CN109780516B - A steam generator with intelligent water level control box heating power - Google Patents

Abstract

The invention provides a steam generator, which comprises a box body and an inner pipe body, wherein the inner pipe body comprises an outer pipe and a core body arranged in the outer pipe; the water enters the box body from the water tank through the water pump; the water level sensor is arranged in the box body, the water level sensor and the electric heater are in data connection with the controller, and the controller automatically controls the heating power of the electric heater according to the measured water level in the box body. The invention controls the power through the water level, thereby avoiding the dry burning of the electric heating device caused by too low water level and the over-large water quantity in the box body caused by too high water level, thereby avoiding the over-low steam output rate.

Description

A steam generator with intelligent water level control box heating power

technical field

The invention relates to the technical field of boilers, in particular to an intelligently controlled steam generator.

Background technique

A steam generator is a mechanical device that uses the thermal energy of fuel or other energy sources to heat water into steam. The steam generator has a wide range of applications and is widely used in garment factories, dry cleaners, restaurants, steamed buns, canteens, restaurants, factories and mines, soy products factories and other places.

Most of the current steam generators are heated by gas or fuel oil, and the heating efficiency is low. Most of the current electric steam generators use electric heating tubes arranged at the bottom of the water storage tank to directly heat the water in the water storage tank to generate steam. This electric steam generator has the problems of slow heating and low thermal efficiency.

For example, Chinese patent document CN2071061U discloses a steam generator for beauty and health care, including a metal electrode plate, a shell made of heat-resistant plastic, a steam outlet cover, an internal baffle, a movable handle, and a metal electrode plate. It must be connected to the power supply through the power cord. There is an internal baffle in the casing, a steam outlet cover at the upper port, and a socket groove on the outside of the bottom of the casing, which can be connected to the movable handle with a socket. Another example is an improved electric heating steam generator disclosed in Chinese patent document CN2651594Y, which is used to generate steam, and includes a main body cavity and an electric heater. The electric heater is placed in the main body cavity, and the main body cavity The upper and lower parts of the cavity are separated, the upper cavity is a steam cavity, the lower cavity is a heating water cavity, and there are steam holes on the partition; The vent holes on the adjacent partition are dislocated. The electric heater heats the water in the heating water chamber, and the steam enters the steam chamber for standby through the partition plate and the transition chamber formed by it. The electric steam generators disclosed in the above two patent documents belong to this type of product.

The steam generator in the prior art has a low degree of intelligent control, uneven heating, low overall steam generation efficiency, and relatively simple heater structure.

SUMMARY OF THE INVENTION

Aiming at the deficiencies in the prior art, the present invention provides a multifunctional steam generator with a novel structure, which can intelligently control the steam generator and provide steam quickly, and the steam generator has the advantages of rapid heating, uniform temperature distribution, safety and reliability. function to improve the heating efficiency.

To achieve the above object, the present invention adopts the following technical solutions:

A steam generator, the steam generator comprises a box body, an inner pipe body, a cold water inlet and a steam outlet, the cold water inlet is arranged on the side wall of the box body, and an exhaust port is arranged on the upper part of the box body, so the The inner pipe body is arranged in the box, the inner pipe body includes an outer pipe and an electric heater arranged in the outer pipe, and a water inlet channel is arranged at the lower part of the inner pipe body to ensure that the water in the box body can enter the inner pipe body for heating, The upper part of the inner pipe body is connected to the steam outlet; the electric heater heats the water entering the outer pipe to generate steam;

The steam generator also includes a steam utilization device. The steam generated by heating in the box enters the steam utilization device through the steam outlet, and is fully heat-exchanged in the steam utilization device before being recycled to the water tank; the water enters the water tank through a water pump. in the box;

A water level sensor is arranged in the box, and the water level sensor and the electric heater are data-connected to the controller, and the controller automatically controls the heating power of the electric heater according to the measured water level in the box.

Preferably, if the water level is too low, the controller will reduce the power of the electric heater or directly turn off the heating of the electric heater; if the water level is too high, increase the heating power of the electric heater 9 to increase the steam output, thereby Lower the water level.

Preferably, when the measured water level is lower than the first water level, the controller controls the electric heater to heat with the first power; when the measured water level is lower than the second water level lower than the first water level, the controller controls the electric heater Heating with a second power lower than the first power; when the measured water level is lower than a third water level lower than the second water level, the controller controls the electric heater to heat with a third power lower than the second power; when When the measured water level is lower than the fourth water level lower than the third water level, the controller controls the electric heater to heat with the fourth power lower than the third power; when the measured water level is lower than the fifth water level lower than the fourth water level When , the controller controls the electric heating device to heat with a fifth power lower than the fourth power; when the measured water level is lower than the sixth water level lower than the fifth water level, the controller controls the electric heating device to stop heating.

Preferably, a core body is arranged in the inner pipe body, the core body is arranged at the upper part of the water inlet channel, and the core body is located in the vertical direction of the inner pipe body; the core body is composed of a square through hole and a regular octagonal through hole , the side length of the square through hole is equal to the side length of the regular octagonal through hole, the four sides of the square through hole are the sides of four different regular octagonal through holes, the four sides of the regular octagonal through hole are respectively The sides spaced from each other are the sides of four different square through holes; the electric heaters are arranged in the square through holes.

Preferably, the electric heater is a resistance heater.

Preferably, the resistive heater fills the entire square channel.

Preferably, the cross section of the inner tube body is square.

Preferably, the inner wall of the inner tube is provided with a groove, and the outer end of the core body is provided in the groove.

Preferably, the inner tube body is welded with a multi-segment structure, and a core body is provided at the joint of the multi-segment structure.

Preferably, the steam outlet is sealed with the outer pipe of the inner pipe body.

Preferably, the cross-sectional area of the steam outlet pipe is smaller than the cross-sectional area of the outer pipe of the inner pipe body.

Preferably, the inner pipe body is arranged in the middle position of the box body.

Preferably, the water inlet channel is a strip-shaped slit.

Preferably, the water inlet channel is set below 50% of the water level of the tank.

Preferably, the electric heater is a resistance heater.

Preferably, the resistive heater fills the entire square channel.

Preferably, a plurality of the core bodies are arranged along the vertical direction, and a water inlet channel is arranged on the outer pipe between two adjacent core bodies.

Preferably, the farther the center of the square through hole is from the center of the core, the greater the heating power of the resistance heater per unit length in the vertical direction.

Preferably, the farther the center of the square through hole is from the center of the core, the larger the heating power of the resistance heater per unit length in the vertical direction is, the greater the magnitude is, the greater the continuous increase.

Preferably, the center of the core body is a regular octagonal channel, the regular quadrilateral channel is a two-layer structure surrounding the core body, the outermost layer is a regular octagonal channel, and the side length of the outer tube is a square channel with 8 times the length side length.

Preferably, the heating power of each electric heater in the first layer is W1, the heating power of each electric heater in the second layer is W2, the height of the core is H, and the side length of the regular quadrilateral is L, then the following requirements are met:

W2/W1=a-b*LN(H/L); where a, b are parameters, 3.3<a<3.4, 0.90<b<0.95;

1.15<W2/W1<1.75; 5.9<H/L<10.1;

The total heating power of the first layer and the second layer is M, 2500W<M<5500W.

Preferably, a=3.343, b=0.921.

The present invention has the following advantages:

1) The present invention controls the power by the water level, which avoids the dry burning of the electric heating device caused by the low water level and the excessive water volume in the box caused by the high water level, thereby causing the steam output rate to be too low.

2) The present invention designs a steam generator with a novel heating structure. Through this structure, steam can be provided quickly, and the steam generator has the functions of rapid heating, uniform temperature distribution, safety and reliability, and improves heating efficiency.

3) The present invention further improves the heating uniformity and heating efficiency by setting the heating power variation of the electric heater in the inner tube from the center of the core.

4) The present invention designs the vertical distribution of the core body in the inner tube, and sets water inlet channels on the separated inner tubes, which can ensure that the water at different positions enters the inner tube in time for heating, which can further improve the heating. efficiency.

5) The present invention designs the variation of the heating power of different electric heaters in the inner tube along the height direction, which can further improve the safety performance and heating performance of the device.

6) The present invention determines the optimal proportional relationship of the electric heating power of different layers through numerical simulation and a large number of experiments, further improves the heating uniformity and heating efficiency, and also provides a design for the inner tube body of this structure. best reference.

7) In the present invention, through numerical simulation and a large number of experiments, the optimal relationship of each size of the core is determined, and the heating uniformity and heating efficiency are further improved.

Description of drawings:

FIG. 1 is a schematic diagram of the preferred structure of the steam generator for generating hot water and steam according to the present invention.

FIG. 2 is a schematic diagram of the preferred structure of the steam generator that only generates steam according to the present invention.

Figure 3 is a schematic view of the cross-sectional structure of the inner tube body (core body).

FIG. 4 is a schematic cross-sectional view of the core body AA in the inner tube of FIG. 3 .

Figure 5 is a schematic view of the longitudinal section of the inner tube body.

In the figure: 1-box body; 2-inner pipe body; 3-cold water inlet; 4-hot water outlet; 5-steam outlet; 6-exhaust outlet;

7-core; 71-regular quadrilateral; 72-regular octagon; 73-side; 8-hole; 9-electric heater; 10-water pump; 11-water tank; 12-controller.

Detailed ways

Figures 1-5 illustrate a steam generator. As shown in FIG. 1 , the steam generator includes a box body 1, an inner pipe body 2, a cold water inlet 3, a hot water outlet 4 and a steam outlet 5. The cold water inlet 3 is arranged at the lower part of the box body 1, and the heat The water outlet 4 is located in the upper part of the tank 1 body. The inner pipe body 2 is arranged in the box, and the inner pipe body 2 is arranged in a vertical direction (perpendicular to the bottom plane of the water tank). The inner pipe body 2 includes an outer pipe and a core body 7 arranged in the outer pipe. The lower part of the pipe body 2 is provided with a water inlet channel 8 to ensure that the water in the box 1 can enter the inner pipe body 2 for heating, and the upper part of the inner pipe body 2 is connected to the steam outlet 5; the core body 7 is arranged on the upper part of the water inlet channel 8, so The core body 7 extends in the vertical direction of the inner tube body 2; the core body 7 is composed of a square through hole 71 and a regular octagonal through hole 72, and the side length of the square through hole is equal to the side of the regular octagonal through hole long, the four sides 73 of the square through hole 71 are respectively the sides of four different regular octagonal through holes 72, and the four mutually spaced sides 73 of the regular octagonal through hole 72 are respectively four different square through holes 72. The side of the hole 71; the electric heater 9 is arranged in the square through hole 71.

In the present invention, a steam generator with a new heating structure is arranged, and the heating structure evenly distributes the electric heaters around a plurality of regular octagonal channels, so that the fluid enters the regular octagonal channels and can be uniformly heated by the electric heaters. With this kind of structure, the steam can be quickly provided by one device, and the steam generator has the functions of rapid heating, uniform temperature distribution, safety and reliability, and the heating efficiency is improved.

Preferably, the steam outlet 5 pipeline is sealed with the outer pipe of the inner pipe body 2 .

Preferably, the cross-sectional area of the pipe of the steam outlet 5 is smaller than the cross-sectional area of the outer pipe of the inner pipe body 2 . This can ensure the steam discharge speed.

Cold water enters the tank through the cold water inlet 3 . When working, the inner pipe body 2 is arranged in the box body 1, the water in the box body 1 enters the inner pipe body 2 through the water inlet channel 8 on the outer pipe, and then the water passes through the inner pipe body in the regular octagonal through hole. The electric heater in the regular quadrilateral through hole of the core body 7 in 2 is heated, and the steam generated after heating is discharged through the steam outlet 5 . At the same time, the inner pipe body heats the water in the box while generating steam, and the hot water generated after heating can be used through the hot water outlet.

Preferably, the regular quadrilateral through holes are closed up and down, and water cannot enter.

Through the above-mentioned structural arrangement, steam and hot water can be generated at the same time, so that the steam generator has multiple functions, and the scope of its utilization is expanded, and the generated steam is directly discharged through the steam outlet connected to the inner pipe body, because the steam generator is discharged through the outer pipe body. The tube is used to heat the water outside the inner tube body, so the external water will not boil and evaporate, which also ensures the safety of heating.

In the present invention, the inner pipe body 2 is arranged in the vertical direction, so that the water can be heated in the vertical direction, so that the water is continuously heated during the rising process, and the heating efficiency is further improved compared with the inner pipe body arranged in the horizontal direction.

Preferably, the outer tube of the inner tube body is the outer wall surface of the core body. Preferably, the inner tube body and the core body are integrally manufactured.

As an improvement, the hot water outlet 4 can be eliminated, for example, as shown in FIG. 2, and only the steam generator is used as a single-function steam generator that generates steam.

Preferably, the upper part of the box body 1 is provided with an exhaust port 6 . By arranging the exhaust port 6, the pressure inside the box body 1 is prevented from being too large, and safety can be ensured.

Preferably, the cross section of the box body 1 is circular.

Preferably, the cross section of the inner tube body 2 is square.

Preferably, the inner pipe body 2 is arranged in the middle position of the box body 1 . By setting in this way, the uniformity of hot water heating is ensured.

Preferably, the side length of the cross-sectional area of the outer tube of the inner tube body 2 is 0.01-0.15 times the cross-sectional area of the box body 1 . More preferably, it is 0.11-0.13 times.

Preferably, the water inlet channel 8 is a strip slit.

Preferably, the water inlet channel 8 is an opening. As shown in Figure 5. It should be noted that FIG. 5 is only a schematic diagram. Although FIG. 5 only shows one or one row of openings, it is not limited to one or one row. Set up multiple or multiple rows at the upper and lower positions of the space.

Preferably, the shape of the opening may be circular or square.

Preferably, the opening is set below 50% of the water level of the box body 1 . By setting in this way, it can be ensured that water can enter the inner pipe body 2 for heating in a timely manner, and at the same time, it is also avoided that the setting of the opening is too high to cause the steam to overflow from the opening, and the pressure in the whole box is prevented from being too high, and the water at the high place is also avoided. Into the inner tube body, causing the steam produced to carry too much moisture.

Preferably, the wire connecting the electric heater 9 enters through the water inlet channel.

Preferably, the wire connecting the electric heater 9 enters the inner tube body 2 through the bottom of the inner tube body 2 .

Preferably, the inner wall of the inner tube body 2 is provided with a groove, and the outer wall surface of the core body 7 is provided in the groove. By setting in this way, the firmness of the core body installation can be further improved.

Preferably, the inner tube body 2 is formed by welding a multi-segment structure, and a core body 7 is provided at the joint of the multi-segment structure. By setting in this way, the processing can be facilitated and the cost can be saved.

Preferably, the electric heater 9 is a resistance heater.

Preferably, the resistive heater 9 fills the entire square channel. This arrangement can ensure that the electric heater is in contact with the wall surface of the square channel, thereby further improving the heating efficiency.

Preferably, a plurality of the core bodies 7 are arranged at intervals along the vertical direction, and a water inlet channel is provided on the outer tube spaced between two adjacent core bodies 7 . The invention designs the vertical distribution of the core bodies in the inner tube body, and sets the water inlet channels on the inner tube bodies at intervals, which can ensure that the water at different positions enters the inner tube for heating in time, and can further improve the heating efficiency .

Preferably, the farther the center of the square through hole is from the center of the core 7, the greater the heating power of the resistance heater per unit length in the vertical direction. For example, in FIG. 3 , the heating power of the first layer is lower than that of the second layer, but the heating power of the second layer is also different. Specifically, the heating power of the four top corners is greater than the heating power of the non-vertical corners. Through vertical simulations and experiments, it is found that the farther from the center, the larger the area involved in heating, the more heating power is required, especially in the outermost layer, because the water outside the inner tube body is also heated, so it is necessary to The heating power per unit length in the vertical direction is greater. The present invention further improves the heating uniformity and heating efficiency by setting the heating power variation between the electric heater in the inner tube and the center of the core.

Preferably, the farther the center of the square through hole is from the center of the core body 7 , the higher the heating power of the resistance heater per unit length in the vertical direction is, the greater the magnitude is, the greater the continuous increase. The above-mentioned changes in the heating amplitude are also obtained through a large number of numerical simulations and experiments, which are not common knowledge in the art. By changing the above range, the heating efficiency and the heating uniformity can be further improved.

Preferably, the core body 7 is a regular octagonal central core body, and the regular octagonal through hole is located in the center of the core body. As shown in Figure 3.

Further preferably, the center of the core body 7 is a regular octagonal channel, the regular quadrilateral channel is a two-layer structure surrounding the core body, the outermost layer is a regular octagonal channel, and the side length of the outer tube is 8 times the regular octagonal channel. The side length of the edge-shaped via.

Through a large number of numerical simulations and experiments, it can be known that the heating power requirements of different layers of electric heaters are different to achieve the purpose of uniform heating. The longer the side of the regular quadrilateral, the larger the volume to be heated and the larger the external space. The larger the heating power ratio of the inner and outer layers is required; and the longer the length of the core body in the vertical direction, the larger the heating area on the overall length, the more uniform the heating distribution, resulting in the heating of the inner and outer layers. The smaller the power ratio requirement. Therefore, the present invention conducts a lot of research on the heating power, side length and height of each layer through a large number of vertical simulations and experiments, and obtains the optimal heating power relationship. For the above-mentioned structure of Figure 3, the ratio of the heating power of the outermost layer to the heating power of the innermost layer meets the following requirements:

Preferably, the heating power of each electric heater in the first layer is W1, the heating power of each electric heater in the second layer is W2, the height of the core is H, and the side length of the regular quadrilateral is L, then the following requirements are met:

W2/W1=a-b*LN(H/L); where a, b are parameters, 3.3<a<3.4, 0.90<b<0.95;

1.15<W2/W1<1.75; 5.9<H/L<10.1;

The total heating power of the first layer and the second layer is M, 2500w<M<5500W.

Preferably, a=3.343, b=0.921.

As a preference, 1.3<W2/W1<1.5; 7.1<H/L<8.1;

The first and second layers are the inner and outer layers, respectively.

Preferably, as H/L increases, a decreases gradually and b increases gradually. By setting in this way, the heating can be made more uniform, and the heating efficiency can be improved.

Preferably, along the vertical direction from bottom to top, the pipe diameter of the inner pipe body 2 is continuously increased. The main reasons are as follows: 1) By increasing the pipe diameter of the inner pipe body 2, the resistance to the upward flow of steam can be reduced, so that the vapor evaporated in the inner pipe body 2 continuously moves in the direction of increasing pipe diameter, thereby further promoting the rise of steam. 2) With the continuous flow of the fluid, the liquid is continuously evaporated in the inner tube body 2, so that the volume of the gas body is getting bigger and bigger, and the pressure is also getting bigger and bigger, so the pipe diameter is increased to meet the increasing steam volume. Changes in body volume and pressure, so that the overall pressure distribution is uniform.

Preferably, along the vertical direction from the bottom to the top, the diameter of the inner pipe body 2 is continuously increased with an increasing range. The above-mentioned amplitude change of the pipe diameter is the result obtained by the applicant through a large number of experiments and numerical simulations. Through the above-mentioned settings, the steam flow can be further promoted, and the overall pressure can be uniform.

Preferably, a plurality of core bodies 7 are arranged in the inner tube body 2 , and the distance between the core bodies 7 is larger from the bottom end of the inner tube body 2 to the upper end of the inner tube body 2 . Let the distance from the bottom end of the inner tube body 2 be H, the distance between adjacent cores be S, S=F ₁ (H), that is, S is a function of the distance H as a variable, S' is the first derivative of S, Meet the following requirements:

S'>0;

The main reason is to avoid drying out caused by the overheating of the upper steam. By setting the heating power of the lower part to be greater than the heating power of the upper part, the water can be fully heated in the lower part, and the water in the upper part is reheated during the rising process. The water in the upper part evaporates first, which is caused by heating and drying. Therefore, the distance between adjacent cores that need to be arranged is getting shorter and shorter.

Through experiments, it is found that, through the above setting, the overall uniformity of heating can be maintained to the greatest extent, and the heating effect can be improved at the same time.

Further preferably, from the inlet of the inner tube body 2 to the outlet of the inner tube body 2, the distance between the adjacent core bodies is continuously increased to a larger and larger extent. That is, S" is the second derivative of S, which meets the following requirements:

S”>0;

It has been found through experiments that by setting in this way, the overall uniformity of heating can be further maintained, and the heating effect can be improved at the same time. It should be noted that the above rules are obtained by the applicant through a large number of experiments and numerical simulations, and are not common knowledge or conventional means in the field.

Preferably, a plurality of core bodies are arranged in the inner tube body 2. From the bottom end of the inner tube body 2 to the upper end of the inner tube body 2, the heating power of the electric heaters arranged in each regular quadrilateral of different core bodies gradually decreases . Let the distance from the bottom end of the inner tube body 2 be H, the electric heater power arranged in each regular quadrilateral of the adjacent core body is W, S=F ₃ (H), that is, W is a function of the distance H as a variable, W' is the first derivative of W, which satisfies the following requirements:

W'<0;

The main reason is to avoid drying out caused by the overheating of the upper steam. By setting the heating power of the lower part to be greater than the heating power of the upper part, the water can be fully heated in the lower part, and the water in the upper part is reheated during the rising process. The water in the upper part evaporates first, which is caused by heating and drying. Therefore, the distance between adjacent cores that need to be arranged is getting shorter and shorter.

Through experiments, it is found that, through the above setting, the overall uniformity of heating can be maintained to the greatest extent, and the heating effect can be improved at the same time.

Further preferably, from the inlet of the inner tube body 2 to the outlet of the inner tube body 2, the power of the electric heaters arranged in each regular quadrilateral of the adjacent core bodies decreases continuously and increases continuously. That is, W" is the second derivative of S, which meets the following requirements:

w” > 0;

It has been found through experiments that by setting in this way, the overall uniformity of heating can be further maintained, and the heating effect can be improved at the same time. It should be noted that the above rules are obtained by the applicant through a large number of experiments and numerical simulations, and are not common knowledge or conventional means in the field.

Preferably, a plurality of core bodies are arranged in the inner tube body 2 , and from the bottom end of the inner tube body 2 to the upper end of the inner tube body 2 , the side length of the square is getting smaller and smaller. The distance from the entrance of the inner pipe body 2 is H, the side length of the square is C, C=F ₂ (H), and C' is the first derivative of C, which meets the following requirements:

C'<0;

The main reason is because the smaller the side of the square, the more difficult it is to manufacture, but the better the overall heating uniformity. Because the further to the upper part, the overall heating of the water should be kept uniform to avoid partial drying out caused by uneven heating, and the further to the upper part, because the steam has to go out through the outlet, the more the uniformity of steam outgassing and heating should be strengthened. With the above arrangement, costs can be saved, and the best heating uniformity and steam production efficiency can be achieved, while drying out is avoided.

Further preferably, from the inlet of the inner tube body 2 to the outlet of the inner tube body 2, the side lengths of the square are getting smaller and smaller and the amplitude is continuously increasing. C" is the second derivative of C, which satisfies the following requirements:

C”>0.

Preferably, the distance between adjacent cores remains unchanged.

It has been found through experiments that by setting in this way, the overall uniformity of heating can be further maintained, and the heating effect can be improved at the same time. It should be noted that the above rules are obtained by the applicant through a large number of experiments and numerical simulations, and are not common knowledge or conventional means in the field.

Preferably, the farther the center of the square through hole is from the center of the core, the greater the heating power of the resistance heater per unit length in the vertical direction.

Because it can be known from experiments and numerical simulations that the more outward, the larger the volume that needs to be heated, especially the outermost, which needs to heat the surrounding water and the water in the inner tube. The present invention further improves the heating uniformity and heating efficiency by setting the heating power variation between the electric heater in the inner tube and the center of the core.

Preferably, the farther the square through hole is from the center of the core, the higher the heating power of the resistance heater per unit length in the vertical direction is continuously increasing. Through such regular setting, the heating uniformity and heating efficiency are further improved.

Preferably, the openings are arranged in multiple rows along the height direction (that is, from the bottom to the top, if there is no special description along the height direction, it refers to the direction from the bottom to the top).

By setting up multiple rows, it can ensure that water enters at different heights, avoid water entering at a single position, resulting in uneven heating, and at the same time prevent the entering water from being evaporated, causing the heating tube to dry up.

Preferably, along the height direction, the distribution density of the openings becomes smaller and smaller. The density of the distribution of openings is getting smaller and smaller, which means that the distribution of openings is less and less, and the area of the openings is also smaller and smaller.

Through a large number of numerical simulations and experimental studies, it is found that the distribution density of the openings is getting smaller and smaller, the main reason is to ensure that most of the water is heated at the bottom, and water continuously enters the inner pipe body 2 when the water turns into steam and rises. , continue heating. If there is less water in the lower part, it may cause the water in the lower part to vaporize rapidly, resulting in excessive pressure in the inner pipe body 2, so that the water in the upper part cannot enter the inner pipe body due to the pressure. The drying of the inner tube body is reduced, and the heating efficiency is improved at the same time.

Further preferably, along the height direction, the distribution density of the openings becomes smaller and smaller and increases continuously.

After a large number of experiments and numerical simulations, through the above-mentioned changes in the distribution density of the openings, the heating efficiency can be further improved, the steam output efficiency can be improved, and the dry-up in the inner tube can be reduced at the same time.

Preferably, along the height direction, the area of a single opening becomes smaller and smaller. Further preferably, along the height direction, the area of a single opening is smaller and smaller and the range is continuously increased. For specific reasons, see the change in the distribution density of open pores.

Preferably, along the height direction, the sum of the areas of the openings in each row becomes smaller and smaller. Preferably, along the height direction, the sum of the areas of the openings in each row becomes smaller and smaller and continuously increases. For specific reasons, see the change in the distribution density of open pores.

Preferably, along the height direction, the spacing between the openings in each row becomes larger and larger. Preferably, along the height direction, the spacing between the openings in each row increases continuously. For specific reasons, see the change in the distribution density of open pores.

Preferably, along the height direction, the heating power per unit length of the electric heating rod 9 is continuously reduced. By setting the heating power of the electric heating rod 9 to be continuously reduced, the fluid in the lower part is rapidly heated, and then the hot fluid flows to the upper part through natural convection, and the fluid in the upper part and the fluid outside the inner tube body 2 in the lower part enter quickly, which can further improve the heating efficiency. After a large number of experiments and numerical simulations, through the above-mentioned changes in the heating power of the inner tube body, the heating efficiency can be further improved by about 10%, and the heating time can be saved.

Preferably, along the height direction, the heating power per unit length of the electric heating rod 9 is continuously reduced and the range is continuously increased.

After a large number of experiments and numerical simulations, through the above-mentioned change of the heating power range of the electric heating rod 9, the heating efficiency can be further improved by 5%, and the heating time can be further saved.

Preferably, the same electric heating rod 9 in the same core is divided into multiple sections, and along the height direction, the heating power per unit length of different sections is different. Among them, along the height direction, the heating power per unit length of different segments is continuously reduced. Further preferably, the magnitude of the reduction is continuously increased.

Preferably, each segment is the same length.

Preferably, the heating power per unit length of each segment is the same.

The specific reasons are as above.

By arranging the segments, it is possible to further simplify and facilitate the manufacture.

Through analysis and experiments, it is known that the distance between the cores in the vertical direction should not be too large. If it is too large, the effect of steam generation will not be good. At the same time, it should not be too small. If it is too small, it will cause the inner tube to dry easily. The side length of the square can not be too large or too small, too large will lead to uneven heating, too small will lead to too dense distribution of regular quadrilaterals and octagons, resulting in increased flow resistance and increased processing costs. Therefore, through a large number of experiments, the present invention optimizes the resistance under the condition of preferentially satisfying the steam output, and sorts out the best relationship of each parameter.

Preferably, the distance between adjacent cores is S1, the side length of the square is L, the core is a square section, and the side length of the square section of the core is B2, which meets the following requirements:

10*L/B2=a-b*(S1/B2);

Where a, b are parameters, where 0.95<a<0.96, 0.158<b<0.165;

90<B2<240mm;

8<L<30mm;

29<S1<110mm.

Further preferred, a=0.956, b=0.163;

Further preferably, as L/B2 increases, a becomes larger and b becomes smaller.

Preferably, the side length L of the square through hole is the average value of the inner side length and the outer side length of the square through hole, and the side length B2 of the square section of the core body is the average value of the inner side length and the outer side length of the square section of the core body.

The distance S1 between adjacent cores is the distance between the opposing faces of the adjacent cores. For example, the distance between the upper end surface of the lower core and the lower end surface of the upper core.

Preferably, as B2 increases, L also increases. But with the increase of B2, the continuous increase of L becomes smaller and smaller. The change of this law is obtained through a large number of numerical simulations and experiments. Through the change of the above law, the heat exchange effect can be further improved and the noise can be reduced.

Preferably, as B2 increases, S1 decreases continuously. But with the increase of B2, the magnitude of S1's continuous decrease becomes smaller and smaller. The change of this law is obtained through a large number of numerical simulations and experiments. Through the change of the above law, the heat exchange effect can be further improved and the noise can be reduced.

The core height H is preferably 100 to 500 mm, and more preferably 200 to 300 mm.

The invention also includes a steam utilization device. The steam generated by heating in the steam generator 1 enters the steam utilization device through the steam outlet 5, and is fully heat-exchanged in the steam utilization device before being recycled to the water tank; the water passes through the water tank 11. The water pump 10 enters the box, and is heated by the electric heater 9 in the box, and the generated steam enters the steam utilization device through the steam outlet pipeline 5 .

The present invention can realize the following control:

(1) Temperature control

Preferably, a temperature sensor is provided in the steam outlet 5 for measuring the temperature of the steam in the steam outlet 5 . The temperature sensor and the electric heater 9 are data-connected to the controller 12, and the controller 12 automatically controls the heating power of the electric heater 9 according to the temperature measured by the temperature sensor.

Preferably, if the temperature measured by the temperature sensor is lower than a certain temperature, the controller controls the electric heating device to increase the heating power. If the temperature measured by the temperature sensor is higher than a certain temperature, in order to avoid heat waste, the controller controls the electric heating device to reduce the heating power.

By controlling the heating power, the outlet temperature can be guaranteed to meet the requirements, so as to prevent the outlet temperature from being too high, resulting in heat loss, and the outlet temperature being too low, resulting in the heat not meeting the actual requirements.

Preferably, if the detected temperature data is lower than the first value, the controller 12 automatically increases the heating power of the electric heater 9, and if the measured temperature data is higher than the second value, the controller 12 automatically reduces the heating power of the electric heater 9 power, the second value is greater than the first value.

Preferably, when the measured temperature is lower than the first temperature, the electric heater 9 is heated with the first power; when the measured temperature is lower than the second temperature lower than the first temperature, the electric heater 9 is heated at a higher power than the first temperature. The second power of one power is used for heating; when the measured temperature is lower than the third temperature lower than the second temperature, the electric heater 9 is heated with the third power higher than the second power; when the measured temperature is lower than the ratio When the third temperature is lower than the fourth temperature, the electric heater 9 heats with the fourth power higher than the third power; when the measured temperature is lower than the fifth temperature lower than the fourth temperature, the electric heater 9 heats with the high power Heating is performed at the fifth power of the fourth power.

Preferably, the first temperature is 2-3 degrees Celsius higher than the second temperature, the second temperature is 2-3 degrees Celsius higher than the third temperature, the third temperature is 2-3 degrees Celsius higher than the fourth temperature, and the fourth temperature is 2-3 degrees Celsius higher than the fifth temperature .

Further preferably, the first temperature is 2.5-3 degrees Celsius higher than the second temperature, the second temperature is 2.5 degrees Celsius higher than the third temperature, the third temperature is 2.5 degrees Celsius higher than the fourth temperature, and the fourth temperature is 2.5 degrees Celsius higher than the fifth temperature.

Preferably, the fifth power is 1.08-1.18 times the fourth power, the fourth power is 1.08-1.18 times the third power, the third power is 1.08-1.18 times the second power, and the second power is the first power 1.08-1.18 times.

Preferably, the fifth power is 1.14 times the fourth power, the fourth power is 1.14 times the third power, the third power is 1.14 times the second power, and the second power is 1.14 times the first power.

Through the above optimization of temperature and power, especially through the setting of differential heating power and temperature difference, the heating efficiency can be further improved and time can be saved. It is found through experiments that the heating efficiency can be improved by about 12%.

Preferably, there are multiple temperature sensors, and the temperature data based on the controller is the temperature measured by the multiple temperature sensors to control the operation of the steam generator.

(2) Water level control

Preferably, a water level sensor is provided in the box, and the water level sensor, the electric heater 9, and the water pump 10 are connected with the controller 12, and the controller 12 automatically controls the power of the water pump 10 according to the measured water level in the box.

Preferably, if the water level drops, the controller increases the flow of water entering the steam generator by increasing the power of the water pump 10, and if the water level is too high, reduces the water entering the tank by reducing the power of the water pump 10 or turning off the water pump 10 flow or stop water supply to the tank.

Through the above arrangement, on the one hand, the low steam output rate and the dry burning of the electric heating device caused by the low water level are avoided, causing damage to the electric heating device and safety accidents. The resulting water volume is too high, resulting in too low steam yield.

Preferably, when the measured water level is lower than the first water level, the controller 12 controls the water pump 10 to deliver water with the first power; when the measured water level is lower than the second water level lower than the first water level, the controller 12 controls the water pump 10 10 to deliver water with a second power higher than the first power; when the measured water level is lower than a third water level lower than the second water level, the controller 12 controls the water pump 10 to deliver water with a third power higher than the second power. water; when the measured water level is lower than the fourth water level lower than the third water level, the controller 12 controls the water pump 10 to deliver water with a fourth power higher than the third power; when the measured water level is lower than the fourth water level At the fifth water level, the controller 12 controls the water pump 10 to deliver water at a fifth power higher than the fourth power.

Preferably, the first water level is 1.08-1.18 times the second water level, the second water level is 1.08-1.18 times the third water level, the third water level is 1.08-1.18 times the fourth water level, and the fourth water level is the fifth water level 1.08-1.18 times.

Preferably, the first water level is 1.1-1.15 times the second water level, the second water level is 1.15-1.2 times the third water level, the third water level is 1.2-1.25 times the fourth water level, and the fourth water level is the fifth water level 1.25-1.3 times.

Preferably, the fifth power is 1.7-1.9 times the fourth power, the fourth power is 1.6-1.8 times the third power, the third power is 1.5-1.7 times the second power, and the second power is the first power 1.3-1.5 times.

Through the above-mentioned optimization of water level and pump power, especially through the setting of differentiated water level and pump power, the constant water level can be quickly achieved, the steam output rate can be improved, and time can be saved. It is found through experiments that the steam output can be increased by about 12-16%.

(3) Control of heating power according to water level

Preferably, a water level sensor is provided in the box, and the water level sensor and the electric heater 9 are data-connected to the controller 12, and the controller 12 automatically controls the heating power of the electric heater according to the measured water level in the box.

Preferably, if the water level is too low, the controller will control to reduce the power of the electric heater 9 or directly turn off the heating of the electric heater 9, so as to avoid excessive steam output caused by too high heating power, resulting in further reduction of the water level , if the water level is too high, increase the heating power of the electric heater 9 to increase the steam output, thereby lowering the water level.

Through the above arrangement, on the one hand, it avoids the dry burning of the electric heating device caused by the low water level, causing damage to the electric heating device and causing safety accidents; , resulting in low steam yield.

Preferably, when the measured water level is lower than the first water level, the controller 12 controls the electric heater 9 to heat with the first power; when the measured water level is lower than the second water level lower than the first water level, the controller 12 controls The electric heater 9 is heated with a second power lower than the first power; when the measured water level is lower than a third water level lower than the second water level, the controller 12 controls the electric heater 9 to heat at a second power lower than the second power. Three powers are used for heating; when the measured water level is lower than the fourth water level lower than the third water level, the controller 12 controls the electric heater 9 to heat with the fourth power lower than the third power; when the measured water level is lower than the ratio When the fourth water level is lower than the fifth water level, the controller 12 controls the electric heating device to perform heating with a fifth power lower than the fourth power; when the measured water level is lower than the sixth water level lower than the fifth water level, the controller 12 Control the electric heating device to stop heating.

Preferably, the first water level is 1.08-1.18 times the second water level, the second water level is 1.08-1.18 times the third water level, the third water level is 1.08-1.18 times the fourth water level, and the fourth water level is the fifth water level 1.08-1.18 times.

Preferably, the first water level is 1.1-1.15 times the second water level, the second water level is 1.15-1.2 times the third water level, the third water level is 1.2-1.25 times the fourth water level, and the fourth water level is the fifth water level 1.25-1.3 times.

Preferably, the first power is 1.6-1.7 times the second power, the second power is 1.5-1.6 times the third power, the third power is 1.4-1.5 times the fourth power, and the fourth power is the fifth power 1.3-1.4 times.

Through the above-mentioned optimization of the water level and the power of the electric heating device, especially through the setting of the differentiated water level and the power of the electric heating device, the water level can be quickly achieved at a predetermined safe position, and the steam can be guaranteed when the water level is too high. Productivity, time saving.

(4) Pressure control

Preferably, a pressure sensor is provided on the steam outlet 5 for measuring the pressure in the steam outlet 5 . The pressure sensor and the electric heater 9 are in data connection with the controller 12, and the controller 12 automatically controls the heating power of the electric heater 9 according to the pressure measured by the pressure sensor.

Preferably, if the pressure measured by the pressure sensor is lower than a certain pressure, the controller 12 controls the electric heater 9 to start heating. If the temperature measured by the pressure sensor is higher than the upper limit pressure, in order to avoid the danger of excessive pressure, the controller controls the electric heater 9 to stop heating.

With this arrangement, the heating power can be adjusted according to the pressure of the steam outlet 5, so as to ensure that the heat exchange of the steam utilization device meets the requirements, and at the same time, the safety of the steam generator is ensured under the condition of maximizing the steam output.

Preferably, if the pressure measured by the pressure sensor is lower than a certain value, the controller 12 controls the electric heater 9 to increase the heating power. If the temperature measured by the pressure sensor is higher than a certain value, in order to avoid danger caused by excessive pressure, the controller controls the electric heater 9 to reduce the heating power.

Preferably, when the measured pressure is higher than the first pressure, the controller 12 controls the heating power of the electric heater 9 to reduce to the first power for heating; when the measured pressure is higher than the second pressure higher than the first pressure, The controller 12 controls the heating power of the electric heater 9 to reduce to a second power lower than the first power for heating; when the measured pressure is higher than a third pressure higher than the second pressure, the controller 12 controls the electric heater 9 The heating power of the electric heater 9 is reduced to a third power lower than the second power for heating; when the measured pressure is higher than the fourth pressure higher than the third pressure, the controller 12 controls the heating power of the electric heater 9 to be reduced to a lower power than the third pressure. The fourth power with high power performs heating; when the measured pressure is higher than the fifth pressure higher than the fourth pressure, the controller 12 stops the heating of the electric heater 9 .

Preferably, the fourth power is 0.4-0.6 times the third power, the third power is 0.6-0.8 times the second power, and the second power is 0.7-0.9 times the first power.

Further preferably, preferably, the fourth power is 0.5 times the third power, the third power is 0.7 times the second power, and the second power is 0.8 times the first power.

The fifth pressure is the upper limit pressure.

Preferably, there are multiple pressure sensors, and the pressure data based on the controller is the temperature measured by the multiple pressure sensors to control the operation of the steam generator.

(5) Steam flow control

Preferably, a flow sensor is provided on the steam outlet 5 for measuring the flow of steam entering the steam utilization device per unit time, and the flow sensor and the electric heater 9 are connected with the controller 12 for data. The controller 12 automatically controls the power of the electric heater according to the measured steam flow.

Preferably, if the measured steam flow rate is lower than a certain value, the controller 12 controls the electric heater 9 to increase the heating power. If the temperature measured by the pressure sensor is higher than a certain value, the controller controls the electric heater 9 to reduce the heating power.

By setting in this way, the heating power can be adjusted according to the quantity of the output steam, so as to ensure the constant quantity of the output steam, and avoid the quantity being too large or too small, resulting in insufficient or wasteful quantity of the steam.

Preferably, when the measured flow rate is higher than the first flow rate, the controller 12 controls the heating power of the electric heater 9 to reduce to the first power for heating; when the measured flow rate is higher than the second flow rate higher than the first flow rate, The controller 12 controls the heating power of the electric heater 9 to reduce to a second power lower than the first power for heating; when the measured flow rate is higher than the third flow rate higher than the second flow rate, the controller 12 controls the electric heater 9 The heating power of the electric heater 9 is reduced to a third power lower than the second power for heating; when the measured flow rate is higher than the fourth flow rate higher than the third flow rate, the controller 12 controls the heating power of the electric heater 9 to be reduced to a lower power than the third flow rate. The fourth power with higher power performs heating; when the measured flow rate is higher than the fifth flow rate higher than the fourth flow rate, the controller 12 stops the heating of the electric heater 9 .

Preferably, the fourth power is 0.4-0.6 times the third power, the third power is 0.6-0.8 times the second power, and the second power is 0.7-0.9 times the first power.

Further preferably, preferably, the fourth power is 0.5 times the third power, the third power is 0.7 times the second power, and the second power is 0.8 times the first power.

Further preferably, the fifth flow is 1.1-1.2 times the fourth flow, the fourth flow is 1.2-1.3 times the third flow, the third flow is 1.3-1.4 times the second flow, and the second flow is the first flow 1.4-1.5 times.

Through the above optimization of the flow rate and the power of the electric heating device, especially the setting of the differentiated flow rate and the power of the electric heating device, the constant flow rate can be quickly realized and time is saved.

(6) Temperature control of water outlet pipeline

Preferably, a temperature sensor is provided on the hot water outlet 4 for measuring the temperature of the output hot water, and the temperature sensor and the electric heater 9 are connected with the controller 12 for data. The controller 12 automatically controls the heating power of the electric heater according to the temperature measured by the temperature sensor. By controlling the heating power, it is ensured that the temperature after heating meets the requirements, and the water temperature is too high, causing heat loss, and the water temperature is too low, causing the heat to not meet the actual requirements.

Preferably, if the temperature measured by the temperature sensor is lower than a certain temperature, the controller controls the electric heating device to increase the heating power. If the temperature measured by the temperature sensor is higher than a certain temperature, for example, heat waste is caused, in order to avoid heat waste, the controller controls the electric heating device to reduce heating. By reducing the heating power, the steam output is low, so that waste is avoided.

Preferably, if the detected temperature data is lower than the first value, the controller 12 automatically increases the heating power of the electric heater 9, and if the measured temperature data is higher than the second value, the controller 12 automatically reduces the heating power of the electric heater 9 power, the second value is greater than the first value.

Preferably, when the measured temperature is lower than the first temperature, the electric heater 9 is heated with the first power; when the measured temperature is lower than the second temperature lower than the first temperature, the electric heater 9 is heated at a higher power than the first temperature. The second power of one power is used for heating; when the measured temperature is lower than the third temperature lower than the second temperature, the electric heater 9 is heated with the third power higher than the second power; when the measured temperature is lower than the ratio When the third temperature is lower than the fourth temperature, the electric heater 9 heats with the fourth power higher than the third power; when the measured temperature is lower than the fifth temperature lower than the fourth temperature, the electric heater 9 heats with the high power Heating is performed at the fifth power of the fourth power.

Preferably, the first temperature is 2-3 degrees Celsius higher than the second temperature, the second temperature is 2-3 degrees Celsius higher than the third temperature, the third temperature is 2-3 degrees Celsius higher than the fourth temperature, and the fourth temperature is 2-3 degrees Celsius higher than the fifth temperature .

Further preferably, the first temperature is 2.5 degrees Celsius higher than the second temperature, the second temperature is 2.5 degrees Celsius higher than the third temperature, the third temperature is 2.5 degrees Celsius higher than the fourth temperature, and the fourth temperature is 2.5 degrees Celsius higher than the fifth temperature.

Preferably, the fifth power is 1.08-1.18 times the fourth power, the fourth power is 1.08-1.18 times the third power, the third power is 1.08-1.18 times the second power, and the second power is the first power 1.08-1.18 times.

Preferably, the fifth power is 1.14 times the fourth power, the fourth power is 1.14 times the third power, the third power is 1.14 times the second power, and the second power is 1.14 times the first power.

Through the above optimization of temperature and power, especially through the setting of differential heating power and temperature difference, the heating efficiency can be further improved and time can be saved. Through experiments, it was found that the heating efficiency can be improved by about 11%.

Preferably, there are multiple temperature sensors, and the temperature data based on the controller is the temperature measured by the multiple temperature sensors 12 to control the operation of the system.

(7) Temperature control of steam generator

Preferably, a temperature sensor is provided in the box for measuring the temperature of the steam in the box. The temperature sensor and the electric heater 9 are data-connected to the controller 12, and the controller 12 automatically controls the heating power of the electric heater 9 according to the temperature measured by the temperature sensor.

The temperature sensor is preferably arranged in the inner tube in an upper position.

Preferably, if the temperature measured by the temperature sensor is lower than a certain temperature, the controller controls the electric heating device to increase the heating power. If the temperature measured by the temperature sensor is higher than a certain temperature, for example, higher than a dangerous critical temperature, the controller controls the electric heating device to stop heating in order to avoid overheating.

Preferably, if the detected temperature data is lower than the first value, the controller 12 automatically increases the heating power of the electric heater 9, and if the measured temperature data is higher than the second value, the controller 12 automatically reduces the heating power of the electric heater 9 power, the second value is greater than the first value.

Preferably, when the measured temperature is lower than the first temperature, the electric heater 9 is heated with the first power; when the measured temperature is lower than the second temperature lower than the first temperature, the electric heater 9 is heated at a higher power than the first temperature. The second power of one power is used for heating; when the measured temperature is lower than the third temperature lower than the second temperature, the electric heater 9 is heated with the third power higher than the second power; when the measured temperature is lower than the ratio When the third temperature is lower than the fourth temperature, the electric heater 9 heats with the fourth power higher than the third power; when the measured temperature is lower than the fifth temperature lower than the fourth temperature, the electric heater 9 heats with the high power Heating is performed at the fifth power of the fourth power.

Preferably, the first temperature is 2-3 degrees Celsius higher than the second temperature, the second temperature is 2-3 degrees Celsius higher than the third temperature, the third temperature is 2-3 degrees Celsius higher than the fourth temperature, and the fourth temperature is 2-3 degrees Celsius higher than the fifth temperature .

Further preferably, the first temperature is 2.5 degrees Celsius higher than the second temperature, the second temperature is 2.5 degrees Celsius higher than the third temperature, the third temperature is 2.5 degrees Celsius higher than the fourth temperature, and the fourth temperature is 2.5 degrees Celsius higher than the fifth temperature.

Preferably, the fifth power is 1.08-1.18 times the fourth power, the fourth power is 1.08-1.18 times the third power, the third power is 1.08-1.18 times the second power, and the second power is the first power 1.08-1.18 times.

Preferably, the fifth power is 1.14 times the fourth power, the fourth power is 1.14 times the third power, the third power is 1.14 times the second power, and the second power is 1.14 times the first power.

Through the above optimization of temperature and power, especially through the setting of differential heating power and temperature difference, the heating efficiency can be further improved and time can be saved. It is found through experiments that the heating efficiency can be improved by about 10-15%.

Preferably, the temperature sensor is arranged in the inner tube of the steam generator.

Preferably, there are multiple temperature sensors, and the temperature data based on the controller is the temperatures measured by the multiple temperature sensors 12 to control the operation of the steam generator.

(8) Steam generator pressure control

Preferably, a pressure sensor is arranged in the box for measuring the pressure of the steam in the box. The pressure sensor and the electric heater 9 are in data connection with the controller 12, and the controller 12 automatically controls the heating power of the electric heater 9 according to the pressure measured by the pressure sensor.

The pressure sensor is preferably arranged in the inner tube in an upper position.

Preferably, if the pressure measured by the pressure sensor is lower than a certain pressure, the controller controls the electric heating device to increase the heating power. If the pressure measured by the pressure sensor is higher than a certain pressure, for example, higher than a dangerous critical pressure, the controller controls the electric heating device to stop heating in order to avoid overheating.

Preferably, if the detected pressure data is lower than the first value, the controller 12 automatically increases the heating power of the electric heater 9, and if the measured pressure data is higher than the second value, the controller 12 automatically reduces the heating power of the electric heater 9 power, the second value is greater than the first value.

Preferably, when the measured pressure is lower than the first pressure, the electric heater 9 heats with the first power; when the measured pressure is lower than the second pressure lower than the first pressure, the electric heater 9 heats with the first power higher than the first pressure. The second power of one power is used for heating; when the measured pressure is lower than the third pressure lower than the second pressure, the electric heater 9 is heated with the third power higher than the second power; when the measured pressure is lower than the ratio When the third pressure is lower than the fourth pressure, the electric heater 9 heats with the fourth power higher than the third power; when the measured pressure is lower than the fifth pressure lower than the fourth pressure, the electric heater 9 heats with the high power Heating is performed at the fifth power of the fourth power.

Preferably, the fifth power is 1.08-1.18 times the fourth power, the fourth power is 1.08-1.18 times the third power, the third power is 1.08-1.18 times the second power, and the second power is the first power 1.08-1.18 times.

Preferably, the fifth power is 1.14 times the fourth power, the fourth power is 1.14 times the third power, the third power is 1.14 times the second power, and the second power is 1.14 times the first power.

Through the above optimization of pressure and power, especially through the setting of differential heating power and temperature difference, the heating efficiency can be further improved and time can be saved. It is found through experiments that the heating efficiency can be improved by about 10-15%.

Preferably, the pressure sensor is arranged in the inner tube of the steam generator.

Preferably, there are multiple pressure sensors, and the pressure data based on the controller is the pressure measured by the multiple pressure sensors 12 to control the operation of the steam generator.

Although the present invention has been disclosed above with preferred embodiments, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (5)

1. A steam generator comprises a box body, an inner pipe body, a cold water inlet and a steam outlet, wherein the cold water inlet is formed in the side wall of the box body, an exhaust port is formed in the upper portion of the box body, the inner pipe body is arranged in the box body, the inner pipe body comprises an outer pipe and an electric heater arranged in the outer pipe, a water inlet channel is formed in the lower portion of the inner pipe body, water in the box body can enter the inner pipe body to be heated, and the upper portion of the inner pipe body is connected with the steam outlet; the electric heater heats water entering the outer pipe to generate steam;

the steam generator also comprises a steam utilization device, steam generated by heating in the box body enters the steam utilization device through a steam outlet, and is recycled to the water tank after being fully subjected to heat exchange and utilization in the steam utilization device; the water enters the box body from the water tank through the water pump;

a water level sensor is arranged in the box body, the water level sensor and the electric heater are in data connection with a controller, and the controller automatically controls the heating power of the electric heater according to the measured water level in the box body;

a core body is arranged in the inner pipe body, the core body is arranged at the upper part of the water inlet channel, and the core body extends in the vertical direction of the inner pipe body; the core body is composed of a square through hole and a regular octagonal through hole, the side length of the square through hole is equal to that of the regular octagonal through hole, four sides of the square through hole are respectively sides of four different regular octagonal through holes, and four mutually spaced sides of the regular octagonal through hole are respectively sides of four different square through holes; the electric heater is arranged in the square through hole.

2. The steam generator of claim 1, wherein if the water level is too low, the controller reduces the power of the electric heater or directly turns off the heating of the electric heater by controlling; if the water level is too high, the steam production is increased by increasing the heating power of the electric heater (9), thereby lowering the water level.

3. The steam generator of claim 1, wherein the controller controls the electric heater to heat at a first power when the measured water level is lower than a first water level; when the measured water level is lower than a second water level lower than the first water level, the controller controls the electric heater to heat at a second power lower than the first power; when the measured water level is lower than a third water level lower than the second water level, the controller controls the electric heater to heat at a third power lower than the second power; when the measured water level is lower than a fourth water level lower than the third water level, the controller controls the electric heater to heat at a fourth power lower than the third power; when the measured water level is lower than a fifth water level lower than the fourth water level, the controller controls the electric heating device to heat at a fifth power lower than the fourth power; when the measured water level is lower than a sixth water level lower than the fifth water level, the controller controls the electric heating device to stop heating.

4. The steam generator of claim 1 wherein the electric heater is a resistance heater.

5. The steam generator of claim 4, wherein the resistive heater fills the entire square channel.

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