CN110725999A - Gas combination valve with dry burning prevention function - Google Patents

Abstract

The invention discloses a gas combination valve with an anti-dry burning function, which comprises: the gas inlet channel, the gas outlet channel, the thermal expansion valve component and the flameout protection switch valve are arranged on the gas inlet channel; the thermostatic expansion valve assembly comprises an expansion valve body, an expansion valve spool and a temperature sensing bulb arranged on a heated object, wherein an expansion valve cavity is arranged in the expansion valve body, a medium in the temperature sensing bulb can drive the expansion valve spool to move when being heated and expanded, the flameout protection switch valve closes an air inlet channel or an air outlet channel when flame of the gas burner is extinguished, and when the heated object is burnt dry and reaches a certain temperature, the medium in the temperature sensing bulb drives the expansion valve spool to move to a position for closing the thermostatic expansion valve assembly so as to cut off an air source and extinguish the flame, thereby preventing accidents; meanwhile, the flameout protection switch valve cuts off the gas source after the flame is extinguished, so that the gas leakage caused by the gas source opened by the thermal expansion valve component after the temperature of the heated object and the temperature sensing bulb is reduced can be avoided, and the use safety of the gas equipment is further improved.

Description

Gas combination valve with anti-dry function

technical field

The invention relates to the field of gas equipment, in particular to a gas combination valve with anti-dry burning function.

Background technique

At present, gas appliances such as gas stoves or gas water heaters have been widely used. In order to improve the safety of gas appliances, gas appliances are basically equipped with flameout protection control components, and the function of flameout and closing the gas channel is realized through thermocouples or probes. However, in the actual use process, there will still be the problem of dry burning of the burner, such as the water in the pot is boiled dry, the water heater cannot be filled with water, etc., if it is not handled properly, it will cause a safety accident.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a gas combination valve with an anti-dry burning function.

The technical scheme adopted by the present invention to solve its technical problems is:

A gas combination valve with anti-dry burning function, comprising: an air inlet channel, an air outlet channel, a thermal expansion valve assembly, and a flameout protection switch valve; the thermal expansion valve assembly includes an expansion valve body, an expansion valve core, and a set of In the temperature sensing package on the object to be heated, the expansion valve valve body is provided with an expansion valve valve cavity connected with the intake passage or the exhaust passage, the expansion valve core is movably arranged in the expansion valve valve cavity, and the sensing When the medium in the temperature bulb is heated and expands, it can drive the expansion valve core to move, and the flameout protection switch valve can be connected with the flameout protection control component of the gas equipment and close the intake passage or the outlet passage when the flame of the gas burner is extinguished.

One of the above technical solutions has at least one of the following advantages or beneficial effects: when the object to be heated (such as a pot, a heating water pipe of a water heater) is dry-burning, and the object to be heated and the temperature sensor reach a certain temperature, the The medium in the temperature bulb drives the expansion valve spool to move to the position where the thermal expansion valve assembly is closed, thereby closing the intake channel or the exhaust channel to cut off the air source, extinguish the flame, and prevent accidents; at the same time, the flameout protection switch valve is extinguished when the flame is extinguished. After that, the air inlet or outlet channel is also closed to cut off the gas source, which can avoid the gas leakage caused by the thermal expansion valve assembly opening the gas source after the temperature of the heated object and the temperature sensing package is reduced (the medium shrinks), and further improves the safety of the gas equipment.

In some specific embodiments, the expansion valve core includes a blocking member that is slidably arranged in the valve cavity of the expansion valve and can block the valve cavity of the expansion valve, the blocking member is provided with a driving cylinder and a A piston member slidingly matched with the driving cylinder, the piston member is fixedly connected with the valve body of the expansion valve, the temperature sensing package is connected to the driving cylinder, and the medium in the temperature sensing package is heated and expanded to push the driving cylinder and the blocking member to move , in order to achieve the function of expansion drive, and the structure is compact.

In some specific embodiments, the temperature sensing bulb is connected to the piston member through a connecting pipe and communicated with the driving cylinder through the piston member, so that the medium in the temperature sensing bulb is communicated with the cylinder body. inside, and the structure layout is reasonable.

In some specific embodiments, a compression spring is provided between the blocking member and the valve body of the expansion valve, and the compression spring can provide the blocking member with a force for driving the blocking member to block the valve cavity of the expansion valve. The elastic force of the position is used to block the valve cavity of the expansion valve with the auxiliary blocking member, so as to maintain its good closing performance and ensure the normal anti-dry burning function.

In some specific embodiments, a stepped structure is provided in the valve cavity of the expansion valve, and the blocking member can move to cooperate with the stepped structure to block the valve cavity of the expansion valve, and has better sealing performance.

In some specific embodiments, the lower end of the blocking member is provided with a guide post, and the valve cavity of the expansion valve is provided with a guide hole matched with the guide post, so as to ensure the movement accuracy of the blocking member and ensure its good performance. closure performance.

In some specific embodiments, the flameout protection switch valve includes a solenoid valve disposed on the intake passage. When the flame of the gas burner is extinguished, the solenoid valve closes the intake passage, thereby realizing flameout protection.

In some specific embodiments, a gas flow control valve assembly is also included, the gas flow control valve assembly can control the gas flow between the inlet passage and the outlet passage, realize the adjustment of the flame size, and make the thermal expansion valve And the flameout protection switch valve is integrated with the gas flow control valve to improve the compactness of the structure.

In some specific embodiments, the gas flow control valve assembly includes a flow control valve body and a valve core disposed in the flow control valve body, the flameout protection switch valve includes a solenoid valve, the flow control valve The valve body is provided with an elongated valve cavity, the valve core is arranged at the front end of the elongated valve cavity, the solenoid valve is arranged at the rear end of the elongated valve cavity, and an air inlet is arranged in the middle of the elongated valve cavity, The electromagnetic valve can cut off the communication state between the air inlet and the front end of the long valve cavity, and the thermal expansion valve assembly includes an expansion valve body arranged at the air inlet and an expansion valve arranged in the expansion valve body. The valve core, the intake passage is arranged on the valve body of the expansion valve, the expansion valve valve core can cut off the communication state between the intake passage and the intake port, and the outlet passage is arranged on one side of the front end of the valve body of the flow control valve The valve core can control the air outlet flow of the air outlet passage, and integrates the thermal expansion valve, the solenoid valve, the air inlet passage and the air outlet passage by using the flow control valve body, which has a compact and reasonable structure and is convenient for maintenance and debugging.

In some specific embodiments, the solenoid valve is arranged at the rear end of the flow control valve body, the valve core is arranged at the front end of the flow control valve body, the thermal expansion valve assembly is arranged at one side of the flow control valve body, and the air outlet The channel is arranged on the other side of the flow control valve body, which makes full use of the installation space, reduces the space occupied by the combination valve, and facilitates installation and maintenance.

Description of drawings

Below in conjunction with accompanying drawing and embodiment, the present invention is further described;

1 is a schematic structural diagram of a specific embodiment of the present invention;

2 is a schematic cross-sectional view of a specific embodiment of the present invention;

FIG. 3 is an exploded schematic diagram of a specific embodiment of the present invention.

Detailed ways

This part will describe the specific embodiments of the present invention in detail, and the preferred embodiments of the present invention are shown in the accompanying drawings. Each technical feature and overall technical solution of the invention should not be construed as limiting the protection scope of the invention.

In the description of the present invention, it should be understood that the azimuth description, such as the azimuth or position relationship indicated by up, down, front, rear, left, right, etc., is based on the azimuth or position relationship shown in the drawings, only In order to facilitate the description of the present invention and simplify the description, it is not indicated or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below, within, etc. are understood as including this number. If it is described that the first and the second are only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance, or indicating the number of the indicated technical features or the order of the indicated technical features. relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

As shown in Figure 1, a gas combination valve with anti-dry burning function includes: an intake passage 11, an air outlet passage 12, a thermal expansion valve assembly 2, and a flameout protection switch valve; the thermal expansion valve assembly 2 includes an expansion valve body 22. The expansion valve core 23 and the temperature sensing package 21 arranged on the object to be heated, the expansion valve valve body 22 is provided with an expansion valve valve cavity 24 connected with the intake passage 11 or the exhaust passage 12, and the expansion valve core 23 is movable in the expansion valve cavity 24. When the medium in the temperature sensing package 21 is heated and expands, it can drive the expansion valve core 23 to move. When extinguished, the intake passage 11 or the outlet passage 12 is closed.

When the object to be heated (such as a pot, the heating water pipe of a water heater) is dry-burning, and the object to be heated and the temperature sensing package 21 reach a certain temperature, the medium in the temperature sensing package 21 drives the expansion valve spool 23 to move to close thermal expansion. The position of the valve assembly 2, thereby closing the air inlet passage 11 or the air outlet passage 12 to cut off the air source, extinguish the flame, and prevent the occurrence of accidents; at the same time, the flameout protection switch valve also closes the air inlet passage 11 or the air outlet passage 12 after the flame is extinguished. The gas source can avoid gas leakage caused by the thermal expansion valve assembly 2 opening the gas source after the temperature of the object to be heated and the temperature sensing package 21 decreases (the medium shrinks), and further improves the safety of the gas equipment.

In some specific embodiments, as shown in FIG. 2 and FIG. 3 , the expansion valve core 23 includes a blocking member 231 slidably disposed in the expansion valve cavity 24 and capable of blocking the expansion valve cavity 24 . A driving cylinder 232 and a piston member 233 slidably matched with the driving cylinder 232 are arranged on the member 231. The piston member 233 is fixedly connected with the expansion valve body 22, and the temperature sensing bulb 21 is communicated with the driving cylinder 232. The heating and expansion of the medium can push the driving cylinder 232 and the blocking member 231 to move, so as to achieve the function of expansion driving, and the structure is compact.

Of course, in the specific implementation process, a cylinder can also be set in the expansion valve body 22, a piston can be set in the cylinder, and then the piston is connected to the blocking member 231, and the temperature sensing package 21 is connected to the cylinder, which can also be achieved. The driving function of the blocking member 231 will not be described in detail here.

In some specific embodiments, as shown in FIG. 2 and FIG. 3 , the temperature sensing bulb 21 is connected to the piston member 233 through a connecting pipe 211 and communicated with the driving cylinder 232 through the piston member 233, so that the temperature sensing bulb 21 is connected to the driving cylinder 232. The medium in 21 is connected to the cylinder body, and the structure layout is reasonable.

In some specific embodiments, as shown in FIG. 2 and FIG. 3 , a compression spring 234 is provided between the blocking member 231 and the expansion valve body 22 , and the compression spring 234 can provide the blocking member 231 with a The elastic force of the member 231 driving to the position of blocking the expansion valve cavity 24 to assist the blocking member 231 to block the expansion valve cavity 24 to maintain its good closing performance and ensure the normal dry burning prevention function.

In some specific embodiments, as shown in FIGS. 2 and 3 , a stepped structure 241 is provided in the valve cavity 24 of the expansion valve, and the blocking member 231 can be moved to cooperate with the stepped structure 241 to block the valve cavity 24 of the expansion valve. , has good sealing performance.

In some specific embodiments, as shown in FIGS. 2 and 3 , the lower end of the blocking member 231 is provided with a guide post 235 , and the valve cavity 24 of the expansion valve is provided with a guide hole 242 matched with the guide post 235 to ensure the sealing The movement accuracy of the blocking piece 231 ensures its better closing performance.

In some specific embodiments, as shown in FIG. 2 and FIG. 3 , the flameout protection switch valve includes a solenoid valve 31 arranged on the intake passage 11 . When the flame of the gas burner is extinguished, the flameout protection control of the gas equipment The assembly can control the solenoid valve 31 to close the intake passage 11, thereby realizing flameout protection.

In a specific implementation process, the flameout protection control component of the gas equipment may include a thermocouple or flame probe set at the flame position and a controller connected to the thermocouple or flame probe. When the thermocouple or flame probe detects that the flame is extinguished When , the controller can control the solenoid valve 31 to close, so as to realize flameout protection. The flameout protection control component of gas equipment is relatively common in the field of gas equipment, and its specific control principle will not be described in detail here.

Of course, in the specific implementation process, the flameout protection switch valve may also be a mechanical valve or a mechanical switch valve driven by a motor, such as a plunger valve, a ball valve, etc., which will not be described in detail here.

In some specific embodiments, as shown in FIG. 2 and FIG. 3 , a gas flow control valve assembly 4 is further included, and the gas flow control valve assembly 4 can control the gas flow between the intake passage 11 and the gas outlet passage 12 , The adjustment of the flame size is realized, and the thermal expansion valve and the flameout protection switch valve are integrated with the gas flow control valve to improve the compactness of the structure.

In some specific embodiments, as shown in FIG. 3 , the gas flow control valve assembly 4 includes a flow control valve body 41 and a valve core 42 arranged in the flow control valve body 41 . Position to achieve flow regulation.

Of course, in the specific implementation process, the valve core 42 may be a plug valve core (conical or conical shape), or a ball valve core, which will not be described in detail here.

In some specific embodiments, as shown in FIG. 2 and FIG. 3 , the flameout protection switch valve includes a solenoid valve 31 , a long valve cavity is arranged in the valve body 41 of the flow control valve, and the valve core 42 is arranged in the long valve. The front end of the cavity, the solenoid valve 31 is arranged at the rear end of the long valve cavity, and an air inlet 431 is arranged in the middle of the long valve cavity. The solenoid valve 31 can cut off the communication state between the air inlet 431 and the front end of the long valve cavity. , the thermal expansion valve assembly 2 includes an expansion valve valve body 22 disposed at the intake port 431 and an expansion valve valve core 23 disposed in the expansion valve valve body 22. The intake passage 11 is disposed on the expansion valve valve body 22, and the expansion valve The valve core 23 can cut off the communication state between the intake passage 11 and the intake port 431 , the outlet passage 12 is arranged on one side of the front end of the valve body 41 of the flow control valve, and the valve core 42 can control the outlet flow of the outlet passage 12 . The valve body of the control valve integrates the thermal expansion valve, the solenoid valve, the intake channel 11 and the exhaust channel 12 into one body, with a compact and reasonable structure, and is convenient for maintenance and debugging.

In some specific embodiments, as shown in FIGS. 2 and 3 , the solenoid valve 31 is arranged at the rear end of the flow control valve body 41 , the valve core 42 is arranged at the front end of the flow control valve body 41 , and the thermal expansion valve assembly 2 It is arranged on one side of the valve body 41 of the flow control valve, and the outlet channel 12 is arranged on the other side of the valve body 41 of the flow control valve, which makes full use of the installation space, reduces the space occupied by the combination valve, and facilitates installation and maintenance.

In some specific embodiments, as shown in FIG. 2 , a partition screen 432 is provided at the air inlet 431 to reduce accidental entry into the flow control valve.

Those skilled in the art can easily understand that, under the premise of no conflict, the above preferred modes can be freely combined and superimposed.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the technical field, various changes can also be made without departing from the purpose of the present invention. .

Claims (10)

1. Gas combination valve of dry combustion method function is prevented in area, its characterized in that includes:

an intake passage (11);

an outlet channel (12);

the heating power expansion valve assembly (2), the heating power expansion valve assembly (2) includes an expansion valve body (22), an expansion valve spool (23) and a temperature sensing bulb (21) arranged on a heated object, an expansion valve cavity (24) connected with an air inlet channel (11) or an air outlet channel (12) is arranged in the expansion valve body (22), the expansion valve spool (23) is arranged in the expansion valve cavity (24), and a medium in the temperature sensing bulb (21) can drive the expansion valve spool (23) to move when being heated and expanded;

a flameout protection switch valve which can be connected with a flameout protection control assembly of the gas equipment and closes the gas inlet channel (11) or the gas outlet channel (12) when the flame of the gas burner is extinguished.

2. The gas combination valve with dry burning prevention function according to claim 1,

the expansion valve core (23) comprises a plugging piece (231) which is arranged in the expansion valve cavity (24) in a sliding mode and can plug the expansion valve cavity (24), a driving cylinder (232) and a piston piece (233) which is in sliding fit with the driving cylinder (232) are arranged on the plugging piece (231), the piston piece (233) is fixedly connected with the expansion valve body (22), the temperature sensing bulb (21) is communicated into the driving cylinder (232), and a medium in the temperature sensing bulb (21) can push the driving cylinder (232) and the plugging piece (231) to move after being heated and expanded.

3. The gas combination valve with dry burning prevention function according to claim 2,

the bulb (21) is connected to the piston part (233) via a connecting tube (211) and communicates through the piston part (233) into a drive cylinder (232).

4. The gas combination valve with dry burning prevention function according to claim 2,

a compression spring (234) is arranged between the blocking piece (231) and the expansion valve body (22), and the compression spring (234) can provide an elastic force for driving the blocking piece (231) to the position for blocking the expansion valve cavity (24) for the blocking piece (231).

5. The gas combination valve with dry burning prevention function according to claim 2,

a step structure (241) is arranged in the expansion valve cavity (24), and the plugging piece (231) can move to be matched with the step structure (241) to plug the expansion valve cavity (24).

6. The gas combination valve with dry burning prevention function according to claim 2,

the lower end of the blocking piece (231) is provided with a guide post (235), and a guide hole (242) matched with the guide post (235) is arranged in the expansion valve cavity (24).

7. The gas combination valve with dry burning prevention function according to claim 1,

the flameout protection switching valve comprises an electromagnetic valve (31) arranged on the air inlet channel (11).

8. The gas combination valve with dry burning prevention function according to claim 1,

the gas flow control valve assembly (4) is further included, and the gas flow control valve assembly (4) can control the gas flow between the gas inlet channel (11) and the gas outlet channel (12).

9. The gas combination valve with dry burning prevention function according to claim 8,

the fuel gas flow control valve assembly (4) comprises a flow control valve body (41) and a valve core (42) arranged in the flow control valve body (41).

10. The gas combination valve with dry burning prevention function according to claim 9,

the flameout protection switch valve comprises an electromagnetic valve (31), a long valve cavity is arranged in a flow control valve body (41), a valve core (42) is arranged at the front end of the long valve cavity, the electromagnetic valve (31) is arranged at the rear end of the long valve cavity, an air inlet (431) is arranged in the middle of the long valve cavity, the electromagnetic valve (31) can cut off the communication state between the air inlet (431) and the front end of the long valve cavity, a thermal expansion valve component (2) comprises an expansion valve body (22) arranged at the air inlet (431) and an expansion valve core (23) arranged in the expansion valve body (22), an air inlet channel (11) is arranged on the expansion valve body (22), the expansion valve core (23) can cut off the communication state between the air inlet channel (11) and the air inlet (431), and an air outlet channel (12) is arranged on one side of the flow control valve body (41), the valve core (42) can control the outlet air flow of the outlet air channel (12).

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