CN105444430B - A kind of solar water heater based on parabolic trough type light and heat collection - Google Patents

Abstract

The invention discloses a solar water heater based on a parabolic trough-type concentrated heat collection, which is characterized in that it mainly includes an air vent, a heat preservation water tank shell, a drain pipe, a cold water pipe, a water tank end cover, a hot water pipe, a parabolic trough reflector, All-glass vacuum heat collector tubes, feet, fixed-focus support parts for heat collector tubes, constant pressure valves, upper circulation pipes, cold water tanks, hot water tanks, phase-change heat storage layers, silicone leather pads, metal covers, glass conduits, silicone leather covers , a lower circulation pipe, a horizontal partition and a reflector rib; the insulated water tank shell includes a water tank inner shell and a water tank outer shell. This water heater uses a parabolic trough collector instead of multiple vacuum tubes on the market, which greatly reduces the cost and improves the heat collection efficiency of the water heater, reduces the accumulation of hot water in the vacuum tube, and facilitates maintenance and descaling of the vacuum tube.

Description

A solar water heater based on parabolic trough concentrating heat

technical field

The invention relates to the technical field of solar energy utilization, in particular to a solar water heater based on a parabolic trough heat collector, in particular to a hot water device using a parabolic trough heat collector to provide domestic hot water for users.

Background technique

Traditional energy is increasingly scarce, and it has become the consensus of countries all over the world to accelerate the development of renewable energy. Solar energy, as a type of renewable energy, has multiple uses in people's daily needs, such as power generation, heating, and hot water supply. But at present, only solar water heaters can be supplied to the market in large quantities in the form of commodities. Solar water heaters can realize the conversion from solar energy to thermal energy, and improve hot water or heat sources for users' production and life. Generally, a solar water heater consists of a heat collector, an insulated water storage tank, connecting pipes, brackets and a control system. The collector is the core component and key technology for solar water heaters to convert solar radiation into heat energy, and its cost accounts for about half of the total cost of solar water heaters. At present, my country's solar water heater industry ranks first in the world in terms of application scale and production capacity. In the early stage of development, there are many problems to be solved gradually, such as its penetration rate is still very low, and the variety, function and quality of products are far from meeting the needs.

At present, the solar water heaters on the market mainly have the following deficiencies: ①The heat collection efficiency is low, and it often takes a whole day of sunshine to heat the water. There is no hot water available for part of the time, and the comfort is poor; ②The insulation performance of the water tank is poor and the hot water pipeline is more than ten meters long, which increases the heat loss and there is a lot of hot water left in the pipeline; ③More than 99% of the solar water heaters currently on the market are It is a very backward non-pressurized water heater (commonly known as the falling water type), which has only one water pipe for water inlet and outlet, which is very inconvenient to use, and there is no comfort at all; ④The quality of water heaters is uneven, some water heaters are low in cost, but efficient It is also very low, and the service life is short (about 6 to 10 months). Although some water heaters have higher efficiency, the processing technology is complicated, the cost is too high, and it is not easy to popularize; Once stained with dust and stains, it is inconvenient to clean, which will affect the heat collection efficiency.

The solar water heater provided by the invention can solve the above problems well, effectively reduce the cost of the water heater, improve the system efficiency of solar energy utilization, save energy, and is beneficial to environmental protection.

Contents of the invention

Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a solar water heater based on a parabolic trough type concentrating heat. Traditional vacuum tube solar water heaters need to be arranged with more vacuum tubes to increase the heat collecting area. The parabolic trough heat collector belongs to the category of medium and high temperature heat collectors, which can obtain high heat collection temperature. The biggest advantage of the parabolic trough collector is that it can provide light with high energy flux density, concentrate energy and reduce heat loss, and replace the high-cost vacuum tube with a relatively cheap parabolic trough reflector, reducing the cost of the entire system At the same time, the steering of the parabolic trough reflector can be continuously adjusted to obtain more solar radiation, thereby improving the heat collection effect of the collector. The structure of the heat preservation water tank is specially designed to perfectly cooperate with the parabolic trough reflector, so that the heat collection efficiency of the water heater is significantly improved, and the heat storage of the heat preservation water tank is enhanced.

The technical solution of the present invention to solve the above-mentioned technical problems is: to design a solar water heater based on parabolic trough-type concentrating heat, which is characterized in that it mainly includes an air vent, an insulated water tank shell, a drain pipe, a cold water pipe, and a water tank end cover. , hot water pipes, parabolic trough reflectors, all-glass vacuum heat collectors, feet, fixed-focus support parts for heat collectors, constant pressure valves, upper circulation pipes, cold water tanks, hot water tanks, phase change heat storage layers, silicone leather pads, Metal cover, glass conduit, silicone leather sheath, lower circulation pipe, horizontal partition and reflector ribs; the insulated water tank shell includes the inner shell of the water tank and the outer shell of the water tank, the inner shell of the water tank is the insulation layer of the water tank, and is close to the outer shell of the water tank on the inner side.

The shell of the heat-insulating water tank is installed on the top of the leg, the vent hole is arranged on the top of the shell of the heat-insulating water tank, the drain pipe is set at the bottom of the shell of the heat-insulating water tank, and the end cover of the water tank is located on the right end surface of the shell of the heat-insulating water tank; The constant pressure valve is installed on the exhaust hole.

The horizontal partition is installed inside the shell of the heat-insulating water tank, and is closely connected with the inner shell of the water tank. Water tank; there is a small hole on the end cover of the water tank corresponding to the space where the cold water tank is located, and a cold water pipe is installed on the small hole; there is a small hole on the end cover of the water tank corresponding to the space where the hot water tank is located. A cold water pipe is installed on it.

A plurality of small holes are opened on the horizontal partition, and an upper circulation pipe facing upward and a lower circulation pipe facing downward are installed on the small hole, and the upper circulation pipe and the lower circulation pipe are located in the cold water tank and the hot water tank respectively; There is a hole on the bottom of the heat preservation water tank shell just below the circulation pipe, and the lower circulation pipe passes through the hole and connects with the glass conduit through the silicone leather sleeve; , the open end of the all-glass vacuum heat collecting tube is sealed and installed in the hole at the bottom of the thermal insulation water tank shell directly below the lower circulation tube through a silica gel pad and a metal cover.

The phase change heat storage layer is installed on the inner shell of the water tank inside the hot water tank.

The parabolic trough reflector is installed under the all-glass vacuum heat collecting tube.

A reflector rib is installed on the back of the parabolic trough reflector to prevent the parabolic trough reflector from being deformed.

There are multiple fixed-focus support parts for the heat collecting tube, which are set on the outer tube wall of the all-glass vacuum heat collecting tube.

Compared with the prior art, the present invention has the beneficial effect that: the water heater only needs three heat collecting tubes and three parabolic troughs to realize high-efficiency heat collection, which not only reduces the cost to a great extent, but also reduces water resources waste, easy maintenance and descaling. The thermal insulation water tank adopts phase change material to store heat, which effectively solves the problem of insufficient hot water supply during the day and night, and can stabilize the water temperature of the water tank, so that the water heater can maintain high-efficiency operation and meet the user's comfort requirements. The water heater has unlimited service life, can be used throughout the year and is equipped with water inlet pipes and water outlet pipes. It is very convenient to use, low in price, easy to maintain, free to disassemble, very easy to mass produce, and has great market prospects.

Description of drawings

Fig. 1 is an overall structure diagram of an embodiment of a solar water heater based on a parabolic trough concentrating heat of the present invention.

Fig. 2 is a cross-sectional view of an embodiment of a solar water heater based on a parabolic trough solar collector according to the present invention.

Fig. 3 is a schematic view of the vertical cross-sectional structure of a phase-change heat storage layer of an embodiment of a solar water heater based on a parabolic trough concentrating heat of the present invention.

Fig. 4 is a schematic diagram of water circulation of an embodiment of a solar water heater based on a parabolic trough concentrating heat of the present invention.

Fig. 5 is a schematic structural view of a parabolic trough reflector reversed according to an embodiment of a solar water heater based on a parabolic trough concentrating heat of the present invention.

detailed description

Further describe the present invention below in conjunction with accompanying drawing.

The present invention is a solar water heater based on parabolic trough-type concentrating heat (abbreviated as water heater, see Figure 1-5), which is characterized in that it mainly includes an air vent 1, an insulated water tank shell 2, a drain pipe 3, and a cold water pipe 4 , water tank end cover 5, hot water pipe 6, parabolic trough reflector 7, all-glass vacuum heat collecting tube 8, feet 9, heat collecting tube fixed-focus support part 10, constant pressure valve 11, upper circulation pipe 13, cold water tank 14, heat Water tank 15, phase change heat storage layer 16, silica gel pad 18, metal cover 19, glass conduit 20, silica gel sheath 21, lower circulation pipe 22, horizontal partition 24 and reflector rib 25; the heat preservation water tank The casing 2 includes a water tank inner shell 201 and a water tank outer shell 202 , the water tank inner shell 201 is a water tank insulation layer, and is close to the inner surface of the water tank outer shell 202 .

The insulating water tank shell 2 is installed on the top of the supporting foot 9, the vent hole 1 is arranged on the top of the insulating water tank shell 2, the drain pipe 3 is arranged on the bottom of the insulating water tank shell 2, and the water tank end cover 5 is located in the insulating water tank shell 2 on the right end face. The constant pressure valve 11 is installed on the exhaust hole 1 .

The horizontal partition 24 is installed inside the heat-insulating water tank shell 2, and is closely connected with the inner shell 201 of the water tank, and divides the inner space of the heat-insulating water tank shell 2 into upper and lower parts, and the upper part is the cold water tank 14 , the lower part is hot water tank 15. The corresponding water tank end cover 5 positions of the space of cold water tank 14 place have aperture, and cold water pipe 4 is installed on the aperture. Have aperture on the corresponding water tank end cover 5 positions of the space of hot water tank 15 place, and cold water pipe 6 is installed on the aperture.

A plurality of small holes are arranged on the horizontal dividing plate 24, and the upper circulation pipe 13 facing upward and the lower circulation pipe 22 facing downward are installed on the small hole, and the upper circulation pipe 13 and the lower circulation pipe 22 are located at the cold water tank 14 and the water tank respectively. In the hot water tank 15. There is a hole on the bottom of the thermal insulation water tank housing 2 directly below the lower circulation pipe 22 , and the lower circulation pipe 22 passes through the hole and is connected with the glass conduit 20 through the silicone leather sheath 21 . The glass conduit 20 is located on the outside of the hot water tank, and is covered with an all-glass vacuum heat-collecting tube 8. The open end of the all-glass vacuum heat-collecting tube 8 is sealed and installed on the thermal insulation just below the lower circulation tube 22 through a silicone leather pad 18 and a metal cover 19. In the hole at the bottom of the water tank housing 2.

The phase change heat storage layer 16 is installed on the water tank inner shell 201 inside the hot water tank 15 .

The parabolic trough reflector 7 is installed under the all-glass vacuum heat collecting tube 8 .

A reflector rib 25 is installed on the back of the parabolic trough reflector 7, which is used to prevent the parabolic trough reflector 7 from being deformed, and at the same time, it can also play a protective role.

There are multiple fixed-focus support members 10 for the heat collecting tube, which are sleeved on the outer tube wall of the all-glass vacuum heat collecting tube 8 .

The support foot 9 is an inverted "V"-shaped hollow slope surface structure, one of which is composed of two supporting legs, and the other slope surface is a trapezoidal structure composed of multiple crosspieces and two supporting legs. The heat preservation water tank shell 2 is installed on the top of the inverted "V" shape of the feet 9, the parabolic trough reflector 7 is installed on the trapezoidal slope surface of the feet 9, and the all-glass vacuum heat collecting tube 8 is installed on the parabolic trough reflector 7 , and the parabolic trough reflector 7 can rotate around the axis of the all-glass vacuum heat collecting tube 8 .

The phase-change heat storage layer 16 is a structure with a steel shell and filled with phase-change materials inside. It is roughly in the shape of a hollow column, attached to the inner wall of the hot water tank 15 and supports the horizontal partition 24 . There is a notch on the phase-change heat storage layer 16 facing directly below the lower circulation pipe 22, and the size of the notch is the same as the transverse cross-sectional area of the all-glass vacuum heat collecting tube 8. The top surface of the phase-change heat storage layer 16 is horizontally provided with grooves, and the grooves and grooves communicate with the interior thereof, and the multiple small holes that are provided on the horizontal partition 24 are all connected with the grooves, and are installed on the horizontal partition. The lower circulation pipe 22 on the 24 can straightly pass through the channel and the notch of the phase-change heat storage layer 16 simultaneously.

The housing 2 of the thermal insulation water tank is cylindrical, and the shape of the phase change heat storage layer 16 is roughly 2/3 of a hollow cylindrical ring (as shown in FIG. 3 ).

There is an opening on the right side end surface of the phase change heat storage layer 16, which is convenient to directly apply force to the side end surface after opening the water tank end cover 5, and extract the phase change heat storage layer 16 for maintenance or replacement.

The parabolic trough reflector 7, the all-glass vacuum heat collecting tube 8 and the fixed-focus support part 10 of the heat collecting tube form a parabolic trough heat collector. The parabolic trough reflector 7 can rotate around the axis of the all-glass vacuum heat collecting tube 8, and can be manually adjusted to align with the sun to obtain the maximum heat collection. ) The parabolic trough reflector 7 with a suitable ratio can satisfy the time period of strong sunlight (10 am to 3:30 pm), and the light reflected by the parabolic trough reflector 7 is still irradiated on the all-glass vacuum heat collecting tube 8 , at this time the geometric concentration ratio of the parabolic trough collector is 8, and the focal length is 80mm. When running into severe weather such as hail, the parabolic trough reflector 7 can be reversed to protect the all-glass vacuum heat collecting tube 8 from being damaged. Simultaneously, the back of the parabolic trough reflector 7 is equipped with a reflector rib 25 which plays a role in shaping, as shown in Fig. 5 .

The shape of the phase-change heat storage layer 16 is roughly 2/3 hollow cylindrical rings (as shown in Figure 3 ), and the outside of the cylindrical ring is a steel structure with a certain strength, and the inside is filled with phase-change materials, phase-change temperature and phase-change layer The thickness needs to be selected according to the needs, and the economy should also be considered. The phase-change heat storage layer 16 is attached to the inner shell 201 of the water tank. The width of the gap at the bottom of the hollow cylindrical ring is the length of the outer diameter of the all-glass vacuum heat collecting tube 8, and its axis is the axis of the water tank. The upper part of the hollow cylindrical ring supports a horizontal partition 24 . A cold water pipe 4 and a hot water pipe 6 are installed on the water tank end cover 5, and the water tank end cover 5 and the insulated water tank shell 2 are threadedly connected, which can be disassembled to facilitate descaling inside the water tank and inspection of phase change heat storage layer 16. Phase change material leaks. When disassembling, hold the cold water pipe 4 and the hot water pipe 6 with both hands and rotate outwards to separate the water tank end cover 5 from the heat preservation water tank 1, check the sealing condition of the heat preservation water tank, pull out the phase change heat storage layer 16, and check whether the phase change material is leaks or to be replaced periodically.

There are seven holes left on the horizontal partition 24, and four upper circulation pipes 13 and three lower circulation pipes 22 are respectively welded on both sides of the holes. The phase-change heat storage layer 16 is supported and sealed, and the welded part is treated with anticorrosion, so that the inside of the thermal insulation water tank is divided into a cold water tank 14 and a hot water tank 15 . The positioning of the three lower circulation pipes 22 is respectively at 1/6, 1/2, and 5/6 of the longitudinal length of the horizontal partition 24, and the four upper circulation pipes 13 are evenly distributed in pairs between the lower circulation pipes 22, and the lower circulation pipes 22 lengths extend to the bottom of the insulated water tank and are connected with the glass conduit 20 by the silica gel sheath 21, and the glass conduit 20 stretches into the bottom of the all-glass vacuum heat collecting tube 8. The all-glass vacuum heat collecting tube 8 is engaged with the heat-insulating water tank shell 2 through the external thread of the metal end cover 19 and the internal thread at the bottom hole of the heat-insulating water tank shell 202, and is squeezed between the metal end cover 19 and the heat-insulating water tank by rotating the metal end cover 19. The silica gel pad 18 between the inner shells 201 realizes the tight connection between the all-glass vacuum heat collecting tube 8 and the housing 2 of the thermal insulation water tank, meeting the sealing requirements (as shown in FIG. 2 ).

The water circulation operation principle of this water heater is explained in detail below, see Figure 4.

Before the water heater is in operation, first adjust the orientation of the water heater and the position of the parabolic trough reflector 7, the parabolic trough reflector 7 reflects the sunlight to the tube wall of the all-glass vacuum heat collecting tube 8 for heat collection, and the cold water is transported from the cold water tube 4 into the heat preservation water tank, Due to the blocking effect of the horizontal partition 24, the cold water is in the upper layer of the heat preservation water tank, that is, the cold water tank 14, and then the cold water enters the bottom of the all-glass vacuum heat collecting tube 8 through the lower circulation pipe 22 and the glass conduit 20 under the action of gravity, and gradually absorbs all The temperature of the glass vacuum heat collecting tube 8 tube wall, the temperature rises and the density decreases, and gradually rises into the hot water tank 15. If the water temperature meets the use requirements, it can be discharged from the hot water tube 6 (the direction of the water flow is as shown in the black bold arrow in Figure 4. shown), if the water temperature does not meet the requirements for use or the user is not in a hurry to use it, the water level in the hot water tank 15 will gradually rise, and as the water level rises, the air in the hot water tank 15 will be gradually pressed into the cold water through the upper circulation pipe 13 In the box 14, the constant pressure valve 11 on the exhaust hole 1 feels the pressure and automatically exhausts it (the direction of the gas is shown by the black arrow in Figure 4). The water level is still rising, and gradually enters the cold water tank 14 through the upper circulation pipe 13. When the water level in the cold water tank 14 reaches the limit value, stop sending cold water to the cold water pipe 4, so that the water in the water heater starts to circulate naturally due to the density difference , and then the water temperature in the hot water tank 15 continues to rise. When the temperature reaches the phase change temperature of the phase change material in the phase change heat storage layer 16, the phase change material begins to melt, further increasing the heat storage capacity of the heat preservation water tank, and also makes the The water temperature in the all-glass vacuum heat collecting tube 8 is not too high, and the temperature difference between the water temperature and the tube wall is as large as possible to satisfy better heat exchange, thereby improving the heat collecting efficiency.

According to the above principles, a solar water heater experiment platform based on parabolic trough concentrating heat collection with a heat collection area of ^1.54m2 was built. No horizontal partitions were installed in the water tank and no phase change heat storage layer was added. Refer to the national standard GB/T 12915-91 and GB/T 18708-2002 for test and test, calculate the heat gain of the collector by measuring the water temperature of the heat preservation water tank, and arrange the upper, middle and lower three measuring points in the water tank for more accurate Observe the change of water temperature, and take the average temperature as the water temperature of the water tank. During the experiment, two sets of parabolic trough collectors were used for testing. The main parameters of the water heater: the geometric concentration ratio of the parabolic trough collector is 8.2, the length of the paraboloid is 1710mm, the width of the paraboloid is 450mm, the focal length of the paraboloid is 84mm, the capacity of the water storage tank is 100L, and the total The specification of glass vacuum heat collecting tube is 58/47×1800, water capacity: 2.75L. The water heater is arranged from east to west, facing south; adjust the inclination angle of the parabolic trough reflector so that the shadow of the vacuum tube falls on the center of the parabolic trough reflector. The inclination angle of the trough reflector. According to the experiment, the total heat collection energy rate is 0.381W, and the corresponding light collection rate is 0.481kW/m ² . At the same time, the experiment shows that the daily average efficiency of the parabolic trough collector under the action of natural circulation is between 45% and 50%. decline, but the fluctuation range is not very large, which shows that the parabolic trough collector can efficiently convert light energy into heat energy at a higher temperature range. The measured heat loss of the water heater system is about 1.05W/(㎡·℃), which shows that the heat preservation performance of the water heater is good. The daily useful heat gain is about 9.5MJ/m ² , which is greater than the standard value of 7.5MJ/m ² . It can be seen that two sets of parabolic trough collectors with an area of 0.77m ² and a 100L water tank can meet the standard requirements. The performance of the water heater will be further improved when the horizontal partitions that are conducive to water circulation and the phase-change heat storage layer that increases the heat storage capacity of the thermal insulation tank are installed, so this solar water heater based on parabolic trough concentrating heat has good collection performance. Thermal properties and market prospects.

This water heater uses three sets of parabolic trough collectors instead of multiple vacuum tubes on the market, which greatly reduces the cost and improves the heat collection efficiency of the water heater, reduces the accumulation of hot water in the vacuum tubes, and facilitates maintenance and descaling of the vacuum tubes. The installation of horizontal partitions in the thermal insulation water tank makes the cold and hot water well separated, further improving the efficiency of the water heater. The thermal insulation tank uses phase change materials to store heat, which effectively solves the problem of insufficient hot water supply during the day and night, and can control The water temperature of the water tank keeps the water heater running at high efficiency and meets the user's comfort requirements. The water heater is convenient to use, low in price, simple in maintenance, free in disassembly and assembly, very easy to be mass-produced, and has great market prospects.

What is not mentioned in the present invention is applicable to the prior art.

Claims (9)

1. a solar water heater based on parabolic trough type light and heat collection, it is characterised in that mainly include aerofluxus Hole, attemperater housing, tapping pipe, cold water pipe, water tank end cap, hot-water line, parabola groove reflector, complete Glass heat-collecting vacuum tube, leg, thermal-collecting tube focus support member, constant pressure valve, upper circular tube, cold water storage cistern, Boiler, phase-change thermal storage layer, silica gel leather packing, metal cover, grass tube, silica gel leather sheath, lower circulation pipe, Horizontal baffle and reflector floor；Described attemperater housing includes water tank inner shell and tank shell, in water tank Shell is water tank heat-insulation layers, is close on tank shell medial surface；

Described attemperater housing is arranged on the top of leg, and steam vent is arranged at the top of attemperater housing, Tapping pipe is arranged at the bottom of attemperater housing, and water tank end cap is positioned on the right side of attemperater housing； Described constant pressure valve is arranged on steam vent；

Described horizontal baffle is arranged on the inside of attemperater housing, and and water tank inner shell between compact siro spinning technology, The inner space of attemperater housing is divided into upper and lower two parts, and top is divided into cold water storage cistern, bottom to be divided into Boiler；Have aperture on water tank end cap position corresponding to the space at cold water storage cistern place, aperture is provided with Cold water pipe；Have aperture on water tank end cap position corresponding to the space at boiler place, aperture is provided with Hot-water line；

Have multiple aperture on described horizontal baffle, aperture is provided with upper circular tube upward and down under Circulation pipe, upper circular tube and lower circulation pipe lay respectively in cold water storage cistern and boiler；Immediately below lower circulation pipe Having hole on the bottom of attemperater housing, lower circulation pipe is through this hole by silica gel leather sheath with grass tube even Connect；Grass tube is positioned at the outside of boiler, is cased with all-glass vacuum thermal-collecting tube, all-glass vacuum outside it The opening of thermal-collecting tube is sealingly mounted at the insulation water immediately below lower circulation pipe by silica gel leather packing and metal cover In the hole of the bottom of tank shell；

Described phase-change thermal storage layer is arranged on the water tank inner shell within boiler；

Described parabola groove reflector is arranged on the lower section of all-glass vacuum thermal-collecting tube；

The back side of described parabola groove reflector is provided with reflector floor, is used for preventing parabola groove reflector from occurring Deformation；

It is multiple that described thermal-collecting tube focuses support member, is enclosed within the outside tube wall of all-glass vacuum thermal-collecting tube.

Water heater the most according to claim 1, it is characterised in that described leg is that inverted " V " type is hollow Slope construct, one of them slope is made up of two supporting legs, another slope be by multiple crosspieces, The ladder configuration of two supporting leg compositions.

Water heater the most according to claim 2, it is characterised in that described attemperater housing is arranged on The top of the inverted " V " type of leg, parabola groove reflector is arranged on the ladder type slope of leg, and full glass is true Empty set heat pipe is arranged on parabola groove reflector, and parabola groove reflector can be around the axle of all-glass vacuum thermal-collecting tube The heart rotates.

Water heater the most according to claim 1, it is characterised in that described phase-change thermal storage layer is that shell is Steel construction, the internal structure filling phase-change material, be generally shaped like open column shape, be fitted in the interior of boiler Play a supportive role on wall and to horizontal baffle；Below lower circulation pipe just to phase-change thermal storage layer on have notch, The size of notch is identical with all-glass vacuum thermal-collecting tube lateral cross-sectional area；The end face of phase-change thermal storage layer is laterally opened Having a conduit, notch, conduit internal connect with it, multiple apertures that horizontal baffle has all with described conduit Connection, and the lower circulation pipe being arranged on horizontal baffle can be simultaneously straight across conduit and the groove of phase-change thermal storage layer Mouthful.

5. according to the water heater described in any one of claim 1 or 3, it is characterised in that described attemperater Housing is hollow cylinder, now phase-change thermal storage layer be generally shaped like 2/3 open circles band of column.

Water heater the most according to claim 1, it is characterised in that leave seven on described horizontal baffle Individual hole, both sides, hole correspondence four upper circular tubes of welding and three lower circulation pipes respectively, horizontal baffle is welded on guarantor At the 1/3 of reservoir longitudinal direction, phase-change thermal storage layer supporting and do encapsulation process, weld does preservative treatment； The location of three lower circulation pipes at 1/6,1/2, the 5/6 of horizontal baffle longitudinal length, four is followed respectively Endless tube is evenly distributed between lower circulation pipe two-by-two.

Water heater the most according to claim 1, it is characterised in that described all-glass vacuum thermal-collecting tube with Attemperater housing is engaged by the female thread at the external screw thread of metal end and the hole of attemperater outer casing bottom Connecting, the Silicone Rubber being squeezed between metal end and attemperater inner shell by rotating metallic end cap pads existing Being fastenedly connected between all-glass vacuum thermal-collecting tube and attemperater housing.

8. according to the water heater described in any one of claim 1 or 4, it is characterised in that described phase-change thermal storage Opening is had in its right end face of layer.

Water heater the most according to claim 1, it is characterised in that described water tank end cap and attemperater Use detachable threaded between housing.