Phase change heat storage greenhouse

Abstract

The utility model discloses a phase change heat storage greenhouse, and belongs to the field of greenhouses. A phase change heat storage greenhouse comprises a sunlight greenhouse, a phase change heat storage box, a data relay, a controller, a fan, a first double-end expansion and shrinkage valve, a second double-end expansion and shrinkage valve, a first stop valve, a second stop valve, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor and a fifth temperature sensor. Parameters such as temperature and illumination are detected through the sensor, the controller automatically switches heat storage / heat release modes and adjusts the air speed of the fan and the passage of the expansion valve, so that the modules in the array are ensured to work cooperatively, and heat energy is utilized efficiently.

Description

Technical Field

[0001] This utility model belongs to the field of greenhouses, and in particular relates to a phase change heat storage greenhouse. Background Technology

[0002] Phase change energy storage is a technology that utilizes phase change materials (PCMs) to undergo physical phase changes (such as solid-liquid or liquid-gas) at specific temperatures, thereby absorbing or releasing latent heat to store and release energy. Phase change energy storage has promising applications in temperature regulation in greenhouses.

[0003] Patent application number 202210616636.3 discloses a greenhouse phase change wall heat storage coupled biomass boiler heating system. This patented solution uses a wall structure, which is large in size and weight, requiring a high level of technical expertise from construction personnel. The built-in heat exchange pipes and insulation modules are fixed structures, which are easily damaged and difficult to replace during temperature changes. Furthermore, the large wall itself is a heat storage plate, and when the greenhouse temperature is high, there is a significant temperature gradient along the vertical direction of the wall, which may scorch the plants.

[0004] Patent application number 201922304376.2 discloses a water module back wall for a solar greenhouse. The water module back wall disclosed in this patent has a simple structure, is easy to install, easy to carry and transport, and has a long service life. However, as a large wall panel, its weight and volume are factors that cannot be ignored. Since it is entirely passive heat storage, its heat storage performance depends entirely on the thermal conductivity and heat storage capacity of the heat storage material. It is susceptible to strong fluctuations due to weather and other factors. At the same time, due to passive heat storage, the temperature drops slowly when it is high, making it difficult to quickly regulate the temperature inside the greenhouse, resulting in a large temperature difference inside the greenhouse. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a phase change heat storage greenhouse.

[0006] The purpose of this utility model is achieved through the following technical solution: a phase change heat storage greenhouse, including a solar greenhouse, a phase change heat storage box, a data transceiver, a controller, a fan, a first double-headed expansion and contraction valve, a second double-headed expansion and contraction valve, a first shut-off valve, a second shut-off valve, an illuminance sensor, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, and a fifth temperature sensor.

[0007] The solar greenhouse is equipped with a phase change heat storage box and a fan;

[0008] The air inlet of the phase change heat storage box is connected to the first port of the first double-headed expansion and contraction valve, the second port of the first double-headed expansion and contraction valve is connected to the air outlet of the fan via the first shut-off valve, the air outlet of the phase change heat storage box is connected to the first port of the second double-headed expansion and contraction valve, and the second port of the second double-headed expansion and contraction valve is connected to the second shut-off valve.

[0009] The first temperature sensor is located at the second port of the first double-headed expansion and contraction valve, the second temperature sensor is located at the second port of the second double-headed expansion and contraction valve, the third temperature sensor is located at the top of the solar greenhouse, the fourth temperature sensor is located at the bottom of the solar greenhouse, and the fifth temperature sensor is located inside the phase change heat storage box.

[0010] The data relay is connected to the controller, the illuminance sensor, the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, and the fifth temperature sensor, respectively.

[0011] The controller is connected to the fan, the first shut-off valve, the second shut-off valve, the first double-headed expansion and contraction valve, and the second double-headed expansion and contraction valve, respectively.

[0012] Furthermore, multiple phase change heat storage boxes are connected in sequence to form a group of phase change heat storage boxes; in each group of phase change heat storage boxes, the air inlet of the first phase change heat storage box is connected to the air outlet of the fan, and the air outlet of the previous phase change heat storage box is connected to the air inlet of the next phase change heat storage box.

[0013] Furthermore, the phase change heat storage box includes a box body with an opening on one side. The opening side of the box body is provided with a corrugated heat absorption cover for opening or closing the opening side. The box body is provided with a liquid inlet, a liquid outlet, an air inlet, and an air outlet. The box body is provided with a fifth temperature sensor and a phase change liquid pipeline. The two ends of the phase change liquid pipeline are connected to the liquid inlet and the liquid outlet, respectively.

[0014] Furthermore, the phase change heat storage box also includes a fixing structure, which includes a first support plate, a second support plate and a third support plate. The first support plate and the second support plate intersect to form an L-shaped structure, and the third support plate is hinged to the side of the second support plate away from the first support plate. The first support plate is provided with a plurality of first threaded holes, the side of the second support plate that is hinged to the third support plate is provided with a plurality of second threaded holes, and the third support plate is provided with a plurality of third threaded holes.

[0015] When the third support plate is flipped to the position where the third threaded hole connects with the corresponding second threaded hole, and the third support plate and the first support plate are on the same side of the second support plate, the first support plate, the second support plate and the third support plate form a U-shaped structure, and the box is placed inside the U-shaped structure.

[0016] Furthermore, the inner wall surface of the box is provided with a heat insulation board, and a flexible PVC water bladder is provided on the side of the heat insulation board away from the inner wall of the box.

[0017] Furthermore, the inlet and outlet of the housing are equipped with rotary outlet control valves.

[0018] Furthermore, a sealing ring is provided on the inner wall of the opening surface of the box.

[0019] Furthermore, the sealing ring is a heat-resistant foam rubber ring.

[0020] Furthermore, the corrugated heat-absorbing cover has a heat-absorbing coating on the side facing away from the housing.

[0021] Furthermore, the structure of the second dual-head expansion and contraction valve is the same as that of the first dual-head expansion and contraction valve. The first dual-head expansion and contraction valve includes a valve cavity, a first port and a second port on the valve cavity, a straight first channel and a curved second channel are provided in the valve cavity, an expansion tube is provided in the second channel, the two ends of the first channel are connected to the first port and the second port respectively, the two ends of the second channel are connected to the first port and the second port respectively, and a channel switching valve for switching the first channel or the second channel is provided in the valve cavity.

[0022] The beneficial effects of this utility model are: This utility model detects parameters such as temperature and light by sensors, and the controller automatically switches between heat storage / heat release modes and adjusts the fan speed and expansion valve passage to ensure that all modules in the array work together and efficiently utilize thermal energy. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a greenhouse structure according to the present invention;

[0024] Figure 2 This is a schematic diagram of a structure of a phase change heat storage box.

[0025] Figure 3 This is a schematic diagram of a corrugated heat absorption hood in a phase change heat storage box.

[0026] Figure 4 This is a schematic diagram showing the installation of the insulation plate and PVC water bladder in a phase change heat storage box. Figure 5 This is a schematic diagram of a phase change heat storage box where the second support plate of the fixed structure is not fixed to the third side.

[0027] Figure 6 A schematic diagram of a structure in a phase change heat storage box where the third support plate of the fixed structure is fixed to the second support plate;

[0028] Figure 7 for Figure 2 An enlarged schematic diagram of point A in the middle;

[0029] Figure 8 This is a schematic diagram of one structure of the double-headed expansion and contraction valve in this utility model;

[0030] Figure 9 This is a cross-sectional view of the dual-head expansion and contraction valve of this utility model;

[0031] In the diagram, 1—solar greenhouse, 2—phase change heat storage box, 21—box body, 22—corrugated heat absorption cover, 23—phase change liquid pipeline, 24—sealing ring, 25—first support plate, 26—second support plate, 27—third support plate, 28—heat insulation board, 29—flexible PVC water bag, 3—data relay, 4—controller, 5—fan, 61—first temperature sensor, 62—second temperature sensor, 63—third temperature sensor, 64—fourth temperature sensor, 65—fifth temperature sensor, 71—first double-headed expansion and contraction valve, 711—valve chamber, 712—first port, 713—second port, 714—expansion pipe, 715—channel switching valve, 72—second double-headed expansion and contraction valve, 81—first shut-off valve, 82—second shut-off valve. Detailed Implementation

[0032] The technical solution of this utility model is described in further detail below with reference to the accompanying drawings, but the scope of protection of this utility model is not limited to the following description.

[0033] like Figure 1 As shown, a phase change heat storage greenhouse includes a solar greenhouse 1, a phase change heat storage box 2, a data relay 3, a controller 4, a fan 5, a first double-headed expansion and contraction valve 71, a second double-headed expansion and contraction valve 72, a first shut-off valve 81, a second shut-off valve 82, an illuminance sensor, a first temperature sensor 61, a second temperature sensor 62, a third temperature sensor 63, a fourth temperature sensor 64, and a fifth temperature sensor 65.

[0034] The solar greenhouse 1 is equipped with a phase change heat storage box 2 and a fan 5.

[0035] The phase change heat storage box 2 has an air inlet and an air outlet. The air inlet of the phase change heat storage box 2 is connected to the first port 712 of the first double-headed expansion and contraction valve 71. The second port 713 of the first double-headed expansion and contraction valve 71 is connected to the air outlet of the fan 5 via the first shut-off valve 81. The air outlet of the phase change heat storage box 2 is connected to the first port 712 of the second double-headed expansion and contraction valve 72. The second port 713 of the second double-headed expansion and contraction valve 72 is connected to the second shut-off valve 82.

[0036] The first temperature sensor 61 is located at the second port 713 of the first double-headed expansion and contraction valve 71, the second temperature sensor 62 is located at the second port 713 of the second double-headed expansion and contraction valve 72, the third temperature sensor 63 is located at the top of the solar greenhouse 1, the fourth temperature sensor 64 is located at the bottom of the solar greenhouse 1, and the fifth temperature sensor 65 is located inside the phase change heat storage box 2.

[0037] The data relay 3 is connected to the controller, the illuminance sensor, the first temperature sensor 61, the second temperature sensor 62, the third temperature sensor 63, the fourth temperature sensor 64, and the fifth temperature sensor 65, respectively.

[0038] The controller 4 is connected to the fan 5, the first shut-off valve 81, the second shut-off valve 82, the first double-headed expansion and contraction valve 71, and the second double-headed expansion and contraction valve 72, respectively.

[0039] In this embodiment, a first double-headed expansion and contraction valve 71 is provided between the air inlet of the phase change heat storage box 2 and the fan 5, which can actively adjust the airflow direction and pressure (compression or expansion) to form a dynamic semi-open cycle and balance heat exchange and air flow.

[0040] In some embodiments of this example, multiple phase change heat storage boxes 2 are sequentially connected to form a group of phase change heat storage boxes 2; in each group of phase change heat storage boxes 2, the air inlet of the first phase change heat storage box 2 is connected to the air outlet of the fan 5, and the air outlet of the preceding phase change heat storage box 2 is connected to the air inlet of the following phase change heat storage box 2. In these embodiments, each group of phase change heat storage boxes 2 corresponds to one fan 5, and the fan 5 exchanges heat with the phase change material through convection when rotating forward.

[0041] In this embodiment, each phase change heat storage box 2 is an independent module that can be installed, replaced, or expanded individually. The phase change heat storage boxes 2 are connected by horizontal pipes and ventilation hoses, supporting the horizontal array arrangement of multiple modules to form a unified ventilation network, reducing construction complexity. Multiple phase change heat storage boxes 2 are evenly distributed horizontally along the rear wall of the solar greenhouse 1 to form a modular array. Combined with the vertically arranged fans 5 and ventilation ducts, this achieves three-dimensional air circulation and eliminates local temperature differences.

[0042] In some implementations of this embodiment, such as Figure 2 As shown, the phase change heat storage box 2 includes a box body 21 with an opening on one side. The opening side of the box body 21 is provided with a corrugated heat-absorbing cover 22 for opening or closing the opening side. The box body 21 is provided with a liquid inlet, a liquid outlet, an air inlet, and an air outlet. A fifth temperature sensor 65 and a phase change liquid pipeline 23 are provided inside the box body 21. The two ends of the phase change liquid pipeline 23 are connected to the liquid inlet and the liquid outlet, respectively. The structure of the corrugated heat-absorbing cover 22 is as follows... Figure 3 As shown.

[0043] In some implementations of this embodiment, such as Figure 4 As shown, the inner wall surface of the box 21 is provided with a heat insulation plate 28, and a flexible PVC water bag 29 is provided on the side of the heat insulation plate 28 away from the inner wall of the box 21.

[0044] In some implementations of this embodiment, such as Figure 5 As shown, the phase change heat storage box 2 also includes a fixing structure, which includes a first support plate 25, a second support plate 26, and a third support plate 27. The first support plate 25 and the second support plate 26 intersect to form an L-shaped structure, and the third support plate 27 is hinged to the side of the second support plate 26 away from the first support plate 25. The first support plate 25 is provided with a plurality of first threaded holes, the side of the second support plate 26 that is hinged to the third support plate 27 is provided with a plurality of second threaded holes, and the third support plate 27 is provided with a plurality of third threaded holes. The second threaded holes and the third threaded holes correspond one-to-one, and the third threaded holes are through holes penetrating the third support plate 27. Wherein, as... Figure 6 As shown, when the third support plate 27 is flipped to the position where the third threaded hole is connected to the corresponding second threaded hole, and the third support plate 27 and the first support plate 25 are located on the same side of the second support plate 26, the first support plate 25, the second support plate 26 and the third support plate 27 form a U-shaped structure, and the box 21 is placed inside the U-shaped structure.

[0045] For example, when the third support plate 27 is flipped to the position where the third threaded hole connects with the corresponding second threaded hole, the third support plate 27 can be fixed on the second support plate 26 by passing screws through the third threaded hole and the second threaded hole in sequence, so as to ensure the stability of the U-shaped structure formed by the first support plate 25, the second support plate 26 and the third support plate 27, so that the box 21 can be installed into the U-shaped structure.

[0046] When the first support plate 25, the second support plate 26 and the third support plate 27 form a U-shaped structure, the third support plate 27 is 4 to 8 cm higher than the second support plate 26.

[0047] In some implementations of this embodiment, such as Figure 7 As shown, the bottom of the housing 21 is provided with an upwardly recessed mounting groove, the width of which is 4 to 10 cm.

[0048] In this embodiment, the process of installing the phase change heat storage box 2 on the solar greenhouse 1 is as follows: the first support plate 25 is connected to the steel frame rear wall of the solar greenhouse 1 by bolts, the box body 21 is placed on the second support plate 26, the second support plate 26 is embedded in the installation groove, then the third support plate 27 is flipped to form a U-shaped structure, and then the third support plate 27 is fixed on the second support plate 26 by screws.

[0049] In some embodiments of this example, the inlet and outlet of the housing 21 are equipped with rotary outlet control valves.

[0050] In some embodiments of this example, a sealing ring 24 is provided on the inner wall of the opening surface of the box 21, and the sealing ring 24 is a heat-resistant foam rubber ring.

[0051] In some embodiments of this example, the corrugated heat-absorbing cover 22 is provided with a heat-absorbing coating on the side facing away from the housing 21, and the thickness of the heat-absorbing coating is generally less than 3mm.

[0052] In this embodiment, the corrugated heat absorption cover 22 can be fixed to the box 21 by an L-shaped thin sheet buckle, which ensures both airtightness and ease of disassembly and maintenance.

[0053] In this embodiment, the corrugated heat-absorbing cover 22 is hinged to the opening surface of the box 21 and has a heat-absorbing coating on its surface. This allows for efficient heat absorption and release, and also enables air circulation through the air inlet and outlet on the box 21, avoiding the temperature gradient problem caused by complete sealing.

[0054] In some implementations of this embodiment, such as Figure 8 and Figure 9 As shown, the structure of the second dual-head expansion and contraction valve 72 is the same as that of the first dual-head expansion and contraction valve 71. The first dual-head expansion and contraction valve 71 includes a valve cavity 711, a first port 712 and a second port 713 on the valve cavity 711. The valve cavity 711 is provided with a straight first channel and a curved second channel. An expansion tube 714 is provided in the second channel. The two ends of the first channel are connected to the first port 712 and the second port 713 respectively. The two ends of the second channel are connected to the first port 712 and the second port 713 respectively. The valve cavity 711 is provided with a channel switching valve 715 for switching the first channel or the second channel.

[0055] When air enters through the first valve port, passes directly through the valve chamber 711, and exits through the second valve port, the nature of the air remains unchanged. When air enters through the first valve port, passes through the channel switching valve 715 and the expansion pipe 714, and exits through the second valve port, it is compressed into high-temperature and high-pressure gas. When air enters through the second valve port, passes directly through the valve chamber 711, and exits through the first valve port, the nature of the air remains unchanged. When air enters through the second valve port, passes through the channel switching valve 715 and the expansion pipe 714, and exits through the first valve port, it is depressurized into low-temperature and high-pressure gas.

[0056] In this embodiment, the controller 4 adjusts the speed of the fan 5 and the path switching of the dual-head expansion and contraction valve according to the information collected by the data relay 3. When the dual-head expansion and contraction valve is in a straight-through state, it does not change the ventilation volume or wind speed characteristics. When it is in an expansion or contraction bend, it can expand or compress the airflow, so that the airflow changes from high temperature and high pressure to low temperature and low pressure or from high temperature and high pressure to low temperature and low pressure.

[0057] One working principle of the greenhouse in this embodiment is as follows:

[0058] When the illuminance is less than the first preset value, the controller 4 closes the first shut-off valve 81 and the second shut-off valve 82; when the illuminance is greater than or equal to the first preset value and less than or equal to the second preset value, the controller 4 opens the first shut-off valve 81 and the second shut-off valve 82, the first double-headed expansion and contraction valve 71 is in a bent-through compression state, and the second double-headed expansion and contraction valve 72 is in a straight-through state, and the controller 4 controls the fan 5 to direct warm air into the phase change heat storage box 2 at a wind speed of 3-5 m / s, so as to utilize solar energy to heat the greenhouse and store heat energy; when the illuminance is greater than the second preset value, the controller 4 opens the first shut-off valve 81 and the second shut-off valve 82, the first double-headed expansion and contraction valve 71 is in a straight-through state, and the second double-headed expansion and contraction valve 72 is in a bent-through compression state, and controls the fan 5 to direct hot air into the phase change heat storage box 2 at a wind speed of 6-8 m / s, so as to utilize solar energy to heat the greenhouse and store heat energy. The first preset value is greater than or equal to 8000 lx and less than the second preset value, and the second preset value is less than 2000 lx.

[0059] During the daytime, controller 4 determines whether to activate phase change heat storage box 2 based on the detection result of fifth temperature sensor 65 to cool and store heat for the solar greenhouse 1. When the temperature detected by fifth temperature sensor 65 is lower than the third preset value, controller 4 activates phase change heat storage box 2; when the temperature detected by fifth temperature sensor 65 is greater than or equal to the third preset value, controller 4 deactivates phase change heat storage box 2. When phase change heat storage box 2 is deactivated, controller 4 closes first shut-off valve 81 and second shut-off valve 82, activates the external channel circuit of fan 5, and controls fan 5 to extract hot air from the solar greenhouse 1 at a wind speed of 5-7 m / s for external circulation. The third preset value is greater than or equal to 35℃ and less than or equal to 42℃.

[0060] Under nighttime conditions, controller 4 determines whether to activate phase change heat storage box 2 based on the temperature inside greenhouse 1 to supplement heat to greenhouse 1. When the temperature of greenhouse 1 is lower than a fourth preset value, controller 4 opens the first shut-off valve 81 and the second shut-off valve 82. The first double-headed expansion and contraction valve 71 is in a straight-through state, and the second double-headed expansion and contraction valve 72 is in a bend-through expansion state. The controller adjusts the fan 5 to a speed of 2-3 m / s to introduce cold air into the phase change heat storage box 2 to release warm air to supplement heat to greenhouse 1. When the temperature of greenhouse 1 is greater than or equal to the fourth preset value, controller 4 closes the first shut-off valve 81 and the second shut-off valve 82, shuts off the phase change heat storage box 2, and no heat supplementation is needed for greenhouse 1. The fourth preset value is greater than or equal to 14℃ and less than 20℃. The temperature inside the solar greenhouse 1 is the weighted average of the detection results of the third temperature sensor 63 and the fourth temperature sensor 64. For example, the weight of the third temperature sensor 63 is 0.6 and the weight of the fourth temperature sensor 64 is 0.4.

[0061] Under nighttime conditions, when the phase change heat storage box 2 is turned on, the controller 4 determines whether to turn it off based on the detection result of the fifth temperature sensor 65. If the detection result of the fifth sensor is greater than or less than a fifth preset value, the controller shuts off the phase change heat storage box 2, eliminating the need to release heat to the solar greenhouse 1. If the detection result of the fifth temperature sensor 65 is greater than or equal to the fifth preset value, the controller shuts off the phase change heat storage box 2 to release heat to the solar greenhouse 1. The fifth preset value is greater than or equal to 5℃ and less than 10℃.

[0062] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A phase change heat storage greenhouse, characterized in that, It includes a solar greenhouse, a phase change heat storage box, a data relay, a controller, a fan, a first double-headed expansion and contraction valve, a second double-headed expansion and contraction valve, a first shut-off valve, a second shut-off valve, an illuminance sensor, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, and a fifth temperature sensor. The solar greenhouse is equipped with a phase change heat storage box and a fan; The air inlet of the phase change heat storage box is connected to the first port of the first double-headed expansion and contraction valve, the second port of the first double-headed expansion and contraction valve is connected to the air outlet of the fan via the first shut-off valve, the air outlet of the phase change heat storage box is connected to the first port of the second double-headed expansion and contraction valve, and the second port of the second double-headed expansion and contraction valve is connected to the second shut-off valve. The first temperature sensor is located at the second port of the first double-headed expansion and contraction valve, the second temperature sensor is located at the second port of the second double-headed expansion and contraction valve, the third temperature sensor is located at the top of the solar greenhouse, the fourth temperature sensor is located at the bottom of the solar greenhouse, and the fifth temperature sensor is located inside the phase change heat storage box. The data relay is connected to the controller, the illuminance sensor, the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, and the fifth temperature sensor, respectively. The controller is connected to the fan, the first shut-off valve, the second shut-off valve, the first double-headed expansion and contraction valve, and the second double-headed expansion and contraction valve, respectively.

2. The phase change heat storage greenhouse according to claim 1, characterized in that, Multiple phase change heat storage boxes are connected in sequence to form a group of phase change heat storage boxes; in each group of phase change heat storage boxes, the air inlet of the first phase change heat storage box is connected to the air outlet of the fan, and the air outlet of the previous phase change heat storage box is connected to the air inlet of the next phase change heat storage box.

3. A phase change heat storage greenhouse according to claim 1, characterized in that, The phase change heat storage box includes a box body with an opening on one side. The opening side of the box body is provided with a corrugated heat absorption cover for opening or closing the opening side. The box body is provided with a liquid inlet, a liquid outlet, an air inlet, and an air outlet. The box body is provided with a fifth temperature sensor and a phase change liquid pipeline. The two ends of the phase change liquid pipeline are connected to the liquid inlet and the liquid outlet, respectively.

4. A phase change heat storage greenhouse according to claim 3, characterized in that, The phase change heat storage box also includes a fixing structure, which includes a first support plate, a second support plate and a third support plate. The first support plate and the second support plate intersect to form an L-shaped structure, and the third support plate is hinged to the side of the second support plate away from the first support plate. The first support plate is provided with a number of first threaded holes, the side of the second support plate that is hinged to the third support plate is provided with a number of second threaded holes, and the third support plate is provided with a number of third threaded holes. When the third support plate is flipped to the position where the third threaded hole connects with the corresponding second threaded hole, and the third support plate and the first support plate are on the same side of the second support plate, the first support plate, the second support plate and the third support plate form a U-shaped structure, and the box is placed inside the U-shaped structure.

5. A phase change heat storage greenhouse according to claim 3, characterized in that, The inner wall surface of the box is provided with a heat insulation board, and a flexible PVC water bladder is provided on the side of the heat insulation board away from the inner wall of the box.

6. A phase change heat storage greenhouse according to claim 3, characterized in that, The inlet and outlet of the tank are equipped with rotary outlet control valves.

7. A phase change heat storage greenhouse according to claim 3, characterized in that, A sealing ring is provided on the inner wall of the opening side of the box.

8. A phase change heat storage greenhouse according to claim 7, characterized in that, The sealing ring is a heat-resistant foam rubber ring.

9. A phase change heat storage greenhouse according to claim 3, characterized in that, The corrugated heat-absorbing cover has a heat-absorbing coating on the side facing away from the box.

10. A phase change heat storage greenhouse according to claim 1, characterized in that, The structure of the second dual-head expansion and contraction valve is the same as that of the first dual-head expansion and contraction valve. The first dual-head expansion and contraction valve includes a valve cavity, a first port and a second port on the valve cavity, a straight first channel and a curved second channel in the valve cavity, an expansion tube in the second channel, the two ends of the first channel are connected to the first port and the second port respectively, and the two ends of the second channel are connected to the first port and the second port respectively. The valve cavity is provided with a channel switching valve for switching the first channel or the second channel.

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