Movable heat pump type constant-temperature water tank for experiment

Abstract

The utility model provides a movable heat pump type constant-temperature water tank for an experiment. The movable heat pump type constant-temperature water tank comprises a compressor, a four-way valve, a first condenser, a throttling valve, an evaporator, a first water tank body, a water pump and a thermostat, the compressor, the four-way valve, the first condenser, the throttling valve and the evaporator are sequentially connected in series in a closed loop mode to form a first refrigerant circulation flow path. The first condenser is arranged in the first water tank body and is used for exchanging heat with water in the first water tank body; the water pump communicates with the first water tank body and is used for pumping water from the first water tank body and supplying water outwards; the thermostat is arranged on a water outlet flow path of the water pump or between the first water tank body and the water pump and used for conducting heat exchange with water flowing out of the first water tank body so that the water temperature can be controlled within a set range. Through the arrangement, the temperature of water in the water tank is controlled through the heat pump and the thermostat, so that the water temperature is more accurately controlled, and meanwhile, the energy consumption is reduced. In addition, the water tank is easier to operate independently and can be manufactured into movable experimental heat pump type constant-temperature water tank equipment.

Description

Technical Field

[0001] This utility model relates to the field of agricultural technology, and in particular to a portable heat pump constant temperature water tank for experimental use. Background Technology

[0002] Existing laboratory constant temperature water tanks mostly use electric heating wires for heating and refrigeration units for cooling and temperature control. The main problems with this method are:

[0003] 1. The temperature fluctuates greatly, and there is a control gap in the coordination between the heating wire and the cooling unit, making temperature control difficult;

[0004] 2. Reliance on a single electric heating element results in high energy consumption and low energy efficiency.

[0005] In addition, existing laboratory constant temperature water tanks are usually designed to be integrated with the experimental equipment, resulting in a fixed tank structure that requires placement with dedicated experimental equipment, making them inconvenient to move and unable to meet the needs of experiments in multiple scenarios. Utility Model Content

[0006] Based on the above, a portable heat pump type constant temperature water tank for experiments is provided. The water temperature in the tank is controlled by a heat pump and a thermostat, thereby controlling the water temperature more accurately and reducing energy consumption.

[0007] A portable heat pump-type constant temperature water tank for experimental use includes a compressor, a four-way valve, a first condenser, a throttling valve, an evaporator, a first water tank, a water pump, and a thermostat. The compressor, the four-way valve, the first condenser, the throttling valve, and the evaporator are connected in a closed loop to form a first refrigerant circulation path. The first condenser is disposed in the first water tank for heat exchange with the water in the first water tank. The water pump is connected to the first water tank for pumping water from the first water tank and supplying it to the outside. The thermostat is disposed on the outlet flow path of the water pump or between the first water tank and the water pump for heat exchange with the water flowing out of the first water tank to control the water temperature within a set range. This configuration, through the heat pump and thermostat, allows for more precise temperature control of the water in the tank while reducing energy consumption. Furthermore, this water tank is easier to operate independently, making it a portable experimental heat pump-type constant temperature water tank device.

[0008] In one embodiment, the first water tank includes an inner liner and an outer shell; the inner liner serves as a container for holding water, the outer shell is disposed outside the inner liner, and a phase change material is filled between the inner liner and the outer shell; the inner liner is made of a material that is a good conductor of heat.

[0009] In one embodiment, a partition is further provided between the inner liner and the outer shell; the phase change material is filled between the partition and the inner liner; the space between the partition and the outer shell is a heat insulation layer filled with heat insulation material, so as to reduce the temperature of the outer shell while keeping it warm and preventing burns to the user.

[0010] In one embodiment, the first condenser is disposed in the inner liner, and a first refrigerant connection pipe is provided at one end of the refrigerant flow path of the first condenser, and a second refrigerant connection pipe is provided at the other end; the first refrigerant connection pipe and the second refrigerant connection pipe pass through the inner liner wall and are sealed and fixedly connected to the inner liner wall; the first refrigerant connection pipe and the second refrigerant connection pipe pass through the outer shell and are sealed and fixedly connected to the outer shell.

[0011] In one embodiment, the first water tank is provided with a return pipe for water inlet and a water outlet pipe for water outlet, and the water pump inlet is connected to the water outlet pipe; the return pipe and the water outlet pipe penetrate the inner liner wall and the outer shell to connect the inner liner with the external environment, and are sealed and fixedly connected to the inner liner wall and the outer shell; the water outlet pipe is located at one end in the inner liner near the bottom of the inner liner.

[0012] In one embodiment, an exhaust valve assembly is further included; the exhaust valve assembly includes a valve and an exhaust pipe connecting the inner liner to the external environment, the exhaust pipe penetrating the inner liner wall and the outer shell, and being sealed and fixedly connected to the inner liner wall and the outer shell; the valve is used to control the opening and closing of the exhaust pipe to control the pressure inside the inner liner within a set threshold.

[0013] In one embodiment, the system further includes a second condenser, a second water tank, a first solenoid valve, a second solenoid valve, and a three-way valve; the compressor, the four-way valve, the evaporator, the throttling valve, and the second condenser are connected in a closed loop to form a second refrigerant circulation path; the second condenser is disposed in the second water tank for heat exchange with the water in the second water tank; the first solenoid valve is disposed on the refrigerant pipeline at the inlet or outlet of the first condenser, and the second solenoid valve is disposed on the refrigerant pipeline at the inlet or outlet of the second condenser; by opening and closing the first solenoid valve and the second solenoid valve, the refrigerant can be selected to flow through the first condenser or the second condenser; one inlet of the three-way valve is connected to the first water tank, the other inlet is connected to the second water tank, and the outlet is connected to the inlet of the water pump.

[0014] In one embodiment, a first return valve and an outlet valve are also included; the first return valve is connected to the inner tank of the first water tank through the return pipe, and is used to control the on / off of water inlet and / or water inlet speed of the inner tank; the outlet valve is installed on the pipeline at the outlet end of the water pump, and is used to control the on / off of water outlet and / or water outlet speed.

[0015] In one embodiment, a second return valve is also included; the second return valve is connected to the second water tank and is used to control the on / off state of water entering the second water tank and / or the water entering speed.

[0016] In one embodiment, the system further includes a housing, a control panel, a water outlet, and a water return outlet disposed on the housing; the housing is disposed on the upper part of the first water tank body, or covers the entire first water tank body; it also includes casters, wherein when the housing is disposed on the upper part of the first water tank body, the casters are disposed at the bottom of the first water tank body and connected to the first water tank body, and when the housing covers the entire first water tank body, the casters are disposed at the bottom of the housing body and connected to the housing body; the water outlet is connected to the thermostat, and the water return outlet is connected to the inner tank; the control panel is used to set and control the system operating parameters of the water tank.

[0017] In one embodiment, the housing also includes a partition mounting plate and a temperature sensor; the partition mounting plate divides the housing into upper and lower mounting spaces, the upper space is used to install the compressor, four-way valve, evaporator, throttle valve and thermostat, and the lower space is used to install the first water tank; the temperature sensor is used to measure the water temperature in the first water tank.

[0018] In one embodiment, one end of the temperature sensor is fixedly mounted on the partition mounting plate.

[0019] In one embodiment, the evaporator is an air heat exchanger for exchanging heat with air; it also includes a fan for circulating air in the space where the evaporator is located to enhance the heat exchange effect.

[0020] In one embodiment, the first condenser is located at the bottom of the first water tank.

[0021] In one embodiment, the thermostat is equipped with a phase change material, which exchanges heat with the water flowing out of the first water tank through a phase change of the material.

[0022] In one embodiment, the thermostat is equipped with an electric heating module.

[0023] In one embodiment, the thermostat is disposed on the compressor to absorb waste heat from the compressor.

[0024] In one embodiment, the inner liner and the outer shell are made of stainless steel.

[0025] In one embodiment, the partition is made of a material that is a poor conductor of heat.

[0026] In one embodiment, the first refrigerant flow path is used to produce hot water, and the second refrigerant flow path is used to produce chilled water.

[0027] In one embodiment, the first water tank and the second water tank have the same structure.

[0028] In one embodiment, the first water tank and the second water tank have the same specifications.

[0029] In one embodiment, a gas-liquid separator is also provided in the refrigerant flow path of the compressor, that is, in the refrigerant flow path between the four-way valve and the compressor inlet.

[0030] In one embodiment, the throttle valve is an electronic expansion valve.

[0031] In one embodiment, the temperature sensor includes a thermocouple thermometer.

[0032] In one embodiment, the insulation layer is filled with an insulation material based on aerogel and photonic crystal metamaterials. With this configuration, even if the internal temperature of the water tank is around 80°C, the surface temperature of the outer shell remains below 40°C.

[0033] In one embodiment, the insulation layer may also be a vacuum layer to prevent condensation from forming on the insulation layer when cooling water.

[0034] In one embodiment, the phase change material is a nanocomposite phase change material. Specifically, the phase change material can be a paraffin / graphene composite material, which achieves temperature fluctuations of <±0.03℃ through latent heat absorption / release, equivalent to 10 times the accuracy of a traditional PID controller. Furthermore, it can maintain its temperature for over 8 hours without external heat / cold source input, i.e., after power failure, reducing energy consumption.

[0035] In one embodiment, the outlet and / or return outlet adopt a modular interface to enable one constant temperature water tank to serve multiple experimental devices simultaneously.

[0036] The aforementioned portable heat pump-type constant temperature water tank for laboratory use employs a heat pump and thermostat to control the water temperature within the tank, thereby achieving more precise temperature control and reducing energy consumption. Furthermore, this water tank is easier to operate independently, allowing for the manufacture of portable experimental heat pump-type constant temperature water tank equipment. Specifically, by integrating cooling and heating through heat pump technology, the energy efficiency ratio can be increased to over 3.0 compared to traditional constant temperature water tanks, resulting in energy savings of 40%-60%. Attached Figure Description

[0037] Figure 1 A schematic diagram of the water tank refrigerant and water circuit system structure for a single water tank body provided for one or more embodiments;

[0038] Figure 2 A schematic diagram of a water tank structure provided for one or more embodiments;

[0039] Figure 3 An enlarged structural schematic diagram of part A of the water tank provided for one or more embodiments;

[0040] Figure 4 A schematic diagram of the water tank refrigerant and water circuit system structure for one or more embodiments;

[0041] Figure 5 A schematic diagram of the component layout of a water tank refrigerant system provided for one or more embodiments;

[0042] Figure 6 A schematic diagram showing the arrangement of the water tank shell and refrigerant system components for one or more embodiments.

[0043] Explanation of reference numerals in the attached drawings: 110. Compressor; 120. Four-way valve; 131. First condenser; 132. Second condenser; 140. Throttling valve; 150. Evaporator; 160. Gas-liquid separator; 171. First solenoid valve; 172. Second solenoid valve; 200. Fan; 300. First water tank; 310. Inner liner; 320. Outer shell; 330. Phase change material; 340. Baffle plate; 350. Insulation layer; 361. First refrigerant 362. Second refrigerant connection pipe; 371. Return water pipe; 372. Outlet water pipe; 380. Air vent assembly; 410. Water pump; 420. Thermostat; 430. Outlet water valve; 441. First return water valve; 442. Second return water valve; 450. Three-way valve; 500. Second water tank; 600. Control panel; 700. Temperature sensor; 800. Casters; 900. Housing; 910. Outlet water; 920. Return water outlet. Detailed Implementation

[0044] In this patent document, the following is discussed Figure 1-6The various embodiments used to describe the principles or methods of this disclosure are for illustrative purposes only and should not be construed as limiting the scope of this disclosure in any way. Preferred embodiments of this disclosure will be described below with reference to the accompanying drawings. In the following description, detailed descriptions of well-known functions or configurations will be omitted to avoid obscuring the subject matter of this disclosure with unnecessary detail. Furthermore, the terminology used herein will be defined according to the functional definition of this utility model. Therefore, the terminology may vary depending on the intention or usage of the user or operator. Consequently, the terminology used herein must be understood based on the descriptions made herein.

[0045] A portable heat pump type constant temperature water tank for experiments, such as Figure 1 As shown, the system includes a compressor 110, a four-way valve 120, a first condenser 131, a throttle valve 140, an evaporator 150, a first water tank 300, a water pump 410, and a thermostat 420. The compressor 110, four-way valve 120, first condenser 131, throttle valve 140, and evaporator 150 are connected in a closed loop to form a first refrigerant circulation path. The first condenser 131 is located in the first water tank 300 and is used for heat exchange with the water in the first water tank 300. The water pump 410 is connected to the first water tank 300 and is used to draw water from the first water tank 300 for external water supply. The thermostat 420 is located on the outlet flow path of the water pump 410 or between the first water tank 300 and the water pump 410, and is used to exchange heat with the water flowing out of the first water tank 300 to control the water temperature within a set range. This configuration, using a heat pump and thermostat 420 to control the water temperature in the tank, allows for more precise temperature control while reducing energy consumption. Furthermore, this water tank is easier to operate independently, enabling the manufacture of a portable experimental heat pump-type constant-temperature water tank.

[0046] In one embodiment, the thermostat 420 is provided with a phase change material 330, which exchanges heat with the water flowing out of the first water tank 300 through a phase change of the material.

[0047] In one embodiment, the thermostat 420 is provided with an electric heating module.

[0048] In one embodiment, a thermostat 420 is disposed on the compressor 110 to absorb waste heat from the compressor 110.

[0049] In one embodiment, such as Figure 2 Figure 3 As shown, the first water tank 300 includes an inner liner 310 and an outer shell 320. The inner liner 310 serves as a container for holding water, and the outer shell 320 is disposed outside the inner liner 310, with a phase change material 330 filling the space between the inner liner 310 and the outer shell 320. The inner liner 310 is made of a material that is a good conductor of heat.

[0050] In one embodiment, such as Figure 2 Figure 3 As shown, a partition 340 is also provided between the inner liner 310 and the outer shell 320. Phase change material 330 is filled between the partition 340 and the inner liner 310. The space between the partition 340 and the outer shell 320 is a heat insulation layer 350, which is filled with heat insulation material to reduce the temperature of the outer shell 320 while keeping it warm, thus preventing burns to the user.

[0051] In one embodiment, such as Figure 2 As shown, a first condenser 131 is disposed in an inner liner 310. A first refrigerant connecting pipe 361 is provided at one end of the refrigerant flow path of the first condenser 131, and a second refrigerant connecting pipe 362 is provided at the other end. The first refrigerant connecting pipe 361 and the second refrigerant connecting pipe 362 pass through the wall of the inner liner 310 and are sealed and fixedly connected to the wall of the inner liner 310. The first refrigerant connecting pipe 361 and the second refrigerant connecting pipe 362 pass through an outer shell 320 and are sealed and fixedly connected to the outer shell 320.

[0052] In one embodiment, such as Figure 1 Figure 2 As shown, the first water tank 300 is equipped with a return pipe 371 for water inlet and a water outlet pipe 372 for water outlet. The water pump 410's inlet is connected to the water outlet pipe 372. The return pipe 371 and the water outlet pipe 372 penetrate the inner tank 310 wall and the outer shell 320, connecting the inner tank 310 to the external environment, and are sealed and fixedly connected to the inner tank 310 wall and the outer shell 320. The water outlet pipe 372 is located at one end in the inner tank 310 near the bottom of the inner tank 310.

[0053] In one embodiment, such as Figure 2 As shown, it also includes an exhaust valve assembly 380. The exhaust valve assembly 380 includes a valve and an exhaust pipe connecting the inner liner 310 to the external environment. The exhaust pipe penetrates the wall of the inner liner 310 and the outer shell 320, and is sealed and fixedly connected to the wall of the inner liner 310 and the outer shell 320. The valve is used to control the opening and closing of the exhaust pipe to control the pressure inside the inner liner 310 within a set threshold.

[0054] In one embodiment, the inner liner 310 and the outer shell 320 are made of stainless steel.

[0055] In one embodiment, such as Figure 4As shown, it also includes a second condenser 132, a second water tank 500, a first solenoid valve 171, a second solenoid valve 172, and a three-way valve 450. The compressor 110, four-way valve 120, evaporator 150, throttle valve 140, and second condenser 132 are connected in a closed loop to form a second refrigerant circulation path. The second condenser 132 is located in the second water tank 500 and is used for heat exchange with the water in the second water tank 500. The first solenoid valve 171 is located on the refrigerant pipeline at either the inlet or outlet end of the first condenser 131, and the second solenoid valve 172 is located on the refrigerant pipeline at either the inlet or outlet end of the second condenser 132. By opening and closing the first solenoid valve 171 and the second solenoid valve 172, the refrigerant can be selected to flow through either the first condenser 131 or the second condenser 132. One of the inlets of the three-way valve 450 is connected to the first water tank 300, the other inlet is connected to the second water tank 500, and the outlet 910 is connected to the inlet of the water pump 410.

[0056] In one embodiment, such as Figure 1 Figure 4 As shown, a gas-liquid separator 160 is also provided in the refrigerant flow path of the compressor 110, that is, in the refrigerant flow path between the four-way valve 120 and the air inlet of the compressor 110.

[0057] In one embodiment, the throttle valve 140 is an electronic expansion valve.

[0058] In one embodiment, such as Figure 1 Figure 4 As shown, it also includes a first return water valve 441 and a water outlet valve 430. The first return water valve 441 is connected to the inner tank 310 of the first water tank 300 through a return water pipe 371, and is used to control the on / off of water entering the inner tank 310 and / or the water entering speed. The water outlet valve 430 is installed on the pipeline at the water outlet end of the water pump 410, and is used to control the on / off of water exiting and / or the water exit speed.

[0059] In one embodiment, such as Figure 4 As shown, it also includes a second return water valve 442. The second return water valve 442 is connected to the second water tank 500 and is used to control the on / off of water inlet to the second water tank 500 and / or the water inlet speed.

[0060] In one embodiment, such as Figure 6As shown, the system also includes a housing 900, a control panel 600, a water outlet 910, and a water return outlet 920 mounted on the housing 900. The housing 900 is located on the upper part of the first water tank 300, or covers the entire first water tank 300. It also includes casters 800. When the housing 900 is located on the upper part of the first water tank 300, the casters 800 are located at the bottom of the first water tank 300 and connected to it. When the housing 900 covers the entire first water tank 300, the casters 800 are located at the bottom of the housing 900 and connected to it. The water outlet 910 is connected to the thermostat 420, and the water return outlet 920 is connected to the inner tank 310. The control panel 600 is used to set and control the system operating parameters of the water tank.

[0061] In one embodiment, such as Figure 5 Figure 6 As shown, it also includes a partition mounting plate (not shown) and a temperature sensor 700. The partition mounting plate divides the housing 900 into upper and lower mounting spaces. The upper space is used to install the compressor 110, four-way valve 120, evaporator 150, throttle valve 140, and thermostat 420, while the lower space is used to install the first water tank 300. The temperature sensor 700 is used to measure the water temperature inside the first water tank 300.

[0062] In one embodiment, such as Figure 5 As shown, one end of the temperature sensor 700 is fixedly mounted on the partition mounting plate.

[0063] In one embodiment, such as Figure 5 As shown, the evaporator 150 is an air heat exchanger used for exchanging heat with air. It also includes a fan 200, which circulates air within the space containing the evaporator 150 to enhance the heat exchange effect.

[0064] In one embodiment, such as Figure 6 As shown, the first condenser 131 is located at the bottom of the first water tank 300.

[0065] In one embodiment, the partition 340 is made of a material that is a poor conductor of heat.

[0066] In one embodiment, the first refrigerant flow path is used to produce hot water, and the second refrigerant flow path is used to produce chilled water.

[0067] In one embodiment, the first water tank 300 and the second water tank 500 have the same structure.

[0068] In one embodiment, the first water tank 300 and the second water tank 500 have the same specifications.

[0069] In one embodiment, the first water tank 300 is used as a hot water tank, and the second water tank 500 is used as a cold water tank.

[0070] In one embodiment, the temperature sensor 700 includes a thermocouple thermometer.

[0071] In one embodiment, the insulation layer 350 is filled with an insulation material based on aerogel and photonic crystal metamaterials. With this configuration, even if the internal temperature of the water tank is around 80°C, the surface temperature of the outer shell 320 remains below 40°C.

[0072] In one embodiment, the insulation layer 350 may also be a vacuum layer to prevent condensation from forming on the insulation layer 350 when cooling water.

[0073] In one embodiment, the phase change material 330 is a nanocomposite phase change material 330. Specifically, the phase change material 330 can be a paraffin / graphene composite material, which achieves temperature fluctuations of <±0.03℃ through latent heat absorption / release, equivalent to 10 times the accuracy of a traditional PID controller. At the same time, it can maintain its temperature for more than 8 hours without external heat / cold source input, i.e., after power failure, thus reducing energy consumption.

[0074] In one embodiment, the outlet 910 and / or return outlet 920 adopt a modular interface to enable one constant temperature water tank to serve multiple experimental devices simultaneously.

[0075] The aforementioned portable heat pump-type constant temperature water tank for laboratory use employs a heat pump and thermostat 420 to control the water temperature within the tank, thereby achieving more precise temperature control and reducing energy consumption. Furthermore, this water tank is easier to operate independently, allowing for the manufacture of portable experimental heat pump-type constant temperature water tank equipment. Specifically, by integrating cooling and heating through heat pump technology, compared to traditional constant temperature water tanks, the energy efficiency ratio can be increased to over 3.0, resulting in energy savings of 40%-60%.

[0076] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A portable heat pump type constant temperature water tank for experiments, characterized by, The compressor, the four-way valve, the first condenser, the throttling valve, the evaporator, the first water tank, the water pump and the thermostat are sequentially connected in series to form a first refrigerant circulation flow path. The first condenser is arranged in the first water tank and used for heat exchange with water in the first water tank. The water pump is communicated with the first water tank and used for pumping water from the first water tank to supply water externally. The thermostat is arranged on a water outlet flow path of the water pump or between the first water tank and the water pump and used for heat exchange with water flowing out of the first water tank to control the water temperature within a set range.

2. The movable heat pump type constant temperature water tank for experiments according to claim 1, wherein the first water tank comprises an inner tank and an outer shell. The inner tank is used as a water container, the outer shell is arranged outside the inner tank, and a phase change material is filled between the inner tank and the outer shell. The inner tank is made of a good thermal conductor material.

3. The movable heat pump type constant temperature water tank for experiments according to claim 2, wherein a partition plate is further arranged between the inner tank and the outer shell. The phase change material is filled between the partition plate and the inner tank. The partition plate and the outer shell are a heat insulation layer filled with a heat insulation material to keep warm and reduce the temperature of the outer shell to prevent users from being scalded.

4. The movable heat pump type constant temperature water tank for experiments according to claim 2, wherein the first condenser is arranged in the inner tank, one end of a first refrigerant connecting pipe of the first condenser is arranged, and the other end of a second refrigerant connecting pipe is arranged. The first refrigerant connecting pipe and the second refrigerant connecting pipe penetrate the inner tank wall and are sealingly and fixedly connected with the inner tank wall. The first refrigerant connecting pipe and the second refrigerant connecting pipe penetrate the outer shell and are sealingly and fixedly connected with the outer shell.

5. The movable heat pump type constant temperature water tank for experiments according to any one of claims 2-4, wherein the first water tank is provided with a backwater pipe for water inlet and a water outlet pipe for water outlet, and a water inlet of the water pump is communicated with the water outlet pipe. The backwater pipe and the water outlet pipe penetrate the inner tank wall and the outer shell to communicate the inner tank with the external environment and are sealingly and fixedly connected with the inner tank wall and the outer shell. One end of the water outlet pipe located in the inner tank is close to the bottom of the inner tank.

6. The movable heat pump type constant temperature water tank for experiments according to any one of claims 2-4, further comprising an exhaust valve assembly. The exhaust valve assembly comprises a valve and an exhaust pipe communicated with the inner tank and the external environment, the exhaust pipe penetrates the inner tank wall and the outer shell and is sealingly and fixedly connected with the inner tank wall and the outer shell. The valve is used to control the opening and closing of the exhaust pipe to control the pressure in the inner tank within a set threshold.

7. The movable heat pump type constant temperature water tank for experiments according to claim 1, ​ ​ ​ ​ ​ ​ The second condenser, the second water tank, the first electromagnetic valve, the second electromagnetic valve and the three-way valve are further included. The compressor, the four-way valve, the evaporator, the throttling valve and the second condenser are connected in series in a closed loop to form a second refrigerant circulation flow path. The second condenser is arranged in the second water tank to exchange heat with water in the second water tank. The first electromagnetic valve is arranged on a refrigerant pipeline at an inlet end or an outlet end of the first condenser, and the second electromagnetic valve is arranged on a refrigerant pipeline at an inlet end or an outlet end of the second condenser, so that the refrigerant can flow through the first condenser or the second condenser by opening and closing of the first electromagnetic valve and the second electromagnetic valve. One water inlet of the three-way valve is communicated with the first water tank, another water inlet is communicated with the second water tank, and a water outlet is communicated with a water inlet of the water pump.

8. The mobile heat pump type constant temperature water tank for experiments according to claim 5, further comprising a first backwater valve and a water outlet valve. The first backwater valve is communicated with the inner container of the first water tank through the backwater pipe to control the on-off and / or water inflow speed of the inner container. The water outlet valve is arranged on a pipeline at an outlet end of the water pump to control the on-off and / or water outflow speed.

9. The mobile heat pump type constant temperature water tank for experiments according to claim 2, further comprising a shell, a control panel, a water outlet and a backwater outlet arranged on the shell. The shell is arranged on an upper portion of the first water tank or covers the entire first water tank. Universal wheels are further included, which are arranged on a bottom of the first water tank and connected with the first water tank when the shell is arranged on the upper portion of the first water tank, and which are arranged on a bottom of the shell and connected with the shell when the shell covers the entire first water tank. The water outlet is communicated with the thermostat, and the backwater outlet is communicated with the inner container. The control panel is used to set and control system operation parameters of the water tank.

10. The mobile heat pump type constant temperature water tank for experiments according to claim 9, further comprising a partition installation plate and a temperature sensor. The partition installation plate divides the shell into upper and lower installation spaces, the upper space is used to install the compressor, the four-way valve, the evaporator, the throttling valve and the thermostat, and the lower space is used to install the first water tank. The temperature sensor is used to measure the water temperature in the first water tank. ​ ​ ​

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