Constant temperature water supply equipment suitable for bidirectional working condition test of heat pump

Abstract

The utility model provides a kind of constant temperature water supply equipment suitable for heat pump bidirectional working condition test belongs to heat pump test technical field, and this equipment includes cabinet shell, cabinet shell includes two layers of cavity, upper cavity is integrated with refrigerating unit in, lower cavity is integrated with water storage tank and infusion pipeline, water storage tank is equipped with heater assembly, infusion pipeline includes inner circulation pipeline and outer circulation pipeline, inner circulation pipeline is communicated with refrigerating unit and water storage tank, outer circulation pipeline is communicated with water storage tank, and pipeline interface connected with test heat pump is equipped on this outer circulation pipeline;The equipment integrates cold, hot water supply mechanism in cabinet shell, and the degree of integration is high, and floor space is small, simultaneously, using a water storage tank and two-way circulation pipeline can realize the automatic switching of cold, hot water supply, without setting independent hot water tank and cold water tank, in addition, cold hot hedging mode is used for constant temperature compensation control, can improve cold hot switching rate, and improve temperature stability and effective temperature control range.

Description

Technical Field

[0001] This utility model belongs to the field of heat pump testing technology, and in particular relates to a constant temperature water supply device suitable for testing the bidirectional operating conditions of heat pumps. Background Technology

[0002] A constant temperature water supply system is a high-precision device that can provide and maintain a constant temperature water flow. It is not a standalone product, but a key auxiliary device that creates a stable temperature heat source for other equipment or experiments.

[0003] A heat pump unit is a device that "pumps" heat from a low-temperature heat source to a high-temperature heat source. It typically includes both cooling and heating modes, i.e., it adopts a two-way operating mode. Before being put on the market, in order to ensure that the performance parameters of the heat pump meet the design specifications and the stringent testing requirements of GB / T 25127-2025 "Low Heat Source Temperature Air Source Heat Pump Chillers", high-precision constant temperature water supply equipment is required to provide the inlet water temperature under standard operating conditions. Existing constant temperature water supply equipment cannot switch between cooling and heating supply in both directions, requiring two independent systems, or separate hot water tanks and cold water tanks, resulting in large footprint and high cost.

[0004] In response, this solution proposes a constant temperature water supply device suitable for testing the bidirectional operating conditions of heat pumps. Utility Model Content

[0005] The purpose of this invention is to provide a constant temperature water supply device suitable for testing the bidirectional operation of heat pumps. This device integrates a bidirectional switching structure for hot and cold water, occupies a small space, and solves the shortcomings of existing devices.

[0006] This solution provides a constant temperature water supply device suitable for testing the bidirectional operation of a heat pump: it includes a cabinet shell, which contains upper and lower cavities. The upper cavity integrates a refrigeration unit, and the lower cavity integrates a water storage tank and a liquid delivery pipeline. The water storage tank is equipped with a heater assembly. The liquid delivery pipeline includes an inner circulation pipeline and an outer circulation pipeline. The inner circulation pipeline connects the refrigeration unit and the water storage tank, and the outer circulation pipeline is connected to the water storage tank. The outer circulation pipeline is provided with a pipeline interface for connecting to the test heat pump.

[0007] As a preferred embodiment, the water storage tank is provided with a flow guiding mechanism, which includes a honeycomb flow guiding plate that divides the interior of the water storage tank into cavities A and B arranged side by side in the horizontal direction.

[0008] As a preferred embodiment, the height of the honeycomb guide plate is 1 / 2 to 2 / 3 of the height of the water storage tank 12.

[0009] As a preferred embodiment, both the internal circulation pipeline and the external circulation pipeline are provided with an inlet and an outlet. The inlet of the internal circulation pipeline is connected to cavity A, and the outlet is located at the upper end of cavity B. The inlet of the external circulation pipeline is connected to cavity B, and the inlet is located at the upper end of cavity A.

[0010] As a preferred embodiment, the flow guiding mechanism further includes a top support bracket, which includes a bottom frame, a column, and a top frame. The column is disposed between the bottom frame and the top frame for fixing the honeycomb flow guiding plate. Meanwhile, a top support adjustment foot is provided on the top frame, which can be used to press the top support bracket against the inner wall of the water storage tank to achieve non-destructive fixing.

[0011] As a preferred embodiment, the water storage tank wall is a composite insulation structure consisting of a high-resistance heat insulation layer and a buffer insulation layer installed on the inner layer of the stainless steel tank wall, and a high-air-barrier sealing layer installed on the outer layer of the stainless steel tank wall.

[0012] As a preferred embodiment, the water storage tank is provided with an overflow pipe and a replenishment pipe on its side wall. The overflow pipe connects the top and bottom of the water storage tank, and the replenishment pipe can be connected to an external tap water system.

[0013] As a preferred embodiment, the heater assembly includes multiple sets of heaters, which are disposed inside the water storage tank near the bottom to heat the liquid in the water storage tank.

[0014] As a preferred embodiment, both the external circulation pipeline and the internal circulation pipeline are equipped with circulation pumps and electrically controlled valves as actuators. At the same time, temperature sensors and pressure sensors as signal acquisition elements are provided on the inlet, outlet and water storage tank of the external circulation pipeline. The actuators, signal acquisition units and controllers constitute a PID control structure.

[0015] As a preferred embodiment, the cabinet shell is provided with a human-machine interaction unit and wheels. The human-machine interaction unit is connected to the controller for on-site control, and the wheels are located at the bottom of the cabinet shell.

[0016] Compared with existing technologies, the advantages of this application are: This solution for a constant temperature water supply system for bidirectional heat pump operation testing integrates the cold and hot water supply mechanisms within a cabinet, resulting in high integration and a small footprint. Furthermore, it achieves automatic switching between cold and hot water supply using a single storage tank and two circulation pipelines, eliminating the need for separate hot and cold water tanks. In addition, the use of a hot and cold water counter-current method for constant temperature compensation control improves the switching rate and reduces preheating / precooling time (traditional equipment requires 30 minutes of preheating / cooling). Temperature stability and effective temperature control range are significantly improved compared to traditional systems. Specifically, the temperature stability of traditional equipment is ±1.2℃, while the temperature stability of this system reaches ±0.3℃. Simultaneously, the effective temperature control range of traditional equipment is 20-50℃, while the effective temperature control range of this system is 10-60℃. Therefore, this constant temperature water supply system offers advantages such as high integration, small footprint, and fast switching speed, overcoming the shortcomings of existing technologies and possessing significant market value and economic benefits. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the constant temperature water supply equipment provided by this utility model.

[0018] Figure 2 This is a schematic diagram of the internal layout of the cabinet provided by this utility model.

[0019] Figure 3 This is a top-section structural diagram of the water storage tank provided by this utility model.

[0020] Figure 4 This is a schematic diagram of the overall structure of the flow guiding mechanism provided by this utility model.

[0021] Figure Labels

[0022] 10 is the cabinet shell; 11 is the refrigeration unit; 12 is the water storage tank; 13 is the internal circulation pipeline; 14 is the external circulation pipeline; 15 is the pipeline interface; 16 is the overflow pipe; 17 is the replenishment pipe; 18 is the heater; 19 is the human-machine interface unit; 20 is the wheels; 21 is the circulation pump; 22 is the solenoid valve; 23 is the flow meter; 24 is the honeycomb guide plate; 25 is the top support bracket; 251 is the bottom frame; 252 is the column; 253 is the top frame; 26 is the top support adjustable foot. Figure 2 In the diagram: YV1-YV2 are solenoid valves 22; YM is an electric valve; F1-F2 are filters; PT1-PT2 are circulating pumps 21; P3 is the heat pump under test; T1-T3 are temperature sensors; P1-P3 are pressure sensors; Y is a liquid level sensor; L is a flow meter 23. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of the present invention.

[0024] Example 1

[0025] This embodiment provides a constant temperature water supply device suitable for testing bidirectional operation of heat pumps, such as... Figure 1-2 As shown, the constant temperature water supply equipment includes a cabinet shell 10, which comprises upper and lower cavities. At least one side of the cabinet shell 10 has a door corresponding to the upper and lower cavities. A refrigeration unit 11 is integrated within the upper cavity. Preferably, in this embodiment, the refrigeration unit 11 comprises two sets arranged in parallel. The refrigeration unit 11 is used to cool the water in the water storage tank 12 (described below) to simulate a low-temperature heat source. The lower cavity integrates the water storage tank 12 and infusion pipelines. The water storage tank 12 has a volume of 500L and is rectangular in structure. A heater assembly is provided on the water storage tank 12. Preferably, in this embodiment, the heater assembly comprises multiple sets of heaters 18, which are located inside the water storage tank 12 near the bottom to heat the water in the water storage tank 12 to simulate a high-temperature heat source. The source and infusion pipeline include an internal circulation pipeline 13 and an external circulation pipeline 14. The internal circulation pipeline 13 connects the refrigeration unit 11 and the water storage tank 12. The internal circulation pipeline 13 can continuously cool the water in the water storage tank 12 until it reaches a preset temperature, such as 10°C. The external circulation pipeline 14 is connected to the water storage tank 12 and is provided with a pipeline interface 15 for connecting to the test heat pump. The pipeline interface 15 extends to the outside of the cabinet shell 10. That is, the heat pump to be tested can be introduced into the equipment through the external circulation pipeline 14, and the external circulation pipeline 14 can be started to deliver the low temperature or high temperature heat source in the water storage tank 12 to the heat pump to be tested to test the cooling and heating performance of the heat pump. In addition, the water after heat exchange by the heat pump can be recycled back to the water storage tank 12 through the external circulation pipeline 14.

[0026] It should be noted in this embodiment that the required heat source temperature of the constant temperature water supply equipment is different during the heat pump cooling and heating performance testing. In this embodiment, it is preferred that in the heating mode test, the constant temperature water supply equipment is used to simulate a low temperature heat source, so the water in the water storage tank 12 needs to be cooled to the range of 10℃±0.3℃ through the internal circulation pipe 13. In the cooling mode test, the constant temperature water supply equipment is used to simulate a high temperature heat source, so the water in the water storage tank 12 needs to be heated to the range of 60℃±0.3℃ through the heater assembly.

[0027] Understandably, at least a temperature sensor should be installed on the water storage tank 12 to collect the real-time temperature inside the water storage tank 12 to ensure that the water temperature remains constant within the specified range.

[0028] In this embodiment, the heater assembly or the refrigeration unit 11 is not turned on individually, but rather both work together to control the temperature within a constant range. For example, in the cooling mode test, the heater assembly is activated to raise the water temperature in the water storage tank 12 to simulate a high-temperature heat source. Since the water after heat exchange by the heat pump is recycled back to the water storage tank 12, heat will be released into the circulating water via the heat pump condenser. At this time, the water temperature in the water storage tank 12 may increase and exceed the preset 60°C. Therefore, the internal circulation pipe 13 can be activated to cool the water appropriately through the refrigeration unit 11. The water temperature is kept constant at 60℃±0.3℃ by hot and cold water flushing. When entering the heating mode test, the internal circulation pipe 13 is started to cool the water through the refrigeration unit 11 until the water temperature meets the range of 10℃±0.3℃. Similarly, since the low-temperature water after absorbing heat from the heat pump evaporator is recovered into the water storage tank 12, the water temperature in the water storage tank 12 will be lower than the preset or initial 10℃±0.3℃. At this time, the heater assembly can be started to heat appropriately, and the water temperature is kept constant at 10℃±0.3℃ by hot and cold water flushing.

[0029] In summary, the constant temperature water supply equipment for bidirectional heat pump operation testing in this embodiment integrates the cold and hot water supply mechanisms within the cabinet housing 10, resulting in high integration and a small footprint. Furthermore, automatic switching between cold and hot water supply can be achieved using a single water storage tank 12 and two circulation pipelines, eliminating the need for separate hot and cold water tanks. Moreover, the use of a hot and cold water counter-current method for constant temperature compensation control not only improves the switching rate and reduces preheating or precooling time (traditional equipment requires 30 minutes of preheating / cooling), but also significantly improves temperature stability and effective temperature control range compared to traditional equipment. Specifically, the temperature stability of traditional equipment is ±1.2℃, while the temperature stability of this embodiment reaches ±0.3℃. Simultaneously, the effective temperature control range of traditional equipment is 20-50℃, while the effective temperature control range of this embodiment reaches 10-60℃. Therefore, this constant temperature water supply equipment in this embodiment has advantages such as high integration, small footprint, and fast response speed. It not only solves the shortcomings of existing technologies but also improves equipment response speed, possessing certain market value and economic benefits.

[0030] As a preferred embodiment, both the external circulation pipe 14 and the internal circulation pipe 13 are equipped with at least a circulation pump 21 and an electrically controlled valve (which can be a solenoid valve 22 or an electric valve) as actuators. At the same time, both the external circulation pipe 14 and the water storage tank 12 are equipped with temperature sensors and pressure sensors as signal acquisition elements. In particular, temperature sensors and pressure sensors are respectively installed at the inlet and outlet of the external circulation pipe 14 to obtain the inlet water temperature and return water temperature of the heat pump. Then, the heat and cooling capacity generated by the heat pump are calculated by the change in the temperature difference between the inlet water temperature and the return water temperature to calculate the heat pump energy efficiency ratio. In this embodiment, the actuator, signal acquisition unit and controller constitute a PID control structure. Through this closed-loop control structure, the constant temperature water supply equipment can be automatically switched to a low temperature state or a high temperature state. Moreover, since the overall structure of the equipment is simple and there are no extra devices, the switching response speed between the low temperature state and the high temperature state of the constant temperature water supply equipment is fast, and it can be completed in only 2.5 minutes.

[0031] Furthermore, in this embodiment, the liquid delivery route of the constant temperature water supply equipment is simplified, and the temperature of the heat pump inlet and outlet is directly measured by a temperature sensor. This makes the measured temperature value more accurate, and thus the calculated heat pump energy efficiency ratio is closer to the actual data, improving the test accuracy.

[0032] As a preferred embodiment, the cabinet shell 10 is provided with a human-machine interaction unit 19 and a walking wheel 20. The human-machine interaction unit 19 is connected to the controller for on-site control. In this embodiment, the human-machine interaction unit 19 is a touch screen. The walking wheel 20 is located at the bottom of the cabinet shell 10 to facilitate equipment transportation.

[0033] As a preferred embodiment, the side wall of the water storage tank 12 is provided with an overflow pipe 16 and a replenishment pipe 17. The overflow pipe 16 connects the top and bottom of the water storage tank 12 and is provided with a switch valve. The replenishment pipe 17 can be connected to an external tap water system to replenish liquid into the water storage tank 12.

[0034] Example 2

[0035] Compared with Embodiment 1, the difference in this embodiment is that a flow guiding mechanism is provided in the water storage tank 12. The flow guiding mechanism divides the interior of the water storage tank into two parallel chambers A and B in the horizontal direction. In this embodiment, the flow guiding mechanism includes a honeycomb flow guiding plate 24 made of stainless steel 316L or plastic material, or it includes a top support bracket 25 made of stainless steel 316L or plastic material and a honeycomb flow guiding plate 24.

[0036] When the flow guiding mechanism only includes the honeycomb flow guiding plate 24, the honeycomb flow guiding plate 24 is horizontally fixed inside the water storage tank 12 by welding or bolts, and divides the water storage tank 12 into cavities A and B that are parallel in the horizontal direction. The height of the honeycomb flow guiding plate 24 is 1 / 2 to 2 / 3 of the height of the water storage tank 12. In this embodiment, it is preferably 2 / 3. Of course, it can also be the same as the height of the water storage tank 12 if necessary.

[0037] When the flow guiding mechanism includes a top support bracket 25 and a honeycomb flow guiding plate 24, it is understood that the size of the top support bracket 25 should be adapted to the inner cavity of the water storage tank 12 to ensure that it can be placed and removed squarely. The honeycomb flow guiding plate 24 is fixed on the top support bracket 25 and divides the inside of the water storage tank 12 into cavities A and B that are parallel in the horizontal direction. The height of the honeycomb flow guiding plate 24 is 1 / 2 to 2 / 3 of the height of the water storage tank 12. In this embodiment, it is preferably 2 / 3. Of course, it can also be the same height as the water storage tank 12 if necessary. The honeycomb flow guiding plate 24, in conjunction with the internal circulation pipe 13, can improve the efficiency of hot and cold counterflow and accelerate the uniformity of hot and cold water mixing.

[0038] In this embodiment, both the internal circulation pipe 13 and the external circulation pipe 14 are preferably provided with an inlet and an outlet. The inlet of the internal circulation pipe 13 is connected to cavity A, and the outlet is located at the upper end of cavity B; the inlet of the external circulation pipe 14 is connected to cavity B, and the inlet is located at the upper end of cavity A. Figure 2-3 As shown.

[0039] In use, since the heater assembly is located in cavity A and the internal circulation connects cavity A and cavity B, after starting the circulation pump 21 corresponding to the internal circulation pipeline 13, the water in cavity A can be cooled by the cooling unit and then enter cavity B. This accelerates the flow of water in cavity A and cavity B, and the honeycomb guide plate 24 can guide the water flow to form laminar flow to the maximum extent, improve the water flow state, and reduce temperature stratification.

[0040] As a preferred embodiment, the top-supported bracket 25 includes a bottom frame 251, a column 252, and a top frame 253, such as Figure 4As shown in the figure, both the bottom frame 251 and the top frame 253 are rectangular structures. In this embodiment, it is preferable that the size of the rectangular structure is slightly smaller than the inner cavity of the water storage tank 12. The bottom frame 251 is placed on the bottom of the water storage tank 12 or on the heater assembly to ensure that it does not interfere with the heater assembly. There are two columns 252, which are set between the bottom frame 251 and the top frame 253 and are located at the center of the length direction of the bottom frame 251 and the top frame 253. The honeycomb guide plate 24 is fixed between the two columns 252 by embedding or welding. At the same time, on the top frame 251... The top frame 253 is provided with a top support adjustment foot 26. In this embodiment, the support adjustment foot is a conventional structure, including a support base, screw and bolt. It is set on opposite sides or around the top frame 253. The top support adjustment foot 26 can be used to press the top support bracket 25 against the inner wall of the water storage tank 12. This not only achieves a non-destructive connection with the water storage tank 12, but also facilitates the disassembly and assembly of the top support bracket 25 compared to welding and other methods. In addition, a support adjustment foot of appropriate strength can be selected as needed to support the entire flow guiding mechanism, so as to avoid the top support bracket 25 from contacting the heater assembly and causing damage.

[0041] Example 3

[0042] Compared with Embodiment 1 or 2, the difference in this embodiment is that the tank wall of the water storage tank 12 is a composite insulation structure consisting of a high-barrier heat insulation layer and a buffer insulation layer installed on the inner layer of the stainless steel tank wall, and a high-air-barrier sealing layer installed on the outer layer of the stainless steel tank wall. The high-barrier insulation layer is preferably an aerogel coating (5mm thick), the buffer insulation layer is a flame-retardant rubber-plastic sponge insulation board, and the high-air-barrier sealing layer is a VIP vacuum board (λ=0.004W / m·K). As explained in Embodiment 1 above, the equipment in this solution... The effective temperature control range can reach 10-60℃, while traditional equipment is only 20-50℃. The main reason is that traditional stainless steel water tanks 12 are prone to condensation at low temperatures (<15℃) and accelerated aging of seals at high temperatures (>55℃). This embodiment uses a composite structure that can significantly improve the heat insulation effect of the tank wall and reduce the heat loss rate by up to 92%. After the stainless steel tank wall is insulated, even if the water temperature is 10℃ or below, as long as the outer surface of the stainless steel does not come into contact with hot air above 15℃, condensation will not occur.

[0043] In addition, in order to adapt to high temperature (60°C), this embodiment uses a fluororubber O-ring composite structure (patented material ZL202510567890.1) as a seal, which can withstand extreme environments of -30-150°C, meeting the requirements of this embodiment.

[0044] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications without departing from this utility model, and these modifications should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of the claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A constant temperature water supply device suitable for testing bidirectional operation of heat pumps, characterized in that: The device includes a cabinet shell containing upper and lower cavities. The upper cavity integrates a refrigeration unit, and the lower cavity integrates a water tank and a liquid delivery pipeline. The water tank is equipped with a heater assembly. The liquid delivery pipeline includes an inner circulation pipeline and an outer circulation pipeline. The inner circulation pipeline connects the refrigeration unit and the water tank, and the outer circulation pipeline is connected to the water tank. The outer circulation pipeline is equipped with a pipeline interface for connecting to a test heat pump.

2. The constant temperature water supply equipment for testing bidirectional heat pump operation as described in claim 1, characterized in that: The water storage tank is equipped with a flow guiding mechanism, which includes a honeycomb flow guiding plate that divides the interior of the water storage tank into two horizontally parallel cavities, A and B.

3. The constant temperature water supply equipment for testing bidirectional heat pump operation according to claim 2, characterized in that: The height of the honeycomb guide plate is 1 / 2 to 2 / 3 of the height of the water storage tank.

4. The constant temperature water supply equipment for testing bidirectional heat pump operation according to claim 2, characterized in that: Both the internal circulation pipeline and the external circulation pipeline are provided with an inlet and an outlet. The inlet of the internal circulation pipeline is connected to cavity A, and the outlet is located at the upper end of cavity B. The inlet of the external circulation pipeline is connected to cavity B, and the inlet is located at the upper end of cavity A.

5. The constant temperature water supply equipment for testing bidirectional heat pump operation according to claim 2, characterized in that: The flow guiding mechanism also includes a top support bracket, which includes a bottom frame, a column and a top frame. The column is disposed between the bottom frame and the top frame to fix the honeycomb flow guiding plate. At the same time, a top support adjustment foot is provided on the top frame, which can be used to press the top support bracket against the inner wall of the water storage tank to achieve non-destructive fixation.

6. The constant temperature water supply equipment for testing bidirectional heat pump operation according to claim 1, characterized in that: The tank wall is a composite insulation structure consisting of a high-resistance heat insulation layer and a buffer insulation layer installed on the inner layer of the stainless steel tank wall, and a high-air-barrier sealing layer installed on the outer layer of the stainless steel tank wall.

7. The constant temperature water supply equipment for testing bidirectional heat pump operation according to claim 1, characterized in that: The water storage tank is equipped with an overflow pipe and a replenishment pipe on its side wall. The overflow pipe connects the top and bottom of the water storage tank, and the replenishment pipe can be connected to an external tap water system.

8. The constant temperature water supply equipment for testing bidirectional heat pump operation according to claim 1, characterized in that: The heater assembly includes multiple sets of heaters, which are disposed inside the water storage tank near the bottom for heating the liquid in the water storage tank.

9. The constant temperature water supply equipment for testing bidirectional heat pump operation according to claim 1, characterized in that: Both the external circulation pipeline and the internal circulation pipeline are equipped with circulation pumps and electrically controlled valves as actuators. At the same time, temperature sensors and pressure sensors as signal acquisition elements are installed at the inlet, outlet and water storage tank of the external circulation pipeline. The actuators, signal acquisition units and controllers constitute a PID control structure.

10. The constant temperature water supply equipment for testing bidirectional heat pump operation according to claim 9, characterized in that: The cabinet shell is equipped with a human-machine interface unit and wheels. The human-machine interface unit is connected to the controller for on-site control, and the wheels are located at the bottom of the cabinet shell.

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