Low-temperature backwater heat pump unit for heat exchange station

Abstract

The invention discloses a low-temperature backwater heat pump unit for a heat exchange station, and relates to the technical field of heat pumps. The air conditioner comprises a machine shell, a compressor is fixedly installed in the middle of the interior of the machine shell, the outer side of the compressor is sleeved with a heat exchanger, an evaporator is fixedly installed on the back face of the interior of the machine shell, two buffer tanks are fixedly installed on the front face of the interior of the machine shell, and an expansion valve is fixedly installed at the bottom of the interior of the machine shell; the expansion valve is located between the compressor and the evaporator, temperature control assemblies are installed on the two sides of the inner wall of the machine shell, and a fan is fixedly installed on the top of the machine shell. Through the arrangement of the stepless regulation temperature control assembly, low-temperature return water at any temperature can be regulated and controlled, when regulation is not carried out, the temperature control assembly can carry out heat preservation on a heat exchange part, the normal operation stability of the heat pump can be greatly guaranteed, the heat pump can be switched between normal operation and low-temperature return water for use, and the application range is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and particularly to a low-temperature return water heat pump unit for a heat exchange station. Background Art

[0002] A heat pump is a highly energy-efficient device that makes full use of low-grade heat energy. Heat can spontaneously transfer from a high-temperature object to a low-temperature object, but it cannot spontaneously go in the opposite direction. The working principle of a heat pump is a mechanical device that forces heat to flow from a low-temperature object to a high-temperature object in a reverse cycle manner. It only consumes a small amount of net work in the reverse cycle and can obtain a large amount of heat supply, effectively utilizing the difficult-to-apply low-grade heat energy to achieve the purpose of energy conservation.

[0003] In the literature (application number: CN202121608593.1), a primary heat network low-temperature return water heating system is disclosed. This system directly pumps low-temperature return water into the heat pump for heat exchange. Currently, mainly the low-temperature return water is introduced into the evaporator to exchange heat with the refrigerant in the evaporator. In a centralized heating system, the low-temperature return water can increase the temperature difference of the heat exchanger, thereby improving the heat exchange efficiency. However, during actual use, the temperature of the low-temperature return water fluctuates greatly, increasing the difficulty of heat pump regulation in the system. When the return water temperature suddenly drops, the load of the heat pump system may change violently, resulting in system instability or efficiency decline. When the return water temperature is too high, it will cause the temperature of the refrigerant entering the compressor to rise, which will also affect the service life of the compressor. Therefore, the low-temperature return water temperature is particularly important for the stable operation of the heat pump. Summary of the Invention

[0004] The purpose of the present invention is: to solve the above problems, the present invention provides a low-temperature return water heat pump unit for a heat exchange station.

[0005] The present invention specifically adopts the following technical solutions to achieve the above purpose:

[0006] A low-temperature return water heat pump unit for a heat exchange station, including a machine shell. A compressor is fixedly installed in the middle inside the machine shell. A heat exchanger is sleeved outside the compressor. An evaporator is fixedly installed on the back inside the machine shell. Two buffer tanks are fixedly installed on the front inside the machine shell. An expansion valve is fixedly installed at the inner bottom of the machine shell, and the expansion valve is located between the compressor and the evaporator. Temperature control components are installed on both sides of the inner wall of the machine shell. A fan is fixedly installed on the top of the machine shell;

[0007] The compressed refrigerant inlet on the compressor is connected to the refrigerant outlet on the evaporator, the compressed refrigerant outlet on the compressor is connected to the heat exchange refrigerant inlet on the heat exchanger, the heat exchange refrigerant outlet on the heat exchanger is connected to the temperature control component on the right side, a water outlet is arranged at the top of the heat exchanger, the expansion refrigerant inlet on the expansion valve is connected to the temperature control component on the right side, the expansion refrigerant outlet on the expansion valve is connected to the refrigerant inlet on the evaporator, temperature sensors are arranged inside both buffer tanks, a low-temperature water pipe is simultaneously connected to the fronts of both buffer tanks, drain three-way solenoid valves are arranged at the bottoms of both buffer tanks, and the two drain three-way solenoid valves are respectively connected to the two temperature control components. An inlet three-way solenoid valve is arranged at the water inlet end of the evaporator, and the inlet three-way solenoid valve is simultaneously connected to the two temperature control components. The left temperature control component is connected to the external cold water and the water inlet of the heat exchanger.

[0008] Further, the temperature control component includes a temperature control liquid inlet pipe, a temperature control liquid discharge pipe, a low-temperature water inlet pipe and a low-temperature water return pipe fixedly installed inside the machine shell. A plurality of temperature control pipes are arranged between the temperature control liquid inlet pipe and the temperature control liquid discharge pipe. Two external heat exchange grooves are formed on the outer side of the temperature control pipe. A connecting inlet water pipe and a connecting return water pipe are respectively arranged at the bottoms of the two external heat exchange grooves. The connecting inlet water pipe is connected to the low-temperature water inlet pipe, and the connecting return water pipe is connected to the low-temperature water return pipe. The left temperature control liquid inlet pipe is connected to the external cold water, the left temperature control liquid discharge pipe is connected to the water inlet of the heat exchanger, the right temperature control liquid inlet pipe is connected to the heat exchange refrigerant outlet, the right temperature control liquid discharge pipe is connected to the expansion refrigerant inlet on the expansion valve, the low-temperature water inlet pipes on both sides are simultaneously connected to the two drain three-way solenoid valves, and the low-temperature water return pipes on both sides are simultaneously connected to the inlet three-way solenoid valve;

[0009] An adjusting sliding ring is sleeved on the outer side of the temperature control pipe. Two blocking pieces are arranged on the inner wall of the adjusting sliding ring, and the blocking pieces are slidably connected in the external heat exchange grooves. A rubber outer sleeve is sleeved on the outer side of the temperature control pipe, and the adjusting sliding ring is located inside the rubber outer sleeve. A lifting sleeve is sleeved on the outer side of the rubber outer sleeve. A conical expansion port is arranged at the top of the lifting sleeve. After the adjusting sliding ring jacks up the rubber outer sleeve, it can be tightly inserted into the conical expansion port, and the adjusting sliding ring and the lifting sleeve can move up and down.

[0010] Further, an electric telescopic rod is fixedly installed inside the machine shell. A lifting plate is fixedly installed at the top of the electric telescopic rod. A plurality of installation holes are formed inside the lifting plate, and the lifting sleeve is fixedly installed in the installation holes.

[0011] Further, a top spring is arranged between the adjusting sliding ring and the top of the temperature control pipe.

[0012] Furthermore, connecting air pipes are provided at the tops of the two groups of external heat exchange tanks. A gas storage tank is fixedly installed at the inner top of the machine shell. Heat preservation gas is stored inside the gas storage tank. A pressure control drive is arranged at the bottom of the gas storage tank. A temperature control air pipe is fixedly installed inside the machine shell. The gas storage tank is communicated with the connecting air pipe through the temperature control air pipe.

[0013] Furthermore, the pressure control drive includes a pressure control electric telescopic rod and a piston plate. The pressure control electric telescopic rod is fixedly installed at the bottom of the gas storage tank. The piston plate is slidably connected in the gas storage tank. The telescopic end of the pressure control electric telescopic rod penetrates through the gas storage tank and is fixedly connected to the piston plate.

[0014] Furthermore, nitrogen gas is stored inside the gas storage tank.

[0015] Furthermore, the lifting sleeve is fixedly installed on the lifting plate through a flange.

[0016] Furthermore, installation feet are provided at the bottom of the machine shell.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. Through the arrangement of the two buffer tanks, the present invention can alternately collect low-temperature return water, balance the temperature, reduce the instantaneous temperature fluctuation. The temperature sensor detects the temperature of the low-temperature return water in the buffer tank. When the temperature is relatively low, the low-temperature return water is introduced into the temperature control component on the right side, and the redundant heat in the high-temperature medium after heat exchange is used for heating to make the low-temperature return water reach the desired temperature, and then it enters the evaporator to exchange heat with the refrigerant. When the temperature is relatively high, the low-temperature return water is introduced into the temperature control component on the left side, and the redundant temperature is introduced into the cold water to make the low-temperature return water reach the desired temperature, thereby achieving the effect of automatically adjusting the temperature of the low-temperature return water, improving the operation stability of the heat pump, without the need to introduce external heat sources and cold sources, making full use of the heat source and cold source in the heat pump, with a simple control structure and being integrated into the heat pump in an integrated manner, and the structure is compact.

[0019] 2. Through the arrangement of the stepless adjustment temperature control component, the present invention can not only adjust the low-temperature return water at any temperature, but also keep the heat exchange part insulated when not adjusted, which can greatly ensure the normal operation stability of the heat pump, enable the heat pump to switch between normal operation and low-temperature return water, and has a wide application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic three-dimensional structure diagram of the present invention;

[0021] Figure 2 is a schematic internal structure of the present invention Figure 1 ;

[0022] Figure 3 is a schematic internal structure of the present invention Figure 2 ;

[0023] Figure 4 is the explosion of the internal structure of the present invention Figure 1 ;

[0024] Figure 5 is the explosion of the internal structure of the present invention Figure 2 ;

[0025] Figure 6 is the schematic structural diagram of the temperature control component of the present invention;

[0026] Figure 7 is the schematic structural diagram of the lifting sleeve and the temperature control tube of the present invention;

[0027] Figure 8 is the disassembly and assembly schematic diagram of the lifting sleeve and the temperature control tube of the present invention;

[0028] Figure 9 is the schematic cross-sectional structural diagram of the lifting sleeve and the temperature control tube of the present invention;

[0029] Figure 10 is the schematic diagram of the adjusting slip ring of the present invention;

[0030] Figure 11 is the schematic diagram of the lifting plate of the present invention.

[0031] Reference numerals: 1, housing; 2, compressor; 21, compressed refrigerant inlet; 3, heat exchanger; 31, water inlet; 32, water outlet; 33, heat exchange refrigerant outlet; 4, evaporator; 41, water inlet three-way solenoid valve; 5, expansion valve; 51, expansion refrigerant outlet; 52, expansion refrigerant inlet; 6, buffer tank; 61, low-temperature water pipe; 62, drainage three-way solenoid valve; 7, temperature control component; 71, electric telescopic rod; 72, lifting plate; 721, mounting hole; 73, lifting sleeve; 731, tapered expansion port; 74, temperature control liquid inlet pipe; 75, temperature control liquid discharge pipe; 76, temperature control tube; 761, external heat exchange groove; 762, connecting air pipe; 763, connecting water inlet pipe; 764, connecting water return pipe; 77, adjusting slip ring; 78, rubber outer sleeve; 79, low-temperature water inlet pipe; 710, low-temperature water return pipe; 711, temperature control air pipe; 8, fan; 9, gas storage tank; 91, pressure control drive. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0033] Embodiment 1, as Figures 1-11As shown in the figure, a low-temperature return water heat pump unit for a heat exchange station includes a machine shell 1. A compressor 2 is fixedly installed in the middle inside the machine shell 1. A heat exchanger 3 is sleeved outside the compressor 2. An evaporator 4 is fixedly installed on the back inside the machine shell 1. Two buffer tanks 6 are fixedly installed on the front inside the machine shell 1. An expansion valve 5 is fixedly installed on the inner bottom of the machine shell 1. The expansion valve 5 is located between the compressor 2 and the evaporator 4. Temperature control components 7 are installed on both sides of the inner wall of the machine shell 1. A fan 8 is fixedly installed on the top of the machine shell 1;

[0034] The compressed refrigerant inlet 21 on the compressor 2 is communicated with the refrigerant outlet on the evaporator 4. The compressed refrigerant outlet on the compressor 2 is communicated with the heat exchange refrigerant inlet on the heat exchanger 3. The heat exchange refrigerant outlet 33 on the heat exchanger 3 is communicated with the temperature control component 7 on the right. A water outlet 32 is arranged at the top of the heat exchanger 3. The expansion refrigerant inlet 52 on the expansion valve 5 is communicated with the temperature control component 7 on the right. The expansion refrigerant outlet 51 on the expansion valve 5 is communicated with the refrigerant inlet on the evaporator 4. Temperature sensors are arranged inside both buffer tanks 6. A low-temperature water pipe 61 is simultaneously communicated with the fronts of both buffer tanks 6. Drain three-way solenoid valves 62 are arranged at the bottoms of both buffer tanks 6. The two drain three-way solenoid valves 62 are respectively communicated with the two temperature control components 7. An inlet three-way solenoid valve 41 is arranged at the water inlet end of the evaporator 4. The inlet three-way solenoid valve 41 is simultaneously communicated with the two temperature control components 7. The temperature control component 7 on the left is communicated with the outside cold water and the water inlet 31 of the heat exchanger 3.

[0035] Furthermore, installation feet are arranged at the bottom of the machine shell 1.

[0036] During use, the outside low-temperature return water alternately enters the buffer tanks 6 through the low-temperature water pipe 61 to balance the temperature and reduce the instantaneous temperature fluctuation. After a certain amount of low-temperature return water is stored in one of the buffer tanks 6, the other buffer tank 6 starts to intake water. The temperature sensor detects the temperature of the low-temperature return water in the buffer tank 6. When the temperature is relatively low, the low-temperature return water is introduced into the temperature control component 7 on the right. The high-temperature medium generated by the compression of the compressor 2 exchanges heat with cold water in the heat exchanger 3. The temperature of the medium after heat exchange is generally the output hot water temperature, which is higher than the low-temperature return water temperature. The high-temperature medium after heat exchange does not enter the expansion valve 5 first, but enters the temperature control component 7 on the right first. The excess heat in the high-temperature medium after heat exchange is used to heat the low-temperature return water to make the low-temperature return water reach the desired temperature, and then it enters the evaporator 4 to exchange heat with the refrigerant. The high-temperature medium after exchange is then converted into a low-temperature medium through the expansion valve 5 and enters the evaporator 4, and then absorbs the heat in the low-temperature return water;

[0037] When the temperature is relatively high, the low-temperature return water is introduced into the temperature control component 7 on the left side. The outside cold water passes through the temperature control component 7 on the left side and then enters the heat exchanger 3 for heat exchange. The cold water absorbs the excess temperature in the low-temperature return water. Therefore, the water temperature entering the heat exchanger 3 will increase. At this time, the flow rate of the cold water can be increased to improve the hot water heating efficiency, and the stable operation of the heat pump can be ensured. After the low-temperature return water reaches the desired temperature, it enters the evaporator 4 to exchange heat with the low-temperature medium, thereby achieving the effect of automatically adjusting the temperature of the low-temperature return water, improving the stability of the heat pump operation, without the need to introduce external heat sources and cold sources, making full use of the heat sources and cold sources in the heat pump, with a simple control structure and being integrated into the heat pump in an integrated manner, and the structure is compact;

[0038] After the low-temperature medium in the evaporator 4 absorbs the temperature of the low-temperature return water, it enters the compressor 2 and is compressed into a high-temperature medium, and then exchanges heat with the cold water.

[0039] Embodiment 2, on the basis of the above embodiment, further includes that the temperature control component 7 includes a temperature control liquid inlet pipe 74, a temperature control liquid discharge pipe 75, a low-temperature water inlet pipe 79 and a low-temperature return water pipe 710 fixedly installed inside the machine shell 1. A plurality of temperature control pipes 76 are arranged between the temperature control liquid inlet pipe 74 and the temperature control liquid discharge pipe 75. Two outer heat exchange grooves 761 are opened on the outer side of the temperature control pipe 76. A connecting water inlet pipe 763 and a connecting water return pipe 764 are respectively arranged at the bottoms of the two outer heat exchange grooves 761. The connecting water inlet pipe 763 is communicated with the low-temperature water inlet pipe 79, and the connecting water return pipe 764 is communicated with the low-temperature return water pipe 710. The left temperature control liquid inlet pipe 74 is communicated with the outside cold water, and the left temperature control liquid discharge pipe 75 is communicated with the water inlet 31 of the heat exchanger 3. The right temperature control liquid inlet pipe 74 is communicated with the heat exchange refrigerant outlet 33, and the right temperature control liquid discharge pipe 75 is communicated with the expansion refrigerant inlet 52 on the expansion valve 5. The two low-temperature water inlet pipes 79 on both sides are simultaneously communicated with two drainage three-way solenoid valves 62, and the two low-temperature return water pipes 710 on both sides are simultaneously communicated with a water inlet three-way solenoid valve 41;

[0040] An adjusting sliding ring 77 is sleeved on the outer side of the temperature control pipe 76. Two blocking pieces are arranged on the inner wall of the adjusting sliding ring 77, and the blocking pieces are slidably connected in the outer heat exchange groove 761. A rubber outer sleeve 78 is sleeved on the outer side of the temperature control pipe 76. The adjusting sliding ring 77 is located inside the rubber outer sleeve 78. A lifting sleeve 73 is sleeved on the outer side of the rubber outer sleeve 78. A conical expansion port 731 is arranged at the top of the lifting sleeve 73. After the adjusting sliding ring 77 jacks up the rubber outer sleeve 78, it can be tightly inserted into the conical expansion port 731, and the adjusting sliding ring 77 and the lifting sleeve 73 can move up and down.

[0041] Medium flow direction: The high-temperature medium in the compressor 2 enters the right temperature-controlled liquid inlet pipe 74 after passing through the heat exchanger 3, and then enters the expansion refrigerant inlet 52 through the temperature-controlled pipe 76 and the temperature-controlled liquid inlet pipe 74. Then it enters the expansion valve 5 to form a low-temperature medium. The low-temperature medium enters the evaporator 4 through the expansion refrigerant outlet 51. After absorbing heat through the evaporator 4, the low-temperature medium enters the compressor 2 through the compressed refrigerant inlet 21 and is compressed into a high-temperature medium;

[0042] Cold water flow direction: Cold water enters through the left temperature-controlled liquid inlet pipe 74, and then enters the water inlet 31 through the temperature-controlled pipe 76 and the temperature-controlled liquid inlet pipe 74. After heat exchange through the heat exchanger 3, the required hot water is discharged through the water outlet 32;

[0043] Low-temperature return water flow direction: The external low-temperature return water alternately enters the buffer tank 6 through the low-temperature water pipe 61 to balance the temperature and reduce the instantaneous temperature fluctuation. After a certain amount of low-temperature return water is stored in one group of buffer tanks 6, the other group of buffer tanks 6 starts to intake water. The temperature sensor detects the temperature of the low-temperature return water in the buffer tank 6. When the temperature is low, the drain three-way solenoid valve 62 guides the low-temperature return water into the right low-temperature inlet pipe 79, and then enters one group of external heat exchange tanks 761 through the connecting inlet pipe 763. When the water flow reaches the position of the regulating slip ring 77, it is blocked, and the rubber outer sleeve 78 at the position of the regulating slip ring 77 is expanded, connecting the two groups of external heat exchange tanks 761. The water flows back through the other group of external heat exchange tanks 761, and then enters the evaporator 4 through the connecting return pipe 764, the low-temperature return water pipe 710 and the intake three-way solenoid valve 41. Finally, it is discharged through the drain end in the evaporator 4. The low-temperature return water exchanges heat with the high-temperature medium in the right temperature-controlled pipe 76 and heats up;

[0044] When the temperature is high, the drain three-way solenoid valve 62 guides the low-temperature return water into the left low-temperature inlet pipe 79, and then enters one group of external heat exchange tanks 761 through the connecting inlet pipe 763. When the water flow reaches the position of the regulating slip ring 77, it is blocked, and the rubber outer sleeve 78 at the position of the regulating slip ring 77 is expanded, connecting the two groups of external heat exchange tanks 761. The water flows back through the other group of external heat exchange tanks 761, and then enters the evaporator 4 through the connecting return pipe 764, the low-temperature return water pipe 710 and the intake three-way solenoid valve 41. Finally, it is discharged through the drain end in the evaporator 4. The low-temperature return water exchanges heat with the cold water in the left temperature-controlled pipe 76 and cools down;

[0045] It should be noted that after the adjusting slip ring 77 jacks up the rubber outer sleeve 78, it can be tightly inserted into the conical expansion port 731. Therefore, a stable seal can be maintained between the adjusting slip ring 77 and the rubber outer sleeve 78. And since the lifting sleeve 73 is always tightly sleeved on the rubber outer sleeve 78 below the adjusting slip ring 77, the two groups of outer heat exchange grooves 761 below are independent of each other and are only connected at the position of the conical expansion port 731. So by simultaneously controlling the lifting of the adjusting slip ring 77 and the lifting sleeve 73, the low-temperature return water heat exchange distance can be controlled, and thus the effect of stepless temperature control can be achieved, with good adjustment effect.

[0046] Embodiment 3, on the basis of the above embodiment, further includes that an electric telescopic rod 71 is fixedly installed inside the machine case 1, a lifting plate 72 is fixedly installed at the top of the electric telescopic rod 71, a plurality of mounting holes 721 are formed inside the lifting plate 72, and the lifting sleeve 73 is fixedly installed in the mounting holes 721.

[0047] Furthermore, the lifting sleeve 73 is fixedly installed on the lifting plate 72 through a flange.

[0048] By controlling the operation of the electric telescopic rod 71, the electric telescopic rod 71 drives the lifting plate 72 to lift, and the lifting plate 72 drives the lifting sleeve 73 to lift.

[0049] Embodiment 4, on the basis of the above embodiment, further includes that a top spring is arranged between the adjusting slip ring 77 and the top of the temperature control pipe 76.

[0050] Through this design, the elastic force of the spring is used to make the adjusting slip ring 77 stably press against the conical expansion port 731, and thus it can lift synchronously with the lifting sleeve 73.

[0051] Embodiment 5, on the basis of the above embodiment, further includes that connecting air pipes 762 are arranged at the tops of the two groups of outer heat exchange grooves 761, an air storage tank 9 is fixedly installed at the inner top of the machine case 1, a heat preservation gas is stored inside the air storage tank 9, a pressure control driver 91 is arranged at the bottom of the air storage tank 9, a temperature control air pipe 711 is fixedly installed inside the machine case 1, and the air storage tank 9 is connected to the connecting air pipes 762 through the temperature control air pipe 711.

[0052] In this embodiment, compared with Embodiment Four, another method for adjusting the lifting of the slip ring 77 is provided. First, control the operation of the electric telescopic rod 71. The electric telescopic rod 71 drives the lifting plate 72 to lift and lower. The lifting plate 72 drives the lifting sleeve 73 to lift and lower. The lifting sleeve 73 first lifts and lowers. Then, the gas in the gas storage tank 9 is injected above the adjusting slip ring 77 through the temperature control air pipe 711 and the connecting air pipe 762. Under the action of air pressure, the adjusting slip ring 77 slides downward. When the adjusting slip ring 77 slides into the conical expansion port 731, the adjusting slip ring 77 is tightly pressed in the conical expansion port 731. This method has a better adjustment effect, and the influence of the adjusting slip ring 77 and the rubber outer sleeve 78 on the lifting and lowering of the lifting sleeve 73 is relatively small. At the same time, when the temperature control pipe 76 does not need to perform heat exchange, the adjusting slip ring 77 descends to the lowest position, and the space between the rubber outer sleeve 78 and the temperature control pipe 76 is completely filled with heat preservation gas, ensuring that the high-temperature medium will not lose too much heat when passing through the temperature control pipe 76 under normal adjustment, and the heat pump operates stably.

[0053] The heat preservation gas in this embodiment is not limited, and nitrogen, helium, carbon dioxide, etc. are all acceptable.

[0054] Embodiment Six, on the basis of the above embodiment, further includes that the pressure control drive 91 includes a pressure control electric telescopic rod and a piston plate. The pressure control electric telescopic rod is fixedly installed at the bottom of the gas storage tank 9, and the piston plate is slidably connected in the gas storage tank 9. The telescopic end of the pressure control electric telescopic rod penetrates through the gas storage tank 9 and is fixedly connected to the piston plate.

[0055] When the adjusting slip ring 77 slides downward, the pressure control electric telescopic rod drives the piston plate to rise, pressing more gas into the upper part of the adjusting slip ring 77. When the adjusting slip ring 77 slides downward, the pressure control electric telescopic rod drives the piston plate to descend, sucking back the excess gas. Therefore, it can ensure that the pressure above the adjusting slip ring 77 is moderate.

[0056] Embodiment Seven, on the basis of the above embodiment, further includes that nitrogen is stored inside the gas storage tank 9. Nitrogen is usually used in common heat preservation materials because it is relatively cheap and has a good effect.

[0057] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-temperature return water heat pump unit for a heat exchange station, comprising a casing (1), characterized in that: A compressor (2) is fixedly installed in the middle of the casing (1), a heat exchanger (3) is sleeved on the outer side of the compressor (2), an evaporator (4) is fixedly installed on the back of the casing (1), two groups of buffer tanks (6) are fixedly installed on the front of the casing (1), an expansion valve (5) is fixedly installed on the inner bottom of the casing (1), and the expansion valve (5) is located between the compressor (2) and the evaporator (4), temperature control components (7) are installed on both sides of the inner wall of the casing (1), and a fan (8) is fixedly installed on the top of the casing (1); The compressed refrigerant inlet (21) on the compressor (2) is connected to the refrigerant outlet on the evaporator (4), the compressed refrigerant outlet on the compressor (2) is connected to the heat exchange refrigerant inlet on the heat exchanger (3), the heat exchange refrigerant outlet (33) on the heat exchanger (3) is connected to the temperature control component (7) on the right, a water outlet (32) is provided on the top of the heat exchanger (3), the expanded refrigerant inlet (52) on the expansion valve (5) is connected to the temperature control component (7) on the right, the expanded refrigerant outlet (51) on the expansion valve (5) is connected to the refrigerant inlet on the evaporator (4), and the compressed refrigerant outlet (21) on the compressor (2) is connected to the heat exchange refrigerant inlet on the heat exchanger (3), and the heat exchange refrigerant outlet (33) on the heat exchanger (3) is connected to the temperature control component (7) on the right. The two groups of buffer tanks (6) are connected, temperature sensors are arranged inside the two groups of buffer tanks (6), the fronts of the two groups of buffer tanks (6) are connected with low-temperature water pipes (61), the bottoms of the two groups of buffer tanks (6) are arranged with drainage three-way solenoid valves (62), the two groups of drainage three-way solenoid valves (62) are connected with the two groups of temperature control components (7) respectively, the water inlet end of the evaporator (4) is arranged with a water inlet three-way solenoid valve (41), the water inlet three-way solenoid valve (41) is connected with the two groups of temperature control components (7), and the left temperature control component (7) is connected with the external cold water and the water inlet (31) of the heat exchanger (3).

2. A low-temperature return water heat pump unit for a heat exchange station according to claim 1, characterized in that: The temperature control assembly (7) comprises a temperature control liquid inlet pipe (74), a temperature control liquid discharge pipe (75), a low-temperature water inlet pipe (79) and a low-temperature water return pipe (710) fixedly mounted inside the housing (1); a plurality of groups of temperature control pipes (76) are arranged between the temperature control liquid inlet pipe (74) and the temperature control liquid discharge pipe (75); two groups of external heat exchange grooves (761) are arranged on the outside of the temperature control pipes (76); a connecting water inlet pipe (763) and a connecting water return pipe (764) are respectively arranged at the bottom of the two groups of external heat exchange grooves (761); the connecting water inlet pipe (763) is connected to the low-temperature water inlet pipe (79); the connecting water return pipe (764) is connected to the low-temperature water inlet pipe (79); The return pipe (764) is connected to the low-temperature return pipe (710), the left temperature-controlled liquid inlet pipe (74) is connected to external cold water, the left temperature-controlled liquid discharge pipe (75) is connected to the water inlet (31) of the heat exchanger (3), the right temperature-controlled liquid inlet pipe (74) is connected to the heat exchange refrigerant outlet (33), the right temperature-controlled liquid discharge pipe (75) is connected to the expansion refrigerant inlet (52) on the expansion valve (5), the low-temperature water inlet pipe (79) is simultaneously connected to two sets of three-way drainage solenoid valves (62), and the low-temperature return pipes (710) on both sides are simultaneously connected to the water inlet three-way solenoid valve (41); The outer side of the temperature control tube (76) is sleeved with an adjusting slip ring (77), and the inner wall of the adjusting slip ring (77) is provided with two groups of baffles, which are slidably connected in the outer heat exchange groove (761). The outer side of the temperature control tube (76) is sleeved with a rubber jacket (78), and the adjusting slip ring (77) is located inside the rubber jacket (78). The outer side of the rubber jacket (78) is sleeved with a lifting sleeve (73), and the top of the lifting sleeve (73) is provided with a conical expansion opening (731). After the adjusting slip ring (77) lifts up the rubber jacket (78), it can be tightly inserted into the conical expansion opening (731), and the adjusting slip ring (77) and the lifting sleeve (73) can be raised and lowered.

3. A low-temperature return water heat pump unit for a heat exchange station according to claim 2, characterized in that: An electric telescopic rod (71) is fixedly installed inside the housing (1), a lifting plate (72) is fixedly installed on the top of the electric telescopic rod (71), a plurality of mounting holes (721) are provided inside the lifting plate (72), and a lifting sleeve (73) is fixedly installed in the mounting hole (721).

4. A low-temperature return water heat pump unit for a heat exchange station according to claim 3, characterized in that: A top spring is arranged between the adjusting slip ring (77) and the top of the temperature control tube (76).

5. A low-temperature return water heat pump unit for a heat exchange station according to claim 3, characterized in that: The tops of the two groups of external heat exchange grooves (761) are both provided with connecting air pipes (762); a gas storage tank (9) is fixedly installed on the inner top of the casing (1); the gas storage tank (9) stores heat-insulating gas; a pressure control drive (91) is provided on the bottom of the gas storage tank (9); a temperature control air pipe (711) is fixedly installed inside the casing (1); the gas storage tank (9) is connected to the connecting air pipe (762) via the temperature control air pipe (711).

6. A low-temperature return water heat pump unit for a heat exchange station according to claim 5, characterized in that: The pressure control drive (91) comprises a pressure control electric telescopic rod and a piston plate. The pressure control electric telescopic rod is fixedly mounted on the bottom of the gas storage tank (9). The piston plate is slidably connected in the gas storage tank (9). The telescopic end of the pressure control electric telescopic rod passes through the gas storage tank (9) and is fixedly connected to the piston plate.

7. A low-temperature return water heat pump unit for a heat exchange station according to claim 6, characterized in that: Nitrogen is stored inside the gas storage tank (9).

8. A low-temperature return water heat pump unit for a heat exchange station according to any one of claims 2 to 7, characterized in that: The lifting sleeve (73) is fixedly mounted on the lifting plate (72) via a flange.

9. A low-temperature return water heat pump unit for a heat exchange station according to claim 1, characterized in that: The bottom of the casing (1) is provided with mounting feet.

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