An improved heat source tower heat pump device

Abstract

This utility model relates to an improved heat pump device for a heat source tower, comprising a compressor. The compressor's exhaust port passes sequentially through an oil separator, a condenser, a subcooler, an expansion valve, and an evaporator before being connected to the compressor's suction port, forming a refrigerant circulation loop. The cooling water inlet and outlet of the condenser are connected to the heat source tower. The chilled water inlet and outlet of the evaporator are also connected to the heat source tower. Furthermore, the cooling water inlet and outlet of the condenser, and the chilled water inlet and outlet of the evaporator, are also connected to a client. The coolant inlet and outlet of the subcooler are connected to an external recyclable cold source via a first input pipe and a first output pipe, respectively, forming a coolant loop. Therefore, this utility model can effectively achieve the subcooling effect of high-pressure refrigerant and the cooling effect of refrigeration oil, achieving energy saving and cost reduction, and fully meeting market demands.

Description

Technical Field

[0001] This utility model relates to an air conditioning device, and more particularly to a heat pump device including a heat source tower, specifically an improved heat source tower heat pump device. Background Technology

[0002] In recent years, heat source tower heat pump units have been applied and promoted.

[0003] Currently, heat pump units in heat source towers generally employ economizer systems, which achieve subcooling by exchanging heat between the throttled low-temperature refrigerant and the high-temperature refrigeration, thus achieving energy savings. However, the use of economizer systems increases the unit's cost and complicates its structure. Furthermore, oil coolers typically use a portion of cooling water or chilled water as a cold source to cool the refrigeration oil, leading to increased cooling capacity loss and cooling load, thus affecting the unit's normal performance.

[0004] Therefore, there is an urgent need to improve existing technologies in order to better meet market demands. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an improved heat source tower heat pump device that can effectively achieve the subcooling effect of high-pressure refrigerant and the cooling effect of refrigeration oil, thereby achieving energy saving and cost reduction and fully meeting market demands.

[0006] The technical solution of this utility model is:

[0007] An improved heat source tower heat pump device includes a compressor. The exhaust port of the compressor passes through an oil separator, a condenser, a subcooler, an expansion valve, and an evaporator in sequence, and is then connected to the suction port of the compressor to form a refrigerant circulation loop.

[0008] The cooling water inlet and outlet of the condenser are respectively connected to the heat source tower; the chilled water inlet and outlet of the evaporator are respectively connected to the heat source tower; the cooling water inlet and outlet of the condenser, as well as the chilled water inlet and outlet of the evaporator, are also respectively connected to the client.

[0009] The coolant inlet and coolant outlet of the subcooler are connected to an external recyclable cold source through a first input pipe and a first output pipe, respectively, forming a coolant circuit.

[0010] Furthermore, it also includes an oil cooler, whose refrigeration oil inlet and outlet are connected to the compressor's oil inlet and outlet respectively via an oil inlet pipe and an oil outlet pipe, and whose coolant inlet and outlet are connected to the recyclable cold source respectively via a second input pipe and a second output pipe.

[0011] Furthermore, a bypass pipeline is provided between the oil inlet pipeline and the oil outlet pipeline and connected thereto; a second solenoid valve is provided on the bypass pipeline; a first solenoid valve and a first shut-off valve are provided on the oil outlet pipeline; and a first temperature sensor and a second shut-off valve are provided on the oil inlet pipeline.

[0012] Furthermore, the oil return port of the oil separator is connected to the suction port of the compressor via an oil return pipeline.

[0013] Furthermore, the first input pipeline and the second input pipeline are connected together; the first output pipeline and the second output pipeline are connected together.

[0014] Furthermore, a fourth shut-off valve and a dryer filter are connected in series on the pipeline between the condenser and the subcooler.

[0015] Furthermore, a third solenoid valve and a second temperature sensor are provided on the second input pipeline.

[0016] Furthermore, a fourth solenoid valve and a third temperature sensor are provided on the first input pipeline.

[0017] Furthermore, the recyclable cold source is tap water, river water, lake water, or other similar usable water sources.

[0018] The beneficial effects of this utility model are:

[0019] 1) The refrigerant is cooled by a subcooler and a recyclable cold source, which increases the refrigerant subcooling, reduces throttling flash evaporation, increases the heat exchange of the evaporator, improves the unit's energy efficiency, and ensures the safe and reliable operation of the subcooling heat exchange through high and low temperature control.

[0020] 2) The high-temperature oil is cooled by an oil cooler and a recyclable cold source to ensure the quality of the refrigeration oil. This replaces the structural system that draws cold energy from the evaporator or condenser to cool the refrigeration oil, thus saving the system's cold energy consumption or reducing the system's cooling load and achieving the goal of energy saving. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the cooling mode operation of this utility model.

[0023] Figure 3 This is a schematic diagram of the heating mode operation of this utility model.

[0024] Among them, 1-compressor; 2-oil separator; 3-fifth solenoid valve; 4-first temperature sensor; 5-first shut-off valve; 6-second shut-off valve; 8-first solenoid valve; 9-second solenoid valve; 11-oil cooler; 12-second temperature sensor; 13-third solenoid valve; 14-evaporator; 15-third shut-off valve; 16-fourth solenoid valve; 17-subcooler; 18-expansion valve; 19-first electric three-way valve; 20-second electric three-way valve; 21-first water pump; 22-condenser; 23-fourth shut-off valve; 24-dryer filter; 25-heat source tower; 26-second water pump; 27-third electric three-way valve; 28-fourth electric three-way valve; 29-third temperature sensor. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] like Figure 1 As shown.

[0027] An improved heat pump device for a heat source tower includes a compressor 1, an oil separator 2, a fourth solenoid valve 3, a first temperature sensor 4, a first shut-off valve 5, a second shut-off valve 6, a first solenoid valve 8, a second solenoid valve 9, an oil cooler 11, a second temperature sensor 12, a third solenoid valve 13, an evaporator 14, a fourth solenoid valve 16, a subcooler 17, an expansion valve 18, a condenser 22, a dryer filter 24, a heat source tower 25, a third temperature sensor 29, etc., and its connection method is as follows:

[0028] The inlet of oil separator 2 is connected to the exhaust port of compressor 1, and its outlet is connected to condenser 22. The outlet of condenser 22, after passing through fourth shut-off valve 23 and dryer filter 24, is connected to the refrigerant inlet of subcooler 17. The refrigerant outlet of subcooler 17, after passing through first expansion valve 18 and third shut-off valve 15, is connected to the inlet of evaporator 14. The outlet of evaporator 14 is connected to the suction port of compressor 1. This constitutes the refrigerant circulation pipeline of this device. Simultaneously, the oil return port of the oil separator is connected to the suction port of compressor 1 via an oil return pipeline to ensure timely oil return. A fifth solenoid valve 3 is installed on this oil return pipeline.

[0029] The condenser 22 is equipped with a third electric three-way valve 27 and a fourth electric three-way valve 28 at its inlet and outlet, respectively, and is connected to the heat source tower 25 via inlet and outlet pipes, respectively. A second water pump 26 is also installed on the outlet pipe.

[0030] The evaporator 14 is equipped with a second electric three-way valve 20 and a first electric three-way valve 19 at its inlet and outlet, respectively, and is connected to the heat source tower 25 through inlet and outlet pipes, respectively. Meanwhile, a first water pump 21 is installed on the outlet pipe.

[0031] The first electric three-way valve 19, the second electric three-way valve 20, the third electric three-way valve 27 and the fourth electric three-way valve 28 are also connected to the pipelines of the same-direction client so as to deliver the heat exchange medium to the client as needed.

[0032] The coolant inlet and outlet of the subcooler 17 are connected to an external recyclable cold source via a first input pipe and a first output pipe, respectively, so that heat exchange can occur between the recyclable cold source and the refrigerant flowing through the subcooler. Preferably, a fourth solenoid valve 16 and a third temperature sensor 29 are provided on the first input pipe to monitor the temperature of the input recyclable cold source and control its input amount accordingly. The subcooler 17 can be a plate heat exchanger, a shell-and-tube heat exchanger, or other similar devices capable of heat and cold exchange.

[0033] The oil cooler 11 includes a refrigerant oil inlet, a refrigerant oil outlet, a coolant inlet, and a coolant outlet. The refrigerant oil inlet and outlet are connected to the oil outlet and inlet of the compressor 1 respectively via an oil outlet pipe and an oil inlet pipe, forming a refrigerant oil circulation loop. The coolant inlet and outlet are connected to an external recyclable cold source via a second input pipe and a second output pipe, respectively, to exchange heat with the refrigerant oil and reduce its temperature. Preferably, the second input pipe is equipped with a third solenoid valve 13 and a second temperature sensor 12 to monitor the temperature of the input recyclable cold source and control its input amount accordingly. The oil cooler 11 is a shell-and-tube heat exchanger, but it can also be a plate heat exchanger or other similar equipment capable of heat exchange.

[0034] Furthermore, the oil outlet pipeline is equipped with a first shut-off valve 5 and a first solenoid valve 8. The oil inlet pipeline is equipped with a second shut-off valve 6. At the same time, a bypass pipeline is provided between the oil outlet pipeline and the oil inlet pipeline, and a second solenoid valve 9 is provided on the bypass pipeline to control the opening and closing of the bypass pipeline.

[0035] Furthermore, the recyclable cold source is tap water, river water, lake water, or other similar usable water sources, which are convenient to use and reduce costs.

[0036] Furthermore, the first input pipeline and the second input pipeline are connected together, and the second output pipeline and the second output pipeline are connected together, which facilitates control and use.

[0037] The working process of this utility model is as follows:

[0038] 1) Cooling mode, such as Figure 2 As shown:

[0039] After being compressed and pressurized by compressor 1, the refrigerant enters oil separator 2 for oil separation, then enters condenser 22 to exchange heat with the coolant on the cooling side, and then passes through dryer filter 24 to enter subcooler 17. In subcooler 17, it exchanges heat with the other side at low temperature and low pressure, and then enters first expansion valve 18 for throttling and depressurization, and then enters evaporator 14. In evaporator 14, it exchanges heat with the heat transfer refrigerant and then enters compressor 1, forming a cycle.

[0040] Specifically, in condenser 22, the refrigerant absorbs heat from the high-pressure side refrigerant, its temperature rises, and it then enters heat source tower 25. In heat source tower 25, it exchanges heat with the air, releases heat, and cools down before flowing back to condenser 22 to exchange heat with the high-pressure side refrigerant. In evaporator 14, the refrigerant exchanges heat with the low-pressure side refrigerant, releases heat, and cools down before entering the customer's cooling load area to provide cooling load. After exchanging heat and heating up, it flows back to evaporator 14 to exchange heat with the low-pressure side refrigerant and cool down. This cycle repeats repeatedly to meet the customer's cooling load requirements.

[0041] Specifically, during cooling, the unit can operate without the oil cooler. Therefore, the first solenoid valve 8 and the third solenoid valve 13 are closed, while the second solenoid valve 9, the first shut-off valve 5, and the second shut-off valve 6 are opened, allowing the refrigerant oil to bypass the compressor 1 and flow back to the compressor 1 via the second solenoid valve 9.

[0042] Specifically, the condenser 22 itself has the effect of subcooling the liquid refrigerant, which is a primary subcooling.

[0043] Specifically, the high-temperature and high-pressure refrigerant in the subcooler 17 comes from the condenser 22 and the low-temperature medium in the subcooler 17, which exchange heat and cool down before entering the first expansion valve 25. The low-temperature medium in the subcooler 17 is drawn from a recyclable cold source, and after heat exchange and heating up, it is discharged back to the recyclable cold source. The high-temperature and high-pressure refrigerant is cooled down after heat exchange to achieve the secondary subcooling function of the refrigerant.

[0044] Specifically, the on / off control of the fourth solenoid valve 16 is based on the inlet water temperature value T3 collected by the third temperature sensor 29 at the subcooler inlet.

[0045] Specifically, when the subcooler inlet water temperature T3 < the target value Tz (optimal value is 5), the system continuously judges and shuts off the fourth solenoid valve 16 and alarms after a delay of t1 (optimal value is 3) minutes to prevent the subcooler from freezing and cracking due to low inlet water temperature; when the subcooler inlet water temperature T3 > the target value Tz + D5 (optimal value of D5 is 5), the system continuously judges and shuts off the fourth solenoid valve 16 after a delay of t2 (optimal value is 3) minutes to achieve effective subcooling; when the subcooler inlet water temperature T3 > the target value Td (optimal value is 35), the system continuously judges and shuts off the fourth solenoid valve 16 and alarms after a delay of t1 (optimal value is 35) minutes to prevent ineffective subcooling or refrigerant heating; when the subcooler inlet water temperature T3 < the target value Td - D6 (optimal value of D6 is 5), the system continuously judges and shuts off the fourth solenoid valve (16) after a delay of t2 (optimal value is 3) minutes to achieve effective subcooling. Among them, Tz+D5 <Td-D6,Tz<Td。

[0046] 2) Heating mode, such as Figure 3 As shown:

[0047] After being compressed and pressurized by compressor 1, the refrigerant enters oil separator 2 for oil separation, then enters condenser 22 to exchange heat with the coolant on the cooling side, and then passes through dryer filter 24 to enter subcooler 17. In subcooler, it exchanges heat with the low-temperature medium on the other side and then enters first expansion valve 18 for throttling and depressurization and cooling, and then enters evaporator 14. In evaporator 14, it exchanges heat with the heat transfer refrigerant and then enters compressor 1, forming a cycle.

[0048] Specifically, in condenser 22, the refrigerant absorbs heat from the high-pressure side refrigerant, its temperature rises, and then it enters the customer's premises to provide heat load. After releasing heat and cooling down at the customer's premises, it flows back to condenser 22 to exchange heat with the high-pressure side refrigerant. In evaporator 14, the refrigerant exchanges heat with the low-pressure side refrigerant, releases heat, and cools down. Then it enters heat source tower 25 to exchange heat with the air, absorbs heat, and rises in temperature before flowing back to evaporator 14 to exchange heat with the low-pressure side refrigerant and cool down. This cycle repeats to meet the customer's heat load requirements.

[0049] Specifically, when the oil temperature T1 (i.e., the temperature value of the first temperature sensor 4 or the compressor discharge temperature measured by other temperature measuring elements) reaches the set range, the first solenoid valve 8, the third solenoid valve 13, the first shut-off valve 5, and the second shut-off valve 6 are opened, and the second solenoid valve 9 is closed, so that the high-temperature oil enters the oil cooler from the compressor 1, exchanges heat with the low-temperature medium from the recyclable cold source to cool down, and then enters the compressor to complete the cooling process of the refrigeration oil.

[0050] Specifically, the oil separated in the oil separator 2 passes through the fourth solenoid valve 3, mixes with the oil from the evaporator 14, and flows into the compressor suction port, achieving a good oil return effect.

[0051] Specifically, the condenser 22 itself has the effect of subcooling the liquid refrigerant, which is a primary subcooling.

[0052] Specifically, the high-temperature and high-pressure refrigerant in the subcooler 17 comes from the condenser 22 and the low-temperature medium in the subcooler 17, and after heat exchange and cooling, it enters the first expansion valve 25; the low-temperature medium in the subcooler 17 is drawn from a recyclable cold source, and after heat exchange and heating, it is discharged and returned to the recyclable cold source; the high-temperature and high-pressure refrigerant is cooled after heat exchange to achieve the secondary subcooling function of the refrigerant.

[0053] Specifically, the on / off control of the fourth solenoid valve 16 is based on the inlet water temperature value T3 collected by the third temperature sensor 29 at the subcooler inlet.

[0054] Specifically, when the subcooler inlet water temperature T3 < the target value Tz (optimal value is 5), the system continuously judges and delays for t1 (optimal value is 3) minutes to shut off the fourth solenoid valve 16 and sound an alarm to prevent the subcooler from freezing and cracking due to low inlet water temperature; when the subcooler inlet water temperature T3 > the target value Tz + D5 (optimal value of D5 is 5), the system continuously judges and delays for t2 (optimal value is 3) minutes to close the fourth solenoid valve 16 to achieve effective subcooling; when the subcooler inlet water temperature T3 > the target value Td (optimal value is 35), the system continuously judges and delays for t1 (optimal value is 35) minutes to shut off the fourth solenoid valve 16 and sound an alarm to prevent ineffective subcooling or heating of refrigerant; when the subcooler inlet water temperature T3 < the target value Td - D6 (optimal value of D6 is 5), the system continuously judges and delays for t2 (optimal value is 3) minutes to close the fourth solenoid valve (16) to achieve effective subcooling. Among them, Tz+D5 <Td-D6,Tz<Td。

[0055] Specifically, when the oil temperature T1 is less than the target value Ta of the refrigeration oil temperature (the optimal value is 40), the system continuously judges and delays for t3 minutes to close the first solenoid valve 8 and open the second solenoid valve 9. When the oil temperature T1 is greater than the target value Ta+D3 of the refrigeration oil temperature (the optimal value of D3 is 30), the system continuously judges and delays for t3 minutes to close the first solenoid valve 8 and close the second solenoid valve 9.

[0056] Specifically, when the oil cooler inlet water temperature T2 is less than the target value Tc (optimal value is 5), the system continuously judges and delays for t1 (optimal value is 3) minutes to shut off the third solenoid valve 13 and trigger an alarm. When the oil cooler inlet water temperature T2 is greater than the target value Tc + D1 (optimal value of D1 is 5), the system continuously judges and delays for t2 (optimal value is 3) minutes to close the third solenoid valve 13. When the oil cooler inlet water temperature T2 is greater than the oil temperature T1, the system continuously judges and delays for t1 (optimal value is 3) minutes to shut off the third solenoid valve 13 and triggers an alarm. When the oil cooler inlet water temperature T2 is less than the oil temperature T1 - D2 (optimal value of D2 is 5), the system continuously judges and delays for t2 (optimal value is 3) minutes to close the third solenoid valve 13.

[0057] The parts not covered in this utility model are the same as or can be implemented using existing technologies.

Claims

1. An improved heat source tower heat pump device, comprising a compressor, characterized in that, The compressor's exhaust port passes sequentially through an oil separator, condenser, subcooler, expansion valve, and evaporator before connecting to the compressor's suction port, forming a refrigerant circulation loop. The cooling water inlet and outlet of the condenser are respectively connected to the heat source tower; the chilled water inlet and outlet of the evaporator are respectively connected to the heat source tower; the cooling water inlet and outlet of the condenser, as well as the chilled water inlet and outlet of the evaporator, are also respectively connected to the client. The coolant inlet and coolant outlet of the subcooler are connected to an external recyclable cold source through a first input pipe and a first output pipe, respectively, forming a coolant circuit.

2. The improved heat source tower heat pump device according to claim 1, characterized in that, It also includes an oil cooler, whose refrigeration oil inlet and outlet are connected to the compressor's oil inlet and outlet respectively via an oil inlet pipe and an oil outlet pipe, and whose coolant inlet and outlet are connected to the recyclable cold source respectively via a second input pipe and a second output pipe.

3. The improved heat source tower heat pump device according to claim 2, characterized in that, A bypass pipeline is provided between the oil inlet pipeline and the oil outlet pipeline; a second solenoid valve is provided on the bypass pipeline; a first solenoid valve and a first shut-off valve are provided on the oil outlet pipeline; a first temperature sensor and a second shut-off valve are provided on the oil inlet pipeline.

4. The improved heat source tower heat pump device according to claim 1, characterized in that, The oil separator's return port is connected to the compressor's suction port via a return oil pipeline.

5. The improved heat source tower heat pump device according to claim 2, characterized in that, The first input pipeline and the second input pipeline are connected; the first output pipeline and the second output pipeline are connected.

6. The improved heat source tower heat pump device according to claim 1, characterized in that, The pipeline between the condenser and the subcooler is equipped with a shut-off valve and a dryer filter connected in series.

7. The improved heat source tower heat pump device according to claim 2, characterized in that, The second input pipeline is equipped with a third solenoid valve and a second temperature sensor.

8. The improved heat source tower heat pump device according to claim 1, characterized in that, The first input pipeline is equipped with a fourth solenoid valve and a third temperature sensor.

9. The improved heat source tower heat pump device according to claim 1, characterized in that, The recyclable cold source is tap water, river water, or lake water.

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