Jet synergistic type enhanced vapor injection efficient heat pump

Abstract

The utility model provides a jet synergy type enhanced vapor injection high-efficiency heat pump, the system is composed of a conventional heat pump module, an enhanced vapor injection module and a jet module, the enhanced vapor injection module comprises a flash tank and a jet electronic expansion valve, and the jet module comprises a jet, an electromagnetic valve and other parts. Refrigerant flashed from the flash tank enters the ejector through the ejection electronic expansion valve and is ejected to a middle pressure cavity of the compressor through the ejector, and the enhanced vapor injection effect is generated. Besides, in order to improve the ejection effect of the ejector and control the working temperature of the compressor, an ejection coil pipe is designed in the gas-liquid separator, high-temperature and high-pressure refrigerants are introduced from the high-pressure side, and heat exchange with return gas refrigerants is achieved in gas separation, so that on one hand, the temperature of the refrigerants in the low-pressure section of a compressor cavity can be increased, and the compressor is prevented from running with liquid; meanwhile, the intermediate cavity temperature and the exhaust temperature of the compressor can be reduced, the whole cavity temperature of the compressor is moderate, and safe and reliable operation of the compressor is guaranteed.

Description

Technical Field

[0001] This utility model relates to an active jet enthalpy-enhancing heat pump system, and more specifically, to a jet-enhanced high-efficiency jet enthalpy-enhancing heat pump. Background Technology

[0002] Air source heat pumps are heating devices that convert electrical energy and air energy into heat through the work of a compressor, achieving complementary use of electrical and air energy to generate heating. However, in low-temperature environments, the heating capacity and energy efficiency of these units suffer significant reductions. The most practical solution is vapor injection enthalpy enhancement technology. Currently, there are two main types of vapor injection enthalpy enhancement technologies commonly used in the market: 1-2 horsepower heat pump units generally use the flash tank type, while 3 horsepower and above units mostly use the economizer type. For flash tank vapor injection enthalpy enhancement heat pump units, the refrigerant flashed from the flash tank is injected into the intermediate pressure chamber of the compressor. If there is too much refrigerant in the flash tank, the flashed refrigerant may contain liquid. Furthermore, if the flash volume is too large, it can damage the compressor. To avoid this problem, a solenoid valve is designed on the injection pipe. When the compressor discharge temperature is detected to be too low, the solenoid valve closes, stopping vapor injection enthalpy enhancement. Alternatively, an electronic expansion valve is designed on the injection pipe to adjust the injected refrigerant quantity and prevent the compressor from operating with liquid. If the refrigerant pressure after throttling by the electronic expansion valve is lower than the pressure in the intermediate chamber of the compressor, it will lead to back injection. Utility Model Content

[0003] In view of this, in order to overcome the above-mentioned technical defects, this utility model proposes a jet-enhanced high-efficiency heat pump with jet enthalpy enhancement. The refrigerant flashed out in the flash tank enters the low-pressure ejector tube of the ejector through the flow regulating electronic expansion valve, and is then ejected by the ejector to the intermediate pressure chamber of the compressor, generating a jet enthalpy enhancement effect to ensure the safe and reliable operation of the compressor.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A jet-enhanced high-efficiency heat pump with jet enthalpy enhancement is characterized by comprising a conventional heat pump module, a jet enthalpy enhancement module, and a jet module;

[0006] The conventional heat pump module includes a variable frequency compressor, an oil separator, a four-way valve, a condenser, a main liquid pipe, a main electronic expansion valve, an outdoor heat exchanger, and a gas-liquid separator connected in sequence. The outlet pipe of the gas-liquid separator is connected to the return pipe of the variable frequency compressor to form a closed main cycle.

[0007] The jet enthalpy enhancement module includes a flash tank and an electronic expansion valve. The flash tank includes a refrigerant inlet pipe, a refrigerant outlet pipe, and a vapor outlet pipe. The refrigerant inlet pipe is connected to the main liquid pipe, and the refrigerant outlet pipe is connected to the inlet pipe of the main electronic expansion valve.

[0008] The injection module includes a solenoid valve and an injector. The injector includes a low-pressure ejector tube, a high-pressure injection inlet tube, and an injection outlet tube. The low-pressure ejector tube is connected to the steam outlet tube of the flash tank. The high-pressure injection inlet tube is connected to the high-pressure side of the heat pump via the solenoid valve. The injection outlet tube is connected to the intermediate pressure chamber of the variable frequency compressor.

[0009] In addition, to enhance the ejector's ejection effect and control the compressor's operating temperature, an ejector coil is designed in the gas-liquid separator to introduce high-temperature, high-pressure refrigerant from the high-pressure side. This refrigerant exchanges heat with the return gas refrigerant in the gas separator. On the one hand, this increases the refrigerant temperature in the low-pressure section of the compressor cavity, preventing the compressor from operating with liquid. On the other hand, it reduces the temperature of the compressor's intermediate cavity and the exhaust temperature, ensuring a moderate temperature throughout the compressor cavity and guaranteeing safe and reliable operation.

[0010] Furthermore, the gas-liquid separator is equipped with a spray coil, the inlet end of which is connected to the high-pressure side of the heat pump, and the outlet end of which is connected to the high-pressure spray inlet of the injector.

[0011] Furthermore, the high-pressure injection inlet pipe is connected to the main liquid pipe or the main gas pipe.

[0012] Furthermore, a heating water pump is connected to the return water pipe of the condenser.

[0013] Furthermore, the exhaust pipe of the variable frequency compressor is connected to the d pipe of the four-way valve via an oil separator, the s pipe of the four-way valve is connected to the main gas pipe, the c pipe of the four-way valve is connected to one end of the outdoor heat exchanger, and the e pipe of the four-way valve is connected to the inlet pipe of the gas-liquid separator.

[0014] Furthermore, it also includes a temperature detection module, which includes an exhaust temperature sensor, an outdoor ambient temperature sensor, a coil temperature sensor on the outdoor heat exchanger, an intake temperature sensor, a return water temperature sensor, and an outlet water temperature sensor.

[0015] The exhaust temperature sensor is used to detect the exhaust temperature T. d The outdoor ambient temperature sensor is used to detect the outdoor ambient temperature T. ao The inhalation temperature sensor is used to detect the inhalation temperature T. s The coil temperature sensor is used to detect the coil temperature T. def .

[0016] Furthermore, the condenser side includes a return water temperature sensor and an outlet water temperature sensor, wherein the return water temperature sensor is used to detect the return water temperature T of the condenser. win The outlet water temperature sensor is used to detect the outlet water temperature T of the condenser. w,out .

[0017] The main technical effects of this utility model are reflected in the following aspects:

[0018] 1. This application utilizes an ejector, combined with a flow-regulating electronic expansion valve, to inject an appropriate amount of refrigerant from the flash tank into the intermediate pressure chamber of the compressor, thereby achieving the effect of vapor injection and enthalpy enhancement. The ejector includes a low-pressure ejector tube, a high-pressure injection inlet tube, and an injection outlet tube. The high-pressure injection inlet tube is connected to the high-pressure side of the heat pump, introducing high-temperature and high-pressure refrigerant. The kinetic energy of the mixed fluid is converted into pressure energy in the diffuser section of the ejector, causing the pressure of the mixed vapor to rise, exceeding the pressure of the intermediate pressure chamber of the compressor, ensuring forward injection into the intermediate pressure chamber of the variable frequency compressor and avoiding reverse injection.

[0019] 2. Design an injection coil in the gas-liquid separator to introduce high-temperature and high-pressure refrigerant from the high-pressure side. The high-temperature and high-pressure refrigerant exchanges heat with the return gas refrigerant in the injection coil. On the one hand, it can increase the refrigerant temperature in the low-pressure section of the compressor cavity to prevent the compressor from running with liquid. On the other hand, it can reduce the compressor temperature in the intermediate cavity and the compressor discharge temperature, so that the temperature of the entire compressor cavity is moderate, ensuring the safe and reliable operation of the compressor. Attached Figure Description

[0020] Figure 1 System flow diagram of the jet-enhanced enthalpy-increasing high-efficiency heat pump in Example 1;

[0021] Figure 2 System flow diagram of the jet-enhanced enthalpy-increasing high-efficiency heat pump in Example 2;

[0022] Figure 3 System flow diagram of the jet-enhanced high-efficiency heat pump with increased enthalpy in Example 3.

[0023] Figure label:

[0024] 1. Variable frequency compressor; 2. High-pressure switch; 3. Oil separator; 4. Four-way valve; 5. Main gas pipe; 6. Condenser; 7. Main liquid pipe; 8. Main electronic expansion valve; 9. Outdoor heat exchanger; 10. Low-pressure switch; 11. Gas-liquid separator; 12. Oil return capillary tube; 13. Flash tank; 131. Refrigerant inlet pipe; 132. Refrigerant outlet pipe; 133. Vapor outlet pipe; 14. Injection electronic expansion valve; 15. Solenoid valve; 16. Ejector; 161. Low-pressure ejector tube; 162. High-pressure injection inlet pipe; 163. Injection outlet pipe; 17. Injection coil; 21. Water pump; 31. Exhaust temperature sensor; 32. Outdoor ambient temperature sensor; 33. Coil temperature sensor; 34. Suction temperature sensor; 35. Return water temperature sensor; 36. Outlet water temperature sensor. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0026] Example 1:

[0027] Please refer to Figure 1 A high-efficiency heat pump with jet-enhanced enthalpy includes a conventional heat pump module, a jet-enhanced enthalpy module, and a jet module. The organic combination of these three components achieves a highly efficient heating cycle, making it particularly suitable for stable operation in low-temperature environments.

[0028] The conventional heat pump module serves as the core of the system's main circulation, with its internal components forming a closed loop to create a refrigerant circulation path. The conventional heat pump module includes, in sequence, a variable frequency compressor 1, an oil separator 3, a four-way valve 4, a condenser 6, a main liquid pipe 7, a main electronic expansion valve 8, an outdoor heat exchanger 9, and a gas-liquid separator 11. The outlet pipe of the gas-liquid separator 11 is connected to the return pipe of the variable frequency compressor 1, forming a closed main circulation. Specifically, the exhaust pipe of the variable frequency compressor 1 is connected to the d-pipe of the four-way valve 4 via the oil separator 3; the s-pipe of the four-way valve 4 is connected to the main gas pipe 5; the c-pipe of the four-way valve 4 is connected to one end of the outdoor heat exchanger 9; and the e-pipe of the four-way valve 4 is connected to the inlet pipe of the gas-liquid separator 11.

[0029] The vapor injection enthalpy enhancement module is crucial for improving system performance in low-temperature environments and works in synergy with conventional heat pump modules. The vapor injection enthalpy enhancement module includes a flash tank 13 and an electronic expansion valve 14. The flash tank 13 includes a refrigerant inlet pipe 131, a refrigerant outlet pipe 132, and a vapor outlet pipe 133. The refrigerant inlet pipe 131 is connected to the main liquid pipe 7, and the refrigerant outlet pipe 132 is connected to the inlet pipe of the main electronic expansion valve 8.

[0030] The injection module includes a solenoid valve 15 and an injector 16. The injector includes a low-pressure ejector pipe 161, a high-pressure injection inlet pipe 162, and an injection outlet pipe 163. The low-pressure ejector pipe 161 is connected to the steam outlet pipe 133 of the flash tank 13. The high-pressure injection inlet pipe 162 is connected to the high-pressure side of the heat pump via the solenoid valve 15. The injection outlet pipe 163 is connected to the intermediate pressure chamber of the variable frequency compressor 1. In this embodiment, the high-pressure injection inlet pipe 162 is connected to the main liquid pipe 7.

[0031] A heating water pump 21 is connected to the outlet pipe of the condenser 6. The heating water pump 21 delivers hot water to the heating terminal.

[0032] Meanwhile, the system is equipped with a complete temperature detection module, which monitors temperature parameters in real time through various sensors: the exhaust temperature sensor 31 is installed in the exhaust pipe of the variable frequency compressor 1 to detect the exhaust temperature T. dOutdoor ambient temperature sensor 32 is used to collect outdoor ambient temperature T. ao This provides a basis for the system to adapt to environmental changes; the coil temperature sensor 33 on the outdoor heat exchanger 9 can detect the coil temperature T. def This is used to determine the heat pump's frosting status, the conditions for entering defrost mode, and the conditions for ending defrost mode; the suction temperature sensor 34 is installed on the return air line of the variable frequency compressor 1 to detect the suction temperature T. s This serves as a parameter for adjusting the opening of the main electronic expansion valve. On the condenser side, the return water temperature sensor 35 and the outlet water temperature sensor 36 are respectively installed on the return water pipe and outlet water pipe of the condenser to detect the return water temperature T. w,in and outlet water temperature T w,out By monitoring the temperature difference between the inlet and outlet water, the compressor's output capacity is controlled to ensure that the heating hot water temperature meets the design requirements.

[0033] Further explanation using the system flow diagram:

[0034] The high-temperature gaseous refrigerant discharged from the variable frequency compressor 1 passes through the oil separator 3, the d-tube and S-tube of the four-way valve 4, and the main gas pipe 5 before entering the condenser 6 for heat exchange. After releasing heat, the refrigerant is divided into two paths after passing through the main liquid pipe 7. One path enters the flash tank 13 through the refrigerant inlet pipe 131, achieving the separation of gaseous and liquid refrigerant. Specifically, it is divided into two branches, one of which is the flow path for liquid refrigerant. The liquid refrigerant passes through the refrigerant outlet pipe 132, the main electronic expansion valve 8, the outdoor heat exchanger 9, the c-tube and e-tube of the four-way valve 4, and the gas-liquid separator 11 before returning to the variable frequency compressor. In Unit 1, the refrigerant completes the conventional main cycle. In another branch, the refrigerant flashes into a gaseous state in the flash tank 13. The gaseous refrigerant is discharged through the vapor outlet pipe 133 and enters the ejector 16 through the injection electronic expansion valve 14 and the low-pressure ejector pipe 161. Another branch of refrigerant passes through the solenoid valve 15 and enters the ejector 16 through the high-pressure injection inlet pipe 162. It then mixes with the refrigerant that enters the ejector 16 through the low-pressure ejector pipe 161 and undergoes pressure boosting inside the ejector 16. Finally, it is delivered to the intermediate pressure chamber of the variable frequency compressor 1 through the injection outlet pipe 163 to achieve vapor injection enthalpy enhancement, effectively improving the compressor's heating capacity and operating efficiency.

[0035] Example 2:

[0036] Please see Figure 2 Unlike Embodiment 1, this embodiment includes a jet coil 17 within the gas-liquid separator 11. The inlet end of the jet coil 17 is connected to the high-pressure side of the heat pump, and the outlet end of the jet coil 17 is connected to the high-pressure jet inlet pipe 162 of the ejector 16. Specifically, in this embodiment, the inlet end of the jet coil 17 is connected to the main liquid pipe 7.

[0037] Further explanation using the system flow diagram:

[0038] The high-temperature gaseous refrigerant discharged from the variable frequency compressor 1 passes through the oil separator 3, the d-pipe of the four-way valve 4, the S-pipe of the four-way valve 4, and the main gas pipe 5 before entering the condenser 6 for heat exchange. After releasing heat, the refrigerant flows through the main liquid pipe 7 and the refrigerant inlet pipe 131 before entering the flash tank 13, achieving the separation of gaseous and liquid refrigerant. Specifically, it is divided into two flow paths. One flow path is the flow path of liquid refrigerant. After passing through the refrigerant outlet pipe 132, the liquid refrigerant is divided into two branches. The liquid refrigerant in one branch passes through the main electronic expansion valve 8, the outdoor heat exchanger 9, the c-pipe of the four-way valve 4, the e-pipe of the four-way valve 4, and the gas-liquid separator 11 before returning to the variable frequency compressor 1, completing the conventional main cycle; the other... One branch of liquid refrigerant enters the injection coil 17 through the solenoid valve 15, undergoes heat exchange in the gas-liquid separator 11 to increase the return gas temperature of the variable frequency compressor 1, and enters the ejector 16 through the high-pressure injection inlet pipe 162; the other branch of refrigerant flashes into gaseous refrigerant in the flash tank 13, and the gaseous refrigerant is discharged from the vapor outlet pipe 133 and enters the ejector 16 through the injection electronic expansion valve 14 and the low-pressure ejector pipe 161. It mixes with the refrigerant entering the ejector 16 through the high-pressure injection inlet pipe 162 and completes the pressure increase inside the ejector 16. Finally, it is delivered to the intermediate pressure chamber of the variable frequency compressor 1 through the injection outlet pipe 163 to achieve vapor injection enthalpy increase, effectively improving the heating capacity and operating efficiency of the compressor.

[0039] Example 3:

[0040] Please see Figure 3 Unlike in Embodiment 2, in this embodiment the inlet end of the injection coil 17 is connected to the main air pipe 5.

[0041] Further explanation using the system flow diagram:

[0042] The high-temperature gaseous refrigerant discharged from the variable frequency compressor 1 is divided into two paths after passing through the oil separator 3, the d-pipe of the four-way valve 4, the S-pipe of the four-way valve 4, and the main gas pipe 5. One path of refrigerant enters the condenser 6 for heat exchange. After releasing heat, the refrigerant flows through the main liquid pipe 7 and the refrigerant inlet pipe 131 into the flash tank 13, achieving the separation of gaseous and liquid refrigerant. Specifically, it is divided into two branches. One branch is the flow path for liquid refrigerant. The liquid refrigerant flows through the refrigerant outlet pipe 132, the main electronic expansion valve 8, the outdoor heat exchanger 9, the c-pipe of the four-way valve 4, the e-pipe of the four-way valve 4, and the gas-liquid separator 11 before returning to the variable frequency compressor 1, completing the conventional main cycle. The other branch... The refrigerant flashes into a gaseous state in the flash tank 13. The gaseous refrigerant is discharged from the vapor outlet pipe 133 and enters the ejector 16 through the injection electronic expansion valve 14 and the low-pressure ejector pipe 161. Another refrigerant enters the injection coil 17 through the solenoid valve 15, where it undergoes heat exchange in the gas-liquid separator 11 to increase the temperature of the return gas chamber of the variable frequency compressor 1. It then enters the ejector 16 through the high-pressure injection inlet pipe 162 and mixes with the refrigerant that enters the ejector 16 through the low-pressure ejector pipe. The pressure is increased inside the ejector 16, and finally, it is delivered to the intermediate pressure chamber of the variable frequency compressor 1 through the injection outlet pipe 163 to achieve vapor injection enthalpy enhancement, effectively improving the compressor's heating capacity and operating efficiency.

[0043] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A jet-enhanced high-efficiency heat pump with jet enthalpy enhancement, characterized in that: This includes conventional heat pump modules, jet enthalpy enhancement modules, and injection modules; The conventional heat pump module includes a variable frequency compressor (1), an oil separator (3), a four-way valve (4), a condenser (6), a main liquid pipe (7), a main electronic expansion valve (8), an outdoor heat exchanger (9), and a gas-liquid separator (11) connected in sequence. The outlet pipe of the gas-liquid separator (11) is connected to the return pipe of the variable frequency compressor (1) to form a closed main cycle. The jet enthalpy enhancement module includes a flash tank (13) and an electronic expansion valve (14). The flash tank (13) includes a refrigerant inlet pipe (131), a refrigerant outlet pipe (132), and a vapor outlet pipe (133). The refrigerant inlet pipe (131) is connected to the main liquid pipe (7), and the refrigerant outlet pipe (132) is connected to the inlet pipe of the main electronic expansion valve (8). The injection module includes a solenoid valve (15) and an injector (16). The injector includes a low-pressure ejector pipe (161), a high-pressure injection inlet pipe (162), and an injection outlet pipe (163). The low-pressure ejector pipe (161) is connected to the steam outlet pipe (133) of the flash tank (13). The high-pressure injection inlet pipe (162) is connected to the high-pressure side of the heat pump via the solenoid valve (15). The injection outlet pipe (163) is connected to the intermediate pressure chamber of the variable frequency compressor (1).

2. The jet-enhanced high-efficiency heat pump with increased enthalpy as described in claim 1, characterized in that: The gas-liquid separator (11) is equipped with a spray coil (17). The inlet end of the spray coil (17) is connected to the high-pressure side of the heat pump, and the outlet end of the spray coil (17) is connected to the high-pressure spray inlet (162) of the injector (16).

3. The jet-enhanced high-efficiency heat pump with increased enthalpy as described in claim 1, characterized in that: The high-pressure injection inlet pipe (162) is connected to the main liquid pipe (7) or the main gas pipe (5).

4. The jet-enhanced high-efficiency heat pump with increased enthalpy as described in claim 1, characterized in that: A heating water pump (21) is connected to the return water pipe of the condenser (6).

5. The jet-enhanced enthalpy-increasing high-efficiency heat pump as described in claim 1, characterized in that: The exhaust pipe of the variable frequency compressor (1) is connected to the d pipe of the four-way valve (4) via the oil separator (3). The s pipe of the four-way valve (4) is connected to the main gas pipe (5). The c pipe of the four-way valve (4) is connected to one end of the outdoor heat exchanger (9). The e pipe of the four-way valve (4) is connected to the inlet pipe of the gas-liquid separator (11).

6. The jet-enhanced high-efficiency heat pump with increased enthalpy as described in claim 1, characterized in that: It also includes a temperature detection module, which includes an exhaust temperature sensor (31), an outdoor ambient temperature sensor (32), a coil temperature sensor on the outdoor heat exchanger (33), and an intake temperature sensor (34). The exhaust temperature sensor (31) is used to detect the exhaust temperature T. d The outdoor ambient temperature sensor (32) is used to detect the outdoor ambient temperature T. ao The inhalation temperature sensor (34) is used to detect the inhalation temperature T. s The coil temperature sensor (33) is used to detect the coil temperature T on the outdoor heat exchanger (9). def .

7. The jet-enhanced high-efficiency heat pump with increased enthalpy as described in claim 4, characterized in that: The condenser side includes a return water temperature sensor (35) and an outlet water temperature sensor (36), wherein the return water temperature sensor (35) is used to detect the return water temperature T of the condenser. w,in The outlet water temperature sensor (36) is used to detect the outlet water temperature T of the condenser. w,out .

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