Heat pump based on synergistic effect of thermoelectric effect and active jet augmentation and control method

Abstract

The application provides a heat pump and a control method based on thermoelectric effect and active jet energy addition synergistic effect. The system comprises a heat pump module, a thermoelectric module and an active jet energy addition module. The cold end and the hot end of the thermoelectric module are used as a supercooler of a conventional jet energy addition and an economizer of the active jet energy addition respectively. The heat pump liquid pipe is embedded in the cold end of the thermoelectric module. The refrigerant in the liquid pipe exchanges heat with the cold end, so that the supercooling degree is improved to absorb more air energy. The active jet energy addition injection pipe is embedded in the hot end of the thermoelectric module after passing through the jet energy addition electronic expansion valve. The injection refrigerant absorbs the heat generated by the hot end of the thermoelectric module and is injected into the intermediate pressure cavity of the compressor, so that the heat generated by the hot end of the thermoelectric module is converted into heating capacity. Furthermore, in order to strengthen the heat exchange effect between the injection refrigerant and the hot end of the thermoelectric module, the hot end is designed as a cavity structure to perform fluorine-water heat exchange. The cold end and the hot end of the thermoelectric module jointly work to realize cold and heat supply, and synergistically improve the performance of the active jet energy addition, so that the performance of the heat pump is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to an active jet energy-increasing heat pump system, and more particularly to a heat pump based on the synergistic effect of thermoelectric effect and active jet energy-increasing and a control method. BACKGROUND

[0002] An air source heat pump is a heating device that converts electrical energy and air energy into heat through the work of a compressor, realizes the complementation of electrical energy and air energy, and generates heat, but the heat generation and energy efficiency decay seriously in a low-temperature environment, and it cannot be used in an extremely low-temperature environment. The main solution for commercial application at present is jet energy-increasing technology.

[0003] However, the conventional jet energy-increasing is based on the heat exchange of the system itself. The refrigerant in the main liquid pipe of the heat pump and the refrigerant in the jet pipe exchange heat in the economizer, improve the supercooling degree to absorb more air energy, but the jet enthalpy difference cannot be converted into heat generation, so the jet energy-increasing has a limited improvement range for the performance of the heat pump.

[0004] The active jet energy-increasing technology invented by the applicant can convert the heat of an external low-grade heat source into heat generation. See patent CN119042839A. The external hot water is pumped to the economizer of the heat pump unit. In the economizer, the hot water and the jet refrigerant exchange heat, and the refrigerant that absorbs the heat of the external heat source is injected into the intermediate pressure cavity of the compressor to convert the absorbed heat into heat generation, greatly improving the performance of the heat pump. However, this system needs an external low-grade heat source. In places where there is no external low-grade heat source, this technology cannot be widely applied. SUMMARY

[0005] Therefore, in order to overcome the above technical defects, the present application proposes a heat pump based on the synergistic effect of thermoelectric effect and active jet energy-increasing and a control method. The cold end of the thermoelectric module reduces the temperature of the refrigerant in the liquid pipe of the heat pump, improves the supercooling degree, is conducive to the heat pump to absorb more air energy, and the heat of the hot end of the thermoelectric module can be used for active jet energy-increasing to convert the heat generation of the hot end of the thermoelectric module into heat generation. The combined action of the cold end and the hot end realizes cold and heat supply, fully utilizes the effect of the thermoelectric module, and synergistically increases the effect with the active jet energy-increasing, greatly improving the performance of the heat pump.

[0006] In order to realize the above technical advantages, the technical scheme of the present application is as follows:

[0007] The heat pump based on the synergistic effect of thermoelectric effect and active jet energy-increasing comprises a heat pump main module, an active jet energy-increasing module and a thermoelectric module. The heat pump main module comprises a variable frequency compressor, an oil separator, a four-way valve, a condenser, a liquid storage tank, an outdoor heat exchanger and a gas-liquid separator connected in sequence, and forms a refrigerant circulating main loop.

[0008] The active jet enthalpy enhancement module includes an active jet inlet pipe, an active jet outlet pipe, and an electronic expansion valve for jet enthalpy enhancement. One end of the active jet inlet pipe is connected to the main liquid pipe, the electronic expansion valve for jet enthalpy enhancement is installed on the active jet inlet pipe, and one end of the active jet outlet pipe is connected to the intermediate pressure chamber pipe of the variable frequency compressor.

[0009] The thermoelectric module includes a thermoelectric cold end and a thermoelectric hot end. One path of refrigerant flowing through the main liquid pipe exchanges heat with the thermoelectric cold end, while the other path of refrigerant flowing through the main liquid pipe exchanges heat with the thermoelectric hot end through an active injection inlet pipe, an electronic expansion valve for vapor injection enthalpy enhancement, and an active injection outlet pipe.

[0010] Furthermore, the active jet enthalpy enhancement module also includes an economizer. The economizer is connected to the main liquid pipe at the front or rear end of the hot end module via the active jet inlet pipe. The economizer is connected to the intermediate pressure chamber pipe of the variable frequency compressor via the active jet outlet pipe. A hot water circulation pipeline is connected to the economizer. A water pump is installed on the hot water circulation pipeline. The water pump drives the hot water to circulate in the hot water circulation pipeline, so that the hot water exchanges heat with the injected refrigerant in the economizer. The refrigerant that has absorbed the heat from the hot water is injected into the intermediate pressure chamber of the variable frequency compressor.

[0011] 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 c pipe of the four-way valve is connected to one end of the outdoor heat exchanger, the e pipe of the four-way valve is connected to the gas pipe of the condenser via the main gas pipe, the s pipe of the four-way valve is connected to the inlet pipe of the gas-liquid separator, the outlet pipe of the gas-liquid separator is connected to the return gas pipe of the variable frequency compressor, the other end of the outdoor heat exchanger is connected to the liquid pipe of the condenser via the main liquid pipe, and a heating water pump is installed on the outlet pipe of the condenser on the condensing side.

[0012] Furthermore, it also includes a temperature detection module, which comprises an exhaust temperature sensor, an outdoor ambient temperature sensor, a coil temperature sensor on the outdoor heat exchanger, an intake temperature sensor, a liquid pipe temperature sensor, a thermoelectric module hot-end temperature sensor, and an injection inlet pipe temperature sensor.

[0013] 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 The liquid pipe temperature sensor is used to detect the liquid pipe temperature T. liq The thermoelectric module hot-end temperature sensor is used to detect the temperature T of the thermoelectric hot end. therm-e,h The injection inlet temperature sensor is used to detect the temperature T of the active injection inlet.inj.in .

[0014] Further, the condensing side comprises a return water temperature sensor for detecting the return water temperature T w,in of the condenser and an outlet water temperature sensor for detecting the outlet water temperature T w,out .

[0015] The control method of the heat pump based on the synergistic effect of thermoelectric effect and active jet augmented enthalpy is applied to the heat pump based on the synergistic effect of thermoelectric effect and active jet augmented enthalpy, and the control method comprises

[0016] S1: configured with a preset active jet augmented enthalpy opening condition, when the active jet augmented enthalpy opening condition is met, the active jet augmented enthalpy operation control is started;

[0017] S2: configured with a preset active jet augmented enthalpy closing condition, when the active jet augmented enthalpy closing condition is met, the active jet augmented enthalpy operation control is closed.

[0018] Further, the active jet augmented enthalpy opening condition is specifically that the heat pump unit is started to operate, and the thermoelectric hot end temperature sensor detects that the thermoelectric hot end temperature T therm-e,h is greater than the liquid pipe temperature T liq + a preset temperature difference threshold ΔT liq .

[0019] Further, the active jet augmented enthalpy closing condition is specifically that the thermoelectric hot end temperature sensor detects that the thermoelectric hot end temperature T therm-e,h is less than or equal to the jet inlet pipe temperature T inj,in + a preset temperature difference threshold ΔT inj,in , or the thermoelectric hot end temperature T therm-e,h is less than or equal to the initial hot end temperature T therm-e,h,0 + a preset temperature difference threshold ΔT therm-e,h,0 , the initial hot end temperature T therm-e,h,0 is specifically the temperature of the thermoelectric hot end before the thermoelectric module works.

[0020] The technical effects of the present application mainly reflect in the following aspects:

[0021] The system of the present application is composed of a heat pump main module, a thermoelectric module and an active ejector enthalpy-increasing module. The cold end and the hot end of the thermoelectric module are used as the economizer of the conventional ejector enthalpy-increasing and the economizer of the active ejector enthalpy-increasing, respectively. The heat pump liquid pipe is embedded in the cold end of the thermoelectric module, and the refrigerant in the liquid pipe exchanges heat with the cold end of the thermoelectric module to improve the supercooling degree and absorb more air energy. In one case, the active ejector outlet pipe is embedded in the hot end of the thermoelectric module after passing through the ejector enthalpy-increasing electronic expansion valve, forming an active ejector enthalpy-increasing module. The ejector refrigerant absorbs the heat generated by the hot end of the thermoelectric module and is injected into the intermediate pressure cavity of the compressor, converting the heat generated by the hot end into heating capacity. In another case, further, in order to strengthen the heat exchange effect between the ejector refrigerant and the hot end of the thermoelectric module, the hot end is designed as a cavity structure for fluorine-water heat exchange. The cold end and the hot end of the thermoelectric module work together to fully exert the thermoelectric module effect and synergistically improve the performance of the active ejector enthalpy-increasing, thereby improving the performance of the heat pump. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1(a): principle of a conventional supercooling ejector enthalpy-increasing heat pump;

[0023] Figure 1(b): cycle pressure-enthalpy diagram of a conventional supercooling ejector enthalpy-increasing heat pump;

[0024] Figure 2(a): principle diagram of an active ejector enthalpy-increasing heat pump;

[0025] Figure 2(b): cycle pressure-enthalpy diagram of an active ejector enthalpy-increasing heat pump;

[0026] Figure 3(a): principle diagram of a heat pump application one based on the synergistic effect of thermoelectric effect and active ejector enthalpy-increasing;

[0027] Figure 3(b): principle diagram of a heat pump application two based on the synergistic effect of thermoelectric effect and active ejector enthalpy-increasing;

[0028] Figure 3(c): cycle pressure-enthalpy diagram of a heat pump based on the synergistic effect of thermoelectric effect and active ejector enthalpy-increasing;

[0029] Figure 4 Figure 4: flow path diagram of a heat pump system based on the synergistic effect of thermoelectric effect and active ejector enthalpy-increasing in Example 1;

[0030] Figure 5 Figure 5: internal structure diagram of the cold end of a thermoelectric module;

[0031] Figure 6 Figure 6: flow path diagram of a heat pump system based on the synergistic effect of thermoelectric effect and active ejector enthalpy-increasing in Example 2;

[0032] Figure 7 Figure 7: internal structure diagram of the hot end of a thermoelectric module;

[0033] Figure 8Control flow diagram of heat pump based on thermoelectric effect and active ejection enthalpy synergy.

[0034] Reference signs:

[0035] 1, variable frequency compressor; 2, high pressure pressure sensor; 3, oil separator; 4, four-way valve; 5, outdoor heat exchanger; 6, main electronic expansion valve; 7, liquid storage tank; 10, gas-liquid separator; 11, oil return capillary; 20, thermoelectric module; 21, thermoelectric cold end; 22, thermoelectric hot end; 23, direct current power supply; 30, ejection enthalpy electronic expansion valve; 31, active ejection inlet pipe; 32, economizer; 33, active ejection outlet pipe; 34, water pump; 41, condenser; 42, heating water pump; 51, exhaust gas temperature sensor; 52, outdoor temperature sensor; 53, coil temperature sensor; 54, suction temperature sensor; 55, liquid pipe temperature sensor; 56, thermoelectric module hot end temperature sensor; 57, ejection inlet pipe temperature sensor; 58, return water temperature sensor; 59, outlet water temperature sensor. DETAILED DESCRIPTION

[0036] The specific embodiments of the present application are further described in detail below with reference to the accompanying drawings, so that the technical scheme of the present application is easier to understand and master.

[0037] The conventional supercooling ejection enthalpy principle is shown in FIG. 1(a) and FIG. 1(b), and the active ejection enthalpy principle for increasing supercooling degree is shown in FIG. 2(a) and FIG. 2(b). In the figures, m K m is the mass flow rate of refrigerant flowing into the evaporator, iK1 m is the ejection refrigerant flow rate of conventional supercooling ejection enthalpy, iK2 m is the ejection refrigerant flow rate of active ejection enthalpy.

[0038] For the conventional supercooling ejection enthalpy system, the opening degree of the ejection enthalpy electronic expansion valve is adjusted to increase the supercooling degree to absorb more air energy, and the compressor quasi-secondary compressor is used to increase the compression work, thereby improving the unit performance. For the active ejection enthalpy based on external heat source and the active ejection enthalpy based on thermoelectric effect, see FIG. 2(a), FIG. 3(a) and FIG. 3(b), the heat of the external heat source is converted into heating capacity in the form of ejection enthalpy difference by adjusting the ejection enthalpy electronic expansion valve, and the compression work is increased by the compressor quasi-secondary compressor, thereby greatly improving the unit performance. The difference between the two is that for the active ejection enthalpy based on thermoelectric effect, the liquid pipe section is embedded in the cold end of the thermoelectric module to exchange heat, thereby reducing the liquid pipe temperature and increasing the supercooling degree to absorb more air energy. The thermodynamic cycle analysis of the two ejection enthalpy modes is as follows.

[0039] In FIG. 1(b), according to the heat pump cycle theory, for the conventional supercooling ejection enthalpy, the heat pump heating capacity can be expressed as:

[0040] (1)

[0041] wherein: are the air energy and compression work absorbed by the evaporator, respectively. The calculation expression is:

[0042] (2a)

[0043] Compression work is the sum of the two-stage compression work, and the expression is:

[0044] (2b)

[0045] In FIG. 2(b) and FIG. 3(c), for the active jet energy-increasing heat pump based on external heat source and the heat pump based on thermoelectric effect and synergistic effect with active jet energy-increasing, the heat pump heating capacity can be expressed as:

[0046] (3)

[0047] wherein: , , are the heating capacity, air energy and compression work absorbed by the evaporator, respectively, The calculation expression is:

[0048] (4a)

[0049] is the jet energy-increasing enthalpy difference, and the calculation expression is:

[0050] (4b)

[0051] Obviously, for the conventional supercooling jet energy-increasing, more air energy is absorbed by increasing the supercooling degree, but the jet energy-increasing enthalpy difference cannot be included in the heating capacity, so the jet energy-increasing is limited to improve the heating capacity; for the active jet energy-increasing heat pump based on external heat source, the jet refrigerant absorbs the heat of the external heat source to convert into the heating capacity, but the supercooling degree is not increased; in the active jet energy-increasing based on thermoelectric effect of the present application, the refrigerant in the liquid pipe exchanges heat with the cold end of the thermoelectric module, the temperature of the liquid pipe is reduced, the supercooling degree can be increased, more air energy is absorbed, and the jet refrigerant absorbs the heat of the hot end of the thermoelectric module to convert into the heating capacity. How much external heat source heat is absorbed can be adjusted by adjusting the opening of the jet energy-increasing electronic expansion valve or the heat generation of the hot end of the thermoelectric module, and quantitative heat supplement can be realized.

[0052] The calculation expression of the supercooling jet energy-increasing heat pump performance coefficient COP is:

[0053] (5a)

[0054] The performance coefficient COP of the active jet heat pump is calculated as follows:

[0055] (5b)

[0056] Embodiment 1:

[0057] Referring to Figure 4 As shown in the figure, the heat pump based on the synergistic effect of thermoelectric effect and active jet heat addition includes a heat pump host module, an active jet heat addition module, and a thermoelectric module. The heat pump host module includes a variable frequency compressor 1, an oil separator 3, a four-way valve 4, a condenser 41, a liquid storage tank 7, an outdoor heat exchanger 5, and a gas-liquid separator 10 connected in sequence and forms a main refrigerant circulation loop. In addition, a heating water pump 42 is installed on the water outlet pipe of the condenser 41.

[0058] The exhaust pipe of the variable frequency compressor 1 is connected to the d pipe of the four-way valve 4 through the oil separator 3. The c pipe of the four-way valve 4 is connected to one end of the outdoor heat exchanger 5. The e pipe of the four-way valve 4 is connected to the gas pipe of the condenser 41 through the main gas pipe. The s pipe of the four-way valve 4 is connected to the inlet pipe of the gas-liquid separator 10. The outlet pipe of the gas-liquid separator 10 is connected to the return gas pipe of the variable frequency compressor 1. The other end of the outdoor heat exchanger 5 is connected to the main liquid pipe. The other end of the outdoor heat exchanger 5 is connected to the liquid pipe of the condenser 41 through the main liquid pipe and the liquid storage tank 7.

[0059] The active jet heat addition module includes an active jet inlet pipe 31, an active jet outlet pipe 33, and a jet heat addition electronic expansion valve 30. One end of the active jet inlet pipe is connected to the main liquid pipe. The jet heat addition electronic expansion valve 30 is installed on the active jet inlet pipe. One end of the active jet outlet pipe 31 is connected to the intermediate pressure cavity connection pipe of the variable frequency compressor 1.

[0060] Referring to Figure 4 Flow path one and flow path two respectively represent two connection positions of the active jet inlet pipe 31. Flow path one represents that the active jet inlet pipe 31 is connected to the main liquid pipe at the front end of the hot end module 20, i.e., the refrigerant is divided into two paths before entering the hot end module 20, one path enters the active jet inlet pipe 31, and the other path enters the cold end of the hot end module 20. Flow path two represents that the active jet inlet pipe 31 is connected to the main liquid pipe at the rear end of the hot end module 20, i.e., the refrigerant is divided into two paths after flowing through the thermoelectric cold end 21 of the hot end module 20, one path flows to the outdoor heat exchanger 5, and the other path flows to the thermoelectric hot end 22 through the active jet inlet pipe 31.

[0061] The thermoelectric module 20 comprises a thermoelectric cold end 21, a thermoelectric hot end 22, staggered P-type and N-type thermoelectric semiconductors, and a direct current power supply 23. When current flows in the closed circuit, one end of the thermoelectric module cools down and the other end heats up, corresponding to the cold end and the hot end of the thermoelectric module respectively. One of the refrigerants flowing through the main liquid pipe exchanges heat with the thermoelectric cold end 21, and the other refrigerant flowing through the main liquid pipe exchanges heat with the thermoelectric hot end 22 through the active injection inlet pipe 31, the jet enthalpy increasing electronic expansion valve 30, and the active injection outlet pipe 33. In this embodiment, the active injection outlet pipe 33 is embedded in the thermoelectric hot end 22 of the thermoelectric module after passing through the jet enthalpy increasing electronic expansion valve 30, and the refrigerant flowing through the active injection outlet pipe 31 directly exchanges heat with the thermoelectric hot end 22.

[0062] In this embodiment, a temperature detection module is also provided, which comprises an exhaust temperature sensor 51, an outdoor environment temperature sensor 52, a coil temperature sensor 53 on the outdoor heat exchanger, an air intake temperature sensor 54, a liquid pipe temperature sensor 55, a thermoelectric module hot end temperature sensor 56, an injection inlet pipe temperature sensor 57, a return water temperature sensor 58, and a water outlet temperature sensor 59.

[0063] The exhaust temperature sensor 51 is used to detect the exhaust temperature T d , the outdoor environment temperature sensor 52 is used to detect the outdoor environment temperature T ao , the air intake temperature sensor 54 is used to detect the air intake temperature T s , the coil temperature sensor 53 is used to detect the coil temperature T def , the liquid pipe temperature sensor 55 is used to detect the liquid pipe temperature T liq , the thermoelectric module hot end temperature sensor 56 is used to detect the temperature T therm,e,h of the thermoelectric hot end 22, the injection inlet pipe temperature sensor 57 is used to detect the temperature T inj,in of the active injection inlet pipe. The return water temperature sensor 59 is used to detect the return water temperature T w,in of the condenser, and the water outlet temperature sensor 59 is used to detect the water outlet temperature T w,out of the condenser.

[0064] In this embodiment, the thermoelectric module 20 is powered by the direct current power supply 23, the thermoelectric hot end 22 of the thermoelectric module 20 generates heat, and the thermoelectric cold end 21 of the thermoelectric module 20 generates cold. The active injection outlet pipe 31 is embedded in the thermoelectric cold end 21, and the refrigerant in the liquid pipe exchanges heat with the thermoelectric cold end 21, thereby increasing the supercooling degree to absorb more air energy.

[0065] The structure of the thermoelectric cold end 21 is shown in Figure 5 , and the thermoelectric cold end 21 is embedded with a winding heat exchange pipe for refrigerant circulation, which increases the heat exchange area to improve the heat exchange effect.

[0066] The embodiment is further introduced in combination with a heat pump flow path diagram:

[0067] The flow path diagram is shown in Figure 4 Taking flow path one as an example, the refrigerant discharged by the variable frequency compressor 1 passes through the oil separator 3, the d pipe of the four-way valve 5, the e pipe of the four-way valve 5, and then enters the condenser 41 to exchange heat. Then, the refrigerant passes through the high-pressure liquid storage tank 7 and is divided into two paths. One path of the refrigerant exchanges heat with the thermoelectric cold end of the thermoelectric module 20, thereby reducing the temperature of the refrigerant in this path. The refrigerant in this path passes through the main electronic expansion valve 6, the outdoor heat exchanger 5, the c pipe and the s pipe of the four-way valve, and then returns to the variable frequency compressor 1 through the gas-liquid separator. The other path of the refrigerant exchanges heat with the thermoelectric hot end 22 after passing through the active injection inlet pipe 31 and the ejection gas enthalpy increasing electronic expansion valve 30. Then, the refrigerant returns to the intermediate pressure cavity of the variable frequency compressor 1 after passing through the active injection outlet pipe 31.

[0068] Similarly, the flow path one has been described above, and the flow path two is different from the flow path one only in the specific position of the active injection inlet pipe 31 connected to the main liquid pipe. Therefore, the description is not repeated.

[0069] Please refer to Figure 8 The heat pump control method based on the thermoelectric effect and the active ejection gas enthalpy increasing synergistic effect includes the following steps:

[0070] S1: A preset active ejection gas enthalpy increasing opening condition is configured, and when the active ejection gas enthalpy increasing opening condition is met, the active ejection gas enthalpy increasing operation control is started.

[0071] S2: A preset active ejection gas enthalpy increasing closing condition is configured, and when the active ejection gas enthalpy increasing closing condition is met, the active ejection gas enthalpy increasing operation control is stopped.

[0072] The active ejection gas enthalpy increasing opening condition is specifically that the heat pump is started to operate, and the thermoelectric hot end temperature T therm-e,h detected by the thermoelectric hot end temperature sensor 56 is greater than the liquid pipe temperature T liq detected by the liquid pipe temperature sensor 55 + a preset temperature difference threshold ΔT liq .

[0073] The active ejection gas enthalpy increasing closing condition is specifically that the thermoelectric hot end temperature T therm-e,h detected by the thermoelectric hot end temperature sensor 56 is less than or equal to the injection inlet pipe temperature T inj,in detected by the injection inlet pipe temperature sensor 57 + a preset temperature difference threshold ΔT inj,in , or the thermoelectric hot end temperature T therm-e,h is less than or equal to the initial hot end temperature T therm-e,h,0 + a preset temperature difference threshold ΔT therm-e,h,0 , the initial hot end temperature T therm-e,h,0 is specifically the temperature of the thermoelectric hot end before the thermoelectric module is started to operate.

[0074] The specific control content is as follows:

[0075] When the heat pump host module receives the heating start instruction, the heat pump starts to run, the variable frequency compressor 1 is started, the fan of the outdoor heat exchanger 5 is started, the main electronic expansion valve 6 is opened to a certain initial opening degree, and the heating water pump 42 runs. The thermoelectric module 20 is powered on.

[0076] For case 1, when it is detected that the temperature T therm-e,h detected by the hot end temperature sensor 56 of the thermoelectric module is higher than the liquid pipe temperature T liq detected by the liquid pipe temperature sensor 55 + a preset temperature hysteresis threshold value ΔT liq , the ejector enhanced enthalpy electronic expansion valve 30 is opened to a certain initial opening degree, and runs for a period of time t minutes. The opening degree of the ejector enhanced enthalpy electronic expansion valve 30 is adjusted by controlling the hot end temperature of the thermoelectric module. The adjustment method is as follows:

[0077] After the heat pump starts to run, the hot end temperature T therm-e,h of the thermoelectric module is detected in real time. It is assumed that the initial temperature of the thermoelectric module before starting to work is T therm-e,h,0 , the control target is T therm-e,h,tar , and the control method is to adjust the opening degree of the ejector enhanced enthalpy electronic expansion valve 30 so that the hot end temperature T therm-e,h of the thermoelectric module is equal to the target temperature T therm-e,h,tar . In order to absorb as much heat as possible from the hot end of the thermoelectric module, the target temperature T therm-e,h,tar is set to the initial temperature T therm-e,h,0 of the hot end + a temperature compensation value ΔT X . When the detected hot end temperature T therm-e,h is higher than T therm-e,h,tar + a preset target temperature hysteresis threshold value ΔT therm-e,h,tar , the opening degree of the ejector enhanced enthalpy electronic expansion valve 30 is increased. When the detected hot end temperature T therm-e,h is less than T therm-e,h,tar - a preset target temperature hysteresis ΔT therm-e,h,tar , but greater than the initial temperature T therm-e,h,0 + a preset temperature hysteresis ΔT therm-e,h,0 , the opening degree of the ejector enhanced enthalpy electronic expansion valve 30 is reduced. When the hot end temperature T therm-e,h is lower than or equal to T therm-e,h,tar + a preset target temperature hysteresis ΔT therm-e,h,tar , greater than or equal to T therm-e,h,tar - a preset target temperature hysteresis threshold value ΔT therm-e,h,tar , the opening degree of the ejector enhanced enthalpy electronic expansion valve 30 remains unchanged. When the current hot end temperature T therm-e,h is lower than or equal to the initial temperature T therm-e,h,0 of the hot end + ΔTtherm-e,h,0 When the temperature T therm-e,h detected by the hot side temperature sensor 56 is lower than or equal to the temperature T inj,in + ΔT inj,in detected by the injection pipe temperature sensor 57, the ejector enhanced electronic expansion valve 30 is closed.

[0078] Embodiment 2:

[0079] Different from Embodiment 1, in order to strengthen the heat exchange effect between the injection refrigerant and the hot side of the thermoelectric module, the hot side is designed as a cavity structure for fluorine-water heat exchange. In addition, the flow path one and the flow path two are the same as those in Embodiment 1, and are two different connection positions of the active injection pipe 31.

[0080] Please refer to Figure 6 , the active ejector enhanced module further comprises an economizer 32, the economizer 32 is connected to the main liquid pipe through the active injection pipe, the economizer 32 is connected to the intermediate pressure cavity connection pipe of the variable frequency compressor 1 through the active injection pipe 31, the economizer 32 is connected with a hot water circulation pipeline, a water pump 34 is installed on the hot water circulation pipeline, the water pump 34 drives the hot water to circulate in the hot water circulation pipeline, so that the hot water exchanges heat with the injection refrigerant in the economizer 32, and the refrigerant after absorbing the heat of the hot water is injected into the intermediate pressure cavity of the variable frequency compressor 1. Please refer to Figure 7 , the hot side 22 of the thermoelectric module is provided with a heat exchange cavity for the hot water to flow through.

[0081] Please refer to Figure 6 , taking the flow path one as an example, the refrigerant discharged from the variable frequency compressor 1 passes through the oil separator 3, the d pipe of the four-way valve 5, the e pipe of the four-way valve 5, enters the hydraulic module and exchanges heat with the condenser 41, and then the refrigerant passes through the high-pressure liquid storage tank 7 and is divided into two paths, one path of the refrigerant exchanges heat with the cold side of the thermoelectric module 20, reduces the temperature of the refrigerant, passes through the main electronic expansion valve 6, the outdoor heat exchanger 5, the c pipe and the s pipe of the four-way valve, and returns to the variable frequency compressor 1 through the gas-liquid separator, and the other path of the refrigerant exchanges heat with the hot water in the economizer 32 after passing through the ejector enhanced electronic expansion valve 30, the water pump 34 pumps the hot water to circulate between the hot side 22 of the thermoelectric module and the economizer 32, the refrigerant flowing out of the economizer 32 returns to the intermediate pressure cavity of the variable frequency compressor 1 through the active injection pipe 31, and the injection refrigerant absorbs the heat generated by the hot side of the thermoelectric module and is injected into the intermediate pressure cavity of the compressor, so as to convert the heat generated by the hot side into heating capacity.

[0082] Similarly, the flow path one has been described above, and the flow path two is only different from the flow path one in the specific position of the active injection pipe 31 connected to the main liquid pipe, so the description is not repeated.

[0083] The embodiment 2 has been described in detail in the applied patent, and will not be described again.

[0084] When the unit is stopped, to prevent the cold water in the jet augmenting enthalpy pipeline from expanding and damaging the pipeline due to icing, the direct current power supply 21 is controlled, and when the temperature detected by the thermoelectric module hot end temperature sensor 56 is lower than 2°C, the power supply is turned on to supply power; when the temperature detected by the thermoelectric module hot end temperature sensor 56 is higher than 6°C, the power supply is turned off, and when the water temperature of the thermoelectric module hot end is between 2°C and 6°C, the power supply maintains the current state.

[0085] Of course, the above is only a typical example of the present application, and in addition to this, the present application can have other various specific embodiments, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. A heat pump based on synergistic effect of thermoelectric effect and active jet propulsive enthalpy augmentation, characterized in that: The heat pump comprises a heat pump host module, an active jet enthalpy increasing module and a thermoelectric module, the heat pump host module comprises a variable frequency compressor (1), an oil separator (3), a four-way valve (4), a condenser (41), a liquid storage tank (7), an outdoor heat exchanger (5) and a gas-liquid separator (10) connected in sequence, and forms a main circuit of refrigerant circulation; The active jet enthalpy increasing module comprises an active jet inlet pipe (31), an active jet outlet pipe (33) and a jet enthalpy increasing electronic expansion valve (30), one end of the active jet inlet pipe (31) is connected to a main liquid pipe, the jet enthalpy increasing electronic expansion valve (30) is installed on the active jet inlet pipe (31), and one end of the active jet outlet pipe (33) is connected to an intermediate pressure cavity connecting pipe of the variable frequency compressor (1). The thermoelectric module (20) comprises a thermoelectric cold end (21) and a thermoelectric hot end (22), one of the refrigerants flowing through the main liquid pipe exchanges heat with the thermoelectric cold end (21), and the other of the refrigerants flowing through the main liquid pipe exchanges heat with the thermoelectric hot end (22) through the active jet inlet pipe (31) and the jet enthalpy increasing electronic expansion valve (30), and the jet refrigerant is jetted to the intermediate pressure cavity of the variable frequency compressor (1) after absorbing the heat generated by the thermoelectric hot end (22). The heat pump is provided with an active jet enthalpy increasing opening condition and an active jet enthalpy increasing closing condition, when the active jet enthalpy increasing opening condition is met, the jet enthalpy increasing electronic expansion valve (30) is opened to perform active jet enthalpy increasing operation control, and when the active jet enthalpy increasing closing condition is met, the jet enthalpy increasing electronic expansion valve (30) is closed to end the active jet enthalpy increasing operation control. The active jet augmentation opening condition is specifically that the heat pump is in operation, and the thermoelectric module hot end temperature sensor (56) detects the thermoelectric hot end temperature T therm-e,h greater than the liquid pipe temperature T detected by the liquid pipe temperature sensor (55) liq + a preset temperature hysteresis threshold ΔT liq ; The active gas injection enthalpy boost off condition is specifically that the thermoelectric hot side temperature T therm-e,h is less than or equal to the injection pipe temperature T inj,in + a preset temperature hysteresis threshold ΔT inj,in , or the thermoelectric hot side temperature T therm-e,h is less than or equal to the hot side initial temperature T therm-e,h,0 + a preset temperature hysteresis threshold ΔT therm-e,h,0 , the hot side initial temperature T therm-e,h,0 is specifically the temperature of the thermoelectric module hot side before the thermoelectric module is operated.

2. The heat pump based on synergistic effect of thermoelectric effect and active jet propulsive enthalpy increase according to claim 1, characterized in that: The active jet enthalpy increasing module further comprises an economizer (32), the economizer (32) is communicated with the main liquid pipe of the front end or the rear end of the thermoelectric module (20) through the active jet inlet pipe (31), the economizer (32) is connected to the intermediate pressure cavity connecting pipe of the variable frequency compressor (1) through the active jet outlet pipe (31), the economizer (32) is connected with a hot water circulation pipeline, a water pump (34) is installed on the hot water circulation pipeline, and the water pump (34) pumps hot water to circulate in the hot water circulation pipeline, so that the hot water exchanges heat with the jet refrigerant in the economizer (32), and the refrigerant after absorbing the heat of the hot water is jetted to the intermediate pressure cavity of the variable frequency compressor (1).

3. The heat pump based on synergistic effect of thermoelectric effect and active jet propulsive enthalpy increase according to claim 1, characterized in that: An exhaust pipe of the variable frequency compressor (1) is connected to a d pipe of the four-way valve (4) through the oil separator (3), a c pipe of the four-way valve (4) is connected to one end of the outdoor heat exchanger (5), an e pipe of the four-way valve (4) is connected to a gas pipe of the condenser (41) through a main gas pipe, an s pipe of the four-way valve (4) is connected to an inlet pipe of the gas-liquid separator (10), an outlet pipe of the gas-liquid separator (10) is connected to a back gas pipe of the variable frequency compressor (1), the other end of the outdoor heat exchanger (5) is connected to a liquid pipe of the condenser (41) through a main liquid pipe, and a heating water pump (42) is installed on a water outlet pipe of a condensing side of the condenser (41).

4. The heat pump based on synergistic effect of thermoelectric effect and active jet propulsive enthalpy increase according to claim 1, characterized in that: Also include temperature detection module, the temperature detection module includes exhaust temperature sensor (51), outdoor environment temperature sensor (52), outdoor heat exchanger on the coil temperature sensor (53), suction temperature sensor (54), liquid pipe temperature sensor (55) and thermoelectric module hot end temperature sensor (56), injection into pipe temperature sensor (57), The exhaust gas temperature sensor (51) is used to detect the exhaust gas temperature T d The outdoor ambient temperature sensor (52) is used to detect the outdoor ambient temperature T ao The suction gas temperature sensor (54) is used to detect the suction gas temperature T s The coil temperature sensor (53) is used to detect the coil temperature T def The liquid pipe temperature sensor (55) is used to detect the liquid pipe temperature T liq The thermoelectric module hot end temperature sensor (56) is used to detect the temperature T of the thermoelectric hot end (22) therm-e,h The injection inlet pipe temperature sensor (57) is used to detect the temperature T of the active injection inlet pipe inj,in .

5. The heat pump based on synergistic effect of thermoelectric effect and active jet propulsive enthalpy increase according to claim 4, characterized in that: The condensing side comprises the condenser (41), a heating water pump (42), a return water temperature sensor (58) for detecting the return water temperature T w,in of the condenser and an outlet water temperature sensor (59) for detecting the outlet water temperature T w,out of the condenser.

6. A control method for a heat pump based on synergistic enhancement of thermoelectric effect and active jet augmentation, applied to the heat pump based on synergistic enhancement of thermoelectric effect and active jet augmentation according to any one of claims 1-5, characterized in that: The control method comprises S1: configured with preset active jet augmenting enthalpy opening condition, when the active jet augmenting enthalpy opening condition is satisfied, active jet augmenting enthalpy operation control is started; S2: configured with preset active jet augmenting enthalpy closing condition, when the active jet augmenting enthalpy closing condition is satisfied, active jet augmenting enthalpy operation control is closed; The active jet augmentation opening condition is specifically that the heat pump is in operation, and the thermoelectric module hot end temperature sensor (56) detects the thermoelectric hot end temperature T therm-e,h greater than the liquid pipe temperature T detected by the liquid pipe temperature sensor (55) liq + a preset temperature hysteresis threshold ΔT liq ; The active jet-reheat on condition is specifically that the thermoelectric hot end temperature T therm-e,h is less than or equal to the jet-in pipe temperature T inj,in + a preset temperature hysteresis threshold ΔT inj,in , or the thermoelectric hot end temperature T therm-e,h is less than or equal to the hot end initial temperature T therm-e,h,0 + a preset temperature hysteresis threshold ΔT therm-e,h,0 , the hot end initial temperature T therm-e,h,0 is specifically the temperature of the thermoelectric hot end before the thermoelectric module is operated.

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