Ultralow-temperature heat pump system
By introducing exhaust sensors and unloading valve control into the ultra-low temperature heat pump system, automatic pressure relief and cooling are achieved, and the problems of low energy efficiency and unstable operation of the heat pump in low temperature environments are solved, and the energy efficiency and reliability of the system are improved.
Patent Information
- Application Number
- CN202422367192.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-09-27
AI Technical Summary
The existing heat pumps have reduced energy efficiency in low temperature environments, and the system pressure and temperature are unstable, which can easily trigger protective shutdown, affecting operating stability and reliability.
An ultra-low temperature heat pump system is designed, which uses exhaust temperature and pressure sensor monitoring, and controls pressure relief and cooling through heating and unloading valves and refrigeration and unloading valves. Combining different conduction methods of electronic expansion valves and four-way valves, automatic pressure relief and cooling are achieved to ensure system stability.
It improves the energy efficiency of the heat pump, ensures the system to operate stably in a low-temperature environment, avoids shutdown caused by excessive pressure and temperature, and enhances the reliability of the system.
Smart Images
Figure CN223271466U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat pumps, in particular to an ultra-low temperature heat pump system. Background Art
[0002] A heat pump is an energy-saving device that uses high-level energy to transfer heat from a low-level heat source to a high-level heat source.
[0003] Plate heat exchanger is a high-efficiency heat exchanger composed of a series of stacked metal sheets with a certain corrugated shape.
[0004] Not only does the energy efficiency of heat pumps decrease in low temperature environments, but they are also affected by various factors. When the water temperature is relatively high or the water flow is unstable, the system pressure and exhaust temperature are also relatively high, which can easily trigger pressure protection or temperature protection and cause shutdown, affecting the normal and stable operation of the unit and resulting in poor performance.
[0005] To this end, we designed an ultra-low temperature heat pump system that not only improves the energy efficiency of the heat pump, but also automatically relieves pressure and reduces temperature to ensure the stability and reliability of the system operation. Utility Model Content
[0006] The technical problem to be solved by the utility model is to overcome the defects of the existing technology. The utility model proposes an ultra-low temperature heat pump system, which can not only improve the energy efficiency of the heat pump, but also automatically relieve pressure and reduce temperature to ensure the stability and reliability of the system operation.
[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: an ultra-low temperature heat pump system, comprising:
[0008] The system comprises a compressor, wherein the exhaust port of the compressor is connected to the D end of the four-way valve through an exhaust pipeline, the E end of the four-way valve is connected to the input end of the plate heat exchanger, the output end of the plate heat exchanger is connected to one end of the liquid reservoir, the other end of the liquid reservoir is connected to a main path and an auxiliary path, the main path is connected to the main liquid inlet of the economizer, the auxiliary path is connected to the input end of the auxiliary electronic expansion valve through an enthalpy increase solenoid valve, and the output end of the auxiliary electronic expansion valve is connected to the auxiliary air inlet of the economizer; the main liquid outlet of the economizer is connected to the input end of the main electronic expansion valve, the output end of the main electronic expansion valve is connected to the input end of the fin heat exchanger, the output end of the fin heat exchanger is connected to the C end of the four-way valve, and the S end of the four-way valve is connected to the air intake of the compressor; the auxiliary air outlet of the economizer is connected to the middle air intake of the compressor;
[0009] An exhaust temperature sensor and an exhaust pressure sensor are installed on the exhaust pipe of the compressor.
[0010] Furthermore, a branch is led out from the main liquid outlet of the economizer and connected to the input end of the heating unloading valve, the output end of the heating unloading valve is connected to the input end of the heating unloading capillary, and the output end of the heating unloading capillary is connected to the output end of the fin heat exchanger. When the heating operation is in progress, the DE end of the four-way valve and the CS end are turned on. When the temperature detected by the exhaust temperature sensor is ≥ the exhaust protection temperature -5°C or the pressure detected by the exhaust pressure sensor is ≥ the exhaust pressure protection value -2bar, the refrigeration unloading valve is opened and the pressure is relieved and the temperature is cooled through the refrigeration unloading capillary; when the temperature detected by the exhaust temperature sensor is ≤ the exhaust protection temperature -20°C or the pressure detected by the exhaust pressure sensor is ≤ the exhaust pressure protection value -5bar, the refrigeration unloading valve is closed and the pressure relief and cooling are stopped.
[0011] Furthermore, a branch is led out from the output end of the main electronic expansion valve and connected to the input end of the refrigeration unloading valve, the output end of the refrigeration unloading valve is connected to the input end of the refrigeration unloading capillary, and the output end of the refrigeration unloading capillary is connected to the input end of the plate exchanger. When the refrigeration operation is in progress, the DC end of the four-way valve is turned on and the ES end is turned on. When the temperature detected by the exhaust temperature sensor is ≥ the exhaust protection temperature -5°C or the exhaust pressure is ≥ the exhaust pressure protection value -2bar, the refrigeration unloading valve is opened and the pressure is relieved and the temperature is cooled through the refrigeration unloading capillary; when the exhaust temperature is ≤ the exhaust protection temperature -20°C or the exhaust pressure is ≤ the exhaust pressure protection value -5bar, the refrigeration unloading valve is closed and the pressure relief and cooling are stopped.
[0012] Furthermore, the other end of the liquid reservoir is connected to one end of a first filter, and the other end of the first filter is communicated with the main path and the auxiliary path.
[0013] Furthermore, the output end of the main electronic expansion valve is connected to the input end of the fin heat exchanger through a second filter.
[0014] Compared with the prior art, the beneficial effects of the present invention include:
[0015] The utility model provides an ultra-low temperature heat pump system, which can not only improve the energy efficiency of the heat pump, but also automatically relieve pressure and reduce temperature to ensure the stability and reliability of system operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them:
[0017] Figure 1 This is a heating flow chart of an ultra-low temperature heat pump system of the utility model;
[0018] Figure 2This is a refrigeration flow chart of an ultra-low temperature heat pump system of the utility model.
[0019] Numbers in the figure: 1-compressor; 2-plate heat exchanger; 3-fin heat exchanger; 4-liquid reservoir; 5-economizer; 6-four-way valve; 7-main electronic expansion valve; 8-auxiliary electronic expansion valve; 9-enthalpy increase solenoid valve; 10-heating unloading valve; 11-cooling unloading valve; 12-first filter; 13-second filter; 14-exhaust temperature sensor; 15-exhaust pressure sensor; 16-heating unloading capillary; 17-cooling unloading capillary. DETAILED DESCRIPTION
[0020] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural methods and implementation methods. Therefore, the following specific embodiments and drawings are only illustrative of the technical solution of the present invention and should not be regarded as the entire present invention or as a limitation or restriction of the technical solution of the present invention.
[0021] Example:
[0022] A super-low temperature heat pump system, which includes a compressor 1, the exhaust port of the compressor 1 is connected to the D end of the four-way valve 6, the E end of the four-way valve 6 is connected to the input end of the plate exchanger 2, the output end of the plate exchanger 2 is connected to one end of the liquid reservoir 4, and the other end of the liquid reservoir 4 is connected to one end of the first filter 12; the other end of the first filter 12 is divided into a main path and an auxiliary path, the main path is connected to the main liquid inlet of the economizer 5, the auxiliary path is connected to the input end of the auxiliary electronic expansion valve 8 through the enthalpy increase solenoid valve 9, and the output end of the auxiliary electronic expansion valve 8 is connected to the auxiliary air inlet of the economizer 5; the main liquid outlet of the economizer 5 is connected to the input end of the main electronic expansion valve 7, and the output end of the main electronic expansion valve 7 is connected to the input end of the fin heat exchanger 3 through the second filter 13, and the output end of the fin heat exchanger 3 is connected to the four-way The C end of the valve 6 is connected, and the S end of the four-way valve 6 is connected to the intake port of the compressor 1; the auxiliary air outlet of the economizer 5 is connected to the middle intake port of the compressor 1; the main liquid outlet of the economizer 5 leads out a branch and is connected to the input end of the heating unloading valve 10, and the output end of the heating unloading valve 10 is connected to the input end of the heating unloading capillary 16, and the output end of the heating unloading capillary 16 is connected to the output end of the fin heat exchanger 3; the output end of the main electronic expansion valve 7 leads out a branch and is connected to the input end of the refrigeration unloading valve 11, and the output end of the refrigeration unloading valve 11 is connected to the input end of the refrigeration unloading capillary 17, and the output end of the refrigeration unloading capillary 17 is connected to the input end of the plate exchanger 2; an exhaust temperature sensor 14 and an exhaust pressure sensor 15 are installed on the exhaust pipe of the compressor 1.
[0023] Figure 1 This is a heating flow chart of an ultra-low temperature heat pump system of the present invention: the DE end and CS end of the four-way valve 6 are turned on, the compressor 1 is started, the high-temperature and high-pressure refrigerant passes through the four-way valve 6 to the plate exchanger 2 for heat exchange with water and condensation, the condensed refrigerant passes through the liquid reservoir 4, the first filter 12, the economizer 5 main line in turn to the main electronic expansion valve 7 for throttling and pressure reduction, the throttled and pressure-reduced refrigerant passes through the second filter 13 to the fin heat exchanger 3 for evaporation and heat absorption, and the low-temperature and low-pressure gaseous refrigerant after evaporation and heat absorption returns to the suction port of the compressor 1 through the CS end of the four-way valve 6; when the ambient temperature is lower than 7°C , the enthalpy increase solenoid valve 9 opens, and the refrigerant reaches the economizer 5 after throttling and reducing the pressure through the auxiliary electronic expansion valve 8 to evaporate and absorb heat. The low-temperature and low-pressure gaseous refrigerant after evaporation and heat absorption returns to the suction port of the compressor 1; when the system detects that the exhaust temperature is ≥ the exhaust protection temperature -5°C or the exhaust pressure is ≥ the exhaust pressure protection value -2bar, the heating unloading valve 10 is opened, and the pressure is relieved and the temperature is lowered through the heating unloading capillary 16; when the exhaust temperature is ≤ the exhaust protection temperature -20°C or the exhaust pressure is ≤ the exhaust pressure protection value -5bar, the heating unloading valve 10 is closed to stop the pressure relief and cooling;
[0024] Figure 2 This is a refrigeration flow chart of an ultra-low temperature heat pump system of the present invention: the DC end and the ES end of the four-way valve 6 are turned on, the compressor 1 is started, and the high-temperature and high-pressure refrigerant reaches the fin heat exchanger 3 through the DC end of the four-way valve 6 to exchange heat with the air and condense. The condensed refrigerant passes through the second filter 13 to reach the main electronic expansion valve 7 for throttling and pressure reduction. The refrigerant after throttling and pressure reduction passes through the main circuit of the economizer 5, the first filter 12, and the liquid reservoir 4 in turn to reach the plate exchanger 2 for evaporation and heat absorption. The low-temperature and low-pressure gaseous refrigerant after evaporation and heat absorption passes through the ES end of the four-way valve 6 back to the suction port of the compressor 1, and the enthalpy increase solenoid valve 9 remains closed; when the system detects that the exhaust temperature is ≥ the exhaust protection temperature -5°C or the exhaust pressure is ≥ the exhaust pressure protection value -2bar, the refrigeration unloading valve 11 is opened, and the pressure is relieved and the temperature is reduced through the refrigeration unloading capillary 17; when the exhaust temperature is ≤ the exhaust protection temperature -20°C or the exhaust pressure is ≤ the exhaust pressure protection value -5bar, the refrigeration unloading valve 11 is closed to stop the pressure relief and cooling.
[0025] The technical scope of the present invention is not limited to the contents described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical concept of the present invention, and these deformations and modifications should all fall within the scope of protection of the present invention.
Claims
1. An ultra-low temperature heat pump system, characterized in that: include: The invention comprises a compressor (1), wherein the exhaust port of the compressor (1) is connected to the D end of a four-way valve (6) through an exhaust pipe, the E end of the four-way valve (6) is connected to the input end of a plate heat exchanger (2), the output end of the plate heat exchanger (2) is connected to one end of a liquid reservoir (4), the other end of the liquid reservoir (4) is connected to a main road and an auxiliary road, the main road is connected to the main road liquid inlet of an economizer (5), the auxiliary road is connected to the input end of an auxiliary road electronic expansion valve (8) through an enthalpy increase solenoid valve (9), and the auxiliary road electronic expansion valve (8) is connected to the main road of the economizer (5). The output end of the expansion valve (8) is connected to the auxiliary air inlet of the economizer (5); the main liquid outlet of the economizer (5) is connected to the input end of the main electronic expansion valve (7); the output end of the main electronic expansion valve (7) is connected to the input end of the fin heat exchanger (3); the output end of the fin heat exchanger (3) is connected to the C end of the four-way valve (6); the S end of the four-way valve (6) is connected to the air intake of the compressor (1); the auxiliary air outlet of the economizer (5) is connected to the middle air intake of the compressor (1); An exhaust temperature sensor (14) and an exhaust pressure sensor (15) are installed on the exhaust pipe of the compressor (1).
2. The ultra-low temperature heat pump system according to claim 1, characterized in that: A branch is led out from the main liquid outlet of the economizer (5) and connected to the input end of the heating unloading valve (10). The output end of the heating unloading valve (10) is connected to the input end of the heating unloading capillary (16). The output end of the heating unloading capillary (16) is connected to the output end of the fin heat exchanger (3). When the heating operation is in progress, the DE end of the four-way valve (6) is turned on and the CS end is turned on. When the temperature detected by the exhaust temperature sensor (14) is greater than or equal to the exhaust protection temperature -5°C or the exhaust pressure sensor (15) is greater than or equal to the exhaust pressure protection value -2 bar, the heating unloading valve (10) is opened and pressure relief and cooling is performed through the heating unloading capillary (16). When the temperature detected by the exhaust temperature sensor (14) is less than or equal to the exhaust protection temperature -20°C or the exhaust pressure sensor (15) is less than or equal to the exhaust pressure protection value -5 bar, the heating unloading valve (10) is closed and pressure relief and cooling is stopped.
3. The ultra-low temperature heat pump system according to claim 2, characterized in that: The output end of the main electronic expansion valve (7) leads to a branch connected to the input end of the refrigeration unloading valve (11), the output end of the refrigeration unloading valve (11) is connected to the input end of the refrigeration unloading capillary (17), and the output end of the refrigeration unloading capillary (17) is connected to the input end of the plate exchanger (2). When the refrigeration operation is in progress, the DC end of the four-way valve (6) is turned on and the ES end is turned on. When the temperature detected by the exhaust temperature sensor (14) is ≥ the exhaust protection temperature -5°C or the pressure detected by the exhaust pressure sensor (15) is ≥ the exhaust pressure protection value -2 bar, the refrigeration unloading valve (11) is opened and pressure relief and cooling is performed through the refrigeration unloading capillary (17); when the temperature detected by the exhaust temperature sensor (14) is ≤ the exhaust protection temperature -20°C or the pressure detected by the exhaust pressure sensor (15) is ≤ the exhaust pressure protection value -5 bar, the refrigeration unloading valve (11) is closed and pressure relief and cooling is stopped.
4. The ultra-low temperature heat pump system according to claim 1, characterized in that: The other end of the liquid reservoir (4) is connected to one end of the first filter (12), and the other end of the first filter (12) is in communication with the main path and the auxiliary path.
5. The ultra-low temperature heat pump system according to claim 1, characterized in that: The output end of the main electronic expansion valve (7) is connected to the input end of the fin heat exchanger (3) through a second filter (13).