A -40 degree air source heat pump system
By installing a heating heat exchanger and a multi-stage heat exchanger in the air source heat pump system, the problem of frosting at low temperatures is solved, ensuring that the system can operate normally in an environment of -40 degrees Celsius, expanding the application range and optimizing the heating effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING AIJIA SUNSHINE TECH DEV CO LTD
- Filing Date
- 2022-11-29
- Publication Date
- 2026-07-21
AI Technical Summary
Air source heat pumps are prone to frosting in low-temperature and high-humidity environments, which leads to reduced refrigerant flow and pressure, preventing normal operation and limiting their application range.
Design a -40°C air source heat pump system, which includes a heating heat exchanger and a multi-stage heat exchanger structure. The heating heat exchanger is used to raise the system temperature, ensuring normal operation at extremely low temperatures.
It enables air source heat pumps to operate normally in an environment of -40 degrees Celsius, expanding the scope of application, and optimizes the heating effect through multi-stage heat exchangers, making it suitable for heating scenarios with different needs.
Smart Images
Figure CN115773593B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of air source heat pump systems, specifically relating to a -40 degree air source heat pump system. Background Technology
[0002] With the continuous development and progress of society, from the earliest use of fire for heating to solar heating, and now to using the reverse Carnot cycle principle to extract heat energy from the air and then compressing it with a compressor to increase the heat energy for heating, our heating technology has made great progress. Compared to traditional solar water heaters, air source heat pumps can continuously heat and provide hot water, making them suitable for various centralized hot water projects. They can also operate unattended and fully automatically. Compared to gas, electric, or electric-assisted heating solar water heaters, air source heat pumps have the lowest annual operating costs, costing approximately 30% of gas water heaters and 25% of electric water heaters. The heat pump has a short recovery cycle, generating approximately 4 kWh of heat energy for every 1 kWh of electricity consumed. Furthermore, air source heat pumps have a small footprint, resembling an outdoor air conditioning unit, and can be directly connected to an insulated water tank or heating network, making them suitable for various buildings. They produce no pollution, no combustion emissions, and pose no harm to human health, offering significant social benefits. However, in low-temperature, high-humidity environments, the evaporator of an air source heat pump is prone to frosting, leading to reduced refrigerant flow and pressure, preventing normal operation and limiting its application range. Therefore, providing a -40°C air source heat pump system is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0003] The main objective of this invention is to provide a -40°C air source heat pump system to solve the aforementioned technical problems. This device is equipped with a heat exchanger that supplies heat to the heating pipes, thereby raising the temperature within the air source heat pump system. The heating pipes ensure that the air source heat pump system can operate normally at a temperature of -40°C.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: A -40°C air source heat pump system includes an outdoor heat exchanger connected to a medium-pressure tank via a pipe. A valve is installed on the connecting pipe. The medium-pressure tank has a liquid outlet and a gas outlet. The liquid outlet is connected to a one-way valve via a pipe. The one-way valve is connected to a throttling device via a pipe. The throttling device is connected to a valve via a pipe. The valve is connected to a compressor via a pipe. The compressor is connected to a heating heat exchanger via a pipe. The heating heat exchanger is connected to an expansion valve via a pipe. The expansion valve is connected to the outdoor heat exchanger via a pipe. The heating heat exchanger is also connected to a heating pipe.
[0005] Furthermore, the air outlet on the medium-pressure tank is connected to compressor one via a pipe, the compressor is connected to throttling device three via a pipe, the throttling device three is connected to indoor heat exchanger one via a pipe, and the indoor heat exchanger one is connected to expansion valve via a pipe.
[0006] Furthermore, a branch pipe is provided on the pipe between the outdoor heat exchanger and valve one. The branch pipe is connected to the pipe between the gas-liquid separator and check valve two. Check valve one and throttling device two are provided on the branch pipe.
[0007] Furthermore, the gas-liquid separator is also connected to a second valve via a pipe, the second valve is connected to a second compressor via a pipe, the second compressor is connected to an indoor heat exchanger via a pipe, and the second indoor heat exchanger is connected to an expansion valve via a pipe.
[0008] Compared with the prior art, the present invention has the following beneficial effects: This invention includes a heating heat exchanger that heats the heating pipes to raise the temperature within the air source heat pump system. The heating pipes ensure the air source heat pump system can operate normally at temperatures as low as -40 degrees Celsius. The multi-stage design allows the device to be used in more situations; it can use only the second indoor heat exchanger for indoor heating, or it can use both the first indoor heat exchanger and the heating heat exchanger to operate the air source heat pump system in extremely low temperatures. Furthermore, the heating heat exchanger in this invention can be placed in different locations without overlapping its function with the second indoor heat exchanger. Attached Figure Description
[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0010] Figure 1 This is a schematic diagram of the structure of the present invention.
[0011] Among them, 1-outdoor heat exchanger, 2-valve one, 3-medium pressure tank, 4-one-way valve one, 5-one-way valve two, 6-throttling device one, 7-throttling device two, 8-compressor one, 9-gas-liquid separator, 10-valve two, 11-compressor two, 12-throttling device three, 13-valve three, 14-compressor three, 15-indoor heat exchanger one, 16-heating heat exchanger, 17-heating pipe, 18-indoor heat exchanger two, 19-expansion valve. Detailed Implementation
[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0013] like Figure 1 As shown, this invention provides a -40°C air source heat pump system, including an outdoor heat exchanger 1. The outdoor heat exchanger 1 is connected to a medium-pressure tank 3 via a pipe. A valve 2 is installed on the connecting pipe. The medium-pressure tank 3 is provided with a liquid outlet and a gas outlet. The liquid outlet is connected to a one-way valve 5 via a pipe. The one-way valve 5 is connected to a throttling device 6 via a pipe. The throttling device 6 is connected to a valve 13 via a pipe. The valve 13 is connected to a compressor 14 via a pipe. The compressor 14 is connected to a heating heat exchanger 16 via a pipe. The heating heat exchanger 16 is connected to an expansion valve 19 via a pipe. The expansion valve 19 is connected to the indoor... An external heat exchanger 1 is connected, and the heating heat exchanger 16 is also connected to the heating pipe 17; the medium-pressure tank 3 is used to separate the refrigerant liquid and gas, and the heating pipe 17 is used to heat the air source heat pump system to ensure the normal operation of the device at a temperature of -40 degrees Celsius; the outdoor heat exchanger 1 is used to exchange heat with the outdoor air; the valve 1 2 and the valve 3 13 are used to control the flow of refrigerant in the pipeline; the one-way valve 2 5 is used to prevent refrigerant backflow; the throttling device 1 6 is used to promote the flow rate of refrigerant in the pipeline; the compressor 3 14 is used to compress the refrigerant, so that the refrigerant has the characteristics of high temperature and high pressure; the expansion valve 19 is used to reduce the temperature of the refrigerant.
[0014] In this embodiment, the air outlet on the medium-pressure tank 3 is connected to the compressor 8 via a pipe, the compressor 8 is connected to the throttling device 12 via a pipe, the throttling device 12 is connected to the indoor heat exchanger 15 via a pipe, and the indoor heat exchanger 15 is connected to the expansion valve 19 via a pipe.
[0015] In this embodiment, a branch pipe is also provided on the pipe between the outdoor heat exchanger 1 and valve 2. The branch pipe is connected to the pipe between the gas-liquid separator 9 and the one-way valve 5. The branch pipe is provided with one-way valve 4 and throttling device 7. The one-way valve 4 and throttling device 7 on the branch pipe can allow the refrigerant to pass through the intermediate pressure tank 3 and enter the gas-liquid separator.
[0016] In this embodiment, the gas-liquid separator 9 is also connected to a valve 2 10 via a pipe. The valve 2 10 is connected to a compressor 2 11 via a pipe. The compressor 2 11 is connected to an indoor heat exchanger 2 18 via a pipe. The indoor heat exchanger 2 18 is connected to an expansion valve 19 via a pipe. The indoor heat exchanger 2 18 is used for heat exchange with the indoor environment.
[0017] In this embodiment, under normal circumstances, check valve 4 and valve 10 can be opened, while valve 2, valve 13 and check valve 5 can be closed. This allows the refrigerant to exchange heat from the outdoor heat exchanger 1, and then enter the gas-liquid separator 9 through the branch pipe via check valve 4 and throttling device 7 for gas-liquid separation. After gas-liquid separation, the refrigerant enters the compressor 11 through valve 10 for compression, resulting in higher temperature and pressure. Subsequently, the refrigerant exchanges heat with the indoor unit through the indoor heat exchanger 18, raising the indoor water temperature. The cooled refrigerant then enters the expansion valve 19 to further reduce its temperature. After condensing into a liquid, the refrigerant re-enters the outdoor heat exchanger 1 for heat exchange, forming a cycle.
[0018] In this embodiment, when the temperature is low, valve 12, check valve 25, and valve 313 are opened, and valve 210 and check valve 14 are closed. The refrigerant exchanges heat from the outdoor heat exchanger 1 and then enters the medium-pressure tank 3 through valve 12. The gaseous refrigerant enters the compressor 8 from the outlet for compression and heating. The compressed refrigerant is accelerated by the throttling device 312 and enters the indoor heat exchanger 15 for heat exchange. After heat exchange, the indoor water temperature increases and the refrigerant temperature decreases. The refrigerant with the decreased temperature enters the expansion valve 19 and condenses into water, which then enters the outdoor heat exchanger 1. The liquid refrigerant in the medium-pressure tank 3 is accelerated into the gas-liquid separator 9 through the one-way valve 2 5 and the throttling device 1 6 for gas-liquid separation. Then, the refrigerant enters the compressor 3 14 through the valve 3 13 for compression and heating. The heated refrigerant enters the heating heat exchanger 16 to exchange heat with the water in the heating pipe 17, which raises the water temperature in the heating pipe 17. The heating pipe 17 is used to maintain the temperature of the entire air source heat pump system. The refrigerant after heat exchange in the heating heat exchanger 16 enters the expansion valve 19 for cooling and liquefaction. After liquefaction, the refrigerant enters the outdoor heat exchanger 1 for heat exchange.
[0019] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.
[0020] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A -40°C air source heat pump system, characterized in that, The system includes an outdoor heat exchanger (1), which is connected to a medium-pressure tank (3) via a pipe. A valve (2) is installed on the pipe. The medium-pressure tank (3) is provided with a liquid outlet and a gas outlet. The liquid outlet is connected to a one-way valve (5) via a pipe. The one-way valve (5) is connected to a throttling device (6) via a pipe. The throttling device (6) is connected to a valve (13) via a pipe. The valve (13) is connected to a compressor (14) via a pipe. The compressor (14) is connected to a heating heat exchanger (16) via a pipe. The heating heat exchanger (16) is connected to an expansion valve (19) via a pipe. The expansion valve (19) is connected to the outdoor heat exchanger (1) via a pipe. The heating heat exchanger (16) is also connected to a heating pipe (17). The liquid refrigerant in the medium-pressure tank (3) is accelerated into the gas-liquid separator (9) by the one-way valve (5) and the throttling device (6) for gas-liquid separation. Then the refrigerant enters the compressor (14) through the valve (13) for compression and heating. The outlet of the medium-pressure tank (3) is connected to the compressor (8) through a pipe. The compressor (8) is connected to the throttling device (12) through a pipe. The throttling device (12) is connected to the indoor heat exchanger (15) through a pipe. The indoor heat exchanger (15) is connected to the expansion valve (19) through a pipe.
2. The -40°C air source heat pump system according to claim 1, characterized in that: A branch pipe is also provided on the pipe between the outdoor heat exchanger (1) and valve one (2). The branch pipe is connected to the pipe between the gas-liquid separator (9) and the one-way valve two (5). The branch pipe is provided with one-way valve one (4) and throttling device two (7).
3. The -40°C air source heat pump system according to claim 1, characterized in that: The gas-liquid separator (9) is also connected to valve two (10) via a pipe. Valve two (10) is connected to compressor two (11) via a pipe. Compressor two (11) is connected to indoor heat exchanger two (18) via a pipe. Indoor heat exchanger two (18) is connected to expansion valve (19) via a pipe.