Air-supplementing enthalpy-increasing refrigerating system

Abstract

An exhaust port of a compressor, a port D of a four-way valve, a port C of the four-way valve, a condenser, an economizer, a main path expansion valve, an evaporator, a port E of the four-way valve, a port S of the four-way valve and an air suction port of the compressor of the air supply and enthalpy increase refrigerating system are sequentially connected through a main path pipeline to form a main path loop; the air-supplementing enthalpy-increasing refrigerating system further comprises a liquid storage device, a liquid inlet pipe, a main path liquid outlet pipe and an auxiliary path liquid outlet pipe. The liquid inlet pipe, the main path liquid outlet pipe and the auxiliary path liquid outlet pipe are all communicated with an inner cavity of the liquid storage device. The liquid inlet pipe and the main path liquid outlet pipe are connected in series in a main path loop, a liquid outlet of the auxiliary path liquid outlet pipe, the economizer and an air supply port of the compressor are sequentially communicated through an auxiliary path pipeline, and an auxiliary path expansion valve is further arranged on the auxiliary path pipeline. The air-supplementing enthalpy-increasing refrigerating system can ensure the working stability and reliability.

Description

Technical Field

[0001] The utility model belongs to the technical field of air conditioning, and in particular relates to an air-supplementing enthalpy-increasing refrigeration system. Background Art

[0002] At present, the air-injection enthalpy-increasing refrigeration system is mainly used in ultra-low temperature air source heat pumps, and is suitable for high-cold and high-humidity areas in the north. The air-injection enthalpy-increasing refrigeration system effectively solves the technical problem that the heating capacity of ordinary air source heat pumps decreases in cold winters, and even it is difficult to operate normally.

[0003] During the test operation, the air-injection enthalpy-increasing refrigeration system in the prior art was found to have technical problems such as imbalance in the refrigerant distribution between the main and auxiliary circuits of the economizer, excessive refrigerant distribution in the auxiliary circuit and control failure, too little refrigerant in the main circuit of the economizer, too little heat absorbed by the evaporator from the air, and serious attenuation of the heating capacity of the air source heat pump, making it impossible to ensure stable and reliable operation under low ambient temperature conditions.

[0004] In the prior art, the pipeline of the air-injection and enthalpy-increasing refrigeration system is designed to lead out the economizer auxiliary pipeline from the main pipeline of the refrigerant liquid. The main refrigerant flow of the economizer = the refrigerant flow of the liquid pipeline - the refrigerant flow of the economizer auxiliary pipeline. The main refrigerant flow of the economizer is less than the refrigerant flow of the liquid pipeline. Under extreme working conditions, the refrigerant in the main pipeline of the economizer has insufficient liquid supply.

[0005] At the same time, the economizer auxiliary pipeline draws liquid from the refrigerant liquid pipeline, which also has technical difficulties such as drilling holes and welding in the refrigerant liquid pipeline, complex pipelines and narrow working space. Summary of the invention

[0006] The technical problem to be solved by the utility model is to provide an air-supplementing enthalpy-increasing refrigeration system, which can ensure the working stability and reliability of the refrigeration system.

[0007] In order to solve the above technical problems, the technical solution of the utility model is:

[0008] A gas-injection and enthalpy-increasing refrigeration system comprises a compressor, a four-way valve, a condenser, an economizer, a main expansion valve, and an evaporator; the exhaust port of the compressor, the port D of the four-way valve, the port C of the four-way valve, the condenser, the economizer, the main expansion valve, the evaporator, the port E of the four-way valve, the port S of the four-way valve, and the air intake port of the compressor are sequentially connected through a main pipeline to form a main loop; the gas-injection and enthalpy-increasing refrigeration system also comprises a liquid reservoir, a liquid inlet pipe, a main liquid outlet pipe, and an auxiliary liquid outlet pipe, the liquid inlet pipe, the main liquid outlet pipe, and the auxiliary liquid outlet pipe are all connected to the inner cavity of the liquid reservoir; the liquid inlet pipe and the main liquid outlet pipe are connected in series in the main loop, the liquid outlet of the auxiliary liquid outlet pipe, the economizer, and the gas-injection port of the compressor are sequentially connected through an auxiliary pipeline, and an auxiliary expansion valve is also arranged on the auxiliary pipeline.

[0009] Furthermore, the liquid storage tank is arranged between the condenser and the economizer.

[0010] Furthermore, the liquid storage tank is arranged between the economizer and the evaporator.

[0011] Furthermore, the auxiliary circuit expansion valve is arranged between the auxiliary circuit liquid outlet pipe and the economizer.

[0012] Furthermore, the main expansion valve is arranged between the economizer and the evaporator.

[0013] Furthermore, the main expansion valve is arranged between the main liquid outlet pipe and the evaporator.

[0014] Furthermore, the diameter of the main liquid outlet pipe is greater than the diameter of the auxiliary liquid outlet pipe.

[0015] Furthermore, the diameter of the liquid inlet pipe is greater than the diameter of the main liquid outlet pipe.

[0016] Furthermore, the evaporator is a fin-type evaporator.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] The exhaust port of the compressor of the air-injection and re-enthalpy-increasing refrigeration system, the port D of the four-way valve, the port C of the four-way valve, the condenser, the economizer, the main expansion valve, the evaporator, the port E of the four-way valve, the port S of the four-way valve, and the air intake of the compressor are sequentially connected through the main pipeline to form a main loop; the air-injection and re-enthalpy-increasing refrigeration system also includes a liquid storage device, a liquid inlet pipe, a main liquid outlet pipe, and an auxiliary liquid outlet pipe, and the liquid inlet pipe, the main liquid outlet pipe, and the auxiliary liquid outlet pipe are all connected to the inner cavity of the liquid storage device; the liquid inlet pipe and the main liquid outlet pipe are connected in series in the main loop, and the liquid outlet of the auxiliary liquid outlet pipe, the economizer, and the air-injection port of the compressor are sequentially connected through the auxiliary pipeline, and an auxiliary expansion valve is also arranged on the auxiliary pipeline.

[0019] Firstly, the main circuit and auxiliary circuit of the economizer are completely separated by using a liquid storage device. The auxiliary circuit of the economizer no longer occupies the refrigerant flow in the main circuit of the economizer, thus effectively avoiding the flow imbalance between the main circuit and the auxiliary circuit and solving the problem of liquid grabbing in the auxiliary circuit.

[0020] Secondly, the economizer auxiliary circuit takes liquid directly from the liquid reservoir, and no longer needs to drill holes in the liquid pipe of the refrigerant main circuit to take liquid. This simplifies the process, optimizes the pipeline, reduces welding points, makes assembly more convenient, makes the system more reliable and stable, and reduces failure points.

[0021] In summary, the air-injection enthalpy-increasing refrigeration system of the present invention can ensure working stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the first embodiment of the air-supplementing enthalpy-increasing refrigeration system of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the second embodiment of the air-supplementing enthalpy-increasing refrigeration system of the utility model;

[0024] Figure 3 yes Figure 1 A partial enlarged view of the middle A area;

[0025] In the figure, the direction of the arrow indicates the flow direction of the fluid;

[0026] In the figure, 1. evaporator; 2. compressor; 3. four-way valve; 4. condenser; 5. liquid storage tank; 6. auxiliary expansion valve; 7. economizer; 8. main expansion valve; 9. liquid inlet pipe; 10. main liquid outlet pipe; 11. auxiliary liquid outlet pipe. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Embodiment 1:

[0029] Combination Figure 1 as well as Figure 3As shown together, an air-compensating enthalpy-increasing refrigeration system comprises a compressor 2, a four-way valve 3, a condenser 4, an economizer 7, a main expansion valve 8, and an evaporator 1. The evaporator 1 is preferably a finned evaporator.

[0030] The exhaust port X of the compressor 2, the port D of the four-way valve 3, the port C of the four-way valve 3, the condenser 4, the economizer 7, the main expansion valve 8, the evaporator 1, the port E of the four-way valve 3, the port S of the four-way valve 3, and the suction port Y of the compressor 2 are connected in sequence through the main pipeline to form a main circuit.

[0031] The air-injection enthalpy-increasing refrigeration system also includes a liquid reservoir 5, a liquid inlet pipe 9, a main liquid outlet pipe 10, and an auxiliary liquid outlet pipe 11. The bottoms of the liquid inlet pipe 9, the main liquid outlet pipe 10, and the auxiliary liquid outlet pipe 11 are all connected to the inner cavity of the liquid reservoir 5.

[0032] Preferably, the liquid inlet pipe 9 and the main liquid outlet pipe 10 are connected in series in the main circuit.

[0033] Preferably, the liquid reservoir 5 is disposed between the condenser 4 and the economizer 7 .

[0034] Further preferably, the main expansion valve 8 is arranged between the economizer 7 and the evaporator 1 .

[0035] The fluid flow direction in the main circuit is as follows:

[0036] Exhaust port X of compressor 2 → port D of four-way valve 3 → port C of four-way valve 3 → inlet of condenser 4 → outlet of condenser 4 → inlet of the upper end of liquid inlet pipe 9 → outlet of the lower end of liquid inlet pipe 9 → inlet of the lower end of main liquid outlet pipe 10 → outlet of the upper end of main liquid outlet pipe 10 → main inlet A of economizer 7 → main outlet B of economizer 7 → main expansion valve 8 → inlet of evaporator 1 → outlet of evaporator 1 → port E of four-way valve 3 → port S of four-way valve 3 → suction port Y of compressor 2.

[0037] The liquid outlet at the upper end of the auxiliary liquid outlet pipe 11, the auxiliary inlet M of the economizer 7, the auxiliary outlet N of the economizer 7, and the air supply port Z of the compressor 2 are sequentially connected through the auxiliary pipeline.

[0038] An auxiliary expansion valve 6 is also provided on the auxiliary pipeline, and the auxiliary expansion valve 6 is arranged between the auxiliary liquid outlet pipe 11 and the economizer 7 .

[0039] The flow direction of fluid in the auxiliary circuit is as follows:

[0040] The liquid outlet at the upper end of the auxiliary liquid outlet pipe 11 → the auxiliary expansion valve 6 → the auxiliary inlet M of the economizer 7 → the auxiliary outlet N of the economizer 7 → the air supply port Z of the compressor 2 .

[0041] Further preferably, the diameter of the main liquid outlet pipe 10 is greater than the diameter of the auxiliary liquid outlet pipe 11 .

[0042] Further preferably, the diameter of the liquid inlet pipe 9 is greater than the diameter of the main liquid outlet pipe 10 .

[0043] Embodiment 2:

[0044] Combination Figure 2 As shown, the liquid storage tank 5 is arranged between the economizer 7 and the evaporator 1 .

[0045] Preferably, the main expansion valve 8 is arranged between the main liquid outlet pipe 10 and the evaporator 1 .

[0046] The fluid flow direction in the main circuit is as follows:

[0047] Exhaust port X of compressor 2 → port D of four-way valve 3 → port C of four-way valve 3 → inlet of condenser 4 → outlet of condenser 4 → main inlet A of economizer 7 → main outlet B of economizer 7 → inlet of the upper end of liquid inlet pipe 9 → outlet of the lower end of liquid inlet pipe 9 → inlet of the lower end of main liquid outlet pipe 10 → outlet of the upper end of main liquid outlet pipe 10 → main expansion valve 8 → inlet of evaporator 1 → outlet of evaporator 1 → port E of four-way valve 3 → port S of four-way valve 3 → suction port Y of compressor 2.

[0048] The remaining structures are the same as those in the first embodiment and will not be described again.

[0049] In the description of this specification, it is necessary to understand that the orientation or positional relationship described by "upper end" and "lower end" etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] Although the specific implementation methods of the utility model are described above, those skilled in the art should understand that the described embodiments are only part of the implementation methods of the utility model, rather than all the implementation methods, which are only examples, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementation methods without departing from the principle and essence of the utility model and without any creative work, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. An air-injection enthalpy-increasing refrigeration system, comprising a compressor, a four-way valve, a condenser, an economizer, a main expansion valve, and an evaporator; The exhaust port of the compressor, the port D of the four-way valve, the port C of the four-way valve, the condenser, the economizer, the main expansion valve, the evaporator, the port E of the four-way valve, the port S of the four-way valve, and the suction port of the compressor are sequentially connected through a main pipeline to form a main circuit; characterized in that, The air-inflating and enthalpy-increasing refrigeration system also includes a liquid reservoir, a liquid inlet pipe, a main liquid outlet pipe, and an auxiliary liquid outlet pipe. The liquid inlet pipe, the main liquid outlet pipe, and the auxiliary liquid outlet pipe are all connected to the inner cavity of the liquid reservoir; the liquid inlet pipe and the main liquid outlet pipe are connected in series in the main circuit, and the liquid outlet of the auxiliary liquid outlet pipe, the economizer, and the air-inflating port of the compressor are sequentially connected through an auxiliary pipeline, and an auxiliary expansion valve is also arranged on the auxiliary pipeline.

2. The air-supplementing enthalpy-increasing refrigeration system according to claim 1, characterized in that: The liquid reservoir is disposed between the condenser and the economizer.

3. The air-supplementing enthalpy-increasing refrigeration system according to claim 1, characterized in that: The liquid reservoir is disposed between the economizer and the evaporator.

4. The air-supplementing enthalpy-increasing refrigeration system according to claim 1, characterized in that: The auxiliary circuit expansion valve is arranged between the auxiliary circuit liquid outlet pipe and the economizer.

5. The air-supplementing enthalpy-increasing refrigeration system according to claim 2, characterized in that: The main expansion valve is arranged between the economizer and the evaporator.

6. The air-supplementing enthalpy-increasing refrigeration system according to claim 3, characterized in that: The main expansion valve is arranged between the main liquid outlet pipe and the evaporator.

7. The air-supplementing enthalpy-increasing refrigeration system according to claim 1, characterized in that: The diameter of the main liquid outlet pipe is greater than the diameter of the auxiliary liquid outlet pipe.

8. The air-supplementing enthalpy-increasing refrigeration system according to claim 7, characterized in that: The diameter of the liquid inlet pipe is greater than the diameter of the main liquid outlet pipe.

9. The air-supplementing enthalpy-increasing refrigeration system according to claim 1, characterized in that: The evaporator is a fin-type evaporator.

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