A refrigeration system with an oil forced lubrication function

Abstract

The present invention discloses a refrigeration system with an oil forced lubrication function, comprising: a condenser, an evaporator, an expansion valve and a compressor. The compressor, the condenser, the expansion valve, the evaporator and the compressor are connected in sequence to form a main circuit for completing the refrigeration or heating process. A refrigerant pump is introduced at the liquid storage of the condenser, and an oil separator is also installed at the outlet of the compressor. The oil separator is used to separate the refrigerant and the lubricating oil; the refrigerant pump mixes the liquid or gaseous refrigerant condensed by the condenser and the lubricating oil separated from the oil separator and then injects it into the compression chamber of the compressor. In the present invention, a refrigerant pump is introduced at the liquid storage of the condenser. This pump forcibly injects the liquid or gaseous refrigerant condensed by the condenser and the lubricating oil separated from the oil separator into the high-pressure compression chamber of the compressor after mixing them in a certain proportion, which can effectively improve the refrigeration effect of the entire refrigeration system and enhance its refrigeration performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigeration, and particularly relates to a refrigeration system with an oil forced lubrication function. Background Art

[0002] In traditional refrigerant spraying or vapor injection systems, only the pressure difference between the condenser and the compression chamber of the compressor is used to spray the refrigerant into the compression chamber, and it cannot be sprayed into the exhaust chamber. Moreover, the amount of sprayed refrigerant is limited by the pressure difference between the condenser and the compression chamber and the diameter of the passage, resulting in a general spraying effect. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention proposes a refrigeration system with an oil forced lubrication function.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A refrigeration system with an oil forced lubrication function, comprising: a condenser, an evaporator, an expansion valve, and a compressor. The compressor, the condenser, the expansion valve, the evaporator, and the compressor are connected in sequence to form a main circuit for completing the refrigeration or heating process. It is characterized in that a refrigerant pump is introduced at the liquid storage of the condenser, and an oil separator is further installed at the outlet of the compressor. The oil separator is used to separate the refrigerant and lubricating oil;

[0006] The refrigerant pump mixes the liquid or gaseous refrigerant condensed by the condenser and the lubricating oil separated from the oil separator and then injects it into the compression chamber of the compressor.

[0007] The present invention discloses a refrigeration system with an oil forced lubrication function. A refrigerant pump is introduced at the liquid storage of the condenser. This pump mixes the liquid or gaseous refrigerant condensed by the condenser and the lubricating oil separated from the oil separator in a certain proportion and then forcibly injects it into the high-pressure compression chamber of the compressor, which can effectively improve the refrigeration effect of the entire refrigeration system and enhance its refrigeration performance. The refrigerant pump has the function of spraying lubricating oil, which significantly improves the lubrication and sealing of the main engine of the refrigeration compressor.

[0008] Based on the above technical solution, the following improvements can be made:

[0009] As a preferred solution, the refrigerant pump is connected to a subcooler. The refrigerant pump mixes the liquid or gaseous refrigerant passing through the subcooler and the lubricating oil separated from the oil separator and then injects it into the compression chamber of the compressor.

[0010] By adopting the above preferred solution, the subcooler can cool down the liquid or gaseous refrigerant and the lubricating oil injected into the compressor.

[0011] As a preferred solution, a refrigerant pipe is provided on the compressor. One end of the refrigerant pipe communicates with the compression chamber of the compressor, and the opposite end thereof is connected to a refrigerant pump. The refrigerant pump mixes gaseous or liquid refrigerant and the lubricating oil separated from the oil separator and then injects the mixture into the compression chamber of the compressor.

[0012] By adopting the above preferred solution, the refrigerant can be quickly and effectively injected into the compression chamber of the compressor.

[0013] As a preferred solution, a pressure gauge and a pressure sensor are provided on the refrigerant pipe. The pressure sensor is connected to the refrigerant pump, and the refrigerant pump adjusts its output pressure and flow rate according to the pressure value collected by the pressure sensor and the exhaust pressure of the compressor.

[0014] By adopting the above preferred solution, the pressure value of the refrigerant pipe is controllable.

[0015] As a preferred solution, the refrigerant pump can mix gaseous or liquid refrigerant and the lubricating oil separated from the oil separator and then inject the mixture into the exhaust chamber of the compressor. The exhaust chamber of the compressor is a partial chamber that can communicate with the exhaust passage of the compressor and is close to the compression mechanism of the compressor.

[0016] By adopting the above preferred solution, the exhaust temperature is further reduced.

[0017] As a preferred solution, the injection amount and injection pressure of the refrigerant injected into the compression chamber and / or the exhaust chamber can be adjusted by the refrigerant pump.

[0018] By adopting the above preferred solution, it is adjusted by the refrigerant pump.

[0019] As a preferred solution, the refrigerant pump is one or more of a variable-speed pump, a constant-speed pump, a metering pump, and a variable-displacement pump.

[0020] By adopting the above preferred solution, it is selected according to specific requirements.

[0021] As a preferred solution, the compressor can be a scroll compressor, a rotary compressor, or a screw compressor.

[0022] By adopting the above preferred solution, the application range of this refrigeration system is wide.

[0023] As a preferred solution, when the compressor is a scroll compressor, the scroll compressor includes: a housing, a moving scroll disk, a stationary scroll disk, and a driving assembly. A compression chamber is formed between the moving scroll disk and the stationary scroll disk. The moving scroll disk, the stationary scroll disk, and the driving assembly are arranged in the housing. A refrigerant passage is provided on the stationary scroll disk. One end of the refrigerant passage communicates with the refrigerant pipe, and the other end thereof communicates with the inlet of the compression chamber. The refrigerant pipe is connected to the refrigerant pump.

[0024] With the above preferred solution, when the compressor is a scroll compressor, the structure is simple, and the refrigerant and lubricating oil can be smoothly injected into the compression chamber of the compressor.

[0025] As a preferred solution, when the compressor is a scroll compressor, the scroll compressor includes: a housing, a moving scroll disk, a stationary scroll disk, and a driving assembly. A compression chamber is formed between the moving scroll disk and the stationary scroll disk. The moving scroll disk, the stationary scroll disk, and the driving assembly are arranged inside the housing. A refrigerant passage is provided on the stationary scroll disk. One end of the refrigerant passage is connected to the refrigerant pipe, and the other end is respectively connected to the compression chamber inlet and the compressor exhaust port. The refrigerant pipe is connected to the refrigerant pump.

[0026] With the above preferred solution, when the compressor is a scroll compressor, the structure is simple, and the refrigerant and lubricating oil can be smoothly injected into the exhaust chamber of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 One of the structural block diagrams of the refrigeration system with oil forced lubrication function provided by the embodiment of the present invention.

[0029] Figure 2 Another structural block diagram of the refrigeration system with oil forced lubrication function provided by the embodiment of the present invention.

[0030] Figure 3 Another structural block diagram of the refrigeration system with oil forced lubrication function provided by the embodiment of the present invention.

[0031] Figure 4 One of the structural schematic diagrams of the compressor provided by the embodiment of the present invention.

[0032] Figure 5 Another structural schematic diagram of the compressor provided by the embodiment of the present invention.

[0033] Figure 6 The structural schematic diagram of the connection assembly provided by the embodiment of the present invention.

[0034] Figure 7 The left view of the connection assembly provided by the embodiment of the present invention.

[0035] Figure 8 The right view of the connection assembly provided by the embodiment of the present invention.

[0036] Figure 9 Schematic diagram of the connection structure between the connection component and the refrigerant channel provided by the embodiment of the present invention.

[0037] Wherein: 1 - compressor, 11 - housing, 12 - moving scroll plate, 13 - stationary scroll plate, 14 - drive assembly, 15 - refrigerant channel, 2 - condenser, 3 - expansion valve, 4 - evaporator, 5 - refrigerant liquid storage tank, 6 - refrigerant pipe, 7 - refrigerant pump, 8 - subcooler, 9 - pressure gauge, 10 - connection component, 101 - first connection pipe, 102 - second connection pipe, 103 - internal thread, 104 - reinforcement component, 111 - oil separator, 112 - oil circuit, 113 - oil quantity control valve, 114 - refrigerant control valve. Specific embodiments

[0038] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] The expression of "including" an element is an "open-ended" expression, which only means that there is a corresponding component and should not be construed as excluding additional components.

[0041] In some embodiments of a refrigeration system with an oil forced lubrication function to achieve the purpose of the present invention, the refrigeration system includes: a condenser 2, an evaporator 4, an expansion valve 3, and a compressor 1. The compressor 1, the condenser 2, the expansion valve 3, the evaporator 4, and the compressor 1 are connected in sequence to form a main circuit for completing the refrigeration or heating process. A refrigerant pump is introduced at the liquid storage part of the condenser 2, and an oil separator 111 is also installed at the outlet of the compressor 1. The oil separator 111 is used to separate the refrigerant and the lubricating oil, and the oil separator 111 is connected to the refrigerant pump 7 through an oil circuit 112.

[0042] The refrigerant pump 7 mixes the liquid or gaseous refrigerant condensed by the condenser 2 and the lubricating oil separated from the oil separator 111 and then pumps them into the compression chamber of the compressor 1.

[0043] The compression chamber of the compressor 1 refers to a non - suction chamber, and a closed cavity that is isolated from the suction chamber and the exhaust chamber and tends to lead to the exhaust high - pressure chamber.

[0044] The refrigerant is stored in the refrigerant liquid storage tank 5.

[0045] The present invention discloses a refrigeration system with an oil forced lubrication function. A refrigerant pump is introduced at the liquid storage of the condenser 2. This pump forcibly injects the liquid or gaseous refrigerant that has been condensed by the condenser 2 and the lubricating oil separated from the oil separator into the high-pressure compression chamber of the compressor after mixing them in a certain proportion, which can effectively improve the refrigeration effect of the entire refrigeration system, enhance its refrigeration performance, and at the same time improve the lubrication effect and prevent wear, resulting in unexpected beneficial effects.

[0046] The refrigerant pump has the function of injecting lubricating oil, which significantly improves the lubrication and sealing of the main engine of the refrigeration compressor.

[0047] In order to further optimize the implementation effect of the present invention, in some other embodiments, the remaining characteristic technologies are the same, and the difference lies in that the refrigerant pump 7 is connected to the subcooler 8. The refrigerant pump 7 mixes the liquid or gaseous refrigerant that has passed through the subcooler 8 and the lubricating oil separated from the oil separator 111 and then injects it into the compression chamber of the compressor 1.

[0048] Adopting the above preferred solution, the subcooler 8 can cool down the liquid or gaseous refrigerant and lubricating oil injected into the compressor. The cold source input of the subcooler 8 can be the cold end loop of the system of this application or from an external independent system.

[0049] As Figure 2 shown, in order to further optimize the implementation effect of the present invention, in some other embodiments, the remaining characteristic technologies are the same, and the difference lies in that a refrigerant pipe 6 is provided on the compressor 1. One end of the refrigerant pipe 6 is communicated with the compression chamber of the compressor 1, and the opposite end is connected to the refrigerant pump 7. The refrigerant pump 7 mixes the gaseous or liquid refrigerant and the lubricating oil separated from the oil separator 111 and then injects it into the compression chamber of the compressor 1.

[0050] Adopting the above preferred solution, the refrigerant can be quickly and effectively injected into the compression chamber of the compressor 1.

[0051] In order to further optimize the implementation effect of the present invention, in some other embodiments, the remaining characteristic technologies are the same, and the difference lies in that a pressure gauge 9 and a pressure sensor are provided on the refrigerant pipe 6. The pressure sensor is electrically connected to the refrigerant pump, and the refrigerant pump adjusts its output pressure and flow rate according to the pressure value collected by the pressure sensor.

[0052] Adopting the above preferred solution, the pressure value of the refrigerant pipe 6 can be controlled.

[0053] In order to further optimize the implementation effect of the present invention, in some other embodiments, the remaining characteristic technologies are the same, and the difference lies in that the refrigerant pump 7 can mix the gaseous or liquid refrigerant and the lubricating oil separated from the oil separator 111 and then inject it into the compressor exhaust cavity. The compressor exhaust cavity is a partial cavity that can communicate with the compressor exhaust passage and is close to the compressor compression mechanism.

[0054] With the above preferred solution, the exhaust temperature is further reduced. It should be noted that in the present invention, the area referred to as the compressor exhaust cavity is the area communicating with the exhaust port.

[0055] Furthermore, on the basis of the above embodiment, the injection amount and injection pressure of the refrigerant injected into the compression cavity and / or the exhaust cavity can be adjusted by the refrigerant pump 7.

[0056] With the above preferred solution, the injection amount and injection pressure can be controlled by the refrigerant pump 7.

[0057] In order to further optimize the implementation effect of the present invention, in some other embodiments, the remaining characteristic technologies are the same, and the difference lies in that the refrigerant pump 7 is one or more of a variable-speed pump, a constant-speed pump, a metering pump, and a variable-displacement pump.

[0058] With the above preferred solution, it is selected according to specific requirements.

[0059] In order to further optimize the implementation effect of the present invention, in some other embodiments, the remaining characteristic technologies are the same, and the difference lies in that an oil flow control valve 113 is additionally provided on the oil circuit 112, and the oil flow control valve 113 is used to control the transmission oil volume of the lubricating oil on the oil circuit 112.

[0060] With the above preferred solution, the return oil volume of the lubricating oil on the oil circuit 112 can be effectively controlled in real time.

[0061] Furthermore, a refrigerant control valve 114 is additionally provided on the refrigerant transmission pipeline, and the refrigerant control valve 114 is used to control the transmission volume of the refrigerant on the refrigerant transmission pipeline.

[0062] With the above preferred solution, the refrigerant volume on the refrigerant transmission pipeline can be effectively controlled in real time.

[0063] With the above preferred solution, the oil volume of the lubricating oil on the oil circuit 112 can be effectively controlled in real time.

[0064] The above-mentioned multiple embodiments can be realized in a cross-parallel manner.

[0065] The above-mentioned compressor 1 can be, but is not limited to, a scroll compressor, a rotary compressor, or a screw compressor. Of course, it can also be other types of compressors, and the present invention does not make any limitations.

[0066] Hereinafter, a scroll compressor will be taken as an example for description.

[0067] Such as Figure 4As shown, in some embodiments, when the compressor 1 is a scroll compressor, the compressor includes: a housing 11, a moving scroll 12, a stationary scroll 13, and a drive assembly 14. A compression chamber is formed between the moving scroll 12 and the stationary scroll 13. The moving scroll 12, the stationary scroll 13, and the drive assembly 14 are disposed within the housing 11. A refrigerant passage 15 is provided on the stationary scroll 13. One end of the refrigerant passage 15 is connected to the refrigerant pipe 6, and the other end is connected to the compression chamber inlet. The refrigerant pipe 6 is connected to the refrigerant pump 7.

[0068] When the compressor is a scroll compressor, the structure is simple, and the refrigerant and lubricating oil can be smoothly pumped into the compression chamber of the compressor.

[0069] As Figure 5 shown, in some other embodiments, when the compressor 1 is a scroll compressor, the compressor includes: a housing 11, a moving scroll 12, a stationary scroll 13, and a drive assembly 14. A compression chamber is formed between the moving scroll 12 and the stationary scroll 13. The moving scroll 12, the stationary scroll 13, and the drive assembly 14 are disposed within the housing 11. A refrigerant passage 15 is provided on the stationary scroll 13. One end of the refrigerant passage 15 is connected to the refrigerant pipe 6, and the other end is respectively connected to the compression chamber inlet and the compressor discharge port. The refrigerant pipe 6 is connected to the refrigerant pump 7.

[0070] When the compressor is a scroll compressor, the structure is simple, and the refrigerant and lubricating oil can be smoothly pumped into the discharge chamber of the compressor, and the refrigeration effect is better.

[0071] As Figures 6 - 9 described, further, the refrigerant pipe 6 is connected to the refrigerant passage 15 through a connection assembly 10. The connection assembly 10 includes:

[0072] A first connecting pipe 101. One end of the first connecting pipe 101 is connected to the refrigerant pipe 6 through its internal thread 103, and the opposite end is connected to a second connecting pipe 102. The inner cavity structure of the first connecting pipe is along the refrigerant transmission direction, and the cross-section of its inner cavity transitions from a circular shape to a flat rectangular shape;

[0073] A second connecting pipe 102 for connecting the first connecting pipe 101 and the refrigerant passage 15.

[0074] Using the above connection assembly 10 can transport the refrigerant to the corresponding compression chamber and / or discharge chamber more smoothly and quickly.

[0075] Further, the inner wall of the second connecting pipe 102 is smooth and rounded, and the diameter of its outlet is larger than that of its inlet to ensure the smooth transmission of the refrigerant.

[0076] Further, the first connecting pipe 101 and the second connecting pipe 102 are connected through a strengthening assembly 104 to ensure the connection strength between the two.

[0077] The above embodiments are only used to illustrate the technical concept and features of the present invention. The purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A refrigeration system with an oil forced lubrication function, comprising: A condenser, an evaporator, an expansion valve, and a compressor, wherein the compressor, the condenser, the expansion valve, the evaporator, and the compressor are connected in sequence to form a main circuit for completing the refrigeration or heating process. It is characterized in that a refrigerant pump is introduced at the liquid storage part of the condenser, and an oil separator is also installed at the outlet of the compressor. The oil separator is used to separate the refrigerant and the lubricating oil; The outlet of the oil separator is communicated with the inlet of the refrigerant pump. The outlet of the condenser is connected with a refrigerant liquid storage tank. The refrigerant liquid storage tank is communicated with the evaporator through a first pipeline. The refrigerant liquid storage tank is sequentially connected with a subcooler and the refrigerant pump through a second pipeline. The first pipeline and the second pipeline are arranged in parallel; The refrigerant pump can mix the gaseous or liquid refrigerant and the lubricating oil separated from the oil separator and then pump them into the compressor exhaust cavity.

2. The refrigeration system with forced oil lubrication function according to claim 1, characterized in that, A refrigerant pipe is provided on the compressor. One end of the refrigerant pipe is communicated with the compression cavity of the compressor, and the opposite end is connected with the refrigerant pump.

3. The refrigeration system with an oil forced lubrication function according to claim 2, characterized in that, A pressure gauge and a pressure sensor are provided on the refrigerant pipe. The pressure sensor is connected with the refrigerant pump. The refrigerant pump adjusts its output pressure and flow rate according to the pressure value collected by the pressure sensor and the exhaust pressure of the compressor.

4. The refrigeration system with an oil forced lubrication function according to claim 2, characterized in that, The compressor exhaust cavity is a part of the cavity that can communicate with the compressor exhaust passage and is close to the compressor compression mechanism.

5. The refrigeration system with forced oil lubrication function according to claim 4, characterized in that, The injection amount and injection pressure of the refrigerant injected into the compression cavity and / or the exhaust cavity can be adjusted by the refrigerant pump.

6. The refrigeration system with forced oil lubrication function according to claim 1, characterized in that, The refrigerant pump is one or more of a variable-speed pump, a constant-speed pump, a metering pump, and a variable-displacement pump.

7. The refrigeration system with an oil forced lubrication function according to any one of claims 1-6, characterized in that, The compressor can be a scroll compressor, a rotary compressor, or a screw compressor.

8. The refrigeration system with an oil forced lubrication function according to claim 7, characterized in that, When the compressor is a scroll compressor, the scroll compressor includes: a housing, a moving scroll plate, a stationary scroll plate, and a driving assembly. A compression cavity is formed between the moving scroll plate and the stationary scroll plate. The moving scroll plate, the stationary scroll plate, and the driving assembly are arranged in the housing. A refrigerant passage is provided on the stationary scroll plate. One end of the refrigerant passage is communicated with the refrigerant pipe, and the other end is communicated with the inlet of the compression cavity. The refrigerant pipe is connected with the refrigerant pump.

9. The refrigeration system with an oil forced lubrication function according to claim 7, characterized in that, When the compressor is a scroll compressor, the scroll compressor includes: a housing, a moving scroll plate, a stationary scroll plate, and a driving assembly. A compression cavity is formed between the moving scroll plate and the stationary scroll plate. The moving scroll plate, the stationary scroll plate, and the driving assembly are arranged in the housing. A refrigerant passage is provided on the stationary scroll plate. One end of the refrigerant passage is communicated with the refrigerant pipe, and the other end is respectively communicated with the inlet of the compression cavity and the compressor exhaust port. The refrigerant pipe is connected with the refrigerant pump.

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