Refrigeration system

Abstract

The utility model provides a refrigeration system. The refrigerating system comprises compressor branches and a condenser, the at least two compressor branches are connected in parallel, each compressor branch comprises a compressor and an oil separator which are connected in series, the condenser comprises a first end and a second end, the first end is communicated with the oil separators, and the second end is communicated with the compressors, so that the condenser is connected with the at least two compressor branches connected in parallel. A medium circularly flows between the compressor branches and the condenser, the oil separator comprises a first oil return end, the first oil return end is connected with the compressor, oil enters the oil separator from the compressor and then returns into the compressor through the first oil return end, and the compressor and the oil separator in each compressor branch are connected in a one-to-one correspondence mode. Therefore, the oil return condition of each compressor in the refrigerating system is not influenced by the power difference of each compressor, each compressor can keep a more stable oil return state, the stability of the compressor and the refrigerating system is improved, and the service life of the compressor is prolonged.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a refrigeration system. Background Art

[0002] At present, with the development and application of central air conditioners, small and medium-sized heat pump module units, large-scale water-cooled cabinet units, chillers, air-cooled condensing units, etc., the host manufacturers have higher and higher requirements for the adjustable capacity of compressors. Therefore, it has become a market trend in the air conditioning and refrigeration industries to use small-power compressors in parallel instead of large compressors.

[0003] However, in the refrigeration system, the parallel compressor units have insufficient operating stability and are in urgent need of improvement. Utility Model Content

[0004] In view of the above problems, the present application provides a refrigeration system, which can improve the operating stability of the parallel compressor units in the refrigeration system to improve the overall stability of the refrigeration system.

[0005] The present application provides a refrigeration system, comprising: a compressor branch, at least two compressor branches are connected in parallel, the compressor branch comprises a compressor and an oil separator connected in series, a condenser, comprising a first end and a second end, the first end is connected to each oil separator, and the second end is connected to each compressor, wherein the oil separator comprises a first oil return end, the first oil return end is connected to the compressor, so that after the oil enters the oil separator from the compressor, it returns to the compressor via the first oil return end.

[0006] In the technical solution of the embodiment of the present application, the refrigeration system includes a compressor branch and a condenser, at least two compressor branches are connected in parallel, the compressor branch includes a compressor and an oil separator connected in series, the condenser includes a first end and a second end, the first end is connected to each oil separator, and the second end is connected to each compressor, so that the condenser is connected to at least two compressor branches in parallel, and the medium circulates between each compressor branch and the condenser. The oil separator includes a first oil return end, and the first oil return end is connected to the compressor. After the oil enters the oil separator from the compressor, it returns to the compressor through the first oil return end. By connecting the compressor and the oil separator in each compressor branch one by one, the oil return condition of each compressor in the refrigeration system will not be affected by the power difference of each compressor, and each compressor can maintain a more stable oil return state, so as to improve the stability of the compressor and the refrigeration system and improve the service life of the compressor.

[0007] In some embodiments, the compressor includes an intake end and an exhaust end, the oil separator also includes an input end and an output end, the exhaust end is connected to the input end, the output end is connected to the first end, the first oil return end is connected to the intake end, and the oil separator is configured so that the pressure difference between the first oil return end and the intake end reaches a first threshold, and the oil reaches the intake end from the first oil return end.

[0008] In the technical solution of the embodiment of the present application, the compressor includes an intake end and an exhaust end, the oil separator includes an input end, an output end and a first oil return end, the exhaust end and the input end are connected, the high-pressure medium enters the oil separator from the exhaust end, causing the internal pressure of the oil separator to increase, the output end and the first end are connected, the first oil return end and the intake end are connected, the oil separator is configured so that the pressure difference between the first oil return end and the intake end reaches a first threshold, and the oil reaches the intake end from the first oil return end, thereby when the compressor lacks oil and causes the pressure at the exhaust port to increase, the internal pressure of the oil separator and the pressure difference at the intake end increase, and when this pressure difference reaches the first threshold, the oil separator returns oil to the compressor, so that the oil separator can adjust the oil return amount of the compressor in real time to improve the service life and stability of the compressor.

[0009] In some embodiments, the oil separator includes a chamber and an oil return valve, the chamber is connected to the exhaust end, the chamber is used to contain oil, the oil return valve is arranged between the chamber and the suction end, and the oil return valve is configured so that when the pressure difference between the chamber and the suction end reaches a first threshold, the oil return valve connects the chamber and the suction end.

[0010] In the technical solution of the embodiment of the present application, the oil separator includes a chamber and an oil return valve. The chamber is connected to the exhaust end, the chamber is used to contain oil, and the oil return valve is arranged between the chamber and the suction end. The oil return valve is configured so that the pressure difference between the chamber and the suction end reaches a first threshold value. The oil return valve connects the chamber and the suction end, thereby the oil return amount from the oil separator to the compressor can be accurately controlled through the oil return valve, so as to facilitate the control of the working state of the compressor.

[0011] In some embodiments, the compressor branch includes a first valve, which is arranged between the first oil return end and the suction end, and the opening of the first valve is adjustable.

[0012] In the technical solution of the embodiment of the present application, the compressor branch includes a first valve, which is arranged between the first oil return end and the suction end. The opening of the first valve is adjustable. The first valve can be used to conveniently control the amount of oil returned from the oil separator to the compressor, so as to conveniently control the working state of the compressor and improve the stability of the compressor.

[0013] In some embodiments, the oil separator and the compressor are arranged along the direction of gravity, so that the oil enters the compressor from the oil separator under the action of gravity.

[0014] In the technical solution of the embodiment of the present application, the oil separator and the compressor are arranged along the direction of gravity, and the oil in the oil separator enters the compressor under the action of gravity. The structure is simple and the installation difficulty is low.

[0015] In some embodiments, the compressor branch includes a second valve disposed between the oil separator and the compressor, and the second valve is used to control the on-off state between the first oil return end and the compressor.

[0016] In the technical solution of the embodiment of the present application, the compressor branch includes a second valve arranged between the oil separator and the compressor, and the second valve is used to control the on-off state between the first oil return end and the compressor to facilitate the control of the oil return state from the oil separator to the compressor.

[0017] In some embodiments, the condenser includes a second oil return end, and the second oil return end is in communication with the compressor, so that the oil reaches the compressor via the second oil return end.

[0018] In the technical solution of the embodiment of the present application, the condenser includes a second oil return end, and the second oil return end is connected to the compressor so that the oil reaches the compressor via the second oil return end, so that the oil entering the condenser following the medium can return to the compressor from the second oil return end, thereby improving the oil utilization rate in the refrigeration system, improving the oil return problem of the compressor, and improving the operating stability of the compressor.

[0019] In some embodiments, the power of each compressor in each compressor branch is different, and the second oil return end is connected to the compressor with the largest power.

[0020] In the technical solution of the embodiment of the present application, the power of each compressor in each compressor branch is different, and the second oil return end is connected to the compressor with the largest power, so as to reduce the risk of oil shortage in the high-power compressor and improve the overall stability of the refrigeration system.

[0021] In some embodiments, the refrigeration system includes a third valve, which is arranged between the second oil return end and the compressor, and the opening of the third valve is adjustable.

[0022] In the technical solution of the embodiment of the present application, the refrigeration system includes a third valve, which is arranged between the second oil return end and the compressor. The third valve has an adjustable opening. The third valve is used to adjust the amount of oil return from the second oil return end to the compressor to facilitate the adjustment of the compressor state and improve the stability of the compressor.

[0023] In some embodiments, the compressor branch further includes a one-way valve disposed between the oil separator and the condenser.

[0024] In the technical solution of the embodiment of the present application, the compressor branch also includes a one-way valve, which is arranged between the oil separator and the condenser to improve the problem of oil-containing medium entering other compressors, causing oil shortage in some compressors, thereby improving the operating stability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0026] Figure 1 is a structural schematic diagram of a refrigeration system provided in one embodiment of the present application;

[0027] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0028] Figure 3 is a structural schematic diagram of a refrigeration system provided by another embodiment of the present application;

[0029] Figure 4 It is a structural schematic diagram of a refrigeration system provided in yet another embodiment of the present application.

[0030] Description of reference numerals:

[0031] 1. Refrigeration system;

[0032] 11. compressor branch; 111. compressor; 112. oil separator; 1121. input end; 1122. output end; 1123. first oil return end; 113. first valve; 114. second valve; 115. third valve; 116. check valve; 1111. suction end; 1112. exhaust end;

[0033] 12, condenser; 121, first end; 122, second end; 123, second oil return end;

[0034] 13. Evaporator;

[0035] 14. Throttle valve. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0038] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0039] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0040] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] At present, with the development and application of central air conditioners, small and medium-sized heat pump module units, large-scale water-cooled cabinet units, chillers, air-cooled condensing units, etc., the host manufacturers have higher and higher requirements for the adjustable capacity of compressors. Therefore, it has become a market trend in the air conditioning and refrigeration industries to use small-power compressors in parallel instead of large compressors. However, in parallel compressor units, the service life of the compressors has not reached expectations, and the compressor operation stability is poor.

[0043] In the related technology, the compressor needs lubricating oil to provide lubrication, cooling and sealing during operation. During the operation of the compressor, part of the lubricating oil will flow out of the compressor with the medium, causing the compressor to have an "oil shortage" problem. Therefore, it is necessary to connect an oil separator in series with the compressor. The oil separator separates the lubricating oil in the medium and returns it to the compressor. At present, the compressors connected in parallel in the refrigeration system are connected in series with the same oil separator. The lubricating oil separated by the oil separator is similar to being equally divided into each compressor. However, due to the different powers of the compressors, the oil return requirements of the compressors are different, which makes the compressors with larger powers more prone to "oil shortage" problems, resulting in unstable operation of the compressor, reduced service life of the compressor, and reduced overall stability of the refrigeration system.

[0044] Based on the above problems, an embodiment of the present application provides a refrigeration system, which includes a compressor branch and a condenser, at least two compressor branches are connected in parallel, the compressor branch includes a compressor and an oil separator connected in series, the condenser includes a first end and a second end, the first end is connected to each oil separator, and the second end is connected to each compressor, so that the condenser is connected to at least two compressor branches in parallel, and the medium circulates between each compressor branch and the condenser, the oil separator includes a first oil return end, and the first oil return end is connected to the compressor. After the oil enters the oil separator from the compressor, it returns to the compressor through the first oil return end. By connecting the compressor and the oil separator in each compressor branch one by one, the oil return condition of each compressor in the refrigeration system will not be affected by the power difference of each compressor, and each compressor can maintain a more stable oil return state, so as to improve the stability of the compressor and the refrigeration system, and improve the service life of the compressor.

[0045] See also Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of a refrigeration system provided in one embodiment of the present application; Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0046] like Figure 1 and Figure 2 As shown, the present application provides a refrigeration system 1, which includes at least two compressor branches 11 and a condenser 12 connected in parallel, the compressor branch 11 includes a compressor 111 and an oil separator 112 connected in series, the condenser 12 includes a first end 121 and a second end 122, the first end 121 is connected to each oil separator 112, and the second end 122 is connected to each compressor 111, wherein the oil separator 112 includes a first oil return end 1123, and the first oil return end 1123 is connected to the compressor 111, so that after the oil enters the oil separator 112 from the compressor 111, it returns to the compressor 111 via the first oil return end 1123.

[0047] In the technical solution of the embodiment of the present application, the refrigeration system 1 includes a compressor branch 11 and a condenser 12, at least two compressor branches 11 are connected in parallel, the compressor branch 11 includes a compressor 111 and an oil separator 112 connected in series, the condenser 12 includes a first end 121 and a second end 122, the first end 121 is connected to each oil separator 112, and the second end 122 is connected to each compressor 111, so that the condenser 12 is connected to at least two compressor branches 11 in parallel, and the medium circulates between each compressor branch 11 and the condenser 12, and the oil separator 112 includes a first return The oil end 1123, the first oil return end 1123 and the compressor 111 are connected. After the oil enters the oil separator 112 from the compressor 111, it returns to the compressor 111 through the first oil return end 1123. By making the compressor 111 and the oil separator 112 in each compressor branch 11 connected one by one, the oil return conditions of each compressor 111 in the refrigeration system 1 will not be affected by the power difference of each compressor 111. Each compressor 111 can maintain a more stable oil return state, so as to improve the stability of the compressor 111 and the refrigeration system 1, and improve the service life of the compressor 111.

[0048] The refrigeration system 1 of the embodiment of the present application includes an evaporator 13 and a throttle valve 14 in addition to a condenser 12 and a compressor branch 11 including a compressor 111. The evaporator 13, the compressor branch 11, the condenser 12 and the throttle valve 14 are connected in sequence through pipelines to form a closed system, and the medium circulates in the system. The medium is usually a refrigerant, which can be air, water, or Freon, etc. In the refrigeration system 1, the evaporator 13 is a device for conveying cold, in which the refrigerant absorbs the heat of the cooled object to achieve refrigeration; the compressor 111 plays the role of sucking, compressing, and conveying the refrigerant; the high-temperature and high-pressure refrigerant discharged by the compressor 111 enters the condenser 12, and the condenser 12 is a device that releases heat. The condenser 12 transfers the heat absorbed in the evaporator 13 together with the heat converted by the work of the compressor 111 to the cooling medium for removal; the throttle valve 14 plays a throttling and pressure-reducing role on the refrigerant, and at the same time controls and adjusts the amount of refrigerant liquid flowing into the evaporator 13, and divides the system into two major parts: the high-pressure side and the low-pressure side.

[0049] Optionally, in addition to the above four major components, the refrigeration system 1 is often provided with some auxiliary equipment, such as solenoid valves, distributors, dryers, collectors, fusible plugs, pressure controllers and other components, which are provided to improve the economy, reliability and safety of operation. These components can be flexibly designed according to actual conditions.

[0050] The compressor branch 11 includes a compressor 111 and an oil separator 112 connected in series. When the compressor 111 is in operation, lubricating oil is required to provide cooling and lubrication for it. As the compressor 111 discharges high-temperature and high-pressure refrigerant, part of the oil is taken out with the refrigerant, so the compressor 111 needs to be connected in series with an oil separator 112. The oil separator 112 is connected to the compressor 111 and the condenser 12 respectively. The high-temperature and high-pressure refrigerant discharged by the compressor 111 first enters the oil separator 112, and the oil is separated from the refrigerant in the oil separator 112. Then the refrigerant leaves the oil separator 112 and enters the inside of the condenser 12 through the first end 121. The oil in the oil separator 112 returns to the compressor 111 through the first oil return end 1123 to replenish the oil in the compressor 111.

[0051] In the refrigeration system 1, each compressor branch 11 includes an oil separator 112, and each oil separator 112 is arranged in a one-to-one correspondence with each compressor 111. The first end 121 of the condenser 12 is connected to each oil separator 112, and the oil separators 112 located in the same compressor branch 11 return oil to the compressor 111 located in the same compressor branch 11.

[0052] Compared to the prior art scheme in which one oil separator 112 is connected to multiple compressors 111, in the embodiment of the present application, in the compressor branch 11, the compressor 111 and the oil separator 112 are connected one-to-one, and the amount of oil returned from the oil separator 112 to the compressor 111 will not be affected by the power of the compressor 111, so that the compressor 111 of each compressor branch 11 can obtain a qualified amount of oil return, so that the compressor 111 can operate stably.

[0053] Exemplarily, the refrigeration system 1 includes two compressor branches 11, each compressor branch 11 includes a compressor 111 and a separator connected in series. The compressor 111 may be a scroll compressor 111 or a screw compressor 111. The oil separator 112 may be a washing oil separator 112, a centrifugal oil separator 112, a packing oil separator 112, or a filtering oil separator 112, etc.

[0054] In some embodiments, Figure 1 and Figure 2 As shown, the compressor 111 includes an intake end 1111 and an exhaust end 1112, and the oil separator 112 also includes an input end 1121 and an output end 1122, the exhaust end 1112 is connected to the input end 1121, the output end 1122 is connected to the first end 121, the first oil return end 1123 is connected to the intake end 1111, and the oil separator 112 is configured so that the pressure difference between the first oil return end 1123 and the intake end 1111 reaches a first threshold, and the oil reaches the intake end 1111 from the first oil return end 1123.

[0055] In these embodiments, the compressor 111 includes an air intake end 1111 and an air discharge end 1112, the oil separator 112 includes an input end 1121, an output end 1122 and a first oil return end 1123, the exhaust end 1112 is connected to the input end 1121, the high-pressure medium enters the oil separator 112 from the exhaust end 1112, causing the internal pressure of the oil separator 112 to increase, the output end 1122 is connected to the first end 121, the first oil return end 1123 is connected to the air intake end 1111, and the oil separator 112 is configured as a first return end. The pressure difference between the oil end 1123 and the suction end 1111 reaches a first threshold value, and the oil reaches the suction end 1111 from the first oil return end 1123. Therefore, when the compressor 111 lacks oil and causes the pressure at the exhaust end 1112 to increase, the pressure difference between the internal pressure of the oil separator 112 and the suction end 1111 increases. When this pressure difference reaches the first threshold value, the oil separator 112 returns oil to the compressor 111. In this way, the oil separator 112 can adjust the oil return amount of the compressor 111 in real time to improve the service life and stability of the compressor 111.

[0056] The refrigerant enters from the suction end 1111 of the compressor 111, is discharged from the exhaust end 1112 after being heated and pressurized in the compressor 111, and enters the oil separator 112 through the input end 1121. The high-temperature and high-pressure refrigerant also increases the pressure in the oil separator 112 after the oil is separated in the oil separator 112. There is a pressure difference between the first oil return end 1123 of the oil separator 112 and the suction end 1111 of the compressor 111. When the amount of lubricating oil in the compressor 111 decreases, the cooling effect of the lubricating oil on the refrigerant decreases, and impurities such as carbon deposits in the compressor 111 increase and block some of the pipes in the compressor 111, resulting in an increase in the pressure at the exhaust end 1112. As a result, the pressure difference between the first oil return end 1123 and the suction end 1111 of the oil separator 112 increases. When the pressure difference exceeds the first threshold, the oil in the oil separator 112 flows to the compressor 111 through the first oil return end 1123, reducing the oil shortage problem of the compressor 111 and improving the operating stability of the compressor 111. After the oil separator 112 returns oil to the compressor 111, the pressure at the exhaust end 1112 of the compressor 111 decreases, and the pressure difference between the first oil return end 1123 and the suction end 1111 decreases. The oil separator 112 no longer returns oil to the compressor 111, so as to improve the problem of excessive oil in the compressor 111, which causes oil to block the compressor 111 and cause the compressor 111 to stop secretly.

[0057] The suction end 1111 of the compressor 111 is connected to the first oil return end 1123, and the suction end 1111 includes two pipe openings spaced apart from each other in the compressor 111, one pipe opening is used to connect to the first oil return end 1123, and the other pipe opening is used to input refrigerant; or the suction end 1111 is a pipe opening opened in the compressor 111, the first oil return end 1123 is connected to the pipe opening, and the refrigerant also enters the compressor 111 from the port. For ease of understanding, in the drawings of the present application, the first oil return end 1123 and the refrigerant inlet of the compressor 111 share a pipe opening of the suction end 1111.

[0058] The first threshold value can be flexibly designed according to actual conditions, so that the oil separator 112 can return oil to the compressor 111 in a timely manner to maintain stable operation of the compressor 111. The first threshold values ​​of the oil separators 112 located in different compressor branches 11 are the same or different.

[0059] The first oil return end 1123 and the air intake end 1111 are connected by a pipeline, and the first threshold value is adjusted by adjusting at least one of the friction of the inner wall of the pipeline, the length of the pipeline, the diameter of the pipeline, and the inclination angle of the pipeline. For example, the first threshold value can be increased by extending the length of the pipeline, and the first threshold value can be reduced by reducing the friction of the inner wall of the pipeline.

[0060] And / or, in some embodiments, the oil separator 112 includes a chamber and an oil return valve, the chamber is connected to the exhaust end 1112, the chamber is used to contain oil, the oil return valve is arranged between the chamber and the suction end 1111, and the oil return valve is configured so that when the pressure difference between the chamber and the suction end 1111 reaches a first threshold, the oil return valve connects the chamber and the suction end 1111.

[0061] In these embodiments, the oil separator 112 includes a chamber and an oil return valve. The chamber is connected to the exhaust end 1112. The chamber is used to contain oil. The oil return valve is arranged between the chamber and the suction end 1111. The oil return valve is configured so that the pressure difference between the chamber and the suction end 1111 reaches a first threshold value. The oil return valve connects the chamber and the suction end 1111. Therefore, the amount of oil returned from the oil separator 112 to the compressor 111 can be accurately controlled through the oil return valve, so as to facilitate the control of the working state of the compressor 111.

[0062] The chamber is connected to the exhaust end 1112, and the high-temperature and high-pressure refrigerant is discharged into the chamber, causing the pressure in the chamber to increase. The oil return valve connects the chamber and the suction end 1111. When the pressure difference between the chamber pressure and the suction end 1111 reaches a first threshold, the oil return valve opens, the suction end 1111 is connected to the chamber, and the oil returns to the compressor 111. Therefore, the size of the first threshold can be adjusted by adjusting the opening threshold of the oil return valve.

[0063] Optionally, the opening pressure of the oil return valve can be adjusted so that the oil separator 112 can adapt to the refrigeration system 1 in different application scenarios.

[0064] Optionally, the opening pressures of the oil return valves of the oil separators 112 located in different compressor branches 11 are the same or different.

[0065] In some embodiments, Figure 1 and Figure 2 As shown, the compressor branch 11 includes a first valve 113, which is arranged between the first oil return end 1123 and the suction end 1111, and the opening of the first valve 113 is adjustable.

[0066] In these embodiments, the compressor branch 11 includes a first valve 113, which is arranged between the first oil return end 1123 and the suction end 1111. The opening of the first valve 113 is adjustable. The first valve 113 can be used to conveniently control the amount of oil returned from the oil separator 112 to the compressor 111, so as to conveniently control the working state of the compressor 111 and improve the stability of the compressor 111.

[0067] Specifically, the first valve 113 is disposed on a pipeline connecting the first oil return end 1123 and the air intake end 1111, and the amount of oil returned from the oil separator 112 to the compressor 111 is adjusted by adjusting the opening of the first valve 113. Optionally, one or more first valves 113 may be disposed between the first oil return end 1123 and the air intake end 1111 to facilitate accurate adjustment of the amount of oil returned.

[0068] Exemplarily, the first valve 113 may be a solenoid valve, a pneumatic valve, or a hand wheel.

[0069] See also Figure 3 , Figure 3 It is a structural schematic diagram of a refrigeration system provided in another embodiment of the present application.

[0070] In some embodiments, Figure 3 As shown, the oil separator 112 and the compressor 111 are arranged along the gravity direction so that the oil enters the compressor 111 from the oil separator 112 under the action of gravity.

[0071] In these embodiments, the oil separator 112 and the compressor 111 are arranged along the direction of gravity, and the oil in the oil separator 112 enters the compressor 111 under the action of gravity. The structure is simple and the installation difficulty is low.

[0072] The first oil return port 1123 of the oil separator 112 and the compressor 111 are arranged along the gravity direction, so that the oil in the oil separator 112 can overcome the pipeline friction force under the action of gravity and return to the compressor 111.

[0073] Optionally, the pipeline between the first oil return port 1123 and the compressor 111 extends in the direction of gravity to increase the oil return speed; or the pipeline between the first oil return port 1123 and the compressor 111 extends obliquely in the direction of gravity, and the oil return speed of the pipeline is adjusted by adjusting the inclination and length of the pipeline.

[0074] In some embodiments, Figure 3 As shown, the compressor branch 11 includes a second valve 114 disposed between the oil separator 112 and the compressor 111 , and the second valve 114 is used to control the on-off state between the first oil return end 1123 and the compressor 111 .

[0075] In these embodiments, the compressor branch 11 includes a second valve 114 arranged between the oil separator 112 and the compressor 111, and the second valve 114 is used to control the on-off state between the first oil return end 1123 and the compressor 111, so as to facilitate the control of the oil return state from the oil separator 112 to the compressor 111.

[0076] Optionally, the second valve 114 is a switch valve, and the second valve 114 includes an open state and a closed state. When the compressor 111 is running, the second valve 114 is in the open state, and the oil separator 112 can return oil to the compressor 111. When the compressor 111 stops running, the second valve 114 is in the closed state.

[0077] Optionally, the second valve 114 may be configured with an adjustable opening to adjust the return oil flow rate of the first oil return end 1123 and the compressor 111 .

[0078] See also Figure 4 , Figure 4 It is a structural schematic diagram of a refrigeration system provided in yet another embodiment of the present application.

[0079] In some embodiments, Figure 4 As shown, the condenser 12 includes a second oil return end 123 , and the second oil return end 123 is in communication with the compressor 111 , so that the oil reaches the compressor 111 via the second oil return end 123 .

[0080] In these embodiments, the condenser 12 includes a second oil return end 123, and the second oil return end 123 is connected to the compressor 111 so that the oil reaches the compressor 111 via the second oil return end 123, so that the oil entering the condenser 12 following the medium can return to the compressor 111 from the second oil return end 123, thereby improving the oil utilization rate in the refrigeration system 1, improving the oil return problem of the compressor 111, and improving the operating stability of the compressor 111.

[0081] Some of the oil mixed in the refrigerant cannot be completely separated in the oil separator 112, and will enter the condenser 12 along with the refrigerant. In the long run, the compressor 111 will still have the problem of lack of oil. Therefore, the condenser 12 is provided with a second oil return terminal 123, so that the oil entering the condenser 12 returns to the compressor 111 through the second oil return terminal 123.

[0082] Exemplarily, a sedimentation hole or a capillary structure is provided in the condenser 12 to separate and collect the oil in the refrigerant, and then the oil returns to the compressor 111 through the second oil return port 123 to improve the problem of oil shortage in the compressor 111.

[0083] The oil output from the second oil return end 123 can return to the compressor 111 under the action of gravity; or the second oil return end 123 is connected to the suction end 1111 of the compressor 111, and under the action of the pressure difference between the second oil return end 123 and the suction end 1111, the oil enters the compressor 111 from the second oil return end 123.

[0084] In some embodiments, Figure 4 As shown, the power of each compressor 111 of each compressor branch 11 is different, and the second oil return end 123 is connected to the compressor 111 with the largest power.

[0085] In these embodiments, the power of each compressor 111 of each compressor branch 11 is different, and the second oil return end 123 is connected to the compressor 111 with the largest power, thereby reducing the risk of oil shortage in the high-power compressor 111 and improving the stability of the refrigeration system 1.

[0086] The oil separated in the condenser 12 comes from the compressors 111 of different powers. Relatively speaking, the majority of the oil comes from the high-power compressor 111. If the second oil return port 123 is connected to each compressor 111, the low-power compressor 111 may have an excessive amount of oil, while the high-power compressor 111 may have an oil shortage. Therefore, in the embodiment of the present application, the second oil return port 123 is only connected to the high-power compressor 111 to maintain the amount of oil in the high-power compressor 111, so as to improve the overall stability of the refrigeration system 1.

[0087] It should be noted that, in the refrigeration system 1 , there may be one or more high-power compressors 111 . If there are multiple high-power compressors 111 , the second oil return port 123 is in communication with each high-power compressor 111 .

[0088] Exemplarily, the refrigeration system 1 includes a first compressor branch 11 and a second compressor branch 11, the power of the compressor 111 of the first compressor branch 11 is greater than the power of the compressor 111 of the second compressor branch 11, and the second oil return end 123 is only connected to the compressor 111 of the first compressor branch 11.

[0089] In some embodiments, Figure 4 As shown, the refrigeration system 1 includes a third valve 115, which is arranged between the second oil return end 123 and the compressor 111, and the opening of the third valve 115 is adjustable.

[0090] In these embodiments, the refrigeration system 1 includes a third valve 115, which is arranged between the second oil return end 123 and the compressor 111. The opening of the third valve 115 is adjustable. The third valve 115 is used to adjust the amount of oil returned from the second oil return end 123 to the compressor 111, so as to facilitate the adjustment of the state of the compressor 111 and improve the stability of the compressor 111.

[0091] Specifically, the third valve 115 is disposed on a pipeline connecting the second oil return terminal 123 and the compressor 111, and the amount of return oil from the condenser 12 to the compressor 111 is adjusted by adjusting the opening of the third valve 115. Optionally, one or more third valves 115 may be disposed between the second oil return terminal 123 and the compressor 111 to facilitate accurate adjustment of the return oil amount.

[0092] Exemplarily, the third valve 115 may be a solenoid valve, a pneumatic valve, or a hand wheel.

[0093] In some embodiments, Figure 4 As shown, the compressor branch 11 further includes a one-way valve 116 , which is disposed between the oil separator 112 and the condenser 12 .

[0094] In these embodiments, the compressor branch 11 also includes a one-way valve 116, which is arranged between the oil separator 112 and the condenser 12 to improve the problem of the medium containing oil entering other compressors 111, causing some compressors 111 to lack oil, thereby improving the operating stability of the compressor 111.

[0095] By providing the one-way valve 116, the refrigerant can only flow from the compressor 111 into the condenser 12, but cannot flow in the reverse direction.

[0096] There is still some oil mixed in the refrigerant after passing through the oil separator 112, so a one-way valve 116 is set between the oil separator 112 and the condenser 12, so that this part of the oil will only enter the condenser 12, and then return to the compressor 111 through the second oil return port 123, and will not enter other compressors 111, resulting in the problem of oil shortage in the high-power compressor 111.

[0097] Exemplarily, the refrigeration system 1 includes a first compressor branch 11 and a second compressor branch 11, wherein the first compressor branch 11 includes a first compressor 111, a first oil separator 112 and a first one-way valve 116, and the second compressor branch 11 includes a second compressor 111, a second oil separator 112 and a second one-way valve 116. The first one-way valve 116 is disposed between the first oil separator 112 and the condenser 12, and the second one-way valve 116 is disposed between the second oil separator 112 and the condenser 12. After the refrigerant of the first compressor 111 leaves the oil separator 112, it will enter the condenser 12 through the first one-way valve 116, and part of the refrigerant of the first compressor 111 will flow toward the second compressor 111, and then part of the refrigerant will be intercepted by the second one-way valve 116. The second one-way valve 116 is similar.

[0098] In some embodiments, Figures 1 to 4 As shown, the refrigeration system 1 includes at least two compressor branches 11 and a condenser 12 connected in parallel, the compressor branch 11 includes a compressor 111 and an oil separator 112 connected in series, the compressor 111 includes an air intake end 1111 and an air discharge end 1112, the oil separator 112 includes an input end 1121, an output end 1122 and a first oil return end 1123, the condenser 12 includes a first end 121, a second end 122 and a second oil return end 123, the exhaust end 1112 is connected to the input end 1121, the output end 1122 is connected to the first end 121, the first oil return end 1123 is connected to the air intake end 1111, the second end 122 is connected to the air intake end 1111 of each compressor 111, the first end 121 is connected to the input end 1121 of each oil separator 112, So that after the oil enters the oil separator 112 from the compressor 111, it returns to the compressor 111 via the first oil return end 1123; the oil separator 112 includes a chamber and an oil return valve, the chamber is connected to the exhaust end 1112, the chamber is used to contain the oil, the oil return valve is arranged between the chamber and the suction end 1111, the oil return valve is configured so that the pressure difference between the chamber and the suction end 1111 reaches a first threshold value, the oil return valve connects the chamber and the suction end 1111, a first valve 113 is arranged between the first oil return end 1123 and the suction end 1111, the opening of the first valve 113 is adjustable, a third valve 115 is arranged between the second oil return end 123 and the compressor 111, the opening of the third valve 115 is adjustable, and a one-way valve 116 is arranged between the oil separator 112 and the condenser 12.

[0099] In the technical solution of the embodiment of the present application, the refrigeration system 1 includes a compressor branch 11 and a condenser 12, at least two compressor branches 11 are connected in parallel, the compressor branch 11 includes a compressor 111 and an oil separator 112 connected in series, the condenser 12 includes a first end 121 and a second end 122, the first end 121 is connected to each oil separator 112, and the second end 122 is connected to each compressor 111, so that the condenser 12 is connected to at least two compressor branches 11 in parallel, and the medium circulates between each compressor branch 11 and the condenser 12, and the oil separator 112 includes a first return The oil end 1123, the first oil return end 1123 and the compressor 111 are connected. After the oil enters the oil separator 112 from the compressor 111, it returns to the compressor 111 through the first oil return end 1123. By making the compressor 111 and the oil separator 112 in each compressor branch 11 connected one by one, the oil return conditions of each compressor 111 in the refrigeration system 1 will not be affected by the power difference of each compressor 111. Each compressor 111 can maintain a more stable oil return state, so as to improve the stability of the compressor 111 and the refrigeration system 1, and improve the service life of the compressor 111.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A refrigeration system, characterized in that: include: A compressor branch, at least two of which are connected in parallel, wherein the compressor branch comprises a compressor and an oil separator connected in series, A condenser comprises a first end and a second end, wherein the first end is connected to each of the oil separators, and the second end is connected to each of the compressors. The oil separator comprises a first oil return end, and the first oil return end is connected to the compressor so that after the oil enters the oil separator from the compressor, it returns to the compressor via the first oil return end.

2. The refrigeration system according to claim 1, characterized in that: The compressor includes an air intake end and an air discharge end, the oil separator also includes an input end and an output end, the exhaust end is connected to the input end, the output end is connected to the first end, and the first oil return end is connected to the air intake end. The oil separator is configured such that when the pressure difference between the first oil return end and the air intake end reaches a first threshold, oil flows from the first oil return end to the air intake end.

3. The refrigeration system according to claim 2, characterized in that: The oil separator includes a chamber and an oil return valve, the chamber is connected to the exhaust end, the chamber is used to contain oil, the oil return valve is arranged between the chamber and the intake end, and the oil return valve is configured so that when the pressure difference between the chamber and the intake end reaches a first threshold, the oil return valve connects the chamber and the intake end.

4. The refrigeration system according to claim 2, characterized in that: The compressor branch comprises a first valve, which is arranged between the first oil return end and the air intake end, and the opening of the first valve is adjustable.

5. The refrigeration system according to claim 1, characterized in that: The oil separator and the compressor are arranged along the direction of gravity, so that the oil enters the compressor from the oil separator under the action of gravity.

6. The refrigeration system according to claim 5, characterized in that: The compressor branch includes a second valve disposed between the oil separator and the compressor, and the second valve is used to control the on-off state between the first oil return end and the compressor.

7. The refrigeration system according to claim 1, characterized in that: The condenser includes a second oil return end, and the second oil return end is communicated with the compressor so that the oil reaches the compressor via the second oil return end.

8. The refrigeration system according to claim 7, characterized in that: The power of each compressor in each compressor branch is different, and the second oil return end is connected to the compressor with the largest power.

9. The refrigeration system according to claim 7, characterized in that: The refrigeration system comprises a third valve, which is arranged between the second oil return end and the compressor, and the opening of the third valve is adjustable.

10. The refrigeration system according to claim 1, characterized in that: The compressor branch further comprises a one-way valve, which is arranged between the oil separator and the condenser.

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