Refrigeration oil balancing device for multiple units of refrigeration house

Abstract

The utility model relates to the technical field of refrigerating systems, and provides a refrigeration oil balancing device for multiple units of a refrigeration house, the refrigeration oil balancing device comprises an oil return pipeline and an oil supply electromagnetic valve, the input end of the oil return pipeline is communicated with a quick freezing system and a double-helix system, and the output end of the oil return pipeline is communicated with a low-temperature refrigeration house unit; the oil return pipeline is used for conveying refrigerant oil; the oil supply electromagnetic valve is connected to the oil return pipeline and used for controlling refrigerant oil to be conveyed along the oil return pipeline. The low-temperature refrigerator unit has the effect of balancing the oil level in the low-temperature refrigerator unit.

Description

Technical Field

[0001] This application relates to the technical field of refrigeration systems, and particularly to a refrigerant oil balancing device for multiple units in a cold storage. Background Art

[0002] A cold storage refers to a facility that uses artificial means to create an environment with a temperature or humidity different from the outside, and is also a constant temperature and humidity storage device for items such as food, liquids, chemicals, pharmaceuticals, vaccines, and scientific experiments. Cold storages are usually located near transportation ports or the place of origin. Compared with a refrigerator, a cold storage has a larger refrigeration area and the same refrigeration principle.

[0003] A cold storage mainly includes an external unit and an internal unit. The internal unit is installed inside the cold storage, and the external unit is installed inside the control room. When the internal unit (evaporator) operates, it discharges low-temperature and low-pressure dry saturated Freon vapor. The low-temperature and low-pressure dry saturated Freon vapor is reconverted into high-pressure and normal-temperature Freon liquid through the external unit, and the high-pressure and normal-temperature Freon liquid re-enters the internal unit for heat exchange, thereby achieving the effect of refrigerating the cold storage.

[0004] In the prior art, most cold storages use multiple units (high-pressure sharing) for refrigeration. In a traditional cold storage refrigeration system, the first unit only provides a cold source for the quick-freezing system (-35°C), the second unit only provides a cold source for the low-temperature cold storage system (-23°C), and the third unit only provides a cold source for the double helix (-42°C) system. To reduce investment, the high-pressure systems (high-pressure liquid storage tanks and evaporative condensers) of these three units share a set of devices.

[0005] In this case, there is often a thorny problem. When the production volume changes and the quick-freezing system and the double helix system are not in production, while the daily operating time of the low-temperature cold storage system is relatively fixed, due to the different lengths of time for each unit to start up, it is inevitable that the oil level will deviate. At this time, the oil in the oil separator of the low-temperature cold storage unit will continuously decrease, resulting in a low oil level. This not only keeps the compressor in a state of low oil level, but also easily leads to an oil shortage alarm of the compressor, affecting refrigeration, and seriously causing damage to the compressor head. Therefore, improvement is needed. Summary of the Utility Model

[0006] In order to balance the oil level in the low-temperature cold storage unit, this application provides a refrigerant oil balancing device for multiple units in a cold storage.

[0007] The refrigerant oil balancing device for multiple units in a cold storage provided by this application adopts the following technical solutions:

[0008] A refrigerant oil balance device for a multi-unit cold storage, comprising an oil return pipeline and an oil supply solenoid valve. The input end of the oil return pipeline is connected to a quick-freezing system and a double-screw system, and the output end of the oil return pipeline is connected to a low-temperature cold storage unit. The oil return pipeline is used to transport refrigerant oil; the oil supply solenoid valve is connected to the oil return pipeline and is used to control the transportation of refrigerant oil along the oil return pipeline.

[0009] By adopting the above technical solution, the oil level in the oil separator is monitored in real time by using an oil level sensor installed on the oil separator of the unit. When the oil level is detected to be low in one of the units, the oil replenishing valve of the unit with a low oil level (the low-temperature cold storage unit) is opened at this time, and the oil supply solenoid valve of the other unit (the quick-freezing system or the double-screw system unit) is opened. The refrigerant oil is supplied from the oil supply solenoid valve, passes through the installed oil return pipeline, reaches the solenoid valve for replenishing oil of the unit with a low oil level, and returns to the suction header of the unit, and thus is sucked into the compressor head by the compressor for lubrication. After being discharged by the compressor, it reaches the oil separator. By using the PLC automatic control system, the above actions are repeated until the low oil level alarm is lifted.

[0010] Preferably, it further comprises a one-way check valve. The one-way check valve is connected to the oil return pipeline and is used to control the flow direction of the refrigerant oil. The one-way check valve and the oil supply solenoid valve are arranged in sequence along the transportation direction of the oil return pipeline.

[0011] By adopting the above technical solution, due to the inconsistent starting time periods of several units, the pressures in several oil separators will be inconsistent. If the one-way check valve is not installed, it will cause the pressure in the oil separator to increase when one of the units is running, and thus the oil will be supplied to the oil separators of other non-running units. By installing the one-way check valve to restrict the flow direction of the refrigerant oil, the above problem can be solved.

[0012] Preferably, it further comprises a first ball valve and a second ball valve. Both the first ball valve and the second ball valve are connected to the oil return pipeline. The first ball valve is located between the one-way check valve and the oil supply solenoid valve, and the oil supply solenoid valve is located between the first ball valve and the second ball valve.

[0013] By adopting the above technical solution, since the oil supply solenoid valve is a relatively precise component, there may be foreign objects stuck in the oil supply solenoid valve during the operation of the system. After this situation occurs, the first ball valve and the second ball valve installed before and after the oil supply solenoid valve can be used. When the first ball valve and the second ball valve are closed, the oil supply solenoid valve can be repaired.

[0014] Preferably, the inner wall of the oil return pipeline is coated with an epoxy resin layer.

[0015] By adopting the above technical solution, the epoxy resin layer can improve the anti-corrosion ability of the inner wall of the oil return pipeline, reduce the corrosion of the oil return pipeline, and extend the service life.

[0016] Preferably, a liquid flow direction mark is provided on the oil return pipeline.

[0017] By adopting the above technical solution, the liquid flow direction mark can facilitate the staff to identify the flow direction of the refrigerant oil inside the oil return pipeline.

[0018] Preferably, it further comprises a frame and a limiting component, wherein the limiting component and the oil return pipeline are both connected to the frame, and the limiting component is used to limit the oil return pipeline.

[0019] By adopting the above technical solution, the limiting component can limit the oil return pipeline, thereby improving the stability of the installation of the oil return pipeline.

[0020] Preferably, the limit block assembly includes a first limit block and a second limit block, the first limit block and the second limit block are arranged opposite to each other, the first limit block is connected to the frame, and the second limit block is detachably connected to the first limit block, and when the first limit block and the second limit block are connected to each other, a limit groove for the return oil pipeline to pass through is formed between the first limit block and the second limit block.

[0021] By adopting the above technical solution, the oil return pipeline is limited in the limiting groove, thereby achieving the limitation of the oil return pipeline.

[0022] Preferably, the first limiting block and the second limiting block are detachably connected together by locking with fasteners.

[0023] By adopting the above technical solution, during installation, the oil return pipeline is placed on the first limit block, and then the second limit block is covered on the first limit block, and finally the first limit block and the second limit block are locked by using fasteners.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] (1) By setting up the oil return pipeline and the oil supply solenoid valve, when one of the units detects that the oil level is low, the oil replenishment valve of the unit with low oil level (low-temperature cold storage unit) is opened, and the oil supply solenoid valve of the other unit (quick freezing system or double screw system unit) is opened. The refrigerant oil is supplied from the oil supply solenoid valve, passes through the installed oil return pipeline, reaches the oil replenishment solenoid valve of the unit with low oil level, and returns to the return air manifold of the unit, and is then brought into the machine head for lubrication by the compressor suction air, and reaches the oil separator after the compressor exhausts. The PLC automatic control system is used to repeat the above actions until the low oil level alarm is lifted.

[0026] (2) By setting a one-way check valve, the one-way check valve can limit the flow direction of the refrigeration oil and reduce the possibility of oil being supplied to the oil separators of other units that are not in operation.

[0027] (3) By setting the first ball valve and the second ball valve, the fuel supply solenoid valve can be conveniently overhauled. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of the balancing device in an embodiment of the present application;

[0029] Figure 2 is a partial schematic structural diagram of the balancing device in an embodiment of the present application.

[0030] Reference Signs: 1, frame; 2, oil return pipeline; 3, fuel supply solenoid valve; 4, check valve; 5, first ball valve; 6, second ball valve; 7, limiting component; 71, first limiting block; 72, second limiting block; 8, limiting groove; 9, liquid flow direction mark. Detailed Embodiments

[0031] Next, the technical solutions of the present application will be described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can be embodied in various different forms and is not limited to the embodiments described herein.

[0032] In the description of the embodiments of the present application, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection; it can also be a detachable connection; or integrated; it can also be a mechanical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0035] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples shown in the present application.

[0036] The present application embodiment discloses a refrigeration oil balancing device for multiple units in a cold storage. Figure 1 The balancing device includes a frame 1, an oil return pipe 2 and an oil supply solenoid valve 3. The frame 1 is used as a carrier and is fixedly installed on the ground. The oil return pipe 2 is installed on the frame 1, the input end of the oil return pipe 2 is connected to the quick freezing system and the double helix system, the output end of the oil return pipe 2 is connected to the low-temperature cold storage unit, and the oil return pipe 2 is used to transport refrigerant oil. In some embodiments, the inner wall of the oil return pipe 2 is also coated with an epoxy resin layer; the epoxy resin layer can improve the corrosion resistance of the inner wall of the oil return pipe 2, reduce the corrosion of the oil return pipe 2, and extend the service life. The oil supply solenoid valve 3 is installed on the oil return pipe 2 to control the transportation of refrigerant oil along the oil return pipe 2.

[0037] The oil level of the oil separator is monitored in real time by using the oil level sensor installed on the oil separator of the unit. When one of the units detects that the oil level is low, the oil replenishment valve of the unit (low-temperature cold storage unit) with low oil level is opened, and the oil supply solenoid valve 3 of the other unit (quick freezing system or double screw system unit) is opened. The refrigeration oil is supplied from the oil supply solenoid valve 3, passes through the installed return oil pipeline 2, reaches the oil replenishment solenoid valve of the unit with low oil level, and returns to the return air manifold of the unit, and is then brought into the machine head for lubrication by the compressor suction air, and reaches the oil separator after the compressor exhausts. The PLC automatic control system is used to repeat the above actions until the low oil level alarm is released.

[0038] Specifically, a one-way check valve 4 is also installed on the oil return pipeline 2, and the one-way check valve 4 is used to control the flow direction of the refrigerant oil. The one-way check valve 4 and the oil supply solenoid valve 3 are sequentially arranged along the conveying direction of the oil return pipeline 2. In some embodiments, a liquid flow direction mark 9 is arranged on the oil return pipeline 2, and the liquid flow direction mark 9 can facilitate the staff to identify the flow direction of the refrigerant oil in the oil return pipeline 2.

[0039] Since the startup time periods of several units are inconsistent, the pressures in several oil separators will be inconsistent. If the one-way check valve 4 is not installed, the pressure of the oil separator will increase when one of the units is running, so that the oil is supplied to the oil separators of other units that are not running. The one-way check valve 4 is installed to limit the flow direction of the refrigeration oil, thereby solving the above problem.

[0040] In addition, the first ball valve 5 and the second ball valve 6 are installed on the oil return pipeline 2. The first ball valve 5 and the second ball valve 6 are both connected to the oil return pipeline 2. The first ball valve 5 is located between the one-way check valve 4 and the oil supply solenoid valve 3. The oil supply solenoid valve 3 is located between the first ball valve 5 and the second ball valve 6. Since the oil supply solenoid valve 3 is a relatively precise component, foreign matter may get stuck in the oil supply solenoid valve 3 when the system is running. When this happens, the first ball valve 5 and the second ball valve 6 installed before and after the oil supply solenoid valve 3 can be used. When the first ball valve 5 and the second ball valve 6 are closed, the oil supply solenoid valve 3 can be repaired.

[0041] In some embodiments, in combination Figure 2 , a limit assembly 7 is also installed on the frame 1, and the limit assembly is used to limit the return oil pipeline 2. The limit assembly 7 includes a first limit block 71 and a second limit block 72, and the first limit block 71 and the second limit block 72 are arranged relatively to each other up and down, the first limit block 71 is installed on the frame 1, and the second limit block 72 is detachably connected to the first limit block 71. In this embodiment, the first limit block 71 and the second limit block 72 are detachably connected by fastener locking, and the fastener is a fastening bolt or a fastening screw. Of course, the first limit block 71 and the second limit block 72 can also be connected by plugging or snapping. When the first limit block 71 and the second limit block 72 are connected to each other, a limit groove 8 for the return oil pipeline 2 to pass through is formed between the first limit block 71 and the second limit block 72.

[0042] During installation, the oil return pipe 2 is placed on the first limit block 71, and then the second limit block 72 is placed on the first limit block 71, and finally the first limit block 71 and the second limit block 72 are locked by fasteners. By limiting the oil return pipe 2 in the limit groove 8, the oil return pipe 2 is limited, and the stability of the oil return pipe 2 is improved.

[0043] The implementation principle of the refrigeration oil balancing device for multiple units in a cold storage in the embodiment of the present application is: the oil level of the oil separator is monitored in real time by using the oil level sensor installed on the unit oil separator. When one of the units detects that the oil level is low, the oil replenishment valve of the unit (low-temperature cold storage unit) with low oil level is opened, and the oil supply solenoid valve 3 of the other unit (quick freezing system or double screw system unit) is opened, and the refrigeration oil is supplied from the oil supply solenoid valve 3, passes through the installed return oil pipeline 2, reaches the oil replenishment solenoid valve of the unit with low oil level, and returns to the return air manifold of the unit, so that it is brought into the machine head for lubrication by the compressor suction, and reaches the oil separator after the compressor exhausts. The PLC automatic control system is used to repeat the above actions until the low oil level alarm is released.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A refrigerant oil balancing device for a multi-unit cold storage, characterized in that, It includes an oil return pipeline (2) and an oil supply solenoid valve (3). The input end of the oil return pipeline (2) is connected to the quick-freezing system and the double-screw system, the output end of the oil return pipeline (2) is connected to the low-temperature cold storage unit, and the oil return pipeline (2) is used for transporting refrigeration oil; the oil supply solenoid valve (3) is connected to the oil return pipeline (2) and is used to control the transportation of refrigeration oil along the oil return pipeline (2).

2. The refrigerant oil balancing device for a multi-unit cold storage according to claim 1, wherein, It further includes a one-way check valve (4). The one-way check valve (4) is connected to the oil return pipeline (2) and is used to control the flow direction of refrigeration oil. The one-way check valve (4) and the oil supply solenoid valve (3) are arranged in sequence along the transportation direction of the oil return pipeline (2).

3. The refrigerant oil balancing device for a multi-unit cold storage according to claim 2, characterized in that, It further includes a first ball valve (5) and a second ball valve (6). Both the first ball valve (5) and the second ball valve (6) are connected to the oil return pipeline (2). The first ball valve (5) is located between the one-way check valve (4) and the oil supply solenoid valve (3), and the oil supply solenoid valve (3) is located between the first ball valve (5) and the second ball valve (6).

4. A refrigerant oil balancing device for a multi-unit cold storage according to claim 1, characterized in that, The inner wall of the oil return pipeline (2) is coated with an epoxy resin layer.

5. The refrigerant oil balancing device for a multi-unit cold storage according to claim 1, characterized in that, A liquid flow direction mark (9) is provided on the oil return pipeline (2).

6. The refrigerant oil balancing device for a multi-unit cold storage according to claim 1, characterized in that, It further includes a frame (1) and a limit component (7). Both the limit component (7) and the oil return pipeline (2) are connected to the frame (1), and the limit component (7) is used to limit the oil return pipeline (2).

7. The refrigerant oil balancing device for a multi-unit cold storage according to claim 6, characterized in that, The limit component (7) includes a first limit block (71) and a second limit block (72). The first limit block (71) and the second limit block (72) are arranged oppositely. The first limit block (71) is connected to the frame (1), and the second limit block (72) is detachably connected to the first limit block (71). After the first limit block (71) and the second limit block (72) are connected to each other, a limit slot (8) for the oil return pipeline (2) to pass through is formed between the first limit block (71) and the second limit block (72).

8. The refrigerant oil balance device for a multi-unit cold storage according to claim 7, characterized in that, The first limit block (71) and the second limit block (72) are detachably connected together by means of fastening with fasteners.

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