Oil return structure of refrigeration equipment

Abstract

The oil return structure of the refrigeration equipment comprises a base, one side of the top of the base is fixedly connected with an oil separation tank, the top of one side of the oil separation tank is provided with an air outlet, the top of the oil separation tank is provided with an input port, the bottom of the input port is communicated with a connecting pipe, and the bottom of the connecting pipe is communicated with an oil return pipe. An oil-gas separation net pipe is arranged at the bottom of the connecting pipe, an oil storage tank is fixedly connected to the other side of the top of the base, the bottom of the oil storage tank is communicated with an oil separation tank, and a metering pump is arranged at the top of the base. The utility model relates to the technical field of refrigeration equipment, and solves the problems that in the prior art, a metering pump for return oil conveying of parallel unit refrigeration equipment is directly connected with the bottom of an oil separation tank, so that gas media are possibly mixed, the lubricating quality of a screw compressor and the metering precision of conveyed lubricating oil are influenced, and the reliability is high. And the operation stability of the screw compressor is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment, in particular to an oil return structure of a refrigeration equipment. Background Art

[0002] Refrigeration equipment refers to equipment mainly used for refrigerating various goods and air conditioning of cabin rooms in hot summer days. It mainly consists of a compressor, an expansion valve, an evaporator, a condenser and accessories, and pipelines. Through the circulation of the refrigerant, the heat of an object and its surrounding is removed to reduce its temperature to the required low temperature environment and maintain a certain low temperature state. It has a wide application in multiple industries such as food, medicine, and chemical industry. After the screw compressor of the refrigeration equipment compresses the refrigeration medium, it is necessary to separate the high-pressure gas from the lubricating oil. In the prior art, the metering pump for oil return transportation of the parallel unit refrigeration equipment is directly connected to the bottom of the oil separation tank, which may cause the mixing of gas medium, affect the lubrication quality of the screw compressor and the metering accuracy of the transported lubricating oil, and affect the operation stability of the screw compressor. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the utility model provides an oil return structure of a refrigeration equipment, which solves the problem that in the prior art, the metering pump for oil return transportation of the parallel unit refrigeration equipment is directly connected to the bottom of the oil separation tank, which may cause the mixing of gas medium, affect the lubrication quality of the screw compressor and the metering accuracy of the transported lubricating oil, and affect the operation stability of the screw compressor.

[0004] To achieve the above object, the utility model is realized through the following technical solutions: An oil return structure of a refrigeration equipment, including a base, one side of the top of the base is fixedly connected with an oil separation tank, an air outlet is arranged at the top of one side of the oil separation tank, an input port is arranged at the top of the oil separation tank, a connecting pipe is communicated with the bottom of the input port, an oil and gas separation network pipe is arranged at the bottom of the connecting pipe, the other side of the top of the base is fixedly connected with an oil storage tank, the bottom of the oil storage tank is communicated with the oil separation tank, a metering pump is arranged on the top of the base, the bottom of the oil storage tank is communicated with the input end of the metering pump, the output end of the metering pump is communicated with a distributor, the output ends of the distributor are equidistantly communicated with oil pipes, a solenoid valve is installed at one end of the oil pipe close to the distributor, the other end of the oil pipe far from the distributor is communicated with a photoelectric oil level sensor, a controller is arranged on one side of the outer wall of the oil separation tank, and the metering pump, the solenoid valve and the photoelectric oil level sensor are all electrically connected with the controller.

[0005] Preferably, an inner metal mesh is arranged inside the oil-gas separation network tube, an outer metal mesh is arranged outside the inner metal mesh, guide vanes are arranged on the sides of the inner metal mesh and the outer metal mesh close to each other, separation umbrellas are fixedly connected equidistantly above the oil-gas separation network tube on the inner wall of the oil separation tank, the separation umbrellas are cooperatively connected with the connecting pipe, and a first oil filter screen is fixedly connected below the oil-gas separation network tube on the inner wall of the oil separation tank.

[0006] Preferably, an oil injection port is arranged on one side of the top of the oil storage tank, an oil discharge port is arranged on one side of the bottom of the oil storage tank, and a second oil filter screen is fixedly connected below the oil injection port on the inner wall of the oil storage tank.

[0007] Preferably, a first pressure transmitter is installed on one side of the top of the oil separation tank, a second pressure transmitter is installed on the top of the oil storage tank, and both the first pressure transmitter and the second pressure transmitter are electrically connected to the controller.

[0008] Preferably, a liquid level switch is installed on the inner wall of the oil storage tank, the liquid level switch is electrically connected to the controller, and a sight glass is arranged on the outer wall of the oil storage tank.

[0009] The utility model provides an oil return structure of a refrigeration device. It has the following beneficial effects: For the oil return structure of the refrigeration device, through the cooperation among the base, the oil separation tank, the air outlet, the input port, the connecting pipe, the oil-gas separation network tube, the oil storage tank, the metering pump, the distributor, the solenoid valve, the photoelectric oil level sensor, the controller and the oil delivery pipe, the lubricating oil after oil-gas separation in the oil separation tank is stored by the oil storage tank, so that the oil delivery pipe at the input end of the metering pump is far away from the oil separation tank, which can avoid high-pressure gas medium from being sucked into the oil delivery pipe during the lubricating oil transportation, thereby ensuring the lubrication quality of the screw compressor and the metering accuracy of the transported lubricating oil, enabling the lubricating oil to stably and continuously supply oil back to the screw compressor, improving the operation stability of the compressor of the refrigeration device, and thus helping to improve the service life of the refrigeration device.

[0010] Through the cooperation among the oil separation tank, the connecting pipe, the oil-gas separation network tube, the inner metal mesh, the outer metal mesh, the guide vanes, the separation umbrellas and the first oil filter screen, through the double filtration of the inner metal mesh and the outer metal mesh, most of the grease in the oil-gas mixture is filtered out, and the separated gas medium is further subjected to oil-gas separation treatment by the two separation umbrellas, which can ensure the thorough separation and efficient treatment of the oil and gas, and thus improve the efficiency and stability of the oil-gas separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the utility model;

[0012] Figure 2 is a schematic structural diagram of the oil separation tank, the separation umbrellas and the first oil filter screen in the utility model;

[0013] Figure 3 This is a schematic structural diagram of the inner metal mesh, outer metal mesh and guide vane in the present utility model;

[0014] Figure 4 is Figure 1 a partial enlarged view of area A in

[0015] In the figure: 1. Base; 2. Oil separation tank; 3. Air outlet; 4. Input port; 5. Connecting pipe; 6. Oil and gas separation network pipe; 7. Oil storage tank; 8. Metering pump; 9. Distributor; 10. Solenoid valve; 11. Photoelectric oil level sensor; 12. Controller; 13. Inner metal mesh; 14. Outer metal mesh; 15. Guide vane; 16. Separation umbrella; 17. First oil filter mesh; 18. Oil injection port; 19. Oil drain port; 20. Second oil filter mesh; 21. First pressure transmitter; 22. Second pressure transmitter; 23. Liquid level switch; 24. Sight glass; 25. Oil pipeline. Specific embodiments

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0017] In the prior art, the metering pump for oil return transportation in a parallel unit refrigeration device is directly connected to the bottom of the oil separation tank, which may cause the mixing of gas media, affecting the lubrication quality of the screw compressor and the metering accuracy of the transported lubricating oil, and affecting the operation stability of the screw compressor.

[0018] In view of this, the present utility model provides an oil return structure for a refrigeration device. Through the cooperation among the base, oil separation tank, air outlet, input port, connecting pipe, oil and gas separation network pipe, oil storage tank, metering pump, distributor, solenoid valve, photoelectric oil level sensor, controller and oil pipeline, the lubricating oil after oil and gas separation in the oil separation tank is stored through the oil storage tank, so that the oil pipeline at the input end of the metering pump is far away from the oil separation tank, avoiding the inhalation of high-pressure gas media into the oil pipeline during the transportation of lubricating oil, thereby ensuring the lubrication quality of the screw compressor and the metering accuracy of the transported lubricating oil, enabling the lubricating oil to be stably and continuously supplied to the screw compressor, and improving the operation stability of the compressor of the refrigeration device.

[0019] Persons skilled in the art shall connect all the electrical components in this case to their adapted power supplies through wires, and appropriate controllers and encoders shall be selected according to the actual situation to meet the control requirements. For the specific connection and control sequence, reference shall be made to the working principle below, and the electrical connection shall be completed according to the sequence of the electrical components working one after another. The detailed connection means are well-known techniques in the art. The following mainly introduces the working principle and process, and no further description of electrical control will be given.

[0020] As Figures 1-4 can be seen, an oil return structure of a refrigeration device includes a base 1, which is used to fix the oil-gas separation module. One side of the top of the base 1 is fixedly connected with an oil separation tank 2. The inside of the oil separation tank 2 is provided with relevant components for oil-gas separation. One side of the top of the oil separation tank 2 is provided with an air outlet 3. The top of the oil separation tank 2 is provided with an input port 4. The bottom of the input port 4 is communicated with a connecting pipe 5. The bottom of the connecting pipe 5 is provided with an oil-gas separation network pipe 6. The other side of the top of the base 1 is fixedly connected with an oil storage tank 7. The bottom of the oil storage tank 7 is communicated with the oil separation tank 2. A metering pump 8 is arranged on the top of the base 1. The bottom of the oil storage tank 7 is communicated with the input end of the metering pump 8. The output end of the metering pump 8 is communicated with a distributor 9. The output end of the distributor 9 is communicated with the oil storage cavities of each compressor of the refrigeration device. According to the usage of the compressor, the pipeline at the output end of the distributor 9 can be controlled to be switched on or off, so as to control the oil supply situation of the oil storage cavities of the compressors in the refrigeration device. The output end of the distributor 9 is equidistantly communicated with oil pipelines 25. One end of the oil pipeline 25 close to the distributor 9 is provided with an electromagnetic valve 10. The other end of the oil pipeline 25 far from the distributor 9 is communicated with a photoelectric oil level sensor 11. The photoelectric oil level sensor 11 is communicated with the oil storage cavity of the compressor, and can convey lubricating grease to the oil storage cavity of the compressor, and at the same time, monitor the oil level in the oil storage cavity of the compressor in real time, can accurately and quickly detect the height of the oil level, and transmit the monitoring signal to the controller 12 in real time, providing key data support for the stable operation of the compressor. A controller 12 is arranged on one side of the outer wall of the oil separation tank 2. The metering pump 8, the electromagnetic valve 10 and the photoelectric oil level sensor 11 are all electrically connected to the controller 12;

[0021] In the specific implementation process, it is particularly worth noting that the base 1 is used to fix the oil-gas separation module. The interior of the oil separation tank 2 is provided with relevant components for oil-gas separation. Through the cooperation among the oil separation tank 2, the air outlet 3, the input port 4, the connecting pipe 5, and the oil-gas separation network pipe 6, the compressed mixture is input into the interior of the oil separation tank 2 through the input port 4, and the compressed gas medium and grease are separated through the oil-gas separation network pipe 6, so that the grease accumulates at the bottom of the oil separation tank 2, and the high-pressure gas medium is discharged from the oil separation tank 2 through the air outlet 3 for refrigeration cycle, realizing the oil-gas separation of the mixture of the gas medium and grease. Through the cooperation between the oil separation tank 2 and the oil storage tank 7, the oil storage tank 7 is connected to the bottom of the oil separation tank 2, so that the separated grease in the oil separation tank 2 can smoothly flow into the oil storage tank 7, facilitating the subsequent oil return cycle. The output end of the distributor 9 is connected to the oil storage cavities of the compressors of the refrigeration equipment. According to the usage conditions of the compressors, the pipeline at the output end of the distributor 9 can be controlled to be switched on and off, thereby controlling the oil supply situation of the oil storage cavities of the compressors in the refrigeration equipment. Through the cooperation among the oil storage tank 7, the metering pump 8, and the distributor 9, the grease in the oil storage tank 7 is pumped out by the metering pump 8 and conveyed to the distributor 9. By adjusting the distributor 9, it is ensured that the grease can be accurately distributed into the oil storage cavities of each compressor to meet the requirements of its normal operation. The photoelectric oil level sensor 11 is connected to the oil storage cavity of the compressor, which can convey the lubricating grease to the oil storage cavity of the compressor, and at the same time, the oil level in the oil storage cavity of the compressor is monitored in real time, accurately and quickly detecting the height of the oil level and transmitting the monitoring signal to the controller 12 in real time, providing key data support for the stable operation of the compressor. Through the cooperation among the oil storage tank 7, the metering pump 8, the distributor 9, the solenoid valve 10, the photoelectric oil level sensor 11, the controller 12, and the oil pipeline 25, the oil level in the oil storage cavity of the compressor is monitored in real time by the photoelectric oil level sensor 11 and the monitoring signal is transmitted to the controller 12 in real time. When the oil level in the oil storage cavity of the compressor is too low, the controller 12 automatically controls the metering pump 8 and the corresponding solenoid valve 10 to open the oil pipeline 25 corresponding to the compressor, so that the lubricating oil in the oil storage tank 7 is conveyed to the corresponding oil storage cavity of the compressor through the oil pipeline 25, thus realizing the automatic replenishment of the oil level in the oil storage cavity of the compressor, and after the oil level reaches a certain height, the controller 12 automatically stops the conveyance of the lubricating oil. Through the cooperation among the base 1, the oil separation tank 2, the air outlet 3, the input port 4, the connecting pipe 5, the oil-gas separation network pipe 6, the oil storage tank 7, the metering pump 8, the distributor 9, the solenoid valve 10, the photoelectric oil level sensor 11, the controller 12, and the oil pipeline 25, the oil-gas separation component in the oil separation tank 2 separates the mixture of the gas medium and grease, so that the separated grease in the oil separation tank 2 can smoothly flow into the oil storage tank 7, and the oil levels in the oil storage cavities of each compressor are monitored in real time according to each photoelectric oil level sensor 11.And the monitoring signal is transmitted to the controller 12 in real time. Through the automatic control of the metering pump 8 and the solenoid valve 10 by the controller 12, the automatic replenishment of the oil level in the oil storage cavity of the compressor is realized. The lubricating oil after oil-gas separation in the oil separation tank 2 is stored through the oil storage tank 7. The oil delivery pipeline at the input end of the metering pump 8 is far away from the oil separation tank 2 to avoid the high-pressure gas medium being sucked into the oil delivery pipeline during the lubricating oil transportation, so as to ensure the lubrication quality of the screw compressor and the metering accuracy of the transported lubricating oil, make the lubricating oil stably and continuously supplied to the screw compressor, and improve the operation stability of the compressor of the refrigeration equipment. The specific models of the metering pump 8, the solenoid valve 10, the photoelectric oil level sensor 11 and the controller 12 are not limited, as long as they meet the use requirements;

[0022] Further, an inner metal mesh 13 is arranged inside the oil-gas separation network tube 6, an outer metal mesh 14 is arranged outside the inner metal mesh 13, a guide vane 15 is arranged on the side where the inner metal mesh 13 and the outer metal mesh 14 are close to each other. The inner wall of the oil separation tank 2 is equidistantly fixedly connected with separation umbrellas 16 above the oil-gas separation network tube 6. The separation umbrellas 16 are cooperatively connected with the connecting pipe 5. The inner wall of the oil separation tank 2 is fixedly connected with a first oil filter screen 17 below the oil-gas separation network tube 6. The first oil filter screen 17 is used to filter the filtered lubricating oil to ensure the purity of the lubricating oil participating in the cycle and improve the service life of the compressor of the refrigeration equipment;

[0023] In the specific implementation process, it is particularly pointed out that through the cooperation between the connecting pipe 5, the oil-gas separation network tube 6, the inner metal mesh 13, the outer metal mesh 14 and the guide vane 15, the oil-gas mixture is transported to the inside of the oil-gas separation network tube 6 through the connecting pipe 5. Through the double filtration of the inner metal mesh 13 and the outer metal mesh 14, most of the grease in the oil-gas mixture is filtered out and slides along the surfaces of the inner metal mesh 13, the outer metal mesh 14 and the guide vane 15 to the bottom of the inner cavity of the oil separation tank 2. The separated gas medium enters the top of the inner cavity of the oil separation tank 2. Through the cooperation between the oil separation tank 2, the connecting pipe 5 and the separation umbrellas 16, by arranging two separation umbrellas 16 at the top of the oil-gas separation network tube 6, when the separated gas medium is transported to the air outlet 3, further oil-gas separation treatment is carried out, thereby improving the oil-gas separation effect. The first oil filter screen 17 is used to filter the filtered lubricating oil to ensure the purity of the lubricating oil participating in the cycle and improve the service life of the compressor of the refrigeration equipment. Through the cooperation between the oil separation tank 2, the connecting pipe 5, the oil-gas separation network tube 6, the inner metal mesh 13, the outer metal mesh 14, the guide vane 15, the separation umbrellas 16 and the first oil filter screen 17, through the double filtration of the inner metal mesh 13 and the outer metal mesh 14 on the oil-gas mixture, most of the grease in the oil-gas mixture is filtered out, and through the two separation umbrellas 16, further oil-gas separation treatment is carried out on the separated gas medium, ensuring the thorough separation and efficient treatment of the oil and gas, and improving the efficiency and stability of the oil-gas separation;

[0024] Further, an oil filling port 18 is provided on one side of the top of the oil storage tank 7, and an oil discharge port 19 is provided on one side of the bottom of the oil storage tank 7. A second oil filter screen 20 is fixedly connected to the inner wall of the oil storage tank 7 below the oil filling port 18. The second oil filter screen 20 is used to filter the newly added lubricating oil to prevent impurities and particulate matters from entering the interior of the oil storage tank 7;

[0025] In the specific implementation process, it is particularly worth noting that through the cooperation among the oil storage tank 7, the oil filling port 18, and the oil discharge port 19, the convenience of filling the oil storage tank 7 is improved through the oil filling port 18, and the lubricating oil in the oil storage tank 7 and the oil separation tank 2 can be discharged through the oil discharge port 19, so as to facilitate cleaning and replacement, ensure the purity of the oil quality inside the oil storage tank 7, and ensure the stable operation of the refrigeration equipment. The second oil filter screen 20 is used to filter the newly added lubricating oil to prevent impurities and particulate matters from entering the interior of the oil storage tank 7;

[0026] Further, a first pressure transmitter 21 is installed on one side of the top of the oil separation tank 2, and a second pressure transmitter 22 is installed on the top of the oil storage tank 7. Both the first pressure transmitter 21 and the second pressure transmitter 22 are electrically connected to the controller 12;

[0027] In the specific implementation process, it is particularly worth noting that through the cooperation among the oil separation tank 2, the oil storage tank 7, the controller 12, the first pressure transmitter 21, and the second pressure transmitter 22, the pressures in the oil separation tank 2 and the oil storage tank 7 are sensed respectively by the first pressure transmitter 21 and the second pressure transmitter 22, and the sensed signals are transmitted to the controller 12 in real time, which is convenient for the controller 12 to monitor the operating state of the system and automatically adjust the working state of the system to reduce or eliminate the possible hazards caused by abnormal pressure. The specific models of the first pressure transmitter 21 and the second pressure transmitter 22 are not limited, as long as they meet the use requirements;

[0028] Further, a liquid level switch 23 is installed on the inner wall of the oil storage tank 7. The liquid level switch 23 is used to monitor the oil level of the lubricating oil in the oil storage tank 7. The liquid level switch 23 is electrically connected to the controller 12. A sight port 24 is provided on the outer wall of the oil storage tank 7. The sight port 24 is convenient for the staff to observe the color and fluidity of the lubricating oil in the oil storage tank 7 and make timely adjustments and replacements according to the use conditions of the lubricating oil;

[0029] In the specific implementation process, it is particularly worth noting that the liquid level switch 23 is used to monitor the oil level of the lubricating oil in the storage oil tank 7. When the oil level of the lubricating oil is lower than a certain height, the liquid level switch 23 is triggered. After receiving the trigger signal of the liquid level switch 23, the controller 12 reminds the staff to replenish the lubricating oil in the storage oil tank 7 in time. The sight glass 24 facilitates the staff to observe the color and fluidity of the lubricating oil in the storage oil tank 7 and make timely adjustments and replacements according to the usage conditions of the lubricating oil. The specific model of the liquid level switch 23 is not limited, as long as it meets the usage requirements.

[0030] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil return structure of a refrigeration device, comprising a base (1), characterized in that: An oil separation tank (2) is fixedly connected to one side of the top of the base (1), an air outlet (3) is provided on one side of the top of the oil separation tank (2), an input port (4) is provided on the top of the oil separation tank (2), a connecting pipe (5) is connected to the bottom of the input port (4), an oil-gas separation network pipe (6) is provided on the bottom of the connecting pipe (5), an oil storage tank (7) is fixedly connected to the other side of the top of the base (1), the bottom of the oil storage tank (7) is connected to the oil separation tank (2), a metering pump (8) is provided on the top of the base (1), and the bottom of the oil storage tank (7) is connected to the oil separation tank (2). The oil separation tank (2) is connected to an input end of the metering pump (8), the output end of the metering pump (8) is connected to a distributor (9), the output end of the distributor (9) is equidistantly connected to an oil delivery pipe (25), an end of the oil delivery pipe (25) close to the distributor (9) is installed with a solenoid valve (10), and an end of the oil delivery pipe (25) away from the distributor (9) is connected to a photoelectric oil level sensor (11), a controller (12) is provided on one side of the outer wall of the oil separation tank (2), and the metering pump (8), the solenoid valve (10) and the photoelectric oil level sensor (11) are all electrically connected to the controller (12).

2. The oil return structure of a refrigeration device according to claim 1, characterized in that: An inner metal mesh (13) is arranged inside the oil-gas separation network pipe (6), an outer metal mesh (14) is arranged outside the inner metal mesh (13), a guide vane (15) is arranged on the side where the inner metal mesh (13) and the outer metal mesh (14) are close to each other, a separation umbrella (16) is fixedly connected to the inner wall of the oil separation tank (2) at an equal distance above the oil-gas separation network pipe (6), the separation umbrella (16) is connected to the connecting pipe (5), and a first oil filter net (17) is fixedly connected to the inner wall of the oil separation tank (2) at a position below the oil-gas separation network pipe (6).

3. The oil return structure of a refrigeration equipment according to claim 1, characterized in that: An oil filling port (18) is provided on one side of the top of the oil storage tank (7), an oil discharge port (19) is provided on one side of the bottom of the oil storage tank (7), and a second oil filter (20) is fixedly connected to the inner wall of the oil storage tank (7) below the oil filling port (18).

4. The oil return structure of a refrigeration device according to claim 1, characterized in that: A first pressure transmitter (21) is installed on one side of the top of the oil separation tank (2), and a second pressure transmitter (22) is installed on the top of the oil storage tank (7); the first pressure transmitter (21) and the second pressure transmitter (22) are both electrically connected to the controller (12).

5. The oil return structure of a refrigeration device according to claim 1, characterized in that: A liquid level switch (23) is installed on the inner wall of the oil storage tank (7), and the liquid level switch (23) is electrically connected to the controller (12). A viewport (24) is provided on the outer wall of the oil storage tank (7).

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