Refrigeration oil purification device

Abstract

The utility model discloses a refrigeration oil purification device which comprises an oil storage tank, a delivery pump, a vacuumizing device, a first multi-stage filtering module and a controller, a suction inlet of the delivery pump is located on the bottom layer of the oil storage tank, and an oil outlet of the delivery pump is communicated with the upper layer of the oil storage tank and / or an inlet of a unit oil tank through the first multi-stage filtering module. The vacuumizing device is arranged at an extraction opening in the upper layer of the oil storage tank, the controller is electrically connected with the conveying pump and the vacuumizing device, and the controller controls opening and closing of the conveying pump and the vacuumizing device. According to the utility model, refrigeration oil at the bottom layer is extracted to the upper layer, and the first multi-stage filtering module and the vacuumizing device are designed in a matched manner to improve the filtering level, so that the refrigeration oil product can be purified on line when the oil is not injected.

Description

Technical Field

[0001] The utility model relates to the technical field of recycling devices, in particular to a refrigerating oil purification device. Background Art

[0002] Before leaving the factory, it is necessary to fill the unit with refrigerating oil for testing, and after the test is completed, the refrigerating oil recovery treatment needs to be completed. At present, the centrifugal refrigerating oil is filled by means of air inflation and pressurization. After the unit test is completed, the refrigerating oil is recovered to the refrigerating oil tank and recycled until it cannot be used and then scrapped.

[0003] A refrigerating oil recovery device with the patent number CN104791222B has an oil filter, an electric heater and a vacuum pumping device to purify the refrigerating oil. However, this patent extracts the refrigerating oil from the upper layer of the storage tank, and it only purifies the refrigerating oil during oil filling. It only relies on one oil filter to purify the refrigerating oil, and the purification is inefficient and incomplete. Summary of the Utility Model

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a refrigerating oil purification device, which solves the problems that the refrigerating oil extracted from the upper layer of the storage tank only purifies the refrigerating oil during oil filling at present, and only one oil filter is used for incomplete purification.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a refrigerating oil purification device, including a storage tank, a delivery pump, a vacuum pumping device, a first multi-stage filtering module and a controller. The suction port of the delivery pump is located at the bottom layer of the storage tank, and the oil outlet of the delivery pump is connected to the upper layer of the storage tank and / or the inlet of the unit oil tank through the first multi-stage filtering module. The vacuum pumping device is arranged at the air extraction port on the upper layer of the storage tank. The controller is electrically connected to the delivery pump and the vacuum pumping device respectively, and the controller controls the opening and closing of the delivery pump and the vacuum pumping device.

[0006] As a further improvement of the utility model: the delivery pump is a gear pump. Further, the gear pump is arranged inside the storage tank.

[0007] The vacuum pumping device is a vacuum pump, and a high liquid level switch and a low liquid level switch are arranged in the storage tank.

[0008] As a further improvement of the utility model: a flow meter is arranged between the first multi-stage filtering module and the inlet of the unit oil tank, and the flow meter is connected to the controller.

[0009] As a further improvement of the utility model: the first multi-stage filtering module is provided with at least one oil filter and at least one drying filter. The inlet of the oil filter is connected to the oil outlet of the delivery pump, and the outlet of the oil filter is connected to the drying filter.

[0010] As a further improvement of the present utility model: the air extraction port is arranged away from the oil inlet of the oil storage tank, and a gas-liquid separator is installed at the air extraction port.

[0011] As a further improvement of the present utility model: the upper layer of the oil storage tank is provided with a first oil inlet, a first valve assembly is arranged between the first oil inlet and the first multi-stage filtration module, and the controller is electrically connected to the first valve assembly.

[0012] Furthermore, the first valve assembly is provided with an electromagnetic valve and a ball valve.

[0013] As a further improvement of the present utility model: a second valve assembly is arranged between the first multi-stage filtration module and the inlet of the unit oil tank, and the controller is electrically connected to the second valve assembly.

[0014] Furthermore, the second valve assembly is provided with an electromagnetic valve and a globe valve.

[0015] As a further improvement of the present utility model: at least one of a water content detector, a viscosity sensor, a temperature sensor, and an electric heater is arranged in the oil storage tank.

[0016] As a further improvement of the present utility model: the upper layer of the oil storage tank is provided with a second oil inlet, the second oil inlet is connected to the outlet of the unit oil tank, a third valve assembly is arranged between the second oil inlet and the outlet of the unit oil tank, and the controller is electrically connected to the third valve assembly.

[0017] Furthermore, the third valve assembly is provided with at least one globe valve.

[0018] As a further improvement of the present utility model: at least one oil filter and / or at least one drying filter is arranged between the second oil inlet and the outlet of the unit oil tank.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] In the present utility model, the suction port of the transfer pump is arranged at the bottom layer of the oil storage tank, the oil outlet of the transfer pump is communicated with the upper layer of the oil storage tank and / or the unit oil tank via the first multi-stage filtration module, and in cooperation with the first multi-stage filtration module at the oil outlet of the transfer pump and the vacuum pumping device at the air extraction port of the oil storage tank, the purification level and efficiency are improved, the purification is thorough, the quality of the refrigeration oil is guaranteed, and the refrigeration oil can be purified online when no oil is injected. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a refrigeration oil purification device according to an embodiment of the present utility model.

[0022] Reference Signs:

[0023] 1. Oil storage tank, 101. First oil inlet, 102. Second oil inlet, 2. Transfer pump, 3. First multi-stage filtration module, 31. Oil filter, 32. Dry filter, 4. Vacuum pumping device, 5. Unit oil tank, 6. Flowmeter, 7. Gas-liquid separator, 8. First valve assembly, 9. Negative pressure sensor, 10. Second valve assembly, 11. Third valve assembly, 12. Water content detector, 13. Viscosity sensor, 14. Temperature sensor, 15. Electric heater, 16. Liquid level gauge, 17. High liquid level switch, 18. Low liquid level switch. Detailed implementation manners

[0024] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the specific embodiments and corresponding drawings of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" 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; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0026] To solve the technical problems in the prior art, the present utility model will be further described below in conjunction with the drawings and embodiments:

[0027] As Figure 1 shown, an embodiment of the present utility model discloses a refrigeration oil purification device, which includes an oil storage tank 1, a transfer pump 2, a first multi-stage filtration module 3, a vacuum pumping device 4 and a controller. The suction port of the transfer pump 2 is located at the bottom layer of the oil storage tank 1, and the oil outlet of the transfer pump 2 is connected to the upper layer of the oil storage tank 1 and / or the inlet of the unit oil tank 5 through the first multi-stage filtration module 3. A vacuum pumping device 4 is provided at the upper end of the oil storage tank 1. The controller is electrically connected to the transfer pump 2 and the vacuum pumping device 4 respectively, and the controller controls the opening and closing of the transfer pump 2 and the vacuum pumping device 4.

[0028] Among them, the controller in this embodiment can adopt a PLC controller. The fact that the oil outlet of the transfer pump 2 is connected to the upper layer of the oil storage tank 1 and / or the inlet of the unit oil tank 5 through the first multi-stage filtration module 3 has three meanings:

[0029] First, when the oil outlet of the transfer pump 2 is connected to the upper layer of the storage tank 1 through the first multi-stage filtration module 3, at this time, the oil outlet of the transfer pump 2 is communicated with the upper layer of the storage tank 1 through the first multi-stage filtration module 3, and the oil outlet of the transfer pump 2 is not communicated with the inlet of the unit oil tank 5 after passing through the first multi-stage filtration module 3. The storage tank 1, the transfer pump 2, and the first multi-stage filtration module 3 form a refrigeration oil circulation loop, and no oil injection operation is performed on the unit oil tank 5, and the online purification treatment of the refrigeration oil can be realized independently.

[0030] Second, when the oil outlet of the transfer pump 2 is connected to the inlet of the unit oil tank 5 through the first multi-stage filtration module 3, at this time, the oil outlet of the transfer pump 2 is not communicated with the upper layer of the storage tank 1 after passing through the first multi-stage filtration module 3, but is communicated with the unit oil tank 5. The storage tank 1, the transfer pump 2, the first multi-stage filtration module 3, and the unit oil tank 5 form a separate refrigeration oil injection pipeline. Whether the refrigeration oil has passed through the online purification treatment process or not, the refrigeration oil can still be purified through the first multi-stage filtration module 3 and then injected into the unit oil tank 5.

[0031] Third, when the oil outlet of the transfer pump 2 is connected to the upper layer of the storage tank 1 and the inlet of the unit oil tank 5 through the first multi-stage filtration module 3, it indicates that after the refrigeration oil flows through the first multi-stage filtration module 3 from the oil outlet of the transfer pump 2, it flows into the upper layer of the storage tank 1 and the inlet of the unit oil tank 5 respectively. While injecting oil into the unit oil tank 5, the online purification of the refrigeration oil can be carried out at the same time, that is, after the refrigeration oil is purified through the first multi-stage filtration module 3, a part of it flows back to the upper layer of the storage tank 1 for circulating reflux purification, and the other part is injected into the unit oil tank 5.

[0032] In this embodiment, the transfer pump 2 extracts the refrigeration oil from the bottom layer of the storage tank 1, purifies the refrigeration oil through multi-stage filtration, and then transports it to the upper layer of the storage tank 1. When the refrigeration oil at the bottom directly returns to the upper layer of the storage tank 1 through the transfer pump 2, the dissolved refrigerant and water do not need to pass through the high-viscosity oil layer to enter the upper space and be removed by the vacuum device 4, which is easy to remove the refrigerant and water, and the purification is efficient and thorough. It ensures that the refrigeration oil can be purified even when the unit oil tank 5 is not filled with oil, or the refrigeration oil purified through the multi-stage subcooling module is transported to the unit oil tank 5 by the transfer pump 2, and the transfer pump 2 can ensure a large flow rate of the refrigeration oil.

[0033] By designing the first multi-stage filtration module 3 at the oil outlet of the transfer pump 2, impurities and water in the refrigeration oil are removed step by step, and the purification is efficient and thorough, ensuring the quality of the refrigeration oil entering the unit oil tank 5.

[0034] In some embodiments, the transfer pump 2 is a gear pump. Compared with the gas-filled pressurized oil injection method, the gear pump is adopted in this embodiment, which increases the back pressure that can be overcome and can increase the refrigeration oil filling speed.

[0035] After being processed by the first multi-stage filtration module 3 and the vacuum pumping device 4, in other embodiments, an electric heating module is further added, which can purify the refrigeration oil even when no oil is injected, and can thoroughly purify the refrigeration oil at any time to ensure the qualified quality of the refrigeration oil.

[0036] In some embodiments, a flow meter 6 is provided between the inlet of the first multi-stage filtration module 3 and the inlet of the unit oil tank 5, and the flow meter 6 is connected to the controller.

[0037] When the oil injection operation is carried out, the transfer pump 2 / gear pump is started, the first multi-stage filtration module 3 is communicated with the inlet of the unit oil tank 5, and the controller controls the filling amount of the refrigeration oil through the flow meter 6 to realize automatic filling of the refrigeration oil. There is no need to determine the oil filling amount by manually reading the difference in the front and back scales of the liquid level gauge 16. The oil filling efficiency is high, the accuracy is high, and the labor cost is reduced.

[0038] In some embodiments, the first multi-stage filtration module 3 is provided with at least one oil filter 31 and at least one drying filter 32. The inlet of the oil filter 31 is connected to the outlet of the transfer pump 2, and the outlet of the oil filter 31 is connected to the drying filter 32.

[0039] Preferably, two oil filters 31 and one drying filter 32 are provided. After the gear pump extracts the refrigeration oil from the bottom of the storage tank 1, it undergoes three-stage filtration to gradually filter out impurities and water in the refrigeration oil, and transports the refrigeration oil to the upper layer of the storage tank 1 or is serially transported to the unit oil tank 5 through the flow meter 6. The gear pump can overcome a large back pressure and can ensure a large flow rate of the refrigeration oil.

[0040] The outlet at the lower layer of the storage tank 1 is connected to the suction port of the transfer pump 2. The first multi-stage filtration module 3 can change the number of oil filters 31 and the number of drying filters 32, and change the filtration level to meet the requirements of different unit oil tanks 5 for the quality of the refrigeration oil and the filtration of the refrigeration oil.

[0041] In some embodiments, the air extraction port is arranged away from the oil inlet of the storage tank 1, and a gas-liquid separator 7 is installed at the air extraction port.

[0042] Different from the prior art in which the vacuum pumping device 4 is arranged close to the oil inlet, during the process of workers injecting oil through the oil inlet, the refrigeration oil will splash, which will cause the problem of liquid entrainment in the vacuum pumping. In this embodiment, a vacuum pumping device is designed above the storage tank 1 away from the oil inlet, and a gas-liquid separator 7 is configured at the air extraction port to remove the refrigerant and water dissolved in the refrigeration oil, prevent the influence of cavitation effect and abnormal oil pressure difference, and ensure that the refrigeration oil does not enter the vacuum pumping device 4. More preferably, the vacuum pumping device 4 uses a vacuum pump.

[0043] An electromagnetic valve and a stop valve are provided between the air extraction port of the storage tank 1 and the vacuum pump.

[0044] In some embodiments, there is no liquid level detection device designed for the prior art. When the liquid level of the refrigeration oil is too low, the oil pump has no oil to pump. When the liquid level is too high, there is liquid carried during vacuum pumping. A high liquid level switch 17 is installed at a first set height in the storage tank 1, and a low liquid level switch 18 is provided at a second set height in the storage tank 1. The high liquid level switch 17 and the low liquid level switch 18 are respectively connected to the controller. The height of the refrigeration oil in the storage tank 1 is detected through the high liquid level switch 17 and the low liquid level switch 18, avoiding no oil to pump at low liquid level and oil carried during vacuum pumping at high liquid level.

[0045] In some embodiments, a first oil inlet 101 is provided on the upper layer of the storage tank 1. There is an oil return pipeline between the first oil inlet 101 and the first multi-stage filtration module 3. A first valve assembly 8 is provided on the oil return pipeline. The first valve assembly 8 is electrically connected to the controller. The controller controls the opening and closing of the first valve assembly 8, thereby realizing the on-off of the oil return pipeline and the conduction and disconnection of the refrigeration oil circulation loop formed by the storage tank 1, the delivery pump 2, and the first multi-stage filtration module 3.

[0046] Preferably, a ball valve is provided between the first multi-stage filtration module 3 and the outlet of the delivery pump 2.

[0047] Preferably, a ball valve and a solenoid valve are provided between the first multi-stage filtration module 3 and the first oil inlet 101 on the upper layer of the storage tank 1. The ball valve and the solenoid valve are the first valve assembly 8.

[0048] In some embodiments, a negative pressure sensor 9 is provided above the storage tank 1. The negative pressure sensor 9 is electrically connected to the controller to detect the vacuum degree in the storage tank 1.

[0049] In some embodiments, an oil injection pipeline is provided between the first multi-stage filtration module 3 and the inlet of the unit oil tank 5. A second valve assembly 10 is provided on the oil injection pipeline. The second valve assembly 10 is electrically connected to the controller. The controller automatically controls the opening and closing of the second valve assembly 10 to realize the automatic oil injection operation of the unit oil tank 5 and cooperate with the flowmeter 6 to realize the quantitative injection of the set oil volume into the unit oil tank 5.

[0050] Preferably, a solenoid valve and a stop valve are provided between the first multi-stage filtration module 3 and the unit oil tank 5. The solenoid valve and the stop valve are the second valve assembly 10.

[0051] Further, a second oil inlet 102 is provided on the upper layer of the storage tank 1. The second oil inlet 102 is connected to the outlet of the unit oil tank 5. A third valve assembly 11 is provided between the second oil inlet 102 and the outlet of the unit oil tank 5. The third valve assembly 11 is electrically connected to the controller. The controller controls the opening and closing of the third valve assembly 11.

[0052] The oil storage tank 1, the transfer pump 2, the first multi-stage filtration module 3, and the unit oil tank 5 form a refrigerant oil recovery circuit. Before oil injection into the unit, the third valve assembly 11 is closed. After the unit test is completed, the refrigerant oil recovery process is executed. The third valve assembly 11 is opened, and the refrigerant oil in the unit oil tank 5 returns to the second oil inlet 102 at the upper layer of the oil storage tank 1. There is no need for manual recovery of the refrigerant oil in the unit oil tank 5 and pouring it into the oil storage tank 1. Moreover, the refrigerant and water dissolved in the refrigerant oil can directly reach the vacuum condition without passing through the oil layer, and the refrigerant and water are easily removed.

[0053] In actual operation, when no oil injection is carried out, the controller controls the first valve assembly 8 to open to purify the refrigerant oil in the oil storage tank 1 online. That is, the refrigerant oil is transported by the transfer pump 2 to the first multi-stage filtration module 3 for purification and then flows back to the first oil inlet 101 at the upper layer of the oil storage tank 1. After detecting that the quality of the refrigerant oil in the oil storage tank 1 meets the requirements, the controller controls the first valve assembly 8 to close. When oil injection is carried out, the controller controls the second valve assembly 10 to open, and the first valve assembly 8 can be opened or closed. The refrigerant oil at the bottom layer of the oil storage tank 1 flows out through the oil outlet of the transfer pump 2, is purified by the first multi-stage filtration module 3, and then injected into the unit oil tank 5. After the oil injection amount in the unit oil tank 5 meets the set content, the controller controls the transfer pump 2 and the second valve assembly 10 to close, stopping the continuous pumping of refrigerant oil into the unit oil tank 5. After the test is completed, the third valve assembly 11 is controlled to open, and the refrigerant oil flows back into the oil storage tank 1 through the outlet of the unit oil tank 5.

[0054] Among them, the vacuum pumping device 4 is arranged away from the first oil inlet 101 and the second oil inlet 102. The oil inlet of the oil storage tank 1 can be provided with the first oil inlet 101 and the second oil inlet 102, or the first oil inlet 101 and the second oil inlet 102 can be combined into one, that is, the outlet of the unit oil tank 5 is connected to the oil inlet of the oil storage tank 1, and the on-off of the pipeline between the outlet of the unit oil tank 5 and the oil inlet of the oil storage tank 1 is controlled by the third valve assembly 11. At the same time, the outlet of the first multi-stage filtration module 3 is connected to the oil inlet of the oil storage tank 1. When purifying the refrigerant oil online, the on-off of the pipeline between the first multi-stage filtration module 3 and the oil inlet of the oil storage tank 1 is realized through the first valve assembly 8.

[0055] In some embodiments, at least one of a water content detector 12, a viscosity sensor 13, a temperature sensor 14, and an electric heater 15 is provided in the oil storage tank 1. The water content detector 12, the viscosity sensor 13, the temperature sensor 14, and the electric heater 15 are electrically connected to the controller respectively.

[0056] In a specific example, by designing a temperature sensor 14, a water content detector 12, and a viscosity detection sensor on the storage oil tank 1, the temperature, water content, and kinematic viscosity of the refrigeration oil are monitored in real time and online. The timeliness is good, enabling the abnormal condition of the refrigeration oil to be detected in a timely manner. The test results are more accurate and stable, avoiding the possibility of secondary pollution in the way of sending the refrigeration oil to the laboratory for detection, which may affect the measurement results.

[0057] Meanwhile, by controlling the controller to turn on the electric heater 15, the refrigeration oil is heated, making it easy to remove the refrigerant and moisture dissolved in the refrigeration oil.

[0058] In some embodiments, a second multi-stage filtration module is further provided between the second oil inlet 102 of the storage oil tank 1 and the outlet of the unit oil tank 5. The second multi-stage filtration module purifies the refrigeration oil flowing out of the unit oil tank 5, and the refrigerant and water dissolved in the returned refrigeration oil do not need to pass through the oil layer and then contact the vacuum condition, making it easy to remove the refrigerant and water.

[0059] The second multi-stage filtration module is provided with at least one oil filter 31 and / or at least one drying filter 32. The refrigeration oil in the unit oil tank 5 returns to the second oil inlet 102 on the upper layer of the storage oil tank 1 through the oil filter 31 and the drying filter 32, purifying the refrigeration oil flowing back from the unit oil tank 5.

[0060] Preferably, at least one stop valve is provided between the outlet of the unit oil tank 5 and the second oil inlet 102 on the upper layer of the storage oil tank 1. A stop valve is installed between the second multi-stage filtration module and the outlet of the unit oil tank 5, and a stop valve is installed between the second multi-stage filtration module and the second oil inlet 102 on the upper layer of the storage oil tank 1. In addition, the first valve assembly 8, the second valve assembly 10, and the third valve assembly 11 can be adjusted according to the specific situation of the pipeline.

[0061] The number of the oil filter 31 and the drying filter 32 in the second multi-stage filtration module can be changed. For example, adding one or more oil filters 31 / drying filters 32 can increase the filtration level, ensuring the quality of the refrigeration oil in the storage oil tank 1 and also ensuring the quality of the refrigeration oil at the outlet of the delivery pump 2. In this way, the load of the oil filter 31 and the drying filter 32 at the outlet of the delivery pump 2 can be reduced, and even the number of the oil filter 31 and the drying filter 32 at the outlet can be reduced. If only one oil filter 31 is designed at the second oil inlet 102, the water content of the refrigeration oil flowing back from the unit oil tank 5 to the storage oil tank 1 will increase. However, after a period of time, the vacuum device 4 will reduce the moisture content of the refrigeration oil, increasing the load of the drying filter 32 at the outlet of the delivery pump 2 and also increasing the possibility of the water content detector 12 alarming.

[0062] In some embodiments, a liquid level gauge 16 is further provided on one side of the storage oil tank 1 for detecting the height of the refrigeration oil in the storage oil tank 1.

[0063] In some embodiments, the operation design of the refrigerant oil purification device includes:

[0064] After starting up, the controller simultaneously controls the electric heater 15 and the vacuum pump to start until it detects that the temperature of the refrigerant oil and the vacuum degree reach appropriate values, and then controls the electric heater 15 and the vacuum pump to stop working. If no oil injection operation is performed after starting up, the controller controls the gear pump to start and opens the corresponding valves, such as ball valves, the solenoid valve of the first valve assembly 8, and ball valves, so that the refrigerant oil is purified by the first multi-stage filtration module 3 and flows back to the first oil inlet 101 at the upper layer of the storage tank 1 until the water content detector 12 and the viscosity sensor 13 detect that the water content and kinematic viscosity of the refrigerant oil meet the requirements, and then the controller controls the gear pump to stop working.

[0065] After starting the oil injection operation, the controller controls the solenoid valve of the first valve assembly 8 to close, controls the gear pump to start and the second valve assembly 10 to open. The refrigerant oil is purified by the first multi-stage filtration module 3 and then enters the unit oil tank 5. At the same time, the controller obtains the flow data measured by the flow meter 6. After reaching the preset refrigerant oil perfusion volume, the controller controls the gear pump and the corresponding valves to close and stops the oil injection. When the unit test is completed, the refrigerant oil recovery starts. At this time, the controller controls the vacuum pump to start and the third valve assembly 11 to open. The refrigerant oil flows back to the second oil inlet 102 at the upper layer of the storage tank 1 under the action of the negative pressure of the storage tank 1. At this time, it is manually controlled whether the refrigerant oil recovery is completed, and it can be confirmed whether the recovery is completed through the liquid level gauge 16.

[0066] In addition, before the oil injection operation, if it is necessary to increase the temperature of the refrigerant oil, the controller controls the electric heater 15 to start for preheating.

[0067] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present utility model are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0068] In summary, after those of ordinary skill in the art read the documents of the present utility model, all other corresponding transformation schemes made without creative mental labor according to the technical solutions and technical concepts of the present utility model belong to the scope protected by the present utility model.

Claims

1. A refrigeration oil purification device, characterized in that: It includes an oil storage tank, a delivery pump, a vacuum device, a first multi-stage filtering module and a controller. The suction port of the delivery pump is located at the bottom layer of the oil storage tank. The oil outlet of the delivery pump is connected with the upper layer of the oil storage tank and / or the inlet of the unit oil tank through the first multi-stage filtering module. The vacuum device is arranged at the air suction port of the upper layer of the oil storage tank. The controller is electrically connected to the delivery pump and the vacuum device respectively, and the controller controls the opening and closing of the delivery pump and the vacuum device.

2. A refrigeration oil purification device according to claim 1, characterized in that: The delivery pump is a gear pump.

3. A refrigeration oil purification device according to claim 2, characterized in that: A flow meter is provided between the first multi-stage filter module and the inlet of the unit oil tank, and the flow meter is connected to the controller.

4. A refrigeration oil purification device according to claim 3, characterized in that: The first multi-stage filter module is provided with at least one oil filter and at least one drying filter. The inlet of the oil filter is connected to the oil outlet of the delivery pump, and the outlet of the oil filter is connected to the drying filter.

5. A refrigeration oil purification device according to any one of claims 1 to 4, characterized in that: The air extraction port is arranged away from the oil inlet of the oil storage tank, and a gas-liquid separator is installed at the air extraction port.

6. A refrigeration oil purification device according to claim 1, characterized in that: The upper layer of the oil storage tank is provided with a first oil inlet, a first valve component is provided between the first oil inlet and the first multi-stage filtering module, and the controller is electrically connected to the first valve component.

7. A refrigeration oil purification device according to claim 1, characterized in that: A second valve component is provided between the first multi-stage filter module and the inlet of the unit oil tank, and the controller is electrically connected to the second valve component.

8. A refrigeration oil purification device according to any one of claims 1 to 4, characterized in that: The oil storage tank is provided with at least one of a water content detector, a viscosity sensor, a temperature sensor and an electric heater.

9. A refrigeration oil purification device according to claim 1, characterized in that: The upper layer of the oil storage tank is provided with a second oil inlet, the second oil inlet is connected to the outlet of the unit oil tank, a third valve assembly is provided between the second oil inlet and the outlet of the unit oil tank, and the controller is electrically connected to the third valve assembly.

10. A refrigeration oil purification device according to claim 9, characterized in that: At least one oil filter and / or at least one drying filter is arranged between the second oil inlet and the outlet of the unit oil tank.

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