Refrigerating machine oil split charging device and method

Abstract

The invention discloses a refrigerating machine oil subpackaging device and method, and the device comprises an oil pumping system which is disposed at an outlet of a crude oil barrel, and is used for pumping crude oil, controlling the pumping action and the pumping flow, and counting the number of the crude oil barrels for subpackaging oil; a liquid level switch is arranged on the transfer barrel to control starting and stopping of rear oil injection actions; the oil injection system is used for receiving the oil conveyed from the transfer barrel and injecting oil to the downstream according to the pressure difference and flow setting requirements; the filled oil barrel is arranged at the downstream of the oil injection system and injects oil to the system according to volume flow metering; and the gas constant-pressure system is arranged among the crude oil barrel, the transfer barrel and the filled oil barrel, works in linkage with the oil pumping system and is used for keeping air isolated in the engine oil split charging process. The invention aims to overcome the defects that the quality is influenced, the split charging precision is influenced, overpressure oil injection is caused, and split charging data cannot be monitored and managed in the split charging process of the barreled refrigerating machine oil at present.

Description

Technical Field

[0001] This application relates to the fields of air conditioning, refrigeration and HVAC technology. Specifically, it belongs to non-standard technical equipment and is widely used in industries such as large commercial air conditioners, refrigerators, household air conditioners and HVAC. It relates to the dispensing device and method for lubricating oil or refrigeration oil for compressors in refrigeration equipment. Background Technology

[0002] The lubricating oil used in compressors of refrigeration equipment, also known as refrigeration oil, mainly serves to cool, seal, lubricate, and reduce noise, ensuring the long-term, safe, and efficient operation of the compressor. The performance, quality, and service life of refrigeration oil play a crucial role in the stable and reliable operation of refrigeration equipment.

[0003] Refrigeration oil in refrigeration equipment requires regular changes. Generally, the industry recommends an oil change interval of 2000-3000 hours for open-type units and approximately 6000 hours for semi-hermetic units. Due to the need for regular oil changes in refrigeration equipment, manufacturers and oil suppliers repackage standard 200L drums of refrigeration oil into smaller containers (5L-20L). If moisture or air is introduced during this repackaging process, the moisture in the air will reduce the oil's viscosity, causing corrosion of metals. In Freon refrigeration systems, it can also lead to ice blockage.

[0004] Therefore, during the process of repackaging refrigeration oil from large drums to smaller drums, it is necessary to strictly isolate it from air and moisture. If the moisture content of the refrigeration oil added to the refrigeration equipment exceeds the standard, it will seriously affect the operating performance and service life of the refrigeration equipment.

[0005] To address this requirement, refrigeration equipment manufacturers and refrigeration oil suppliers currently use oil pumps and weighing to dispense refrigeration oil. However, this dispensing method has the following problems: 1. Quality issues: The equipment used in the refrigeration oil dispensing process is open. Since refrigeration oil has extremely strict requirements for water content (requirement <40mg / kg), the refrigeration oil left in the pipeline is exposed to air for a long time and is prone to deterioration.

[0006] 2. Accuracy issues: Refrigeration oil is generally measured by volume. Measuring by weight requires conversion and calculation based on density. However, the density of refrigeration oil varies at different temperatures, and there are errors in the weighing process. As a result, the final dispensing volume has an overall deviation of about 2%.

[0007] 3. Safety issues: Ordinary oil separators lack safety protection devices, and under overpressure conditions, oil spraying is very likely to occur.

[0008] 4. Data Management: The repackaging process of refrigeration oil is not monitored, and the process data cannot be compared or archived. Summary of the Invention

[0009] The technical problem to be solved by this application is to provide a refrigeration oil dispensing device and method to improve the current defects of drummed refrigeration oil in terms of quality being affected by air contact during the dispensing process, dispensing accuracy, overpressure oil injection, and the inability to monitor and manage dispensing data.

[0010] The technical solution of this application is implemented as follows: A refrigeration oil dispensing device, characterized in that it comprises: The oil pumping system, located at the outlet of the crude oil barrel, is used to pump crude oil and control the pumping action and flow rate, and to count the number of crude oil barrels used for dispensing oil. The transfer tank is used to receive oil from the pumping system and output it according to the oil level setting; it is set downstream of the pumping system, with inlet at the top and outlet at the bottom, and is equipped with a liquid level switch to control the start and stop of the subsequent oil injection action. The oil injection system is located downstream of the transfer tank. It receives oil from the transfer tank and injects oil downstream according to the pressure difference and flow rate requirements. The start and stop of the oil injection system are controlled by a liquid level switch set in the transfer tank. The oil tank being filled is located downstream of the oil injection system, and oil is injected into the system according to the volumetric flow rate metering. The gas constant pressure system is installed between the crude oil barrel, the transfer barrel, and the filling barrel, and works in conjunction with the oil pumping system to keep the air isolated during the oil dispensing process.

[0011] In the above technical solution, the gas constant pressure system includes a gas pipeline installed between the crude oil tank and the transfer tank, a crude oil tank filling solenoid valve installed on the gas pipeline, and at least two series pressure reducing valves installed downstream of the crude oil tank filling solenoid valve. The first pressure reducing valve is connected to a gas source. Another gas pipeline is installed on the gas pipeline between the first and second pressure reducing valves and connected to the oil tank being filled. Gas filling terminals are installed at the connection points between each pipeline and the crude oil tank, the transfer tank, and the oil tank being filled.

[0012] In the above technical solution, the gas filling end is built into the transfer tank and the one-way valve at the inlet of the filling tank, and the residual oil is blown into the filling tank while filling with gas.

[0013] In the above technical solution, the gas constant pressure system is a nitrogen constant pressure system.

[0014] In the above technical solution, the oil pumping system includes at least an oil suction device that can be connected to the crude oil barrel, an oil suction solenoid valve for controlling the oil suction device, an oil suction pump motor, a check valve, and a shut-off valve downstream of the oil suction solenoid valve. The shut-off valve is connected downstream to the transfer barrel. The oil suction device is equipped with high and low liquid level sensors to control the start and stop of the oil pump motor and to count the number of crude oil barrels being dispensed. The start and stop of the oil pump motor are linked to the gas constant pressure system.

[0015] In the above technical solution, the oil suction device is a flexible joint that does not affect the wiring harness and pipes, and an oil suction pipe, a gas pipe and a signal line channel are provided on the cover of the oil suction device.

[0016] In the above technical solution, the transfer tank is equipped with at least three different liquid level valves (high, medium, and low) to control the start and stop of the oil pump motor and the injection pump of the oil pumping system.

[0017] In the above technical solution, the transfer oil drum is also equipped with a pressure gauge, a pressure sensor, and a one-way valve for gas balance.

[0018] In the above technical solution, the level valve is a float valve.

[0019] In the above technical solution, the diameter of the transfer barrel is preferably much smaller than the height of the barrel, and it is integrated into the control cabinet along with the pipeline system.

[0020] In the above technical solution, the oil injection system includes, from upstream to downstream, an oil injection pump motor, a differential pressure controller and a filter in parallel assembly, a ball valve, a pressure sensor, a one-way valve to prevent backflow, a flow regulating valve for adjusting the maximum flow rate, a flow meter, and fast and slow filling pipelines. The fast and slow filling pipelines are located between the flow meter and the one-way valve at the inlet of the oil tank being filled, including a slow filling channel with a flow regulating valve and a solenoid valve connected in series, and a fast filling channel with only a solenoid valve connected in parallel.

[0021] In the above technical solution, the oil injection pipeline is equipped with a pressure sensor and an electrical contact pressure gauge, and secondary overpressure protection ensures the safe operation of the system.

[0022] In the above technical solution, an aerator is added to the end of the oil injection system, and a splash guard is installed at the bottom of the aerator.

[0023] In the above technical solution, the oil drum to be filled is placed on the oil receiving platform, and the oil receiving platform is preferably a grid-type inclined oil receiving tray.

[0024] In the above technical solution, the oil injection system uses a pulse-type volumetric flow meter. The flow meter measures the volume of the fluid based on the pulses generated as the fluid passes through it, and the vortex flow meter is unaffected by fluid temperature, pressure, density, and viscosity.

[0025] Based on the above-mentioned apparatus, the present invention also provides a method for dispensing refrigeration oil, characterized by comprising at least: Gas constant pressure control steps: Determine if the crude oil tank has a low oil level and monitor the gas pressure in the crude oil tank; if it is not a low oil level, the liquid level is normal and the crude oil tank charging solenoid valve is opened; otherwise, a low liquid level alarm is triggered and the crude oil tank charging solenoid valve is closed; when the crude oil tank pressure is normal, the gas constant pressure system operates normally; otherwise, a high pressure judgment is made and an over-pressure alarm or a low pressure alarm is triggered to ensure the gas constant pressure setting of the system. And at least one of the following three steps: Oil suction process: The oil suction device sucks oil from the crude oil barrel. When the liquid level exceeds the low level of the oil suction device, a low liquid level display is made and an oil shortage warning is given. The oil suction system stops operating. Otherwise, the liquid level is displayed as medium level. When the liquid level exceeds the high level of the oil suction device, the liquid level is displayed as medium or high level depending on the specific liquid level. Oil filling process: The transfer tank fills the oil tank with oil, and the pressure of the oil filling pump is monitored. When the outlet pressure of the oil filling pump is abnormal, a pressure alarm is triggered and oil filling is stopped. At the same time, filter blockage alarm is monitored. When blockage is detected, an alarm is triggered and oil filling is stopped. Operating steps of the transfer tank: The transfer tank starts working with top inlet and bottom outlet. When none of the high, low, and medium level valves trigger an alarm, the liquid level display shows normal and the current liquid level, while simultaneously checking whether the pressure inside the transfer tank is too high. When the medium and high liquid levels trigger alarms, the oil suction pump stops working and the oil suction solenoid valve closes. When the low liquid level alarm is triggered, the oil injection pump stops working, and simultaneously checks whether the oil suction system is on. If it is not on, it remains in standby mode; if it is on, it continues to suction oil. When the pressure inside the transfer tank is too high, the transfer tank triggers a high-pressure alarm and stops suction oil.

[0026] In the above technical solution, when the oil filling begins, the fast charging channel solenoid valve and the slow charging channel solenoid valve of the oil filling system open simultaneously. When the target oil filling value is close to completion, the fast charging solenoid valve closes until the oil filling is completed.

[0027] In the above technical solution, after the oil injection is completed, the flow meter feeds back the injection volume to the system storage, and the display screen shows the injection volume and injection result.

[0028] In the above technical solution, the pre-filling gas constant pressure system automatically purges the filling tank to expel the air inside.

[0029] Specifically, the refrigeration oil dispensing process of this invention is as follows: crude oil drum → oil suction system (oil suction gun, oil pump motor, check valve, shut-off valve) → transfer drum (oil drum, float valve, pressure gauge, pressure sensor, check valve) → oil filling system (oil pump motor, filter, pressure sensor, check valve, flow meter, etc.) → filling drum ① The nitrogen constant pressure system ensures that air is isolated during the refrigeration oil dispensing process to prevent oil deterioration; ② Oil pumping system: High and low liquid level sensors are set to control the start and stop of the oil suction pump and count the number of crude oil barrels for dispensing oil. The start and stop of the oil pump are linked with the nitrogen system. ③ Transfer tank: The top inlet and bottom outlet ensures that there is no gas in the oil injection pipeline and ensures metering accuracy. The transfer tank is equipped with high, medium and low float valves to control the start and stop of the oil suction pump and the main oil pump.

[0030] ④ Oil Injection System: A pulse-type volumetric flow meter is used to measure the oil injection volume, and an automatic switching system for fast and slow injection pipelines is set up to ensure the accuracy of oil pump injection while improving injection efficiency. Related protection devices are also installed to ensure the safe operation of the system.

[0031] Compared to existing technologies, the beneficial effects of this application are: 1. The repackaging of refrigeration oil completely isolates it from air, ensuring the quality of the repackaged refrigeration oil and guaranteeing the long-term safe and effective operation of refrigeration equipment.

[0032] By setting up a nitrogen constant pressure system, the refrigeration oil is kept away from air during the dispensing process and the refrigeration oil remaining in the pipeline after dispensing, thus preventing the oil from deteriorating.

[0033] 2. No need to clean the pipes for the next repackaging; repack directly. The residual refrigeration oil in the pipes can be used directly, eliminating losses during the repackaging process.

[0034] 3. Before filling, the equipment automatically purges the empty barrel to remove the air inside.

[0035] 4. Once the transfer container runs out of oil, it can automatically replenish oil and continue dispensing. No personnel are required to supervise the dispensing process. 5. By setting the main solenoid valve on the fast charging channel and the auxiliary solenoid valve on the slow charging channel, the fast and slow charging modes are automatically switched to ensure charging accuracy while improving charging efficiency.

[0036] 6. Ensure safe system operation by using pressure sensors, electrical contact pressure gauges, check valves, relief valves, and level sensors.

[0037] 7. The transfer tank has an inlet at the top and an outlet at the bottom, and a liquid level switch controls the start and stop of the oil injection pump. There is no gas in the filling pipeline, and the volumetric flow meter is used for measurement. The overall filling accuracy can reach 0.5%. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1This is a structural diagram of an embodiment of the refrigeration oil dispensing device of this application; Figure 2 This is a control system diagram of an embodiment of the refrigeration oil dispensing device of this application.

[0040] Figure 3 This is a control chart for oil absorption detection in the refrigeration oil dispensing method of this application.

[0041] Figure 4 This is a control chart for the oil filling test of the refrigeration oil dispensing method of this application.

[0042] Figure 5 This is a diagram showing the liquid level and pressure control of the transfer tank in the refrigeration oil dispensing method of this application.

[0043] Figure 6 This is the constant pressure control diagram for this application (the inlet is the oil suction system and the oil suction gun).

[0044] Figure 7 This is an oil filling control diagram for the refrigeration oil dispensing method of this application.

[0045] Figure 8 This is a structural diagram of another embodiment of the refrigeration oil dispensing device for the machine itself.

[0046] Figure 9 for Figure 8 A stereoscopic view from another perspective.

[0047] 1-Crude oil barrel, 2-Suction gun, 3-Suction solenoid valve, 4-Crude oil suction pump, 5-Suction check valve, 6-Suction shut-off valve, 7-Transfer barrel, 8-Transfer barrel pressure gauge, 9-Pressure sensor, 10-Exhaust check valve, 11-High level float valve, 12-Medium level float valve, 13-Low level float valve, 14-Maintenance shut-off valve, 15-Transfer barrel suction pump, 16-Oil filter, 17-Sampling shut-off valve, 18-Electrical contact pressure gauge, 19-Pipeline pressure sensor, 20-Pipeline check valve, 21-Flow regulating valve, 22-Volume flow meter, 23-Slow injection solenoid valve, 24-Slow injection regulating valve, 25-Fast injection solenoid valve, 26-Injection check valve, 27-Aerator filter screen, 28-Injected oil barrel. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0051] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0052] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0053] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0055] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0056] Example 1 like Figure 1 and 2 As shown, the refrigeration oil dispensing device according to the present invention is characterized by comprising: The oil pumping system, located at the outlet of crude oil barrel 1, is used to pump crude oil and control the pumping action and flow rate, and to count the number of crude oil barrels used for dispensing oil. Transfer tank 7 is used to receive oil from the pumping system and output it according to the oil level setting; it is set downstream of the pumping system, with inlet at the top and outlet at the bottom, and is equipped with a liquid level switch to control the start and stop of the oil injection operation. The oil injection system is located downstream of the transfer tank 7. It receives oil from the transfer tank 7 and injects oil downstream according to the pressure difference and flow rate requirements. The start and stop of the oil injection system are controlled by the liquid level switch installed in the transfer tank 7. The oil tank 28 is located downstream of the oil injection system and injects oil into the system according to the volumetric flow rate metering. A constant pressure gas system is installed between the crude oil tank 1, the transfer tank 7, and the filling tank 28 to keep the oil isolated from air during the oil dispensing process and works in conjunction with the oil pumping system.

[0057] In the above technical solution, the gas constant pressure system includes a gas pipeline installed between the crude oil tank 1 and the transfer tank 7. A crude oil tank filling solenoid valve 3 is installed on the gas pipeline, and at least two series pressure reducing valves are installed downstream of the crude oil tank filling solenoid valve 3. The first pressure reducing valve is connected to a gas source. Another gas pipeline is installed on the gas pipeline between the first and second pressure reducing valves and connected to the oil tank 28 to be filled. Gas filling terminals are installed at the communication points between each pipeline and the crude oil tank 1, the transfer tank 7, and the oil tank to be filled.

[0058] The entire system is controlled by a PLC and is equipped with monitoring and control processes such as nitrogen micro-pressurization protection, overpressure protection, oil pump anti-dry burning protection, system high liquid level and low liquid level protection, and filter blockage monitoring.

[0059] In the above technical solution, the oil pumping system includes at least an oil suction device (oil suction gun 2) that can be connected to the crude oil barrel, an oil suction solenoid valve 3 for controlling the oil suction device, a crude oil suction pump 4 (oil suction pump motor) downstream of the oil suction solenoid valve 3, an oil suction check valve 5, and an oil suction shut-off valve 6. The downstream of the oil suction shut-off valve 6 is connected to the transfer barrel 7. The oil suction device is equipped with high and low liquid level sensors to control the start and stop of the oil pump motor and to count the number of crude oil barrels for dispensing oil. The start and stop of the oil pump motor is linked to the gas constant pressure system.

[0060] In the above technical solution, the oil suction device is a union-type device (oil suction gun 2) that does not affect the wire harness and pipes. The oil suction pipe, gas pipe and signal line channel are set on the cover of the oil suction device.

[0061] In the above technical solution, the transfer tank 7 is equipped with at least three different liquid level valves (11-high liquid level float valve, 12-medium liquid level float valve, 13-low liquid level float valve) to control the start and stop of the crude oil suction pump 4 and the oil injection pump (transfer tank suction pump 15) of the oil pumping system.

[0062] A maintenance shut-off valve 14 is installed between the crude oil barrel outlet suction shut-off valve 6 and the transfer barrel 7.

[0063] The transfer tank 7 is equipped with a one-way vent valve 7 to maintain pressure balance. The transfer tank 7 is also equipped with a pressure gauge 8 and a pressure sensor 9 to detect the pressure inside the tank.

[0064] A sampling shut-off valve 17 is installed between the lower outlet of the transfer tank and the oil injection pump motor of the oil injection system.

[0065] The oil filling system, from upstream to downstream, includes an oil filling pump motor (oil filling pump or transfer tank suction pump 15), a differential pressure controller and oil filter 16 in parallel assembly, a ball valve, a pipeline pressure sensor 19, a pipeline check valve 20 to prevent backflow, a flow regulating valve 21 for adjusting the maximum flow rate, a volumetric flow meter 22, and fast and slow filling pipelines. The fast and slow filling pipelines are located between the flow meter and the check valve at the inlet of the oil tank being filled. They include a slow filling channel with a flow regulating valve (slow filling regulating valve 24) connected in series with a slow filling solenoid valve 23, and a fast filling channel connected in parallel with only a fast filling solenoid valve 25.

[0066] The oil filling check valve 26 is located near the inlet of the oil tank 28 being filled.

[0067] In the above technical solution, the oil injection pipeline is equipped with a pipeline pressure sensor 19 and an electrical contact pressure gauge 18, and secondary overpressure protection ensures the safe operation of the system.

[0068] In the above technical solution, an aerator (including aerator filter 27) is added to the end of the oil injection system.

[0069] like Figure 3-6The following sections provide a detailed introduction to the system design and control process described above.

[0070] Oil absorption system design: 1. The oil suction gun adopts an integrated design of oil suction pipe, wiring harness and nitrogen pipe, and the handle adopts a flexible joint design to ensure the sealing of the crude oil tank; 2. When the oil suction gun is at a low liquid level, it will give a prompt to change the oil container if there is no oil or to control the start and stop of the oil suction pump and nitrogen solenoid valve. 3. The low-level float valve in the transfer tank controls the start and stop of the main oil pump, and the high-level float valve indicates a full oil alarm to prevent the float from failing at the intermediate level; 4. The nitrogen in the transfer tank is precisely controlled at 0.015MPa by a two-stage pressure reducing valve, and the opening pressure of the check valve is 0.021MPa. When the oil level in the transfer tank decreases, nitrogen is supplied to the transfer tank through the nitrogen pipeline. When the oil level increases, the pressure is discharged outward by the check valve. The system maintains a slight positive pressure to ensure the quality of the oil. 5. Shut-off valves are installed at the front and rear of the transfer tank, and a drain valve is installed at the bottom for easy system maintenance and cleaning.

[0071] Oil injection system design: 1. The pipeline is equipped with a filter to ensure the quality of the packaged oil. Differential pressure controllers are installed before and after the filter. The system prompts to replace the filter element when the filter is dirty or clogged. 2. Pressure sensors and electrical contact pressure gauges are installed in the oil injection pipeline, and secondary overpressure protection ensures safe system operation; 3. The metering device adopts a pulse-type vortex flow meter, which measures the volume of the fluid based on the pulses generated when the fluid passes through the flow meter. The vortex flow meter is not affected by the fluid temperature, pressure, density, and viscosity. 4. When the oil filling begins, the main solenoid valve and the auxiliary solenoid valve open simultaneously. When the target oil filling value is close to completion, the main solenoid valve closes until the oil filling is complete. 5. After the oil filling is completed, the flow meter will send the filling volume back to the system storage, and the display screen will show the filling volume and the filling result.

[0072] The oil injection system workflow diagram is as follows: Figure 7 As shown, after the parameters are set, the main solenoid valve of the fast charging channel and the auxiliary solenoid valve of the slow charging channel are opened respectively to determine whether the oil pump is overloaded. If so, the overload alarm is activated and the overload is restored until it is normal. Then the oil injection pump starts working, the flow meter starts counting, and it determines whether it is close to the target oil injection value. If it is close to the target value, the main solenoid valve closes, and it determines whether it is close to the target oil injection value again. If the target value is reached, the auxiliary solenoid valve and the oil injection pump are closed; then the system shuts down.

[0073] Specifically, the refrigeration oil dispensing process of this invention is as follows: crude oil drum → oil suction system (oil suction gun, oil pump motor, check valve, shut-off valve) → transfer drum (oil drum, float valve, pressure gauge, pressure sensor, check valve) → oil filling system (oil pump motor, filter, pressure sensor, check valve, flow meter, etc.) → filling drum ① The nitrogen constant pressure system ensures that air is isolated during the refrigeration oil dispensing process to prevent oil deterioration; ② Oil pumping system: High and low liquid level sensors are set to control the start and stop of the oil suction pump and count the number of crude oil barrels for dispensing oil. The start and stop of the oil pump are linked with the nitrogen system. ③ Transfer tank: The top inlet and bottom outlet ensures that there is no gas in the oil injection pipeline and ensures metering accuracy. The transfer tank is equipped with high, medium and low float valves to control the start and stop of the oil suction pump and the main oil pump.

[0074] ④ Oil Injection System: A pulse-type volumetric flow meter is used to measure the oil injection volume, and an automatic switching system for fast and slow injection pipelines is set up to ensure the accuracy of oil pump injection while improving injection efficiency. Related protection devices are also installed to ensure the safe operation of the system.

[0075] 1. Quality Management: Through low-pressure gas protection, especially nitrogen, the entire process from raw material → transportation → packaging is protected by a closed low-pressure nitrogen system to prevent contact with outside air. A transfer tank is added, in which the refrigeration oil enters from the top and exits from the bottom, ensuring that the filling pipeline is free of gas. The transfer tank is kept at a slight positive pressure of nitrogen to ensure that the oil does not deteriorate.

[0076] 2. Precision control: Volumetric flow rate is used for metering, and the main and auxiliary solenoid valves of the oil supply are linked by PLC to accurately control the filling accuracy. The overall filling accuracy can reach 0.5% when there is no gas in the filling pipeline.

[0077] 3. Safety features: The entire system is automatically managed by a PLC and is equipped with nitrogen micro-pressurization protection, overpressure protection, oil pump anti-dry burning protection, system high liquid level and low liquid level protection, filter blockage monitoring, etc.

[0078] 4. High efficiency and intelligence: The PLC system provides automatic monitoring of the entire system, including the status of crude oil barrels, transfer barrels, and the oil injection system. It automatically controls the filling and oil suction processes, with nitrogen protection interlocks throughout the entire process. Filling data is available at any time.

[0079] Example 2 like Figure 8-9 As shown, by optimizing the system piping structure, the diameter of the transfer drum is reduced and the height is increased before it is built into the control cabinet, reducing the overall footprint of the device by about 50% and further improving the economy of the drum-type refrigeration oil dispensing device.

[0080] The oil drum 28 is placed on the oil receiving platform 29, which is preferably a grid-type inclined oil receiving tray. The oil receiving platform is changed to a grid, and the oil receiving tray is inclined at 5° to facilitate the cleaning of dripping residual oil.

[0081] Alternatively, an aerator can be added to the end of the oil injection system, and a splash guard 30 can be installed at the bottom of the aerator to make the flow of refrigeration oil at the outlet more uniform and prevent splashing.

[0082] Alternatively, the end nitrogen purging can be integrated into a one-way valve, allowing residual oil to be blown into the dispensing tank while nitrogen is being purged.

[0083] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A refrigeration oil dispensing device, characterized in that... include: The oil pumping system, located at the outlet of the crude oil barrel, is used to pump crude oil and control the pumping action and flow rate, and to count the number of crude oil barrels used for dispensing oil. The transfer tank is used to receive oil from the pumping system and output it according to the oil level setting; it is set downstream of the pumping system, with oil entering from the top and exiting from the bottom, and controls the start and stop of the oil injection operation behind it. The oil injection system is located downstream of the transfer tank, receives oil from the transfer tank, and injects oil downstream according to the pressure difference and flow rate requirements. The oil tank being filled is located downstream of the oil injection system, and oil is injected into the system according to the volumetric flow rate metering. The gas constant pressure system is installed between the crude oil barrel, the transfer barrel, and the filling barrel, and works in conjunction with the oil pumping system to keep the air isolated during the oil dispensing process.

2. The refrigeration oil dispensing device according to claim 1, characterized in that... The gas constant pressure system includes a gas pipeline located between the crude oil tank and the transfer tank. A crude oil tank filling solenoid valve is installed on the gas pipeline, and at least two series pressure reducing valves are located downstream of the crude oil tank filling solenoid valve. The first pressure reducing valve is connected to a gas source. Another gas pipeline is installed on the gas pipeline between the first and second pressure reducing valves and connected to the oil tank being filled. Gas filling terminals are installed at the connection points of each pipeline with the crude oil tank, the transfer tank, and the oil tank being filled.

3. The refrigeration oil dispensing device according to claim 2, characterized in that... The gas filling end is built into the one-way valve at the inlet of the transfer tank and the filling tank, and the residual oil is blown into the filling tank while filling with gas.

4. The refrigeration oil dispensing device according to claim 1, characterized in that... The oil pumping system includes at least an oil suction device that can be docked with crude oil barrels, an oil suction solenoid valve for controlling the oil suction device, an oil suction pump motor, a check valve, and a shut-off valve downstream of the oil suction solenoid valve. The shut-off valve is connected downstream to a transfer barrel. The oil suction device is equipped with high and low liquid level sensors to control the start and stop of the oil pump motor and to count the number of crude oil barrels being dispensed. The start and stop of the oil pump motor are linked to the gas constant pressure system.

5. The refrigeration oil dispensing device according to claim 4, characterized in that... The oil suction device is designed with a flexible joint that does not affect the wiring harness and pipes. The oil suction pipe, gas pipe and signal line channel are set on the cover of the oil suction device.

6. The refrigeration oil dispensing device according to claim 1, characterized in that... The transfer tank is equipped with at least three different liquid level valves (high, medium, and low) to control the start and stop of the oil pump motor and the injection pump of the oil pumping system.

7. The refrigeration oil dispensing device according to claim 1, characterized in that... The transfer barrel is preferably set with a diameter much smaller than its height, and is integrated into the control cabinet along with the piping system.

8. The refrigeration oil dispensing device according to claim 1, characterized in that... The oil filling system, from upstream to downstream, includes an oil pump motor, a differential pressure controller and a filter in parallel assembly, a ball valve, a pressure sensor, a check valve to prevent backflow, a flow regulating valve for adjusting the maximum flow rate, a flow meter, and fast and slow filling pipelines. The fast and slow filling pipelines are located between the flow meter and the check valve at the inlet of the oil tank being filled. They include a slow filling channel with a flow regulating valve and a solenoid valve connected in series, and a fast filling channel with only a solenoid valve connected in parallel.

9. A method for dispensing refrigeration oil, characterized in that... The refrigeration oil dispensing device according to any one of claims 1-8 comprises at least: Gas constant pressure control steps: Determine if the crude oil tank has a low oil level and monitor the gas pressure in the crude oil tank; if it is not a low oil level, the liquid level is normal and the crude oil tank charging solenoid valve is opened; otherwise, a low liquid level alarm is triggered and the crude oil tank charging solenoid valve is closed; when the crude oil tank pressure is normal, the gas constant pressure system operates normally; otherwise, a high pressure judgment is made and an over-pressure alarm or a low pressure alarm is triggered to ensure the gas constant pressure setting of the system. And at least one of the following three steps: Oil suction process: The oil suction device sucks oil from the crude oil barrel. When the liquid level exceeds the low level of the oil suction device, a low liquid level display is made and an oil shortage warning is given. The oil suction system stops operating. Otherwise, the liquid level is displayed as medium level. When the liquid level exceeds the high level of the oil suction device, the liquid level is displayed as medium or high level depending on the specific liquid level. Oil filling process: The transfer tank fills the oil tank with oil, and the pressure of the oil filling pump is monitored. When the outlet pressure of the oil filling pump is abnormal, a pressure alarm is triggered and oil filling is stopped. At the same time, filter blockage alarm is monitored. When blockage is detected, an alarm is triggered and oil filling is stopped. Operating steps of the transfer tank: The transfer tank starts working with top inlet and bottom outlet. When none of the high, low, and medium level valves trigger an alarm, the liquid level display shows normal and the current liquid level, while simultaneously checking whether the pressure inside the transfer tank is too high. When the medium and high liquid levels trigger alarms, the oil suction pump stops working and the oil suction solenoid valve closes. When the low liquid level alarm is triggered, the oil injection pump stops working, and simultaneously checks whether the oil suction system is on. If it is not on, it remains in standby mode; if it is on, it continues to suction oil. When the pressure inside the transfer tank is too high, the transfer tank triggers a high-pressure alarm and stops suction oil.

10. The method for dispensing refrigeration oil according to claim 9, characterized in that... When the oil filling begins, the fast charging channel solenoid valve and the slow charging channel solenoid valve of the oil filling system open simultaneously. When the target oil filling value is close to completion, the fast charging solenoid valve closes until the oil filling is complete.

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