Oil discharge structure and oil discharge method of air compressor

Abstract

The present application belongs to air compressor technical field, especially relate to a kind of air compressor oil drain structure and oil drain method, including the following steps: step one: remove filter;Step two: install oil change cover in the place where filter is originally installed;Step three: inject gas into oil change cover, gas pushes lubricating oil in machine head, radiator pipe, pipeline connecting machine head and oil gas bucket, and pipeline connecting filter and machine head into oil gas bucket;Step four: stop gas injection, open blowdown of oil gas bucket to discharge lubricating oil.The present application can effectively discharge lubricating oil in machine head, radiator pipe, pipeline connecting machine head and oil gas bucket, and pipeline connecting filter and machine head, and old lubricating oil emptying effect is good, oil change effect is good.

Description

Technical Field

[0001] This invention belongs to the field of air compressor technology, and specifically relates to an oil draining structure and method for an air compressor. Background Technology

[0002] An air compressor is a device used to compress gas, converting kinetic mechanical energy into gas pressure energy. An air compressor generally includes a compressor head, an oil-gas separator, cooling pipes, an oil separator element, and a filter. Its working principle is as follows: the high-pressure, high-temperature oil-gas mixture exiting the compressor head is separated into oil and gas by the oil-gas separator. The compressed gas is further separated into lubricating oil by the oil separator element and then stored in an air tank. The lubricating oil in the oil-gas separator is cooled by the cooling pipes and flows into the filter for filtration. The filtered oil then flows back into the compressor head to mix with the gas.

[0003] When maintaining an air compressor, the lubricating oil needs to be changed. A drain port is usually installed on the oil-gas separator to drain the lubricating oil from the separator, and then new lubricating oil is added.

[0004] The shortcomings of existing oil draining methods are that lubricating oil is not only present in the oil-gas separator, but also in the cooling pipes, the machine head, the pipes connecting the machine head and the oil-gas separator, and the pipes connecting the filter and the machine head. Existing oil draining methods can only drain the lubricating oil in the oil-gas separator, but cannot drain the lubricating oil in the cooling pipes, the machine head, the pipes connecting the machine head and the oil-gas separator, and the pipes connecting the filter and the machine head, resulting in poor oil change results. Summary of the Invention

[0005] The purpose of this invention is to provide an oil draining structure and method for an air compressor, which can effectively drain the lubricating oil in the compressor head, cooling pipe, pipe connecting the compressor head and the oil-gas tank, and pipe connecting the filter and the compressor head. The old lubricating oil is drained effectively, and the oil change is efficient.

[0006] The objective of this invention is achieved as follows:

[0007] One object of the present invention is to provide a method for draining oil from an air compressor, comprising the following steps:

[0008] Step 1: Remove the filter;

[0009] Step 2: Install the oil change cap where the filter was originally installed;

[0010] Step 3: Inject gas into the oil change cap. The gas will push the lubricating oil in the engine head, cooling pipes, pipes connecting the engine head and the oil-gas tank, and pipes connecting the filter and the engine head into the oil-gas tank.

[0011] Step 4: Stop gas injection and open the drain port of the oil-gas tank to discharge lubricating oil.

[0012] In the above-mentioned method for draining oil from an air compressor, the time for injecting gas into the oil change cap is approximately 60 seconds.

[0013] In the above-mentioned method for draining oil from an air compressor, the gas is compressed air.

[0014] In the above-mentioned method for draining oil from an air compressor, the opening and closing of the drain port of the oil-gas separator is as follows: unscrew the plug inside the drain valve and connect it to the drain hose; open the drain valve to start draining the lubricating oil; after the drain is completed, close the drain valve, remove the drain hose, and reinstall the plug.

[0015] In the above-mentioned method for draining oil from an air compressor, in step one, before removing the filter, the air compressor is run for a period of time and then shut down, and the filter is removed after a period of time.

[0016] In the above-mentioned method for draining oil from an air compressor, the air compressor is turned off after running for 5-15 minutes, and the filter is removed after waiting for more than two minutes.

[0017] In the above-mentioned method for draining oil from an air compressor, in step three, before injecting gas into the oil change cap, the oil separator core installed on the oil-gas separator is loosened. The gas pushes the lubricating oil in the compressor head, cooling pipe, pipe connecting the compressor head and the oil-gas separator, and pipe connecting the filter and the compressor head into the oil-gas separator, and then flows out from the pipe joint of the oil separator core.

[0018] In one of the above-mentioned methods for draining oil from an air compressor, use a special wrench to loosen the oil separator core counterclockwise, and then turn it about one turn after loosening.

[0019] In the above-mentioned method for draining oil from an air compressor, after draining the sludge, remove the oil separator core, inject lubricating oil through the air outlet channel of the oil-gas separator end cap, install a brand new oil separator core, remove the oil change cap, install a brand new filter, and the oil change is complete.

[0020] In the above-mentioned method for draining oil from an air compressor, after the oil change is completed, turn on the air compressor and run it for 10 minutes. Then observe whether the oil level sight glass on the oil-gas tank meets the standard of the oil level diagram. If a small adjustment is required, it should be done two minutes after turning off the power to the machine. Add oil through the oil filling port located on the end cover of the oil-gas tank.

[0021] Another objective of this invention is to provide an oil draining structure for an air compressor, comprising a compressor head, an oil-gas separator, a filter, and a cooling pipe. One end of the cooling pipe is connected to the oil-gas separator, and the other end is connected to the filter. The filter is connected to the compressor head via a pipe, and the compressor head is connected to the oil-gas separator via a pipe. The invention is characterized by further including a mounting base on which an oil change cover and the filter can be selectively mounted. The mounting base is provided with an oil inlet channel, an oil outlet channel, and a mounting groove. The mounting groove has an oil inlet communicating with the oil inlet channel and an oil outlet communicating with the oil outlet channel. In the oil draining state, the oil change cover is mounted on the mounting groove. The inner cavity of the oil change cover communicates with the oil inlet and the oil outlet. The gas introduced into the oil change cover is divided into two parts: one part flows into the oil-gas separator through the oil inlet, the oil inlet channel, and the cooling pipe; the other part flows into the oil-gas separator through the oil outlet, the oil outlet channel, the pipe connecting the filter and the compressor head, the compressor head, and the pipe connecting the compressor head and the oil-gas separator.

[0022] In the oil draining structure of the aforementioned air compressor, a connector is provided on the oil outlet, and a hollow external threaded post is provided at the end of the connector away from the oil outlet. The oil change cover includes a cover body covering the mounting groove. An air inlet is provided on the cover body, and an internal threaded post fitted on the external threaded post is provided inside the cover body. The inner hole of the internal threaded post communicates with the air inlet. A communicating hole is provided on the side wall of the internal threaded post, connecting the inner hole of the internal threaded post with the inner cavity of the cover body. Part of the gas introduced into the air inlet flows into the oil outlet, and the other part of the gas flows into the oil inlet through the communicating hole and the inner cavity of the cover body.

[0023] In the oil draining structure of an air compressor, the connector is screwed onto the oil outlet.

[0024] In the oil draining structure of the air compressor described above, when the filter is installed on the mounting slot during normal use, the filter's oil drain channel is connected to the connector, the filter's sludge oil channel is connected to the oil inlet, and the filter's oil drain channel is connected to the oil outlet.

[0025] In the oil draining structure of the air compressor described above, the outer wall of the internally threaded column is connected to the inner wall of the cover by a connecting plate.

[0026] In the oil draining structure of the air compressor described above, multiple connecting plates are evenly distributed around the circumference.

[0027] In the oil draining structure of the above-mentioned air compressor, a connecting pipe connecting to the air inlet is provided on the outer side of the cover. The connecting hole is an elongated notch arranged along the axial direction of the internal thread column. The depth of the elongated notch is greater than the depth of the external thread column entering the internal thread column.

[0028] In the oil draining structure of the aforementioned air compressor, there are two or more elongated notches.

[0029] In the above-mentioned oil draining structure of an air compressor, the oil-gas tank includes a barrel body with an opening at the top and an end cap disposed above the barrel body. A guide shroud connected to the end cap is provided inside the barrel body, and an annular channel is formed between the barrel body and the guide shroud. The mounting base is the end cap, and an air inlet channel one is provided on the end cap. An air inlet channel two is provided on the guide shroud, which connects the air inlet channel one and the annular channel.

[0030] In the above-mentioned oil draining structure of an air compressor, the first intake channel includes a horizontal channel and a vertical channel that connects to the horizontal channel. The second intake channel includes a horizontal channel leading to an annular channel and a vertical channel that connects to the horizontal channel at its lower end. The lower end of the vertical channel connects to the upper end of the vertical channel.

[0031] In the oil draining structure of the air compressor described above, an oil separator core is provided on the end cover. When draining oil, the pipe joint of the oil separator core is loosened, and the gas introduced into the oil change cover flows out from the gap between the pipe joint and the end cover after passing through various components.

[0032] In the oil discharge structure of the aforementioned air compressor, the oil separator core further includes an outer cover, filter cotton, and an air guide pipe. The filter cotton divides the inner cavity of the outer cover into an air inlet chamber and an air outlet chamber. The upper end of the air guide pipe is located in the air outlet chamber and communicates with it. The lower end of the air guide pipe is located in the pipe joint. An oil outlet gap is left between the air guide pipe and the pipe joint. The outer cover is provided with an air inlet hole that communicates with the air inlet chamber. The end cover is also provided with an air outlet channel one, an air outlet channel two, and an oil outlet hole. The air outlet channel one communicates with the inner cavity of the barrel and the air inlet hole. The air outlet channel two communicates with the lower end of the air guide pipe. The oil outlet hole communicates with the oil outlet gap.

[0033] In the oil draining structure of the air compressor described above, the air inlet is located below the air inlet chamber, and the air outlet is located below the air inlet.

[0034] In the oil draining structure of the air compressor described above, the guide shroud is made of plastic, and the end cap is formed by casting.

[0035] In the oil discharge structure of the aforementioned air compressor, there is also an air tank for storing compressed gas and a cooling fan for cooling the heat dissipation pipes. The compressor head, oil-gas tank and cooling fan are all mounted on the air tank.

[0036] The outstanding and beneficial technical effects of this invention compared to the prior art are:

[0037] 1. In this invention, when draining oil, the filter is replaced with an oil change cap. Gas is injected into the oil change cap, and the gas pushes the lubricating oil in the machine head, cooling pipes, pipes connecting the machine head and the oil-gas tank, and pipes connecting the filter and the machine head into the oil-gas tank. Then, the lubricating oil in the oil-gas tank is released. This effectively drains the lubricating oil from the machine head, cooling pipes, pipes connecting the machine head and the oil-gas tank, and pipes connecting the filter and the machine head. The old lubricating oil is drained well, and then new lubricating oil is injected, resulting in a good oil change effect. This invention does not require a complicated oil change device, the oil change operation is simple and quick, has little impact on production, does not require professional on-site service, reduces usage costs, and has a good oil change effect.

[0038] 2. This invention releases gas by loosening the oil separator core installed on the oil-gas tank, without the need for additional venting structures, making it simple to operate;

[0039] 3. The first air inlet channel of the oil and gas tank of the present invention is set on the end cap, and the second air inlet channel is set on the guide shroud. The air inlet channel is not set on the tank body, which facilitates the processing of the tank body and reduces the processing cost. Attached Figure Description

[0040] Figure 1 This is a front view of the filter of the present invention installed on an air compressor;

[0041] Figure 2 This is a perspective view of the oil change cap of the present invention installed on the oil and gas tank;

[0042] Figure 3 This is a perspective view of the oil change cap of the present invention;

[0043] Figure 4 This is a perspective view of the oil and gas tank of the present invention without the filter and oil change cap installed;

[0044] Figure 5 This is a perspective view of the end cap of the present invention;

[0045] Figure 6 This is a cross-sectional view of the oil and gas tank of the present invention;

[0046] Figure 7 This is a partial cross-sectional view of the oil separator core and end cap of the present invention.

[0047] Attached reference numerals: 1. Engine head; 2. Oil-gas separator; 2a. Separator body; 2b. End cap; 2c. Flow guide; 3. Filter; 4. Cooling pipe; 5. Oil change cap; 5a. Cover body; 5b. Internal threaded post; 5c. Connecting plate; 5d. Connecting pipe; 6. Oil inlet channel; 7. Oil outlet channel; 8. Mounting slot; 9. Oil inlet; 10. Oil outlet; 11. Connector; 12. External threaded post; 13. Air inlet; 14. 15. Connecting hole; 16. Annular channel; 17. Air intake channel one; 18. Air intake channel two; 19. Oil separator core; 10. Pipe connector; 11. Outer cover; 12. Filter cotton; 13. Air guide pipe; 24. Air outlet chamber; 25. Oil outlet gap; 26. Air outlet hole; 27. Air storage tank; 28. Cooling fan. Detailed Implementation

[0048] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1 —7:

[0049] One object of the present invention is to provide a method for draining oil from an air compressor, comprising the following steps:

[0050] Step 1: Remove filter 3;

[0051] Step 2: Install the oil change cap 5 in the original location where the filter 3 was installed;

[0052] Step 3: Inject gas into the oil change cap 5. The gas will push the lubricating oil in the machine head 1, the heat pipe 4, the pipe connecting the machine head 1 and the oil-gas tank 2, and the pipe connecting the filter 3 and the machine head 1 into the oil-gas tank 2.

[0053] Step 4: Stop gas injection and open the drain port of oil-gas tank 2 to discharge lubricating oil.

[0054] In this invention, when draining oil, the filter 3 is replaced with an oil change cap 5. Gas is injected into the oil change cap 5, and the gas pushes the lubricating oil in the machine head 1, the cooling pipe 4, the pipe connecting the machine head 1 and the oil-gas tank 2, and the pipe connecting the filter 3 and the machine head 1 into the oil-gas tank 2. Then, the lubricating oil in the oil-gas tank 2 is released. This can effectively drain the lubricating oil in the machine head 1, the cooling pipe 4, the pipe connecting the machine head 1 and the oil-gas tank 2, and the pipe connecting the filter 3 and the machine head 1. The old lubricating oil is drained well, and then new lubricating oil is injected, resulting in a good oil change effect.

[0055] This invention offers a simple and quick oil change procedure with minimal impact on production. It eliminates the need for professional on-site service, reducing operating costs and providing excellent oil change results.

[0056] Preferably, the time for injecting gas into the oil change cap 5 is about 60 seconds.

[0057] Preferably, the gas is compressed air, which is inexpensive and easy to produce.

[0058] To open and close the drain port of the oil and gas tank: unscrew the plug inside the drain valve and connect it to the drain hose. Open the drain valve to start discharging the lubricating oil. After discharging, close the drain valve, remove the drain hose, and reinstall the plug.

[0059] Furthermore, filter 3 is usually removed counterclockwise using a filter wrench, and then the oil change cap 5 is installed and tightened by hand.

[0060] Furthermore, in step one, before removing filter 3, run the air compressor for a period of time and then turn it off, waiting for a while before removing filter 3. The temperature generated by the air compressor during operation helps to expel the tiny particles suspended in the oil along with the lubricating oil.

[0061] Preferably, the air compressor is turned off after running for 5-15 minutes, and the filter 3 is removed after waiting for more than two minutes. In this embodiment, the air compressor is turned off after running for 10 minutes, and the filter 3 is removed after waiting for two minutes, automatically and completely releasing the internal pressure of the oil-gas tank 2.

[0062] In order to release the injected gas, in step three, before injecting gas into the oil change cap 5, the oil separator core 18 installed on the oil-gas tank 2 is loosened. The gas pushes the lubricating oil in the machine head 1, the cooling pipe 4, the pipe connecting the machine head 1 and the oil-gas tank 2, and the pipe connecting the filter 3 and the machine head 1 into the oil-gas tank 2, and then flows out from the pipe joint 18a of the oil separator core 18. This invention does not require an additional venting structure and is simple to operate.

[0063] Preferably, use a special wrench to loosen the oil separator core 18 counterclockwise, then turn it about one more turn. This allows for ventilation and prevents lubricating oil from splashing out during the next step of gas injection.

[0064] Oil filling process: After the sludge is drained, remove the oil separator core, inject lubricating oil through the vent channel of the end cap of the oil-gas tank, then install a brand new oil separator core, remove the oil change cap, install a brand new filter, and the oil change is complete.

[0065] Furthermore, after the oil change is completed, turn on the air compressor and run it for 10 minutes. Observe whether the oil level sight glass on the oil-gas tank meets the standard of the oil level diagram. If a small adjustment is required, it should be done two minutes after turning off the machine power. Add oil through the oil filling port set on the end cover of the oil-gas tank.

[0066] Another object of the present invention is to provide an oil draining structure for an air compressor, including a compressor head 1, an oil-gas separator 2, a filter 3, and a cooling pipe 4. One end of the cooling pipe 4 is connected to the oil-gas separator 2, and the other end is connected to the filter 3. The filter 3 is connected to the compressor head 1 through a pipe, and the compressor head 1 is connected to the oil-gas separator 2 through a pipe. The invention also includes a mounting base on which an oil change cover 5 and the filter 3 can be optionally mounted. The mounting base is provided with an oil inlet channel 6, an oil outlet channel 7, and a mounting groove 8. The mounting groove 8 has a connecting channel for the oil inlet channel. The oil inlet 9 of the oil channel 6 and the oil outlet 10 of the oil outlet channel 7 are connected. When the oil is drained, the oil change cover 5 is installed on the mounting groove 8. The inner cavity of the oil change cover 5 is connected to the oil inlet 9 and the oil outlet 10. The gas introduced into the oil change cover 5 is divided into two parts. One part of the gas flows into the oil-gas tank 2 through the oil inlet 9, the oil inlet channel 6, and the heat dissipation pipe 4. The other part of the gas flows into the oil-gas tank 2 through the oil outlet 10, the oil outlet channel 7, the pipe connecting the filter 3 and the machine head 1, the machine head 1, and the pipe connecting the machine head 1 and the oil-gas tank 2.

[0067] like Figure 1-5 As shown, this invention installs an oil change cap 5 at the location where the filter 3 is installed, and introduces gas into the oil change cap 5. During the gas flow, the lubricating oil in the machine head 1, the cooling pipe 4, the pipe connecting the machine head 1 and the oil-gas tank 2, and the pipe connecting the filter 3 and the machine head 1 are pushed into the oil-gas tank 2. This effectively discharges the lubricating oil in the machine head 1, the cooling pipe 4, the pipe connecting the machine head 1 and the oil-gas tank 2, and the pipe connecting the filter 3 and the machine head 1. The old lubricating oil is drained effectively, and then new lubricating oil is injected, resulting in a good oil change effect.

[0068] This invention eliminates the need for complex oil change devices, making it easy to operate and cost-effective.

[0069] The structure of oil change cap 5 and its connection structure: such as Figure 2-5 As shown, the oil outlet 10 is provided with a connector 11, and the end of the connector 11 away from the oil outlet 10 is provided with a hollow external threaded post 12. The oil change cover 5 includes a cover 5a covering the mounting groove 8. The cover 5a is provided with an air inlet 13. The cover 5a is provided with an internal threaded post 5b fitted on the external threaded post 12. The inner hole of the internal threaded post 5b is connected to the air inlet 13. The side wall of the internal threaded post 5b is provided with a connecting hole 14 connecting the inner hole of the internal threaded post 5b and the inner cavity of the cover 5a. Part of the gas introduced into the air inlet 13 flows into the oil outlet 10, and the other part of the gas flows into the oil inlet 9 through the connecting hole 14 and the inner cavity of the cover 5a.

[0070] Connection method between connector 11 and oil outlet 10: connector 11 is screwed onto oil outlet 10.

[0071] Preferably, the connector 11 and the external threaded post 12 are an integral structure.

[0072] When in normal use, with the filter 3 installed on the mounting slot 8, the oil drain channel of the filter 3 is connected to the connector 11, the sludge oil channel of the filter 3 is connected to the oil inlet 9, and the oil drain channel of the filter 3 is connected to the oil outlet 10.

[0073] To enhance the strength of the internally threaded post 5b, the outer wall of the internally threaded post 5b is connected to the inner wall of the cover 5a by a connecting plate 5c.

[0074] Furthermore, multiple connecting plates 5c are evenly distributed around their circumference. In this embodiment, six connecting plates 5c are evenly distributed around their circumference.

[0075] To facilitate the introduction of gas into the air inlet 13, such as Figure 2 As shown, the outer side of the cover 5a is provided with a connecting pipe 5d that connects to the air inlet 13.

[0076] To facilitate the machining of the connecting hole 14, such as Figure 3 As shown, the connecting hole 14 is an elongated notch arranged along the axial direction of the internal thread post 5b, and the depth of the elongated notch is greater than the depth of the external thread post 12 entering the internal thread post 5b.

[0077] Furthermore, there are two or more elongated notches. In this embodiment, there are two elongated notches evenly distributed around the circumference.

[0078] The structure of oil and gas tank 2: as follows Figure 2 , 4 As shown in Figure 6, the oil and gas tank 2 includes a tank body 2a with an open top and an end cap 2b disposed above the tank body 2a. A flow guide 2c connected to the end cap 2b is provided inside the tank body 2a, forming an annular channel 15 between the tank body 2a and the flow guide 2c. The mounting base is the end cap 2b, which has a first air intake channel 16. The flow guide 2c has a second air intake channel 17 connecting the first air intake channel 16 and the annular channel 15. In this invention, the first air intake channel 16 is disposed on the end cap 2b, and the second air intake channel 17 is disposed on the flow guide 2c. The absence of an air intake channel on the tank body 2a facilitates the processing of the tank body 2a and reduces processing costs.

[0079] The structure of intake passage 16 and intake passage 2 17: intake passage 16 includes a horizontal passage 1 and a vertical passage 1 that connects to the horizontal passage 1; intake passage 2 17 includes a horizontal passage 2 that leads to the annular passage 15 and a vertical passage 2 that connects to the horizontal passage 2 at its lower end; the lower end of the vertical passage 2 connects to the upper end of the vertical passage 2, so as to better guide the oil-gas mixture to the annular passage 15.

[0080] In order to discharge the injected gas, the end cap 2b is provided with an oil separator core 18. When the oil is drained, the pipe joint 18a of the oil separator core 18 is loosened, and the gas introduced into the oil change cap 5 flows out from the gap between the pipe joint 18a and the end cap 2b after passing through various components.

[0081] Furthermore, it also includes an air tank 26 for storing compressed gas and a cooling fan 27 for cooling the heat dissipation pipe 4. The machine head 1, the oil and gas tank 2, and the cooling fan 27 are all mounted on the air tank 26.

[0082] The structure of the oil separator core 18c: as follows Figure 1 , 2 As shown in Figures 4, 6, and 7, the oil separator core 18 further includes an outer cover 18b, a filter cotton 18c, and an air guide pipe 18d. The filter cotton 18c divides the inner cavity of the outer cover 18b into an air inlet chamber 19 and an air outlet chamber 20. The upper end of the air guide pipe 18d is located in the air outlet chamber 20 and communicates with it. The lower end of the air guide pipe 18d is located in the pipe connector 18a. An oil outlet gap 21 is left between the air guide pipe 18d and the pipe connector 18a. The outer cover 18b is provided with an air inlet hole 22 that communicates with the air inlet chamber 19. The end cap 2b is also provided with an air outlet channel 1 23, an air outlet channel 24, and an oil outlet hole 25. The air outlet channel 1 23 communicates with the inner cavity of the barrel body 2a and the air inlet hole 22. The air outlet channel 24 communicates with the lower end of the air guide pipe 18d. The oil outlet hole 25 communicates with the oil outlet gap 21. When the air compressor is in normal use, the gas after most of the oil is separated by the oil-gas separator 2 flows through the outlet channel 23, the inlet hole 22, and the inlet chamber 19. Most of the oil is absorbed by the filter cotton 18c, and a small amount of oil enters the outlet chamber 20 together with the gas. When the gas rushes through the guide pipe 18d, the oil condenses on the outer wall of the guide pipe 18d and flows out through the oil outlet gap 21 and the oil outlet hole 25. The gas flows out through the guide pipe 18d and the second outlet channel 24.

[0083] To better recover oil and reduce the burden on the filter cotton 18c, the air inlet 22 is located below the air inlet chamber 19, and the air outlet channel 23 is located below the air inlet 22. When oil and gas pass through the filter cotton 18c together, some oil condenses on the outside of the filter cotton 18c and, under the action of gravity, drips down through the air inlet 22 and the air outlet channel 23 to the bottom of the tank 2a, thus reducing the burden on the filter cotton 18c. Compared with the existing technology that connects the air inlet of the oil separator core to the air outlet of the oil-gas tank through a pipe, where oil droplets condense inside the pipe and repeatedly mix with the gas, this invention can effectively recover oil droplets, achieve better oil-gas separation, and reduce the burden on the filter cotton 18c.

[0084] To facilitate the processing of the air guide 2c and reduce processing costs, the air guide 2c is made of plastic and is injection molded; to facilitate the processing of the end cap 2b, the end cap 2b is cast.

[0085] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An oil draining structure for an air compressor, comprising a compressor head, an oil-gas separator, a filter, and a cooling pipe, wherein one end of the cooling pipe is connected to the oil-gas separator and the other end is connected to the filter, the filter is connected to the compressor head via a pipe, and the compressor head is connected to the oil-gas separator via a pipe, characterized in that: It also includes a mounting base on which the oil change cap or the filter can be installed. The mounting base is provided with an oil inlet channel, an oil outlet channel, and a mounting groove. The mounting groove has an oil inlet connecting to the oil inlet channel and an oil outlet connecting to the oil outlet channel. In the draining state, the oil change cap is installed on the mounting groove. The inner cavity of the oil change cap connects the oil inlet and the oil outlet. The gas introduced into the oil change cap is divided into two parts. One part of the gas flows into the oil-gas tank through the oil inlet, the oil inlet channel, and the cooling pipe. The other part of the gas flows into the oil-gas tank through the oil outlet, the oil outlet channel, the pipe connecting the filter and the machine head, the machine head, and the pipe connecting the machine head and the oil-gas tank. The oil outlet is provided with a connector. The end of the connector away from the oil outlet is... The oil change cap has a hollow external threaded post. The oil change cap includes a cover that covers the mounting groove. The cover has an air inlet. The cover has an internal threaded post that is fitted onto the external threaded post. The inner hole of the internal threaded post is connected to the air inlet. The side wall of the internal threaded post has a connecting hole that connects the inner hole of the internal threaded post to the inner cavity of the cover. Part of the gas introduced into the air inlet flows into the oil outlet, and the other part of the gas flows into the oil inlet through the connecting hole and the inner cavity of the cover. Before injecting gas into the oil change cap, the oil separator core installed on the oil-gas tank is loosened. The gas pushes the lubricating oil in the engine head, the cooling pipe, the pipe connecting the engine head and the oil-gas tank, and the pipe connecting the filter and the engine head into the oil-gas tank and then flows out from the pipe joint of the oil separator core.

2. The oil draining structure of an air compressor according to claim 1, characterized in that: The outer side of the cover is provided with a connecting pipe that connects to the air inlet. The connecting hole is an elongated notch arranged along the axial direction of the internal thread column. The depth of the elongated notch is greater than the depth to which the external thread column enters the internal thread column.

3. The oil draining structure of an air compressor according to claim 1, characterized in that: The oil and gas tank includes a tank body with an opening at the top and an end cap located above the tank body. A flow guide shroud connected to the end cap is provided inside the tank body. An annular channel is formed between the tank body and the flow guide shroud. The mounting base is the end cap. An air inlet channel one is provided on the end cap. An air inlet channel two is provided on the flow guide shroud, which connects the air inlet channel one and the annular channel.

4. The oil draining structure of an air compressor according to claim 3, characterized in that: The end cap is equipped with an oil separator core. When the oil is drained, the pipe joint of the oil separator core is loosened, and the gas introduced into the oil change cap flows out from the gap between the pipe joint and the end cap after passing through various components.

5. The oil draining structure of an air compressor according to claim 4, characterized in that: The oil separator also includes an outer cover, filter cotton, and an air guide tube. The filter cotton divides the inner cavity of the outer cover into an air inlet chamber and an air outlet chamber. The upper end of the air guide tube is located in the air outlet chamber and communicates with it. The lower end of the air guide tube is located in the pipe joint. An oil outlet gap is left between the air guide tube and the pipe joint. The outer cover is provided with an air inlet hole that communicates with the air inlet chamber. The end cap is also provided with an air outlet channel one, an air outlet channel two, and an oil outlet hole. The air outlet channel one communicates with the inner cavity of the barrel and the air inlet hole. The air outlet channel two communicates with the lower end of the air guide tube. The oil outlet hole communicates with the oil outlet gap.

6. An oil draining method comprising the oil draining structure of an air compressor according to any one of claims 1-5, characterized in that: Includes the following steps: Step 1: Remove the filter; Step 2: Install the oil change cap where the filter was originally installed; Step 3: Inject gas into the oil change cap. The gas will push the lubricating oil in the engine head, cooling pipes, pipes connecting the engine head and the oil-gas tank, and pipes connecting the filter and the engine head into the oil-gas tank. Step 4: Stop gas injection and open the drain port of the oil-gas tank to discharge lubricating oil.

7. The oil draining method according to claim 6, characterized in that: In step one, before removing the filter, run the air compressor for a period of time and then turn it off, and wait for a while before removing the filter.

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