Automatic oil return device

Abstract

The utility model provides an automatic oil return device which solves the problems that in the prior art, an automatic oil return device lacks an effective control structure, when a compressor is in a load-reducing state and lubricating oil in an oil collecting barrel is rapidly pumped out, a main engine of the compressor still continues to pump the lubricating oil which does not exist in the oil collecting barrel, and the working efficiency is high. And normal operation of the compressor is damaged due to the fact that air which is not filtered is extracted. The utility model provides an automatic oil return device which comprises an oil tank, an oil pumping pipe, a normally open stop valve and a suction assembly, the oil inlet end of the oil pumping pipe is connected with the oil tank, the oil outlet end of the oil pumping pipe is connected with an air suction low-pressure cavity of a main machine through the normally open stop valve and a vacuum generator of the suction assembly, and the normally open stop valve is connected with an electromagnetic valve of the suction assembly. When the electromagnetic valve loses power, the normally-open stop valve is closed under the action of gas through gas path switching, the oil pumping pipe is blocked, and the compressor main machine is prevented from continuously pumping non-existing lubricating oil or unfiltered air.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field especially is related to an automatic oil return device. BACKGROUND

[0002] The host is the key part of the air compressor, and the reliability and stability of the host matched with the air compressor in the shaft seal directly affect the continuous and stable operation of the air compressor. However, there are still some technical defects in the shaft seal of the host in China at present, especially in the design, material selection, assembly process, and processing precision and tolerance matching of related parts, which leads to the phenomenon of host shaft seal oil leakage after the air compressor runs for a certain time.

[0003] Further, the application number CN202321443583.6 discloses an automatic oil return system for air compressor. Through the cooperation of the oil collecting assembly and the suction assembly, the oil leaked from the host shaft seal of the air compressor is returned to the compression chamber at the suction end of the host, forming an oil circuit to recycle the oil leaked from the host shaft seal, ensuring that the air compressor will not run out of oil due to leakage and avoiding adverse phenomena such as air compressor oil shortage high temperature alarm shutdown, overcoming the defects of host shaft seal oil leakage and difficulty in replacing the host shaft seal oil leakage in the prior art.

[0004] However, there are still the following technical problems: lack of effective control structure, when the compressor is in a reduced load state, the lubricating oil in the oil collecting bucket is quickly extracted, and the host of the compressor will continue to extract the non-existent lubricating oil in the oil collecting bucket, and extract the unfiltered air, which causes damage to the normal operation of the compressor.

[0005] Therefore, the utility model is proposed. UTILITY MODEL CONTENT

[0006] The utility model aims at providing an automatic oil return device to solve the technical problem of lack of effective control structure in the prior art, when the compressor is in a reduced load state, the lubricating oil in the oil collecting bucket is quickly extracted, and the host of the compressor will continue to extract the non-existent lubricating oil in the oil collecting bucket, and extract the unfiltered air, which causes damage to the normal operation of the compressor. The preferred technical solutions in the many technical solutions provided by the utility model can produce many technical effects, which are described below.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0008] The utility model provides an automatic oil return device, including oil tank, oil suction pipe, always open stop valve and suction subassembly, the oil inlet end of oil suction pipe is connected with oil tank, the oil outlet end of oil suction pipe is connected with the suction low pressure cavity of host computer through always open stop valve and the vacuum generator of suction subassembly, always open stop valve is connected with the electromagnetic valve of suction subassembly.

[0009] Preferably, the suction assembly further comprises a pressure regulating filter, the pressure regulating filter, the electromagnetic valve and the vacuum generator are sequentially connected along the airflow direction; the pressure regulating filter is in communication with the air outlet pipe of the compressor oil gas cylinder; the air outlet end of the vacuum generator is connected with the suction low pressure cavity of the host computer.

[0010] Preferably, the air outlet end of the vacuum generator is provided with a one-way valve.

[0011] Preferably, it further comprises an oil inlet pipe, the oil tank is provided with a first oil cavity, a second oil cavity and a third oil cavity arranged in sequence in communication along the lubricating oil flow direction; the oil inlet end of the oil inlet pipe is in communication with the oil return port of the compressor host computer shaft seal, the oil outlet end of the oil inlet pipe is in communication with the first oil cavity; the oil inlet end of the oil suction pipe is placed in the third oil cavity.

[0012] Preferably, the distance between the oil inlet end of the oil suction pipe and the bottom surface of the third oil cavity is 5mm.

[0013] Preferably, a dustproof filter vent cap is arranged on the oil tank corresponding to the position of the second oil cavity.

[0014] Preferably, a Y-shaped filter screen is arranged on the oil inlet pipe.

[0015] Preferably, a floating ball type liquid level sensor is arranged in the third oil cavity, the floating ball type liquid level sensor is connected with the intermediate relay of the compressor, and the electromagnetic valve is electrically connected with the intermediate relay.

[0016] The preferred technical scheme of the utility model can at least produce the following technical effects:

[0017] The utility model effectively avoids the lack of effective control structure of automatic oil return device in the prior art, when the compressor is in the load reduction state, the lubricating oil in the oil collecting barrel is rapidly extracted, the host of the compressor will continue to extract the non-existing lubricating oil in the oil collecting barrel and the unfiltered air, which causes damage to the normal operation of the compressor. The utility model provides an automatic oil return device, including oil tank, oil extraction pipe, always open stop valve and suction assembly, the oil inlet end of oil extraction pipe is connected with oil tank, the oil outlet end of oil extraction pipe is connected with the air suction low pressure cavity of host through the vacuum generator of always open stop valve and suction assembly, always open stop valve is connected with the electromagnetic valve of suction assembly. Through the always open stop valve is additionally arranged at the oil outlet end of oil extraction pipe, when the electromagnetic valve loses electricity, through the gas path switching, the always open stop valve is closed under the action of gas, the oil extraction pipe is not connected, preventing the host of the compressor from continuing to extract the non-existing lubricating oil or the unfiltered air. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0019] Figure 1 It is the structure schematic diagram of an automatic oil return device provided by the utility model.

[0020] In the drawing:

[0021] 1, oil tank;101, first oil cavity;102, second oil cavity;103, third oil cavity;104, first oil guide hole;105, second oil guide hole;

[0022] 2, suction assembly;201, pressure regulating filter;202, electromagnetic valve;203, vacuum generator;204, check valve;

[0023] 3, oil extraction pipe;4, always open stop valve;5, floating ball type liquid level sensor;501, upper floating ball;502, lower floating ball;503, insertion rod;

[0024] 6, oil inlet pipe;7, Y type filter screen;8, dustproof filter breather cap. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope protected by the utility model.

[0026] As shown in Figure 1 The utility model provides an automatic oil return device, including oil tank 1, oil extraction pipe 3, always open stop valve 4 and suction assembly 2, the oil inlet end of oil extraction pipe 3 is connected with oil tank 1, the oil outlet end of oil extraction pipe 3 is connected with the suction low pressure chamber of host computer through always open stop valve 4 and the vacuum generator 203 of suction assembly 2, always open stop valve 4 is connected with the electromagnetic valve 202 of suction assembly 2.

[0027] When the electromagnetic valve 202 loses electricity, through the gas switching, always open stop valve 4 is closed under the action of gas, and oil extraction pipe 3 is not connected, to prevent the compressor host computer from continuing to extract non-existent lubricating oil or unfiltered air.

[0028] As an optional embodiment, the suction assembly 2 further comprises a pressure regulating filter 201, the pressure regulating filter 201, the electromagnetic valve 202 and the vacuum generator 203 are sequentially connected along the airflow direction; the pressure regulating filter 201 is in communication with the air outlet pipe of the compressor oil cylinder; and the air outlet end of the vacuum generator 203 is connected with the suction low pressure chamber of the host computer.

[0029] The pressure regulating filter 201 functions to regulate the pressure of the gas circuit and provide the gas circuit with gas of appropriate pressure.

[0030] The electromagnetic valve 202 comprises a two-position five-way electromagnetic valve 202. During the oil extraction process, the electromagnetic valve 202 is powered on to supply gas to the vacuum generator 203, and the vacuum generator 203 is actuated, at the same time, the control gas source of the always open stop valve 4 is cut off, so that the always open stop valve 4 is kept in an open state under the action of gas pressure and lubricating oil is allowed to pass through. The vacuum generator 203 extracts lubricating oil in the third oil chamber 103 through the oil extraction pipe 3, flows through the check valve 204 and enters the suction low pressure chamber of the host computer.

[0031] When the lubricating oil in the oil tank 1 is insufficient or the electromagnetic valve 202 loses electricity, the always open stop valve 4 is closed under the action of gas, and the oil extraction operation is stopped, to avoid the compressor from continuing to extract non-existent lubricating oil or air.

[0032] As an optional embodiment, the air outlet end of the vacuum generator 203 is provided with a check valve 204.

[0033] The check valve 204 functions to prevent lubricating oil from flowing back into the oil collecting barrel when the machine is stopped and reversed.

[0034] As an optional implementation, the oil tank 1 is provided with the first oil cavity 101, the second oil cavity 102 and the third oil cavity 103 which are sequentially communicated along the lubricating oil flow direction; the oil inlet end of the oil inlet pipe 6 is communicated with the oil return port of the compressor main shaft seal, the oil outlet end of the oil inlet pipe 6 is communicated with the first oil cavity 101; the oil inlet end of the oil suction pipe 3 is arranged in the third oil cavity 103.

[0035] Further, the first oil cavity 101 and the second oil cavity 102 are provided with the first oil guide hole 104, the second oil cavity 102 and the third oil cavity 103 are provided with the second oil guide hole 105, and the distance between the second oil guide hole 105 and the bottom surface of the oil tank 1 is greater than the distance between the first oil guide hole 104 and the bottom surface of the oil tank 1.

[0036] In this way, the lubricating oil first flows into the first oil cavity 101, accumulates in the first oil cavity 101, and when a certain amount is reached, flows into the second oil cavity 102 through the first oil guide hole 104, accumulates in the second oil cavity 102, and when a certain amount is reached, flows into the third oil cavity 103 through the second oil guide hole 105. The third oil cavity 103 accumulates a certain amount of oil before starting the suction assembly 2.

[0037] As an optional implementation, the distance between the oil inlet end of the oil suction pipe 3 and the bottom surface of the third oil cavity 103 is 5mm.

[0038] In this way, the oil suction pipe 3 can smoothly suck the lubricating oil in the third oil cavity 103.

[0039] As an optional implementation, the dustproof filter air cap 8 is arranged on the oil tank 1 corresponding to the position of the second oil cavity 102.

[0040] The dustproof filter air cap 8 balances the internal pressure of the oil tank 1 with the atmospheric pressure, so that the lubricating oil can flow into the oil tank 1 more smoothly, and at the same time, prevents dust and other impurities from the external environment from entering.

[0041] As an optional implementation, the Y-shaped filter screen 7 is arranged on the oil inlet pipe 6.

[0042] The Y-shaped filter screen 7 plays a role in filtering the lubricating oil before it enters the oil tank 1. Compared with the prior art of arranging an oil filter in the first oil cavity 101, the design of the utility model can reduce the pollution of the inside of the oil tank 1.

[0043] As an optional implementation, the third oil cavity 103 is provided with a floating ball type liquid level sensor 5, the floating ball type liquid level sensor 5 is connected to the intermediate relay of the compressor, and the electromagnetic valve 202 is electrically connected to the intermediate relay.

[0044] Further, the float ball type liquid level sensor 5 comprises a plug rod 503, an upper float ball 501 and a lower float ball 502, the plug rod 503 is installed on the oil tank 1, the upper float ball 501 and the lower float ball 502 are sequentially arranged on the plug rod 503 from top to bottom, and the upper float ball 501 and the lower float ball 502 can float up and down within a certain range. The upper float ball 501 and the lower float ball 502 are both provided with magnetic attraction switches.

[0045] With the accumulation of the lubricating oil in the third oil cavity, the liquid level gradually rises, driving the lower float ball 502 to rise, when the lower float ball 502 rises to the upper limit position, the magnetic attraction switch in the lower float ball 502 is attracted. With the further rise of the liquid level, the upper float ball 501 is driven to rise. When the upper float ball 501 rises to the upper limit position, the magnetic attraction switch in the upper float ball 501 is attracted.

[0046] With the lubricating oil being pumped away from the oil tank by the oil pump, the liquid level gradually decreases, when the lower float ball 502 decreases to the lower limit position, the magnetic attraction switch in the lower float ball 502 is disconnected.

[0047] The working process of the oil circuit part of the utility model is as follows:

[0048] The lubricating oil of the oil return port of the compressor main machine shaft seal is led out through the oil inlet pipe 6, is filtered first through the Y-shaped filter screen 7, and removes impurities. The filtered lubricating oil enters the first oil cavity 101 of the oil tank 1, and is automatically flowed into the second oil cavity 102 through the first oil guide hole 104 after being deposited and accumulated to a set height. After the second oil cavity 102 is deposited and accumulated to a set height, the lubricating oil is automatically flowed into the third oil cavity 103 through the second oil guide hole 105. Since the oil level of the third oil cavity 103 is controlled by the float ball type liquid level sensor 5, when the oil level reaches the lower float ball 502, the lower float ball 502 rises, and the magnetic attraction switch in the lower float ball 502 is attracted. With the continuous rise of the oil level, when the oil level reaches the upper limit position of the upper float ball 501, the magnetic attraction switch in the upper float ball 501 is also attracted, and the signal is transmitted to the intermediate relay, and then the intermediate relay controls the electromagnetic valve 202 to act, and the oil pumping action is started. The lubricating oil in the third oil cavity 103 is pumped back to the suction low-pressure cavity of the main machine through the oil pump 3. When the oil level of the third oil cavity 103 decreases to the lower limit position of the float ball type liquid level sensor 5, the magnetic attraction switch in the lower float ball 502 is disconnected, and the signal is transmitted to the intermediate relay, and then the intermediate relay controls the electromagnetic valve 202 to act, and the oil pumping action is stopped.

[0049] The working process of the gas circuit part of the utility model is as follows:

[0050] The gas source is taken from the air outlet of the compressor oil gas cylinder, and the gas with proper pressure is provided to the gas circuit through the pressure regulating filter 201. When the upper floating ball 501 of the floating ball liquid level sensor 5 is magnetically attracted to the switch, a signal is sent to the intermediate relay. The intermediate relay controls the electromagnetic valve 202 to be powered on, allowing the gas to pass to the vacuum generator 203. The vacuum generator 203 starts to work and generates a vacuum to extract the lubricating oil in the third oil chamber 103 through the oil extraction pipe 3. At the same time, due to the state change of the electromagnetic valve 202, the gas source of the normally open stop valve 4 is controlled to be cut off, and the normally open stop valve 4 is opened under the action of gas pressure, allowing the lubricating oil to pass through.

[0051] When the oil level of the third oil chamber 103 drops to the lower limit position of the lower floating ball 502, the magnetic attraction switch in the lower floating ball 502 is disconnected, and a signal is sent to the intermediate relay. The intermediate relay controls the electromagnetic valve 202 to lose power, cutting off the gas path to the vacuum generator 203, and controlling the gas path to switch to the normally open stop valve 4. The normally open stop valve 4 is closed under the action of gas pressure, interrupting the oil circuit, and stopping the oil extraction action.

[0052] It can be understood that the same or similar parts in the above embodiments can be mutually referred to, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0053] In the description of the utility model, it needs to be explained that, unless otherwise stated, the meaning of "multiple" is two or more than two; The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0054] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; It can be mechanically connected, or it can be electrically connected; It can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0055] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "one example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0056] The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An automatic oil return device characterized by comprising: The oil tank, the oil suction pipe, the normally open stop valve and the suction assembly are included, the oil inlet end of the oil suction pipe is connected with the oil tank, the oil outlet end of the oil suction pipe is connected with the air suction low pressure cavity of the main machine through the normally open stop valve and the vacuum generator of the suction assembly, and the normally open stop valve is connected with the electromagnetic valve of the suction assembly.

2. An automatic oil return device according to claim 1, characterized in that The suction assembly further includes a pressure regulating filter, the pressure regulating filter, the electromagnetic valve and the vacuum generator are sequentially connected along the air flow direction; the pressure regulating filter is communicated with the air outlet pipe of the compressor oil gas cylinder; the air outlet end of the vacuum generator is connected with the air suction low pressure cavity of the main machine.

3. An automatic oil return device according to claim 2, characterized in that The air outlet end of the vacuum generator is provided with a one-way valve.

4. An automatic oil return device according to claim 2, wherein Further including an oil inlet pipe, the oil tank is provided with a first oil cavity, a second oil cavity and a third oil cavity which are sequentially communicated along the lubricating oil flow direction; the oil inlet end of the oil inlet pipe is communicated with the oil return port of the compressor main machine shaft seal, the oil outlet end of the oil inlet pipe is communicated with the first oil cavity; the oil inlet end of the oil suction pipe is arranged in the third oil cavity.

5. An automatic oil return device according to claim 4, characterized in that The distance between the oil inlet end of the oil suction pipe and the bottom surface of the third oil cavity is 5mm.

6. An automatic oil return device according to claim 4, wherein A dustproof filter air cap is arranged on the oil tank corresponding to the position of the second oil cavity.

7. An automatic oil return device according to claim 4, wherein A Y-shaped filter screen is arranged on the oil inlet pipe.

8. An automatic oil return device according to claim 4, wherein A floating ball type liquid level sensor is arranged in the third oil cavity, the floating ball type liquid level sensor is connected with the intermediate relay of the compressor, and the electromagnetic valve is electrically connected with the intermediate relay.

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