CN218894759U - Oil return prevention structure of oil seal vacuum pump - Google Patents
Oil return prevention structure of oil seal vacuum pump Download PDFInfo
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- CN218894759U CN218894759U CN202223383929.6U CN202223383929U CN218894759U CN 218894759 U CN218894759 U CN 218894759U CN 202223383929 U CN202223383929 U CN 202223383929U CN 218894759 U CN218894759 U CN 218894759U
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Abstract
The utility model discloses an oil return prevention structure of an oil seal vacuum pump, which belongs to the technical field of vacuum pumps and comprises a shell arranged on a pump head of the vacuum pump, wherein an air inlet communicated with a vacuum container and an air inlet channel communicated with a pump cavity of the vacuum pump are formed in the shell, a first valve body capable of cutting off/communicating the air inlet with the air inlet channel is arranged between the air inlet and the air inlet channel, and the first valve body comprises a magnetic suction block arranged at the upper part and a valve rod arranged at the lower part. The oil return prevention of the air inlet channel is realized through the first valve body, the oil return prevention of the oil way channel is realized through the second valve body, the structures of the first valve body and the second valve body are simple and feasible, and the use is convenient; the first valve body is communicated with/cut off the communicated air inlet and the air inlet channel through the mutual matching of the electromagnet assembly and the first valve body, and the control direction of the electromagnet is quick in response, so that the vacuum container is prevented from being polluted by return oil of the vacuum pump.
Description
Technical Field
The utility model belongs to the technical field of vacuum pumps, and particularly relates to an oil return preventing structure of an oil seal vacuum pump.
Background
The oil seal vacuum pump is one kind of mechanical vacuum pump, and the oil seal vacuum pump can introduce vacuum pump oil in the pump chamber when the during operation, and vacuum pump oil is used for auxiliary seal on the one hand, and on the other hand vacuum pump oil can lubricate the rotor, reduces the friction, promotes the evacuation rate of vacuum pump. However, when the vacuum pump of the oil seal vacuum pump is stopped, because the air pressure in the pump cavity is negative pressure, vacuum pump oil can be pumped into the container under various factors such as pressure difference, gravity, liquid level difference and the like, so that the container is polluted.
Aiming at the problem of oil return, the existing oil seal vacuum pump is generally provided with an oil return preventing device on an air inlet channel and/or an oil return preventing device on an oil way, such as the document of publication No. CN202157963U, the existing oil return preventing device is generally provided with an oil return preventing valve with a spring for resetting, the oil return preventing valve has a plurality of structural components and high precision requirements, meanwhile, the reset mode of the spring is difficult to respond to a stop at the first time, when the vacuum pump is stopped, the oil return cannot be prevented rapidly, and a container still has the risk of being polluted by the oil of the vacuum pump.
Disclosure of Invention
The utility model aims to provide an oil return prevention structure of an oil seal vacuum pump, which aims to solve the problem of the prior vacuum pump oil return valve in the use process.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an oil blanket vacuum pump prevent returning oily structure, includes the casing that sets up in the vacuum pump head, set up on the casing with the air inlet of vacuum container intercommunication and with the air inlet channel of vacuum pump chamber intercommunication, its characterized in that: a first valve body capable of cutting off/communicating the air inlet with the air inlet channel is arranged between the air inlet and the air inlet channel, the first valve body comprises a magnetic attraction block arranged at the upper part and a valve rod arranged at the lower part, an electromagnet assembly matched with the magnetic attraction block is arranged above the magnetic attraction block, and the valve rod is movably inserted into a first valve seat hole;
the inside second disk seat hole that still is provided with of casing, the both ends in second disk seat hole are seal structure, second disk seat hole from a left side to right pore wall on seted up in proper order with vacuum pump oil tank and vacuum pump cavity intercommunication first oil channel and second oil channel, be provided with the second valve body in the second disk seat hole, the second valve body is set up to: and when the vacuum pump is stopped, the second valve body cuts off the communication between the first oil channel and the second oil channel.
Preferably, the electromagnet assembly comprises an electromagnet and a sealing groove body matched with the magnetic attraction block.
Preferably, the valve rod is closely attached to the first valve seat hole, and an elastic backing plate is further arranged at the bottom of the first valve seat hole.
Preferably, the second valve body comprises a valve core, a reset spring and a fixed end.
Preferably, a baffle plate and a check ring are arranged on the left side of the second valve seat hole.
Preferably, a filter screen is further arranged on the air inlet.
Compared with the prior art, the utility model has the beneficial effects that:
the oil return prevention of the air inlet channel is realized through the first valve body, the oil return prevention of the oil way channel is realized through the second valve body, the structures of the first valve body and the second valve body are simple and feasible, and the use is convenient; the first valve body is communicated with/cut off the communicated air inlet and the air inlet channel through the mutual matching of the electromagnet assembly and the first valve body, and the control direction of the electromagnet is quick in response, so that the vacuum container is prevented from being polluted by return oil of the vacuum pump.
Drawings
FIG. 1 is a schematic view of a first valve body according to the present utility model;
fig. 2 is a schematic view of a second valve body according to the present utility model.
In the figure: 1. a housing; 2, an air inlet; 3. an air intake passage; 4. a first valve body; 41. a magnetic suction block; 42. a valve stem; 5. a first valve seat bore; 51. an elastic backing plate; 6. an electromagnet assembly; 7. a second valve seat bore; 71. a retainer ring; 72. a baffle; 8. a second valve body; 81. a valve core; 9. a first oil passage; 10. and a second oil passage.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-2, an oil return preventing structure of an oil seal vacuum pump comprises a shell 1 arranged on a pump head of the vacuum pump, wherein an air inlet 2 communicated with a vacuum container and an air inlet channel 3 communicated with a pump cavity of the vacuum pump are arranged on the shell 1, and the oil return preventing structure is characterized in that: a first valve body 4 capable of cutting off/communicating the air inlet 2 with the air inlet channel 3 is arranged between the air inlet 2 and the air inlet channel 3, the first valve body 4 comprises a magnetic attraction block 41 arranged at the upper part and a valve rod 42 arranged at the lower part, an electromagnet assembly 6 matched with the magnetic attraction block 41 is arranged above the magnetic attraction block 41, and the valve rod 42 is movably inserted into the first valve seat hole 5;
the inside second disk seat hole 7 that still is provided with of casing 1, the both ends of second disk seat hole 7 are seal structure, second disk seat hole 7 from left to right pore wall on seted up in proper order with vacuum pump oil tank and vacuum pump chamber intercommunication first oil channel 9 and second oil channel 10, be provided with second valve body 8 in the second disk seat hole 7, second valve body 8 is set up to: the second valve body 8 maintains communication between the first oil passage 9 and the second oil passage 10 under the vacuum pump oil pressure when the vacuum pump is operated, and cuts off communication between the first oil passage 9 and the second oil passage 10 when the vacuum pump is stopped.
Aiming at the problems of complex structure and slow response of the existing oil return prevention valve, the scheme realizes the oil return prevention of the air inlet channel 3 through the first valve body 4 and the oil return prevention of the oil way channel through the second valve body 8, wherein when the pump body is shut down, the electromagnet assembly 6 instantly turns on a circuit, thereby adsorbing the first valve body 4, cutting off the communication between the air inlet channel 3 and the air inlet 2, and avoiding the entry of vacuum pump oil into the vacuum container through the air inlet channel 3; meanwhile, the second valve body 8 cuts off the communication between the first oil channel 9 and the second oil channel 10, so that oil cannot be continuously delivered to the pump cavity, and oil return is effectively prevented.
Further, the electromagnet assembly 6 comprises an electromagnet and a sealing groove body matched with the magnetic attraction block 41.
In this scheme, seal groove body and magnetic attraction piece 41 adaptation, when the magnetic attraction piece 41 is adsorbed, guarantee that the two is inseparable, avoid returning the oil, this scheme adopts the mode response pump machine of electro-magnet to shut down, and response speed is faster to avoid vacuum pump oil to pollute the vacuum vessel.
Further, the valve stem 42 is disposed closely to the first valve seat hole 5, and the bottom of the first valve seat hole 5 is further provided with an elastic pad 51.
When the electromagnet is turned off, the first valve body 4 descends under the action of gravity, and the elastic pad 51 can buffer the impact of the first valve body 4.
Further, the second valve body 8 includes a valve spool 81, a return spring, and a fixed end.
In the use state, vacuum pump oil enters the second valve seat hole 7 from the first oil channel 9, the valve core 81 moves rightwards under the action of oil pressure, the return spring is compressed, and after the valve core 81 moves rightwards, the first oil channel 9 is communicated with the second oil channel 10 to convey oil to the inside of the pump cavity; in the shut-down state, the oil pump no longer pumps oil, and the pressure received by the return spring disappears and rebounds, thereby driving the valve element 81 to shut off the communication between the first oil passage 9 and the second oil passage 10.
Further, a baffle 72 and a retainer ring 71 are provided on the left side of the second valve seat hole 7.
Further, a filter screen is also arranged on the air inlet 2.
Working principle: when the pump body is shut down, the electromagnet assembly 6 instantly turns on a circuit, so that the first valve body 4 is adsorbed, the communication between the air inlet channel 3 and the air inlet 2 is cut off, and the vacuum pump oil is prevented from entering the vacuum container through the air inlet channel 3; in the use state, vacuum pump oil enters the second valve seat hole 7 from the first oil channel 9, the valve core 81 moves rightwards under the action of oil pressure, the return spring is compressed, and after the valve core 81 moves rightwards, the first oil channel 9 is communicated with the second oil channel 10 to convey oil to the inside of the pump cavity; in the shut-down state, the oil pump no longer pumps oil, and the pressure received by the return spring disappears and rebounds, thereby driving the valve element 81 to shut off the communication between the first oil passage 9 and the second oil passage 10.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides an oil blanket vacuum pump prevent returning oily structure, includes the casing that sets up in the vacuum pump head, set up on the casing with the air inlet of vacuum container intercommunication and with the air inlet channel of vacuum pump chamber intercommunication, its characterized in that: a first valve body capable of cutting off/communicating the air inlet with the air inlet channel is arranged between the air inlet and the air inlet channel, the first valve body comprises a magnetic attraction block arranged at the upper part and a valve rod arranged at the lower part, an electromagnet assembly matched with the magnetic attraction block is arranged above the magnetic attraction block, and the valve rod is movably inserted into a first valve seat hole;
the inside second disk seat hole that still is provided with of casing, the both ends in second disk seat hole are seal structure, second disk seat hole from a left side to right pore wall on seted up in proper order with vacuum pump oil tank and vacuum pump cavity intercommunication first oil channel and second oil channel, be provided with the second valve body in the second disk seat hole, the second valve body is set up to: and when the vacuum pump is stopped, the second valve body cuts off the communication between the first oil channel and the second oil channel.
2. The oil return prevention structure of an oil-sealed vacuum pump according to claim 1, wherein: the electromagnet assembly comprises an electromagnet and a sealing groove body matched with the magnetic attraction block.
3. The oil return prevention structure of an oil-sealed vacuum pump according to claim 1, wherein: the valve rod is closely attached to the first valve seat hole, and an elastic backing plate is further arranged at the bottom of the first valve seat hole.
4. The oil return prevention structure of an oil-sealed vacuum pump according to claim 1, wherein: the second valve body comprises a valve core, a reset spring and a fixed end.
5. The oil return prevention structure of an oil-sealed vacuum pump according to claim 1, wherein: and a baffle plate and a check ring are arranged on the left side of the second valve seat hole.
6. The oil return prevention structure of an oil-sealed vacuum pump according to claim 1, wherein: and a filter screen is further arranged on the air inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223383929.6U CN218894759U (en) | 2022-12-16 | 2022-12-16 | Oil return prevention structure of oil seal vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223383929.6U CN218894759U (en) | 2022-12-16 | 2022-12-16 | Oil return prevention structure of oil seal vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218894759U true CN218894759U (en) | 2023-04-21 |
Family
ID=86001871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223383929.6U Active CN218894759U (en) | 2022-12-16 | 2022-12-16 | Oil return prevention structure of oil seal vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218894759U (en) |
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2022
- 2022-12-16 CN CN202223383929.6U patent/CN218894759U/en active Active
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