CN115234489B - Oil return preventing device for rotary vane vacuum pump - Google Patents
Oil return preventing device for rotary vane vacuum pump Download PDFInfo
- Publication number
- CN115234489B CN115234489B CN202210983255.9A CN202210983255A CN115234489B CN 115234489 B CN115234489 B CN 115234489B CN 202210983255 A CN202210983255 A CN 202210983255A CN 115234489 B CN115234489 B CN 115234489B
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- China
- Prior art keywords
- oil
- vacuum pump
- air inlet
- annular
- piston rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003921 oil Substances 0.000 claims abstract description 129
- 238000007599 discharging Methods 0.000 claims abstract description 20
- 230000000903 blocking effect Effects 0.000 claims abstract description 14
- 230000002265 prevention Effects 0.000 claims abstract description 7
- 238000005192 partition Methods 0.000 claims description 41
- 238000007789 sealing Methods 0.000 claims description 30
- 238000009434 installation Methods 0.000 claims description 20
- 238000001125 extrusion Methods 0.000 claims description 11
- 239000010727 cylinder oil Substances 0.000 claims description 4
- 238000000638 solvent extraction Methods 0.000 claims description 3
- 230000000151 anti-reflux effect Effects 0.000 claims 1
- 239000010724 circulating oil Substances 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention discloses an oil return prevention device for a rotary vane vacuum pump, which relates to the field of rotary vane vacuum pumps and comprises a blocking head, a piston rod, a blocking piece, a control piece and an oil discharge channel, wherein the blocking piece is used for blocking between an oil delivery pipe and an air inlet; the oil is separated between the oil delivery pipe and the air inlet through the separation piece, and meanwhile under the action of the oil discharging channel, when the air inlet of the vacuum pump is closed, if the vacuum pump returns oil, the oil can be drained to the oil leakage hole of the cylinder barrel through the oil discharging channel, and finally the oil flows into the circulating oil system of the vacuum pump through the oil leakage hole of the cylinder barrel, so that the condition that the oil enters into the vacuum environment of the vacuum pump is effectively avoided, and the vacuum environment is polluted.
Description
Technical Field
The invention relates to the field of rotary vane vacuum pumps, in particular to an oil return preventing device for a rotary vane vacuum pump.
Background
In daily life, a rotary vane vacuum pump can provide a vacuum environment for a certain space, and thus is widely used. Generally, the whole vacuumizing process needs to keep the vacuum environment clean and sanitary, the traditional method is to separate the vacuum environment from the air inlet of the rotary vane pump by utilizing the piston and the valve plate at the moment of stopping the rotary vane vacuum pump, but the traditional oil return prevention device has the possibility of sealing failure of a piston rod sealing ring, and the sealing failure can cause the rotary vane vacuum pump at the working state or the moment of stopping the pump to generate oil return phenomenon, so that oil enters the vacuum environment, thereby polluting the vacuum environment.
Disclosure of Invention
The invention aims to solve the problems and designs an oil return preventing device for a rotary vane vacuum pump.
The invention realizes the above purpose through the following technical scheme:
a prevent returning oily device for rotating vane type vacuum pump, the air inlet department of vacuum pump is provided with the installation cavity, prevents returning oily device and installs in the installation cavity, and the opening of the oil delivery pipe of vacuum pump and cylinder oil leak hole all are located the installation cavity, prevent returning oily device and include:
a blocking head;
a piston rod; the plugging head is arranged at the first end of the piston rod, and the piston rod is arranged in the mounting cavity;
a partition member; the partition piece is used for partitioning between the oil delivery pipe and the air inlet;
a control member; the control piece is used for controlling the piston rod to move in the axial direction of the air inlet, when the air inlet of the vacuum pump is opened, the distance between the blocking head and the first end of the air inlet of the vacuum pump is larger than zero, and when the air inlet of the vacuum pump is closed, the blocking head is in extrusion contact with the first end of the air inlet of the vacuum pump;
an oil discharge channel; when discharging oil returned from the oil tank, the oil inlet and the oil outlet of the oil discharging channel are respectively communicated with the oil outlet of the oil conveying pipe and the oil leakage hole of the cylinder barrel.
The invention has the beneficial effects that: the oil is separated between the oil delivery pipe and the air inlet through the separation piece, and meanwhile under the action of the oil discharging channel, when the air inlet of the vacuum pump is closed, if the vacuum pump returns oil, the oil can be drained to the oil leakage hole of the cylinder barrel through the oil discharging channel, and finally the oil flows into the circulating oil system of the vacuum pump through the oil leakage hole of the cylinder barrel, so that the condition that the oil enters into the vacuum environment of the vacuum pump is effectively avoided, and the vacuum environment is polluted.
Drawings
FIG. 1 is a schematic view of the structure of an installation cavity in an oil return prevention device for a rotary vane vacuum pump of the present invention;
FIG. 2 is a schematic view of a partition panel in an anti-oil return device of a rotary vane vacuum pump according to the present invention;
FIG. 3 is a schematic cross-sectional view of an anti-oil return device for a rotary vane vacuum pump according to the present invention;
FIG. 4 is an enlarged schematic view of the portion A;
wherein corresponding reference numerals are as follows:
1-air inlet, 2-air inlet cover, 3-opening, 4-oil delivery pipe, 5-mounting step, 6-screw hole, 7-cylinder, 8-cylinder oil leakage hole, 9-third limit groove, 10-plug, 11-mounting plate, 12-annular pressure plate, 13-piston sealing ring, 14-return spring, 15-rubber sealing bag, 16-piston head, 17-oil discharge hole, 18-ball head, 19-first screw, 20-second screw, 21-partition plate, 22-annular baffle, 23-second limit groove, 24-piston rod, 25-oil inlet, 26-oil discharge channel, 27-partition plate sealing ring, 28-shaft sleeve, 29-oil outlet, 30-first limit groove, 31-sealing screw, 32-annular bump, 33-sealing gasket, 34-baffle spring.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the inventive product is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, terms such as "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The following describes specific embodiments of the present invention in detail with reference to the drawings.
As shown in fig. 1, fig. 2, fig. 3, fig. 4, an oil return preventing device for a rotary vane vacuum pump is provided with an installation cavity at an air inlet 1 of the vacuum pump, the oil return preventing device is installed in the installation cavity, an opening 3 of an oil delivery pipe 4 of the vacuum pump and a cylinder oil leakage hole 8 are both positioned in the installation cavity, and the oil return preventing device comprises:
a stopper 10; the blocking head 10 is a sucker;
a piston rod 24; the blocking head 10 is arranged at the first end of the piston rod 24, the piston rod 24 is arranged in the installation cavity, and the sucker is positioned below the air inlet 1 on the air inlet cover 2 and is movably connected with the ball head 18 at the upper part of the piston rod 24;
a partition member; the partition piece is used for partitioning between the oil delivery pipe 4 and the air inlet 1;
a control member; the control piece is used for controlling the piston rod 24 to move in the axial direction of the air inlet 1, when the air inlet 1 of the vacuum pump is opened, the distance between the blocking head 10 and the first end of the air inlet 1 of the vacuum pump is larger than zero, and when the air inlet 1 of the vacuum pump is closed, the blocking head 10 is in extrusion contact with the first end of the air inlet 1 of the vacuum pump;
an oil discharge passage 26; when discharging oil returned from the cylinder, the oil inlet 25 and the oil outlet 29 of the oil discharging channel 26 are respectively communicated with the oil outlet 29 of the oil conveying pipe 4 and the oil leakage hole 8 of the cylinder.
The partition member includes:
a partition plate 21; the installation cavity is internally provided with an installation step 5, the partition plate 21 is fixedly connected with the installation step 5, the partition plate 21 is provided with an installation hole, the piston rod 24 is installed in the installation hole, the opening 3 of the oil delivery pipe 4 is positioned below the partition plate 21, when the air inlet 1 of the vacuum pump is closed, the height of the oil inlet 25 of the oil discharge channel 26 is higher than that of the partition plate 21, and the position of the installation cavity below the installation step 5 is a cylinder 7;
a rubber seal bag 15;
a mounting plate 11; the mounting plate 11 is fixedly mounted on the piston rod 24;
two pressing members; the rubber seal bag 15 is fixed at both ends to the mounting plate 11 and the partition plate 21 by two pressing members, respectively.
Each pressing piece comprises an annular convex block 32 and an annular pressure plate 12, the annular convex blocks 32 of the two pressing pieces are respectively arranged on the partition plate 21 and the mounting plate 11, an annular groove is formed in the annular pressure plate 12, the two annular pressure plates 12 are respectively fixedly arranged on the partition plate 21 and the mounting plate 11, the annular convex blocks 32 are positioned in the annular grooves, and the inner side wall and the outer side wall of the rubber sealing bag 15 are respectively in extrusion contact with the annular convex blocks 32 and the annular grooves.
The oil discharge channel 26 is arranged inside the piston rod 24, and the oil inlet 25 and the oil outlet 29 of the oil discharge channel 26 are both positioned on the side wall of the piston rod 24.
The control member includes an opening member for driving the piston rod 24 to move in a direction away from the intake port 1, and a closing member for driving the piston rod 24 to move in a direction toward the intake port 1.
The opening member includes:
an annular baffle 22; the annular baffle plate 22 is movably arranged on the side wall of the piston rod 24, the opening 3 of the oil delivery pipe 4 is positioned between the annular baffle plate 22 and the partition plate 21, and the side wall of the annular baffle plate 22 is contacted with the side wall of the installation cavity;
a piston head 16; the piston head 16 is fixedly arranged on the side wall of the piston rod 24, a sealing groove is arranged on the piston head 16, the piston head 16 is positioned below the annular baffle 22, an oil drain hole 17 is arranged on the piston head 16, and the oil drain hole 17 is positioned between an oil outlet 29 of the oil discharge channel 26 and the cylinder barrel oil drain hole 8;
a piston seal 13; the piston sealing ring 13 is sleeved in the sealing groove, the piston sealing ring 13 is in extrusion contact with the side wall of the mounting cavity, when the air inlet 1 of the vacuum pump is opened, the annular baffle 22 seals the oil outlet 29 of the oil discharging channel 26, and when the air inlet 1 of the vacuum pump is closed, the height of the oil outlet 29 of the oil discharging channel 26 is lower than the height of the lower surface of the annular baffle 22;
a first elastic member; the two spring-acting ends of the first spring element act on the annular flap 22 and the piston head 16, respectively.
The closure member comprises a second resilient member with two resiliently acting ends acting on the mounting cavity and the piston head 16, respectively.
The first elastic piece is a baffle spring 34, a first limit groove 30 is formed in the upper end of the piston head 16, two ends of the baffle spring 34 are respectively in extrusion contact with the annular baffle 22 and the first limit groove 30, and when an air inlet of the vacuum pump is opened, the baffle spring 34 is in a compressed state.
The second elastic piece is a return spring 14, a second limit groove 23 is formed in the lower end of the piston head 16, a third limit groove 9 is formed in the lower end of the mounting cavity, two ends of the return spring 14 are respectively in extrusion contact with the second limit groove 23 and the third limit groove 9, and when an air inlet of the vacuum pump is opened, the return spring 14 is in a compressed state.
The working principle of the oil return prevention device for the rotary vane vacuum pump is as follows:
the partition plate 21 is fixedly connected with the screw hole 6 of the mounting step 5 through the matching of the screw, the sealing gasket 33 is arranged between the partition plate 21 and the mounting step 5, the center of the partition plate 21 is provided with a mounting hole, the inside of the mounting hole is provided with the partition plate sealing ring 27 and the shaft sleeve 28, the piston rod 24 is in penetrating fit with the partition plate sealing ring 27 and the shaft sleeve 28, the rubber sealing bag 15 is positioned between the mounting plate 11 and the partition plate 21, the upper port of the rubber sealing bag 15 is attached to the upper surface of the mounting plate 11 and is tightly pressed and fixed with the first screw 19 through the annular pressure plate 12, the lower port of the rubber sealing bag 15 is covered on the annular bump 32 on the upper surface of the partition plate 21 and is tightly pressed and sealed and fixed with the second screw 20 through the annular pressure plate 12, the annular baffle 22 is arranged between the partition plate 21 and the piston head 16 and can slide on the piston rod 24, the baffle spring 34 is arranged on the lower end face of the annular baffle 22, the baffle spring 34 is in penetrating fit with the piston rod 24, the lower end of the baffle spring 34 is arranged in the first limit groove 30 on the upper end face of the piston head 16, the piston sealing ring 13 is arranged on the side face of the piston head 16, the piston head 16 with the piston sealing ring 13 can slide up and down in the cylinder barrel 7, the oil drain hole 17 penetrating through the end face is drilled on the end face of the piston head 16, the second limit groove 23 is arranged on the lower end face of the piston head 16, the second limit groove 23 can be matched with the upper part of the return spring 14, and the lower end of the return spring 14 can be matched with the third limit groove 9.
When the baffle spring 34 and the return spring 14 are in a non-compressed state, namely when the rotary vane vacuum pump is closed, the sucker is attached and sealed with the lower end of the air inlet 1, the upper surface of the annular baffle 22 is flush with the upper end of the cylinder barrel 7, the oil inlet 25 is above the horizontal plane of the upper surface of the partition plate 21, and the oil outlet 29 is below the horizontal plane of the lower surface of the annular baffle 22. Therefore, when the oil return phenomenon occurs due to sealing failure, oil enters the mounting cavity from the opening 3 of the oil delivery pipe 4 of the vacuum pump, passes through the space between the shaft sleeve 28 and the piston rod 24 at the mounting hole of the partition plate 21, and enters the rubber sealing bag 15, at the moment, the oil returned from the rubber sealing bag 15 can smoothly flow into the oil inlet 25 and flow out of the oil outlet 29 through the oil discharging channel 26, then flows into the bottom of the cylinder barrel 7 through the oil discharging hole 17, and finally flows into the circulating oil system of the rotary vane vacuum pump through the cylinder barrel oil leakage hole 8.
When the baffle spring 34 and the return spring 14 are in a compressed state, namely, when the rotary vane vacuum pump is started, the sucker is disconnected with the lower end of the air inlet 1, and the oil delivery pipe 4 conveys pressure oil to the space between the partition plate 21 and the annular baffle 22 through the opening 3, so that the annular baffle 22 slides downwards to compress the baffle spring 34 and the return spring 14, and at the moment, the oil inlet 25 is below the horizontal plane of the lower surface of the partition plate 21, and the oil inlet 25 is covered by the annular baffle 22. Therefore, the stability of the oil pressure of the oil return prevention box device is ensured, and the rotary vane vacuum pump can smoothly and stably vacuumize.
The technical scheme of the invention is not limited to the specific embodiment, and all technical modifications made according to the technical scheme of the invention fall within the protection scope of the invention.
Claims (6)
1. A prevent returning oily device for rotating vane type vacuum pump, its characterized in that, vacuum pump's air inlet department is provided with the installation cavity, prevents returning oily device and installs in the installation cavity, and vacuum pump's oil delivery pipe's opening and cylinder oil leak hole all are located the installation cavity, prevent returning oily device and include:
a blocking head;
a piston rod; the plugging head is arranged at the first end of the piston rod, and the piston rod is arranged in the mounting cavity;
a partition member; the partition piece is used for partitioning between the oil delivery pipe and the air inlet;
a control member; the control piece is used for controlling the piston rod to move in the axial direction of the air inlet, when the air inlet of the vacuum pump is opened, the distance between the blocking head and the first end of the air inlet of the vacuum pump is larger than zero, and when the air inlet of the vacuum pump is closed, the blocking head is in extrusion contact with the first end of the air inlet of the vacuum pump;
an oil discharge channel; when discharging oil returned from the oil tank, the oil inlet and the oil outlet of the oil discharging channel are respectively communicated with the oil outlet of the oil conveying pipe and the oil leakage hole of the cylinder barrel;
the partition member includes:
a partition panel; the mounting cavity is internally provided with a mounting step, the partition plate is fixedly connected with the mounting step, the partition plate is provided with a mounting hole, the piston rod is mounted in the mounting hole, the opening of the oil delivery pipe is positioned below the partition plate, the oil discharging channel is arranged inside the piston rod, the oil inlet and the oil outlet of the oil discharging channel are both positioned on the side wall of the piston rod, and when the air inlet of the vacuum pump is closed, the height of the oil inlet of the oil discharging channel is higher than that of the partition plate;
a rubber seal bag;
a mounting plate; the mounting plate is fixedly arranged on the piston rod;
two pressing members; two ends of the rubber sealing bag are respectively fixed on the mounting plate and the partition plate through two pressing pieces;
the control member comprises an opening member and a closing member, the opening member is used for driving the piston rod to move towards the direction far away from the air inlet, and the closing member is used for driving the piston rod to move towards the direction close to the air inlet.
2. The oil return prevention device for a rotary vane vacuum pump according to claim 1, wherein each pressing member comprises an annular projection and an annular pressure plate, the annular projections of the two pressing members are respectively arranged on the partition plate and the mounting plate, an annular groove is formed in the annular pressure plate, the two annular pressure plates are respectively fixedly arranged on the partition plate and the mounting plate, the annular projections are positioned in the annular grooves, and the inner side wall and the outer side wall of the rubber sealing bag are respectively in extrusion contact with the annular projections and the annular grooves.
3. The oil return prevention device for a rotary vane vacuum pump according to claim 1, wherein the opening member comprises:
an annular baffle; the annular baffle is movably arranged on the side wall of the piston rod, an opening of the oil delivery pipe is positioned between the annular baffle and the partition plate, and the side wall of the annular baffle is contacted with the side wall of the installation cavity;
a piston head; the piston head is fixedly arranged on the side wall of the piston rod, a sealing groove is arranged on the piston head, the piston head is positioned below the annular baffle, an oil drain hole is arranged on the piston head, and the oil drain hole is positioned between an oil outlet of the oil discharging channel and the oil drain hole of the cylinder barrel;
a piston seal ring; the piston sealing ring is sleeved in the sealing groove, the piston sealing ring is in extrusion contact with the side wall of the mounting cavity, when the air inlet of the vacuum pump is opened, the annular baffle plate seals the oil outlet of the oil discharging channel, and when the air inlet of the vacuum pump is closed, the height of the oil outlet of the oil discharging channel is lower than the height of the lower surface of the annular baffle plate;
a first elastic member; the two elastic action ends of the first elastic piece respectively act on the annular baffle plate and the piston head.
4. An anti-reflux device for a rotary vane vacuum pump according to claim 1, wherein the closure member comprises a second resilient member having two resiliently acting ends acting on the mounting cavity and the piston head, respectively.
5. The oil return preventing device for a rotary vane vacuum pump of claim 3, wherein the first elastic member is a baffle spring, the upper end of the piston head is provided with a first limit groove, two ends of the baffle spring are respectively in extrusion contact with the annular baffle and the first limit groove, and the baffle spring is in a compressed state when an air inlet of the vacuum pump is opened.
6. The oil return preventing device for a rotary vane vacuum pump of claim 4, wherein the second elastic member is a return spring, the lower end of the piston head is provided with a second limit groove, the lower end of the mounting cavity is provided with a third limit groove, two ends of the return spring are respectively in extrusion contact with the second limit groove and the third limit groove, and the return spring is in a compressed state when the air inlet of the vacuum pump is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210983255.9A CN115234489B (en) | 2022-08-16 | 2022-08-16 | Oil return preventing device for rotary vane vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210983255.9A CN115234489B (en) | 2022-08-16 | 2022-08-16 | Oil return preventing device for rotary vane vacuum pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115234489A CN115234489A (en) | 2022-10-25 |
| CN115234489B true CN115234489B (en) | 2023-10-31 |
Family
ID=83680129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210983255.9A Active CN115234489B (en) | 2022-08-16 | 2022-08-16 | Oil return preventing device for rotary vane vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115234489B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57165691A (en) * | 1981-04-03 | 1982-10-12 | Hitachi Ltd | Vacuum pump directly coupled to generator shaft |
| JPH048896A (en) * | 1990-04-25 | 1992-01-13 | Hitachi Ltd | Vacuum pump |
| CN206608314U (en) * | 2017-03-23 | 2017-11-03 | 成都南光机器有限公司 | The associated mode vavuum pump of deadweight safety valve is set at a kind of air inlet |
-
2022
- 2022-08-16 CN CN202210983255.9A patent/CN115234489B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57165691A (en) * | 1981-04-03 | 1982-10-12 | Hitachi Ltd | Vacuum pump directly coupled to generator shaft |
| JPH048896A (en) * | 1990-04-25 | 1992-01-13 | Hitachi Ltd | Vacuum pump |
| CN206608314U (en) * | 2017-03-23 | 2017-11-03 | 成都南光机器有限公司 | The associated mode vavuum pump of deadweight safety valve is set at a kind of air inlet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115234489A (en) | 2022-10-25 |
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