CN115030884A - Miniature diaphragm formula electron vacuum pump - Google Patents
Miniature diaphragm formula electron vacuum pump Download PDFInfo
- Publication number
- CN115030884A CN115030884A CN202210636168.6A CN202210636168A CN115030884A CN 115030884 A CN115030884 A CN 115030884A CN 202210636168 A CN202210636168 A CN 202210636168A CN 115030884 A CN115030884 A CN 115030884A
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- China
- Prior art keywords
- diaphragm
- armature
- pump
- magnetic pole
- round pipe
- 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.)
- Pending
Links
- 230000005389 magnetism Effects 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 9
- 238000001746 injection moulding Methods 0.000 claims description 3
- 239000006247 magnetic powder Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 230000006698 induction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
- F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
- F04B45/047—Pumps having electric drive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention provides a micro diaphragm type electronic vacuum pump which comprises a pump body, a left pump cover, a right pump cover, a diaphragm, a connecting body and a driving mechanism, wherein the pump body is provided with a left pump cover and a right pump cover; the left pump cover and the interior of the pump body form an air inlet cavity, and the right pump cover and the interior of the pump body form an exhaust cavity; the middle part of the pump body is provided with a connecting flange which is annular, the middle of the connecting flange is provided with a round pipe body, the periphery of the inner side end of the round pipe body is connected with the inner side end of the connecting flange through a wall plate, and the wall plate is provided with a through hole; the diaphragm is arranged between the connecting flange and the connecting body and can seal the outer side end of the round pipe body, and a magnetic spring seat is arranged in the middle of the diaphragm; when the electromagnetic coil is electrified, the armature and the rear magnetic pole can generate magnetism, so that the diaphragm can move up and down under the action of magnetic field force and spring elasticity, and the size of a pump body of the traditional electronic diaphragm pump is effectively reduced.
Description
Technical Field
The invention relates to a micro diaphragm type electronic vacuum pump.
Background
The diaphragm type electric vacuum pump is mainly used for providing a vacuum source for vacuum assistance of automobile braking, but the common diaphragm type electric vacuum pump is basically driven by a motor, a crank connecting rod drives a diaphragm to move, and the diaphragm type electric vacuum pump is usually an independent cavity and has the defects of large volume, high noise and nonadjustable air suction rate.
Disclosure of Invention
The invention aims to provide a micro diaphragm type electronic vacuum pump with a compact structure.
In order to solve the technical problem, the technical scheme of the invention is as follows: a micro diaphragm type electronic vacuum pump comprises a pump body, a left pump cover, a right pump cover, a diaphragm, a connecting body and a driving mechanism; the left pump cover and the interior of the pump body form an air inlet cavity, and the right pump cover and the interior of the pump body form an air outlet cavity; the middle of the pump body is provided with a connecting flange, the connecting flange is annular, a round pipe body is arranged in the middle of the connecting flange, the periphery of the inner side end of the round pipe body is connected with the inner side end of the connecting flange through a wall plate, and the wall plate is provided with a through hole; the diaphragm is arranged between the connecting flange and the connecting body and can seal the outer side end of the round pipe body, and a magnetic spring seat is arranged in the middle of the diaphragm; the driving mechanism comprises a front magnetic pole, an electromagnetic coil, a rear magnetic pole, an armature, a magnetic beam tube, a main spring and a shell, wherein the front magnetic pole is a disc body with a middle shaft hole, the armature is a stepped shaft and comprises a small-diameter section and a large-diameter section, the front magnetic pole is installed on a connector, the armature is arranged in the shaft hole of the front magnetic pole in a penetrating mode, an auxiliary spring is sleeved on the small-diameter section of the armature, the other end of the auxiliary spring abuts against a spring seat in the middle of a diaphragm, the main spring is installed between the large-diameter section of the armature and the rear magnetic pole, the magnetic beam tube, the electromagnetic coil and the shell are sequentially installed from inside to outside by taking the armature and the rear magnetic pole as surrounding centers, and when the electromagnetic coil is electrified, the armature and the rear magnetic pole can both generate magnetism, so that the magnetic field force between the armature and the spring seat is greater than the elastic force of the auxiliary spring between the armature and the spring seat.
The working principle and the process of the technical scheme are as follows:
1) when the electromagnetic coil is electrified, the back magnetic pole generates magnetism, meanwhile, the armature also generates magnetism, the back magnetic pole is adsorbed by the back magnetic pole to move upwards, the shell and the magnetic bundling tube play a role in binding a magnetic induction line, because the spring seat has magnetism, the magnetic field force between the armature and the spring seat is larger than the elastic force of the auxiliary spring, at the moment, the auxiliary spring is compressed, the spring seat drives the diaphragm to move upwards, the air inlet cavity and the air outlet cavity are communicated, the cavity is expanded to generate negative pressure, and air enters the interior of the pump cavity from the outside;
2) when the electromagnetic coil is de-energized, the back magnetic pole loses magnetism, the armature loses magnetism, the main spring pushes the armature to move downwards, the auxiliary spring overcomes the magnetic force of the spring seat to push the spring seat downwards, and then the diaphragm is pushed to close the round pipe body downwards, so that the internal volume of the whole pump cavity is compressed, the gas pressure is increased, and the gas is discharged from the exhaust port.
The micro diaphragm type electronic vacuum pump provided by the invention does not need to be provided with a motor, a crank, a connecting rod and other driving mechanisms, so that the volume of a pump body of the traditional electronic diaphragm pump is effectively reduced, and meanwhile, the pumping and exhausting rate can be controlled by controlling the current frequency.
In one embodiment, the circular tube body is communicated with the air inlet cavity, and the through hole in the wall plate is communicated with the air exhaust cavity; when the diaphragm covers the outer side end of the circular tube body, the air inlet cavity and the air exhaust cavity are not communicated with each other, and when the diaphragm is opened, the air inlet cavity and the air exhaust cavity can be communicated with each other through the circular tube body and the through hole.
In one embodiment, the left pump cover is provided with an air inlet one-way valve, and the right pump cover is provided with an air outlet one-way valve.
In one embodiment, the large diameter section of the armature is provided with a mounting hole for receiving a main spring.
In one embodiment, the spring seat is formed by injection molding of magnetic powder.
In one embodiment, the on-off of the current of the electromagnetic coil and the electrifying frequency can be adjusted by the controller.
Drawings
FIG. 1 is a cross-sectional view of a vacuum pump in an embodiment of the present invention;
FIG. 2 is a schematic longitudinal sectional view of a vacuum pump in an embodiment of the present invention;
FIG. 3 is a schematic perspective exploded view of a vacuum pump according to an embodiment of the present invention;
FIG. 4 is a perspective view of a pump body according to an embodiment of the present invention;
the reference signs are:
1-bolt 2-left pump cover
3-air inlet check valve 4-pump body
4 a-connecting flange 4 b-round pipe body
4 c-Via 5-connector
6-front magnetic pole 7-shell
8-electromagnetic coil 9-rear magnetic pole
10-armature 11-beam magnetic tube
12-main spring 13-auxiliary spring
14-spring seat 15-diaphragm
16-right pump cover 17-exhaust one-way valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1 to 4, the preferred embodiment of the present invention is: a micro diaphragm type electronic vacuum pump comprises a pump body 4, a left pump cover 2, a right pump cover 16, a diaphragm 15, a connecting body 5, a bolt 1 and a driving mechanism; the left pump cover 2 and the pump body 4 form an air inlet cavity, the right pump cover 16 and the pump body 4 form an exhaust cavity, the left pump cover 2 is provided with an air inlet one-way valve 3, and the right pump cover 16 is provided with an exhaust one-way valve 17; a connecting flange 4a is arranged in the middle of the pump body 4, the connecting flange 4a is annular, a round pipe body 4b communicated with the air inlet cavity is arranged in the middle of the connecting flange 4a, the periphery of the inner side end of the round pipe body 4b is connected with the inner side end of the connecting flange 4a through a wall plate, and a through hole 4c is formed in the position, corresponding to the air exhaust cavity, of the wall plate; the diaphragm 15 is arranged between the connecting flange 4a and the connecting body 5 and can seal the outer side end of the round pipe body 4b, when the diaphragm 15 seals the outer side end of the round pipe body 4b, the air inlet cavity and the air exhaust cavity are not communicated with each other, and when the diaphragm 15 is opened, the air inlet cavity and the air exhaust cavity can be communicated with each other through the round pipe body 4b and the through hole 4 c; a spring seat 14 is arranged in the middle of the diaphragm 15, and the spring seat 14 is formed by injection molding of magnetic powder; the driving mechanism comprises a front magnetic pole 6, an electromagnetic coil 8, a rear magnetic pole 9, an armature 10, a magnetic beam tube 11, a main spring 12 and a shell 7, wherein the front magnetic pole 6 is a disk body with a middle shaft hole, the armature 10 is a stepped shaft and comprises a small-diameter section and a large-diameter section, the front magnetic pole 6 is installed on a connector 5, the armature 10 penetrates through the shaft hole of the front magnetic pole 6, an auxiliary spring 13 is sleeved on the small-diameter section of the armature 10, the other end of the auxiliary spring 13 abuts against a spring seat 14 in the middle of a diaphragm 15, the main spring 12 is installed between the large-diameter section of the armature 10 and the rear magnetic pole 9, and the large-diameter section of the armature 10 is provided with an installation hole for accommodating the main spring 12; the armature 10 and the rear magnetic pole 9 are taken as surrounding centers, the beam magnetic tube 11, the electromagnetic coil 8 and the shell 7 are sequentially arranged from inside to outside, when the electromagnetic coil 8 is electrified, the armature 10 and the rear magnetic pole 9 can generate magnetism, and the magnetic field force between the armature 10 and the spring seat 14 is larger than the elastic force of the auxiliary spring 13 between the armature 10 and the spring seat; the on-off of the current and the electrifying frequency of the electromagnetic coil 8 can be adjusted by the controller.
The working principle and the process of the technical scheme are as follows:
1) when the electromagnetic coil 8 is electrified, the rear magnetic pole 9 generates magnetism, meanwhile, the armature 10 also generates magnetism and is adsorbed by the rear magnetic pole 9 to move upwards, the shell 7 and the magnetic confinement tube 11 play a role in restraining a magnetic induction line, because the spring seat 14 is self-magnetized, the magnetic field force between the armature 10 and the spring seat 14 is greater than the elastic force of the auxiliary spring 13, at the moment, the auxiliary spring 13 is compressed, the spring seat 14 drives the diaphragm 15 to move upwards, the air inlet cavity and the air outlet cavity are communicated, the cavity is expanded to generate negative pressure, the air inlet one-way valve 3 is opened, the air outlet one-way valve 17 is closed, and air enters the interior of the pump cavity from the outside;
2) when the electromagnetic coil 8 is de-energized, the rear magnetic pole 9 loses magnetism, the armature 10 also loses magnetism, the main spring 12 pushes the armature 10 to move downwards, the auxiliary spring 13 overcomes the magnetic force of the spring seat 14 to push the spring seat 14 downwards, and then the diaphragm 15 is pushed downwards to close the round pipe body 4b, so that the internal volume of the whole pump cavity is compressed, the air pressure is increased, the air inlet check valve 3 is closed, the air exhaust check valve 17 is opened, and air is exhausted from an exhaust port.
The miniature diaphragm type electronic vacuum pump provided by the embodiment does not need to be provided with a motor, a crank, a connecting rod and other driving mechanisms, so that the volume of a pump body of the traditional electronic diaphragm pump is effectively reduced, and meanwhile, the pumping and exhausting rate can be controlled by controlling the current frequency.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit and scope of the present invention.
Some of the figures and descriptions of the present invention have been simplified to provide a convenient understanding of the modifications of the invention relative to the prior art, and to omit elements for clarity, as those skilled in the art will recognize may also constitute the subject matter of the present invention.
Claims (6)
1. A miniature diaphragm formula electron vacuum pump which characterized in that: the pump comprises a pump body (4), a left pump cover (2), a right pump cover (16), a diaphragm (15), a connecting body (5) and a driving mechanism; the left pump cover (2) and the interior of the pump body (4) form an air inlet cavity, and the right pump cover (16) and the interior of the pump body (4) form an air outlet cavity; a connecting flange (4 a) is arranged in the middle of the pump body (4), the connecting flange (4 a) is annular, a round pipe body (4 b) is arranged in the middle of the connecting flange (4 a), the periphery of the inner side end of the round pipe body (4 b) is connected with the inner side end of the connecting flange (4 a) through a wall plate, and a through hole (4 c) is formed in the wall plate; the diaphragm (15) is arranged between the connecting flange (4 a) and the connecting body (5) and can seal the outer side end of the round pipe body (4 b), and a spring seat (14) with magnetism is arranged in the middle of the diaphragm (15); the driving mechanism comprises a front magnetic pole (6), an electromagnetic coil (8), a rear magnetic pole (9), an armature (10), a beam magnetic pipe (11), a main spring (12) and a shell (7), the front magnetic pole (6) is a disc body with a middle shaft hole, the armature (10) is a stepped shaft and comprises a small-diameter section and a large-diameter section, the front magnetic pole (6) is installed on a connector (5), the armature (10) penetrates through the shaft hole of the front magnetic pole (6), the small-diameter section of the armature (10) is sleeved with an auxiliary spring (13), the other end of the auxiliary spring (13) is abutted against a spring seat (14) in the middle of a diaphragm (15), the main spring (12) is installed between the large-diameter section of the armature (10) and the rear magnetic pole (9), the armature (10) and the rear magnetic pole (9) are used for surrounding centers, and the beam magnetic pipe (11), the electromagnetic coil (8) and the shell (7) are sequentially installed from inside to outside, when the electromagnetic coil (8) is electrified, the armature (10) and the rear magnetic pole (9) can generate magnetism, so that the magnetic field force between the armature (10) and the spring seat (14) is larger than the elastic force of the secondary spring (13) between the armature and the spring seat.
2. The micro-diaphragm type electronic vacuum pump according to claim 1, wherein: the round pipe body (4 b) is communicated with the air inlet cavity, and the through hole (4 c) on the wall plate is communicated with the air exhaust cavity; when the diaphragm (15) is used for sealing the outer side end of the round pipe body (4 b), the air inlet cavity and the air exhaust cavity are not communicated with each other, and when the diaphragm (15) is opened, the air inlet cavity and the air exhaust cavity can be communicated with each other through the round pipe body (4 b) and the through hole (4 c).
3. The micro-diaphragm electronic vacuum pump of claim 2, wherein: an air inlet one-way valve (3) is arranged on the left pump cover (2), and an air outlet one-way valve (17) is arranged on the right pump cover (16).
4. A micro-diaphragm type electronic vacuum pump according to any one of claims 1 to 3, wherein: the large-diameter section of the armature (10) is provided with a mounting hole for accommodating a main spring (12).
5. A micro-diaphragm type electronic vacuum pump according to any one of claims 1 to 3, wherein: the spring seat (14) is formed by injection molding of magnetic powder.
6. A micro-diaphragm type electronic vacuum pump according to any one of claims 1 to 3, wherein: the on-off and the electrifying frequency of the current of the electromagnetic coil (8) can be adjusted by the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210636168.6A CN115030884A (en) | 2022-06-07 | 2022-06-07 | Miniature diaphragm formula electron vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210636168.6A CN115030884A (en) | 2022-06-07 | 2022-06-07 | Miniature diaphragm formula electron vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115030884A true CN115030884A (en) | 2022-09-09 |
Family
ID=83122093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210636168.6A Pending CN115030884A (en) | 2022-06-07 | 2022-06-07 | Miniature diaphragm formula electron vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115030884A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2818842Y (en) * | 2005-09-27 | 2006-09-20 | 罗献尧 | Electromagnetic diaphragm metering pump |
| DE102006044248B3 (en) * | 2006-09-16 | 2008-04-03 | Thomas Magnete Gmbh | Diaphragm pump i.e. hydraulic driven diaphragm pump, for delivering and metering liquid medium, has piston abutting against bottom surface during movement of piston inside compartment so that piston reaches lower dead point |
| CN201254396Y (en) * | 2008-08-18 | 2009-06-10 | 徐茂成 | Pressure self control conducting valve |
| CN101881240A (en) * | 2009-05-08 | 2010-11-10 | 哈尔滨安龙迪环保科技有限公司 | Novel vacuum degree regulator |
| CN103339377A (en) * | 2011-02-01 | 2013-10-02 | 罗伯特·博世有限公司 | Diaphragm pump, and exhaust-gas aftertreatment system having a diaphragm pump |
| CN203362456U (en) * | 2013-07-09 | 2013-12-25 | 上海磊航机械制造有限公司 | Electromagnetic double pilot vacuum differential pressure valve |
| DE102013000765A1 (en) * | 2013-01-18 | 2014-07-24 | Schwarzer Precision GmbH & Co. KG | Diaphragm pump for conveying gaseous or liquid media, has armature with lever-like base body with two lever arm sections extending transverse to rotational axis, where base body is mounted in vibration capable manner about rotational axis |
| CN203856695U (en) * | 2014-06-10 | 2014-10-01 | 北方工具设备（宁波）有限公司 | Electromagnetic diaphragm pump |
| CN206352678U (en) * | 2016-10-11 | 2017-07-25 | 恒丰赛特实业(上海)有限公司 | Cage pressure maintaining valve for stablizing pipeline internal medium pressure |
| CN111255672A (en) * | 2020-03-27 | 2020-06-09 | 湖南腾智机电有限责任公司 | Electromagnetic type miniature variable diaphragm vacuum pump |
| CN215672635U (en) * | 2021-10-09 | 2022-01-28 | 广东顺德安捷伦电器有限公司 | Electromagnetic air pump capable of exhausting and sucking air integrally |
-
2022
- 2022-06-07 CN CN202210636168.6A patent/CN115030884A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2818842Y (en) * | 2005-09-27 | 2006-09-20 | 罗献尧 | Electromagnetic diaphragm metering pump |
| DE102006044248B3 (en) * | 2006-09-16 | 2008-04-03 | Thomas Magnete Gmbh | Diaphragm pump i.e. hydraulic driven diaphragm pump, for delivering and metering liquid medium, has piston abutting against bottom surface during movement of piston inside compartment so that piston reaches lower dead point |
| CN201254396Y (en) * | 2008-08-18 | 2009-06-10 | 徐茂成 | Pressure self control conducting valve |
| CN101881240A (en) * | 2009-05-08 | 2010-11-10 | 哈尔滨安龙迪环保科技有限公司 | Novel vacuum degree regulator |
| CN103339377A (en) * | 2011-02-01 | 2013-10-02 | 罗伯特·博世有限公司 | Diaphragm pump, and exhaust-gas aftertreatment system having a diaphragm pump |
| DE102013000765A1 (en) * | 2013-01-18 | 2014-07-24 | Schwarzer Precision GmbH & Co. KG | Diaphragm pump for conveying gaseous or liquid media, has armature with lever-like base body with two lever arm sections extending transverse to rotational axis, where base body is mounted in vibration capable manner about rotational axis |
| CN203362456U (en) * | 2013-07-09 | 2013-12-25 | 上海磊航机械制造有限公司 | Electromagnetic double pilot vacuum differential pressure valve |
| CN203856695U (en) * | 2014-06-10 | 2014-10-01 | 北方工具设备（宁波）有限公司 | Electromagnetic diaphragm pump |
| CN206352678U (en) * | 2016-10-11 | 2017-07-25 | 恒丰赛特实业(上海)有限公司 | Cage pressure maintaining valve for stablizing pipeline internal medium pressure |
| CN111255672A (en) * | 2020-03-27 | 2020-06-09 | 湖南腾智机电有限责任公司 | Electromagnetic type miniature variable diaphragm vacuum pump |
| CN215672635U (en) * | 2021-10-09 | 2022-01-28 | 广东顺德安捷伦电器有限公司 | Electromagnetic air pump capable of exhausting and sucking air integrally |
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