CN214698533U - Five-way electromagnetic valve guide stacked vacuum generator - Google Patents
Five-way electromagnetic valve guide stacked vacuum generator Download PDFInfo
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- CN214698533U CN214698533U CN202120883412.XU CN202120883412U CN214698533U CN 214698533 U CN214698533 U CN 214698533U CN 202120883412 U CN202120883412 U CN 202120883412U CN 214698533 U CN214698533 U CN 214698533U
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Abstract
The utility model belongs to the technical field of air pressure, concretely relates to vacuum generator. The five-way electromagnetic valve pilot stacked vacuum generator comprises a generator main body and an electromagnetic valve, wherein the generator main body comprises a top block and at least one middle block which are sequentially stacked from top to bottom; the top block is provided with a positive pressure air inlet, a negative pressure suction port and an exhaust port; a nozzle assembly is arranged in the middle block, and three mutually independent cavities, namely a positive pressure cavity, a negative pressure suction cavity and an exhaust cavity, are arranged in the middle block along the air inlet-outlet direction of the nozzle assembly; the solenoid valve includes a main air inlet and at least one main air outlet. The utility model discloses an above-mentioned design back, can containerize a plurality of middle blocks according to vacuum generator's suction demand, only need single solenoid valve guide can realize large-traffic effect for overall structure is simple, has practiced thrift the cost greatly.
Description
Technical Field
The utility model belongs to the technical field of air pressure, concretely relates to vacuum generator.
Background
The vacuum generator is a novel, efficient, clean, economical and small vacuum component which utilizes a positive pressure air source to generate negative pressure, so that the negative pressure can be easily and conveniently obtained in a place with compressed air or a place needing the positive negative pressure in a pneumatic system. Vacuum generators are widely used in industrial automation in the fields of machinery, electronics, packaging, printing, plastics, robots, and the like.
The existing vacuum generator generally adopts a small nozzle structure single piece for use, whether the vacuum is generated or not is controlled through various pilot valves, and when the vacuum generator is used in an integrated manner, each piece adopts an independent electromagnetic valve pilot, so that the following problems can be caused:
1. when the high-flow use is needed, the single chip use cannot meet the flow requirement;
2. when a small-volume vacuum generator is integrated to form a large-flow vacuum generator, a plurality of independent small valve pilots are usually adopted, so that the number of small valves is large, the energy consumption is high, and the outgoing line is large;
3. when a larger flow is needed, the requirement of the flow cannot be met due to the fact that a small-size spray pipe structure is adopted.
SUMMERY OF THE UTILITY MODEL
To the above technical problem, an object of the utility model is to provide a five-way solenoid valve guide stack dress formula vacuum generator.
The five-way electromagnetic valve pilot stacked vacuum generator comprises a generator main body and an electromagnetic valve, wherein the generator main body comprises a top block and at least one middle block which are sequentially stacked from top to bottom;
the top block is provided with a positive pressure air inlet, a negative pressure suction port and an exhaust port;
the nozzle assembly is detachably arranged in the middle block, three mutually independent chambers are arranged in the middle block along the air inlet to air outlet direction of the nozzle assembly and respectively comprise a positive pressure chamber, a negative pressure suction chamber and an air outlet chamber, an air inlet of the nozzle assembly is communicated with the positive pressure chamber, an air outlet of the nozzle assembly is communicated with the air outlet chamber, at least one suction side hole is arranged on the nozzle assembly along the air inlet to air outlet direction, the suction side hole is separated from the negative pressure suction chamber through a valve clack, the positive pressure chamber, the negative pressure suction chamber and the air outlet chamber are all opened up and down, the middle block positioned at the lowest position serves as a bottom block, the bottom surface of the bottom block is a sealing structure, and the bottom surface seals the lower positions of the positive pressure chamber, the negative pressure suction chamber and the air outlet chamber;
the positive pressure cavity of the uppermost intermediate block is communicated with the positive pressure air inlet, the negative pressure suction cavity of the uppermost intermediate block is communicated with the negative pressure suction port, and the exhaust cavity of the uppermost intermediate block is communicated with the exhaust port;
the electromagnetic valve comprises a main air inlet and at least one main air outlet, and one main air outlet is communicated with the positive pressure air inlet through an air passage;
outside air supply passes through the main air inlet admits air, works as the solenoid valve during operation, the main gas outlet is given vent to anger, and gas gets into the positive pressure chamber through the malleation air inlet, and gas gets into from the positive pressure chamber nozzle assembly's air inlet, gaseous flow through during nozzle assembly produce the negative pressure around the nozzle assembly, drive the valve clack is opened, the negative pressure suction chamber produces the negative pressure, right the negative pressure suction mouth sucks, and gas warp nozzle assembly's gas outlet is given vent to anger and is got into the exhaust chamber, final follow the gas vent is carminative.
The utility model discloses an above-mentioned design back, can containerize a plurality of middle blocks according to vacuum generator's suction demand, only need single solenoid valve guide can realize large-traffic effect for overall structure is simple, has practiced thrift the cost greatly.
The top block is provided with a blank air inlet;
the electromagnetic valve is a three-position five-way electromagnetic valve, the electromagnetic valve comprises two independent main air outlets, the other main air outlet is communicated with the air breaking air inlet through an air passage, and the negative pressure suction cavity of the uppermost intermediate block is communicated with the air breaking air inlet;
outside air supply passes through the main air inlet admits air, works as when the solenoid valve is in first operating condition, the gas that the main air inlet got into is through one the main gas outlet gets into the malleation air inlet realizes the suction work, works as when the solenoid valve is in second operating condition, the gas that the main air inlet got into is through another the main gas outlet gets into brokenly empty air inlet, gas warp it gets into negative pressure suction chamber and destroys the vacuum to break empty air inlet, the valve clack is closed, and final gas warp follow behind the exhaust chamber the gas vent is carminative.
The solenoid valve still includes two main gas vents, two the main gas vent is stopped up through the sprue.
And a filtering device is arranged at the negative pressure suction port on the top block, and a silencing device is arranged at the exhaust port.
The pressure switch is connected with the negative pressure suction port through a gas path, and the signal output end of the pressure switch is connected with the control end of the electromagnetic valve;
the pressure switch is used for detecting the pressure value of the negative pressure suction port, and when the pressure value is larger than a preset pressure threshold value, the electromagnetic valve is controlled to break the air and exhaust the air, so that the suction pressure at the negative pressure suction port is in a stable pressure range.
The pressure switch is characterized in that a switch accommodating cavity for accommodating the pressure switch is arranged on the ejector block, a pressure detection port is arranged on the switch accommodating cavity and is communicated with the negative pressure suction port through a gas path, and the pressure switch is detachably arranged on the switch accommodating cavity by adopting a buckle type structure.
The pressure switch preferably adopts a square digital display pressure switch.
Still include a pressure switch sprue, when need not to set up during pressure switch, through the pressure switch sprue blocks up the pressure detection mouth. To avoid gas from exiting the pressure sensing port.
The top block is adjacent to the middle block, the middle block is adjacent to the bottom block, the top block and the bottom block are detachably overlapped together by adopting a bolt structure and are sealed through a sealing gasket.
Mounting grooves are dug upwards on the bottom surfaces of the top block and the middle block, and half bolt holes are formed in the inner walls of the two sides of each mounting groove;
two sides of the top surfaces of the middle block and the bottom block are both provided with side grooves, so that the upper parts of the middle block and the bottom block are both of structures with middle parts protruding upwards, and the side walls of the side grooves are both provided with another half of bolt holes;
the middle block and the bottom block are sequentially embedded into the adjacent mounting grooves through a middle upward protruding structure, and are inserted into the plug pin holes through plug pin structures to be detachably stacked.
And the negative pressure suction cavity and the exhaust cavity of the bottom block are respectively provided with a test port communicated with the bottom. Is convenient for testing and using.
The middle block is internally provided with at least two groups of detachable nozzle assemblies, and the at least two groups of nozzle assemblies are arranged in the middle block side by side.
The nozzle assembly comprises a primary nozzle, a secondary nozzle, a tertiary nozzle and a receiving pipe which are sequentially connected, and at least a Laval nozzle is adopted in the primary nozzle;
the inlet of the primary nozzle is the air inlet of the nozzle assembly, and the outlet of the receiving pipe is the air outlet of the nozzle assembly;
the second grade nozzle with all be equipped with at least one of inside and outside UNICOM on the tertiary nozzle suction side opening, every all be equipped with one on the suction side opening the valve clack, the valve clack is one-way valve clack, one-way valve clack's direction of admitting air is for following the negative pressure suction chamber extremely inside the nozzle unit.
The primary nozzle the secondary nozzle the tertiary nozzle with adopt recess and arch to splice spacing connection between the receiver tube, and the junction all is equipped with sealed the pad and seals. The sealing and positioning between the valve clack and the nozzle assembly are ensured.
Has the advantages that: the utility model has the advantages of as follows:
1. the pilot mode of the single electromagnetic valve is simple and saves cost;
2. the utility model can stack corresponding middle blocks according to the use requirements, increase the corresponding flow and have wide application range;
3. a plurality of large-size nozzle assemblies can be independently arranged in each intermediate block, so that the vacuum generator can achieve the aim of large flow.
Drawings
Fig. 1 is a schematic view of an overall structure of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a side view of FIG. 1;
fig. 4 is a structural perspective view of the top block of the present invention;
FIG. 5 is a perspective view of the middle block of the present invention;
FIG. 6 is a perspective view of the bottom block of the present invention;
FIG. 7 is a schematic view of a nozzle assembly according to the present invention;
FIG. 8 is an internal cross-sectional view of the nozzle assembly of the present invention;
FIG. 9 is another side internal cross-sectional view of FIG. 8;
fig. 10 is a partial perspective view of the nozzle assembly of the present invention;
fig. 11 is a perspective view of the pressure switch block of the present invention.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention will be further explained with reference to the specific drawings.
Referring to fig. 1 to 6, the five-way solenoid pilot stacked vacuum generator comprises a generator main body and a solenoid valve 1, wherein the generator main body comprises a top block 2 and at least one middle block 3 which are sequentially stacked from top to bottom, and the middle block 3 at the lowest part is used as a bottom block 4. When the generator body contains only one intermediate block 3, this intermediate block 3 also acts as a bottom block 4.
Solenoid valve 1 detachable fixes in kicking block 2 top, preferably adopts buckle formula structure detachable to set up in kicking block 2 top one side, as shown in fig. 1, solenoid valve 1 sets up on kicking block top right side. Solenoid valve 1 preferably adopts tribit five-way solenoid valve 1, and solenoid valve 1 includes a main air inlet 11, two independent main gas outlets and two main gas vents 12, the utility model discloses a main gas vent 12 does not have concrete function, plugs up two main gas vents 12 through the sprue during consequently the use. The solenoid valve 1 has three different states, namely a state when the solenoid valve is stopped, and the main air inlet 11 is not communicated with two independent main air outlets. When a coil of the electromagnetic valve 1 is electrified, the electromagnetic valve is in a first working state, the main air inlet 11 is communicated with one main air outlet, when another coil of the electromagnetic valve 1 is electrified, the electromagnetic valve is in a second working state, and the main air inlet 11 is communicated with the other main air outlet.
The top block 2 is provided with a positive pressure air inlet 21, a vacuum inlet 22, a negative pressure suction port 23 and an exhaust port 24. One main air outlet of the electromagnetic valve 1 is communicated with the positive pressure air inlet 21 through an air passage, and the other main air outlet of the electromagnetic valve 1 is communicated with the air breaking inlet 22 through an air passage. A filter device is arranged at the negative pressure suction port 23 on the top block 2 and is used for filtering. A silencing device is arranged at the exhaust port 24 and is used for silencing.
Detachable is provided with nozzle assembly 5 in middle piece 3, the interior chamber that admits air to giving vent to anger along nozzle assembly 5 of middle piece 3 is equipped with three mutually independent cavity, be malleation chamber 31, negative pressure suction chamber 32 and exhaust chamber 33 respectively, malleation chamber 31, negative pressure suction chamber 32 and exhaust chamber 33 are all opened from top to bottom, middle piece 3 that is located the below is as bottom block 4, the bottom surface of bottom block 4 is seal structure, the bottom surface is sealed with malleation chamber 31, the below in negative pressure suction chamber 32 and exhaust chamber 33. The negative pressure suction chamber 32 and the exhaust chamber 33 of the bottom block 4 are respectively provided with a test port 41 communicated with the bottom. Is convenient for testing and using.
The positive pressure chamber 31 of the uppermost intermediate block 3 is communicated with the positive pressure air inlet 21, the negative pressure suction chamber 32 of the uppermost intermediate block 3 is communicated with the vacuum breaking air inlet 22, the negative pressure suction chamber 32 of the uppermost intermediate block 3 is also communicated with the negative pressure suction port 23, and the exhaust chamber 33 of the uppermost intermediate block 3 is communicated with the exhaust port 24. When specifically setting up, malleation air inlet 21, broken empty air inlet 22, negative pressure suction mouth 23 and gas vent 24 on the kicking block 2 are upper and lower UNICOM's setting, and each UNICOM mouth of kicking block 2 directly corresponds the setting directly over each cavity in the middle block 3 of the top, need not to realize the UNICOM through respective gas circuit this moment.
The top block 2, the adjacent middle block 3, the middle block 3 and the bottom block 4 are detachably stacked together by adopting a bolt structure and are sealed by a sealing gasket. Mounting grooves 61 are dug upwards on the bottom surfaces of the top block 2 and the middle block 3, and half bolt holes 62 are formed in the inner walls of the two sides of each mounting groove 61; both sides of the top surfaces of the middle block 3 and the bottom block 4 are provided with side grooves 63, so that the upper parts of the middle block 3 and the bottom block 4 are both of a structure with the middle part protruding upwards, and the side walls of the side grooves 63 are provided with the other half bolt holes 62; the middle block 3 and the bottom block 4 are sequentially embedded into the adjacent mounting grooves 61 through the upward protruding structures in the middle, and are inserted into the plug pin holes 62 through the plug pin structures to be detachably stacked.
Referring to fig. 7 to 10, the air inlet 51 of the nozzle assembly 5 is communicated with the positive pressure chamber 31, the air outlet 52 of the nozzle assembly 5 is communicated with the exhaust chamber 33, at least one suction side hole 53 is formed in the nozzle assembly 5 in the air inlet to outlet direction, and the suction side hole 53 is separated from the negative pressure suction chamber 32 by a valve flap 54. Preferably, at least two sets of nozzle assemblies 5 are detachably arranged in the middle block 3, and the at least two sets of nozzle assemblies 5 are arranged in the middle block 3 side by side.
Each group of nozzle assemblies 5 comprises a primary nozzle 55, a secondary nozzle 56, a tertiary nozzle 57 and a receiving pipe 58 which are connected in sequence, and a Laval nozzle is adopted in at least one primary nozzle 55; the inlet of the primary nozzle 55 is the air inlet 51 of the nozzle assembly 5, and the outlet of the receiving pipe 58 is the air outlet 52 of the nozzle assembly 5; the secondary nozzle 56 and the tertiary nozzle 57 are respectively provided with at least one suction side hole 53 which are communicated with each other, each suction side hole 53 is provided with a valve flap 54, the valve flaps 54 are one-way valve flaps, and the air inlet direction of the one-way valve flaps 54 is from the negative pressure suction chamber 32 to the interior of the nozzle assembly 5. As shown in fig. 7 and 10, the secondary nozzle 56 and the tertiary nozzle 57 are provided with two suction side holes 53, respectively. The primary nozzle 55, the secondary nozzle 56, the tertiary nozzle 57 and the receiving pipe 58 are connected in a splicing and limiting mode through grooves and protrusions, and sealing gaskets are arranged at the joints for sealing. Ensuring a sealed positioning between the flap 54 and the nozzle assembly 5.
Referring to fig. 1, the utility model discloses still include pressure switch 7, pressure switch 7's pressure port passes through gas circuit UNICOM negative pressure suction mouth 23, and pressure switch 7's signal output part connects solenoid valve 1's control end. Be equipped with the switch that holds pressure switch 7 on kicking block 2 and hold chamber 25, the switch holds and is equipped with pressure detection mouth 26 on the chamber 25, and pressure detection mouth 26 passes through gas circuit UNICOM negative pressure suction mouth 23, and pressure switch 7 adopts buckle formula structure detachable to set up on the switch holds chamber 25. The pressure switch 7 is preferably a square digital display pressure switch 7. Referring to fig. 11, a pressure switch block 71 is further included, and when the pressure switch 7 is not required to be provided, the pressure detection port 26 is blocked by the pressure switch block 71. To avoid gas from exiting the pressure sensing port 26.
The utility model discloses during the use, outside air supply admits air through main air inlet 11, when solenoid valve 1 is in first operating condition, main gas outlet is given vent to anger, it is gaseous through malleation air inlet 21 entering malleation chamber 31, gaseous from malleation chamber 31 entering nozzle assembly 5's air inlet, when gaseous flow passes through nozzle assembly 5, produce the negative pressure around nozzle assembly 5, drive valve clack 54 and open, negative pressure suction chamber 32 produces the negative pressure, suction mouth 23 sucks negative pressure, gaseous gas is given vent to anger through nozzle assembly 5's gas outlet and is got into exhaust chamber 33, finally, exhaust from gas vent 24. The pressure switch 7 is used for detecting the pressure value of the negative pressure suction port 23, and when the pressure value is greater than the preset pressure threshold value, the air breaking and exhausting are carried out by controlling the electromagnetic valve 1, so that the suction pressure at the negative pressure suction port 23 is in a stable pressure range. When the electromagnetic valve 1 is controlled to perform air breaking and exhausting, the electromagnetic valve 1 is in the second working state, the air entering from the main air inlet 11 enters the air breaking inlet 22 through the other main air outlet, the air enters the negative pressure suction cavity 32 through the air breaking inlet 22 to break vacuum, the valve clack 54 is closed, and finally the air is exhausted from the exhaust port 24 after passing through the exhaust cavity 33.
The utility model discloses an above-mentioned design back, can be according to vacuum generator's suction demand, a plurality of middle blocks of collection dress 3 only need 1 guide's of an independent solenoid valve can realize large-traffic effect for overall structure is simple, has practiced thrift the cost greatly.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A five-way electromagnetic valve pilot stacked vacuum generator comprises a generator main body and an electromagnetic valve, and is characterized in that the generator main body comprises a top block and at least one middle block which are sequentially stacked from top to bottom;
the top block is provided with a positive pressure air inlet, a negative pressure suction port and an exhaust port;
the nozzle assembly is detachably arranged in the middle block, three mutually independent chambers are arranged in the middle block along the air inlet to air outlet direction of the nozzle assembly and respectively comprise a positive pressure chamber, a negative pressure suction chamber and an air outlet chamber, an air inlet of the nozzle assembly is communicated with the positive pressure chamber, an air outlet of the nozzle assembly is communicated with the air outlet chamber, at least one suction side hole is arranged on the nozzle assembly along the air inlet to air outlet direction, the suction side hole is separated from the negative pressure suction chamber through a valve clack, the positive pressure chamber, the negative pressure suction chamber and the air outlet chamber are all opened up and down, the middle block positioned at the lowest position serves as a bottom block, the bottom surface of the bottom block is a sealing structure, and the bottom surface seals the lower positions of the positive pressure chamber, the negative pressure suction chamber and the air outlet chamber;
the positive pressure cavity of the uppermost intermediate block is communicated with the positive pressure air inlet, the negative pressure suction cavity of the uppermost intermediate block is communicated with the negative pressure suction port, and the exhaust cavity of the uppermost intermediate block is communicated with the exhaust port;
the solenoid valve includes main air inlet and at least one main gas outlet, one main gas outlet passes through gas circuit UNICOM the malleation air inlet.
2. The five-way solenoid pilot stack vacuum generator according to claim 1, wherein a blank air inlet is provided on the top block;
the electromagnetic valve adopts three-position five-way electromagnetic valve, the electromagnetic valve includes two independence main gas outlet, another main gas outlet passes through the gas circuit UNICOM broken empty air inlet, be located the top the middle piece the negative pressure suction chamber with broken empty air inlet UNICOM.
3. The five-way solenoid pilot stack vacuum generator of claim 1, wherein the solenoid further comprises two main exhaust ports, both of which are blocked by a block;
and a filtering device is arranged at the negative pressure suction port on the top block, and a silencing device is arranged at the exhaust port.
4. The pilot stack vacuum generator of claim 2, further comprising a pressure switch, wherein a pressure port of the pressure switch is connected to the negative pressure suction port through a gas path, and a signal output terminal of the pressure switch is connected to a control terminal of the solenoid valve.
5. The five-way solenoid valve pilot stack vacuum generator according to claim 4, wherein a switch accommodating cavity for accommodating the pressure switch is arranged on the top block, a pressure detection port is arranged on the switch accommodating cavity, the pressure detection port is communicated with the negative pressure suction port through a gas path, and the pressure switch is detachably arranged on the switch accommodating cavity by adopting a buckle type structure;
still include a pressure switch sprue, when need not to set up during pressure switch, through the pressure switch sprue blocks up the pressure detection mouth.
6. The five-way solenoid pilot stack vacuum generator according to claim 1, wherein the top block and the adjacent middle block, the middle block and the middle block, and the middle block and the bottom block are detachably stacked together by using a plug pin structure and sealed by using a sealing gasket;
mounting grooves are dug upwards on the bottom surfaces of the top block and the middle block, and half bolt holes are formed in the inner walls of the two sides of each mounting groove;
two sides of the top surfaces of the middle block and the bottom block are both provided with side grooves, so that the upper parts of the middle block and the bottom block are both of structures with middle parts protruding upwards, and the side walls of the side grooves are both provided with another half of bolt holes;
the middle block and the bottom block are sequentially embedded into the adjacent mounting grooves through a middle upward protruding structure, and are inserted into the plug pin holes through plug pin structures to be detachably stacked.
7. The five-way solenoid pilot stack vacuum generator according to claim 1, wherein the negative pressure suction chamber and the exhaust chamber of the bottom block are respectively provided with a test port communicating with the bottom.
8. The pilot stack vacuum generator of claim 1, wherein at least two sets of said nozzle assemblies are removably disposed in said middle block, said at least two sets of said nozzle assemblies being disposed side-by-side in said middle block.
9. The five-way solenoid pilot stack vacuum generator according to claim 1 or 8, wherein the nozzle assembly comprises a primary nozzle, a secondary nozzle, a tertiary nozzle and a receiving pipe which are connected in sequence, and at least a Laval nozzle is adopted inside the primary nozzle;
the inlet of the primary nozzle is the air inlet of the nozzle assembly, and the outlet of the receiving pipe is the air outlet of the nozzle assembly;
the second grade nozzle with all be equipped with at least one of inside and outside UNICOM on the tertiary nozzle suction side opening, every all be equipped with one on the suction side opening the valve clack, the valve clack is one-way valve clack, one-way valve clack's direction of admitting air is for following the negative pressure suction chamber extremely inside the nozzle unit.
10. The five-way solenoid pilot stack vacuum generator according to claim 9, wherein the primary nozzle, the secondary nozzle, the tertiary nozzle and the receiving pipe are connected in a splicing and limiting manner by grooves and protrusions, and sealing gaskets are arranged at the joints for sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120883412.XU CN214698533U (en) | 2021-04-27 | 2021-04-27 | Five-way electromagnetic valve guide stacked vacuum generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120883412.XU CN214698533U (en) | 2021-04-27 | 2021-04-27 | Five-way electromagnetic valve guide stacked vacuum generator |
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| CN214698533U true CN214698533U (en) | 2021-11-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153834A (en) * | 2021-04-27 | 2021-07-23 | 行益科技(宁波)有限公司 | Five-way electromagnetic valve guide stacked vacuum generator |
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2021
- 2021-04-27 CN CN202120883412.XU patent/CN214698533U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153834A (en) * | 2021-04-27 | 2021-07-23 | 行益科技(宁波)有限公司 | Five-way electromagnetic valve guide stacked vacuum generator |
| CN113153834B (en) * | 2021-04-27 | 2024-05-10 | 行益科技(宁波)有限公司 | Five-way electromagnetic valve pilot stacked vacuum generator |
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