CN108962672B - Explosion-proof compact pressure switch and use method thereof - Google Patents
Explosion-proof compact pressure switch and use method thereof Download PDFInfo
- Publication number
- CN108962672B CN108962672B CN201811208087.6A CN201811208087A CN108962672B CN 108962672 B CN108962672 B CN 108962672B CN 201811208087 A CN201811208087 A CN 201811208087A CN 108962672 B CN108962672 B CN 108962672B
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- explosion
- spring
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 26
- 230000001105 regulatory effect Effects 0.000 claims description 47
- 239000012528 membrane Substances 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 13
- 230000001960 triggered effect Effects 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 abstract description 10
- 238000007906 compression Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 8
- 239000002360 explosive Substances 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 6
- 238000010892 electric spark Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
- H01H9/042—Explosion-proof cases
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Fluid Pressure (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
Abstract
The invention discloses an explosion-proof compact pressure switch and a use method thereof, which are characterized in that: including casing, electrical apparatus joint and process joint, the casing is the cuboid that inside is equipped with cylindrical cavity, and the casing left end is connected with the process joint, and process joint right side, casing inside are equipped with the piston post, and the piston post outside cover has the axle sleeve, and piston post right side is equipped with the ejector pin, and the ejector pin outside cover has gasket and spring, and the casing right-hand member is pegged graft electrical apparatus joint and is located the spring right side, and electrical apparatus joint right side is equipped with rivet lid, through rivet and casing fixed connection, is equipped with switch element in the electrical apparatus joint, switch element connecting wire and leading out from electrical apparatus joint right-hand member, and the piston post promotes the ejector pin horizontal translation and compresses and release the spring in the casing under the pressure effect, promotes the ejector pin right compression spring and closed switch element when the pressure that the piston post received reaches the switch threshold value. The invention is suitable for hydraulic or pneumatic systems with explosion-proof requirements, and has the advantages of compact and reasonable structure and safe and reliable use.
Description
Technical Field
The invention relates to the field of industrial switches, in particular to an explosion-proof compact pressure switch and a use method thereof.
Background
The pressure switch is widely used in the fields of petroleum, chemical industry, metallurgy, electric power, water supply and the like, can output alarm or control signals according to pressure parameter changes of gas or liquid, and has important application in the industrial field. For electrical equipment used in an explosive gas environment, a hydraulic system and a pneumatic system are usually arranged, because a common pressure switch is not provided with an explosion-proof shell, explosion can be generated when explosive gas encounters electric spark, and if the explosion is transmitted to the whole explosive gas environment, serious safety accidents can be caused, so that the pressure switch with the explosion-proof function and the pressure monitoring function in the system is required to be designed. The pressure switch has wide application range and large daily maintenance workload, and needs to be capable of clearly indicating the switch state locally and automatically reporting the switch position and state information so as to simplify maintenance work and improve efficiency and safety.
Disclosure of Invention
The invention aims at: the pressure switch with the explosion-proof function and the compact structure and the use method thereof are provided, the explosion-proof design is adopted, when explosive gas explodes when electric sparks are generated in the electric equipment, the explosive gas can be prevented from being transmitted to the outside, serious safety accidents are effectively avoided, and meanwhile, the pressure switch has the characteristics of adjusting a pressure threshold value and displaying a report switch state.
The invention aims at realizing the following technical scheme:
an explosion-proof compact pressure switch, includes casing, electrical apparatus joint and process joint, its characterized in that: the casing is the cuboid, inside is equipped with cylindrical cavity, the casing left end with be used for connecting the pressure source process joint threaded connection and sealed through the second sealing washer, process joint right side the inside cylindrical piston post that is equipped with of casing, the piston post outside is equipped with the axle sleeve, the axle sleeve with be equipped with the third sealing washer between the process joint, the axle sleeve with be equipped with the ste between the piston post, the piston post right side is equipped with cylindrical ejector pin, ejector pin outside cover has gasket and spring, the casing right-hand member is pegged graft the electrical apparatus connects and is located the spring right side, the electrical apparatus connects the right side be equipped with annular rivet lid, through rivet with casing fixed connection, electrical apparatus connect with be equipped with first sealing washer between the casing, be equipped with switching element in the electrical apparatus connects, the switching element outside be equipped with the fixed sleeve and through the location bayonet lock with electrical apparatus connects fixed connection, switching element connecting wire and follow electrical apparatus connects the right-hand member and draw forth, the piston post can promote under the pressure the ejector pin is in the horizontal movement of casing and to compress the spring when the ejector pin receives the compression threshold can be reached to the compression threshold.
The invention is further perfected and implemented by the following supplementary scheme:
the pressure regulating nut and the pressure regulating element are sleeved on the outer side of the ejector rod and positioned on the right side of the spring, the position of the spring can be limited by rotating the pressure regulating nut so as to regulate the pressure threshold value of the trigger pressure switch, a plurality of holes are formed in the outer wall of the pressure regulating nut, jackscrews are arranged in the holes and used for fixing the position of the pressure regulating nut, a cover plate fixed by a cover plate screw is arranged on the rear side of the shell, the cover plate is opened to adjust the pressure regulating element and the pressure regulating nut, and a ground wire screw and an explosion-proof plug are arranged at the bottom of the shell.
Still be equipped with the elastic membrane in the process joint, elastic membrane one side with pressure source medium contacts, the opposite side with the piston post contacts, the elastic membrane can produce deformation and promote under the pressure effect the piston post is in horizontal movement in the casing, the piston post can promote the ejector pin horizontal migration in the casing and to the spring compresses and releases, when the pressure that receives reaches the switch threshold value, the piston post can promote the ejector pin compresses rightwards the spring and closes switching element.
The rivet cover is also provided with a switch state indicator lamp, the switch state indicator lamp is electrically connected with the switch element, and when the switch element is closed, the switch state indicator lamp is on.
The remote alarm is provided with a Beidou satellite short message communication module, and is preset to contain alarm short messages of position information and switch states, and is triggered by the switch element.
The application method of the explosion-proof compact pressure switch comprises the following steps:
1) Debugging and setting a switching threshold value of an explosion-proof compact pressure switch, connecting the explosion-proof compact pressure switch with a pressure calibrator, opening the cover plate, adjusting the pressure regulating element and the pressure regulating nut, screwing a jackscrew to fix the position of the pressure regulating nut after the pressure regulating element and the pressure regulating nut are adjusted to the required switching threshold value, closing the cover plate, and screwing a cover plate screw;
2) Connecting a process connector of the explosion-proof compact pressure switch with a pressure source;
3) Electrically connecting a lead led out from an electrical connector of the explosion-proof compact pressure switch with controlled equipment;
4) After the step 3) is completed, the explosion-proof compact pressure switch enters a normal working state, and when the medium pressure in the pressure source reaches a set switch threshold value, the piston column pushes the ejector rod to move rightwards to compress the spring (12) and close the switch element, and meanwhile, the controlled equipment is triggered.
The invention has the beneficial effects that: the explosion-proof compact pressure switch and the use method thereof provided by the invention are suitable for hydraulic or pneumatic systems with explosion-proof requirements, and when explosive gas explodes when electric sparks are generated in electrical equipment, the explosive gas can be prevented from being transmitted to the outside, serious safety accidents are effectively avoided, and the explosion-proof compact pressure switch has the advantages of compact and reasonable structure and safe and reliable use; and the threshold value of the pressure switch can be regulated according to the need, when the pressure value reaches the set threshold value, the state indication can be given locally and an alarm message with position information can be sent to a remote management end when the pressure value is in switch action, so that maintenance personnel can find abnormal conditions in time, and the maintenance work of the system is simplified. Meanwhile, the process joint can be provided with the elastic membrane, so that the process joint can be suitable for occasions with corrosiveness and viscosity of pressure source media, and has a wider application range.
Drawings
Fig. 1 is a front view of the structure of the present invention.
Fig. 2 is a left side view of the structure of the present invention.
FIG. 3 is a cross-sectional view of the structure A-A of the present invention.
In the figure, 1-a housing; 2-an electrical connector; 3-rivet covers; 4-rivet; 5-positioning bayonet locks; a 6-switching element; 7-fixing the sleeve; 8-a first sealing ring; 9-a voltage regulating element; 10-jackscrews; 11-a pressure regulating nut; 12-a spring; 13-ejector rods; 14-a gasket; 15-shaft sleeve; 16-a second sealing ring; 17-a third sealing ring; 18-stoneley sealing; 19-piston column; 20-process connection; 21-ground wire screws; 22-cover plate screw; 23-cover plate; 25-wires.
Detailed Description
The magnetic differential pressure gauge and the method of use of the invention are further described below with reference to the drawings and examples:
the utility model provides an explosion-proof compact pressure switch, includes casing 1, electrical apparatus connects 2 and process joint 20, casing 1 is the cuboid, and inside is equipped with cylindrical cavity, casing 1 left end with be used for connecting the pressure source process joint 20 threaded connection and sealed through second sealing washer 16, process joint 20 right side the inside cylindrical piston post 19 that is equipped with of casing 1, the piston post 19 outside is equipped with axle sleeve 15, axle sleeve 15 with be equipped with third sealing washer 17 between the process joint, axle sleeve 15 with be equipped with between the piston post 19 and seal 18, piston post 19 right side is equipped with cylindrical ejector pin 13, ejector pin 13 outside cover has gasket 14 and spring 12, casing 1 right-hand member grafting electrical apparatus connects 2 and is located spring 12 right side, electrical apparatus connects 2 right side is equipped with annular rivet lid 3, through rivet 4 with casing 1 fixed connection, be equipped with first sealing washer 8 between electrical apparatus connects 2, be equipped with switch element 6 in the interior, switch element 6 outside is equipped with and clamp pin 7 and be equipped with and receive the compression pin 5 can be carried out to the compression pin 13 and compression pin 13 is connected to the electrical apparatus is followed to the side of being connected to the electrical apparatus is equipped with in the piston post 2 and is equipped with the compression pin 6 when compression pin 13 is pressed down to the compression pin 13 and is pressed to the compression pin 13.
The pressure regulating nut 11 and the pressure regulating element 9 are further arranged in the shell 1, so that the switching threshold value of the explosion-proof compact pressure switch can be conveniently adjusted and set according to specific requirements, the explosion-proof compact pressure switch is more flexible to use, and the application range is wider; the pressure regulating nut 11 and the pressure regulating element 9 are sleeved on the outer side of the ejector rod 13 and are positioned on the right side of the spring 12, the position of the spring 12 can be limited by rotating the pressure regulating nut 11 so as to regulate the pressure threshold value of the trigger pressure switch, a plurality of holes are formed in the outer wall of the pressure regulating nut 11, jackscrews 10 are arranged in the holes and used for fixing the position of the pressure regulating nut 11, and the change of the switch threshold value in use after the switch threshold value is regulated in place is prevented from influencing the accuracy of setting the threshold value; the rear side of the shell 1 is provided with a rectangular cover plate 23, the cover plate 23 is fixedly connected with the shell 1 through a cover plate screw 22, the pressure regulating element 9 and the pressure regulating nut 11 in the shell 1 can be regulated by opening the cover plate 23, and the cover plate 23 can be conveniently opened and regulated by a user, so that the explosion-proof compact pressure switch is more convenient to use; the bottom of the shell 1 is provided with a ground wire screw 21 and an explosion-proof plug.
The process joint 20 is also internally provided with an elastic membrane, one side of the elastic membrane is contacted with a pressure source medium, the other side of the elastic membrane is contacted with the piston column 19, the elastic membrane can deform and push the piston column 19 to horizontally move in the shell 1 under the action of pressure, the piston column 19 can push the ejector rod 13 to horizontally move in the shell 1 and compress and release the spring 12, and when the received pressure reaches a switch threshold value, the piston column 19 can push the ejector rod 13 to rightward compress the spring 12 and close the switch element 6. The elastic membrane is arranged in the process joint, so that the invention can be suitable for occasions with corrosiveness and viscosity of pressure source media, and has wider application range.
The rivet cover 3 is also provided with a switch state indicator lamp, the switch state indicator lamp is electrically connected with the switch element 6, and when the switch element 6 is closed, the switch state indicator lamp is on, so that a user can clearly determine the state of the explosion-proof compact pressure switch in the use process.
The remote alarm is further arranged above the shell 1, is provided with a Beidou satellite short message communication module, presets alarm short messages containing position information and switch states, is triggered by the switch element 6, and is triggered and sends the alarm short messages to a preset alarm receiving end when the switch element 6 is closed. The remote alarm can send an alarm message with position and state information to a preset remote management end, so that maintenance personnel can find abnormal conditions in time, and maintenance work of the system is simplified.
The application method of the explosion-proof compact pressure switch comprises the following steps:
1) Debugging and setting a switching threshold value of an explosion-proof compact pressure switch, connecting the explosion-proof compact pressure switch with a pressure calibrator, opening the cover plate, adjusting the pressure regulating element and the pressure regulating nut, screwing a jackscrew to fix the position of the pressure regulating nut after the pressure regulating element and the pressure regulating nut are adjusted to the required switching threshold value, closing the cover plate, and screwing a cover plate screw;
2) Connecting a process connector of the explosion-proof compact pressure switch with a pressure source;
3) Electrically connecting a lead led out from an electrical connector of the explosion-proof compact pressure switch with controlled equipment;
4) After the step 3) is completed, the explosion-proof compact pressure switch enters a normal working state, and when the medium pressure in the pressure source reaches a set switch threshold value, the piston column 19 pushes the ejector rod 13 to move rightwards to compress the spring 12 and close the switch element 6, and meanwhile, the controlled equipment is triggered.
In the specific embodiment of the invention, the shell, the process connector and the piston column are made of 316SS stainless steel, the sealing ring is made of fluororubber, the types of the switch elements comprise single-pole double throw and double-pole double arrangement, the explosion-proof grade is Exd IICT6, and the switch elements have been applied to petrochemical industry and natural gas industry, so that good application effects are obtained.
It should be noted that several improvements and modifications can be made without departing from the basic structure of the present invention, and the technical solutions of these various improvements and modifications should also be considered as the protection scope of the present patent.
Claims (2)
1. An explosion-proof compact pressure switch, includes casing (1), electrical apparatus joint (2) and process joint (20), its characterized in that: the utility model discloses a high-voltage power supply, including casing (1), shell (1), piston, electric appliance joint (1) and spring (1), casing (1) is the cuboid, inside is equipped with cylindrical cavity, casing (1) left end with be used for connecting the pressure source process joint (20) threaded connection and seal through second sealing washer (16), process joint (20) right side the inside cylindrical piston post (19) that is equipped with of casing (1), piston post (19) outside cover has axle sleeve (15), axle sleeve (15) with be equipped with third sealing washer (17) between process joint (20), be equipped with between axle sleeve (15) with between piston post (19) stoneley seal (18), piston post (19) right side is equipped with cylindrical ejector pin (13), ejector pin (13) outside cover has gasket (14) and spring (12), casing (1) right-hand member grafting electric appliance joint (2) and be located spring (12) right side, electric appliance joint (2) right side is equipped with circular ring rivet lid (3) through rivet (4) with casing (1) fixed connection, electric appliance joint (2) are equipped with between casing (1) and the first switch (6), the switch element (6) is sleeved with a fixed sleeve (7) and is fixedly connected with the electrical connector (2) through a positioning bayonet lock (5), the switch element (6) is connected with a lead (25) and is led out from the right end of the electrical connector (2), the piston column (19) can push the ejector rod (13) to horizontally move in the shell (1) under the action of pressure and compress and release the spring (12), and when the received pressure reaches a switch threshold value, the piston column (19) can push the ejector rod (13) to rightward compress the spring (12) and close the switch element (6);
the pressure regulating device is characterized in that a pressure regulating nut (11) and a pressure regulating element (9) are further arranged inside the shell (1), the pressure regulating nut (11) and the pressure regulating element (9) are sleeved on the outer side of the ejector rod (13) and are positioned on the right side of the spring (12), the position of the spring (12) can be limited by rotating the pressure regulating nut (11) so as to regulate the pressure threshold value of the triggering pressure switch, a plurality of holes are formed in the outer wall of the pressure regulating nut (11), jackscrews (10) are arranged in the holes and used for fixing the position of the pressure regulating nut (11), a cover plate (23) fixed through a cover plate screw (22) is arranged on the rear side of the shell (1), the cover plate (23) is opened, the pressure regulating element (9) and the pressure regulating nut (11) can be regulated, and a ground wire screw (21) and an explosion-proof plug are arranged at the bottom of the shell (1).
An elastic membrane is further arranged in the process connector (20), one side of the elastic membrane is in contact with a pressure source medium, the other side of the elastic membrane is in contact with the piston column (19), the elastic membrane can deform under the action of pressure and push the piston column (19) to horizontally move in the shell (1), the piston column (19) can push the ejector rod (13) to horizontally move in the shell (1) and compress and release the spring (12), and when the pressure reaches a switching threshold value, the piston column (19) can push the ejector rod (13) to rightward compress the spring (12) and close the switching element (6);
a switch state indicator lamp is further arranged on the rivet cover (3), the switch state indicator lamp is electrically connected with the switch element (6), and when the switch element (6) is closed, the switch state indicator lamp is on;
the remote alarm is provided with a Beidou satellite short message communication module, presets alarm short messages containing position information and a switch state, and is triggered by the switch element (6), and when the switch element (6) is closed, the remote alarm is triggered and sends the alarm short messages to a preset alarm receiving end.
2. A method of using an explosion-proof compact pressure switch according to claim 1, comprising:
1) The method comprises the steps of debugging and setting a switching threshold value of an explosion-proof compact pressure switch, connecting the explosion-proof compact pressure switch with a pressure calibrator, opening a cover plate (23), adjusting a pressure regulating element (9) and a pressure regulating nut (11), screwing a jackscrew (10) to fix the position of the pressure regulating nut (11) after the pressure regulating element is adjusted to a required switching threshold value, and closing the cover plate (23) and screwing a cover plate screw (22);
2) Connecting a process connection (20) of an explosion-proof compact pressure switch to a pressure source;
3) A lead (25) led out from an electric appliance connector (2) of the explosion-proof compact pressure switch is electrically connected with controlled equipment;
4) After the step 3) is completed, the explosion-proof compact pressure switch enters a normal working state, and when the medium pressure in the pressure source reaches a set switch threshold value, the piston column (19) pushes the ejector rod (13) to move rightwards to compress the spring (12) and close the switch element (6), and meanwhile, the controlled equipment is triggered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811208087.6A CN108962672B (en) | 2018-10-17 | 2018-10-17 | Explosion-proof compact pressure switch and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811208087.6A CN108962672B (en) | 2018-10-17 | 2018-10-17 | Explosion-proof compact pressure switch and use method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108962672A CN108962672A (en) | 2018-12-07 |
| CN108962672B true CN108962672B (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811208087.6A Active CN108962672B (en) | 2018-10-17 | 2018-10-17 | Explosion-proof compact pressure switch and use method thereof |
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| Country | Link |
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| CN (1) | CN108962672B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044536A (en) * | 2019-05-17 | 2019-07-23 | 大唐半导体科技有限公司 | A kind of gas-detecting device |
| CN110534364B (en) * | 2019-08-13 | 2024-08-23 | 六安一六八航空航天精密器件有限公司 | Flexible diaphragm switch sensing device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2919505Y (en) * | 2006-02-23 | 2007-07-04 | 侯耀淞 | Pressure switch |
| CN201315289Y (en) * | 2008-10-27 | 2009-09-23 | 常州澳丰机电制造有限公司 | Intrinsic safety pressure switch for mine |
| CN202084473U (en) * | 2011-06-09 | 2011-12-21 | 刘晓红 | Anti-explosion pressure switch |
| CN202855633U (en) * | 2012-10-23 | 2013-04-03 | 常州市天利控制器制造有限公司 | Pressure controller |
| CN208848824U (en) * | 2018-10-17 | 2019-05-10 | 河北领冠仪器仪表有限公司 | A kind of compact pressure switch of explosion-proof type |
-
2018
- 2018-10-17 CN CN201811208087.6A patent/CN108962672B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2919505Y (en) * | 2006-02-23 | 2007-07-04 | 侯耀淞 | Pressure switch |
| CN201315289Y (en) * | 2008-10-27 | 2009-09-23 | 常州澳丰机电制造有限公司 | Intrinsic safety pressure switch for mine |
| CN202084473U (en) * | 2011-06-09 | 2011-12-21 | 刘晓红 | Anti-explosion pressure switch |
| CN202855633U (en) * | 2012-10-23 | 2013-04-03 | 常州市天利控制器制造有限公司 | Pressure controller |
| CN208848824U (en) * | 2018-10-17 | 2019-05-10 | 河北领冠仪器仪表有限公司 | A kind of compact pressure switch of explosion-proof type |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108962672A (en) | 2018-12-07 |
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