CN110285915B - Vacuum pump detects with good negative pressure sensor of stability - Google Patents
Vacuum pump detects with good negative pressure sensor of stability Download PDFInfo
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- CN110285915B CN110285915B CN201910624395.5A CN201910624395A CN110285915B CN 110285915 B CN110285915 B CN 110285915B CN 201910624395 A CN201910624395 A CN 201910624395A CN 110285915 B CN110285915 B CN 110285915B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
- G01L19/147—Details about the mounting of the sensor to support or covering means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/04—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges
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- Analytical Chemistry (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a negative pressure sensor with good stability for vacuum pump detection, which comprises a shell, a strain gauge and a circuit assembly, wherein the strain gauge is electrically connected with the circuit assembly through a lead-out wire inside the strain gauge, the top end inside the shell is fixedly connected with a negative pressure bin, a sealing pipe is arranged on the lower side, close to the negative pressure bin, inside the shell, a sealing ring is fixedly connected between the sealing pipe and the inner wall of the shell, and a piston rod is connected inside the sealing pipe in a sliding manner. This vacuum pump detects with good negative pressure sensor of stability, simple structure, low in production cost, under the condition of negative pressure, the piston rod can slide along the negative pressure storehouse to drive the pole of meeting an emergency and exert the effort to the rubber pad, thereby let the foil gage take place deformation, through rotating the adjustment carousel, can adjust the position of pole of meeting an emergency, can adjust it before using negative pressure sensor, thereby can improve the degree of accuracy that detects.
Description
Technical Field
The invention relates to the technical field of vacuum pump detection, in particular to a negative pressure sensor with good stability for vacuum pump detection.
Background
The vacuum pump refers to a device or equipment for obtaining vacuum by pumping a pumped container by using a mechanical, physical, chemical or physicochemical method. In general, a vacuum pump is a device for improving, generating and maintaining a vacuum in a certain closed space by various methods. When the vacuum pump is used, the vacuum pump needs to be periodically detected, and when the vacuum pump is detected, a negative pressure sensor needs to be used for detecting the performance and accuracy of the vacuum pump.
The Chinese patent discloses a mining negative pressure sensor (publication number: CN202471333U), which comprises a negative pressure sensing element, a digital zero setting and signal amplifying circuit, a PLC controller, an output control circuit and a display, wherein the negative pressure sensing element is connected with the digital zero setting and signal amplifying circuit, and the PLC controller is respectively connected with the digital zero setting and signal amplifying circuit, the output control circuit and the display.
Chinese patent discloses a pressure sensor (publication No. CN100417928C) including a metal stem having a diaphragm deformed according to an applied pressure; and a semiconductor substrate, wherein an insulating layer is interposed between the first and second semiconductor layers. A plurality of strain gauges are formed at predetermined regions of the first semiconductor layer of the semiconductor substrate for converting the bending of the diaphragm into an electrical signal. In the pressure sensor, the strain gauge has pattern shapes insulated and spaced apart from each other by trenches, wherein each trench extends from a surface of the first semiconductor layer to the insulating layer.
The existing negative pressure sensor is complex in structure and high in production cost, and needs to be calibrated before the negative pressure sensor is used, so that the accuracy in detecting the vacuum pump is improved, the vacuum pump can suck air away in the process of inspection, the pressure inside the inspection device can be changed, the negative pressure sensor needs to be well fixed, and the negative pressure sensor is prevented from falling off in the process of inspection, so that inspection data are influenced.
Disclosure of Invention
Technical problem to be solved
The invention provides a negative pressure sensor with good stability for vacuum pump detection, which solves the problems that the existing negative pressure sensor has a complex structure and high production cost, the negative pressure sensor needs to be calibrated before being used to improve the accuracy in vacuum pump detection, and the vacuum pump can suck air away during detection, so that the pressure inside a detection device can be changed, the negative pressure sensor needs to be well fixed, and the negative pressure sensor is prevented from falling during detection to influence detection data.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a negative pressure sensor with good stability for vacuum pump detection comprises a shell, a strain gauge and a circuit assembly, the strain gauge is electrically connected with the circuit assembly through a lead-out wire in the strain gauge, the top end in the shell is fixedly connected with a negative pressure bin, and a sealing tube is arranged at the lower side of the inner part of the shell close to the negative pressure bin, a sealing ring is fixedly connected between the sealing tube and the inner wall of the shell, and the inside of the sealing tube is connected with a piston rod in a sliding way, the top end of the piston rod is positioned inside the negative pressure bin, the piston rod is tightly attached to the negative pressure bin, a clapboard is fixedly connected between the edge of the upper surface of the sealing tube and the top of the shell, the side walls of the clapboard and the shell are both fixedly connected with an inner ring, the upper side of the inner ring is fixedly connected with a rubber pad, the strain gauge is adhered to the upper surface of the rubber pad, and the circuit assembly is fixedly connected to the top of the shell on the upper side of the strain gauge;
the outside fixedly connected with connecting rod of piston rod bottom, fixed surface is connected with the pole of meeting an emergency on the connecting rod, the pole of meeting an emergency runs through the sealing ring, and the top of the pole of meeting an emergency hugs closely the downside at the rubber pad, the equal fixedly connected with slide bar of lower surface of piston rod and connecting rod, the inside sliding connection of slide bar has the dead lever, the bottom and the shell fixed connection of dead lever, and the outside of slide bar and dead lever all overlaps and is equipped with coupling spring, coupling spring's both ends respectively with piston rod, connecting rod and shell fixed connection.
Preferably, one side embedding of shell bottom is connected with the adjustment carousel, and the inside equal fixedly connected with chute pole in both sides that is close to the adjustment carousel of shell, the inside rotation of adjustment carousel is connected with the slide bar, the both ends of slide bar slide in the inside of chute pole, the total effort of slide bar and chute pole is greater than the sliding friction between slide bar and the chute pole.
Preferably, the middle part fixedly connected with fixed hob of piston rod and connecting rod lower surface total length, the outside cover of fixed hob is equipped with outer hob, and the surface of fixed hob and the internal surface of outer hob all are provided with the screw thread, the interlock is connected between fixed hob and the outer hob, the surface of outer hob is provided with the ring gear, the one end and the outer hob interlock of adjustment carousel are connected.
Preferably, the outer side of the outer wall of the shell, which is close to the adjusting turntable, is hinged with an outer cover through a hinge, the outer cover is an arched component, one end, far away from the hinge, of the outer cover is embedded into the side wall of the shell, and a sealing ring is arranged at the position, connected with the shell, of the outer cover.
Preferably, the outside cover of shell is equipped with solid fixed ring, gu fixed ring's side fixedly connected with fixed plate, the both ends of fixed plate all through connection have fixed subsides.
Preferably, the clamping groove is evenly formed in the position, connected with the fixing ring, of the shell, the clamping block is evenly and fixedly connected with the inner ring of the fixing ring, and the interval and the size of the clamping block are the same as those of the clamping groove.
Preferably, the fixing ring comprises a first connecting ring and a second connecting ring, the first connecting ring and the second connecting ring are rotatably connected, and one ends of the first connecting ring and the second connecting ring, which are far away from the rotating portion, are fixed through bolts.
Preferably, fixed subsides include knob and threaded rod, the bottom fixedly connected with connecting plate of threaded rod, disposable rubberizing has been pasted to the lower surface of connecting plate, the inside of knob is provided with the internal thread, the top in the threaded rod outside is provided with the external screw thread, and the threaded rod passes through the external screw thread and is connected with the knob with the internal thread interlock, and the threaded rod is for the length that is provided with the external screw thread position and the highly equal of fixed plate.
(III) advantageous effects
The invention provides a negative pressure sensor with good stability for vacuum pump detection. The method has the following beneficial effects:
(1) the negative pressure sensor with good stability for vacuum pump detection is characterized in that a negative pressure bin is fixedly connected to the top end inside a shell, a sealing pipe is arranged on the lower side, close to the negative pressure bin, inside the shell, a sealing ring is fixedly connected between the sealing pipe and the inner wall of the shell, a piston rod is slidably connected inside the sealing pipe, the top end of the piston rod is located inside the negative pressure bin, the piston rod and the negative pressure bin are tightly attached, a partition plate is fixedly connected between the edge of the upper surface of the sealing pipe and the top of the shell, a connecting rod is fixedly connected to the outer side of the bottom end of the piston rod, a strain rod is fixedly connected to the upper surface of the connecting rod, penetrates through the sealing ring, and the top end of the strain rod is tightly attached to the lower side of a rubber pad. Therefore, the strain gauge is deformed to achieve the purpose of detection.
(2) The negative pressure sensor with good stability for vacuum pump detection is connected with an adjusting turntable by embedding one side of the bottom end of a shell, an outer spiral rod is sleeved outside the fixed spiral rod, a fixed spiral rod is fixedly connected with the middle part of the total length of the lower surfaces of a piston rod and a connecting rod, an outer spiral rod is sleeved outside the fixed spiral rod, an outer cover is hinged outside the outer wall of the shell, which is close to the adjusting turntable, through a hinge, a sealing ring is arranged at the part of the outer cover, which is connected with the shell, the position of a strain rod can be adjusted by rotating the adjusting turntable, the negative pressure sensor can be adjusted before being used, so that the detection accuracy can be improved, the adjusting turntable can slide along the sliding groove rod, the distance between the adjusting turntable and the outer spiral rod can be kept when the negative pressure sensor works, the problem that detection is affected due to contact of the adjusting turntable and the outer spiral rod is avoided, and the connecting part of the adjusting turntable and the shell can be sealed by the outer cover when negative pressure is generated.
(3) This vacuum pump detects with steady sensor evenly has seted up the draw-in groove through the position of being connected at shell and solid fixed ring, the even fixedly connected with fixture block of solid fixed ring's inner circle, the interval and the size of fixture block are all the same with the draw-in groove, gu fixed ring includes first go-between and second go-between, first go-between rotates with the second go-between to be connected, and first go-between is kept away from the one end at rotation position with the second go-between and is fixed through the bolt, fixed subsides include knob and threaded rod, the bottom fixedly connected with connecting plate of threaded rod, disposable rubberizing is pasted to the lower surface of connecting plate, this device is through solid fixed ring and fixed subsides, can the adhesion inside detection device, and the connection between solid fixed ring and the shell is stable, fixed subsides simple to operate, and be convenient for changing disposable.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
FIG. 3 is a schematic view of the connection of the retaining ring of the present invention;
FIG. 4 is a front view of the retaining ring of the present invention;
fig. 5 is a schematic structural view of the fixing patch of the present invention.
In the figure, 1, a housing; 2. a strain gauge; 3. a circuit assembly; 4. a negative pressure bin; 5. a sealing tube; 6. a seal ring; 7. a piston rod; 8. a partition plate; 9. a connecting rod; 10. a strain rod; 11. a rubber pad; 12. a slide bar; 13. fixing the rod; 14. a connecting spring; 15. fixing the screw rod; 16. an outer screw rod; 17. adjusting the turntable; 18. a chute rod; 19. a slide bar; 20. a housing; 21. a fixing ring; 22. a fixing plate; 23. fixing and sticking; 24. a first connecting ring; 25. a second connection ring; 26. a clamping block; 27. a knob; 28. a threaded rod; 29. a connecting plate; 30. sticking glue for one time; 31. an internal thread; 32. an external thread; 33. a card slot; 34. an inner ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, an embodiment of the present invention provides a technical solution: a high-stability negative pressure sensor for vacuum pump detection comprises a shell 1, a strain gauge 2 and a circuit assembly 3, wherein the strain gauge 2 is electrically connected with the circuit assembly 3 through a lead-out wire inside the strain gauge 2, the strain gauge 2 works by a half-bridge method, the working process can adopt the process in the cited patent (publication number: CN202471333U) or the processes in other prior arts, the top end inside the shell 1 is fixedly connected with a negative pressure bin 4, a sealing pipe 5 is arranged at the lower side inside the shell 1 close to the negative pressure bin 4, a fixing ring 21 is sleeved outside the shell 1, a fixing plate 22 is fixedly connected to the side surface of the fixing ring 21, fixing pastes 23 are respectively connected to the two ends of the fixing plate 22 in a penetrating manner, clamping grooves 33 are uniformly arranged at the connecting part of the shell 1 and the fixing ring 21, clamping blocks 26 are uniformly and fixedly connected to the inner ring of the fixing ring 21, and the intervals and, the fixing ring 21 comprises a first connecting ring 24 and a second connecting ring 25, the first connecting ring 24 and the second connecting ring 25 are rotatably connected, one ends, far away from the rotating part, of the first connecting ring 24 and the second connecting ring 25 are fixed through bolts, the fixing sticker 23 comprises a knob 27 and a threaded rod 28, the bottom end of the threaded rod 28 is fixedly connected with a connecting plate 29, the lower surface of the connecting plate 29 is pasted with a disposable adhesive tape 30, an internal thread 31 is arranged inside the knob 27, an external thread 32 is arranged at the top end of the outer side of the threaded rod 28, the threaded rod 28 is meshed with the internal thread 31 through the external thread 32 and is connected with the knob 27, the length of the part provided with the external thread 32 is equal to the height of the fixing plate 22, the device can be adhered inside the detection device through the fixing ring 21 and the fixing sticker 23, the connection between the fixing ring 21 and the shell, and is convenient for replacing the disposable rubberizing 30, can improve the work efficiency during detection, the sealing ring 6 is fixedly connected between the sealing tube 5 and the inner wall of the shell 1, the piston rod 7 is connected in the sealing tube 5 in a sliding manner, the piston rod 7 and the sealing tube 5 are sealed, the top end of the piston rod 7 is positioned in the negative pressure bin 4, the piston rod 7 and the negative pressure bin 4 are tightly attached, the partition plate 8 is fixedly connected between the edge of the upper surface of the sealing tube 5 and the top of the shell 1, the partition plate 8 and the side wall of the shell 1 are both fixedly connected with the inner ring 34, the upper side of the inner ring 34 is fixedly connected with the rubber pad 11, the strain gage 2 is adhered to the upper surface of the rubber pad 11, the circuit assembly 3 is fixedly connected to the top of the shell 1 on the strain gage 2, the outer side of the bottom end of the piston rod, the device has the advantages that the strain rod 10 penetrates through the sealing ring 6, the strain rod 10 and the sealing ring 6 are subjected to sealing treatment, the top end of the strain rod 10 is tightly attached to the lower side of the rubber pad 11, the device is simple in structure and low in production cost, under the condition of negative pressure, the piston rod 7 can slide along the negative pressure bin 4 to drive the strain rod 10 to apply acting force on the rubber pad 11, so that the strain sheet 2 is deformed to achieve the detection purpose, the lower surfaces of the piston rod 7 and the connecting rod 9 are fixedly connected with the sliding rod 12, the inner part of the sliding rod 12 is slidably connected with the fixing rod 13, the bottom end of the fixing rod 13 is fixedly connected with the shell 1, the outer sides of the sliding rod 12 and the fixing rod 13 are respectively sleeved with the connecting spring 14, two ends of the connecting spring 14 are respectively fixedly connected with the piston rod 7, the connecting rod 9 and the shell 1, one side of the bottom end of the shell 1 is, a slide rod 19 is rotatably connected inside the adjusting turntable 17, two ends of the slide rod 19 slide inside the sliding groove rod 18, the total acting force of the slide rod 19 and the sliding groove rod 18 is greater than the sliding friction force between the slide rod 19 and the sliding groove rod 18, a fixed screw rod 15 is fixedly connected to the middle part of the total length of the lower surfaces of the piston rod 7 and the connecting rod 9, an external screw rod 16 is sleeved outside the fixed screw rod 15, threads are arranged on the outer surface of the fixed screw rod 15 and the inner surface of the external screw rod 16, the fixed screw rod 15 and the external screw rod 16 are connected in an occlusion way, a toothed ring is arranged on the outer surface of the external screw rod 16, one end of the adjusting turntable 17 is connected with the external screw rod 16 in an occlusion way, an outer cover 20 is hinged to the outer side of the outer wall of the shell 1 close to the adjusting turntable 17 through a hinge, the outer cover 20 is an arched component, the position that dustcoat 20 and shell 1 are connected is provided with the sealing washer, and this device can adjust the position of pole 10 that meets an emergency through rotating adjustment carousel 17, can adjust it before using the negative pressure sensor to can improve the degree of accuracy that detects, and adjustment carousel 17 can slide along chute bar 18, can keep the distance with outer spiral rod 16 when the negative pressure sensor work, avoid appearing leading to the problem that influences the detection rather than the contact, and dustcoat 20 can seal the position of being connected of adjustment carousel 17 and shell 1 when the negative pressure.
When the device is used, negative pressure is arranged on the outer side of the negative pressure sensor, the pressure inside the negative pressure sensor is higher than the pressure outside the negative pressure sensor, the piston rod 7 moves along the negative pressure bin 4, the connecting rod 9 drives the strain rod 9 to slide along the sealing ring 7 and stretch the connecting spring 14, the strain rod 9 exerts acting force on the rubber pad 11 when sliding, so that the rubber pad 11 and the strain foil 2 deform, the resistance changes after the strain foil 2 deforms, measurement can be performed, and the connecting spring 14 pulls the piston rod 7 and the connecting rod 9 to return to the original position after the pressure outside the strain foil 2 is reduced; when the sensor needs to be calibrated, the outer cover 20 is opened, the adjusting turntable 17 is pushed inwards along the sliding groove rod 18 until the adjusting turntable 17 is meshed with the outer spiral rod 16, then the adjusting turntable 17 is rotated, the adjusting turntable 17 drives the outer spiral rod 16 and the fixed spiral rod 15 to move relatively, the connecting rod 9 and the strain rod 10 are driven to displace, the distance between the strain rod 10 and the rubber pad 11 is changed, and the rubber pad 11 and the strain sheet 2 are prevented from continuously deforming; when the negative pressure sensor needs to be fixed on the detection device, the fixing ring 21 is firstly installed on the outer side of the shell 1, when the device is installed, the fixture blocks 26 of the fixing ring 21 are embedded into the clamping grooves 33, then the connecting parts of the first connecting ring 24 and the second connecting ring 25 in the fixing ring 21 are fixed by using bolts, then the disposable rubberizing 30 is pasted on the connecting plate 29, then the threaded rod 28 penetrates through the fixing plate 22, then the knob 27 is used for being installed on the threaded rod 28 through the meshing of the internal thread 31 and the external thread 32, then the protective sheet on the disposable rubberizing 30 is taken down, and the device is fixed to a required position through the fixing paster 23.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a vacuum pump detects with good negative pressure sensor of stability, includes shell (1), foil gage (2) and circuit assembly (3), through the inside lead-out wire electric connection of foil gage (2), its characterized in that between foil gage (2) and circuit assembly (3): the top end inside the shell (1) is fixedly connected with a negative pressure bin (4), a sealing pipe (5) is arranged on the lower side, close to the negative pressure bin (4), inside the shell (1), of the sealing pipe (5), a sealing ring (6) is fixedly connected between the sealing pipe (5) and the inner wall of the shell (1), a piston rod (7) is connected inside the sealing pipe (5) in a sliding mode, the top end of the piston rod (7) is located inside the negative pressure bin (4), the piston rod (7) and the negative pressure bin (4) are tightly attached, a partition plate (8) is fixedly connected between the edge of the upper surface of the sealing pipe (5) and the top of the shell (1), inner rings (34) are fixedly connected to the partition plate (8) and the side wall of the shell (1), a rubber pad (11) is fixedly connected to the upper side of the inner rings (34), and the strain gauge (2) is adhered to, the circuit assembly (3) is fixedly connected to the top of the shell (1) on the upper side of the strain gauge (2);
the utility model discloses a sealing device, including piston rod (7), connecting rod (9), fixed surface is connected with strain rod (10) on connecting rod (9), strain rod (10) run through sealing ring (6), and the top of strain rod (10) is hugged closely the downside at rubber pad (11), the equal fixedly connected with slide bar (12) of lower surface of piston rod (7) and connecting rod (9), the inside sliding connection of slide bar (12) has dead lever (13), the bottom and shell (1) fixed connection of dead lever (13), and the outside of slide bar (12) and dead lever (13) all overlaps and is equipped with coupling spring (14), the both ends of coupling spring (14) respectively with piston rod (7), connecting rod (9) and shell (1) fixed connection.
2. The negative pressure sensor with good stability for vacuum pump detection according to claim 1, wherein: the embedding of one side of shell (1) bottom is connected with adjustment carousel (17), and the equal fixedly connected with chute pole (18) in both sides that shell (1) is inside to be close to adjustment carousel (17), the inside rotation of adjustment carousel (17) is connected with slide bar (19), the both ends of slide bar (19) slide in the inside of chute pole (18), the total effort of slide bar (19) and chute pole (18) is greater than the slip frictional force between slide bar (19) and chute pole (18).
3. The negative pressure sensor with good stability for vacuum pump detection according to claim 2, wherein: the utility model discloses a fixed screw rod of adjusting carousel, including piston rod (7) and connecting rod (9) lower surface total length's middle part fixedly connected with fixed screw rod (15), the outside cover of fixed screw rod (15) is equipped with outer screw rod (16), and the surface of fixed screw rod (15) and the internal surface of outer screw rod (16) all are provided with the screw thread, fixed screw rod (15) and outer screw rod (16) between the interlock be connected, the surface of outer screw rod (16) is provided with the ring gear, the one end and the outer screw rod (16) interlock of adjustment carousel (17) are connected.
4. The negative pressure sensor with good stability for vacuum pump detection according to claim 3, wherein: the outer side that shell (1) outer wall is close to adjustment carousel (17) articulates through the hinge has dustcoat (20), dustcoat (20) are the component of an arch shape, and dustcoat (20) keep away from the one end embedding of hinge in the lateral wall of shell (1), the position that dustcoat (20) and shell (1) are connected is provided with the sealing washer.
5. The negative pressure sensor with good stability for vacuum pump detection according to claim 4, wherein: the outside cover of shell (1) is equipped with solid fixed ring (21), the side fixedly connected with fixed plate (22) of solid fixed ring (21), the both ends of fixed plate (22) all through connection have fixed subsides (23).
6. The negative pressure sensor with good stability for vacuum pump detection according to claim 5, wherein: draw-in groove (33) have evenly been seted up at the position that shell (1) and solid fixed ring (21) are connected, the even fixedly connected with fixture block (26) of inner circle of solid fixed ring (21), the interval and the size of fixture block (26) all are the same with draw-in groove (33).
7. The negative pressure sensor with good stability for vacuum pump detection according to claim 6, wherein: the fixing ring (21) comprises a first connecting ring (24) and a second connecting ring (25), the first connecting ring (24) and the second connecting ring (25) are rotatably connected, and one ends, far away from the rotating position, of the first connecting ring (24) and one ends, far away from the rotating position, of the second connecting ring (25) are fixed through bolts.
8. The negative pressure sensor with good stability for vacuum pump detection according to claim 5, wherein: fixed subsides (23) are including knob (27) and threaded rod (28), the bottom fixedly connected with connecting plate (29) of threaded rod (28), disposable rubberizing (30) are pasted to the lower surface of connecting plate (29), the inside of knob (27) is provided with internal thread (31), the top in threaded rod (28) outside is provided with external screw thread (32), and threaded rod (28) are connected with knob (27) through external screw thread (32) and internal thread (31) interlock, and threaded rod (28) are provided with the length at external screw thread (32) position and highly equal of fixed plate (22).
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| CN201910624395.5A CN110285915B (en) | 2019-07-11 | 2019-07-11 | Vacuum pump detects with good negative pressure sensor of stability |
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| CN201910624395.5A CN110285915B (en) | 2019-07-11 | 2019-07-11 | Vacuum pump detects with good negative pressure sensor of stability |
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| CN110285915B true CN110285915B (en) | 2021-05-07 |
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| CN101881680A (en) * | 2010-06-03 | 2010-11-10 | 南京工业职业技术学院 | Multifunctional pressure detecting and measuring switch |
| CN103900756A (en) * | 2014-04-16 | 2014-07-02 | 山东微感光电子有限公司 | Fiber bragg grating pressure sensor capable of achieving positive and negative pressure monitoring and testing method |
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