CN217304374U

CN217304374U - Negative pressure sensor

Info

Publication number: CN217304374U
Application number: CN202221128312.7U
Authority: CN
Inventors: 辛小祥
Original assignee: Shandong Anada Sensor Co ltd
Current assignee: Shandong Anada Sensor Co ltd
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2022-08-26
Anticipated expiration: 2032-05-12

Abstract

The utility model relates to a negative pressure sensor field specifically is a negative pressure sensor, including epitheca, inferior valve, epitheca terminal, inferior valve terminal, PCB board, the PCB board is connected with epitheca terminal, inferior valve terminal electricity, still includes initiative shell fragment, passive shell fragment and clamp plate, passive shell fragment includes protruding contact site, horizontal contact portion, side contact portion, initiative shell fragment can contact with protruding contact site, the clamp plate presses on horizontal contact portion to extrude side contact portion contact inferior valve terminal, clamp plate fixed connection is in the inferior valve, the initiative shell fragment is located passive shell fragment protruding contact site top and fixes in the inferior valve. The process complexity and the product cost are reduced, and the reliability of the product is improved.

Description

Negative pressure sensor

Technical Field

The utility model relates to a negative pressure sensor technical field specifically is a negative pressure sensor.

Background

The negative pressure sensors for testing the pipeline blockage of the engine in the existing market are of two types, and one type with a chip is expensive; the other switch type is a spring control type, wherein the spring control type has an unstable phenomenon after long-term use, and a relatively stable spring plate structure type adopts two installation modes in the market: one is that the elastic sheet is firstly installed on the plastic piece and then is subjected to secondary injection molding, so that the mold cost and the product cost are high, the process is relatively complex, and the rejection rate is high; the other is a mode of pressing the elastic sheet by gluing the plastic piece, and the mode easily causes the unstable state of the elastic sheet due to the aging of glue and other problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a negative pressure sensor of reliable connected mode to solve current negative pressure sensor preparation product cost height, use unstability for a long time and because of the higher scheduling problem of ageing disability rate.

The utility model provides a negative pressure sensor draws together epitheca, inferior valve, epitheca terminal, inferior valve terminal, PCB board, the PCB board is connected with epitheca terminal, inferior valve terminal electricity, still includes initiative shell fragment, passive shell fragment and clamp plate, passive shell fragment includes protruding contact site, horizontal contact portion, side contact portion, the initiative shell fragment can contact with protruding contact site, the clamp plate is pressed on horizontal contact portion to extrude side contact portion contact inferior valve terminal, clamp plate fixed connection is in the inferior valve, the initiative shell fragment is located passive shell fragment protruding contact site top and fixes in the inferior valve.

Preferably, the contact part on the side surface of the passive elastic sheet is in interference fit with the lower shell terminal.

Preferably, the contact part on the side surface of the passive elastic sheet is provided with a convex hull which is in point contact with the lower shell terminal.

Preferably, the elastic sheet type power transmission device further comprises a sealing gasket and a push rod, wherein the sealing gasket is arranged between the upper shell and the lower shell, and the push rod is fixed on the sealing gasket above the active elastic sheet.

Preferably, still include the sealing washer, the sealing washer sets up between the inferior valve and the epitheca of fixed PCB board one side.

Preferably, the upper shell and the lower shell for fixing the PCB are sealed by pouring glue.

Preferably, the pressure plate is fixed on the lower case by screws.

The utility model discloses the beneficial effect who gives does: the positive surface of the passive elastic sheet is not stressed, the side surface of the passive elastic sheet is stressed, the problems of uneven stress and influence on a measured value are effectively solved, the connection mode is simple, and the effects of reducing the process complexity and the product cost and improving the product reliability are achieved; the contact mode of the side contact part of the passive elastic sheet and the lower shell terminal is point contact, so that the contact reliability is ensured; the fixed mode of passive shell fragment need not to use glue, does not have because of gluing ageing and lead to the unstable problem of product state.

Drawings

FIG. 1: the utility model discloses a cross section of a negative pressure sensor,

FIG. 2: the utility model is a three-dimensional view of the internal structure of the lower shell of the negative pressure sensor,

FIG. 3: the utility model relates to a partial contact sectional view of a pressure plate, a passive spring plate and a terminal of a negative pressure sensor,

FIG. 4: an enlarged view at B of figure 3 is shown,

FIG. 5: the utility model discloses negative pressure sensor's passive shell fragment structure chart.

The labels in the figure are: the device comprises an upper shell 1, a lower shell 2, a sealing gasket 3, a mandril 4, an active shrapnel 5, a passive shrapnel 6, a pressing plate 7, a PCB (printed circuit board) 8, a sealing ring 9, a screw 10, an upper shell terminal 11, a lower shell terminal 21, an air suction opening 22, a sealing gasket groove 23, a passive shrapnel convex contact part 61, a passive shrapnel horizontal contact part 62, a passive shrapnel side contact part 63, a convex hull 64 and a convex point 65.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.

In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for the purpose of illustrating the present invention and not for the purpose of limiting the same.

As shown in fig. 1 and 2, the negative pressure sensor provided in this embodiment includes an upper casing 1, a lower casing 2, a sealing gasket 3, a plunger 4, an active elastic sheet 5, a passive elastic sheet 6, a pressing plate 7, a PCB board 8, a sealing ring 9, a screw 10, an upper casing terminal 11, a lower casing terminal 21, an air suction port 22, and a sealing gasket groove 23. Two lower case terminals 21 are contained in the lower case 2. Contain two cavities in the inferior valve 2, passive shell fragment 6 is installed in the cavity of right side, and passive shell fragment 6 includes protruding contact site 61, horizontal contact site 62, side contact site 63, and its side contact site 63 is equipped with convex closure 64, and rather than one inferior valve terminal 21 contact, be equipped with bump 65 on the protruding contact site 61, negative pressure sensor during operation, with the contact of another inferior valve terminal 21. The pressing plate 7 is brought into contact with the horizontal contact portion 62 of the passive leaf spring 6 and presses the side contact portion 63 into contact with one of the lower shell terminals 21. The size of the notch part of the pressure plate 7 is matched with the size of the convex contact part 61 of the passive elastic sheet 6, so that the convex contact part 61 can be exposed in a protruding way, and the action of the convex contact part is not influenced. The pressing plate 7 is fixedly connected to the lower shell 2 through the screw 10, and the horizontal contact part 62 of the passive elastic sheet 6 is guaranteed not to be stressed. The lower case 2 contains a suction opening 22 therein. The active shrapnel 5 is positioned above the convex contact part 61 of the passive shrapnel 6 and fixed in the lower shell 2 and can contact with the convex contact part 61 of the passive shrapnel 6. Sealing pad 3 sets up between epitheca 1 and inferior valve 2, and ejector pin 4 is connected in sealing pad 3, fixes together in the seal groove 23 of inferior valve 2, guarantees to seal in the pad 3 except taking out a mouthful gas 22, and other positions are isolated with external.

As shown in fig. 3, 4 and 5, in order to ensure that the passive elastic sheet 6 is uniformly and reliably stressed and the horizontal contact portion 62 is not stressed, the pressing plate 7 presses the side contact portion 63 of the passive elastic sheet 6 through the side surface to make the passive elastic sheet 6 contact with one of the lower shell terminals 21 at an effective point, the contacted side contact portion 63 is provided with a convex hull 64 for contact, and the side contact portion 63 of the lower shell terminal 21 and the passive elastic sheet 6 is ensured to be in interference fit, so that the contact between the two is stable.

The upper case 1 includes an upper case terminal 11 for connecting an external and internal circuit. The upper shell terminal 11 is conducted with the PCB board 8 by a soldering wire.

The PCB board 8 is installed in the left cavity of the lower shell 2 and fixedly connected with the two lower shell terminals 21, so that the PCB board 8 is electrically connected with the upper shell terminal 11 and the two lower shell terminals 21. Adopt the mode of encapsulating to seal in the 8 installation cavities of PCB board, also can adopt sealing washer 9 to seal, sealing washer 9 sets up between inferior valve 2 and the epitheca 1 of fixed PCB board 8 one side.

The upper shell 1 and the lower shell 2 are fixedly connected through screws 10.

In the state where the negative pressure sensor is not operated, the side contact portion 63 of the passive leaf spring 6 is in contact with only one of the lower case terminals 21. When the air in the negative pressure sensor is pumped out through the air pumping port 22 of the lower shell 2 and negative pressure is generated, the sealing gasket 3 drives the ejector rod 4 to move downwards, the ejector rod moves downwards to the active elastic sheet 5 in the moving-down process, the active elastic sheet 5 deforms when reaching a required pressure value, the active elastic sheet contacts with the convex contact part 61 of the passive elastic sheet 6 and drives the convex contact part to move downwards, the convex point 65 of the convex contact part 61 of the passive elastic sheet 6 contacts with the other lower shell terminal 21, and therefore the circuit is switched on.

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

1. The utility model provides a negative pressure sensor, includes epitheca, inferior valve, epitheca terminal, inferior valve terminal, PCB board, the PCB board is connected its characterized in that with epitheca terminal, inferior valve terminal electricity: still include initiative shell fragment, passive shell fragment and clamp plate, passive shell fragment includes protruding contact site, horizontal contact portion, side contact portion, initiative shell fragment and protruding contact site contactability, the clamp plate is pressed on horizontal contact portion to extrude side contact portion contact inferior valve terminal, clamp plate fixed connection is in the inferior valve, the initiative shell fragment is located passive shell fragment protruding contact portion top and fixes in the inferior valve.

2. The negative pressure sensor according to claim 1, wherein: the contact part on the side surface of the passive elastic sheet is in interference fit with the lower shell terminal.

3. The negative pressure sensor of claim 2, wherein: and the contact part on the side surface of the passive elastic sheet is provided with a convex hull which is in point contact with the lower shell terminal.

4. The negative pressure sensor according to claim 1, characterized in that: the elastic sheet type power transmission device is characterized by further comprising a sealing gasket and an ejector rod, wherein the sealing gasket is arranged between the upper shell and the lower shell, and the ejector rod is fixed on the sealing gasket located above the active elastic sheet.

5. The negative pressure sensor according to claim 1, wherein: still include the sealing washer, the sealing washer sets up between the inferior valve and the epitheca of fixed PCB board one side.

6. The negative pressure sensor according to claim 1, wherein: and glue is filled between the upper shell and the lower shell for fixing the PCB for sealing.

7. The negative pressure sensor according to claim 1, wherein: the pressing plate is fixed on the lower shell through screws.