CN218471692U

CN218471692U - Multi-contact piece and mechanical pressure sensor

Info

Publication number: CN218471692U
Application number: CN202023332814.5U
Authority: CN
Inventors: 梁家刚
Original assignee: Wuhan Chidian Technology Co ltd
Current assignee: Wuhan Chidian Technology Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2023-02-10
Anticipated expiration: 2030-12-31

Abstract

The utility model provides a multi-contact piece and a mechanical pressure sensor, which prevent the misalignment of the overall pressure detection caused by the failure of the contact of a single contact and a metal wire row by arranging the multi-contact and the metal wire row; the integrally formed contact piece is convenient to machine and form, and the cost is lower; the through groove is arranged, the left side and the right side of the through groove are provided with the contact pieces, and the two contact pieces are simultaneously contacted with the metal wire, so that the contact reliability is ensured; the contact is pressed on the ceramic resistance chip more uniformly, the contact is more reliable, and the wear-resisting service life of the ceramic resistance chip is prolonged; after the multi-contact wafer of the utility model is adopted, the abrasion to metal is greatly reduced, silver slurry with lower palladium content can be adopted, and the production cost is reduced; 4 contacts are arranged and staggered up and down, so that the stress is more balanced, and the requirements of pressure sensing and high-pressure or low-pressure alarming can be met simultaneously.

Description

Multi-contact wafer and mechanical pressure sensor

Technical Field

The utility model relates to a pressure sensor field especially relates to a multicontact contact and mechanical type pressure sensor.

Background

The mechanical pressure sensor is widely applied to the fields of automobiles, ship power pipelines, water treatment engineering, industrial process detection and control, hydropneumatic control engineering and the like, and has the advantages of good vibration resistance, long service life, convenient installation, stable quality, reliable performance and wide working temperature range. It can be subdivided into oil pressure sensors, gas pressure sensors, etc. according to the field of application.

As shown in fig. 1, the core component of the mechanical pressure sensor is a contact a1 and a thick film resistor a2, the thick film resistor a2 includes a ceramic substrate a20, metal wires a21 are arranged on the ceramic substrate a20 side by side, the thick film resistor a22 is continuously coated between the adjacent metal wires a21, the metal wires a21 and the contact a1 in the zero position are respectively connected with a resistance detection device, when the external pressure changes, the contact a1 is driven to slide between the metal wires a21 arranged side by side, and the resistance value between the metal wires a21 and the contact a1 in the zero position changes, so as to reflect the change value of the external pressure.

However, in practical use, it is found that when the mechanical pressure sensor is used for a long time, the contact piece a1 repeatedly rubs against the metal wire a21 and the ceramic substrate a20, metal oxide particles are easily generated, and when the particles just adhere between the metal wire a21 and the contact piece a1, good electrical contact between the two is not maintained, so that the actually measured resistance value is large and unstable, and the pressure detection is misaligned.

In addition, in order to prevent the contact on the contact sheet a1 from separating from the metal wire a21, it is necessary to ensure that the contact sheet and the metal wire a21 are compressed, so that the contact sheet with a single contact has a large pressure to be in electrical contact with the metal wire a21, and the metal wire a21 generally adopts silver paste containing palladium, wherein the higher the palladium content of the silver paste is, the better the wear resistance is, the more expensive the price is, which also increases the cost.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a multicontact contact and mechanical type pressure sensor, the contact is good with the metal wire contact performance, and can reduce product cost.

The technical scheme of the utility model is realized like this:

on the one hand, the utility model provides a multicontact contact, it includes elastic contact body (1), seted up in the middle of elastic contact body (1) tip and run through groove (10), still include two at least contacts (2), contact (2) are extended to running through groove (10) by elastic contact body (1) that runs through groove (10) both sides and are formed.

On the basis of the technical scheme, preferably, 4 contacts (2) are arranged, and 2 contacts penetrate through the left side and the right side of the groove (10).

Further preferably, the 2 contacts (2) located on the same side of the through groove (10) include a common connecting portion (21), an extending portion (22), a contact portion (23) and an end portion (24), wherein the connecting portion (21) is formed by extending the elastic contact piece body (1) to one side of the through groove (10), the extending portion (22) is formed by extending the connecting portion (21) to the direction of the two end portions and the thickness direction of the elastic contact piece body (1), the contact portion (23) is formed by extending the extending portion (22) horizontally to one side of the through groove (10), and the end portion (24) is formed by extending the contact portion (23) to one side of the through groove (10) and warping upward to the thickness direction of the elastic contact piece body (1).

More preferably, the 2 contacts (2) positioned on the same side of the through groove (10) are integrally C-shaped and are connected with the elastic contact piece body (1) through a common connecting part (21).

More preferably, the 2 contacts (2) at one side of the through groove (10) and the contact parts (23) of the 2 contacts (2) at the other side of the through groove (10) are staggered along the direction of the end part of the elastic contact piece body (1).

On the basis of the technical scheme, preferably, the width of the through groove (10) is gradually reduced from one end close to the contact (2) to one end far away from the contact (2).

Further preferably, the through groove (10) is in the shape of a drop.

In a second aspect, the utility model provides a mechanical type pressure sensor, it includes thick film resistor piece (3) and support (4), thick film resistor piece (3) include ceramic substrate (30), a plurality of metal wire (31) and thick film resistor layer (32), are provided with a plurality of metal wire (31) on ceramic substrate (30) side by side, and thick film resistor layer (32) coats in succession between adjacent metal wire (31), and ceramic substrate (30) are fixed on support (4), still include the multi-contact of the first aspect of the invention, the one end and support (4) rotatable coupling of contact (2) are kept away from to elastic contact body (1), contact (2) and metal wire (31) sliding connection who sets up side by side.

Further preferably, the thick film resistor disc (3) further comprises a metal sheet (33), the metal sheet (33) is arranged on the surface of the ceramic substrate (30), a dividing line (330) is arranged in the middle of the metal sheet (33), the metal sheets (33) on two sides of the dividing line (330) are electrically non-conductive, and the contacts (2) are in sliding connection with the metal sheets (33).

Further preferably, the plurality of wires (31) are arranged in a fan shape, and the metal sheet (33) is in a fan shape, and the two fan shapes are concentric.

The utility model discloses a multicontact contact and mechanical type pressure sensor have following beneficial effect for prior art:

(1) Through arranging multiple contacts to contact with the metal wire row, the overall pressure detection misalignment caused by the contact failure of a single contact and the metal wire row is prevented; the integrally formed contact piece is convenient to machine and form, and the cost is lower; the through groove is arranged, the left side and the right side of the through groove are provided with the contact pieces, and the two contact pieces are simultaneously contacted with the metal wire, so that the contact reliability is ensured; the contact is pressed on the ceramic resistance chip more uniformly, the contact is more reliable, and the wear-resisting service life of the ceramic resistance chip is prolonged;

(2) After the multi-contact wafer of the utility model is adopted, the abrasion to metal is greatly reduced, and silver slurry with lower palladium content can be adopted, so that the production cost is reduced;

(3) 4 contacts are arranged and staggered up and down, so that the stress is more balanced, and the requirements of pressure sensing and high-pressure or low-pressure alarming can be met simultaneously.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a conventional mechanical pressure sensor;

fig. 2 is a front view of the multi-contact wafer of the present invention;

FIG. 3 is a perspective view of the multi-contact wafer of the present invention;

fig. 4 is a front view of a thick film resistor disc of the mechanical pressure sensor of the present invention;

fig. 5 is a front view of the mechanical pressure sensor of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in fig. 2, in combination with fig. 3, fig. 4 and fig. 5, the multi-contact wafer of the present invention includes an elastic wafer body 1 and at least two contacts 2. The utility model discloses a mechanical type pressure sensor still includes thick film resistance card 3 and support 4.

As shown in fig. 4, the thick film resistor sheet 3 includes a ceramic substrate 30, a plurality of metal lines 31, and a thick film resistor layer 32, the ceramic substrate 30 is provided with the plurality of metal lines 31 side by side, the thick film resistor layer 32 is continuously coated between adjacent metal lines 31, and the ceramic substrate 30 is fixed on the support 4. As shown in fig. 5, one end of the elastic contact piece body 1 far from the contact 2 is rotatably connected with the bracket 4, and the contact 2 is slidably connected with the metal wires 21 arranged side by side. Therefore, when the environmental pressure to be detected changes, the contact piece is pushed to slide between the metal wires 31, and the change of the resistance value between the metal wires 31 and the contact piece at the zero position can be reflected only by continuously detecting the change of the resistance value between the metal wires 31 and the contact piece.

Specifically, the metal wire 31 is generally formed by coating silver paste on the ceramic substrate 30 and further sintering, and may be formed by using the prior art.

Specifically, the middle of the end part of the elastic contact piece body 1 is provided with a through groove 10, and the elastic contact piece further comprises at least two contacts 2, wherein the contacts 2 are formed by extending the elastic contact piece body 1 at two sides of the through groove 10 into the through groove 10. Therefore, the contacts 2 are distributed on the elastic contact piece bodies 1 on two sides of the through groove 10, so that pressure can be uniformly dispersed on each contact 2, and the misalignment of overall pressure detection caused by the contact failure of a single contact and a metal wire row is prevented; the integrally formed contact piece is convenient to machine and form, and the cost is lower; set up and run through the groove, and set up the contact in the groove left and right sides that runs through, two contacts and metal wire contact simultaneously, guarantee the contact reliability.

And a part of mechanical pressure sensors are provided with a high-pressure or low-pressure alarm function, and when the air pressure is too high or too low, an alarm signal is sent out. Specifically, as shown in fig. 4, the thick film resistor sheet 3 further includes a metal sheet 33, the metal sheet 33 is disposed on the surface of the ceramic substrate 30, a dividing line 330 is disposed in the middle of the metal sheet 33, the metal sheets 33 on both sides of the dividing line 330 are electrically non-conductive, and the contacts 2 are slidably connected to the metal sheets 33. Thus, the metal sheet 33 on one side of the dividing line 330 is electrically conducted with the contact sheet after contacting with the contact sheet, when the contact 2 slides across the dividing line 330, the electric loop of the metal sheet 33 and the contact sheet is turned off from conduction or turned on from disconnection, thereby sending out a low-voltage or high-voltage alarm signal.

Preferably, the plurality of wires 31 are arranged in a fan shape, and the metal sheet 33 is in a fan shape, and two fan shapes are concentric.

For the mechanical pressure sensor with the structure, the number of the contacts 2 is 4, and the number of the contacts 2 is 2 respectively at the left side and the right side of the penetrating groove 10. The 2 contacts 2 located on the upper side slide on the wire 31, while the 2 contacts 2 located on the lower side slide on the metal sheet 33.

Preferably, the structure of the contact 2 is as follows: 2 contacts 2 located on the same side of the through groove 10 include a common connecting portion 21, an extending portion 22, a contact portion 23 and an end portion 24, wherein the connecting portion 21 is formed by extending the elastic contact piece body 1 to one side of the through groove 10, the extending portion 22 is formed by extending the connecting portion 21 to the directions of the two end portions of the elastic contact piece body 1 and the thickness direction, the contact portion 23 is formed by extending the extending portion 22 to one side of the through groove 10 horizontally, and the end portion 24 is formed by extending the contact portion 23 to one side of the through groove 10 and warping upward to the thickness direction of the elastic contact piece body 1. In this way, the contact portion 23 is recessed downward, sliding on the wire 31 or the metal piece 33, while the end portion 24 is raised up, preventing scratching. More preferably, the 2 contacts 2 located on the same side of the through slot 10 are C-shaped as a whole and are connected to the resilient contact body 1 by a common connection portion 21.

Preferably, the contact portions 23 of the 2 contacts 2 on one side of the through slot 10 and the 2 contacts 2 on the other side of the through slot 10 are staggered along the direction of the end of the elastic contact piece body 1.

Preferably, the width of the through slot 10 gradually decreases from the end close to the contact 2 to the end far away from the contact 2. So, with the one end that is close to support 4 wideer, intensity is higher, and whole elasticity is stronger, prevents to take place irreversible elastic deformation. Specifically, the through groove 10 is in the shape of a drop.

The utility model discloses a mechanical type pressure sensor theory of use as follows:

the elastic contact piece body 1 rotates around the bracket 4, in the process, the two upper contacts 2 slide between the metal wires 31, and the two lower contacts 2 slide on the metal sheet 33;

when the non-conductive particles are just clamped between a single contact 2 and the metal wire 31 or the metal sheet 33, the elastic contact piece body 1 inclines, and the rest contacts 2 can still be in contact with the metal wire 31 or the metal sheet 33, so that the contact between the elastic contact piece body 1 and the thick film resistor sheet 3 is ensured;

when the contact 2 slides across the dividing line 330, the electrical circuit of the metal sheet 33 and the contact sheet is switched from on to off or from off to on, so as to send out a low-voltage or high-voltage alarm signal.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a multicontact contact, its includes elastic contact body (1), its characterized in that: elastic contact body (1) tip middle seted up and run through groove (10), still include two at least contacts (2), contact (2) are extended to running through groove (10) by elastic contact body (1) that runs through groove (10) both sides and are formed.

2. The multi-contact blade of claim 1, wherein: the number of the contacts (2) is 4, and the number of the contacts penetrates through the left side and the right side of the groove (10) and is 2 respectively.

3. The multi-contact blade of claim 2, wherein: 2 contacts (2) located the same side of through groove (10) include common connecting portion (21), extension (22), contact site (23) and tip (24), wherein, connecting portion (21) are extended to one side of through groove (10) by elastic contact body (1) and are formed, extension (22) are extended to elastic contact body (1) both ends direction and thickness direction respectively by connecting portion (21) and are formed, contact site (23) are formed to one side horizontal extension of through groove (10) by extension (22), tip (24) are extended to one side of through groove (10) and are upwards perk to elastic contact body (1) thickness direction by contact site (23).

4. The multi-contact blade of claim 3, wherein: the 2 contacts (2) positioned on the same side of the through groove (10) are integrally C-shaped and are connected with the elastic contact piece body (1) through a common connecting part (21).

5. The multi-contact blade of claim 3, wherein: the contact parts (23) of the 2 contacts (2) positioned on one side of the through groove (10) and the 2 contacts (2) positioned on the other side of the through groove (10) are staggered along the end part direction of the elastic contact piece body (1).

6. The multi-contact blade of claim 1, wherein: the width of the through groove (10) from one end close to the contact (2) to one end far away from the contact (2) is gradually reduced.

7. The multi-contact blade of claim 6, wherein: the through groove (10) is in a water drop shape.

8. The utility model provides a mechanical type pressure sensor, its includes thick film resistor piece (3) and support (4), thick film resistor piece (3) are provided with a plurality of metal wires (31) on ceramic substrate (30) side by side including ceramic substrate (30), a plurality of metal wire (31) and thick film resistor layer (32), continuous coating thick film resistor layer (32) between adjacent metal wire (31), and ceramic substrate (30) are fixed on support (4), its characterized in that: the multi-contact blade of claim 1, wherein the end of the elastic contact blade body (1) far away from the contact (2) is rotatably connected with the bracket (4), and the contact (2) is slidably connected with the metal wires (31) arranged side by side.

9. The mechanical pressure sensor of claim 8, wherein: the thick-film resistor disc (3) further comprises a metal sheet (33), the metal sheet (33) is arranged on the surface of the ceramic substrate (30), a dividing line (330) is arranged in the middle of the metal sheet (33), the metal sheets (33) located on two sides of the dividing line (330) are electrically non-conductive, and the contacts (2) are in sliding connection with the metal sheet (33).

10. The mechanical pressure sensor of claim 9, wherein: the metal wires (31) are arranged in a fan shape, the metal sheets (33) are in a fan shape, and the two fan shapes are concentric.