CN211085547U

CN211085547U - Mechanical pressure sensor

Info

Publication number: CN211085547U
Application number: CN201922276228.4U
Authority: CN
Inventors: 梁家刚
Original assignee: Wuhan Chidian Technology Co ltd
Current assignee: Wuhan Chidian Technology Co ltd
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-07-24
Anticipated expiration: 2029-12-16

Abstract

The utility model provides a mechanical pressure sensor, through setting up silver metal wire and copper contact, copper and silver are hard one soft, through practice proving, its abrasion resistance can be better than the structure of silver metal wire and silver contact, and after changing to do the copper contact, contact and contact body can adopt integrated into one piece, the cost reduces by a wide margin, production efficiency is higher; the contact is formed by extending and bending the contact body, and compared with the existing elastic contact, the structure is greatly simplified without arranging an elastic sheet and a connecting piece of the elastic sheet and the contact, and the contact performance is not influenced; contacts are arranged on two sides of the contact piece body, so that the elastic contact piece is more stable and prevented from inclining to one side; set up the sheetmetal on thick film resistor piece, play the pressure warning effect, compare in prior art and set up the structure of a pressure protection shield alone, it is simpler, reduce cost.

Description

Mechanical pressure sensor

Technical Field

The utility model relates to a pressure sensor field especially relates to a 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 the product has 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. 5, the core components of the mechanical pressure sensor are an elastic contact piece 1 and a thick film resistor piece 2, the thick film resistor piece 2 includes a ceramic substrate 20, metal wires 21 are arranged on the ceramic substrate 20 side by side, a thick film resistor layer 22 is continuously coated between adjacent metal wires 21, the metal wires 21 and the elastic contact piece 1 at zero position are respectively connected with resistance detection equipment, when external pressure changes, the elastic contact piece 1 is driven to slide between the metal wires 21 arranged side by side, and the resistance value between the metal wires 21 and the elastic contact piece 1 at zero position changes, so as to reflect the change value of the external pressure.

Specifically, in actual use, the elastic contact piece 1 includes an elastic body 11, two elastic pieces are respectively arranged on the upper and lower surfaces of the elastic body 11, contacts are respectively fixed on the two elastic pieces, and the contacts are in contact with the metal wires 21 and slide between the metal wires 21 arranged side by side. The current mechanical pressure sensor generally adopts a silver metal wire 21 and a contact, and the following problems exist by adopting the structure:

(1) practical use proves that mutual abrasion is easy to occur between the silver metal wire 21 and the silver contact;

(2) because the silver contact is adopted, the volume is very small, the silver contact is inconvenient to be fixedly connected with the elastic sheet, the product yield is low, the production efficiency is low, and the cost of parts is also increased by the extra connecting pieces.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a mechanical type pressure sensor that stand wear and tear, low in production cost, efficient.

The technical scheme of the utility model is realized like this: the utility model provides a mechanical type pressure sensor, it includes elastic contact piece (1), thick film resistance card (2) and support (3), wherein, thick film resistance card (2) are fixed on support (3), thick film resistance card (2) include ceramic substrate (20), a plurality of metal wire (21) and thick film resistance layer (22), are provided with a plurality of metal wire (21) on ceramic substrate (20) side by side, and thick film resistance layer (22) coats in succession between adjacent metal wire (21), and elastic contact piece (1) one end and support (3) rotatable coupling, the other end are provided with contact (10) to through contact (10) and metal wire (21) sliding connection; the metal wire (21) is made of silver, and the contact (10) is made of copper.

On the basis of the above technical solution, preferably, the elastic contact piece (1) includes a contact piece body (11), and the contact (10) is formed by extending and bending the contact piece body (11) toward the ceramic substrate (20).

On the basis of the above technical solution, preferably, two contacts (10) are provided, and are arranged side by side with each other.

On the basis of the technical scheme, preferably, the number of the contacts (10) is four, every two contacts are arranged side by side and located on two sides of the contact piece body (11), two contacts on one side are connected with the metal wire (21) in a sliding mode, and two contacts on the other side are supported by the ceramic substrate (20).

On the basis of the technical scheme, preferably, the thick-film resistor disc (2) further comprises a metal sheet (23), the metal sheet (23) is arranged on the surface of the ceramic substrate (20), a dividing line (230) is arranged in the middle of the metal sheet (23), the metal sheets (23) on two sides of the dividing line (230) are electrically non-conductive, two contacts (10) on one side of the contact plate body (11) are respectively in sliding connection with the metal line (21), and two contacts (10) on the other side of the contact plate body are respectively in sliding connection with the metal sheet (23).

On the basis of the technical scheme, preferably, still include metal casing (4) and first utmost point post (5), first utmost point post (5) are fixed on metal casing (4), one of them metal wire (21) and first utmost point post (5) electric connection, and elastic contact (1) and metal casing (4) electric connection, elastic contact (1), resistance thick film piece (2) and support (3) set up in metal casing (4).

On the basis of the technical scheme, the electric pole socket is preferred to further comprise a second pole column (6), the second pole column (6) is fixed on the metal shell (4), and the metal sheet (23) is electrically connected with the second pole column (6).

The utility model discloses a mechanical type pressure sensor has following beneficial effect for prior art:

(1) by arranging the silver metal wire and the copper contact, the copper and the silver are hard and soft, the wear resistance of the contact is better than the structure of the silver metal wire and the silver contact, and after the copper contact is replaced, the contact and the contact body can be integrally formed, so that the cost is greatly reduced, and the production efficiency is higher;

(2) the contact is formed by extending and bending the contact body, and compared with the existing elastic contact, the structure is greatly simplified without arranging an elastic sheet and a connecting piece of the elastic sheet and the contact, and the contact performance is not influenced;

(3) contacts are arranged on two sides of the contact piece body, so that the elastic contact piece is more stable and prevented from inclining to one side;

(4) set up the sheetmetal on thick film resistor piece, play the pressure warning effect, compare in prior art and set up the structure of a pressure protection shield alone, it is simpler, reduce cost.

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 perspective view of a mechanical pressure sensor according to the present invention;

fig. 2 is a top view of the mechanical pressure sensor of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

fig. 4 is a perspective view of the elastic contact piece of the mechanical pressure sensor of the present invention;

fig. 5 is a front view of a thick film resistor disc 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. 1, with reference to fig. 2 and fig. 3, the mechanical pressure sensor of the present invention includes an elastic contact piece 1, a thick film resistor 2, a bracket 3, a metal casing 4, a first pole 5 and a second pole 6.

Wherein, the thick film resistor disc 2 is fixed on the bracket 3. As shown in fig. 5, the thick film resistor sheet 2 includes a ceramic substrate 20, a plurality of metal wires 21, a thick film resistor layer 22 and a metal sheet 23, the plurality of metal wires 21 are arranged on the ceramic substrate 20 side by side, and the thick film resistor layer 22 is continuously coated between the adjacent metal wires 21, so that the resistors between any two metal wires 21 are different, and when the elastic contact piece 1 slides between the metal wires 21, the resistance value changes, so as to reflect the change of the pressure.

As shown in fig. 4, one end of the elastic contact piece 1 is rotatably connected with the bracket 3, and the other end is provided with a contact 10 and is slidably connected with the metal wire 21 through the contact 10. Specifically, the metal wire 21 is made of silver, and the contact 10 is made of copper. By arranging the silver metal wire 21 and the copper contact 10, the copper and the silver are hard and soft, and practice proves that the wear resistance of the elastic contact piece 1 is better than that of the structure of the silver metal wire and the silver contact, and after the copper contact is replaced, the elastic contact piece 1 can be integrally formed, so that the cost is greatly reduced, and the production efficiency is higher.

In a preferred embodiment, the elastic contact piece 1 comprises a contact piece body 11, and the contact 10 is formed by extending and bending the contact piece body 11 towards the ceramic substrate 20. The contact 10 and the contact body 11 which are integrally formed are compared with the existing elastic contact, and an elastic sheet and a connecting piece of the elastic sheet and the contact are not required to be arranged, so that the structure is greatly simplified, and the contact performance is not influenced. Specifically, the number of the contacts 10 is two, and the contacts are arranged side by side with each other. The problem of poor contact of the individual contacts 10 is prevented.

In a preferred embodiment, the contacts 10 are four, two by two and arranged side by side and two by side on two sides of the contact body 11, wherein two of the contacts on one side are slidably connected to the wires 21, and two of the contacts on the other side are supported by the ceramic substrate 20. Thus, the contacts 10 are respectively arranged on two sides of the contact plate body 11, so that the elastic contact plate 1 is more stable and prevented from inclining to one side.

In a preferred embodiment, the thick-film resistor sheet 2 further includes a metal sheet 23, the metal sheet 23 is disposed on the surface of the ceramic substrate 20, a dividing line 230 is disposed in the middle of the metal sheet 23, the metal sheets 23 on both sides of the dividing line 230 are electrically non-conductive, the two contacts 10 on one side of the contact body 11 are respectively connected with the metal line 21 in a sliding manner, and the two contacts 10 on the other side are respectively connected with the metal sheet 23 in a sliding manner. The metal sheet 23 is provided with a pressure alarm device, the elastic contact piece 1 and the metal sheet 23 form an electric loop, when the pressure is too high or too low, and the elastic contact piece 1 crosses the dividing line 230, the electric loop between the elastic contact piece 1 and the metal sheet 23 is switched off from conduction to switching-on or switched on from switching-off to switching-on, so that a pressure alarm signal is sent to the outside.

Specifically, as a circuit connection part, the first terminal 5 is fixed on the metal casing 4, one of the metal wires 21 is electrically connected with the first terminal 5, the elastic contact piece 1 is electrically connected with the metal casing 4, and the elastic contact piece 1, the thick film resistor piece 2 and the bracket 3 are arranged in the metal casing 4.

Specifically, the device further comprises a second pole 6, the second pole 6 is fixed on the metal shell 4, and the metal sheet 23 is electrically connected with the second pole 6.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the 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. A mechanical pressure sensor comprises an elastic contact piece (1), a thick-film resistor disc (2) and a support (3), wherein the thick-film resistor disc (2) is fixed on the support (3), the thick-film resistor disc (2) comprises a ceramic substrate (20), a plurality of metal wires (21) and a thick-film resistor layer (22), the ceramic substrate (20) is provided with the plurality of metal wires (21) side by side, the thick-film resistor layer (22) is continuously coated between the adjacent metal wires (21), one end of the elastic contact piece (1) is rotatably connected with the support (3), the other end of the elastic contact piece is provided with a contact (10), and the elastic contact piece is in sliding connection with the metal wires (21) through the contact (10); the method is characterized in that: the metal wire (21) is made of silver, and the contact (10) is made of copper.

2. The mechanical pressure sensor of claim 1, wherein: the elastic contact piece (1) comprises a contact piece body (11), and the contact (10) is formed by extending and bending the contact piece body (11) towards the ceramic substrate (20).

3. The mechanical pressure sensor of claim 2, wherein: the number of the contacts (10) is two, and the contacts are arranged side by side.

4. The mechanical pressure sensor of claim 3, wherein: the four contacts (10) are arranged in pairs, are arranged side by side and are respectively arranged on two sides of the contact piece body (11), wherein two contacts on one side are respectively in sliding connection with the metal wire (21), and two contacts on the other side are supported by the ceramic substrate (20).

5. The mechanical pressure sensor of claim 4, wherein: the thick film resistor disc (2) further comprises a metal sheet (23), the metal sheet (23) is arranged on the surface of the ceramic substrate (20), a dividing line (230) is arranged in the middle of the metal sheet (23), the metal sheets (23) located on two sides of the dividing line (230) are electrically non-conductive, two contacts (10) on one side of the contact plate body (11) are respectively in sliding connection with the metal line (21), and two contacts (10) on the other side of the contact plate body are respectively in sliding connection with the metal sheet (23).

6. The mechanical pressure sensor of claim 5, wherein: still include metal casing (4) and first utmost point post (5), first utmost point post (5) are fixed on metal casing (4), one of them metal wire (21) and first utmost point post (5) electric connection, and elastic contact (1) and metal casing (4) electric connection, elastic contact (1), thick film resistance card (2) and support (3) set up in metal casing (4).

7. The mechanical pressure sensor of claim 6, wherein: the electric connector also comprises a second pole column (6), the second pole column (6) is fixed on the metal shell (4), and the metal sheet (23) is electrically connected with the second pole column (6).