CN210607105U

CN210607105U - Air pressure switch

Info

Publication number: CN210607105U
Application number: CN201922143422.5U
Authority: CN
Inventors: 何玲; 李中华
Original assignee: Dongguan Xinxi Plastic Cement Electronic Co ltd
Current assignee: Dongguan Xinxi Plastic Cement Electronic Co ltd
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-05-22
Anticipated expiration: 2029-12-03

Abstract

The utility model provides an air pressure switch, including upper cover, lower cover and spring assembly, be equipped with deformable diaphragm between upper cover and the lower cover, the edge of diaphragm all with upper cover and lower cover sealing connection, the lower surface of diaphragm is equipped with the contact piece, cover down and be equipped with the contact pilotage, spring assembly includes down force spring and last pressure spring, form the epicoele between upper cover and the diaphragm, form the cavity of resorption between lower cover and the diaphragm, it is located epicoele and cavity of resorption respectively to go up pressure spring and down force spring, the upper cover is equipped with the bleeder vent, go up bleeder vent and external intercommunication, the lower cover is equipped with down the bleeder vent, the bleeder vent is connected with the vacuum tube down. The utility model discloses the structure sets up simple reasonable, can improve the sensitivity of baroswitch, avoids the diaphragm to weaken because of long-term back resilience force of using, improves stability and reliability, simultaneously, can normal work at certain load within range by the protective apparatus, avoids equipment to cause the damage because of the load is too high.

Description

Air pressure switch

Technical Field

The utility model relates to a pressure switch technical field, concretely relates to air pressure switch.

Background

The air pressure switch mainly comprises a shell, an elastic diaphragm, a contact piece and a contact pin, wherein the shell is divided into two cavities by the elastic diaphragm, air in the cavities is pumped out to generate air pressure difference, the elastic diaphragm is deformed, the contact piece is contacted with the contact pin, and therefore the contact pin is conducted. The existing elastic diaphragm is mainly made of a silica gel material, after the existing elastic diaphragm is used for a long time, the silica gel becomes fatigue and sinks, the resilience force is weakened, the original position cannot be recovered, the sensitivity is reduced, the air pressure switch is unstable in work, and the reliability is low.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the disappearance that prior art exists, provide an air pressure switch, its structure sets up simply rationally, can improve air pressure switch's sensitivity, avoids the diaphragm to weaken because of long-term back resilience force that uses, improves stability and reliability, simultaneously, can the normal work of protective apparatus in certain load range, avoids equipment to cause the damage because of the load is too high.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a pneumatic switch comprises an upper cover, a lower cover and a spring group, wherein a deformable membrane is arranged between the upper cover and the lower cover, the edges of the diaphragm are hermetically connected with the upper cover and the lower cover, the lower surface of the diaphragm is provided with a contact piece, the lower cover is provided with a contact pin corresponding to the contact pin, the spring group comprises a lower pressure spring which enables the contact pin to always have the trend of moving away from the contact pin and an upper pressure spring which enables the contact pin to always have the trend of moving towards the contact pin, an upper cavity is formed between the upper cover and the diaphragm, a lower cavity is formed between the lower cover and the diaphragm, the upper pressure spring and the lower pressure spring are respectively positioned in the upper cavity and the lower cavity, the outer surface of the upper cover is provided with an upper air hole communicated with the upper cavity, the upper air hole is communicated with the outside, the outer surface of the lower cover is provided with a lower air hole communicated with the lower cavity, and the lower air hole is connected with a vacuum tube.

As a preferred scheme, the upper cover is provided with an adjusting screw and a mounting hole for mounting the adjusting screw, the mounting hole is communicated with the upper cavity, the lower end of the adjusting screw is provided with an upper spring groove, and two ends of the upper pressure spring are respectively abutted against the top of the upper spring groove and the upper surface of the diaphragm.

Preferably, the mounting hole has a threaded connection portion located at the lower portion and a nail head accommodating portion located at the upper portion, the threaded connection portion is provided with an internal thread, the adjusting screw is screwed with the internal thread, a screw limiting rib for preventing the adjusting screw from loosening is arranged on a side wall surface of the nail head accommodating portion, the screw limiting rib extends along the axis direction of the mounting hole, and a screw limiting groove corresponding to the screw limiting rib is arranged on the outer surface of the head of the adjusting screw.

As a preferred scheme, be equipped with the reference column that corresponds with last spring pocket on the diaphragm, be equipped with the spring mounting groove on the reference column, go up pressure spring and install in the spring mounting groove.

As a preferable scheme, the lower surface of the diaphragm is provided with a mushroom head which protrudes downwards, the mushroom head comprises a mushroom head body and an annular groove connected with the diaphragm, the contact piece is provided with a contact piece through hole corresponding to the annular groove, and the contact piece penetrates through the mushroom head body through the contact piece through hole and is installed on the annular groove.

As a preferred scheme, a lower spring groove is formed in the lower cover, the lower pressure spring is sleeved on the outer side of the mushroom head, and two ends of the lower pressure spring are respectively abutted against the lower surface of the contact piece and the bottom of the lower spring groove.

Preferably, the contact pins are provided with two contact pins, the two contact pins are conducted through the contact piece, the lower cover is provided with a positioning through hole for installing the contact pin, the contact pin is tightly matched and connected with the positioning through hole, one end, close to the contact piece, of the contact pin is provided with a head portion for preventing the contact pin from falling off, and one end, far away from the contact piece, of the contact pin penetrates through the positioning through hole and extends outwards.

As a preferable scheme, the upper vent hole is formed in the upper surface of the upper cover, and the lower vent hole is formed in the side wall surface of the lower cover.

Preferably, the spring sets are provided in two sets, each of the two sets including an upper pressure spring and a lower pressure spring, the contact pieces including a first contact piece and a second contact piece, and the contact pins including a first contact pin corresponding to the first contact piece and a second contact pin corresponding to the second contact piece.

Preferably, the first contact pins are two in number, the two first contact pins are conducted through the first contact piece, the second contact pins are two in number, the two second contact pins are conducted through the second contact piece, and a distance between the first contact pins and the first contact piece is smaller than a distance between the second contact pins and the second contact piece.

Compared with the prior art, the utility model has obvious advantages and beneficial effects, specifically, 1, through setting up compression spring and lower compression spring in the upper and lower both sides of diaphragm to needn't rely on the resilience force of diaphragm self to resume initial position, can improve the sensitivity of baroswitch, avoid the diaphragm to weaken because of the resilience force after long-term use, improve the reliability; 2. the side wall surface of the mounting hole is provided with the screw limiting rib, the outer surface of the head of the adjusting screw is provided with the screw limiting groove, the adjusting screw is prevented from rotating, meanwhile, the upper end of the upper pressure spring is pressed against the adjusting screw, so that the adjusting screw has upward pretightening force, the adjusting screw is prevented from loosening, the structure is simple and reasonable to set, and the stability is improved; 3. through setting up first contact piece and second contact piece to and first contact pin and second contact pin, the distance between first contact pin and the first contact piece is less than the distance between second contact pin and the second contact piece, and during operation, first contact piece is earlier with first contact pin contact and switch on, then the second contact piece contacts and switches on with two second contact pins, thereby can protect equipment normal work in certain load range, avoid equipment to cause the damage because of the load is too high.

To more clearly illustrate the structural features and technical means of the present invention and the specific objects and functions achieved thereby, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:

drawings

Fig. 1 is a top view of an embodiment of the present invention;

fig. 2 is a cross-sectional view of an embodiment of the invention;

FIG. 3 is an exploded view of an embodiment of the present invention;

fig. 4 is a schematic structural view of an adjusting screw according to an embodiment of the present invention;

fig. 5 is a top view of another embodiment of the present invention.

The attached drawings indicate the following:

10-upper cover; 11-arranging air holes; 12-an upper pressure spring;

13-mounting holes; 131-screw limiting ribs; 20-lower cover;

21-a lower pressure spring; 22-lower spring groove; 23-a first contact pin;

231-a head; 24-a second contact pin; 25-lower air holes;

30-a membrane; 31-a locating post; 311-spring mounting groove;

32-mushroom heads; 33-a first contact pad; 34-a second contact pad;

40-adjusting screws; 41-screw limit groove; 42-upper spring groove.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the indicated position or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

As shown in fig. 1 to 5, a pneumatic switch comprises an upper cover 10, a lower cover 20 and a spring assembly, wherein a deformable membrane 30 is arranged between the upper cover 10 and the lower cover 20, the edges of the membrane 30 are hermetically connected with the upper cover 10 and the lower cover 20, a contact piece is arranged on the lower surface of the membrane 30, a contact pin corresponding to the contact piece is arranged on the lower cover 20, the spring assembly comprises a lower pressure spring 21 which enables the contact piece to always have a tendency of moving away from the contact pin and an upper pressure spring 12 which enables the contact piece to always have a tendency of moving towards the contact pin, a mushroom head 32 which protrudes downwards is arranged on the lower surface of the membrane 30, the mushroom head 32 comprises a mushroom head 32 body and an annular groove which is connected with the membrane 30, a contact piece through hole corresponding to the annular groove is arranged on the contact piece, the contact piece passes through the mushroom head 32 body and is arranged on the annular groove, be equipped with down spring groove 22 in the lower cover 20, the cover of down force spring 21 is in the mushroom head 32 outside, the both ends of down force spring 21 are contradicted with the lower surface of contact piece and the bottom of lower spring groove 22 respectively, form the epicoele between upper cover 10 and the diaphragm 30, form the cavity down between lower cover 20 and the diaphragm 30, it is located epicoele and cavity down respectively to go up force spring 12 and down force spring 21, the surface of upper cover 10 is equipped with the last bleeder vent 11 with the epicoele intercommunication, go up bleeder vent 11 and external intercommunication, the surface of lower cover 20 is equipped with the lower bleeder vent 25 with the cavity down intercommunication, bleeder vent 25 is connected with down, go up 11 upper surface that put upper cover 10 of bleeder vent, bleeder vent 25 is located the side wall surface of lower cover 20.

The upper cover 10 is provided with an adjusting screw 40 and a mounting hole 13 for mounting the adjusting screw 40, the mounting hole 13 is communicated with the upper cavity, the lower end of the adjusting screw 40 is provided with an upper spring groove 42, two ends of the upper pressure spring 12 are respectively abutted against the top of the upper spring groove 42 and the upper surface of the diaphragm 30, the mounting hole 13 is provided with a threaded connection part at the lower part and a nail head accommodating part at the upper part, the threaded connection part is provided with an internal thread, the adjusting screw 40 is in threaded connection with the internal thread, the side wall surface of the nail head accommodating part is provided with a screw limiting rib 131 for preventing the adjusting screw 40 from loosening, the screw limiting rib 131 extends along the axial direction of the mounting hole 13, the outer surface of the head 231 of the adjusting screw 40 is provided with a screw limiting groove 41 corresponding to the screw limiting rib 131, the diaphragm 30 is provided with a positioning column 31 corresponding to the upper, a spring installation groove 311 is formed in the positioning column 31, and the upper pressure spring 12 is installed in the spring installation groove 311.

The lower cover 20 is provided with a positioning through hole for installing a contact pin, the contact pin is tightly matched and connected with the positioning through hole, one end of the contact pin, which is close to the contact piece, is provided with a head 231 for preventing the contact pin from falling off, the outer diameter of the head 231 is larger than the inner diameter of the positioning through hole, and one end of the contact pin, which is far away from the contact piece, penetrates through the positioning through hole and extends outwards.

In this embodiment, the spring set is provided with two sets, each of the two sets includes an upper pressure spring 12 and a lower pressure spring 21, the contact pieces include a first contact piece 33 and a second contact piece 34, the contact pins include a first contact pin 23 corresponding to the first contact piece and a second contact pin 24 corresponding to the second contact piece 34, the first contact pin 23 is provided with two, the two first contact pins 23 are conducted through the first contact piece 33, the second contact pin 24 is provided with two, the two second contact pins 24 are conducted through the second contact piece 34, the distance between the first contact pin 23 and the first contact piece 33 is smaller than the distance between the second contact pin 24 and the second contact piece 34, when the device works, the first contact piece 33 is firstly contacted with the two first contact pins 23, so that the two first contact pins 23 are conducted, the device is identified through the control board MCU, and a start working signal is sent to start the device to work, when the air pressure in the lower cavity is smaller than the preset value, the second contact sheet 34 contacts with the two second contact pins 24, so that the two second contact pins 24 are conducted, the control panel MCU is used for identifying, and a work stopping signal is sent out to stop the equipment, so that the equipment can be protected to normally work within a certain load range, and the equipment is prevented from being damaged due to overhigh load.

In another embodiment, the difference from the above embodiment is that the adjusting screw 40 is provided with one, the spring set is provided with one group, the contact piece is provided with one, the contact pins are provided with two, and the two contact pins are conducted through the contact piece.

The working principle of the utility model is as follows: the lower air hole 25 is connected with a vacuum tube, when the vacuum pump works, air in the lower cavity is pumped out, the air pressure in the lower cavity is gradually reduced, the diaphragm 30 overcomes the elastic force of the lower pressure spring 21 and the air pressure in the lower cavity to deform towards the lower cavity under the action of the atmospheric pressure and the upper pressure spring 12, so that the first contact sheet 33 and the second contact sheet 34 move downwards simultaneously, the first contact sheet 33 is firstly contacted with the two first contact pins 23, and the two first contact pins 23 are conducted, and when the air pressure in the lower cavity is continuously reduced, the second contact sheet 34 is contacted with the two second contact pins 24, and the two second contact pins 24 are conducted.

In summary, 1, the upper pressure spring and the lower pressure spring are arranged on the upper side and the lower side of the diaphragm, so that the diaphragm does not need to be restored to an initial position by relying on the self resilience force of the diaphragm, the sensitivity of the air pressure switch can be improved, the situation that the resilience force of the diaphragm is weakened after long-term use is avoided, and the reliability is improved; 2. the side wall surface of the mounting hole is provided with the screw limiting rib, the outer surface of the head of the adjusting screw is provided with the screw limiting groove, the adjusting screw is prevented from rotating, meanwhile, the upper end of the upper pressure spring is pressed against the adjusting screw, so that the adjusting screw has upward pretightening force, the adjusting screw is prevented from loosening, the structure is simple and reasonable to set, and the stability is improved; 3. through setting up first contact piece and second contact piece to and first contact pin and second contact pin, the distance between first contact pin and the first contact piece is less than the distance between second contact pin and the second contact piece, and during operation, first contact piece is earlier with first contact pin contact and switch on, then the second contact piece contacts and switches on with two second contact pins, thereby can protect equipment normal work in certain load range, avoid equipment to cause the damage because of the load is too high.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, so any modifications, equivalent replacements, improvements, etc. made to the above embodiments by the technology of the present invention are all within the scope of the technical solution of the present invention.

Claims

1. The utility model provides a baroswitch, its characterized in that, includes upper cover, lower cover and spring assembly, be equipped with deformable diaphragm between upper cover and the lower cover, the edge of diaphragm all with upper cover and lower cover sealing connection, the lower surface of diaphragm is equipped with the contact piece, be equipped with the contact pilotage that corresponds with the contact piece on the lower cover, the spring assembly is including making the contact piece have the lower pressure spring who keeps away from the trend of contact pilotage direction motion all the time and making the contact piece have the last pressure spring towards the trend of contact pilotage direction motion all the time, form the epicoele between upper cover and the diaphragm, form the cavity of resorption between lower cover and the diaphragm, last pressure spring and lower pressure spring are located epicoele and cavity of resorption respectively, the surface of upper cover is equipped with the last bleeder vent with the epicoele intercommunication, go up bleeder vent and external intercommunication, the surface of lower cover is equipped with the lower bleeder vent with the, the lower air holes are connected with vacuum tubes.

2. A pneumatic switch according to claim 1, wherein the upper cover has an adjusting screw and a mounting hole for mounting the adjusting screw, the mounting hole is communicated with the upper chamber, the lower end of the adjusting screw has an upper spring groove, and two ends of the upper compression spring respectively abut against the top of the upper spring groove and the upper surface of the diaphragm.

3. The air pressure switch as claimed in claim 2, wherein the mounting hole has a threaded connection portion at a lower portion and a nail head receiving portion at an upper portion, the threaded connection portion is provided with an internal thread, the adjusting screw is screwed with the internal thread, a side wall surface of the nail head receiving portion is provided with a screw retaining rib for preventing the adjusting screw from loosening, the screw retaining rib extends along an axial direction of the mounting hole, and an outer surface of a head of the adjusting screw is provided with a screw retaining groove corresponding to the screw retaining rib.

4. A pneumatic switch as claimed in claim 3, wherein the diaphragm is provided with a positioning post corresponding to the upper spring groove, the positioning post is provided with a spring mounting groove, and the upper compression spring is mounted in the spring mounting groove.

5. A pneumatic switch as claimed in claim 1, wherein the lower surface of the diaphragm has a mushroom head protruding downward, the mushroom head includes a mushroom head body and an annular groove connected to the diaphragm, the contact piece has a contact piece through hole corresponding to the annular groove, and the contact piece is mounted on the annular groove by passing through the mushroom head body through the contact piece through hole.

6. A pneumatic switch according to claim 5, wherein the lower cover has a lower spring groove therein, the lower spring is fitted around the mushroom head, and both ends of the lower spring are respectively abutted against the lower surface of the contact piece and the bottom of the lower spring groove.

7. The pneumatic switch of claim 1, wherein the contact pins are two, the two contact pins are conducted through the contact plate, the lower cover is provided with a positioning through hole for mounting the contact pin, the contact pin is tightly fitted with the positioning through hole, one end of the contact pin close to the contact plate is provided with a head portion for preventing the contact pin from falling off, and one end of the contact pin far away from the contact plate passes through the positioning through hole and extends outwards.

8. A pneumatic switch as claimed in claim 1, wherein the upper vent hole is formed in an upper surface of the upper cover, and the lower vent hole is formed in a side wall surface of the lower cover.

9. A gas pressure switch according to claim 1, wherein said spring sets are provided in two sets, each of said two sets including an upper pressure spring and a lower pressure spring, said contact pieces including a first contact piece and a second contact piece, said contact pins including a first contact pin corresponding to the first contact piece and a second contact pin corresponding to the second contact piece.

10. The gas pressure switch of claim 9, wherein there are two first contact pins, two first contact pins are conducted through the first contact piece, two second contact pins are conducted through the second contact piece, and the distance between the first contact pin and the first contact piece is smaller than the distance between the second contact pin and the second contact piece.