CN106298361A - A kind of blast switch of vertical movement - Google Patents

Abstract

The invention discloses a wind pressure switch with vertical movement, which comprises a left shell and a right shell; an elastic diaphragm is sandwiched between the left shell and the right shell, and the elastic diaphragm divides the inside of the left shell and the right shell into negative pressure. chamber and positive pressure chamber, the negative pressure chamber is located in the right shell, and the positive pressure chamber is located in the left shell; both the left shell and the right shell are provided with air duct joints; the left shell is provided with at least two metal shrapnel, The left and right ends of the metal shrapnel are fixed on the inner wall of the left shell; both ends of the metal shrapnel are bent to have an arc-shaped concave portion; the middle of the metal shrapnel is connected to a connecting piece, and the connecting piece is connected to the middle of the elastic diaphragm; A magnet is fixed in the middle of the elastic diaphragm on the surface of the negative pressure chamber; a Hall sensor is fixed in the middle of the right shell; Back and forth vertical movement.

Description

A wind pressure switch with vertical movement

technical field

The invention relates to a wind pressure detection device, in particular to a vertically moving wind pressure switch.

Background technique

The existing air pressure mainly has two structures, one is to connect springs on both sides of the middle of the elastic diaphragm, and the spring feet are fixed in the middle of the inner wall of the air pressure switch shell. During the use of products with this structure, due to the large number of expansion and contraction, the spring’s The elasticity will gradually weaken. Since the air pressure switch is installed on the machine/equipment/wall-hung boiler, the machine/equipment/wall-hung boiler will vibrate when it is working, causing the spring to fluctuate forward, backward, left, and right or jump randomly (jitter) , resulting in unstable detection and switch data, and unstable machine movement; the other is a single steel sheet (single-leg fixed steel sheet), one end of the single steel sheet is fixed on the inner wall of the air pressure switch shell, and the other end protrudes from the air pressure switch The middle is connected with the elastic diaphragm. When the air pressure switch is working, the back and forth movement of the tail end of the steel sheet is a swinging movement (that is, the end will become a fan-shaped movement), not a vertical back and forth movement, which causes the magnetic center point to deviate, and the magnetic force is not stable. Concentration, resulting in inaccurate detection of the sensor provided in the middle of the housing.

Contents of the invention

In order to adapt to new development needs, the present invention provides a wind pressure switch with simple structure, strong practicability, magnetic force is always at the center, metal shrapnel does not vibrate and can only move vertically back and forth.

The technical scheme that the present invention solves is:

A wind pressure switch with vertical movement, comprising a left shell (1) and a right shell (2); an elastic diaphragm (3) is sandwiched between the left shell (1) and the right shell (2), and the elastic diaphragm (3) Divide the left shell (1) and the right shell (2) into a negative pressure chamber (4) and a positive pressure chamber (5), the negative pressure chamber (4) is located in the right shell (2), and the positive pressure chamber ( 5) It is located in the left shell (1); both the left shell (1) and the left shell (2) are provided with air pipe joints (6); the left shell (1) is provided with at least two metal shrapnel ( 11), the left and right ends of the metal shrapnel (11) are fixed on the inner wall of the left shell (1); both ends of the metal shrapnel (11) are bent with an arc-shaped concave portion (110); the metal shrapnel (11) ) is connected to a connector (12) in the middle, and the connector (12) is connected to the middle of the elastic diaphragm (3); a magnet (7) is fixed in the middle of the elastic diaphragm (3) on the negative pressure chamber (4) surface ; The Hall sensor (8) is fixed in the middle of the right shell (1).

Further: the left shell (1) is provided with a three-legged metal shrapnel (11), the three end legs of the metal shrapnel (11) are fixed on the inner wall of the left shell (1), and the sheet body of each end leg section is bent with an arc shaped lower recess (110).

Further: a Hall sensor (8) is fixed outside and in the middle of the right shell (1).

The advantages of the present invention are: when the wind pressure switch works, the air in the negative pressure chamber is sucked, the negative pressure in the negative pressure chamber increases, the center point of the metal shrapnel and the magnet approach the Hall sensor, and the opening of the arc-shaped concave part will be closed due to Stretch and expand by moving to one side, and the opening becomes larger, so that the center point of the metal shrapnel can approach the Hall sensor, and the electrical contact of the Hall sensor that reaches the set magnetic value is closed, thereby turning on the power supply. When the negative pressure chamber pressure When it decreases, the metal shrapnel becomes smaller through the elastic contraction force of the opening of the arc-shaped lower concave part, thereby driving the magnet to reset in the center and away from the Hall sensor. When the magnetic force value is lower than the set value, the electrical contact of the Hall sensor springs off , so as to cut off the power supply; all the end feet of the metal shrapnel are fixed on the left shell and cannot move. The stretching of the opening of the lower recess makes the center point move forward, which forms a straight line motion, that is, vertical motion; this product uses a three-legged metal shrapnel fixedly connected to the left shell wall, using the stability of the triangular stability principle, so that When the machine/equipment/wall-hung boiler vibrates during operation, it will not fluctuate forward, backward, left and right or jump randomly (jitter), the magnetic force transmission is accurate and stable, and the performance is excellent.

Description of drawings

Fig. 1 is the sectional view of product air pressure switch of the present invention;

Fig. 2 is the front view of product metal shrapnel of the present invention;

Fig. 3 is a schematic diagram of the negative pressure cavity of the wind pressure switch of the present invention after the metal shrapnel is stretched and expanded toward the side near the Hall sensor after the negative pressure chamber of the air pressure switch of the product is stretched and expanded;

Fig. 4 is the top view of the two-legged metal shrapnel of the product of the present invention;

Fig. 5 is a top view of the tripod metal shrapnel of the product of the present invention.

detailed description

A wind pressure switch with vertical movement, comprising a left shell 1 and a right shell 2; an elastic diaphragm 3 is sandwiched between the left shell 1 and the right shell 2, and the elastic diaphragm 3 holds the left shell 1 and the right shell 2 inside Divided into a negative pressure chamber 4 and a positive pressure chamber 5, the negative pressure chamber 4 is located in the right shell 1, and the positive pressure chamber 5 is located in the left shell 2; the left shell 1 and the right shell 2 are equipped with air pipe joints 6; There are metal shrapnel 11 with at least two legs inside the left shell 1, and the left and right ends of the metal shrapnel 11 are fixed on the inner wall of the left shell 1; both ends of the metal shrapnel 11 are curved with an arc-shaped concave portion 110; A connector 12 is connected to the middle of the metal shrapnel 11, and the connector 12 is connected to the middle of the elastic diaphragm 3; a magnet 7 is fixed in the middle of the elastic diaphragm 3 on the surface of the negative pressure chamber 4; Hall sensor8.

The left shell 1 is provided with a three-legged metal shrapnel 11, and the three end legs of the metal shrapnel 11 are fixed on the inner wall of the left shell 1, and the sheet body of each end leg section is curved with an arc-shaped concave portion 110.

A Hall sensor 8 is fixed in the middle of the outside of the right shell 1 .

work process:

When the wind pressure switch works, the air in the negative pressure chamber 4 is sucked, the negative pressure of the negative pressure chamber 4 increases, the center point of the metal shrapnel 11 and the magnet 7 approach the Hall sensor 8, and the opening of the arc-shaped concave portion 110 will be closed due to Stretch and expand by moving to one side, and the opening becomes larger, so that the center point of the metal shrapnel 11 can approach the Hall sensor 8, and the electrical contact of the Hall sensor 8 that reaches the set magnetic force value is closed, thereby turning on the power supply. When the pressure of the pressure chamber 4 decreases, the elastic contraction force of the metal shrapnel 11 becomes smaller through the opening of the arc-shaped concave portion 110, thereby driving the magnet 7 to return to the center and away from the Hall sensor 8. When the magnetic force value is lower than the set value, the Hall sensor The electrical contacts of the Hall sensor 8 bounce off, thereby cutting off the power supply; all the end feet of the metal shrapnel 11 are fixed on the left shell 1 and cannot move. 8. During the approaching movement, the central point can only move forward through the stretching of the opening of each arc-shaped concave part 110, which forms a straight line movement, that is, vertical movement; It is fixed on the inner wall of the left shell 1, using the stability of the triangular fixing principle, so that when the machine/equipment/wall-hung boiler vibrates during operation, it will not fluctuate forward, backward, left, right or randomly jump (jitter), and the magnetic force transmission is accurate and Stablize.

Claims (3)

1. a blast switch for vertical movement, including left housing (1) and right shell (2)；Press from both sides between described left housing (1) and right shell (2) Equipped with flexible sheet (3), flexible sheet (3) is divided into negative pressure cavity (4) and malleation chamber (5) by internal to left housing (1) and right shell (2), negative Pressure chamber (4) is in right shell (2) portion, and malleation chamber (5) are in left housing (1) portion；Described left housing (1) and left housing (2) are equipped with airduct and connect Head (6)；It is characterized in that: in described left housing (1), be provided with the metal clips (11) of at least bipod, the left and right two of metal clips (11) End foot is fixed on left housing (1) inwall；Described metal clips (11) two ends section has all bent an arc lower concave part (110)；Described Connecting in the middle of metal clips (11) and have a connection piece (12), connector (12) is connected with in the middle of flexible sheet (3)；Described negative It is fixed with a Magnet (7) in the middle of the flexible sheet (3) in pressure chamber (4) face；It is fixed with Hall element in the middle of described right shell (1) (8)。

The blast switch of a kind of vertical movement the most according to claim 1, it is characterised in that: described left housing is provided with in (1) The metal clips (11) of three feet, three end feet of metal clips (11) are fixed on left housing (1) inwall, and often the sheet of end foot section is equal Bending has an arc lower concave part

(110)。

The blast switch of a kind of vertical movement the most according to claim 1, it is characterised in that: described right shell (1) outside Centre is fixed with Hall element (8).