A switch device and automatic pressure switch thereof

Abstract

The invention discloses a switch device, comprising a bracket, a switch body and a shift fork, wherein the switch body is arranged on the bracket, a static contact and a moving contact arranged on a moving contact piece are arranged in the switch body, and the shift fork passes through the switch body, and when the shift fork moves up and down, it drives the moving contact piece to flip, thereby making the moving contact piece contact or disengage with the static contact, and the switch device is provided with a moving contact piece flipping force adjustment mechanism, which has the advantages of fundamentally solving the problems of non-adjustable pressure differential (the difference between a starting value and a stopping value) and contradiction between the starting value, the stopping value and the pressure differential in various types of existing pressure switches during production and use, the starting value, the stopping value and the pressure differential can be adjusted independently, and the structure is simple and practical, the method is simple and easy to implement, which greatly reduces product scrapping and avoids major accidents of burning motors, and lays a solid foundation for product upgrading; and significantly improves the technical performance, control accuracy, use performance, service life and economic benefits of existing products.

Description

Technical Field

[0001] The invention relates to the field of electrical appliances and automatic control, and in particular to a switch device and an automatic pressure switch used for pressure detection and control of various liquids and gases. Background Art

[0002] Various existing pressure switches have a common shortcoming during production and use, that is, when setting the pressure start value, stop value and pressure difference (the difference between the start value and the stop value), due to the limitations of its structure, the pressure difference is basically an unadjustable fixed value, so the start value, stop value and pressure difference are inconsistent and cannot be adjusted independently. This will cause a common fatal defect in existing products. When the pressure difference changes during manufacturing and use, it will cause a large number of products to be scrapped, and even cause a major accident of burning the motor. Summary of the invention

[0003] A technical problem to be solved by the present invention is to provide a switch device capable of adjusting the difference between a start value and a stop value and an automatic pressure switch using the switch device.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a switch device, including a bracket, a switch body and a shift fork, the switch body is arranged on the bracket, a static contact and a moving contact arranged on a moving contact piece are arranged in the switch body, the shift fork passes through the switch body, when the shift fork moves up and down, it drives the moving contact piece to flip, and then the moving contact is in contact with or separated from the static contact, and the switch device is provided with a moving contact piece flipping force adjustment mechanism.

[0005] The bracket includes an upper support plate and a lower support plate, a through hole is provided on the shift fork, the moving contact piece passes through the through hole, the upper end of the through hole is provided with a start-shifting protrusion facing the upper surface of the moving contact piece, and the lower end of the through hole is provided with a stop-shifting protrusion facing the lower surface of the moving contact piece. The switch body is provided between the upper support plate and the lower support plate and can move up and down between the upper support plate and the lower support plate. The first type of moving contact piece flipping force adjustment mechanism includes a support spring and a stop bolt, the two ends of the support spring are respectively abutted against the lower end surface of the switch body and the lower support plate, the stop bolt is screwed on the upper support plate, and the lower end surface of the stop bolt is abutted against the upper end surface of the switch body.

[0006] A cavity is arranged in the stop bolt, and the upper end of the shift fork is inserted into the cavity and can move up and down in the cavity.

[0007] The movable contact piece is provided with a mounting hole, and the movable contact piece is fixed on the switch body by a mounting pin passing through the mounting hole.

[0008] The cross-sectional shape of the movable contact piece after being assembled in the switch is arc-shaped or wavy-shaped.

[0009] The second type of moving contact piece flipping force adjustment mechanism further includes a starting bolt based on the first type of moving contact piece flipping force adjustment mechanism. The shift fork is provided with a screw hole that passes through the upper end of the shift fork to the through hole. The starting bolt passes through the upper end of the stop bolt and the screw hole in sequence and is screwed with the shift fork through the screw hole. The front end of the starting bolt extends into the through hole, and the closed shifting protrusion is provided at the front end of the starting bolt.

[0010] The bracket includes an upper support plate and a lower support plate, the shift fork is provided with a through hole, the moving contact piece passes through the through hole, and the lower end of the through hole is provided with a stop-moving protrusion facing the lower surface of the moving contact piece. The third type of moving contact piece flipping force adjustment mechanism includes a starting bolt, the shift fork is provided with a screw hole passing through the upper end of the shift fork to the through hole, the starting bolt passes through the screw hole and is threadedly connected to the shift fork, the front end of the starting bolt extends into the through hole, and the front end of the starting bolt constitutes a starting-moving protrusion facing the upper surface of the moving contact piece.

[0011] The method for adjusting the flipping force of the moving contact piece using the first moving contact piece flipping force adjustment mechanism is as follows: when the switch is in a closed state, the stop bolt is rotated, and the lower end surface of the stop bolt that is connected to the upper end surface of the switch body pushes the switch body to move. At this time, the shift fork moves upward relatively. A cavity is provided in the stop bolt. The upper end of the shift fork is inserted into the cavity and can move up and down in the cavity. The stop shifting protrusion at the lower end of the through hole pushes the center of the moving contact piece to move upward, thereby adjusting the stop flipping force.

[0012] The method for adjusting the flipping force of the moving contact piece using the second moving contact piece flipping force adjustment mechanism is as follows: when the switch is in a closed state, the stop bolt is rotated, and the lower end surface of the stop bolt connected to the upper end surface of the switch body pushes the switch body to move. At this time, the shift fork moves upward relatively, and a cavity is provided in the stop bolt. The upper end of the shift fork is inserted into the cavity and can move up and down in the cavity. The stop shifting convex point at the lower end of the through hole pushes the center of the moving contact piece to move upward, thereby adjusting the stop flipping force; and when the switch is in a disconnected state, the start bolt is rotated, and the start shifting convex point at the front end of the start bolt will move downward, thereby adjusting the start flipping force.

[0013] The method for adjusting the flipping force of the moving contact piece using the third moving contact piece flipping force adjustment mechanism is as follows: when the switch is in the off state, the starting bolt is rotated, and the starting toggle protrusion at the front end of the starting bolt will move downward to adjust the starting flipping force.

[0014] A switching device of an automatic pressure switch comprises a bracket, a switch body and a shift fork, wherein the switch body is arranged on the bracket, a static contact and a moving contact arranged on a moving contact piece are arranged in the switch body, the shift fork passes through the switch body, and when the shift fork moves up and down, it drives the moving contact piece to flip, thereby making the moving contact contact or disengage from the static contact, and the switch device is provided with a moving contact piece flipping force adjustment mechanism; a base, an elastic sealing pad and a pressure spring are arranged below the bracket, the base is connected to the bracket, and the outer periphery of the elastic sealing pad is pressed and fixed on the base, the bottom of the shift fork is against the elastic sealing pad, the bottom of the shift fork is provided with a protrusion, the pressure spring is sleeved on the shift fork, and the two ends of the pressure spring are respectively abutted on the bracket and the protrusion.

[0015] Compared with the prior art, the advantage of the present invention is that it fundamentally solves the problem that the pressure differential (the difference between the starting value and the stopping value) of various existing pressure switches cannot be adjusted during production and use, and the starting value, stopping value and pressure differential are inconsistent. The starting value, stopping value and pressure differential can be adjusted independently, and the structure is simple and practical, the method is simple and easy to implement, which greatly reduces product scrapping and avoids major accidents such as motor burning, laying a solid foundation for product upgrading; greatly enhances the environmental adaptability of existing products, and significantly improves the technical performance, control accuracy, performance, service life and economic benefits of existing products. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the closed state of the switch device according to the first embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the disconnected state of the switch device according to the first embodiment of the present invention;

[0018] Figure 3 The figures are cross-sectional views of two types of movable contact pieces 9 in the switch device of the present invention, wherein (a) is a movable contact piece with an arc-shaped cross-sectional shape, (b) is a development view of (a) before installation, (c) is a movable contact piece with a wavy cross-sectional shape, and (d) is a development view of (c) before installation;

[0019] Figure 4 This is a schematic diagram of the closed state of the switch device according to the second embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the disconnected state of the switch device according to the second embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the closed state of the automatic pressure switch according to the third embodiment of the present invention;

[0022] Figure 7This is a schematic diagram of the disconnected state of the automatic pressure switch according to the third embodiment of the present invention;

[0023] Figure 8 This is a schematic diagram of the closed state of the automatic pressure switch according to the fourth embodiment of the present invention;

[0024] Fig. 9 It is a schematic diagram of the disconnected state of the automatic pressure switch of the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings.

[0026] Embodiment 1: Figure 1 and Figure 2 As shown, a switch device includes a bracket 4, a switch body 7 and a shift fork 5, the bracket 4 includes an upper support plate 41 and a lower support plate 42, the switch body 7 is arranged between the upper support plate 41 and the lower support plate 42 and can move up and down between the upper support plate 41 and the lower support plate 42, the switch body 7 is provided with a static contact 6 and a moving contact 91 arranged on a moving contact piece 9, the cross-sectional shape of the moving contact piece 9 is an arc, the shift fork 5 is provided with a through hole 51, the through hole 51 is rectangular or waist-shaped, and the moving contact piece 9 is provided with a through hole 51. A mounting hole 92 is provided, and the moving contact piece 9 passes through the through hole 51. The moving contact piece 9 is fixed to the switch body 7 by a mounting pin 93 passing through the mounting hole 92. A start-shifting convex point 52 facing the upper surface of the moving contact piece 9 is provided at the upper end of the through hole 51, and a stop-shifting convex point 53 facing the lower surface of the moving contact piece 9 is provided at the lower end of the through hole 51. The shift fork 5 passes through the switch body 7. When the shift fork 5 moves up and down, it drives the moving contact piece 9 to flip, thereby making the moving contact 91 contact or disconnect with the static contact 6. A stop bolt 3 is screwed onto the upper support plate 41, and the lower end surface of the stop bolt 3 is abutted against the upper end surface of the switch body 7. A cavity 31 is provided in the stop bolt 3. The upper end of the shift fork 5 is inserted into the cavity 31 and can move up and down in the cavity 31. A support spring 13 is provided between the lower end surface of the switch body 7 and the lower support plate 42, and the two ends of the support spring 13 are respectively abutted against the lower end surface of the switch body 7 and the lower support plate 42, thereby constituting a moving contact piece flipping force adjustment mechanism. When the switch is in a closed state, the stop bolt 3 is rotated, and the lower end surface of the stop bolt 3 which is connected to the upper end surface of the switch body 7 pushes the switch body 7 to move downward. At this time, the shift fork 5 moves upward relatively. A cavity 31 is provided in the stop bolt 3. The upper end of the shift fork 5 is inserted into the cavity 31 and can move up and down in the cavity 31. The stop shifting protrusion 53 at the lower end of the through hole 51 pushes the center of the moving contact piece 9 to move upward, and the stop flipping force is adjusted until the adjustment is completed close to the flipping critical point. At this time, only a small upward pushing force needs to be applied to the shift fork 5 to flip the moving contact piece 9, so that the moving contact 91 is disconnected from the static contact 6, thereby achieving the purpose of disconnecting the circuit.

[0027] Embodiment 2: Figure 4 and Figure 5As shown, a switch device, the other structures of which are the same as those of the first embodiment, is different in that the moving contact piece flipping force adjustment mechanism also includes a starting bolt 2, and a screw hole 54 is provided on the fork 5, which passes through the upper end of the fork to the through hole 51. The starting bolt 2 passes through the upper end of the stop bolt 3 and the screw hole 54 in sequence and is screwed to the fork 5 through the screw hole 54. The front end of the starting bolt 2 extends into the through hole 51. At this time, the front end of the starting bolt 2 constitutes a starting toggle protrusion 52. As in the first embodiment, when the switch is in the closed state, the stop bolt 3 is rotated, and the lower end surface of the stop bolt 3 which is connected to the upper end surface of the switch body 7 pushes the switch body 7 to move downward. At this time, the shift fork 5 moves upward relatively. A cavity 31 is provided in the stop bolt 3. The upper end of the shift fork 5 is inserted into the cavity 31 and can move up and down in the cavity 31. The stop shifting protrusion 53 at the lower end of the through hole 51 pushes the center of the moving contact piece 9 to move upward, and the stop flipping force is adjusted until it approaches the flipping critical point. At this time, only a small upward pushing force needs to be applied to the shift fork 5 to flip the moving contact piece 9, so that the moving contact 91 is disconnected from the static contact 6, thereby achieving the purpose of disconnecting the circuit. When the switch is in the off state, the starting bolt 2 is rotated, and the starting toggle protrusion 52 at the front end of the starting bolt 2 will move downward, pushing the center of the moving contact piece 9 to move downward, and adjusting the starting flipping force until it approaches the flipping critical point. At this time, only a small downward pushing force needs to be applied to the fork 5 to flip the moving contact piece 9, so that the moving contact 91 contacts the static contact 6, thereby achieving the purpose of closing the circuit.

[0028] As an example of the switch device of the above two embodiments, the switch device can be used as a common switch. When used as a common switch, it is sufficient to connect the lower part of the fork 5 to the switch button structure. Now, an example is given to illustrate the working principle of the switch device at this time:

[0029] The lower part of the shift fork 5 is connected to the button structure. When the circuit is closed, the button is pressed to push the shift fork 5 upward, forcing the moving contact spring 9 to flip upward, the switch device is disconnected, and the circuit is disconnected; when the circuit is disconnected, the button is pressed again to pull the shift fork 5 downward, forcing the moving contact spring 9 to flip downward, the switch device is closed, and the circuit is started.

[0030] Embodiment 3: Figure 6 and Figure 7 As shown, an automatic pressure switch uses the switch device of Example 1. A base 10, an elastic sealing pad 11 and a pressure spring 12 are arranged below the bracket 4. The bracket 4 includes an upper support plate 41 and a lower support plate 42. The base 10 is connected to the lower support plate 42, and the outer periphery of the elastic sealing pad 11 is pressed and fixed on the base 10. The bottom of the fork 5 abuts against the elastic sealing pad 11. A protrusion 55 is arranged at the bottom of the fork 5. The pressure spring 12 is sleeved on the fork 5, and the two ends of the pressure spring 12 abut against the lower support plate 42 and the protrusion 55 respectively.

[0031] Embodiment 4: Figure 8 and Fig. 9 As shown, an automatic pressure switch uses the switch device of embodiment 2, a base 10, an elastic sealing pad 11 and a pressure spring 12 are arranged below the bracket 4, the bracket 4 includes an upper support plate 41 and a lower support plate 42, the base 10 is connected to the lower support plate 42, and the outer periphery of the elastic sealing pad 11 is pressed and fixed on the base 10, the bottom of the fork 5 is against the elastic sealing pad 11, and a protrusion 55 is arranged at the bottom of the fork 5, the pressure spring 12 is sleeved on the fork 5, and the two ends of the pressure spring 12 are respectively abutted on the lower support plate 42 and the protrusion 55.

Claims

1. A switch device, comprising a bracket, a switch body and a shift fork, wherein the switch body is arranged on the bracket, a static contact and a movable contact arranged on a movable contact piece are arranged in the switch body, and the shift fork passes through the switch body. When the shift fork moves up and down, it drives the movable contact piece to flip, thereby making the movable contact contact or disengage with the static contact, characterized in that: The switch device is provided with a moving contact piece turning force adjustment mechanism; The bracket comprises an upper support plate and a lower support plate, the shift fork is provided with a through hole, the moving contact piece passes through the through hole, the upper end of the through hole is provided with a start-shifting convex point facing the upper surface of the moving contact piece, the lower end of the through hole is provided with a stop-shifting convex point facing the lower surface of the moving contact piece, the switch body is provided between the upper support plate and the lower support plate and can move up and down between the upper support plate and the lower support plate, the moving contact piece turning force adjustment mechanism comprises a support spring and a stop bolt, the two ends of the support spring are respectively abutted against the lower end surface of the switch body and the lower support plate, the stop bolt is screwed on the upper support plate, and the lower end surface of the stop bolt is abutted against the upper end surface of the switch body; The movable contact piece flipping force adjustment mechanism also includes a starting bolt, the shift fork is provided with a screw hole penetrating the upper end of the shift fork to the through hole, the starting bolt sequentially passes through the upper end of the stop bolt and the screw hole and is screwed with the shift fork through the screw hole, the front end of the starting bolt extends into the through hole, and the starting shifting convex point is provided at the front end of the starting bolt; A cavity is arranged inside the stop bolt, and the upper end of the shift fork is inserted into the cavity and can move up and down in the cavity.

2. A switch device according to claim 1, characterized in that: The movable contact piece is provided with a mounting hole, and the movable contact piece is fixed on the switch body by a mounting pin passing through the mounting hole.

3. A switch device according to claim 1, characterized in that: The cross-sectional shape of the movable contact piece after being assembled in the switch is arc-shaped or wavy-shaped.

4. A switch device according to claim 1, characterized in that: The bracket includes an upper support plate and a lower support plate, the shift fork is provided with a through hole, the moving contact piece passes through the through hole, the lower end of the through hole is provided with a stop-moving protrusion facing the lower surface of the moving contact piece, the moving contact piece flipping force adjustment mechanism includes a starting bolt, the shift fork is provided with a screw hole passing through the upper end of the shift fork to the through hole, the starting bolt passes through the screw hole and is threadedly connected to the shift fork, the front end of the starting bolt extends into the through hole, and the front end of the starting bolt constitutes a starting-moving protrusion facing the upper surface of the moving contact piece.

5. A method for adjusting the flipping force of a movable contact piece using the switch device according to claim 1, characterized in that: When the switch is in a closed state, the stop bolt is rotated, and the lower end surface of the stop bolt connected to the upper end surface of the switch body pushes the switch body downward. At this time, the shift fork moves upward relatively. A cavity is provided in the stop bolt. The upper end of the shift fork is inserted into the cavity and can move up and down in the cavity. The stop shifting convex point at the lower end of the through hole pushes the center of the moving contact piece upward to adjust the stop flipping force.

6. A method for adjusting the turning force of a movable contact piece using the switch device as claimed in claim 1 or 4, characterized in that: When the switch is in the off state, rotate the starting bolt, and the starting toggle convex point at the front end of the starting bolt will move downward to adjust the starting flip force.

7. An automatic pressure switch using the switch device as claimed in any one of claims 1 to 4, characterized in that: The bracket includes an upper support plate and a lower support plate, and a base, an elastic sealing pad and a pressure spring are arranged below the bracket. The base is connected to the lower support plate, and the outer periphery of the elastic sealing pad is pressed and fixed on the base. The bottom of the fork is against the elastic sealing pad, and a protrusion is arranged at the bottom of the fork. The pressure spring is sleeved on the fork, and the two ends of the pressure spring are respectively abutted on the lower support plate and the protrusion.

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