CN210837594U

CN210837594U - Pressure switch

Info

Publication number: CN210837594U
Application number: CN201921704257.XU
Authority: CN
Inventors: 张百灵; 方燕
Original assignee: Jiangsu Decon Valve Manufacturing Co ltd
Current assignee: Jiangsu Decon Valve Manufacturing Co ltd
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2020-06-23
Anticipated expiration: 2029-10-12

Abstract

The utility model discloses a pressure switch relates to switching device technical field, has solved current pressure switch and has changed comparatively trouble problem. The device comprises an upper shell and a lower shell, wherein the upper shell is detachably connected with the lower shell, an elastic diaphragm which divides the lower shell into an upper cavity and a lower cavity is connected in the lower shell, and the middle part of the elastic diaphragm is sunken downwards; the lower end of the lower shell is communicated with the pressure joint, and fluid enters the lower shell from the pressure joint; the upper shell or the lower shell is internally connected with a push rod which slides up and down, and the lower end of the push rod is abutted against the upper side of the elastic membrane; the upper shell is internally provided with a movable contact and a fixed contact which extend upwards to extend out of the upper shell, and when the elastic film pushes the ejector rod upwards to move, the ejector rod drives the movable contact to upwards contact or leave the fixed contact. When parts on the upper side of the elastic membrane such as an internal contact or an L-shaped elastic sheet need to be replaced, the pressure switch can be directly detached by oneself, and the replacement and the use are convenient.

Description

Pressure switch

Technical Field

The utility model relates to a switching device technical field, in particular to pressure switch.

Background

The pressure switch is widely used for measuring and controlling the gauge pressure and absolute pressure of various gases and liquids in the fields of petroleum, chemical industry, metallurgy, electric power, water supply and the like, and is an ideal intelligent measuring and controlling instrument for industrial fields. When the pressure is increased, the sensing pressure components (the diaphragm, the corrugated pipe and the piston) acting on different parts deform and move upwards, and finally the microswitch at the uppermost end is started through mechanical structures such as a railing spring and the like, so that an electric signal is output. However, the replacement of the existing pressure switches is troublesome, since the operating device must be first turned off and the internal fluid must be first drained when necessary.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a pressure switch, it can directly dismantle pressure switch, is convenient for change the use when the spare part of elastic diaphragm upside such as inside contact or L type flexure strip needs to be changed.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a pressure switch comprises an upper shell and a lower shell, wherein the upper shell is detachably connected with the lower shell, an elastic diaphragm which divides the lower shell into an upper cavity and a lower cavity is connected in the lower shell, and the middle part of the elastic diaphragm is downwards sunken; the lower end of the lower shell is communicated with the pressure joint, and fluid enters the lower shell from the pressure joint; the upper shell or the lower shell is internally connected with a push rod which slides up and down, and the lower end of the push rod is abutted against the upper side of the elastic membrane; the upper shell is internally provided with a movable contact and a fixed contact which extend upwards to extend out of the upper shell, and when the elastic film pushes the ejector rod upwards to move, the ejector rod drives the movable contact to upwards contact or leave the fixed contact.

Furthermore, the movable contact is fixed on the L-shaped elastic piece, the L-shaped elastic piece comprises a connecting edge and a bending edge, the connecting edge of the L-shaped elastic piece is connected with the contact piece, and the bending edge is fixed with the movable contact and is abutted against the upper end of the ejector rod.

Furthermore, the movable contact is located under the fixed contact, the upper shell is internally connected with a butting rod, the lower end of the butting rod is located over the ejector rod, and when the movable contact is butted with the fixed contact, the lower end of the butting rod is butted against the upper side of the bending edge.

Further, the abutment lever includes a cushion rubber block at a lower end thereof.

Furthermore, the pressure joint comprises a channel which is communicated up and down, and the cross section of the channel is gradually reduced from bottom to top and then gradually increased.

Furthermore, the lower shell is internally connected with an upper partition plate and a lower partition plate which are respectively positioned at the upper side and the lower side of the elastic diaphragm, the upper partition plate is horizontally arranged, the lower partition plate is sunken downwards, and the lower partition plate is fixed with the upper end of the pressure joint.

Furthermore, a circle of fixing ring extends from the upper end part of the lower shell to the axis of the lower shell, the fixing ring is abutted against the upper partition plate, and the lower partition plate is fixed with the lower shell.

To sum up, the utility model discloses following beneficial effect has:

divide into casing and lower casing with whole casing, when the part in the upper casing need be changed, can go up the casing separation and change, because elastic film still keeps off and locates on fluidic flow direction, can not make inside fluid spill over, the change of the part of being convenient for is used.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure, 1, an upper shell; 11. a movable contact; 12. a stationary contact; 13. a contact piece; 14. an L-shaped elastic sheet; 15. a butting rod; 2. a lower housing; 21. a top rod; 22. an upper partition plate; 23. a lower partition plate; 24. a fixing ring; 3. an elastic diaphragm; 4. and a pressure joint.

Detailed Description

The following description will be further described with reference to the accompanying drawings, which are not intended to limit the present invention.

A pressure switch, as shown in fig. 1, comprises an upper shell 1 and a lower shell 2, wherein the upper shell 1 is detachably connected with the lower shell 2, in this embodiment, the upper shell 1 is screwed outside the upper end of the lower shell 2; the lower shell 2 is internally connected with an elastic diaphragm 3 which divides the lower shell into an upper cavity and a lower cavity, and the middle part of the elastic diaphragm 3 is sunken downwards; the lower end of the lower shell 2 is communicated with a pressure joint 4, and fluid enters the lower shell 2 from the pressure joint 4 and transmits the fluid pressure to the elastic diaphragm 3.

An upper partition plate 22 and a lower partition plate 23 which are respectively positioned at the upper side and the lower side of the elastic diaphragm 3 are connected in the lower shell 2, the upper partition plate 22 is horizontally arranged, the lower partition plate 23 is sunken downwards, and the lower partition plate 23 is fixed with the upper end of the pressure joint 4. The upper end of the lower shell 2 extends to the axle center thereof with a circle of fixing ring 24, the fixing ring 24 is abutted against the upper partition plate 22, the lower partition plate 23 is fixed with the lower shell 2, and fluid enters a cavity enclosed by the lower partition plate 23 and the elastic diaphragm 3 through the pressure joint 4. In this embodiment, the lower partition 23 is fixed to the fixing ring 24 by a plurality of vertical screws.

A push rod 21 which slides up and down is connected in the upper shell 1 or the lower shell 2, in the embodiment, the push rod 21 is inserted in the fixing ring 24 and slides up and down along an inner hole of the fixing ring 24, and the lower end of the push rod 21 abuts against the upper side of the elastic membrane 3; the upper shell 1 is also connected with a movable contact 11 and a fixed contact 12, the movable contact 11 and the fixed contact 12 are both extended upwards to form a contact piece 13 extending out of the upper shell 1, when the fluid pressure exceeds a certain value, the elastic film is driven to push the ejector rod 21 upwards to move upwards, and the ejector rod 21 drives the movable contact 11 to contact upwards or leave the fixed contact 12.

The movable contact 11 is fixed on the L-shaped elastic sheet 14, the L-shaped elastic sheet 14 is an elastic steel sheet and comprises a connecting edge and a bending edge, an acute angle is formed between the connecting edge and the bending edge, in the embodiment, the acute angle is 80 degrees, the connecting edge of the L-shaped elastic sheet 14 is vertically arranged, and the bending edge is fixed with the movable contact 11 and is abutted against the upper end of the ejector rod 21; a horizontal plate is fixed in the upper shell 1, the contact plate 13 is positioned above the horizontal plate, a conducting rod penetrating through the horizontal plate is bonded on the contact plate 13, and the static contact 12 and the L-shaped elastic piece 14 are fixed at the lower end of the corresponding conducting rod.

In this embodiment, the switch is a normally open switch, so the moving contact 11 is located right below the stationary contact 12, and when the pressure is increased to a certain degree, the push rod 21 drives the moving contact 11 to contact the stationary contact 12 upward. In order to reduce the impact strength of the movable contact 11 on the fixed contact 12 in the case of instantaneous pressure increase or high pressure, a vertical abutting rod 15 is fixed below a horizontal plate in the upper shell 1, the lower end of the abutting rod 15 is positioned right above the ejector rod 21, and when the movable contact 11 abuts against the fixed contact 12, the lower end of the abutting rod 15 abuts against the upper side of the bending edge of the L-shaped elastic sheet 14. The abutting rod 15 comprises a buffer rubber block at the lower end thereof to further buffer the bent edge and prolong the service life of the L-shaped elastic piece 14, the movable contact 11 and the fixed contact 12.

In order to improve the sensitivity of the device to pressure, the pressure joint 4 comprises a channel which is communicated up and down, the cross section of the channel is gradually decreased from bottom to top and then gradually increased, pressure is gathered firstly and then the pressure is uniformly dispersed on the elastic membrane 3, and the channel is a vertical channel in the embodiment.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications or equivalent substitutions within the spirit and scope of the present invention, and such modifications or equivalent substitutions should also be considered as falling within the scope of the present invention.

Claims

1. A pressure switch, characterized by: the device comprises an upper shell (1) and a lower shell (2), wherein the upper shell (1) and the lower shell (2) are detachably connected, an elastic diaphragm (3) which divides the lower shell (2) into an upper cavity and a lower cavity is connected in the lower shell, and the middle part of the elastic diaphragm (3) is sunken downwards; the lower end of the lower shell (2) is communicated with the pressure joint (4), and fluid enters the lower shell (2) from the pressure joint (4); a push rod (21) which slides up and down is connected in the upper shell (1) or the lower shell (2), and the lower end of the push rod (21) is abutted against the upper side of the elastic membrane (3); the upper shell (1) is also internally connected with a movable contact (11) and a fixed contact (12), the movable contact (11) and the fixed contact (12) both extend upwards to form a contact piece (13) extending out of the upper shell (1), and when the elastic film upwards pushes the ejector rod (21) to move upwards, the ejector rod (21) drives the movable contact (11) to upwards contact or leave the fixed contact (12).

2. A pressure switch according to claim 1, wherein: the movable contact (11) is fixed on the L-shaped elastic sheet (14), the L-shaped elastic sheet (14) comprises a connecting edge and a bending edge, the connecting edge of the L-shaped elastic sheet (14) is connected with the contact sheet (13), and the bending edge is fixed with the movable contact (11) and is abutted against the upper end of the ejector rod (21).

3. A pressure switch according to claim 2, wherein: the movable contact (11) is located under the fixed contact (12), the upper shell (1) is internally connected with a butt-joint rod (15), the lower end of the butt-joint rod (15) is located over the ejector rod (21), and when the movable contact (11) is in butt joint with the fixed contact (12), the lower end of the butt-joint rod (15) is in butt joint with the upper side of the bent edge.

4. A pressure switch according to claim 3, wherein: the abutting rod (15) comprises a buffer rubber block at the lower end thereof.

5. A pressure switch according to claim 1 or 3, characterized in that: the pressure joint (4) comprises a channel which is communicated up and down, and the cross section of the channel is gradually decreased from bottom to top and then gradually increased.

6. A pressure switch according to claim 1, wherein: an upper partition plate (22) and a lower partition plate (23) which are respectively positioned at the upper side and the lower side of the elastic diaphragm (3) are connected in the lower shell (2), the upper partition plate (22) is horizontally arranged, the lower partition plate (23) is sunken downwards, and the lower partition plate (23) is fixed with the upper end of the pressure joint (4).

7. A pressure switch according to claim 6, wherein: the upper end of the lower shell (2) extends to the axis of the lower shell to form a circle of fixing ring (24), the fixing ring (24) is abutted to the upper partition plate (22), and the lower partition plate (23) is fixed with the lower shell (2).