CN216240827U - Motion detection device for steam extraction check valve - Google Patents

Abstract

A motion detection device for a steam extraction check valve. The motion control of the steam extraction check valve is realized by a travel switch, when a collision block presses down a mandril of the travel switch to drive a switch contact to act to form on and off of a control loop, the corresponding speed is low, and the contact is easy to oxidize and has poor contact, thereby causing the phenomena of misoperation and operation rejection. The utility model comprises the following components: the steam extraction device comprises a steam extraction check valve (1), a motion connecting rod (2) and a casing (3), wherein an encircling frame (4) is fixed on the motion connecting rod, the casing is fixed with a fixed plate (5) at the bottom of a dust-proof box (8) through a bolt, a proximity switch (6) is fixed in the dust-proof box, the bottom of the dust-proof box is communicated with an air pipe (9), and the air pipe is communicated with an air pump (10); the dustproof box is a hollow box body, an opening (11) is formed in one side face of the dustproof box, and the detection end of the proximity switch is opposite to the opening. The utility model is used for detecting the motion of the steam extraction check valve.

Description

Motion detection device for steam extraction check valve

Technical Field

The utility model relates to a motion detection device for a steam extraction check valve.

Background

The steam extraction check valve is an important part in the work of a steam turbine, and can prevent steam from flowing backwards to cause steam runaway of the steam turbine when the steam turbine stops in an accident.

Disclosure of Invention

The utility model aims to provide a motion detection device for a steam extraction check valve.

The above purpose is realized by the following technical scheme:

a steam extraction check valve motion detection device comprises a steam extraction check valve, a motion connecting rod and a casing, wherein an encircling frame is fixed on the motion connecting rod, the casing is fixed with a fixed plate at the bottom of a dust-proof box through a bolt, a proximity switch is fixed in the dust-proof box, the bottom of the dust-proof box is communicated with an air pipe, and the air pipe is communicated with an air pump;

the dustproof box is a hollow box body, an opening is formed in one side face of the dustproof box, and the detection end of the proximity switch is opposite to the opening.

Has the advantages that:

1. the utility model detects the movement of the movement connecting rod of the steam extraction check valve through the proximity switch, is a non-contact detection switch, can ensure the accuracy of detection and simultaneously saves the replacement period.

2. The proximity switch is arranged in the dustproof box, the air pump blows air into the dustproof box, positive pressure is guaranteed in the dustproof box, dust is prevented from entering the dustproof box, the situation that the proximity switch covers the dust and cannot be detected accurately is avoided, and the accuracy and the service cycle of detection are guaranteed.

Description of the drawings:

FIG. 1 is a schematic structural view of the present invention;

in the figure: 1. a steam extraction check valve; 2. a motion link; 3. a housing; 4. an encircling frame; 5. a fixing plate; 6. a proximity switch; 7. a side vertical plate; 8. a dust-proof box; 9. an air tube; 10. an air pump; 11. and (6) opening holes.

The specific implementation mode is as follows:

example 1:

a steam extraction check valve motion detection device comprises a steam extraction check valve 1, a motion connecting rod 2 and a machine shell 3, wherein an encircling frame 4 is fixed on the motion connecting rod, the machine shell is fixed with a fixed plate 5 at the bottom of a dust-proof box 7 through a bolt, a proximity switch 6 is fixed in the dust-proof box, the bottom of the dust-proof box is communicated with an air pipe 9, and the air pipe is communicated with an air pump 10;

the dustproof box is a hollow box body, an opening 11 is formed in one side face of the dustproof box, and the detection end of the proximity switch is opposite to the opening.

The working principle is as follows: when the motion connecting rod moves, the proximity switch acts when the side vertical plate 7 surrounding the frame moves to the proximity switch, the air pump starts to supply air into the dustproof box through the air pipe, positive pressure in the dustproof box is guaranteed, dust is prevented from entering the dustproof box, and the proximity switch is protected.

Claims (1)

1. The utility model provides a steam extraction check valve motion detection device, its constitution is including steam extraction check valve, motion connecting rod and casing, characterized by: an encircling frame is fixed on the motion connecting rod, the shell is fixed with a fixed plate at the bottom of the dust-proof box through a bolt, a proximity switch is fixed in the dust-proof box, the bottom of the dust-proof box is communicated with an air pipe, and the air pipe is communicated with an air pump;

the dustproof box is a hollow box body, an opening is formed in one side face of the dustproof box, and the detection end of the proximity switch is opposite to the opening.

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