CN103775731A

CN103775731A - Limit switch

Info

Publication number: CN103775731A
Application number: CN201210400935.XA
Authority: CN
Inventors: 彭文
Original assignee: SHANGHAI LANPA CONTROL VALVE Co Ltd
Current assignee: SHANGHAI LANPA CONTROL VALVE Co Ltd
Priority date: 2012-10-19
Filing date: 2012-10-19
Publication date: 2014-05-07

Abstract

The invention provides a limit switch. According to the limit switch, the actual opening and closing state of a plurality of control valves which are frequently utilized in the engineering site can be accurately understood in a control room simply and efficiently. The same rotating angle of the limit switch, a pneumatic actuator and the valves can be ensured by a coaxial technology of the limit switch, the pneumatic actuator and the valves. When the valves rotate, the limit switch synchronously rotates, and a shaft of the limit switch is provided with a red cam and a green cam. When the valves are fully opened, an electrical switch of an electrical device and for feeding back an opening signal is compressed by the green rotating cam and accordingly the state of a signal lamp expressing opening in the control room is changed. When the valves are fully closed, an electrical switch of an electrical device and for feeding back a closing signal is compressed by the red rotating cam and accordingly the state of a signal lamp expressing closing in the control room is changed. Accordingly, a user can understand the actual opening and closing state of the site valves in the control room intuitively.

Description

Limit switch

Affiliated technical field

Signal feed back while the present invention relates to pneumatic angle stroke control valve valve wide open or full cut-off, user can directly observe the open/close states of valve site in control room.

Background technique

Pneumatic ball valve, Pneumatic butterfly valve isogonism stroke control valve normally 90 ° of rotations are realized unlatching or close, engineering site generally need to use compared with multiple control valve, the unlatching that these valves have at synchronization, what have closes, do you how accurately to know the open/close states of each control valve? the one, upper engineering site is checked one by one, also having one is to utilize a kind of signal feedback device, and each scene valve opening and closing feedback of status is arrived to control room.Scene is checked one by one, obviously waste time and energy, and the control valve mounting point having is higher, or blocks, and these have all increased on-the-spot difficulty of checking.We need one directly to check at scene, can check in control room unification again the device of valve opening and closing state.

Summary of the invention

In order to check each valve opening and closing state in control room unification, the invention provides a kind of solution.This device is arranged on the top of control valve actuator, and the axle of its bottom directly embeds output shaft, pneumatic actuator band movable valve and the limit switch synchronous rotary of pneumatic actuator.The axle of limit switch and the axle of valve keep identical angle of swing.Produce thus three state: closed condition, neutral position, opening state, each state of the corresponding valve of each state of limit switch.

Closed condition: in the time of valve closing, limit switch can present closed condition, now its red rotating cam presses the electrical switch of the electric device that feeds back shutdown signal, and control room shows that the tutorial light of closing is bright.Now, green rotating cam can not contact electrical switch, and control room shows that the tutorial light of opening does not work.Now upper cover can show redness, the complete demonstration in the inside " CLOSED ".

Neutral position: in the time that valve rotates to neutral position, its red rotating cam leaves electrical switch, the electric device power-off of feedback shutdown signal, control room shows that the tutorial light of closing extinguishes, green rotating cam is coaxial with red rotating cam and cam direction is mutually vertical, now, green rotating cam can not contact electrical switch yet, and control room shows that the tutorial light of opening extinguishes.

Opening state: in the time of valve half-twist, green rotating cam will press the electrical switch of the electric device that feeds back start signal, allows its energising, control room shows that the tutorial light of opening is bright, now, red rotating cam can not contact electrical switch, and control room shows that the tutorial light of closing extinguishes.Now upper cover can show green, the complete demonstration in the inside " OPEN ".

In this invention, whole electric device all adopts circuit board, without any outer drain wire, safety attractive in appearance." CLOSED ", " OPEN " printed words adopt hollow out method to realize at upper cover.Upper cover adopts self-tightening screw to be connected with main body, and when user opens upper cover in wiring, screw can not fall down; While closing upper cover, can guarantee that degree of tightness is suitable.Upper and lower rotating cam adopts cross socket joint, can guarantee definitely vertical.

Accompanying drawing explanation

Fig. 1 is the explosive view of this invention

Fig. 2 is 90 ° of right angle sectional views of this invention

Fig. 3 is the interior views of closed condition, and now its red rotating cam presses the electrical switch of the electric device that feeds back shutdown signal, and green rotating cam is vertical with red rotating cam, can not contact electrical switch.

Fig. 4 is the interior views in neutral position, and now redness does not all contact electrical switch with green rotating cam.

Fig. 5 is the interior views of opening state, and now its green rotating cam presses the electrical switch of the electric device that feeds back start signal, and red rotating cam is vertical with green rotating cam, can not contact electrical switch.

In Fig. 6, " CLOSED ", " OPEN " printed words adopt hollow out method to realize at upper cover, and first figure in left side is its yellow bottom, is inserted in above bottom with the lid of hollow out printed words, and outermost is upper plastic cover.

Fig. 7 is the connection explosion view of axle and rotating cam, and all axles all adopt cross to be socketed up and down, and two rotating cams are socketed on axle.

Fig. 8 is the connection diagram of axle and rotating cam, and below, green rotating cam in the above for red rotating cam.

Fig. 9 is upper cover partial schematic diagram, and upper cover adopts self-tightening screw to be connected with main body.

Figure 10 is this invention internal wiring figure, and in upper figure, 6 is common terminal, is communicated with at ordinary times with 4, and in the time of valve wide open, green rotating cam presses the electrical switch of the electric device that feeds back start signal, and now, port 4 disconnects, and port 5 is communicated with.In figure below, 1 is common terminal, is communicated with at ordinary times with 3, and in the time of valve complete shut-down, red rotating cam presses the electrical switch of the electric device that feeds back shutdown signal, and now, port 3 disconnects, and port 2 is communicated with.

Figure 11 is terminal block figure, and its port one-6 are the port in Figure 10.

Figure 12 is limit switch, pneumatic actuator, valve installation figure.

Embodiment

1, wiring:

The signaling lamp of wishing control room as user extinguishes at ordinary times, and when standard-sized sheet or full cut-off, corresponding signal lamp is bright, represents that the signaling lamp of cutting out connects port 5,6, represents that the signaling lamp of opening connects port one, 2.

Wish that as user the signaling lamp in control room opens at ordinary times, when standard-sized sheet or full cut-off, corresponding signal lamp extinguishes, and represents that the signaling lamp of cutting out connects port 4,6, represents that the signaling lamp of opening connects port one, 3.

2, install: the output shaft that the axle of this invention bottom is directly embedded to pneumatic actuator, the support of this product is connected with bolt with pneumatic actuator, it is consistent that the virtual condition of valve and the state of this invention will guarantee, simultaneously in opening or closed condition.

3, use: in the time that valve rotates, the output shaft of pneumatic actuator can drive the axle synchronous rotary of this invention, the axle of this invention and valve keep same angle of swing, when valve opening or while closing, red or green rotating cam presses the electrical switch of the electric device of feedback signal, the corresponding LED status in control room changes, with the virtual condition of displaying scene valve.

Claims

This invention utilizes limit switch, pneumatic actuator, the coaxial technology of valve to guarantee that three has identical angle of swing, and in the time that valve rotates, limit switch synchronous rotary, is equipped with red and green two cams on the axle of this invention.In the time of valve wide open, green rotating cam presses the electrical switch of the electric device that feeds back start signal, control room represents that the signaling lamp of opening changes state, in the time of valve complete shut-down, red rotating cam presses the electrical switch of the electric device that feeds back shutdown signal, control room represents that the signaling lamp of cutting out changes state, and user can intuitively understand in control room the actual open/close states of on-the-spot each valve.

1. the working principle of this invention.
2. " CLOSED ", " OPEN " printed words adopt hollow out method to realize at upper cover.
3. upper cover adopts self-tightening screw to be connected with main body.
4. upper and lower rotating cam adopts cross socket joint, can guarantee definitely vertical.
5. the profile of this invention.