JP2006063529A - Hydraulic interlock system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology superior in workability, without reducing operability, in a hydraulic interlock system arranged in an explosion-proof area having a plurality of doors. <P>SOLUTION: This hydraulic interlock system is arranged in the explosion-proof area having the plurality of doors; and connects a detecting valve and a controller by a first tube for transmitting fluid pressure to the detecting valve; and connects a lock mechanism part and the controller by a second tube for transmitting the fluid pressure to the lock mechanism part. An individual pipe is arranged in a frame body, and the second tube is stored in this individual pipe, and passes through into the frame body, and is arranged via a pipe feeding metal fitting and the detecting valve periphery. A common pipe reaching the controller periphery is arranged by storing the first tube and the second tube from the detecting valve periphery by an assembly on the detecting valve periphery of the first tube and the second tube. The common pipes in the same number as the number of doors are collected in the controller. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an interlock system, and more particularly to a fluid pressure interlock system using fluid pressure installed in an explosion-proof area.

  Isolation rooms and laboratories of various laboratories may be designated as explosion-proof areas. The explosion-proof area is an area where dangerous materials such as flammable gas and high-concentration oxygen are handled, and the use of electrical equipment is restricted in order to prevent ignition and explosion caused by generation of sparks and heat.

  In addition, when a plurality of doors are provided in one room, an isolation system or an experimental room employs an interlock system to prevent simultaneous opening of two or more doors. This is because if a plurality of doors are opened at the same time, an air flow passing through these doors is generated, and indoor air containing toxic gas or bacteria may flow out of the room. The interlock system is a system that, when one door is opened, automatically locks locks provided on the other doors by remote operation in order to prevent the other doors from being opened.

  In the explosion-proof area, an interlock system using an electric lock for electrical control cannot be used. This is because when an electric lock using a solenoid or a motor as a drive source is used, there is a possibility that contact sparks or coil heating may occur.

  Therefore, a fluid pressure interlock system that detects the open / closed state of the door by fluid pressure such as air pressure or hydraulic pressure and operates the lock mechanism in the locked state and the unlocked state attracts attention. Since the fluid pressure interlock system does not use the solenoid or motor required for the operation of the electric lock, it will not generate sparks or heat, and cause an accident such as ignition or explosion due to the operation of the lock mechanism. Is prevented.

The fluid pressure interlock system includes a detection valve that detects an open / closed state of a door, a lock mechanism that locks or unlocks the door, and a controller that controls the detection valve and the lock mechanism. Fluid pressure is supplied by connecting the detection valve, the controller, and the lock mechanism unit with a tube that transmits fluid pressure (see, for example, Patent Document 1). In addition, between the controller and the lock mechanism, a pipe fitting is provided between the frame around the door and the door, and passes the tube from the frame to the door.
JP 2003-293635 A

  By the way, in the conventional fluid pressure interlock system, the tube that transmits the fluid pressure to the detection valve that detects the opening of the door and the tube that transmits the fluid pressure to the lock mechanism are housed in separate pipes toward the controller. It is extended. That is, the tube that transmits the fluid pressure to the detection valve is housed in the piping from the vicinity of the detection valve and extended toward the controller, and the tube that transmits the fluid pressure to the lock mechanism is stored in another pipe from the vicinity of the fitting. Extend towards the controller.

  For this reason, the controller collects two pipes for each door: a pipe that houses a tube that transmits the fluid pressure to the detection valve and a pipe that houses a tube that transmits the fluid pressure to the lock mechanism. . That is, the controller collects twice as many pipes as the number of doors.

  However, in the fluid pressure interlock system, bending the tube that transmits the fluid pressure has an adverse effect on the operation, and therefore the bending angle is limited. For this reason, the specific problem that it is necessary to take a space for collecting pipes twice as many as the number of doors occurs. This is because it is necessary to make a large space in order to store each tube derived from a predetermined position of the controller in the predetermined pipe without bending when collecting the pipe twice the number of doors in the controller. is there.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to provide a fluid pressure interlock system that is excellent in workability, does not cause a decrease in operability, and operates reliably and has high reliability. It is to provide.

  In the present invention, either one of the tube for transmitting fluid pressure to the detection valve or the tube for transmitting fluid pressure to the lock mechanism is arranged around the detection valve or around the pipe fitting for the detection valve or lock mechanism. Two tubes corresponding to the door are gathered in one place, and individual pipes are installed in the frame to gather the tubes around the door.

  By installing individual pipes in the frame and collecting the tubes around the door, the tubes from the controller corresponding to one door can be stored in one pipe.

  That is, in order to solve the above problem, the invention according to claim 1 is a fluid pressure interlock system installed in an explosion-proof area having a plurality of doors and a frame around the door, and is installed in the door. A locking mechanism that unlocks or locks by fluid pressure, a detection valve that detects opening and closing of the door by fluid pressure, and an opening and closing of one of the plurality of doors. When the detection valve detects, a controller that supplies fluid pressure to the lock mechanism portion installed in another door to lock the lock mechanism portion, and is arranged between the detection valve and the controller, A first tube that transmits fluid pressure to the detection valve; a second tube that is disposed between the lock mechanism portion and the controller; and that transmits fluid pressure to the lock mechanism portion; the frame body; Interposed between the first tube and the first tube At least one pipe fitting for passing the tube from the frame to the door, and the first tube and the second tube around the door through the first tube or the second tube. And a separate pipe for collecting the second tubes, and a common pipe for storing the collected first tubes and the second tubes and reaching the periphery of the controller.

  The detection valve is arranged in the frame body, and extends along the frame body between the detection valve and the pipe fitting, instead of the individual pipe, and the detection valve and the pipe pipe A cover that covers both the frame side of the metal fitting, and the cover is configured to collect the first tube and the second tube around the door through the first tube or the second tube. (Corresponding to the invention of claim 2). In this case, the cover has a function of individual piping in addition to the function of protecting the detection valve and the pipe fitting from the mortar in the frame.

  The guide further comprises a cover that is embedded in the frame and covers the frame side of the pipe fitting, and the cover is a single pipe that is erected on the cover and extends to the back of the ceiling of the explosion-proof area. A pipe may be provided, and the individual pipe may gather the first tube and the second tube around the pipe fitting, and the common pipe may include the guide pipe. Equivalent to the invention).

  In the fluid pressure interlock system according to the present invention, an individual pipe is installed in the frame, and a tube for transmitting fluid pressure to the lock mechanism is extended through the frame to the vicinity of the detection valve. The tube transmitting the fluid pressure and the tube transmitting the fluid pressure to the lock mechanism are assembled. Accordingly, the tube that transmits the fluid pressure from the periphery of the detection valve to the detection valve and the tube that transmits the fluid pressure to the lock mechanism can be accommodated in the common piping, and the common piping of each door is assembled around the controller. be able to.

  Since it is sufficient to gather the same number of common pipes as the number of doors around the controller, the amount of necessary pipes and the time required for construction can be halved, and the common pipes should not be bent. And the operability of the fluid pressure interlock system is improved.

  Hereinafter, a preferred embodiment of a fluid pressure interlock system according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a configuration diagram of a fluid pressure interlock system according to the first embodiment. FIG. 2 is a cross-sectional view of a sensing valve used in a fluid pressure interlock system. FIG. 3 is a perspective view of a pipe fitting used in the fluid pressure interlock system. FIG. 4 is a cross-sectional view of the lock mechanism used in the fluid pressure interlock system. FIG. 5 is a configuration diagram around the door according to the second embodiment. FIG. 6 is a configuration diagram around the door according to the third embodiment. FIG. 7 is a configuration diagram around the door according to the fourth embodiment. FIG. 8 is a configuration diagram around the door according to the fifth embodiment.

(First embodiment)
As shown in FIG. 1, the fluid pressure interlock system 1 according to the present embodiment includes a controller 2, a detection valve 3 installed in a frame 12 surrounding the door 11, and the door 11 and the frame 12. The lock mechanism part pipe fitting 40 is provided to be interposed between the suspension base and the lock mechanism part 5 installed on the door 11. The controller 2 and the detection valve 3 are connected by a tube 8 (hereinafter referred to as “detection valve tube”) that transmits fluid pressure to the detection valve 3, and the controller 2 and the lock mechanism 5 are A tube (second lock tube) (hereinafter referred to as a “lock mechanism section tube”) 9 that transmits fluid pressure to the lock mechanism section 5 through the lock mechanism section pipe fitting 40 is connected.

  In a non-illustrated explosion-proof area, a plurality of doors 11, 12... And corresponding frame bodies 12, 12. Are installed corresponding to the number of doors 11. In the present embodiment, only two frame bodies 12 and 12 corresponding to the two doors 11 and 11 are shown in FIG.

  In the fluid pressure interlock system 1, fluid pressure is supplied from a compressor (not shown) to the controller 2, and the controller 2 controls supply of the fluid pressure to the detection valve 3 and the lock mechanism unit 5. By this control, the detection unit 3 detects the door 11 that is unlocked and opened, and the other door 11 is automatically locked by the lock mechanism unit 5. Here, the fluid pressure used in the present embodiment may be a pressure due to a gas such as air pressure, or may be a pressure due to a liquid such as hydraulic pressure. That is, the system operates when the controller 2 applies pressure from the compressor to the air and oil in the tubes 8 and 9 and discharges the air and oil in the tubes.

  As shown in FIGS. 1 and 2, the detection valve 3 is a conventionally known one, and is installed in the lower part of the upper frame of the frame body 12, so that the arm with roller 3 a that contacts the door 11 when the door 11 is closed. And a plunger 3b installed right above the arm with roller, and a valve body 3c and a valve seat 3d installed above the plunger 3b. A spring body 3e is disposed on the upper portion of the plunger 3b, and a spring body 3f is disposed on the upper portion of the valve body 3c. The spring bodies 3e and 3f are urged in the protruding direction of the plunger 3b, respectively. In the detection valve 3, a detection valve tube 8 is connected to the inlet 3 g and the outlet 3 h of the detection valve 3, and the fluid circulates between the controller 2. The inlet 3g and the outlet 3h of the detection valve 3 are connected or disconnected by the valve body 3c.

  The detection valve 3 detects opening / closing of the door 11 based on whether or not the plunger 3b is pressed by the arm 3a with roller. When the roller-equipped arm 3a and the door 11 are separated by opening the door 11, the pressed plunger 3b protrudes by the urging force of the spring body 3e and detects the open state of the door 11. When the door 11 is closed and the arm 3a with roller and the door 11 come into contact with each other, the plunger 3b is pushed back and detects the closed state of the door 11.

  The detection valve 3 that detects the opening / closing of the door 11 notifies the controller 2 of the opening / closing state of the door 11 by the valve body 3c. When detecting the opening of the door 11, the detection valve 3 presses the valve body 3c against the valve seat 3d by the biasing force of the spring body 3f in conjunction with the protrusion of the plunger 3b. When the valve body 3c is pressed against the valve seat 3d, the inside of the detection valve 3 is disconnected, the fluid pressure in the detection valve tube 8 is shut off, and the controller 2 is notified of the open state of the door 11. When the door 11 is closed, the plunger 3b is retracted by the arm 3a with a roller to separate the valve body 3c from the valve seat 3d. Due to the separation of the valve body 3c and the valve seat 3d, the inside of the detection valve 3 is brought into communication, the fluid pressure in the detection valve tube 8 returns to the controller 2, and the controller 2 is notified of the closed state of the door 11.

  As shown in FIG. 3, the locking mechanism portion through-tube fitting 40 is interposed between the suspension base side of the frame body 12 and the door 11. The lock mechanism portion through fitting 40 includes a frame-side main body 4a embedded flush with the suspension base side of the frame 12, a door-side main body 4b embedded flush with the side surface of the door 11, and a frame-side main body. It is comprised with the hollow cable 4c which connects a door side main body. The lock mechanism portion through-hole fitting 40 passes the lock mechanism portion tube 9 from the suspension side of the frame body 12 to the door 11 side through the lock mechanism portion tube 9 in the hollow cable 4c.

  The lock mechanism 5 is a conventionally known one and is installed inside the door 11. As shown in FIG. 4, the lock mechanism 5 has a cylinder 5 a connected to the lock mechanism tube 9. A lock mechanism tube 9 is connected to the inlet / outlet of the cylinder 5a.

  One end of a rod 5b that appears and disappears in conjunction with pressurization and discharge by fluid pressure to the cylinder 5a is connected to the cylinder 5a, and a rotatable transmission mechanism 5c is connected to the other end of the rod 5b. A locking member 5d is connected to the transmission mechanism 5c, and a lock rod 5e having a locking portion is installed below the one end of the locking member 5d so as to be able to protrude and retract from the locking mechanism portion 5.

  The lock bar 5e is configured to protrude in two stages, and is in a state of maximum protrusion when the door is closed. When the locking member 5d is operated in the closed state in which the door protrudes to the maximum and is locked to the locking portion of the lock rod 5e, the locked state is established in which the lock rod 5e is prevented from moving backward due to the rotation of a handle such as a knob.

  While the fluid pressure is being applied from the controller 2, the lock mechanism 5 is moved forward by the pressurization of the fluid pressure to the cylinder 5a, and the transmission mechanism 5c is locked in conjunction with the rod 5b. The member 5d is locked to the locking portion of the lock rod 5e. In this state, the lock lever 5e is prevented from retreating into the lock mechanism 5 by a handle operation. While the fluid pressure is applied to the lock mechanism 5, the door 11 is locked by the lock mechanism 5.

  On the other hand, if no fluid pressure is applied to the locking mechanism 5, the locking member 5d and the lock rod 5e are unlocked, and if the handle is turned, the locking member 5d can be retracted to open the door. it can. That is, the lock mechanism unit 5 unlocks or locks the door 11 with fluid pressure.

  In addition, the locking member 5d of the lock mechanism unit 5 can be actuated by operating a manual operation member such as a cylinder lock or a thumb turn to obtain a locked state and an unlocked state.

  The controller 2 is installed outside the explosion-proof area. When the detection valve 3 detects the opening of one of the plurality of doors 11 and 11 and the detection is notified, the lock mechanism 5 of the other door 11 locks the other door 11. . That is, when the fluid pressure returns from the detection valve 3, control is performed to supply the fluid pressure to the lock mechanism unit 5 installed on the door 11 other than the detection valve 3.

  In the fluid pressure interlock system 1, when one door 11 is opened, the detection valve 3 detects the opening of the door 11, and returns the fluid pressure to the controller 2 to notify the opening of the door 11. To do. When the fluid pressure returns from the detection valve 3 and the opening of the door 11 is notified, the controller 2 supplies the fluid pressure to the lock mechanism unit 5 installed in the other door 11. When the fluid pressure is supplied to the lock mechanism unit 5, the lock member 5 d is locked to the lock rod 5 e, and the other door 11 is brought into a lock state.

  In such a fluid pressure interlock system 1, as shown in FIG. 1, the lock mechanism section tube 9 is led out from the lock mechanism section 5 and passes through the lock mechanism section pipe fitting 40. Further, the lock mechanism portion pipe fitting 40 passes through the inside of the frame 12, extends to the periphery of the detection valve 3, and extends from the periphery of the detection valve 3 toward the controller 2. That is, the fluid pressure interlock system 1 collects the detection valve tube 8 and the lock mechanism tube 9 around the detection valve 3.

  In the frame body 12, the individual pipe 7 is installed between the detection valve 3 and the lock mechanism portion pipe fitting 40. The individual pipe 7 accommodates a lock mechanism tube 9 that passes through the inside of the frame body 12, and prevents bending due to the lock mechanism tube 9 penetrating a mortar (not shown) inside the frame body 12.

  As shown in FIG. 1, in the fluid pressure interlock system 1, the detection valve tube 8 and the lock mechanism tube 9 are gathered around the detection valve 3 by the individual pipes 7 inside the frame 12. As shown in FIG. 8 and the lock mechanism section tube 9 are accommodated in one common pipe 6 extending from the periphery of the controller 2. That is, in this fluid pressure interlock system 1, common pipes 6 corresponding to the number of doors 11 gather around the controller 2.

  The common pipe 6 has a controller 2 that is connected to the periphery of the controller 2 in two lines, one for the detection valve tube 8 and one for the lock mechanism tube 9 around one door. Simplify the layout of piping around That is, conventionally, two pipes from the controller 2 are required per door, but in the present invention, one pipe is sufficient. Therefore, the amount of necessary piping and the time required for construction can be halved, the occurrence rate of malfunctions of the detection valve 3 and the lock mechanism 5 can be reduced, and deterioration in operability can be prevented.

  In addition, as shown in FIG. 2, such a fluid pressure interlock system 1 is provided with a detection valve cover 10a so as to cover the detection valve 3 from the back, and as shown in FIG. The lock mechanism portion through metal fitting cover 10b is installed so as to cover the frame side main body of the through metal fitting 40 from the back.

  The detection valve cover 10 a and the lock mechanism portion through-fitting metal cover 10 b are embedded in the mortar of the frame 12. Each tube passes through the detection valve cover 10a and the lock mechanism portion through-metal fitting cover 10b, and each cover is sealed to maintain airtightness.

  The individual pipe 7 can be formed by jointing the upper frame portion and the suspension base portion of the frame body 12. In this case, the upper surface of the lock mechanism portion pipe fitting cover 10 b is preliminarily formed before construction. It can be set as the cover which made the suspension part of the individual piping 7 stand upright.

(Second embodiment)
As shown in FIG. 6, the fluid pressure interlock system 1 according to the present embodiment is derived from the detection valve 3, and the detection valve tube 8 passes through the inside of the frame body 12 and passes through the vicinity of the lock mechanism portion pipe fitting 40. Then, the result is returned to the controller 2. That is, the tubes are assembled in the vicinity of the lock mechanism portion pipe fitting 40.

  In the fluid pressure interlock system 1, an individual pipe 7 that houses the detection valve tube 8 is installed in the upper frame of the frame 12. As a result, the detection valve tube 8 can pass through the vicinity of the lock mechanism portion pipe fitting 40.

  A common pipe 6 for housing the tubes 8 and 9 is arranged from the lock mechanism portion tube fitting cover 10b by gathering the tubes 8 and 9 near the lock mechanism portion tube fitting 40. The common pipe 6 is composed of a guide pipe 6a that is a single pipe from at least the lock mechanism portion through-metal fitting cover 10b to the ceiling. That is, in the present embodiment, the pipe fitting work for connecting the pipes at the boundary between the frame body 12 and the ceiling side wall surface is not performed. In the present embodiment, the lock mechanism portion through-metal fitting cover 10b in which the guide pipe 6a extending up to the back of the ceiling is erected is a component of the fluid pressure interlock system 1. This guide pipe 6 a becomes a part of the common pipe 6.

  Also with this fluid pressure interlock system 1, the common pipe 6 can be installed, and the number of pipes gathered around the controller 2 can be reduced to the same number as the number of doors. Therefore, the space around the controller 2 can be easily secured.

(Third embodiment)
As shown in FIG. 7, the fluid pressure interlock system 1 according to the present embodiment is a suitable form when the door 11 in the explosion-proof area is a parent-child door. When the door 11 is a parent-child door, the detection valve 3 is installed in the child door 11b, and the arm 3a with a roller is brought into contact with the parent door 11a.

  In the fluid pressure interlock system 1, a detection valve pipe fitting 41 is interposed between the suspension base of the child door 11 b and the frame body 12. This detection valve pipe fitting 41 has the same function as the locking mechanism pipe fitting 40, and introduces and leads the fluid pressure from the frame 12 to the detection valve installed on the child door 11 b through the detection valve tube 8. Let

  In such a fluid pressure interlock system 1, both the lock mechanism portion pipe fitting 40 and the detection valve pipe fitting 41 are covered with a mortar cover. The detection valve pipe fitting 41 is covered with a detection valve pipe fitting cover 10c whose surface is sealed.

  In the case of the fluid pressure interlock system 1 of the present embodiment, the lock mechanism tube 9 passes through the upper frame of the frame body 12 and reaches the controller 2 through the vicinity of the detection valve pipe fitting 41. In the upper frame of the frame body 12, the individual pipe 7 passes from above the lock mechanism portion tube fitting cover 10 b to the detection valve tube fitting cover 10 c and houses the lock mechanism portion tube 9. That is, in the present embodiment, the individual pipes 7 are arranged through the upper frame of the frame body, and the detection valve tube 8 and the lock mechanism section tube 9 gather near the detection valve pipe fitting 41.

  A common pipe 6 for housing the tubes is arranged from the detection valve pipe fitting cover 10c by gathering the tubes near the detection valve pipe fitting 41. Also in the present embodiment, the detection valve through-hole fitting cover 10c in which the guide pipe 6 extending up to the back of the ceiling is erected on the upper surface is arranged as in the second embodiment, and the guide pipe 6a is the common pipe 6. Part of

  Also in the fluid pressure interlock system 1 of the present embodiment, the number of pipes from the controller 2 per door can be reduced to one pipe per door compared to the conventional case where two pipes from the controller 2 are required. Therefore, the amount of necessary piping and the time required for construction can be halved, the occurrence rate of malfunctions of the detection valve 3 and the lock mechanism 5 can be reduced, and deterioration in operability can be prevented.

(Fourth embodiment)
In the fluid pressure interlock system 1 according to the present embodiment, as shown in FIG. 8, the detection valve 3 is installed in the lock mechanism unit 5 and detects the opening of the door due to the rotation of a handle such as a knob. . The fluid pressure interlock system 1 includes a detection valve tube fitting 41 through which the detection valve tube 8 is passed and a lock mechanism tube fitting 40 through which the lock mechanism tube 9 is passed. It is interposed between. The lock mechanism part pipe fitting 40 and the detection valve pipe fitting 41 are installed close to each other. The dual-purpose cover 13 is embedded in the frame 12 so as to cover both the pipe fittings 40 and 41.

  In the fluid pressure interlock system 1, the detection valve tube 8 and the lock mechanism section tube 9 are gathered around the lock mechanism section pipe fitting 40 and the detection valve pipe fitting 41. That is, in this case, the tubes 8 and 9 can be gathered by the dual-purpose cover 13 instead of the individual pipe 7. With this assembly, the detection valve tube 8 and the lock mechanism tube 9 are accommodated in the common pipe 6 and connected to the controller 2. In the dual-purpose cover 13, a guide pipe 6 a extends up to the back of the ceiling and constitutes a part of the common pipe 6.

  In the present embodiment, the amount of necessary piping and the time required for construction can be halved, the occurrence rate of malfunctions of the detection valve 3 and the lock mechanism 5 can be reduced, and deterioration in operability can be prevented. In addition, the guide pipe 11 standing up to the ceiling of the explosion-proof area facilitates construction when the fluid pressure interlock system 1 is installed.

(Fifth embodiment)
In the fluid pressure interlock system 1 according to the present embodiment, a cover in which a detection valve cover 9 and a pipe fitting cover 10 are integrally formed is attached to a frame body 12. As shown in FIG. 5, the dual-purpose cover 13 that covers both the lock mechanism portion pipe fitting 40 installed at the base of the frame 12 and the detection valve 3 installed on the upper frame of the frame 12 is integrally formed. Installed as a covered cover. The dual-purpose cover 13 is an L-shaped cover whose surface is sealed, and has both functions of the detection valve cover 10a and the lock mechanism portion pipe fitting cover 10b of the first embodiment. Furthermore, the dual-purpose cover 13 also functions as the individual pipe 7.

  That is, even if the individual pipe 7 is eliminated, the lock mechanism tube 9 is not bent by the mortar, and the fluid pressure leakage in the dual-purpose cover 13 can be prevented. Can be improved as well.

It is a block diagram of the fluid pressure interlock system which concerns on 1st embodiment. It is sectional drawing of the detection valve used for a fluid pressure interlock system. It is a perspective view of the pipe fitting used for a fluid pressure interlock system. It is sectional drawing of the lock mechanism part used for a fluid pressure interlock system. It is a block diagram of the door periphery which concerns on 2nd embodiment. It is a block diagram of the door periphery which concerns on 3rd embodiment. It is a block diagram of the door periphery which concerns on 4th embodiment. It is a block diagram of the door periphery which concerns on 5th embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid pressure interlock system 2 Controller 3 Detection valve 40 Pipe fitting for lock mechanism part 41 Pipe fitting for detection valve 5 Lock mechanism part 6 Common piping 6a Guide pipe 7 Individual pipe 8 Detection valve tube 9 Lock mechanism part tube 10a Detection valve cover 10b Pipe fitting cover for lock mechanism 10c Detection valve cover fitting 11 Door 12 Frame 13 Combined cover

Claims (3)

A fluid pressure interlock system installed in an explosion-proof area having a plurality of doors and surrounding frames.
A locking mechanism installed on the door and unlocked or locked by fluid pressure;
A detection valve for detecting the opening and closing of the door and notifying the opening and closing of the door by fluid pressure;
When the detection valve detects the opening of one of the plurality of doors, a controller that supplies fluid pressure to the lock mechanism installed in the other door to lock the lock mechanism,
A first tube disposed between the detection valve and the controller and transmitting fluid pressure to the detection valve;
A second tube that is arranged between the lock mechanism and the controller and transmits fluid pressure to the lock mechanism;
At least one pipe fitting that is interposed between the frame and the door, and passes the first tube or the second tube from the frame to the door;
Individual piping arranged in the frame body, and collecting the first tube and the second tube around the door through the first tube or the second tube;
A common pipe that houses the assembled first tube and the second tube and reaches around the controller;
Providing
Fluid pressure interlock system characterized by The detection valve is disposed on the frame,
Instead of the individual pipes, a cover is provided that extends along the frame between the detection valve and the pipe fitting, and covers both the detection valve and the frame side of the pipe fitting,
The cover collects the first tube and the second tube around the door through the first tube or the second tube;
The fluid pressure interlock system according to claim 1. A cover that is embedded in the frame body and covers the frame body side of the pipe fitting;
The cover includes a guide pipe that is erected on the cover and includes a single pipe that extends to the ceiling of the explosion-proof area.
The individual pipe is a collection of the first tube and the second tube around the pipe fitting,
The common pipe includes the guide pipe;
The fluid pressure interlock system according to claim 1.

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