JP2941455B2 - Vacuum breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum breaking device in a vacuum suction type transport device.

[0002] Regarding the collection and discharge of wastewater containing a lot of mud, such as muddy water treatment of a segment invert in the shield method, for example, the above wastewater is sucked into a vacuum tank which is made negative pressure by the suction action of a vacuum pump. When the inside of the vacuum tank becomes full, the submersible sand pump drains sewage.However, at this time, the vacuum pump is used so that the head of the submersible sand pump is not insufficient and the vacuum pump does not suck in foreign substances. A vacuum breaker is operated to bring the inside of the tank closer to the atmospheric pressure.

[0003]

2. Description of the Related Art Hitherto, a pilot kick type solenoid valve has been used in the above-mentioned vacuum breaker.

[0004]

However, as a drawback of the pilot kick type solenoid valve, a completely closed state cannot be obtained because the air pushes up the valve body at the time of closing operation. To solve this, the valve size must be increased. Therefore, it is necessary to reduce the flow velocity and the force for pushing up the valve body, and unless a large solenoid valve is used for the pipe size, it will not function effectively as a vacuum breaker.

[0005] An object of the present invention is to operate the valve element smoothly and smoothly, maintain a completely closed state, and effectively function with a large gas passage area by rational opening operation. The purpose is to constitute a vacuum breaker.

[0006]

A vacuum breaker according to the present invention has an electric motor having a mechanism for changing a rotary motion into a reciprocating linear motion, and a peripheral portion of the back surface of a parent valve having a vent hole formed at the center. The child valve is detachably opposed to the outlet opening surface of the intake pipe drawn out of the vacuum tank, and the tip end of the rod drawn out of the prime mover is detachably opposed to the hole edge surface of the ventilation hole. It was mounted on the guide under the tip of the rod that Kudasare guide through said vent holes are implanted in the heart of the child valve
The edge is detachably opposed to the back of the parent valve and the peripheral side is open
The formed locking body mounted on the derivation opening surface of the intake pipe with closing the vent hole is not blocked by contact activation of the parent valve by Koben proximate operating with the rod, also, together with the rod When the child valve operates to separate, the vent hole is opened and the locking member approaches the back surface of the parent valve, and the locking member presses the rear surface of the parent valve by continuing the separation operation of the child valve. This is configured to be separated from the outlet opening surface of the intake pipe.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments will be described below with reference to the drawings.

Reference numeral 1 denotes a prime mover having a mechanism for changing a rotary motion into a reciprocating motion. For example, a linear motor in which a small AC motor and a rack and pinion mechanism are combined is used. Reference numeral 2 denotes an intake pipe led out of a vacuum tank, and reference numeral 3 denotes a parent valve having a vent hole 4 formed at the center, and a peripheral portion of the back surface thereof is detachably opposed to a lead-out opening surface 2e of the intake pipe 2. 5 is a rod derived from the prime mover 1, 6, 6 is a tilt cam attached to the rod 5, 7, 7 is a tilt cam 6,
The motor 1 is turned on and off by moving away from and
This is a limit switch for activating / stopping the linear motion of the rod 5 by adjusting the position of the device. At the distal end of the rod 5 is provided a pulp mechanism 8 that expands and contracts in the axial direction. A child valve 9 that faces the hole edge surface of the ventilation hole 4 via the pulp mechanism 8 so as to be able to freely contact and separate is provided. Be attached. 10 that Kudasare guide through the vent holes 4 is implanted in the heart of Koben 9 rod, 11
Upper edge is engaging body mounted on the guide under the tip of the rod 10 so as to oppose freely back surface and the disjunction of Oyaben 3, peripheral side portion
Is that has been formed in the open state.

[0009] For collecting and discharging wastewater containing a lot of mud, such as muddy water treatment of a segment invert in the shield method, for example, the above-mentioned wastewater is sucked into a vacuum tank which is made negative pressure by the suction action of a vacuum pump. 2. Description of the Related Art A vacuum suction-type transport device that discharges wastewater with a submersible sand pump when the inside of a vacuum tank is full is known.

In this type of apparatus, it is necessary to maintain the inside of the vacuum tank at a negative pressure when collecting waste water. In this case, when the motor 1 is driven to lower the rod 5, the child valve 9 is also lowered to close the vent hole 4, and the peripheral portion of the back surface of the master valve 3 is led out of the intake pipe 2 by the pressing force. The opening surface 2e is closed. The slight excessive lowering of the rod 5 after the closing of the vent hole 4 and the outlet opening surface 2e is absorbed by the pillow mechanism 8, and the driving of the prime mover 1 is performed by the inclination cam 6 pressing the actuator of the lower limit switch 7. After stopping, the rod 5 also stops at the lowered position. When the outlet opening surface 2e of the intake pipe 2 and the vent hole 4 are in a closed state,
Since the external air pressure acts on the surfaces of the parent valve 3 and the child valve 9, the closed state is completely maintained.

When the water level in the vacuum tank rises and becomes full, the contaminated water in the vacuum tank is discharged by a submersible sand pump or the like. It is necessary to bring the inside close to the atmospheric pressure. Further, in order to prevent the vacuum pump from sucking foreign matter, it is necessary to bring the inside of the vacuum tank close to the atmospheric pressure when it is full. In order to bring the inside of the vacuum tank closer to the atmospheric pressure, the prime mover 1 is driven to raise the rod 5 so that the child valve 9 is first isolated from the master valve 3 and the vent hole 4 is opened to reduce the pressure difference between the inside and outside. The rod 5 is continued to be raised while reducing the pressure, and the back surface of the master valve 3 is pressed by the locking body 11, and this is pushed out to the outlet opening surface 2 e of the intake pipe 2.
By separating the air passage from the air passage, an air passage having a large passage area is formed. When the tilt cam 6 presses the actuator of the upper limit switch 7, the driving of the prime mover 1 is stopped, the rod 5 is also stopped, and the master valve 3 and the slave valve 9 are stopped.
Also stops at a predetermined ascending position. These ascending and stopping positions can be arbitrarily set by changing the mounting position of the upper limit switch 7. For example, only the child valve 9 is opened and the master valve 3 is It is also possible to remain in the closed state, so that the degree of vacuum in the vacuum tank can be made variable.

[0012]

According to the device of the present invention, since the child valve 9 is first opened to open the parent valve 3 while reducing the pressure difference between the inside and the outside, the valve body is operated smoothly without difficulty. In addition, since the valve element is moved by a linear reciprocating motion instead of a rotating motion as in the related art, a large gas passage area is obtained, and the vacuum breaking action effectively functions.

When the outlet opening surface 2e and the vent hole 4 of the intake pipe 2 are closed, external pressure acts on the surfaces of the master valve 3 and the slave valve 9, so that the closed state of the vacuum tank is completely maintained. Can be done.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part of a vacuum breaking device of the present invention, showing a state when an air passage is closed.

FIG. 2 is a vertical sectional side view of a main part of the vacuum breaker of the present invention, showing a state when an air passage is opened.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 A prime mover provided with a mechanism for changing a rotary motion into a reciprocating linear motion 2 Intake pipe 2 e Outlet opening surface 3 Parent valve 4 Vent hole 5 Rod 9 Child valve 10 Rod 11 Locking body

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 55-158366 (JP, U) Japanese Utility Model Sho 58-101057 (JP, U) Japanese Utility Model Sho 60-1491 (JP, Y2) (58) Field (Int.Cl. ⁶ , DB name) F16K 24/06 E21D 9/12 F16K 1/44

Claims (1)

(57) [Claims] 1. A motor (1) having a mechanism for changing a rotary motion into a reciprocating linear motion, and a peripheral portion of a back surface of a main valve (3) having a vent hole (4) formed at the center is led out from a vacuum tank. The leading end of a rod (5) led out from the motor (1) is detachably opposed to the lead-out opening surface (2e) of the drawn intake pipe (2). the surface and the disjunction freely opposing Koben (9) is mounted, the child valve (9) wherein is implanted in the heart vent (4) rod (10) that Kudasare guide through the At the lower end of the guide , a locking body (11) having an upper end edge detachably opposed to the back surface of the parent valve (3) and a peripheral side part formed in an open state is attached, and is brought into close proximity with the rod (5). The vent hole (4) is closed by the operated child valve (9), and the outlet opening surface (2e) of the intake pipe (2) is closed by the contact operation of the master valve (3). Further, when the child valve (9) moves apart from the rod (5), the vent hole (4) is opened, and the locking member (11) approaches the back surface of the parent valve (3). As the separating operation of (9) is continued, the locking body (11) presses the back surface of the master valve (3) to separate it from the outlet opening surface (2e) of the intake pipe (2). A vacuum breaking device characterized by the above.