JPH1061808A - Vacuum valve for sucking sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum valve for sucking sludge to start to suck sludge with a vacuum valve valve element opened in an intermediate state and eliminate a fear of a gap between the vacuum valve valve element and a drum body being closed with a foreign matter. SOLUTION: A vacuum valve for sucking sludge is formed such that the valve is arranged between a suction part 3 having a tip arranged in a sludge inlet and a vacuum system 5 to transfer sludge by a vacuum suction force, the suction pipe 3 and the vacuum system are intercommunicated through opening and shut off through closing, the vacuum valve is opened with the valve element 6 separated away from an opening forced in a drum body 7 and closed with the valve element 6 brought into contact with the opening, and the opening force of the valve element 6 forms a vacuum suction force exerted from the vacuum system and forms a spring force incorporating a closing power. A magnetic material plate 4f is arranged on the valve element 6 side, and a magnet 4h to exert a suction force in a closing direction on the magnetic material plate 4f is arranged on the valve frame body 4e side and the closing power of the valve element 6 is added to the rebound of the spring 4a, and a total power of the closing power and the rebound forms the magnetic suction force of the magnet 4h.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage suction vacuum valve used in all kinds of sewage suction and transfer systems.

[0002]

2. Description of the Related Art In a sewage vacuum suction transfer system in which a sewage basin is arranged in a wide area and sewage collected in the sewage basin is transferred to a predetermined place such as a sewage treatment plant using vacuum pressure, 2. Description of the Related Art A sewage suction vacuum valve is used to connect and shut off a sewage suction pipe arranged in a sewage tank and a vacuum system. FIG. 3 is a diagram showing an example of the configuration of a conventional vacuum valve control device using this kind of vacuum valve for sucking sewage disclosed in the specification and drawings of Japanese Patent Application No. 7-39362.

In FIG. 3, reference numeral 1 denotes a sewage tank, into which a tip of a suction pipe 3 is inserted, and a rear end of the suction pipe 3 is connected to a vacuum tank via a vacuum valve 6. It is connected to a communicating line (vacuum system) 5. Reference numeral 4 denotes a vacuum valve main body. The vacuum valve main body includes a diaphragm 4b and a spring 4a for urging the diaphragm 4b in a piston chamber 4c.

Reference numeral 11 denotes a control device for controlling the vacuum valve body 4. The control device 11 includes a casing 12, and the casing 12 has a structure in which a large diameter portion 12a and a small diameter portion 12b are integrated. The large-diameter portion 12a is provided with a partition wall 15 through which the shaft 14 of the valve body 13 penetrates at the center, and is divided into left and right chambers. The left chamber is divided into a first chamber 17 and a second chamber 18 by a second diaphragm 16 provided at the center, and is separated from a third chamber 20 by a first diaphragm 19 provided at the center of the right chamber. It is divided into a fourth chamber 21. The small-diameter portion 12 b is divided into left and right chambers by a partition 22, and the left chamber communicates with the fourth chamber 21, and the right chamber is divided into a fifth chamber 24 and a sixth chamber 25 by a partition 23.

The valve body 13 fixed to the tip of the shaft 14
The rear end of the shaft 14 is fixed to the center of the second diaphragm 16. The shaft 14 is a partition 15
, And the first diaphragm 19 is inserted (the first diaphragm 19 is fixed to the rear end of the shaft 14), and further passes through the partition walls 22 and 23. The shaft 14 is provided with a seal mechanism at a penetrating portion penetrating the partition wall 15, and the penetrating portion penetrating the partition wall 22 is provided with a seal mechanism. A hole 23a is provided. Reference numeral 28 denotes a spring for pushing the first diaphragm 19 to the left.

A magnet 29 is provided on the rear end wall of the casing 12 at a position facing the rear end of the shaft 14 (fixing screw 14a made of a magnetic material). The sixth chamber 25 is opened and closed by the valve 13 and provided with a hole 30 communicating with the atmosphere. The suction pipe 3 is provided with pressure detection holes 9 and 10 at predetermined intervals in the upper and lower directions. The pressure detection hole 9 communicates with the fourth chamber 21 through a pipe 31, and the pressure detection hole 10 communicates with the third chamber 20 through a pipe 32. , And the pressure sensor pipe 2 communicates with the first chamber 17 through a pipe 33. The second chamber 18 communicates with the atmosphere through a hole 34. The fifth chamber 24 communicates with the line 5 via a pipe 35, and the sixth chamber 25 communicates with the piston chamber 4c of the vacuum valve body 4 via a pipe 36.

In the vacuum valve control device having the above-described structure, when the level of the sewage in the sewage tank 1 rises and the pressure in the pressure sensor pipe 2 rises, the pressure passes through the pipe 33 and the control device 11
Is transmitted to the first room 17 in the inside. As a result, the second diaphragm 16 moves to the right by overcoming the elastic force of the spring 28 and the magnetic attraction force of the magnet 29, and pushes the shaft 14 so that the valve 13
Closes the hole 30 communicating with the atmosphere. Then, a vacuum is supplied from the line 5 through the pipe 35 to the fifth chamber 24 and the sixth chamber 25.
To the piston chamber 4c of the vacuum valve body 4. As a result, the vacuum valve body 6 is pulled up from the opening of the body 7 and is separated from the hole provided in the body 7.

At this time, when the second diaphragm 16 is pushed by the pressure of the pressure sensor tube 2 and the shaft 14 starts to move, the resilience of the spring 28 increases with the movement, but the magnetic attraction of the magnet 29 Since the force decreases rapidly (inversely proportional to the square of the moving distance), the shaft 14 moves at a stroke to the moving end, that is, the position where the valve body 13 closes the hole 30.

When the vacuum valve 6 is lifted from the opening of the body 7, the line 5 and the suction pipe 3 communicate with each other, so that sewage starts to be sucked, and a pressure difference between the pressure detection holes 9 and 10 is generated. Which occurs through pipes 31 and 32 in the fourth chamber 2
It is transmitted to each of the first and third chambers 20. This differential pressure becomes a force for pushing the first diaphragm 19 to the right, and the valve body 13 is further pushed to the right via the shaft 14. Even if the water level of the sewage drops and the pressure difference between the first chamber 17 and the second chamber 18 disappears, while the sewage flows through the suction pipe 3, the fourth chamber 21
Due to the pressure difference between the first and third chambers 20, the valve 13 remains pressed to the right.

When the water level of the sewage drops further and the lower end of the suction pipe 3 sucks air, the pressure difference between the pressure detecting hole 9 and the pressure detecting hole 10 disappears.
The diaphragm 19 is pushed to the left and the valve body 13 is pushed to the left to close the through hole 23a of the partition wall 23. Thereby, the air flows into the sixth chamber 25, and the air is
6, the valve body 6 is returned to the piston chamber 4c of the vacuum valve body 4 by the resilience of the spring 4a, and closes the opening of the body 7 between the suction pipe 3 and the line 5; 3 cuts off the communication of the line 5.

[0011]

In the above-mentioned conventional vacuum valve control device, a command to open the valve is issued from the control device 11,
The vacuum from the line 5 is transmitted to the piston chamber 4c to open the vacuum valve body 6, but if the vacuum pressure of the line 5 is low, the vacuum valve body 6 which has once started to open also has a spring before fully opening. The closing force of 4a prevails, and the vacuum valve 6 starts sucking sewage with the opening degree in the middle. As a result, there is a possibility that foreign matter such as sucked pebbles may block between the vacuum valve body and the body.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made in view of the fact that the vacuum valve valve starts sucking sewage while the valve is being opened halfway, and there is no risk of foreign matter blocking the space between the vacuum valve and the body. It is an object to provide a vacuum valve for suction.

[0013]

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a tip is disposed between a suction pipe disposed in a sewage basin and a vacuum system for transferring sewage by a vacuum suction force. It is arranged, and the suction pipe communicates with the vacuum system by opening,
It is a vacuum valve for sewage suction that is shut off by closing and opens when the valve body is separated from the opening provided in the body,
When the valve body contacts the opening, the valve body is closed, the opening power of the valve body is used as a vacuum suction force from a vacuum system, and the closing power is a built-in spring-powered vacuum valve for sewage suction. In addition to the provision of a body, a magnet is provided on the valve frame side to apply a suction force in the closing direction to the magnetic body, and the closing power of the valve body is added to the spring force to make the magnetic attraction force of the magnet.

According to a second aspect of the present invention, there is provided the sewage suction vacuum valve according to the first aspect, further comprising an attractive force adjusting means for adjusting a magnetic attractive force acting on the magnetic body of the magnet. Features.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a vacuum valve for sewage suction according to the present invention, and FIG. 1 (a) is a diagram showing a vacuum valve body;
FIG. 1B is a diagram showing the arrangement of the magnets in the magnet holder. The configuration of the vacuum valve control device used for controlling the sewage suction vacuum valve of the present invention is substantially the same as that of the above-described conventional control device, and a description thereof will be omitted.

The vacuum valve body 4 has a lower housing (valve frame) 4e, and a piston cup 4g, a spring 4a, and a diaphragm 4b are housed in the lower housing 4e.
The diaphragm 4b is in close contact with the piston cup 4g, and the piston cup 4g constantly presses the vacuum valve body 6 in a direction to push out the vacuum valve body 6 by the elastic force of the spring 4a. The rear end of the shaft 4i is fixed to the center of the piston cup 4g. A vacuum valve body 6 is fixed to the tip of the shaft 4i. The distal end of the vacuum valve 6 is in close contact with an opening provided in the body 7, and is normally pressed by the elastic force of the spring 4a to close the opening. That is, in this state, the present sewage suction vacuum valve is in a closed state.

Reference numeral 4d denotes a magnet holder, which is fixed to the lower housing 4e with screws. The magnet holder 4d is provided with an even number of magnets 4h on the magnetic circuit board 41, and the magnets 4h are arranged so that their polarities alternately become N poles and S poles, respectively. 4
f is a magnetic plate which cooperates with the shaft 4i, the vacuum valve 6 and the piston cup 4g. 4j is a sealing member for sealing between the lower housing 4e and the shaft 4i, and 4k is a bearing for supporting the sliding of the shaft 4i.

When the sewage suction vacuum valve is closed, that is, when the tip of the vacuum valve valve body 6 is in close contact with the opening of the body 7 and the space between the suction pipe 3 and the line 5 is shut off, the magnetic plate 4f is magnetized. Since the even number of magnets 4h are arranged so as to alternately have different polarities, the magnetic flux generated from one magnet 4h passes through the magnetic plate 4f and is adjacent to the other end of the holder 4d. Through the closed-loop magnetic circuit having a small reluctance attracted to the magnet 4h having the opposite polarity. Therefore, a closed-loop magnetic circuit is formed in a state where the sewage suction vacuum valve is closed, and the magnetic attraction force by the magnet 4h is in the strongest state.
When the tip of the vacuum valve 6 is separated from the opening of the body 7, the magnetic plate 4f is separated from the magnet holder 4d, the magnetic resistance of the magnetic circuit is rapidly increased, and the magnetic attraction by the magnet 4h is rapidly reduced. Become.

When the water level of the sewage tank 1 rises (see FIG. 3) and the pressure of the pressure sensor tube 2 rises in the sewage suction vacuum valve having the above configuration, the pressure passes through the pipe 33 and is passed through the control device 11. Is transmitted to the first room 17 in the inside. As a result, the second diaphragm 16 moves to the right by overcoming the elastic force of the spring 28 and the magnetic attraction force of the magnet 29 and pushes the shaft 14, so that the valve 13 closes the hole 30 communicating with the atmosphere. Then, a vacuum is applied from the line 5 through the pipe 35 to the fifth chamber 24.
And transmitted to the sixth chamber 25, and further transmitted to the piston chamber 4c of the vacuum valve body 4.

As a result, a vacuum suction force acts in the piston chamber 4c, overcoming the elastic force of the spring 4a and the magnetic suction force of the magnet 4h attached to the magnet holder 4d, so that the vacuum valve valve 6 opens the body 7 Separate from. Thereby, the sewage of the sewage tank 1 is sucked from the tip of the suction pipe 3 and flows to the line 5 through the opening of the body 7.

When the water level of the sewage water drops, and the lower end of the suction pipe 3 sucks air, the pressure difference between the pressure detection holes 9 and 10 disappears. The diaphragm 19 is pushed to the left, and the valve 13 is pushed to the left, closing the through hole 23 a of the partition 23. As a result, the atmosphere flows into the sixth chamber 25, and the air flows into the piston chamber 4c of the vacuum valve body 4 through the pipe 36, and the vacuum valve body 6 is resilient by the spring 4a and magnetically attracted by the magnet holder 4d. Returned by the force, the opening of the body 7 is closed, and the suction pipe 3 is disconnected from the line 5.

FIG. 2 is a view showing the vacuum valve closing force when the above-mentioned sewage suction vacuum valve is opened and closed. In the drawing, A is the vacuum valve closing force (the combined force of the resilient force of the spring 4a and the magnetic attraction force of the magnet 4h) when the sewage suction vacuum valve is fully closed, and B is the vacuum valve closing force when the vacuum valve is fully opened ( (Combined force of the spring force of the spring 4a and the magnetic attraction force of the magnet 4h). The solid line C indicates the resultant force of the resilience of the spring 4a and the magnet attraction force of the magnet 4h, the chain line D indicates the elastic force of the spring 4a, and the dashed line E indicates the magnetic attraction force of the magnet 4h.

As described above, the valve opening command is output from the control device 11, and the vacuum of the line 5 is transmitted to the piston chamber 4c, so that the vacuum valve valve body 6 is pulled up. Attraction force is applied, and this magnetic attraction force is rapidly reduced when the vacuum valve valve body 6 moves away from the opening of the body 7, so that when the vacuum valve opening force exceeds point A, the vacuum valve valve body 6 From the opening to almost full opening. That is, when the opening force of the vacuum valve exceeds A, the vacuum valve for sucking sewage is opened to almost full open.

Although not shown in the drawings, the sewage suction is performed so that the magnetic attraction force of the magnet 4h acting on the magnetic plate 4f can be adjusted with the vacuum valve 6 closing the opening of the body 7. By configuring so that the valve opening / closing characteristics of the vacuum valve can be adjusted, it is possible to correspond to the state of the vacuum sewage transfer system such as the degree of vacuum of the vacuum system. The adjustment of the magnetic attraction force of the magnet 4h acting on the magnetic plate 4f can be performed, for example, in a state where the magnetic plate 4f is in contact with the tip of the magnet holder 4d.
A method of adjusting the magnetic attraction force by adjusting the gap with f or returning the number of magnets can be considered.

[0025]

As described above, according to the present invention, a magnetic body is provided on the valve body side, and a magnet is provided on the valve frame body side to apply a suction force in the closing direction to the magnetic body, so that the closing power of the valve body is reduced. When the valve body is separated from the body opening, that is, when the vacuum valve is opened, the opening degree is close to the full opening, and the sucked foreign matter closes the space between the valve body and the body because the magnet is attracted by the magnet in addition to the spring force. An excellent effect of greatly reducing the risk of occurrence is obtained.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a configuration example of a sewage suction vacuum valve according to the present invention. FIG. 1 (a) is a view showing a vacuum valve main body, and FIG. 1 (b) is a layout view of magnets of a magnet holder.

FIG. 2 is a diagram showing a vacuum valve opening / closing force of the sewage suction vacuum valve according to the present invention when the valve is opened / closed.

FIG. 3 is a diagram showing a configuration example of a conventional vacuum valve control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewage water tank 2 Pressure sensor pipe 3 Suction pipe 4 Vacuum valve main body 5 Line 6 Vacuum valve valve body 7 Body 8 Simultaneous intake air pipe 9 Pressure detection hole 10 Pressure detection hole 11 Controller 12 Casing 13 Valve body 14 Shaft 15 Partition wall 16th 2 diaphragm 17 1st room 18 2nd room 19 1st diaphragm 20 3rd room 21 4th room 22 Partition wall 23 Partition wall 24 5th room 25 6th room 28 Spring 29 magnet 30 hole 31 pipe 32 pipe 33 pipe 34 hole 35 pipes 36 pipes

Claims (2)

[Claims] 1. A suction pipe having a tip disposed between a suction pipe disposed in a sewage basin and a vacuum system for transferring sewage by a vacuum suction force. The suction pipe communicates with the vacuum system when opened, and is closed when closed. It is a vacuum valve for sewage suction, and is opened when the valve body is separated from the opening provided in the body,
The valve body closes when the valve body contacts the opening, the opening power of the valve body is used as a vacuum suction force from the vacuum system, and the closing power is built in as a spring-powered sewage suction vacuum valve. In addition to providing a magnetic material, a magnet is provided on the valve frame side, on which a magnetic attraction force acts in the closing direction on the magnetic material,
A vacuum valve for sewage suction, wherein a closing power of the valve body is added to the spring force to make a magnetic attraction force of the magnet. 2. The vacuum valve for sewage suction according to claim 1, further comprising magnetic attraction force adjusting means for adjusting a magnetic attraction force acting on the magnetic body of the magnet.