JP2790408B2 - Gate valve for vacuum type liquid transport device - 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-type wastewater collecting apparatus,
The present invention relates to a vacuum liquid transport device such as a vacuum chemical liquid transport device.

[0002]

2. Description of the Related Art Sewage discharged from homes and the like is usually sent to a sewage treatment plant by gravity. However, such a natural flow type sewage collection system has a problem that the laying of sewer pipes is restricted by the topography and the state of the ground, and the pipes are easily clogged. For this reason, recently, a vacuum-type sewage collection system that forcibly conveys sewage discharged from each household using vacuum pressure has attracted attention.

In such a vacuum-type sewage collection system, a vacuum valve unit in which sewage discharged from each household is stored by natural flow, and a vacuum station in which sewage is collected from the vacuum valve unit through a vacuum pipe It is constituted by.

A vacuum valve unit is disclosed in, for example,
No. 503128. The vacuum valve unit disclosed in this publication includes a suction pipe having one end immersed in sewage in a sewage tank, a vacuum valve having a tubular communication portion connected to the other end of the suction pipe, further,
A vacuum exhaust pipe connected to the communication portion, and the vacuum exhaust pipe is connected to a vacuum pump arranged in a vacuum station via a vacuum pipe. The vacuum valve is configured to open and close the communication part by operating a valve body disposed in the tubular communication part. The vacuum exhaust pipe is
It is always in a vacuum state by a vacuum pump connected via a vacuum pipe. Then, when a predetermined amount of sewage is stored in the sewage tank, the valve body of the vacuum valve is opened by the differential pressure between the vacuum pressure inside the vacuum discharge pipe and the atmosphere, and the tubular communication portion is opened. . As a result, the vacuum discharge pipe and the suction pipe in a vacuum state are in communication with each other, and the sewage in the sewage tank is sucked into the vacuum discharge pipe by the vacuum pressure, and is conveyed to the vacuum station through the vacuum pipe.

In such a vacuum-type wastewater collecting apparatus, the wastewater collected by the plurality of vacuum-type wastewater collecting apparatuses is collected in one water collecting tank by a vacuum pipe connected to a vacuum discharge pipe. . The vacuum pipe is branched into a plurality of pieces and connected to a vacuum discharge pipe of another vacuum-type wastewater collecting apparatus. For this reason, each of the vacuum discharge pipes in each vacuum type wastewater collection device has a failure, replacement,
At the time of repair or the like, the vacuum state in the vacuum discharge pipe of another vacuum sewage collection apparatus is not affected, for example, as disclosed in Japanese Patent Application Laid-Open No. 3-24727, between the vacuum valve and the vacuum discharge pipe. A gate valve is installed at The gate valve closes between the vacuum discharge pipe and the vacuum valve when the vacuum valve does not operate. As a result, no vacuum is applied to the failed vacuum valve, and since there is no danger of air being introduced into the vacuum exhaust pipe,
The vacuum valve can be repaired or replaced without any adverse effect on other vacuum sewage collection devices.

The gate valve disclosed in Japanese Patent Laid-Open Publication No. Hei 3-24727 has a vertical pipe connected to a downstream side of a horizontal connecting portion provided with a vacuum valve.
A horizontal valve body slidable in the vertical direction is provided. A horizontal vacuum discharge pipe is connected to the lower end of the vertical pipe.

[0007]

In such a gate valve, a vertical pipe in a vertical state is used, and a vacuum discharge pipe is connected to the lower end of the vertical pipe. The evacuation tube is located below the equipped connection. For this reason, there is a problem that the attachment position of the vacuum discharge pipe is limited with respect to the sewage tank in which the sewage is stored. In addition, the inside of the sewage tank becomes narrow due to the vertical pipe disposed in the sewage tank, which may hinder the work of replacing the vacuum valve.

[0008] Instead of such a gate valve, a method of using a commercially available ball valve or the like as the gate valve has been considered. However, the sewage tank usually has a maximum inner diameter of 900 mm, whereas the vacuum valve has an outer diameter of 75 mm, and considering the piping in the sewage tank,
It is not easy to arrange a commercially available large volume ball valve or the like in a sewage tank. Further, since the internal structure of the ball valve or the like is complicated, there is a possibility that foreign matter in the flowing sewage is clogged inside.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to connect a communication portion provided with a vacuum valve and a vacuum discharge pipe in a coaxial state, and furthermore, to improve the inside of a sewage tank. Another object of the present invention is to provide a vacuum type liquid transport device having a compact gate valve which can be easily installed.

[0010]

According to the present invention, there is provided a gate valve for a vacuum type liquid transport apparatus, which comprises: a suction pipe for sucking a liquid stored in a tank; a vacuum discharge pipe having a vacuum inside; And a vacuum connection pipe connecting the communication section and the vacuum discharge pipe, and a vacuum valve driven by vacuum to open and close the communication section. A gate valve that is disposed in a communication state and a cutoff state therebetween, and has a through hole that establishes a communication state between the communication part and the vacuum discharge pipe, and the through hole is slid to form the communication part and A thin valve body that is disposed between a flat plate-shaped valve body that is detached from the vacuum discharge pipe and shuts off the valve body and the communication part and the vacuum discharge pipe, and that accommodates the valve body so that it can slide in an airtight state. With a box-shaped valve box It is characterized in having, by their above-described object is achieved.

[0011]

According to the gate valve of the vacuum type liquid transport device of the present invention, when the communication portion is in communication with the vacuum discharge pipe, the valve element provided therebetween is slid to form a through hole of the valve element. To the communication part and the vacuum exhaust pipe. In such a state, the vacuum valve becomes drivable by the vacuum acting on the vacuum discharge pipe, the communication part is opened by driving the vacuum valve, and the liquid in the tank is sucked into the suction pipe, Discharged through a vacuum discharge pipe.

When the vacuum valve fails, the valve body is slid with respect to the valve box so that the through hole of the valve body does not face the communication portion and the vacuum discharge pipe. As a result, the connection between the communication part and the vacuum discharge pipe is shut off, so that there is no danger of air entering into the vacuum discharge pipe in which the inside is in a vacuum state, and a vacuum acts on the communication part equipped with a vacuum valve. There is no danger.

The gate valve has a compact structure in which a flat valve body is slidably housed in a valve box, so that the gate valve can be easily mounted in a tank.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a vacuum-type wastewater collecting apparatus which is an example of the vacuum-type liquid transport apparatus of the present invention. The vacuum type sewage collection device 10 is provided for collecting sewage discharged from each home by gravity flow. The vacuum type sewage collection device 10 is provided with a predetermined amount of sewage collected in a sewage tank 11. As a result, the wastewater is supplied by vacuum to the water collection tank of a vacuum station provided with a vacuum pump or the like. The sewage sent to the collection tank is
The water is supplied from the collection tank to a sewage treatment plant by a pressure pump.

In the vacuum type sewage collecting apparatus 10, a sewage inflow pipe 12 into which sewage from each household flows in under natural flow is connected to a sewage tank 11. Inside the sewage tank 11, a suction pipe 13 for sucking sewage stored in the sewage tank 11 is disposed in a vertical direction. At the upper end of the suction pipe 13, one end of a tubular communication part 28 of the vacuum valve 15 which is in a horizontal state is connected by a pipe joint 71, and to the other end of the communication part 28,
The gate valve 50 is connected by a pipe joint 72. The horizontal vacuum discharge pipe 14 is connected to the gate valve 50 by a pipe joint 73.

In each of the pipe joints 71, 72, 73, a pipe portion to be connected is inserted into a tubular joint body made of an elastic material such as rubber, and the joint body is externally clamped with a metal band clamp. It is configured by tightening.

The gate valve 50 normally establishes communication between the communication part 28 and the vacuum discharge pipe 14. When the vacuum valve is damaged, repaired, replaced, or the like, the communication part 28 and the vacuum discharge valve 14 are used.
It is manually operated so as to close the gap.

A valve element 24 of the vacuum valve 15 is disposed inside the communication section 28, and the communication section 28 is opened and closed by the valve element 24 of the vacuum valve 15. Further, the vacuum discharge pipe 14 is connected to a vacuum pipe, and this vacuum pipe is connected to a vacuum pump arranged near the water collecting tank. The inside of the vacuum pipe is always in a vacuum state, and therefore, the inside of the vacuum discharge pipe 14 is also in a vacuum state. When the liquid level in the sewage tank 11 becomes equal to or more than a predetermined amount, the valve body 24 of the vacuum valve 15
Is driven to open the communication section 28, and the sewage in the sewage tank 11 is discharged from the sewage tank 11 through the suction pipe 13, the communication section 28 and the vacuum discharge pipe 14,
It is conveyed to a water collection tank by a vacuum pipe.

In the sewage tank 11, a liquid level detection pipe 37 whose lower end is immersed in sewage stored in the sewage tank 11 is disposed in a vertical direction. This liquid level detection pipe 3
7 is a vacuum valve control device 2 provided to the vacuum valve 15 by a flexible hose 38 (indicated by a two-dot chain line in FIG. 1).
7, and a pressure change based on a change in the liquid level in the sewage tank 11 is transmitted to the vacuum valve control device 27 of the vacuum valve 15. The vacuum valve control device 27 controls the vacuum state in the vacuum valve 15 based on the liquid level fluctuation of the sewage in the sewage 11 detected by the liquid level detection pipe 37.

Further, the inside of the vacuum discharge pipe 14 is connected to the vacuum valve control device 27 by a flexible hose 41. Therefore, the vacuum in the vacuum discharge pipe 14 makes the inside of the vacuum valve control device 27 vacuum. You. Further, a flexible hose 44 is connected to the vacuum valve control device 27 by a flexible hose 44.
The atmosphere communication pipe 43 communicates. This atmosphere communication pipe 43
Is open at the upper end to the atmospheric pressure on the ground surface, and the atmosphere introduced from the atmosphere communication pipe 43 is introduced into the inside of the vacuum valve control device 27 through the flexible hose 44. . The atmosphere communication pipe 43 is also connected to the inside of the vacuum valve 15 by a flexible hose 46.

A vent pipe 18 communicates with the sewage tank 11. The communication pipe 18 has a relatively large diameter, and the opening at the tip is arranged on the ground surface. When the vacuum valve 15 is driven and the sewage in the sewage tank 11 is sucked into the suction pipe 13 by a vacuum, the ventilation pipe 18 sucks a large amount of air into the sewage tank 11 and removes the sucked sewage. It is provided to carry as a gas-liquid multi-phase flow of air and sewage.

FIG. 2A shows the connecting portion 28 and the vacuum exhaust pipe 1.
FIG. 2 is a cross-sectional view of a gate valve 50 provided between
(B) is a longitudinal sectional view thereof. The gate valve 50 includes a valve box 51 disposed between the communication unit 28 and the vacuum exhaust pipe 14,
The valve body 51 has a flat plate-shaped valve body 52 which is slidably arranged in a vertical direction.

The valve box 51 is long in the vertical direction,
The vacuum discharge tube 14 has a hollow thin box shape having a short axial thickness, and has a half portion divided in the thickness direction. A flange portion 51a is provided around each half portion, and each flange portion 51a is abutted against each other, and each half portion is joined by a plurality of bolts 64.

At the center of each half of the valve box 51,
Cylindrical connecting pipe portions 61 and 62 each protruding outward are provided. One connecting pipe portion 61 is connected to the tubular connecting portion 28 concentrically by a pipe joint 72, and the other connecting pipe portion 62 is concentrically connected to the vacuum discharge pipe 14 by a pipe joint 73. It is supposed to be.

The valve body 52 housed in the valve case 51 has a thickness direction and a width direction dimension of the inner surface of the valve case 51 except that the length in the vertical direction is shorter than the inner peripheral surface of the valve case 51. The dimensions in the thickness direction and the width direction are almost the same.
Can be slid in the vertical direction along the inner peripheral surface of the. The valve box 51 is provided with a pair of seal rings 58 and 58 which are pressed against the respective surfaces of the valve body 52 in the thickness direction in an airtight state. Each seal ring 58 is installed in a concave groove arranged so as to surround the inner peripheral surface of each connection pipe part 61 and 62. The concave groove in which each seal ring 58 is installed has a shape such that each seal ring 58 is not sucked out even when the inside of the connection pipe portion 62 connected to the vacuum discharge pipe 14 is in a vacuum state, for example, bent into a hook shape. Is preferred.

A lower portion of the valve body 52 is provided with a through hole 59 having an inner diameter substantially equal to the inner diameter of each of the connection pipes 61 and 62 provided in the valve box 51. The valve body 52 is slid upward in the valve box 51 so that the through-hole 59 is opposed to the connection pipes 61 and 62 in an aligned state, and the connection pipes 61 and 62 are connected to the through-hole 59. Through the communication. Thereby, the communication part 28 connected to one connection pipe part 61 and the vacuum discharge pipe 14 connected to the other connection pipe part 62 are communicated. When the valve body 52 slides downward, the through hole 59 is set to a lower shut-off position that does not face each of the connection pipe portions 61 and 62, and the valve body 5
2 except for the through-hole 59, the connecting pipe portions 61 and 6
2. Thereby, each connection pipe part 61 and 6
2 is in a state of being shut off by the valve body 52.

At the upper end of the valve body 52, a lower end of a valve body drive shaft 53 extending vertically so as to penetrate the valve box 51 is attached. A central portion of a handle 56 that is orthogonal to the valve drive shaft 53 is connected to an upper end of the valve drive shaft 53. The valve body 52 is slid up and down in the valve box 51 by manually operating the handle 56 in the up and down direction.

The lower and upper portions of the valve body drive shaft 53 are provided with pin holes 54 and 55, respectively, which are orthogonal to the axis. When the valve body 52 is slid to the uppermost side in the valve box 51, the lower pin hole 54 comes close to the outer upper end surface of the valve box 51. In such a state, the through hole 5 of the valve body 52
9 is opposed to each of the connection pipe portions 61 and 62, and when the stop pin 57 is inserted into the pin hole 54, the stop pin 57 is locked on the upper end surface of the valve box 51, and the valve body 52 is closed. Is prevented from sliding downward.

The upper pin hole 55 is formed so that the valve body 52
When the inside is slid to the lowermost side, it comes close to the outer upper end surface of the valve box 51. In such a state, the through hole 59 of the valve body 52 blocks the connection pipe portions 61 and 62, and the stop pin 57 is inserted into the pin hole 54. To the upper end of the
The valve body 52 is prevented from sliding downward.

The vacuum-type wastewater collecting apparatus 10 having the above-described configuration is used.
Is as follows. In use, the handle 56 of the gate valve 50 is moved upward by manual operation,
The valve element 52 in the valve box 51 is slid upward. Then, a stop pin 57 is inserted into the lower pin hole 54 located above the valve box 51. As a result, the valve body 52 in the valve box 51 is positioned above the valve box 51, and the through hole 59 of the valve body 52 faces the connection pipes 61 and 62 in an aligned state. 61 and 62 are brought into a communicating state.

In such a state, the vacuum type wastewater collecting apparatus 10
Is driven, the amount of sewage in the sewage tank 11 increases, and when the pressure in the liquid level detection pipe 37 whose lower end is immersed in the sewage rises, the liquid level detection pipe 37 communicates with the hose 38 via a hose 38. The pressure inside the vacuum valve control device 27 increases, and the inside of the vacuum valve control device 27 that is in communication with the vacuum discharge pipe 14 is in communication with the inside of the valve operating chamber 25 of the vacuum valve 15,
The inside of the valve working chamber 25 is evacuated.

As a result, the valve element 24 of the vacuum valve 15 moves upward, and the communication portion 28 is opened. At this time, since the inside of the vacuum discharge pipe 14 is in a vacuum state, the communication portion 28 is evacuated through the through hole 59 of the gate valve 50, and further, the inside of the suction pipe 13 is also evacuated, so that the suction pipe 13 Sewage is sucked inside. The sewage sucked into the suction pipe 13 is sent from the connecting part 28 to the vacuum pipe through the vacuum discharge pipe 14 and is conveyed to the water collecting tank.

At this time, the through hole 5 in the gate valve 50
Since the seal ring 58 is pressed into contact with the periphery of the seal 9 so as to be in an airtight state, there is no possibility that sewage or the like enters the valve box 51.

As described above, when the sewage in the sewage tank 11 is discharged, the pressure in the liquid level detecting pipe 37 decreases.
As a result, the vacuum valve control device 27 supplies the atmosphere introduced through the atmosphere communication pipe 43 and the hose 44 to the valve working chamber 25 through the inside of the vacuum valve control device 27, and the inside of the valve working chamber 25 Eliminate the vacuum. This allows
The valve body 24 of the vacuum valve 15 descends, and the communication part 28 is closed.

During inspection, repair, replacement, etc. of the vacuum valve 15 during such operation, the gate valve 5
The lock pin 57 inserted into the lower pin hole 54 of the valve drive shaft 53 at 0 is pulled out, and the handle portion 56 is manually operated, whereby the valve body 52 in the valve box 51 is slid downward. You. Then, the stopper pin 57 is inserted into the upper pin hole 55. In such a state, the valve body 52 in the valve box 51 is disengaged from the state in which the through hole 59 provided in the lower part faces each of the connection pipe sections 61 and 62, and the valve body 52 is provided between the connection pipe sections 61 and 62. Cut off.

As a result, there is no possibility that the communication section 28 and the vacuum valve 15 will be in a vacuum state due to the vacuum state in the vacuum discharge pipe 14. In addition, each connection pipe portion 6 in the valve body 52
1 and 62, a seal ring 5
8 is press-contacted, there is no danger of air being introduced into the vacuum exhaust pipe 14, and the vacuum state in the vacuum exhaust pipe 14 and the vacuum pipe is not impaired. There is no risk that the operation of the type collection device will be impaired.

In such a state, the suction pipe 13
The pipe joint 71 connecting the communication pipe 28 and the communication section 28 of the vacuum valve 15 is slid toward the suction pipe 13 or the communication section 28, and the pipe joint 72 connecting the communication pipe 28 and the gate valve 50 is also connected to the gate valve 50. Alternatively, the entirety of the vacuum valve 15 is removed from the suction pipe 13 and the gate valve 50 by sliding to the communication portion 28 side. Then, inspection, repair, replacement, and the like of the vacuum valve 15 are performed.

In the above embodiment, the vacuum discharge pipe 14 is directly connected to the connection pipe section 62 of the valve box 51 of the gate valve 50. For example, the position at which the vacuum discharge pipe 14 is attached to the sewage tank 11 is set. If you want to change
As shown in FIG. 3, a connection pipe 63 bent at a right angle may be attached, and a vacuum discharge pipe may be connected to the connection pipe 63.

[0040]

As described above, the gate valve of the vacuum-type liquid transport device of the present invention has a compact structure, and the communication portion and the vacuum discharge pipe can be coaxially connected. It can be easily installed in the tank,
In addition, the vacuum pump can be easily attached and detached. Further, since the gate valve is compact, the degree of freedom of the connection position with the vacuum discharge pipe increases, and the mounting position of the vacuum discharge pipe to the tank can be easily changed. Further, the gate valve has a simple internal structure, and there is no risk of foreign matter or the like being clogged inside. Therefore, the vacuum liquid transport device can be used stably for a long period of time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a vacuum-type wastewater collecting device which is an example of a vacuum-type liquid transport device of the present invention.

FIG. 2A is a cross-sectional view showing an example of a gate valve used in the vacuum-type wastewater collecting apparatus, and FIG. 2B is a vertical cross-sectional view thereof.

FIG. 3 is a cross-sectional view showing another example of the gate valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vacuum-type sewage collection apparatus 11 Sewage tank 13 Suction pipe 14 Vacuum discharge pipe 15 Vacuum valve 28 Communication part 50 Partition valve 51 Valve box 52 Valve body 53 Valve body drive shaft 57 Stop pin 58 Seal ring 59 Through hole 61 Connection pipe part 62 Connection tube

Claims (1)

(57) [Claims] 1. A suction pipe for sucking a liquid stored in a tank, a vacuum discharge pipe whose inside is evacuated, a tubular connecting pipe connecting the suction pipe and the vacuum discharge pipe, and a connecting portion of the suction pipe A vacuum valve driven by a vacuum so as to open and close the vacuum valve, wherein the gate valve is disposed between the communication section and the vacuum discharge pipe so as to establish a communication state and a cutoff state therebetween. A plate having a through-hole for communicating between the communication part and the vacuum discharge pipe, and the through-hole being disengaged from the connection part and the vacuum discharge pipe by being slid so as to be in a cut-off state. And a thin box-shaped valve box that is disposed between the valve body and the communication portion and the vacuum discharge pipe, and accommodates the valve body so as to be slidable in an airtight state. Gate valve of transportation equipment.