JP2003278939A - Pressure chamber type diaphragm valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that a water draining mechanism of a pressure chamber and a general flow control mechanism are separated in a conventional pressure chamber type diaphragm valve, and water in the pressure chamber must be drained manually. <P>SOLUTION: In the pressure chamber type diaphragm valve which comprises a diaphragm valve disposed between the primary side and the secondary side of a flow passage, and a pressure chamber which communicates with the primary side through a bleed hole formed in the diaphragm valve and communicating with the secondary side through a pilot hole, and opens/closes the flow passage by utilizing the differential pressure between the primary side and the secondary side of the flow passage by opening/closing the pilot hole, a drive rod to open/close the pilot hole and directly drive the diaphragm valve is provided, and a water pressure drive mode of the diaphragm valve by opening/closing the pilot hole and a forced drive mode to communicate the primary side with the secondary side of the flow passage by directly driving the diaphragm valve are provided in one mechanism. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure chamber type diaphragm valve.

[0002]

2. Description of the Related Art A conventional water drain plug system, for example, as disclosed in Japanese Patent Laid-Open No. 8-284224, uses a water drain plug based on a signal from a temperature sensor for detecting the temperature around the water supply pipe or the water temperature in the water supply pipe. The water in the water supply pipe was drained to prevent freezing damage of the water supply pipe. A conventional pressure chamber type solenoid valve used in cold regions is disclosed in, for example, Japanese Patent Laid-Open No. 2000-26.
The pressure chamber was drained manually as disclosed in 6196.

[0003]

However, the pressure chamber type diaphragm valve disposed on the secondary side of the conventional drain plug has a structure in which the valve is opened by utilizing the differential pressure between the primary pressure and the secondary pressure. Therefore, the valve cannot be opened in a situation where a differential pressure does not occur, such as when draining the water supply pipe, and therefore air exchange is not performed, so the water supply pipe cannot be drained sufficiently and freeze damage occurs. There was a problem of doing it. Further, in the above state, water in the pressure chamber of the pressure chamber type diaphragm valve does not escape, so that there is a problem that the pressure chamber type diaphragm valve is also freeze-damaged.

The present invention has been made to solve the above problems, and an object of the present invention is to construct a normal flow rate control by opening and closing a pressure chamber type diaphragm valve and a water draining mechanism of the pressure chamber by one mechanism. However, by interlocking the water draining operation of the water draining plug with the primary side of the flow path, the pressure chamber diaphragm that reliably drains the water inside the water supply pipe and the pressure chamber of the pressure chamber diaphragm valve and does not freeze or break To provide a valve.

[0005]

In order to achieve the above object, the first aspect of the present invention is to provide a diaphragm valve provided between a primary side and a secondary side of a flow passage, and a bleed hole provided in the diaphragm valve. A pressure chamber communicating with the primary side through the pilot hole and the secondary side through the pilot hole, and by opening and closing the pilot hole, the flow path is formed by utilizing the differential pressure between the primary side and the secondary side of the flow path. In the pressure chamber type diaphragm valve that opens and closes,
It has a drive rod that opens and closes the pilot hole and directly drives the diaphragm valve, and connects the primary side and the secondary side of the flow path by directly driving the diaphragm valve and the hydraulic drive mode by opening and closing the pilot hole of the diaphragm valve. It is configured to provide the forced drive mode. Therefore, when the flow rate is controlled normally, the pilot hole is opened and closed, but when draining water to prevent freezing, the flow path is maintained and the primary side and the secondary side are open to the atmosphere and no differential pressure is generated. When the water is drained from the water supply pipe by transmitting it directly to the rod, air exchange can be performed without the diaphragm valve blocking the flow path, so the water in the water supply pipe and in the pressure chamber of the pressure chamber type diaphragm valve is reliably drained. It is possible to provide a pressure chamber type diaphragm valve capable of reliably preventing freezing damage.

To achieve the above object, a second aspect of the present invention is the pressure chamber diaphragm valve according to the first aspect, in which the drive rod has a diameter larger than the diameter of the pilot hole and smaller than the diameter of the pilot hole in the first protrusion. A second protrusion having a diameter is provided. Since the protrusions with different diameters are coaxially configured, when driven in the vertical direction, the pilot hole can be opened and closed in the small diameter part of the tip part, and the diaphragm valve itself can be driven in the large diameter part. Since the hydraulic drive mode and the forced drive mode can be realized only by changing the movement amount of the drive rod,
It is possible to provide a pressure chamber type diaphragm valve that can reliably drain water in the water supply pipe and the pressure chamber of the pressure chamber type diaphragm valve with a simple configuration and can reliably prevent freezing damage.

According to a third aspect of the present invention, in the pressure chamber diaphragm valve according to the second aspect, a drain port is provided on the secondary side of the flow path, and the drive rod has the drain port and the pilot hole. A water supply pipe seal member that penetrates through and is slidably movable in the vertical direction to seal the drain port integrally with the drive rod; a valve seat packing that seals the pilot hole integrally with the drive rod; And a biasing member that biases the rod toward the diaphragm valve, and the drain port and the pilot hole are arranged on a substantially vertical line. As a result, the water in the pressure chamber in which the drain port and the pilot hole are arranged on a substantially vertical line can be configured as a discharge port to the outside of the pressure chamber type diaphragm valve only by adding a sealing member to the drive rod, It is possible to drive the hydraulic drive mode and the forced drive mode with one actuator, and it is possible to provide a pressure chamber type diaphragm valve that can reliably prevent freezing damage with a simple configuration.

According to a fourth aspect of the present invention, in the pressure chamber diaphragm valve according to the third aspect, the drive rod having teeth formed in the axial direction is perpendicular to the drive rod and the rotation axis. The drive rod is configured to be driven in the vertical direction by the motor thus arranged and a gear provided at the tip of the rotary shaft of the motor and formed to mesh with the teeth integrally. Since the drive motor can be arranged on the side in the vertical drive direction, the electromagnetic actuator does not need to be waterproof, and if the bottom of the drive rod is directly rotated in the circumferential direction, the manual mechanism can be easily used together in an emergency.

To achieve the above object, a fifth aspect of the present invention is the pressure chamber diaphragm valve according to the third to fourth aspects, wherein the drive region of the drive rod is a region where the pilot hole is open and the drain port is closed. It is configured to have at least two drive regions, which are regions where the pilot hole and the drain port are simultaneously opened. Therefore, it is possible to provide the pressure chamber type diaphragm valve capable of selectively using the two functions of the hydraulic drive mode and the forced drive mode with one valve by opening / closing the pilot hole and closing the drain port.

In order to achieve the above object, a sixth aspect of the present invention is the pressure chamber type diaphragm valve according to the first to fifth aspects, wherein the pressure is set in the primary side of the flow passage and the water pressure is measured to measure the atmospheric pressure of the primary side flow passage. It has a water pressure detecting means for detecting opening, and a control means for controlling the drive rod and the water pressure detecting means, and the control means is configured to operate in the forced drive mode according to the output of the water pressure detecting means. . Therefore, the water pressure detecting means detects the open state of the atmosphere in the water supply pipe by the water drain plug arranged on the primary side of the flow passage, and in conjunction with this, drives the pressure chamber type diaphragm valve in the forced drive mode to Can drain water reliably.

In order to achieve the above object, a seventh aspect of the present invention is the pressure chamber diaphragm valve according to the first to sixth aspects, in which the temperature detecting means for detecting the water temperature on the primary side of the flow path and the main water supply pipe are used. A water drain plug for stopping water supply to the primary side of the flow channel and draining water in the flow channel; and a control unit for controlling the drive rod, the temperature detecting unit, and the water drain plug,
The control means is configured to operate in the forced drive mode according to the output of the temperature detection means. As a result, before the water in the water supply pipe freezes automatically by detecting the water temperature, the water drain plug is driven and the pressure chamber type diaphragm valve forced drive mode is reliably performed to prevent freezing damage. A pressure chamber type diaphragm valve capable of being provided can be provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In order to make the contents of the present invention easier to understand, description will be given below based on the embodiments shown in the drawings. Figure 1
Is a configuration diagram of the pressure chamber type diaphragm valve and the water drain plug system of the present invention, FIG. 2 is a diagram showing a closed state of the pressure chamber type diaphragm valve of the present invention configured by a motor and a rack and pinion mechanism, and FIG. 3 is the same pressure. FIG. 4 is a diagram showing a state in which the chamber type diaphragm valve is opened in the hydraulic drive mode, and FIG. 4 is a diagram showing a state in which the pressure chamber type diaphragm valve is driven in the forced drive mode.

First, an electromagnetic valve of the pressure chamber type diaphragm valve 1 of the present invention will be described as an example.

In FIG. 1, water is drawn from the water supply pipe 3 branched from the mains 2 of the water supply into the water supply pipe 3 inside the house through the electric water drain plug 4 having a water stop function. The chamber diaphragm valve 1 is closed, and no water is flowing on its secondary side. Here, when a signal is input to the control means 6 from the human body detecting means 5 or a manual switch (not shown), the control means 6 drives the pressure chamber diaphragm valve 1 to open and discharge water. On the contrary, the human body detection means 5
Or when the signal is not input from the manual switch etc.,
The control means 6 closes the pressure chamber diaphragm valve 1 to stop the water.

When the water pressure detecting means 7 is provided on the primary side of the pressure chamber type diaphragm valve 1, the water draining plug 4 serves to prevent the water supply pipe 3 from freezing and damage. When the water in the water supply pipe 3 is cut off and the water in the water supply pipe 3 is being drained, the control means 6 interlocks with this by detecting a decrease in the water pressure close to the atmospheric pressure. The diaphragm valve 1 is driven in the forced drive mode to perform air exchange so that the water supply pipe 3 can be reliably drained, and the water in the pressure chamber of the pressure chamber type diaphragm valve can also be reliably drained.

If a water temperature detecting means 8 is arranged on the primary side of the pressure chamber type diaphragm valve 1, the water supply pipe 3
When the control means 6 cuts off the water supply from the main pipe 2 to the water draining plug 4 to drain the water in the water supply pipe 3 while sensing that the water temperature in the water is about to be frozen, The type diaphragm valve 1 is driven in the forced drive mode to perform air exchange so that the water supply pipe 3 can be reliably drained, and the water in the pressure chamber of the pressure chamber type diaphragm valve can also be reliably drained.

Next, the hydraulic drive mode will be described with reference to an embodiment in which the pressure chamber type diaphragm valve 1 is composed of a motor and a rack and pinion mechanism.

FIG. 2 is a detailed view of the pressure chamber type diaphragm valve 1 of FIG. Water flows in from the inflow port 9 of the pressure chamber type diaphragm valve 1 and flows out from the outflow port 10, but the control means 6
When there is no valve open signal from the diaphragm receiver 11
Since the diaphragm valve 13 constituted by the diaphragm 12 which is substantially integrated with the main seat 14 seals the main seat 14, water does not flow. This is because the pressure × pressure receiving area of the pressure chamber 16 communicating with the primary side through the bleed hole 15 provided in the diaphragm receiver 11 is larger than the pressure × pressure receiving area on the secondary side. Here, when the valve opening output signal is issued from the control means 6 to the motor 17, the valve seat packing 19 provided substantially integrally with the drive rod 18 near the end of the drive rod 18 by the rack and pinion mechanism.
However, by moving the drive rod 18 in the direction away from the pilot hole 20 provided at the substantial center of the diaphragm receiver 11, the pressure chamber 16 and the secondary side communicate with each other through the pilot hole 20, and the pressure in the pressure chamber 16 drops at a dash. To do. Then,
The pressure balance changes across the diaphragm valve 13, the diaphragm valve 13 moves in a direction away from the main seat 14, the primary side and the secondary side communicate with each other, and water begins to flow as shown in FIG.

Next, when a valve closing signal is output from the control means 6 to the motor 17, the drive rod 18 moves in the direction opposite to that when the valve is opened.
The valve seat packing 19 closes the pilot hole 20 by the urging force of the urging member 21 that urges in the direction of pressing it toward 0. As a result, the communication between the pressure chamber 16 and the secondary side is cut off, and the pressure in the pressure chamber 16 rises, so that the pressure balance changes across the diaphragm valve 13, and the diaphragm valve 13 moves in the direction to close the main seat 14. As a result, the primary side and the secondary side are shut off and the state returns to the water stop state as shown in FIG.

Next, the forced drive mode of the pressure chamber type diaphragm valve 1 in the above embodiment will be described.

In the first stage of the forced drive mode, as in the hydraulic drive mode, the valve opening signal is output from the control means 6 to the motor 17 and the valve open state shown in FIG. 3 is reached. Further, as the second stage, the drive of the motor 17 continues, and the enlarged diameter portion 22 larger than the pilot hole 20 of the drive rod 18 is moved to the diaphragm valve 13
Push up. At this time, the water supply pipe seal member 23 is attached to the drainage port 2
Since it moves from the end face of 4 to the inside of the water supply pipe and is not sealed, the air in the water supply pipe is drained and the water in the pressure chamber 16 is also drained, as shown in FIG. As a result, the water in the water supply pipe 3 and the pressure chamber 16 is reliably drained, so that the pressure chamber type diaphragm valve 1 is not frozen and damaged.

To release the forced drive mode, the control means 6 causes the motor 17 to rotate in the reverse direction, and the process reverse to the above is followed to return to the valve closed state of FIG.

As described above, the diaphragm valve provided between the primary side and the secondary side of the flow path, and the bleed hole provided in the diaphragm valve communicates with the primary side and the secondary through the pilot hole. And a pressure chamber communicating with the side,
In a pressure chamber type diaphragm valve that opens and closes the flow path by using the differential pressure between the primary side and the secondary side of the flow path by opening and closing the pilot hole, opening and closing the pilot hole and directly driving the diaphragm valve Since it is configured to have a drive rod for performing the operation, a hydraulic drive mode by opening and closing the pilot hole of the diaphragm valve and a forced drive mode for directly driving the diaphragm valve to communicate with the primary side and the secondary side of the flow passage are provided. Since air can be exchanged without blocking the flow path by the diaphragm valve when the pipe is drained, water in the water supply pipe and the pressure chamber of the pressure chamber type diaphragm valve can be reliably drained.

Further, since the drive rod is constructed such that the first protrusion having a diameter larger than the pilot hole is provided with the second protrusion having a diameter smaller than the diameter of the pilot hole, the hydraulic drive mode and the Since the forced drive mode can be realized only by changing the movement amount of the drive rod, the configuration can be greatly simplified.

Further, the drainage port is provided on the secondary side of the flow path, and the drive rod penetrates the drainage port and the pilot hole and is slidably movable in the vertical direction. A water supply pipe sealing member for sealing, and a valve seat packing for sealing the pilot hole integrally with the drive rod,
Since the drive rod is configured to include a biasing member that biases the diaphragm valve, and the drain hole and the pilot hole are arranged on a substantially vertical line, one actuator is used for the hydraulic drive mode and the forced drive mode. It can be driven.

Further, a drive rod having teeth formed in the axial direction, a motor arranged so that the drive rod and the rotation axis are at a right angle, and an integral unit with the teeth provided at the tip of the rotation shaft of the motor. Since the drive rod is configured to be driven in the vertical direction by the gear formed to mesh with,
There is no need to waterproof the electromagnetic actuator.

Further, since the driving region of the driving rod has at least two driving regions, that is, a region where the pilot hole is opened and the drain port is closed, and a region where the pilot hole and the drain port are simultaneously opened, one driving region is provided. With the valve, it is possible to selectively use the two functions of the hydraulic drive mode and the forced drive mode.

Further, there is provided a water pressure detecting means which is installed on the primary side of the flow path and measures the water pressure to detect the opening of the flow path on the primary side to the atmosphere, and a control means which controls the drive rod and the water pressure detecting means. However, since the control means is configured to operate in the forced drive mode according to the output of the water pressure detection means, the drain plug provided on the primary side of the flow path is opened to drain the water in the water supply pipe. The pressure chamber type diaphragm valve can be driven in the forced drive mode in conjunction with this when the condition is reached, and freezing damage can be reliably prevented.

Further, a temperature detecting means for detecting the water temperature on the primary side of the flow path, a water drain plug for stopping the water supply from the water supply main to the primary side of the flow path, and draining the water in the flow path, and the drive. It has a rod, the temperature detection means, and a control means for controlling the water drain plug, and the control means is configured to operate in the forced drive mode according to the output of the temperature detection means, so that the water temperature decreases. Then, before the water in the water supply pipe is frozen, the drive of the water drain plug and the forced drive mode of the pressure chamber type diaphragm valve are surely performed, and the freezing damage can be surely prevented.

[0030]

According to the present invention, the water supply pipe and the pressure chamber of the pressure chamber type diaphragm valve can be reliably drained with a simple structure, and freezing damage can be reliably prevented.

[0031]

[Brief description of drawings]

FIG. 1 is a configuration diagram of a pressure chamber diaphragm valve and a water drain plug system of the present invention.

FIG. 2 is a diagram showing a closed state of the pressure chamber diaphragm valve of the present invention constituted by a motor and a rack and pinion mechanism.

FIG. 3 is a state diagram in which the pressure chamber type diaphragm valve of FIG. 2 is opened in a hydraulic drive mode.

FIG. 4 is a state diagram in which the pressure chamber diaphragm valve of FIG. 2 is driven in a forced drive mode.

[Explanation of symbols]

1 ... Pressure chamber type diaphragm valve, 2 ... Main pipe, 3 ... Water supply pipe,
4 ... Water drain plug, 5 ... Human body detection means, 6 ... Control means, 7 ...
Water pressure detecting means, 8 ... Water temperature detecting means, 9 ... Inlet, 10 ...
Outflow port, 11 ... Diaphragm receiver, 12 ... Diaphragm, 13 ... Diaphragm valve, 14 ... Main seat,
15 ... Bleed hole, 16 ... Pressure chamber, 17 ... Motor, 1
8 ... Drive rod, 19 ... Valve seat packing, 20 ... Pilot hole, 21 ... Biasing member, 22 ... Expanded part, 23 ... Water supply pipe sealing member, 24 ... Drainage port

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Taisuke Taisuke             2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City, Fukuoka Prefecture             No. Totoki Equipment Co., Ltd. (72) Inventor Nobunaga Matsufuji             2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City, Fukuoka Prefecture             No. Totoki Equipment Co., Ltd. F-term (reference) 3H056 AA07 BB32 BB39 CA08 CB03                       CC11 CD01 CD06 CE01 CE05                       DD05 EE10 GG05                 3H062 AA02 AA12 BB19 BB30 CC01                       EE06 FF19 HH03 HH07

Claims (7)

[Claims] Claim: What is claimed is: 1. A diaphragm valve provided between a primary side and a secondary side of a flow passage, and a pressure communicated with the primary side through a bleed hole provided in the diaphragm valve and a secondary side through a pilot hole. In a pressure chamber type diaphragm valve having a chamber and opening and closing the flow path by using the differential pressure between the primary side and the secondary side of the flow path by opening and closing the pilot hole,
It has a drive rod that opens and closes the pilot hole and directly drives the diaphragm valve, and connects the primary side and the secondary side of the flow path by directly driving the diaphragm valve and the hydraulic drive mode by opening and closing the pilot hole of the diaphragm valve. A pressure chamber type diaphragm valve characterized by being provided with a forced drive mode. 2. The pressure chamber diaphragm valve according to claim 1, wherein the drive rod has a second protrusion having a diameter smaller than a diameter of the pilot hole on a first protrusion larger than a diameter of the pilot hole. A pressure chamber type diaphragm valve characterized in that a protrusion is provided. 3. The pressure chamber diaphragm valve according to claim 2, wherein a drain port is provided on the secondary side of the flow path, and the drive rod penetrates the drain port and the pilot hole and slides vertically. Water supply pipe seal member that movably operates and seals the drain port integrally with the drive rod, a valve seat packing that integrally seals the pilot hole with the drive rod, and urges the drive rod to the diaphragm valve. A pressure chamber diaphragm valve, wherein the drain port and the pilot hole are arranged on a substantially vertical line. 4. The pressure chamber diaphragm valve according to claim 3, wherein a drive rod having teeth formed in the axial direction, a motor arranged so that the drive rod and the rotation axis are at a right angle, and the motor. A pressure chamber diaphragm valve characterized in that the drive rod is driven in the vertical direction by a gear that is provided at the tip of the rotary shaft and is formed so as to mesh with the teeth integrally. 5. The pressure chamber diaphragm valve according to claim 3, wherein the drive region of the drive rod is a region in which the pilot hole is open and the drain port is closed, and a region in which the pilot hole and the drain port are simultaneously opened. A pressure-chamber diaphragm valve having at least two drive regions. 6. The pressure-chamber diaphragm valve according to claim 1, further comprising: a water pressure detection unit that is installed on the primary side of the flow path and measures water pressure to detect the atmospheric opening of the flow path on the primary side. A pressure chamber diaphragm valve comprising a drive rod and control means for controlling the water pressure detection means, wherein the control means operates in a forced drive mode in accordance with the output of the water pressure detection means. 7. The pressure chamber diaphragm valve according to claim 1, wherein the temperature detecting means for detecting the water temperature on the primary side of the flow passage and the water supply from the water supply main to the primary side of the flow passage are stopped. It has a water drain plug for draining the water in the flow path, a control means for controlling the drive rod, the temperature detecting means, and the water drain plug, and the control means responds to the output of the temperature detecting means. , A pressure chamber type diaphragm valve which operates in a forced drive mode.