JPH0711274B2 - Liquid discharge valve device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a liquid discharge valve device, and more particularly to a liquid discharge valve device having a pump function. For example, it is suitable to be used for discharging water or oil separated by a water separator or an oil separator or the like.

[Prior Art] This type of valve device has been conventionally often used in a fuel supply system of a diesel engine. Diesel engine fuel contains a relatively large amount of water compared to gasoline, etc., so if it is used as it is, rust may occur in the engine, or the performance of the lubricating oil in the sliding part may deteriorate, causing it to get stuck. There was a problem such as sticking. Therefore, conventionally, a water separation type fuel filter having a water separation function is used instead of the ordinary fuel filter, or a segmenter for separating water and coarse foreign matters by sedimentation is arranged in the preceding stage of the ordinary fuel filter. . Then, the separated water accumulated in the water separation type fuel filter or the segmenter was discharged before reaching the overflow level. In order to perform this discharge automatically and reliably, a drainage device that has conventionally used a solenoid valve and a level sensor, or in the case of forced discharge, a solenoid valve, a level sensor, a pump, and a control device that controls these operations The drainage system using was used. Especially, the drainage system using a pump has high reliability for drainage.

Based on the above background, the present inventors have already filed Japanese Patent Application No. 59-1648.
No. 84 (Japanese Patent Publication No. 6-33825), water separated by a fuel filter 2 of a fuel supply system including a fuel tank 1, a fuel filter 2, a fuel injection pump 3 and an injection nozzle 4 as shown in FIG. Has proposed a drain valve device that discharges the water by electrically operating the diaphragm device.

As shown in FIG. 5, the structure is such that a one-way valve 14, 15 is provided in a flow path through which discharged water flows, and a pump chamber 18 partitioned by the one-way valve 14, 15 and the flow path and a diaphragm 16 is provided. Is provided. And above the diaphragm 16 the stem 2
0, the valve body 19 is provided below, and the stem 20 is connected to the solenoid coil 2
The diaphragm 16 is moved up and down by intermittently energizing 3 and urging the spring 22, and the volume of the pump chamber 18 is changed to perform drainage.

[Problems to be solved by the invention]

However, in the above-mentioned configuration, the valve body 19 closes the valve body in the direction opposite to the direction in which the discharge water flows, so that the fuel supply system shown in FIG. When the hand pump 2a above the filter is operated, when the pressure inside the fuel filter becomes positive, the fuel enters the drainage device and pushes up the valve body 19 to be discharged to the outside of the drainage device. Became clear.

[Means for solving problems]

Therefore, in order to solve the above problems, the present invention provides
A liquid discharge valve device in which the valve body is arranged so that the direction in which the valve body is closed and the direction in which the liquid to be discharged flows coincides is adopted.

[Work]

According to the above-mentioned means, even if the upstream side of the valve body has a positive pressure, this pressure acts in the direction of pressing the valve body against the valve seat, so that the liquid can be reliably prevented from leaking.

〔The invention's effect〕

Therefore, according to the present invention, there is no problem that the liquid leaks even when pressure is applied from the upstream side of the liquid discharge valve device, and a more reliable discharge device can be provided.

〔Example〕

 The present invention will be described below based on embodiments shown in the drawings.

FIG. 2 shows a fuel tank 1, a water separation type fuel filter 2,
A fuel supply system of a diesel engine including an injection pump 3 and an injection nozzle 4 is shown. Fuel (F) is sent from a fuel tank 1 through a pipe, a filter 2 and an injection pump 3 to be injected from an injection nozzle 4. Part of the fuel is returned to the fuel tank 1 through the return pipe. The water separated from the fuel (F) collects at the bottom of the filter 2. In order to discharge the accumulated water before it overflows, the drain valve device 5 according to the first embodiment of the present invention is used. Drainage is performed through the drain port (D) formed at the bottom of the filter 2, the drain pipe 6, the flow path in the drain valve device 5, and the drain pipe 7.

Details of the drain valve device 5 of FIG. 2 are shown in FIG.
The main body 8 of the drainage valve device 5 is formed with two flow path portions 9 and 10 forming a flow path. Each flow path portion 9, 10 extends from the end of the body 8 towards the central recess and opens there. Union joints 11 and 12 are threadedly connected to both ends of the flow path. The inlet union joint 11 is connected to the drain pipe 6. Therefore, the flow path is the inlet side union joint 1
1, through the drain pipe 6 and the drain port (D) to communicate with the bottom of the filter 2. By screwing in the inlet side union joint 11, the filter mesh 13 and the first one-way valve 14 are fixed in the flow passage portion by utilizing the shoulder portion (SH) of the flow passage portion 9. As a matter of course, the first one-way valve 14 is arranged in such a direction that the drainage from the inlet side union joint 11 can freely pass therethrough, but the flow from the opposite direction does not pass, and the filter mesh 13 has the first one-way valve 14 Is disposed on the upstream side of. The outlet union joint 12 is connected to the drain pipe 7. The second one-way valve 15
The flow of drainage to the outlet side union fitting 12 is allowed to flow freely,
It is arranged so that the flow from the opposite direction does not pass through. Therefore, drainage can flow in the flow path from the inlet side union joint toward the outlet side union joint.

The central recess of the main body 8 is closed by a diaphragm 16, and the peripheral edge of the diaphragm 16 is fixed to the main body 8 by a casing 17. The diaphragm 16 and the bidirectional valves 14 and 15 define a pump chamber 18.

A fixing member 19a is screwed into one end of the stem 20 through the opening at the center of the diaphragm 16 so as to sandwich the diaphragm 16 between them. As a result, the diaphragm device 21 that moves integrally is formed. The diaphragm device 21 is provided with a restoring force of a spring 22 which is a bias device interposed between the spring seat 20a formed on the outer peripheral surface of the substantially central portion of the stem 20 and the central boss portion 17b of the partition portion 17a of the casing 17. It is biased upwards.

On the other hand, the valve body 19 is formed in a generally T-shaped cross section by an operating rod 19c having a threaded portion 19b whose one end is screw-connected to the fixing member 19a and a valve 19d provided at the other end of the operating rod. The operating rod 19c is configured to penetrate the communication port 8a that connects the flow passage 9 and the pump chamber 18, hold the valve 19d on the flow passage 9 side, and open / close the valve seat 8d from the flow passage upstream side. Valve 19d
A bulging portion 19e is formed over the entire circumference on the outer peripheral edge portion on the side of the valve seat 8d so that opening and closing can be reliably performed. For mounting the valve body 19, a sealing screw 8b is mounted on the lower surface of the main body 8 through a packing 8c in an opening having a size through which the valve 19d can be inserted.

Also, an annular solenoid coil 23 surrounding the stem 20 is used.
Is mounted on the casing 17. When the solenoid coil 23 is energized, it exerts an electromagnetic force having a magnitude and a direction capable of moving the stem 20, that is, the entire diaphragm device 21 downward in the figure against the displacement force of the spring 22. It has a capacity that can be generated. Therefore, when the solenoid coil 23 is energized, the valve body 19
Moves downward, the valve seat 8d opens, and the flow paths communicate with each other.

Next, the operation of the drain valve device 5 will be described.

First, when water accumulates at the bottom of the filter 2 to the overflow level, the level sensor 24 provided at the bottom detects this and sends a signal (S) to the amplifier 25. Level sensor 24
The signal (S) from is amplified by the amplifier 25 and sent to the oscillator 26 as a command (C). The oscillator 26 is an ON-OFF circuit that alternately repeats supply / stop of power to the solenoid coil 23 while receiving the command (C) from the amplifier 25 or for a predetermined time after receiving the first command (C). is there. As a result, the solenoid coil 23 is intermittently energized. The oscillator 26 is provided with a control device that changes the ON-OFF cycle and the operation time. These amps 2
5. The oscillator 26 and the control device act as a controller that controls the energization of the solenoid coil 23. The diaphragm device 21 alternately receives a biasing force (upward in the figure) by the spring 22 and a pushing down force (downward in the figure) by the electromagnetic force of the solenoid coil 23, and reciprocates. Diaphragm device 21
The diaphragm 16 is deformed by the reciprocating motion of, and the capacity of the pump chamber is also changed. This provides a pumping action. That is, when the solenoid coil is energized, the diaphragm device 21 is pushed downward against the biasing force of the spring. As a result, the capacity of the pump chamber is reduced, and at the same time, the valve 19d of the valve element 19 separates from the valve seat 8d. In this case, only the second one-way valve 15 opens and the second one-way valve 15,
The water is drained from the pump chamber 18 through the flow path portion 10, the outlet side union joint 12 and the drain pipe 7.

After that, when the energization of the solenoid coil is stopped, the diaphragm device 21 is returned to its original position by the spring 22, the capacity of the pump chamber 18 is increased, and the valve element 19 at the position shown in FIG. 19d sits on valve seat 8d. When the capacity of the pump chamber 18 increases, drainage from the bottom of the filter 2 is introduced into the pump chamber 18 through the water pipe 6, the inlet side union joint 11, the first one-way valve 14 and the flow passage portion 9. These operations are alternately repeated until drainage is completed. The judgment of the completion of drainage may be made by assuming that the drainage is completed after the operation is repeated for a certain period of time, or it may be completed when the level sensor having two high and low set levels shows a low level.

When the drainage is completed, the oscillator 26 stops the supply of electricity to the solenoid coil 23. Then, the diaphragm device 21 is biased upward by the spring 22 and the flow path remains blocked.

Then, after assembling at the time of vehicle production, after assembling at the time of modification, etc., the hand pump 2a provided on the upper portion of the fuel filter 2 is operated to fill the fuel supply system with fuel to operate the fuel filter 2
Even when the internal pressure becomes positive, the valve element 19 is closed so that the valve 19d contacts the valve seat 8d from the upstream side of the flow path toward the downstream side of the flow path, that is, the closing direction of the valve element 19 and the flow of fluid. Since the directions are the same, the positive pressure is applied to the valve 19d.
Even in such a case, it is possible to reliably prevent the problem that the fuel passes through the drain valve device and leaks from the drain pipe 7 to the outside.

By the way, in the first embodiment, the valve body 19 is connected and fixed to the stem 20 with the diaphragm 16 sandwiched by the fixing member 19a by screwing. Error occurs, the end face of the bulging portion 19e of the valve 19d and the end face of the valve seat 8d do not come into full contact with each other when the valve body 19 is closed, and one-sided sealing is performed. There may be cases where there are none.

Therefore, in the second embodiment of the present invention shown in FIG. 3, instead of the structure in which the fixing member 19a of the valve body 19 and the operating rod 19b are screwed and fixed, the operating rod 19b and the fixing member 19a are needle-shaped. The point portion 19f and the recessed portion 19g that receives the point portion 19f may be in contact with each other. In this case, the spring seat 20a formed on the outer peripheral surface of the substantially central portion of the stem 20 and the central boss portion of the partition portion 17a of the casing 17 in the first embodiment.
The spring coil 22 arranged between the valve 17d and 17b is abolished and fixed between the valve 19d and the sealing screw 8b at the bottom of the main body,
The structure is the same as that of the above-described embodiment except that the valve 19d is arranged to be pressed against the valve seat 8d.

With this configuration, even when the stem 20 and the valve 19d of the valve body 19 are not mounted vertically or the valve seat is tilted, the assembling processing errors are absorbed by the point portion 19f. Therefore, there is an excellent effect that the problem of poor sealing as described above is surely avoided.

FIG. 4 is a sectional view for explaining the structure of the third embodiment of the present invention. In this embodiment, the flow passage 9 on the upstream side of the pump chamber 18 is configured to flow from below the main body 8. , Valve body
19, the spring 22, and the one-way valve 14 are held by a holder 8e and fixed by an assembling holding plate 8f. With this structure, there is no need to provide another hole for assembling the valve body 19 as in the first and second embodiments, and at the same time, the oscillator 26 can be compactly housed on the side surface. .

Further, in the above-mentioned first to third embodiments, the diaphragm
The operation of 16 was performed by turning on / off the energization of the solenoid coil 23 and the reaction force of the spring 22 which is a bias device, but in addition to this, a pressure chamber is provided on the opposite side of the pump chamber 18, and this pressure The operation may be performed by changing the pressure in the chamber, or an operation method such as a piezoelectric actuator may be used.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view for explaining the structure of a drain valve device 5 of a first embodiment of the present invention, and FIG. 2 is a diesel engine for the drain valve device 5 of the first embodiment. 3 is a cross-sectional view for explaining the structure of another embodiment of the present invention, and FIG. 5 is a structure of a conventional drain valve device. It is sectional drawing explaining. 9,10 ...... Flow path part, 14,15 ...... One way valve, 16 ...... Diaphragm, 19 ...... Valve body, 20 ...... Stem, 22 ...... Spring, 23 ......
Solenoid coil.

Claims (2)

[Claims] 1. A flow path, one end of which communicates with a discharged liquid storage portion that stores a liquid to be discharged, and a flow path that allows the discharged liquid to flow from one end to the other end of the flow path. Two one-way valves arranged in series in the passage, and a volume of the pump chamber that is provided in the flow passage between the two one-way valves, defines a pump chamber, and is reciprocally driven. And a diaphragm for increasing or decreasing the pressure and a flow path provided between the two one-way valves to open and close the flow path in response to the diaphragm, and close the flow path when the diaphragm is in an inoperative state. A liquid discharge valve device comprising: a valve body arranged so that its closing direction and the flowing direction of the liquid to be discharged coincide with each other. 2. The pump chamber (18) and the flow path portion (9) upstream of the pump chamber (18) communicate with each other through a communication port (8a),
A valve seat (8d) is provided around the communication port, and the valve body (1
9) is an operating rod (19c) which is provided so as to pass through the communication port and has one end connected to interlock with the diaphragm,
The valve (19d) which is provided on the other end side of the operating rod and is located on the upstream side of the communication port to open and close the valve seat is included. Liquid discharge valve device.