JPH063271B2 - Two-stage switching type liquid level adjustment valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is designed to increase or decrease the liquid level of a liquid tank provided on the secondary side downstream.
The present invention relates to a two-stage switching type liquid level adjusting valve that adjusts in stages.

[Conventional technology]

Conventionally, there is known a pressure control valve that automatically switches the water supply pressure of waterworks or the like between two stages, high and low, according to the amount of use on the downstream side (Japanese Patent Publication No. 56-27893, 59-2988).
No. 7, Japanese Utility Model Publication No. 61-55711). These are for adjusting the opening degree of the main valve body by utilizing the differential pressure between the pressure on the primary side and the pressure on the secondary side, and introducing the fluid on the primary side into the pressure chamber and A combination of a pilot valve that is connected to the secondary side and is set to high and low two-stage pressure and a switching valve that opens and closes according to the opening degree of the main valve body, changes in usage, that is, the secondary side. The opening degree of the main valve element was adjusted to two levels, high and low, according to the change in pressure.

[Problems to be solved by the invention]

However, in equipment that has a liquid tank on the secondary side, that is, on the downstream side of the valve, the pressure on the secondary side is the pressure due to the liquid level in the liquid tank, so the pressure change is small and it was not possible to cope with it as it was. . Also, with a liquid level adjustment valve that constantly maintains a constant liquid level in the liquid tank, the retention time of the fluid in the liquid tank may become long and the fluid may be deteriorated if the amount discharged from the liquid tank is small. It was

Therefore, an object of the present invention is to provide a two-stage switching type liquid level adjusting valve capable of adjusting the liquid level of a liquid tank provided on the secondary side of the valve to two levels, high and low, according to the amount of fluid discharged.

[Means for solving problems]

That is, the present invention includes a main valve body that opens and closes the valve opening of the main valve, and a pressure chamber into which a fluid on the primary side of the main valve is introduced, and a predetermined amount of the fluid in the pressure chamber is derived by a pilot pipe. By changing the pressure of the pressure chamber, the opening of the main valve body is changed to adjust the flow rate of the main valve, and the liquid level of the liquid tank provided downstream of the main valve is adjusted from the liquid tank. A two-stage switching type liquid level adjusting valve that adjusts to high and low two stages according to the amount of discharge, which is a low liquid level that opens and closes at predetermined positions of low liquid level and high liquid level in the liquid tank by a change in liquid level. Side pilot valve and high liquid level side pilot valve are respectively arranged, the pressure chamber and the low liquid level side pilot valve are connected by the low liquid level side pilot piping, and the pressure chamber and the high liquid level side pilot valve are connected. A high-level side pilot pipe provided with a switching valve that opens according to the opening degree of the main valve. .

[Action]

By configuring as described above, the amount discharged from the liquid tank,
That is, it is possible to switch the liquid level in the liquid tank to a low level when the amount of fluid used on the downstream side is small, and to switch the liquid level to a high level when the amount to be discharged is large.

〔Example〕

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

The two-stage switching type liquid level adjusting valve 2 arranged on the upstream side of the liquid tank 1 provided in the water supply pipe line of the water supply includes a main valve 3 and the main valve 3
It is composed of a control part that controls opening and closing of the main valve 3
The interior of the valve box 4 is divided into a primary side valve chamber 6 and a secondary side valve chamber 7 by a partition wall 5, and the primary side valve chamber 6 and the secondary side valve chamber 7 are connected to the partition wall 5. A valve opening 8 is provided, and a main valve body 9 is fitted in the valve opening 8 so as to be vertically slidable.

Further, a diaphragm 11 defining a pressure chamber 10 for opening and closing the main valve 9 is provided on the upper portion of the valve box 4, and the diaphragm 11 is sandwiched between the main valve body 9 and the diaphragm retainer 12. is doing. A valve shaft 15 for opening the valve body 14 of the switching valve 13 is planted in the center of the upper surface of the diaphragm retainer 12. The valve shaft 15 is held by a valve bearing 16 provided on the upper portion of the valve box 4 so as to be movable in the vertical direction, and is formed in a conical shape having a smaller diameter on the lower side. A slight gap is formed between them.

In the switching valve 13, a guide cylinder 18 that is vertically movable and has a fluid passage hole 18a is fitted in a valve box 17, and an upper portion is provided by a valve body 14 provided at a lower end portion of the guide cylinder 18. A valve chamber 19 and a lower valve chamber 20 are defined. The valve body 14 is opened at the upper end of the valve shaft 15 by opening the main valve body 9 and raising the valve shaft 15 to open the valve, thereby connecting the upper valve chamber 19 and the lower valve chamber 20 to each other. Valve closing
This is performed by the weight of the valve body 14 and the pressure of the fluid introduced into the upper valve chamber 19. Further, the distance between the valve shaft 15 and the valve body 14 can be adjusted by moving the guide cylinder 18 up and down by the adjusting rod 21, and the opening degree of the main valve body 9 and the timing at which the valve body 14 of the switching valve 13 opens. It can be adjusted.

On the other hand, the liquid tank 1 is provided with an inlet 22 communicating with the secondary valve chamber 7 of the main valve 3 on one side and an outlet 23 communicating with the facility for using the fluid on the other side. Further, at a predetermined position in the liquid tank 1, a low liquid level side pilot valve 24 and a high liquid level side pilot valve 25 are provided at a predetermined position of a low liquid level and a high liquid level, respectively.

For both pilot valves 24 and 25, needle valve type ball taps as shown in FIG. 2 are used. That is, in both pilot valves 24 and 25, the tip end portion of the valve body 27 that contacts and separates from the valve seat 26 is formed into a conical shape, and the valve shaft 28 of the valve body 27 is screwed into the valve bearing 29 to allow the float 30 to move. The vertical movement is converted into the rotation of the valve shaft 28 to move the valve shaft 28 forward and backward to open and close. Accordingly, by appropriately setting the angle of the conical surface at the tip of the valve body 27 or the lead of the screw between the valve shaft 28 and the valve bearing 29, the vertical movement of the float 30, that is, the change in the liquid level is responded. The valve opening can be obtained. Furthermore, the fine vertical movement of the float 30 causes the valve body 2 to move.
Since it does not directly act on 7, it is possible to perform stable operation without causing hunting or the like.

The primary valve chamber 6 and the pressure chamber 10 of the main valve 3 have a bypass pipe 32 having a strainer 31 disposed therebetween and the valve box 4
The upper valve bearing 16 and the valve shaft 15 communicate with each other through a gap, and the pressure chamber 10 and the low liquid level side pilot valve 24 are connected by a low liquid level side pilot pipe 33. Further, the pressure chamber 10 and the high liquid level side pilot valve 25 are connected via the switching valve 13 by a high liquid level side pilot pipe 34. In the present embodiment, the pipe 35 from the pressure chamber 10 is branched in the middle, and one of them is branched to the low liquid side pilot pipe 3
3, the other is the high-level pilot pipe 34,
Each may be independently communicated with the pressure chamber 10.

As a result, the fluid on the primary side flows from the primary valve chamber 6 through the secondary valve chamber 7 into the liquid tank 1 via the main valve body 9, and a part of the fluid flows on the primary valve chamber 6 → By-pass pipe 32 → Valve bearing 16 → Pressure chamber 10 Flows from pressure chamber 10 to pressure chamber 10 → Low-level side pilot pipe 33 → Low-level side pilot valve 24 10 → upper valve chamber 19 of the switching valve 13 → lower valve chamber 20 → high liquid level side pilot pipe 34 → high liquid level side pilot valve 25 and the flow on the high liquid level side.

Next, the operating state of the two-stage switching type liquid level adjusting valve 2 thus configured will be described.

First, when the inside of the liquid tank 1 is empty, the floats 30 of the low-level side pilot valve 24 and the high-level side pilot valve 25 are rotated to their lowest positions, and both are in the open state. ing.

Further, the main valve body 9 is in a state in which the valve opening 8 is closed by its own weight. At this time, if the upstream valve (not shown) on the primary side is opened to flow the fluid, the fluid flows into the primary valve chamber 6 and the bypass pipe 32 into the pressure chamber 10. The fluid flowing into the pressure chamber 10 flows from the low liquid level side pilot pipe 33 to the low liquid level side pilot valve 24, and flows down into the liquid tank 1. Due to this flow, the pressure in the pressure chamber 10 becomes lower than that in the primary side valve chamber 6, a differential pressure is generated between the two chambers 6 and 10, and the fluid in the primary side valve chamber 6 pushes up the diaphragm 11 to cause the main valve body 9 to move. And the valve port 8 is opened to allow the fluid to flow to the secondary side valve chamber 7
To liquid tank 1.

Further, as the main valve body 9 rises, the valve body 14 of the switching valve 13 is pushed up by the valve shaft 15, the switching valve 13 also opens, and the fluid in the pressure chamber 10 passes through the switching valve 13 and the high-level side pilot piping 34 to the high-level side pilot valve 25, and the liquid tank 1
Run down.

When the liquid level in the liquid tank 1 rises from L1 to L2 and L3, the float 30 of the low liquid level side pilot valve 24 moves up to rotate the valve body 27 and open the valve port 26 of the low liquid level side pilot valve 24. close. However, since the switching valve 13 is open and the high-level side pilot valve 25 is open, the pressure chamber 1
The fluid in 0 continues to flow, the valve-opened state of the main valve body 9 is maintained, and the fluid is continuously delivered to the liquid tank 1.

When the liquid level in the liquid tank 1 further rises and the liquid level in the liquid tank 1 becomes the high liquid level state H3, the high liquid level side pilot valve 25 is closed and the outflow of the fluid in the pressure chamber 10 is stopped. The internal pressure rises, the diaphragm 11 is pressed from the pressure chamber 10 side, the main valve body 9 is pushed down, and the valve port 8 is closed.

The main valve body 9 is closed by the area difference of the diaphragm 11 facing both chambers 6 and 10, the weight of the main valve body 9, the pressure of the fluid, and the like. Further, depending on the distance between the valve shaft 15 of the main valve body 9 and the valve body 14 of the switching valve 13, the high liquid side pilot valve 25
By the balance between the outflow from the pressure chamber and the pressure in the pressure chamber 10,
When the main valve body 9 descends and the valve body 14 of the switching valve 13 closes, the flow from the high-level side pilot pipe 34 stops,
The main valve body 9 may be closed.

Thus, the fluid in the liquid tank 1 having the high liquid level H3 is used in the downstream equipment and is discharged from the liquid tank 1, and the liquid levels H2, H
When the pressure drops to 1, the high-level pilot valve 25 opens first, but since the switching valve 13 is closed, the fluid in the pressure chamber 10 does not flow out, and the main valve body 9 does not operate. Liquid level is L3
When the low liquid level side pilot valve 24 is opened below, the fluid in the pressure chamber 10 flows out through the low liquid level side pilot pipe 33 according to the opening degree, so that the pressure in the pressure chamber 10 is increased. The main valve body 9 is lowered and the main valve body 9 is raised to start the fluid supply. At this time, if the usage amount is small and the rate of decrease of the liquid level is small, the opening of the low liquid level side pilot valve 24 remains small, that is, the outflow of fluid from the pressure chamber 10 is small, and the opening of the main valve body 9 is small. In a small state, the inflow amount and the outflow amount of the liquid tank 1 are balanced,
The inside of the liquid tank 1 is maintained at a low liquid level in the range of L3 to L2.

When the downstream side usage amount increases and the liquid level in the liquid tank 1 decreases to L1 in such a low liquid level balanced state, the opening degree of the low liquid level side pilot valve 24 increases and the pressure chamber 10
The amount of fluid flowing out from the main valve body 9 is greatly opened, so that the valve shaft 15 pushes up the valve body 14 of the switching valve 13 to open the switching valve 13.

As a result, the outflow of the fluid from the high-level pilot valve 25 is started, and the pressure in the pressure chamber 10 is greatly reduced, so that the main valve body 9 is further opened, and the fluid is fed in the fully opened state. And the liquid level in the liquid tank 1 rises above L3,
Even if the low liquid level side pilot valve 24 is closed, the flow of the fluid from the high liquid level side pilot valve 25 maintains the open state of the main valve body 9.

When the liquid level further rises to H1 or higher and the high-level side pilot valve 25 begins to close, the amount of fluid flowing out of the pressure chamber 10 decreases, so the pressure in the pressure chamber 10 increases and the main valve body 9 closes. Move in the direction. As a result, the amount of fluid supplied becomes an amount commensurate with the amount discharged from the liquid tank 1, and the liquid level in the liquid tank becomes H.
Maintain a high liquid level by balancing between 1 and H2.

When the usage amount decreases in this state, the liquid level in the liquid tank 1 rises to H3, the high-level side pilot valve 25 closes, and the pressure chamber 10
The internal pressure is raised to close the main valve body 9. When the liquid level decreases to the position of L3 where the low liquid level side pilot valve 24 is opened, as described above, the low liquid level of L2 to L3 is balanced, and when the usage amount increases, the high liquid level of H1 to H2 increases. It will be in a balanced state by rank.

Further, as described above, by using needle valve type ball taps for both pilot valves 24 and 25, it becomes possible to more reliably maintain the above-mentioned balanced state. That is, since the movement of the float 30 that moves up and down due to the change in the liquid level is converted into the rotational movement of the valve body 27 and is advanced and retracted by an appropriate screw lead to open and close, the amount of fluid flowing out from the pilot valves 24 and 25 is Continuous and reliable control can be performed according to the displacement of the liquid level in the liquid tank 1. As a result, the pressure in the pressure chamber 10 can be continuously changed, so that the optimum opening degree of the main valve body 9 with respect to the liquid level in the liquid tank 1 can be obtained, and the amount used on the downstream side can be reduced. It is possible to achieve a balance with the optimum opening degree according to the situation.

Further, since the outflow amount of the fluid from the low liquid level side pilot valve 24 can be reliably controlled at a low liquid level, the switching valve 13 can be reliably opened by raising the main valve body 9 when necessary. A malfunction can be prevented by hunting.

By using the two-stage switching type liquid level adjusting valve configured as described above in a water supply facility having a water tank at the downstream side, it is possible to prevent water leakage with sufficient water supply or deterioration of water quality.

For example, when there is a large amount of water used during the day, it is possible to supply water with a margin by balancing the water tank with a high liquid level.
By balancing at a low liquid level, the residence time of water in the water tank can be shortened and the deterioration of water quality can be prevented. Further, when the amount of water used sharply increases due to digestion activity on the downstream side in a state of being balanced at a low liquid level, the water level is automatically switched to a high liquid level, so there is no shortage of supply. Therefore, it becomes possible to stably supply high-quality water.

The main valve body can be opened / closed by a piston type instead of a diaphragm, and each pipe and the like are appropriately determined depending on the installation location of the valve.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, the present invention provides a pilot valve that opens and closes according to the liquid level in the liquid tank at each of the heights in the liquid tank provided downstream of the valve to control the opening of the main valve and Since the liquid level is adjusted to two high and low levels, the liquid level in the liquid tank can be automatically adjusted according to the amount of liquid discharged from the liquid tank. Therefore, it is possible to raise the liquid level to perform stable supply when the amount of discharge is large, and to lower the liquid level when the amount of discharge is small to shorten the residence time of the fluid in the liquid tank and It is possible to prevent alteration and the like.

[Brief description of drawings]

FIG. 1 is a system diagram of a two-stage switching type liquid level adjusting valve showing an embodiment of the present invention, and FIG. 2 is a sectional plan view showing an embodiment of a pilot valve. 1 ... Liquid tank, 2 ... Two-stage switching type liquid level adjusting valve, 3 ... Main valve, 4 ...
Valve box, 6 ... Primary side valve chamber, 7 ... Secondary side valve chamber, 8 ... Valve port, 9
... Main valve body, 10 ... Pressure chamber, 11 ... Diaphragm, 12 ...
Diaphragm retainer, 13 ... Switching valve, 14 ... Valve body, 15 ...
Valve shaft, 16 ... Valve bearing, 24 ... Low liquid side pilot valve,
25 ... High-level pilot valve, 32 ... Bypass pipe, 33
… Low liquid level pilot piping, 34… High liquid side pilot piping

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic data Sho 49-26127 (JP, U) Real development Sho 53-149925 (JP, U) Real development Sho 55-147575 (JP, U) Real development Sho 49- 76316 (JP, U) JP 61-59432 (JP, B2) JP 61-27631 (JP, B2)

Claims (1)

[Claims] 1. A main valve body that opens and closes a valve opening of a main valve, and a pressure chamber into which a fluid on the primary side of the main valve is introduced. By changing the pressure of the chamber, the opening degree of the main valve body is changed to adjust the flow rate of the main valve, and the liquid level of the liquid tank provided downstream of the main valve is derived from the liquid tank. A two-stage switching type liquid level adjusting valve that adjusts to high and low levels according to the amount, and a low level side that opens and closes at predetermined positions of low level and high level in the liquid tank by changing the level. A pilot valve and a high-level pilot valve are respectively arranged, and the pressure chamber and the low-level pilot valve are connected by a low-level pilot pipe, and the pressure chamber and the high-level pilot valve are connected to each other. It is connected by a high-level pilot pipe provided with a switching valve that opens according to the opening degree of the main valve body. Switchable liquid level control valve.