JPH084939A - Liquid supply control device - Google Patents

Abstract

PURPOSE:To facilitate the attachment/detachment of a liquid supply control device to/from a liquid storage tank, and miniaturize the device. CONSTITUTION:A pilot valve mechanism 6 where a liquid supply valve mechanism 2 is connected by nuts 4 and a guide cylinder 5 is screwed is fitted to a tank 1. A liquid supply valve 14 supported by a diaphragm 15 is arranged an entrance of a fluid discharge passage 13 of the fluid supply valve mechanism 2, and a pressure adjusting chamber 17 is provided at the back of the fluid supply valve 14. A cylindrical pilot main valve 24 is fitted to a casing 21 of the pilot valve mechanism 6 in the vertically movable manner to allow the lower surface to open/close a first discharge port 23. A pilot sub valve 33 is inserted in a cylindrical hole of the pilot main valve 24 so as to open/close a second discharge port 30 by a flange 33b. The flange 33b is energized downward by a compression spring 34, and the lower end of a shaft part 33a is freely fitted to a fitting hole 41b of a lever 41 to be turned by a float 47.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid supply valve mechanism so as to maintain the liquid level in a liquid storage tank by adjusting the amount of control liquid discharged from a pilot valve mechanism communicating with the liquid supply valve mechanism. The present invention relates to a liquid supply control device for automatically controlling.

[0002]

2. Description of the Related Art Conventionally, in this type of liquid supply control device,
The liquid supply valve mechanism that adjusts the amount of liquid supplied to the liquid storage tank is connected via a lever to the float floated on the liquid surface in the liquid storage tank, and when the float descends with the liquid level, the liquid supply valve mechanism. Starts the liquid supply, and when the float rises with the liquid level and recovers the constant liquid level, the liquid supply valve mechanism stops the liquid supply.

[0003]

However, in the prior art, since the float and lever are fixed to the liquid storage tank in a state of being connected to the liquid supply valve mechanism, the entire liquid storage tank is used for maintenance and inspection and liquid level adjustment. There is a problem that it must be removed from the tank. Further, since the liquid supply valve mechanism operates by the buoyancy and gravity of the float, there is a problem that one or both of the float and the lever must be large in size in order to reliably operate the liquid supply valve mechanism.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a liquid supply control device which is easy to perform maintenance and inspection and liquid level adjustment, and which operates reliably even with a small size.

[0005]

A liquid supply controller according to a first aspect of the present invention for achieving the above object is a liquid supply valve mechanism for adjusting the amount of liquid flowing into a liquid storage tank, and the liquid supply valve mechanism. And a pilot valve mechanism that adjusts the amount of control liquid that flows in from the liquid supply valve mechanism, and the pilot valve mechanism is driven by a float that is engaged with the pilot valve mechanism and floats on the liquid surface in the liquid storage tank. And a guide cylinder that is connected to the pilot valve mechanism so as to hang down in the liquid storage tank and has the float inside, and the liquid supply valve mechanism and the pilot valve mechanism are connected to the liquid storage tank. It is characterized by being attached detachably from the outside.

The liquid supply control device according to the second aspect of the present invention includes a liquid supply valve mechanism that is connected to an upper wall opening of the liquid storage tank and adjusts the amount of liquid flowing into the liquid storage tank, and a liquid supply valve mechanism above the liquid storage tank. A pilot valve mechanism that is connected to the wall opening and the liquid supply valve mechanism and adjusts the amount of control liquid flowing from the liquid supply valve mechanism, and is engaged with the pilot valve mechanism and floated on the liquid level in the liquid storage tank. A valve drive mechanism that drives the pilot valve mechanism by a float, and a guide cylinder that engages with the pilot valve mechanism so as to hang down in the liquid storage tank and that has the float inside.
The pilot valve mechanism has a first inflow passage that is coupled to the upper wall opening of the liquid storage tank and the liquid supply valve mechanism and into which the control liquid flows from the liquid supply valve mechanism, and communicates with the first inflow passage. A casing having a first discharge port for discharging the control liquid to the liquid storage tank, a cylindrical pilot main valve that is vertically movably fitted to the casing to open and close the first discharge port, and the pilot main valve A pilot sub-valve that opens and closes a second discharge port provided in a cylindrical hole of the valve, a biasing unit that biases the pilot sub-valve so as to close the second discharge port, and a detachable member at an upper opening of the casing. And a second inflow passage through which a part of the control liquid flows from the first inflow passage toward the cylindrical hole in the upper portion of the pilot sub-valve in the pilot main valve, Check that the pilot auxiliary valve is engaged with the valve drive mechanism. And butterflies.

[0007]

In the liquid supply control device according to the first aspect of the present invention having the above-mentioned structure, the liquid supply valve mechanism and the pilot valve mechanism are detachably connected from the outside of the liquid storage tank. Perform them by removing them from the liquid storage tank.

In the liquid supply control device according to the second aspect of the invention, when the float descends, the valve drive mechanism drives the pilot sub valve to open the second discharge port. When the second discharge port is opened, the liquid in the cylindrical hole above the pilot sub valve is discharged from the second discharge port, and the pilot main valve rises to open the first discharge port. When the first discharge port is opened, the control liquid comes to the first position from the liquid supply valve mechanism.
The liquid is discharged from the first discharge port through the inflow path, the liquid supply valve mechanism is activated, and liquid supply is started. On the other hand, when the constant liquid level is restored, the biasing means biases the pilot sub valve to close the second discharge port, and the pilot main valve and the liquid supply valve mechanism are operated in reverse to stop the liquid supply.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 is a partial cross-sectional view of the first embodiment, showing a liquid supply stopped state. For example, a liquid supply valve mechanism 2 has a packing 3 at one opening of a tank 1 in which a liquid such as water is stored.
It is detachably connected by a nut 4 via. A pilot valve mechanism 6 having a guide cylinder 5 screwed into the lower portion thereof is removably fitted to the other opening of the tank 1 via a packing 7. The liquid supply valve mechanism 2 and the pilot valve mechanism 6 are connected via a packing 8.

The casing 11 of the liquid supply valve mechanism 2 has a cylindrical main body 11a, and a horizontal liquid supply inlet 12 into which the liquid is supplied from a liquid supply pipe (not shown) and a liquid supply inlet 12 communicating with the horizontal liquid supply inlet 12. The vertical liquid supply outlet 13 through which the liquid supply flows into the tank 1.
Is provided. The inlet peripheral wall of the liquid supply inlet 12 is a connecting portion 11b to which the liquid supply pipe is connected, and the inlet peripheral wall of the liquid supply outlet 13 is a liquid supply valve seat 11c with which the liquid supply valve 14 is brought into and out of contact with the liquid supply outlet 13. A peripheral wall of the outlet is a guide portion 11d which is fitted into the opening of the tank 1. The liquid supply valve 14 is a diaphragm 15
And the outer peripheral edge of the diaphragm 15 is held by the main body 1
A cap 1 detachably attached to the upper opening of 1a
It is fixed to the upper end of the main body 11a by 6. A space surrounded by the diaphragm 15 and the cap 16 serves as a pressure adjusting chamber 17 that displaces the diaphragm 15 by hydraulic pressure. In the body portion 11 a, the cap 16 and the diaphragm 15, a part of the liquid supply from the liquid supply inlet 12 is adjusted in the pressure adjusting chamber 17
An inflow passage 18 for inflowing into the valve and an outflow passage 19 for outflowing the control liquid from the pressure adjusting chamber 17 to the pilot valve mechanism 6 are formed.

Here, the liquid supply valve 14 has a fixed portion 14a outside the pressure regulating chamber 17 and fixed portions 14b, 14 having different inner diameters.
is held by the diaphragm 15 via the pressure control chamber 17
When the pressures inside and outside the chamber become the same, the liquid supply valve 14 and the fixed portion 1
The gravity of 4a, 14b and 14c and the urging force of the diaphragm 15 itself will surely close the liquid supply outlet 13. A stopper 20 for restricting the operation range of the liquid supply valve 14 is attached to the cap 16 so that the position thereof can be adjusted.

On the other hand, the casing 2 of the pilot valve mechanism 6
1 is a small-diameter cylindrical portion 21 as shown in a partially enlarged sectional view of FIG.
The upper part has a and the large-diameter cylindrical part 21b is in the lower part. The large-diameter cylindrical portion 21b has a coupling portion 2 coupled to the liquid supply valve mechanism 2.
A guide portion 2 having a side portion 1c and coupled to the tank 1
1d is provided at the bottom. A first inflow passage 22 through which the control liquid flows from the outflow passage 19 of the liquid supply valve mechanism 2 into the casing 21 is provided in the connecting portion 21c, and the guide portion 21d is provided.
The first discharge port 2 through which the control liquid is discharged from the casing 21
3 is provided, and the peripheral wall of the first discharge port 23 is a valve seat 21e.

Inside the casing 21, a cylindrical lower flange 24b is fitted so as to be vertically movable. A large diameter upper flange 24a is provided on the upper and lower outer circumferences of the pilot main valve 24.
And a small-diameter lower flange 24b are respectively provided, the outer peripheral surface of the upper flange 24a slides on the inner peripheral surface of the small-diameter cylindrical portion 21a, and the bottom surface of the pilot main valve 24 can be brought into and out of contact with the valve seat 21e. The packing 25 is interposed on the outer periphery of the upper flange 24a, and the packing 2 is provided on the lower flange 24b.
6 is fixed by a fixing member 27. in this way,
A cap 28 is detachably covered with a packing 29 at an upper opening of the casing 21 into which the pilot main valve 24 is fitted.

The cylinder hole of the pilot main valve 24 is a concentric upper cylinder hole 3 having a second discharge port 30 with a smaller diameter in the middle.
1 and the lower cylindrical hole 32. A pilot sub valve 33 having a shaft portion 33a and a flange 33b is vertically and tiltably and movably inserted into the upper cylindrical hole 31 and the lower cylindrical hole 32. The flange 33b can be brought into and out of contact with the valve seat 24c on the peripheral wall of the second discharge port 30, and the flange 33b
A compression spring 34 is arranged on the upper part of b. One end of the compression spring 34 has a hollow member 3 screwed into the upper cylindrical hole 31.
By being fixed by 5, the pilot auxiliary valve 33 is urged downward by the compression spring 34.

Here, inside the casing 21,
The space below the upper flange 24a of the pilot main valve 24 is defined as a first chamber 36, and the upper cylinder hole 3 of the pilot main valve 24 is formed.
The space above 1 is a second chamber 37. Further, the pilot main valve 24 is provided with a small-diameter second inflow passage 38 through which a part of the control liquid that has flowed in from the first inflow passage 22 flows into the second chamber 37 from the first chamber 36. This second inflow path 3
One end of 8 is opened to the 1st chamber 36, and the other end is opened above the flange 33b of the pilot auxiliary valve 33.

Further, since the outer diameter of the upper flange 24a is larger than that of the lower flange 24b, the pressure receiving area for the lower portion is larger in the upper flange 24a than in the lower flange 24b, and the pilot auxiliary valve 33 is When the second discharge port 30 is closed, the pilot main valve 24 surely closes the first discharge port 23 by the control liquid flowing from the second inflow passage 22. A packing 39 is provided on the valve seat 24c.

Further, a supporting rod 40 having a slit 40a in the lower portion is vertically provided at the lower portion of the casing 21, and a first lever 41 is inserted into the slit 40a of the supporting rod 40 and is rotatable by a shaft 42. Supported by. The first lever 41 is arranged so that the upper tip end portion 41a contacts the upper wall of the slit 40a when it is rotated counterclockwise, and the rotation range is restricted. The upper edge of the first lever 41 is bent to one side, and the bent portion has a fitting hole 41b into which the shaft portion 33a of the pilot sub valve 33 is loosely fitted.
Is provided. An upper end of an L-shaped second lever 43 is rotatably supported by a shaft 44 on the other end side of the first lever 41, and a rod 45 is supported on the other end of the second lever 43.

An upper stopper 46, a float 47, and a lower stopper 48 are fitted on the rod 45 in order from above in a vertically movable manner. The upper stopper 46 and the lower stopper 48 are fixed after being adjusted in position for adjusting the liquid level, the float 47 is floated on the liquid surface in the tank 1, and moves vertically between the upper stopper 46 and the lower stopper 48. It is free. A nut 49 is screwed onto the lower end of the rod 45 to prevent the upper stopper 46, the float 47 and the lower stopper 48 from falling off.

In FIG. 1, the liquid level in the tank 1 is at a constant liquid level,
The float 47 rises and comes into contact with the upper stopper 46, and the liquid supply valve 14 is closed. Even if the liquid level drops from this state, the liquid level continues to drop until the float 47 contacts the lower stopper 48, and the liquid supply valve 14 remains closed. When the liquid level further lowers and the gravity of the float 47 acts on the lower stopper 48, the rod 45 lowers and the first lever 41 rotates counterclockwise as shown in FIG. The portion 33a is pressed by the side wall of the fitting hole 41b and tilts.

At the same time, the flange 3 of the pilot sub valve 33
3b is tilted, and the control liquid in the second chamber 37 is discharged from the second discharge port 30. As a result, the hydraulic pressure in the second chamber 37 decreases, the pilot main valve 24 rises, and the control liquid in the first chamber 36 is discharged from the first discharge port 23. Subsequently, the control liquid in the pressure regulating chamber 17 flows into the outflow passage 19, the first inflow passage 22, and the first chamber 36, the hydraulic pressure in the pressure regulating chamber 17 decreases, and the liquid supply valve 14 is displaced upward. Then, the liquid supply is started in the tank 1 via the liquid supply inlet 12 and the liquid supply outlet 13.

On the other hand, when the liquid level rises due to the start of liquid supply and the float 47 rises, the pilot sub-valve 33 is restored by the urging force of the compression spring 34 and the flange 33b moves to the second position as shown in FIG. The discharge port 30 is closed. In this state, when the control liquid continues to flow from the first chamber 36 into the second chamber 37 through the second inflow passage 38, the hydraulic pressure in the second chamber 37 increases and the pilot main valve 24 descends. The first discharge port 23 is closed. As a result, the liquid pressure in the pressure adjusting chamber 17 rises, the liquid supply valve 14 is displaced downward, and the liquid supply is stopped.

As described above, the first embodiment is the liquid supply valve mechanism 2
Since the pilot main valve 24 and the pilot auxiliary valve 33 are provided in the pilot valve mechanism 6 for controlling the control valve and the pilot auxiliary valve 33 is driven by the float 47, the liquid supply valve mechanism 2 is controlled only by the pilot valve 24. The driving force of the float 47 can be reduced and the size of the float 47 and the pilot valve mechanism 6 can be reduced as compared with the case of performing.

Further, since the liquid supply valve mechanism 2 and the pilot valve mechanism 6 are detachably connected to the tank 1 from the outside, they can be easily removed from the outside of the tank 1 for maintenance and inspection and liquid level adjustment. it can. Further, since the liquid supply valve mechanism 2 and the pilot valve mechanism 6 are detachably covered with the cap 16 and the cap 28, the maintenance and inspection can be easily performed only by removing them.

In this embodiment, the pilot auxiliary valve 3
Although the shaft portion 33a of No. 3 is tilted, the same effect can be obtained even if the shaft portion 33a is vertically moved.

FIG. 4 is a cross-sectional view of the second embodiment showing the connecting means of the guide cylinder. In the tank 1, a cylindrical holder 51 having a flange 51a is provided with a nut 10 via a packing 9.
It is fixed by. A guide cylinder 52 is fitted in the holder 51, and is fixed by a union nut 54 via an O-ring 53. Here, the upper portion of the guide cylinder 52 is projected from the upper wall of the tank 1 by a predetermined amount and is fixed via the O-ring 53. The pilot valve mechanism 6 similar to that of the first embodiment is coupled to the upper end of the guide cylinder 52 by screwing or the like, and the other configurations are the same as those of the first embodiment.

In the second embodiment, the same effect as the first embodiment is obtained, and in addition, the union nut 54 is loosened to adjust the height of the guide cylinder 52 to adjust the liquid level adjustment range. It can be wider than in the first embodiment.

[0027]

As described above, in the liquid supply control device according to the first aspect of the present invention, the liquid supply valve mechanism and the pilot valve mechanism can be attached and detached from the outside of the liquid storage tank. The liquid level can be easily adjusted from the outside of the liquid storage tank.

Further, in the liquid supply control device according to the second aspect of the present invention, the liquid supply valve mechanism is controlled by the pilot valve mechanism, the pilot valve mechanism is constituted by the pilot main valve and the pilot auxiliary valve, and the pilot auxiliary valve is the valve drive mechanism. Driven by
Even if the float is small, the pilot valve mechanism can be accurately operated, and the pilot valve mechanism can also be downsized because it only adjusts the amount of control liquid of the liquid supply valve mechanism. Furthermore, in addition to the assembling work, maintenance inspection and liquid level adjustment can be easily performed from the outside of the liquid storage tank, and simple maintenance inspection can be performed by simply removing the lid.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a partially enlarged sectional view.

FIG. 3 is an operation explanatory view.

FIG. 4 is a sectional view of a guide tube coupling means according to a second embodiment.

[Explanation of symbols]

 1 Liquid Storage Tank 2 Liquid Supply Valve Mechanism 4, 10 Nuts 5, 52 Guide Tube 6 Pilot Valve Mechanism 11, 21 Casing 14 Liquid Supply Valve 15 Diaphragm 16, 29 Cap 17 Pressure Control Chamber 18 Inflow Channel 19 Outflow Channel 22 First Inflow Line 23 1st discharge port 24 Pilot main valve 30 2nd discharge port 33 Pilot auxiliary valve 34 Compression spring 36 1st chamber 37 2nd chamber 38 2nd inflow passage 45 Rod 46 Upper stopper 47 Float 48 Lower stopper

Claims (6)

[Claims] 1. A liquid supply valve mechanism for adjusting the amount of liquid flowing into a liquid storage tank, and a pilot valve mechanism connected to the liquid supply valve mechanism for adjusting the amount of control liquid flowing from the liquid supply valve mechanism. , A valve drive mechanism that drives the pilot valve mechanism by a float that is engaged with the pilot valve mechanism and floated on the liquid surface in the liquid storage tank, and is coupled to the pilot valve mechanism so as to hang down in the liquid storage tank In addition, the liquid supply control device is characterized in that the liquid supply valve mechanism and the pilot valve mechanism are detachably attached to the liquid storage tank from the outside. 2. A liquid supply valve mechanism that is connected to an upper wall opening of the liquid storage tank and adjusts the amount of liquid flowing into the liquid storage tank, and is connected to the upper wall opening of the liquid storage tank and the liquid supply valve mechanism. A pilot valve mechanism that adjusts the amount of control liquid flowing from the liquid supply valve mechanism, and a valve that drives the pilot valve mechanism by a float that is engaged with the pilot valve mechanism and floats on the liquid surface in the liquid storage tank A drive mechanism and a guide cylinder that engages with the pilot valve mechanism so as to hang down in the liquid storage tank and has the float inside, and the pilot valve mechanism includes an upper wall opening of the liquid storage tank and the guide cylinder. It has a first inflow path coupled to the liquid supply valve mechanism and through which the control liquid flows from the liquid supply valve mechanism, and a first discharge port communicating with the first inflow path for discharging the control liquid to the liquid storage tank. The casing that you have and the casing A cylindrical pilot main valve for opening and closing the first discharge port, and a second pilot main valve provided in a cylindrical hole of the pilot main valve.
A pilot sub-valve for opening and closing the discharge port, and a biasing means for biasing the pilot sub-valve so as to close the second discharge port,
A lid body detachably covering the upper opening of the casing is provided, and a part of the control liquid flows into the pilot main valve from the first inflow path toward the cylindrical hole above the pilot sub valve. And a second inflow passage for connecting the pilot auxiliary valve to the valve drive mechanism. 3. The liquid supply control device according to claim 1, wherein the liquid supply valve mechanism and the pilot valve mechanism are connected directly or via a connecting pipe. 4. The liquid supply control device according to claim 1, wherein the guide cylinder is connected to an opening of the liquid storage tank so that its height position can be adjusted. 5. The pilot sub-valve has a shaft portion that is inserted into the cylinder hole and a flange portion that opens and closes the second discharge port, and the valve drive mechanism tilts the shaft portion of the pilot sub-valve. The liquid supply control device according to claim 2, further comprising means for moving up and down, which is engaged with the pilot valve mechanism. 6. The valve drive mechanism comprises, in addition to the float floated on the liquid surface of the liquid storage tank, a rod engaged with the pilot valve mechanism and fitted with the float so as to be movable up and down, Adjusting the positions of the upper stopper and the lower stopper, having an upper stopper that is positionally attached to the rod above the float, and a lower stopper that is positionally attached to the rod below the float. The liquid supply control device according to claim 2, wherein the liquid level in the liquid storage tank is adjusted by means of.