JPS58214080A - Liquid level controlling device - Google Patents

Abstract

PURPOSE:To control positively and stably liquid level by a liquid level controlling device independent of a liquid tank. CONSTITUTION:When a main cock 36 for a liquid supply source 35 is opened under the opened condition of respective valves 12, 24, liquid from said source 35 is supplied to a liquid tank 37 through a main switching valve 12. When the liquid level rises from the lower surface of a liquid level detecting tube 8 to the higher position, air pressure in a pressure receiving chamber 27 of a pilot controlling valve 24 is raised under the condition of balancing with the liquid pressure. Then, a diaphragm 26 is reversed and the pilot controlling valve 24 is closed to raise the internal pressure in a pilot chamber 15 of the main switching valve 12. At the same time, a diaphragm 14 is operated reversely by difference of pressure receiving areas between effective sealing area of a valve hole 18 and that of a diaphragm 14 to close the main switching valve 12 and stop the liquid supply from the liquid supply source 35 to the liquid tank 37.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides liquid from a liquid supply source to a liquid tank;
The liquid supply is automatically stopped when the liquid in the liquid tank reaches a preset liquid level, and the liquid level is further reduced when the device is removed from the liquid level or when the liquid in the liquid tank is supplied to the outside. The present invention relates to a liquid level control device having a liquid level holding function that automatically starts liquid supply from a liquid supply source when the liquid level drops.

Conventionally, this type of liquid level control device generally includes a liquid level detection device for detecting the liquid level, and a control for performing output conversion after amplifying the liquid level detection fine input signal number from the detection device. It is configured as a series of system devices by combining devices and IIIJ control valves for switching the supply of liquid.

A typical example of a simple liquid level control device that combines the above functions is an opening/closing device equipped with a detection float mechanism and a mechanical mechanism for detecting the liquid level used in flush toilet equipment, aquarium tanks, etc. One option is to combine it with a valve, but in this case, the detection float mechanism is generally large, so a relatively large installation requires space, which limits the locations where the liquid level control device can be used. In addition, the installation of this device must be fixed in relation to the liquid tank, so there is a limit to the separation of the liquid tank and the liquid level 1b control device, so this liquid level control iMI device cannot be moved. It is unsuitable as a ceremony device.

Furthermore, when a series of system devices for the liquid level & iJ W4 device are combined into a unit or a panel device, the system as a whole not only becomes large-scale, but also has the drawback of becoming complicated and expensive.

The purpose of this invention is horizontal 31! It is an object of the present invention to eliminate the above-mentioned drawbacks of the conventional art by providing a liquid level control device that is simple, compact, low in production cost, and capable of reliably and stably controlling the liquid level.

Next, the configuration of an embodiment of the present invention will be explained with reference to FIGS. 1 to 3.

A liquid level control device 5 that combines four blocks 1 to 4 includes a liquid inlet lower formed on the side surface of the main body 6 and a liquid outlet 10 formed on the bottom of the recess 9 of the cylindrical liquid level detection tube 8 on the bottom surface of the main body 6. In the middle of the liquid flow path 11 formed between the main on-off valve 12, in this case, the diaphragm chamber 13 is partitioned into two chambers, a pilot chamber 15 and a valve chamber 16, by a diaphragm 14. Diaphragm 1
4 (the state shown in FIG. 3), the liquid flow path 11
A main opening/closing valve 12 is formed which closes the liquid flow path 11 and opens the liquid flow passage 11 by the restoring operation of the diaphragm 14 due to the pressure reduction in the pilot chamber 15 (the state shown in FIGS. 1 and 2).

A valve seat 17 is formed in a protruding manner within the valve chamber 16 of the main on-off valve 12 so as to come into contact with the center of the diaphragm 14 when the diaphragm 14 is reversed. Therefore, even if the pressure in the Byron I chamber 15 is considerably lower than the liquid supply pressure in the liquid flow state with the valve open, the diaphragm 14 is in reverse operation li! In addition, the pilot chamber 15 of the main on-off valve 12 is connected to the gas pressure inlet 2 from the pilot passage 19.
0 and a main cock 21, and a gas pressure source 22 via a fixed A refit 23.

On the other hand, this pylon 1 to passage 19 is connected to the pilot control valve 2
4. In this case, the diaphragm chamber 25 is partitioned into two chambers, the pressure receiving chamber 27 and the valve chamber 28, by the diaphragm 26, and the pressure receiving chamber 27
The reversal operation of the diaphragm 26 due to the increase in pressure (as shown in FIG.
9 is closed and the diaphragm 26 is restored due to the pressure reduction in the pressure receiving chamber 27 (the state shown in FIGS. 1 and 2), the pilot passage 19 is opened via the pilot control valve 24 and the air bleed 29 which also serves as a drain. reached,
The pressure receiving chamber 27 of the bi-zero control valve 24 is a fixed orifice 3.
In addition to communicating with the pilot passage 19 through the passage 31, it also communicates with the recess 9 of the liquid level detection cylinder 8 through the passage 31 at its bottom.

In addition, 32 and 33 are seal rings for holding each diaphragm 14 and 26, 34 is a blind plug, and 35 is connected to the liquid inlet lower of the liquid level control device M5 via a main cock 36 for opening and closing the liquid flow passage 11, which can be manually or remotely controlled. Indicates a liquid supply source such as a water supply or hydraulic tank.

Next, the operation of this embodiment will be explained with reference to FIGS. 2 and 3.

When supplying the liquid from the liquid supply source 35 to the liquid Fa 37 and maintaining the liquid in the liquid tank 37 at a preset liquid level, liquid level control! The liquid level detection 118 of lv4 and 5 is connected to the liquid tank 37.
The liquid level υ is adjusted to the preset liquid level position in
Attach the 1111 charger 5 to the liquid tank 37.

In this installation state, when the main cock 21 for the gas pressure source 22 is opened, the pressure receiving chamber 27 of the pilot control valve 24 is exposed to the atmosphere because the recess 9 of the liquid level detection tube 8 is opened to the atmosphere. is in the open state, and the pilot passage 19 is also by 0.
Since the air is released through the air pulley 29 in the valve chamber 28 of the control well 24, the main on-off valve 12 is also in an open state.

Therefore, when the main valve 360 fl for the liquid supply source 35 is opened with these eight valves 12 and 24 open, the liquid from the liquid supply source 35 passes through the main on-off valve 12 on the way to the liquid flow path 11, as shown in FIG. It is supplied to the tank 37, where the main on-off valve 12
The outflow passage 38 has a larger passage effective cross-sectional area than the inflow passage 39 to reduce the liquid pressure in the outflow passage 38 to near atmospheric pressure, so that the liquid pressure acts on the diaphragm 14 near the valve hole 18 in the center of the diaphragm 14. At the same time,
Liquid from liquid source 35 flows through main shutoff valve 12 to liquid reservoir 37 .

As the liquid is supplied to the liquid tank 37 in this way, the liquid level in the liquid tank 37 gradually rises, and when the liquid level reaches the lower surface of the liquid level detection section 18, it further rises, and the by-zero control is performed. The air pressure inside the pressure receiving chamber 27 of the valve 24 increases while being balanced with the liquid pressure, and the diaphragm 26 is reversed due to the pressure received by the diaphragm 26 from the pressure receiving chamber 27 and the valve chamber 28, and the pilot control valve 24 is activated. When the pressure inside the pilot chamber 15 of the main on-off valve 12 increases, the diaphragm 14 operates in reverse due to the difference in the pressure-receiving area between the effective sealing area of the valve hole 18 and the effective area of the diaphragm 14, and the main on-off valve 12 closes. 12 is stopped, and the liquid supply from the liquid supply source 35 to the liquid tank 37 is stopped.

Next, while this liquid level is maintained and the liquid supply is stopped, the liquid in the liquid tank 37 is supplied to the outside, and the liquid level in the liquid tank 37 becomes lower than the preset level, and the pilot control valve 24 receives pressure. When the air pressure in the chamber 27 drops to a constant pressure, the diaphragm 26 is activated to restore and the pilot control valve 24 is opened, and the pilot chamber 15 of the main on-off valve 12 is also depressurized, so the diaphragm 14 is activated to restore and the pilot control valve 24 is opened. Open/close valve 1
2 opens.

As a result, liquid is again supplied to the liquid tank 37 from the liquid supply source 35, and when the liquid level in the liquid tank 37 reaches the preset liquid level, the main on-off valve 12 is closed and the supply of liquid is stopped, and the above operation is repeated again in a state where the liquid level has fallen below a predetermined position in consideration of hysteresis characteristics, and the liquid level in the liquid tank 37 is reduced to 12 tanks 37. The internal liquid can be maintained almost constant regardless of whether it is supplied to the outside.

The diaphragm 14.26 of the eight valve 12.24 is hollowly supported in local contact with the valve seat 17.4o protruding into the valve chamber 16.28 as shown in FIG. 3 during pressure receiving operation. 26 Sorin has the flexibility to bend in response to minute pressure, and the combination of I membrane material that suppresses longitudinal elongation to below a certain value ensures a sufficient effective pressure receiving area for force conversion without the need for a pressure receiving plate. In addition, the valve seat 17.40 can be adequately sealed against inclination and eccentricity of the valve seat. Furthermore, the border of diaphragm 14.26 Tozai,
Since wrinkles are absorbed into the hollow part, the diaphragm 14.
26, the sealing of the valve seat 17.40 is always maintained reliably.

The material of the diaphragm 14.26 is selected depending on the conditions of use, and examples thereof include a ms rubber plate or leather containing ms or resin thin threads in a mesh or open pattern, a resin film (thin plate), and the like.

Based on the above characteristics, the diaphragm 26 of the pilot control valve 24 for liquid level detection has its surface oriented perpendicularly to the horizontal plane of gravity, thereby preventing the influence of the own weight of the diaphragm 26 itself. There is.

Next, FIG. 4 shows a liquid level control @M5' according to another embodiment of the present invention, in which a diaphragm-operated pilot control valve for controlling opening and closing of communication with the atmosphere is provided above the liquid level detection wo''.
In this case, when there is no liquid in the liquid tank 37, the pilot & lJ III valve 24 is closed because its pressure receiving chamber 27 is open to the atmosphere, and the main on-off valve 12 is also in an open state. Even if liquid is supplied to the liquid 137 through the on-off valve 12, the liquid pressure in the valve chamber 16 of the main on-off valve 12 is low, so the pilot control valve 41 remains open and the liquid level in the liquid tank 37 is lower than that shown in FIG. Even if it exceeds the 1st position, the liquid level detection tube'
8' recess 9' pilot] - Since the control valve 41 communicates with the atmosphere through the ablead 42, the liquid level further rises, and the liquid level rises further when the recess 9' is blocked from communicating with the atmosphere. 4
When position L22 in the figure is reached, the main ml closing valve 12 closes together with the pilot control valve 24 to stop the supply of liquid, and
Due to the increase in hydraulic pressure caused by this stop, the pilot control valve 4
1 is also closed.

Even if the liquid in the liquid tank 37 is supplied to the outside and the liquid level in the liquid tank 37 becomes 2 or less in FIG. The main on-off valve 12 also remains closed, and when the liquid level falls below L1 in FIG. When the liquid is opened, liquid is supplied to the liquid tank 37, and the pilot control valve 41 is opened due to the drop in liquid pressure due to this liquid supply, and the same operation as described above is repeated again, and the liquid level reaches the second position in Fig. 4. At this point, the liquid supply is stopped.

As described above, the present invention allows the liquid level position of the liquid supplied from the liquid supply source to the liquid tank to be adjusted in the liquid direction +bq independent of the liquid tank.
The liquid level control device can be easily maintained at a constant level using a device, and the entire liquid level control device can be made compact, making the space required for installing the device significantly smaller compared to conventional mechanical υ control. effective.

[Brief explanation of drawings]

Figure 1 is a cutaway front view of one embodiment of the present invention, Figures 2 and 3 are
The figure is an explanatory diagram showing the state of use, and FIG. 4 is a sectional front view of another embodiment of the present invention. 5...Liquid level control device 8...Liquid level detection tube 11...Liquid flow path 12...Main opening/closing valve 19.31...Pilot passage 24...Pilot 1ilj m valve 35... Liquid supply source 37...Liquid tank agent Patent attorney 1 Tsutomu Figure 1

Claims (1)

[Claims] A liquid flow path that supplies liquid from a liquid supply source to a liquid tank.
At the top, a diaphragm divides the diaphragm chamber into a pilot chamber and a valve chamber, and a valve seat is formed with a valve hole at a position facing the center of the diaphragm of the valve chamber, and the pressure in the bias chamber increases. A main opening/closing valve is provided that closes the valve by the contact between the diaphragm and the valve seat due to the reversal action of the diaphragm, and the diaphragm partitions the diaphragm chamber into a pressure receiving chamber and a valve chamber in the middle of the pilot passage that communicates the gas pressure source with the atmosphere. A valve seat with a valve hole is formed at a position facing the medium heat part of the diaphragm of the chamber.
A pilot control valve is provided which closes the valve by contact between the diaphragm and the valve seat due to the reverse operation of the diaphragm when the pressure in the pressure receiving chamber increases, and the inflow side pilot passage of the pilot control valve is connected to the pressure receiving chamber of the pilot control valve and the above. A liquid level detection tube that communicates with the pilot chamber of the main on-off valve and further communicates with the pressure receiving chamber of the bi-zero control valve.The liquid tank in the pressure receiving chamber due to contact with the liquid level in the liquid tank or submersion in the liquid. The diaphragm of the pilot III control valve is operated in reverse by the increase in pressure corresponding to the internal liquid level height to close the pilot passage, and the main r due to the closing of the pilot passage
A liquid level control device characterized in that a diaphragm of a main opening/closing valve is operated in reverse by an increase in pressure corresponding to a gas pressure source in a pilot chamber of a LAR11 valve to close the liquid flow path.