JPH01189708A - Level sensor and automatic shutoff valve - Google Patents

Abstract

PURPOSE:To obtain a level sensor with high identification capacity for a level by providing a ternary pipe whose one end is coupled with a detector, whose other end pierces through a prescribed position at an eddy cylinder, and whose other end forms a level detecting aperture. CONSTITUTION:When a valve shaft 17 is raised, a claw 24 hangs and stays on a receiver 25. Therefore, since a valve 16 is separated from a valve seat 15, liquid flows in from an inflow opening 12, and is stopped at the lower end part 14 of an inflow pipe 11 with the valve seat passing around the valve 16, and increases flow velocity, and flows in the side wall of the upper end part of the eddy cylinder 10 in a circumferential direction. In the cylinder 10, the liquid flows out from an aperture end on the lower side as whirling, then, is injected in a tank 29. After the liquid is injected in the tank 29 and a level arrives at an injection terminate level 30, the liquid is sucked up from the level detecting aperture 28, and also, the negative pressure is applied on a pressure detector 26, then, the receiver 25 is separated from the claw 24 of the ternary pipe 27. In other words, a level signal is outputted from the detector 26.

Description

[Detailed Description of the Invention] [Industrial Application Field] These inventions relate to level sensors and automatic shutoff valves that are applied to liquid level detection and faucets in household bathtubs, liquid tanks in chemical plants, bio plants, etc. It is related to.

[Conventional technology]

(1) A conventional device will be explained with reference to FIG.

A conventional pressure (positive pressure with respect to atmospheric pressure) type level sensor has a pressure detector, one end is a gas inlet, the other end is placed at a predetermined position in the tank 8, and the other end is placed in the above-mentioned position. A three-branch pipe 38 is connected to a pressure sensor 39.

In addition, the pressure detector 39 can be a hero, a tire flam,
It uses a Fulton tube, mercury switch, semiconductor, etc., and is preset to output a signal when the liquid level reaches a predetermined level.

With the above configuration, gas at a constant pressure is sent from the gas inlet of the three-branch pipe 38, and then liquid is injected into the tank 8 from the faucet 40. As the liquid level 9 approaches a predetermined level, the pressure sensor 39 is proportionally pressurized. Therefore, when the liquid level 9 reaches a predetermined level, the pressure sensor 39 is activated and outputs an electrical or mechanical signal.

(2) A conventional device will be explained with reference to FIG.

A conventional float type valve has a float 2 at one end of a lever 1, and a valve 4 connected to the other end of the lever 1 by a link mechanism 3 is provided in a flow path 6. The flow path 6 has a serpentine lower end and a valve seat 5 facing the valve 4. Furthermore, these are attached to the inner upper part of the tank 8.

In the above configuration, when the liquid level 9 is low, the float 2 is at the bottom, and the link mechanism 3 causes the valve 4 to move away from the valve seat 5 and move downward. Liquid therefore flows out of the serpentine lower through the hole in the valve seat 5.

As the liquid level 9 rises, the float 1 rises, and the link mechanism 3
It moves upward through valve 4.

Therefore, when the liquid level 9 reaches a predetermined height, the valve 4 seats on the valve seat 5 and the liquid stops flowing out.

[Invention or problem to be solved]

(1) The conventional pressure type sensor described above has the following problems and unresolved problems.

(a) Since the pressure sensor is pressurized in proportion to the rise in the liquid level, it is difficult to distinguish between when the liquid level reaches a predetermined level and before it reaches a certain level.

(b) Reproducibility as a level sensor, that is, reliability is poor.

(c) An extra constant pressure gas supply system is required.

(2) The conventional float type valve described above has the following problems and problems to be solved.

(a) When used in bathtubs, etc., the floating part protrudes greatly and becomes a hindrance to use.

(b) Since the valve moves toward the valve seat approximately in proportion to the height of the liquid level, as the liquid level approaches a predetermined height, the valve approaches the valve seat and the amount of liquid flowing out decreases. Therefore, it takes time for the liquid level to reach a predetermined height.

(c) It is difficult to set the injection stop level.

[Means to solve the problem]

In order to solve the above problems, these inventions have the following configuration.

(1) A spiral cylinder whose upper end is closed and whose lower end is funnel-shaped,
an inflow pipe that is constricted along the flow direction and bent substantially horizontally or obliquely downward, and coupled to the lower end or the upper side wall of the spiral cylinder along the circumferential direction; and a thin film seal made of a flexible material. A three-branch pipe is provided, one end of which is connected to the same pressure sensor, one end of which penetrates into the spiral cylinder at a predetermined position, and the other end of which is a level detection opening.

(2) A spiral cylinder whose upper end is closed and whose lower end is funnel-shaped;
The upper end is closed and has an inlet at the upper end, and the lower flow path is narrowed along the flow direction and bent approximately horizontally or diagonally downward, and the lower end or the upper side wall of the spiral cylinder is
An inflow pipe with a valve seat connected along the circumferential direction and having an annular valve seat in the center, a valve corresponding to the valve seat, and an inflow pipe with the valve at one end above or below the inflow pipe with a valve seat. a thin film sealing body made of a flexible material, which has a claw on the outside with a steeply sloping upper surface; A three-branch pipe is provided, which is connected to the other end surface of the closed body, whose other end penetrates into the spiral cylinder at a predetermined position, and whose other end is a level detection opening.

[Effect]

(1) When injecting the liquid into the liquid tank with the above configuration, the flow rate of the liquid increases from the lower end of the inflow pipe, and the liquid flows into the spiral cylinder along the circumferential direction of the spiral cylinder.

Furthermore, a whirlpool centered around the axis of the whirlpool cylinder is created and emerges from the opening at the bottom end.

On the other hand, when the liquid is injected and the liquid level reaches a predetermined level, that is, the level detection opening, the piping that penetrates the spiral cylinder at one end becomes a negative pressure due to the vortex action, and the liquid is sucked up to a predetermined height from the level detection opening. As it is raised, negative pressure acts on the membrane seal, ie the pressure sensor.

The membrane seal is therefore deformed. That is, it outputs a level signal. In this way, it is possible to obtain a highly reliable level sensor that has a simple and compact structure and does not output a level signal until the desired liquid level height, but outputs a level signal when the liquid level reaches a predetermined height.

(2) The above configuration works when liquid is poured into the tank with the valve stem pulled up or pushed up and hooked onto the pawl, and the level detection opening set at the tank's predetermined injection stop level. Explain.

When the liquid level is low, the liquid passes through the valve seat from the central valve, increases the flow rate from the lower end of the inflow pipe with the valve seat, and flows into the spiral cylinder along the circumferential direction of the spiral cylinder. Furthermore, a whirlpool centered around the axis of the whirlpool cylinder is created and emerges from the opening at the bottom end.

On the other hand, when the liquid is injected and the liquid level reaches a predetermined level, that is, the level detection opening, the piping that penetrates the spiral cylinder at one end becomes a negative pressure due to the vortex action, and the liquid is sucked up to a predetermined height from the level detection opening. At the same time, negative pressure acts on the thin film seal. The membrane seal is therefore deformed and the receiver separates from the pawl of the valve stem. Then, the central valve is pushed in the direction of flow by the liquid flowing around it, and is pressed against the valve seat, stopping the flow of liquid.

In this way, a self-closing valve is obtained which has a simple and compact construction, allows liquid to be injected at a normal outflow rate up to the desired liquid level height, and which automatically shuts down when a predetermined height is reached.

〔Example〕

An embodiment of these inventions will be described with reference to FIGS. 1 to 5. In order to avoid redundancy, (1)
Explain the terms ``(2)'' and ``(2)'' side by side.

In FIGS. 1 and 2, the spiral cylinder 10 is closed at its upper end;
The lower part is funnel-shaped and has an opening at the bottom. The upper end of the inflow pipe 11 with a valve seat is closed, and an inflow port 12 is provided at the upper end.

Furthermore, the lower part is bent almost horizontally or diagonally downward,
In addition, the lower end portion 14 is narrowed flat. Also, the lower end portion 14
is coupled to the upper side wall of the spiral cylinder 10 along the circumferential direction of the spiral cylinder 10 with its flat surface parallel to the axis of the spiral cylinder 10.

Further, an annular valve seat 15 is attached to the inner wall of the center portion of the inflow pipe 11 with a valve seat. A circular valve 16 is provided above the valve seat 15. The lower end of the valve shaft 17 is connected to the valve 16, and the upper end passes through the upper surface of the inflow pipe 11 with a valve seat, that is, the upper end, and exits upward through the through hole 18.

A small valve seat 19 is provided around the through hole 18, and a weir 20 is provided around it. Same cough 2 again
A drain hole 21 is provided at the lower end of the 0, and is connected to a drain pipe (not shown). A small valve 22, a lid 23, and a pawl 24 are provided on the valve shaft 17 exiting the through hole 18 in this order from the bottom. The positional relationship between the small valve 22 and the small valve seat is as follows:
The positional relationship between the valve 16 and the valve seat 15 is approximately the same as the rotation.

The lid 23 is surrounded by a weir 20 whose diameter is slightly smaller than the inner diameter of the weir 2o. Further, the upper surface of the claw 24 is steeply sloped. Next, the valve 16 is positioned upwardly away from the valve seat 15, and the catch 2 engages with the pawl 24.
A bellows 26 with a pressure sensor 5 on one end face is provided. Roughly, the three-branch pipe 27 has one end connected to the other end surface of the hollow 26, and the other end, that is, the spiral end 31, penetrates coaxially from the upper end of the spiral cylinder 10 for a predetermined length, and further The other end becomes the level detection opening 28 and is set to the desired liquid injection level 30 in the tank 29.
Note that a tire flam, Fulton tube, etc. may be used instead of the hero. Further, the valve shaft 17 may pass through the upper surface or the lower surface of the inflow pipe 11 with a valve seat.

In the above configuration, there is no liquid in the tank 29.

The effect will be explained when injecting liquid.

When the valve stem 17 is pulled up, it is caught by the pawl 24 or the receiver 25 and stopped. Therefore, as the valve 16 leaves the valve seat 15, the liquid flows in from the inlet 12, passes around the valve 16, is throttled by the flat part 14 at the lower end of the inflow pipe 11 with a valve seat, and increases the flow velocity. It flows into the side wall of the upper end along the circumferential direction. Therefore, in the spiral cylinder 10, the liquid flows out from the lower open end of the spiral and is poured into the tank 29. On the other hand, the liquid leaks upward from the gap between the through hole 18 and the valve stem 17, or is stopped by the small valve 22, the lid 23, and the weir 20, accumulates in the weir 20, and is drained from the drain hole 21 to a pipe (not shown). It is discharged into the tank 29.

Further, when the liquid is injected into the tank 29 and reaches a predetermined level 30, the maximum pressure of the whirlpool on the axis of the whirlpool cylinder 10 is (1
) is the negative pressure shown by the formula. .

P=Po−pv2 11ρυ2 (1) Here, Po Pressure on the side wall of the whirlpool cylinder p Richness of liquid V Speed of inflow into the side wall of the whirlpool cylinder Therefore, the liquid is sucked up from the level detection opening 28 At the same time, this negative pressure (the height of the liquid sucked up) acts on the hollow 26, causing the hollow 26 to contract and move away from the catch 25 and the claw 24 of the valve shaft 27, that is, the pressure sensor A level signal is output. Then, the valve 16 in the center is pushed in the direction of the flow by the liquid flowing around it and moves, and is seated on the valve seat 15, stopping the inflow of liquid. Further, the small valve 22 at the upper end g8 is also interlocked and seated on the small valve seat 19, so that leakage from the through hole 18 is also stopped. At this time, since the diameter of the central valve seat 15 is larger than the diameter of the small valve seat 19 at the upper end, the force acting on the central valve 16 is greater and both valves are maintained in the seated state.

Incidentally, when the valve shaft 17 is rotated by about 180 degrees, the valve shaft 17 can freely move up and down, so if a separate vertical movement mechanism is provided, normal flow rate adjustment can be performed.

In this way, with a simple configuration, the level sensor does not output a level signal until the desired liquid level is reached, but the liquid is injected at the normal flow rate, and when it reaches a predetermined height, it outputs a level signal. You can get an automatic shut-off valve that automatically shuts down depending on the signal.

3 and 4 show the details of the hero 26. From the end surface connected to one end of the three-branch pipe 27, the hero 26
Horizontal bars 32a and 32b extending horizontally above the bellows 6 to the other end surface of the bellows 26 are provided symmetrically. Further, suspension plates 33a, 33b are provided on the receiver 25 of the bellows 26, each having a hole at the upper end through which the horizontal 4$32a, 32b is passed with play.

In this way, the receiver 25 is suspended from the horizontal rods 32a and 32b fixed to the three-branch pipe 27 side, so that it can slide freely in the horizontal direction and is restrained in the vertical direction so that it does not move.

FIG. 5 shows another shape of the three-branch pipe 27.

The position of the level detection opening 28 is relatively high, that is, close to the hollow 26, and as a countermeasure for the case where sufficient negative pressure cannot be obtained, the position of the apex 34 is made higher by bending it upward in the middle.

FIG. 6 shows another example of an inflow pipe with a valve seat.

Wipe off the small valve at the upper end of the embodiment and the small valve seat, and connect the valve stem 17 and the inflow pipe 11a with a valve seat via the sealing bellows 35.
The upper end surface of the valve shaft 17 is attached to the liquid sparrow so that the valve shaft 17 can move up and down.

FIG. 7 shows another embodiment of the spiral cylinder.

The spiral cylinder 10 has a chevron-shaped upper part and a spiral groove 3 on the outer periphery.
A spiral guide frame 36 having a cut length of 7 is provided. Further, the one-branch tube having the spiral end 31 of the three-branch pipe is inserted into a predetermined position from the outside through the lower end of the same spiral guide frame 36.

In this way, the liquid from the upper part is constricted by the chevron portion and the groove 37, increases the flow rate, and flows along the circumferential direction of the spiral cylinder IO.

〔Effect of the invention〕

As explained above, these inventions provide the following effects.

(1) (a) The level sensor operates quickly when the level detection opening is blocked by liquid, so it is easy to identify the liquid level.

(b) Reproducibility of level detection, that is, reliability is high.

(c) There is no need for a constant pressure gas supply system to operate the level sensor.

(2) (a) Since there is no large float or link mechanism that protrudes inside the tank, the structure is simple and compact, so it is highly reliable and inexpensive.

(0) Since it is compact, it is ideal for use as a faucet in baths, etc.

(c) Liquid is poured into the tank at a constant injection rate regardless of the liquid level, so it can be completed in a short time.

(d) Setting the liquid injection level in the tank is easy because the position of the level detection opening can be changed. In addition, level detection works quickly when the level detection opening is blocked by liquid, so the level accuracy after stopping liquid injection is high.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of one embodiment of these inventions, Fig. 2 is a main view taken along line II-II of Fig. 1, and Fig. 3 is a detailed block diagram of a portion of the tongue of Fig. 1. 3
IV-■ Main diagram of the figure, Figure 5 is a configuration diagram of another embodiment of the three-branch pipe in Figure 1, Figure 6 is a configuration diagram of another embodiment of the inflow pipe with valve seat in Figure 1, FIG. 8 is a block diagram of a conventional float type valve, and FIG. 9 is a block diagram of a conventional pressure type level sensor. In the diagram: 1 Lever 2 Float 3 Link mechanism 4 Valve
5 Valve seat 6 Flow path 7 Faucet 8 Tank
9 Liquid level 10 Whirlpool cylinder 11 Inflow pipe with valve seat 12 Inflow port 14 Lower end 15 Valve seat 16 Valve 17 Valve shaft 185 Penetration port 1
9 Small valve seat 20 Cough 21 Drain port 2
2 Small valve 23 Lid 24 Claw 25
Receiver 26 Bellows 27 Three-branch pipe 28
Level detection opening 29 Tank 30 Liquid injection stop level 31 Spiral ends 32a, 32b
Horizontal bars 33a, 33b Hanging plate 34 Vertex 3
5 Sealing seal 36 Spiral guide frame 3
7 Groove 38 Three-branch pipe 39 Pressure detector 40 Faucet procedure amendment Showa 1963 September 9th Patent II: Intimidation of Officials 1 (Cow Display Patent Application No. 013624 No. 2 of 1988, Name of Invention Name: Level sensor and automatic shut-off valve, relationship with the third amendment case Patent application Person's note Place
Address: 37-4, Narita Nishi-21-chome, Suginami-ku, Tokyo 166
Date of amendment order (shipment date) July 29, 1988

Claims (2)

[Claims] (1) A spiral cylinder whose upper end is closed and whose lower end is funnel-shaped;
An inflow pipe that has an inlet at its upper end, has a lower flow path constricted along the flow direction and is bent approximately horizontally or obliquely downward, and whose lower end is joined to the upper side wall of the spiral cylinder along the circumferential direction. and a pressure sensor such as a thin film seal made of a flexible material, one end of which is coupled to the pressure sensor, the other end of which penetrates into the spiral cylinder at a predetermined position, and the other end of which is a level sensing opening. A level sensor equipped with a three-branch pipe. (2) A spiral cylinder whose upper end is closed and whose lower end is funnel-shaped;
The upper end is closed and has an inlet at the upper end, the lower flow path is narrowed along the flow direction and bent approximately horizontally or diagonally downward, and the lower end is attached to the upper side wall of the spiral cylinder,
An inflow pipe with a valve seat that is connected along the circumferential direction and has an annular valve seat in the center, a valve that corresponds to the valve seat, and an inflow pipe that has the same valve at one end and is located above or above the inflow pipe with the valve seat. A valve shaft that penetrates through the lower surface and exits to the outside, and has a claw on the outside with a steeply sloping upper surface; a thin film sealing body made of a flexible material that has a catch on one end surface that engages with the lower surface of the claw; An automatic shutoff valve comprising a three-branch pipe connected to the other end surface of the sealing body, whose other end penetrates into a predetermined position of the spiral cylinder, and whose other end is a level detection opening.