JPH09228983A - Pump device - Google Patents

Abstract

(57) Abstract: A pump device for supplying air to a tank when a float valve that is seated on and released from a valve seat of an air supply device is sealed, when the float valve is seated on the valve seat. To ensure the air supply to the tank. A valve seat surface on which a float valve is seated is a valve seat surface having a radius of curvature, and a water film in a gap between the valve seat surface and the outer circumference of the float valve enhances sealing performance to the tank. To ensure air supply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump device having an air supply device for supplying air into a water storage tank.

[0002]

2. Description of the Related Art In a conventional pump device of this type, since the valve seat of an air supply float valve is formed by resin molding in a taper shape, the float is caused by the occurrence of sink marks or the adhesion of foreign matter during resin molding. Airtightness is reduced by reducing the sealing performance between the valve and the valve seat, and by rolling the float valve, the sealing performance is similarly reduced and water stored in the water storage tank enters the air supply device. There was a problem that the amount of outside air introduced into the device was small, and as a result, the supply of air into the water storage tank was insufficient.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a seal between a float valve and a valve seat of a pump device in which a valve seat of a float valve of an air replenishing device for replenishing air in a water storage tank is resin-molded. To ensure air supply to the water storage tank, and to move the float valve smoothly, that is, to make the operation smooth and quick, to reduce the amount of movement of the diaphragm, and as a result, The purpose is to extend the service life.

[0004]

In the pump device according to the present invention, the valve seat of the float valve that opens and closes the communication passage between the air supply device and the inside of the water storage tank is a valve seat surface having a radius of curvature. Is.

Further, the radius of curvature of the valve seat of the float valve is 1.1 to 1.2 times the radius of curvature of the float valve.

The specific gravity of the float valve is less than 1.

Further, a taper portion that shrinks toward the valve seat portion of the float valve chamber is provided, and in succession to the taper portion,
A valve seat surface having a radius of curvature of 1 to 1.2 times the radius of curvature of the float valve is formed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. 1 is a diagram showing a schematic configuration of a first embodiment of the present invention, FIG. 2 is a cross-sectional view of an air supply device section of FIG. 1, and FIG. 3 is a cross-sectional view of a main part of FIG.

First, referring to FIG. 1, a schematic structure of the pump device will be described. 100 is an electric pump body, 20
Reference numeral 0 is a tank for supporting the pump body 100, which temporarily stores pumped water of the pump body 100 so that an air layer described later is formed on the pump body 100 and discharges the stored water from a discharge port (not shown). Is. 300 is an air replenishing device that replenishes air into the tank 200 in response to the operation and stop of the pump body 100, and 400 is provided on the suction side of the pump body 100 to respond to the operation and stop of the pump body 100. It is a pipe that communicates with the air supply device 300.

Next, the specific structure of the air supply device 300 will be described with reference to FIG. Reference numeral 301 denotes a resin-molded bowl-shaped case having a through hole 301a at the bottom thereof.
Part of the radius of curvature of the ball-shaped float valve described later is 1.
Float valve chamber 3 having a valve seat surface 301b having a double radius of curvature
01c, and an air introduction hole 301d in which an air introduction valve to be described later is arranged in the outer peripheral edge portion is formed with a communication groove 301e that connects the through hole 301a and the air introduction hole 301d.

Reference numeral 302 denotes a resin-molded bowl-shaped lid arranged so as to cover the opening of the case 301, and has a through hole 302a communicating with the pipe 400 formed at the bottom thereof.

A diaphragm 303 is sandwiched between a case 301 and a lid 302, and divides the case 301 side into a first chamber 304 and the lid 302 side into a second chamber 305.

Reference numeral 306 is a compression coil spring, one end of which is in pressure contact with the bottom of the lid 302 and the other end of which is in pressure contact with one side of the diaphragm 303 via a spring receiver 307. When the pump body 100 is stopped, the other side of the diaphragm 303 is indicated by a solid line. In addition, the case 301 is configured to be in pressure contact with the inner surface of the case 301.

The case 301, the lid 302, the diaphragm 303, the compression coil spring 306, and the spring receiver 307 constitute the main body of the air supply device.

500 is planted in the upper part of the tank 200,
A cylindrical joint that connects the first chamber 304 of the air supply device 300 that is detachably attached to the upper end to the inside of the tank 200, and 600 is fitted to the inner circumference of the cylindrical joint, and the lower end thereof and the inner bottom surface of the tank 200. And a pipe configured so that a predetermined space is formed between the pipe and the pipe.

Reference numeral 700 denotes a ball-shaped float valve having a specific gravity of less than 1 which is movably arranged in the float valve chamber 301c.
The valve seat surface 301b is configured so that it can be seated on and taken off from the valve seat surface 301b.

Reference numeral 800 denotes a mesh type float valve receiver which is disposed below the float valve chamber 301c and which restricts the fall of the float valve 700 to a predetermined position. By receiving the float valve 700 by the float valve receiver 800, the float valve The valve 700 is configured so that the first chamber 304 and the inside of the tank 200 are surely communicated with each other without blocking the upper end of the pipe 600.

Reference numeral 900 is a ball-shaped valve provided in the air introducing hole 301d, 1000 is a valve seat provided at the lower end of the air introducing hole 301d, and an air introducing hole 1001a is formed at the center. is there. Reference numeral 1100 denotes a lid screwed to the outer peripheral portion of the air introduction hole 301d to hold the valve seat 1000, and has an air introduction introduction hole 1101a which is concentric with the air introduction introduction hole 1001a at the center thereof. .

Reference numeral 1200 is a compression coil spring for urging the valve 900 toward the valve seat 1000 side. When the air is introduced, the valve 900 is allowed to move against the spring pressure of the spring 1200, and when the air is not introduced, the valve 900 is opened. The seat 1000 is configured to be in pressure contact with the seat 1000 to close the air introduction path.

Reference numeral 1300 denotes a pressure switch arranged on the tank 200, which operates when the pressure of the air layer 1500 formed above the water 1400 in the tank 200 reaches a predetermined value to operate the pump body 100. When the pressure is stopped and the pressure drops below a predetermined value, switching is performed so that the pump body 100 can be operated.

In the pump device thus constructed, when the pump body 100 is operated, pumped water is pumped into the tank 20.
0 is temporarily stored in the tank 0, discharged from a discharge hole (not shown) as necessary, and when the pressure of the air layer 1500 in the tank 200 reaches a predetermined value, the pressure switch 1300 operates and the operation of the pump body 100 is stopped. It

When the suction side of the pump body 100 becomes a negative pressure due to the operation of the pump body 100, the second chamber 305 of the air replenishing device 300 becomes a negative pressure through the pipe 400, and the diaphragm 303 has a case as shown by a solid line. 301
From the state of being in close contact with the inner wall, it is reversed to the lid 302 side against the spring pressure of the spring 306.

When the diaphragm 303 is inverted, the first chamber 304 also has a negative pressure. At this time, when the water level of the stored water in the tank 200 is L1, that is, above the lower end of the pipe 600, the stored water rises in the pipe 600. Then, the float valve 700 is pressed against the valve seat 301b by the buoyancy, and the stored water is prevented from entering the first chamber 304.

Further, by reversing the diaphragm 303 toward the lid 302, the valve 900 resists the spring pressure of the spring 1200 and the valve seat 1
000, outside air is introduced into the first chamber 304 and the inside of the first chamber 304 becomes atmospheric pressure, the valve 900 is pressed against the valve seat 1000 by the spring pressure of the spring 1200, and the air introduction path is closed.

In such a state, the pump body 10
When 0 is stopped, the pressure on the suction side of the pump body 100 becomes the same as that in the tank 200, and the diaphragm 303 is inverted by the spring pressure of the spring 306 to the case 301 side as shown by the solid line and introduced into the first chamber 304. The air thus pushed pushes down the float valve 700 and passes through the pipe 600 to the tank 200.
It is replenished inside.

The water level of the tank 200 is L2, that is, the tank 2
When an air layer is formed between the water surface of the stored water in 00 and the lower end of the pipe 600, the air in the tank 200 is introduced into the first chamber 304 through the pipe 600, and thus the air introduction hole 301d. Therefore, no new outside air is introduced into the first chamber 304, and thus no more than necessary outside air is introduced into the tank 200.

By the way, when the outside air is introduced into the first chamber 304, the float valve 700 comes into contact with the valve seat 301b and a small gap is formed in a predetermined length along the surface of the float valve 700. The surface tension of the water film due to the water storage introduced from the tank 200 into the gap becomes larger than before, and as a result,
It is possible to solve the problem that the stored water in the tank 200 enters the first chamber 304 and the air supply amount of the air supply device decreases as in the conventional case.

Further, by virtue of this construction, the swing of the float valve 700 becomes smaller than that of the conventional float valve 7
The sealing property of the contact portion between 00 and the valve seat 301b is stabilized.

Further, with this structure, the valve seat 3
Even if the 01b portion is resin-molded and some sink marks occur during the molding, the sealing property of the contact portion between the float valve 700 and the valve seat 301b is improved as compared with the conventional one, and as a result, the air supply device is provided. Thirty
It has been confirmed that the conventional inconvenience that the air supply amount of 0 decreases is solved.

The radius of curvature of the valve seat surface 301b is 1.times. Of the radius of curvature of the float valve 700 as in the first embodiment.
The number is not limited to twice, and preferably 1.1 to
It is 1.2 times.

Embodiment 2 4 shows Embodiment 2 of the present invention, in which a valve seat surface 301f of a float valve 700 is shown.
Has a radius of curvature equal to the radius of curvature of the float valve 700, the sealing property of the contact portion between the float valve 700 and the valve seat surface 301f is further improved, the resin seat measures against the valve seat surface 301f, and the float valve 700 swings. It is extremely effective in preventing movement.

Embodiment 3. FIG. 5 shows Embodiment 3 of the present invention, in which a taper portion 301g is provided to reduce toward the valve seat portion of the float valve chamber 301c, and the taper portion 301g is continuous with the radius of curvature of the float valve 700. The valve seat surface 301f having a radius of curvature of (1.0 times) is formed, and in addition to improving the sealing property of the contact portion between the float valve 700 and the valve seat surface 301f, the valve seat surface of the float valve 700 The movement to 301f becomes quick and the diaphragm 30
There is little time delay from the start of reversing the third chamber to the side of the second chamber 305, and the air supply becomes more reliable.

Further, since the time delay is reduced,
The moving amount of the diaphragm 303 can be set to a small amount, which is extremely advantageous in terms of the bending life of the diaphragm 303.

[0034]

Since the present invention is constructed as described above, it has the following effects. In the invention of claim 1, the valve seat surface of the float valve is a valve seat surface having a predetermined radius of curvature, so that the sealability between the float valve and the valve seat surface is improved as compared with the conventional case. It is possible to solve the problem of deterioration of air replenishment performance that has conventionally occurred due to deterioration of the sealing property due to occurrence of sink marks during resin molding of the valve seat surface and adhesion of foreign matter to the float valve and valve seat surface. .

Further, in the invention of claim 2, the radius of curvature of the valve seat surface is 1.1 to 1.2 times the radius of curvature of the float valve, so that the float valve and its valve seat surface. While maintaining the airtightness, the float valve can be detached from its valve seat surface, that is, the operation of the float valve can be ensured.

Further, in the invention of claim 3, since the specific gravity of the float valve is less than 1, the movement of the float valve to the valve seat side can be made faster than the movement of the stored water in the tank, and therefore the above-mentioned There is an effect that it is possible to reliably prevent the stored water from entering the air replenishing device, and to reliably eliminate the conventional problem that the air replenishing amount of the air replenishing device decreases.

Further, according to the invention of claim 4, a taper portion which is reduced toward the valve seat portion of the float valve chamber is provided, and the taper portion has a radius of curvature of 1 which is continuous with the taper portion.
Since a valve seat surface with a radius of curvature of ~ 1.2 times is formed, the float valve moves quickly to the valve seat surface, and there is little time delay with the start of reversing the diaphragm to the first chamber side, Supply will be more reliable.

Further, since the time delay is reduced,
The amount of movement of the diaphragm can be set to be small, and it is extremely advantageous in terms of the bending life of the diaphragm.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the air supply device according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of essential parts of Embodiment 1 of the present invention.

FIG. 4 is a cross-sectional view of essential parts of Embodiment 2 of the present invention.

FIG. 5 is a cross-sectional view of the essential parts of Embodiment 3 of the present invention.

[Explanation of symbols]

100 pump body, 200 water tank, 300 air supply device, 301b valve seat surface, 303 diaphragm,
304 first chamber, 305 second chamber, 700 float valve, 900 valve.

Claims (4)

[Claims] 1. A pump main body, which temporarily stores pumped water of the pump main body so that an air layer is formed above the pump main body,
A water storage tank having a discharge port for discharging the stored water, a diaphragm is arranged between the case and the cover, and is partitioned into a first chamber and a second chamber, and the first chamber communicates with the water storage tank. A second chamber communicates with the suction side of the pump body and supplies air so as to form the air layer in the water storage tank; an air replenishing device body; 2 an air introduction valve for introducing outside air into the first chamber when deformed to the chamber side, and the air introduction valve closes communication between the inside of the water storage tank and the first chamber when introducing outside air, A ball-shaped float valve is provided which operates so that the inside of the water storage tank and the first chamber are communicated with each other when the deformation is restored when the operation is stopped, and the air in the first chamber is pumped into the tank. Pump unit with seat formed by resin molding In the pump apparatus, wherein a valve seat of the float valve and the valve seat having a radius of curvature. 2. The pump device according to claim 1, wherein the radius of curvature of the valve seat of the float valve is 1.1 to 1.2 times the radius of curvature of the float valve. 3. The pump apparatus according to claim 1, wherein the specific gravity of the float valve is less than 1. 4. A taper portion that shrinks toward the valve seat portion of the float valve chamber is provided, and a valve seat surface having a radius of curvature of 1 to 1.2 times the radius of curvature of the float valve is provided continuously to the taper portion. The pump device according to claim 1, wherein the pump device is formed.