JPS5896184A - Air supply device of pump - Google Patents

Abstract

PURPOSE:To make the air supply device of a pump in a small size with less number of parts as well as enhance its reliability and facilitate assembly, by forming the suction part of this air supply device with a bevel type check valve, and the bottom of a case functioning both as valve seat and suction hole in communication with the atmosphere. CONSTITUTION:The suction part of an air supply device for a pump is composed of suction holes 14-16 in communication with the atmosphere and with their insides formed at the bottom of the case 10, and a bevel type check valve 60 installed at the case so as to enclose these suction holes 14-16 from inside the case 10. Accordingly, this bevel type check valve 60 shall be so arranged that the case bottom as valve seat and the periphery of bevel part of the valve 60 as valve element mate with each other in a line contact, in case the check valve 60 is shut. Thereby a pushing spring, valve seat and sealing member are no more necessary as essential in a conventional type system, that will assure a small-sized, highly reliable air supply device with easiness to fabricate.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air supply device for a pump, and more particularly to an improvement in the air intake device.

A prior art pump air supply system is shown in FIG. This air replenishment device is similar to the one for which a patent application was filed in patent application No. 91775 of 1982, dated July 7, 1980.

This prior art air supply device supplies negative pressure generated on the suction side of the pump when the pump is started to a negative pressure chamber 32 formed by the diaphragm 30 and the cover 20, and then inverts the diaphragm 30 to the cover 20 side. The air is sucked into the device consisting of the air intake hole 1 provided in the case 10, the valve seat 2, the ball 3 which is the valve body, the push spring 4 and the cap 5, and into the air chamber 31 when the pump number is stopped. The pressure tank is replenished by pushing out the air through the nozzle portion 5o to the discharge side of the pump, that is, to the pressure tank side of the pump.

In this prior art air replenishment device, the intake device portion is located at the valve seat 2.
, a ball 3, a push spring 3, and a cap 5, which has a large number of parts and cannot be miniaturized, has a complicated structure, has many sealing parts, has low reliability, and requires a lot of time to assemble.

In addition, since the valve body is a ball, the sliding contact with the valve seat is a surface contact, and compared to a line contact, the valve body lacks the 7-hole property when the valve is closed.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air replenishing device for a pump whose intake device section can be configured simply.

The present invention is characterized by an intake hole that communicates with the atmosphere by forming the intake device part of the air supply device of the pump in the bottom of the case, which has a bowl-shaped inner side, and an umbrella attached to the case so as to cover the intake hole from the inside of the case. It consists of a type check valve.

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings. A diaphragm 30 made of an elastic body is airtightly held between a case 10 whose inside is so-called bowl-shaped and a periphery between a cover 20 that covers an inside opening of the case 10.

An air chamber 31 is formed between the case 10 and the diaphragm 30. Further, a negative pressure chamber 32 is formed between the cover 20 and the diaphragm 30.

A diaphragm 3 is placed between the diaphragm 30 and the cover 20.
A coil-shaped spring 40 is disposed to press 0 toward the case 10 side.

A communication hole 11 is bored above the case 10 forming the air chamber 31 to communicate with the discharge pipe of the pump via the nozzle part 50.

The nozzle portion 50 is installed by being inserted into the discharge pipe of the pump.

This nozzle part 50 includes a nozzle case 51, a groove on the upper surface of the nozzle case 51, a notch 52 provided at the lower end of the nozzle case 51, a nozzle hole 53 that communicates with the communication hole 11 of the case 10, and an inside of the nozzle case 51. The ball valve body 54 is movably held between the notch 52 and the nozzle hole 53, and has a specific gravity slightly smaller than that of well water.

A recess 12 is formed in the inner bottom of the case 10.

A fitting hole 13 is formed in the center of this recess 12, as shown in FIG. Around this fitting hole 13, as clearly shown in FIG.
is formed.

FIG. 3 clearly shows a cross section of the umbrella check valve 60.

This umbrella-type check valve 60 consists of a so-called umbrella-shaped valve body 61, a convex portion 62 formed on the head of the valve body 61, a rod-shaped valve stem 63, and a stopper portion 64 formed on the valve stem 63 with a large diameter. , is integrally molded from an elastic body.

The diameter of the distal end side of the stopper portion 64 of the valve stem 63 is equal to that of the fitting hole 13.
It is formed smaller than the diameter of. Stopper part 6 of valve stem 63
4 and the valve body 61 is formed to be approximately equal to the diameter of the fitting hole 13.

This umbrella-type check valve is constructed by inserting the tip of the valve stem 63 into the fitting hole 13 from the inside of the case lO, press-fitting and penetrating the stopper part 64, and connecting the stopper part 64 of the valve stem 63 and the valve body 61. It is attached by fitting into the fitting hole l3 between the holes.

This umbrella-type check valve 60 is arranged so that when the valve is closed, the umbrella-shaped periphery of the valve body 61 and the recess 12 of the case 10, which serves as a valve seat, come into contact.

The convex portion 62 prevents the umbrella-shaped valve body 61 from being pushed by the diaphragm 30 when the valve is closed, causing it to invert (a so-called upside-down state of an umbrella) and prevent the valve from opening.

In this way, the intake device of the air replenishment device has an umbrella-type check valve 6.
0, it is formed by the intake holes 13, 14, 15 and the bottom of the case 10, which also serves as a valve seat.

The cover 20 is provided with a negative pressure chamber 3 that receives negative pressure from the suction side of the pump.
A connecting portion 21 is formed for connecting a pipe to be supplied to 2.

Next, the operation of the pump air replenishing device configured as described above will be explained.

First, when the pump starts, water is sucked into the air chamber 31 from the nozzle section 50. Then, the ball valve body 52 moves smoothly from its position in the groove on the upper surface of the nozzle case 51 to the nozzle hole 53 side by riding the water flow toward the nozzle hole 53, and comes into close contact with the valve seat of the nozzle hole 53. close.

When the nozzle hole 53 is closed by the ball valve body 52, the flow of water from the nozzle hole 53 into the air chamber 31 is blocked.

The inflow of water into the air chamber 31 is blocked, and by supplying the negative pressure generated on the suction side of the pump to the negative pressure chamber 32, the diaphragm 30 is reversed to the cover 20 side against the pressure of the spring 40. let

This inversion of the diaphragm 30 makes the space in the air chamber 31 narrower, and the pressure in the air chamber 31 decreases. Then, this air chamber 31 draws air into the intake hole 1 due to the pressure difference with the atmosphere.
4, 15, and 16 into the air chamber 31 through a passage formed in an umbrella-shaped reverse opening.

Air in the atmosphere flows into the air chamber 31, and this air chamber 31
When the pressure becomes close to atmospheric pressure, the umbrella-type check valve 60 releases the spring 4
It returns to the closed state again by pressing 0.

Next, when the pump stops, the pressure on the suction side of the pump increases, the negative pressure that is pulling the diaphragm 3o toward the cover 20 decreases, and the diaphragm 30 moves toward the case 10 again due to the compression of the spring 4o.

At this time, the air stored in the air chamber 31 is transferred to the communication hole 11.
, is discharged into the discharge pipe through the nozzle hole 53, and further fed into the pressure tank of the pump.

According to the embodiment described above, compared to the intake device section according to the prior art described above, parts such as a push spring, a valve seat, a cap, a sealing member, etc. are unnecessary due to the use of the umbrella-type check valve 60 in the intake device. As a result, a compact air replenishment device with few sealing points, high reliability, and can be assembled in a short time can be obtained.

Still, since the valve body of the check valve of the conventional air replenishment device used the pole 3, the valve body and the valve seat 2 were in surface contact. In the present invention, since the umbrella type check valve 60 is used as the check valve, the valve body and the valve seat are in line contact, and the pressure spring 4 is not required for opening and closing the valve, so that the opening and closing pressure of the valve can be reduced. As shown in FIG. 6, a large intake amount of air can be obtained with a small negative pressure.

FIG. 6 shows the relationship between the amount of intake air in the air chamber 31 and the negative pressure supplied to the negative pressure chamber 32 in the air replenishing device of the present invention and the conventional pump. Curve A shows the intake air amount of the pump air replenishing device of the present invention, and curve B shows the intake air amount of the conventional pump air replenishing device.

In addition, since the valve body 61 of the umbrella-type check valve 60 is placed in the recess 12 at the bottom of the case 10, sand in the well water does not get caught between the valve body and the valve seat, and the valve sealing property is improved. never weakens.

As explained above, according to the present invention, by using an umbrella-type check valve in the intake device section, the number of parts is reduced, the size is reduced,
A highly reliable pump air supply device is obtained.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of a conventional pump air supply device, Figure 2
The figure is a vertical sectional view of an air supply device for a pump showing an embodiment of the present invention, FIG. 3 is a partially enlarged view of FIG. 2, FIG. 4 is a left side view of FIG. 2, and FIG. The right side view of the figure and FIG. 6 are intake characteristic diagrams for negative pressure of the air replenishing device for a pump according to the present invention and the air replenishing device for a conventional pump. 10...Case, 12...Recess, 14, 15, 16
...Intake hole, 20...Cover, 30...Diaphragm, 40...Spring, 50...Nozzle device, 60...
・・Umbrella type check 'JF/ Figure '42 (21 Kaya 30 T4 diagram

Claims (1)

[Claims] 1. A diaphragm is airtightly sandwiched between a case having a bowl-shaped inner side and a cover covering an inner opening of the case, so that the case and the diaphragm are connected to the discharge side of the pump. A negative pressure chamber communicating with the suction side of the pump is formed between the cover and the diaphragm, and a spring is disposed between the diaphragm and the cover to press the diaphragm toward the case side. In the air replenishment device for a pump, the case is provided with a check valve that performs an intake action in response to the pressure difference between the pressure inside the air chamber and the atmospheric pressure, and an intake hole communicating with the atmosphere is provided at the bottom of the case. and the check valve is an umbrella-type check valve, and the valve body of the umbrella portion made of an elastic body of the umbrella-type check valve covers the intake hole from the inside of the front case, and the umbrella-type check valve has an umbrella-type check valve. An air supply device for a pump, characterized in that a valve stem of a valve is fitted into the bottom of the case, and a valve seat is formed around the intake hole in the bottom of the case. 2. In the air replenishment device for a pump according to claim 1, when the umbrella-type check valve is closed, the bottom of the case, which is a seat, and the umbrella part of the umbrella-type check valve, which is a valve body. An air replenishing device for a pump, characterized in that the umbrella-type check valve is arranged so that it makes line contact with the peripheral edge. 3. In the air supply device for a pump according to claim 1, a recess is formed in the bottom of the case, the intake hole is formed in the recess, and the umbrella-shaped check valve is arranged. A pump air supply device featuring: