JPH06280781A - Submerged pump - Google Patents

Abstract

PURPOSE:To provide a submerged pump which is constituted to extremely reduce the generation of vibration and noise and provide an increased life despite of a pump discharge rate of flow of the submerged pump. CONSTITUTION:A guide 50a having a first space part 8 formed between the inner peripheral part thereof and the outer periphery of a ball is arranged between a stopper 4a in a delivery port 4 and a valve seat 50. The guide 50a is provided with a plurality of opening parts radially opened and arranged on a periphery and a second space part 9 is formed in the outer peripheral part of the guide and the inner periphery of the delivery port 4 and between the inner periphery of a delivery port 4 and the outer peripheral part of the guide 50a corresponding to the opening part. This constitution causes provision of a submerged pump which performs sharp reduction of the generation of vibration and noise and is provided with an increased life.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submersible pump having a check valve.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view showing a conventional submersible pump disclosed in, for example, Japanese Utility Model Publication No. 62-2312.
Is a blade connected to the motor shaft 2, 3 is a discharge casing,
Reference numeral 4 is a discharge pipe connected to the discharge casing 3, and 5 is a check valve seat mounted over the discharge pipe 4 and the discharge casing 3, and the discharge pipe 4 is sealed with an O-ring 6. Has been done. Reference numeral 7 is a ball-shaped valve element, and the amount of upward movement is regulated by rib-shaped stoppers 4a formed in the inner circumference of the discharge pipe 4 at a regular interval.

Next, the operation will be described. While the submersible pump operation is stopped, a positive pressure is generated inside the discharge pipe 4 due to the natural head, so that the valve body 7 also takes into account its own weight and is brought into close contact with the sealing surface of the valve seat 5 to cause the reverse flow of water into the discharge casing 3. Prevent. Next, when the submersible pump operates, the positive pressure in the discharge casing 3 rises due to the pumping action of the blades 2, and the discharge pipe 4
When the pressure becomes higher than the positive pressure due to the natural water head in the inside, the valve body 7 rises, and water continuously flows from the discharge casing 3 through the opening of the valve seat 5 into the discharge pipe 4 in the arrow direction and is discharged. It

[0004]

Since the conventional backflow prevention device is constructed as described above, during operation of the submersible pump,
The backflow prevention valve 4 has a large head loss when the amount of inflow of water is large, and the head between the valve body 7 and the valve seat 5 and the valve body 7 and the discharge pipe 4 are increased.
When the head difference on the side becomes a certain value or more, the valve body 7 rises until it comes into contact with the stopper 4a and stops at that position. However, as the inflow water amount decreases, the head difference also decreases.
The valve body 7 descends and floats in the discharge pipe 4. Since the inflow water has a spiral flow due to the rotation of the pump, the rotational force is also transmitted to the check valve and intermittently comes into contact with the inner wall of the discharge pipe 4, so that vibration and noise are generated. In the long term, there were problems such as loss of backflow prevention function due to contact wear (short life).

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a submersible pump which has extremely low vibration and noise during operation of the submersible pump and has a long life.

[0006]

A submersible pump according to the present invention includes a pump portion having an upper discharge port, a check valve disposed in the discharge port and having a ball that separates from and contacts a valve seat, and a check valve in the discharge port. In a submersible pump provided with a stopper for restricting an upward movement amount of the ball, an inner peripheral portion between an outer peripheral portion of the ball and the stopper in the discharge port and the valve seat. A guide having a first space is provided, and a plurality of openings that are open in the radial direction are arranged on the circumference of the guide, and the outer peripheral portion of the guide that corresponds to the opening is inside the discharge port. A second space portion is formed between the circumference and the circumference.

Further, the guide is integrally formed on the upper portion of the valve seat so that the outer peripheral diameter dimension on the stopper side is smaller than the outer peripheral diameter dimension on the valve seat side, and the opening portion is located on the stopper side. It was formed.

Further, the guide is integrally formed on the upper portion of the valve seat, and the outer peripheral portion thereof has a taper shape in which the diameter dimension of the outer peripheral portion on the stopper side is smaller than the diameter dimension of the outer peripheral portion on the valve seat side. However, the opening is formed on the stopper side.

Further, the stopper is made of plastic and is provided with a cylindrical portion and a positioning portion formed on an inner peripheral portion of an upper portion of the cylindrical portion, and the plastic guide and the plastic valve are provided in the cylindrical portion. A seat is arranged so that the cylindrical portion cuts off a part of the inner circumference of the discharge port from water and the cut-off portion is formed separately.

Further, the opening of the guide is expanded outward in the radial direction.

[0011]

In the submersible pump according to the present invention, while the submersible pump is operating, the inflow of water becomes a spiral flow due to the rotation of the pump, and passes through the opening hole of the valve seat toward the check valve, but is cylindrical outside the valve body. By providing multiple openings on the circumference of the upper part and reducing the gap between the inner diameter of this opening and the outer diameter of the valve body, the flow velocity at the time of small inflow water is increased and the head loss is increased. The valve body rises, contacts the stopper, and stands still. Further, even when the minimum amount of inflow water is passed through the plurality of openings provided in the guide, the swirling flow is rectified, so that the valve body does not rotate, and the rectified water flows outward from the openings. Therefore, the valve body floats stably in the approximate center.

[0012]

【Example】

Example 1. FIG. 1 is a sectional view showing an embodiment of the present invention, in which 1 to 4 and 6 to 7 are exactly the same as the conventional device. Reference numeral 50 is a valve seat having a guide 50a protruding upward through the outer periphery of the valve body 7 and the first space portion 8. As shown in FIG. 2, the guide 50a has a plurality of notched openings 50b. Are formed. A second space 9 is formed between the guide 50 a and the inner circumference of the discharge pipe 4.

With the above-mentioned construction, when the submersible pump is not operating, a positive pressure is generated inside the discharge pipe 4 by the natural head, so that the valve body 7 takes into account its own weight and the valve seat 5
It adheres to the sealing surface of No. 0 and prevents the backflow of water into the discharge casing 3. Next, when the submersible pump is operated, the pressure in the discharge casing 3 rises due to the pump action, and when the pressure becomes higher than the positive pressure due to the natural head of the water in the discharge pipe 4, the valve body 7
Rises and water is discharged from the opening of the valve seat 50 in the arrow direction to
Continuously flows into the inside. The valve body 7 is a stopper 4 even with a small amount of water.
It comes into contact with a, stands still, and floats in a stable state even when the amount of water is extremely small. By the way, the space 9 between the inner circumference of the discharge pipe 4 and the guide 50a further disperses the flow direction of the inflow water from the opening 50b to the surroundings, so that the spiral flow due to the rotation of the blade is rectified. Will be done. That is, the inflow water that has flowed in between the valve body 7 and the valve seat 50 is
First, the flow is divided into the opening 50b of the guide 50a to divide the spiral flow, and further, the water passage area in the space 9 is suddenly expanded to reduce the resistance to water loss, and the flow is reliably rectified.

Example 2. In the first embodiment, the guide 50a projects upward, but as shown in FIGS.
A thick portion 50c that forms a fitting portion with the discharge pipe 4 at the bottom of a
By forming the, it is possible to improve the strength of the guide 50a.

Example 3. In the second embodiment, the guide 50a projects from the thick wall portion 50c with the same thickness. However, as shown in FIG. 5, by providing the tapered portion 50d that is inclined from the outer peripheral portion of the thick wall portion 50c and has a small diameter, the valve seat The 50 can be easily inserted into the discharge pipe 4.

Example 4. In FIG. 6, the discharge pipe is composed of a first discharge pipe 40 made of metal and a second discharge pipe 41 made of plastic as separate bodies, and they are connected by, for example, bolts (not shown). In the figure, reference numeral 41a is a stopper fitted in the first discharge pipe 40 and is continuous with the tubular portion 41b. Reference numeral 10 is an O-ring that seals the first discharge pipe 40 and the stopper 41a. In this configuration, the second of the discharge pipes
It is possible to prevent the generation of rust on the discharge pipe 41 portion and prevent the valve seat 5 from being clogged.

Embodiment 5. FIG. 7 shows the opening 50b of the valve seat 50.
In this configuration, the expanding portion 50e is provided toward the outer periphery in the radial direction, and the water passage area is the opening portion 50b, and the water passage area is further rapidly expanded, and the inflow water is rectified effectively.

[0018]

As described above, according to the present invention, the simple structure in which the guide is provided on the outer side of the ball-shaped valve body makes vibration and noise due to rotation and contact of the valve body during pump operation extremely low. It is possible to obtain a long-life product.

[Brief description of drawings]

FIG. 1 is a sectional side view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of the present invention.

FIG. 3 is a sectional side view showing a second embodiment of the present invention.

FIG. 4 is a perspective view showing a main part of the present invention.

FIG. 5 is a sectional side view showing a third embodiment of the present invention.

FIG. 6 is a sectional side view showing a fourth embodiment of the present invention.

FIG. 7 is a cross-sectional plan view of essential parts showing a fifth embodiment of the present invention.

FIG. 8 is a sectional side view showing a conventional device.

[Explanation of symbols]

 4 Discharge port 4a Stopper 7 Valve body 8 1st space part 9 2nd space part 40 1st discharge pipe 41 2nd discharge pipe 41a Stopper 41b Cylindrical part 50 Valve seat 50a Guide 50b Opening 50c Thick part 50d Tapered part 50e Expanded part

Claims (5)

[Claims] 1. A pump portion having an upper discharge port, a check valve disposed in the discharge port and having a ball that comes into contact with and separates from a valve seat, and a check valve provided in the discharge port for increasing the amount of upward movement of the ball. In a submersible pump including a stopper for restricting, a guide having an inner peripheral portion forming a first space portion between the stopper and the valve seat in the discharge port is provided, In this guide, a plurality of openings that are open in the radial direction are arranged on the circumference, and the outer peripheral portion of the guide corresponding to the opening has a second space between the inner periphery of the discharge port. Submersible pump characterized by being formed. 2. The guide is integrally formed on an upper portion of the valve seat so that a diameter dimension of an outer peripheral portion of the stopper side is smaller than a diameter dimension of an outer peripheral portion of the valve seat side, and the opening is disposed on the stopper side. It is formed, The 1st thing characterized by the above-mentioned.
Submersible pump according to item. 3. The guide is integrally formed on an upper portion of the valve seat, and an outer peripheral portion of the guide is tapered so that a diameter of an outer peripheral portion of the stopper side is smaller than a diameter of an outer peripheral portion of the valve seat side. The submersible pump according to claim 1, wherein the opening is formed on the stopper side. 4. The stopper is formed by a cylindrical portion made of plastic and a positioning portion formed on an inner peripheral portion of an upper portion of the cylindrical portion, and an upper guide made of plastic and the valve seat made of plastic are provided in the cylindrical portion. 2. The submersible pump according to claim 1, wherein said cylindrical portion blocks a part of the inner circumference of said discharge port from water and separates the blocking part. 5. The submersible pump according to claim 1, wherein the opening of the guide is expanded radially outward.