JPH0560086A - Self-suction type pump - Google Patents

Abstract

PURPOSE:To stabilize self-suction performance by disposing independently of return channels a cylinder portion for obtaining a differential pressure. CONSTITUTION:A cylinder portion 40 which is communicated at one end thereof with a pump chamber 18 while at the other end thereof with an air/water separating chamber is disposed independently of return channels 38a, 38b. A piston portion is inserted into the cylinder portion 40. If a pressure difference of a fixed value or larger between the inside (the pump chamber 18) of the cylinder portion 40 and the outside (the air/water separating chamber 32) of the piston portion is generated in a transition stage from self-sucking operation to pumping operation, the piston portion is drawn inside the cylinder portion 40 so that the return channels 38a, 38b are closed by valve portions 48a, 48b formed at the upper end of the piston portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-priming pump, and more particularly to, for example, water discharged from a pump chamber outlet into a steam / water separating chamber is returned to a pump chamber through a return channel to thereby provide a self-priming action. In addition, the present invention relates to a self-priming pump in which the return water channel is closed during the pumping operation.

[0002]

2. Description of the Related Art One example of this type of self-priming pump is disclosed in, for example, Japanese Patent Laid-Open No. 59-103987. In this conventional technique, a plunger is attached to the inlet of the return water channel via a coil spring, and the plunger is opened / closed by utilizing the pressure difference between the pump chamber and the steam separation chamber.

[0003]

However, in the above-mentioned prior art, since the plunger and the coil spring serve as a resistance against water, it is not possible to quickly return a sufficient amount of water into the pump chamber during self-priming operation. However, there is a problem that the flow of water taken into the return water channel affects the operation of the plunger and stable self-priming performance cannot be obtained.

Therefore, a main object of the present invention is to provide a self-priming pump capable of obtaining more stable self-priming performance.

[0005]

According to the present invention, there are provided a pump chamber having an inlet and an outlet, in which an impeller is housed, a steam separation chamber for taking in water discharged from the outlet, and a pump chamber. A return water channel that communicates with the air / water separation chamber, a cylinder portion that is provided independently of the return water channel, and has one end that communicates with the pump chamber and the other end that communicates with the water / water separation chamber , And a valve provided on the piston part and for opening and closing the return water passage, and when the pressure difference between the pump chamber and the water-water separation chamber exceeds a certain level, the piston part is drawn into the cylinder part. It is a self-priming pump with a valve closing the return channel.

[0006]

In the self-priming operation, the water discharged into the air / water separation chamber is returned to the pump chamber through the return water passage and is again discharged into the air / water separation chamber including air. When there is a certain pressure difference between the steam / water separation chamber and the pump chamber due to the fact that the water / water separation chamber is filled with water, etc., the piston part is pulled into the cylinder part and the valve provided in the piston part returns. Close the waterway.

[0007]

According to the present invention, since the differential pressure for opening and closing the valve is obtained by the cylinder portion provided independently of the return water channel, the flow of water taken into the return water channel is controlled by the valve. It is possible to reduce the influence on the opening / closing operation of the. Also,
The resistance of water taken into the return water channel can be reduced, and a sufficient amount of water can be quickly returned to the pump chamber during the self-priming operation. Therefore, more stable self-priming performance can be obtained as a whole.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the embodiments below with reference to the drawings.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a self-priming pump 10 of this embodiment includes a first casing 12, a second casing 14 and a third casing 16. A pump chamber 18 is formed inside the first casing 12, and an impeller 22 attached to a rotary shaft 20 extending from a rotor (not shown) is housed inside the pump chamber 18. A pump chamber inlet 24 is formed at the center of the upper portion of the pump chamber 18, and a pump chamber outlet 26 is formed extending upward from the peripheral portion of the pump chamber 18. A water passage 28 that communicates with the pump chamber inlet 24 is formed to extend in a substantially “L” shape from the boundary between the first casing 12 and the second casing 14 to the peripheral edge of the third casing 16. A suction port 30 is formed at the upper end of the water channel 28, that is, at the upper part of the third casing 16. Further, a steam / water separation chamber 32 is formed inside the third casing 16, and a water passage 3 for connecting the steam / water separation chamber 32 and the pump chamber outlet 26 is provided at a peripheral portion of the second casing 14.
4 is formed extending obliquely. A discharge port 36 is formed in the upper portion of the steam separation chamber 32.

Then, in the first casing 12 and the second casing 14, as clearly understood from FIGS. 2 and 3, return water passages 38a and 38b for connecting the pump chamber 18 and the steam separation chamber 32 are formed. .. Note that the number of return water channels may be only one, or may be three or more. Second
A cylinder portion 40 is formed at an intermediate portion between the return water channels 38 a and 38 b of the casing 14, and the first casing 12
A hole 42 that communicates the cylinder portion 40 and the pump chamber 18 is formed in the. Then, the piston portion 46 is inserted into the cylinder portion 40 via the coil spring 44. Valve portions 48a and 48b are formed at the upper end of the piston portion 46 so as to project in the horizontal direction and respectively correspond to the return channels 38a and 38b. Also,
The upper surface of the second casing 14 has a valve portion 48, respectively.
Support members 50a and 50b are formed to contact the sides of a and 48b to prevent rotation of valve portions 48a and 48b. Further, a substantially rod-shaped pressing member 52 that extends downward from the ceiling of the water / water separation chamber 32 and prevents the piston portion 46 from falling off is formed.

The casings 12 to 16 are connected to each other via a gasket 54 by bolts and nuts (not shown). In operation, when a current is passed through a stator (not shown) to rotate the impeller 22, water and air are mixed in the pump chamber 18, and the mixed water and air are passed from the pump chamber outlet 26 through the water passage 34 to the water / water separation chamber. It is released inside 32. In the water / water separation chamber 32, the released water and air are separated, and the separated water is returned to the pump chamber 18 through the return water passages 38a and 38b. Pump room 1
The water returned to the inside of 8 is mixed with new air from the suction port 30, and is again discharged into the steam separation chamber 32. While repeating such operation, water starts to be sucked from the suction port 30, and the pumping operation is started. At the stage of shifting to the pumping operation, the pressure in the steam separation chamber 32 rises as the water is filled. The inside of the cylinder portion 40 (the pump chamber 18) and the outside of the piston portion 46 (the steam separation chamber 3)
2), a piston portion 46 is drawn into the cylinder portion 40 while compressing the coil spring 44, thereby causing the valve portions 48a and 48b to return to the return channel, as shown in FIG. 38a and 38b
To close.

According to this embodiment, the differential pressure for opening and closing the valve portions 48a and 48b is applied to the cylinder portion 40.
The valve parts 48a and 48b are
It is possible to reduce the influence of the water flow on the opening / closing operation of and to obtain stable self-priming performance. Referring to FIGS. 5 and 6, in a self-priming pump 56 of another embodiment, a cylinder portion 40 is formed in the central portion of the steam separation chamber 32, and return water passages 38a and 38b are formed in the vicinity thereof. .. An elastic body 58 made of rubber, for example, is used instead of the coil spring 44 in the above-described embodiment. The elastic body 58 is
A ring-shaped gasket portion 60 that is interposed between the second casing 14 and the third casing 16 is included, and a band-shaped portion 62 that passes through the center of the gasket portion 60 is integrally formed inside the gasket portion 60. The piston portion 46 and the valve portions 48a and 48b are attached to the center of the strip portion 62.

Referring to FIGS. 7 and 8, in a self-priming pump 64 of another embodiment, a piston portion 46 is formed so as to project from the upper surface of the central portion of the second casing 14 into the steam separation chamber 32. The piston portion 46 is covered with the cylinder portion 40 via the coil spring 44. And
A valve portion 66 for opening and closing the return water passages 38a and 38b is formed at the lower end of the cylinder portion 40. A band-shaped elastic body 68 is formed to extend from the lower end of the cylinder portion 40 to prevent the cylinder portion 40 from falling off, and the end of the elastic body 68 is located between the second casing 14 and the third casing 16. It is connected to the gasket 70 inserted in. In this embodiment, the cylinder portion 40, the valve portion 66, the elastic body 68 and the gasket 70 are integrally formed of an elastic material such as rubber.

Referring to FIGS. 9 and 10, in the self-priming pump 72 of still another embodiment, the second casing 1
A cylinder portion 40 is formed so as to project from the upper surface of the central portion of the nozzle 4 into the water / water separation chamber 32. A piston portion 46 is inserted into the cylinder portion 40 via a coil spring 44. Then, the cylindrical body 74 is arranged so as to cover the cylinder portion 40. The piston portion 46 and the tubular body 74 are joined to each other at their upper ends, and a valve portion 66 that opens and closes the return water passages 38a and 38b is formed at the lower end of the tubular body 74. Further, a band-shaped elastic body 68 that extends from the lower end of the tubular body 74 and prevents the piston portion 46 from falling off is formed. The end of the elastic body 68 is connected to the second casing 14 and the third casing 16. Is connected to a gasket 70 inserted between the two. In this embodiment, the piston portion 46, the tubular body 74, the valve portion 6
6. The elastic body 68 and the gasket 70 are integrally formed of an elastic material such as rubber.

These self-priming pumps 56, 64 and 7
Also in No. 2, since the cylinder portion for obtaining the differential pressure is formed independently of the return water channel, stable self-priming performance can be obtained as in the self-priming pump 10 of the previous embodiment. ..

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an illustrative view showing a state in which the return water channel is closed in the embodiment of FIG.

FIG. 5 is a schematic sectional view showing another embodiment of the present invention.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a schematic sectional view showing another embodiment of the present invention.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a schematic sectional view showing still another embodiment of the present invention.

10 is a cross-sectional view taken along line XX in FIG.

[Explanation of symbols]

 10, 56, 64, 72 ... Self-priming pumps 12-16 ... Casing 18 ... Pump chamber 22 ... Impeller 32 ... Air / water separation chamber 38a, 38b ... Return water channel 40 ... Cylinder part 44 ... Coil spring 46 ... Piston part 48a, 48b , 66… Valve part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masanori Takamichi 1-247 Shikitsuhigashi Naniwa-ku Osaka City Kubota Lang Co., Ltd.

Claims (1)

[Claims] 1. A pump chamber having an inlet and an outlet, in which an impeller is housed, a steam separation chamber for taking in water discharged from the outlet, the pump chamber and the steam separation chamber. A return water channel that communicates with the return water channel, and a cylinder part that is provided independently of the return water channel and has one end that communicates with the pump chamber and the other end that communicates with the steam separation chamber, a piston part that is inserted into the cylinder part, And a valve provided on the piston portion and for opening and closing the return water passage, wherein the piston portion is located inside the cylinder portion when a pressure difference of a certain level or more occurs between the pump chamber and the steam separation chamber. A self-priming pump that is retracted, whereby the valve closes the return channel.