JPH0742691A - Liquid suction and discharge device - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to perform effective self-priming action and gas-liquid separation action in a gas-liquid separation chamber with an extremely small volume, and it also functions effectively for residual water treatment work that easily sucks in air, and (EN) Provided is a liquid suction / discharge device which is portable and excellent in mobility due to its small size and light weight. [Structure] A water supply passage communicating from the inside to the outside of a pump swirl chamber 4 is divided into two systems to generate a gas-liquid separation action, and a liquid having a high air-fuel ratio sent out from a first system passes through a discharge water passage 6. The liquid with a low air-fuel ratio discharged from the pump discharge port 8 and sent from the second system is returned to the pump swirl chamber 4 from the self-priming hole 3 via the return water passage 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid suction / exhaust device using a submersible centrifugal pump, and is particularly effective for use in residual water treatment such as draining at a low water level where air can be easily sucked in and absorbing pooled water on the floor. It is a thing.

[0002]

2. Description of the Related Art As is well known, during residual water treatment, air is often sucked together with water from the suction port. Originally, submersible centrifugal pumps do not like to suck in air, but in residual water treatment machines that use submersible centrifugal pumps, self-priming water flows into the pump swirl chamber due to the weight of the water entering the gas-liquid separation tank. In order to effectively remove air from the pump vortex chamber, a large-capacity gas-liquid separation tank is required, and as it becomes larger and heavier, it is not suitable for a portable type, and liquid suction and discharge work that requires maneuverability. I have the regret that I can't handle it.

[0003]

It is an object of the present invention to provide a liquid suction / exhaust device using a submersible centrifugal pump, which has an effective self-priming action in a gas-liquid separation chamber having an extremely small volume without requiring a large-volume gas-liquid separation tank. (EN) It is possible to provide a structure which can perform a gas-liquid separation action, effectively functions also in a residual water treatment work in which air is easily sucked in, and is portable and excellent in maneuverability due to reduction in size and weight.

[0004]

According to the liquid suction / discharge device of the present invention, in the liquid suction / discharge device using a submersible centrifugal pump, a self-suction hole is provided in the periphery of the suction hole formed in the pump casing constituting the pump swirl chamber. A return water passage for communicating the self-priming hole with an opening of a lower surface of a second delivery passage described later is provided laterally, and a first delivery passage having a lateral hole shape that opens outward from an upper inner portion of the pump swirl chamber A lateral hole-shaped second delivery passage that opens outward from the lower inside of the swirl chamber is opened, and the end of the first delivery passage is formed in the lower surface opening so as to form a gas-liquid separation chamber composed of these delivery passages. Then, it was connected to the return channel.

[0005]

Embodiments will be described below with reference to the drawings of the embodiments.

Reference numeral 1 denotes a pump casing made of synthetic rubber, which is formed in an inverted concave shape by guiding the peripheral wall 1b from the edge portion of the upper wall 1a and forms a suction hole 2 in the center of a corrosion-resistant hard disk. Lower wall 1c that is installed and has self-priming holes 3 ...
Is fixed to the lower surface of the peripheral wall 1b to form the inside of the pump swirl chamber 4. Reference numeral 5 denotes a motor chamber that is erected above the pump swirl chamber 4, and 6 is a discharge water channel that is provided on the outer periphery of the motor chamber 5, and includes a pump inlet 7 and a pump outlet 8
Communicate with. A check valve 9 is provided in the pump suction port 7, and the outer periphery of the tip is formed at a connecting portion 10 of a suction hose (not shown). The leading end of the suction hose is formed at a suitable liquid suction port according to the situation of the liquid supply source. As in the patent No. 1143367 previously developed by the applicant, for example, various kinds of suction ports suitable for absorbing liquid when the liquid depth is extremely shallow, or a suction port with a strainer for sewage, etc. are prepared, and these can be arbitrarily attached / detached and replaced. The structure will allow. The outer circumference of the tip of the pump discharge port 8 is formed in a connecting portion 11 of a discharging hose (not shown), and the leading end of the discharging hose extends to a predetermined disposal site. Reference numeral 12 is a priming hole formed in an upper portion of the discharge water channel 6, and 13 is a plug for closing the priming hole 12. 14 is a motor chamber 5 to a pump vortex chamber 4
A rotary shaft guided downwardly, 15 is an impeller fitted to the rotary shaft 14 in the pump swirl chamber 4, and 16 is for communicating the pump suction port 7 and the suction hole 2 through a suction passage 17 described later. A through hole vertically provided in the casing peripheral wall 1b, and 18a is a first delivery passage laterally provided in the casing peripheral wall 1b so as to escape from the inside of the pump swirl chamber 4 to the outside, and its end is formed in the upper opening 19a. And communicates with the discharge water channel 6.
18b is a second delivery passage laterally provided in the casing peripheral wall 1b so as to pass outward from the lower inner portion of the pump swirl chamber 4, and its end is formed in the lower surface opening 19b to form the discharge water passage 6 and the return water passage 20 described later. Communicate with. Reference numeral 21 denotes a transfer path formed so as to communicate from a lower part of the first delivery path 18a to a lower part of the second delivery path 18b, and 22 denotes a mounting screw insertion hole formed at a key portion of the casing peripheral wall 1b. Bottom plate 23 described later
The mounting screw insertion hole 24 and the screw screwing hole 26 of the outer case 25 are formed concentrically. Reference numeral 23 denotes a bottom plate fixed to the lower surface of the casing lower wall 1c, which has a corrosion-resistant structure in which the main part of the cored bar is covered with synthetic rubber. Then, on the fixing surface of the bottom plate 23, the conduction hole 16 and the suction hole 2
A groove-shaped suction passage 17 is provided so as to communicate with each other, and a groove-like return water passage 20 is provided so as to allow the lower surface opening 19b of the second delivery passage 18b and the self-priming hole 3 to communicate with each other. .
Reference numeral 26 is a mounting screw for integrally connecting the three members of the outer case 25, the pump casing 1 and the bottom plate 23, and 27 is a handle attached on the head cover 28.

[0006]

In use, the pump swirl chamber 4 is filled with water so that the inside of the swirl chamber 4 is filled with water, the grip 27 is grasped to move the device to an arbitrary place, and the pump suction port 7 is led out. The tip liquid suction port of the suction hose is inserted into a desired liquid supply source, and the motor is driven while the priming hole 12 is closed by the plug 13.

Most of the gas-liquid sucked into the pump swirl chamber 4 through the suction passage 17 is discharged from the first discharge passage 18a into the discharge water passage 6.
In the process of passing through, the motor chamber 5 is sent out from the pump discharge port 8 while being cooled, and is carried to a predetermined disposal place by a discharge hose. Only the liquid having a low air-fuel mixture in the lower part of the pump swirl chamber 4 is sent out from the second delivery passage 18b, and the liquid mixture having a high air-fuel mixture which is blocked by the upper edge e of the second delivery passage 18b is stagnant. The liquid is guided into the first delivery passage 18a along the inner circumference i of the casing peripheral wall 1b, and from there, the discharge water passage 6a.
It rises inward. Further, the liquid having a low air-fuel ratio that has passed through the second delivery passage 18b is further gas-liquid separated, the gas rises into the discharge water passage 6, the liquid descends, and the return water passage 20.
It is returned as self-priming water from the self-priming hole 3 into the pump swirl chamber 4 through the inside. On the other hand, not all of the gas-liquid sent out from the inside of the first delivery passage 18a rises into the discharge water passage 6, but the gas-liquid separation action in the first delivery passage 18a causes the mixture ratio to increase. A part of the liquid that is low passes through the transfer passage 21 and is transferred into the second delivery passage 18b, where it is further separated into gas and liquid, the gas rises into the discharge water passage 6, and the liquid falls into the return water passage 20. Although it is returned from the self-priming hole 3 into the pump swirl chamber 4 as self-priming water, most of the gas-liquid blocked by the upper edge s of the transfer channel 21 in the first delivery channel 18a rises into the discharge channel 6. To do.

As described above, a part of the discharge water is used as self-priming water, and the self-priming water generated in a state of low air-mixing ratio due to the height difference of the gas-liquid delivery passage is forced into the pump swirl chamber 4. Since the liquid is sucked and discharged while being returned to, it is possible to cope with a large amount of suction of air in a drought state.

[0009]

According to the present invention, an effective self-priming action and a gas-liquid separation action can be performed in a gas-liquid separation chamber having an extremely small volume without the need for a large-volume gas-liquid separation tank as in the prior art. Therefore, it is possible to obtain a liquid suction / discharge device that functions effectively even in the residual water treatment work in which it is easy to suck in air, and is portable and excellent in maneuverability due to its small size and light weight.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a main part of a liquid suction / discharge device of the present invention, which discloses a path in which a pump swirl chamber communicates with a discharge water channel via an upper opening of a first delivery channel.

FIG. 2 is a vertical cross-sectional side view of a main part of the liquid suction / discharge device of the present invention, which discloses a path through which a pump swirl chamber communicates with a discharge water channel and a self-priming water hole through a lower surface opening of a second delivery channel. .

FIG. 3 is a vertical cross-sectional side view of a main part of the liquid suction / discharge device of the present invention, which discloses a structure for connecting a pump casing and a bottom plate to an outer case.

FIG. 4 is a plan view of the liquid suction / discharge device of the present invention with the lower wall of the pump casing removed.

FIG. 5 is a bottom view of the liquid suction / discharge device of the present invention with the lower wall of the pump casing removed.

FIG. 6 is a plan view of a bottom plate of the liquid suction / discharge device of the present invention.

FIG. 7 is a vertical sectional side view of an outer case of the liquid suction / discharge device of the present invention.

FIG. 8 is a vertical sectional side view of a pump casing in the liquid suction / discharge device of the present invention.

FIG. 9 is a vertical sectional side view of a bottom plate in the liquid suction / discharge device of the present invention.

[Explanation of symbols]

 1 Pump Casing 2 Suction Hole 3 Self-Suction Hole 4 Pump Vortex Chamber 8 Pump Discharge Port 18a First Delivery Path 18b Second Delivery Path 19a Upper Surface Opening 19b Lower Surface Opening 20 Return Water Channel

Claims (1)

[Claims] In a liquid suction / exhaust device using a submersible centrifugal pump, a self-suction hole (3) is provided around a suction hole (2) opened in a pump casing (1) which constitutes a pump swirl chamber (4),
A return water passage (20) for connecting the self-priming hole (3) to a lower surface opening (19b) of a second delivery passage (18b) described later is provided laterally, and the pump swirl chamber (4) is directed outward from an upper inner portion thereof. A lateral-hole-shaped first delivery passage (18a) is formed, and a lateral-hole-shaped second delivery passage (18b) that opens outward from the lower inside portion of the pump swirl chamber (4) is opened. Road (1
8a) and (18b) to form a gas-liquid separation chamber, the end of the first delivery passage (18a) is formed in the upper opening (19b) to communicate with the pump outlet (8) and the second delivery passage (8). A liquid suction / discharge device characterized in that the end of 18b) is formed in the lower surface opening (19b) and communicated with the return water passage (20).