JPH0742689A - Liquid suction 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 that connects the self-priming hole to the lower end surface of the opening of the gas-liquid separation chamber described later is provided, and a lateral-hole-shaped first delivery passage that opens from the inside to the outside of the pump swirl chamber is opened and its end opening is formed. The surface is communicated with the pump discharge port, and a lateral hole-shaped second delivery passage is formed which opens outward from the inner lower part of the pump vortex chamber, and its end is formed into a vertical hole-shaped gas-liquid separation chamber,
The upper end surface of the opening of the gas-liquid separation chamber was communicated with the pump discharge port, and the lower end surface of the opening was communicated with the self-priming hole through the return water passage.

[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. The peripheral portion of the lower wall 1c having the self-priming holes 3, ..., 3 provided around it is fixed to the lower surface of the peripheral wall 1b to form a pump swirl chamber 4. Reference numeral 5 is a motor chamber standing above the pump swirl chamber 4, and 6 is a discharge water channel provided on the outer periphery of the motor chamber 5, which communicates with a pump suction port 7 and a pump discharge port 8. 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 periphery of the tip of the pump discharge port 8 is a connecting portion 11 of a discharge hose (not shown).
The leading end of the discharge hose is extended 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. Reference numeral 14 is a rotary shaft guided from the motor chamber 5 into the pump swirl chamber 4, 15 is an impeller fitted to the rotary shaft 14 in the pump swirl chamber 4, and 16 is a pump suction port 7 and a suction hole 2. A communicating hole vertically provided in the casing peripheral wall 1b for communicating through the suction passage 17, which will be described later, is a first delivery passage horizontally provided in the casing peripheral wall 1b so as to escape from the inside of the pump swirl chamber 4 to the outside. , Its end is opened upward and communicates with the discharge water channel 6. Reference numeral 18b denotes a second delivery passage laterally provided on the casing peripheral wall 1b so as to pass outward from the inner lower portion of the pump swirl chamber 4 through a gas-liquid separation chamber 19 provided on the outer peripheral portion of the casing peripheral wall 1b. It communicates with the discharge water channel 6 and the return water channel 20 described later. Reference numeral 21 denotes a transfer passage formed so as to communicate with the inside of the second gas-liquid separation chamber 19 from the lower portion of the first delivery passage, and reference numeral 22 denotes a mounting screw insertion hole formed at a main part of the casing peripheral wall 1b. Bottom plate 23
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 second gas-liquid separation chamber 19 and the self-suction hole 3 to communicate with each other. 26 is the outer body 25,
An attachment screw 27 for joining the three members of the pump casing 1 and the bottom plate 23 together is a handle attached to 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 rises into the discharge water passage 6 through the upper opening thereof. The liquid having a low air-fuel ratio that has passed through the second delivery passage 18b is further gas-liquid separated in the gas-liquid separation chamber 19, the gas rises into the discharge water passage 6, and the liquid descends into the return water passage 20. Through the self-priming hole 3 and returned to the pump swirl chamber 4 as self-priming water. It should be noted that not all of the gas-liquid sent out from the first delivery passage 18a rises into the discharge water passage 6, but a part of the liquid having a low air-fuel ratio passes through the transfer passage 21 from the first delivery passage 18a. Then, it is transferred into the gas-liquid separation chamber 19, where it is further separated into gas and liquid, the gas rises into the discharge water passage 6, and the liquid descends into the return water passage 20 through the self-priming hole 3 into the pump swirl chamber 4. Is returned as self-priming water to the upper edge s of the transfer path 21 in the first delivery path 18a.
Most of the gas and liquid blocked by the ascends to the discharge water channel 6.

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 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 and a self-priming water hole via a gas-liquid separation chamber.

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 19 Gas-Liquid Separation Chamber 20 Return Water Path

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 the lower end surface of the opening of the gas-liquid separation chamber (19) is provided laterally, and has a horizontal hole shape that extends outward from the inside of the pump swirl chamber (4). The first delivery path (18a) is opened, the end of the first delivery path (18a) is opened upward to communicate with the pump discharge port (8), and the second lateral hole is formed from the lower inside of the pump swirl chamber (4) to the outside. Delivery path (18
b) is opened and its end is a vertical hole-like gas-liquid separation chamber (19)
And the upper end surface of the opening of the gas-liquid separation chamber (19) communicates with the pump discharge port (8), and the lower end surface of the opening communicates with the self-priming hole (3) through the return water passage (20). A liquid suction / discharge device characterized by the above.