JPH0260877B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a self-priming WESCO pump.

[Conventional technology]

As a conventional self-priming type Wesco pump,
- As shown in Publication No. 1358, there is an attempt to improve self-priming performance by installing a collision wall inside the separation chamber.

[Problem to be solved by the invention]

However, since this collision wall is used to make the horizontal flow of water in the separation chamber a circular flow, it is not possible to effectively separate water and air vertically. Therefore, in order to obtain sufficient self-priming performance, the volume of the separation chamber must be increased, which is a factor in increasing the size of the self-priming type Wesco pump.

An object of the present invention is to improve the separation performance of the separation chamber between water and air and to reduce the volume of the separation chamber.

[Means to solve the problem]

The above purpose is to use a runner connected to the motor shaft,
a casing housing the runner; a head chamber provided above the discharge port of the casing and forming a steam/water separation chamber communicating with the discharge port; a self-priming plate provided within the steam/water separation chamber; In a self-priming Weico pump including a dividing wall that partitions the inside of the discharge port into a main stream port and a reflux port, the self-priming plate extends in the front-rear direction of the steam-water separation chamber from the front inner wall of the steam-water separation chamber. a collision plate that covers a portion above the discharge port; and a main plate that extends vertically from the lower end of the steam/water separation chamber above the dividing wall and along the front inner wall of the steam/water separation chamber. , a separation plate located at an intermediate portion in the vertical direction of the steam/water separation chamber and extending from a rear inner wall of the steam/water separation chamber in the front/rear direction of the steam/water separation chamber; is inclined such that its plate surface faces the lower end surface of the steam/water separation chamber and becomes farther away from the lower end surface of the steam/water separation chamber as it goes from the rear inner wall to the front inner wall of the steam/water separation chamber. This can be achieved by using a configuration that does this.

[Effect]

When the runner rotates, the steam/water mixture rises from the main stream of the discharge port of the casing as a discharge water stream, collides with the collision plate, and then rises inside the steam/water separation chamber while being deflected toward the separation plate. When the steam/water mixture reaches the separation plate, there is a first flow of almost only water that passes under the separation plate and reaches the opposite side of the main plate, and a first flow that passes under the separation plate and reaches the opposite side of the main plate. The air is divided into a second flow that separates the air upward while flowing upward along the separator plate to the opposite side of the main plate. Furthermore, the first flow and the second flow merge to form a return water flow, which is supplied into the runner through the return port of the discharge port of the casing without colliding with the discharge water flow rising from the main flow port. Ru. By repeating this operation, water and air in the air-water mixture can be smoothly separated.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

First, the overall configuration will be explained.

A runner 5 directly connected to the motor shaft 1 is housed in a casing 6. The casing 6 has an inlet 8 and an outlet 9. The discharge port 9 is connected to the flow dividing wall 7
It is divided into a main flow port 9a and a reflux port 9b. The head chamber 10 has a suction passage 11 and a steam/water separation chamber 12, and is fixed on the casing 6. The suction passage 11 communicates with the suction port 8. The lower left side portion of the steam/water separation chamber 12 communicates with the upper surface of the discharge port 9 .

Inside the steam/water separation chamber 12, there are a collision plate 20a and a main plate 2.
A self-suction plate 20 formed by integrally forming the 0b and the separation plate 20c is detachably attached. The self-priming board 20 is
From the lower end surface 12c of the steam/water separation chamber 12 to the steam/water separation chamber 1
Insert into 2.

A suction injection stopper 13 is provided on the upper surface of the head chamber 10.

Next, the self-priming effect will be explained.

After removing the plug 13 and injecting priming water into the separation chamber 10, when the runner 5 is rotated, the air-water mixture containing the air on the suction side and the priming water is separated from the suction side of the casing 6 and the discharge side. Partition wall part 15
, and most of it rises like flow A on the main flow port 9a side. As shown in FIG. 3, this steam/water mixture collides with the collision plate 20a, is deflected toward the separation plate 20c, and becomes a flow B that flows upward into the steam/water separation chamber 12. Next, it reaches the separation plate 20c, where it is divided into two streams, C and D. Flow C, which is mostly water, passes under the separation plate 20c and reaches the opposite side of the main plate 20b. In addition, since the flow D is a steam-water mixture containing a large amount of air, its density relative to the water in the flow C is low, so buoyancy acts and flows upward along the lower surface of the separation plate 20c, and further, Air is separated upward from above the separation plate 20c to the opposite side of the main plate 20b, leaving only water. Flows C and D become flow E and collide with the collision plate 20a.
Flows into the lower side of . This return water passes through the reflux port 9b, is supplied to the runner 5, and forms a steam-water mixture again with the air on the suction side. By repeating this operation, the self-priming action is completed.

According to this self-priming type Wesco pump, the upward flow of the air-water mixture rising from the discharge port 9 of the casing 6 is divided into two flows, upper and lower, by the separation plate 20c, so that the water and air Good separation is achieved. Further, since the main plate 20b is provided so that the discharge water flow and the return water flow can flow efficiently without colliding with each other, the self-priming performance is improved from this point as well. Therefore, the volume of the steam/water separation chamber 12 can be reduced.

In FIG. 5, it can be understood by comparing the self-priming performance characteristic curve P when the self-priming plate 20 of this embodiment is used and the self-priming performance characteristic curve Q when the self-priming plate 20 is not used. According to this embodiment, the self-priming performance is significantly improved.

Furthermore, in this embodiment, the self-priming plate 20 is formed separately from the head chamber 10 and is inserted and attached, so even if the runner 5, casing 6, etc. are different, the same head chamber 10 can be used. Therefore, efficient self-priming performance can be obtained by replacing only the self-priming plate 20.

〔Effect of the invention〕

According to the present invention, the upper flow of the air-water mixture rising from the discharge port of the casing is divided into streams, and furthermore, the discharge water flow and the return water flow are prevented from colliding with each other, so that water and air can be separated well. As a result, the self-priming performance can be greatly improved and the volume of the steam/water separation chamber can be reduced.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of the self-priming type Wesco pump of the present invention, Fig. 2 is a cross-sectional view of the head chamber of the same pump, Fig. 3 is a longitudinal cross-sectional view of the head chamber of the same pump, and Fig. 4 is a longitudinal cross-sectional view of the head chamber of the same pump. Fig. 5 is an exploded perspective view of the main parts of the pump, and Fig. 5 is a self-priming performance characteristic diagram. 1...Motor shaft, 5...Runner, 6...Casing,
7... Diversion wall, 9... Discharge port, 9a... Main stream port, 9b...
Reflux port, 10... Head chamber, 12... Steam/water separation chamber, 12a... Front inner wall, 12b... Rear inner wall, 12c
...lower end surface, 20...self-suction plate, 20a...collision plate, 20
b...Main plate, 20c...Separation plate, 20c ₁ ...Plate surface.

Claims (1)

[Scope of Claims] 1. A runner 5 connected to the motor shaft 1, a casing 6 housing the runner 5, and an air stream provided above the discharge port 9 of the casing 6 and communicating with the discharge port 9. It is equipped with a head chamber 10 forming a separation chamber 12, a self-priming plate 20 provided in the air-water separation chamber 12, and a dividing wall 7 that partitions the inside of the discharge port 9 into a main flow port 9a and a reflux port 9b. The suction plate 20 includes a collision plate 20a that extends from the front inner wall 12a of the steam-water separation chamber 12 in the front-rear direction 7 and extending in the vertical direction Y from the lower end of the steam/water separation chamber 12 along the front inner wall 12a of the steam/water separation chamber 12; , and from the rear inner wall 12b of the steam-water separation chamber 12 in the front-rear direction X of the steam-water separation chamber 12.
furthermore, the separation plate 20c has a plate surface _20c1 facing the lower end surface 12c of the steam/water separation chamber 12, and a rear inner wall 12b of the steam/water separation chamber 12. Front inner wall 12
A self-priming type Wesco pump, characterized in that the pump is inclined so that it becomes farther away from the lower end surface 12c of the steam/water separation chamber 12 as it goes toward a.