JPH04308394A - Self-priming pump - Google Patents

Abstract

PURPOSE:To reduce air, mixed into water returned into a pump chamber, to the least possible quantity so as to improve self-priming performance by providing a sheet like elastic body formed to partition a steam separating chamber from a water sump chamber and provided with a hole for allowing water to enter into the water sump chamber from the steam separating chamber, and a return conduit for communicating the water sump chamber with an inlet. CONSTITUTION:A steam separating chamber 42 and a water sump chamber 30 are partitioned by a sheet like elastic body 44, and a hole 46 for taking water into the water sump chamber 30 from the steam separating chamber 42 is formed at the partition part peripheral part of the sheet like elastic body 44. Water and air discharged into the steam separating chamber 42 flows in a vortex inside the steam separating chamber 42. Water of large specific gravity is collected to the peripheral part of the vortex and flows into the water sump chamber 30 through the hole of the sheet like elastic body 44 so as to be returned into a pump chamber 24 through a return conduit 32. The water returned into the pump chamber 24 is mixed again with air and discharged into the steam separating chamber 42.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a self-priming pump, and in particular, the present invention relates to a self-priming pump, in particular, for example, returning water discharged from a pump chamber outlet into a steam-water separation chamber through a return channel to the pump chamber inlet, thereby providing a self-priming effect. The present invention relates to a self-priming pump which has a return waterway closed after shifting to pumping operation.

0002

2. Description of the Related Art An example of this type of self-priming pump is disclosed in, for example, Japanese Patent Laid-Open No. 103987/1987. In this prior art, a plunger is attached to the air separation chamber side opening (hereinafter referred to as "return port") of the return waterway to automatically open and close the return waterway.

0003

However, the above-mentioned prior art has a problem in that self-priming performance is poor because a large amount of air is mixed into the water returned to the pump chamber through the return waterway. Therefore, the main object of the present invention is to provide a self-priming pump that can improve self-priming performance.

0004

[Means for Solving the Problems] The present invention provides a pump chamber having an inlet and an outlet and in which an impeller is housed; A steam/water separation chamber having an intake port, a water reservoir located adjacent to the steam/water separation chamber, and a sheet-like elastic body having a hole that partitions the steam/water separation chamber and the water reservoir and allows water to enter the water reservoir from the separation chamber. , and an opening is formed on the inner surface of the water storage chamber, and a return waterway is provided that communicates the water storage chamber and the inlet, and when a pressure difference of a certain level or more is generated between the air/water separation chamber and the water storage chamber, the sheet-like elasticity It is a self-priming pump whose body is deformed, thereby closing the return channel.

[0005]

[Operation] Water and air discharged into the steam/water separation chamber flow in a whirlpool inside the steam/water separation chamber. Therefore, water with a high specific gravity gathers around the vortex, flows into the water reservoir chamber through the holes in the sheet-like elastic body formed there, and is returned to the pump chamber through the return channel. The water returned to the pump chamber contains air again and is discharged into the air-water separation chamber. At the stage of transition to pumping operation, if a pressure difference above a certain level occurs between the steam/water separation chamber and the water storage chamber, the sheet-like elastic body deforms, and for example, the sheet-like elastic body sticks tightly to the valve seat and the return channel will be closed.

[0006]

According to the present invention, the air mixed in the water returned to the pump chamber can be reduced as much as possible, so that the self-priming performance can be improved. The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A self-priming pump 10 of this embodiment shown in FIG. 1 includes a first casing 12, a second casing 14, a third casing 16, and a fourth casing 18. A motor (not shown) and the like are arranged inside the first casing 12,
A rotating shaft 20 extending from the motor projects vertically from its upper end. An impeller 22 is attached to the rotating shaft 20.

A pump chamber 24 that accommodates an impeller 22 is formed in the center of the second casing 14. A pump chamber inlet 26 is formed at the center of the upper part of the pump chamber 24, and a pump chamber outlet 28 is formed extending upward from the periphery of the pump chamber 24. A water reservoir chamber 30 is formed in the center of the third casing 16. The water reservoir chamber 30 communicates with the pump chamber inlet 26 via a return waterway 32 formed below. An opening for the return waterway 32, ie, a return port 34, is formed in the center of the bottom surface of the water reservoir chamber 30, and an annular projection, ie, a valve seat 36, is formed to surround the return port 34. A discharge side connecting path 38 is formed in the peripheral portion of the third casing 16, and a suction side connecting path 40 that spans the second casing 14 is formed from the peripheral portion to the lower center.

A substantially cylindrical steam/water separation chamber 42 is formed in the center of the fourth casing 18 so as to be adjacent to the water reservoir chamber 30 of the third casing 16 . A sheet-like elastic body 44 made of rubber, for example, is inserted between the fourth casing 18 and the third casing 16, and the air-water separation chamber 42 and the water reservoir chamber 30 are partitioned off by the sheet-like elastic body 44. A steam/water separation chamber 42 is provided around the partition portion of the sheet-like elastic body 44.
A hole 46 is formed through which water is introduced into the water reservoir chamber 30. Only one hole 46 may be formed, or two or more holes 46 may be formed. Note that the partition portion of this sheet-like elastic body 44 functions as a diaphragm, and the other portion functions as a gasket. As can be clearly seen from FIGS. 1 and 2, a discharge port 48 is formed in the upper center of the steam/water separation chamber 42, and a discharge port 48 is formed on the inner wall surface, as can be clearly seen from FIGS. 1 and 3. A steam/water separation chamber inlet 50 is formed which communicates with the pump chamber outlet 28 via the passage 38 . The steam/water separation chamber inlet 50 is formed to flow into the steam/water separation chamber 42 from a substantially tangential direction. Further, a suction port 52 is formed in the periphery of the fourth casing 18 and communicates with the pump chamber inlet 26 via the suction side connection path 40 .

Casings 12-18 are interconnected by bolts 54 and nuts 56. In this self-priming pump 10, an impeller 2 is driven by a motor (not shown).
2, water and air are mixed in the pump chamber 24, and the mixed water and air flow from the pump chamber outlet 28 through the discharge side connection path 38 and the air/water separation chamber inlet 50 into the air/water separation chamber 42. is released. As mentioned above, the steam/water separation chamber inlet 50 is located in a substantially tangential direction with respect to the steam/water separation chamber 42 (FIG. 3).
Since the water and air are formed so as to flow in from the air, the released water and air flow in a spiral along the inner wall surface of the steam/water separation chamber 42. Therefore, water with a high specific gravity gathers at the periphery due to centrifugal force, and air with a low specific gravity gathers in the center. The water that has gathered around the periphery is absorbed by the sheet-like elastic body 44 formed there.
The water flows into the water reservoir chamber 30 through the hole 46 and returns to the pump chamber inlet 26 through the return port 34 and the return waterway 32. On the other hand, air with low specific gravity is discharged to the outside through the discharge port 48.

The water returned to the pump chamber inlet 26 flows into the pump chamber 24 again, mixes with fresh air from the suction port 52, and is sent into the steam/water separation chamber 42. As this operation is repeated, water begins to be sucked in from the suction port 52,
Shift to pumped storage operation. At the stage of shifting to pumping operation, the pressure inside the steam/water separation chamber 42 increases as it is filled with water. When a pressure difference above a certain level occurs between the steam separation chamber 42 and the water storage chamber 30, the sheet-like elastic body 44 is deformed and pressed against the valve seat 36, as shown in FIG. Closed.

[0012] According to this embodiment, water flows in a whirlpool inside the steam/water separation chamber 34, and only the water collected around the periphery is returned to the pump chamber 24, so that the steam/water ratio can be increased. , self-priming performance can be improved. Also, during pumping operation,
Since the return waterway 32 is automatically closed, there will be no reduction in pumping efficiency.

In this embodiment, the valve seat 36 is
It is optimally designed depending on the rigidity of the sheet-like elastic body 44 and the pressure difference generated between the steam/water separation chamber 42 and the water storage chamber 30. In addition, the holes 46 are designed to prevent deterioration of self-priming performance.
It is desirable that the size is such that only water can enter the area where only water flows and no air can enter. As shown in each of FIGS. 5 to 7, the discharge port 48 may be formed at the periphery of the steam/water separation chamber 42, offset from the upper center. In the case of FIG. 7, that is, when the discharge port 48 is formed on the opposite side of the suction port 52, the discharge side connecting path 38 and the discharge port 48 are formed continuously, as shown in FIG. .

This embodiment is also applicable to both vertical and horizontal installations. However, if it is installed horizontally, it should be installed so that the hole 46 is located in the lower half. A self-priming pump 60 of another embodiment shown in FIG.
The bottom surface of the water reservoir chamber 30 including the return port 34 is formed into a curved surface so that the bottom surface of the water reservoir chamber 30 and the sheet-like elastic body 44 come into close contact when the sheet-like elastic body 44 is deformed as shown in FIG. The return waterway 32 is closed by this. According to this embodiment, the position of the return port 34 can be determined relatively freely, so that the degree of freedom in design can be improved.

[Brief explanation of drawings]

FIG. 1 is an illustrative diagram showing an embodiment of the present invention.

FIG. 2 is a plan view of the embodiment of FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is an illustrative view showing a state in which the sheet-like elastic body deforms and closes the return waterway in the embodiment of FIG. 1;

FIG. 5 is a plan view showing a state in which discharge ports are formed in the peripheral portion.

FIG. 6 is a plan view showing a state in which discharge ports are formed in the peripheral portion.

FIG. 7 is a plan view showing a state in which discharge ports are formed in the peripheral portion.

8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7. FIG.

FIG. 9 is an illustrative view showing another embodiment of the invention.

10 is an illustrative view showing a state in which the sheet-like elastic body deforms and closes the return waterway in the embodiment of FIG. 9; FIG.

[Explanation of symbols]

10…Self-priming pump 12-18...Casing 26 ... Pump chamber inlet 28...Pump chamber outlet ３０　　　　　…Water storage room ３２　　　　　…Return waterway ３４　　　　　…Return port ３６　　　　　…Valve seat ４２　　　　　　…Sea water separation room 44... Sheet-like elastic body ４６　　　　　…hole 48...Discharge port 50...Entrance to the air-water separation room 52...Suction port

Claims (3)

[Claims] [Claim 1] A steam/water separator having an inlet and an outlet, a pump chamber in which an impeller is housed, and an inlet for taking in water discharged from the outlet so as to form a vortex inside the pump chamber. a water storage chamber disposed adjacent to the steam/water separation chamber; a sheet-like elastic body having a hole that partitions the steam/water separation chamber and the water storage chamber and allows water to enter the water storage chamber from the separation chamber; a return waterway having an opening formed in the inner surface of the water reservoir chamber and communicating the water reservoir chamber with the inlet;
A self-priming pump, wherein the sheet-like elastic body is deformed when a pressure difference of a certain level or more occurs between the steam separation chamber and the water storage chamber, thereby closing the return waterway. 2. The sheet-like elastic body is formed on the inner surface of the water reservoir chamber so as to surround the opening, and the sheet-like elastic body is pressed when a pressure difference of a certain level or more is generated between the steam separation chamber and the water reservoir chamber. The self-priming pump according to claim 1, further comprising a valve seat. 3. A curved surface portion on an inner surface of the water storage chamber to which the sheet-like elastic body is brought into close contact when a pressure difference of a certain level or more is generated between the steam-water separation chamber and the water storage chamber, and the curved surface 2. A self-priming pump according to claim 1, wherein the opening is provided within the pump.