JPH0573288U - Vertical vortex pump air vent device - Google Patents

Abstract

(57) [Abstract] [Purpose] A vertical centrifugal pump with no discharge leakage due to a reliable air eliminator installed internally by utilizing the joining surface of the upper and lower split type pump casings without the need for an expensive peacock. To provide at low cost. [Structure] A vertical hole 7 is provided in a lower surface of a peripheral wall of a pump casing upper half portion 1b in a vertically split type pump casing 1 to accommodate a valve body 6 such as a glass ball so as to be vertically movable, and an air hole 8 is provided in an upper wall of the vertical hole 7. A ditch 9 is provided which is formed at one side of the pump swirl chamber 5 and communicates with the vertical hole 7 so that the valve body 6 moves up and down to expel the air at the initial stage of starting the pump and to prevent discharge leakage during pump operation. Configured to be viewed.

Description

[Detailed description of the device]

[0001]

[Technical field of invention]

 The present invention relates to an air vent device for a vertical centrifugal pump.

[0002]

[Prior art and its problems]

 Conventionally, as an air vent device for a centrifugal pump, an air vent hole is formed at the top of the pump swirl chamber or the discharge pipe, and an air vent valve such as a peacock is screwed into this, and the peacock is expensive. Since it involves thread cutting and screwing work, it causes a high cost, and especially in a small pump, it accounts for a large proportion of the cost. Therefore, there is a product in which the air vent hole is simply bored and the air vent valve is not attached, but this is not preferable because water is blown out from the air vent hole after the air is released.

[0003]

[The purpose of the device]

 The purpose of the present invention is to produce a vertical centrifugal pump without discharge leakage at a low cost by a simple and reliable air venting device that does not involve threading work or screwing work without using an expensive peacock or the like. Especially.

[0004]

[Device configuration]

 In the air bleeder for a vertical centrifugal pump according to the present invention, an upper and lower peripheral wall of the lower half of the pump casing is watertightly coupled to a lower surface of the upper half of the pump casing to form a pump swirl chamber inside. In the casing, a vertical hole is formed in the lower surface of the upper half of the pump casing to allow the valve element to move up and down, and the vertical hole is formed in an opening on the lower surface of the casing. A gutter that opens from one side into the vertical hole is opened to accommodate the valve element made of a material having a larger specific gravity than water in the vertical hole.The upper surface of the lower half of the pump casing is the lower surface of the upper half of the pump casing. The bottom surface opening of the vertical hole is closed and the bottom surface of the hole is formed by water-tightly connecting to the bottom.

[0005]

[Action]

 At the initial stage of starting the pump, the air in the pump swirl chamber reaches the upper side of the vertical hole from the side groove and is expelled to the outside through the air vent hole. When the air is completely released, the valve body moves up in the vertical hole under the action of water pressure, and the pump continues to operate in a state where it does not leak to the vicinity of the lower edge of the air vent hole so that discharge leakage does not occur. If the discharge pressure is no longer used due to the operation of the pump being stopped, the valve element in the vertical hole will drop to the bottom of the hole by its own weight and the air vent hole will be opened. A system will be put in place to facilitate this.

[0006]

【Example】

 Hereinafter, description will be given with reference to the drawings of the embodiments.

Reference numeral 1 denotes an upper and lower split type pump casing, which has an upper edge of a peripheral wall of a lower pump casing 1a having a pump suction port 2 in a central portion of a lower wall and a through hole 4 of a motor shaft 3 in a central portion of the upper wall. The lower end of the peripheral wall of the upper pump casing 1b that is provided is watertightly coupled to the lower edge of the peripheral wall of the upper pump casing 1b by means of a screw stopper provided with the packing P, so that the pump swirl chamber 5 is formed inside. Then, at a proper position on the lower surface of the peripheral wall of the upper pump casing 1b, a vertical hole 7 through which the valve element 6 can be moved up and down is recessed in an opening on the lower surface, and an air vent hole 8 is formed in the upper wall of the vertical hole 7. A side groove 9 is opened from one side of the pump swirl chamber 5 into the vertical hole 7. The valve body 6 is made of a material having a greater specific gravity than water, such as glass beads, and is formed into a spherical shape. When the valve body 6 is fitted into the vertical hole 7, the upper surface of the peripheral wall of the pump casing lower half portion 1a is attached to the pump casing. If it is watertightly coupled to the lower surface of the peripheral wall of the upper half 1b, the lower surface opening of the vertical hole 7 is closed and the hole bottom surface 10 is formed. Reference numeral 11 denotes an impeller fitted in the lower guide portion of the motor shaft 3 in the pump swirl chamber 5, and 12 denotes a pump discharge port led out from the pump swirl chamber 5.

As shown in FIG. 2 when the pump is stopped, the valve body 6 in the vertical hole 7 descends due to its own weight to come into contact with the bottom surface 10 of the hole, and is separated from the peripheral portion of the lower edge of the air vent hole 8. An exhaust passage from the pump swirl chamber 5 through the side groove 9 to the air vent hole 8 above the vertical hole 7 is electrically connected. Then, in the initial stage of starting the pump, the air in the pump swirl chamber 5 reaches above the vertical hole 7 from the side groove 9 and is expelled to the outside through the air vent hole 8. When the air is completely exhausted, the water sucked from the pump suction port 2 goes around the pump swirl chamber 5 and is discharged from the pump discharge port 12, but the valve body 6 in the vertical hole 7 is affected by the water pressure, and as shown in FIG. As described above, the air vent hole 8 is in close contact with the peripheral portion of the lower edge of the air vent hole 8, so that the air vent hole 8 is closed and the pump operation is continued under the condition that no discharge leakage occurs. When the discharge pressure ceases to operate due to the operation stop of the pump, the valve body 6 in the vertical hole 7 descends to the hole bottom surface 10 by its own weight and separates from the lower edge peripheral portion of the air vent hole 8 as shown in FIG. The air vent hole 8 is opened so that the exhaust passage from the inside of the pump swirl chamber 5 to the air vent hole 8 in the upper part of the vertical hole 7 through the side groove 9 is connected, and the air is expelled at the initial stage of starting the pump. A system will be put in place to smooth the action.

[0009]

[Effect of the device]

 According to the present invention, a vertical vortex pump without discharge leakage can be produced at a low cost without using an expensive peacock by an air bleeding device that operates reliably by using the connecting surfaces of the upper and lower split type pump casings. There is an advantage of getting.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of essential parts of a vertical centrifugal pump equipped with an air vent device of the present invention.

FIG. 2 is an enlarged view of a main part of FIG. 1, showing a state in which a valve body is being lowered in a vertical hole.

FIG. 3 is an enlarged view of a main part of FIG. 1, showing a state in which a valve body is raised in a vertical hole.

FIG. 4 is an enlarged view of a main part of an upper half of the pump casing in FIG.

5 is a plan view seen from the lower side of FIG. 4. FIG.

FIG. 6 is an enlarged view of a main part of a lower half portion of the pump casing in FIG.

[Explanation of symbols]

 1 Vertical split type pump casing 1a Pump casing lower half 1b Pump casing upper half 5 Pump swirl chamber 6 Valve body 7 Vertical hole 8 Air vent hole 9 Side groove 10 Hole bottom

Claims (1)

[Scope of utility model registration request] In a vertically split pump casing (1) in which the upper surface of the peripheral wall of the lower half of the pump casing (1a) is watertightly connected to the lower surface of the peripheral wall of the upper half of the pump casing (1b) to form a pump swirl chamber (5) inside. A vertical hole (7) is formed on the lower surface of the peripheral wall of the upper half part (1b) of the pump casing so that the valve body (6) can be moved up and down, and the upper wall of the vertical hole (7) has an air vent hole. (8) is drilled and a side groove (9) is formed from one side of the pump swirl chamber (5) to the vertical hole (7), and a valve body (6) made of a material having a larger specific gravity than water is installed. It is housed in the vertical hole (7) and the upper surface of the peripheral wall of the lower half of the pump casing (1a) is watertightly coupled to the lower surface of the peripheral wall of the upper half of the pump casing (1b) to close the lower opening of the vertical hole (7). So that the bottom surface (10) of the hole is formed. Air vent device of the vertical centrifugal pump.