JPH0653797U - Pump casing for centrifugal pump - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pump casing of a spiral pump capable of converting the lateral diameter of a swirl chamber into a wide and narrow shape in correspondence with the diameter of an impeller to be installed. [Structure] An outer edge portion of a suction cover 4 is formed on pump casing peripheral walls 6a, 6b, and one peripheral wall 6a is connected to a pump casing upper wall 1 to form a swirl chamber 7a recessed in one surface 4a of the suction cover 4. The lateral diameter is the other peripheral wall 6b
Is formed to be narrower than the lateral diameter of the swirl chamber 7b that is recessed by connecting to the pump casing upper wall 1, and the mounting surface of the suction cover 4 is changed according to the diameter of the impeller to be installed. , The lateral diameter of the swirl chamber is converted into wide and narrow.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pump casing of a centrifugal pump.

[0002]

[Prior art]

 If you want to change the discharge rate as a characteristic of the pump, it is usually necessary to increase or decrease the impeller diameter or the width of the blade wheel, and at the same time increase or decrease the lateral diameter or axial dimension of the swirl chamber. .

[0003]

[Problems to be solved by the device]

 However, in the conventional pump casing, the lateral diameter and the axial dimension of the swirl chamber are made invariable, so if the impeller diameter or impeller width is changed, the pump casing will also change accordingly. It is necessary to make new products with different lateral diameters and axial dimensions, which increases costs.

An object of the present invention is to provide a pump casing of a centrifugal pump in which the lateral diameter of the swirl chamber can be changed according to the diameter of the impeller installed.

[0005]

[Means for solving the problem]

 In the pump casing of the centrifugal pump according to the present invention, the outer edge portion of the suction cover is vertically projected to form the circumferential wall of the pump casing, and one circumferential wall is connected to the peripheral portion of the upper wall of the pump casing to form the suction cover. By forming the swirl chamber on one surface and connecting the other peripheral wall to the peripheral part of the upper wall of the pump casing, the swirl chamber is recessed on the other surface of the suction cover, and on the one surface of the suction cover. The lateral diameter of the swirl chamber recessed in is narrower than the lateral diameter of the swirl chamber recessed on the other surface of the suction cover.

[0006]

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

Reference numeral 1 is an upper wall of the pump casing, 2 is an impeller fitted to the motor shaft below the upper wall 1 of the pump casing, and 4 is a suction cover that faces the lower edge 2 e of the impeller 2 of the impeller 2 so as to be able to turn over. In addition, a suction hole 5 is formed in the central portion of the pump casing, and the outer edge portion is projected upward and downward to form the pump casing peripheral walls 6a and 6b, and the end edges of the peripheral walls 6a and 6b are formed on the pump casing upper wall 1 It is formed on the attachment part to the lower edge of the peripheral part. Then, as shown in FIG. 1, one surface 4e of the suction cover 4 is opposed to the lower edge 2e of the blade plate of the impeller 2, and one peripheral wall 6a is connected to the lower edge of the peripheral portion of the upper wall 1 of the pump casing, whereby A swirl chamber 7a is recessed on the one surface 4a. Further, as shown in FIG. 2, the other surface 6b of the suction cover 6 faces the lower edge 2e of the blade plate of the impeller 2, and the other peripheral wall 6b is connected to the lower edge of the peripheral portion of the upper wall 1 of the pump casing. A swirl chamber 7b is provided on the other surface 4b. However, the lateral diameter of the swirl chamber 7a recessed on the one surface 4a of the suction cover 4 must be smaller than the lateral diameter of the swirl chamber 7b recessed on the other surface 4b of the suction cover 4. Need.

8 ... 8 is a mounting bolt, 9 ... 9 is a bolt insertion hole provided in the mounting portion of the pump casing peripheral walls 6 a and 6 b, 10 ... 10 is a peripheral portion of the pump casing upper wall 1. It is a screw hole drilled from the lower edge.

When one of the peripheral walls 6a faces the lower edge of the peripheral portion of the pump casing upper wall 1 as described above, the swirl chamber 7a having a small lateral diameter is formed on the one surface 4a of the suction cover 4. Further, when the other peripheral wall 6b is opposed to the lower edge of the peripheral portion of the pump casing upper wall 1, a swirl chamber 7b having a large lateral diameter is formed on the other surface 4b of the suction cover 4. In any of these states, the mounting bolts 8 ... 8 are screwed into the screw holes 10 ... 10 from the bolt insertion holes 9 ... 9 so that the pump casing peripheral walls 6a and 6b integral with the suction cover 4 are attached to the pump casings. It is removably fixed to the lower edge of the peripheral portion of the upper wall 1.

In the use example of FIG. 1, a pump casing suitable for a centrifugal pump having a small impeller diameter is configured, and in the use example of FIG. 2, a pump casing suitable for a centrifugal pump having a large impeller diameter is configured. Will be done. Therefore, when the suction cover 4 in the use example of FIG. 1 is removed and turned upside down, and the suction cover 4 is fixed again with the other surface 4b facing the lower edge 2e of the blade plate, the swirl chamber having a large lateral diameter is obtained. 7b is configured to be a pump casing suitable for a centrifugal pump having a large impeller diameter, and the discharge amount can be increased.

[0011]

[Effect of device]

 According to the present invention, by simply changing the mounting surface of the suction cover, the lateral diameter of the swirl chamber can be changed to wide or narrow, and the discharge amount can be immediately corresponded to the impeller diameter to be installed. Can be changed, which is extremely convenient.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a main part of a centrifugal pump having a pump casing according to the present invention, showing a state corresponding to a small impeller diameter.

FIG. 2 is a vertical sectional side view of a main part of a centrifugal pump having a pump casing according to the present invention, showing a state corresponding to a large impeller diameter.

FIG. 3 is a vertical cross-sectional side view of a suction cover and a pump casing peripheral wall portion in the pump casing of the present invention.

FIG. 4 is a plan view of the suction cover and the pump casing peripheral wall portion of the pump casing of the present invention seen from one side.

FIG. 5 is a plan view seen from the other side of the suction cover and the peripheral wall portion of the pump casing in the pump casing of the present invention.

[Explanation of symbols]

 1 Pump Casing Upper Wall 4 Suction Cover 4a Suction Cover One Surface 4b Suction Cover Other Surface 6a One Peripheral Wall 6b Other Peripheral Wall 7a Vortex Chamber 7b Recessed on One Side of the Suction Cover 7b Recessed on the Other Surface of the Suction Cover Whirlpool chamber

Claims (1)

[Scope of utility model registration request] The outer edge portion of the suction cover (4) is vertically protruded to form the pump casing peripheral wall (6a, 6b), and one peripheral wall (6a) is connected to the peripheral portion of the pump casing upper wall (1) for suction. A swirl chamber (7a) is recessed on one surface (4a) of the cover (4), and the other peripheral wall (6b) is provided.
Is connected to the peripheral portion of the upper wall (1) of the pump casing to form a swirl chamber (7b) on the other surface (4b) of the suction cover (4), and one surface (4a) of the suction cover (4). ) The lateral diameter of the swirl chamber (7a) recessed above the swirl chamber (7a) recessed on the other surface (4b) of the suction cover (4).
A pump casing of a centrifugal pump, characterized in that it is narrower than the lateral diameter of b).