CN213144869U - Split centrifugal pump body - Google Patents

Abstract

The utility model discloses a to open centrifugal pump body, it comprises the half pump body on the left side, the half pump body on the right side, bolt and pin jointly. The left half pump body and the right half pump body are divided by taking the longitudinal center line of the concave volute flow channel of the normal pump body as a boundary, a radial outer convex rib is arranged on the boundary, and axial through holes and pin holes which are arranged at intervals are respectively arranged on the combination surface of the radial outer convex rib. When the left pump body and the right pump body are matched, the left pump body and the right pump body are connected into a complete pump body through bolts on the basis of pin positioning. The pump body with the split structure is simple, easy to pair and reliable in connection, and most importantly, the concave volute flow channels configured on the left half pump body and the right half pump body can be respectively subjected to fine cutting processing, the shape of the combined concave volute flow channel is error-free, the size is accurate, the surface is smooth, and the high-quality concave volute flow channel arranged in the pump body has the effects of reducing noise and vibration besides obviously reducing hydraulic loss. The utility model discloses be particularly suitable for special devices such as space flight and aviation, nuclear power, submarine supporting.

Description

Split centrifugal pump body

Technical Field

The utility model belongs to the technical field of machine part structural design technical field's a technical scheme, specifically say, the utility model relates to a pump body structural design, especially a to open centrifugal pump body.

Background

The pump body of the centrifugal pump is an important part of a loading impeller, and the shape, the surface roughness and the forming precision of a built-in volute flow passage directly influence the hydraulic performance of the pump. The pump body of the traditional centrifugal pump is of an integral structure, the inner cavity of the traditional centrifugal pump is provided with a complete volute flow channel, and the volute flow channel is an inwards concave curved surface body, so that the cross sections of all sections are different in size. Under the condition of the prior art, in order to ensure that the performances of pumps with the same specification are kept consistent, the industry generally adopts a die-casting forming method to implement the mass production of pump bodies of centrifugal pumps. The die casting forming process is mature, the forming is easy, the quality is stable, and the manufacturing precision requirement of the traditional centrifugal pump can be met. However, the precision of the built-in volute flow channel of the pump body produced by die casting is relatively low, and the matching requirement of part of special industries cannot be met. For example, centrifugal pumps for aerospace, nuclear and submarine equipment must be examined for vibration and noise indexes in addition to high hydraulic performance requirements. Therefore, the high-precision centrifugal pump matched with the special industries needs to adopt a more advanced production mode to obtain a pump body with a built-in volute flow passage, consistent shape, precise size and smooth surface.

Disclosure of Invention

The utility model discloses mainly to the not good enough problem of the built-in snail runner quality of the pump body of current die casting shaping production, provide a to open centrifugal pump body, this kind is to opening simple structure, positioning accuracy height, dismouting easily, and pump body blank is unpacked apart and is convenient for adopt numerical control equipment to implement the built-in snail runner of accurate forming processing.

The utility model discloses a technical goal is realized to following technical scheme.

A split centrifugal pump body consists of a left pump body half, a right pump body half, bolts and pins. The improvement is that: the left half pump body and the right half pump body are divided by taking the longitudinal center line of the inward concave volute flow channel of the normal pump body as a boundary, and are respectively provided with axial through holes and pin holes which are arranged at intervals on a radial outward convex edge rib (H) combining surface, and when the left half pump body and the right half pump body are matched, the left half pump body and the right half pump body are connected into a complete pump body by bolts on the basis of pin positioning.

As a further improvement, the pin is a taper pin.

Compared with the prior art, the utility model, following positive effect has:

1. the pump body is divided into a left half pump body and a right half pump body by taking the longitudinal center line of the concave volute flow channel of the conventional pump body as a boundary, and the split structure is simple, reasonable in boundary, accurate in positioning and easy to manufacture;

2. the left half pump body and the right half pump body of the split structure are matched and are positioned by adopting a pin and connected by adopting spiral locking, the connecting structure is reliable, and not only is the precise forming processing of the concave volute flow channel convenient to disassemble and respectively carried out, but also the matching and assembling are convenient;

3. the concave volute flow channels respectively arranged on the left half pump body and the right half pump body are open, the precise forming processing is easy to implement, the product quality is guaranteed, and the high-quality concave volute flow channels not only obviously reduce the hydraulic loss of the pump bodies, but also have the effects of noise reduction and vibration reduction.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a left side view of fig. 1.

Fig. 3 is a schematic cross-sectional view of the structure of fig. 1.

Fig. 4 is a top view of fig. 2.

Fig. 5 is a schematic view of the left pump half in fig. 1.

Detailed Description

The invention will be further explained with reference to the drawings and the examples.

The pump body of the split centrifugal pump shown in fig. 1 is composed of a left half pump body 1, a right half pump body 2, a bolt 3 and a pin 4. The left half pump body 1 and the right half pump body 2 are matching parts of split structures, and can be matched to form a complete centrifugal pump body. The interface of the left half pump body 1 and the right half pump body 2 is determined according to the concave volute flow channel and the longitudinal midline of the pump body of the conventional centrifugal pump, the left half pump body 1 and the right half pump body 2 which are manufactured as shown in figure 3 are respectively provided with half concave volute flow channels, the open concave volute flow channel is convenient for the precision forming processing by adopting a mechanical cutting mode, the numerical control milling machine is adopted for the cutting forming processing of the concave volute flow channel in the embodiment, the surface roughness Ra6.3 is obtained, the shape error is less than 0.06mm, and the processing quality of the size error is +/-0.04 mm. In order to facilitate the combination connection of the left half pump body 1 and the right half pump body 2, a radial outer convex rib H is arranged at each interface, axial through holes and pin holes which are arranged alternately are respectively arranged on the combination surface of the radial outer convex rib H, when the left half pump body 1 and the right half pump body 2 are matched, pins 4 are firstly installed in the pin holes to be positioned and matched, the pins 4 applied in the embodiment are conical pins, and then bolts 3 are inserted into the axial through holes to be locked and connected. The pump body with the split structure has the advantages of simple structure, easy pairing and reliable connection, and most importantly, the concave volute flow channels arranged on the left half pump body 1 and the right half pump body 2 can respectively realize fine cutting forming processing, the combined concave volute flow channels have complete shapes, accurate sizes and smooth surfaces, and the high-quality concave volute flow channels arranged in the pump bodies not only obviously reduce hydraulic loss, but also have the effects of noise reduction and vibration reduction. The pump body specification in this embodiment is flow Q =40T/H, and lift H =50m, uses the utility model discloses the pump efficiency who makes improves about 6.0%, and total vibration level descends about 3dB, and its noise reduction 5dB (A) is left and right sides, reaches anticipated processingquality through above-mentioned modified pump body, satisfies the supporting requirement of space flight and aviation, nuclear power and submarine completely.

Claims (2)

1. A pump body of a split centrifugal pump is composed of a left half pump body (1), a right half pump body (2), a bolt (3) and a pin (4); the method is characterized in that: the left half pump body (1) and the right half pump body (2) are divided by taking the longitudinal center line of the inward concave volute flow channel of the normal pump body as a boundary, and are provided with axial through holes and pin holes which are arranged at intervals on a joint surface of a radial outward convex rib (H) respectively, and when the left half pump body (1) and the right half pump body (2) are matched, the left half pump body and the right half pump body are connected into a complete pump body by using bolts (3) on the basis of positioning of the pins (4).

2. The split centrifugal pump body of claim 1, wherein: the pin (4) is a taper pin.

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