CN202718913U - Impellers of double suction mixed flow pump - Google Patents

Abstract

The utility model discloses impellers of a double suction mixed flow pump. The impellers of the double suction mixed flow pump comprise two double suction impellers which are arranged back to back. An impeller partition plate is used to separate between the two double suction impellers. Liquid outlets of the double suction impellers are connected with a volute in abutted mode. The impellers of the double suction mixed flow pump are characterized in that a volute partition plate is arranged in the volute and matched with the impeller partition plate to seal two liquid flow channels. The additional partition plate is arranged in the volute and seal effectively with the impeller partition plate so that two partition plates are matched to use and separate two liquid flows, wherein the two liquid flows share the same direction when entering into the volute. Thus, liquid flow interference and a consequential problem of stability can be avoided to the maximum and a prior hump problem is solved at the same time.

Description

Double suction mixed flow pump impeller

technical field

The utility model relates to the technical improvement of the delivery pump impeller, in particular to a double-suction mixed-flow pump impeller, which belongs to the technical field of pump fluid machinery.

Background technique

The vane pump is a tool for conveying fluid media, and it realizes the conveyance of fluid by step-by-step pressurization through the impeller. Among the existing technologies, there are mainly double-suction centrifugal pump impeller and double-suction pump volute (baffle) technologies. Compared with the centrifugal pump, the impeller of the mixed flow pump has the characteristics of large flow and low lift. The impellers of the mixed-flow pump are arranged back to back, and the middle partition (impeller partition) has a certain thickness, and the outlets of the two impellers enter the volute. Since the impeller and the baffle on it are rotating and the volute is stationary, the impeller baffle cannot form a seal against the wall of the volute, and the two liquid flows begin to merge before the outlet of the double-suction impeller enters the volute. When designing the impeller, the axial flow velocity at the outlet of the impeller is theoretically equal, but in order to expand the working range of the pump, it must be operated at a large and small flow rate, which leads to inconsistent velocities at the two outlets and changes in the direction, and the outlets on both sides of the impeller When the liquid flow enters the volute, there will be interference, which will affect the stability of the liquid flow and cause hump problems.

Utility model content

Aiming at the above-mentioned deficiencies in the prior art, the purpose of this utility model is to provide a double-suction mixed-flow pump impeller, which can solve the problem of liquid flow interference and the resulting stability.

The technical scheme of the utility model is achieved in that:

The impeller of the double-suction mixed-flow pump includes double-suction impellers arranged back to back. The middle of the double-suction impellers is separated by an impeller partition, and the liquid outlet of the double-suction impeller is connected to the volute. It is characterized in that: a volute partition is arranged in the volute , The volute partition and the impeller partition cooperate to realize the sealing of the two liquid flow channels.

Further, the longitudinal section of the part above the impeller partition at the liquid outlet of the double-suction impeller is "V"-shaped, and the volute partition enters the double-suction impeller and the impeller partition along the center of the "V" to realize two flow channels isolation.

The utility model effectively seals the impeller partition by adding a partition on the volute. The two partitions are used together to isolate the two liquid flows. The resulting stability problem, the previous hump problem is also solved at the same time.

The utility model will be applied to the occasion of large flow and low head, improve the type of impeller of double suction pump, solve the problem of high flow and low head, use this impeller to replace the impeller of axial flow pump, and solve the problem of unstable operation caused by the hump caused by the centrifugal pump.

Description of drawings

Fig. 1-Structure schematic diagram of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

Referring to Fig. 1, it can be seen from the figure that the impeller of the double-suction mixed-flow pump of the present invention includes double-suction impellers 1 arranged back to back, and the double-suction impellers 1 are installed on the impeller shaft 2. The middle of the double-suction impeller 2 is isolated by the impeller partition 3 , and the liquid outlet of the double-suction impeller is connected with the volute 4 . A volute partition 5 is arranged inside the volute 4 , and the volute partition 5 cooperates with the impeller partition 3 to realize the sealing of the two liquid flow passages 6 .

The longitudinal section of the double-suction impeller above the impeller partition at the liquid outlet is "V"-shaped, and the volute partition enters the double-suction impeller and the impeller partition along the center of the "V" to realize the isolation of the two liquid flow channels. . Arrows in the figure indicate the direction of liquid flow.

The double-suction mixed-flow pump impeller is formed by combining back-to-back two single-stage mixed-flow pump impellers. The mixed-flow pump has a large flow rate and low head, and the double-suction mixed-flow pump has many advantages such as larger flow rate, no hump, and relatively stable performance, so it has practical promotion significance.

The impeller of the utility model is directly applied to the vane pump. In the previous centrifugal vane pumps, there were only single-stage single-suction centrifugal pumps, mixed-flow pumps, axial-flow pump impellers, and double-suction centrifugal pump impellers, but there was no double-suction mixed-flow pump impeller. The impeller of the double-suction mixed-flow pump designed here has the characteristics of large flow, low lift, self-balancing axial force, and reduced necessary NPSH.

The above-mentioned embodiments of the utility model are only examples for illustrating the utility model, rather than limiting the implementation of the utility model. For those of ordinary skill in the art, other variations and modifications in various forms can be made on the basis of the above description. All the implementation manners cannot be exhaustively listed here. All obvious changes or variations derived from the technical solutions of the utility model are still within the scope of protection of the utility model.

Claims (2)

1. double suction mixed-flow pump impeller, comprise the double-entry impeller (1) that arranges back-to-back, isolate by impeller dividing plate (3) in the middle of the double-entry impeller (1), the liquid outlet of double-entry impeller (1) docks with spiral case (4), it is characterized in that: be provided with spiral case dividing plate (5) in spiral case (4), spiral case dividing plate (5) cooperates the sealing that realizes two liquid chunnels (6) with impeller dividing plate (3).

2. double suction mixed-flow pump impeller according to claim 1, it is characterized in that: the above longitudinal section, position of the liquid outlet impeller dividing plate of described double-entry impeller is " V " type, and the spiral case dividing plate enters the isolation that double-entry impeller and impeller dividing plate are realized two runners along the center of " V " font.

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