Duplex centrifugal pump

Abstract

The duplex centrifugal pump comprises a pump body, a sealing cover and a suspension frame are installed on the two opposite sides of the pump body respectively, a pump cover is installed on the suspension frame, a driving shaft is rotationally connected to the pump cover, a first impeller and a second impeller are installed on the driving shaft, a partition plate is connected into the pump body, and the first impeller and the second impeller are installed on the partition plate. A partition plate is arranged in the pump body and divides the interior of the pump body into a first pump cavity and a second pump cavity, the driving shaft penetrates through the partition plate, the first impeller is located in the first pump cavity, the second impeller is located in the second pump cavity, the first cavity and the second cavity are each provided with a water inlet, and the first cavity and the second cavity jointly communicate with a water outlet. The first impeller and the second impeller are installed on the driving shaft, and higher efficiency and larger flow or pressure output are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of centrifugal pumps, in particular to a duplex centrifugal pump. BACKGROUND

[0002] In industrial and civil facilities, centrifugal pumps are widely used for liquid delivery. Traditional centrifugal pump design usually contains a single pump cavity and a set of impeller system, which performs well in meeting basic fluid delivery requirements. However, as the performance requirements of flow, head and other performance increase in application fields, the design of single pump cavity often has difficulty in meeting the needs of high efficiency and large flow. In order to solve these problems, the method commonly used in engineering practice is to install two or more centrifugal pumps in parallel. Although this method can increase the total flow of the system to some extent and maintain partial normal operation when one pump fails, it also brings additional complexity and cost. Each centrifugal pump needs independent pipe connection, control device and occupies more space. In addition, the maintenance and management of multi-pump system are more complex, and therefore need to be improved. CONTENT OF THE UTILITY MODEL

[0003] In view of the deficiencies of the prior art, the present application provides a duplex centrifugal pump to solve the above problems.

[0004] A duplex centrifugal pump, comprising a pump body, a sealing cover and a suspension are respectively installed on the opposite sides of the pump body, a pump cover is installed on the suspension, a driving shaft is rotatably connected on the pump cover, a first impeller and a second impeller are installed on the driving shaft, a partition plate is connected in the pump body, the partition plate divides the pump body into a first pump cavity and a second pump cavity, the driving shaft penetrates the partition plate, the first impeller is located in the first pump cavity, the second impeller is located in the second pump cavity, a water inlet is arranged on the first cavity and the second cavity, and a water outlet is connected to the first cavity and the second cavity.

[0005] By adopting the above technical scheme, the first impeller and the second impeller are installed on the driving shaft and located in the first pump cavity and the second pump cavity divided by the partition plate respectively, when working, the medium enters the first pump cavity and the second pump cavity through the two water inlets respectively, and is jointly collected into the water outlet under the driving of centrifugal force. This layout allows one motor to drive two independently working impellers, thereby realizing higher efficiency and larger flow or pressure output.

[0006] Optionally, a positioning sleeve is sleeved on the driving shaft, the positioning sleeve is located between the first impeller and the second impeller, one end of the positioning sleeve abuts against the first impeller and the other end abuts against the second impeller, a through hole is arranged on the partition plate for the positioning sleeve to penetrate, and the circumferential outer wall of the positioning sleeve is tightly attached to the axial inner wall of the through hole.

[0007] By adopting the technical scheme, the positioning sleeve can ensure that the relative position between the first impeller and the second impeller is fixed and unchanged, and accurate axial positioning is provided. This helps to maintain accurate centering between the impellers, reduces vibration and noise caused by misalignment during operation, and with the help of the positioning sleeve, accurate positioning can be easily achieved when the impellers are installed or replaced, simplifying the assembly process and improving work efficiency.

[0008] Optionally, a limiting nut for abutting against the first impeller is threadedly connected to the end of the driving shaft away from the suspension.

[0009] By adopting the technical scheme, the limiting nut is tightly fixed on the driving shaft through threaded connection, which can effectively fix the first impeller at its designed position and prevent it from moving axially during operation, which ensures accurate alignment between the impeller and the pump body or other key components and stable operation. The use of the limiting nut facilitates quick installation and disassembly when assembling or repairing the first impeller.

[0010] Optionally, a spring washer is sleeved on the driving shaft, and the spring washer is located between the limiting nut and the first impeller.

[0011] By adopting the technical scheme, the spring washer can provide a continuous elastic reaction force, which helps to prevent the limiting nut from gradually loosening due to vibration or impact during operation.

[0012] Optionally, the sealing cover is bolted to the pump body.

[0013] By adopting the technical scheme, the use of bolts to fix the sealing cover can ensure that it tightly fits with the pump body, effectively preventing leakage of working medium or entry of foreign matter into the pump, so that the sealing cover is easy to disassemble and reassemble, thereby facilitating inspection, maintenance or replacement of parts inside the pump. The operation can be completed without complex tools or processes, improving maintenance efficiency and reducing downtime

[0014] Optionally, the suspension is bolted to the pump body, and the pump cover is bolted to the suspension.

[0015] By adopting the technical scheme, this design makes it easy to disassemble and assemble the components of the centrifugal pump, thereby facilitating periodic inspection, maintenance or replacement of parts. If it is necessary to inspect or repair the internal impeller or other key components, the disassembly and assembly operation can be easily performed.

[0016] In summary, the present application has at least one of the following beneficial technical effects:

[0017] 1、The first impeller and the second impeller are installed on the drive shaft and located in the first pump cavity and the second pump cavity divided by the partition plate respectively. During operation, the medium enters the first pump cavity and the second pump cavity through the two water inlets and is jointly collected into the water outlet under the centrifugal force. This layout allows one motor to drive two independently operating impellers, thereby realizing higher efficiency and greater flow or pressure output.

[0018] 2、The positioning sleeve can ensure that the relative position between the first impeller and the second impeller is fixed and unchanged, and provide accurate axial positioning. This helps to maintain the accurate centering between the impellers, reduces vibration and noise caused by misalignment during operation, and with the help of the positioning sleeve, accurate positioning can be easily achieved during installation or replacement of the impeller, simplifying the assembly process and improving work efficiency.

[0019] 3、The limiting nut is tightly fixed on the drive shaft through threaded connection, which can effectively fix the first impeller at its designed position and prevent it from moving axially during operation, which ensures the accurate alignment between the impeller and the pump body or other key components and stable operation. The use of limiting nut facilitates quick installation and disassembly during assembly or maintenance of the first impeller. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0021] Figure 2 is a sectional view schematic diagram of an embodiment of the present application.

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 1、Pump body; 11, first pump cavity; 12, second pump cavity; 13, water inlet; 14, water outlet; 2, sealing cover; 3, suspension; 4, pump cover; 5, drive shaft; 51, first impeller; 52, second impeller; 53, positioning sleeve; 54, limiting nut; 55, spring washer; 6, partition plate. DETAILED DESCRIPTION

[0024] In order to facilitate understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the present specification are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used in the present disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. All publications, patent applications, patents, and other references mentioned in this specification are herein incorporated by reference in their entirety for the purpose of describing and disclosing, for example, the methodologies described in such publications, which might provide useful background to the present application.

[0026] The embodiments of the present application disclose a duplex centrifugal pump. Referring to Figure 1 and Figure 2 , the pump body 1 is provided with a sealing cover 2 and a suspension 3 on the opposite sides thereof by means of bolts.

[0027] Referring to Figure 1 and Figure 2 , the pump cover 4 is fixedly installed on the inner side wall of the suspension 3 by means of bolts. The driving shaft 5 is rotatably connected to the pump cover 4, and the first impeller 51 and the second impeller 52 are installed on the driving shaft 5. The partition plate 6 is fixedly connected in the pump body 1, and the pump body 1 is divided into the first pump cavity 11 and the second pump cavity 12 by the partition plate 6. The driving shaft 5 penetrates through the partition plate 6, the first impeller 51 is located in the first pump cavity 11, and the second impeller 52 is located in the second pump cavity 12. The water inlet 13 is arranged on the first chamber and the second chamber, and the water outlet 14 is arranged to be in communication with the first chamber and the second chamber. The first impeller 51 and the second impeller 52 are installed on the driving shaft 5 and located in the first pump cavity 11 and the second pump cavity 12 divided by the partition plate 6. During operation, the medium enters the first pump cavity 11 and the second pump cavity 12 through the two water inlets 13 and is jointly discharged into the water outlet 14 under the action of centrifugal force. This arrangement allows one motor to drive two independently operating impellers, thereby achieving higher efficiency and greater flow or pressure output. The sealing cover 2 is easy to disassemble and reassemble, thereby facilitating the inspection, repair or replacement of parts inside the pump. The operation can be completed without complex tools or processes, thereby improving the maintenance efficiency and reducing the downtime.

[0028] Referring to Figure 1 and Figure 2 , the positioning sleeve 53 is sleeved on the driving shaft 5 and located between the first impeller 51 and the second impeller 52. One end of the positioning sleeve 53 abuts against the first impeller 51, and the other end of the positioning sleeve 53 abuts against the second impeller 52. The partition plate 6 is provided with a through hole for the positioning sleeve 53 to penetrate through, and the circumferential outer wall of the positioning sleeve 53 is in close contact with the axial inner wall of the through hole. The positioning sleeve 53 can ensure that the relative position between the first impeller 51 and the second impeller 52 is fixed and unchanged, and accurate axial positioning is provided. This helps to maintain the accurate centering between the impellers, reduces the vibration and noise caused by misalignment during operation, and facilitates accurate positioning during the installation or replacement of the impellers with the help of the positioning sleeve 53, thereby simplifying the assembly process and improving the work efficiency.

[0029] With reference to Figure 1 and Figure 2 The end of the drive shaft 5 away from the suspension 3 is threadedly connected with a limiting nut 54 for abutting against the first impeller 51. A spring washer 55 is sleeved on the drive shaft 5 and located between the limiting nut 54 and the first impeller 51. The limiting nut 54 is tightly fixed on the drive shaft 5 through threaded connection, which can effectively fix the first impeller 51 in the designed position and prevent axial movement of the first impeller 51 during operation, which ensures accurate alignment between the impeller and the pump body 1 or other key components and stable operation. The use of the limiting nut 54 facilitates quick installation and disassembly when assembling or repairing the first impeller 51.

[0030] The implementation principle of the embodiment of the double centrifugal pump is that the drive shaft 5 is provided with the first impeller 51 and the second impeller 52, which are respectively located in the first pump cavity 11 and the second pump cavity 12 divided by the partition plate 6. During operation, the medium enters the first pump cavity 11 and the second pump cavity 12 through the two water inlets 13 and is jointly collected into the water outlet 14 under the centrifugal force. This layout allows one motor to drive two independently working impellers, thereby realizing higher efficiency and greater flow or pressure output.

[0031] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Therefore, equivalent changes made on the basis of the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A duplex centrifugal pump characterized by: The utility model provides a pump, including pump body (1), the opposite sides of pump body (1) are installed with sealing cover (2) and suspension (3) respectively, pump cover (4) is installed on suspension (3), rotatingly connected with drive shaft (5) on pump cover (4), first impeller (51) and second impeller (52) are installed on drive shaft (5), connecting with the partition plate (6) in pump body (1), the partition plate (6) divides into first pump cavity (11) and second pump cavity (12) in pump body (1), drive shaft (5) passes through the partition plate (6), first impeller (51) is located in first pump cavity (11), second impeller (52) is located in second pump cavity (12), and first chamber and second chamber are all provided with water inlet (13), and first chamber and second chamber are jointly communicated with water outlet (14).

2. A duplex centrifugal pump according to claim 1, characterized in that: The drive shaft (5) is provided with a positioning sleeve (53), the positioning sleeve (53) is located between the first impeller (51) and the second impeller (52), one end of the positioning sleeve (53) is in contact with the first impeller (51), the other end is in contact with the second impeller (52), the partition plate (6) is provided with a through hole for the positioning sleeve (53) to pass through, and the circumferential outer wall of the positioning sleeve (53) is in close contact with the axial inner wall of the through hole.

3. A duplex centrifugal pump according to claim 2, characterized in that: The drive shaft (5) is provided with a positioning sleeve (53), the positioning sleeve (53) is located between the first impeller (51) and the second impeller (52), one end of the positioning sleeve (53) is in contact with the first impeller (51), the other end is in contact with the second impeller (52), the partition plate (6) is provided with a through hole for the positioning sleeve (53) to pass through, and the circumferential outer wall of the positioning sleeve (53) is in close contact with the axial inner wall of the through hole.

4. A duplex centrifugal pump according to claim 3, characterized in that: The drive shaft (5) is provided with a spring washer (55), and the spring washer (55) is located between the limiting nut (54) and the first impeller (51).

5. A duplex centrifugal pump according to claim 1, characterized in that: The sealing cover (2) is installed on the pump body (1) by bolts.

6. A duplex centrifugal pump according to claim 1, characterized in that: The suspension (3) is installed on the pump body (1) by bolts, and the pump cover (4) is installed on the suspension (3) by bolts.

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