Multi-stage centrifugal pump first-stage guide vane and multi-stage centrifugal pump

Abstract

The utility model discloses a multi-stage centrifugal pump first-stage guide vane and a multi-stage centrifugal pump, and relates to the technical field of centrifugal pumps, the multi-stage centrifugal pump first-stage guide vane is connected with a water inlet section of a pump body, is used for guiding fluid into a first-stage impeller, and comprises a positive guide vane, a middle body, a negative guide vane and a rear cover plate which are axially connected in sequence in the liquid conveying direction, the middle body is connected between the forward guide vane and the reverse guide vane, the rear cover plate is located on the side, away from the middle body, of the reverse guide vane, the forward guide vane is directly installed on the inner wall of the pump body, and the rear cover plate is connected with a next-stage impeller. According to the structure, the first-stage guide vane and the positive guide vane are directly fixed on the inner side of the pump body, and a front cover plate is omitted; the rear cover plate and the secondary guide vane are directly fixed, and a middle partition plate is omitted; according to the pump, an additional axial force balancing device is omitted, so that the pump is simple in structure, small in size and light in weight. An annular ring groove is formed in the outer edge of the rear cover plate, and leakage between the guide vane and the pump body is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal pumps, and in particular relates to a first-stage guide vane of a multi-stage centrifugal pump and a multi-stage centrifugal pump. Background Art

[0002] The common segmented multistage centrifugal pump is a common fluid conveying equipment, which works through multiple impellers in cascade to increase the pump head. In this design, each stage contains an impeller and a guide vane. The function of the guide vane is to guide the fluid at the impeller outlet, improve the flow state, reduce energy loss, and guide the fluid to the next stage impeller.

[0003] The guide vanes of ordinary segmented multistage centrifugal pumps generally have a front cover plate and a rear cover plate. For the first-stage guide vanes, the front cover plate rests on the wall of the pump body of the first-stage segment, and the two walls overlap; in addition, the rear cover plate of the first-stage guide vanes rests on the pump body of the rear-stage segment. The rear cover plate of the first-stage guide vanes and the front cover plate of the rear-stage guide vanes are not in direct contact, and the pump body of the rear-stage segment is in between, and the three walls fit together; conventional guide vanes have no sealing rings and cannot balance the axial force. The axial force requires an additional balancing disc or device to balance, which will increase the volume and weight of the pump body and cannot meet the requirements of light weight and small volume of the pump body in fields such as aerospace.

[0004] To this end, it is necessary to propose a first-stage guide vane of a multi-stage centrifugal pump and a multi-stage centrifugal pump, so as to achieve a more compact and lightweight design while maintaining the high performance of the centrifugal pump, so that the multi-stage centrifugal pump including the first-stage guide vane can adapt to the strict requirements of special fields such as aerospace. Utility Model Content

[0005] The utility model aims to provide a first-stage guide vane of a multistage centrifugal pump and a multistage centrifugal pump, so as to solve the above-mentioned technical problems existing in the prior art.

[0006] To achieve the above-mentioned purpose, in one aspect of the utility model, the utility model provides a first-stage guide vane of a multi-stage centrifugal pump, which is connected to the water inlet section of the pump body and is used to guide the fluid into the first-stage impeller. The first-stage guide vane of the multi-stage centrifugal pump includes a positive guide vane, an intermediate body, a reverse guide vane and a rear cover plate which are axially connected in sequence along the liquid conveying direction, the intermediate body is connected between the positive guide vane and the reverse guide vane, the rear cover plate is located on the side of the reverse guide vane away from the intermediate body, the positive guide vane is directly installed on the inner wall of the pump body, and the rear cover plate is connected to the next-stage impeller.

[0007] Preferably, a front sealing ring is provided on the intermediate body, and the front sealing ring seals the gap with the rear ring of the first-stage impeller.

[0008] Preferably, a positioning ring is provided on a side of the rear cover plate away from the reverse guide vane, and the positioning ring is fixedly connected to the secondary guide vane.

[0009] Preferably, an annular ring groove is provided on the outer edge of the rear cover plate for sealing with the pump body.

[0010] Preferably, a shaft sleeve is provided outside the first-stage impeller, and the intermediate body is sleeved outside the shaft sleeve.

[0011] In another aspect of the utility model, the utility model provides a multi-stage centrifugal pump, including a pump body, a pump shaft is installed in the pump body, the pump body includes a water inlet section, a middle section and a water outlet section which are connected in sequence, the pump shaft is penetrated through the water inlet section, the middle section and the water outlet section, an impeller is installed on the pump shaft in the middle section, the impeller includes a first-stage impeller installed on the pump shaft close to the water inlet section and a plurality of secondary impellers located behind the first-stage impeller, and the periphery of the first-stage impeller is provided with a first-stage guide vane of the multi-stage centrifugal pump described in any of the above items.

[0012] Preferably, a rear sealing ring is provided on the inner side of the rear cover plate, and the rear sealing ring seals the gap with the front ring of the secondary impeller.

[0013] Preferably, secondary guide vanes are provided on the periphery of the secondary impeller, and the secondary guide vanes are symmetrically arranged with the first-stage guide vanes of the multi-stage centrifugal pump.

[0014] Preferably, a plurality of guide vanes located between the secondary impellers are installed in the pump body.

[0015] Compared with the prior art, the present invention at least discloses the following beneficial effects:

[0016] The utility model discloses a first-stage guide vane of a multi-stage centrifugal pump and a multi-stage centrifugal pump, wherein the positive guide vane is directly fixed on the inner side of the pump body, and the front cover plate is omitted; a positioning ring is arranged on the outer side of the rear cover plate, which is directly fixed to the secondary guide vane, and the middle partition plate is omitted; a front sealing ring is arranged on the intermediate body, which is sealed with the gap between the rear ring of the first-stage impeller, and a rear sealing ring is arranged on the inner side of the rear cover plate, which is sealed with the gap between the front ring of the secondary impeller, and the pump omits an additional axial force balancing device, so that the pump has a simple structure, a small volume and a light weight; an annular ring groove is arranged on the outer edge of the rear cover plate to prevent leakage between the guide vane and the pump body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0019] Figure 2A hydraulic diagram of an embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the connection between the embodiment of the utility model and the pump body;

[0021] In the figure: 1. front sealing ring; 2. positive guide vane; 3. intermediate body; 4. reverse guide vane; 5. positioning ring; 6. rear cover plate; 7. rear sealing ring; 8. annular ring groove; 9. secondary guide vane; 10. secondary impeller; 11. shaft sleeve; 12. first-stage impeller; 13. pump body. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In order to overcome the shortcomings of conventional multi-stage centrifugal pumps and guide vane structures that are cumbersome and not concise, the utility model proposes a first-stage guide vane of a multi-stage centrifugal pump and a multi-stage centrifugal pump, which achieves a more compact and lightweight design while maintaining the high performance of the centrifugal pump to meet the strict requirements of special fields such as aerospace. In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Reference Figures 1 to 3 As shown, the utility model provides a first-stage guide vane of a multi-stage centrifugal pump, comprising a positive guide vane 2, an intermediate body 3, a reverse guide vane 4 and a rear cover plate 6. The positive guide vane 2, the intermediate body 3, the reverse guide vane 4 and the rear cover plate 6 are axially connected in sequence along the liquid conveying direction to form a whole, and the positive guide vane 2 is located at the front end of the first-stage guide vane and is directly fixed to the inner wall of the pump body 13. Therefore, the first-stage guide vane has no front cover plate, and there is no other partition between the first-stage guide vane and the secondary guide vane 9, so that the pump structure is simple and light in weight. In order to prevent leakage between the guide vane and the pump body 13, the outer edge of the rear cover plate 6 is sealed with the pump body 13.

[0025] In the above embodiment, the positive guide vane 2 is directly fixed to the inner side of the pump body 13, and the front cover plate is omitted.

[0026] In the above embodiment, the intermediate body 3 is connected between the positive guide vane 2 and the reverse guide vane 4, the rear cover plate 6 is located on the side of the reverse guide vane 4 away from the intermediate body 3, the positive guide vane 2 is directly installed on the inner wall of the pump body 13, and the rear cover plate 6 is connected to the next stage impeller.

[0027] In the above embodiment, the positive guide vane 2 and the reverse guide vane 4 are connected with sealing rings, and the sealing rings and the balancing holes of the first-stage impeller 12 are combined to balance the axial force, thereby reducing the need for additional axial force balancing devices.

[0028] In the above embodiment, the intermediate body 3 is provided with a front sealing ring 1 which seals the gap with the rear ring of the first-stage impeller 12 .

[0029] In the above embodiment, a positioning ring 5 is provided on the side of the rear cover plate 6 away from the reverse guide vane 4, and the positioning ring 5 is fixed to the secondary guide vane 9, and the middle partition is omitted.

[0030] In the above embodiment, a rear sealing ring 7 is provided on the inner circumference of the rear cover plate 6 to seal the gap with the front ring of the secondary impeller 10 .

[0031] In the above embodiment, an annular groove 8 is provided on the outer edge of the rear cover plate 6 for sealing with the pump body 13 to prevent leakage between the guide vanes and the pump body 13 .

[0032] In the above embodiment, the first-stage impeller 12 is provided with a shaft sleeve 11 outside, and the intermediate body 3 is sleeved on the outside of the shaft sleeve 11 .

[0033] In the above embodiment, the first-stage guide vanes and impellers can be made of stainless steel, titanium alloy or other corrosion-resistant materials to extend the service life of the pump. For high-pressure application scenarios, high-strength alloy materials can be used to improve the pressure resistance of the pump.

[0034] In some embodiments, the shape of the first-stage guide vanes is optimized by computational fluid dynamics (CFD) simulation to reduce flow resistance and improve pump efficiency.

[0035] It should be understood that in actual applications, advanced sealing technologies, such as mechanical seals or magnetic seals, can be used to further reduce leakage and improve pump reliability.

[0036] The first-stage guide vane of the multi-stage centrifugal pump based on the above structure makes the pump structure simpler, smaller in size and lighter in weight.

[0037] The utility model also provides a multi-stage centrifugal pump, including a pump body 13, a pump shaft is installed in the pump body 13, the pump body 13 includes a water inlet section, a middle section and a water outlet section which are connected in sequence, the pump shaft is passed through the water inlet section, the middle section and the water outlet section, an impeller is installed on the pump shaft in the middle section, the impeller includes a first-stage impeller 12 installed on the pump shaft close to the water inlet section and a plurality of secondary impellers 10 located behind the first-stage impeller 12, and the periphery of the first-stage impeller 12 is provided with the above-mentioned first-stage guide vanes of the multi-stage centrifugal pump.

[0038] According to a further optimization scheme, a rear sealing ring 7 is provided on the inner side of the rear cover plate 6 , and the rear sealing ring 7 seals the gap with the front ring of the secondary impeller 10 .

[0039] According to a further optimization scheme, secondary guide vanes 9 are provided on the periphery of the secondary impeller 10, and the secondary guide vanes 9 are symmetrically arranged with the first-stage guide vanes of the multi-stage centrifugal pump.

[0040] According to a further optimized solution, a plurality of guide vanes located between the secondary impellers 10 are installed in the pump body 13 .

[0041] In some embodiments, a cooling channel is designed in the pump body 13 to reduce the operating temperature of the pump through the circulation of coolant to prevent overheating damage. For high temperature application scenarios, an external cooling system such as a cooling water jacket or an air cooling system can be added.

[0042] In some embodiments, the pump body 13 is integrated with multiple sensors, such as temperature sensors, pressure sensors, flow sensors, etc., to monitor the operating status of the pump in real time, and to achieve remote monitoring and control through the Internet of Things technology, so as to detect and handle faults in a timely manner.

[0043] In some embodiments, a modular design is used so that guide vanes, impellers and other components can be quickly disassembled and replaced, reducing maintenance time and costs, and has good compatibility, so that the guide vanes, impellers and other components can be shared between pumps of different models.

[0044] The first-stage guide vane of the multistage centrifugal pump disclosed in the embodiment of the utility model and the pump including the first-stage guide vane of the multistage centrifugal pump can be used to transport various chemical media, petrochemical products, food liquids such as milk, juice, beer, etc. It can also be used in water supply systems, fire protection systems or irrigation systems.

[0045] The working principle of the embodiment of the utility model:

[0046] Before starting, the pump is connected to the liquid medium through a connecting pipe. After starting, the liquid medium flows in from the inlet of the pump body 13 and is accelerated and pressurized by the first-stage impeller 12. Subsequently, the liquid is divided into two parts:

[0047] After flowing out of the first-stage impeller 12 , the mainstream flows into the cavity formed by the positive guide vane 2 and the pump body 13 , then flows into the interior of the reverse guide vane 4 , then flows into the secondary impeller 10 and the secondary guide vane 9 , and finally flows out from the outlet of the pump body 13 .

[0048] A small amount of liquid medium flows through the front sealing ring 1, and then flows back into the inlet of the first-stage impeller 12 from the reflux hole of the first-stage impeller 12, forming a small cycle. Similarly, a small amount of liquid flowing out of the secondary impeller 10 leaks from the rear sealing ring 7 to the inlet of the secondary impeller 10, and the above process is repeated to achieve a circular flow.

[0049] The utility model embodiment discloses the following technical effects:

[0050] In order to overcome the shortcomings of conventional multi-stage centrifugal pumps and guide vane structures that are cumbersome and not simple, the utility model proposes a first-stage guide vane of a multi-stage centrifugal pump, the guide vane has no front cover plate, the positive guide vane is directly fixed to the inner wall of the pump body, there is no other partition between the first-stage guide vane and the secondary guide vane, they are directly fixed in contact, a sealing ring is provided for the guide vane, the sealing ring is sealed with the front ring gap of the secondary impeller, the additional axial force balancing device is reduced, the pump structure is simple and the weight is light, in order to prevent leakage between the guide vane and the pump body, a ring groove is provided on the outer edge of the rear cover plate for sealing with the pump body to prevent leakage between the guide vane and the pump body.

[0051] The parts not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0052] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0053] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A first-stage guide vane of a multi-stage centrifugal pump, connected to the water inlet section of a pump body (13), used to guide fluid into a first-stage impeller (12), characterized in that: The first-stage guide vane of the multi-stage centrifugal pump comprises a positive guide vane (2), an intermediate body (3), a reverse guide vane (4) and a rear cover plate (6) which are axially connected in sequence along the liquid conveying direction; the intermediate body (3) is connected between the positive guide vane (2) and the reverse guide vane (4); the rear cover plate (6) is located on a side of the reverse guide vane (4) away from the intermediate body (3); the positive guide vane (2) is directly mounted on the inner wall of the pump body (13); and the rear cover plate (6) is connected to the next-stage impeller.

2. The first-stage guide vane of a multi-stage centrifugal pump according to claim 1, characterized in that: The intermediate body (3) is provided with a front sealing ring (1), and the front sealing ring (1) seals the gap with the rear ring of the first-stage impeller (12).

3. The first-stage guide vane of a multi-stage centrifugal pump according to claim 1, characterized in that: A positioning ring (5) is provided on a side of the rear cover plate (6) away from the reverse guide vane (4), and the positioning ring (5) is fixedly connected to the secondary guide vane (9).

4. The first-stage guide vane of a multi-stage centrifugal pump according to claim 1, characterized in that: An annular groove (8) is provided on the outer edge of the rear cover plate (6) for sealing with the pump body (13).

5. The first-stage guide vane of a multi-stage centrifugal pump according to claim 1, characterized in that: A shaft sleeve (11) is disposed outside the first-stage impeller (12), and the intermediate body (3) is sleeved outside the shaft sleeve (11).

6. A multistage centrifugal pump, comprising a pump body (13), a pump shaft being installed in the pump body (13), the pump body (13) comprising a water inlet section, a middle section and a water outlet section which are connected in sequence, the pump shaft being inserted into the water inlet section, the middle section and the water outlet section, an impeller being installed on the pump shaft in the middle section, the impeller comprising a first-stage impeller (12) installed on the pump shaft near the water inlet section and a plurality of secondary impellers (10) located behind the first-stage impeller (12), characterized in that: The periphery of the first-stage impeller (12) is provided with a first-stage guide vane of the multi-stage centrifugal pump as claimed in any one of claims 1 to 5.

7. The multistage centrifugal pump according to claim 6, characterized in that: A rear sealing ring (7) is provided on the inner side of the rear cover plate (6), and the rear sealing ring (7) seals the gap with the front ring of the secondary impeller (10).

8. The multistage centrifugal pump according to claim 6, characterized in that: The secondary impeller (10) is provided with secondary guide vanes (9) on the periphery thereof, and the secondary guide vanes (9) are symmetrically arranged with the first-stage guide vanes of the multi-stage centrifugal pump.

9. The multistage centrifugal pump according to claim 6, characterized in that: A plurality of guide vanes located between the secondary impellers (10) are installed in the pump body (13).

Images