Multi-stage pump water outlet section and water pump system

Abstract

The utility model discloses a multi-stage pump water outlet section and a water pump system, and relates to the technical field of multi-stage pumps. The water outlet section of the multistage pump is a volute type water outlet section and comprises a water outlet section shell and a water outlet formed in the side face of the water outlet section shell. One end of the water outlet section shell is provided with an upper seam allowance, the other end of the water outlet section shell is provided with a lower seam allowance, the upper seam allowance is connected with a motor frame seam allowance of the water pump system, and the lower seam allowance is connected with a middle seam allowance of the water pump system, so that the water outlet section shell is fixed in the water pump system; a water outlet volute connected with the water outlet is arranged in the water outlet section shell, and the lower spigot and the water outlet volute are used for containing an impeller. The utility model further discloses a water pump system. The multistage pump water outlet section and the water pump system have the advantages of being compact in structure and capable of reducing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-stage pumps, in particular to a multi-stage pump water outlet section and a water pump system. Background Art

[0002] Centrifugal pumps are widely used in a variety of applications, using the centrifugal force generated by the rotation of their impellers to transport liquids. A multistage pump is a type of centrifugal pump that consists of two or more impellers connected in series on a single shaft. The impeller is the core component of the pump, responsible for transferring energy to the liquid. Each impeller is housed in its own pump casing.

[0003] The pump midsection is a component in a multistage centrifugal pump that connects the inlet and outlet sections to the impellers at each stage. A multistage pump, such as an N-stage pump, includes N-1 midsections. These midsections are divided into primary, secondary, and N-1 stages based on their location. The primary midsection is typically cylindrical, with internal flow channels to accommodate and guide water flow. The primary midsection is located after the first-stage impeller and before the secondary impeller. Multistage pumps often contain multiple impellers, pump casings, and midsections, resulting in a more complex design, higher manufacturing costs, and a relatively large size, occupying more space.

[0004] As the country attaches more importance to energy conservation and emission reduction, users in the market have higher and higher requirements for the efficiency of multi-stage pumps. This requires us to develop products with compact structure and easy maintenance to improve the efficiency of multi-stage pumps and reduce costs.

[0005] Therefore, it is urgent to design a multi-stage pump outlet section and a water pump system to solve the above problems. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a multi-stage pump water outlet section and a water pump system, which has the advantages of compact structure and can reduce costs.

[0007] In order to solve the above technical problems, the utility model provides a multi-stage pump water outlet section, which is a volute-type water outlet section, including a water outlet section shell and a water outlet arranged on the side of the water outlet section shell; one end of the water outlet section shell is provided with an upper stop, and the other end is provided with a lower stop, the upper stop is connected to the motor frame stop of the water pump system, and the lower stop is connected to the middle stop of the water pump system to fix the water outlet section shell in the water pump system; the interior of the water outlet section shell is provided with a water outlet volute connected to the water outlet, and the lower stop and the water outlet volute are used to place an impeller.

[0008] As an improvement to the above solution, one end of the water outlet volute is provided with a first opening for installing the impeller, and the other end of the water outlet volute is provided with a second opening corresponding to the bottom of the impeller.

[0009] As an improvement to the above solution, a sealing ring is provided on the second opening.

[0010] As an improvement to the above solution, the sealing ring is detachably connected to the second opening.

[0011] As an improvement to the above solution, the cross-sectional area of ​​the water outlet gradually increases in a direction away from the water outlet section housing.

[0012] As an improvement to the above solution, the inner wall of the upper stop and the inner wall of the lower stop are both provided with a stepped connection portion.

[0013] As an improvement to the above solution, sealing gaskets are provided between the upper stop and the motor frame stop, and between the lower stop and the middle stop.

[0014] As an improvement to the above solution, the sealing gasket is provided on the stepped connection portion.

[0015] The utility model also discloses a water pump system, including a water pump system body, the water pump system body including a water pump motor, a rotating assembly connected to the output end of the water pump motor, a motor frame stop and a middle stop, and the above-mentioned multi-stage pump water outlet section; the upper stop of the multi-stage pump water outlet section is connected to the motor frame stop, and the lower stop of the multi-stage pump water outlet section is connected to the middle stop to fix the water outlet section shell of the multi-stage pump water outlet section in the water pump system; the rotating assembly includes a rotating shaft located in the middle and a plurality of impellers connected to the rotating shaft, and the rotating shaft drives the impellers to rotate under the drive of the water pump motor.

[0016] The beneficial effects of implementing the present invention are:

[0017] The water outlet section of the multi-stage pump of the utility model is a volute type water outlet section, and the water outlet guide vane is no longer used as the extrusion chamber. In addition, the lower stop is matched with the middle stop to replace the first-stage middle section, making the water pump system more compact and reducing the cost of the water pump system.

[0018] Furthermore, the utility model provides a detachable sealing ring at the water outlet section of the multi-stage pump, which is convenient for maintenance and can reduce the gap between the second opening and the bottom of the impeller, thereby improving the efficiency of the pump and reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the water outlet section of the multi-stage pump of the utility model;

[0020] Figure 2 for Figure 1 Middle AA section view;

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the water pump system of the present utility model. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear in this document are based solely on the accompanying drawings and are not intended to limit the present invention.

[0023] like Figures 1 to 3 As shown, the water outlet section of the multi-stage pump of the present invention is a volute type water outlet section, comprising a water outlet section housing 1 and a water outlet 2 provided on the side of the water outlet section housing 1;

[0024] An upper stop 11 is provided at one end of the water outlet section housing 1, and a lower stop 12 is provided at the other end. The upper stop 11 is connected to the motor frame stop 3 of the water pump system, and the lower stop 12 is connected to the middle stop 4 of the water pump system to fix the water outlet section housing 1 in the water pump system;

[0025] A water outlet volute 13 connected to the water outlet 2 is provided inside the water outlet section housing 1 , and the lower stop 12 and the water outlet volute 13 are used to place the impeller 5 .

[0026] The water outlet section of the multi-stage pump of the present invention is a volute type water outlet section, and the water outlet guide vane is no longer used as the extrusion chamber. In addition, the lower stop 12 is combined with the middle stop 4 to replace the first-stage middle section, making the water pump system more compact and reducing the cost of the water pump system.

[0027] It should be noted that the middle section of the pump refers to a component in a multi-stage centrifugal pump, which is the main component connecting the inlet and outlet sections and the impellers at each stage. In a multi-stage pump, such as an N-stage pump, it includes N-1 middle sections. According to the position of the middle section, it can be divided into the first-stage middle section, the second-stage middle section, and the N-1-stage middle section. The first-stage middle section is usually long and cylindrical, with a flow channel designed inside to accommodate and guide the water flow. The first-stage middle section is located after the first-stage impeller of the pump and before the second-stage impeller. In the prior art, the water flows out from the last-stage impeller, passes through the water outlet guide vane, and then flows through the annular water outlet section for output; while in the water outlet section of the multi-stage pump of the present invention, the water flow is directly output through the volute-type extrusion chamber, and the fluid state and pressure distribution of the water flow are greatly improved, thereby improving the efficiency of the entire water pump system.

[0028] Specifically, one end of the water outlet volute 13 is provided with a first opening 131 for installing the impeller 5 , and the other end of the water outlet volute 13 is provided with a second opening 132 corresponding to the bottom of the impeller 5 .

[0029] A sealing ring 132a is provided on the second opening 132 to reduce the gap between the second opening 132 and the bottom of the impeller 5, thereby reducing the possibility of the working medium passing through the gap, thereby improving the efficiency of the pump and reducing energy loss.

[0030] It should be noted that when the impeller 5 rotates, a very small gap is formed between the outer edge of the impeller 5 and the second opening 132. This gap needs to be precisely controlled to ensure efficient operation of the pump. If the gap is too large, the efficiency of the pump will be reduced; if the gap is too small, it may cause friction or wear between the impeller 5 and the second opening 132. The material of the sealing ring 132a is metal, including gray cast iron, cast steel, and stainless steel. In addition, according to specific requirements and taking into account its wear resistance, the material of the sealing ring 132a can also be silicon nitride, polytetrafluoroethylene, etc.

[0031] More preferably, the sealing ring 132a is detachably connected to the second opening 132 so that it can be replaced after being worn to restore the performance of the pump. The specific method of detachable connection can be:

[0032] Threaded connection: The sealing ring 132a is threadedly engaged with the corresponding thread of the second opening 132 and can be tightened or loosened by rotation, making it easy to disassemble and install;

[0033] Snap ring or slot connection: The second opening 132 is provided with a snap ring or slot, and the sealing ring 132a is provided with a corresponding protrusion or groove, which is fixed by snapping in;

[0034] Bolt connection: Bolt holes are opened at appropriate positions of the second opening 132 and the sealing ring 132 a , and the sealing ring 132 a is fixed to the second opening 132 by bolts.

[0035] The cross-sectional area of ​​the water outlet 22 gradually increases in a direction away from the water outlet housing 1. The gradual increase in the cross-sectional area of ​​the water outlet 22 helps to reduce the water flow velocity, reduce the head loss, and improve the energy efficiency of the pump. It also helps to reduce the pressure fluctuation at the outlet and improve the operational stability of the pump.

[0036] In order to strengthen the connection with the motor frame stop 3 and the middle stop 4, the inner wall of the upper stop 11 and the inner wall of the lower stop 12 are provided with a stepped connection part 14. The setting of the stepped connection part 14 enhances the connection strength between the water outlet section shell 1 and the motor frame stop 3 and the middle stop 4, improves the stability and durability of the pump structure, and also helps to disperse and withstand the force generated by the pump during operation.

[0037] To enhance sealing, sealing gaskets 141 are provided between the upper stop 11 and the motor frame stop 3, and between the lower stop 12 and the middle stop 4. The sealing ring 132a can be made of rubber, or other materials suitable for the specific environment. For example, flexible graphite gaskets offer excellent corrosion resistance and sealing properties, suitable for a variety of media; polytetrafluoroethylene offers excellent corrosion resistance and high temperature resistance, suitable for media such as strong acids, strong bases, halogens, and pharmaceuticals.

[0038] The sealing gasket 141 is provided on the stepped connection portion 14 , which can better adapt to the gap between the connection components, ensure the tightness of the seal, reduce the risk of leakage, and also facilitate the installation and replacement of the sealing gasket 141 .

[0039] like Figure 3 As shown, the utility model also discloses a water pump system, including a water pump system body, the water pump system body including a water pump motor (not shown in the figure), a rotating assembly connected to the output end of the water pump motor, a motor frame stop 3 and a middle stop 4, and the above-mentioned multi-stage pump water outlet section;

[0040] The upper stopper 11 of the multi-stage pump outlet section is connected to the stopper 3 of the motor frame, and the lower stopper 12 of the multi-stage pump outlet section is connected to the middle stopper 4 to fix the outlet section housing 1 of the multi-stage pump outlet section in the water pump system;

[0041] The rotating assembly includes a rotating shaft 6 located in the middle and a plurality of impellers 5 connected to the rotating shaft 6. The rotating shaft 6 drives the impellers 5 to rotate when driven by the water pump motor.

[0042] In summary, the multi-stage pump discharge section of the present invention is a volute-type discharge section, which no longer uses discharge guide vanes as the discharge chamber. Furthermore, the lower stop 12, in conjunction with the middle stop 4, replaces the first-stage middle section, making the pump system more compact and reducing the cost of the pump system. Furthermore, the multi-stage pump discharge section of the present invention is provided with a removable sealing ring 132a for ease of maintenance. This reduces the gap between the second opening 132 and the bottom of the impeller 5, thereby reducing the possibility of the working medium passing through this gap, thereby improving pump efficiency and reducing energy loss.

[0043] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A multi-stage pump outlet section, characterized in that: The water outlet section of the multi-stage pump is a volute type water outlet section, comprising a water outlet section housing and a water outlet provided on the side of the water outlet section housing; An upper stop is provided at one end of the water outlet section housing, and a lower stop is provided at the other end. The upper stop is connected to the stop of the motor frame of the water pump system, and the lower stop is connected to the middle stop of the water pump system to fix the water outlet section housing in the water pump system; A water outlet volute connected to the water outlet is provided inside the water outlet section housing, and the lower stop and the water outlet volute are used to place an impeller.

2. The multi-stage pump outlet section according to claim 1, characterized in that: One end of the water outlet volute is provided with a first opening for installing the impeller, and the other end of the water outlet volute is provided with a second opening corresponding to the bottom of the impeller.

3. The water outlet section of the multi-stage pump according to claim 2, characterized in that: A sealing ring is provided on the second opening.

4. The water outlet section of the multi-stage pump according to claim 3, characterized in that: The sealing ring is detachably connected to the second opening.

5. The water outlet section of the multi-stage pump according to claim 1, characterized in that: The cross-sectional area of ​​the water outlet gradually increases in a direction away from the water outlet section housing.

6. The water outlet section of the multi-stage pump according to claim 1, characterized in that: The inner wall of the upper stop and the inner wall of the lower stop are both provided with stepped connecting parts.

7. The water outlet section of the multi-stage pump according to claim 6, characterized in that: Sealing gaskets are provided between the upper stop and the motor frame stop, and between the lower stop and the middle stop.

8. The water outlet section of the multi-stage pump according to claim 7, characterized in that: The sealing gasket is arranged on the stepped connection portion.

9. A water pump system, characterized in that: The water pump system comprises a water pump motor, a rotating assembly connected to the output end of the water pump motor, a motor frame stop and a middle stop, and a multi-stage pump outlet section according to any one of claims 1 to 8; The upper stopper of the multi-stage pump outlet section is connected to the stopper of the motor frame, and the lower stopper of the multi-stage pump outlet section is connected to the middle stopper, so as to fix the outlet section housing of the multi-stage pump outlet section in the water pump system; The rotating assembly includes a rotating shaft located in the middle and a plurality of impellers connected to the rotating shaft. The rotating shaft drives the impellers to rotate under the drive of the water pump motor.

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