Pump base of multi-stage centrifugal pump and multi-stage centrifugal pump

Abstract

The utility model discloses a pump seat of a multi-stage centrifugal pump and the multi-stage centrifugal pump, which can prevent the end part of an output joint from cracking when a water pipe is mounted. The pump base of the multi-stage centrifugal pump comprises a base body and an output connector which is connected to the base body and deviates outwards from the base body, the top of the base body is used for being installed with a motor in a butt joint mode, the lower end of the base body is used for being installed with a centrifugal pump in a butt joint mode, the base body is provided with a vertically-through installation through hole, and output flow channels are arranged in the output connector and the base body. A threaded structure used for being connected with a water pipe is formed on the inner wall of the portion, on the output connector, of the output flow channel, and a certain distance is reserved between the tail end of the threaded structure and the end of the output connector.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pumps, and more particularly to the pump base and multistage centrifugal pump. Background Technology

[0002] A centrifugal pump is a pump that uses the centrifugal force generated by the rotation of an impeller to transport liquids. A multistage centrifugal pump is a combination of two or more centrifugal pumps with the same function. In terms of fluid channel structure, the medium pressure relief port of the first stage is connected to the inlet of the second stage, and the medium pressure relief port of the second stage is connected to the inlet of the third stage. This series connection forms a multistage centrifugal pump. Multistage centrifugal pumps can meet different requirements by changing the number of pump stages (i.e., changing the number of impellers), so they have a wide range of applications.

[0003] A multistage centrifugal pump mainly consists of a motor, pump base, shaft, guide vane, and impeller. The high-speed rotation of the motor drives the shaft via a coupling, which in turn drives the impeller. Liquid is drawn into the first-stage impeller and then guided through the guide vane to the inlet of the next-stage impeller, and so on. This process continuously increases the liquid's energy, resulting in a higher head. The pump base has an output connector for connecting to a water pipe. The output connector has internal threads to strengthen the connection; however, the threads extend to the end of the output connector. When the water pipe is inserted, it exerts significant pressure on the end of the connector, potentially causing it to crack.

[0004] Therefore, there is an urgent need for a pump base and a multi-stage centrifugal pump that prevents the end of the output connector from cracking when water pipes are installed, in order to overcome the above-mentioned defects. Utility Model Content

[0005] The purpose of this invention is to provide a pump base that prevents the end of the output connector from cracking when a water pipe is installed.

[0006] Another objective of this invention is to provide a multi-stage centrifugal pump that prevents the end of the output connector from cracking when a water pipe is installed.

[0007] To achieve the above objectives, the multi-stage centrifugal pump base provided by this utility model includes a base body and an output connector that is connected to the base body and extends outward from it. The top of the base body is used for docking and installation with a motor, and the lower end of the base body is used for docking and installation with a centrifugal pump body. The base body is provided with a through mounting hole that extends vertically. The output connector and the base body are provided with an output flow channel. The inner wall of the output flow channel in the part of the output connector has a threaded structure for connecting with a water pipe. The tail end of the threaded structure is a certain distance away from the end of the output connector.

[0008] Preferably, a clearance step structure is provided between the tail end of the thread structure and the end of the output connector. The diameter of the clearance step structure is larger than the diameter of the part where the thread structure is located, and the thread structure is a tapered thread.

[0009] Preferably, the output channel extends to the bottom of the base and is configured in a bent manner.

[0010] Preferably, the outer wall of the end of the output connector is chamfered, and the top of the output connector has a beveled structure at the part adjacent to the base.

[0011] Preferably, the base includes an upper base structure, a middle base structure, and a lower base structure connected sequentially from top to bottom. The upper base structure and the lower base structure are hollowed out, and the mounting through hole passes through the upper base structure, the middle base structure, and the lower base structure sequentially from top to bottom.

[0012] Preferably, the top of the upper structure has a mating boss that protrudes upwards, and the mounting through hole also penetrates the mating boss.

[0013] Preferably, the bottom of the lower structure is recessed to form an output groove, and the output flow channel communicates with the output groove.

[0014] Preferably, the output connector is also connected to the upper structure and the lower structure respectively. The upper structure is connected to the middle structure through several upper connectors. The upper structure and the middle structure enclose an upper structure space. The upper connectors are spaced apart and form an upper structure gap that communicates with the upper structure space.

[0015] Preferably, the middle support structure is connected to the lower support structure through several lower connecting bodies, and a lower structure space is enclosed between the middle support structure and the lower support structure. The lower connecting bodies are arranged at intervals and form a lower structure gap that communicates with the lower structure space between them.

[0016] To achieve the second objective mentioned above, this utility model also provides a multi-stage centrifugal pump, including a motor, a rotating shaft, several centrifugal pump bodies connected in sequence, and a pump base for the multi-stage centrifugal pump. The rotating shaft is mounted in a mounting through hole and rotatably disposed on the pump base. The motor is mounted on the top of the pump base, and the rotating shaft is connected to the output end of the motor. The motor drives the rotating shaft to rotate. Each stage of the centrifugal pump body includes a middle section housing and an impeller and guide vanes disposed within the housing. The guide vanes are connected to the middle section housing, and the impeller is mounted on the rotating shaft.

[0017] Compared with the prior art, in this utility model, the inner wall of the output connector is formed with a threaded structure in the output channel. The tail end of the threaded structure is a certain distance away from the end of the output connector. At this time, the tail end of the threaded structure is far away from the end of the output connector. When the water pipe is installed, the water pipe will not and cannot squeeze the end of the output connector, thus preventing the end of the output connector from cracking. Attached Figure Description

[0018] Figure 1 This is a perspective view of the multistage centrifugal pump of this utility model.

[0019] Figure 2This is a left view of the multistage centrifugal pump of this utility model.

[0020] Figure 3 This utility model relates to a multi-stage centrifugal pump. Figure 2 The sectional view obtained after cutting along line segment AA.

[0021] Figure 4 This is a perspective view of the pump base of the multistage centrifugal pump of this utility model.

[0022] Figure 5 This is a perspective view of the pump base of this utility model when it is at another angle.

[0023] Figure 6 This is a perspective view of the pump base of this utility model when it is at another angle.

[0024] Figure 7 This is a left view of the pump base of this utility model.

[0025] Figure 8 This utility model relates to the pump seat edge Figure 7 The sectional view obtained after cutting the middle BB line segment. Detailed Implementation

[0026] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0027] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model provides a multi-stage centrifugal pump 100, including a motor 10, a rotating shaft 20, several stages of centrifugal pump bodies 30 connected in sequence, and a pump base 40 for the multi-stage centrifugal pump (hereinafter referred to as the pump body for ease of description). The pump base 40 has a through-hole 411 extending vertically (see below for details). The rotating shaft 20 is mounted in the through-hole 411 and is rotatably mounted on the pump base 40. The motor 10 is mounted on the top of the pump base 40, and the rotating shaft 20 is connected to the output end of the motor 10, driving the rotating shaft 20 to rotate. Each stage of the centrifugal pump body 30 includes a middle section housing 31 and an impeller 32 and a guide vane 33 disposed within the middle section housing 31. The guide vane 33 is connected to the middle section housing 31, and the impeller 32 is mounted on the rotating shaft 20. The motor 10 drives the shaft 20 to rotate, which in turn drives the impeller 32 to rotate within the intermediate housing 31. This allows the liquid to be drawn into the first-stage impeller 32 and then guided through the intermediate housing 31 to the inlet of the next-stage impeller 32, and so on. In this way, the energy of the liquid continuously increases, resulting in a higher head. Preferably, the multi-stage centrifugal pump 100 provided by this invention includes a total of three centrifugal pump bodies 30, but this number is not a limitation.

[0028] This utility model mainly proposes improvements to the pump base 40 of a multi-stage centrifugal pump, which will be described in detail below.

[0029] like Figures 1 to 8 As shown, the pump base 40 of the multi-stage centrifugal pump of this utility model includes a base body 41 and an output connector 42 that extends outward from the base body 41. The top of the base body 41 is used for docking and mounting with the motor 10, and the lower end of the base body 41 is used for docking and mounting with the centrifugal pump body 30. The base body 41 has a through-hole 411 extending vertically. The output connector 42 and the base body 41 have an output flow channel 43. The inner wall of the output flow channel 43 of the output connector 42 has a threaded structure 44 for connecting with a water pipe. The tail end of the threaded structure 44 is a certain distance away from the end of the output connector 42. The pumped liquid flows out from the output flow channel 43. After the output connector 42 is docked with the water pipe, the liquid flows into the water pipe for external transportation. The water pipe and the output connector 42 are connected by the threaded structure 44, and the connection is stable and firm, and not easy to loosen.

[0030] In this utility model, the inner wall of the output channel 43 on the part of the output connector 42 is formed with a threaded structure 44. The tail end of the threaded structure 44 is a certain distance away from the end of the output connector 42. At this time, the tail end of the threaded structure 44 is far away from the end of the output connector 42. When the water pipe is installed, the water pipe will not and cannot squeeze the end of the output connector 42, thus preventing the end of the output connector 42 from cracking.

[0031] Preferably, a clearance step structure 45 is provided between the tail end of the threaded structure 44 and the end of the output connector 42. The diameter of the clearance step structure 45 is larger than the diameter of the part where the threaded structure 44 is located. In this case, the clearance step structure 45 ensures that the tail end of the threaded structure 44 and the end of the output connector 42 are separated by a certain distance. This clearance step structure 45 will not be squeezed by the water pipe and will not be subjected to stress, thus preventing the end of the output connector 42 from cracking. Preferably, the threaded structure 44 is a tapered thread to enable a more stable connection between the output connector 42 and the water pipe.

[0032] like Figure 3 and Figure 8 As shown, the output channel 43 extends to the bottom of the base 41, and the output channel 43 is bent.

[0033] like Figures 1 to 8 As shown, the outer wall of the end of the output connector 42 is provided with a chamfer 421, and the top of the output connector 42 is provided with a bevel structure 422 at the part adjacent to the seat body 41. The chamfer 421 facilitates the insertion of the water pipe into the output channel 43 of the output connector 42, and the bevel structure 422 can help and facilitate the insertion of the water pipe into the output channel 43 of the output connector 42.

[0034] like Figures 1 to 8As shown, the base 41 includes an upper base structure 412, a middle base structure 413, and a lower base structure 414 connected sequentially from top to bottom. The upper base structure 412 and the lower base structure 414 are hollowed out, with a mounting through hole 411 passing through them sequentially from top to bottom. Hollowing out the upper base structure 412 and the lower base structure 414 effectively reduces the overall weight of the base 41, making the device lighter. Preferably, the base 41 is made of metal, such as a metal casting, but it can also be made of plastic depending on the actual needs.

[0035] Furthermore, a mating boss 415 protrudes upward from the top of the upper structure 412, and a mounting through hole 411 penetrates the mating boss 415. The mating boss 415 provides better support for the rotating shaft 20, enhancing its structural stability. Preferably, the mating boss 415 is roughly cylindrical, but it is not limited to this shape. The bottom of the lower structure 414 is recessed to form an output groove 416, and the output flow channel 43 communicates with the output groove 416. The output groove 416 allows for temporary storage of the pumped liquid, facilitating better liquid distribution.

[0036] like Figures 1 to 8 As shown, the middle base structure 413 is generally disc-shaped, but not limited to this. The output connector 42 is also connected to the upper base structure 412 and the lower base structure 414 respectively. The upper base structure 412 is connected to the middle base structure 413 through several upper connectors 417. An upper structural space 401 is formed between the upper base structure 412 and the middle base structure 413. The upper connectors 417 are spaced apart and form an upper structural notch 402 that communicates with the upper structural space 401. The upper structural space 401 and the upper structural notch 402 allow the upper base structure 412 to be hollowed out. The upper base structure 412 is generally disc-shaped, but not limited to this.

[0037] like Figures 1 to 8 As shown, the middle base structure 413 is connected to the lower base structure 414 via several lower connecting bodies 419. A lower structural space 403 is formed between the middle base structure 413 and the lower base structure 414. The lower connecting bodies 419 are spaced apart, forming a lower structural notch 404 that communicates with the lower structural space 403. The lower structural space 403 and the lower structural notch 404 allow the lower base structure 414 to be hollowed out. The lower base structure 414 is generally disc-shaped, but not limited to this.

[0038] The following is a brief description of the working process of the multistage centrifugal pump 100 of this utility model: The motor 10 drives the rotating shaft 20 to rotate, which in turn drives the impeller 32 to rotate at high speed within the intermediate housing 31. After the liquid is drawn into the first-stage impeller 32, it is guided through the intermediate housing 31 to the next-stage impeller 32, and so on. In this way, the energy of the liquid continuously increases, resulting in a higher head. The pumped liquid flows into the output groove 416 and then into the output channel 43, and finally is pumped to the water pipe for output.

[0039] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. A pump base for a multistage centrifugal pump, characterized in that: The device includes a base and an output connector that extends outward from the base. The top of the base is used for docking with a motor, and the bottom of the base is used for docking with a centrifugal pump body. The base has a through-hole that extends vertically. The output connector and the base have an output channel. The inner wall of the output channel in the portion of the output connector has a threaded structure for connecting with a water pipe. The tail end of the threaded structure is a certain distance away from the end of the output connector.

2. The pump base of the multi-stage centrifugal pump according to claim 1, characterized in that, A clearance step structure is provided between the tail end of the threaded structure and the end of the output connector. The diameter of the clearance step structure is larger than the diameter of the part where the threaded structure is located. The threaded structure is a tapered thread.

3. The pump base of the multi-stage centrifugal pump according to claim 1, characterized in that, The output channel extends to the bottom of the base and is bent.

4. The pump base of the multi-stage centrifugal pump according to claim 1, characterized in that, The outer wall of the end of the output connector is chamfered, and the top of the output connector has a beveled structure at the part adjacent to the base.

5. The pump base of the multistage centrifugal pump according to claim 1, characterized in that, The base includes an upper base structure, a middle base structure, and a lower base structure connected sequentially from top to bottom. The upper base structure and the lower base structure are hollowed out, and the mounting through hole passes through the upper base structure, the middle base structure, and the lower base structure sequentially from top to bottom.

6. The pump base of the multi-stage centrifugal pump according to claim 5, characterized in that, The top of the upper structure has an upwardly protruding docking boss, and the mounting through hole also penetrates the docking boss.

7. The pump base of the multi-stage centrifugal pump according to claim 5, characterized in that, The bottom of the lower structure is recessed to form an output groove, and the output channel communicates with the output groove.

8. The pump base of the multi-stage centrifugal pump according to claim 5, characterized in that, The output connector is also connected to the upper seat structure and the lower seat structure respectively. The upper seat structure is connected to the middle seat structure through a number of upper connectors. An upper structure space is enclosed between the upper seat structure and the middle seat structure. The upper connectors are spaced apart and form an upper structure gap that communicates with the upper structure space between them.

9. The pump base of the multistage centrifugal pump according to claim 5, characterized in that, The middle base structure is connected to the lower base structure through several lower connecting bodies. The middle base structure and the lower base structure enclose a lower structure space. The lower connecting bodies are spaced apart and form a lower structure gap that communicates with the lower structure space between them.

10. A multistage centrifugal pump, characterized in that, The pump includes a motor, a rotating shaft, a plurality of centrifugal pump bodies connected in sequence, and a pump base for a multi-stage centrifugal pump as described in any one of claims 1-9. The rotating shaft is mounted in the mounting through hole and is rotatably disposed on the pump base. The motor is mounted on the top of the pump base, and the rotating shaft is connected to the output end of the motor. The motor drives the rotating shaft to rotate. Each stage of the centrifugal pump body includes a middle section housing and an impeller and guide vanes disposed within the housing. The guide vanes are connected to the middle section housing, and the impeller is mounted on the rotating shaft.

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