WO2023151114A1 - Pump body structure and centrifugal pump having same - Google Patents

Abstract

A pump body structure and a centrifugal pump having same. The pump body structure comprises a pump body (10), a pump cover (20), a suspension (30), a main shaft (40) and an impeller (50); the pump body (10) is provided with a pump inlet (11) and a pump outlet (12), and the pump body (10) is further provided with an impeller cavity (13) having an opening towards the side away from the pump inlet (11), the pump inlet (11) and the pump outlet (12) being both communicated with the impeller cavity (13); the pump cover (20) is detachably arranged on the pump body (10) and can seal the opening of the impeller cavity (13), the suspension (30) is arranged on the pump cover (10), and the main shaft (40) is arranged on the suspension (30) and penetrates through the pump cover (20) into the impeller cavity (13); and the impeller (50) is arranged on the main shaft (40) and is located in the impeller cavity (13), the diameter of the impeller (50) being smaller than that of the opening of the impeller cavity (13).

Description

Pump body structure and its centrifugal pump

related application

This application claims the priority of the Chinese patent application filed on February 10, 2022, with the application number 202210125312.X, and the title of the invention is "Pump body structure and centrifugal pump with same", the entire content of which is incorporated in this application by reference middle.

technical field

The present application relates to the technical field related to centrifugal pumps, in particular to a pump body structure and a centrifugal pump having the same.

Background technique

The structure of the current multistage centrifugal pump is mostly divided into several parts according to the order of the liquid inlet end cover, multiple middle sections, pump body and suspension. When the impeller needs to be taken out for maintenance and repair, the liquid inlet end cover and After the impeller nut at the top of the main shaft is disassembled, the middle section and the impellers in the middle section are disassembled one by one from the side of the liquid inlet cover, so as to take out the impeller for subsequent maintenance.

However, since the liquid inlet cap is usually connected and fixed with the customer’s liquid inlet pipe, it is necessary to dismantle the liquid inlet pipe before removing the liquid inlet cap to ensure that the liquid inlet cap has enough space for disassembly. However, because most of the liquid inlet pipes are welded and fixed, it is difficult to remove, which leads to cumbersome disassembly and low efficiency when repairing and maintaining the impeller.

Contents of the invention

Based on this, it is necessary to solve the problem that the current water pump structure needs to remove the welded and fixed water inlet pipe when taking out the impeller, resulting in cumbersome disassembly and low efficiency, and provide a pump body structure that can take out the impeller without removing the water inlet and outlet pipes. Centrifugal pump with it.

The present application provides a pump body structure, including a pump body, a pump cover, a suspension, a main shaft and an impeller; The impeller cavity of the pump, the pump inlet and the pump outlet are both connected to the impeller cavity; the pump cover is detachably arranged on the pump body, and can close the opening of the impeller cavity, and the suspension is set In the pump cover, the main shaft is arranged on the suspension, and passes through the pump cover to the impeller chamber; the impeller is arranged on the main shaft and is located in the impeller chamber, and the impeller The diameter is smaller than the diameter of the opening of the impeller cavity.

The above-mentioned pump body structure, by setting an impeller cavity with an opening diameter larger than the impeller diameter in the pump body, and setting the impeller in the impeller cavity, so that after the pump cover is removed, the main shaft and the impeller can be removed from the pump body together, no need Disassemble the liquid inlet pipeline connected to the pump inlet and mostly fixed by welding to reduce the difficulty of impeller disassembly and facilitate the maintenance of the impeller by the staff.

In one embodiment, the impeller includes a primary impeller and a secondary impeller, and the liquid inlets of the primary impeller and the secondary impeller are in opposite directions.

It can be understood that when the main shaft rotates, the axial forces generated by the primary impeller and the secondary impeller rotate in opposite directions and can cancel each other out, thereby reducing the axial vibration of the main shaft and increasing the operational stability of the centrifugal pump.

In one of the embodiments, the pump body structure further includes a guide assembly arranged on the inner wall of the impeller chamber, and a housing chamber is opened in the guide assembly, the main shaft passes through the housing chamber, and the secondary The first-stage impeller is located in the housing chamber, and the housing chamber has two openings, one of which corresponds to the pump outlet, and the other opening connects the liquid inlet of the secondary impeller and the impeller chamber.

It can be understood that the guide assembly can block the liquid outlet of the secondary impeller, thereby effectively avoiding energy loss or even turbulent flow caused by the collision of the liquid sent out from the liquid outlet of the secondary impeller and the primary impeller.

In one of the embodiments, the flow guide assembly includes an impeller baffle, and the impeller baffle is connected to the inner wall of the impeller cavity to separate the impeller cavity into a primary impeller cavity and a secondary impeller cavity, the The primary impeller and the secondary impeller are respectively located in corresponding cavities, and the pump body is also provided with a through hole communicating the primary impeller cavity and the secondary impeller cavity.

In one of the embodiments, the through hole and the pump outlet are arranged symmetrically with the main shaft as the center, and the end of the through hole communicating with the cavity of the first stage impeller faces the liquid outlet of the first stage impeller.

It can be understood that the pumped liquid flowing out of the first-stage impeller into the first-stage impeller chamber can flow to the secondary impeller chamber along the through hole, avoiding the pumping liquid flowing out of the liquid outlet of the first-stage impeller directly from the pump outlet Situation happens.

In one of the embodiments, the deflector assembly further includes a deflector arranged on the impeller baffle and located in the secondary impeller cavity, and the deflector is formed between the impeller baffle and the impeller baffle. The accommodating cavity, the end surface of the deflector towards the side of the pump cover smoothly transitions to cooperate with the pump cover to form a smooth guide passage between the through hole and the liquid inlet of the secondary impeller.

It can be understood that the pumped liquid flowing out along the through hole can be smoothly delivered to the liquid inlet of the secondary impeller along the guide passage, thereby reducing energy loss or turbulent flow caused by collision.

In one of the embodiments, the inner wall of the impeller cavity has an annular protrusion, the inner end surface of the annular protrusion has a stepped surface facing the side of the pump cover, and the impeller baffle abuts against the stepped surface , the diameter of the first-stage impeller is smaller than the inner diameter of the annular protrusion.

It can be understood that the annular protrusion can act as abutment against the impeller baffle, thereby achieving the effect of limiting the freedom of movement of the impeller baffle and increasing its fixing firmness.

In one embodiment, the end surface of the pump cover near the pump body has a stepped protrusion, and the stepped protrusion can abut against the inner wall of the impeller chamber.

In one of the embodiments, the pump body structure further includes a support seat, and the support seat is respectively fixed to two ends of the pump body with the main shaft as the center.

It can be understood that the two-point support of the support seat can increase the support stability of the pump body, thereby making the operation of the centrifugal pump more stable.

The second aspect of the present application provides a centrifugal pump, which includes the pump body structure described in any one of the above embodiments.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the conventional technology. Obviously, the accompanying drawings in the following description are only examples For some embodiments of the application, those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic cross-sectional structure diagram of a centrifugal pump of the present application in the front view direction.

FIG. 2 is a schematic diagram of an enlarged structure at point A in FIG. 1 .

Fig. 3 is a left view structural diagram of the centrifugal pump of the present application.

Reference signs: 10, pump body; 11, pump inlet; 12, pump outlet; 13, impeller cavity; 131, primary impeller cavity; 132, secondary impeller cavity; 133, annular protrusion; 14, through hole; 20 , pump cover; 21, step protrusion; 30, suspension; 40, main shaft; 50, impeller; 51, first stage impeller; 52, secondary impeller; Plate; 63, deflector; 64, guide passage; 70, support seat.

Detailed ways

In order to make the above-mentioned purpose, features and advantages of the present application more obvious and understandable, the specific implementation manners of the present application will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

It should be noted that when a component is referred to as being “fixed on” or “set on” another component, it may be directly on the other component or there may also be an intervening component. When a component is said to be "connected" to another component, it may be directly connected to the other component or there may be intervening components at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for the purpose of illustration only and do not represent the only implementation Way.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this application, unless otherwise clearly specified and limited, a first feature is "on" or "under" a second feature, which means that the first feature is directly in contact with the second feature, or that the first feature and the second feature are indirectly in contact with each other. contact through an intermediary. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or it just means that the first feature is higher in level than the second feature. "Below", "beneath" and "under" the first feature may mean that the first feature is directly below or obliquely below the second feature, or it just means that the level of the first feature is smaller than that of the second feature.

Unless otherwise defined, all technical and scientific terms used in the description of the present application have the same meaning as commonly understood by those skilled in the technical field of the present application. The terms used in the description of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The term "and/or" used in the specification of the present application includes any and all combinations of one or more related listed items.

The structure of the current multistage centrifugal pump is mostly divided into several parts according to the order of the liquid inlet end cover, multiple middle sections, pump body and suspension. When the impeller needs to be taken out for maintenance and repair, the liquid inlet end cover and After the impeller nut at the top of the main shaft is disassembled, the middle section and the impellers in the middle section are disassembled one by one from the side of the liquid inlet cover, so as to take out the impeller for subsequent maintenance.

However, since the liquid inlet cap is usually connected and fixed with the customer’s liquid inlet pipe, it is necessary to dismantle the liquid inlet pipe before removing the liquid inlet cap to ensure that the liquid inlet cap has enough space for disassembly. However, because most of the liquid inlet pipes are welded and fixed, it is difficult to remove, which leads to cumbersome disassembly and low efficiency when repairing and maintaining the impeller.

In addition, currently it is necessary to perform maintenance on the main shaft or the bearing, and the suspension will be disassembled from the pump body, so that the main shaft and the bearing arranged on the suspension are taken out of the pump body together, and then the main shaft and the bearing are disassembled from the suspension.

However, since the impeller is arranged in the corresponding middle section, and the middle section is fixed between the pump body and the liquid inlet cover, when it is only necessary to take out the main shaft or the bearing for maintenance, it is also necessary to remove it from the side of the liquid inlet cover first. Remove the impeller, and then disassemble the main shaft and bearing from the side of the suspension; otherwise, when the main shaft is disassembled, the main shaft will be unable to move from the impeller and the middle section due to the contact interference between the impeller and the middle section and the middle section and the pump body. Take out the suspension side.

However, first disassemble the impeller from the side of the liquid inlet cover, and then disassemble the main shaft and bearing from the suspension side, which means that both ends of the pump body need to be disassembled, which will greatly complicate the disassembly of the main shaft or bearing. .

In view of the above problems, the present application first provides a pump body structure, please refer to Fig. 1 and Fig. 2, the pump body structure includes a pump body 10, a pump cover 20, a suspension 30, a main shaft 40 and an impeller 50; It has a pump inlet 11 and a pump outlet 12. The pump body 10 is also provided with an impeller chamber 13 that opens to the side away from the pump inlet 11. Both the pump inlet 11 and the pump outlet 12 communicate with the impeller chamber 13; the pump cover 20 is detachably arranged on the The pump body 10 can close the opening of the impeller chamber 13, the suspension 30 is arranged on the pump cover 20, the main shaft 40 is arranged on the suspension 30, and runs through the pump cover 20 to the impeller chamber 13; the impeller 50 is arranged on the main shaft 40 and is located in the impeller The diameter of the impeller 50 is smaller than the diameter of the opening of the impeller chamber 13; the pump inlet 11 is opened along the axial direction of the main shaft 40, and the pump outlet 12 is opened along the radial direction of the main shaft 40.

By opening the impeller chamber 13 with an opening diameter larger than the diameter of the impeller 50 in the pump body 10, and setting the impeller 50 in the impeller chamber 13, after the pump cover 20 is disassembled, the main shaft 40 can be connected to the impeller 50 from the pump body 10. Removed, do not need to disassemble the liquid inlet pipeline connected to the pump inlet 11 and mostly welded and fixed, to reduce the difficulty of disassembling the impeller 50, and facilitate the inspection and maintenance of the impeller 50 by the staff.

In addition, when it is necessary to overhaul and disassemble the main shaft 40 or the bearing, since the impeller 50 can be directly removed from the opening of the impeller cavity 13, only the pump cover 20 on one side of the pump body 10 needs to be disassembled, and the main shaft 40 can be removed. The bearing and the bearing are disassembled from the pump body 10 so as to further disassemble the main shaft 40 or the bearing, which simplifies the disassembly steps of the main shaft 40 or the bearing.

In the embodiment shown in FIG. 2 , the impeller 50 includes a primary impeller 51 and a secondary impeller 52 , and the liquid inlets of the primary impeller 51 and the secondary impeller 52 are facing oppositely; the opening of the impeller 50 along the axial direction of the main shaft 40 is the liquid inlet, the opening along the radial direction of the main shaft 40 is the liquid outlet, the liquid inlet of the primary impeller 51 faces the pump inlet 11 , and the liquid inlet of the secondary impeller 52 faces the pump cover 20 .

The liquid inlets of the primary impeller 51 and the secondary impeller 52 face opposite directions, so that when the main shaft 40 rotates, the axial forces generated by the primary impeller 51 and the secondary impeller 52 rotate in opposite directions and can cancel each other out, thereby reducing the main shaft The axial vibration of 40 increases the running stability of the centrifugal pump.

In the embodiment shown in FIG. 2 , the pump body structure also includes a flow guide assembly 60 arranged on the inner wall of the impeller chamber 13 , the flow guide assembly 60 is provided with an accommodating chamber 61 , the main shaft 40 runs through the accommodating chamber 61 , and the secondary impeller 52 Located in the housing chamber 61, the housing chamber 61 has two openings, one of which corresponds to the pump outlet 12, and the other opening is connected to the liquid inlet of the secondary impeller 52 and the impeller chamber 13, and the flow guiding assembly 60 can move the primary impeller 51 The liquid flowing out of the liquid outlet is guided to the liquid inlet of the secondary impeller 52 .

By setting the secondary impeller 52 in the housing chamber 61, the flow guide assembly 60 can block the liquid outlet of the secondary impeller 52, so as to prevent the pumped liquid sent from the liquid outlet of the primary impeller 51 from flowing backward to the secondary impeller. The outlet of the stage impeller 52; in addition, an opening communicated with the pump outlet 12 is provided through the housing cavity 61, so that the pumping liquid sent from the outlet of the secondary impeller 52 can directly flow out from the pump outlet 12 along the outlet, thereby It effectively avoids energy loss or even turbulent flow caused by the collision of the liquid sent out from the liquid outlet of the secondary impeller 52 and the primary impeller 51 .

In the embodiment shown in FIG. 2 , the flow guide assembly 60 includes an impeller baffle 62 connected to the inner wall of the impeller chamber 13 to separate the impeller chamber 13 into a primary impeller chamber 131 and a secondary impeller chamber 132, The primary impeller 51 and the secondary impeller 52 are respectively located in the corresponding cavity, and the pump body 10 is also provided with a through hole 14 communicating with the primary impeller cavity 131 and the secondary impeller cavity 132; further, the impeller baffle plate 62 and the impeller cavity 13 The inner wall is fixed.

The impeller cavity 13 is divided into the primary impeller cavity 131 and the secondary impeller cavity 132 by the impeller baffle plate 62, avoiding the situation that the pumping liquid flowing out from the liquid outlet of the primary impeller 51 flows directly from the pump outlet 12; A through hole 14 connecting the primary impeller cavity 131 and the secondary impeller cavity 132 is provided in the pump body 10 to guide the flow direction of the pumped liquid, so that the pumping fluid flowing out from the primary impeller 51 to the primary impeller cavity 131 The liquid can flow to the secondary impeller chamber 132 along the through hole 14 , and guided by the guide assembly 60 to the liquid inlet of the secondary impeller 52 , and flow into the secondary impeller 52 .

In the embodiment shown in FIG. 2 , the through hole 14 and the pump outlet 12 are arranged symmetrically with the main shaft 40 as the center, and the end of the through hole 14 communicating with the primary impeller chamber 131 faces the liquid outlet of the primary impeller 51 .

The central symmetrical setting can maximize the distance between the through hole 14 and the pump outlet 12, so as to avoid the situation that the pumped liquid flows into the secondary impeller cavity 132 along the through hole 14, and then directly flows out of the pump outlet 12, so as to ensure the flow into the secondary impeller cavity. The pumped liquid in the impeller chamber 132 can be guided into the secondary impeller 52 under the guidance of the flow guide assembly 60 .

In addition, one end of the through-hole 14 communicated with the first-stage impeller chamber 131 faces the liquid outlet of the first-stage impeller 51, so that the liquid flowing out of the first-stage impeller 51 can flow into the through-hole 14 more smoothly, reducing the pressure caused by the pump. Energy loss or turbulent flow is caused by the collision between the delivery liquid and the inner wall of the first-stage impeller cavity 131 .

In the embodiment shown in FIG. 2 , the deflector assembly 60 further includes a deflector 63 disposed on the impeller baffle 62 and located in the secondary impeller chamber 132 , and an accommodation cavity is formed between the deflector 63 and the impeller baffle 62 61 , the end surface of the deflector 63 toward the side of the pump cover 20 smoothly transitions to cooperate with the pump cover 20 to form a smooth guide passage 64 between the through hole 14 and the liquid inlet of the secondary impeller 52 .

Through the guide passage 64 formed between the deflector 63 and the pump cover 20, the pumped liquid flowing out along the through hole 14 can be smoothly transported to the liquid inlet of the secondary impeller 52 along the guide passage 64, reducing pump pressure. The collision with the inner wall of the secondary impeller cavity 132 or the outer wall of the secondary impeller 52 during the liquid delivery process reduces energy loss or turbulent flow.

In the embodiment shown in FIG. 2, the inner wall of the impeller chamber 13 has an annular protrusion 133, and the inner end surface of the annular protrusion 133 has a stepped surface facing the side of the pump cover 20, and the impeller baffle 62 is in contact with the stepped surface. The diameter of the stage impeller 51 is smaller than the inner diameter of the annular protrusion 133 . Further, the impeller baffle 62 may be fixed to the stepped surface, for example, the impeller baffle 62 is fixed to the annular protrusion 133 through bolts.

Through the abutment and blocking effect of the annular protrusion 133 on the impeller baffle 62, not only the displacement of the impeller baffle 62 along the radial direction of the main shaft 40 can be restricted, but also the direction of the impeller baffle 62 toward the pump inlet 11 along the axial direction of the main shaft 40 can be restricted. Side displacement, and then achieve the effect of fixing the impeller baffle 62.

In the embodiment shown in Fig. 2, the end surface of the pump cover 20 close to the pump body 10 has a stepped protrusion 21, and the stepped protrusion 21 can abut against the inner wall of the impeller chamber 13; 13 The abutment between the inner walls can limit the displacement of the pump cover 20 along the radial direction of the main shaft 40, so as to achieve the effect of increasing the fixing firmness of the pump cover 20, thereby realizing the gap seal and increasing the sealing effect between the pump body and the pump cover .

In the embodiment shown in Fig. 3, the pump body structure also includes a support seat 70, and the support seat 70 is respectively fixed to both ends of the pump body 10 with the main shaft 40 as the center; The support base 70 of the present application can increase the support stability of the pump body 10 through the form of two-point support, thereby making the operation of the centrifugal pump more stable.

The second aspect of the present application provides a centrifugal pump, which includes the above-mentioned pump body structure.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of this application should be based on the appended claims.

Claims (10)

1. A pump body structure, characterized in that it includes a pump body, a pump cover, a suspension, a main shaft and an impeller;

   The pump body has a pump inlet and a pump outlet, and the pump body is also provided with an impeller chamber that opens to a side away from the pump inlet, and both the pump inlet and the pump outlet communicate with the impeller chamber;

   The pump cover is detachably arranged on the pump body, and can close the opening of the impeller cavity, the suspension is arranged on the pump cover, the main shaft is arranged on the suspension, and runs through the pump cover into the impeller cavity;

   The impeller is arranged on the main shaft and located in the impeller cavity, and the diameter of the impeller is smaller than the diameter of the opening of the impeller cavity.
2. The pump body structure according to claim 1, wherein the impeller includes a primary impeller and a secondary impeller, and the liquid inlets of the primary impeller and the secondary impeller face opposite to each other.
3. The pump body structure according to claim 2, characterized in that, the pump body structure further includes a flow guide assembly arranged on the inner wall of the impeller cavity, and a housing chamber is opened in the flow guide assembly, and the main shaft runs through The accommodating cavity, the secondary impeller is located in the accommodating cavity, the accommodating cavity has two openings, one of which corresponds to the pump outlet, and the other opening is connected to the liquid inlet of the secondary impeller and the impeller cavity.
4. The pump body structure according to claim 3, wherein the flow guide assembly includes an impeller baffle, and the impeller baffle is connected to the inner wall of the impeller cavity to divide the impeller cavity into a primary impeller cavity and the secondary impeller cavity, the primary impeller and the secondary impeller are respectively located in the corresponding cavity, and the pump body is also provided with a through hole communicating the primary impeller cavity and the secondary impeller cavity.
5. The pump body structure according to claim 4, wherein the through hole and the pump outlet are arranged symmetrically with the main shaft as the center, and the end of the through hole communicating with the first-stage impeller cavity faces the Liquid outlet of the first stage impeller.
6. The pump body structure according to claim 4, wherein the deflector assembly further comprises a deflector arranged on the impeller baffle and located in the cavity of the secondary impeller, the deflector and the deflector are The accommodating chamber is formed between the impeller baffles, and the end surface of the deflector toward the pump cover is smoothly transitioned to match the pump cover between the through hole and the liquid inlet of the secondary impeller. A smooth guiding path is formed between them.
7. The pump body structure according to claim 4, wherein the inner wall of the impeller chamber has an annular protrusion, and the inner end surface of the annular protrusion has a stepped surface facing the side of the pump cover, and the impeller stop The plate abuts against the stepped surface, and the diameter of the first-stage impeller is smaller than the inner diameter of the annular protrusion.
8. The pump body structure according to claim 1, wherein the end surface of the pump cover close to the pump body has a stepped protrusion, and the stepped protrusion can abut against the inner wall of the impeller chamber.
9. The pump body structure according to claim 1, characterized in that, the pump body structure also includes a support seat, and the support seat is respectively fixed to two ends of the pump body with the main shaft as the center.
10. A centrifugal pump, characterized by comprising the pump body structure according to any one of claims 1-9.

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