CN211398046U

CN211398046U - Volute and centrifugal pump with same

Info

Publication number: CN211398046U
Application number: CN201922204123.8U
Authority: CN
Inventors: 周慧慧; 胡小文; 胡斯特; 戴龙珍; 刘日超; 谭发刚; 张辉
Original assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-09-01
Anticipated expiration: 2029-12-09

Abstract

The utility model discloses a spiral case and centrifugal pump that has it, the spiral case includes: the volute comprises a volute body, wherein a fluid inlet and an outlet pipe are arranged on the volute body, an eccentric volute chamber and an installation cavity for assembling a centrifugal impeller, which are communicated with each other, are defined in the volute body, and the fluid inlet is positioned on the side wall of the installation cavity; the eccentric volute chamber is internally provided with a matching part extending towards the fluid inlet, the centrifugal impeller is installed on the matching part to be connected with the motor, an eccentric flow channel communicated with the outlet pipe is limited by the outer peripheral wall of the matching part and the inner peripheral wall of the eccentric volute chamber, and the cross-sectional area of the matching part is gradually reduced in the flowing direction of the fluid. The utility model discloses a spiral case, when satisfying fluidic basic flow characteristic and guaranteeing the fluidic flow efficiency in the spiral case, the total volume of spiral case is less relatively, and occupation space is little, is favorable to using the miniaturization of the pump body of spiral case, is favorable to reducing the quantity of the manufacturing material of spiral case simultaneously, reduces the manufacturing cost of spiral case.

Description

Volute and centrifugal pump with same

Technical Field

The utility model belongs to the technical field of the technique of centrifugal pump and specifically relates to a spiral case and centrifugal pump that has it is related to.

Background

Most of the volutes in the related art adopt a design method of equal annular volume to meet the basic flow characteristics of the fluid. Wherein the cross-sectional area of the flow passage in the volute is continuously increased. Specifically, no matter be the spiral case internal diameter size (the radius of cooperation portion) of symmetry spiral case structure or eccentric spiral case structure all remain unchanged, and the cross-section of runner constantly develops to the outside to make the continuous increase of spiral case external diameter size (the distance between the internal perisporium of runner and the central axis of cooperation portion), make the continuous outside extension of periphery wall of spiral case from this, and then make the overall volume of spiral case big, occupation space is big, and the preparation material quantity is big, and product cost is higher.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide a spiral case, which satisfies the basic flow characteristic of the fluid and ensures the flow efficiency of the fluid in the spiral case, the total volume of the spiral case is relatively small, the occupied space is small, thereby being beneficial to the miniaturization of the pump body of the spiral case, and simultaneously being beneficial to reducing the amount of the manufacturing material of the spiral case, and reducing the manufacturing cost of the spiral case.

The utility model also provides a centrifugal pump, including foretell spiral case.

According to the utility model discloses spiral case, include: the volute comprises a volute body, wherein a fluid inlet and an outlet pipe are arranged on the volute body, an eccentric volute chamber and an installation chamber for assembling a centrifugal impeller, which are communicated with each other, are defined in the volute body, and the fluid inlet is positioned on the side wall of the installation chamber; the eccentric volute chamber is internally provided with a matching part extending towards the fluid inlet, the centrifugal impeller is mounted on the matching part to be connected with the motor, the outer peripheral wall of the matching part and the inner peripheral wall of the eccentric volute chamber define an eccentric flow channel communicated with the outlet pipe, and the cross-sectional area of the matching part is gradually reduced in the flowing direction of the fluid.

According to the utility model discloses the spiral case, in the flow direction of fluid, the cross-sectional area of cooperation portion reduces gradually to make the cross-sectional area of eccentric runner be crescent on fluidic flow direction, can satisfy fluidic basic flow characteristic from this and guarantee the fluidic flow efficiency in the spiral case, the total volume of spiral case is less relatively, occupation space is little, thereby be favorable to using the miniaturization of the pump body of spiral case, be favorable to reducing the quantity of the manufacturing material of spiral case simultaneously, reduce the manufacturing cost of spiral case.

According to some embodiments of the present invention, a partition is disposed on an end of the fitting portion close to the fluid inlet, an extending direction of the partition is perpendicular to an extending direction of the fitting portion to separate the installation chamber from the eccentric volute chamber, and at least a portion of an outer peripheral wall of the partition is spaced apart from an inner peripheral wall of the volute body to define an inlet of the eccentric volute chamber.

In some embodiments of the present invention, on the same projection plane perpendicular to the extending direction of the fitting portion, the orthographic projection of the centrifugal impeller is located inside the orthographic projection of the partition plate.

In some embodiments of the present invention, a volute tongue is disposed on the volute body, and the volute tongue is located in the installation chamber and extends to the partition plate along the central axis of the fluid inlet.

In some embodiments of the present invention, the junction of the volute tongue and the inner circumferential wall of the mounting chamber is in a circular arc transition.

According to some embodiments of the utility model, be equipped with water conservancy diversion portion on the spiral case body on the fluidic flow direction, the water conservancy diversion portion is located eccentric runner's low reaches and with eccentric runner's internal perisporium links to each other in order to incite somebody to action the fluid direction the outlet pipe.

In some embodiments of the present invention, the diversion portion is in arc transition with a junction of the inner circumferential wall of the eccentric runner, and the diversion portion is in arc transition with the inner circumferential wall of the outlet pipe.

According to some embodiments of the present invention, an inlet pipe is provided on the volute body, the inlet pipe is located at the fluid inlet, and a part of the centrifugal impeller is located in the inlet pipe.

According to the utility model discloses centrifugal pump, include: a volute according to the above embodiments of the present invention; a centrifugal impeller located within the mounting chamber; and a motor shaft of the motor extends into the matching part to be matched and connected with the centrifugal impeller to drive the centrifugal impeller to rotate.

According to the utility model discloses centrifugal pump is through setting up the basis the utility model discloses the spiral case of above-mentioned embodiment to can satisfy fluidic basic flow characteristic and guarantee the fluidic flow efficiency in the spiral case, the total volume of centrifugal pump is less relatively, and occupation space is little, thereby is favorable to the miniaturization of centrifugal pump, is favorable to reducing the quantity of the manufacturing material of centrifugal pump simultaneously, reduces the manufacturing cost of centrifugal pump.

According to the utility model discloses a few embodiments, be equipped with the motor installation department on the spiral case body, the motor installation department with the cooperation of motor buckle.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

figure 1 is a schematic view of a volute according to some embodiments of the present invention;

fig. 2 is a partial schematic view of a centrifugal pump according to some embodiments of the present invention;

fig. 3 is a partial schematic view of a centrifugal pump according to some embodiments of the present invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

figure 5 is a partial cross-sectional view of a volute according to some embodiments of the present invention;

fig. 6 is a schematic diagram of a flow path of fluid within a volute, according to some embodiments of the present disclosure.

Reference numerals:

10. a volute;

1. a volute body;

11. a fluid inlet; 12. an outlet pipe; 13. an inlet pipe; 14. an eccentric volute chamber; 141. an eccentric runner;

15. a fitting portion; 15a, mounting holes; 16. a partition plate; 17. a volute tongue; 18. a flow guide part; 19. installing a chamber;

2. a connecting flange; 3. a motor mounting portion; 31. rotating the buckle;

100. a centrifugal pump;

20. and (4) centrifuging the impeller.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A volute 10 according to an embodiment of the present invention is described below with reference to fig. 1-6. Wherein the volute 10 is applicable in a centrifugal pump 100. The volute 10 may be an eccentric volute.

As shown in fig. 1 to 5, a spiral casing 10 according to an embodiment of the present invention includes: a volute body 1.

Specifically, the volute body 1 is provided with a fluid inlet 11 and an outlet pipe 12, an eccentric volute chamber 14 and a mounting chamber 19 for assembling a centrifugal impeller 20 are defined in the volute body 1, and the fluid inlet 11 is located on the side wall of the mounting chamber 19. The eccentric volute chamber 14 is provided with a fitting part 15 extending towards the fluid inlet 11, the centrifugal impeller 20 is mounted on the fitting part 15 to be connected with the motor, an outer circumferential wall of the fitting part 15 and an inner circumferential wall of the eccentric volute chamber 14 define an eccentric flow passage 141 communicated with the outlet pipe 12, and a cross-sectional area of the fitting part 15 is gradually reduced in a flow direction of the fluid.

Therefore, when the pump body (for example, the centrifugal pump 100) to which the volute 10 of the present invention is applied works, the centrifugal impeller 20 can be driven by a motor (not shown) to rotate, so that the fluid enters the volute body 1 through the fluid inlet 11, then flows to the outlet pipe 12 after passing through the installation chamber 19 where the centrifugal impeller 20 is located and the eccentric flow channel 141 in the eccentric volute chamber 14, and finally flows out of the volute 10, thereby achieving the function of pumping the fluid by the pump body. It should be noted that, in the embodiment of the present invention, the fluid may be liquid or gas, and when the fluid pumped by the pump body is gas, the pump body is suitable for the field of household appliances. It can be understood that although the centrifugal impeller 20 is disposed at the matching portion 15, when the centrifugal impeller 20 is connected with the motor shaft of the motor in a matching manner and is driven by the motor to rotate, the centrifugal impeller 20 should not contact with the matching portion 15, so that the reliability of the rotation of the centrifugal impeller 20 can be ensured, the output power of the motor is reduced, and the stability and reliability of the operation of the pump body are ensured. For example, as shown in fig. 4, a mounting hole 15a is formed in the matching portion 15, a part of the centrifugal impeller 20 extends into the mounting hole 15a, and a motor shaft of the motor extends into the mounting hole 15a to be matched and connected with the off-line impeller 20, so that the reliability of the motor driving the centrifugal impeller 20 to rotate can be ensured.

Meanwhile, in the embodiment of the present invention, since the cross-sectional area of the fitting portion 15 is gradually reduced in the flowing direction of the fluid, and the outer peripheral wall of the fitting portion 15 and the inner peripheral wall of the eccentric volute chamber 14 define the eccentric flow channel 141, it can be understood that the cross-sectional area of the eccentric flow channel 14 is gradually increased in the flowing direction of the fluid, so that the basic flowing characteristic of the fluid can be satisfied, the flowing efficiency of the fluid can be ensured, and the outer peripheral wall of the volute 10 is not outwardly expanded. Compared with the prior art from this, the utility model discloses the volume of spiral case 10 is less relatively, and occupation space is little to be favorable to using the utility model discloses the miniaturization of the spiral case 10's the pump body is favorable to reducing the quantity of the manufacturing material of spiral case 10 simultaneously, reduces spiral case 10's manufacturing cost. It should be noted that, in the embodiment of the present invention, the flowing direction of the fluid specifically refers to the direction from the fluid inlet 11 to the outlet pipe 12 on the central axis of the fluid inlet 11. The mating portion 15 may extend in a direction parallel to or coincident with the central axis of the fluid inlet 11.

According to the utility model discloses spiral case 10, in fluidic flow direction, the cross-sectional area of cooperation portion 15 reduces gradually, thereby make eccentric runner 141's cross-sectional area be crescent on fluidic flow direction, can satisfy fluidic basic flow characteristic from this and guarantee the fluidic flow efficiency in spiral case 10, spiral case 10's total volume is less relatively, occupation space is little, thereby be favorable to using the miniaturization of the pump body of spiral case 10, be favorable to reducing the quantity of the manufacturing material of spiral case 10 simultaneously, reduce spiral case 10's manufacturing cost.

As shown in fig. 4 and 5, according to some embodiments of the present invention, a partition 16 is disposed on an end of the fitting portion 15 close to the fluid inlet 11, an extending direction of the partition 16 is perpendicular to an extending direction of the fitting portion 15 to separate the installation chamber 19 from the eccentric volute chamber 14, and at least a portion of an outer peripheral wall of the partition 16 is spaced apart from an inner peripheral wall of the volute body 1 to define an inlet of the eccentric volute chamber 14. Therefore, the volute body 1 is simple in structure and convenient to manufacture. It will be appreciated that the mounting chamber 19 is located upstream of the eccentric volute 14 in the direction of fluid flow. Meanwhile, the partition 16 is arranged to effectively separate the mounting chamber 19 from the eccentric volute 14, and ensure that the fluid in the mounting chamber 19 can flow into the eccentric volute 14 through the inlet and finally flows from the eccentric volute 14 to the outlet pipe 12. Specifically, as shown in fig. 4, the cross-sectional area of the mounting chamber 19 is kept constant in the flow direction of the fluid. Specifically, the direction of rotation of the centrifugal impeller 20 is the same as the direction of rotation of the eccentric flow path 141 of the eccentric volute 14. For example, when the rotation direction of the centrifugal impeller 20 is counterclockwise, the eccentric flow path 141 of the eccentric volute 14 gradually increases in cross-sectional area in the counterclockwise direction from the initial smaller cross-sectional area. It will be appreciated that the radius of the end of the fitting 15 adjacent the mounting chamber 19 is greatest and the radius of the end adjacent the outlet tube 12 is least.

Specifically, as shown in fig. 4 and 5, the central axis of the fitting portion 15 coincides with the central axis of the fluid inlet 11, the fitting portion 15 is provided with a mounting hole 15a suitable for the fitting connection of the centrifugal impeller 20 and the motor, the mounting hole 15a penetrates the fitting portion 15 along the extending direction of the central axis, and the partition plate 16 is provided with a through hole opposite to and communicating with the mounting hole 15 a. Therefore, the structural distribution of the volute 10 is more reasonable, and the structural strength of the volute 10 is improved. Meanwhile, the arrangement of the mounting hole 15a and the communication hole can ensure the reliability of the matching connection of the centrifugal impeller 20 and the motor.

As shown in fig. 4, in some embodiments of the present invention, the orthographic projection of the centrifugal impeller 20 is located within the orthographic projection of the partition 16 on the same projection plane perpendicular to the extending direction of the fitting portion 15. It can thus be seen that the diameter of the outlet of the centrifugal impeller 20 is smaller than the diameter of the baffle 16. The portion of the partition 16 facing the centrifugal impeller 20 in the extending direction perpendicular to the fitting portion 15 may serve to partition the centrifugal impeller 20 from the eccentric flow passage 141. And a portion of the outer peripheral wall of the partition 16 located outside the outer peripheral wall of the centrifugal impeller 20 may function as a vaneless diffuser. Whereby the reliability of the flow of the fluid in the scroll case 10 can be improved.

As shown in fig. 5 and 6, in some embodiments of the present invention, the volute body 1 is provided with a volute tongue 17, and the volute tongue 17 is located in the mounting chamber 19 and extends to the partition 16 along the central axis of the fluid inlet 11. It can be seen that the provision of the volute tongue 17 does not affect the flow of the fluid in the eccentric flow passage 141, and the reliability of the flow of the fluid in the volute casing 10, and thus the reliability of the volute casing 10, is improved. Alternatively, the volute tongue 17 is a straight volute tongue 17, the cross-sectional area of the volute tongue 17 remaining constant in the direction of extension of the mating portion 15.

As shown in fig. 6, in some embodiments of the present invention, the junction of the volute tongue 17 and the inner circumferential wall of the mounting chamber 19 is in a circular arc transition. Therefore, when the fluid flows in the mounting chamber 19, the fluid is not blocked by the arrangement of the volute tongue 17, and the reliability of the fluid flowing in the mounting chamber 19 is improved.

As shown in fig. 5, according to some embodiments of the present invention, the volute body 1 is provided with a flow guiding portion 18, and in the flowing direction of the fluid, the flow guiding portion 18 is located at the downstream of the eccentric flow passage 141 and connected to the inner peripheral wall of the eccentric flow passage 141 to guide the fluid to the outlet pipe 12. Therefore, the guide portion 18 is disposed to facilitate the fluid in the eccentric flow path 141 to flow toward the outlet pipe 12 and further flow out of the volute 10, thereby improving the reliability of the fluid flowing in the volute 10 and the reliability of the volute 10.

As shown in fig. 5, in some embodiments of the present invention, the connection between the diversion portion 18 and the inner circumferential wall of the eccentric flow passage 141 is in a circular arc transition. Therefore, the blocking of the fluid at the connection between the diversion part 18 and the eccentric flow passage 141 can be effectively avoided, the reliability of the fluid flowing in the volute 10 is improved, and the reliability of the volute 10 is improved.

As shown in fig. 5 and 6, in some embodiments of the present invention, the flow guide portion 18 is connected to the inner peripheral wall of the outlet pipe 12 and the connection point is in a circular arc transition. Therefore, the connection part of the flow guide part 18 and the outlet pipe 12 can be effectively prevented from blocking the flow of the fluid, the reliability of the flow of the fluid in the volute 10 is improved, and the reliability of the volute 10 is improved.

As shown in fig. 1 and 3, according to some embodiments of the present invention, an inlet pipe 13 is provided on the volute body 1, the inlet pipe 13 is located at the fluid inlet 11, and a part of the centrifugal impeller 20 is located in the inlet pipe 13. It will be appreciated that fluid can be introduced into the fluid inlet 11 through the inlet tube 13 and ultimately into the volute 10. The location of the centrifugal impeller 20 is configured to facilitate an increased ability of the volute 10 to draw fluid, thereby increasing the operating efficiency of the volute 10.

As shown in fig. 1-3, according to some embodiments of the present invention, a connecting flange 2 is disposed on the peripheral wall of the volute body 1, and the connecting flange 2 is located at the fluid inlet 11. Therefore, the volute body 1 is conveniently matched and connected with the flow guide part 18, the reliability of the volute 10 is improved, and the pump body is conveniently assembled and connected in practical application.

The structure of the scroll casing 10 according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 6. It should be noted that the following description is only exemplary, and it is obvious that a person skilled in the art may combine, replace, modify and/or modify the technical solutions or some technical features of the present invention after reading the following technical solutions of the present invention, which also falls into the protection scope of the present invention.

According to the utility model discloses spiral case 10, include: a volute body 1. The volute body 1 is provided with a fluid inlet 11 and an outlet pipe 12, the volute body 1 is provided with an inlet pipe 13, the inlet pipe 13 is positioned at the fluid inlet 11, and a part of the centrifugal impeller 20 is positioned in the inlet pipe 13. The volute body 1 defines therein an eccentric volute chamber 14 and a mounting chamber 19 for mounting a centrifugal impeller 20, which are communicated with each other, and the fluid inlet 11 is located on a side wall of the mounting chamber 19. The eccentric volute chamber 14 is internally provided with a matching part 15 extending towards the fluid inlet 11, and the central axis of the matching part 15 is coincident with the central axis of the fluid inlet 11. The centrifugal impeller 20 is installed to the fitting part 15 to be connected to the motor, an outer circumferential wall of the fitting part 15 and an inner circumferential wall of the eccentric volute 14 define an eccentric flow passage 141 communicating with the outlet pipe 12, and a cross-sectional area of the fitting part 15 is gradually reduced in a flow direction of the fluid.

The end of the fitting 15 adjacent the fluid inlet 11 is provided with a partition 16, the partition 16 extends radially of the fitting 15 to separate the mounting chamber 19 from the eccentric volute chamber 14, and at least a portion of the outer peripheral wall of the partition 16 is spaced from the inner peripheral wall of the volute body 1 to define the inlet of the eccentric volute chamber 14. On the same projection plane perpendicular to the axial direction of the fitting portion 15, the orthogonal projection of the centrifugal impeller 20 is located within the orthogonal projection of the partition 16.

The volute body 1 is provided with a volute tongue 17, and the volute tongue 17 is positioned in the mounting chamber 19 and extends to the partition plate 16 along the central axis of the fluid inlet 11. The junction of the volute tongue 17 and the inner peripheral wall of the mounting chamber 19 is in circular arc transition. The volute body 1 is provided with a flow guiding portion 18, and the flow guiding portion 18 is located downstream of the eccentric flow channel 141 in the flow direction of the fluid and connected with the inner circumferential wall of the eccentric flow channel 141 to guide the fluid to the outlet pipe 12. The connection between the flow guide part 18 and the inner circumferential wall of the eccentric flow passage 141 is in a circular arc transition. The flow guide part 18 is connected with the inner peripheral wall of the outlet pipe 12 and the connection part is in circular arc transition. The peripheral wall of the volute body 1 is provided with a connecting flange 2, and the connecting flange 2 is positioned at the fluid inlet 11.

Specifically, as shown in fig. 5 and 6, the overall fluid flow path structure in the scroll casing 10, wherein P1 to P2 indicate the outer contour line of the eccentric flow path 141, and K1 to K2 indicate the inner contour line of the eccentric flow path 141. Wherein P1 and K1 are the start positions of the eccentric runner 141, and P2 and K2 are the end positions of the eccentric runner 141. It can be seen that the cross-sectional area of the eccentric flow path 141 is gradually increased in the flow direction of the fluid.

The outer profile of the flow guide 18 denoted by P2 to P3 and the inner profile of the flow guide 18 denoted by K2 to K3. Wherein, P2 and K2 are the junction of the flow guide part 18 and the inner peripheral wall of the eccentric volute 14, and the flow guide part 18 is tangent to the contour line of the eccentric volute 14, thereby forming a circular arc transition. It can also be seen that the cross-sectional area of the flow path of the fluid defined at the flow guide 18 remains constant.

P3-P4 show the variable cross-section path of the inner peripheral wall of the outlet pipe 12, and K3-K4 show the guide lines on the inner peripheral wall of the outlet pipe 12, wherein the variable cross-section path is tangent to the outline of the flow passage defined by the flow guide 18 at the point P3, and the guide lines are tangent to the inner outline of the flow passage defined by the flow guide 18 at the point K3, so that the connection between the inner peripheral wall of the outlet pipe 12 and the flow guide 18 is in circular arc transition.

O1 to O1 ' indicate the shapes of the flow channel inlet sections, and O1 is equal to O1 ' in coordinate in the axial direction, i.e., O1 to O1 ' are formed as circular sections. Q1 to Q3 indicate outer contour lines of the flow passage defined by the mounting chamber 19, wherein Q1, Q2 and Q3 are coordinate-equal in the axial direction, i.e., Q1 to Q3 are formed as circular sections. The arc line of the volute tongue 17 is tangent to the outline profile of the flow passage defined by the mounting chamber 19 indicated by Q1-Q3, so that arc transition of the connecting part of the volute tongue 17 and the inner peripheral wall of the mounting chamber 19 is ensured.

In summary, the whole flow path of the fluid defined in the volute 10 is in smooth transition, so that the fluid can flow conveniently, the fluid cannot be blocked at each connection position, and the like, and further, the volume of the volute 10 is reduced, the basic flow characteristic of the fluid and the flow efficiency of the fluid in the volute 10 can be ensured, and the reliability of the volute 10 is improved.

As shown in fig. 1 to 4, a centrifugal pump 100 according to an embodiment of the present invention includes: a volute 10, a centrifugal impeller 20 and a motor. The centrifugal pump 100 may be used in a dishwasher. Wherein the volute 10 is a volute 10 according to the above embodiments of the present invention, and the centrifugal impeller 20 is located in the installation chamber 19. The motor shaft of the motor extends into the matching part 15 to be matched and connected with the centrifugal impeller 20 so as to drive the centrifugal impeller 20 to rotate.

According to the utility model discloses centrifugal pump 100 is through setting up the basis the utility model discloses the spiral case 10 of above-mentioned embodiment to can satisfy fluidic basic flow characteristic and guarantee the fluidic flow efficiency in spiral case 10, centrifugal pump 100's total volume is less relatively, and occupation space is little, thereby is favorable to centrifugal pump 100's miniaturization, is favorable to reducing the quantity of centrifugal pump 100's manufacturing material simultaneously, reduces centrifugal pump 100's manufacturing cost.

As shown in fig. 3 and 4, according to some embodiments of the present invention, the spiral casing body 1 is provided with a motor mounting portion 3, and the motor mounting portion 3 is in snap fit with the motor. Therefore, the matching connection mode of the volute 10 and the motor is simple and convenient to disassemble and assemble. Specifically, the motor mounting portion 3 is located on a side of the eccentric volute chamber 14 remote from the fluid inlet 11. Specifically, the motor mounting portion 3 and the volute body 1 are integrally formed.

As shown in fig. 1 to 4, in some embodiments of the present invention, a rotating buckle 31 is circumferentially disposed on the motor mounting portion 3 to be connected with the motor in a matching manner. Therefore, the motor mounting part 3 is connected with the motor through the rotating buckle 31, the matching mode is simple and reliable, and meanwhile, the motor mounting part is convenient to disassemble and assemble. Meanwhile, it can be understood that the number of the rotating buckles 31 is multiple, so that the reliability of the matching connection of the motor mounting part 3 and the motor can be ensured, and the reliability of the centrifugal pump 100 can be further improved.

Other constructions and operations of the centrifugal pump 100 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A spiral casing, comprising:

the volute comprises a volute body, wherein a fluid inlet and an outlet pipe are arranged on the volute body, an eccentric volute chamber and an installation chamber for assembling a centrifugal impeller, which are communicated with each other, are defined in the volute body, and the fluid inlet is positioned on the side wall of the installation chamber;

the eccentric volute chamber is internally provided with a matching part extending towards the fluid inlet, the centrifugal impeller is mounted on the matching part to be connected with the motor, the outer peripheral wall of the matching part and the inner peripheral wall of the eccentric volute chamber define an eccentric flow channel communicated with the outlet pipe, and the cross-sectional area of the matching part is gradually reduced in the flowing direction of the fluid.

2. The spiral casing of claim 1 wherein a partition is provided on an end of the engagement portion proximate the fluid inlet, the partition extending in a direction perpendicular to the engagement portion to separate the mounting chamber from the eccentric volute, at least a portion of an outer peripheral wall of the partition being spaced from an inner peripheral wall of the spiral casing body to define the inlet of the eccentric volute.

3. The spiral casing of claim 2 wherein an orthographic projection of the centrifugal impeller is located within an orthographic projection of the partition on a same plane of projection perpendicular to a direction of extension of the mating portion.

4. The volute of claim 2, wherein the volute body has a volute tongue disposed within the mounting chamber and extending along the central axis of the fluid inlet to the partition.

5. The volute of claim 4, wherein the junction of the volute tongue and the inner peripheral wall of the mounting chamber is radiused.

6. The spiral casing of claim 1 wherein the spiral casing body is provided with a flow guide portion which is located downstream of the eccentric flow path in a flow direction of the fluid and is connected to an inner circumferential wall of the eccentric flow path to guide the fluid to the outlet pipe.

7. The spiral casing of claim 6 wherein the flow guide is radiused to the junction of the inner peripheral wall of the eccentric flow passage and the flow guide is radiused to the junction of the inner peripheral wall of the outlet pipe.

8. The spiral casing of any of claims 1 to 7 wherein an inlet pipe is provided on the spiral casing body, the inlet pipe being located at the fluid inlet, a portion of the centrifugal impeller being located within the inlet pipe.

9. A centrifugal pump, comprising:

a volute according to any of claims 1-8;

a centrifugal impeller located within the mounting chamber;

and a motor shaft of the motor extends into the matching part to be matched and connected with the centrifugal impeller to drive the centrifugal impeller to rotate.

10. The centrifugal pump of claim 9, wherein a motor mount is provided on the volute body, the motor mount snap-fitting with the motor.