Shield pump

Abstract

The utility model discloses a shield pump. The shield pump comprises a machine base, a pump body and an impeller. The pump body and the machine base are in sealed connection to form a cavity, and the pump body is provided with a first inlet and a first outlet communicating with the cavity. The impeller comprises a first cover plate, blades and a second cover plate which are sequentially arranged in the axial direction, a branch flow channel is formed between the first cover plate and the inner wall face of the pump body, any one of the outer surface of the first cover plate and the inner wall face of the pump body is provided with a protruding part protruding in the axial direction, and the other one of the outer surface of the first cover plate and the inner wall face of the pump body is provided with a groove part sunken in the axial direction. And the convex part is embedded in the groove part so as to enlarge the flowing path of the fluid in the sub-runner. The convex parts and the groove parts are arranged in the sub-runners, so that the flowing paths and the flowing difficulty of liquid are increased, and the flow of the liquid discharged from the sub-runners is reduced, so that the volume loss is reduced, and the volume efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a shield pump technical field, concretely relates to a shield pump. BACKGROUND

[0002] The shield pump utilizes motor base and pump body integration design, rotor and pump shaft are connected, and are completely closed by shield sleeve, motor drives rotor rotation, through the centrifugal force of impeller, liquid is sucked from pump inlet and is discharged after pressurization, in this process, since pump body and base are all filled with liquid, and need liquid lubrication, therefore, the liquid sucked from the pump inlet will not be completely pressurized by the impeller and discharged from the outlet, part of the liquid will flow into the base end and each gap to circulate and cause volume loss, in this process, how to let the liquid as much as possible from the inlet after suction flow through the impeller and be pressurized and discharged to improve the volumetric efficiency becomes a problem to be solved. SUMMARY

[0003] The utility model discloses at least one of the technical problems existing in the prior art is solved, for this, the utility model provides a shield pump, can effectively improve the volumetric efficiency.

[0004] According to the shield pump of the utility model embodiment, including base, pump body and impeller, the pump body is sealed with the base and is connected to form a cavity, the pump body is opened with the first import and the first export that communicate the cavity, the impeller is arranged in the pump body, the impeller is coaxial with the first import, the first export is along the radial of the impeller and is arranged, the impeller is used to rotate to make liquid enter from the first import and discharge from the first export, the impeller includes the first cover plate, the blade and the second cover plate that are sequentially arranged along the axial direction, the first cover plate and the inner wall surface of the pump body form the shunt channel, the outer surface of the first cover plate and the inner wall surface of the pump body any one is provided with the protruding portion that protrudes along the axial direction, and the other is provided with the recessed groove portion that recesses along the axial direction, the protruding portion is embedded in the recessed groove portion to increase the flow path of fluid in the shunt channel.

[0005] According to the shield pump of the utility model embodiment, at least has the following beneficial effects: since the impeller needs to rotate in the pump body to drive liquid to enter, pressurize and discharge, therefore, there will be a gap between the impeller and the inner wall surface of the pump body, so that after the liquid enters from the first import, part of the liquid will flow along the radial from the gap between the inner wall surface of the pump body and the impeller, that is, the shunt channel, and will not completely enter the impeller and be pressurized by the blade to be discharged, thereby causing volume loss. The shield pump of the utility model embodiment increases the flow path and flow difficulty of the liquid by setting the protruding portion and the recessed groove portion in the shunt channel, reduces the flow of the liquid discharged from the shunt channel, thereby reducing the volume loss and improving the volumetric efficiency.

[0006] According to some embodiments of the present application, the protruding part is arranged on the outer surface of the first cover plate, and the groove part is arranged on the inner wall surface of the pump body.

[0007] According to some embodiments of the present application, the protruding part and the groove part are both annular in shape and coaxial with the impeller when viewed along the axial direction of the impeller.

[0008] According to some embodiments of the present application, the protruding part and the groove part are both arranged in at least two groups, and the multiple groups of the protruding part and the groove part are arranged in a radial direction.

[0009] According to some embodiments of the present application, the inner wall surface of the pump body comprises a first curved surface, the outer surface of the first cover plate comprises a second curved surface, the protruding part is arranged on any one of the first curved surface and the second curved surface, the groove part is arranged on the other one, and the first curved surface and the second curved surface gradually move away from the first inlet from the central axis of the impeller to the edge of the impeller.

[0010] According to some embodiments of the present application, the first cover plate further comprises a third curved surface, the second cover plate comprises a fourth curved surface, the third curved surface and the fourth curved surface are arranged oppositely, the third curved surface and the fourth curved surface gradually move away from the first inlet from the central axis of the impeller to the edge of the impeller, and the distance between the first cover plate and the second cover plate gradually decreases.

[0011] According to some embodiments of the present application, a stepped surface is further arranged in the pump body, the stepped surface and the first cover plate form part of the shunt channel, the stepped surface is connected to the first inlet and extends in a radial direction to increase the flow path of fluid between the first cover plate and the pump body.

[0012] According to some embodiments of the present application, the canned motor pump further comprises a rotating shaft, the impeller is sleeved on one end of the rotating shaft close to the first inlet, and the rotating shaft is a hollow structure with both ends through.

[0013] According to some embodiments of the present application, the rotating shaft comprises a first segment and a second segment connected to each other, the diameter of the first segment is smaller than the diameter of the second segment, and the first segment is closer to the first inlet than the second segment.

[0014] According to some embodiments of the present application, the impeller is provided with a plurality of discharge ports in a circumferential direction, and the plurality of discharge ports are connected to the inner circumferential surface of the rotating shaft.

[0015] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a cross-sectional view of a shielded pump according to one embodiment of the present invention;

[0018] Figure 2 for Figure 1 Enlarged view of region A in the middle;

[0019] Figure 3 This is a cross-sectional view of the impeller of a canned pump in one embodiment of the present invention;

[0020] Figure 4 This is a top view of the impeller in one embodiment of the present invention;

[0021] Figure 5 This is a perspective view of the pump body of a shielded pump according to one embodiment of the present invention.

[0022] Reference numerals: Shielded pump 100, base 101, pump body 102, impeller 103, first inlet 104, rotating shaft 105, first section 106, second section 107, diversion channel 201, protrusion 202, groove 203, stepped surface 204, first cover plate 205, blade 206, second cover plate 207, first curved surface 208, second curved surface 209, third curved surface 210, fourth curved surface 211, discharge port 301, second inlet 302, second outlet 303, first outlet 501. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceed and the like are understood as not including the number, above, below, within and the like are understood as including the number. If it is described to first, second, it is only used for distinguishing the purpose of technical features, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0026] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood broadly, and the specific meaning of the above words in the utility model can be reasonably determined by the person skilled in the art in the technical field in combination with the specific content of the technical scheme.

[0027] In the description of the utility model, the description of reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0028] Reference Figure 1 , Figure 2 and Figure 5According to the shielding pump 100, the protruding part 202 and the recessed part 203 are arranged in the shunt channel 201, the flow path of the liquid is increased, the flow difficulty of the liquid is increased, the flow of the liquid discharged from the shunt channel 201 is reduced, the volume loss is reduced, and the volume efficiency is improved.

[0029] It should be noted that the first outlet 501 is not shown in Figure 1 , and the actual position can be referred to Figure 5 , which is located on the side surface of the shielding pump 100. Moreover, referring to Figure 3 , the impeller 103 is provided with the second inlet 302 and the second outlet 303, and the main path of the liquid flow is as follows: the rotation of the impeller 103 generates low pressure, so that the liquid enters from the first inlet 104 and flows into the inside of the impeller 103 from the second inlet 302 of the impeller 103; under the rotation of the blade 206, the liquid generates rotation and centrifugal force between the first cover plate 205 and the second cover plate 207, flows out from the gap between the first cover plate 205 and the second cover plate 207, that is, the second outlet 303, and is discharged from the shielding pump 100 through the first outlet 501 shown in Figure 5 . The volume loss easily generated in this process is that Figure 2The flow channel 201 shown, the liquid in the flow channel 201 does not flow through the blade 206 and is not pressurized and discharged by the impeller 103, so increasing the path of the flow channel 201 increases the flow difficulty, which can reduce the flow, thereby reducing the volume loss and improving the volume efficiency.

[0030] It should be noted that in some embodiments of the utility model, the design of the protruding part 202 and the groove part 203 can not be limited to Figure 2 The form shown, the cross-sectional shape can also be designed as a taper, trapezoidal, etc., and the arrangement position can also be adjusted, for example, arranged in the axial direction, and the protruding part 202 extends in the radial direction, for example, parallel to Figure 2 The core point is to set a labyrinth structure in the flow channel 201 to increase the path and difficulty of liquid flow.

[0031] Reference Figure 2 In some embodiments of the utility model, the protruding part 202 is arranged on the outer surface of the first cover plate 205, and the groove part 203 is arranged on the inner wall surface of the pump body 102. The protruding part 202 is fixedly arranged on the outer circumferential end surface of the first cover plate 205 of the impeller 103, and the groove part 203 is correspondingly arranged on the inner wall surface of the pump body 102. The structure design realizes technical optimization through differential machining process, the impeller 103 is relatively easy to manufacture the protruding part 202, it is relatively more troublesome to manufacture the protruding part 202 in the inner wall of the pump body 102, relatively, it is relatively easy to open the groove part 203, and the first cover plate 205 of the impeller 103 is relatively thin, and needs to rotate at high speed in the use process, opening the groove part 203 on the first cover plate 205 will also affect the structural strength. But in some embodiments of the utility model, according to the actual structure and thickness size of the shielding pump 100, the protruding part 202 can be arranged on the pump body 102, the groove part 203 is opened on the impeller 103, and the gap fit between the two can also increase the liquid flow difficulty and path length of the flow channel 201.

[0032] Reference Figure 4 In some embodiments of the utility model, the protruding part 202 and the groove part 203 are both circular annular along the axial direction of the impeller 103, and are coaxial with the impeller 103. It should be noted that Figure 4 The shape of the protruding part 202 is shown in the above Figure 2 It can be known that the groove part 203 is also annular. The annular arrangement can make the labyrinth design not affect the rotation of the impeller 103, so that it can effectively hinder the volume loss caused by the liquid flowing along the flow channel 201 when the impeller 103 rotates.

[0033] Reference Figures 2 to 4In some embodiments of the present application, the protruding portion 202 and the groove portion 203 are provided with at least two groups, and the multiple groups of protruding portions 202 and groove portions 203 are arranged along the radial direction. The design of multiple groups can further complicate the path of the flow channel 201 and increase the difficulty of liquid flow, thereby further reducing the volume loss. Specifically, three groups or more than three groups can be provided, and the actual production requirements and the requirements for volumetric efficiency are adjusted, and the positions of the protruding portion 202 and the groove portion 203 can also be adjusted, preferably as shown in Figure 2 and Figure 4 The protruding portion 202 and the groove portion 203 are arranged at a relatively middle position.

[0034] It should be noted that, with reference to Figure 2 In some embodiments of the present application, the height of each protruding portion 202 protruding relative to the first curved surface 208 is consistent, which can make the depth of the corresponding groove portion 203 consistent, thereby avoiding affecting the structural strength of the pump body 102 due to excessive slotting. In some embodiments, if the thickness of the pump body 102 is sufficient, the slotting will not excessively affect the structural strength, and since the trend of the curved surface is gradually downward, in order to further improve the labyrinth obstruction effect, the height of the peripheral protruding portion 202 can be made higher, and the depth of the groove portion 203 can be adjusted accordingly.

[0035] With reference to Figure 1 and Figure 2 In some embodiments of the present application, the inner wall surface of the pump body 102 includes a first curved surface 208, the outer surface of the first cover plate 205 includes a second curved surface 209, the protruding portion 202 is arranged on any one of the first curved surface 208 and the second curved surface 209, and the groove portion 203 is arranged on the other one. From the central axis of the impeller 103 to the edge of the impeller 103, the first curved surface 208 and the second curved surface 209 gradually move away from the first inlet 104. The curved surface design optimizes the fluid dynamics performance, significantly reduces the flow resistance, and guides the fluid to flow from the middle to the outer edge. The structure of the central protrusion and the gradually descending edge can effectively utilize the coupling effect of gravitational potential energy and surface curvature, so that the liquid forms a laminar flow dominated flow pattern when spreading from the central area to the peripheral edge, thereby avoiding turbulent separation and minimizing energy dissipation, so that the liquid can flow smoothly from the first inlet 104 and the second inlet 302 into the impeller 103 and be driven by the blade 206 to be pressurized and discharged.

[0036] With reference to Figure 1 and Figure 2In some embodiments of the utility model, first cover plate 205 still includes third curved surface 210, second cover plate 207 includes fourth curved surface 211, third curved surface 210 and fourth curved surface 211 are oppositely arranged, from the central axis of impeller 103 to the edge of impeller 103, third curved surface 210 and fourth curved surface 211 gradually move away from first inlet 104, the distance between first cover plate 205 and second cover plate 207 gradually reduces. Based on the same principle, after liquid enters impeller 103, it also needs to be well pressurized and discharged, so curved surface design is also made, and the structure of central convex and edge gradually descending is adopted, the coupling effect of gravitational potential energy and surface curvature can be effectively utilized, so that the flow pattern dominated by laminar flow is formed when liquid spreads from the central region to the periphery, thereby avoiding turbulent separation and minimizing energy dissipation. The distance between first cover plate 205 and second cover plate 207 is designed to gradually decrease from the middle region to the outer peripheral region, so that the fluid can also be pressurized in the vertical direction, reducing the volume of the flow channel and improving the pressurization effect.

[0037] Reference Figure 1 And Figure 2 In some embodiments of the utility model, the pump body 102 is also provided with a stepped surface 204, and the stepped surface 204 and the first cover plate 205 form a part of the flow channel 201, and the stepped surface 204 is communicated with the first inlet 104 and extends radially to increase the flow path of the fluid between the first cover plate 205 and the pump body 102. Figure 2 As shown in the figure, the gap between the stepped surface 204 and the first cover plate 205 in the vertical direction also forms part of the flow channel 201, and because the stepped surface 204 is axially perpendicular to the first inlet 104, the liquid flowing into the flow channel 201 needs to make a corner, so that the probability of volume loss of the liquid flowing into the flow channel 201 can be further reduced, thereby improving the volumetric efficiency of the canned motor pump 100. In some embodiments of the utility model, the stepped surface 204 can be provided with multiple angles, for example, inclined to the first outlet 501 instead of perpendicular, which can be adjusted according to actual needs, and multiple convex portions 202 and recessed portions 203 can also be arranged in the flow channel 201 path from the stepped surface 204 to the convex portion 202 to realize more complex labyrinth design.

[0038] Reference Figure 1In some embodiments of the utility model, shielding pump 100 still include rotating shaft 105, impeller 103 is set to rotating shaft 105 one end close to first import 104, rotating shaft 105 is the hollow structure of both ends through. Hollow shaft can be used as the flow channel of liquid, thereby realizing the flow and circulation of liquid in shielding pump 100, specifically, liquid enters shielding pump 100 from first import 104, except the liquid of discharge, the rest will flow in cavity and fill shielding pump 100, when liquid flows into the lower end of shielding pump 100, because of the rotation of impeller 103 produces pressure difference, therefore can suck liquid from the lower end of rotating shaft 105 and discharge from the upper end connected with impeller 103, realize the circulation of liquid in shielding pump 100, and hollow structure can also improve the heat dissipation effect.

[0039] Reference Figure 1 In some embodiments of the utility model, rotating shaft 105 includes mutually connected first segment 106 and second segment 107, the diameter of first segment 106 is less than the diameter of second segment 107, and first segment 106 is closer to first import 104 than second segment 107. The flow of liquid in rotating shaft 105 is from bottom to top. By setting the first segment 106 close to the first import 104 to have a smaller diameter, the liquid flowing out can be pressurized by the smaller flow passage volume, thereby better discharging and improving the circulation efficiency of the liquid.

[0040] Reference Figure 3 And Figure 4 In some embodiments of the utility model, impeller 103 is provided with a plurality of discharge ports 301 along the circumference, and the plurality of discharge ports 301 communicate with the inner circumferential surface of rotating shaft 105. The discharge port 301 can make the liquid flow into the impeller 103 from the rotating shaft 105 more uniform and dispersed, and the concentrated fluid collides with the liquid entering from the first import 104 to generate turbulent flow phenomenon, improving the stability of liquid flow. Further, reference Figure 3 In some embodiments of the utility model, from bottom to top, the path of the discharge port 301 gradually moves away from the central axis of the rotating shaft 105, so that the liquid can be discharged more divergent and avoid conflict with the liquid flowing from the first import 104, and can flow to the second outlet 303 and be discharged together. Further, reference Figure 4 In some embodiments of the utility model, the outlet shape of the discharge port 301 is set to a circular arc shape, so that the impact of the liquid discharge can also be alleviated, reducing the turbulent flow phenomenon.

[0041] The utility model embodiment has been explained in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiment, still can make various changes in the knowledge range of the ordinary skill in the art who possesses under the premise of not departing from the utility model's tenet. Besides, the embodiment and the feature in the embodiment of the utility model can be combined mutually under the condition of not conflicting.

Claims

1. A canned pump characterized by, The application relates to a canned motor pump, comprising: a base; a pump body in sealed connection with the base to form a cavity, the pump body being provided with a first inlet and a first outlet communicating with the cavity; a impeller arranged in the pump body, the impeller being coaxial with the first inlet, the first outlet being arranged along a radial direction of the impeller, the impeller being used for rotating to make liquid enter from the first inlet and discharge from the first outlet, the impeller comprising a first cover plate, blades and a second cover plate arranged in sequence along an axial direction, a shunt channel being formed between the first cover plate and an inner wall surface of the pump body, an outer surface of the first cover plate and any one of the inner wall surface of the pump body being provided with a protrusion protruding along the axial direction, the other being provided with a groove recessed along the axial direction, the protrusion being embedded in the groove to increase a flow path of fluid in the shunt channel.

2. The canned pump of claim 1, wherein The protrusion is arranged on the outer surface of the first cover plate, and the groove is arranged on the inner wall surface of the pump body.

3. The canned pump of claim 1, wherein The protrusion and the groove are both circular annular in view along the axial direction of the impeller and coaxial with the impeller.

4. The canned pump of claim 3, wherein The protrusion and the groove are both provided with at least two groups, and multiple groups of the protrusion and the groove are arranged along the radial direction.

5. The canned pump of claim 1, wherein The inner wall surface of the pump body comprises a first curved surface, the outer surface of the first cover plate comprises a second curved surface, the protrusion is arranged on any one of the first curved surface and the second curved surface, the groove is arranged on the other, from a central axis of the impeller to an edge of the impeller, the first curved surface and the second curved surface gradually move away from the first inlet.

6. The canned pump of claim 1, wherein The first cover plate further comprises a third curved surface, the second cover plate comprises a fourth curved surface, the third curved surface and the fourth curved surface are oppositely arranged, from the central axis of the impeller to the edge of the impeller, the third curved surface and the fourth curved surface gradually move away from the first inlet, and the distance between the first cover plate and the second cover plate gradually decreases.

7. The canned pump of claim 1, wherein The pump body is further provided with a stepped surface, part of the shunt channel being formed between the stepped surface and the first cover plate, the stepped surface communicating with the first inlet and extending along the radial direction to increase the flow path of fluid between the first cover plate and the pump body.

8. The canned pump of claim 1, wherein The canned motor pump further comprises a rotating shaft, the impeller being sleeved on one end of the rotating shaft close to the first inlet, the rotating shaft being a hollow structure with both ends penetrating through.

9. The canned pump of claim 8, wherein, The rotating shaft comprises a first segment and a second segment connected with each other, the diameter of the first segment being smaller than that of the second segment, and the first segment being closer to the first inlet than the second segment.

10. The canned pump of claim 8, wherein The impeller is provided with multiple discharge outlets along a circumferential direction, and the multiple discharge outlets communicate with an inner circumferential surface of the rotating shaft.

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