CN211397934U - Shielding circulating pump with improved centering structure - Google Patents
Shielding circulating pump with improved centering structure Download PDFInfo
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- CN211397934U CN211397934U CN201922369593.XU CN201922369593U CN211397934U CN 211397934 U CN211397934 U CN 211397934U CN 201922369593 U CN201922369593 U CN 201922369593U CN 211397934 U CN211397934 U CN 211397934U
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Abstract
The utility model relates to an improve shielding circulating pump of centering structure, the centering effect that solves prior art existence is not good, the machining precision subalternation problem, the technical scheme of adoption: still set up an elastic compression ring on the pump body, elastic compression ring with centering structure cooperation is used for the restriction centering structure is followed deviate from in the installation cavity, centering structure's lateral wall with installation cavity clearance fit. The method has the following effects: the centering structure is loosely matched with the pump body, a certain self-aligning function is achieved on the rotor shaft, and risks such as friction, blocking and the like between the impeller opening ring and the corresponding sealing structure or the centering structure are reduced.
Description
Technical Field
The utility model relates to an improve the shielding circulating pump of centering structure, especially relate to an improve the shielding circulating pump that is used for assembling the centering structure of rotor shaft on the pump body.
Background
At present, to the shielding circulating pump that sets up the rotor shaft, generally all adopt the centering location at axle both ends to the location of rotor shaft, two centering locations are respectively: one end of the rotor shaft is inserted into a first shaft hole arranged in the shielding sleeve, and the other end of the rotor shaft is inserted into a second shaft hole on the pump body (the pump body is integrally manufactured to form the second shaft hole). However, due to the limitations of the complex flow channel structure and the structural form of the pump body, it is not easy to form the second shaft hole and the pump body integrally, and particularly, the position where the second shaft hole is arranged should not only ensure the smooth and unblocked flow channel to reduce the influence on the hydraulic efficiency, but also have sufficient structural precision and manufacturing precision to ensure the assembly requirement of the rotor shaft, and also should not corrode or oxidize in water to ensure the service life of the pump body.
In order to meet the requirements on the pump body, special engineering plastics with high strength and high dimensional stability are undoubtedly the best choice, but the whole pump body is made of the special engineering plastics, so that the cost is undoubtedly very wasted. In practical production applications, in some cases, the pump body is cast by using a metal material to obtain higher pressure resistance and reliability, but the second shaft hole directly machined on the pump body is difficult to produce, so that a centering structure needs to be additionally arranged on the pump body, and the second shaft hole is formed on the centering structure.
But because the machining tolerance of the metal pump body and centering structure itself and the assembly tolerance between the two for the preferred loose assembly of metal pump body and centering structure, again because can have centering structure to follow impeller pivoted risk under the loose fitting state, so need restrict the rotation to centering structure, set up the bump on centering structure usually, set up the draw-in groove in the installation cavity of the pump body, bump and draw-in groove form the joint, adopt this kind of mode to make the centering structure shrink of plastics material uneven again, the pump body interrupted cutting of metal material, these reasons have strengthened the tolerance again, the oral ring is uneven, the pump card is dead.
Disclosure of Invention
The purpose of the utility model is to solve the above problems in the prior art and provide a shielding circulating pump with improved centering structure, which is provided with a limit bump with smaller size on the centering structure, thus reducing the structural asymmetry degree and ensuring the dimensional accuracy of the centering structure, wherein the centering structure is loosely fitted in a mounting cavity formed on a pump body and by finish machining; through the elastic pressure ring pressed into the pump body, the centering structure is limited to be separated from the mounting cavity, and the limiting salient points form rotation limitation, so that the centering structure is limited to rotate within a certain angle range, the rotor shaft can be automatically centered and adjusted, the pump can be prevented from being blocked, and the centering structure can be prevented from continuously rotating along with the impeller.
The terms "up" and "down" as used herein are relative terms and are defined relative to the orientation shown in fig. 1 or 5, i.e., "up" toward the header and "down" toward the footer.
The above technical purpose of the present invention is mainly solved by the following technical solutions: the shielding circulating pump with the improved centering structure comprises a motor, a pump body connected with the motor and an impeller arranged in the pump body; the motor is internally provided with a rotor shaft, a rotor assembly sleeved on the rotor shaft, a stator assembly arranged on the periphery of the rotor assembly and a shielding sleeve for isolating the rotor assembly and the stator assembly, wherein the shielding sleeve is provided with a first shaft hole for assembling one end of the rotor shaft, the pump body is provided with an installation cavity, the installation cavity is internally provided with a pair of centering structures, the centering structures are provided with second shaft holes for assembling the other end of the rotor shaft, and an impeller is arranged on the rotor shaft; the method is characterized in that: still set up an elastic compression ring on the pump body, elastic compression ring with centering structure cooperation is used for the restriction centering structure is followed deviate from in the installation cavity, centering structure's lateral wall with installation cavity clearance fit. The centering structure is provided with a limiting convex point with smaller size, the structural asymmetry is reduced, the dimensional accuracy of the centering structure is ensured, and the centering structure is loosely matched with a mounting cavity which is arranged on the pump body and is formed by finish machining; through the elastic pressure ring pressed into the pump body, the centering structure is limited to be separated from the mounting cavity, and the limiting salient points form rotation limitation, so that the centering structure is limited to rotate within a certain angle range, the rotor shaft can be automatically centered and adjusted, the pump can be prevented from being blocked, and the centering structure can be prevented from continuously rotating along with the impeller.
In other words: the centering structure can freely rotate in the mounting cavity in a certain range and is used for adjusting the centering assembly of the rotor shaft, and the centering structure in the mounting cavity can rotate in a certain angle range to realize the centering and self-adjusting function of the rotor shaft; the elastic compression ring is used for limiting the centering structure to be separated from the mounting cavity. Under the assembled state, the elastic pressure ring at least partially covers the centering structure in the axial direction, so that the centering structure is prevented from axially moving in a string manner and being separated from the mounting cavity, and the centering structure is stably limited in the mounting cavity.
As further improvement and supplement to the above technical scheme, the utility model discloses a following technical measure:
the centering structure is provided with a limiting convex point, a clamping groove is formed in the elastic pressing ring, the limiting convex point is arranged in the clamping groove, the clamping groove is arc-shaped, the circumferential length of the clamping groove is larger than the diameter of the limiting convex point, and the limiting structure is used for limiting the rotating angle of the centering structure in the installation cavity to be smaller than 360 degrees.
Draw-in groove and spacing bump cooperation for the centering structure is suppressed by elastic compression ring axial and is restricted axial displacement, can make the centering structure again and have certain free rotation ability in the installation cavity, is used for the centering setting of automatically regulated rotor shaft, simultaneously, can make the free rotation angle of centering structure again be less than 360 degrees, prevents that the centering structure from following the impeller and rotating together.
Furthermore, the centering structure is preferably formed by injection molding of special engineering plastics, the limit salient points are preferably arranged at positions which do not affect the overall shrinkage of the centering structure (namely the arrangement of the limit salient points does not affect the overall thermal expansion and cold contraction of the centering structure), and the size of the limit salient points is small, so that the size precision of the centering structure is ensured.
The elastic pressing ring is preferably formed by stamping stainless steel materials, the limiting salient points of the centering structure are located in the clamping grooves of the elastic pressing ring in an assembling state, and the free rotation angle of the preferable centering structure is not smaller than 90 degrees.
The centering structure is of an integral structure, the centering structure comprises an inserting portion, a circular ring portion and a connecting column connected with the inserting portion and the circular ring portion, the second shaft hole is formed in the inserting portion, the circular ring portion is arranged in the installation cavity, and the limiting convex points are arranged on the side wall of the circular ring portion. Usually, the inserting part is located at the upper part of the shaft hole of the impeller (corresponding to the position above the blades), the space between the connecting columns is used for water passing, and the annular part is used for positioning and rotating.
Preferably, the number of the connecting columns is at least three, the connecting columns are axially arranged in parallel, the connecting columns are uniformly distributed along the circumferential direction, the connecting columns are arranged in a central symmetry mode, and a space is reserved between every two adjacent connecting columns. The two ends of the connecting column are respectively provided with an inserting part and a circular ring part, and the spacing space is communicated with the inlet of the impeller.
The periphery of the circular ring part is provided with a flange ring, the flange ring and the circular ring part are of an integral structure, and the limiting salient point is close to the upper surface of the flange ring. The outer diameter of the flange ring is larger than the circular ring part, so that the rigidity and the strength of the centering structure are enhanced, the size stability of the centering structure is improved, the assembly deformation is reduced, the limiting convex points are arranged at the connecting parts of the flange ring and the circular ring part, extend out (and radially outwards extend) from the circular ring part, and do not exceed the outer annular surface of the flange ring in the radial direction.
The elastic compression ring is of an annular structure, the lower surface of the elastic compression ring is matched with the upper surface of the flange ring, namely the elastic compression ring radially presses the flange ring, and the centering structure is axially limited.
The pump body is provided with an annular cavity corresponding to the installation cavity, the elastic compression ring is arranged in the annular cavity, the outer annular wall of the elastic compression ring is in tight fit with the inner wall of the annular cavity, and the inner annular wall of the elastic compression ring is in clearance fit with the rotor shaft.
The insertion part is arranged in the impeller shaft hole and is positioned above the blades on the impeller, the upper end of the circular ring part extends into the impeller inlet, and the circular ring part is matched with the impeller inlet ring at the impeller inlet. The centering structure can be rotatably adjusted within a certain angle range, so that a uniform gap is formed between the annular part and the inner wall of the inlet of the impeller, and the gap is used for controlling the leakage of the ring part of the impeller.
An upper limiting step surface is arranged in the impeller shaft hole and is in interference fit with the upper end surface of the insertion part.
The ring cavity is matched with the impeller inlet ring, and the outer ring wall of the flange ring on the centering structure is in clearance fit with the inner wall of the mounting cavity.
The utility model discloses beneficial effect who has: 1. the centering structure is loosely matched with the pump body, a certain self-aligning function is achieved on the rotor shaft, and risks such as friction, blocking and the like between the impeller opening ring and the corresponding sealing structure or the centering structure are reduced. 2. Through the cooperation of the limiting convex point of the centering structure and the clamping groove of the elastic compression ring, the risk that the centering structure rotates continuously along with the impeller is eliminated.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the centering structure in the present invention.
Fig. 3 is a schematic structural view of the elastic press ring of the present invention.
Fig. 4 is a schematic structural view of the centering structure and the elastic press ring in an assembled state.
Fig. 5 is a partial schematic view of fig. 1.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Example (b): as shown in fig. 1 and 4, a shield circulation pump with an improved centering structure comprises a motor 1, a pump body 2 connected with the motor, an impeller 41 arranged in the pump body; set up rotor shaft 3 in the motor, the cover is arranged in rotor shaft's last rotor assembly 4, set up rotor assembly outlying stator assembly 5, the isolation of rotor assembly and stator assembly's shield cover 6, set up the first shaft hole 61 that is used for assembling rotor shaft one end on the shield cover 6, set up installation cavity 21 on the pump body 2, set up a pair of mesostructure 7 in the installation cavity, the structural second shaft hole 711 that is used for assembling the rotor shaft other end that sets up of centering.
Still set up an elastic compression ring 8 on the pump body 2, elastic compression ring with centering structure cooperation is used for the restriction centering structure is followed deviate from in the installation cavity, centering structure's lateral wall with installation cavity clearance fit.
The first shaft hole 61 and the second shaft hole 711 are coaxially disposed, and both ends of the rotor shaft 3 are fitted in the first shaft hole 61 and the second shaft hole 711, respectively.
Be provided with spacing bump 722 on the centering structure 7, be provided with draw-in groove 81 on the elastic compression ring 8, spacing bump 722 sets up in the draw-in groove 81, the draw-in groove becomes arc, the circumference length of draw-in groove is greater than the diameter of spacing bump is used for the restriction the centering structure is in turned angle in the installation cavity is less than 360 degrees.
Draw-in groove and spacing bump cooperation for the centering structure is suppressed by elastic compression ring axial and is restricted axial displacement, can make the centering structure again and have certain free rotation ability in the installation cavity, is used for the centering setting of automatically regulated rotor shaft, simultaneously, can make the free rotation angle of centering structure again be less than 360 degrees, prevents that the centering structure from following the impeller and rotating together.
Furthermore, the centering structure is preferably injection-molded from a special engineering plastic (such as PPSG 40), the limit bumps are preferably arranged at positions that do not affect the overall shrinkage of the centering structure (i.e., the arrangement of the limit bumps does not affect the overall thermal expansion and cold contraction of the centering structure), and the size of the limit bumps is small, so as to ensure the dimensional accuracy of the centering structure.
The elastic pressing ring is preferably formed by stamping stainless steel materials, the limiting salient points of the centering structure are located in the clamping grooves of the elastic pressing ring in an assembling state, and the free rotation angle of the preferable centering structure is not smaller than 90 degrees.
The draw-in groove size is far greater than spacing bump, and at the within range that is less than 360 degrees, the draw-in groove size can be adjusted according to actual design to guarantee the movable angle scope of centering structure, in this embodiment, the draw-in groove size is guaranteed that centering structure can be at 90 degrees within range rotations in the installation cavity.
To being the loose fit mode between mesostructure and the installation cavity in this embodiment, mainly be applied to the pump body material (like the metal pump body, like the copper product) and the pump body that the coefficient of expansion of centering structure (usually for the high strength engineering working of plastics) material differs greatly, with centering structure axial restriction in the installation cavity of the pump body under the effect of elasticity clamping ring (usually for stainless steel), the little radial clearance between the installation cavity of flange ring and the pump body is favorable to rotor assembly from the aligning, it produces friction or card machine with the seal structure or the centering structure that correspond on it to reduce impeller oral ring.
As shown in fig. 2, the centering structure 7 includes an insertion portion 71, a circular portion 72, and a connecting column 73 connecting the insertion portion 71 and the circular portion 72, the second shaft hole 711 is disposed on the insertion portion 71, the limiting protrusions are disposed on the side wall of the circular portion, and the circular portion 72 is disposed in the mounting cavity. The number of the connecting columns 73 is at least three, the connecting columns are axially arranged, the connecting columns are arranged in a central symmetry mode, and space spaces are formed between every two adjacent connecting columns. The centering structure is matched with the impeller and the pump body to form a reasonable water passing structure, so that the flow channel is smoother and smoother.
The periphery of the circular ring part 72 is provided with a flange ring 721, the flange ring 721 and the circular ring part 72 are of an integral structure, the outer diameter of the flange ring is larger than that of the circular ring part, the rigidity and the strength of the centering structure are enhanced, the dimensional stability of the centering structure is improved, the assembly deformation is reduced,
further, the limit protrusions 722 are provided on the outer circumference of the annular portion adjacent to the flange portion, and the limit protrusions 722 extend from the annular portion (and radially outwardly extend) so as not to exceed the outer circumferential surface of the flange ring in the radial direction. The anisotropic shrinkage inconsistency of the centering structure caused by structural asymmetry is reduced as much as possible, and the dimensional accuracy of the centering structure is improved.
As shown in fig. 1 and 3, the elastic pressing ring is of an annular structure, and a lower surface 83 of the elastic pressing ring is matched with an upper surface of the flange ring, that is, the elastic pressing ring radially presses the flange ring to axially limit the centering structure. The elastic press ring 8 is formed by stamping stainless steel plates.
The pump body is provided with an annular cavity 22 corresponding to the installation cavity, the elastic compression ring 8 is arranged in the annular cavity, the outer annular wall 82 of the elastic compression ring is in tight fit with the inner wall of the annular cavity, and the inner annular wall of the elastic compression ring is in clearance fit with the rotor shaft.
The ring cavity is matched with the impeller inlet ring, and the outer ring wall of the flange ring on the centering structure is in clearance fit with the inner wall of the mounting cavity.
As shown in fig. 1 and 5, the assembly relationship between the centering structure and the impeller is further described in detail, the centering structure 7 passes through an impeller shaft hole on the impeller 41, the circular ring part 72 extends into an impeller inlet 411, and the circular ring part 72 and an impeller mouth ring at the impeller inlet form a mouth ring sealing fit for controlling leakage at the impeller mouth ring part. The centering structure 7 can be rotationally adjusted in a certain angle range, so that the gap of the mouth ring is uniform.
The spigot 71 extends above the impeller shaft bore (the spigot extends upwardly and above the vanes in the orientation shown in figure 1 and in which figure 1 is arranged) to engage with the rotor shaft 3. An upper limiting step surface 41-1 is arranged in the impeller shaft hole, and the upper limiting step surface is in interference fit with the upper end surface of the insertion part.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. In the above embodiments, the present invention may be variously modified and changed. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The shielding circulating pump with the improved centering structure comprises a motor, a pump body connected with the motor and an impeller arranged in the pump body; the motor is internally provided with a rotor shaft, a rotor assembly sleeved on the rotor shaft, a stator assembly arranged on the periphery of the rotor assembly and a shielding sleeve for isolating the rotor assembly and the stator assembly, wherein the shielding sleeve is provided with a first shaft hole for assembling one end of the rotor shaft, the pump body is provided with an installation cavity, a pair of centering structures are arranged in the installation cavity, and a second shaft hole for assembling the other end of the rotor shaft is arranged on the centering structure;
the method is characterized in that: still set up an elastic compression ring on the pump body, elastic compression ring with centering structure cooperation is used for the restriction centering structure is followed deviate from in the installation cavity, centering structure's lateral wall with installation cavity clearance fit.
2. The shielding circulating pump with the improved centering structure as claimed in claim 1, wherein a limit bump is arranged on the centering structure, a clamping groove is arranged on the elastic pressing ring, the limit bump is arranged in the clamping groove, the clamping groove is arc-shaped, the circumferential length of the clamping groove is greater than the diameter of the limit bump, and the limit bump is used for limiting the rotation angle of the centering structure in the installation cavity to be less than 360 degrees.
3. The shielding circulating pump with the improved centering structure as claimed in claim 2, wherein the centering structure is an integral structure, the centering structure comprises a plug portion, a circular ring portion, and a connecting column connecting the plug portion and the circular ring portion, the second shaft hole is disposed on the plug portion, the circular ring portion is disposed in the mounting cavity, and the limit protrusions are disposed on a side wall of the circular ring portion.
4. The shielding circulating pump with the improved centering structure as claimed in claim 3, wherein there are at least three connecting columns, the connecting columns are axially arranged, the connecting columns are uniformly distributed along the circumferential direction, the connecting columns are arranged in a central symmetry manner, and a spacing space is provided between adjacent connecting columns.
5. The shielded circulating pump with improved centering structure as claimed in claim 3, wherein said circular ring portion has a flange ring at its periphery, said flange ring and said circular ring portion are of an integral structure, and said limit protrusions are close to the upper surface of said flange ring.
6. The shielding circulating pump with improved centering structure as claimed in claim 5, wherein said elastic pressing ring is of an annular structure, and the lower surface of said elastic pressing ring is engaged with the upper surface of said flange ring.
7. The shielding circulating pump with the improved centering structure as claimed in claim 6, wherein the pump body is provided with an annular cavity corresponding to the installation cavity, the elastic pressing ring is disposed in the annular cavity, an outer annular wall of the elastic pressing ring is tightly fitted with an inner wall of the annular cavity, and an inner annular wall of the elastic pressing ring is in clearance fit with the rotor shaft.
8. The shielded circulation pump with improved centering structure as claimed in any one of claims 3 to 6, wherein said insertion part is disposed in the shaft hole of the impeller and above the blades of said impeller, the upper end of said circular ring part extends into the inlet of the impeller, and said circular ring part is fitted with the inlet ring of the impeller at the inlet of the impeller to control the leakage at the inlet ring of the impeller.
9. The shielded circulation pump with improved centering structure as claimed in claim 8, wherein said impeller shaft hole is provided therein with an upper limiting step surface, and said upper limiting step surface is in interference fit with the upper end surface of said insertion part.
10. The shielded circulation pump with improved centering structure of claim 8, wherein said collar cavity is fitted to said impeller inlet collar, and an outer annular wall of said flange collar on said centering structure is in clearance fit with an inner wall of said mounting cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922369593.XU CN211397934U (en) | 2019-12-25 | 2019-12-25 | Shielding circulating pump with improved centering structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922369593.XU CN211397934U (en) | 2019-12-25 | 2019-12-25 | Shielding circulating pump with improved centering structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211397934U true CN211397934U (en) | 2020-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922369593.XU Active CN211397934U (en) | 2019-12-25 | 2019-12-25 | Shielding circulating pump with improved centering structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211397934U (en) |
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2019
- 2019-12-25 CN CN201922369593.XU patent/CN211397934U/en active Active
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Effective date of registration: 20201103 Address after: Wenling City, Taizhou City, Zhejiang Province town of Ocean City 317525 Industrial Zone Patentee after: SHIMGE PUMP (ZHEJIANG) Co.,Ltd. Address before: Wenling City, Taizhou City, Zhejiang Province town of Ocean City 317525 Industrial Zone Patentee before: SHIMGE PUMP (ZHEJIANG) Co.,Ltd. Patentee before: SHIMGE PUMP INDUSTRY Co.,Ltd. |