Pump for balancing axial force

Abstract

The utility model relates to a pump for balancing axial force, which solves the problems that a rotor shaft bearing in the prior art is not enough in supporting force and is damaged due to the axial force, and the like, and adopts the technical scheme that the pump comprises a motor main body, a pump main body, a rotor shaft extending out of the motor main body, and a pump shaft extending out of the pump main body, the motor comprises a motor main body, a rotor shaft connected with the motor main body, a pump shaft connected with the rotor shaft and the pump shaft, and a coupler connected with the rotor shaft and the pump shaft, and is characterized in that at least one bearing pack is arranged on the coupler, and a bearing seat matched with the bearing pack, the bearing seat is fixed on a shell of the motor main body, each bearing pack comprises two reversely arranged bearings, and the two bearings are used for counteracting axial force generated by operation of the pump main body. The water pump has the advantages that axial force of the water pump and axial force of the rotor shaft can be counteracted by the aid of the bearing pack, damage of the axial force to the motor is reduced or even avoided, bearing capacity of the bearing is improved, the rotor shaft runs stably, abrasion caused by abrasion is reduced, and the service life of the bearing and the service life of the motor are prolonged.

Description

Technical Field

[0001] The utility model relates to the field of pumps, in particular to a pump for balancing axial forces. Background Art

[0002] The operating principle of a multi-stage pump is that the motor rotates the pump shaft, driving the impeller to generate centrifugal force. This centrifugal force creates a negative pressure zone at the impeller's water inlet, which draws liquid into the pump body. After passing through the multi-stage impeller, the liquid is discharged through the water outlet. Existing multi-stage pumps have several problems due to the single bearing on the rotor shaft: 1. The single bearing lacks sufficient support, making the rotor shaft prone to misalignment, resulting in friction between the rotor and stator. This friction and wear reduces the motor's service life and increases maintenance costs. 2. The axial force generated by the pump during operation, when acting on the single bearing, can easily be transmitted to the motor's interior, causing motor failure and requiring downtime for repairs. 3. When both the pump's axial force and the rotor shaft's axial force act on the bearing, the single bearing struggles to balance the two forces, causing the bearing to overheat and even damage, thus affecting the pump's performance and reliability. Summary of the Invention

[0003] The purpose of the present utility model is to solve the above-mentioned problems existing in the prior art and to provide a pump with balanced axial force. The pump adopts a bearing group, and each bearing group has two bearings arranged in opposite directions. The two bearings arranged in opposite directions can offset the axial force of the water pump and the axial force of the rotor shaft, reduce or even avoid the destructive effect of the axial force on the motor, and at the same time improve the bearing load-bearing capacity, so that the rotor shaft runs smoothly, reduce the wear caused by wear, and increase the service life of the bearings and the motor.

[0004] The above technical objectives of the present invention are mainly solved through the following technical solutions: a pump for balancing axial forces, comprising a motor body, a pump body, a rotor shaft extending from the motor body, a pump shaft extending from the pump body, and a coupling connecting the rotor shaft and the pump shaft, characterized in that a bearing group is arranged on the coupling, a bearing seat cooperates with the bearing group, the bearing seat is fixed to the housing of the motor body, the bearing group is at least one group, each group of the bearing group includes two bearings arranged in opposite directions, and the two bearings are used to offset the axial force generated by the operation of the pump body. In this technical solution, a bearing group is adopted, and the bearing group can be one or more groups, and each group of the bearing group has two bearings arranged in opposite directions. The two bearings arranged in opposite directions can offset the axial force of the water pump and the axial force of the rotor shaft, reduce or even avoid the destructive effect of the axial force on the motor, and at the same time improve the bearing load-bearing capacity, so that the rotor shaft runs smoothly, reduce the wear caused by wear, and increase the service life of the bearings and the motor.

[0005] As a further improvement and supplement to the above technical solution, the present invention employs the following technical measures: a foolproof structure is provided on one end wall of the bearing, so that the two bearings fit tightly against each other, and the two foolproof structures are arranged in opposite directions. The foolproof structure prevents incorrect assembly of the bearings, improves assembly efficiency, and ensures that the two bearings are arranged in opposite directions.

[0006] Preferably, the bottom of the bearing seat cavity is provided with a foolproof mating structure for mating with the foolproof structure. The provision of the foolproof mating structure facilitates absorbing the axial dimension of the foolproof structure, allowing the end face of the bearing to fit the bottom surface of the cavity of the bearing seat body, thereby facilitating axial positioning of the bearing and providing effective axial support.

[0007] Preferably, the foolproof structure is an axially protruding protrusion or convex ring, and the foolproof matching structure is an axially recessed concave ring. The radial and axial dimensions of the foolproof structure are adapted to the radial and axial dimensions of the foolproof matching structure, and the foolproof structure is inserted into the foolproof matching structure. The foolproof matching structure being a concave ring facilitates the insertion of the foolproof structure, thereby improving assembly efficiency.

[0008] Preferably, the foolproof structure is provided on the outer ring of the bearing, which is helpful to ensure the overall strength of the bearing.

[0009] Preferably, the bearing seat includes a bearing seat body and a bearing locating cap. The bearing seat body defines a bearing cavity with one end open, the bearing assembly is disposed in the bearing cavity, and the bearing locating cap covers the open portion of the bearing seat body, thereby confining the bearing assembly within the bearing seat body. The provision of the bearing locating cap facilitates assembly of the bearing into the inner cavity of the bearing seat, thereby improving assembly efficiency.

[0010] Preferably, a positioning structure is provided on the inner wall of the bearing positioning cover. The positioning structure is a protruding ring with an inner end pressed against the outer end wall of the corresponding bearing. The positioning structure and the anti-fouling structure on the bearing are offset, and the radial dimension of the positioning structure matches the radial dimension of the anti-fouling structure. The provision of the positioning structure helps absorb the axial dimension of the anti-fouling structure, providing a larger support area for the end of the bearing and improving assembly stability.

[0011] Preferably, the radius of the inscribed circle of the positioning structure is greater than the radius of the circumscribed circle of the anti-fouling structure. The positioning structure is disposed on the periphery of the anti-fouling structure and cooperates with a retaining member such as a retaining ring disposed in the shaft hole of the bearing to limit both the inner and outer sides of the bearing, thereby improving bearing assembly stability.

[0012] Preferably, the coupling includes a first connecting portion and a second connecting portion that are detachably connected, the first connecting portion including a first clamping structure and a second clamping structure, the second clamping structure and the second clamping structure being clamped together and forming a detachable fixed connection through a connecting piece, for detachably clamping the pump shaft. The detachably connected first and second connecting portions facilitate separation of the motor body and the pump body by disassembling and assembling the first and second connecting portions without disassembling the motor end, thereby improving assembly efficiency. The detachably fixed connection between the first and second clamping structures facilitates removal of the first connecting portion from the pump shaft, thereby improving the efficiency of disassembly and assembly of the internal structure of the pump body.

[0013] Preferably, the second connecting portion is connected to the rotor shaft via a key, the second connecting portion passes through the bearing positioning cover, the bearing assembly and the bearing seat, and the bearing positioning cover and the second connecting portion are clearance-fitted.

[0014] The beneficial effects of the present invention are as follows: 1. A bearing group is adopted, and each bearing group has two bearings arranged in opposite directions. The two bearings arranged in opposite directions can offset the axial force of the water pump and the axial force of the rotor shaft, reduce or even avoid the destructive effect of the axial force on the motor, and at the same time improve the bearing load-bearing capacity, so that the rotor shaft can run smoothly, reduce the wear caused by wear, and increase the service life of the bearing and the motor. 2. An anti-fool structure is set on one end face of the bearing to facilitate the efficient and smooth assembly of the bearing group and ensure that the bearings in the bearing group are set in opposite directions. 3. The axial limiting structure such as the retaining ring set by the positioning structure and the shaft hole of the bearing is conducive to improving the bearing assembly stability and improving the bearing operation stability. 4. The setting of the positioning structure and the anti-fool matching structure is conducive to absorbing the radial dimension of the anti-fool structure, so that the end face of the bearing has a larger bearing area, which is conducive to further improving the bearing assembly stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a partial cross-sectional structural schematic diagram of the utility model.

[0016] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0017] Figure 3 yes Figure 1 A structural diagram of the middle bearing seat.

[0018] Figure 4 yes Figure 1 Schematic diagram of the structure of the cross-section part.

[0019] In the figure: 1. Motor body; 2. Pump body; 3. Rotor shaft; 4. Pump shaft; 5. Coupling; 6. Bearing group; 8. Anti-foolproof structure; 9. Anti-foolproof matching structure; 10. Bearing positioning cover; 11. Bearing seat body; 12. Positioning structure; 13. Axial limiting structure; 14. First clamp structure; 15. Second clamp structure; 16. Second connecting end; 17. First connecting end. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be further specifically described below with reference to embodiments and in conjunction with the accompanying drawings.

[0021] Example: Figures 1-4 As shown, a pump for balancing axial forces includes a motor body 1, a pump body 2, a rotor shaft 3 extending from the motor body 1, a pump shaft 4 extending from the pump body 2, and a coupling 5 connecting the rotor shaft 3 and the pump shaft 4.

[0022] The difference between this technical solution and the prior art is that a bearing group 6 is provided on the coupling 5, the bearing group 6 is provided in the inner cavity of the bearing seat, the bearing seat is fixed on the housing of the motor body 1, and the bearing group 6 is at least one group, each group of the bearing group includes two bearings arranged in opposite directions, and the two bearings are used to offset the axial force generated by the operation of the pump body 2.

[0023] The present technical solution adopts a bearing group 6, which can be one or more than one group. Each bearing group 6 has two bearings arranged in opposite directions. The two bearings arranged in opposite directions can offset the axial force of the water pump and the axial force of the rotor shaft 3, reduce or even avoid the destructive effect of the axial force on the motor, and at the same time improve the bearing load-bearing capacity, so that the rotor shaft 3 runs smoothly, reduce the wear caused by wear, and increase the service life of the bearing and the motor.

[0024] In this embodiment, the bearing group 6 is preferably a group, and the bearing is preferably a 7000C (AC, B) / DB type bearing, that is, a single row angular contact ball bearing.

[0025] In this embodiment, by disposing two bearings facing each other within the bearing seat, the axial force generated by the water pump body 2 when the motor body 1 drives the water pump body 2 can be offset, thereby preventing the generated axial force from being transmitted to the motor body 1 and thus preventing bearing damage during the transmission of the axial force. Furthermore, the bearing assembly 6, consisting of two single-row angular contact ball bearings 6, can achieve a higher maximum speed than a double-row angular contact ball bearing with corresponding parameters, and its axial load capacity is also greater, thereby extending the bearing's service life.

[0026] Further improve and optimize the above technical solutions:

[0027] In actual application, a foolproof structure 8 is provided on one end wall of the bearing, and the two bearings are tightly fitted with each other, and the two foolproof structures 8 are arranged in opposite directions. The setting of the foolproof structure 8 prevents the bearings from being assembled in the wrong direction, which is conducive to improving assembly efficiency and ensuring that the two bearings are arranged in opposite directions.

[0028] In actual application, the bottom of the cavity of the bearing seat is provided with an anti-foolproof matching structure 9 for matching with the anti-foolproof structure 8. The provision of the anti-foolproof matching structure 9 is conducive to absorbing the axial dimension of the anti-foolproof structure 8, so that the end face of the bearing can fit the cavity bottom surface of the bearing seat body 11, which is conducive to axially limiting the bearing and providing effective axial support.

[0029] In actual application, the foolproof structure 8 is an axially protruding protrusion or convex ring, and the foolproof matching structure 9 is an axially recessed concave ring. The radial and axial dimensions of the foolproof structure 8 are adapted to the radial and axial dimensions of the foolproof matching structure 9, and the foolproof structure 8 is inserted into the foolproof matching structure 9. The foolproof matching structure 9 being a concave ring facilitates the insertion of the foolproof structure 8, thereby improving assembly efficiency. In this embodiment, the foolproof structure 8 is preferably a convex ring structure.

[0030] In practical applications, the foolproof structure 8 is provided on the outer ring of the bearing, which is beneficial to ensure the overall strength of the bearing.

[0031] In actual application, the bearing seat includes a bearing seat body 11 and a bearing positioning cover 10. The bearing seat body 11 has a bearing cavity with one end open, and the bearing group 6 is disposed in the bearing cavity. The bearing positioning cover 10 covers the open portion of the bearing seat body 11, thereby confining the bearing group 6 within the bearing seat body 11. The provision of the bearing positioning cover 10 facilitates the installation of the bearing group 6 into the inner cavity of the bearing seat, thereby improving assembly efficiency.

[0032] In actual use, a positioning structure 12 is provided on the inner wall of the bearing positioning cover 10. The positioning structure 12 is a raised ring with an inner end pressed against the outer end wall of the corresponding bearing. The positioning structure 12 and the anti-fouling structure 8 on the bearing are offset, and the radial dimension of the positioning structure 12 is adapted to the radial dimension of the anti-fouling structure 8. The provision of the positioning structure 12 helps absorb the axial dimension of the anti-fouling structure 8, providing a larger support area for the end of the bearing and improving assembly stability.

[0033] In practical applications, let the depth of the bearing accommodating cavity in the bearing seat body 11 be H, the thickness of the bearing be B, and the height of the positioning structure 12 (positioning ring) on ​​the bearing positioning cover 10 be h, then H=2B+h

[0034] In practical applications, the radius of the inscribed circle of the positioning structure 12 is greater than the radius of the circumscribed circle of the anti-fouling structure 8. The positioning structure 12 is disposed on the periphery of the anti-fouling structure 8 and cooperates with an axial limiting structure 13, such as a retaining ring, disposed in the shaft hole of the bearing, so that both the inner and outer sides of the bearing are limited, which helps to improve the stability of the bearing assembly.

[0035] In actual application, the coupling 5 includes a first connecting portion 17 and a second connecting portion 16 that are detachably connected. The first connecting portion 17 includes a first clamping structure 14 and a second clamping structure 15. The first clamping structure 14 and the second clamping structure 15 are clamped together and detachably fixedly connected via a connector to detachably clamp the pump shaft. The detachably connected first connecting portion 17 and second connecting portion 16 facilitates separation of the motor body and the pump body by disassembling and assembling the first connecting portion 17 and second connecting portion 16 without disassembling the motor end, thereby improving assembly efficiency. The detachably fixed connection between the first clamping structure 14 and the second clamping structure 15 facilitates removal of the first connecting portion 17 from the pump shaft, thereby improving the efficiency of disassembly and assembly of the internal structure of the pump body.

[0036] In practical applications, the second connecting portion 16 is connected to the rotor shaft via a key, and the second connecting portion 16 passes through the bearing locating cover, the bearing assembly and the bearing seat, and the bearing locating cover and the second connecting portion 16 are clearance-fitted.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and variations are possible in the above embodiments. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pump for balancing axial forces, comprising a motor body (1), a pump body (2), a rotor shaft (3) extending from the motor body (1), a pump shaft (4) extending from the pump body (2), and a coupling (5) connecting the rotor shaft (3) and the pump shaft (4), characterized in that A bearing group (6) is provided on the coupling (5), and a bearing seat is matched with the bearing group (6), wherein the bearing seat is fixed on the housing of the motor body (1), and the bearing group (6) is at least one group, and each group of the bearing group includes two bearings arranged in opposite directions, and the two bearings are used to offset the axial force generated by the operation of the pump body (2).

2. The pump for balancing axial forces according to claim 1, characterized in that An anti-fouling structure (8) is provided on one end wall of the bearing, the two bearings are closely fitted to each other, and the two anti-fouling structures (8) are arranged in a manner opposite to each other.

3. The pump for balancing axial forces according to claim 2, characterized in that The bottom of the cavity of the bearing seat is provided with an anti-foolproof matching structure (9) for matching with the anti-foolproof structure (8).

4. The pump for balancing axial forces according to claim 3, characterized in that The fool-proofing structure (8) is an axially protruding protrusion or convex ring, and the fool-proofing matching structure (9) is an axially recessed concave ring. The radial size and axial size of the fool-proofing structure (8) are both adapted to the radial size and axial size of the fool-proofing matching structure (9), and the fool-proofing structure (8) is inserted into the fool-proofing matching structure (9).

5. The pump for balancing axial forces according to claim 4, characterized in that The fool-proof structure (8) is arranged on the outer ring of the bearing.

6. A pump for balancing axial forces according to any one of claims 1 to 5, characterized in that The bearing seat comprises a bearing seat body (11) and a bearing positioning cover (10), wherein the bearing seat body (11) has a bearing cavity with one end open, the bearing group (6) is arranged in the bearing cavity, and the bearing positioning cover (10) covers the open portion of the bearing seat body (11), so that the bearing group (6) is confined within the bearing seat body (11).

7. The pump for balancing axial forces according to claim 6, characterized in that A positioning structure (12) is provided on the inner wall of the bearing positioning cover (10), wherein the positioning structure (12) is a convex ring with a protrusion, and the inner end of the positioning structure (12) is pressed against the outer end wall of the corresponding bearing, and the positioning structure (12) and the anti-fool structure (8) on the bearing are staggered, and the radial size of the positioning structure (12) is adapted to the radial size of the anti-fool structure (8).

8. The pump for balancing axial forces according to claim 7, characterized in that The radius of the inscribed circle of the positioning structure (12) is greater than the radius of the circumscribed circle of the fool-proofing structure (8).

9. The pump for balancing axial forces according to claim 6, characterized in that The coupling (5) comprises a first connecting portion (17) and a second connecting portion (16) that are detachably connected, the first connecting portion (17) comprising a first clamping hoop structure (14) and a second clamping hoop structure (15), the second clamping hoop structure (15) being clamped to the second clamping hoop structure (15) and forming a detachable fixed connection through a connecting piece, for detachably clamping the pump shaft (4).

10. The pump for balancing axial forces according to claim 9, characterized in that The second connecting portion (16) is connected to the rotor shaft (3) via a key, the second connecting portion (16) passes through the bearing positioning cover (10), the bearing assembly (6) and the bearing seat, and the bearing positioning cover (10) and the second connecting portion (16) are clearance-fitted.

Images