Vertical double-suction pipeline pump

Abstract

The utility model belongs to the technical field of pump equipment, and relates to a vertical double-suction pipeline pump. The vertical double-suction pipeline pump comprises a motor, a pump body, a pump shaft and an impeller, an output shaft of the motor is connected with the pump shaft, the impeller is fixed to the pump shaft, the pump body is provided with a thrust bearing assembly and a sliding bearing assembly at intervals in the axial direction of the pump shaft, and the pump shaft penetrates through the thrust bearing assembly and the sliding bearing assembly and is connected with the thrust bearing assembly and the sliding bearing assembly in a matched mode. The thrust bearing assembly and the sliding bearing assembly support the pump shaft. Due to the fact that the thrust bearing assembly and the sliding bearing assembly are arranged on the pump body, the pump shaft can be supported in the axial direction and the radial direction, loads on the motor and the output shaft are reduced, and the stability of the pump during operation is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of pump equipment and relates to a vertical double-suction pipeline pump. Background Art

[0002] Vertical single-suction pipeline pumps and vertical double-suction pipeline pumps are new energy-saving pumps specially used for urban water supply, heating, air conditioning and refrigeration. The basic components include a high-speed rotating impeller and a fixed volute pump casing. The impeller is driven by an electric motor and rotates at high speed with the pump shaft.

[0003] When the pump starts, the impeller drives the liquid to rotate, and under the action of inertial centrifugal force, the liquid flows from the center of the impeller to the periphery. The energy obtained by the liquid flowing through the impeller increases the static pressure energy and flow rate.

[0004] When the liquid leaves the impeller and enters the pump housing, the flow path in the housing gradually expands and decelerates, part of the kinetic energy is converted into static pressure energy, and flows into the discharge pipe in a tangential direction.

[0005] The pump shaft of the existing vertical single-suction pipeline pump and vertical double-suction pipeline pump is coaxial with the motor shaft, or the pump shaft and the motor shaft are connected by a rigid coupling. The weight of the pump rotor components and the axial force generated during operation must be borne by the motor, which increases the requirement that the motor must additionally bear the axial force of the pump head, affecting the stability of the pump during operation. Utility Model Content

[0006] In order to improve the stability of the pump during operation, the present application provides a vertical double-suction pipeline pump.

[0007] A vertical double-suction pipeline pump provided in this application adopts the following technical solution:

[0008] A vertical double-suction pipeline pump comprises a motor, a pump body, a pump shaft and an impeller, wherein the output shaft of the motor is connected to the pump shaft, the impeller is fixed on the pump shaft, the pump body is provided with a thrust bearing assembly and a sliding bearing assembly at intervals along the axial direction of the pump shaft, the pump shaft passes through the thrust bearing assembly and the sliding bearing assembly, and is cooperatively connected with the thrust bearing assembly and the sliding bearing assembly, and the thrust bearing assembly and the sliding bearing assembly form support for the pump shaft.

[0009] By adopting the above technical solution, the motor runs, and the output shaft drives the pump shaft to rotate, which drives the impeller to rotate to achieve liquid transportation. Since the pump body is provided with a thrust bearing assembly and a sliding bearing assembly, axial and radial support can be formed for the pump shaft, reducing the load on the motor and the output shaft, and improving the stability of the pump during operation.

[0010] Preferably, the thrust bearing assembly comprises two angular contact ball bearings arranged along the axial direction of the pump shaft, and the two angular contact ball bearings are arranged back to back or opposite to each other.

[0011] By adopting the above technical solution, two angular contact ball bearings are arranged in back-to-back or opposite directions. When the pump is in a non-rated operating point or shutdown state, the axial force generated by the pump shaft, impeller, etc. is borne by the pump body, and the motor only needs to bear its own axial force, thereby reducing the load on the motor output shaft. In particular, when the angular contact ball bearings are arranged in back-to-back directions, they are not easy to get stuck when heated.

[0012] Preferably, the thrust bearing assembly further comprises a bearing body and a bearing body bracket, wherein the bearing body bracket is fixed to the pump body, the bearing body is fixed to the bearing body bracket, the bearing body is provided with an installation cavity, and the angular contact ball bearing is arranged in the installation cavity.

[0013] By adopting the above technical solution, the angular contact ball bearing is arranged on the pump body through the bearing body and the bearing body bracket.

[0014] Preferably, a mounting hole is provided at the lower end of the pump body, the sliding bearing assembly is arranged in the mounting hole, and a sliding bearing end cover for sealing the mounting hole is also provided at the lower end of the pump body, a lubrication cavity is formed between the sliding bearing end cover, the sliding bearing assembly and the pump shaft, and the double-suction pipeline pump also includes a lubrication pipeline connected to the lubrication cavity.

[0015] By adopting the above technical solution, the lubricating oil flows out from the pump body and then flows into the lubrication cavity through the lubrication pipeline, which can cool the sliding bearing while lubricating the sliding bearing.

[0016] Preferably, a matching lower pump body sealing ring and a lower impeller sealing ring are arranged between the pump body and the impeller, the lower pump body sealing ring is fixed on the pump body, and the lower impeller sealing ring is fixed on the impeller; a pump cover is arranged on the upper end of the pump body, and a matching upper pump body sealing ring and an upper impeller sealing ring are arranged between the pump cover and the impeller, the upper pump body sealing ring is fixed on the pump cover, and the upper impeller sealing ring is fixed on the impeller.

[0017] By adopting the above technical solution and providing the upper impeller sealing ring and the lower impeller sealing ring, the overall sealing performance of the pump is improved.

[0018] Preferably, the outer diameter of the upper impeller sealing ring is greater than the outer diameter of the lower impeller sealing ring.

[0019] By adopting the above technical solution, when the pump is running and generating working pressure, an upward axial force will be generated to offset the downward axial force generated by the weight of the pump shaft itself, so that the pump can achieve self-balancing of the axial force.

[0020] Preferably, the outer circular surface of the upper impeller sealing ring is spaced apart from the inner circular surface of the upper pump body sealing ring, and the outer circular surface of the upper impeller sealing ring is provided with a plurality of grooves, and the outer circular surface of the lower impeller sealing ring is spaced apart from the inner circular surface of the lower pump body sealing ring, and the outer circular surface of the lower impeller sealing ring is provided with a plurality of grooves.

[0021] By adopting the above technical solution, a number of grooves are provided on the outer circumferential surface of the upper impeller sealing ring, which can form a labyrinth seal with the upper pump body sealing ring, reduce liquid leakage from the high-pressure area of ​​the pump to the low-pressure area, and improve the volumetric efficiency of the pump. The lower impeller sealing ring and the lower pump body sealing ring can also play the above role.

[0022] Preferably, the impeller is a double-suction impeller, and the pump body is a double-volute pump body.

[0023] By adopting the above technical solution, the flow rate of the double-suction impeller can be increased by nearly one-fold compared with the single-suction impeller of the same radial size, so that the pump occupies a smaller area at the same flow rate.

[0024] Preferably, a partition plate 1 is provided in the middle of the extrusion flow channel of the pump body.

[0025] By adopting the above technical solution, a partition plate 1 is arranged in the middle of the extrusion flow channel of the pump body, so that the radial force of the pump can be self-balanced and the rigidity and strength of the pump body can be improved.

[0026] Preferably, a second partition is provided in the middle of the suction channel of the pump body, and the second partition extends to the suction port of the impeller.

[0027] By adopting the above technical solution, the suction flow channel of the pump body is provided with a second partition plate, which not only plays a role in guiding the flow, but also improves the rigidity and strength of the pump body and the pump cover.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. Since the pump body is provided with a thrust bearing assembly and a sliding bearing assembly, it can provide axial and radial support for the pump shaft, reduce the load on the motor and the output shaft, and improve the stability of the pump during operation;

[0030] 2. When the pump is running and generating working pressure, an upward axial force will be generated to offset the downward axial force generated by the weight of the pump shaft itself, so that the pump can achieve self-balance of axial force. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a cross-sectional view of an embodiment of the present application.

[0032] Figure 2 It is a partial schematic diagram of an embodiment of the present application, used to show partition one and partition two.

[0033] Figure 3 yes Figure 1 Enlarged view of part A.

[0034] Figure 4 yes Figure 1 Enlarged view of part B.

[0035] Explanation of the accompanying drawings: 1. pump body; 2. pump shaft; 3. impeller; 4. coupling; 6. mechanical seal sleeve; 7. lower pump body sealing ring; 8. lower impeller sealing ring; 9. pump cover; 10. mechanical seal; 11. upper pump body sealing ring; 12. upper impeller sealing ring; 13. groove; 14. thrust bearing assembly; 141. bearing body; 142. bearing body bracket; 143. angular contact ball bearing; 144. angular contact ball bearing end cover; 15. sliding bearing assembly; 151. sliding bearing body; 152. sliding bearing sleeve; 16. sliding bearing end cover; 17. partition one; 18. partition two. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-4 This application is described in further detail.

[0037] like Figure 1 As shown, the vertical double-suction pipeline pump includes a motor, a pump body 1, a pump shaft 2 and an impeller 3.

[0038] The output shaft of the motor is connected to the pump shaft 2. In this embodiment, the output shaft of the motor is connected to the pump shaft 2 through a coupling 4. Preferably, the coupling 4 can adopt an elastic pin coupling 4 to make the pump body 1 and the motor relatively independent, thereby reducing the requirements for the matching motor.

[0039] As another solution, the output shaft may also be directly connected to the pump shaft 2 .

[0040] like Figure 1 As shown, the impeller 3 is fixed on the pump shaft 2.

[0041] In this embodiment, the pump body 1 is provided with a pump cavity and an intake channel and an exhaust channel connected to the pump cavity. The impeller 3 is located in the pump cavity. The intake channel and the exhaust channel are located on the same center line, which is convenient for connection and installation with on-site pipelines.

[0042] Preferably, the impeller 3 is a double-suction impeller, and the pump body 1 is a double-volute pump body.

[0043] Compared with the single-suction impeller 3 of the same radial size, the double-suction impeller 3 can increase the flow rate by nearly one-fold, so that the pump occupies a smaller area at the same flow rate. The double-suction impeller 3 is matched with the pump shaft 2 through the keyway, one end of which is positioned by the shaft shoulder, and the other end is fixed by the impeller stopper sleeve 5, the machine seal sleeve 6 and the impeller 3 nut.

[0044] like Figure 1 , Figure 2As shown, as a preference, a partition 17 is provided in the middle of the discharge flow channel of the pump body 1 , and a partition 2 18 is provided in the middle of the suction flow channel of the pump body 1 , and the partition 2 18 extends to the suction port of the impeller 3 .

[0045] like Figure 1 , Figure 3 As shown, a matching lower pump body sealing ring 7 and a lower impeller sealing ring 8 are arranged between the pump body 1 and the impeller 3 . The lower pump body sealing ring 7 is fixed on the pump body 1 , and the lower impeller sealing ring 8 is fixed on the impeller 3 .

[0046] In this embodiment, a stopper is provided between the lower pump body sealing ring 7 and the pump body 1 and is fixed by a set screw, and a stopper is provided between the lower impeller sealing ring 8 and the impeller 3 and is fixed by a set screw.

[0047] A pump cover 9 is provided at the upper end of the pump body 1 . The pump cover 9 and the pump body 1 are fixed by the cooperation of studs and nuts. A mechanical seal 10 is provided between the pump shaft 2 and the pump cover 9 .

[0048] An upper pump body sealing ring 11 and an upper impeller sealing ring 12 that match each other are arranged between the pump cover 9 and the impeller 3 . The upper pump body sealing ring 11 is fixed on the pump cover 9 , and the upper impeller sealing ring 12 is fixed on the impeller 3 .

[0049] In this embodiment, a stopper is provided between the upper pump body sealing ring 11 and the pump cover 9 and fixed by set screws, and a stopper is provided between the upper impeller sealing ring 12 and the impeller 3 and fixed by set screws.

[0050] In this embodiment, the outer diameter of the upper impeller sealing ring 12 is greater than the outer diameter of the lower impeller sealing ring 8. When the pump runs to generate working pressure, an upward axial force will be generated to offset the downward axial force generated by the weight of the pump shaft 2 itself, so that the pump can achieve self-balancing of the axial force.

[0051] Preferably, the outer circumferential surface of the upper impeller sealing ring 12 and the inner circumferential surface of the upper pump body sealing ring 11 are spaced apart, and a plurality of grooves 13 are provided on the outer circumferential surface of the upper impeller sealing ring 12 to form a labyrinth seal with the upper pump body sealing ring 11; the outer circumferential surface of the lower impeller sealing ring 8 and the inner circumferential surface of the lower pump body sealing ring 7 are spaced apart, and a plurality of grooves 13 are provided on the outer circumferential surface of the lower impeller sealing ring 8 to form a labyrinth seal with the lower pump body sealing ring 7 to reduce liquid leakage from the high-pressure area of ​​the pump to the low-pressure area and improve the volumetric efficiency of the pump; the lower impeller sealing ring 8 and the lower pump body sealing ring 7 can also play the above-mentioned role.

[0052] In this embodiment, the groove 13 is preferably a rectangular groove, which can increase fluid resistance and is also convenient to process.

[0053] As another solution, the groove 13 may also be in various shapes such as trapezoidal, circular, semicircular, etc.

[0054] like Figure 1 , Figure 4 As shown, the pump body 1 is provided with a thrust bearing assembly 14 and a sliding bearing assembly 15 at intervals along the axial direction of the pump shaft 2. The pump shaft 2 passes through the thrust bearing assembly 14 and the sliding bearing assembly 15 and is cooperatively connected with the thrust bearing assembly 14 and the sliding bearing assembly 15. The thrust bearing assembly 14 and the sliding bearing assembly 15 support the pump shaft 2.

[0055] Specifically, the thrust bearing assembly 14 includes a bearing body 141 , a bearing body bracket 142 , and two angular contact ball bearings 143 arranged along the axial direction of the pump shaft 2 .

[0056] The bearing body bracket 142 is fixed on the pump body 1, and the bearing body 141 is fixed on the bearing body bracket 142. The bearing body 141 is provided with an installation cavity, and two angular contact ball bearings 143 are arranged in the installation cavity. In this embodiment, the two angular contact ball bearings 143 are arranged back to back, and the lower end face of the lower angular contact ball bearing 143 is positioned by a stopper, and the upper angular contact ball bearing 143 is positioned by an angular contact ball bearing end cover 144. The angular contact ball bearing end cover 144 is fixed to the bearing body 141 by bolts. The angular contact ball bearing end cover 144 is also provided with an oil filling hole and a venting hole. An oil filling cup is provided on the oil filling hole. A skeleton oil seal is provided at the lower end of the bearing body 141 to prevent grease leakage.

[0057] As another solution, two angular contact ball bearings 143 may also be disposed opposite to each other.

[0058] like Figure 1 , Figure 4 As shown, a mounting hole is provided at the lower end of the pump body 1, and a sliding bearing assembly 15 is arranged in the mounting hole. A sliding bearing end cover 16 for sealing the mounting hole is also provided at the lower end of the pump body 1. A lubrication cavity is formed between the sliding bearing end cover 16, the sliding bearing assembly 15 and the pump shaft 2. The pipeline pump also includes a lubrication pipeline connected to the lubrication cavity.

[0059] In this embodiment, the sliding bearing assembly 15 includes a sliding bearing body 151 and a sliding bearing sleeve 152 . The sliding bearing sleeve 152 is sleeved on the pump shaft 2 , and the two are matched via a keyway. The sliding bearing body 151 is sleeved on the sliding bearing sleeve 152 .

[0060] like Figure 1 As shown, preferably, a mechanical seal flushing pipeline is provided in this embodiment, and the flushing liquid is drawn out from the pump body 1 and flows into the mechanical seal flushing port. The liquid flows through the mechanical seal 10 to flush and cool the mechanical seal, and then flows back to the inlet of the impeller 3. The flushing circulation loop is effective and reliable.

[0061] The working principle of this embodiment is as follows: the motor runs, and the output shaft drives the pump shaft 2 to rotate, and drives the impeller 3 to rotate to realize liquid transportation. Since the pump body 1 is provided with a thrust bearing assembly 14 and a sliding bearing assembly 15, axial and radial support can be formed for the pump shaft 2, reducing the load on the motor and the output shaft, and improving the stability of the pump during operation.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A vertical double-suction pipeline pump, characterized in that: The invention comprises a motor, a pump body (1), a pump shaft (2) and an impeller (3), wherein the output shaft of the motor is connected to the pump shaft (2), the impeller (3) is fixed on the pump shaft (2), the pump body (1) is provided with a thrust bearing assembly (14) and a sliding bearing assembly (15) at intervals along the axial direction of the pump shaft (2), the pump shaft (2) passes through the thrust bearing assembly (14) and the sliding bearing assembly (15), and is matched and connected with the thrust bearing assembly (14) and the sliding bearing assembly (15), and the thrust bearing assembly (14) and the sliding bearing assembly (15) form support for the pump shaft (2).

2. The vertical double-suction pipeline pump according to claim 1, characterized in that: The thrust bearing assembly (14) comprises two angular contact ball bearings (143) arranged along the axial direction of the pump shaft (2), and the two angular contact ball bearings (143) are arranged back to back or opposite to each other.

3. The vertical double-suction pipeline pump according to claim 2, characterized in that: The thrust bearing assembly (14) further comprises a bearing body (141) and a bearing body bracket (142); the bearing body bracket (142) is fixed to the pump body (1); the bearing body (141) is fixed to the bearing body bracket (142); the bearing body (141) is provided with an installation cavity; the angular contact ball bearing (143) is arranged in the installation cavity.

4. The vertical double-suction pipeline pump according to claim 1, 2 or 3, characterized in that: The lower end of the pump body (1) is provided with a mounting hole, the sliding bearing assembly (15) is arranged in the mounting hole, and the lower end of the pump body (1) is also provided with a sliding bearing end cover (16) for sealing the mounting hole, a lubrication cavity is formed between the sliding bearing end cover (16), the sliding bearing assembly (15) and the pump shaft (2), and the double-suction pipeline pump also includes a lubrication pipeline connected to the lubrication cavity.

5. The vertical double-suction pipeline pump according to claim 1, 2 or 3, characterized in that: A matching lower pump body sealing ring (7) and a lower impeller sealing ring (8) are arranged between the pump body (1) and the impeller (3); the lower pump body sealing ring (7) is fixed on the pump body (1), and the lower impeller sealing ring (8) is fixed on the impeller (3); a pump cover (9) is arranged at the upper end of the pump body (1); a matching upper pump body sealing ring (11) and an upper impeller sealing ring (12) are arranged between the pump cover (9) and the impeller (3); the upper pump body sealing ring (11) is fixed on the pump cover (9), and the upper impeller sealing ring (12) is fixed on the impeller (3).

6. The vertical double-suction pipeline pump according to claim 5, characterized in that: The outer diameter of the upper impeller sealing ring (12) is greater than the outer diameter of the lower impeller sealing ring (8).

7. The vertical double-suction pipeline pump according to claim 5, characterized in that: The outer circumferential surface of the upper impeller sealing ring (12) and the inner circumferential surface of the upper pump body sealing ring (11) are spaced apart, and the outer circumferential surface of the upper impeller sealing ring (12) is provided with a plurality of grooves (13); the outer circumferential surface of the lower impeller sealing ring (8) and the inner circumferential surface of the lower pump body sealing ring (7) are spaced apart, and the outer circumferential surface of the lower impeller sealing ring (8) is provided with a plurality of grooves (13).

8. The vertical double-suction pipeline pump according to claim 1, 2 or 3, characterized in that: The impeller (3) is a double-suction impeller, and the pump body (1) is a double-volute pump body.

9. The vertical double-suction pipeline pump according to claim 1, 2 or 3, characterized in that: A partition plate (17) is arranged in the middle of the extrusion flow channel of the pump body (1).

10. The vertical double-suction pipeline pump according to claim 1, 2 or 3, characterized in that: A second partition plate (18) is provided in the middle of the suction flow channel of the pump body (1), and the second partition plate (18) extends to the suction port of the impeller (3).

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