Mining axial force self-balancing drainage pump

Abstract

The utility model belongs to the technical field of mining self-balancing multistage centrifugal pumps, and particularly relates to a mining axial force self-balancing drainage pump which comprises a shell and a pump shaft arranged in the axial direction of the shell, a first pressurizing section and a second pressurizing section are arranged on the pump shaft, and impellers of the first pressurizing section and the second pressurizing section are the same in number and are arranged oppositely. An annular partition plate is fixedly arranged in the middle in the shell. Static rings are arranged at the two ends of the inner side of the partition plate. A balance assembly is arranged between the first pressurization section and the second pressurization section and comprises a bearing piece and two movable rings, and the bearing piece is located between the partition plate and the pump shaft and comprises two conical roller bearings installed in the forward direction. The two static rings are located between the two moving rings, and the static rings make close contact with the opposite sides of the corresponding moving rings. According to the centrifugal pump, the balance assembly is additionally arranged on the pump shaft between the oppositely-arranged impellers, and then axial force is prevented from being generated in the working process of the centrifugal pump through the conical roller bearing which is installed in the forward direction and the movable ring and the static ring which are oppositely arranged.

Description

Technical Field

[0001] The utility model belongs to the technical field of self-balancing multi-stage centrifugal pumps for mines, in particular to an axial force self-balancing drainage pump for mines. Background Art

[0002] A multi-stage centrifugal pump is a medium conveying device in which a flowing medium (gas and liquid, or a mixture of suspended particles and gas or liquid) enters through the root of the blade shaft (inlet). The medium is generated by the centrifugal force generated by the high-speed rotating blades, generating a high pressure, which flows out through the pressure relief port (outlet). A multi-stage centrifugal pump is a combination of two or more pumps with the same function. In terms of fluid channel structure, the medium pressure relief port of the first stage is connected to the inlet of the second stage, and the medium pressure relief port of the second stage is connected to the inlet of the third stage. This series connection forms a multi-stage centrifugal pump.

[0003] Compared with multi-stage centrifugal pumps, self-balancing multi-stage centrifugal pumps adopt the method of back-to-back installation of impellers and eliminate the balance plate or balance drum, which simplifies the overall structure of the multi-stage centrifugal pump. It not only improves the head of the multi-stage centrifugal pump, but also reduces the leakage of the multi-stage centrifugal pump. It has the characteristics of high efficiency, energy saving, safe and stable operation. It is widely used in high-head fluid transportation fields such as mine drainage, and is also called mining self-balancing multi-stage centrifugal pump.

[0004] The current self-balancing multi-stage centrifugal pump for mining adopts a back-to-back impeller installation method. That is, water or other conveyed fluid enters the centrifugal pump from the water inlet and is pressurized by a set of impellers (one or more impellers in each set) before being conveyed to another set of impellers arranged opposite to the previous set of impellers for further pressurization and then discharged from the centrifugal pump outlet. In this process, the pressure of the conveyed water or other fluid is completed by multiple impellers. At the same time, the axial force generated during the pressurization process is offset by the two sets of impellers arranged opposite to each other, thereby preventing the pump shaft from being subjected to long-term axial force damage to the power mechanism such as the motor that drives the pump shaft to rotate. However, the water pressure from the centrifugal pump inlet to the outlet after pressurization of the first set of impellers is generally lower than the water pressure at the inlet of the second set of impellers and the outlet of the centrifugal pump. As a result, in actual use, the axial forces generated by the impellers arranged opposite to each other on the pump shaft are not exactly the same. The two sets of impellers arranged opposite to each other cannot completely offset the axial force generated on the pump shaft by the multi-stage centrifugal pump during the pressurization and conveying of the fluid, which can easily cause failures and damage to the motor equipment during long-term use. Summary of the Invention

[0005] In order to solve the problem that the axial force of the existing self-balancing multi-stage centrifugal pump for mining cannot be completely offset during use, which leads to the easy failure and damage of the equipment during long-term use, the utility model provides a mining axial force self-balancing drainage pump. By adding a balancing component to the pump shaft between the first boosting section and the second boosting section, the axial force is avoided during the operation of the centrifugal pump by using a positively installed tapered roller bearing and a relatively arranged dynamic ring and static ring.

[0006] In order to achieve the above purpose, the technical solution of the utility model is:

[0007] A mining axial force self-balancing drainage pump comprises a shell and a pump shaft arranged axially along the shell, a suction port and a discharge port are arranged on the shell, a first boosting section and a second boosting section are arranged on the pump shaft, the first boosting section and the second boosting section are both composed of a plurality of impellers fixedly sleeved on the pump shaft, the first boosting section and the second boosting section have the same number of impellers and are arranged back to back, an annular partition plate is fixedly arranged in the middle of the shell, the partition plate separates the first boosting section from the second boosting section, static rings are fixedly arranged at both ends of the inner side of the partition plate, low-pressure water enters from the suction port, is pressurized by the first boosting section and the second boosting section, and high-pressure water is discharged from the discharge port.

[0008] A balancing assembly is provided between the first boost section and the second boost section, and the balancing assembly includes a bearing member fixedly mounted on the pump shaft and two dynamic rings. The bearing member is located between the two dynamic rings, and the bearing member is located between the partition plate and the pump shaft. The bearing member includes two tapered roller bearings installed in a forward direction, and the inner rings of the two tapered roller bearings are fixedly connected to each other and are both fixedly mounted on the pump shaft; the two static rings are located between the two dynamic rings, and the static ring is in close contact with the opposite side of the corresponding dynamic ring. The axial forces generated during the operation of the first boost section and the second boost section offset each other, and the excess part is absorbed by the cooperation of the dynamic ring and the static ring, and the two tapered roller bearings absorb part.

[0009] Preferably, the inlet end of the first boosting section is connected to the suction port, and the outlet end is connected to the second boosting section; the inlet end of the second boosting section is connected to the first boosting section, and the outlet end is connected to the discharge port, thereby ensuring that the low-pressure water entering the shell from the suction port is pressurized by the first boosting section and then transported to the inlet end of the second boosting section, and is discharged from the discharge port after being pressurized by the second boosting section.

[0010] Preferably, a delivery pipe is provided outside the shell, one end of the delivery pipe is connected to the outlet of the first boost section, and the other end is connected to the inlet of the second boost section, and the outlet of the first boost section is connected to the inlet of the second boost section through the delivery pipe.

[0011] Preferably, the sides of the stationary ring and the corresponding dynamic ring opposite to each other are both arranged in a stepped shape and match each other, and the installation of the tapered roller bearing is achieved through the cooperation of the stationary ring and the dynamic ring, while offsetting part of the axial force.

[0012] Preferably, an annular groove is opened on the inner side of the partition plate, and the cross-section of the annular groove is V-shaped. The two side walls of the annular groove are respectively connected to the rollers of two tapered roller bearings to form the outer ring structure of two tapered roller bearings. The rotational connection between the pump shaft and the partition plate is realized through the tapered roller bearing structure, and the two inner walls of the V-shaped groove are in contact with the rollers to offset part of the unbalanced axial force.

[0013] Preferably, a cylinder is fixedly provided at both ends of the partition plate, and the end surface of the cylinder away from the partition plate contacts the end surface of the corresponding impeller. The installation of the corresponding impeller is ensured by the cylinder to prevent it from axial movement.

[0014] Through the above technical solution, the beneficial effects of the utility model are:

[0015] 1. The utility model sets a tapered roller bearing structure between the impellers arranged in opposite directions, and adopts a forward installation method to fix the two tapered roller bearing structures on the pump shaft. During the operation of the drainage pump, the axial force generated by the impellers arranged in opposite directions cannot be completely offset. The tapered roller bearings then offset the axial force, thereby achieving axial force balance of the drainage pump and ensuring the rotational connection between the partition plate and the pump shaft.

[0016] 2. The utility model arranges static rings at both ends of the partition plate and a dynamic ring on the pump shaft. The corresponding static rings fit in with the dynamic rings, which makes it easy to install the tapered roller bearings and offsets the axial force generated during the operation of the drainage pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 .

[0018] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 .

[0019] Figure 3 For this utility model Figure 1 Enlarged view of point A in the middle.

[0020] Figure 4 This is a structural diagram of the annular groove of the utility model.

[0021] Figure 5 This is a schematic diagram of the flow direction in the first boosting section of the present invention.

[0022] Figure 6This is a schematic diagram of the flow direction in the second boosting section of the present invention.

[0023] The numbers in the accompanying drawings are: 1 is the casing, 2 is the pump shaft, 3 is the suction port, 4 is the discharge port, 5 is the impeller, 6 is the partition plate, 7 is the static ring, 8 is the dynamic ring, 9 is the bearing, 10 is the delivery pipe, 11 is the annular groove, and 12 is the cylinder. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0025] like Figures 1 to 6 As shown, this embodiment provides a mining axial force self-balancing drainage pump, including a housing 1 and a pump shaft 2 arranged axially along the housing 1, a suction port 3 and a discharge port 4 are provided on the housing 1, and a first boosting section and a second boosting section are provided on the pump shaft 2. The first boosting section and the second boosting section are both composed of a plurality of impellers 5 fixedly sleeved on the pump shaft 2. The first boosting section and the second boosting section have the same number of impellers 5 and are arranged in opposite directions. The impellers 5 arranged in opposite directions make the axial forces generated by the first boosting section and the second boosting section in opposite directions when working, thereby avoiding the generation of the overall axial force to a certain extent. The inlet end of the first boosting section is connected to the suction port 3 and the outlet end is connected to the second boosting section. The inlet end of the second boosting section is connected to the first boosting section and the outlet end is connected to the discharge port 4. When working, the pump shaft 2 is driven to rotate by a power mechanism such as a motor, and the multiple impellers 5 on the pump shaft 2 rotate accordingly. Water enters the housing 1 from the suction port 3, increases pressure energy and kinetic energy through the first boosting section and the second boosting section, and is discharged from the discharge port 4.

[0026] A delivery pipe 10 is provided outside the shell 1, one end of the delivery pipe 10 is connected to the outlet end of the first boosting section, and the other end is connected to the inlet end of the second boosting section. The water pressurized by the first boosting section is transported to the inlet end of the second boosting section through the delivery pipe 10 for re-pressurization and then discharged.

[0027] An annular partition plate 6 is fixedly provided in the middle of the housing 1. The partition plate 6 separates the first pressurization section from the second pressurization section, ensuring that the pressurized water in the first pressurization section can only reach the inlet of the second pressurization section through the delivery pipe. Static rings 7 are fixedly provided at both ends of the inner side of the partition plate 6.

[0028] A balancing assembly is provided between the first boost section and the second boost section for offsetting the axial force that has not been offset between the first boost section and the second boost section. The balancing assembly adopts water sealing. The balancing assembly includes a bearing member 9 fixedly mounted on the pump shaft 2 and two moving rings 8. The bearing member 9 is located between the two moving rings 8. The bearing member 9 is located between the partition plate 6 and the pump shaft 2. The bearing member 9 includes two forward-mounted tapered roller bearings. The inner rings of the two tapered roller bearings are fixedly connected to each other and are both fixedly mounted on the pump shaft 2. On the one hand, it ensures the rotational connection between the pump shaft 2 and the partition plate 6. On the other hand, the axial force is offset by the two forward-mounted tapered roller bearings.

[0029] The two static rings 7 are located between the two dynamic rings 8, and the static rings 7 are in close contact with the corresponding dynamic rings 8 on the opposite side. The static rings 7 and the corresponding dynamic rings 8 on the opposite side are both set in a stepped shape and match each other. Figure 3 As shown, annular protrusions are provided on the outer ends of the two static rings 7 on the opposite sides, and awakening grooves are provided on the opposite sides of the two dynamic rings 8. The annular protrusions match the corresponding annular grooves. On the one hand, the two dynamic rings 8 cooperate with the two static rings 7 to offset the axial force generated when the drainage pump is working.

[0030] The inner side of the partition plate 6 is provided with an annular groove 11. Figure 3-4 As shown, the cross-section of the annular groove 11 is V-shaped, and the two side walls of the annular groove 11 are respectively connected to the rollers of two tapered roller bearings 8 to form the outer ring structure of two tapered roller bearings, and then the rotational connection between the pump shaft 2 and the partition plate 6 is realized by the rolling cooperation between the rollers and the side walls of the annular groove 11, and the axial force of the pump shaft 2 is offset by the rollers connected to the inner wall of the annular groove 11.

[0031] Cylinders 12 are fixedly provided at both ends of the partition plate 6 . The end surface of the cylinder 12 away from the partition plate 6 contacts the end surface of the corresponding impeller 5 , and the impeller 5 close to the partition plate 6 is limited by the cylinder 12 .

[0032] like Figure 5-6 The figure shows the flow direction of water in the drainage pump booster of the present invention.

[0033] During use, as the impeller 5 rotates, that is, the water flow is pressurized and transported, most of the axial forces generated by the first boosting section and the second boosting section offset each other, and the remaining part is offset by the cooperation of the two dynamic rings 8 and the two static rings 7, and is offset again by the cooperation of the forward-mounted tapered roller bearings and the partition plate 6 (that is, the partition plate 6 fixedly connected to the housing 1), effectively avoiding the generation of axial force, extending the service life of the drainage pump, and reducing the failure rate.

[0034] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A mining axial force self-balancing drainage pump, comprising a housing (1) and a pump shaft (2) arranged axially along the housing (1), wherein the housing (1) is provided with a suction port (3) and a discharge port (4), and the pump shaft (2) is provided with a first boosting section and a second boosting section, wherein the first boosting section and the second boosting section are both composed of a plurality of impellers (5) fixedly sleeved on the pump shaft (2), the number of impellers (5) of the first boosting section and the second boosting section are the same and are arranged in opposite directions, and the pump is characterized in that: An annular partition plate (6) is fixedly provided in the middle of the housing (1), the partition plate (6) separates the first boost section from the second boost section, and static rings (7) are fixedly provided at both ends of the inner side of the partition plate (6); A balancing assembly is provided between the first boosting section and the second boosting section, the balancing assembly comprising a bearing member (9) fixedly sleeved on the pump shaft (2) and two movable rings (8), the bearing member (9) being located between the two movable rings (8), the bearing member (9) being located between the partition plate (6) and the pump shaft (2), the bearing member (9) comprising two tapered roller bearings mounted in a forward direction, the inner rings of the two tapered roller bearings being fixedly connected to each other and both being fixedly sleeved on the pump shaft (2); The two static rings (7) are located between the two dynamic rings (8), and the static rings (7) are in close contact with the opposite side of the corresponding dynamic rings (8).

2. A mining axial force self-balancing drainage pump according to claim 1, characterized in that: The inlet end of the first boost section is connected to the suction port (3), and the outlet end is connected to the second boost section; the inlet end of the second boost section is connected to the first boost section, and the outlet end is connected to the discharge port (4).

3. The mining axial force self-balancing drainage pump according to claim 1, characterized in that: A delivery pipe (10) is provided outside the shell (1), one end of the delivery pipe (10) being connected to the outlet end of the first boosting section and the other end being connected to the inlet end of the second boosting section.

4. The mining axial force self-balancing drainage pump according to claim 1, characterized in that: The opposite sides of the static ring (7) and the corresponding dynamic ring (8) are both arranged in a stepped shape and match each other.

5. The mining axial force self-balancing drainage pump according to claim 1, characterized in that: An annular groove (11) is provided on the inner side of the partition plate (6), and the cross section of the annular groove (11) is V-shaped. The two side walls of the annular groove (11) are respectively connected to the rollers of the two tapered roller bearings to form the outer ring structure of the two tapered roller bearings.

6. The mining axial force self-balancing drainage pump according to claim 1, characterized in that: Cylinders (12) are fixedly provided at both ends of the partition plate (6), and the end surface of the cylinder (12) away from the partition plate (6) contacts the end surface of the corresponding impeller (5).

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