CN217055610U

CN217055610U - Axial self-balancing water pump

Info

Publication number: CN217055610U
Application number: CN202220684918.2U
Authority: CN
Inventors: 郭义涛; 郭学文
Original assignee: Hunan Sanke Intelligent Equipment Co ltd
Current assignee: Hunan Sanke Intelligent Equipment Co ltd
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2022-07-26
Anticipated expiration: 2032-03-25

Abstract

The utility model provides an axial self-balancing water pump relates to fluid equipment technical field, include: casing, pump shaft, prime mover, impeller, inner ring component, outer ring component, slide bearing. The impeller can rotate to drive fluid to flow from the first side to the second side of the impeller in a pressurizing mode along the axial direction of the pump shaft. A first clearance passage for fluid to pass through is formed between the inner ring member and the outer ring member. The slide bearing is arranged on one side of the inner ring component far away from the impeller, and comprises: the bearing comprises a bearing bush fixed on the shell and a bearing inner ring which is arranged on the pump shaft and is matched with the bearing bush; a second gap channel for fluid to pass through is formed between the bearing bush and the bearing inner ring; a balance cavity is formed between the first clearance channel and the second clearance channel and is communicated with the first clearance channel. In this application, the pump shaft is in dynamic axial balance, need not the prime mover and bears axial load to avoid the prime mover to receive axial load's harmful effects, improved life.

Description

Axial self-balancing water pump

Technical Field

The application relates to the technical field of fluid equipment, in particular to an axial self-balancing water pump.

Background

A pump is a machine that delivers or pressurizes a fluid. In prior art, install the impeller on the pump shaft, and adopt motor drive, the axial force of traditional pump is undertaken by the motor bearing, can cause the motor to generate heat like this, causes unit efficiency to reduce, has improved equipment energy consumption, and leads to the motor bearing to damage easily, also can make motor coil insulating layer too early ageing simultaneously. This phenomenon is more pronounced the higher the working pressure of the pump.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application will be solved lies in, to prior art's the aforesaid not enough, provides an axial self-balancing water pump.

This axial self-balancing water pump includes:

a shell, on which a water inlet and a water outlet are arranged;

the pump shaft penetrates through the shell;

a prime mover having a drive shaft in powered communication with the pump shaft for driving rotation of the pump shaft;

an impeller mounted on the pump shaft; the impeller can rotate to drive fluid to flow from the first side to the second side of the impeller in a pressurizing mode along the axial direction of the pump shaft;

the inner ring component is positioned at the second side position of the impeller and is arranged on the pump shaft to synchronously rotate along with the pump shaft;

an outer ring member fixedly mounted on the housing, a first clearance passage for fluid to pass through being formed between the inner ring member and the outer ring member;

a sliding bearing provided on a side of the inner ring member away from the impeller, comprising: the bearing comprises a bearing bush fixed on the shell and a bearing inner ring which is arranged on the pump shaft and is matched with the bearing bush; a second clearance channel for fluid to pass through is formed between the bearing bush and the bearing inner ring; a balance cavity is formed between the first gap channel and the second gap channel and is communicated with the first gap channel;

when the bearing bush abuts against the inner ring member to form a contact seal to block the balance cavity and the second clearance passage during operation, pressurized high-pressure fluid can be injected into the balance cavity from the first clearance passage to promote the pump shaft to move in the first axial direction to enable the bearing bush to be separated from the inner ring member; when the bearing bush is separated from the inner ring member, the balance cavity is communicated with the second clearance channel, so that fluid in the balance cavity leaks, the fluid pressure in the balance cavity is reduced, the pump shaft moves along the second axial direction, and the bearing bush and the inner ring member reach a contact sealing state again.

In some embodiments, the inner ring member comprises: the pump comprises an inner ring part, an outer ring part and a connecting part, wherein the inner ring part is arranged on a pump shaft, the outer ring part is matched with the outer ring component to form a first gap channel, and the connecting part is used for connecting the inner ring part and the outer ring part; the bearing bush is abutted against the connecting part.

In some embodiments, the second clearance passage communicates with the water inlet of the housing.

In some embodiments, an axial position of the first clearance channel and an axial position of the second clearance channel at least partially overlap in a pump shaft axial direction.

In some embodiments, a plurality of circumferentially expanding cavities are arranged at intervals along the extending direction of the first clearance channel; the circumferentially expanding cavity is formed by an expansion of a separation distance between the inner ring member and the outer ring member.

In some embodiments, the outer ring member is provided with a plurality of groove structures for forming said circumferentially extending cavities.

In some embodiments, the axially self-balancing water pump is a vertical pump; the prime motor is arranged at the top of the shell, and the sliding bearing is arranged at the lower end of the pump shaft; the impeller is used for pressurizing fluid downwards along the pump shaft.

In some embodiments, the impeller is a multi-stage centrifugal pump impeller.

In some embodiments, the prime mover is an electric motor.

In some embodiments, a coupling is used between the output shaft of the motor and the pump shaft.

In this application, under the effect of fluid pressure, the dynamic switching between contact seal state or the break away from the state between axle bush and the interior ring member for the pump shaft is in dynamic axial balance, need not the prime mover and bears axial load, thereby avoids the prime mover to receive axial load's harmful effects, has improved life.

Drawings

Fig. 1 is a schematic structural diagram of an axial self-balancing water pump in an embodiment of the present application.

Fig. 2 is a partial structural schematic diagram of an axial self-balancing water pump in the embodiment of the present application.

Fig. 3 is another partial structural schematic diagram of an axially self-balancing water pump in the embodiment of the application.

Detailed Description

The following are specific embodiments of the present application and are further described with reference to the drawings, but the present application is not limited to these embodiments. In the following description, specific details such as specific configurations and components are provided only to help the embodiments of the present application be fully understood. Accordingly, it will be apparent to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

In addition, the embodiments and the features of the embodiments in the present application may be combined with each other without conflict.

Referring to fig. 1 to 3, an embodiment of the present application provides an axial self-balancing water pump, including: the pump includes a housing 10, a pump shaft 20, a prime mover 30, an impeller 40, an inner ring member 50, an outer ring member 60, and a sliding bearing 70. The prime mover 30 is an electric motor or an internal combustion engine. In some embodiments, the impeller 40 is a multi-stage centrifugal pump impeller.

The housing 10 is provided with a water inlet 11 and a water outlet 12. A pump shaft 20 is inserted into the housing 10. The prime mover 30 has a drive shaft 31, and the drive shaft 31 is in power communication with the pump shaft 20 to drive the pump shaft 20 to rotate. The impeller 40 is arranged on the pump shaft 20; the impeller 40 is configured to rotatably drive a pressurized flow of fluid axially along the pump shaft 20 from a first side to a second side of the impeller 40. The inner ring member 50 is located at a second side position of the impeller 40 and is mounted on the pump shaft 20 to rotate synchronously with the pump shaft 20. The outer ring member 60 is fixedly mounted on the housing 10, and a first gap passage 61 for passing a fluid is formed between the inner ring member 50 and the outer ring member 60. A slide bearing 70 is provided on a side of the inner ring member 50 remote from the impeller 40, and includes: a bearing bush 71 fixed on the housing 10, and a bearing inner ring 72 mounted on the pump shaft 20 and adapted to the bearing bush 71; a second clearance channel 73 for fluid to pass through is formed between the bearing bush 71 and the bearing inner ring 72; a balance chamber 51 is formed between the first clearance passage 61 and the second clearance passage 73, and the balance chamber 51 communicates with the first clearance passage 61.

Referring to fig. 1, the axial self-balancing water pump is a vertical multistage centrifugal pump, and is sequentially arranged along a pump shaft 20 from top to bottom: a motor, a multistage impeller 40, an inner ring member 50 and an outer ring member 60, a sliding bearing 70. A nut is installed at the bottom position of the sliding bearing 70. When the prime mover 30 drives the pump shaft 20 to rotate, the impeller 40 rotates with the pump shaft 20. When the impeller 40 rotates, the impeller 40 can rotate to drive the fluid to flow from a first side to a second side of the impeller 40 in a pressurizing manner along the axial direction of the pump shaft 20, wherein the first side is the upper side position of the impeller 40, and the second side is the lower side position of the impeller 40. The fluid at the upper side of the impeller 40 is not pressurized by the impeller 40 and is a low-pressure fluid. The fluid at the lower side of the impeller 40 is pressurized by the impeller 40 to be a high-pressure fluid.

In the embodiment of the application, the axial self-balancing water pump is a vertical pump; the prime mover 30 is arranged on the top of the housing 10, and the sliding bearing 70 is arranged at the lower end position of the pump shaft 20; the impeller 40 serves to pressurize fluid down the pump shaft 20. The first side of the impeller 40 is the upper side of the impeller 40, and the second side is the lower side of the impeller 40.

In the embodiment of the present application, power can be transmitted between the output shaft of the motor and the pump shaft 20, and the pump shaft 20 can move in a small range in the axial direction. In some embodiments, a coupling is used between the output shaft of the motor and the pump shaft 20.

In operation, when the bearing shoes 71 abut against the inner ring member 50 to form a contact seal to block the balance chamber 51 and the second clearance passage 73, pressurized high-pressure fluid can be injected into the balance chamber 51 from the first clearance passage 61 to urge the pump shaft 20 to move in the first axial direction to move the bearing shoes 71 out of contact with the inner ring member 50. When the bearing bush 71 is out of contact with the inner ring member 50, the balance cavity 51 is communicated with the second clearance channel 73, so that fluid in the balance cavity 51 leaks, the pressure of the fluid in the balance cavity 51 is reduced, the pump shaft 20 moves in the axial second direction, and the bearing bush 71 and the inner ring member 50 reach a contact sealing state again.

When the bearing shell 71 abuts on the inner ring member 50 to form a contact seal to block the balance chamber 51 and the second clearance passage 73, pressurized high-pressure fluid is injected into the balance chamber 51 through the first clearance passage 61, and at this time, the rotor of the entire pump shaft is configured to receive a resultant upward force to urge the entire rotor upward, so that the bearing shell 71 is out of contact with the inner ring member 50. After the bearing shell 71 is out of contact with the inner ring member 50, the balance chamber 51 communicates with the second clearance passage 73 to allow fluid in the balance chamber 51 to leak and thus the pressure of the fluid in the balance chamber 51 to decrease, so that the inner ring member 50 and the entire rotor portion receive an upward force from the balance chamber 51 to decrease, and at this time, the resultant force received by the rotor of the pump shaft is downward, so that the bearing shell 71 is again in contact with the inner ring member 50 and forms a contact seal. In this way, the whole rotor part of the pump is in a state of dynamic floating change of the axial position, and the motor is hardly subjected to axial load. Furthermore, the above process is still true as the rotational speed of the pump shaft 20 changes, and therefore the motor is almost unaffected by axial loads in all rotational speed modes of the pump.

In the embodiment of the present application, the bearing shell 71 is made of a polymer material, and the bearing inner ring 72 is made of a ceramic material. The bearing inner ring 72 is mounted on the pump shaft 20 and rotates relative to the bearing shell 71. Here, the bush 71 is made of a polymer material so that a good contact seal can be formed between the bush 71 and the inner ring member 50. The bearing inner ring 72 made of the ceramic material and the bearing bush 71 made of the high polymer material are matched to have a long service life. Here, the plain bearing serves as a radial support for the pump shaft and as a structure for forming an axial balance adjustment.

The high pressure fluid in the balance chamber 51 applies an upward force to the inner ring member 50 and the entire rotor portion, and the resultant force experienced by the entire rotor varies as the pressure in the balance chamber 51 varies. In some embodiments, inner ring member 50 comprises: an inner ring part 52 mounted on the pump shaft 20, an outer ring part 53 adapted to form a first clearance passage 61 with the outer ring member 60, and a connecting part 54 connecting the inner ring part 52 and the outer ring part 53; the bearing shell 71 abuts against the connecting portion 54.

Referring to fig. 1, after the bearing shell 71 is out of contact with the inner ring member 50, one end of the second clearance passage 73 communicates with the balance chamber 51 and the other end communicates with the low pressure chamber 13, so that the high pressure fluid in the balance chamber 51 is rapidly leaked and the fluid pressure is reduced. The second gap passage 73 communicates with the water inlet 11 of the housing 10. Specifically, the housing 10 is provided with a balance hole 14 to communicate the low pressure chamber 13 and the water inlet 11. During the pressure relief, the fluid in the balance chamber 51 firstly enters the low pressure chamber 13 through the second clearance channel 73, and then enters the water inlet end of the pump through the balance hole 14.

In some embodiments, the width of the first clearance channel 61, i.e. the clearance between the inner ring member 50 and the outer ring member 60, ranges from 0.05 to 0.1 mm.

Further, the axial position of the first clearance channel 61 and the axial position of the second clearance channel 73 at least partially overlap in the axial direction of the pump shaft 20. Thus, the first clearance passage 61, the balance chamber 51, and the second clearance passage 73 form a serpentine passage, thereby reducing the flow rate of the fluid and reducing the amount of leakage of the high-pressure fluid.

In some embodiments, a plurality of circumferentially expanding cavities 611 are arranged at intervals along the extending direction of the first clearance passage 61; the hoop expansion chamber 611 is formed by expanding a spacing distance between the inner ring member 50 and the outer ring member 60. The high-pressure fluid diffuses and flows into the annular expansion chamber 611 when entering the annular expansion chamber 611, and the high-pressure fluid needs to contract again when flowing out of the annular expansion chamber 611. The high-pressure fluid needs to be continuously diffused and contracted when passing through the annular expansion cavity 611, so that the flowing speed of the high-pressure fluid is delayed, and the leakage amount is reduced. The number of circumferentially expanding cavities 611 may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

Specifically, the outer ring member 60 is provided with a plurality of groove structures for forming the circumferentially expanding cavity 611. The circumferentially expanding cavity 611 is formed by a groove structure machined on the inner surface of the outer ring member 60.

In the embodiment of the application, under the action of fluid pressure, the bearing bush and the inner ring component are dynamically switched between a contact sealing state and a separation state, so that the pump shaft is in dynamic axial balance, the prime motor is not required to bear axial load, adverse effects of the axial load on the prime motor are avoided, and the service life is prolonged.

In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

In the description of the present application, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The specific embodiments described herein are merely illustrative of the spirit of the application. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the present application as defined by the appended claims.

Claims

1. An axial self-balancing water pump, comprising:

a shell (10) which is provided with a water inlet (11) and a water outlet (12);

a pump shaft (20) arranged in the housing (10) in a penetrating manner;

a prime mover (30) having a drive shaft (31), said drive shaft (31) being in powered communication with said pump shaft (20) for driving rotation of said pump shaft (20);

an impeller (40) mounted on the pump shaft (20); the impeller (40) can rotate to drive fluid to flow from the first side to the second side of the impeller (40) in a pressurizing mode along the axial direction of the pump shaft (20);

an inner ring member (50) which is positioned at the second side position of the impeller (40) and is arranged on the pump shaft (20) and synchronously rotates with the pump shaft (20);

an outer ring member (60) fixedly mounted on the housing (10), a first clearance passage (61) for passing a fluid being formed between the inner ring member (50) and the outer ring member (60);

a plain bearing (70) provided on a side of the inner ring member (50) remote from the impeller (40), comprising: the pump comprises a bearing bush (71) fixed on the shell (10) and a bearing inner ring (72) which is arranged on the pump shaft (20) and is matched with the bearing bush (71); a second clearance channel (73) for fluid to pass through is formed between the bearing bush (71) and the bearing inner ring (72); a balance cavity (51) is formed between the first clearance channel (61) and the second clearance channel (73), and the balance cavity (51) is communicated with the first clearance channel (61); when the bearing bush (71) abuts on the inner ring member (50) to form a contact seal to block the balance cavity (51) and the second clearance channel (73), pressurized high-pressure fluid can be injected into the balance cavity (51) from the first clearance channel (61) to enable the pump shaft (20) to move in the first axial direction to enable the bearing bush (71) to be separated from the contact with the inner ring member (50); when the bearing bush (71) is separated from contact with the inner ring member (50), the balance cavity (51) is communicated with the second clearance channel (73) to enable fluid in the balance cavity (51) to leak, so that fluid pressure in the balance cavity (51) is reduced, the pump shaft (20) moves in the second axial direction, and the bearing bush (71) and the inner ring member (50) achieve a contact sealing state again.

2. The axially self-balancing water pump of claim 1, wherein the inner ring member (50) comprises: an inner ring part (52) arranged on the pump shaft (20), an outer ring part (53) used for forming a first clearance channel (61) in a matching way with the outer ring component (60), and a connecting part (54) for connecting the inner ring part (52) and the outer ring part (53); the bearing shell (71) abuts against the connecting part (54).

3. Axially self-balancing water pump according to claim 1, characterized in that the second clearance channel (73) communicates with the water inlet (11) of the housing (10).

4. The axially self-balancing water pump of claim 1, wherein an axial position of the first clearance channel (61) and an axial position of the second clearance channel (73) at least partially overlap in an axial direction of the pump shaft (20).

5. The axially self-balancing water pump according to claim 1, characterized in that a plurality of circumferentially expanding cavities (611) are arranged at intervals along the extension direction of the first clearance channel (61); the hoop expansion chamber (611) is formed by an expansion of a spacing distance between the inner ring member (50) and the outer ring member (60).

6. The axially self-balancing water pump of claim 5, characterized in that the outer ring member (60) is provided with a plurality of groove structures for forming the circumferentially extending cavities (611).

7. The axially self-balancing water pump of claim 1, wherein the axially self-balancing water pump is a vertical pump; the prime mover (30) is arranged on the top of the shell (10), and the sliding bearing (70) is arranged at the lower end position of the pump shaft (20); the impeller (40) is used for pressurizing fluid down the pump shaft (20).

8. The axially self-balancing water pump of claim 1, wherein the impeller (40) is a multi-stage centrifugal pump impeller.

9. The axially self-balancing water pump of claim 1, wherein the prime mover (30) is an electric motor.

10. The axial self-balancing water pump according to claim 9, characterized in that the output shaft of the motor is coupled to the pump shaft (20).