Rotor motor and electronic water pump using same

Abstract

The utility model relates to a rotor motor and an electronic water pump using the same, and solves the problems that a rotor assembly in the prior art is complex in production process, high in cost and easy to crack, a bearing on a water pump is easy to generate dry friction and the like. The water lubrication structure is arranged on the rotor and used for absorbing stress generated by expansion caused by heat and contraction caused by cold of the rotor to prevent the rotor from being broken, and the water lubrication structure is arranged on a thrust bearing and a radial bearing on the electronic water pump and used for providing water lubrication for the abutting fit face of the thrust bearing and the radial bearing. The motor has the advantages that the added shaft sleeve is made of the material with the thermal expansion coefficient close to that of the rotor, stress generated by thermal expansion and cold contraction of the rotor caused by cold and heated is absorbed through the shaft sleeve, the rotor is prevented from being broken, the use reliability of the motor is improved, the shutdown maintenance probability is reduced, the production and processing technology is simple, and the production and processing cost of the motor is easily controlled; in addition, a water lubrication structure is improved, and the lubrication effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of motors and pumps, in particular to a rotor motor and a pump using the same. Background Art

[0002] With the popularity of electronic water pumps, stainless steel centrifugal pumps in various industries have been replaced by electronic water pumps in many occasions, such as cooling water pumps in the laser chiller industry. Laser chillers have relatively high performance requirements for cooling water pumps, specifically, they have high requirements for the rotor motor in the cooling water pump. In addition, the current chiller industry has increasingly high requirements for low costs, and the requirements for water pump efficiency and reliability are also higher as the industry develops towards high-end. The existing rotor is usually composed of a stainless steel pump cover and a ferrite rotor. During the production process, it is necessary to cover the stainless steel sleeve to prevent the ferrite from cracking due to injection molding pressure. The production process is complex and costly, and it is difficult to meet the requirements of the chiller. If the rotor is directly injected with plastic magnetic material, incompatibility occurs due to the different thermal expansion coefficients of the ceramic shaft and the plastic magnetic material. The plastic magnetic material is prone to cracking after injection molding, resulting in the water pump performance being difficult to meet the requirements of the chiller. Summary of the invention

[0003] The purpose of the utility model is to solve the above-mentioned problems existing in the prior art and to provide a rotor motor and an electronic water pump using the same. A shaft sleeve is added to the rotating shaft, and a shaft sleeve with a thermal expansion coefficient close to that of the rotor is adopted. The bearing has elastic buffering capacity. The stress generated by thermal expansion and contraction of the rotor when it is cooled or heated is absorbed by the shaft sleeve, thereby preventing the rotor from breaking, improving the reliability of the motor, reducing the probability of shutdown for maintenance, and the production and processing technology is simple, which is conducive to controlling the production and processing cost of the motor. In addition, the water lubrication structure on the thrust bearing and the radial bearing on the electronic water pump is improved to improve the water lubrication effect of the pressure fitting surface of the thrust bearing and the radial bearing, prevent dry grinding, and increase the service life.

[0004] The above technical purpose of the utility model is mainly solved by the following technical solutions: a rotor motor, comprising a rotating shaft, a rotor sleeved on the rotating shaft, characterized in that a sleeve is provided on the rotating shaft, the sleeve is arranged between the rotating shaft and the rotor, and the sleeve is used to absorb the stress generated by the thermal expansion and contraction of the rotor to prevent the rotor from breaking. A sleeve is added to the rotating shaft, and a sleeve with a thermal expansion coefficient close to that of the rotor is used, and the bearing has an elastic buffering capacity, and the sleeve absorbs the stress generated by the thermal expansion and contraction of the rotor when it is cold or heated, thereby preventing the rotor from breaking, improving the reliability of the motor, and reducing the probability of downtime for maintenance, and the production and processing technology is simple, which is conducive to controlling the production and processing costs of the motor.

[0005] As a further improvement and supplement to the above technical solution, the utility model adopts the following technical measures: the rotor is a plastic magnetic rotor, the sleeve is a plastic sleeve, the sleeve is formed on the shaft, and the rotor is molded on the sleeve. The sleeve and the rotor are sequentially injection molded on the shaft, and the sleeve maintains its shape and does not melt during the rotor molding process. The rotor is a plastic magnetic rotor, which avoids the operation process of covering the stainless steel sleeve to prevent cracking when using ferrite magnets, which is conducive to simplifying the production and processing process, and saves material costs and process costs under the premise of meeting the same performance requirements. Due to the provision of a sleeve with elastic buffering capacity, the sleeve absorbs the stress generated by the thermal expansion and contraction of the rotor when the rotor is installed on the shaft, avoiding the situation that the plastic magnetic rotor is easily cracked due to the internal stress generated when the plastic magnetic rotor is directly installed on the shaft (the reason is that the rotor and the shaft are easily cracked due to the difference in thermal expansion coefficients between the materials (during mold molding and cooling, the ceramic shaft used in the shaft has only micron-level thermal expansion, while the expansion of the plastic magnetic rotor reaches more than 1 thread)). The sleeve is preferably made of an elastic buffer material, such as PA66 material (also known as nylon 66, which is a thermoplastic resin material).

[0006] Preferably, the shaft is at least one of a metal shaft, a ceramic shaft, and a metal-ceramic composite shaft. In practical applications, a ceramic shaft with high hardness and wear resistance is preferred.

[0007] Preferably, at least one embedded groove is provided on the rotating shaft, and after the sleeve is formed on the rotating shaft, the inner wall of the sleeve has a protruding first limiting body, and the first limiting body is filled in the embedded groove to form an axial stop and circumferential stop fit. The cooperation between the first limiting body and the embedded groove is conducive to limiting the circumferential rotation and radial movement of the sleeve along the rotating shaft.

[0008] Preferably, the outer wall of the sleeve is provided with at least one anti-rotation limiting structure, the rotor is formed to cover the anti-rotation limiting structure, the inner wall of the rotor has a second limiting body, and the second limiting body cooperates with the anti-rotation limiting structure to stop the sleeve and the rotor from rotating. The anti-rotation limiting structure can be a convex strip, a plurality of convex points, or a groove, a plurality of recesses, etc., and the second limiting body can be a concave strip, a recess, a convex strip or a convex point.

[0009] Preferably, the anti-rotation limit structure is in the shape of an elongated strip, there are at least two anti-rotation limit structures, the anti-rotation limit structures are axially symmetrically distributed, and the axis of the outer cylindrical surface of the rotor is coaxial with the axis of the rotating shaft.

[0010] Preferably, the radial thickness b of the second limiter is 0.3-1 mm, which can avoid the occurrence of injection molding defects such as incomplete plastic magnets due to poor fluidity during the formation of rotor plastic magnets (when the thickness is greater than 1 mm, the plastic magnets may not be fully fluid due to the excessively deep slots), and is conducive to forming a full and uniform plastic magnet rotor, thereby avoiding stress concentration and further improving motor performance.

[0011] The technical solution of the second technical theme involved in the utility model is: an electronic water pump, including a motor and a pump body matched with the motor, characterized in that the motor is the aforementioned rotor motor, and the rotor motor drives the pump body to work. A motor with a sleeve having a thermal expansion coefficient close to that of the rotor is used to prevent the rotor from breaking, improve the reliability of the motor, reduce the probability of downtime for maintenance, and thus increase the service life of the electronic water pump and reduce the probability of downtime for maintenance. In addition, the addition of the sleeve is conducive to simplifying the production and processing technology of the rotor, which is conducive to controlling the production and processing costs of the motor, and thus is conducive to controlling the production and processing costs of the electronic water pump.

[0012] A radial bearing is arranged on the pump cover of the pump body, a thrust bearing is arranged between the pump cover and the motor, one end of the thrust bearing is pressed against the radial bearing, the output end of the rotating shaft passes through the axial holes of the thrust bearing and the radial bearing in turn and extends into the pump body to cooperate with the impeller in the pump body, and a water lubrication structure is arranged on the thrust bearing and the radial bearing, and the water lubrication structure is used to provide water lubrication to the pressure fitting surfaces of the thrust bearing and the radial bearing. The water lubrication structure on the thrust bearing and the radial bearing on the electronic water pump is improved to improve the water lubrication effect of the pressure fitting surfaces of the thrust bearing and the radial bearing, prevent dry grinding, and increase the service life.

[0013] Preferably, the water lubrication structure includes at least three radial lubrication grooves arranged on the pressure surface of the thrust bearing, and an axial through hole arranged on the thrust bearing, one end of the axial through hole is connected to the inner cavity of the pump body, and the other end is connected to the lubrication groove, so that the water in the inner cavity of the pump body flows to the pressure fitting surface through the axial through hole and the lubrication groove. This technical solution increases the number of lubrication grooves and the axial through hole, so that more liquid in the pump body can flow into the pressure fitting surface of the thrust bearing and the radial bearing, thereby ensuring that there is enough liquid on the pressure fitting surface to form a full water lubrication surface, ensuring the lubrication effect and preventing dry grinding.

[0014] The utility model has the following beneficial effects: 1. A shaft sleeve is added to the rotating shaft, and a shaft sleeve with a thermal expansion coefficient close to that of the rotor is used, and the bearing has an elastic buffering capacity. The stress caused by thermal expansion and contraction of the rotor due to heating and cooling is absorbed by the added shaft sleeve, thereby preventing the rotor from breaking, improving the reliability of the motor, and reducing the probability of downtime for maintenance. In addition, the production and processing technology is simple, which is conducive to controlling the production and processing cost of the motor. 2. The use of the shaft sleeve simplifies the production and processing technology of the rotor, reduces the production and processing cost of the motor, and further reduces the production and processing cost of the electronic water pump. 3. The water lubrication structure on the thrust bearing and radial bearing on the electronic water pump is improved to improve the water lubrication effect of the pressure-fitting surface of the thrust bearing and radial bearing, prevent dry grinding, and increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a part of the structural coordination of the rotor motor involved in the utility model.

[0016] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along the AA direction.

[0017] Figure 3 yes Figure 1 Schematic diagram of the explosion structure.

[0018] Figure 4 yes Figure 3 A schematic diagram of the front view structure of a radial bearing in FIG.

[0019] Figure 5 yes Figure 3 A schematic diagram of the front view structure of the thrust bearing in FIG.

[0020] In the figure: 1. rotating shaft; 2. bushing; 3. rotor; 4. embedded groove; 5. first limit body; 6. anti-rotation limit structure; 7. second limit body; 8. pump cover; 9. impeller; 10. radial bearing; 11. thrust bearing; 12. lubrication groove; 13. axial through hole; 14. rubber sleeve; 15. graphite. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0022] Example 1: Figure 1-5As shown, a rotor motor comprises a rotating shaft 1 and a rotor 3 sleeved on the rotating shaft 1, characterized in that a sleeve 2 is provided on the rotating shaft 1, the sleeve 2 is arranged between the rotating shaft 1 and the rotor 3, and the sleeve 2 is used to absorb the stress generated by the thermal expansion and contraction of the rotor 3 to prevent the rotor 3 from breaking. A sleeve 2 is added to the rotating shaft 1, and a sleeve 2 with a thermal expansion coefficient close to that of the rotor 3 is used, and the bearing has elastic buffering capacity, and the sleeve 2 absorbs the stress generated by the thermal expansion and contraction of the rotor 3 when it is cold or heated, thereby preventing the rotor 3 from breaking, improving the reliability of the motor, reducing the probability of downtime for maintenance, and the production and processing technology is simple, which is conducive to controlling the production and processing cost of the motor.

[0023] In practical applications, the rotor 3 is a plastic magnetic rotor 3, the sleeve 2 is a plastic sleeve, the sleeve 2 is formed on the shaft 1, and the rotor 3 is molded on the sleeve 2. The sleeve 2 and the rotor 3 are sequentially injection molded on the shaft 1, and the sleeve 2 maintains its shape and does not melt during the molding process of the rotor 3. The rotor 3 is a plastic magnetic rotor 3, which avoids the operation process of covering the stainless steel sleeve to prevent cracking when using ferrite magnets, which is conducive to simplifying the production and processing process, and saves material costs and process costs under the premise of meeting the same performance requirements. Since the sleeve 2 with elastic buffering capacity is provided, the sleeve 2 absorbs the stress generated by the thermal expansion and contraction of the rotor 3 when the rotor 3 is installed on the shaft 1, and avoids the internal stress that is easy to generate when the plastic magnetic rotor 3 is directly installed on the shaft 1 (the reason is: the rotor 3 and the shaft 1 have a difference in thermal expansion coefficient between the materials (during mold molding and cooling, the ceramic shaft used in the shaft 1 has only micron-level thermal expansion, while the expansion of the plastic magnetic rotor 3 reaches more than 1 thread)) and makes the whole easy to crack. The sleeve 2 is preferably made of an elastic buffer material, such as PA66 material (also known as nylon 66, which is a thermoplastic resin material).

[0024] In practical applications, the shaft 1 is at least one of a metal shaft, a ceramic shaft, and a metal-ceramic composite shaft. In practical applications, a ceramic shaft with high hardness and wear resistance is preferred, which has lower cost and better reliability than a metal shaft while meeting the size requirements.

[0025] In practical applications, at least one embedded groove 4 is provided on the rotating shaft 1. After the sleeve 2 is formed on the rotating shaft 1, the inner wall of the sleeve 2 has a protruding first stopper 5, and the first stopper 5 is filled in the embedded groove 4 to form an axial stop and circumferential stop fit. The fit between the first stopper 5 and the embedded groove 4 is conducive to limiting the circumferential rotation and radial movement of the sleeve 2 along the rotating shaft 1.

[0026] In practical applications, the outer wall of the sleeve 2 is provided with at least one anti-rotation limiting structure 6, the rotor 3 is formed to cover the anti-rotation limiting structure 6, and the inner wall of the rotor 3 has a second limiting body 7, and the second limiting body 7 cooperates with the anti-rotation limiting structure 6 to stop the sleeve 2 and the rotor 3. The anti-rotation limiting structure 6 can be a convex strip, a plurality of convex points, or a groove, a plurality of recesses, etc., and the second limiting body 7 can be a concave strip, a recess, a convex strip or a convex point.

[0027] In practical applications, the stop-rotation limit structure 6 is in the shape of an elongated strip, there are at least two stop-rotation limit structures 6 , the stop-rotation limit structures 6 are axially symmetrically distributed, and the axis of the outer cylindrical surface of the rotor 3 is coaxial with the axis of the rotating shaft 1 .

[0028] In practical applications, the radial thickness b of the second limiter 7 is 0.3-1 mm, which can avoid the occurrence of injection defects such as incomplete plastic magnets due to poor fluidity when the plastic magnets of the rotor 3 are formed (when the thickness is greater than 1 mm, the plastic magnets may not be fully formed due to the excessive depth of the slots), and is conducive to forming a full and uniform plastic magnet rotor 3, thereby avoiding stress concentration and further improving motor performance.

[0029] In practical applications, during the cooling process of the plastic magnetic rotor 3 after molding, the provision of the embedded groove 4 and the anti-rotation limiting structure 6 is conducive to the plastic magnetic rotor 3 being able to generate a buffering effect through the shaft sleeve 2, and also to release internal stress to prevent cracking. At the same time, the plastic magnetic rotor 3 and the shaft sleeve 2 are restricted by the embedded groove 4 and the anti-rotation limiting structure 6 during use to prevent relative displacement, which is conducive to improving the performance of the motor.

[0030] Embodiment 2: is the technical solution of the second technical subject involved in the utility model, which is: an electronic water pump, including a motor and a pump body matched with the motor. The motor described in this technical solution is the rotor motor described in embodiment 1, and the rotor motor drives the pump body to work.

[0031] This technical solution uses a motor with a sleeve 2 having a thermal expansion coefficient close to that of the rotor 3, thereby preventing the rotor 3 from breaking, improving the reliability of the motor, reducing the probability of downtime for maintenance, and thus increasing the service life of the electronic water pump and reducing the probability of downtime for maintenance. In addition, the addition of the sleeve 2 is conducive to simplifying the production and processing technology of the rotor 3, which is conducive to controlling the production and processing costs of the motor, and thus is conducive to controlling the production and processing costs of the electronic water pump.

[0032] In practical applications, a radial bearing 10 is provided on the pump cover 8 of the pump body, a thrust bearing 11 is provided between the pump cover 8 and the motor, one end of the thrust bearing 11 is pressed against the radial bearing 10, the output end of the rotating shaft 1 passes through the axial holes of the thrust bearing 11 and the radial bearing 10 in turn and extends into the pump body to cooperate with the impeller 9 in the pump body, and a water lubrication structure is provided on the thrust bearing 11 and the radial bearing 10, and the water lubrication structure is used to provide water lubrication for the pressure-matching surfaces of the thrust bearing 11 and the radial bearing 10. The water lubrication structure is improved on the thrust bearing 11 and the radial bearing 10 on the electronic water pump to improve the water lubrication effect of the pressure-matching surfaces of the thrust bearing 11 and the radial bearing 10, prevent dry grinding, and increase the service life.

[0033] In practical applications, the water lubrication structure includes at least a radial lubrication groove 12 provided on the pressure surface of the thrust bearing 11, and an axial through hole 13 provided on the thrust bearing 11. One end of the axial through hole 13 is connected to the inner cavity of the pump body, and the other end is connected to the lubrication groove 12, so that the water in the inner cavity of the pump body flows to the pressure fitting surface through the axial through hole 13 and the lubrication groove 12. This technical solution increases the number of lubrication grooves 12 and the axial through hole 13, so that more liquid in the pump body can flow into the pressure fitting surface of the thrust bearing 11 and the radial bearing 10, thereby ensuring that there is enough liquid on the pressure fitting surface to form a full water lubrication surface, ensuring the lubrication effect and preventing dry grinding.

[0034] In this embodiment, the lubricating grooves 12 are preferably four symmetrically distributed radially arranged lubricating grooves 12 , and there are two axial through holes 13 , which are axially symmetrically distributed, and each axial through hole is connected to a corresponding lubricating groove 12 .

[0035] In practical applications, when the electronic water pump involved in the technical solution is applied to a dedicated pump for a chiller, the thrust bearing 11 is preferably in the form of a rubber sleeve 14 coated with graphite 15, and the graphite 15 on the side of the thrust bearing 11 that abuts against the radial bearing 10 is exposed from the rubber sleeve 14.

[0036] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. In the above embodiments, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A rotor motor, comprising a rotating shaft (1), a rotor (3) sleeved on the rotating shaft (1), characterized in that The shaft (1) is provided with a shaft sleeve (2), the shaft sleeve (2) being arranged between the shaft (1) and the rotor (3), and the shaft sleeve (2) being used to absorb stress generated by thermal expansion and contraction of the rotor (3) to prevent the rotor (3) from breaking.

2. The rotor motor according to claim 1, characterized in that The rotor (3) is a plastic magnetic rotor (3), the shaft sleeve (2) is a plastic sleeve, the shaft sleeve (2) is formed on the rotating shaft (1), and the rotor (3) is molded on the shaft sleeve (2).

3. The rotor motor according to claim 1, characterized in that The rotating shaft (1) is at least one of a metal rotating shaft, a ceramic rotating shaft, and a metal-ceramic composite rotating shaft.

4. The rotor motor according to any one of claims 1 to 3, characterized in that At least one embedded groove (4) is provided on the rotating shaft (1); after the shaft sleeve (2) is formed on the rotating shaft (1), the inner wall of the shaft sleeve (2) has a protruding first limiting body (5); the first limiting body (5) is filled in the embedded groove (4) to form an axial stop and circumferential stop fit.

5. The rotor motor according to any one of claims 1 to 3, characterized in that The outer wall of the shaft sleeve (2) is provided with at least one anti-rotation limit structure (6), the rotor (3) is formed to cover the anti-rotation limit structure (6), and the inner wall of the rotor (3) has a second limit body (7), and the second limit body (7) cooperates with the anti-rotation limit structure (6) to stop the shaft sleeve (2) and the rotor (3) from rotating.

6. The rotor motor according to claim 5, characterized in that The anti-rotation limiting structure (6) is in the shape of an elongated strip. There are at least two anti-rotation limiting structures (6). The anti-rotation limiting structures (6) are axially symmetrically distributed. The axis of the outer cylindrical surface of the rotor (3) is coaxial with the axis of the rotating shaft (1).

7. The rotor motor according to claim 6, characterized in that The radial thickness b of the second limiting body (7) is 0.3-1 mm.

8. An electronic water pump, comprising a motor and a pump body matched with the motor, characterized in that The motor is a rotor motor according to any one of claims 1 to 7, and the rotor motor drives the pump body to operate.

9. The electronic water pump according to claim 8, characterized in that A radial bearing (10) is arranged on the pump cover (8) of the pump body, a thrust bearing (11) is arranged between the pump cover (8) and the motor, one end of the thrust bearing (11) is pressed against the radial bearing (10), the output end of the rotating shaft (1) passes through the axial holes of the thrust bearing (11) and the radial bearing (10) in sequence and extends into the pump body to cooperate with the impeller (9) in the pump body, and a water lubrication structure is arranged on the thrust bearing (11) and the radial bearing (10), and the water lubrication structure is used to provide water lubrication to the pressing fitting surfaces of the thrust bearing (11) and the radial bearing (10).

10. The electronic water pump according to claim 9, characterized in that The water lubrication structure comprises at least three radial lubrication grooves (12) arranged on the pressure surface of the thrust bearing (11), and an axial through hole (13) arranged on the thrust bearing (11); one end of the axial through hole (13) is connected to the inner cavity of the pump body, and the other end is connected to the lubrication groove (12), so that water in the inner cavity of the pump body flows to the pressure fitting surface through the axial through hole (13) and the lubrication groove (12).

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