Liquid-cooled shielding water pump

Abstract

The liquid-cooled shielding water pump comprises a machine shell, a volute is installed on the machine shell, a motor and a front bearing seat are installed in the machine shell, a shielding cover is installed in the motor, and a flow guide groove is formed in the front bearing seat; a water inlet pipeline and a water outlet pipeline are arranged on the volute, and a water pump medium enters the gap of the shielding case through the diversion trench to cool the motor; a rotating shaft is further installed in the machine shell, the part, penetrating through the front bearing seat, of the rotating shaft extends into the volute, a through hole and an impeller are arranged on the rotating shaft, and the through hole is used for discharging a water pump medium in the machine shell to a suction inlet of the impeller. The air is discharged to the suction inlet of the impeller through the rotating shaft; a cooling channel does not need to be independently arranged, the space utilization rate of the water pump can be improved, and the advantages of good sealing performance and high heat dissipation efficiency are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of water pumps, and in particular to a liquid-cooled shielded water pump. Background Art

[0002] Water pumps are widely used in various fields, primarily for conveying or pressurizing liquids. Currently, typical shielded water pumps are equipped with a motor to drive an impeller, which generates centrifugal force to pump the liquid. However, prolonged operation of the motor can lead to localized overheating and damage. Therefore, water pumps are typically equipped with a heat sink to cool the motor.

[0003] Currently, the motor in a water pump is mostly cooled by air. However, this cooling structure takes up too much space in the water pump, which, on the one hand, leads to space constraints for other components, and on the other hand, increases the overall weight of the water pump. Based on this, some water pumps use liquid cooling to cool the motor in the water pump. Existing water pumps often require a dedicated pipe for conveying water flow. Although this can remove heat from the water pump, it also takes up additional space within the casing. Summary of the Invention

[0004] One of the objectives of the present application is to provide a liquid-cooled shielded water pump that can solve at least one of the defects in the above-mentioned background technology.

[0005] In order to achieve at least one of the above-mentioned purposes, the technical solution adopted in the present application is: a liquid-cooled shielded water pump, comprising a casing, a volute is installed on the casing, a motor and a front bearing seat are installed inside the casing, and the front bearing seat partially extends into the volute; a shield is installed inside the motor, and a guide groove is provided on the front bearing seat; an inlet pipe and an outlet pipe are provided on the volute, and the water pump medium enters the gap of the shield through the guide groove to cool the motor; a rotating shaft is also installed in the casing, and the rotating shaft passes through the front bearing seat and extends into the volute, a through hole is provided on the rotating shaft, and an impeller is installed on the rotating shaft, and the through hole is used to discharge the water pump medium in the casing to the suction port of the impeller.

[0006] Through the above-mentioned setting, when the water pump starts, the liquid in the volute can enter the stator-rotor gap in the casing through the guide groove, and cool the motor in the form of heat exchange. Compared with traditional air-cooled heat dissipation, liquid cooling can achieve better heat dissipation effect; the setting of the guide groove can also avoid the need to lay a separate cooling pipe in the water pump, thereby improving the space utilization of the water pump.

[0007] Preferably, an end cover is also installed on the casing, and a rear bearing seat coaxial with the front bearing seat is sealed and installed on the end cover, a front sliding bearing is installed in the front bearing seat, and a rear sliding bearing is installed in the rear bearing seat; the two ends of the rotating shaft are respectively paired with the front sliding bearing and the rear sliding bearing.

[0008] Preferably, the housing is provided with a first support tube, the end cap is provided with a second support tube, and the ends of the shield are welded to the first and second support tubes, respectively. This arrangement allows the shield to limit the flow range of the pump medium, improving the safety of the water pump. The shield cooperates with the first and second support tubes to provide isolation and protection.

[0009] Preferably, the front sliding bearing and the rear sliding bearing are both provided with a plurality of grooves for transmitting water pump medium. In this way, the water pump medium in the shielding cover can flow through the grooves to the two ends of the rotating shaft to more comprehensively cool the heat-generating components in the water pump.

[0010] Preferably, the impeller is provided with a balancing hole, which is in communication with the suction port of the impeller. This arrangement allows the water pump medium at the front sliding bearing to be transmitted to the suction port of the impeller through the balancing hole to balance the axial force of the rotor.

[0011] Preferably, sleeves are mounted on both ends of the rotating shaft. The sleeves have a T-shaped longitudinal cross-section. The sleeves at each end of the rotating shaft partially extend into the front and rear sliding bearings, respectively. The rotating shaft and sleeves have an interference fit and are prevented from rotating by an anti-rotation structure. With this arrangement, the rotating shaft can drive the sleeves to rotate synchronously with the anti-rotation structure, converting wear on the rotating shaft caused by the bearings into wear on the sleeves, further improving the safety of the rotating shaft.

[0012] Preferably, a limiting structure is provided between the front bearing seat and the front sliding bearing, and between the rear bearing seat and the rear sliding bearing, so as to ensure that relative rotation does not occur between the bearings and the bearing seats.

[0013] Preferably, the motor includes a rotor core and a stator core, wherein the rotor core is fixedly mounted to the rotating shaft, and the stator core is fixedly mounted to the inner wall of the housing. A shoulder is provided on one end of the rotating shaft near the front bearing seat, and cover plates are installed at both ends of the rotor core. The shoulder is used to position and seal the rotor core, and the cover plates are used to protect the rotor core. With this arrangement, the shoulder provides vertical upward support for the rotor core, preventing it from separating from the rotating shaft due to gravity. The cover plates installed at both ends of the rotor core reduce the chance of wear on the rotor core.

[0014] Preferably, the impeller is mounted to the rotating shaft via a key and a shaft head screw, the front bearing seat is provided with an annular groove, and the impeller is provided with an annular retaining ring that cooperates with the annular groove. In this arrangement, the annular groove and the annular retaining ring cooperate to form a labyrinth seal, thereby improving volumetric efficiency.

[0015] Preferably, a through hole is provided on the shaft head screw, one end of the through hole is connected to the through hole, and the other end is connected to the suction port of the impeller.

[0016] Compared with the prior art, the present invention has the following advantages: The water pump medium can flow into the housing through the guide groove on the front bearing seat, removing heat from the heat-generating components. The water pump medium in the housing can then be discharged from the housing through the rotating shaft or impeller, ensuring that subsequent water pump medium can continue to enter the housing for heat dissipation. This invention eliminates the need for a separate cooling channel, further improving the space utilization of the water pump, and has the advantages of good sealing and high heat dissipation efficiency.

[0017] In the present invention, the rotating shaft is installed by limiting the bearing and the sleeve, which effectively reduces the risk of rotating shaft wear; the shielding cover can be made thinner to ensure that the present invention has the advantages of reducing eddy current loss, improving the working efficiency of the water pump and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of the liquid-cooled shielded water pump in this application.

[0019] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at part A in the middle.

[0020] Figure 3 for Figure 1 Schematic diagram of the enlarged structure at part B in the middle.

[0021] Figure 4 This is a schematic structural diagram of the front bearing seat in this application.

[0022] Figure 5 This is a schematic diagram of the structure of the impeller in this application.

[0023] Figure 6 This is a schematic structural diagram of the front sliding bearing in this application.

[0024] Figure 7 This is a schematic diagram of the structure of the shaft sleeve in this application.

[0025] Figure 8 This is a schematic diagram of the structure of the rotating shaft in this application.

[0026] In the figure: 1. casing; 11. end cover; 100. front sliding bearing; 101. rear sliding bearing; 102. groove; 110. rear bearing seat; 2. volute; 21. water inlet pipe; 22. water outlet pipe; 200. sleeve; 201. keyway; 3. front bearing seat; 31. guide groove; 32. annular groove; 300. impeller; 301. balancing hole; 302. annular retaining ring; 4. rotating shaft; 41. through hole; 42. shoulder; 43. flat key; 400. shaft head screw; 401. through hole; 5. motor; 51. rotor core; 52. stator core; 53. shielding cover; 500. positioning hole; 501. anti-rotation pin; 510. cover plate; 600. first support cylinder; 601. second support cylinder. DETAILED DESCRIPTION

[0027] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0028] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, indicating the orientation and position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of this application.

[0029] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0030] The terms "comprises" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0031] One aspect of the present application provides a liquid-cooled shielded water pump, such as Figures 1-4As shown, one preferred embodiment includes a casing 1, with a volute 2 sealedly mounted at the bottom of the casing 1. A motor 5 and a front bearing seat 3 are mounted inside the casing 1. The front bearing seat 3 partially extends into the volute 2. The front bearing seat 3 is sealed and mounted between the casing 1 and the volute 2 through the sealing effect of the casing 1 and the volute 2. A shield 53 is mounted inside the motor 5, a guide groove 31 is provided on the front bearing seat 3, and a water inlet pipe 21 and a water outlet pipe 22 are provided on the volute 2. A rotating shaft 4 is mounted inside the motor 5, with a through hole 41 provided inside the rotating shaft 4. One end of the rotating shaft 4 extends into the volute 2, and an impeller 300 is mounted on the rotating shaft 4. The suction port of the impeller 300 is used to draw in the pump medium in the water inlet pipe 21. When the machine is running, the water pump medium in the volute 2 can enter the shielding cover 53 through the guide groove 31 to cool the heating parts of the motor 5; the water pump medium in the shielding cover 53 can be discharged into the water inlet pipe 21 through the through hole 41, completing the circulation of the water pump medium.

[0032] It should be noted that the water pump medium in this application can cool the heat-generating components in the water pump through liquid heat exchange.

[0033] It is understandable that the liquid cooling of this device can achieve better heat dissipation effect than the traditional air-cooled heat dissipation water pump; the provision of the guide groove 31 can also avoid laying a separate cooling pipe in the water pump, thereby improving the space utilization of the water pump.

[0034] Specifically, such as Figure 1 As shown, the housing 1 is sealed with an end cap 11, and a rear bearing seat 110 is sealed and mounted coaxially with the front bearing seat 3 on the end cap 11. The lower portion of the rear bearing seat 110 extends into the housing 1. Furthermore, a front sliding bearing 100 and a rear sliding bearing 101 are mounted within the front bearing seat 3 and the rear bearing seat 110, respectively. By pairing the ends of the rotating shaft 4 with the front sliding bearing 100 and the rear sliding bearing 101, the rotating shaft 4 can be radially limited.

[0035] It should be noted that the sealing between the casing 1 and the volute 2, and between the casing 1 and the end cover 11 in the present application is achieved through O-rings.

[0036] Further, such as Figure 1 、 Figure 5 and Figure 6As shown, to ensure that the pump medium can pass through the front and rear sliding bearings 100, 101 and reach the heat-generating areas for cooling, multiple grooves 102 are provided on the inner walls of each of the front and rear sliding bearings 100, 101. The grooves 102 allow the pump medium to directly contact the front sliding bearing 100 and the rotating shaft 4, improving heat dissipation efficiency. The pump medium near the front sliding bearing 100, driven by the rear pump medium, can pass through the grooves 102 and reach the impeller 300, cooling the components along its path. Furthermore, the impeller 300 is provided with a balancing hole 301, which communicates with the impeller's suction port. The pump medium enters the impeller's suction port through the balancing hole 301 to balance the axial force.

[0037] It is understood that when the water pump is running, the pressure on both sides of the impeller 300 is uneven, generating an axial thrust directed toward the suction port side of the impeller 300. The balancing hole 301 guides the high-pressure liquid above the impeller 300 toward the suction port of the impeller 300, thereby increasing the pressure difference on both sides, thereby reducing the axial force and alleviating the bearing load.

[0038] It should be noted that the rotating shaft 4 rotates at high speed during operation. If the rotating shaft 4 is directly attached to the front sliding bearing 100 and the rear sliding bearing 101, it is likely to wear out during long-term use, and the rotating shaft 4 needs to be replaced frequently to maintain normal operation of the water pump. However, since the rotating shaft 4 is relatively expensive and the operation of replacing the rotating shaft 4 is complicated, it will increase the economic and time costs of maintenance for users.

[0039] In view of the above situation, improvements have been made in some embodiments of this application, specifically as follows Figure 2 、 Figure 3 and Figure 7 As shown, sleeves 200 are installed at both ends of the shaft 4 to prevent direct contact between the shaft 4 and the bearings. The sleeves 200 have a T-shaped longitudinal cross-section. The sleeves 200 at each end of the shaft 4 partially form an interference fit with the sleeves 200 of the front and rear sliding bearings 100 and 101, respectively. The side ears of the sleeves 200 are used to axially limit the installation of the sleeves 200.

[0040] Specifically, such as Figure 7 and Figure 8 As shown, a flat key 43 is provided on the outer wall of the rotating shaft 4, and a keyway 201 is provided on the inner wall of the sleeve to ensure that the rotating shaft 4 can drive the sleeve 200 to rotate synchronously, converting the wear of the bearing on the rotating shaft 4 into the wear of the bearing on the sleeve 200, thereby achieving the purpose of reducing maintenance costs.

[0041] Furthermore, a limiting structure is provided between the front bearing seat 3 and the front sliding bearing 100, and between the rear bearing seat 110 and the rear sliding bearing 101, to ensure that the matching bearings and the bearing seats do not rotate relative to each other. Various limiting structures can meet the requirements of this application. Here, one limiting structure is described below, using the front bearing seat 3 and the front sliding bearing 100 as an example.

[0042] like Figure 2 As shown, positioning holes 500 are provided on the sides of the front bearing seat 3 and the front sliding bearing 100 at the same level. After aligning the positioning holes 500 on the front bearing seat 3 with the positioning holes 500 on the front sliding bearing 100, the anti-rotation pin 501 is inserted into the positioning holes 500 to secure the front bearing seat 3 to the front sliding bearing 100. The retaining structure of the rear bearing seat 110 and the rear sliding bearing 101 is the same as above.

[0043] It is understandable that the provision of the limiting structure can ensure that relative rotation does not occur between the bearing and the bearing seat, thereby preventing the bearing seat from being worn and further reducing the maintenance cost of the water pump.

[0044] In this embodiment, if Figure 1 and Figure 3 As shown, the motor 5 includes a rotor core 51 and a stator core 52 . The rotor core 51 is fixedly mounted on the rotating shaft 4 , and the stator core 52 is fixedly mounted on the inner wall of the casing 1 .

[0045] Further, such as Figure 2 and Figure 8 As shown, a shoulder 42 is provided on one end of the rotating shaft 4 near the front bearing seat 3, and cover plates 510 are installed at both ends of the rotor core 51, with one cover plate 510 located between the rotor core 51 and the shoulder 42. When the rotor core 51 is plugged into the rotating shaft 4, the shoulder 42 provides a positioning seal for the stator core 52, while the cover plates 510 located at both ends of the rotor core 51 are used to protect the rotor core 51.

[0046] In this embodiment, if Figure 1 As shown, a first support cylinder 600 is provided on the casing 1, and a second support cylinder 601 is provided on the end cover 11. The two ends of the shielding cover 53 are respectively welded to the first support cylinder 600 and the second support cylinder 601 to ensure that the water pump medium is confined within the shielding cover 53, further improving the safety of the water pump. The shielding cover 53 in this application can play an isolation and protection role.

[0047] It can be understood that the first support tube 600 and the second support tube 601 can provide more stable support for the shielding cover 53. Therefore, in some embodiments of the present application, the thickness of the shielding cover 53 can be made thinner, thereby reducing eddy current loss and improving the working efficiency of the water pump.

[0048] In this embodiment, if Figure 2 As shown, the water inlet pipe 21 and the suction port of the impeller 300 are connected, and the impeller 300 and the rotating shaft 4 are installed by the shaft head screw 400. When the impeller 300 rotates with the rotating shaft 4, the water pump medium can be pressurized by centrifugation, ensuring that the water pump medium in the volute 2 can overcome the gravity factor and enter the casing 1.

[0049] Specifically, a mutually cooperating limiting structure is provided between the rotating shaft 4 and the impeller 300 , and the specific limiting method includes but is not limited to the limiting cooperation of the limiting block and the limiting groove to ensure that the impeller 300 can rotate synchronously with the rotating shaft 4 .

[0050] Further, such as Figure 2 、 Figure 4 and Figure 5 As shown, an annular groove 32 is provided on the front bearing seat 3, and an annular retaining ring 302 is provided on the impeller 300 to cooperate with the annular groove 32. The annular retaining ring 302 is extended into the annular groove 32 to form a labyrinth seal and throttle the water pump medium, thereby improving the volumetric efficiency of the water pump.

[0051] In this embodiment, if Figure 2 As shown, in order to allow the water pump medium in the through hole 41 to be discharged from the rotating shaft 4, a through hole 401 is provided on the shaft head screw 400, which is connected to the through hole 41 and the water inlet pipe 21, so that the water pump medium in the rotating shaft 4 can be discharged into the suction port of the impeller 300.

[0052] The above describes the basic principles, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments. The above-described embodiments and the specification merely illustrate the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A liquid-cooled shielded water pump, comprising a housing (1), characterized in that: A volute (2) is mounted on the casing (1), a motor (5) and a front bearing seat (3) are mounted inside the casing (1), and the front bearing seat (3) partially extends into the volute (2); a shielding cover (53) is mounted inside the motor (5), and a guide groove (31) is provided on the front bearing seat (3); a water inlet pipe (21) and a water outlet pipe (22) are provided on the volute (2), and a water pump medium enters the gap of the shielding cover (53) through the guide groove (31) to cool the motor (5); a rotating shaft (4) is also mounted in the casing (1), and the rotating shaft (4) passes through the front bearing seat (3) and partially extends into the volute (2); a through hole (41) is provided on the rotating shaft (4), and an impeller (300) is mounted on the rotating shaft (4), and the through hole (41) is used to discharge the water pump medium in the casing (1) to the suction port of the impeller (300).

2. The liquid-cooled shielded water pump according to claim 1, characterized in that: The housing (1) is further provided with an end cover (11), and a rear bearing seat (110) coaxial with the front bearing seat (3) is sealed and installed on the end cover (11), a front sliding bearing (100) is installed in the front bearing seat (3), and a rear sliding bearing (101) is installed in the rear bearing seat (110); and both ends of the rotating shaft (4) are paired with the front sliding bearing (100) and the rear sliding bearing (101), respectively.

3. The liquid-cooled canned water pump according to claim 2, characterized in that: A first supporting tube (600) is provided on the housing (1), a second supporting tube (601) is provided on the end cover (11), and both ends of the shielding cover (53) are welded to the first supporting tube (600) and the second supporting tube (601), respectively.

4. The liquid-cooled canned water pump according to claim 2, characterized in that: The front sliding bearing (100) and the rear sliding bearing (101) are both provided with a plurality of grooves (102) for transmitting water pump medium.

5. The liquid-cooled canned water pump according to claim 4, characterized in that: The impeller (300) is provided with a balancing hole (301), and the balancing hole (301) is in communication with the suction port of the impeller (300).

6. The liquid-cooled canned water pump according to claim 5, characterized in that: Both ends of the rotating shaft (4) are provided with shaft sleeves (200), the longitudinal section of the shaft sleeves (200) being in a "T" shape, the shaft sleeves (200) at both ends of the rotating shaft (4) partially extending into the front sliding bearing (100) and the rear sliding bearing (101), respectively, and the rotating shaft (4) and the shaft sleeves (200) are interference fit and are prevented from rotating by an anti-rotation structure.

7. The liquid-cooled canned water pump according to claim 6, characterized in that: A limiting structure is provided between the front bearing seat (3) and the front sliding bearing (100), and between the rear bearing seat (110) and the rear sliding bearing (101).

8. The liquid-cooled canned water pump according to claim 1, characterized in that: The motor (5) includes a rotor core (51) and a stator core (52), wherein the rotor core (51) is fixedly mounted on the rotating shaft (4), and the stator core (52) is fixedly mounted on the inner wall of the housing (1); a shaft shoulder (42) is provided on one end of the rotating shaft (4) close to the front bearing seat (3), and cover plates (510) are installed at both ends of the rotor core (51), wherein the shaft shoulder (42) is used to provide a positioning seal for the rotor core (51), and the cover plates (510) are used to protect the rotor core (51).

9. The liquid-cooled canned water pump according to claim 1, characterized in that: The impeller (300) and the rotating shaft (4) are mounted via a key and a shaft head screw (400); an annular groove (32) is provided on the front bearing seat (3); and an annular retaining ring (302) is provided on the impeller (300) and matches the annular groove (32).

10. The liquid-cooled canned water pump according to claim 9, characterized in that: The shaft head screw (400) is provided with a through hole (401), one end of the through hole (401) is connected to the through hole (41), and the other end is connected to the suction port of the impeller (300).

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