Internal liquid cooling heat dissipation circulation structure of motor pump

Abstract

The utility model discloses an internal liquid cooling heat dissipation circulation structure of a motor pump, relates to the technical field of liquid pumps, and solves the problem of poor heat dissipation effect caused by the fact that heat dissipation of the motor pump mostly depends on an external heat dissipation mode in the prior art. The pump comprises a motor body and a pump body which are connected with each other, a motor main shaft is rotatably arranged in the motor body, a rotor assembly is arranged on the motor main shaft, the end portion of the motor main shaft extends into the pump body and is connected with a pumping gear arranged in the pump body, and an end face gap is formed between the end face of the pumping gear and the pump body. Liquid inlet flow channels are arranged between the end face of the motor main shaft and the pump body and inside the motor main shaft, and the liquid inlet flow channels are communicated with the end face gap. Liquid outlet flow channels are arranged between the rotor assembly and the motor body and between the outer wall of the motor main shaft and the pump body, and the liquid inlet flow channel and the liquid outlet flow channels are communicated in the motor body. When the motor pump works, a working medium part enters the motor body through the liquid inlet flow channel and flows out through the liquid outlet flow channel, loss of the working medium is avoided, heat in the motor body can be taken away, and the purpose of heat dissipation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid pumps, in particular to an internal liquid cooling and heat dissipation circulation structure of a motor pump. Background Art

[0002] A gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport or pressurize liquids. It consists of two gears, a pump body, and front and rear covers, forming two closed spaces. When the gears rotate, the volume of the space on the side where the gears disengage changes from small to large, creating a vacuum to suck in the liquid, and the volume of the space on the side where the gears mesh changes from large to small, squeezing the liquid into the pipeline. Most existing gear pumps are driven by motors. When the motor drives the gear pump, a large amount of heat is generated inside the motor. Under normal circumstances, this part of the heat can only be dissipated by contact transfer between the main shaft and the end cover, pump housing, etc., or by other external methods. The heat dissipation efficiency is low, and the overall heat dissipation performance is poor. This is also the main factor leading to defects such as the inability to increase the power of the pump, short service life of the pump, and poor stability.

[0003] Chinese Utility Model Patent Publication No. CN217036972U discloses a structure for liquid-cooling an electric motor using a rotor to drive a cycloidal gear pump, including: a heat dissipation housing, a cycloidal gear pump, an electric motor stator housing, an electric motor stator, an electric motor rotor, and an electric motor rotor shaft. The cycloidal gear pump is connected to the electric motor rotor shaft and can rotate concentrically. The heat dissipation housing covers the outside of the electric motor stator housing. The cycloidal gear pump is arranged on the top of the electric motor stator housing, and an O-ring seal is provided between them. The side of the electric motor stator housing is provided with a first inlet, and the top is provided with a first outlet. A spiral flow channel groove is provided on the circumferential outer wall of the electric motor stator housing, and the flow channel groove extends to the top heat dissipation area of the electric motor stator housing. The heat dissipation area is provided with an annular heat dissipation groove, and the flow channel groove is connected to the annular heat dissipation groove through a liquid flow channel. This utility model uses the electric motor rotor shaft to drive the cycloidal gear pump to work, and uses the liquid flow outside the electric motor stator housing to cool the electric motor stator, which can be used infinitely and has a good cooling effect. In this solution, external heat dissipation is also used for heat dissipation. When the heat inside the motor is concentrated or the working environment is a high-temperature environment, it is difficult to dissipate the heat at the rotor timely and sufficiently, or it is difficult to dissipate the heat to the outside world, resulting in poor heat dissipation effect. Summary of the Utility Model

[0004] Aiming at the deficiencies in the above background art, the utility model proposes an internal liquid cooling and heat dissipation circulation structure of a motor pump, which solves the problem of poor heat dissipation caused by most heat dissipation of the existing motor pump relying on external heat dissipation methods.

[0005] The technical solution of the utility model is realized as follows: An internal liquid cooling and heat dissipation circulation structure of a motor pump, which includes a motor body and a pump body connected to each other. A motor main shaft is rotatably arranged in the motor body, and a rotor assembly is arranged on the motor main shaft. The end of the motor main shaft extends into the pump body and is connected to a pumping gear arranged in the pump body. There is an end face gap between the end face of the pumping gear and the pump body. An inlet liquid flow channel is arranged between the end face of the motor main shaft and the pump body and inside the motor main shaft, and the inlet liquid flow channel is communicated with the end face gap; an outlet liquid flow channel is arranged between the rotor assembly and the motor body and between the outer wall of the motor main shaft and the pump body, and the inlet liquid flow channel and the outlet liquid flow channel are communicated inside the motor body.

[0006] Preferably, the pumping gear includes a driving gear and a driven gear that mesh with each other. An inner hole is arranged at the axis of the driving gear and the driving gear is sleeved on the motor main shaft through the inner hole. A keyway is arranged on the inner hole. A transverse through hole is arranged on the motor main shaft, and a pin shaft is arranged in the transverse through hole and the end of the pin shaft cooperates with the keyway to realize the fixation of the driving gear; the driven gear is rotatably arranged in the pump body, and the end face gap includes the gap between the driving gear and the pump body.

[0007] Preferably, the inlet liquid flow channel includes an end face cavity between the end face of the motor main shaft and the pump body, and the end face cavity is communicated with the gap between the upper end face of the driving gear and the pump body. An axial through hole is arranged on the motor main shaft, and both ends of the axial through hole are respectively communicated with the end face cavity and the outlet liquid flow channel; wear-resistant blocks are arranged on the pump body and are respectively matched with both ends of the driving gear and the driven gear.

[0008] Preferably, the motor body includes a motor housing. A shielding sleeve is arranged inside the motor housing. The shielding sleeve is connected to the pump body. The rotor assembly is arranged inside the shielding sleeve. A stator corresponding to the rotor assembly is arranged between the motor housing and the shielding sleeve.

[0009] Preferably, the rotor assembly includes a rotor fixedly arranged on the motor main shaft, and a rotor outer sleeve is arranged outside the rotor. Bearings I and II are respectively arranged on the motor main shaft on both sides of the rotor assembly. The motor main shaft is rotatably arranged in the shielding sleeve through bearings I and II.

[0010] Preferably, the outlet liquid flow channel includes a gap I between the end face of bearing I and the shielding sleeve, a gap II of bearing I itself, a gap III between the shielding sleeve and the rotor outer sleeve, a gap IV of bearing II itself, a gap V between the end face of bearing II and the pump body, and a gap VI between the motor main shaft and the pump body that are communicated to form a flow channel; and the inlet liquid flow channel is communicated with gap I.

[0011] Preferably, the pump body includes an upper cover plate, the upper cover plate is connected to the pump body, the pump body is connected to a lower cover plate, and an internal space for accommodating the pumping gear is arranged on the pump body.

[0012] Preferably, the pump body is provided with a liquid inlet and a liquid outlet, both of which are communicated with the internal space and are respectively located on both sides of the pumping gear. The liquid outlet flow channel is communicated with the internal space on one side close to the liquid outlet.

[0013] The beneficial effects of the present utility model: By providing a liquid inlet flow channel and a liquid outlet flow channel, it can be communicated with the pump body, so that when the motor pump works, part of the working medium enters the motor body through the liquid inlet flow channel and flows out through the liquid outlet flow channel. This not only does not cause loss of the working medium, but also can use the working medium to take away the internal heat of the motor body, forming an internal heat dissipation cycle. It not only realizes the purpose of dissipating heat inside the motor body, improves the heat dissipation effect, but also enables the motor pump with an internal liquid cooling heat dissipation cycle structure to have a wider application range, especially suitable for high-temperature environments, with a simple structure, good heat dissipation effect, and strong durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for description in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 It is a schematic cross-sectional view of the three-dimensional structure of the present utility model;

[0016] Figure 2 It is a schematic cross-sectional view of the motor main shaft of the present utility model;

[0017] In the figure: 1: motor body, 2: pump body, 3: motor main shaft, 4: rotor assembly, 5: pumping gear, 6: liquid inlet flow channel, 7: liquid outlet flow channel, 51: driving gear, 52: driven gear, 31: transverse through hole, 61: end face cavity, 62: axial through hole, 11: motor housing, 12: shielding sleeve, 13: stator, 41: rotor, 42: rotor outer sleeve, 43: bearing Ⅰ, 44: bearing Ⅱ, 71: clearance Ⅰ, 72: clearance Ⅲ, 73: clearance Ⅴ, 74: clearance Ⅵ, 21: upper cover plate, 22: pump body, 23: lower cover plate, 24: liquid inlet, 25: liquid outlet, 26: O-ring seal, 27: wear-resistant block Ⅰ, 28: wear-resistant block Ⅱ. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] As shown Figure 1 in the figure, in Embodiment 1, an internal liquid cooling and heat dissipation circulation structure of a motor pump includes a motor body 1 and a pump body 2 which are connected. A motor main shaft 3 is rotatably arranged in the motor body 1. A rotor assembly 4 is arranged on the motor main shaft 3. The end of the motor main shaft 3 extends into the pump body 2 and is connected to a pumping gear 5 arranged in the pump body 2. There is an end face gap between the end face of the pumping gear 5 and the pump body 2. Liquid inlet channels 6 are arranged between the end face of the motor main shaft 3 and the pump body 2 and inside the motor main shaft 3, and the liquid inlet channels 6 are communicated with the end face gap. Liquid outlet channels 7 are arranged between the rotor assembly 4 and the motor body 1 and between the outer wall of the motor main shaft 3 and the pump body 2, and the liquid inlet channels 6 and the liquid outlet channels 7 are communicated inside the motor body 1. When the motor main shaft of the motor pump rotates to drive the pumping gear to work, due to the large liquid pressure, the working medium enters the end face gap of the pump body, then enters the motor body through the liquid inlet channels, and returns to the pump body through the liquid outlet channels, thus forming an internal heat dissipation circulation. During the heat dissipation process, neither the loss of the working medium is caused, nor can the internal heat of the motor body be taken away by the working medium. This embodiment achieves the purpose of dissipating heat inside the motor body, improves the heat dissipation effect, and enables the motor pump to have a wider application range, especially suitable for high-temperature environments. Moreover, the motor pump mechanism with this internal liquid cooling and heat dissipation circulation structure is simple, and the good heat dissipation effect makes it more durable.

[0020] As a further implementation manner, in this embodiment, the pump body 2 includes an upper cover plate 21, the upper cover plate 21 is connected to a pump body 22, the pump body 22 is connected to a lower cover plate 23, and an internal space for accommodating the pumping gear 5 is arranged on the pump body 22. In this embodiment, O-ring seals 26 are arranged at the joints between the upper cover plate 21 and the pump body 22 and between the pump body 22 and the lower cover plate 23.

[0021] In addition, a liquid inlet 24 and a liquid outlet 25 are arranged on the pump body 2. The liquid inlet 24 and the liquid outlet 25 are both communicated with the internal space and are respectively located on both sides of the pumping gear 5. The liquid inlet and the liquid outlet are arranged in this embodiment to provide channels for the entry and pumping out of the working medium. Among them, the liquid outlet channel 7 is communicated with the internal space on the side of the pumping gear 5 close to the liquid outlet 25. Thus, when the motor main shaft 3 drives the pumping gear 5 to work, the working medium entering through the liquid inlet 24 can be input into the liquid inlet channels 6, flow through the liquid outlet channels 7 to the internal space on the side of the liquid outlet, and finally flow out through the liquid outlet 25.

[0022] Embodiment 2. On the basis of Embodiment 1, the pumping gear 5 includes a driving gear 51 and a driven gear 52 that mesh with each other. An inner hole is provided at the axis of the driving gear 51, and the driving gear 51 is sleeved on the motor main shaft 3 through the inner hole. In this embodiment, a keyway is provided on the inner hole of the driving gear 51, and a transverse through hole 31 is provided on the motor main shaft 3. The transverse through hole penetrates the motor main shaft in a direction perpendicular to the motor main shaft. A pin shaft is provided in the transverse through hole 31, and the end of the pin shaft cooperates with the keyway to realize the fixation of the driving gear 51, so that the driving gear rotates when the motor main shaft rotates. The driven gear 52 is rotatably arranged in the internal space of the pump body 22 of the pump body 2, and the two ends of the gear shaft of the driven gear are respectively rotatably matched with the upper cover plate 21 and the lower cover plate 23. When the motor main shaft rotates, it synchronously drives the driving gear to rotate, and the driving gear synchronously drives the driven gear meshing with it to rotate, so as to achieve the purpose of pumping the working medium from the liquid inlet side to the liquid outlet side.

[0023] Among them, as Figure 1 , 2 shown, the liquid inlet flow channel 6 includes an end face cavity 61 provided between the end face of the motor main shaft 3 and the pump body 2. The end face gap includes the gap between the driving gear 51 and the pump body 2. The end face cavity 61 communicates with the gap between the upper end face of the driving gear 51 and the pump body 2. An axial through hole 62 is provided on the motor main shaft 3, and the two ends of the axial through hole 62 communicate with the end face cavity 61 and the liquid outlet flow channel 7 respectively. In this embodiment, the axial through hole 62 is a through hole penetrating the axis of the motor main shaft. When the driving gear rotates, the working medium can enter the end face cavity from the end face gap and enter the interior of the motor body through the axial through hole communicating with the end face cavity.

[0024] As a further implementation method, wear-resistant blocks are provided on the body 2 and are respectively matched with the two ends of the driving gear 51 and the driven gear 52. In this embodiment, the wear-resistant blocks respectively include wear-resistant block I 27 provided on one side of the driving gear and one side of the driven gear, and wear-resistant block II 28 provided on the other side of the driving gear and the other side of the driven gear. The setting of the wear-resistant blocks improves the wear resistance and the precision of the fit, and prolongs the service life.

[0025] Embodiment 3. On the basis of Embodiment 2, the motor body 1 includes a motor housing 11. A shielding sleeve 12 is provided inside the motor housing 11. The shielding sleeve 12 is connected to the pump body 2. The rotor assembly 4 is arranged inside the shielding sleeve 12. A stator 13 corresponding to the rotor assembly 4 is provided between the motor housing 11 and the shielding sleeve 12. In this embodiment, the middle of the shielding sleeve has a cylindrical cavity, and one end is open. The open end is fixedly connected to the lower cover plate of the pump body, so that when the working medium enters the cylindrical cavity, it can avoid the working medium contacting the stator and causing pollution or damage.

[0026] In this embodiment, the rotor assembly 4 includes a rotor 41 fixedly arranged on the motor main shaft 3. On the motor main shaft 3 on both sides of the rotor assembly 4, a bearing I 43 and a bearing II 44 are respectively arranged. The motor main shaft 3 is rotatably arranged in the shielding sleeve 12 through the bearing I 43 and the bearing II 44.

[0027] As a further optional implementation manner, to prevent the rotor from being contaminated or affecting the rotation of the rotor when the work stops and enters the shielding sleeve, a rotor outer sleeve 42 is arranged outside the rotor 41, so as to isolate the working medium from directly contacting the rotor.

[0028] Embodiment 4, on the basis of Embodiment 3, the liquid outlet flow channel 7 includes a clearance I 71 between the end face of the bearing I 43 and the shielding sleeve 12, a clearance II of the bearing I 43 itself, a clearance III 72 between the shielding sleeve 12 and the rotor outer sleeve 42, a clearance IV of the bearing II 44 itself, a clearance V 73 between the end face of the bearing II 44 and the pump body 2, and a clearance VI 74 between the motor main shaft 3 and the pump body 2 that are connected and communicated to form a flow channel. In this embodiment, the axial through hole 62 of the motor main shaft 3 in the liquid inlet flow channel 6 is communicated with the clearance I 71, so that the working medium can sequentially enter the clearance I 71, the clearance II, the clearance III 72, the clearance IV, the clearance V 73, and the clearance VI 74 through the axial through hole 62, and finally flow back to the internal space of the pump body 22 and is located on the side of the pumping gear 5 close to the liquid outlet 25, and finally is discharged through the liquid outlet 25.

[0029] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An internal liquid cooling heat dissipation circulation structure of a motor pump, comprising a motor body (1) and a pump body (2) connected to each other, wherein a motor main shaft (3) is rotatably arranged in the motor body (1), a rotor assembly (4) is arranged on the motor main shaft (3), an end of the motor main shaft (3) extends into the pump body (2) and is connected to a pumping gear (5) arranged in the pump body (2), an end face gap is provided between the end face of the pumping gear (5) and the pump body (2), and the characteristics are: A liquid inlet channel (6) is provided between the end surface of the motor main shaft (3) and the pump body (2) and inside the motor main shaft (3), and the liquid inlet channel (6) is communicated with the end surface gap; a liquid outlet channel (7) is provided between the rotor assembly (4) and the motor body (1), and between the outer wall of the motor main shaft (3) and the pump body (2), and the liquid inlet channel (6) and the liquid outlet channel (7) are communicated inside the motor body (1).

2. The internal liquid cooling and heat dissipation circulation structure of the motor pump according to claim 1 is characterized in that: The pumping gear (5) comprises a meshing driving gear (51) and a driven gear (52); an inner hole is provided at the axis of the driving gear (51) and the driving gear (51) is sleeved on the motor main shaft (3) through the inner hole; a key slot is provided on the inner hole; a transverse through hole (31) is provided on the motor main shaft (3); a pin is provided in the transverse through hole (31) and the end of the pin cooperates with the key slot to achieve the fixing of the driving gear (51); the driven gear (52) is rotatably arranged in the pump body (2); the end surface gap comprises the gap between the driving gear (51) and the pump body (2).

3. The internal liquid cooling and heat dissipation circulation structure of the motor pump according to claim 1 is characterized in that: The liquid inlet flow channel (6) comprises an end surface cavity (61) between the end surface of the motor main shaft (3) and the pump body (2); the end surface cavity (61) is communicated with the gap between the upper end surface of the driving gear (51) and the pump body (2); an axial through hole (62) is provided on the motor main shaft (3); two ends of the axial through hole (62) are respectively communicated with the end surface cavity (61) and the liquid outlet flow channel (7); and the pump body (2) is provided with wear-resistant blocks respectively matched with two ends of the driving gear (51) and the driven gear (52).

4. The internal liquid cooling and heat dissipation circulation structure of the motor pump according to any one of claims 1 to 3, characterized in that: The motor body (1) comprises a motor housing (11), a shielding sleeve (12) is arranged in the motor housing (11), the shielding sleeve (12) is connected to the pump body (2), a rotor assembly (4) is arranged in the shielding sleeve (12), and a stator (13) corresponding to the rotor assembly (4) is arranged between the motor housing (11) and the shielding sleeve (12).

5. The internal liquid cooling and heat dissipation circulation structure of the motor pump according to claim 4, characterized in that: The rotor assembly (4) comprises a rotor (41) fixedly mounted on a motor main shaft (3), wherein a rotor outer sleeve (42) is disposed outside the rotor (41).

6. The internal liquid cooling and heat dissipation circulation structure of the motor pump according to claim 5, characterized in that: A bearing I (43) and a bearing II (44) are respectively provided on the motor main shaft (3) on both sides of the rotor assembly (4); the motor main shaft (3) is rotatably arranged in the shielding sleeve (12) via the bearing I (43) and the bearing II (44).

7. The internal liquid cooling and heat dissipation circulation structure of the motor pump according to claim 6, characterized in that: The liquid outlet flow channel (7) comprises a flow channel formed by connecting a gap I (71) between the end surface of the bearing I (43) and the shielding sleeve (12), a gap II of the bearing I (43) itself, a gap III (72) between the shielding sleeve (12) and the rotor sleeve (42), a gap IV of the bearing II (44) itself, a gap V (73) between the end surface of the bearing II (44) and the pump body (2), and a gap VI (74) between the motor main shaft (3) and the pump body (2); and the liquid inlet flow channel (6) is connected to the gap I (71).

8. The internal liquid cooling and heat dissipation circulation structure of the motor pump according to any one of claims 1 to 3 and 5 to 7, characterized in that: The pump body (2) comprises an upper cover plate (21), the upper cover plate (21) is connected to a pump body (22), the pump body (22) is connected to a lower cover plate (23), and an internal space for accommodating a pumping gear (5) is provided on the pump body (22).

9. The internal liquid cooling and heat dissipation circulation structure of the motor pump according to claim 8, characterized in that: The pump body (2) is provided with a liquid inlet (24) and a liquid outlet (25), and the liquid inlet (24) and the liquid outlet (25) are both communicated with the internal space and are respectively located on both sides of the pumping gear (5).

10. The internal liquid cooling and heat dissipation circulation structure of the motor pump according to claim 9, characterized in that: The liquid outlet channel (7) is in communication with the internal space on a side close to the liquid outlet (25).

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