阅读说明：本技术 一种冷却装置及电主轴 (Cooling device and electric spindle ) 是由 邓扬 耿继青 何圳涛 陈永龙 汪正学 刘蕾 于 2021-08-19 设计创作，主要内容包括：本发明公开了一种冷却装置及电主轴,以解决现有的只对主轴或定子进行降温的循环冷却结构,只实现了局部冷却,冷却范围小的问题。本发明一种冷却装置包括：冷却组件,所述冷却组件设有第一冷却通道；轴承座,所述轴承座固定安装于所述冷却组件上,所述轴承座上设有轴承冷却通道；所述第一冷却通道与轴承冷却通道相连通。本发明第一冷却通道可同时冷却外壳和定子,第一冷却通道和轴承冷却通道连通形成一个整体的循环冷却通道,进一步扩大了冷却区域,对电机外壳、定子和轴承座同时起到降温的效果。(The invention discloses a cooling device and an electric spindle, and aims to solve the problems that only local cooling is realized and the cooling range is small in the conventional circulating cooling structure for cooling only a spindle or a stator. A cooling device of the present invention includes: the cooling assembly is provided with a first cooling channel; the bearing block is fixedly arranged on the cooling assembly, and a bearing cooling channel is arranged on the bearing block; the first cooling passage is in communication with the bearing cooling passage. The first cooling channel can simultaneously cool the shell and the stator, and the first cooling channel is communicated with the bearing cooling channel to form an integral circulating cooling channel, so that the cooling area is further expanded, and the effect of cooling the motor shell, the stator and the bearing seat is achieved simultaneously.)

1. A cooling apparatus, comprising:

the cooling assembly is provided with a first cooling channel;

the bearing block is fixedly arranged on the cooling assembly, and a bearing cooling channel is arranged on the bearing block;

the first cooling passage is in communication with the bearing cooling passage.

2. A cooling apparatus as claimed in claim 1, wherein said cooling assembly comprises:

a housing, an inner surface of which forms a mounting hole;

the cooling sleeve is fixedly arranged in the mounting hole;

the first cooling channel is formed on the outer shell and the cooling jacket;

the bearing seat is fixedly arranged on one side of the shell.

3. A cooling apparatus as claimed in claim 2, wherein a first passage extending axially along said cooling jacket is provided between said inner and outer surfaces of said housing, said first passage extending through said housing, said bearing cooling passage being provided with a second cooling inlet and a second cooling outlet, said first passage communicating with said second cooling inlet, said second cooling outlet communicating with said first cooling passage.

4. A cooling device as claimed in claim 3, wherein the bearing housing is provided with a plurality of first annular channels distributed along the axial direction, the side wall of any one of the first annular channels is provided with an elongated slot, two adjacent first annular channels are communicated with each other through the elongated slot, the bearing housing is further provided with a second channel having the second cooling inlet and a third channel having the second cooling outlet, the third channel and the second channel are respectively communicated with the first annular channels, and the bearing cooling channel is formed by the plurality of first annular channels, the elongated slot between two adjacent first annular channels, the second channel and the third channel.

5. A cooling apparatus as claimed in claim 4, wherein said first annular passage in said bearing housing closest to said housing communicates with said third passage and said first annular passage in said bearing housing furthest from said housing communicates with said second passage.

6. A cooling apparatus as claimed in any one of claims 3 to 5, wherein the outer surface of the cooling jacket is provided with a plurality of second annular passages circumferentially surrounding itself, two adjacent second annular passages are provided at a distance, the housing is provided with a plurality of return passages having an inlet and an outlet, the inlet and the outlet of each return passage correspond to two adjacent second annular passages, any one of the second annular passages between the two second annular passages nearest and farthest to the housing is provided opposite to the inlet of the return passage and the outlet of the other return passage so that the two adjacent second annular passages communicate with each other, the housing is provided with a fourth passage having a first cooling inlet and a fifth passage having a first cooling outlet, the second annular passage nearest to the housing communicates with the fourth passage, the second annular channel farthest from the bearing seat is communicated with the fifth channel;

the number of second annular passages, the number of turn-back passages, a fourth passage having a first cooling inlet, and a fifth passage having a first cooling outlet form the first cooling passage.

7. The cooling device as claimed in claim 6, wherein a second annular retaining shoulder is formed between two adjacent second annular channels, the second annular retaining shoulder is attached to the inner wall of the housing, and a notch extending axially along the cooling jacket is formed in the second annular retaining shoulder and is used for shunting the cooling medium in the second annular channels.

8. A cooling device as claimed in claim 7, wherein said notch is arranged obliquely; when the first cooling channel is filled with a cooling medium, the cooling medium flows in the first cooling channel, the cooling medium flows from one second annular channel to the other second annular channel through the notch, the inclination direction of the notch is consistent with the flowing direction of the cooling medium in the other second annular channel, and the cooling medium flows from the notch into the other second annular channel.

9. The cooling device as claimed in claim 6, wherein at least one set of a channel and B channel is provided between the inner surface and the outer surface of the housing, the a channel extends through both end surfaces of the housing, a first cooling inlet is formed at one end of the bearing seat on the housing, a first cooling outlet is formed at the other end of the housing, a row of a holes communicating with the a channel and a row of B holes communicating with the B channel are provided on the inner wall of the housing, and the a holes and the B holes in the row correspond to the second annular channels one by one;

a plug is arranged in the channel A at every two A holes, so that the two A holes between the two plugs are communicated to form the turn-back channel;

and a plug is arranged in the channel B at every two B holes, so that the two B holes between the two plugs are communicated to form the return channel.

10. The cooling device as claimed in claim 9, wherein the plugs of the a channel and the plugs of the B channel are arranged to be offset from each other in the axial direction of the cooling jacket, so that two adjacent second annular channels communicate with each other.

11. A cooling device as claimed in claim 9, wherein a section of the a channel between the choke plug nearest to the bearing seat and the bearing seat is used as the fourth channel, and a port on the a channel on one side of the bearing seat is used as the first cooling inlet; and a channel from the choke plug farthest from the bearing seat in the channel A to one end of the channel A opposite to the bearing seat in the channel A is used as the fifth channel, and a port of the channel A opposite to the bearing seat in the channel A is used as the first cooling inlet and outlet.

12. An electric spindle comprising a cooling device as claimed in any one of claims 1 to 11.

13. An electric spindle as claimed in claim 12, characterized in that it comprises:

the stator is arranged on the inner wall of the cooling jacket;

the main shaft is rotatably arranged on the bearing seat;

the rotor is fixedly installed on the main shaft, the rotor is matched with the stator, and the stator, the main shaft and the rotor are coaxially arranged.

Technical Field

The invention relates to the technical field of electric spindles, in particular to a cooling device and an electric spindle.

Background

At present, the cooling effect of the electric spindle in operation mainly controls two aspects, namely, controlling media (such as cooling water and oil) provided by a spindle cooling system and controlling a cooling structure (such as a flow passage structure) of the spindle cooling system. After the cooling medium is selected, the cooling structure of the main shaft can directly influence the cooling effect of the main shaft. The cooling structure of the existing main shaft adopts a circulating cooling structure to cool the main shaft or the stator, only local cooling is realized, the cooling range is small, and the cooling effect is limited.

Disclosure of Invention

In view of the above, the invention discloses a cooling device and an electric spindle, which are used for solving the problems that the existing circulating cooling structure only used for cooling a spindle or a stator only realizes local cooling and has a small cooling range.

In order to achieve the above object, the invention adopts the following technical scheme:

a first aspect of the present invention discloses a cooling device, comprising:

the cooling assembly is provided with a first cooling channel;

the bearing block is fixedly arranged on the cooling assembly, and a bearing cooling channel is arranged on the bearing block;

the first cooling passage is in communication with the bearing cooling passage.

Further, the cooling assembly includes: a housing, an inner surface of which forms a mounting hole; the cooling sleeve is fixedly arranged in the mounting hole; the first cooling channel is formed on the outer shell and the cooling jacket; the bearing seat is fixedly arranged on one side of the shell.

Further, a first channel extending along the axial direction of the cooling jacket is arranged between the inner surface and the outer surface of the shell, the first channel penetrates through the shell, the bearing cooling channel is provided with a second cooling inlet and a second cooling outlet, the first channel is communicated with the second cooling inlet, and the second cooling outlet is communicated with the first cooling channel.

Furthermore, the bearing seat is provided with a plurality of first annular channels distributed along the axial direction, the side wall of any one of the first annular channels is provided with a long groove, two adjacent first annular channels are communicated through the long groove, the bearing seat is further provided with a second channel with a second cooling inlet and a third channel with a second cooling outlet, the third channel and the second channel are respectively communicated with the first annular channels, and the bearing cooling channels are formed by the plurality of first annular channels, the long grooves between two adjacent first annular channels, the second channel and the third channel.

Further, the first annular channel on the bearing seat closest to the housing is communicated with the third channel, and the first annular channel on the bearing seat farthest from the housing is communicated with the second channel.

Furthermore, a plurality of second annular channels which are arranged around the outer surface of the cooling jacket along the circumferential direction of the cooling jacket are arranged on the outer surface of the cooling jacket, two adjacent second annular channels are arranged at intervals, a plurality of turn-back channels with inlets and outlets are arranged on the shell, the inlet and the outlet of each turn-back channel correspond to two adjacent second annular channels, any one of the second annular channels between the two second annular channels closest to and farthest from the bearing seat is arranged opposite to the inlet of the turn-back channel and the outlet of the other turn-back channel, so that the two adjacent second annular channels are mutually communicated, the shell is provided with a fourth channel with the first cooling inlet and a fifth channel with the first cooling outlet, the second annular channel closest to the bearing seat is communicated with the fourth channel, and the second annular channel farthest from the bearing seat is communicated with the fifth channel; the number of second annular passages, the number of turn-back passages, a fourth passage having a first cooling inlet, and a fifth passage having a first cooling outlet form the first cooling passage.

And furthermore, two adjacent second annular channels form a second annular retaining shoulder therebetween, the second annular retaining shoulder is attached to the inner wall of the shell, a notch axially extending along the cooling sleeve is formed in the second annular retaining shoulder, and the notch is used for shunting the cooling medium in the second annular channels.

Further, the notch is obliquely arranged; when the first cooling channel is filled with a cooling medium, the cooling medium flows in the first cooling channel, the cooling medium flows from one second annular channel to the other second annular channel through the notch, the inclination direction of the notch is consistent with the flowing direction of the cooling medium in the other second annular channel, and the cooling medium flows from the notch into the other second annular channel.

Furthermore, at least one group of channels A and channels B extending along the axial direction of the cooling jacket are arranged between the inner surface and the outer surface of the shell, the channels A penetrate through the two end faces of the shell, a first cooling inlet is formed at one end of the bearing seat on the shell, a first cooling outlet is formed at the other end of the shell, a row of holes A communicated with the channels A and a row of holes B communicated with the channels B are arranged on the inner wall of the shell, and the rows of holes A and the rows of holes B correspond to the second annular channels one by one;

a plug is arranged in the channel A at every two A holes, so that the two A holes between the two plugs are communicated to form the turn-back channel;

and a plug is arranged in the channel B at every two B holes, so that the two B holes between the two plugs are communicated to form the return channel.

Furthermore, the plugs in the channel A and the plugs in the channel B are arranged in a staggered mode along the axial direction of the cooling jacket, so that the two adjacent second annular channels are communicated with each other.

Further, a section of channel between the plug nearest to the bearing seat and the bearing seat in the channel a serves as the fourth channel, and a port on the channel a on one side of the bearing seat serves as the first cooling inlet; and a channel from the choke plug farthest from the bearing seat in the channel A to one end of the channel A opposite to the bearing seat in the channel A is used as the fifth channel, and a port of the channel A opposite to the bearing seat in the channel A is used as the first cooling inlet and outlet.

In a second aspect, the invention discloses an electric spindle, which comprises the cooling device of the first aspect.

Further, the electric spindle further comprises: the stator is arranged on the inner wall of the cooling jacket; the main shaft is rotatably arranged on the bearing seat; the rotor is fixedly installed on the main shaft, the rotor is matched with the stator, and the stator, the main shaft and the rotor are coaxially arranged.

Has the advantages that: the first cooling channel can simultaneously cool the shell and the stator, and the first cooling channel is communicated with the bearing cooling channel to form an integral circulating cooling channel, so that the cooling area is further enlarged, the bearing seat is cooled, the main shaft is cooled, the motor shell and the stator are simultaneously cooled, and the problem of small cooling range of a cooling structure in the prior art is solved.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.

Fig. 1 shows a first position cross-sectional view of a cooling device in embodiments 1 and 2;

FIG. 2 is a cross-sectional view T-T of FIG. 1;

fig. 3 shows a second position sectional view of the cooling device in embodiments 1 and 2;

FIG. 4 shows a schematic view of a cooling jacket in example 1;

FIG. 5 is an enlarged view of a portion of FIG. 4 at I;

FIG. 6 is a cross-sectional view A-A of FIG. 4;

fig. 7 is a partial enlarged view at II of fig. 6.

Reference numbers in the figures: 10-a housing; 20-a cooling jacket; 30-a bearing seat; 40-bearing water cooling jacket; 50-a stator; 60-a main shaft; 70-a rotor; a-a first cooling inlet; b-a first cooling outlet; c-a second cooling inlet; d-a second cooling outlet; v-elongated slot; e-a second channel; f-a third channel; g-a fourth channel; h-a fifth channel; k-notch; 11-a first channel; 12-a reentrant pathway; 21-a second annular channel; 22-a second annular shoulder; 31-a first annular channel; 32-a first annular shoulder; 131-A holes; 132-plug; 141-B holes; and (m-plugging).

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.

To further illustrate the technical solution of the present invention, the following specific examples are provided with reference to fig. 1 to 7.

Example 1

The present embodiment takes the electric spindle as an example to describe how the cooling device performs the cooling function in the electric spindle, but the protection scope is not limited to the electric spindle.

In the present embodiment, there is provided a cooling device, as shown in fig. 1 and 3, including: the cooling assembly is provided with a first cooling channel; the bearing seat 30 is fixedly arranged on the cooling assembly, and a bearing cooling channel is arranged on the bearing seat 30; the first cooling passage is in communication with the bearing cooling passage.

Specifically, the cooling assembly includes: a housing 10, an inner surface of the housing 10 forming a mounting hole; the cooling jacket 20 is fixedly arranged in the mounting hole; the first cooling passage is formed on the outer case 10 and the cooling jacket 20; the bearing housing 30 is fixedly installed at one side of the housing 10.

In order to further improve the cooling effect of the housing, a first channel 11 extending axially along the cooling jacket 20 is provided between the inner surface and the outer surface of the housing 10, the first channel 11 penetrates through the housing 10, the bearing cooling channel is provided with a second cooling inlet c and a second cooling outlet d, the first channel 11 is communicated with the second cooling inlet c, and the second cooling outlet d is communicated with the first cooling channel.

In order to further improve the cooling effect of the bearing seat, as a preferred embodiment of this embodiment, as shown in fig. 1 to fig. 3, a plurality of first annular channels 31 distributed along the axial direction are provided on the bearing seat 30, a long groove v is provided on a side wall of any one of the first annular channels 31, two adjacent first annular channels 31 are communicated with each other through the long groove v, a second channel e having the second cooling inlet c and a third channel f having the second cooling outlet d are further provided on the bearing seat 30, the third channel f and the second channel e are respectively communicated with the first annular channels 31, and the plurality of first annular channels 31, the long groove v between two adjacent first annular channels 31, the second channel e and the third channel f form the bearing cooling channel. By providing the elongated groove v, the flow resistance between two adjacent first annular passages 31 is reduced.

In the related art, patent No. CN208304592U proposes a motor cooling structure for an electric machine, in which a motor cooling structure is provided inside a connection plate surface outside a main shaft, and cooling oil is injected into an inlet and an outlet of an end surface of the connection plate to cool the main shaft. The square box connecting plate and the motor cooling structure are not universal to a circular mounting structure of a common main shaft. On the other hand, the flow channel arranged in the square structure only plays a role of communicating the inlet/outlet and does not participate in main cooling.

In the prior art, patent No. CN203722415U proposes a cooling structure for a stator of an electric motor, in which a heat conducting sleeve having a large contact area with the stator is disposed between a machine body of an electric spindle and the stator, so that heat generated by the stator during operation can be taken away by a cooling liquid. The cooling flow channel structure arranged on the shaft sleeve still only plays a role of communicating the inlet/outlet of the main cooling flow channel, and does not play a main cooling role.

In the prior art, patent No. CN205765256U discloses an internal dual-water jacket cooling structure of a high-speed spindle, which needs to set a dual-water jacket three-ring flow channel structure inside the spindle to perform combined circulating cooling, although the cooling range is increased to some extent, the flow channel path is almost increased by 1 time, the flow resistance is obvious, the pressure loss is large, and the flow rate of the spindle is small.

The technical problem that cooling structure exists among the prior art is that the cooling scope to the main shaft is limited, has only realized the cooling of local scope, and increases cooling scope flow resistance scope great, can make the flow resistance increase, and the too big mobility that can arouse cooling medium of flow resistance diminishes, and heat exchange efficiency step-down, the cooling effect is general. The elongated groove v is arranged in the embodiment, so that the flow resistance of the bearing cooling channel can be reduced, the bearing cooling channel is communicated with the first cooling channel, and the cooling of the stator and the cooling of the bearing seat 30 are realized simultaneously.

To further enhance the cooling effect of the bearing housing 30, the first annular channel 31 on the bearing housing 30 closest to the housing 10 is communicated with the third channel f, and the first annular channel 31 on the bearing housing 30 furthest from the housing 10 is communicated with the second channel e. By adopting the connection mode, the third channel f and the second channel e extend along the axial direction of the bearing seat 30 as much as possible, the flowing time of the cooling medium in the bearing cooling channel is prolonged, and the cooling effect of the bearing seat 30 is further enhanced.

As an optional implementation manner of this embodiment, a specific structure of the bearing cooling channel on the bearing seat 30 is as follows: the surface of bearing frame 30 is cylindrical, the excircle surface of bearing frame 30 is equipped with the continuous annular of a plurality of, forms first annular between two adjacent annular and keeps off shoulder 32, the excircle surface cover of bearing frame 30 is equipped with bearing water-cooling jacket 40, the both sides of the internal surface of bearing water-cooling jacket 40 pass through the sealing washer with the excircle surface of bearing frame 30 and seal, make first annular keeps off shoulder 32 with a plurality of first annular 31 spaced apart formation first annular channel 31, keeps off shoulder 32's side at every first annular and has seted up elongated slot v, elongated slot v link up first annular keeps off shoulder 32's both sides face makes adjacent two the annular is linked together and is formed the passageway. The bearing seat 30 one end face is equipped with along No. 1 hole and No. 2 hole of bearing frame 30 axial extension, and the distance of No. 2 hole to the bearing frame 30 axis is more far than the distance of No. 1 hole to bearing frame 30 axis, No. 1 hole is located between bearing frame hole and the first annular channel 31 the side of bearing frame 30 is seted up along No. 3 holes of bearing frame 30 radial extension, No. 1 hole with No. 2 hole respectively with No. 3 holes link up to the port in No. 1 hole and No. 3 hole is sealed through shutoff m, the port in No. 2 hole is regarded as second cooling entry c, and No. 4 holes have been seted up to the bottom of the first annular channel 31 that is farthest away from shell 10 terminal surface, No. 4 holes with No. 1 hole link up, No. 1 hole, No. 2 hole, No. 3 hole and No. 4 hole form the second passageway e. Similarly, the bearing seat 30 is provided with the same hole 1 ', hole 2', hole 3 'and hole 4' on the other side of the axis opposite to the hole 1, hole 2, hole 3 and hole 4, the only difference is that the hole 4 'is provided at the bottom of the first annular channel 31 closest to the housing 10, and the port of the hole 2' is used as the second cooling outlet d, the hole 1 ', the hole 2', the hole 3 'and the hole 4' to form the third channel f.

In order to further increase the cooling effect of the bearing seat 30, optionally, a plurality of second channels e and a plurality of third channels f may be arranged along the circumference of the bearing seat 30, and the plurality of second channels e are disposed on the same side, inlets of the plurality of second channels e are in a kidney-shaped groove structure, so that the plurality of second channels e share one inlet, the plurality of third channels f are disposed on the same side, and outlets of the plurality of third channels f may also be in a kidney-shaped groove structure, so that the plurality of third channels f share one outlet.

In order to further enhance the cooling effect of the stator and the housing 10, how the first cooling channel cools the housing 10 and the stator is explained below.

As a preferred embodiment of this embodiment, as shown in fig. 3 and 4, the outer surface of the cooling jacket 20 is provided with a plurality of second annular channels 21 surrounding itself along the circumferential direction, two adjacent second annular channels 21 are arranged at intervals, the housing 10 is provided with a plurality of turn-back channels 12 having inlets and outlets, the inlet and the outlet of each turn-back channel 12 correspond to two adjacent second annular channels 21, any one of the second annular channels 21 between the two second annular channels 21 closest and farthest to the bearing seat 30 is arranged opposite to the inlet of the turn-back channel 12 and the outlet of the other turn-back channel 12, so that the two adjacent second annular channels 21 are communicated with each other, the housing 10 is provided with a fourth channel g having the first cooling inlet a and a fifth channel h having the first cooling outlet b, the second annular channel 21 closest to the bearing seat 30 communicates with the fourth channel g, and the second annular channel 21 farthest from the bearing seat 30 communicates with the fifth channel h; the plurality of second annular passages 21, the plurality of turn-back passages 12, the fourth passage g having the first cooling inlet a, and the fifth passage h having the first cooling outlet b form the first cooling passage. The turn-back channel 12 is arranged on the shell 10, so that the conduction of the plurality of second annular channels 21 forms a series channel to realize the cooling of the stator, and meanwhile, the flow of the cooling medium in the turn-back channel 12 of the shell 10 realizes the further cooling of the shell 10.

The two ends of the cooling jacket 20 are sealed with the housing 10 by sealing rings, and the sealing rings are located on two sides of the plurality of second annular channels 21 to prevent cooling medium from entering the stator.

The cooling medium enters the bearing cooling channel from the first channel 11 of the housing 10, then flows out of the bearing cooling channel and enters the first cooling channel to further cool the housing 10 and the stator in a circulating manner, so that the combined cooling of the bearing seat 30, the housing 10 and the stator is realized, the cooling range is enlarged compared with the prior art, and the flow resistance is small.

In order to further reduce the flow resistance of the first cooling channel, as shown in fig. 4 to 7, a second annular blocking shoulder 22 is formed between two adjacent second annular channels 21, the second annular blocking shoulder 22 is attached to the inner wall of the housing 10, a gap k extending along the axial direction of the cooling jacket 20 is formed in the second annular blocking shoulder 22, and the gap k is used for shunting the cooling medium in the second annular channel 21.

Specifically, the notch k is obliquely arranged; when the first cooling channels are filled with the cooling medium and the cooling medium flows in the first cooling channels, as shown in fig. 4 and 5, arrows in the drawings indicate the flow direction of the cooling medium, the cooling medium flows from one of the second annular channels 21 into the other second annular channel 21 through the notch k, the inclination direction of the notch k coincides with the flow direction of the cooling medium in the other second annular channel 21, and the cooling medium flows forward from the notch k into the other second annular channel 21. Through the setting of second annular fender shoulder breach k, reduce the resistance of cooling medium axial flow, not only make cooling medium can be in second annular channel 21 with flow in the series channel that the passageway formed turns back, can also be at the axial flow of a plurality of second annular channel 21 to the flow direction of cooling medium from breach k is following current outflow, reduces cooling medium's flow resistance, strengthens cooling medium's circulating fluidity, has improved the cooling effect of shell 10, bearing frame 30 and stator.

As shown in fig. 6 and 7, the number of the notches K on the same second annular shoulder 22 may be multiple, and the notches K are uniformly arranged along the circumferential direction of the second annular shoulder, so that the flow resistance of the cooling medium can be reduced.

In the prior art, patent No. CN112743113A proposes an improved method for cooling water jacket structure of electric spindle, which changes the flow speed of the cooling liquid flowing through the cooling system by grooving the bottom and the side wall of the spiral flow channel, and destroys the flow boundary layer, thereby changing the original stable flow state. Although the method changes the fluid state and increases the heat exchange capacity of the fluid, a certain flow resistance is increased by a plurality of notches on the wall surface of the flow channel, so that the flow rate is reduced, and on the other hand, the whole cooling area is not changed greatly.

This embodiment combines together through cooling jacket 20 and shell 10, and first cooling channel is formed on cooling jacket 20 and shell 10, is equipped with a plurality of second annular channel 21 on cooling jacket 20, and set up some hole formation passageways on the shell 10, avoid seting up second annular channel 21 and reduce the intensity of shell 10 on shell 10, and simultaneously, set up breach k and realize on the one hand that the reposition of redundant personnel of coolant medium in second annular channel 21 has reduced the flow resistance, breach k slope sets up and makes coolant medium following current flow in next second annular channel 21, the reduction flow resistance that can be more showing, reduce the pressure differential of this embodiment cooling inlet and outlet, the circulation mobility of reinforcing coolant medium, improve the heat transfer rate, guarantee the cooling effect of shell, bearing frame 30 and stator.

Further, at least one group of channels a and B extending along the axial direction of the cooling jacket is arranged between the inner surface and the outer surface of the housing 10, the channel a penetrates through two end surfaces of the housing 10, a first cooling inlet a is formed at one end of the bearing seat 30 on the housing 10, a first cooling outlet B is formed at the other end of the housing 10, a row of holes a 131 communicated with the channel a and a row of holes B141 communicated with the channel B are arranged on the inner wall of the housing 10, and the row of holes a 131 and the row of holes B141 correspond to the plurality of second annular channels 21 one by one; a plug 132 is arranged in the channel A at every two A holes 131, so that the two A holes 131 between the two plugs 132 are communicated to form the return channel 12; and one plug 132 is arranged in the channel B at every two B holes 141, so that the two B holes 141 between the two plugs 132 are communicated to form the reentrant channel 12.

Specifically, as shown in fig. 3, the plugs 132 in the a channel and the plugs 132 in the B channel are arranged in a staggered manner along the axial direction of the cooling jacket 20, so that two adjacent second annular channels 12 are communicated with each other.

Further, as shown in fig. 3, a section of the channel from the plug 132 of the channel a closest to the bearing seat 30 serves as the fourth channel g, and a port of the channel a on one side of the bearing seat serves as the first cooling inlet a; a channel from a choke plug 132 farthest from the bearing seat 30 in the channel a to a port on the opposite side of the bearing seat 30 in the channel a serves as the fifth channel h, and a port on the opposite side of the channel a to the bearing seat 30 serves as the first cooling inlet/outlet b.

As an optional implementation manner of this embodiment, when the a channel and the row of a holes 131 are multiple in the circumferential direction of the housing 10, and the B channel and the row of B holes 141 are multiple in the circumferential direction of the housing 10, the first cooling inlet a and the first cooling inlet outlet B may be in a waist-shaped groove structure, such that the fourth channels g share one inlet, and the fifth channels h share one outlet, wherein the a channel is disposed on the same side of the cooling jacket 20, and the B channel is disposed on the other side of the cooling jacket 20 opposite to the a channel, which may facilitate the arrangement of the waist-shaped groove structure.

Adopt to set up the mode of helical coiled passage on the shell among the prior art and cool off to set up the recess on helical coiled passage and increase heat transfer ability, nevertheless kind of cooling structure can reduce motor housing's intensity, can increase the flow resistance simultaneously.

The first cooling channel adopts a mode of combining the cooling jacket 20 and the shell 10 to carry out combined cooling on the stator and the shell 10, so that the number of notches on the shell 10 is reduced, the strength of the shell 10 is improved, and meanwhile, gaps k are arranged between two adjacent second annular channels 21, so that the flow resistance is reduced; and the heat exchange is combined with the bearing cooling channel, so that the inlet-outlet pressure difference of the cooling channel is reduced, the cooling flow is increased, the cooling range is enlarged, and the temperature of the shell, the bearing seat and the stator can be obviously reduced due to small resistance.

Example 2

The present embodiment provides an electric spindle, as shown in fig. 1 and 3, including the cooling device described in embodiment 1.

The cooling device further includes: a stator 50, the stator 50 being disposed on an inner wall of the cooling jacket 20; a main shaft 60, wherein the main shaft 60 is rotatably arranged on the bearing seat 30; the rotor 70 is fixedly installed on the main shaft 60, the rotor 70 is matched with the stator 50, and the stator 50, the main shaft 60 and the rotor 70 are coaxially arranged.

Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.