阅读说明：本技术 一种数控车床高速低温电主轴 (High-speed low-temperature electric spindle of numerical control lathe ) 是由 陆永强 于 2021-07-05 设计创作，主要内容包括：一种数控车床高速低温电主轴,包括热传输结构(20),所述热传输结构(20)包括蒸发器(21)、冷凝器(22)和馈液罐(23)；蒸发器(21)通过蒸汽管(24)连通冷凝器(22),冷凝器(22)出液管连通馈液罐(23),馈液罐(23)通过返流管(25)连通蒸发器(21)；蒸发器(21)包括第一散热(16)和第二散热(17),所述第一散热(16)设于支撑主轴(13)的前后两轴承套(15),所述第一散热(16)为静馈液蒸发(30),所述第二散热(17)设于电机外壳(10)的壳冷槽(10.1),所述第二散热(17)为动馈液蒸发(60,600)第一散热(16)和第二散热(17)的并联路形成所述蒸发器(21)。(A high-speed low-temperature electric spindle of a numerical control lathe comprises a heat transmission structure (20), wherein the heat transmission structure (20) comprises an evaporator (21), a condenser (22) and a liquid feeding tank (23); the evaporator (21) is communicated with the condenser (22) through a steam pipe (24), a liquid outlet pipe of the condenser (22) is communicated with the liquid feed tank (23), and the liquid feed tank (23) is communicated with the evaporator (21) through a return pipe (25); evaporator (21) includes first heat dissipation (16) and second heat dissipation (17), two bearing housing (15) around supporting main shaft (13) are located in first heat dissipation (16), first heat dissipation (16) are quiet to be presented liquid evaporation (30), the shell cold groove (10.1) of motor housing (10) are located in second heat dissipation (17), second heat dissipation (17) are for moving the parallel circuit formation of presenting liquid evaporation (60,600) first heat dissipation (16) and second heat dissipation (17) evaporator (21).)

1. A high-speed low-temperature electric spindle of a numerical control lathe comprises a motor shell (10), wherein a spindle (13) is rotatably arranged on the motor shell (10) through a bearing (14), a bearing sleeve (15) is coaxially sleeved between the motor shell (10) and the bearing (14), and the outer peripheral surface of the motor shell (10) is provided with a shell cooling groove (10.1); which is characterized by comprising

The heat transfer structure (20), the heat transfer structure (20) comprising an evaporator (21), a condenser (22) and a feed tank (23); the evaporator (21) is communicated with the condenser (22) through a steam pipe (24), a liquid outlet pipe of the condenser (22) is communicated with the liquid feed tank (23), and the liquid feed tank (23) is communicated with the evaporator (21) through a return pipe (25); a working fluid (26) is circulated to the heat transfer structure (20); the evaporator (21) comprises a first heat dissipation part (16) and a second heat dissipation part (17), the first heat dissipation part (16) is arranged on a front bearing sleeve and a rear bearing sleeve (15) of a supporting main shaft (13), the first heat dissipation part (16) is static feeding liquid evaporation (30), the static feeding liquid evaporation (30) comprises an annular liquid suction core (31), a foamed copper ring (32), a gas collection chamber (35) and a liquid collection chamber (37), and the annular liquid suction core (31) is overlapped with the foamed copper ring (32) and is arranged on the bearing sleeves (15) and communicated with the gas collection chamber (35) and the liquid collection chamber (37);

the second heat dissipation (17), the shell cold groove (10.1) of motor housing (10) is located in second heat dissipation (17), second heat dissipation (17) are moved and are presented liquid evaporation (60,600), move and present liquid evaporation (60,600) including presenting liquid ring (61), present liquid ring (61) fixed connection superpose second foam copper ring (64) and second imbibition core ring (65), present liquid still (61) rotatory locate in shell cold groove (10.1).

2. The numerically controlled lathe high-speed low-temperature motorized spindle according to claim 1, characterized in that the first heat sink (16) is replaced by a kinetic feed liquid evaporator (600).

3. The numerically controlled lathe high-speed low-temperature motorized spindle according to claim 1, wherein the bearing sleeve (15) comprises a concave-tooth heat exchange chamber (50), the concave-tooth heat exchange chamber (50) comprises a front support ring tooth (51) and a rear support ring (52) which are arranged on the periphery of the bearing sleeve, the front support ring tooth (51) and the rear support ring (52) form an annular groove (53), the annular groove (53) is arranged on the annular liquid suction core (31) and the copper foam ring (32) in an overlapped mode, and the annular liquid suction core (31) abuts against the bottom surface of the annular groove (53).

4. A high-speed low-temperature motorized spindle of a numerically controlled lathe according to claim 3, wherein the annular liquid suction core (31) and the copper foam ring (32) are integrally connected with a liquid suction extension part (33) and a foam extension part (34) between the front support ring teeth (51), a tooth-shaped liquid collection channel (36) is formed between the gas collection chamber (35) and the front support ring teeth (51), an annular space between the bearing sleeve (15) and the gas collection chamber (35) forms an annular liquid feed channel (39), the tooth-shaped liquid collection channel (36) is communicated with the gas collection chamber (35), and the tooth-shaped liquid feed channel (39) is communicated with the liquid collection chamber (37).

5. The numerical control lathe high-speed low-temperature electric spindle as claimed in claim 2, wherein the bearing sleeve (15) comprises a bearing placing chamber (40), the bearing placing chamber (40) comprises a positioning step (41), an inner oil sealing ring (41) and an outer oil sealing ring cover (42) which are integrally connected with the bearing sleeve in an inner hole of the bearing sleeve, the outer oil sealing ring cover (42) comprises a jacking step (43), the bearing is placed in the inner hole of the bearing sleeve until an outer ring abuts against the positioning step (41), and the outer oil sealing ring cover (42) is placed in the inner hole of the bearing sleeve in an interference mode until the jacking step (43) jacks against the outer ring of the bearing.

6. The numerically controlled lathe high-speed low-temperature motorized spindle as claimed in claim 1, wherein a second liquid collecting ring chamber (67) is formed between the liquid feeding ring (61) and the shell cooling groove (17), and an arc-shaped groove (62) is formed in the middle section of the inner wall of the liquid feeding ring (61).

7. The numerically controlled lathe high-speed low-temperature motorized spindle as claimed in claim 1, wherein a driving portion is arranged on an outer wall of the liquid feeding ring (61), the driving portion is a driven gear (66), the driven gear (66) is meshed with a driving gear (68), and the driving gear (68) is connected with a motor.

8. The numerically controlled lathe high-speed low-temperature motorized spindle as claimed in claim 1, wherein a driving portion is provided on an outer wall of the liquid feeding ring (61), the driving portion includes a water worm gear (660) fixedly connected to the liquid feeding ring (61), the water worm gear (660) is provided in the vortex water channel (661), and the water worm gear is driven by water flowing continuously in the vortex water channel (661) to rotate slowly.

9. The high-speed low-temperature motorized spindle of the numerically controlled lathe according to claim 1, wherein a water inlet (662) is formed in one end of the vortex water channel (661) and located at the highest point of the water turbine (660) clockwise and rightwards, a water outlet (663) is formed in the vortex water channel (661) and located at the lowest point of the water turbine (660) clockwise and leftwards, and the water inlet (662) and the water outlet (663) cover a force application arc section (664) of the vortex water channel (661) with a sector angle of at least 90 degrees.

10. The numerically controlled lathe high-speed low-temperature motorized spindle according to claim 8, characterized in that the water inlet (662) is connected to a water source (665), the height from the water source (665) through the plane of the water inlet (662) is a working head (H), hydraulic potential energy flowing into the vortex water channel (661) is formed, and the rotation speed (n) of the water turbine (660) is adjusted by digitally adjusting the height of the working head (H) according to the temperature of the bearing housing or the motor housing.

Technical Field

The invention relates to the technical field of lathes, in particular to a high-speed low-temperature electric spindle of a numerical control lathe.

Background

The main shaft of the machine tool is directly driven by the built-in motor, so that the length of a main transmission chain of the machine tool is shortened to zero, and zero transmission consumption of the machine tool is realized. The transmission structure form of the spindle motor and the spindle which are combined into a whole enables the spindle part to be relatively independent from the transmission system and the whole structure of the machine tool, so that the spindle unit can be made into a spindle unit which is commonly called as an electric spindle. The machining error of parts caused by the thermal state characteristic problem of the high-speed motorized spindle reaches 60-80%, and is the key of the service life and the machining precision and working efficiency.

The heat source mainly generating heat in the electric spindle comes from the stator and the bearing. For stator heat dissipation, in the prior art, a spindle housing is usually provided with a cooling water channel, and cooling oil is added into the spindle housing and continuously circulated to take away heat for cooling. The heating of the motor mainly comprises the heating of copper loss of a stator winding and the heating of iron loss of a rotor, wherein the heating of the stator winding accounts for more than 2/3 of the total heating value of the motor. In the conventional cooling mode, only the stator part is cooled, but the iron loss heating part of the rotor is not cooled, namely, the heat which accounts for about 1/3 of the total heating amount of the motor is not cooled, so that external cold and internal heat is generated. The influence of the thermal expansion of the rotor on the machining accuracy is fatal, and if the shaft core of the main shaft is calculated according to the length of 500mm, the length of the main shaft is prolonged by 0.005mm every time the temperature of the shaft core rises by one degree according to the metal expansion coefficient of steel. In addition, under the action of the centrifugal force of the high-speed rotating main shaft, the cooling liquid for cooling the bearing cannot be distributed to the inner ring and the shaft core of the bearing at all, the pre-tightening amount of the bearing is increased along with the increase of the temperature of the main shaft, and the heating of the bearing is aggravated in turn, so that the bearing cannot be effectively cooled and lubricated. There is therefore a need for an improved cooling system for conventional high speed electric spindles. The prior art uses heat pipes to cool the shaft.

Japanese unexamined patent publication No. 2017-038489A (published: 2/16/2017), a heat collecting sleeve 2 is provided outside a stator 11, a ring groove 2a is provided on the outer periphery of the collecting sleeve 2, a heat collecting portion 3b of a heat pipe is wound in the ring groove 2a, and a heat radiating portion 3a is vertically connected upward to the heat collecting portion. The heat radiation portion 3a is externally provided with a plurality of heat radiation manifold pieces 7. The heat radiation manifold 7 and the heat radiation part 3a are covered in the heat radiation cover 5, two axial flow fans 6 are arranged on the top of the heat radiation cover 5, and wind is sucked from the two ends of the heat radiation cover 5 and is extracted from the axial flow fans 6. Two sets of heat pipes are provided around the entire outer circumference of the stator 11, and the heat collecting part 3b of each set of heat pipes extends over a half circumference and returns to the heat radiating part 3a extending axially vertically upward. A heat conductive resin 4 is provided between the ring groove 2a and the heat pipe. The heat is transferred to the heat radiation part 3a and the heat radiation manifold 7 from the heat collection part 3b by the working medium of the heat pipe, and the copper pipe is wound on the peripheral ring groove of the stator, so that the cooling structure is simplified, and the cooling cost is reduced. However, the method of carrying out the heat radiation portion 3a by air cooling is not preferable for the stator heat radiation in the hot air environment of high temperature in summer. In order to enable the working fluid to absorb heat at the lower part and enable the steam to go upwards, the heat collecting part 3b of the heat pipe is wound on the half circumference of the shaft, the heat radiation part 3a is vertically upwards, 90-degree axial bending is formed at the bottom of the half circumference of the shaft and the top of the heat collecting part 3b, the winding can be completed, and the bending greatly reduces the heat radiation efficiency of the heat pipe.

Korean UGINT major technology discloses a cooling system for a spindle of a machine tool (KR20100047381A, published: 5/10/2010), in which heat absorbing parts 30 of a plurality of heat pipes 40 are inserted into one end of a housing 20 at intervals, and a heat radiating part 50 is bent and inserted into a heat radiating sleeve 53 coaxially positioned outside the housing 20. Japanese NIKKISO corporation discloses a motor rotor cooling structure (JP hei 9-74716a, published: 1997, 3/18), in which a heat absorbing section 20a of a heat pipe 20 is inserted into one end of a rotor 14, a heat radiating section 20b of the heat pipe 20 is rotatably supported with a motor housing 10 and is disposed in a cooling jacket 21, the cooling jacket 21 has an inlet and an outlet, and the heat radiating section 20b is cooled by a liquid. The heat dissipation efficiency of above-mentioned structure is not good, and the former is because the heat dissipation section is buckled, and efficiency reduces greatly, and the latter is the optimum state when the motor is placed the use vertically, and other circumstances inefficiency.

In conclusion, a heat pipe heat exchange structure which maximally utilizes high heat conductivity of a heat pipe, is simplified in structure and low in cost is needed, and is a key problem which needs to be solved urgently in the field of high-speed electric spindles of lathes.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention aims to provide a high-speed and low-temperature electric spindle with simplified structure and low cost, which maximizes the utilization of the high thermal conductivity of the heat pipe.

The invention aims to realize the high-speed low-temperature electric spindle of the numerical control lathe, which comprises a motor shell, wherein the spindle is rotatably arranged on the motor shell through a bearing; comprises that

The heat transfer structure comprises an evaporator, a condenser and a liquid feed tank; the evaporator is communicated with the condenser through a steam pipe, a liquid outlet pipe of the condenser is communicated with a liquid feed tank, and the liquid feed tank is communicated with the evaporator through a backflow pipe; working fluid flows to the heat transfer structure;

the first heat dissipation is arranged on a front bearing sleeve and a rear bearing sleeve of the support main shaft, the first heat dissipation is static feed liquid evaporation, the static feed liquid evaporation comprises an annular liquid suction core, a copper foam ring, a gas collection chamber and a liquid collection chamber, and the annular liquid suction core is overlapped with the copper foam ring and is arranged on the bearing sleeves and communicated with the gas collection chamber and the liquid collection chamber;

the second heat dissipation is arranged in a shell cooling groove of the motor shell, the second heat dissipation is dynamic feed liquid evaporation, the dynamic feed liquid evaporation comprises a liquid feed ring, the liquid feed ring is fixedly connected with a second copper foam ring and a second liquid absorption core ring which are overlapped, and the liquid feed ring is rotatably arranged in the shell cooling groove;

the parallel path of the first heat sink and the second heat sink forms the evaporator.

Further, the first heat dissipation is replaced by the evaporation of the dynamic feed liquid.

Further, the bearing housing includes concave tooth heat transfer room, concave tooth heat transfer room is including preceding support ring tooth, the back support ring of locating the bearing housing periphery, and preceding support ring tooth, back support ring form annular groove, and annular wick, copper foam ring are located to the annular groove superpose, and annular wick butt annular groove bottom surface.

Furthermore, a liquid suction extension part and a foam extension part are integrally connected between the front support ring teeth of the annular liquid suction core and the foam copper ring, a tooth-shaped air collection channel is formed between the air collection chamber and the front support ring teeth, an annular space between the bearing sleeve and the air collection chamber forms an annular liquid feed channel, the tooth-shaped air collection channel is communicated with the air collection chamber, and the tooth-shaped liquid feed channel is communicated with the liquid collection chamber.

Further, the bearing sleeve comprises a bearing chamber, the bearing chamber comprises a positioning step, an inner oil sealing ring and an outer oil sealing ring cover which are integrally connected with the bearing sleeve in a bearing sleeve inner hole, the outer oil sealing ring cover comprises a jacking step, the bearing is arranged in the bearing sleeve inner hole until the outer ring abuts against the positioning step, and the outer oil sealing ring cover is arranged in the bearing sleeve inner hole in an interference manner until the jacking step abuts against the outer ring of the bearing.

Furthermore, a second liquid collecting ring chamber is formed between the liquid feeding ring and the shell cooling groove, and an arc-shaped groove is formed in the middle section of the inner wall of the liquid feeding ring.

Further, the outer wall of the liquid feeding ring is provided with a driving part, the driving part is a driven gear, the driven gear is meshed with a driving gear, and the driving gear is connected with a motor.

Further, the outer wall of the liquid feed ring is provided with a driving part, the driving part comprises a water worm wheel fixedly connected with the liquid feed ring, the water worm wheel is arranged in the vortex water channel, and water flow flowing continuously in the vortex water channel drives the water worm wheel to rotate slowly.

Furthermore, a water inlet is formed in one end of the vortex water channel, which is located at the highest point of the water turbine, clockwise rightwards, a water outlet is formed in the vortex water channel, which is located at the lowest point of the water turbine, clockwise leftwards, and the water inlet and the water outlet cover force application arc sections with at least 90-degree fan-shaped angles of the vortex water channel.

Furthermore, the water inlet is connected with a water source, the height from the water source through the plane of the water inlet is a working water head, hydraulic potential energy flowing into the vortex water channel is formed, and the height of the working water head is regulated and controlled according to the temperature of the bearing sleeve or the motor shell, so that the rotating speed of the water turbine is regulated.

The high-speed low-temperature motorized spindle of the numerical control lathe is characterized in that the evaporator is embedded in the bearing sleeve, so that the thermal resistance is reduced, the vortex water channel provides rotary power for the liquid feed ring and cools the motor shell or the bearing sleeve at the same time, the structure is simple, and the cooling effect is obviously enhanced.

Drawings

Fig. 1 is a front sectional view of a high-speed low-temperature motorized spindle of a numerically controlled lathe according to a first embodiment of the present invention.

Fig. 2 is a partially enlarged view I of fig. 1 of a first embodiment of the high-speed low-temperature motorized spindle of the numerical control lathe according to the present invention.

Fig. 3 is a sectional view a-a of fig. 1 illustrating a high-speed low-temperature motorized spindle of a numerically controlled lathe according to a first embodiment of the present invention.

Fig. 4 is a main sectional view of a second embodiment of the high-speed low-temperature motorized spindle of the numerical control lathe of the present invention.

FIG. 5 is a sectional view taken along line B-B of the second embodiment of the high-speed and low-temperature motorized spindle of the numerical control lathe according to the present invention.

Fig. 6 is another application example of the cross-sectional view B-B of the embodiment two of the high-speed low-temperature motorized spindle of the numerical control lathe of the present invention.

Reference numerals in the above figures:

10 motor shell, 11 stator, 12 rotor, 13 main shaft, 14 bearing, 15 bearing sleeve, 16 first heat radiation, 17 second heat radiation, 18 condensation shell, 19 fixed sleeve and 10.1 shell cold groove

20 heat transfer structure, 21 evaporator, 22 condenser, 23 liquid feed tank, 24 steam pipe, 25 return pipe, 26 working fluid, 22.1 condensation inlet pipe, 22.2 condensation outlet pipe

30 static feed liquid evaporation, 31 annular liquid suction cores, 32 foam copper rings, 33 liquid suction extension parts, 34 foam extension parts, 35 gas collection chambers, 36 tooth-shaped gas collection passages, 37 liquid collection chambers, 38 sealing covers and 39 annular feed liquid passages

35.1 fan-shaped air inlet, 35.2 air outlet nozzle and 37.1 annular liquid outlet

40 bearing chambers, 41 positioning steps, 42 outer sealing oil ring covers, 43 jacking steps, 42.1 sleeve ring parts and 42.2 flange parts

50 concave tooth heat exchange chamber, 51 front support ring tooth, 52 rear support ring, 53 annular groove, 54 support ring surface and 55 support tooth

60 motive feed liquid evaporation, 61 feed liquid ring, 62 arc-shaped groove, 63 fixing part, 64 second copper foam ring, 65 second liquid suction core ring, 66 driven gear, 67 second liquid collecting ring chamber, 67.1 second liquid inlet channel and 67.2 second air outlet nozzle

600 motive feed evaporation, 660 water turbine, 661 vortex water channel, 662 water inlet, 663 water outlet, 664 force application arc, 665 water source

70 countercurrent condensation, 71 condensation body, 72 sleeve body, 73 axial sleeve, 74 cover body, 75 spiral groove, 76 condensation pipe, 77 cooling liquid outlet pipe, 78 cooling liquid inlet pipe and 79 condensation pipe

Detailed Description

The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings, but is not intended to limit the scope of the invention.

Example 1

A high-speed low-temperature electric spindle of a numerical control lathe comprises a motor shell 10, a stator 11 is fixedly arranged in an inner hole of the motor shell 10, a rotor 12 and a spindle 13 are simultaneously and rotatably arranged, and the spindle 13 is rotatably provided with the motor shell 10 through a bearing 14. The bearing sleeve 15 is coaxially sleeved between the motor housing 10 and the bearing 14. The motor housing 10 is externally provided with a fixing sleeve 19 integrated with the spindle base.

The two bearing sleeves 15 are respectively provided with a first heat sink 16, and the motor housing 10 is provided with a second heat sink 17. The first heat sink 16 and the second heat sink 17 are each an external power free heat transfer structure 20 capable of circulating a working fluid 26 without providing external power to drive a compressor or the like. The heat transfer structure 20 comprises an evaporator 21, a condenser 22 and a liquid feed tank 23, and further comprises a steam pipe 24 and a return pipe 25 which are communicated with the evaporator 21 and the condenser 22. The evaporators 21 of the two first heat radiators 16 and the evaporator 21 of the second heat radiator 7 are connected in parallel to a steam pipe 24, the other end of the steam pipe 24 is connected with a condenser 22, and the condenser 22 is connected with a liquid feed tank 23 in series and then is communicated with the evaporators 21 through a return pipe 25. The working fluid 26 circulates in the heat transport structure 20 while undergoing a phase change as the heat transport structure operates. The working fluid 26 absorbs heat in the evaporator 21 and evaporates, flows through the steam pipe 23 to the condenser 22, dissipates heat in the condenser 22, condenses, and is stored in the feed tank 23, and the feed tank 23 flows back to the three evaporators 21 through the return pipes 24. The working fluid 26 may be water, chlorofluorocarbons, ammonia, fluorocarbons, and the like. For the convenience of description, the working fluid 21 in the liquid phase is referred to as "working fluid 26 a", and the working fluid 26 in the gas phase is referred to as "working vapor 26 b". The evaporator 21 is essentially a pump that drives the circulation of the working fluid 26. The evaporator 21 is formed by a parallel path of the two first and second heat sinks 16 and 17 of the front and rear bearing housings.

The bearing housing 15 comprises a bearing housing chamber 40 and a concave tooth heat exchange chamber 50, wherein the bearing housing chamber 40 comprises a positioning step 41, an inner oil seal ring 41 and an outer oil seal ring cover 42 which are integrally connected with the bearing housing in an inner hole of the bearing housing. The outer oil sealing ring cover 42 comprises a tightly-pushing step 43, the bearing is arranged in the inner hole of the bearing sleeve until the outer ring abuts against the positioning step 41, and the outer oil sealing ring cover 42 is arranged in the inner hole of the bearing sleeve in an interference manner until the tightly-pushing step 43 tightly pushes the outer ring of the bearing.

The concave tooth heat exchange chamber 50 is integrally arranged on the periphery of the bearing sleeve. Concave tooth heat transfer chamber 50 includes preceding support ring tooth 51, back support ring 52, forms annular groove 53 between preceding support ring tooth 51, the back support ring 52, and preceding support ring tooth 51 is including integrative locating a plurality of support teeth 55 that the bearing housing periphery interval set up, and is a plurality of the addendum face of support tooth forms support torus 54.

First heat dissipation 16 is for static feed liquid evaporation 30, static feed liquid evaporation 30 locates concave tooth heat transfer room 50, including overlapping annular wick 31 and the copper foam ring 32 in annular groove 53, annular wick 31 and copper foam ring 32 are equipped with imbibition extension 33 and foam extension 34 between support ring tooth 51, and imbibition extension 33 extends to the outer one section length L of preceding support ring tooth 51. An air collection chamber 35 is arranged close to the front support ring 51, and a tooth-shaped air collection channel 36 is formed between the air collection chamber 35 and the front support ring tooth 51 of the bearing sleeve 15. The air collection chamber 35 is provided with an annular air inlet 35.1 adjacent to the foam projection 34, and the foam projection 34 extends out of the front support ring 51 until entering the annular air inlet 35.1. The oil seal ring cover 42 comprises a collar part 42.1 extending axially and a flange part 42.2 extending outwards perpendicular to the axial direction, an annular liquid collecting chamber 37 is arranged in the flange part 42.2, and an annular space between the bearing sleeve 15 and the air collecting chamber 35 forms an annular liquid feeding channel 39. The annular liquid collection chamber 37 is provided with an annular liquid outlet 37.1, and the annular liquid outlet 37.1 is pressed into the annular liquid feed channel 39 and abuts against the liquid suction extension 33. The gas collection chamber 35 is formed by an annular plate, wherein a straight groove is arranged above the bearing sleeve, and two sides of the annular plate are sealed. The top of the gas collection chamber 35 is provided with a gas outlet nozzle 35.2, and the annular liquid collection chamber 37 is formed by welding a flange part 42.2 with a cavity inside to a collar part 42.1.

Phase change process of working fluid 26 by static feed evaporation 30: the working fluid 26a of the annular liquid-collecting chamber 37 seeps along the annular liquid-feeding channel 39 into the liquid-suction protrusion 33 and further into the liquid-suction core ring 31 and the copper foam ring 32, and gradually accumulates to fill at least the lower half annular groove 53. The working fluid 26a enters annular groove 53 slowly by capillary attraction of annular wick 31, and is therefore referred to as "static feed". The working fluid 26a of the wick ring 31 absorbs heat and is transformed into working vapor 26b, which enters the copper foam ring 32 of the upper half without the working fluid 26a from the annular groove 53 and enters the plenum chamber 35 through the foam extension 34 and the annular air inlet 35.1, and enters the steam pipe 23 through the air outlet nozzle 35.2. To ensure that the working fluid 26a also penetrates into the liquid-absorbing protrusion 33 along the highest point of the annular liquid-feeding channel 39, the liquid level of the working fluid in the liquid-feeding tank 23 is higher than or equal to the highest point of the annular liquid-feeding channel 39, so that the liquid pressure in the annular liquid-collecting chamber 37 continues to enter the annular liquid-collecting chamber 37 even if the liquid level reaches the highest point of the annular liquid-feeding channel 39.

The second heat dissipation 17 is a dynamic liquid feeding evaporation 60, the motor housing 10 is provided with a housing cooling groove 10.1, the dynamic liquid feeding evaporation 60 comprises a liquid feeding ring 61 which is rotatably arranged in the housing cooling groove 10.1, and a second liquid collecting ring chamber 67 is formed between the liquid feeding ring 61 and the housing cooling groove 17. Arc-shaped grooves 62 are formed in the middle section of the inner wall of the liquid feeding ring 61, fixing portions 63 are arranged at two ends of the inner wall of the liquid feeding ring 61, a second copper foam ring 64 and a second liquid absorption core ring 65 are fixedly stacked on the fixing portions 63, and the second liquid absorption core ring 65 abuts against the bottom surface 17a of the shell cold groove 10.1. The outer wall of the liquid feeding ring 61 is provided with a driving part, the driving part is a driven gear 66, the driven gear 66 is meshed with a driving gear 68, and the driving gear 68 is connected with a motor. The second liquid collecting ring chamber 67 is filled with the working fluid 26a at least partially below 1/3 the horizontal plane of the main shaft axis, and at the lowest part of the second liquid collecting ring chamber 67, the second wick ring 65 is located below the second copper foam ring 64 and is immersed in the working fluid 26 a. The driven gear 66 rotates the feed ring 61, and different portions of the second wick ring 65 are continuously rotated to the lowest portion of the second drip ring chamber 67 to be immersed in the working fluid 26a, so that the second wick ring 65 dynamically supplements the working fluid 26a, which is called "dynamic feeding". The lowest position of the motor shell 10 extends upwards to the bottom of the shell cooling groove 10.1 along the fixing flange, extends horizontally to enter the second liquid collecting ring chamber 67 and is provided with a second liquid inlet channel 67.1. The highest position of the motor shell 10 extends downwards along the fixed flange to the bottom of the shell cooling groove 10.1 and horizontally extends into the second liquid collecting ring chamber 67 to be provided with a second air outlet nozzle 67.2.

Phase change process of working fluid 26 of motive feed liquid vaporization 60: the working fluid 26a enters the second liquid collecting ring chamber 67 through the second liquid inlet channel 67.1 along the return pipe 25, the working fluid 26a is absorbed into the whole second liquid collecting ring 65 along with the continuous rotation of the second liquid collecting ring 65 in the second liquid collecting ring chamber 67 driven by the liquid feeding ring 61, and the working fluid 26a is changed into the working steam 26b through phase change and rises from the second liquid collecting ring chamber 67 along with the heat absorption of the second liquid collecting ring 65 until entering the steam pipe 24 through the second air outlet nozzle 67.2.

The tail part of the motor shell 10 is fixedly connected with a condensation shell 18. The upper part of the condensation shell 18 is provided with a condenser 22, the lower part is provided with a liquid feed tank 23, a steam pipe 24 is connected to a condensation inlet pipe 22.1 from the top of the condenser 22, the bottom of the condenser 22 is connected with a condensation liquid outlet pipe 22.2, the condensation liquid outlet pipe 22.2 is communicated with the top of the liquid feed tank 23, the bottom of the liquid feed tank 23 is connected with a liquid feed pipe, and the liquid feed tank is communicated with a return flow pipe 25.

The condenser 22 is a countercurrent condenser 70, the countercurrent condenser comprises a condenser body 71 and a sleeve body 72, the condenser body 71 comprises an axial sleeve 73 and a cover body 74, a spiral groove 75 is formed outside the axial sleeve 73, a condenser pipe 79 is spirally wound in the spiral groove 75 from top to bottom, and the sleeve body 72 is sleeved in the spiral groove 75 and is spirally fastened and connected with the cover body 74 to form a closed spiral channel 76. The top end of the condensing tube 79 is connected with the condensing inlet tube 22.1 from the top of the jacket body, and the bottom end of the condensing tube 76 penetrates out of the cover body to be communicated with the condensing liquid outlet tube 22.2. The bottom of the cover 74 is also provided with a cooling liquid inlet pipe 78, and the top of the sleeve body 72 is also provided with a cooling liquid outlet pipe 77. The flow direction of the cooling liquid in the spiral groove 75 is opposite to the gas flow direction in the condensation duct 76.

Example 2

The evaporator of the first heat radiation 16 is also changed into the power source of the second heat radiation 17 by evaporating the feed liquid, and the other structure is the same as that of embodiment 1.

A high-speed low-temperature electric spindle of a numerical control lathe is characterized in that a first heat radiation 16 and a second heat radiation 17 are respectively dynamic feed liquid evaporation 600, a second liquid collecting ring chamber 67 is formed between an annular groove 53 and a shaft hole of a motor shell, the driving part of the dynamic feed liquid evaporation 600 comprises a water turbine 660, the water turbine 660 is fixedly connected with the feed liquid ring 61, the water turbine 660 is arranged in the vortex water channel 661, as shown in the figure, one end of the vortex water channel 661 is provided with a water inlet 662 positioned at the highest point of the water turbine 660 clockwise and rightwards, the vortex water channel 661 is provided with a water outlet 663 positioned at the lowest point of the water turbine 660 clockwise and leftwards, the water inlet 662 and the water outlet 663 are shown to cover a force application arc segment 664 with at least a 90-degree fan-shaped angle of the vortex water channel 661, the rotating speed N of the water turbine 660 is finally obtained by designing the height between the plane of the corresponding water inlet 662 and the water source 665, namely the working water head H, the water volume per minute passing through the vortex water channel 661, namely the flow rate Q, the output N and the efficiency eta.

n＝9.81ηQH

Wherein n is the rotational speed of the water turbine 660, rpm (revolutions per minute), η is the efficiency, Q is the flow rate, m³/s。

The speed n of the water turbine 660 can be adjusted by digitally adjusting the height of the working head H in accordance with the temperature of the bearing housing.

The front support ring 51 is provided with a sealing cover 38 closely attached to the front support ring 51, the upper part and the lower part of the sealing cover 38 are respectively provided with an air collection chamber 35 and an oil collection chamber 37 which are independent of each other, the front support ring 51 is respectively provided with a vent hole for communicating the air collection chamber 35 with the annular groove 53, and a liquid feeding hole for communicating the oil collection chamber 37 with the annular groove 53.

The water turbines of the first heat sink 16 of both bearing sleeves 15 have the same first speed n1, and the water turbine 660 of the second heat sink 17 of the motor housing has a second speed n 2.

The water source 665 is filled with cooling liquid of the numerical control machine tool, the cooling liquid flowing out of the vortex water channel flows into a cooling liquid circulating system of the numerical control machine tool, and the cooling liquid returns to the water source 665 after being cooled. In this way, the low-temperature cooling liquid has the cooling effect through the vortex water channel.

Note that the fluid of the working head H pushes the water turbine in the vortex water channel 661 to rotate slowly, so as to supplement the absorption of the working fluid by each portion, and it is not necessary to seek a high rotation speed of the water turbine.

The application solves the technical problems of the heat pipe heat exchange structure which maximally utilizes the high heat conductivity of the heat pipe, has simplified structure and low cost through the following technical means,

(1) the concave tooth heat exchange chamber 50 realizes the integrated design of static feed liquid evaporation 30 in the bearing sleeve

The static feed liquid evaporator 30 is the evaporator of the loop heat pipe. The evaporator of the loop heat pipe in the prior art is a closed shell with a wick arranged therein, and is provided with an air path and a liquid path, a heat source is contacted with the shell to conduct heat, at least two thermal resistances are provided, namely a thermal resistance I between the heat source and the shell and a thermal resistance II between the shell and the wick, a front supporting ring tooth 51 and a rear supporting ring 52 are arranged on the periphery of a body of a bearing sleeve 15, and an annular groove 53 between the front supporting ring tooth 51 and the rear supporting ring 52 forms an annular closed concave tooth heat exchange chamber 50. The plurality of teeth of the front support ring teeth 51 support the shaft hole of the motor housing, while the tooth-shaped grooves between the plurality of teeth form a fluid feed passage and a gas collecting passage through the fluid suction protrusion 33 and the foam protrusion 34, so that the concave tooth heat exchange chamber 50 is an evaporator housing having both the working fluid 26a and the working gas 26b, and the bearing housing is a cooled body supported between the bearing and the motor housing, thereby eliminating at least the above-mentioned thermal resistance I and thermal resistance II.

By selecting the bearing sleeve 15 to be a red copper material, heat of the bearing outer ring can be conducted to the working fluid 26 with high heat conduction without heat resistance.

(2) The dynamic feed liquid evaporation solves the problem that the shaft parts are difficult to supplement working fluid to the top of the annular liquid suction core

For cooling shaft parts using loop heat pipes, the evaporator and wick are not typically designed as circular wicks, which make it difficult to replenish the top of the wick with working fluid. If the wick rotates, the working fluid can be easily supplied to each part of the wick ring. However, the rotation of the wick, which involves a driving mechanism, is complicated in structure, and the space of the bearing housing does not allow a mechanical driving mechanism, such as a gear, to be provided. Thus, it is a difficult problem to design a rotary drive with a simple structure and low power consumption.

The power source of the slow rotation of the liquid feeding ring 61 comes from the thrust of the water potential energy of the vortex water channel with the working water head H. And through the water worm wheel in the swirl water course, the water stream through the water potential energy of certain working water head drives the water worm wheel to rotate, has realized the rotation of feed liquid ring 61 ingeniously. And for the numerical control lathe, the continuous cooling liquid at the position of the working water head H is ensured, so that the machining cooling system of the machine tool spindle can be additionally realized.

(3) Vortex water channel 661 and liquid feed ring 61 cooperate to cool the motor housing or bearing housing

The vortex water channel and the second liquid collecting ring chamber are independent chambers which are sealed and isolated from each other, cooling liquid continuously flows in the vortex water channel and plays a role in continuously cooling the motor shell, and the inner hole of the motor shell 10 is reversely cooled by the bearing sleeve 15 through the support ring of the motor shell; meanwhile, the second liquid collecting ring chamber 67 is an evaporator, the liquid feeding ring 61 continuously rotates, the working fluid 26a is continuously sucked into the annular liquid sucking core, the annular liquid sucking core is abutted to the bottom ring surface of the annular groove, the working fluid 26a absorbs heat to become working gas 26b which continuously takes away the heat, cooling of the bearing sleeve is achieved, the working fluid and the working fluid complement each other, and the cooling effect is greatly enhanced.

The high-speed low-temperature motorized spindle of the numerical control lathe is characterized in that the evaporator is embedded in the bearing sleeve, so that the thermal resistance is reduced, the vortex water channel provides rotary power for the liquid feed ring and cools the motor shell or the bearing sleeve at the same time, the structure is simple, and the cooling effect is obviously enhanced.