Vertical electric spindle circulating cooling system

Abstract

The utility model discloses a vertical electric spindle circulating cooling system, which belongs to the technical field of electric spindle cooling and comprises a stator, a first end cover and a second end cover. Wherein the stator is connected with the first end cover and the second end cover to form a closed space; the motor further comprises a rotor arranged in the closed space, a first cooling flow channel penetrating through the first end cover and a second cooling flow channel penetrating through the second end cover. The first circulating flow channel is connected with the first cooling flow channel, the second circulating flow channel is connected with the second cooling flow channel, and the cooling device is connected with the first circulating flow channel and the second circulating flow channel. The technical problem that the circulating cooling effect of the vertical electric spindle is poor is solved, the machining precision and stability of the vertical electric spindle are improved, and the technical effect of fully cooling the vertical electric spindle is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric spindle cooling, in particular to a vertical electric spindle circulating cooling system. Background Art

[0002] In modern mechanical manufacturing, thermal deformation causes up to 50% of errors, and this proportion is particularly high in high-speed, high-precision machining, reaching 60% to 80%. As a key component of high-speed, high-precision CNC machine tools, the performance of the electric spindle directly affects the machining accuracy of the machine tools. Because the electric spindle motor is built-in and the housing is enclosed, the heat generated by the motor power loss and the heat generated by the friction of the front and rear bearings cannot be effectively and promptly dissipated. Instead, a large amount of heat accumulates in the shaft core rotor, causing the shaft core bearing rotor to expand due to heat, resulting in severe thermal deformation, changing the fit clearance between the original components, and the resulting errors are superimposed on the machining center point (TCP), ultimately reducing the machining accuracy of the electric spindle.

[0003] Traditional electric spindles usually use coolant (water or oil) to circulate and cool the motor stator and electric spindle housing. However, the traditional cooling system has poor cooling effect and easily affects the machining accuracy and stability of the electric spindle. Utility Model Content

[0004] To solve the above problems, the first aspect of the present invention provides a vertical electric spindle circulating cooling system, comprising: a stator, a first end cover and a second end cover respectively connected to the stator;

[0005] Wherein, the stator is connected with the first end cover and the second end cover to form a closed space;

[0006] Also included is a rotor disposed in the enclosed space, a first cooling channel disposed through the first end cover, and a second cooling channel disposed through the second end cover;

[0007] A first circulation channel connected to the first cooling channel, a second circulation channel connected to the second cooling channel, and a cooling device connected to the first circulation channel and the second circulation channel.

[0008] In some embodiments, the first cooling channel includes: a first cooling sub-channel, and a second cooling sub-channel connected to the first cooling sub-channel;

[0009] The first cooling sub-channel is arranged to pass through the first end cover and is used to introduce external cooling liquid into the closed space; the second cooling sub-channel is an annular structure, and a through hole is provided at the bottom thereof.

[0010] In some embodiments, the first end cover includes: a first sealing ring, a first sealing ring is further provided on the first sealing ring, and the first sealing ring and the first sealing ring are sleeved on the rotor.

[0011] In some embodiments, the second end cover includes: a second sealing ring, and a third sealing ring, the third sealing ring is sleeved on the rotor, and the second sealing ring is adapted to the third sealing ring.

[0012] In some embodiments, a first annular structure is provided on the top of the second sealing ring, a second annular structure is provided on the bottom of the third sealing ring, and the second annular structure is sleeved on the outer circumference of the first annular structure;

[0013] In some embodiments, the vertical electric spindle cooling system further includes: a third end cover connected to the stator,

[0014] The third end cover is provided with a receiving groove and a third cooling channel connected to the receiving groove;

[0015] A second sealing ring is further provided at the connection between the third end cover and the second end cover.

[0016] In some embodiments, the second circulation channel is connected to the third cooling channel for receiving the cooled coolant discharged from the third cooling channel and introducing the cooled coolant into the cooling device.

[0017] In some embodiments, the cooling device is provided with an extraction pump, and the extraction pump is connected to the first circulation channel.

[0018] By adopting the above technical solution, the utility model mainly has the following technical effects:

[0019] The utility model provides a first cooling channel to introduce the coolant into the cooling system of the vertical electric spindle, provides a second cooling channel to discharge the coolant, and introduces the cooled coolant into the cooling device through the second circulation channel for cooling, and then re-extracts the cooled coolant into the first circulation channel and then enters the first cooling channel, thereby solving the technical problem of poor circulation cooling effect of the vertical electric spindle, improving the machining accuracy and stability of the vertical electric spindle, and achieving the technical effect of fully cooling the vertical electric spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a cooling schematic diagram of a vertical electric spindle circulation cooling system of the utility model;

[0021] Figure 2 This is a (partial) cooling schematic diagram of a vertical electric spindle circulation cooling system of the utility model;

[0022] Figure 3 for Figure 2 Enlarged view of part A;

[0023] Figure 4 for Figure 2 Enlarged view of part B;

[0024] Figure 5 for Figure 4 Magnified view of part C.

[0025] The meanings of the reference numerals are as follows:

[0026] 1. Stator;

[0027] 2. First end cover; 21. First sealing ring; 22. First sealing ring;

[0028] 3. Second end cover; 31. Second sealing ring; 311. First annular structure; 32. Third sealing ring; 321. Second annular structure;

[0029] 4. rotor; 41. rotating shaft; 42. fixing groove;

[0030] 5. First cooling channel; 51. First cooling sub-channel; 52. Second cooling sub-channel;

[0031] 6. Second cooling channel;

[0032] 7. Third end cover; 71. Accommodation groove; 72. Third cooling channel; 73. Second sealing ring;

[0033] 8. First circulation channel;

[0034] 9. Second circulation channel;

[0035] 10. Cooling device; 101. Extraction pump. DETAILED DESCRIPTION

[0036] In order to help those skilled in the art better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the specification of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0037] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] See also Figure 1-Figure 5 The utility model provides a vertical electric spindle circulating cooling system, comprising: a stator 1, a first end cover 2 and a second end cover 3 connected to the top and bottom of the stator 1 respectively; wherein, the stator 1 is connected to the first end cover 2 at the top and the second end cover 3 at the bottom to form a closed space; the electric spindle cooling system also includes a rotor 4 arranged in the closed space, a first cooling channel 5 provided through the first end cover 2, a second cooling channel 6 provided through the second end cover 3, a first circulating channel 8 connected to the first cooling channel 5, a second circulating channel 9 connected to the second cooling channel 6, and a cooling device 10 connected to the first circulating channel 8 and the second circulating channel 9.

[0039] Furthermore, the stator 1, when connected to the first end cover 2 and the second end cover 3, forms a sealed space, effectively preventing foreign matter from entering the interior of the vertical electric spindle cooling system and preventing mechanical collisions from damaging the internal structure of the vertical electric spindle cooling system, thereby providing excellent protection. The stator 1 is the stationary, fixed portion of the vertical electric spindle cooling system, capable of generating a rotating magnetic field when current is applied; the rotor 4 is the rotating portion of the vertical electric spindle cooling system, capable of generating electromagnetic torque and rotating due to the rotating magnetic field generated by the stator 1, based on electromagnetic induction.

[0040] Furthermore, the rotor 4 is connected to the first end cover 2 and the second end cover 3 respectively via bearings, thereby utilizing the first end cover 2 and the second end cover 3 to secure the rotor 4. In some embodiments, a stepped fixing groove 42 is provided on the rotating shaft 41 of the rotor 4. The rotating shaft 41 is connected to the bearing via the fixing groove 42, thereby preventing the bearing from shifting along the rotating shaft 41 during operation of the vertical electric spindle cooling system. In addition, a circular through-hole is provided in the center of each of the first end cover 2 and the second end cover 3, through which the rotor 4 can pass. This allows the rotor 4 to extend out of the enclosed space through the circular through-hole and connect to other transmission components or parts.

[0041] In some embodiments, the output end of the rotor 4 can be connected with a load such as a milling machine. By directly connecting the rotor 4 with the load, compared with connecting the milling machine with the motor through a gear box, the power loss caused by the gear box can be reduced. The exemplary power loss can be the energy lost by the gear box due to internal friction, rotation and vibration during transmission, which is dissipated in the form of heat energy, thereby causing the mechanical efficiency to decrease.

[0042] Further, the first cooling flow channel 5 is arranged through the first end cover 2. In some embodiments, the first cooling flow channel 5 is used to introduce cooling liquid into the closed space, and the cooling liquid absorbs the heat on the stator 1 and / or the rotor 4, thereby cooling the stator 1 and / or the rotor 4, and further reducing the temperature inside the vertical motor spindle, avoiding the influence of the machining precision of the vertical motor spindle caused by the thermal deformation of the stator 1 and / or the rotor 4 due to the high temperature. On the other hand, by improving the machining precision and stability of the rotor 4 during operation, the machining precision and stability of the vertical motor spindle can be improved. Exemplarily, the cooling liquid can be cooling oil, which has the characteristics of local non-magnetic, non-flammable, non-conductive and good heat conduction. Using cooling oil as cooling liquid has no influence on the magnetic circuit of the motor spindle cooling system, and the heat dissipation efficiency is higher.

[0043] In some embodiments, the first cooling flow channel 5 includes a first cooling sub-flow channel 51 and a second cooling sub-flow channel 52 connected with the first cooling sub-flow channel 51. The first cooling sub-flow channel 51 is arranged through the first end cover 2 and used to introduce external cooling liquid into the closed space. The second cooling sub-flow channel 52 has an annular structure and is provided with a through hole at the bottom. The cooling liquid entering the first cooling flow channel 5 first enters the second cooling sub-flow channel 52 through the first cooling sub-flow channel 51, and then is dispersed into the closed space through the through hole in the second cooling sub-flow channel 52 to contact the stator 1 and / or the rotor 4, thereby cooling the stator 1 and / or the rotor 4 in the closed space.

[0044] Further, the second cooling flow channel 6 is arranged through the second end cover 3. In some embodiments, the second cooling flow channel 6 is used to guide the cooling liquid after cooling the stator 1 and / or the rotor 4 in the closed space out, thereby realizing the circulating cooling process of the cooling liquid.

[0045] In some embodiments, the first end cover 2 further includes a first sealing ring 21 connected with the first end cover 2. The first sealing ring 21 is further provided with a first sealing ring 22, and the first sealing ring 21 and the first sealing ring 22 are sleeved on the rotor 4 to enhance the sealing performance of the connection between the first end cover 2 and the rotor 4.

[0046] In some embodiments, the second end cover 3 further includes: a second sealing ring 31, which is connected to the second end cover 3; and a third sealing ring 32, which is sleeved on the rotor 4. The second sealing ring 31 is adapted to the third sealing ring 32 to enhance the sealing performance at the connection between the second end cover 3 and the rotor 4.

[0047] In some more preferred embodiments, a first annular structure 311 is provided on the top of the second sealing ring 31, and a second annular structure 321 is provided on the bottom of the third sealing ring 32, and the second annular structure 321 is sleeved on the outer periphery of the first annular structure 311; by designing the second annular structure 321 to be sleeved on the first annular structure 311, when the vertical electric spindle cooling system is working, the coolant will move downward along the second annular structure 321, thereby preventing the coolant from entering the connection between the second end cover 3 and the rotor 4, thereby enhancing the sealing of the connection between the second end cover 3 and the rotor 4.

[0048] Furthermore, the vertical electric spindle cooling system also includes: a third end cover 7 connected to the stator 1. In some embodiments, the third end cover 7 is provided with an annular receiving groove 71 and a third cooling channel 72 connecting the receiving groove 71 with the outside; wherein, the receiving groove 71 is provided below the second cooling channel 6 for receiving the cooled coolant discharged from the second cooling channel 6; it should be noted that the cooled coolant refers to the coolant after cooling the stator 1 and / or the rotor 4, and the third cooling channel 72 is used to discharge the cooled coolant in the receiving groove 71 to the external structure of the vertical electric spindle cooling system.

[0049] In some more preferred embodiments, a second sealing ring 73 is further provided at the connection between the third end cover 7 and the second end cover 3 to enhance the sealing performance of the connection between the third end cover 7 and the second end cover 3 .

[0050] Furthermore, the second circulation channel 9 is connected to the third cooling channel 72, and is used to receive the cooled coolant discharged from the third cooling channel 72 and introduce it into the cooling device 10. In this embodiment, the cooled coolant refers to the coolant after cooling the stator 1 and / or rotor 4.

[0051] In some embodiments, the cooling device 10 is used to receive the cooled coolant in the second circulation channel 8 and cool it down. The cooling method can be but is not limited to using a compressor to cool the coolant, or using a fan and a radiator to cool the coolant.

[0052] Furthermore, the cooling device 10 is provided with an extraction pump 101, which is connected to the first circulation channel 8 and is used to re-extract the coolant after cooling the cooling device 10 into the first circulation channel 8, and then enter the first cooling channel 5, thereby realizing circulating cooling of the vertical electric spindle.

[0053] Finally, it should be noted that the embodiments disclosed in the present invention are only preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A vertical electric spindle circulation cooling system, characterized in that: include: a stator, a first end cover and a second end cover respectively connected to the stator; Wherein, the stator is connected with the first end cover and the second end cover to form a closed space; Also included is a rotor disposed in the enclosed space, a first cooling channel disposed through the first end cover, and a second cooling channel disposed through the second end cover; A first circulation channel connected to the first cooling channel, a second circulation channel connected to the second cooling channel, and a cooling device connected to the first circulation channel and the second circulation channel.

2. A vertical electric spindle circulating cooling system according to claim 1, characterized in that: The first cooling channel includes: a first cooling sub-channel, and a second cooling sub-channel connected to the first cooling sub-channel; The first cooling sub-channel is arranged to pass through the first end cover and is used to introduce external cooling liquid into the closed space; the second cooling sub-channel is an annular structure, and a through hole is provided at the bottom thereof.

3. A vertical electric spindle circulating cooling system according to claim 1, characterized in that: The first end cover includes: a first sealing ring, a first sealing ring is further provided on the first sealing ring, and the first sealing ring and the first sealing ring are sleeved on the rotor.

4. A vertical electric spindle circulating cooling system according to claim 3, characterized in that: The second end cover includes: a second sealing ring and a third sealing ring. The third sealing ring is sleeved on the rotor. The second sealing ring is adapted to the third sealing ring.

5. A vertical electric spindle circulating cooling system according to claim 4, characterized in that: A first annular structure is provided on the top of the second sealing ring, and a second annular structure is provided on the bottom of the third sealing ring. The second annular structure is sleeved on the outer circumference of the first annular structure.

6. A vertical electric spindle circulating cooling system according to claim 5, characterized in that: Also includes: a third end cover connected to the stator, The third end cover is provided with a receiving groove and a third cooling channel connected to the receiving groove; A second sealing ring is further provided at the connection between the third end cover and the second end cover.

7. A vertical electric spindle circulating cooling system according to claim 6, characterized in that: The second circulation channel is connected to the third cooling channel and is used to receive the cooled coolant discharged from the third cooling channel and introduce it into the cooling device.

8. The vertical electric spindle circulating cooling system according to claim 1, characterized in that: The cooling device is provided with an extraction pump, and the extraction pump is connected to the first circulation channel.

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