Vertical direct-drive electric spindle cooling system

Abstract

The utility model discloses a vertical direct drive electric main shaft cooling system belongs to electric main shaft cooling technical field, include: stator, first end cover and second end cover who are connected with stator top and bottom respectively, wherein, after stator and the first end cover of top and the second end cover of bottom are connected, constitute the closed space, still include the rotor in the closed space in, and the cooling flow channel on stator, cooling sub flow channel on stator, the liquid injection sub flow channel and liquid discharge port that are located at both ends of cooling sub flow channel and are connected with cooling sub flow channel inside intercommunication, and the liquid injection port that is connected with the liquid injection sub flow channel far from cooling sub flow channel one end intercommunication, the liquid discharge port is located above cooling sub flow channel, and the liquid injection sub flow channel and liquid injection port are located below cooling sub flow channel, the utility model solves the technical problem that the machining precision is low because of thermal deformation, realizes the technical effect of improving the heat dissipation performance and guaranteeing the machining precision.

Description

Technical Field

[0001] This utility model relates to the field of electric spindle cooling technology, specifically to a vertical direct-drive electric spindle cooling system. Background Technology

[0002] In the field of high-precision CNC machining, thermal errors account for 60%–80% of the total machining errors, and the electric spindle, as a core functional component, directly determines the machining accuracy of the machine tool through its thermo-mechanical state.

[0003] The built-in motor and sealed housing structure cause copper loss, iron loss and bearing friction heat to accumulate mainly in the shaft-rotor system, resulting in local temperature rise and axial and radial thermal expansion. This changes the bearing preload and fit clearance, and then transmits the thermal deformation error to the tool center point (TCP), ultimately reducing machining accuracy. Utility Model Content

[0004] To solve the above problems, this utility model provides a vertical direct-drive electric spindle cooling system, including: a stator, a first end cover and a second end cover respectively connected to the top and bottom of the stator; wherein, the stator forms a closed space after being connected to the first end cover at the top and the second end cover at the bottom.

[0005] It also includes a rotor disposed in the enclosed space, and cooling channels disposed on the stator;

[0006] The cooling channel includes a cooling sub-channel on the stator, a liquid injection sub-channel and a liquid outlet located at both ends of the cooling sub-channel and connected to the interior of the cooling sub-channel, and a liquid injection port connected to the end of the liquid injection sub-channel away from the cooling sub-channel.

[0007] The drain outlet is located above the cooling sub-channel, and the injection sub-channel and injection outlet are located below the cooling sub-channel.

[0008] Preferably, the cooling sub-channel is spirally disposed in the stator.

[0009] Preferably, the injection subchannel is configured with a bend.

[0010] Preferably, it further includes: a first temperature sensor for acquiring the temperature of the coolant at the inlet of the cooling channel.

[0011] Preferably, it further includes: a second temperature sensor for acquiring the coolant temperature at the outlet of the cooling channel.

[0012] By adopting the above technical solution, this utility model mainly has the following technical effects:

[0013] By introducing coolant into the cooling channel in a low-in, high-out flow pattern to cool the electric spindle, the heat dissipation area is fully utilized. By spiraling the cooling sub-channel in the stator and bending the injection sub-channel, the residence time of the coolant and the heat dissipation area are increased, thus solving the technical problem of reduced machining accuracy caused by thermal deformation. This achieves the technical effect of improving heat dissipation performance and ensuring machining accuracy. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the cooling system of a vertical direct-drive electric spindle according to the present invention;

[0015] Figure 2 for Figure 1 Enlarged view of section A;

[0016] Figure 3 for Figure 1 Enlarged view of section B.

[0017] The meanings of the reference numerals in the attached figures are as follows:

[0018] 1. Stator;

[0019] 2. First end cap;

[0020] 3. Second end cap;

[0021] 4. Rotor;

[0022] 5. Cooling channel; 51. Cooling sub-channel; 52. Liquid injection sub-channel; 53. Liquid discharge port; 54. Liquid injection port. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] Please see Figures 1-3The first aspect of this utility model provides a vertical direct-drive electric spindle cooling system, including: a stator 1, a first end cover 2 and a second end cover 3 respectively connected to the top and bottom of the stator 1; wherein the stator 1, together with the first end cover 2 at the top and the second end cover 3 at the bottom, forms a closed space; the direct-drive electric spindle cooling system further includes a rotor 4 disposed in the closed space, and a cooling channel 5 disposed on the stator 1.

[0026] Furthermore, the stator 1, connected to the first end cover 2 and the second end cover 3, forms a sealed space, effectively preventing foreign objects from entering the interior of the direct-drive electric spindle cooling system. It also prevents mechanical collisions from damaging the internal structure of the direct-drive electric spindle cooling system, thus providing excellent protection. The stator 1 is the stationary fixed part of the direct-drive electric spindle cooling system, which generates a rotating magnetic field after current is applied. The rotor 4 is the rotating part of the direct-drive electric spindle cooling system, which rotates based on electromagnetic induction, receiving electromagnetic torque under the influence of the rotating magnetic field generated by the stator 1.

[0027] Furthermore, the rotor 4 is connected to the first end cover 2 and the second end cover 3 respectively through bearings, thereby using the first end cover 2 and the second end cover 3 to fix the rotor 4. In some embodiments, the first end cover 2 and the second end cover 3 are provided with a circular through hole in the center for the rotor 4 to pass through, so that the rotor 4 can extend out of the enclosed space through the circular through hole and connect with other transmission components or parts.

[0028] In some embodiments, the output end of the rotor 4 can be connected to a load such as a milling machine. By directly connecting the rotor 4 to the load, compared to connecting the milling machine to the motor via a gearbox, the power loss caused by the gearbox can be reduced. An exemplary power loss can be the energy lost by the gearbox during transmission due to internal friction, rotation, and vibration. This energy is dissipated in the form of heat, resulting in a decrease in mechanical efficiency.

[0029] In some embodiments, the cooling channel 5 is disposed in the stator 1, and the coolant absorbs heat from the stator 1, thereby cooling the stator 1 and reducing the internal temperature of the direct-drive electric spindle cooling system. This prevents thermal deformation of the stator 1 due to excessive temperature, which could affect the machining accuracy of the direct-drive electric spindle cooling system. For example, the coolant can be cooling oil, which has the characteristics of being locally non-magnetic, non-flammable, non-conductive, and having good thermal conductivity. Using cooling oil as the coolant has no impact on the magnetic circuit of the direct-drive electric spindle cooling system and results in higher heat dissipation efficiency.

[0030] In some embodiments, the cooling channel 5 includes a cooling sub-channel 51 disposed on the stator 1, a liquid injection sub-channel 52 and a liquid outlet 53 disposed at both ends of the cooling sub-channel 51 and communicating with the interior of the cooling sub-channel 51, and a liquid injection port 54 communicating with the end of the liquid injection sub-channel 52 away from the cooling sub-channel 51. In some embodiments, the liquid outlet 53 is located above the cooling sub-channel 51, and the liquid injection sub-channel 52 and the liquid injection port 54 are located below the cooling sub-channel 51. In some embodiments, the liquid injection sub-channel 52 is used to guide the coolant injected through the liquid injection port 54 into the cooling sub-channel 51. The above structure allows the coolant to enter the cooling channel 5 to cool the electric spindle in a low-in, high-out flow pattern. On the one hand, the coolant continuously pushes the air towards the liquid outlet 53, avoiding air blockage and cavitation, ensuring that the channel is always full of liquid, and ensuring that the heat dissipation area is 100% utilized. On the other hand, it can also match the heat load according to the temperature gradient, forming synergistic benefits in terms of thermo-mechanical performance, energy consumption, and reliability.

[0031] In some more preferred embodiments, the cooling sub-channel 51 is spirally disposed in the stator 1, and the liquid injection sub-channel 52 is bent. The above design can increase the residence time of the coolant in the cooling system on the one hand, and effectively increase the heat dissipation area on the other hand, thereby improving the heat dissipation performance.

[0032] In some embodiments, the direct-drive electric spindle cooling system further includes: a first temperature sensor located near the injection port 54 for acquiring the coolant temperature at the inlet of the cooling channel, and a second temperature sensor located near the drain port 53 for acquiring the coolant temperature at the outlet of the cooling channel. By timely acquiring the coolant temperature at the inlet and outlet of the cooling channel, the operator can adjust the coolant flow rate accordingly to further enhance heat dissipation performance. For example, the coolant flow rate can be increased when the coolant temperature at the outlet of the cooling channel is too high.

[0033] Finally, it should be noted that the embodiments disclosed in this utility model are merely preferred embodiments of this utility model and are only used to illustrate the technical solutions of this utility model, not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A vertical direct-drive electric spindle cooling system, characterized in that, include: The stator includes a first end cap and a second end cap connected to the top and bottom of the stator, respectively; wherein the stator, together with the first end cap at the top and the second end cap at the bottom, forms a closed space. It also includes a rotor disposed in the enclosed space, and cooling channels disposed on the stator; The cooling channel includes a cooling sub-channel on the stator, a liquid injection sub-channel and a liquid outlet located at both ends of the cooling sub-channel and connected to the interior of the cooling sub-channel, and a liquid injection port connected to the end of the liquid injection sub-channel away from the cooling sub-channel. The drain outlet is located above the cooling sub-channel, and the injection sub-channel and injection outlet are located below the cooling sub-channel.

2. The vertical direct-drive electric spindle cooling system according to claim 1, characterized in that, The cooling sub-channel is spirally disposed in the stator.

3. The vertical direct-drive electric spindle cooling system according to claim 1, characterized in that, The injection sub-channel is bent.

4. The vertical direct-drive electric spindle cooling system according to claim 1, characterized in that, Also includes: The first temperature sensor is used to obtain the temperature of the coolant at the inlet of the cooling channel.

5. A vertical direct-drive electric spindle cooling system according to claim 1, characterized in that, Also includes: The second temperature sensor is used to obtain the temperature of the coolant at the outlet of the cooling channel.

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