WO2024077924A1

WO2024077924A1 - Embedded vapor chamber-based u-shaped linear motor heat dissipation apparatus

Info

Publication number: WO2024077924A1
Application number: PCT/CN2023/090425
Authority: WO
Inventors: 尹树彬; 汤勇; 黄皓熠; 张仕伟; 赵威; 黎洪铭; 黄梓滨; 余小媚
Original assignee: 广东畅能达科技发展有限公司
Priority date: 2022-10-14
Filing date: 2023-04-24
Publication date: 2024-04-18
Also published as: CN115549394A

Abstract

Provided is an embedded vapor chamber-based U-shaped linear motor heat dissipation apparatus, comprising a vapor chamber (1), two windings (2) and a motor base (3), wherein the motor base (3) is provided with a U-shaped groove (4) thereon and is internally provided with a cooling water channel (5), the U-shaped groove (4) is provided with an insertion slot (6) for inserting the vapor chamber (1), the two windings (2) are respectively located on the left side and the right side in the U-shaped groove (4), the vapor chamber (1) is located between the two windings (2), a bottom end of the vapor chamber (1) fits into the insertion slot (6), a top end of the vapor chamber (1) is an evaporation end (11) for absorbing heat, the bottom end of the vapor chamber (1) is a condensation end (12) for releasing heat, the evaporation end (11) is attached to the windings (2), the cooling water channel (5) is located below the U-shaped groove (4), and the cooling water channel (5) penetrates through the motor base (3). The heat dissipation efficiency and the average heat distribution of a U-shaped linear motor can be improved, the operation efficiency of the U-shaped linear motor is improved, and there are wide development prospects in the field of linear motor heat dissipation.

Description

Heat dissipation device based on U-shaped linear motor with embedded heat sink

Technical Field

The invention relates to the field of motor heat dissipation, and in particular to a heat dissipation device based on a U-shaped linear motor embedded with a heat spreader.

Background technique

With the continuous development of the times, the automated manufacturing industry has gradually introduced high-efficiency linear transmission modules. Linear modules include linear motors and controllers. Linear motors have the characteristics of high precision, long stroke, high load and high speed.

The heat of linear motors mainly comes from the ohmic heat generated when the windings are working. Based on the current U-shaped linear motor winding structure, the heat generated needs to be transferred from the top of the winding to the bottom, and then transferred to the water-cooled base through the insulation layer, and finally the heat is transferred to the cooling water to achieve heat dissipation. However, the heat dissipation path is long and the thermal resistance is large, resulting in low heat dissipation efficiency. Heat is easy to accumulate during the long-term operation of the linear motor, and even "burning" phenomenon may occur. At the same time, when the internal temperature of the motor is high, its insulation life decreases accordingly, and other mechanical properties such as the strength and hardness of the metal parts will also decrease, thereby seriously reducing the operating life of the motor and affecting its safety. In addition, when the linear motor is used on a processing machine tool, the heating of the winding will cause the casing of the linear motor to undergo thermal deformation, and the slight deformation will greatly reduce the processing accuracy of the machine tool. In summary, it is difficult to remove the heat generated by the winding in time, which will cause the operating efficiency of the linear motor to deteriorate.

Summary of the invention

In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose a heat dissipation device based on a U-shaped linear motor with an embedded heat spreader, which can improve the heat dissipation efficiency of the U-shaped linear motor, average heat distribution, and improve the operating efficiency of the U-shaped linear motor.

To achieve this object, the present invention adopts the following technical solutions:

The present invention provides a heat dissipation device based on a U-shaped linear motor with an embedded heat spreader, comprising a heat spreader, two windings and a motor base. The motor base is provided with a U-shaped groove and a cooling water channel inside. The U-shaped groove is provided with a slot for inserting the heat spreader. The two windings are respectively located on the left and right sides of the U-shaped groove. The heat spreader is located between the two windings. The bottom end of the heat spreader is engaged with the slot. The upper end of the heat spreader is an evaporation end that absorbs heat, and the bottom end of the heat spreader is a condensation end that releases heat. The evaporation end is attached to the winding, and the cooling water channel is located below the U-shaped groove, and the cooling water channel runs through the motor base.

A preferred technical solution of the present invention is that the number of cooling water channels is more than two, the cooling water channels are I-shaped and arranged in parallel, and the slots are located between adjacent cooling water channels.

The preferred technical solution of the present invention is that it also includes a plurality of bent pipe members, which are located on the same side of the motor base, and the cooling water channel includes a left cooling water channel and a right cooling water channel, the left cooling water channel is located on the left side of the slot, and the right cooling water channel is located on the right side of the slot, the number of the bent pipe members, the left cooling water channel and the right cooling water channel is the same, and the two ends of the bent pipe member are respectively connected to the end of the left cooling water channel and the end of the right cooling water channel.

The preferred technical solution of the present invention is that the cooling water channel is U-shaped, and the cooling water channel includes an inlet section, an outlet section and a connecting section. The two ends of the connecting section are respectively connected to the inlet section and the outlet section, and the slot is located between the inlet section and the outlet section.

The preferred technical solution of the present invention is that more than two cooling water channels are provided, the cooling water channels are arranged in a sleeve-connected manner, the water inlet sections are all located on the left side of the slot, and the water outlet sections are all located on the right side of the slot.

The preferred technical solution of the present invention is that more than two cooling water channels are provided, the connecting sections are all straight, the connecting sections are interconnected, the water inlet sections are all located on the left side of the slot, and the water outlet sections are all located on the right side of the slot.

A preferred technical solution of the present invention is that the cross section of the cooling water channel is square.

A preferred technical solution of the present invention is that a heat conducting layer is provided between the evaporation end and the winding, and between the condensation end and the slot.

A preferred technical solution of the present invention is that the material of the heat-conducting layer is heat-conducting glue or heat-conducting mud.

A preferred technical solution of the present invention is that the heat spreader is a copper-based heat spreader or an aluminum-based heat spreader.

Beneficial effects of the present invention:

The present invention proposes a heat dissipation device based on a U-shaped linear motor embedded with a heat spreader. By embedding a heat spreader between the windings, an additional heat transfer path is added to guide the heat to the cooling water channel of the motor base, so that the cooling water channel can more effectively take away the heat generated by the windings through the heat spreader. Based on the heat transfer mechanism of the heat spreader, it needs to have a sufficient contact area with the water cooling module to exert its high thermal conductivity. The setting of the slot can not only play the role of fixing the heat spreader, but also increase the contact area of the heat spreader, and make it closer to the U-shaped cooling water channel to reduce the distance of heat conduction. The heat dissipation device can significantly improve the heat dissipation of the windings of the linear motor, reduce the temperature of the motor copper wire winding, increase the rated power of the motor, and realize the lightweight and miniaturization of the motor. The linear motor can still achieve the purpose of rapid heat dissipation in a high-power working environment, evenly distribute heat, avoid the phenomenon of "burning" and "thermal deformation of the casing", thereby improving the operating efficiency. In addition, the heat dissipation device has a simple structure, low assembly requirements, and low precision requirements for the components involved, easy processing, and low overall cost.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

FIG1 is a three-dimensional view of a heat dissipation device based on a U-shaped linear motor embedded with a heat spreader according to Embodiment 1;

FIG2 is a front view of a heat dissipation device based on a U-shaped linear motor embedded with a heat spreader according to the first embodiment;

FIG3 is a top view of a heat dissipation device based on a U-shaped linear motor embedded with a heat spreader according to the first embodiment;

FIG4 is a perspective view of the motor base of the first embodiment;

FIG5 is a front view of the motor base of the first embodiment;

Fig. 6 is a cross-sectional view along line A-A in Fig. 5;

FIG7 is a perspective view of a heat dissipation device based on a U-shaped linear motor embedded with a heat spreader according to the second embodiment;

FIG8 is a second perspective view of the heat dissipation device based on the embedded heat spreader type U-shaped linear motor according to the second embodiment;

FIG9 is a top view of a heat dissipation device based on a U-shaped linear motor embedded with a heat spreader according to Embodiment 2;

FIG10 is a perspective view of a curved pipe member of the second embodiment;

FIG11 is a three-dimensional view of a heat dissipation device based on a U-shaped linear motor embedded with a heat spreader according to Embodiment 3;

FIG12 is a front view of a heat dissipation device based on a U-shaped linear motor embedded with a heat spreader according to Embodiment 3;

FIG13 is a top view of a heat dissipation device based on a U-shaped linear motor embedded with a heat spreader according to Embodiment 3;

FIG14 is a perspective view of the motor base of the third embodiment;

FIG15 is a front view of the motor base of the third embodiment;

Fig. 16 is a cross-sectional view along line A-A in Fig. 15;

FIG17 is a perspective view of a heat dissipation device based on a U-shaped linear motor embedded with a heat spreader according to a fourth embodiment;

FIG18 is a perspective view of the motor base of the fourth embodiment;

FIG19 is a cross-sectional view along line A-A in FIG18.

In the figure:
1-heat sink; 11-evaporation end; 12-condensation end; 2-winding; 3-motor base; 4-U-shaped slot;
5-cooling water channel; 51-left cooling water channel; 52-right cooling water channel; 510-water inlet section; 520-water outlet section; 530-connecting section; 6-slot; 7-bent pipe fitting.

Detailed ways

The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

Embodiment 1

As shown in Figures 1-6, a heat dissipation device based on a U-shaped linear motor embedded in a heat spreader is provided in this embodiment, including a heat spreader 1, two windings 2 and a motor base 3. The motor base 3 is provided with a U-shaped groove 4 and a cooling water channel 5 inside. The U-shaped groove 4 is provided with a slot 6 for inserting the heat spreader 1, and the slot is located in the middle of the U-shaped groove 4. The two windings 2 are respectively located on the left and right sides of the U-shaped groove 4, and the shape and size of the bottom of the winding 2 match the shape and size of the U-shaped groove 4. The heat spreader 1 is located between the two windings 2, the bottom end of the heat spreader 1 is embedded in the slot 6, the upper end of the heat spreader 1 is an evaporation end 11 that absorbs heat, and the bottom end of the heat spreader 1 is a condensation end 12 that releases heat. The evaporation end 11 is closely attached to the windings 2 on both sides, and the cooling water channel 5 is I-shaped and located below the U-shaped groove 4. The cooling water channel 5 runs through the motor base 3. In this embodiment, the heat spreader 1 is an ultra-thin heat spreader. Specific method: A slot 6 for embedding the heat spreader 1 and an I-shaped cooling water channel 5 are processed on the motor base by milling or deep hole drilling. The length of the motor base is basically close to the length of the winding 2.

Preferably, the number of cooling water channels 5 is more than two, the cooling water channels 5 are arranged in parallel, and the slots 6 are located between adjacent cooling water channels 5. In this structure, the I-type cooling water channel can fully remove the heat brought from the winding by the heat spreader 1. In this embodiment, the number of cooling water channels 5 is four, and the cooling water channels 5 are evenly distributed on both sides of the slots 6. The cross-section of the cooling water channel 5 is circular, and its diameter is 4 mm.

Preferably, the heat spreader 1 is a copper-based heat spreader or an aluminum-based heat spreader. In this embodiment, the heat spreader 1 is a copper-based heat spreader. A heat sink 1 is provided inside the heat spreader 1. The heat sink is deionized water with a resistivity of 18.2MΩ*cm. The internal vacuum degree after vacuum treatment is 7Pa. After condensation, the heat sink returns to the evaporation end through the capillary action of the wick for the second stage of heat transfer, realizing a thermal cycle inside the system.

The heat dissipation device of this embodiment embeds an ultra-thin heat spreader with high thermal conductivity between the windings, and adds an additional heat transfer path to guide the heat to the parallel I-type cooling water channels of the motor base. The I-type cooling water channel design and processing are simple, and multiple cooling water channels can be designed to increase the contact area of heat transfer. When the heat dissipation device is working, the external cooling water enters the I-type cooling water channel through the same side of the motor base. The I-type cooling water channel takes away the heat from the vapor chamber and flows out from the other side of the motor base, circulating continuously to achieve efficient longitudinal heat conduction and improve motor performance. Based on the heat transfer mechanism of the vapor chamber, it needs to have sufficient contact area with the water cooling module to exert its high thermal conductivity. The slot setting can not only fix the vapor chamber, but also increase the contact area of the vapor chamber and make it closer to the I-type cooling water channel.

Embodiment 2

As shown in Fig. 7-10, the structure of this embodiment is basically the same as that of the first embodiment, except that: it also includes a plurality of curved pipe members 7, which are located on the same side of the motor base 3, and the cooling water channel 5 includes a left cooling water channel 51 and a right cooling water channel 52, the left cooling water channel 51 is located on the left side of the slot 6, and the right cooling water channel 52 is located on the right side of the slot 6, and the number of curved pipe members 7, left cooling water channels 51 and right cooling water channels 52 is the same. The two ends of the curved pipe member 7 are connected to the end of the left cooling water channel 51 and the end of the right cooling water channel 52, respectively. In this example, the number of curved pipe members 7, left cooling water channels 51 and right cooling water channels 52 is two each, one of the curved pipe members 7 connects the end of the outer left cooling water channel 51 and the end of the outer right cooling water channel 52, and the other curved pipe member 7 connects the end of the inner left cooling water channel 51 and the end of the inner right cooling water channel 52.

Preferably, the material of the curved pipe member 7 is a metal material or a polymer material. The metal material can be copper, copper alloy, aluminum, aluminum alloy, stainless steel, etc., and the polymer material can be PDMS, silica gel, etc. In this embodiment, silica gel is selected. Silicone is soft and has very stable chemical properties, and is suitable for high temperature and high humidity application scenarios.

Preferably, the surface area of the condensation end 12 is the same as the surface area of the slot 6, so that the structure of the heat spreader can be more fully utilized and heat can be conducted.

The heat dissipation device of this embodiment embeds an ultra-thin heat spreader with high thermal conductivity between the windings, and adds an additional heat transfer path to guide the heat to the parallel I-type cooling water channels of the motor base. Since the I-type cooling water channels are connected by curved pipe parts, the flow direction of the water channel is changed compared with the first embodiment. The external cooling water enters the I-type cooling water channel through the left side of the same side of the motor base. The water channel takes away the heat from the heat sink and flows out from the right side of the same side of the motor base, and circulates continuously. The device of the second embodiment occupies less space than the matching water cooling device of the first embodiment, and is suitable for application scenarios that require space utilization.

Embodiment 3

As shown in Figures 11-16, a heat dissipation device based on a U-shaped linear motor embedded in a heat spreader is provided in this embodiment, including a heat spreader 1, two windings 2 and a motor base 3. The motor base 3 is provided with a U-shaped groove 4 and a cooling water channel 5 inside. The U-shaped groove 4 is provided with a slot 6 for inserting the heat spreader 1. The two windings 2 are respectively located on the left and right sides of the U-shaped groove 4. The shape and size of the bottom of the winding 2 match the shape and size of the U-shaped groove 4. The heat spreader 1 is located between the two windings 2, the bottom end of the heat spreader 1 is engaged with the slot 6, the upper end of the heat spreader 1 is an evaporation end 11 for absorbing heat, and the bottom end of the heat spreader 1 is a condensation end 12 for releasing heat. The evaporation end 11 and the winding 2 are closely attached. The cooling water channel 5 is U-shaped and located below the U-shaped groove 4. The cooling water channel 5 runs through the motor base 3. The cooling water channel 5 includes a water inlet section 51, a water outlet section 52 and a connecting section 53. The connecting section in the technical solution can be either straight or curved. The two ends of the connecting section 53 are respectively connected to the water inlet section 51 and the water outlet section 52, and the slot 6 is located between the water inlet section 51 and the water outlet section 52. In this embodiment, the heat spreader 1 is an ultra-thin heat spreader, and its connecting section is curved. Specific method: The slot 6 for embedding the heat spreader 1 and the U-shaped cooling water channel 5 are processed on the motor base by milling or deep hole drilling. The length of the motor base 3 is greater than the length of the winding 2, and the length of the water inlet section 51 and the water outlet section 52 of the internal cooling water channel is the same as the length of the winding 2, wherein the connecting section 53 is curved and is located inside the extension part of the motor base 3.

Preferably, more than two cooling water channels 5 are provided, and the cooling water channels 5 are arranged in a socketed manner, and the cooling water channels 5 are oriented in the same direction. In the present embodiment, the number of cooling water channels 5 is two. Furthermore, the water inlet section 51 is located on the left side of the slot 6, and the water outlet section 52 is located on the right side of the slot 6. The water inlet section and the water outlet section are respectively located on the left and right sides of the slot, which is conducive to more concentrated removal of heat and the setting of corresponding external water cooling pipes. In this structure, the two U-shaped cooling water channels can fully remove the heat brought by the heat spreader 1 from the winding.

Preferably, the cross section of the cooling water channel 5 is a square with a side length of 4 mm. The inventors have found that the water channel with a square cross section generates less water resistance, which is more conducive to improving the operating efficiency of the heat dissipation device.

Since aluminum alloy has good thermal conductivity and processing performance, preferably, the material of the motor base 3 is aluminum alloy.

The heat dissipation device of this embodiment embeds an ultra-thin heat spreader with high thermal conductivity between the windings, and adds an additional heat transfer path to guide it to the U-shaped cooling water channel set in the sleeve of the motor base. The structure of the U-shaped cooling water channel is concentrated around the condensation end to concentrate on taking away the heat conducted by the heat spreader. In addition, the contact area of heat transfer can be increased by designing multiple cooling water channels. When the heat dissipation device is working, the external cooling water enters the cooling water channel through the left side of the slot, takes away the heat of the heat spreader, and then flows out from the right side of the motor base, and circulates continuously, thereby achieving efficient longitudinal heat conduction and improving the performance of the motor. Based on the heat transfer mechanism of the heat spreader, it needs to have sufficient contact area with the water cooling module to exert its high thermal conductivity. The setting of the slot can not only fix the heat spreader, but also increase the contact area of the heat spreader and make it closer to the U-shaped cooling water channel.

Embodiment 4

As shown in Figures 17-19, the structure of this embodiment is basically the same as that of the third embodiment, except that: more than two cooling water channels 5 are provided, the connecting sections 53 are all linear, the connecting sections 53 are interconnected, the water inlet sections 51 are all located on the left side of the slot 6, and the water outlet sections 52 are all located on the right side of the slot 6. In this example, two cooling water channels 5 are provided. Specifically, the cross section of the cooling water channel 5 is circular.

The heat dissipation device of this embodiment has two cooling water channels connected to each other and in a straight line. Therefore, the cooling water from the outside enters the shared connection section through the two water inlet sections and then flows out from different water outlet sections respectively, and circulates continuously. Since the linear and shared connection section saves more space on the motor base than the curved sleeve connection section, the device of the fourth embodiment occupies less space than the heat dissipation device of the third embodiment, and is suitable for application scenarios that require space utilization.

Embodiment 5

The difference between this embodiment and the third embodiment is that a heat conducting layer is provided between the evaporation end 11 and the winding 2 and between the condensation end 12 and the slot 6. By filling the gaps between the components with the heat conducting layer, the heat exchange efficiency can be further improved.

Preferably, the material of the heat-conducting layer is heat-conducting glue or heat-conducting mud. In this embodiment, the material of the heat-conducting layer is heat-conducting glue.

The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

A heat dissipation device based on a U-shaped linear motor embedded in a heat spreader, characterized in that:

It comprises a heat spreader (1), two windings (2) and a motor base (3);

The motor base (3) is provided with a U-shaped groove (4) and a cooling water channel (5) inside, and the U-shaped groove (4) is provided with a slot (6) for inserting the heat spreader (1);

The two windings (2) are respectively located on the left and right sides of the U-shaped groove (4); the heat spreader (1) is located between the two windings (2); the bottom end of the heat spreader (1) is engaged with the slot (6); the top end of the heat spreader (1) is an evaporation end (11) for absorbing heat; the bottom end of the heat spreader (1) is a condensation end (12) for releasing heat; and the evaporation end (11) is attached to the windings (2);

The cooling water channel (5) is located below the U-shaped groove (4), and the cooling water channel (5) passes through the motor base (3).
The heat dissipation device of the U-shaped linear motor according to claim 1 is characterized in that:

The number of the cooling water channels (5) is more than two, and the cooling water channels (5) are I-shaped and arranged in parallel;

The slot (6) is located between adjacent cooling water channels (5).
The heat dissipation device of the U-shaped linear motor according to claim 2 is characterized in that:

It also includes a plurality of curved pipe members (7), wherein the curved pipe members (7) are located on the same side of the motor base (3);

The cooling water channel (5) comprises a left cooling water channel (51) and a right cooling water channel (52), wherein the left cooling water channel (51) is located on the left side of the slot (6), and the right cooling water channel (52) is located on the right side of the slot (6);

The number of the curved pipe member (7), the left cooling water channel (51) and the right cooling water channel (52) is the same, and the two ends of the curved pipe member (7) are respectively connected to the end of the left cooling water channel (51) and the end of the right cooling water channel (52).
The heat dissipation device of the U-shaped linear motor according to claim 1 is characterized in that:

The cooling water channel (5) is U-shaped, and comprises a water inlet section (510), a water outlet section (520) and a connecting section (530); two ends of the connecting section (530) are respectively connected to the water inlet section (510) and the water outlet section (520); and the slot (6) is located between the water inlet section (510) and the water outlet section (520).
The heat dissipation device of the U-shaped linear motor according to claim 4 is characterized in that:

More than two cooling water channels (5) are provided, and the cooling water channels (5) are arranged in a sleeve-connected manner;

The water inlet sections (510) are all located on the left side of the slot (6), and the water outlet sections (520) are all located on the right side of the slot (6).
The heat dissipation device of the U-shaped linear motor according to claim 4 is characterized in that:

The cooling water channels (5) are provided with more than two, the connecting sections (530) are all in a straight line shape, and the connecting sections (530) are interconnected;

The water inlet sections (510) are all located on the left side of the slot (6), and the water outlet sections (520) are all located on the right side of the slot (6).
The heat dissipation device of the U-shaped linear motor according to claim 1 is characterized in that:

The cross section of the cooling water channel (5) is square.
The heat dissipation device of the U-shaped linear motor according to claim 1 is characterized in that:

A heat-conducting layer is provided between the evaporation end (11) and the winding (2), and between the condensation end (12) and the slot (6).
The heat dissipation device of the U-shaped linear motor according to claim 8 is characterized in that:

The material of the heat-conducting layer is heat-conducting glue or heat-conducting mud.
The heat dissipation device of the U-shaped linear motor according to claim 1 is characterized in that:

The heat spreader (1) is a copper-based heat spreader or an aluminum-based heat spreader.