Mining frequency conversion all-in-one machine water cooling plate and machining method thereof

Abstract

The invention discloses a mining frequency conversion all-in-one machine water cooling plate and a machining method thereof, and belongs to the field of mining machinery. A mining frequency conversion all-in-one machine water cooling plate comprises a stainless steel layer, a heat dissipation layer and a brazing material layer, and the heat dissipation layer is made of metal with the heat conductivity coefficient higher than that of the stainless steel layer; a continuous cooling water channel is arranged on the heat dissipation layer; the periphery of the stainless steel layer is bent to form a circle of surrounding edge; structured hollowed-out patterns matched with the cooling water channels are formed in the positions, corresponding to the cooling water channels, of the brazing material layer. The stainless steel layer covers the heat dissipation layer, and the brazing material layer is arranged between the stainless steel layer and the heat dissipation layer and is sealed through vacuum brazing, so that the cooling water channel is sealed inside; the surrounding edge completely wraps the periphery of the heat dissipation layer. The processing method is used for processing the water cooling plate of the mining frequency conversion all-in-one machine. The two materials are compounded through vacuum brazing, the heat dissipation performance can be effectively improved, and the requirement that the mining frequency conversion all-in-one machine develops towards the high power density direction is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mining machinery, in particular to a water cooling plate for a mining frequency conversion all-in-one machine and a processing method thereof. BACKGROUND

[0002] In recent years, mining frequency conversion all-in-one machines have been widely used in mining faces due to their advantages such as high efficiency, energy saving, compact size, precise control (such as stepless speed regulation, dynamic response, and load adaptive adjustment), etc. Their technical characteristics significantly improve the equipment operation efficiency, reduce mechanical wear and tear, and prolong the service life, becoming one of the key equipment for intelligent mining in coal mines.

[0003] However, with the continuous increase in power density, the contradiction between heat dissipation capacity and power demand is increasingly prominent. According to the provisions of Appendix 1 of GB 3836.2-2021 "Explosive Atmospheres Part 2: Equipment Protected by Flameproof Enclosure 'd'", the enclosure of electrical equipment in mining faces must be made of steel plate or cast steel material. This requirement is due to the particularity of the coal mine environment: the equipment enclosure frequently contacts with coal, and light metals such as aluminum are prone to produce electric sparks in friction or collision, which poses a major safety hazard of igniting gas or coal dust.

[0004] Currently, the heat dissipation design of mining frequency conversion all-in-one machines generally relies on steel water cooling plates, but the low thermal conductivity of steel (about 50 W / (m·K)) seriously restricts the heat dissipation efficiency under high power density. This material limitation leads to a thermal management bottleneck when the equipment is upgraded in power, and it is urgent to break through the boundary of heat dissipation performance through innovative solutions such as structural optimization, while meeting the requirements of explosion-proof safety. SUMMARY

[0005] The present application aims to solve the above problems and provides a water cooling plate for a mining frequency conversion all-in-one machine and a processing method thereof.

[0006] The purpose of the present application is achieved as follows:

[0007] A water cooling plate for a mining frequency conversion all-in-one machine, comprising a stainless steel layer, a heat dissipation layer, and a brazing material layer, wherein the heat dissipation layer is made of a metal with a higher thermal conductivity than that of the stainless steel layer;

[0008] A continuous cooling water channel is provided on the heat dissipation layer;

[0009] The stainless steel layer is bent around the perimeter to form a surrounding edge;

[0010] The brazing material layer corresponds to the position of the cooling water channel and forms a structured hollow pattern matching the cooling water channel;

[0011] The stainless steel layer covers the heat dissipation layer, and the brazing material layer is placed between the stainless steel layer and the heat dissipation layer. The layer is sealed by vacuum brazing, so that the cooling water channel is sealed inside; the edging completely covers the perimeter of the heat dissipation layer.

[0012] The stainless steel layer is provided with an inlet and an outlet at each end of the cooling water channel.

[0013] After the stainless steel layer is covered on the heat dissipation layer, the water inlet and the water outlet are respectively connected to the two ends of the cooling water channel.

[0014] The cooling water channel has undergone nickel plating.

[0015] The water-cooled plate is provided with countersunk holes and internal threaded holes;

[0016] The countersunk hole is used to connect the water-cooled plate and the frequency converter, and the frequency converter is configured to be close to and fully cover the heat dissipation layer.

[0017] A wire threaded sleeve is provided in the internal threaded hole to connect the water-cooled plate and the motor. The motor is positioned to be close to the stainless steel layer, with part of the stainless steel layer exposed.

[0018] The heat dissipation layer is made of aluminum.

[0019] This invention also proposes a method for processing a water-cooled plate for a mining variable frequency integrated machine, used to process any of the aforementioned water-cooled plates for mining variable frequency integrated machines. The method includes the following steps:

[0020] A continuous cooling water channel is formed on the heat dissipation layer by casting, machining or extrusion molding;

[0021] A rim is formed by bending the stainless steel layer around its perimeter through casting, machining, or extrusion molding.

[0022] Process the brazing material layer, and hollow out the brazing material layer corresponding to the position of the cooling water channel to form a structured hollow pattern that matches the cooling water channel;

[0023] The heat dissipation layer, the brazing material layer, and the stainless steel layer are stacked sequentially.

[0024] The brazing material layer is melted by vacuum brazing, so that the heat dissipation layer and the stainless steel layer are metallurgically bonded to form a water-cooled plate, which seals the cooling water channel inside.

[0025] The method further includes: nickel plating the cooling water channel.

[0026] The heat dissipation layer is made of aluminum; the brazing material layer is made of aluminum-based brazing material.

[0027] The method further includes: machining countersunk holes and internal threaded holes on the water-cooled plate, and installing wire threaded inserts in the internal threaded holes.

[0028] The method further includes removing the brazing filler metal that overflows after vacuum brazing.

[0029] The beneficial effects of this invention are as follows: the heat dissipation layer is made of a metal material with a higher thermal conductivity, preferably aluminum, which is lightweight and low in cost; the stainless steel layer is made of an auxiliary material with good corrosion resistance; the two materials are combined by vacuum brazing, which can not only meet the mechanical strength and safety requirements, but also effectively improve its heat dissipation performance, which meets the needs of mining frequency converters to develop towards high power density. Attached Figure Description

[0030] Figure 1 A side view of the water-cooled plate of the integrated frequency converter for mining according to the present invention is shown.

[0031] Figure 2 It shows Figure 1 Front view of the stainless steel layer;

[0032] Figure 3 It shows Figure 2 Front view of the heat dissipation layer;

[0033] Figure 4 The diagram shows the usage status of the water-cooled plate of the integrated frequency converter for mining according to the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1-Inverter;

[0036] 2-Water-cooled plate;

[0037] 21-Stainless steel layer, 22-Brazing material layer, 23-Heat dissipation layer, 24-Water inlet, 25-Water outlet, 26-Wire thread sleeve, 27-Cooling water channel;

[0038] 3-Motor and gearbox. Detailed Implementation

[0039] Various embodiments of the present invention will be described with reference to the accompanying drawings. In the specification and drawings, elements with similar structures or functions will be represented by the same element symbols. It is understood that the drawings are for reference and illustration only and are not intended to limit the invention. The dimensions shown in the drawings are merely for clarity of description and do not limit the scale relationships or provide an exhaustive description of the invention, nor are they intended to limit the scope of the invention.

[0040] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] This invention proposes a water-cooled plate for a mining frequency converter integrated machine.

[0042] In Example 1, as Figures 1-3 As shown, a water-cooled plate for a mining variable frequency drive includes a stainless steel layer 21, a heat dissipation layer 23, and a brazing material layer 22. The heat dissipation layer 23 is made of a metal with a higher thermal conductivity than that of the stainless steel layer 21. Specifically, the stainless steel layer 21 can be made of 304 stainless steel. The heat dissipation layer 23 is preferably made of aluminum, such as aerospace-grade 7075 aluminum, whose mechanical strength is equivalent to Q235 steel (a type of carbon structural steel). Using aluminum for the heat dissipation layer 23 results in a thermal conductivity more than five times that of steel, significantly improving the heat dissipation performance of the water-cooled plate 2. Simultaneously, its mechanical strength is similar to that of 304 stainless steel, allowing the water-cooled plate 2 to meet both heat dissipation and mechanical strength requirements.

[0043] The heat dissipation layer 23 has continuous cooling channels 27. The stainless steel layer 21 is bent around its perimeter to form a rim. The brazing material layer 22 corresponds to the position of the cooling channels 27, forming a structured hollow pattern that matches the cooling channels 27 to prevent the brazing material from clogging the cooling channels 27. When the heat dissipation layer 23 is made of aluminum (7075 aluminum) and the stainless steel layer 21 is made of 304 stainless steel, the brazing material layer 22 uses an aluminum-based brazing material with a melting point lower than that of aerospace-grade aluminum 7075 and 304 stainless steel.

[0044] A stainless steel layer 21 covers the heat dissipation layer 23, and a brazing material layer 22 is placed between the stainless steel layer 21 and the heat dissipation layer 23. Vacuum brazing is used to seal the cooling channels 27 internally. An edge completely covers the perimeter of the heat dissipation layer 23. By using vacuum brazing between the stainless steel layer 21 and the heat dissipation layer 23 (preferably made of aluminum), the aluminum material is completely isolated while ensuring the airtightness of the cooling channels 27 in the water-cooled plate 2. The edge of the stainless steel layer 21 completely covers the perimeter of the heat dissipation layer 23, so that only one surface of the water-cooled plate 2 is made of aluminum, while the other surface and the perimeter are made of stainless steel.

[0045] Therefore, the water cooling plate of the mining frequency conversion integrated machine in the embodiment is actually a composite material of aluminum and stainless steel, wherein the aluminum is used as the main material, has a higher heat conductivity coefficient, and is light in weight and low in cost; the stainless steel is used as the auxiliary material, has good corrosion resistance, and the two materials are combined through vacuum brazing, so that the mechanical strength requirement and the safety requirement can be met, and the heat dissipation performance can be effectively improved, thereby meeting the requirement of the mining frequency conversion integrated machine to develop in the direction of high power density.

[0046] Further, to prevent galvanic corrosion between the aluminum and the stainless steel, the cooling water channel 27 is subjected to nickel plating treatment after brazing is completed.

[0047] The actual use state of the water cooling plate of the mining frequency conversion integrated machine in the embodiment is shown in Fig. 2. Figure 4 As shown in Fig. 2, the water cooling plate 2 is located between the frequency converter 1 and the motor and the reduction gearbox 3. Specifically, the frequency converter 1 is a mining explosion-proof frequency converter 1, and the motor is a mining explosion-proof motor. To realize the connection between the water cooling plate 2 and the frequency converter 1 and the motor, the water cooling plate 2 is provided with a countersunk hole and an internal threaded hole. The countersunk hole is used to realize the connection between the water cooling plate 2 and the frequency converter 1, and the frequency converter 1 is arranged to tightly cover the heat dissipation layer 23, that is, the aluminum surface of the water cooling plate 2 is completely sealed in the shell of the frequency converter 1 and will not be exposed. The internal threaded hole is provided with a steel wire sleeve 26, which is used to realize the connection between the water cooling plate 2 and the motor, and the motor is arranged to tightly contact the stainless steel layer 21, and part of the stainless steel layer 21 is exposed, which means that only the stainless steel layer 21 of the entire water cooling plate 2 will be exposed outside the explosion-proof shell of the mining frequency conversion integrated machine, thereby meeting the explosion-proof safety requirement of the mining machinery. The material of the steel wire sleeve 26 is selected to be Q550 steel, which has a higher strength than the aluminum material 7075, so as to increase the connection strength between the water cooling plate 2 and the motor.

[0048] To realize the external circulation of the cooling liquid in the cooling water channel 27, the cooling water channel 27 needs to be communicated with the external cooling equipment, and only part of the stainless steel layer 21 of the water cooling plate 2 will be exposed in the actual use state. Therefore, the water inlet 24 and the water outlet 25 are arranged at the two ends of the stainless steel layer 21 corresponding to the cooling water channel 27. After the stainless steel layer 21 is covered on the heat dissipation layer 23, the water inlet 24 and the water outlet 25 are respectively communicated with the two ends of the cooling water channel 27, and when the water inlet 24 and the water outlet 25 are installed, it is confirmed that the part of the stainless steel layer 21 where the water inlet 24 and the water outlet 25 are located is the exposed part.

[0049] The present application also provides a processing method of the water cooling plate of the mining frequency conversion integrated machine, which is used to process the water cooling plate of the mining frequency conversion integrated machine in the embodiment, and includes the following steps.

[0050] In step one, the heat dissipation layer is processed to form a continuous cooling water channel on the heat dissipation layer through casting, machining or extrusion forming. The heat dissipation layer is preferably made of aluminum material, for example, aviation aluminum material 7075.

[0051] Step two, process the stainless steel layer, preferably 304 steel, and bend the four sides of the stainless steel layer to form a surrounding edge by casting or machining or extrusion forming. The size of the stainless steel layer with the surrounding edge is large enough to cover one side and the surrounding of the heat dissipation layer.

[0052] Step three, process the brazing material layer, and hollow out the brazing material layer corresponding to the position of the cooling water channel to form a structured hollow pattern matching the cooling water channel to avoid the brazing material blocking the cooling water channel during vacuum brazing. The size of the brazing material layer is slightly larger than that of the heat dissipation layer. In addition, the heat dissipation layer is made of aluminum material, and the brazing material layer is made of aluminum-based brazing material, which has a lower melting point than aviation aluminum 7075 and 304 stainless steel.

[0053] Step four, stack the processed heat dissipation layer, brazing material layer and stainless steel layer in order.

[0054] Step five, melt the brazing material layer by vacuum brazing to metallurgically combine the heat dissipation layer and the stainless steel layer to form a water-cooled plate, and seal the cooling water channel inside.

[0055] Step six, nickel plating treatment is performed on the cooling water channel sealed in the water-cooled plate to prevent galvanic corrosion between aluminum and stainless steel.

[0056] Step seven, remove the excess brazing material after vacuum brazing. Since the size of the brazing material layer is slightly larger than that of the heat dissipation layer, it is large enough to fill the space between the heat dissipation layer and the stainless steel layer (avoiding the position of the cooling water channel), so a little bit of brazing material will overflow after the vacuum brazing is completed. To avoid affecting the performance or causing safety hazards, the part of the overflowed brazing material needs to be removed.

[0057] Step eight, process a countersunk hole and an internal threaded hole on the water-cooled plate, and set a steel wire sleeve in the internal threaded hole. The processed countersunk hole and internal threaded hole are used to install the water-cooled plate into the mine frequency conversion integrated machine, wherein the countersunk hole is used to realize the connection of the water-cooled plate and the frequency converter, and the internal threaded hole is used to realize the connection of the water-cooled plate and the motor. In order to increase the connection strength between the water-cooled plate and the motor, a steel wire sleeve is set in the internal threaded hole, and the material of the steel wire sleeve is preferably Q550 steel, which has a higher strength than aluminum 7075.

[0058] The water-cooled plate processed by the method is actually a composite material, which is preferably composed of aluminum material and stainless steel. Among them, the aluminum material is used as the main material, has a higher thermal conductivity, and is light in weight and low in cost; the stainless steel is used as the auxiliary material, and has good corrosion resistance. The main material aluminum and the auxiliary material stainless steel are combined into a composite material by vacuum brazing, the sealing of the cooling water channel is realized by vacuum brazing, and the sealing is good. The water-cooled plate processed by the method, the main material aluminum can effectively improve the overall heat dissipation of the water-cooled plate, and the mechanical strength is also enough to meet the demand of the water-cooled plate, the auxiliary material stainless steel fully covers the aluminum material that may be exposed, so that the water-cooled plate can meet the safety requirement of mining machinery, and meet the demand of the development of mining frequency conversion all-in-one machine to high power density.

[0059] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A water-cooled plate for a mining frequency converter integrated machine, characterized in that, It includes a stainless steel layer, a heat dissipation layer, and a brazing material layer, wherein the heat dissipation layer is made of a metal with a higher thermal conductivity than that of the stainless steel layer; The heat dissipation layer is provided with continuous cooling water channels; The stainless steel layer is bent around its perimeter to form a rim. The brazing material layer corresponds to the position of the cooling water channel, forming a structured hollow pattern that matches the cooling water channel; The stainless steel layer covers the heat dissipation layer, and the brazing material layer is placed between the stainless steel layer and the heat dissipation layer. The layer is sealed by vacuum brazing, so that the cooling water channel is sealed inside. The edging completely covers the perimeter of the heat dissipation layer.

2. The water-cooled plate for a mining frequency converter as described in claim 1, characterized in that, The stainless steel layer is provided with an inlet and an outlet at each end of the cooling water channel; After the stainless steel layer is covered on the heat dissipation layer, the water inlet and the water outlet are respectively connected to the two ends of the cooling water channel.

3. The water-cooled plate for a mining frequency converter as described in claim 1, characterized in that, The cooling water channels have been nickel-plated.

4. The water-cooled plate for a mining frequency converter as described in claim 1, characterized in that, The water-cooled plate is provided with countersunk holes and internal threaded holes; The countersunk hole is used to connect the water-cooled plate and the frequency converter, and the frequency converter is configured to be close to and fully cover the heat dissipation layer. A wire threaded sleeve is provided in the internal threaded hole to connect the water-cooled plate and the motor. The motor is positioned to be close to the stainless steel layer, with part of the stainless steel layer exposed.

5. The water-cooled plate for a mining frequency converter integrated machine according to any one of claims 1-4, characterized in that, The heat dissipation layer is made of aluminum.

6. A method for processing a water-cooled plate for a mining frequency converter integrated machine, characterized in that, The method for processing a water-cooled plate for a mining frequency converter as described in any of claims 1 to 5 includes the following steps: A continuous cooling water channel is formed on the heat dissipation layer by casting, machining or extrusion molding; A rim is formed by bending the stainless steel layer around its perimeter through casting, machining, or extrusion molding. Process the brazing material layer, and hollow out the brazing material layer corresponding to the position of the cooling water channel to form a structured hollow pattern that matches the cooling water channel; The heat dissipation layer, the brazing material layer, and the stainless steel layer are stacked sequentially. The brazing material layer is melted by vacuum brazing, so that the heat dissipation layer and the stainless steel layer are metallurgically bonded to form a water-cooled plate, which seals the cooling water channel inside.

7. The processing method of the water-cooled plate for the integrated frequency converter in mining according to claim 6, characterized in that, The method further includes: nickel plating the cooling water channel.

8. The processing method of the water-cooled plate for the integrated frequency converter in mining according to claim 6, characterized in that, The heat dissipation layer is made of aluminum; the brazing material layer is made of aluminum-based brazing material.

9. The processing method of the water-cooled plate for the integrated frequency converter in mining according to claim 6, characterized in that, The method further includes: machining countersunk holes and internal threaded holes on the water-cooled plate, and installing wire threaded inserts in the internal threaded holes.

10. The processing method of the water-cooled plate for the integrated frequency converter in mining according to claim 6, characterized in that, The method further includes removing the brazing filler metal that overflows after vacuum brazing.

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