Cryogenic electron screen separator using microchannel cold plate

Abstract

The present invention discloses a low-temperature electronic screen separator using a microchannel cold plate. At present, the screen remover melts the sealing glue manually or by heating to complete the removal of the liquid crystal screen. The present invention includes a separator shell, and a self-cascade refrigeration device is arranged in the shell. The self-cascade refrigeration device includes a compressor, a condenser, a gas-liquid separator, an energy recovery device, and a microchannel evaporator. The evaporator main pipe and the microchannel tube of the microchannel evaporator are metal tubes, the outer diameter D of the microchannel tube is ≤2mm, and the distance between two adjacent microchannel tubes is 1 to 2mm. The self-cascade refrigeration device of the present invention can quickly form a low temperature of ‑135°C on the cooling surface, rapidly cool the liquid crystal screen of electronic devices such as mobile phones, and the frame sticks to lose its function at this temperature, so the screen removal can be completed more conveniently. The present invention has a short cooling time, a small volume, a light weight, and a small amount of refrigerant filling.

Description

Technical Field

[0001] The invention belongs to the field of refrigeration technology, and in particular relates to a low-temperature electronic screen separator using a microchannel cold plate. Background Art

[0002] The LCD screens of electronic devices (such as mobile phones, tablet computers, and liquid crystal displays) all have the frame of the color filter substrate pasted on the thin film transistor substrate. If the screen body is damaged, the screen body needs to be removed from the circuit board. In the prior art, the screen is mostly removed by heating. Currently, the main method is manual. When disassembling, first use a fire source to soften the frame glue at one corner of the LCD screen, then use a blade or other tool to insert it between the color filter substrate and the thin film transistor substrate, and pry the color filter substrate and the thin film transistor substrate apart after cutting for a circle. There are also screen dismantling machines, such as the invention patent with patent number 200810056494.X, which discloses a liquid crystal display screen dismantling machine, which melts the frame glue by heating the resistance wire, and completely cuts off the frame glue connecting the color filter substrate and the TFT substrate by rotating, completing the screen dismantling; the invention patent application with application number 201711048943.1 discloses a mobile phone screen dismantling machine, which heats and separates the mobile phone screen by using an electric melting plate, and removes the mobile phone screen by the glass panel on the cover; the utility model patent with patent number 201520354182.2 discloses a mobile terminal screen dismantling heater, which is provided with a rectangular heating area adapted to the size of the mobile terminal display screen, and also melts the frame glue by heating to complete the screen dismantling. It can be seen that the screen dismantling machine also mainly uses heating to melt the frame glue to complete the dismantling. Summary of the invention

[0003] The purpose of the present invention is to provide a low-temperature electronic screen separator using a microchannel cold plate in view of the deficiencies of the prior art.

[0004] The invention comprises a separator shell, an upper cover is arranged on the shell, and a self-cascade refrigeration device is arranged in the shell.

[0005] The self-cascade refrigeration device comprises a compressor, a condenser, a gas-liquid separator, an energy recovery device and a microchannel evaporator.

[0006] The gas-liquid separator is provided with a liquid working medium outlet at the bottom and a gaseous working medium outlet at the top.

[0007] The energy recovery device comprises an inner tube and a jacket, wherein the jacket is wrapped around the inner tube; the two ends of the inner tube are respectively a front gaseous medium inlet and a supercooled liquid outlet, and the inlet and outlet extend out of the jacket; the jacket is provided with a gas-liquid mixed medium inlet, a rear gaseous medium inlet, and a gaseous mixed medium outlet.

[0008] The microchannel evaporator includes an evaporator main pipe and a microchannel tube; the evaporator main pipes are two parallel pipes, one end of the two evaporator main pipes is closed, and the other ends are the evaporator inlet and the evaporator outlet respectively; the two ends of the multiple parallel microchannel tubes are connected and communicated with the two evaporator main pipes respectively to form a parallel structure. The evaporator main pipe and the microchannel tube are metal tubes; wherein the outer diameter D of the microchannel tube is ≤2mm, and the distance between two adjacent microchannel tubes is 1-2mm.

[0009] The outlet of the compressor is connected to the inlet of the condenser through an exhaust pipe, and the outlet of the condenser is connected to the gas-liquid separator through a drying filter; the liquid working medium outlet of the gas-liquid separator is connected to the gas-liquid mixed working medium inlet of the energy recovery device jacket through a first capillary tube; the gaseous working medium outlet of the gas-liquid separator is connected to the front gaseous working medium inlet of the inner tube of the energy recovery device, the supercooled liquid outlet of the inner tube of the energy recovery device is connected to the inlet of the microchannel evaporator through a second capillary tube, the outlet of the microchannel evaporator is connected to the rear gaseous working medium inlet of the energy recovery device jacket, and the gaseous mixed working medium outlet of the energy recovery device jacket is connected to the inlet of the compressor through an air inlet pipe.

[0010] Furthermore, the microchannel evaporator also includes a cold plate.

[0011] The microchannel evaporator can adopt the following structure:

[0012] A plurality of semicircular through grooves are parallelly opened on the upper surface of the cold plate, and the microchannel tubes are arranged on the through grooves; the plurality of microchannel tubes are arranged in parallel on a plane, and the upper parts of the plurality of microchannel tubes constitute a cooling surface;

[0013] Alternatively, the microchannel tube is directly welded to the flat surface of the cold plate; multiple microchannel tubes are arranged in parallel on a plane, and the upper parts of the multiple microchannel tubes constitute the cooling surface;

[0014] Alternatively, a plurality of circular through holes are opened in parallel through the cold plate; the microchannel tubes are arranged through the through holes, and the surface of the cold plate serves as a cooling surface;

[0015] Alternatively, the cold plate is made of a metal plate, and a plurality of circular through holes are opened in parallel through two opposite sides of the cold plate, and the inner diameter of the through holes is D≤2mm, forming a microchannel tube; two evaporator main pipes are fixedly arranged on both sides of the cold plate and connected through the microchannel tube, and the surface of the cold plate is used as the cooling surface.

[0016] The low-temperature electronic screen separator of the present invention adopts a self-cascade refrigeration device, which can quickly form a low temperature of -135°C on the cooling surface, rapidly cool the liquid crystal screen of electronic devices such as mobile phones, and the frame becomes useless at this temperature, so the screen can be disassembled more conveniently. The present invention has the advantages of short cooling time, small size, light weight, and small amount of refrigerant filling, and provides a new screen disassembly machine solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall schematic diagram of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the structure of the medium auto-cascade refrigeration device;

[0019] Figure 3 It is a structural schematic diagram of an implementation mode of a microchannel evaporator in the present invention;

[0020] Figure 4 yes Figure 3 A cross-sectional view of

[0021] Figure 5 It is a structural schematic diagram of another embodiment of the microchannel evaporator of the present invention;

[0022] Figure 6 yes Figure 5 sectional view of . DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and the examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] like Figure 1 As shown, a low-temperature electronic screen separator using a microchannel cold plate comprises a separator housing 1, a flip cover 2 is arranged on the housing 1, and a self-cascade refrigeration device is arranged inside the housing 1.

[0025] like Figure 2 As shown, the self-cascade refrigeration device includes a compressor 3, a condenser 4, a gas-liquid separator 5, an energy recovery device 6, a microchannel evaporator 7

[0026] The gas-liquid separator 5 is provided with a liquid medium outlet 501 at the bottom and a gaseous medium outlet 502 at the top.

[0027] The energy recovery device 6 includes an inner tube 601 and a jacket 602, wherein the jacket 602 is wrapped around the inner tube 601; the two ends of the inner tube 601 are respectively a front gaseous working medium inlet 611 and a supercooled liquid outlet 612, which extend out of the jacket 602; the jacket 602 is provided with a gas-liquid mixed working medium inlet 621, a rear gaseous working medium inlet 622, and a gaseous mixed working medium outlet 623.

[0028] The microchannel evaporator 7 includes an evaporator main pipe 701 and a microchannel tube 702. The evaporator main pipe 701 is two parallel pipes, one end of the two evaporator main pipes 701 is closed, and the other end is an evaporator inlet 711 and an evaporator outlet 712. The two ends of the multiple parallel microchannel tubes 702 are connected and communicated with the two evaporator main pipes 701 to form a parallel structure. The evaporator main pipe 701 and the microchannel tube 702 are made of copper or stainless steel metal tubes, which are adjusted according to different usage conditions to expand the scope of use and enhance the flexibility of assembly. Among them, the microchannel tube 702 is a metal round tube with an outer diameter D≤2mm, and the distance between two adjacent microchannel tubes 702 is 1-2mm. The microchannel tube 702 uses a metal tube bundle with a small heat capacity, which can achieve rapid cooling.

[0029] The outlet of the compressor 3 is connected to the inlet of the condenser 4 through the exhaust pipe 8, and the outlet of the condenser 4 is connected to the gas-liquid separator 5 through the drying filter 9. The liquid working medium outlet 501 below the gas-liquid separator 5 is connected to the gas-liquid mixed working medium inlet 621 of the energy recovery device jacket 602 through the first capillary 10. The gaseous working medium outlet 502 above the gas-liquid separator 5 is connected to the front gaseous working medium inlet 611 of the energy recovery device inner tube 601 through a pipeline, and the supercooled liquid outlet 612 of the energy recovery device inner tube 601 is connected to the microchannel evaporator inlet 711 through the second capillary 11, and the microchannel evaporator outlet 712 is connected to the rear gaseous working medium inlet 622 of the energy recovery device jacket 602. The gaseous mixed working medium outlet 623 of the energy recovery device jacket 602 is connected to the inlet of the compressor 3 through the air inlet pipe 12.

[0030] The mixed working fluid composed of several working fluids with different boiling points is compressed into a high-temperature and high-pressure mixed gas by the compressor 3, and enters the condenser 4 through the exhaust pipe 8. After the mixed working fluid passes through the condenser 4, the high-temperature and high-pressure mixed gas is condensed into a high-temperature and high-pressure gas-liquid mixture, and enters the gas-liquid separator 5 after preliminary filtration of impurities by the drying filter 9.

[0031] After passing through the condenser 4, the Class A component with a high boiling point in the mixed working fluid is condensed into liquid, discharged through the liquid working fluid outlet 501 below the gas-liquid separator 5, and after being converted into a gas-liquid mixed state through the first capillary 10, it enters the jacket 602 of the energy recovery device through the gas-liquid mixed working fluid inlet 621.

[0032] After passing through the condenser 4, the Class B component with a low boiling point in the mixed working fluid is still in a gaseous state, and is discharged through the gaseous working fluid outlet 502 above the gas-liquid separator 5, and enters the inner tube 601 of the energy recovery device 6 through the front gaseous working fluid inlet 611 through the pipeline, and is condensed into a supercooled liquid through the inner tube 601, and is discharged from the supercooled liquid outlet 612. The supercooled liquid is converted into a gas-liquid mixed state through the second capillary 11, and enters the microchannel evaporator 7 from the evaporator inlet 711 to evaporate and absorb heat, cooling the microchannel tube 702, and the microchannel tube 702 cools the electronic liquid crystal screen.

[0033] After passing through the microchannel evaporator 7 , the type B component in the mixed working fluid becomes gaseous, is discharged from the evaporator outlet 712 , and enters the jacket 602 of the energy recovery device through the post-positioned gaseous working fluid inlet 622 .

[0034] The gas-liquid mixed state of Class A components and the gaseous Class B components are mixed in the jacket 602 of the energy recovery device, and heat exchange is performed with the gaseous Class B components in the inner tube 601. According to the principle of self-cascading, the mixed working medium in the jacket 602 of the energy recovery device is converted into a gaseous state, discharged from the gaseous mixed working medium outlet 623, and returned to the compressor 3 through the pipeline.

[0035] like Figure 3 and 4 , a structure of a microchannel evaporator, including an evaporator main pipe 701, a microchannel tube 702, and a cold plate 703.

[0036] The evaporator main pipes 701 are two parallel pipes, one end of the two evaporator main pipes 701 is closed, and the other ends are respectively the evaporator inlet 711 and the evaporator outlet 712. The multiple microchannel pipes 702 are arranged in parallel on a plane, and the two ends of the microchannel pipes 702 are respectively connected and communicated with the two evaporator main pipes 701 to form a parallel structure.

[0037] The cold plate 703 is a flat plate with a plurality of semicircular through grooves opened in parallel on the upper surface. The microchannel tubes 702 are arranged on the through grooves, and the upper parts of the plurality of microchannel tubes 702 constitute a cooling surface.

[0038] As another method, the microchannel tube 702 can also be directly welded to the flat surface of the cold plate 703 .

[0039] The cooling surface of this structure is directly composed of the outer wall of the metal circular tube. The LCD screen that needs to be removed is directly placed on the microchannel tube. There is no need for a cold plate to transfer heat. The cold in the refrigerant is directly transferred to the electronic screen through the metal tube, which can achieve rapid cooling and greatly improve the cooling effect.

[0040] like Figure 5 and 6 Another microchannel evaporator structure includes an evaporator main pipe 701, a microchannel tube 702, and a cold plate 703.

[0041] There are two evaporator main pipes 701 arranged in parallel, one end of the two evaporator main pipes 701 is closed, and the other ends are respectively an evaporator inlet 711 and an evaporator outlet 712. A plurality of microchannel tubes 702 are arranged in parallel, and both ends of the microchannel tubes 702 are connected and communicated with the two evaporator main pipes 701, forming a parallel structure.

[0042] The cold plate 703 is a flat plate with a plurality of circular through holes extending through the flat plate in parallel, and the microchannel tube 702 is arranged through the through holes, and the upper surface of the cold plate 703 serves as a cooling surface. The microchannel tube 702 is embedded in the cold plate 703, thereby improving the heat exchange efficiency between the cold plate and the microchannel tube and reducing the cooling time.

[0043] As another method, the cold plate 703 is a metal flat plate, and a plurality of circular through holes are opened in parallel through two opposite sides of the cold plate 703, and the inner diameter of the through holes D is less than 2 mm, forming a microchannel tube 702. Two evaporator main pipes 701 are fixedly arranged on both sides of the cold plate 703 and connected through the microchannel tube 702; the surface of the cold plate 703 is used as a cooling surface.

[0044] The low-temperature electronic screen separator can quickly form a low temperature of -135℃ on the cooling surface of the microchannel evaporator, rapidly cool the LCD screen of mobile phones and other electronic devices, and the frame will lose its function at this temperature, so the screen can be removed more conveniently. The traditional method of welding a 9.52mm thick copper tube under the cold plate is that the cold energy in the refrigerant is transferred through the thick copper tube wall and the cold plate, the heat transfer efficiency is very low, and the cooling speed is too slow; and the material of the thick copper tube is large, there is a large heat sink, and the cooling time is long, which is not conducive to rapid cooling; the thick copper tube has a large diameter and is not suitable for cooling the screen removal machine.

[0045] The low temperature electronic screen separator of the present invention has the advantages of short cooling time, small volume, light weight, small amount of refrigerant charge, etc. It can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purpose of the present invention, which are all within the scope of protection of this patent.

Claims

1. A cryogenic electronic screen separator using a microchannel cold plate, comprising a housing (1), a flap (2) being arranged on the housing (1), characterized in that: The shell (1) is provided with an auto-cascade refrigeration device; the auto-cascade refrigeration device comprises a compressor (3), a condenser (4), a gas-liquid separator (5), an energy recovery device (6), and a microchannel evaporator (7); a liquid working medium outlet (501) is provided at the bottom of the gas-liquid separator (5), and a gas working medium outlet (502) is provided at the top; the energy recovery device (6) comprises an inner tube (601) and a jacket (602), and the jacket (602) is wrapped around the inner tube (601); the two ends of the inner tube (601) are respectively a front gas working medium inlet (611) and a supercooled liquid outlet (612). , extending out of the jacket (602); the jacket (602) is provided with a gas-liquid mixed medium inlet (621), a post-placed gaseous medium inlet (622), and a gaseous mixed medium outlet (623); the microchannel evaporator (7) comprises an evaporator main pipe (701) and a microchannel tube (702); the evaporator main pipe (701) is two parallel-arranged ones, one end of the two evaporator main pipes (701) is closed, and the other end is respectively an evaporator inlet (711) and an evaporator outlet (712); the two ends of the plurality of parallel-arranged microchannel tubes (702) are respectively connected to and communicated with the two evaporator main pipes (701), forming The invention relates to a parallel structure; the evaporator main pipe (701) and the microchannel pipe (702) are made of copper or stainless steel; the evaporator main pipe (701) and the microchannel pipe (702) are metal pipes; wherein the outer diameter D of the microchannel pipe (702) is less than or equal to 2 mm, and the distance between two adjacent microchannel pipes (702) is 1 to 2 mm; the outlet of the compressor (3) is connected to the inlet of the condenser (4) through the exhaust pipe (8), and the outlet of the condenser (4) is connected to the gas-liquid separator (5) through the drying filter (9); the liquid working medium outlet (501) of the gas-liquid separator is connected to the energy recovery device (501) through the first capillary tube (10); The gas-liquid mixed working medium inlet (621) of the energy recovery device jacket (602); the gaseous working medium outlet (502) of the gas-liquid separator is connected to the front gaseous working medium inlet (611) of the energy recovery device inner tube (601); the supercooled liquid outlet (612) of the energy recovery device inner tube (601) is connected to the microchannel evaporator inlet (711) via the second capillary tube (11); the microchannel evaporator outlet (712) is connected to the rear gaseous working medium inlet (622) of the energy recovery device jacket (602); and the gaseous mixed working medium outlet (623) of the energy recovery device jacket (602) is connected to the inlet of the compressor (3) via the air inlet pipe (12); The microchannel evaporator (7) further comprises a cold plate (703); the cold plate (703) is a flat plate, and the microchannel tube (702) is fixedly connected to the cold plate (703).

2. The cryogenic electronic screen separator using a microchannel cold plate as claimed in claim 1, characterized in that: The upper surface of the cold plate (703) is provided with a plurality of semicircular through grooves in parallel, and the microchannel tubes (702) are arranged on the through grooves; the plurality of microchannel tubes (702) are arranged in parallel on a plane, and the upper parts of the plurality of microchannel tubes (702) constitute a cooling surface.

3. The cryogenic electronic screen separator using a microchannel cold plate as claimed in claim 1, characterized in that: The microchannel tube (702) is welded to the flat surface of the cold plate (703); a plurality of microchannel tubes (702) are arranged in parallel on a plane, and the upper parts of the plurality of microchannel tubes (702) constitute a cooling surface.

4. The cryogenic electronic screen separator using a microchannel cold plate as claimed in claim 1, characterized in that: A plurality of circular through holes are opened in parallel through the cold plate (703); the microchannel tube (702) is arranged through the through holes, and the surface of the cold plate (703) serves as a cooling surface.

5. The cryogenic electronic screen separator using a microchannel cold plate as claimed in claim 1, characterized in that: The cold plate (703) is a metal plate, and a plurality of circular through holes are opened in parallel through two opposite sides of the cold plate (703), and the inner diameter of the through holes is D≤2mm, forming a microchannel tube (702); two evaporator main pipes (701) are fixedly arranged on both sides of the cold plate (703) and are connected through the microchannel tube (702); the surface of the cold plate (703) serves as a cooling surface.

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