Display cabinet glass door with high reflection and low penetration function

Abstract

The present application relates to the refrigeration technical field, specifically, it is a kind of display cabinet glass door with high reflection low penetration function, including glass door and infrared sensor for control circuit, glass door is from outside to inside in turn outer glass, heat insulation plate and inner glass, glass door is provided with frame assembly, frame assembly includes upper frame and lower frame, and upper frame is symmetrically arranged on the upper and lower of glass door;Upper frame middle part is equipped with first installation cavity, and first installation cavity is installed with switch assembly, and switch assembly includes electromagnet structure, and the magnetic attraction structure that is symmetrically arranged on the left and right of electromagnet structure upper side and adjustment structure.This glass door can be discolored by setting outer glass and cooperating switch assembly when light is strong, so that it realizes high reflection low penetration, and further ensures that the temperature in the display cabinet is not affected.

Description

Technical Field

[0001] This invention belongs to the field of refrigeration technology, specifically a display cabinet glass door with high reflectivity and low penetration. Background Technology

[0002] With the development of the display case refrigeration industry, various types of upright glass-door refrigerated boxes have appeared on the market. Their temperature range is generally from 0 to 10 degrees Celsius, and they are mostly used outdoors in direct sunlight. However, strong midday sunlight can easily cause the internal temperature to become unsustainable. Traditional display case glass doors have certain limitations when facing the issues of light transmission and heat conduction. Excessive light transmission can damage the products inside the display case with ultraviolet and visible light, while heat conduction increases energy consumption and affects temperature control within the display case.

[0003] For example, the invention patent with authorization announcement number CN114183050B proposes a glass door for a display cabinet in the field of refrigerated display cabinet technology. The glass includes a rectangular door frame and multiple layers of glass. The multiple layers of glass include an outer layer of glass, an inner layer of glass, and a middle layer of glass. The middle layer of glass has a reflective ink pattern. The outer and inner layers of glass are both rectangular and have equal areas. The outer and inner layers of glass are arranged opposite each other on the front and back sides of the rectangular door frame. The area of ​​the middle layer of glass is smaller than that of the outer layer of glass. The middle layer of glass includes a connecting straight edge and a cut. The connecting straight edge is flush with a straight edge of the outer layer of glass. A spotlight is provided at the flush position of the connecting straight edge.

[0004] Although the aforementioned glass doors can achieve lightweight design and avoid the excessive weight of traditional triple-layered glass doors, they still cannot prevent light transmission and heat conduction when used outdoors. In order to effectively reduce heat conduction and light transmission, thereby reducing the energy consumption of the display case and improving the display effect, and to solve the problem that existing vertical glass door refrigerators cannot maintain the internal temperature and have high energy consumption in summer, we propose a display case glass door with high reflectivity and low transmittance.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a display cabinet glass door with high reflectivity and low transmittance to solve the above-mentioned problems of the prior art.

[0007] To achieve the above objectives, the present invention provides a display cabinet glass door with high reflectivity and low penetration, comprising a glass door and an infrared sensor for control circuitry. The glass door consists of an outer glass, a heat insulation plate, and an inner glass from the outside to the inside. A frame assembly is provided on the glass door, comprising an upper frame and a lower frame symmetrically arranged above and below the glass door. The outer glass is specifically electrochromic glass, and the inner glass is double-layered vacuum glass. An inert gas is filled between the outer glass and the inner glass. The upper frame and the lower frame are provided with glass mounting grooves for fixing the glass door on their inner sides. A conductive sheet is provided in the middle of the front inner wall of the glass mounting groove, which contacts the outer glass. Filling holes are symmetrically provided in the middle of the bottom surface of the glass mounting groove on the lower frame on the front and back sides of the heat insulation plate.

[0008] The upper frame has a first mounting cavity in its middle, and a switch assembly is installed in the first mounting cavity. The switch assembly includes an electromagnet structure, a magnetic attraction structure symmetrically arranged above the electromagnet structure, and an adjustment structure. A placement block is embedded in the middle of the front side wall of the upper frame, and a thermistor is installed in the placement block. The electromagnet structure includes an electromagnet whose bottom surface is fixed to the middle of the bottom surface of the first mounting cavity, an insulating sheet fixedly adhered to the top surface of the electromagnet, and a pad fixedly adhered to the top of the insulating sheet. The magnetic attraction structure includes a fixing box and a sliding block arranged inside the fixing box. Sliding rods are symmetrically fixed in the fixing box, and a conductive block is fixedly connected to the bottom end of the sliding block. A movable block is provided near the top of the fixing box, and the sliding rod passes through the movable block and the two are slidably connected. The outer wall of the sliding rod is located on the top surface of the sliding block and the movable block is slidably connected. A first spring is provided between the bottom surfaces of the blocks. The two ends of the first spring are fixed to the top surface of the sliding block and the bottom surface of the movable block, respectively. A gasket is fixed to the upper outer wall of the fixed box. The gasket, the sliding rod, and the gasket are all made of conductive material. The conductive block is a permanent magnet. The gasket is frustum-shaped. The conductive block is an annular shape that matches the shape of the gasket, and the annular edges of the left and right conductive blocks do not contact each other. The top end of the sliding rod passes through the upper side wall of the fixed box and is fixed to the bottom surface of the gasket. A horizontal conductive plate is provided on the top surface of the first mounting cavity. The top surface of the gasket is fixed to the conductive plate. A connecting rod is provided in the middle of the top surface of the movable block. The top end of the connecting rod passes through the top surface of the fixed box and the gasket from bottom to top, and the top end face of the connecting rod is connected to the adjustment structure by a connecting rope.

[0009] In the technical solution of the present invention, the infrared sensor is installed on the front outer wall of the first mounting cavity, the placement block is made of transparent material and its vertical height is 3 times that of the thermistor, and the thermistor is connected in series with the electromagnet.

[0010] In the technical solution of the present invention, the bottom surface of the fixing box is open and the size of the opening is adapted to the size of the sliding block. A limiting groove is provided in the middle of the outer side wall inside the fixing box. A limiting block adapted to the limiting groove is fixed on the outer side wall of the sliding block near the central axis and the top. The vertical length of the limiting groove is less than the height of the fixing box.

[0011] In the technical solution of the present invention, a second mounting cavity is provided above the first mounting cavity near the top of the upper frame. The adjustment structure is located in the second mounting cavity. The adjustment structure includes an outer rod arranged horizontally in the second mounting cavity, a pressing rod installed in the outer rod, and a pin mechanism. The front end of the outer rod extends out of the front side wall of the second mounting cavity and is coaxially connected to a knob at the front end. A rotating groove is provided in the middle of the rear side wall of the second mounting cavity. The rear end of the outer rod is embedded in the rotating groove and can rotate. The side wall of the outer rod is connected to the connecting rod at the corresponding position by the connecting rope, and the winding directions of the left and right connecting ropes are opposite.

[0012] In the technical solution of the present invention, a pressing cavity is provided in the front half of the outer rod, and a rod sleeve is coaxially fixed on the inner bottom surface of the pressing cavity. The rear end of the pressing rod is inserted into the rod sleeve. A second spring is provided between the inner bottom surface of the rod sleeve and the rear end surface of the pressing rod. The front end of the pressing rod extends a certain distance from the middle of the knob. A rubber pressing cap is provided in the middle of the knob. The side wall of the pressing rod is provided with two outwardly extending symmetrical flanges.

[0013] In the technical solution of the present invention, a pin mechanism is provided on the outer side wall of the pressing rod corresponding to the portion passing through the front side wall of the second mounting cavity. The pin mechanism includes a pin rod, a push rod, and a third spring. The push rod is horizontally L-shaped and located in front of the pin rod. The vertical section of the push rod is fixed to the outer side wall of the pressing rod.

[0014] In the technical solution of the present invention, the pin rod consists of a pin part, a baffle part, and an inclined rod part from top to bottom. The front sidewall of the second mounting cavity is provided with a plurality of regularly distributed annular holes that are adapted to the pin part. The pin part passes through the sidewall of the pressing cavity and extends into the corresponding hole. The diameter of the baffle part is larger than the diameter of the pin part and the inclined rod part. A third spring is symmetrically provided on the left and right sides at the top edge of the baffle part. The two ends of the third spring are fixed to the top surface of the baffle part and the inner sidewall of the pressing cavity, respectively.

[0015] In the technical solution of the present invention, the front side of the inclined rod is an inclined surface that is lower in the front and higher in the back, and the rear end face of the horizontal end of the top rod is an inclined surface that fits against the inclined surface of the inclined rod. The height difference of the inclined surface of the inclined rod is less than the vertical distance from the bottom end of the inclined rod to the outer wall of the pressing rod. At the same time, the height difference of the inclined surface of the inclined rod is less than the distance from the top end of the pin to the inner wall of the outer rod when it is inserted, and greater than the distance from the top end of the pin to the outer wall of the outer rod when it is inserted.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] 1. In this invention, by setting up an electromagnet structure and a magnetic attraction structure, after the display cabinet is exposed to strong sunlight outdoors, the electromagnet will attract the conductive block, which will connect the circuit of the outer glass and darken the color of the outer glass. This effectively reduces heat conduction and light transmission, thereby reducing the energy consumption of the display cabinet and improving the display effect. This solves the problem that existing vertical glass door refrigerators cannot maintain the internal temperature and have high energy consumption in summer.

[0018] 2. In this invention, by setting an adjustment structure, the distance between the electromagnet and the conductive block can be adjusted by pressing the pressing rod and rotating the knob during use, thereby changing the resistance threshold required by the thermistor for the adsorption of the two, and thus changing the color change time of the outer glass according to the temperature requirements of the items placed in the display case.

[0019] 3. In this invention, by setting up a transparent heat insulation plate and filling the gap with inert gas, the heat conduction between the inner and outer glass is reduced, the energy efficiency of the display case is improved, and energy consumption is reduced. At the same time, by setting up an infrared sensor, the entire circuit is disconnected when a customer approaches, so that the products inside the display case can be clearly displayed and the display effect is not affected. Attached Figure Description

[0020] Figure 1 This is a simplified schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a cross-sectional view of the internal structure of the upper frame of the present invention;

[0022] Figure 3 This is an enlarged view of the structure at point A in this invention;

[0023] Figure 4 This is a cross-sectional view of the upper frame in this invention;

[0024] Figure 5 This is a cross-sectional view of the lower frame in this invention;

[0025] Figure 6 This is a schematic diagram of the electromagnet structure in this invention;

[0026] Figure 7This is an exploded view of the magnetic attraction structure in this invention;

[0027] Figure 8 This is a cross-sectional view of the adjustment structure in this invention;

[0028] Figure 9 This is an enlarged view of the structure at point B in this invention;

[0029] Figure 10 This is a schematic diagram of the pin structure in this invention;

[0030] Figure 11 This is a simplified circuit diagram of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Glass door; 11. Exterior glass; 12. Heat insulation panel; 13. Interior glass;

[0033] 2. Frame assembly; 21. Upper frame; 211. Glass mounting groove; 212. First mounting cavity; 213. Second mounting cavity; 2131. Insertion hole; 2132. Rotary groove; 22. Lower frame; 221. Filling hole;

[0034] 3. Switch assembly; 31. Infrared sensor; 32. Placement block; 33. Thermistor; 34. Conductive sheet; 35. Electromagnet structure; 351. Electromagnet; 352. Insulating sheet; 353. Pad; 36. Magnetic structure; 361. Fixing box; 362. Sliding block; 3621. Limiting block; 363. Conductive block; 364. Sliding rod; 365. First spring; 366. Limiting groove; 367. Movable block; 368. Connecting rod; 369. Pad 37. Adjustment structure; 371. Outer rod; 3711. Knob; 3712. Pressing chamber; 372. Pressing rod; 3721. Flange; 373. Rod sleeve; 374. Second spring; 375. Pin mechanism; 3751. Pin rod; 3751a. Pin part; 3751b. Baffle part; 3751c. Inclined rod part; 3752. Top rod; 3753. Third spring; 376. Pressing cap; 377. Connecting rope; 38. Conductive plate. Detailed Implementation

[0035] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0036] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0037] Reference Figures 1-11The present invention provides a display cabinet glass door with high reflectivity and low penetration, comprising a glass door 1 and an infrared sensor 31 for control circuitry. The glass door 1 consists of an outer glass 11, a heat insulation plate 12, and an inner glass 13 from the outside to the inside. A frame assembly 2 is provided on the glass door 1. The frame assembly 2 includes an upper frame 21 and a lower frame 22 symmetrically arranged above and below the glass door 1. The outer glass 11, the heat insulation plate 12, and the inner glass 13 are used to insulate the interior of the outdoor display cabinet, preventing the interior temperature of the display cabinet from rising under sunlight and affecting the cooling effect.

[0038] The upper frame 21 has a first mounting cavity 212 in the middle, and a switch assembly 3 is installed in the first mounting cavity 212. The switch assembly 3 includes an electromagnet structure 35, a magnetic attraction structure 36 symmetrically arranged on the left and right sides above the electromagnet structure 35, and an adjustment structure 37. A placement block 32 is embedded in the middle of the front side wall of the upper frame 21. A thermistor 33 is installed in the placement block 32. The electromagnet structure 35 includes an electromagnet 351 whose bottom surface is fixed in the middle of the bottom surface of the first mounting cavity 212, an insulating sheet 352 fixedly bonded to the top surface of the electromagnet 351, and a pad 353 bonded and fixed above the insulating sheet 352. When sunlight shines on the thermistor 33 for a period of time, its resistance decreases. Under the condition that the power supply remains unchanged, the current through the electromagnet 351 increases. At this time, the magnetic force of the electromagnet 351 will be enhanced, and then the conductive block 363 will be attracted downward.

[0039] The magnetic attraction structure 36 includes a fixed box 361 and a sliding block 362 disposed inside the fixed box 361. A sliding rod 364 is symmetrically fixed inside the fixed box 361. A conductive block 363 is fixedly connected to the bottom end of the sliding block 362. A movable block 367 is disposed near the top inside the fixed box 361. The sliding rod 364 passes through the movable block 367 and the two are slidably connected. A first spring 365 is disposed on the outer wall of the sliding rod 364 between the top surface of the sliding block 362 and the bottom surface of the movable block 367. The two ends of the first spring 365 are respectively connected to the sliding block 362. 2. The top surface and the bottom surface of the movable block 367 are fixed. A pad 369 is fixed on the upper outer wall of the fixed box 361. The top of the slide rod 364 passes through the upper side wall of the fixed box 361 and is fixed to the bottom surface of the pad 369. The top surface of the first mounting cavity 212 is provided with a horizontal conductive plate 38. The top surface of the pad 369 is fixed to the conductive plate 38. When the conductive block 363 is attracted downward to contact the pad 353, the circuit through the outer glass 11 is connected to make it energized and deepen the color, thereby effectively reducing heat conduction and light transmission of the glass door.

[0040] Specifically, the outer glass 11 is electrochromic glass, which can reversibly change its color when energized. The inner glass 13 is double-layered vacuum glass, and an inert gas is filled between the outer glass 11 and the inner glass 13. The inert gas and the heat insulation plate 12 can further improve the heat insulation effect of the glass door 1. The upper frame 21 and the lower frame 22 are provided with glass mounting grooves 211 for fixing and installing the glass door 1 on their inner sides. The middle of the front inner wall of the glass mounting groove 211 is provided with a conductive sheet 34 that contacts the outer glass 11. The conductive sheet 34 facilitates the connection of the outer glass 11 to the circuit. The bottom surface of the glass mounting groove 211 on the lower frame 22 is symmetrically provided with filling holes 221 on the front and back sides of the heat insulation plate 12, which facilitates the filling of inert gas into the interior during installation.

[0041] Furthermore, the infrared sensor 31 is mounted on the front outer wall of the first mounting cavity 212. The placement block 32 is made of transparent material and its vertical height is three times that of the thermistor 33, ensuring that the thermistor 33 can be exposed to sunlight, thereby increasing its temperature and reducing its resistance. The thermistor 33 is connected in series with the electromagnet 351. Figure 11 It is known that the infrared sensor 31 is installed in the main circuit to control the entire circuit. When someone approaches the display case and is detected by the infrared sensor 31, the entire circuit will be disconnected so that passersby can see the items inside the display case and make a purchase.

[0042] It is worth noting that, through Figure 11 It can be seen that when the outer glass 11 is connected to the circuit, the outer glass 11 and the thermistor 33 are connected in parallel. After connection, the current in the branch of the outer glass 11 and the current in the branch of the thermistor 33 are only related to the resistance value of their respective branches. Therefore, after connection, the current flowing through the thermistor 33 will not change, and thus will not affect the magnetic force of the electromagnet 351, causing it to be unable to attract the conductive block 363.

[0043] In addition, the bottom surface of the fixing box 361 is open and the size of the opening is adapted to the size of the sliding block 362. The middle of the outer side wall inside the fixing box 361 is provided with a limiting groove 366. The outer side wall of the sliding block 362 is fixed with a limiting block 3621 adapted to the limiting groove 366 near the central axis and top. When the conductive block 363 is attracted downward, it will drive the sliding block 362 to slide down along the limiting groove 366 and stretch the first spring 365 at the same time. The vertical length of the limiting groove 366 is less than the height of the fixing box 361 to prevent the sliding block 362 from sliding out of the fixing box 361.

[0044] Specifically, the pad 353, the slide bar 364, and the shim 369 are all made of conductive material, so that the circuit of the outer glass 11 can be connected when the conductive block 363 is in contact with the pad 353. The conductive block 363 is a permanent magnet, so that it can be attracted by the electromagnet 351. The pad 353 is frustum-shaped, and the conductive block 363 is an annular shape that matches the shape of the pad 353. The annular edges of the two conductive blocks 363 do not contact each other, thus avoiding direct contact between the two conductive blocks 363 and ensuring that the circuit of the outer glass 11 is always connected.

[0045] Furthermore, a second mounting cavity 213 is located above the first mounting cavity 212 and near the top of the upper frame 21. An adjustment structure 37 is located within the second mounting cavity 213. The adjustment structure 37 includes an outer rod 371 arranged laterally in the second mounting cavity 213, a pressing rod 372 installed within the outer rod 371, and a pin mechanism 375. The front end of the outer rod 371 protrudes through the front sidewall of the second mounting cavity 213 and is coaxially connected to a knob 3711 at its front end. A rotating groove 2132 is provided in the middle of the rear sidewall of the second mounting cavity 213. The rear end of the outer rod 371 is embedded in the rotating groove 2132 and can rotate. The sidewall of the outer rod 371 is connected to the connecting rod 368 at corresponding positions via connecting ropes 377. The two connecting ropes 377 are also connected. The winding direction of 77 is opposite. When different products are placed in the display case, the threshold of the electromagnet 351 attracting the conductive block 363 to connect the outer glass 11 can be adjusted as needed. That is, when using the display case for products with high temperature requirements, the knob 3711 can be turned to loosen the connecting rope 377. At this time, under the action of gravity, the sliding block 362, the movable block 367 and the first spring 365 will slide down a certain distance synchronously. At this time, the distance between the electromagnet 351 and the conductive block 363 becomes smaller, the required current becomes smaller, that is, the irradiation time of the thermistor 33 becomes shorter, so that the circuit of the outer glass 11 can be connected in a short time to make it change color and keep warm. When using the display case for products with low temperature requirements, simply rotate in the opposite direction.

[0046] The outer rod 371 has a pressing cavity 3712 in the front half. The inner bottom surface of the pressing cavity 3712 is coaxially fixed with a rod sleeve 373. The rear end of the pressing rod 372 is inserted into the rod sleeve 373. A second spring 374 is provided between the inner bottom surface of the rod sleeve 373 and the rear end surface of the pressing rod 372. The second spring 374 can help the pressing rod 372 to return to its original position after being pressed. The front end of the pressing rod 372 extends a certain distance from the middle of the knob 3711. The middle of the knob 3711 is provided with a rubber pressing cap 376. By pressing the pressing rod 372 inward, the pin mechanism 375 is driven to cancel the insertion, and the adjustment can be made as needed. The side wall of the pressing rod 372 has two outwardly extending symmetrical flanges 3721. The flanges 3721 can ensure that the pressing rod 372 rotates with the outer rod 371, while preventing the pressing rod 372 from rotating relative to the outer rod 371.

[0047] Furthermore, a pin mechanism 375 is provided on the outer side wall of the pressing rod 372 at the portion corresponding to the portion passing through the front side wall of the second mounting cavity 213. The pin mechanism 375 includes a pin rod 3751, a push rod 3752, and a third spring 3753. The push rod 3752 is horizontally L-shaped and located in front of the pin rod 3751. The vertical section of the push rod 3752 is fixed to the outer side wall of the pressing rod 372. By pressing the pressing rod 372, the push rod 3752 is pushed backward and then makes contact with the insertion.

[0048] Specifically, the pin rod 3751 consists of a pin portion 3751a, a baffle portion 3751b, and a beveled rod portion 3751c, arranged from top to bottom. The front side wall of the second mounting cavity 213 has several regularly distributed annular insertion holes 2131 that are adapted to the pin portion 3751a. The pin portion 3751a passes through the side wall of the pressing cavity 3712 and extends into the corresponding insertion hole 2131. The diameter of the baffle portion 3751b is larger than the diameters of the pin portion 3751a and the beveled rod portion 3751c. A third spring 3 is symmetrically provided on the left and right sides of the top edge of the baffle portion 3751b. 753, the two ends of the third spring 3753 are fixed to the top surface of the baffle part 3751b and the inner wall of the pressing cavity 3712, respectively. When the pressing rod 372 is pressed and the push rod 3752 is pushed backward, because the push rod 3752 and the inclined rod part 3751c are in contact with the inclined surface, the pin rod 3751 will move downward, thus causing it to exit the insertion hole 2131. When the pressing rod 372 is released, the third spring 3753 will pull up the baffle part 3751b and drive the pin part 3751a to re-enter the insertion hole 2131, thus ensuring the insertion is fixed.

[0049] It is worth noting that the front side of the inclined rod 3751c is an inclined surface that is lower in the front and higher in the back. The rear end face of the horizontal end of the top rod 3752 is an inclined surface that fits against the inclined surface of the inclined rod 3751c. The height difference of the inclined surface of the inclined rod 3751c is less than the vertical distance from the bottom end of the inclined rod 3751c to the outer wall of the pressing rod 372, ensuring that the pin rod 3751 has enough space to move up and down. At the same time, the height difference of the inclined surface of the inclined rod 3751c is less than the distance from the top of the pin part 3751a to the inner wall of the outer rod 371 when it is inserted, but greater than the distance from the top of the pin part 3751a to the outer wall of the outer rod 371 when it is inserted. This further ensures that the pin rod 3751 can be withdrawn from the insertion hole 2131 without being separated from the constraint of the outer rod 371.

[0050] The working principle of a display cabinet glass door with high reflectivity and low transmittance function according to the present invention is as follows:

[0051] When using a product display case with high temperature requirements, the knob 3711 can be turned to loosen the connecting rope 377. At this time, under the action of gravity, the sliding block 362, the movable block 367, and the first spring 365 will slide down a certain distance in sync. At this time, the distance between the electromagnet 351 and the conductive block 363 becomes smaller, the magnetic force required for the electromagnet 351 to attract the conductive block 363 becomes smaller, that is, the required current becomes smaller, and the irradiation time of the thermistor 33 becomes shorter. This allows the circuit of the outer glass 11 to be connected in a short time, causing it to change color and keep warm. When using a product display case with low temperature requirements, simply rotate in the opposite direction.

[0052] During use, when sunlight shines on the thermistor 33 for a period of time, its resistance will decrease. With the power supply unchanged, the current through the electromagnet 351 will increase. At this time, the magnetic force of the electromagnet 351 will be strengthened, and the conductive block 363 will be attracted downwards, thereby connecting the circuit of the outer glass 11. At night, the thermistor 33 cannot be exposed to light and cannot heat up, thus preventing the circuit of the outer glass 11 from being connected, thereby reducing power consumption. In addition, when someone approaches the display case and is detected by the infrared sensor 31, the entire circuit will be disconnected, allowing passersby to see the items inside the display case and make purchases.

[0053] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A display case glass door with high reflectivity and low transmittance, comprising a glass door (1) and an infrared sensor (31) for a control circuit, characterized in that: The glass door (1) consists of an outer glass (11), a heat insulation plate (12), and an inner glass (13) from the outside to the inside. A frame assembly (2) is provided on the glass door (1). The frame assembly (2) includes an upper frame (21) and a lower frame (22) symmetrically arranged above and below the glass door (1). The outer glass (11) is electrochromic glass, and the inner glass (13) is double-layer vacuum glass. An inert gas is filled between the outer glass (11) and the inner glass (13). The upper frame (21) and the lower frame (22) are provided with glass mounting grooves (211) for fixing the glass door (1) on their inner side. A conductive sheet (34) is provided in the middle of the inner wall of the front side of the glass mounting groove (211) to contact the outer glass (11). The bottom surface of the glass mounting groove (211) on the lower frame (22) is symmetrically provided with filling holes (221) on the front and back sides of the heat insulation plate (12). The upper frame (21) has a first mounting cavity (212) in the middle, and a switch assembly (3) is installed in the first mounting cavity (212). The switch assembly (3) includes an electromagnet structure (35), a magnetic attraction structure (36) symmetrically arranged on the left and right sides above the electromagnet structure (35), and an adjustment structure (37). A placement block (32) is embedded in the middle of the front side wall of the upper frame (21), and a thermistor (33) is provided in the placement block (32). The electromagnet structure (35) includes an electromagnet (351) whose bottom surface is fixed to the middle of the bottom surface of the first mounting cavity (212), and an electromagnet (351) whose top surface is fixedly bonded. The insulating sheet (352) and the pad (353) bonded and fixed above the insulating sheet (352) are included. The magnetic attraction structure (36) includes a fixed box (361) and a sliding block (362) disposed inside the fixed box (361). Sliding rods (364) are symmetrically fixed in the fixed box (361). A conductive block (363) is fixedly connected to the bottom end of the sliding block (362). A movable block (367) is disposed near the top of the fixed box (361). The sliding rod (364) passes through the movable block (367) and the two are slidably connected. The outer wall of the sliding rod (364) is located on the top surface of the sliding block (362) and A first spring (365) is provided between the bottom surfaces of the movable block (367). The two ends of the first spring (365) are fixed to the top surface of the sliding block (362) and the bottom surface of the movable block (367), respectively. A gasket (369) is fixed to the upper outer wall of the fixing box (361). The gasket (353), the sliding rod (364), and the gasket (369) are all made of conductive material. The conductive block (363) is a permanent magnet. The gasket (353) is frustum-shaped. The conductive block (363) is annular and its shape is adapted to the shape of the gasket (353). The annular edges of the two conductive blocks (363) are not... The slide rod (364) is in contact with each other. The top end of the slide rod (364) passes through the upper side wall of the fixed box (361) and is fixed to the bottom surface of the pad (369). The top surface of the first mounting cavity (212) is provided with a horizontal conductive plate (38). The top surface of the pad (369) is fixed to the conductive plate (38). The top surface of the movable block (367) is provided with a connecting rod (368). The top end of the connecting rod (368) passes through the top surface of the fixed box (361) and the pad (369) from bottom to top. The top end face of the connecting rod (368) is connected to the adjustment structure (37) by a connecting rope (377).

2. A display case glass door with high reflectivity and low transmittance as described in claim 1, characterized in that: The infrared sensor (31) is installed on the front outer wall of the first mounting cavity (212). The placement block (32) is made of transparent material and its height is 3 times that of the thermistor (33). The thermistor (33) is connected in series with the electromagnet (351).

3. A display case glass door with high reflectivity and low transmittance as described in claim 1, characterized in that: The bottom surface of the fixed box (361) is open and the size of the opening is adapted to the size of the sliding block (362). The fixed box (361) has a limiting groove (366) in the middle of the outer side wall. The outer side wall of the sliding block (362) is fixed with a limiting block (3621) adapted to the limiting groove (366) near the central axis and the top. The vertical length of the limiting groove (366) is less than the height of the fixed box (361).

4. A display case glass door with high reflectivity and low transmittance as described in claim 1, characterized in that: The upper frame (21) is provided with a second mounting cavity (213) located above the first mounting cavity (212) near the top. The adjustment structure (37) is located in the second mounting cavity (213). The adjustment structure (37) includes an outer rod (371) arranged horizontally in the second mounting cavity (213), a pressing rod (372) installed in the outer rod (371), and a pin mechanism (375). The front end of the outer rod (371) extends out of the front side wall of the second mounting cavity (213) and a knob (3711) is coaxially connected to the front end. A rotating groove (2132) is provided in the middle of the rear side wall of the second mounting cavity (213). The rear end of the outer rod (371) is embedded in the rotating groove (2132) and can rotate. The side wall of the outer rod (371) is connected to the connecting rod (368) at the corresponding position by the connecting rope (377), and the two connecting ropes (377) are wound in opposite directions.

5. A display case glass door with high reflectivity and low transmittance as described in claim 4, characterized in that: The outer rod (371) has a pressing cavity (3712) in the front half. A rod sleeve (373) is coaxially fixed to the inner bottom surface of the pressing cavity (3712). The rear end of the pressing rod (372) is inserted into the rod sleeve (373). A second spring (374) is provided between the inner bottom surface of the rod sleeve (373) and the rear end surface of the pressing rod (372). The front end of the pressing rod (372) extends a certain distance from the middle of the knob (3711). A rubber pressing cap (376) is provided in the middle of the knob (3711). The side wall of the pressing rod (372) has two outwardly extending symmetrical flanges (3721).

6. A display case glass door with high reflectivity and low transmittance as described in claim 5, characterized in that: The outer wall of the pressing rod (372) is provided with a pin mechanism (375) at the part that passes through the front side wall of the second mounting cavity (213). The pin mechanism (375) includes a pin rod (3751), a push rod (3752) and a third spring (3753). The push rod (3752) is horizontally L-shaped and located in front of the pin rod (3751). The vertical section of the push rod (3752) is fixed at the outer wall of the pressing rod (372).

7. A display case glass door with high reflectivity and low transmittance as described in claim 6, characterized in that: The pin rod (3751) consists of a pin part (3751a), a baffle part (3751b), and a beveled rod part (3751c) arranged from top to bottom. The front sidewall of the second mounting cavity (213) is provided with a plurality of regularly distributed annular insertion holes (2131) that are adapted to the pin part (3751a). The pin part (3751a) extends through the sidewall of the pressing cavity (3712) and into the corresponding insertion hole (2131). The diameter of the baffle part (3751b) is larger than the diameter of the pin part (3751a) and the beveled rod part (3751c). A third spring (3753) is symmetrically provided on the left and right sides of the top edge of the baffle part (3751b). The two ends of the third spring (3753) are fixed to the top surface of the baffle part (3751b) and the inner sidewall of the pressing cavity (3712), respectively.

8. A display case glass door with high reflectivity and low transmittance as described in claim 7, characterized in that: The front side of the inclined rod (3751c) is an inclined surface that is lower in the front and higher in the back. The rear end face of the horizontal end of the top rod (3752) is an inclined surface that fits against the inclined surface of the inclined rod (3751c). The height difference of the inclined surface of the inclined rod (3751c) is less than the vertical distance from the bottom end of the inclined rod (3751c) to the outer wall of the pressing rod (372). At the same time, the height difference of the inclined surface of the inclined rod (3751c) is less than the distance from the top end of the pin (3751a) to the inner wall of the outer rod (371) when it is inserted, and greater than the distance from the top end of the pin (3751a) to the outer wall of the outer rod (371) when it is inserted.

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