Low-temperature-resistant gear flowmeter

Abstract

The invention relates to the technical field of gear flow meters, and discloses a low-temperature-resistant gear flow meter which comprises a low-temperature anti-freezing mechanism, a threaded seat is fixedly mounted at the bottom of a bottom plate, a connecting disc is movably mounted at the bottom of the bottom plate, and a fixing rod is rotationally connected into the connecting disc; a heating box is fixedly installed at the bottom of the connecting disc, and an oil storage tank, a coil pipe, a conveying pump and a fan are installed in the heating box. According to the low-temperature-resistant gear flow meter, through the low-temperature anti-freezing mechanism, when the environment temperature is lower than a set value, an electric heater heats heat conduction oil in an oil storage tank, and heat is transmitted to a meter head through a coil pipe and a conveying pump via a threaded pipeline connector; meanwhile, the fan is located at the top of the coil pipe, and heat is extracted and dispersed to be evenly distributed to the gear transmission box through the air supply pipe; the working temperature of the gear transmission box and the gauge outfit is maintained in the process, and performance reduction or failure of the gear flowmeter caused by low temperature is prevented.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of gear flowmeters, in particular to a low-temperature-resistant gear flowmeter. BACKGROUND

[0002] The gear flowmeter is a volumetric flow measuring instrument widely used in petroleum, chemical industry, pharmaceutical industry and the like; the working principle is to measure the volumetric flow of fluid through the rotation of a pair of intermeshing gears; when the fluid passes through the gap between the gears, the gears rotate, and the rotation speed is proportional to the flow of the fluid; the sensor detects the rotation of the gears and converts the signal into readable flow data.

[0003] In an extremely low-temperature environment (for example, below -20 DEG C), the existing gear flowmeter faces significant technical challenges, the electronic elements in the display and control assembly have performance decline or even failure at low temperature, resulting in failure to accurately display flow data or control system failure; the liquid crystal display (LCD) has slow response and reduced contrast, affecting the clarity of the reading; the battery efficiency is reduced, shortening the use time of the equipment, in addition, the low temperature also makes the lubricating oil or lubricating grease become viscous or even solidify, increasing the friction between the gears, resulting in increased starting torque, which may cause the gears to be stuck or the wear to be intensified, and therefore the application provides a low-temperature-resistant gear flowmeter. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the defects of the prior art, the application provides a low-temperature-resistant gear flowmeter, which has the advantages of effectively reducing the failure rate of the gear flowmeter in a low-temperature environment, and solves the problems that the electronic elements in the display and control assembly have performance decline or even failure at low temperature, resulting in failure to accurately display flow data or control system failure; the liquid crystal display (LCD) has slow response and reduced contrast, affecting the clarity of the reading; the battery efficiency is reduced, shortening the use time of the equipment, in addition, the low temperature also makes the lubricating oil or lubricating grease become viscous or even solidify, increasing the friction between the gears, resulting in increased starting torque, which may cause the gears to be stuck or the wear to be intensified.

[0006] (II) Technical solutions

[0007] In order to achieve the above purpose of effectively reducing the failure rate of the gear flowmeter in a low-temperature environment, the application provides the following technical solutions: a low-temperature-resistant gear flowmeter, comprising a meter head, a connecting flange is installed at the bottom of the meter head, a gear transmission box is installed at the bottom of the connecting flange, mounting flanges are installed at the left and right sides of the gear transmission box, a bottom plate is fixedly installed at the bottom of the gear transmission box, and a low-temperature anti-freezing mechanism is installed at the bottom of the bottom plate.

[0008] The low-temperature antifreeze mechanism includes a threaded seat, a connecting plate, a fixing rod, a heating box, an oil storage tank, a coil, a delivery pump, a fan, an electric heater, a fixing plate, a mounting ring, a first heat-insulating cover, a threaded rod, an air supply pipe, a threaded ring, a second heat-insulating cover, a connecting ring, a spiral heat-conducting pipe, a threaded pipe connector, a protective cover and an acrylic plate. The bottom of the base plate is fixedly installed with a threaded seat, the bottom of the base plate is movably installed with a connecting plate, the interior of the connecting plate is rotatably connected to a fixing rod, the bottom of the connecting plate is fixedly installed with a heating box, the interior of the heating box is installed with an oil storage tank, a coil, a delivery pump and a fan, the interior of the oil storage tank is fixedly installed with an electric heater, the exterior of the connecting flange A fixing plate is fixedly installed, a mounting ring is fixedly installed on the bottom of the fixing plate, a first heat-insulating cover is movably installed on the outside of the mounting ring, threaded rods are rotatably connected on the left and right sides of the mounting ring, a number of air supply pipes are fixedly installed on the inner wall of the first heat-insulating cover, a threaded ring is fixedly installed on the top of the fixing plate, a second heat-insulating cover is movably installed on the top of the fixing plate, a connecting ring is fixedly installed on the bottom of the second heat-insulating cover, a spiral heat-conducting pipe is fixedly installed on the inner wall of the second heat-insulating cover, threaded pipe connectors are installed on the left and right sides of the second heat-insulating cover, a protective cover is plugged into the top of the second heat-insulating cover, and an acrylic plate is fixedly installed on the inside of the protective cover.

[0009] Preferably, the connecting plate is installed on the bottom of the base plate through a fixing rod, and the fixing rod is threadedly connected to the threaded seat. The left and right ends of the coil are respectively connected to the oil storage tank and the delivery pump. The fan is fixedly installed on the inner top wall of the heating box and is located on the top of the coil.

[0010] Preferably, a number of air ducts are installed on the top of the fan, and the ends of the air ducts away from the fan are respectively connected to a number of air supply ducts. A plug-in ring is fixedly installed on the top of the connecting plate. There are two first thermal insulation covers, and the opposite sides are in contact with each other. The bottoms of the two first thermal insulation covers are plugged into the plug-in ring.

[0011] Preferably, the two threaded rods both pass through the mounting ring and are respectively threadedly connected to the two first heat-insulating covers, and the second heat-insulating cover is threadedly connected to the threaded ring through the connecting ring at the bottom.

[0012] Preferably, the left and right ends of the spiral heat pipe are respectively connected to one end of two threaded pipe connectors extending to the inside of the second heat insulation cover, and the spiral heat pipe is located outside the meter head and does not contact the meter head.

[0013] Preferably, the two threaded pipe connectors are located on one end of the outer surface of the second insulation cover and are respectively installed with an injection pipe and a return pipe, the bottom of the injection pipe is connected to the right side of the delivery pump, and the bottom of the return pipe is connected to the oil storage tank.

[0014] Preferably, a plug-in slot is provided on the top of the second heat-insulating cover, the bottom of the protective cover is plugged into the plug-in slot, the acrylic plate is located in the center of the protective cover, and the acrylic plate is made of transparent acrylic material.

[0015] Preferably, the first heat-insulating cover and the second heat-insulating cover are both composed of a 316L stainless steel outer layer, an aluminum foil heat-reflecting layer and a polyurethane foam inner layer, and the aluminum foil heat-reflecting layer is located between the 316L stainless steel outer layer and the polyurethane foam inner layer.

[0016] (3) Beneficial effects

[0017] Compared with the prior art, the present invention provides a low-temperature resistant gear flowmeter with the following features:

[0018] Beneficial effects:

[0019] 1. This low-temperature-resistant gear flowmeter uses a low-temperature antifreeze mechanism. When the ambient temperature is lower than the set value, the electric heater heats the thermal oil in the oil storage tank, and the coil and delivery pump transfer the heat to the meter head through the threaded pipe connector. At the same time, the fan located on the top of the coil extracts and disperses the heat evenly to the gear transmission box through the air supply pipe. This process maintains the operating temperature of the gear transmission box and the meter head, preventing performance degradation or failure of the gear flowmeter due to low temperatures.

[0020] 2. The low-temperature-resistant gear flowmeter has a first insulation cover and a second insulation cover, both of which are made of a 316L stainless steel outer layer, an aluminum foil heat-reflective layer, and a polyurethane foam inner layer. This can further prevent the intrusion of cold air, greatly improving the equipment's operating reliability and service life in cold conditions, ensuring that measurement accuracy is not affected by the low-temperature environment, and providing a more stable flowmeter usage experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the planar structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the low-temperature antifreeze mechanism of the present invention;

[0024] Figure 4 A three-dimensional schematic diagram of the structure of the fixing plate, the mounting ring and the first heat-insulating cover of the present invention;

[0025] Figure 5 A schematic diagram of the three-dimensional structure of the threaded ring and the second heat-insulating cover of the present invention;

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the protective cover of the present invention.

[0027] In the figure: 1, meter head; 2, connecting flange; 3, gear transmission box; 4, mounting flange; 5, bottom plate; 6, low temperature anti-freezing mechanism; 601, threaded seat; 602, connecting disc; 603, fixed rod; 604, heating box; 605, oil storage tank; 606, coil pipe; 607, delivery pump; 608, fan; 609, electric heater; 610, fixed disc; 611, mounting ring; 612, first heat preservation cover; 613, threaded rod; 614, air supply pipe; 615, threaded ring; 616, second heat preservation cover; 617, connecting ring; 618, spiral heat conducting pipe; 619, threaded pipe connector; 620, protective cover; 621, acrylic plate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0029] Embodiment one:

[0030] Please refer to Figure 1-6 A low-temperature-resistant gear flowmeter, comprising a meter head 1, a connecting flange 2 is installed at the bottom of the meter head 1, a gear transmission box 3 is installed at the bottom of the connecting flange 2, mounting flanges 4 are installed on the left and right sides of the gear transmission box 3, a bottom plate 5 is fixedly installed at the bottom of the gear transmission box 3, and a low temperature anti-freezing mechanism 6 is installed at the bottom of the bottom plate 5.

[0031] The low-temperature antifreeze mechanism 6 includes a threaded seat 601, a connecting plate 602, a fixing rod 603, a heating box 604, an oil storage tank 605, a coil 606, a delivery pump 607, a fan 608, an electric heater 609, a fixing plate 610, a mounting ring 611, a first heat-insulating cover 612, a threaded rod 613, an air supply pipe 614, a threaded ring 615, a second heat-insulating cover 616, a connecting ring 617, a spiral heat-conducting pipe 618, a threaded pipe connector 619, a protective cover 620 and an acrylic plate 621. The threaded seat 601 is fixedly installed at the bottom of the bottom plate 5, and the connecting plate 602 is movably installed at the bottom of the bottom plate 5. The fixing rod 603 is rotatably connected to the inside of the connecting plate 602. The heating box 604 is fixedly installed at the bottom of the connecting plate 602. The oil storage tank 605, the coil 606, the delivery pump 607 and the fan 608 are installed inside the heating box 604. An electric heater 609 is fixedly installed on the outside of the connecting flange 2, a fixed plate 610 is fixedly installed on the outside of the fixing plate 610, a mounting ring 611 is fixedly installed on the bottom of the fixing plate 610, a first thermal insulation cover 612 is movably installed on the outside of the mounting ring 611, threaded rods 613 are rotatably connected to the left and right sides of the mounting ring 611, a number of air supply pipes 614 are fixedly installed on the inner wall of the first thermal insulation cover 612, a threaded ring 615 is fixedly installed on the top of the fixing plate 610, a second thermal insulation cover 616 is movably installed on the top of the fixing plate 610, a connecting ring 617 is fixedly installed on the bottom of the second thermal insulation cover 616, a spiral heat-conducting pipe 618 is fixedly installed on the inner wall of the second thermal insulation cover 616, threaded pipe connectors 619 are installed on the left and right sides of the second thermal insulation cover 616, a protective cover 620 is plugged into the top of the second thermal insulation cover 616, and an acrylic plate 621 is fixedly installed inside the protective cover 620.

[0032] Example 2:

[0033] The low-temperature resistant gear flowmeter of the present invention is particularly critical in the design of its low-temperature antifreeze mechanism 6; it is the core component that ensures the normal operation of the gear flowmeter in an extremely low-temperature environment; when the ambient temperature is lower than the preset value, the electric heater 609 located inside the heating box 604 is started to heat the thermal oil in the oil storage tank 605; the heated thermal oil is pumped into the spiral heat pipe 618 through the action of the delivery pump 607, and the spiral heat pipe 618 surrounds the meter head 1, so that heat can be evenly transferred to the meter head 1 to maintain its internal working temperature.

[0034] In addition, the fan 608 is installed on the top wall of the heating box 604 and is located on the top of the coil 606. It is responsible for extracting and dispersing the heat from the coil 606; the fan 608 transmits the hot air to various parts of the gear transmission box 3 through the air supply pipe 614.

[0035] This heating method not only solves the problem of performance degradation of electronic components under low temperature conditions, but also prevents lubricating oil or grease from becoming viscous or even solidifying due to low temperature, thereby avoiding the risk of gear jamming or increased wear. Therefore, in actual applications, even in extremely cold weather, the gear flowmeter can maintain good working condition and provide users with accurate and reliable flow measurement services.

[0036] Example 3:

[0037] In the low-temperature-resistant gear flowmeter of the present invention, the spiral heat pipe 618 plays a vital role; this component is installed inside the second insulation cover 616, and its two ends are respectively connected to two threaded pipe connectors 619 to form a closed circulation system; the existence of the spiral heat pipe 618 is not only to increase the length of the heat conduction path, but more importantly, it can significantly improve the heat exchange efficiency of the entire system.

[0038] The working principle of the spiral heat pipe 618 is based on the turbulence effect in fluid dynamics; when the heat transfer oil flows through the spiral heat transfer pipe 618 driven by the delivery pump 607, the special shape of the pipe causes the liquid to produce strong turbulence, thereby enhancing the heat transfer effect; this means that even in a very low temperature environment, the heat transfer oil can quickly transfer the heat generated by the heating box 604 to the meter head 1, ensuring that the components inside the meter head 1 are always within a suitable operating temperature range; in addition, the spiral structure can also reduce the pressure loss during the flow of the heat transfer oil, thereby improving the energy utilization efficiency of the system.

[0039] It is worth noting that in order not to affect the original mechanical properties of the gear flowmeter, the spiral heat pipe 618 is specially designed not to directly contact the meter head 1, but to indirectly heat it through radiation and convection. This design not only ensures the effective transfer of heat, but also does not introduce additional stress or vibration sources due to physical contact, thereby protecting the safety and reliability of precision instruments. In short, through the carefully designed spiral heat pipe 618, the present invention achieves high-efficiency and stable operation under low-temperature conditions, providing a more reliable technical solution for the industrial field.

[0040] Example 4:

[0041] The low-temperature-resistant gear flowmeter of the present invention has a transparent acrylic plate 621 disposed inside the protective cover 620. This design is intended to optimize the user's reading experience in low-temperature environments. The acrylic plate 621 has excellent light transmittance and UV resistance, and can effectively protect against the influence of adverse external climatic conditions while ensuring visual clarity. Especially in cold regions, ordinary plastics may become brittle or even crack, but the acrylic plate material, due to its special molecular structure, can still maintain flexibility and strength at low temperatures and is not easily damaged.

[0042] In addition, the protective cover 620 itself adopts a plug-in design, and the bottom matches the plug-in slot opened on the top of the second thermal insulation cover 616 to ensure the sealing between the two; this structure not only helps to maintain a warm microclimate inside, but also can block the entry of wind, snow and other impurities, further protecting the internal electronic components from damage; in short, by introducing acrylic board 621 as the window material, the present invention greatly improves the display quality in low temperature environment, bringing better use experience to users.

[0043] Embodiment 5:

[0044] The low-temperature-resistant gear flowmeter of the present invention, the first thermal insulation cover 612 and the second thermal insulation cover 616 are both constructed of composite materials, each of which is composed of a 316L stainless steel outer layer, an aluminum foil heat-reflecting layer and a polyurethane foam inner layer; the design of this multi-layer structure is not accidental, but is the result of a deep understanding of the principles of thermodynamics; first, 316L stainless steel, as a high-strength alloy steel, has excellent corrosion resistance and mechanical strength, and can effectively resist complex outdoor environmental factors such as salt spray erosion, ensuring long-term stability; secondly, the aluminum foil heat-reflecting layer sandwiched in the middle plays a role in reflecting external heat radiation, reducing the possibility of external cold being transferred inward, and reducing energy consumption.

[0045] The innermost layer of polyurethane foam is a highly efficient thermal insulation material with a very low thermal conductivity, which means that even if the outside temperature drops sharply, the internal heat is not easily dissipated; these three layers work together to form a tight thermal insulation barrier, which greatly improves the working reliability of the gear flowmeter under severe cold conditions; in addition to the functions mentioned above, the double-layer insulation cover also takes into special consideration the need for maintenance convenience; for example, the first insulation cover 612 and the second insulation cover 616 can be disassembled through the threaded rod 613, which is convenient for regular inspection or replacement of internal parts; and the fitting surface between the two is designed to be very tight, leaving almost no gaps, so as to maximize the prevention of cold air intrusion; therefore, with these unique structural features, the present invention not only extends the service life of the equipment, but also reduces the subsequent maintenance costs, saving users a lot of resources.

[0046] To sum up, the low-temperature resistant gear flowmeter uses the low-temperature antifreeze mechanism 6. When the ambient temperature is lower than the set value, the electric heater 609 heats the thermal oil in the oil storage tank 605, and the coil 606 and the delivery pump 607 transfer the heat to the meter head 1 through the threaded pipe connector 619; at the same time, the fan 608 is located on the top of the coil 606, extracting and dispersing the heat and evenly distributing it to the gear transmission box 3 through the air supply pipe 614; this process maintains the working temperature of the gear transmission box 3 and the meter head 1, preventing the performance degradation or failure of the gear flowmeter due to low temperature.

[0047] And, the low-temperature resistant gear flowmeter, the first heat preservation cover 612 and the second heat preservation cover 616 are both composed of a 316L stainless steel outer layer, an aluminum foil heat reflection layer and a polyurethane foam inner layer, which can further prevent cold air from invading, greatly improve the working reliability and service life of the equipment in cold conditions, ensure that the measurement accuracy is not affected by the low-temperature environment, provide a more stable flowmeter use experience, solve the problem that the electronic elements in the display and control components may be degraded or even fail at low temperatures, resulting in inaccurate display of flow data or failure of the control system; the liquid crystal display LCD is slow to respond, the contrast is reduced, and the reading clarity is affected; the battery efficiency is reduced, and the use time of the equipment is shortened. In addition, low temperature can also make the lubricating oil or grease become viscous or even solidify, increase the friction between the gears, increase the starting torque, and may cause the gears to jam or wear out.

[0048] It should be noted that, in the present text, relational terms such as first and second and the like can only be used to distinguish one entity or action from another entity or action, without necessarily requiring or implying that there is any such actual relationship or order between these entities or actions. Moreover, the terms "comprises", "comprising" or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or apparatus that includes a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0049] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the following claims and their equivalents.

Claims

1. A low-temperature resistant gear flowmeter, comprising a meter head (1), characterized in that: A connecting flange (2) is installed at the bottom of the meter head (1), a gear transmission box (3) is installed at the bottom of the connecting flange (2), mounting flanges (4) are installed on both the left and right sides of the gear transmission box (3), a bottom plate (5) is fixedly installed at the bottom of the gear transmission box (3), and a low-temperature antifreeze mechanism (6) is installed at the bottom of the bottom plate (5); The low-temperature antifreeze mechanism (6) comprises a threaded seat (601), a connecting plate (602), a fixing rod (603), a heating box (604), an oil storage tank (605), a coil (606), a delivery pump (607), a fan (608), an electric heater (609), a fixing plate (610), a mounting ring (611), a first heat-insulating cover (612), a threaded rod (613), an air supply pipe (614), a threaded ring (615), a second heat-insulating cover (616), a connecting ring (617), a spiral heat-conducting pipe (618), a threaded pipe connecting ring (619), a spiral heat-conducting pipe (620), and a threaded pipe connecting ring (621). The bottom of the base plate (5) is fixedly mounted with a threaded seat (601), the bottom of the base plate (5) is movably mounted with a connecting plate (602), the interior of the connecting plate (602) is rotatably connected with a fixing rod (603), the bottom of the connecting plate (602) is fixedly mounted with a heating box (604), the interior of the heating box (604) is mounted with an oil storage tank (605), a coil (606), a delivery pump (607) and a fan (608), the oil storage tank ( 605) is fixedly installed with an electric heater (609), the outside of the connecting flange (2) is fixedly installed with a fixed plate (610), the bottom of the fixed plate (610) is fixedly installed with a mounting ring (611), the outside of the mounting ring (611) is movably installed with a first heat preservation cover (612), the left and right sides of the mounting ring (611) are rotatably connected with threaded rods (613), the inner wall of the first heat preservation cover (612) is fixedly installed with a plurality of air supply pipes (614), the top of the fixed plate (610) is fixedly installed with a screw thread. A grooved ring (615) is provided, a second heat-insulating cover (616) is movably installed on the top of the fixed plate (610), a connecting ring (617) is fixedly installed on the bottom of the second heat-insulating cover (616), a spiral heat-conducting pipe (618) is fixedly installed on the inner wall of the second heat-insulating cover (616), threaded pipe connectors (619) are installed on both the left and right sides of the second heat-insulating cover (616), a protective cover (620) is plugged into the top of the second heat-insulating cover (616), and an acrylic plate (621) is fixedly installed inside the protective cover (620).

2. The low-temperature-resistant gear flowmeter according to claim 1, characterized in that: The connecting plate (602) is mounted on the bottom of the base plate (5) via a fixing rod (603), and the fixing rod (603) is threadedly connected to the threaded seat (601). The left and right ends of the coil (606) are respectively connected to the oil storage tank (605) and the delivery pump (607). The fan (608) is fixedly mounted on the inner top wall of the heating box (604) and is located on the top of the coil (606).

3. The low-temperature-resistant gear flowmeter according to claim 1, characterized in that: A number of air ducts are installed on the top of the fan (608), and the ends of the air ducts away from the fan (608) are respectively connected to a number of air supply pipes (614). A plug-in ring is fixedly installed on the top of the connecting plate (602). There are two first thermal insulation covers (612), and the opposite sides are fitted together. The bottoms of the two first thermal insulation covers (612) are plugged into the plug-in ring.

4. The low-temperature-resistant gear flowmeter according to claim 1, characterized in that: The two threaded rods (613) both pass through the mounting ring (611) and are respectively threadedly connected to the two first heat-insulating covers (612); the second heat-insulating cover (616) is threadedly connected to the threaded ring (615) via the connecting ring (617) at the bottom.

5. The low-temperature-resistant gear flowmeter according to claim 1, characterized in that: The left and right ends of the spiral heat-conducting pipe (618) are respectively connected to one end of two threaded pipe connectors (619) extending to the inside of the second heat-insulating cover (616); the spiral heat-conducting pipe (618) is located outside the meter head (1) and does not contact the meter head (1).

6. The low-temperature-resistant gear flowmeter according to claim 1, characterized in that: The two threaded pipe connectors (619) are located on one end of the outer surface of the second heat-insulating cover (616), and are respectively installed with a liquid injection pipe and a liquid return pipe. The bottom of the liquid injection pipe is connected to the right side of the delivery pump (607), and the bottom of the liquid return pipe is connected to the oil storage tank (605).

7. The low-temperature-resistant gear flowmeter according to claim 1, characterized in that: The top of the second heat-insulating cover (616) is provided with a plug-in slot, and the bottom of the protective cover (620) is plugged into the plug-in slot. The acrylic plate (621) is located in the center of the protective cover (620), and the acrylic plate (621) is made of transparent acrylic material.

8. The low-temperature-resistant gear flowmeter according to claim 1, characterized in that: The first heat-insulating cover (612) and the second heat-insulating cover (616) are both composed of a 316L stainless steel outer layer, an aluminum foil heat-reflecting layer, and a polyurethane foam inner layer, wherein the aluminum foil heat-reflecting layer is located between the 316L stainless steel outer layer and the polyurethane foam inner layer.

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