Anti-overcompensation gas density monitoring equipment

Abstract

The present invention provides an over-compensation-proof gas density monitoring device, comprising a double-layer shell assembly, a transparent observation window assembly and a movement transmission assembly, wherein a first sealed interlayer is formed between an inner shell and an outer shell in the double-layer shell assembly, and a second sealed interlayer is formed between the double-layer transparent window and a cover in the transparent observation window assembly, the first sealed interlayer and the second sealed interlayer are equivalent to a heat-insulating layer, which limits the natural convection of internal and external air, reduces the speed at which external heat is transferred to the inner shell, helps to maintain the relative stability of the internal temperature of the gas density monitoring device, prevents over-compensation of a temperature compensation element due to rapid changes in external temperature, and avoids erroneous triggering of low-pressure alarms and lockout signals.

Description

Technical Field

[0001] The invention relates to the technical field of electrical equipment, and in particular to an over-compensation-proof gas density monitoring device. Background Art

[0002] In the power system, SF6 (sulfur hexafluoride) is an important insulating and arc-extinguishing medium and is widely used in high-voltage electrical equipment. In order to ensure the normal operation of these equipment and prevent performance degradation or safety accidents caused by gas leakage, SF6 density monitoring equipment plays a vital role. These devices monitor the pressure changes of SF6 gas inside the power equipment, indirectly reflecting the changes in gas density, thereby effectively monitoring gas leakage.

[0003] However, in practical applications, SF6 density monitoring equipment faces many challenges, among which the impact of ambient temperature changes on monitoring results is particularly significant. Due to the fluctuation of ambient temperature, the pressure value measured by the monitoring equipment will change accordingly. This change is not entirely caused by the actual density change of SF6 gas, but by the pressure effect caused by temperature change. Therefore, judging the density change of SF6 gas based on pressure value alone is often not accurate enough.

[0004] To solve this problem, the industry generally uses SF6 density monitoring equipment with temperature compensation function. This type of equipment can sense the change of ambient temperature in real time and correct the pressure value accordingly, so as to more accurately reflect the actual density of SF6 gas. When the pressure drops to the preset threshold, the equipment will issue a low pressure alarm or lock signal to remind the operator to take timely measures.

[0005] Nevertheless, SF6 density monitoring equipment with temperature compensation may still have problems in certain specific environments. Especially in areas with high altitudes, high latitudes or strong direct sunlight, due to the large temperature difference between morning and evening, there is often a large difference between the internal temperature of the monitoring equipment and the actual temperature of the SF6 gas chamber of the power equipment. Especially after noon in summer, when the direct sunlight is strong, the internal temperature of the monitoring equipment rises rapidly, while the actual temperature of the gas chamber fails to rise synchronously due to various factors (such as thermal inertia, shading conditions, etc.), resulting in the internal temperature of the monitoring equipment being higher than the actual temperature of the gas chamber.

[0006] This temperature difference will cause the density monitoring equipment to overcompensate, that is, the equipment will misjudge the density of SF6 gas to decrease, thus triggering a low pressure alarm. This situation often occurs in the actual operation of Liupanshui 110kV Yushe Substation, 220kV Hongguo Substation and Guiyang, bringing potential risks to the stable operation of the power system. Summary of the invention

[0007] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a gas density monitoring device that prevents over-compensation, which is used to solve the defects of the monitoring device being over-compensated and causing false alarms due to the difference between the internal temperature of the existing density monitoring device and the gas chamber temperature.

[0008] To achieve the above-mentioned purpose, the present invention provides an anti-overcompensation gas density monitoring device for installation on external electrical equipment, comprising: a double-layer shell assembly, comprising an outer shell and an inner shell arranged inside the outer shell, a first sealed interlayer is formed between the inner shell and the outer shell; a transparent observation window assembly, comprising a double-layer transparent window and a cover, the cover is sealed and connected to the outer shell; the double-layer transparent window is arranged between the cover and the outer shell, and a second sealed interlayer is formed between the cover and the outer shell; a movement transmission assembly, the movement transmission assembly includes a temperature compensation element, and the temperature compensation element is arranged in the inner shell.

[0009] As a preferred embodiment, it further comprises a pressure-sensitive component, one end of which is rotatably connected to one end of the temperature compensation element.

[0010] As a preferred embodiment, it further comprises a base, one end of which is connected to the other end of the pressure-sensing component, and the pressure-sensing component is arranged in the inner shell.

[0011] As a preferred embodiment, a first fixing hole is provided on the outer shell, and a second fixing hole is provided on the inner shell; one end of the base passes through the first fixing hole, the second fixing hole and is connected to the other end of the pressure-sensing component; the base and the outer shell are sealed and fixed along the gap between the first fixing hole and the base to reduce convection of internal and external air; a thermal resistance gap is provided between the second fixing hole and the base to reduce the speed at which heat generated by the base due to changes in external ambient temperature is transferred to the inner shell.

[0012] As a preferred embodiment, one or more sealing rings are arranged between the double-layer transparent window and the cover.

[0013] As a preferred embodiment, a valve body and a mounting seat are provided on the outer shell, the valve body is fixed to the outer shell via the mounting seat, and the first sealed interlayer is evacuated or filled with inert gas via the valve body.

[0014] As a preferred embodiment, the outer surfaces of the inner shell and the outer shell are both provided with a first heat reflective film.

[0015] As a preferred embodiment, a second heat reflective film is provided on the outer surface of the double-layer transparent window.

[0016] As a preferred embodiment, the other end of the base is connected to the air chamber of the external electrical equipment, and a gas channel is formed inside the base, which extends to the other end of the base so that the gas channel is connected to the air chamber of the external electrical equipment; the gas channel is connected to the other end of the pressure sensing component.

[0017] As a preferred embodiment, the movement transmission assembly also includes a movement driving member, a pointer rotatably connected to the movement driving member, and a dial arranged between the movement driving member and the pointer; the movement driving member is rotatably connected to the other end of the temperature compensation element; when the gas density in the air chamber of the external electrical equipment changes, one end of the pressure sensing assembly is displaced, and the movement driving member is driven to rotate through the temperature compensation element, thereby driving the pointer to rotate on the dial to display the measured value.

[0018] As described above, the anti-overcompensation gas density monitoring device involved in the present invention has the following beneficial effects: a first sealed interlayer is formed between the inner shell and the outer shell in the double-layer shell assembly, and a second sealed interlayer is formed between the double-layer transparent window and the cover in the transparent observation window assembly. The first sealed interlayer and the second sealed interlayer are equivalent to thermal insulation layers, which limit the natural convection of air inside and outside the gas density monitoring device, reduce the heat exchange caused by air flow, and can block the direct transfer of external heat, reduce the speed of external heat transfer to the inner shell, help maintain the relative stability of the internal temperature of the gas density monitoring device, prevent the temperature compensation element from overcompensating due to rapid changes in external temperature, avoid the occurrence of erroneous triggering of low pressure alarms and lockout signals, and ensure the stability and monitoring accuracy of the gas density monitoring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is an exploded view of the anti-overcompensation gas density monitoring device of the present invention.

[0020] Figure 2 Shown is a schematic diagram of the assembly of the anti-overcompensation gas density monitoring device of the present invention.

[0021] Figure 3 Shown is a schematic diagram of the assembly of the double-layer shell component of the present invention.

[0022] Figure 4 Shown is a schematic diagram of the assembly of the transparent observation window assembly of the present invention.

[0023] Figure 5 Shown is a schematic diagram of the overall structure of the anti-overcompensation gas density monitoring device in the present invention.

[0024] Figure 6Shown is a schematic diagram of the internal heat source of the anti-overcompensation gas density monitoring device in the present invention.

[0025] Figure 7 Shown is a schematic diagram of the internal heat source of density monitoring equipment in the prior art.

[0026] Component number description

[0027] 1 Double shell assembly

[0028] 11. Outer shell

[0029] 111 Valve body

[0030] 112 Mounting Seat

[0031] 12 Inner shell

[0032] 13. First closed interlayer

[0033] 2 Transparent viewing window assembly

[0034] 21 Double-layer transparent window

[0035] 22. Watch cover

[0036] 23 Second sealing interlayer

[0037] 24 Sealing ring

[0038] 3 Movement transmission components

[0039] 31 Movement drive parts

[0040] 32 Pointers

[0041] 33 Dial

[0042] 4 Pressure Sensing Components

[0043] 5. Base DETAILED DESCRIPTION

[0044] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0045] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification, so that people familiar with this technology can understand and read them, and are not used to limit the limiting conditions that the present invention can implement, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present invention. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present application is limited only by the claims of the published patents. The terms used here are only for describing specific embodiments and are not intended to limit the present application. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., can be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "hold" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions or operations is inherently mutually exclusive in some way.

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution in the embodiments of the present invention is further described in detail through the following embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the invention.

[0049] like Figure 1-6As shown, the present invention provides an anti-overcompensation gas density monitoring device for installation on external electrical equipment, comprising:

[0050] A double-layer shell assembly 1 comprises an outer shell 11 and an inner shell 12 arranged inside the outer shell 11, wherein a first sealed interlayer 13 is formed between the inner shell 12 and the outer shell 11;

[0051] The transparent observation window assembly 2 comprises a double-layer transparent window 21 and a cover 22, wherein the cover 22 is sealed and connected to the outer shell 11; the double-layer transparent window 21 is arranged between the cover 22 and the outer shell 11, and forms a second sealing interlayer 23 with the cover 22;

[0052] The movement transmission assembly 3 includes a temperature compensation element, and the temperature compensation element is arranged in the inner shell 12.

[0053] The anti-overcompensation gas density monitoring device of the present invention has a first sealed interlayer 13 formed between the inner shell 12 and the outer shell 11 in the double-layer shell assembly 1, and a second sealed interlayer 23 is formed between the double-layer transparent window 21 and the cover 22 in the transparent observation window assembly 2. The first sealed interlayer 13 and the second sealed interlayer 23 are equivalent to thermal insulation layers, which limit the natural convection of air inside and outside the gas density monitoring device, reduce the heat exchange caused by air flow, and can block the direct transfer of external heat, reduce the speed of external heat transfer to the inner shell 12, help maintain the relative stability of the internal temperature of the gas density monitoring device, prevent the temperature compensation element from overcompensating due to rapid changes in external temperature, avoid the erroneous triggering of low pressure alarms and lockout signals, and ensure the stability and monitoring accuracy of the gas density monitoring device.

[0054] It is worth noting that the first sealed interlayer 13 and the second sealed interlayer 23 can be regarded as air barriers. Under standard atmospheric pressure and 20°C, the thermal conductivity of air is very low, about 0.024 W / (m·K). Therefore, the first sealed interlayer 13 and the second sealed interlayer 23 can effectively reduce the speed of heat transfer to the inside of the gas density monitoring equipment, help maintain the relative stability of the internal temperature of the gas density monitoring equipment, and effectively reduce the occurrence of false alarms caused by over-compensation of the gas density monitoring equipment due to sudden changes in the external environment.

[0055] In this embodiment, if Figure 2 , 4As shown, the outer layer and the inner layer of the double-layer transparent window 21 are both made of transparent materials with high light transmittance, such as glass or polycarbonate (PC). These materials not only have good light transmittance, but also have certain strength and durability, and can withstand various influences of the external environment. There is an interlayer material filled between the two layers of transparent materials, and the common ones are air, vacuum or special gases (such as argon, krypton, etc.). These interlayer materials play a key role in heat insulation in the double-layer transparent window 21, and can effectively reduce the direct heating of the internal part of the device by external heat sources such as solar radiation, thereby reducing the speed at which external heat is transferred to the inner shell 12.

[0056] In this embodiment, if Figure 1-3 As shown, it also includes a pressure sensing component 4, one end of which is rotatably connected to one end of the temperature compensation element. When the gas density in the gas chamber of the external electrical equipment changes, the pressure sensing component 4 can be deformed and displaced, and drive the pointer 32 on the movement transmission component 3 to rotate on the dial 33 to display the gas density measurement value. The pressure sensing component 4 includes a spring tube or a Bourdon tube.

[0057] In this embodiment, if Figure 1-3 As shown, the inner housing 12 further includes a base 5, one end of which is connected to the other end of the pressure sensing component 4, and the pressure sensing component 4 is disposed in the inner housing 12. The other end of the base 5 is connected to the air chamber of the external electrical device, and a gas channel is formed inside the base 5, the gas channel extends to the other end of the base 5, so that the gas channel is connected to the air chamber of the external electrical device; the gas channel is connected to the other end of the pressure sensing component 4.

[0058] In this embodiment, if Figure 1 As shown, the movement transmission assembly 3 also includes a movement driving member 31, a pointer 32 rotatably connected to the movement driving member 31, and a dial 33 arranged between the movement driving member 31 and the pointer 32; the movement driving member 31 is rotatably connected to the other end of the temperature compensation element; when the gas density in the air chamber of the external electrical equipment changes, one end of the pressure sensing assembly 4 is displaced, and the movement driving member 31 is driven to rotate through the temperature compensation element, and then the pointer 32 is driven to rotate on the dial 33 to display the measured value, thereby realizing gas density monitoring.

[0059] In this embodiment, the temperature compensation element is usually a double-layer or multi-layer structure made of metals or alloys with different thermal expansion coefficients. When the ambient temperature changes, these metals or alloys will produce different thermal deformations due to the difference in thermal expansion coefficients. This thermal deformation can be used to compensate for the pressure displacement generated by the pressure-sensitive component 4 (such as a spring tube), thereby ensuring that the density value measured at different temperatures is accurate. When the external ambient temperature changes, the temperature compensation element will produce a displacement related to the temperature change due to thermal deformation, and this displacement will act on the pressure-sensitive component 4, thereby offsetting the pressure displacement of the pressure-sensitive component 4 caused by the temperature change. In this way, even if the external ambient temperature changes, the pressure displacement generated by the pressure-sensitive component 4 will be offset by the temperature compensation element, thereby ensuring that the measured density value is accurate. However, in some high-altitude, high-latitude or strong sunshine areas, the temperature difference between morning and evening is large, resulting in a significant difference between the internal temperature of the monitoring equipment and the actual temperature of the air chamber. In the afternoon of summer, the temperature difference intensifies, and the temperature inside the monitoring equipment is higher than the actual temperature of the gas chamber. At this time, the temperature compensation component produces erroneous compensation due to overreaction (overcompensation), causing the monitoring equipment to misjudge the gas density decrease, thereby triggering a low pressure alarm, which has an adverse effect on the normal operation of the equipment and the accuracy of the monitoring data. Therefore, the anti-overcompensation gas density monitoring device of the present application effectively reduces the speed of heat transfer to the inside of the gas density monitoring device by setting a double-layer shell component 1 and a transparent observation window component 2, as well as the first sealed interlayer 13 and the second sealed interlayer 23 formed therein, which helps to maintain the relative stability of the internal temperature of the gas density monitoring device, and effectively reduces the occurrence of false alarms caused by overcompensation of the gas density monitoring device due to sudden changes in the external environment.

[0060] In this embodiment, if Figure 3 As shown, a first fixing hole is provided on the outer shell 11, and a second fixing hole is provided on the inner shell 12. One end of the base 5 passes through the first fixing hole, the second fixing hole and is connected to the other end of the pressure-sensing component 4; the base 5 and the outer shell 11 are sealed and fixed along the gap between the first fixing hole and the base 5 to reduce the convection of the internal and external air; a thermal resistance gap is provided between the second fixing hole and the base 5 to reduce the speed at which the heat generated by the base 5 due to the change of the external ambient temperature is transferred to the inner shell 12.

[0061] In this embodiment, if Figure 3As shown, the base 5 and the outer shell 11 are welded along the gap between the first fixing hole and the base 5 to achieve a sealed fixation of the base 5 and the outer shell 11, which can effectively prevent air convection between the inside and the outside of the gas density monitoring device. In addition, a thermal resistance gap is set between the second fixing hole and the base 5, so that a certain gap is left between the inner shell 12 and the base 5 to act as a thermal resistance layer, which reduces the speed at which the heat on the base 5 is transferred to the inner shell 12, and slows down the heat transfer process.

[0062] In this embodiment, if Figure 2 , 4 As shown, one or more sealing rings 24 are arranged between the double-layer transparent window 21 and the cover 22. The cover 22 is connected to the outer shell 11 by welding or sealing glue, which not only improves the sealing performance between the cover 22 and the outer shell 11, but also reduces the speed of external heat transfer to the inside, especially in high temperature or strong sunlight environment, which can significantly reduce the impact of heat on the internal environment of the device. One or more sealing rings 24 are arranged between the double-layer transparent window 21 and the cover 22, which can ensure the tight connection between the double-layer transparent window 21 and the cover 22. Through its elasticity and resilience, the sealing ring 24 can effectively fill the small gap between the two, thereby preventing external impurities such as moisture, dust, and air from invading the inside of the device. The sealing ring 24 can also reduce the speed of external heat transfer to the inside of the device to a certain extent. Since the sealing ring 24 is usually made of materials with certain heat insulation properties, such as polypropylene (PP), polytetrafluoroethylene (PTFE), fluororubber (FKM) and polyurethane (PU), these materials can effectively block the heat transfer path, thereby reducing the increase in the internal temperature of the device. Especially in harsh environmental conditions, such as high temperature, humidity or strong sunlight, it effectively reduces the speed at which heat is transferred into the device, helping to maintain the stability of the internal temperature of the device.

[0063] In this embodiment, if Figure 1-3 As shown in Figure 5, the outer shell 11 is provided with a valve body 111 and a mounting seat 112, and the valve body 111 is fixed to the outer shell 11 through the mounting seat 112. The first closed interlayer 13 is evacuated or filled with inert gas through the valve body 111 to further reduce the speed of external heat transfer to the inner shell 12, which helps to maintain the relative stability of the internal temperature of the gas density monitoring equipment.

[0064] In this embodiment, if Figure 2 , 3As shown, by evacuating the first sealed interlayer 13, the number of air molecules in the first sealed interlayer 13 can be greatly reduced, thereby reducing the efficiency of heat conduction. Because air is one of the main media for heat conduction, reducing its presence can effectively slow down the speed at which external heat enters the inner shell 12 through conduction. Inert gases (such as argon, nitrogen, etc.) are filled in the first sealed interlayer 13. These inert gases have low thermal conductivity and can effectively block the transfer of external heat. At the same time, the chemical properties of inert gases are stable and will not react with other materials inside the device, thereby ensuring the long-term stable operation of the device.

[0065] In this embodiment, the outer surfaces of the inner shell 12 and the outer shell 11 are both provided with a first heat reflective film to further reduce the speed at which external heat is transferred to the interior of the gas density monitoring device. The first heat reflective film has a high reflectivity characteristic and can efficiently reflect most of the incident solar radiation heat or environmental heat. When external heat attempts to be transferred to the inner shell 12 or the outer shell 11 by thermal radiation, the first heat reflective film will reflect most of it back, thereby reducing the actual amount of heat absorbed.

[0066] In this embodiment, a second heat reflective film is disposed on the outer surface of the double-layer transparent window 21. The principle of the second heat reflective film in reducing the external heat transfer rate is similar to that of the first heat reflective film, and will not be described in detail here.

[0067] In this embodiment, the purpose of reducing the external heat transfer rate can also be achieved by applying a coating or plating to the inner shell 12, the outer shell 11, and the cover 22.

[0068] In this embodiment, the three modes of heat transfer include: heat conduction, heat convection, and heat radiation. Figure 7 As shown in the figure, the internal heat sources of existing SF6 density monitoring equipment mainly include three parts: (1) The external environment is transferred to the shell through conduction, convection, and radiation, and then radiated and conducted to the internal air. (2) The external environment is transferred to the transparent window through conduction, convection, and radiation, and then radiated and conducted to the internal air. (3) Sunlight directly radiates to the interior.

[0069] However, in the prior art, since the SF6 gas chamber is a relatively large enclosed space, it is filled with SF6 gas and has a certain heat capacity. This means that when the temperature changes, the gas chamber needs to absorb or release more heat to reach a new thermal equilibrium state, so the internal temperature rises relatively slowly. In contrast, the monitoring equipment has a relatively compact internal component and structure, has a small heat capacity and is directly exposed to the external environment. When the external temperature changes, the temperature of the monitoring equipment changes faster. Therefore, in some areas with high altitudes, high latitudes or strong direct sunlight, due to the large temperature difference between morning and evening, there is often a large difference between the internal temperature of the monitoring equipment and the actual temperature of the SF6 gas chamber of the power equipment. Especially after noon in summer, the direct sunlight is strong, the internal temperature of the monitoring equipment rises rapidly, and the actual temperature of the gas chamber fails to rise synchronously, resulting in the internal temperature of the monitoring equipment being higher than the actual temperature of the gas chamber. This temperature difference will cause the density monitoring equipment to produce over-compensation, that is, the equipment misjudges that the density of SF6 gas has decreased, thereby triggering a low pressure alarm, affecting the normal operation of the equipment and the accuracy of the monitoring results.

[0070] The anti-overcompensation gas density monitoring device of the present invention is as follows: Figure 6 As shown, its internal heat source is basically consistent with the existing SF6 density monitoring equipment, but the anti-overcompensation gas density monitoring equipment of the present invention is provided with a double-layer shell assembly 1 and a transparent observation window assembly 2, and the closed interlayer formed therebetween, that is, a first closed interlayer 13 is formed between the inner shell 12 and the outer shell 11 in the double-layer shell assembly 1, and a second sealed interlayer 23 is formed between the double-layer transparent window 21 and the cover 22 in the transparent observation window assembly 2, thereby forming an air barrier, which can effectively reduce the speed of heat transfer to the interior of the gas density monitoring equipment, help maintain the relative stability of the internal temperature of the gas density monitoring equipment, and effectively reduce the occurrence of false alarms caused by overcompensation of the gas density monitoring equipment due to sudden changes in the external environment.

[0071] Furthermore, the first sealed interlayer 13 can be evacuated or filled with inert gas, and the heat transfer coefficient between the outer shell 11 and the inner shell 12 will be lower, almost 0. Furthermore, a heat reflective film is attached to the outer surface of the outer shell 11, the inner shell 12, and the double-layer transparent window 21. The heat reflective film has high reflection of infrared and ultraviolet rays in sunlight, further reducing the speed of heat transfer to the inside of the gas density monitoring device, and avoiding the occurrence of false alarm caused by over-compensation of the gas density monitoring device due to sudden changes in the external environment.

[0072] Furthermore, the anti-overcompensation gas density monitoring device of the present invention solves the problem of low-pressure alarm and lock signal erroneous triggering caused by overcompensation of the monitoring device due to sudden temperature difference in actual use by setting a double-layer shell component 1 and a transparent observation window component 2, as well as the closed interlayer formed by them. The structure and process are simple, and while improving its own reliability, stability and accuracy, it reduces dependence on the environment and protective covers. In addition, the double-layer structure also helps to improve the IP protection level and reduce the impact of rainwater when it is installed exposed; finally, by vacuuming, filling with inert gas, or cooperating with coating, plating, heat reflective film and other processes, it can better adapt to different application environments.

[0073] In summary, in the anti-overcompensation gas density monitoring device of the present invention, a first sealed interlayer 13 is formed between the inner shell 12 and the outer shell 11 in the double-layer shell assembly 1, and a second sealed interlayer 23 is formed between the double-layer transparent window 21 and the cover 22 in the transparent observation window assembly 2. The first sealed interlayer 13 and the second sealed interlayer 23 are equivalent to a heat insulation layer, which limits the natural convection of air inside and outside the gas density monitoring device, reduces the heat exchange caused by air flow, and can block the direct transfer of external heat, reducing the speed of external heat transfer to the inner shell 12, which helps to maintain the relative stability of the internal temperature of the gas density monitoring device, prevents the temperature compensation element from making overcompensation due to rapid changes in the external temperature, avoids the occurrence of erroneous triggering of low-pressure alarms and lockout signals, and ensures the stability and monitoring accuracy of the gas density monitoring device. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0074] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An anti-overcompensation gas density monitoring device for installation on external electrical equipment, characterized in that: include: A double-layer shell assembly (1) comprises an outer shell (11) and an inner shell (12) arranged inside the outer shell (11), wherein a first sealed interlayer (13) is formed between the inner shell (12) and the outer shell (11); A transparent observation window assembly (2), comprising a double-layer transparent window (21) and a cover (22), wherein the cover (22) is sealed and connected to the outer shell (11); the double-layer transparent window (21) is arranged between the cover (22) and the outer shell (11), and forms a second sealing interlayer (23) between the double-layer transparent window (21) and the cover (22); A movement transmission assembly (3), the movement transmission assembly (3) comprising a temperature compensation element, the temperature compensation element being arranged in the inner housing (12); A pressure-sensing component (4), one end of the pressure-sensing component (4) being rotatably connected to one end of the temperature compensation element; A base (5), one end of the base (5) being connected to the other end of the pressure-sensing component (4), and the pressure-sensing component (4) being arranged in the inner shell (12); The outer shell (11) is provided with a first fixing hole, and the inner shell (12) is provided with a second fixing hole; one end of the base (5) passes through the first fixing hole, the second fixing hole and is connected to the other end of the pressure sensing component (4); the base (5) and the outer shell (11) are sealed and fixed along the gap between the first fixing hole and the base (5) to reduce convection of internal and external air; a thermal resistance gap is provided between the second fixing hole and the base (5) to reduce the speed at which heat generated by the base (5) due to changes in external ambient temperature is transferred to the inner shell (12).

2. The over-compensation gas density monitoring device according to claim 1, characterized in that: One or more sealing rings (24) are arranged between the double-layer transparent window (21) and the surface cover (22).

3. The over-compensation gas density monitoring device according to claim 1, characterized in that: The outer shell (11) is provided with a valve body (111) and a mounting seat (112); the valve body (111) is fixed to the outer shell (11) via the mounting seat (112); and the first sealed interlayer (13) is evacuated or filled with an inert gas via the valve body (111).

4. The over-compensation gas density monitoring device according to claim 1, characterized in that: The outer surfaces of the inner shell (12) and the outer shell (11) are both provided with a first heat reflection film.

5. The over-compensation gas density monitoring device according to claim 1, characterized in that: The outer surface of the double-layer transparent window (21) is provided with a second heat reflection film.

6. The over-compensation gas density monitoring device according to claim 1, characterized in that: The other end of the base (5) is connected to the air chamber of the external electrical device, and a gas channel is formed inside the base (5), and the gas channel extends to the other end of the base (5) so that the gas channel is connected to the air chamber of the external electrical device; the gas channel is connected to the other end of the pressure sensing component (4).

7. The over-compensation gas density monitoring device according to claim 1, characterized in that: The movement transmission assembly (3) further comprises a movement driving member (31), a pointer (32) rotatably connected to the movement driving member (31), and a dial (33) arranged between the movement driving member (31) and the pointer (32); the movement driving member (31) is rotatably connected to the other end of the temperature compensation element; when the gas density in the air chamber of the external electrical equipment changes, one end of the pressure sensing assembly (4) is displaced, and the movement driving member (31) is driven to rotate through the temperature compensation element, thereby driving the pointer (32) to rotate on the dial (33) to display the measured value.

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