A precision instrument cooling device and system

Abstract

The present application relates to the technical field of power plant field instrument cooling, and specifically discloses a precision instrument cooling device and system. The present application sets up a heat preservation box with a containing cavity in the inside and an air inlet on the side wall to accommodate the precision instrument, and the cold air outlet of the air cooling gun is communicated with the air inlet of the heat preservation box to form a directional cold air conveying path. At the same time, a pressure reducing valve is connected in the air flow pipeline between the compressed air source and the air inlet end of the air cooling gun to adjust the flow rate of the compressed air. The present application solves the problem that the cooling capacity of the existing compressed air purging device greatly decreases in the high temperature environment in summer due to the increase of the temperature of the compressed air with the ambient temperature, and it is difficult to ensure the stable operation of the precision instrument under high temperature working conditions. The present application improves the temperature control precision of the precision instrument operating environment and the reliability of the cooling process.

Description

Technical Field

[0001] This invention relates to the field of instrument cooling technology in thermal power plants, and particularly to a precision instrument cooling device and system. Background Technology

[0002] In industrial settings such as thermal power plants, boilers release a large amount of heat during operation, with furnace temperatures reaching thousands of degrees Celsius. Even adjacent operating areas often experience temperatures above 50 or 60 degrees Celsius. In the high temperatures of summer, the continuous operation of various equipment within power plants generates heat, further increasing the perceived temperature of the working environment. This not only increases the risk of heatstroke and other occupational health problems for workers but also poses a serious threat to the normal operation of precision instruments. To address this issue, existing technologies typically employ the installation of compressed air purging devices at the precision instruments to enhance local airflow and achieve cooling. However, this approach has significant limitations. When ambient temperatures remain consistently high in summer, the temperature of the compressed air itself also rises, significantly reducing its cooling capacity and failing to meet the stringent requirements of precision instruments for stable operation under high-temperature conditions.

[0003] Therefore, there is an urgent need to provide a technical solution to address the above problems. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention provides a precision instrument cooling device and system.

[0005] In a first aspect, the present invention provides a precision instrument cooling device, the technical solution of which is as follows: The insulated box has an internal cavity, and an air inlet communicating with the cavity is provided on the side wall of the insulated box. The cavity accommodates precision instruments. The air cooling gun has a cold air outlet, which is connected to the air inlet; The pressure reducing valve is connected to the airflow pipeline between the compressed air source and the air inlet of the air cooler. The pressure reducing valve is used to regulate the flow rate of the compressed air flowing to the air cooler through the pressure reducing valve.

[0006] The advantages of the precision instrument cooling device of the present invention are as follows: The device of this invention uses an insulated box with an internal cavity and an air inlet on the side wall to accommodate precision instruments. The cold air outlet of the air cooling gun is connected to the air inlet of the insulated box to form a directional cold air delivery path. At the same time, a pressure reducing valve is connected in the airflow pipeline between the compressed air source and the air inlet of the air cooling gun to regulate the compressed air flow rate. This solves the problem that existing compressed air purging devices suffer from a significant decrease in cooling capacity due to the increase in compressed air temperature with the rise in ambient temperature in summer, making it difficult to ensure the stable operation of precision instruments under high-temperature conditions. This improves the accuracy of temperature control of the operating environment of precision instruments and the reliability of the cooling process.

[0007] Based on the above solution, the precision instrument cooling device of the present invention can be further improved as follows.

[0008] In one alternative embodiment, a high-temperature resistant elastic sealing strip is embedded at the seam of the insulated box.

[0009] The advantages of adopting the above-mentioned optional method are: further embedding high-temperature resistant elastic sealing strips at the joints of the box body enhances the overall airtightness of the insulation box, reduces the leakage of cold air from the gaps, and prevents external high-temperature air from seeping into the containment cavity, thus maintaining the stability and durability of the internal low-temperature environment.

[0010] In one alternative embodiment, the wall of the insulated box is composed of an inner heat-resistant alloy liner, an outer weather-resistant steel liner, and an aerogel insulation interlayer filled between the inner heat-resistant alloy liner and the outer weather-resistant steel liner.

[0011] The advantages of adopting the above-mentioned optional method are as follows: by further adopting a composite box wall structure with an inner heat-resistant alloy liner and an outer weather-resistant steel liner sandwiching an aerogel insulation layer, the ultra-low thermal conductivity of aerogel is used to block the transfer of external high temperature to the cavity, thereby improving the overall heat insulation capacity of the insulation box and creating a more stable low-temperature operating space for precision instruments.

[0012] In one alternative embodiment, a pressure-resistant observation window is embedded in the front wall of the insulated box. The pressure-resistant observation window is composed of double-layered borosilicate glass plates, and the gap between the double-layered borosilicate glass plates is evacuated to a vacuum state.

[0013] The advantages of adopting the above-mentioned optional method are as follows: a pressure-resistant observation window composed of double-layer vacuum borosilicate glass plates is further embedded in the front box wall, which facilitates direct observation of the operating status of precision instruments, while using the vacuum layer to block the heat transfer path, thus taking into account both the visibility function and the heat insulation and protection performance.

[0014] In one alternative embodiment, an oil-water separator filter is connected in series on the airflow pipeline between the compressed air source and the pressure reducing valve. The input end of the oil-water separator filter is connected to the compressed air source, and the output end of the oil-water separator filter is connected to the input end of the pressure reducing valve.

[0015] The advantages of adopting the above optional method are as follows: by further connecting an oil-water separator filter in series on the airflow pipeline between the compressed air source and the pressure reducing valve, oil and moisture impurities in the compressed air are removed in advance, so as to avoid contaminants entering the air cooling gun and affecting the quality of the cooling air, and to ensure the cleanliness of the cooling airflow and the long-term operational reliability of the equipment.

[0016] In one alternative embodiment, the air cooling gun is a vortex tube type air cooling gun, which has a spiral vortex generating channel inside and a hot end exhaust port at the end of the vortex tube type air cooling gun away from the cold air outlet.

[0017] The advantages of adopting the above-mentioned optional method are as follows: by further adopting a vortex tube type air cooler with a built-in spiral vortex generating channel, the hot and cold air streams are separated by the high-speed rotation of compressed air in the vortex tube, which can continuously generate low-temperature cold air without additional refrigerant, simplifying the system structure and improving the cooling response speed.

[0018] In one alternative embodiment, an impedance composite silencer is fitted around the outside of the hot-end exhaust port, and the housing of the impedance composite silencer is filled with sound-absorbing fiber material.

[0019] The beneficial effects of adopting the above-mentioned optional method are as follows: by further installing an impedance composite silencer filled with sound-absorbing fiber material on the outside of the hot end exhaust port, the exhaust noise energy is absorbed and reflected by the resistive and reactive composite silencer structure, thereby reducing the operating noise level of the device and improving the on-site working environment.

[0020] In one alternative embodiment, the pressure reducing valve is a manual knob-type pressure reducing valve with a graduated ring marked with multiple flow rate settings.

[0021] The advantages of adopting the above-mentioned optional method are: further designing the pressure reducing valve as a manual knob structure with a scale marking ring, and realizing precise adjustment and intuitive quantitative control of the compressed air flow rate through multiple flow rate levels, making it easy for operators to quickly set and lock the appropriate flow rate according to actual cooling needs.

[0022] In one alternative embodiment, the air inlet of the insulated box is located in the lower region of the side wall of the insulated box, and a lifting ring assembly is fixedly connected to the top outer wall of the insulated box.

[0023] The advantages of adopting the above-mentioned optional method are as follows: the air inlet is further opened in the lower part of the side wall of the heat preservation box, so that the cold air enters from the bottom of the cavity and naturally diffuses upward to fill the entire cavity, forming a uniform and stable temperature distribution. The lifting ring assembly fixedly connected to the top outer wall facilitates the on-site hoisting and position adjustment of the device.

[0024] Secondly, the present invention provides a precision instrument cooling system, which includes the precision instrument cooling device as provided by the present invention.

[0025] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0026] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of an embodiment of a precision instrument cooling device according to the present invention. Detailed Implementation

[0027] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0028] Figure 1 A schematic diagram of an embodiment of a precision instrument cooling device provided by the present invention is shown. Figure 1 As shown, the precision instrument cooling device includes: an insulation box, an air cooling gun, and a pressure reducing valve.

[0029] The insulated box has an internal cavity, and an air inlet communicating with the cavity is provided on the side wall of the insulated box. The cavity accommodates precision instruments.

[0030] Among them, the heat preservation box refers to a box structure with a closed cavity inside, which is used to physically isolate precision instruments from the external high-temperature environment; for example, a rectangular metal box with external dimensions of 400mm×300mm×200mm is installed on the boiler platform of a thermal power plant. A circular through hole is opened on the side wall of the box at a height of 30mm from the bottom as an air inlet, and a pressure transmitter is placed in the cavity inside the box.

[0031] The term "receptacle" refers to the hollow space inside the insulation box used to house precision instruments. For example, the inner wall dimensions of the insulation box, after deducting the wall thickness, form a rectangular cavity of approximately 380mm × 280mm × 180mm. The pressure transmitter is fixed within a flexible metal clamp at the bottom of the cavity, which is the receptacle. The term "air inlet" refers to a through-hole structure on the side wall of the insulation box for allowing cold air to enter the receptacle. For example, a 10mm diameter hole is drilled on the right side wall of the insulation box at a height of 30mm from the bottom surface. A stainless steel pipe connector with an outer diameter of 10mm and a length of 20mm is welded into the hole; this stainless steel pipe connector is the air inlet.

[0032] Among them, precision instruments refer to instruments and equipment installed on the site of thermal power plants to measure process parameters such as temperature, pressure, flow rate or liquid level and which are sensitive to changes in the working environment temperature; for example, a C-type intelligent pressure transmitter used to monitor the main steam pressure of the boiler has a normal working environment temperature limit of 85°C. Direct exposure to the high temperature environment above 55°C on the boiler platform will cause the measured value to drift and the electronic components to age faster.

[0033] The air cooling gun has a cold air outlet, which is connected to the air inlet.

[0034] An air cooling gun refers to a device that uses compressed air to generate a low-temperature airflow. After entering the air cooling gun, the compressed air is separated into a cold airflow and a hot airflow through an internal vortex structure, with the cold airflow exiting from the cold air outlet. For example, the compressed air inlet of a type A vortex tube air cooling gun is connected to a factory compressed air pipeline. The cold air outlet of the cooling gun is connected to the air inlet of the insulation box via a stainless steel compression fitting, and the hot end exhaust port faces outwards towards the atmosphere. The cold air outlet refers to the opening or interface on the air cooling gun used to output the low-temperature airflow. For example, the front end of a type A vortex tube air cooling gun has an internally threaded interface, with a copper pagoda connector screwed onto the interface. The pagoda connector has an outer diameter of 8mm, and the cold air outlet is connected to the air inlet of the insulation box via a low-temperature resistant flexible hose with an inner diameter of 8mm.

[0035] The pressure reducing valve is connected to the airflow pipeline between the compressed air source and the air inlet of the air cooler. The pressure reducing valve is used to regulate the flow rate of the compressed air flowing to the air cooler through the pressure reducing valve.

[0036] Among them, the pressure reducing valve refers to a control valve that is connected in series in the compressed air pipeline to regulate the pressure or flow rate of the downstream airflow; for example, a type B manual knob pressure reducing valve is installed on the airflow pipeline near the insulation box. The valve body has a scale marking ring on the top. The operator rotates the knob to make the pointer point to the third flow rate level marked on the scale ring.

[0037] The compressed air source refers to the air supply port that provides compressed air at a certain pressure to the airflow pipeline. For example, a branch pipe is drawn from the compressed air pipeline network of a thermal power plant, and an air intake with a ball valve is installed at the end of the branch pipe. The outlet pressure of the air intake is maintained in the range of 0.6MPa to 0.8MPa, and the air intake is the compressed air source. The air inlet refers to the interface part on the air cooler used to receive the input of compressed air. For example, the A-type vortex tube air cooler has an internally threaded air inlet connector on the side. The air inlet connector is connected to the airflow pipeline on the outlet side of the pressure reducing valve through an externally threaded quick plug, and the compressed air enters the vortex generation chamber inside the vortex tube through this connector. The airflow pipeline refers to the combination of pipes and fittings that connect the compressed air source, the oil-water separator filter, the pressure reducing valve, and the air inlet of the air cooler. For example, a 12mm outer diameter stainless steel pipe is led out from the factory compressed air intake, connected to the inlet of the oil-water separator filter via an elbow, the filter outlet is connected to the inlet of the pressure reducing valve via a stainless steel corrugated pipe, and the pressure reducing valve outlet is connected to the air inlet of the air cooler via a polyurethane hose. The above pipe sections and fittings together constitute the airflow pipeline.

[0038] The compressed air velocity refers to the volumetric flow rate or mass flow rate of compressed air passing through a certain cross section of the airflow pipeline per unit time. For example, when the pressure reducing valve knob is adjusted to the second position of the scale ring, the mass flow rate of compressed air passing through the pressure reducing valve is about 80L / min (standard state), and the cold air outlet temperature of the air cooler is about -20℃.

[0039] The technical solution of this embodiment uses an insulated box with an internal cavity and an air inlet on the side wall to accommodate precision instruments. The cold air outlet of the air cooling gun is connected to the air inlet of the insulated box to form a directional cold air delivery path. At the same time, a pressure reducing valve is connected in the airflow pipeline between the compressed air source and the air inlet of the air cooling gun to regulate the compressed air flow rate. This solves the problem that the existing compressed air purging device has a significantly reduced cooling capacity due to the increase in compressed air temperature with the ambient temperature in high-temperature summer environments, making it difficult to ensure the stable operation of precision instruments under high-temperature conditions. This improves the accuracy of temperature control of the operating environment of precision instruments and the reliability of the cooling process.

[0040] In one alternative embodiment, a high-temperature resistant elastic sealing strip is embedded at the seam of the insulated box.

[0041] The box body seam location refers to the joint area formed after the various wall panels of the insulation box are spliced ​​or bent and closed; for example, if the insulation box is made of stainless steel sheet bent and welded, the area along the inner weld line of the 90° angle formed by the butt joint of the top plate and the side plate is the box body seam location. The high-temperature resistant elastic sealing strip refers to a strip-shaped sealing element made of high-temperature resistant material with elastic deformation capability; for example, a silicone rubber foam sealing strip with a cross-sectional size of 6mm × 3mm is embedded at the joint between the top plate and the side plate of the insulation box, and the sealing strip is compressed to a thickness of approximately 2mm after the box body is assembled.

[0042] In the above-mentioned optional methods, a high-temperature resistant elastic sealing strip is further embedded at the seam of the box to enhance the overall airtightness of the insulated box, reduce the leakage of cold air from the gaps, and prevent the external high-temperature air from seeping into the containment cavity, thus maintaining the stability and durability of the internal low-temperature environment.

[0043] In one alternative embodiment, the wall of the insulated box is composed of an inner heat-resistant alloy liner, an outer weather-resistant steel liner, and an aerogel insulation interlayer filled between the inner heat-resistant alloy liner and the outer weather-resistant steel liner.

[0044] The inner heat-resistant alloy lining refers to a metal sheet made of high-temperature alloy steel that forms the inner wall of the insulated box. For example, the inner wall of the insulated box uses a 1.5mm thick 304 stainless steel sheet as the inner heat-resistant alloy lining, and the surface of the lining is brushed. The outer weathering steel lining refers to a metal sheet made of atmospheric corrosion-resistant steel that forms the outer wall of the insulated box. For example, the outer wall of the insulated box uses a 2.0mm thick D-type weathering steel sheet as the outer weathering steel lining, and the outer surface is sprayed with high-temperature resistant silver paint.

[0045] Among them, the aerogel insulation interlayer refers to an insulation layer made of silica aerogel material that is filled between the inner and outer lining plates of the insulation box; for example, a 20mm thick silica aerogel felt is filled between the inner 304 stainless steel plate and the outer weathering steel plate. The thermal conductivity of the aerogel felt is 0.018W / (m·K). After filling, a continuous insulation interlayer is formed between the inner and outer layers.

[0046] Among the above-mentioned optional methods, a composite box wall structure with an inner heat-resistant alloy liner and an outer weather-resistant steel liner sandwiching an aerogel insulation layer is further adopted. The ultra-low thermal conductivity of aerogel is used to block the transfer of external high temperature to the cavity, improve the overall heat insulation capacity of the insulation box, and create a more stable low-temperature operating space for precision instruments.

[0047] In one alternative embodiment, a pressure-resistant observation window is embedded in the front wall of the insulated box. The pressure-resistant observation window is composed of double-layered borosilicate glass plates, and the gap between the double-layered borosilicate glass plates is evacuated to a vacuum state.

[0048] The pressure-resistant observation window refers to a transparent window structure embedded in the front wall of the insulated box for observing the operating status of precision instruments inside, capable of withstanding the pressure difference between the inside and outside of the box. For example, a 120mm × 80mm rectangular opening is made in the center of the front wall of the insulated box, and an observation window assembly composed of double-layer borosilicate glass plates is installed at the opening. The frame of the observation window is fixed and sealed to the box wall with silicone sealant. The double-layer borosilicate glass plate refers to a transparent isolation component composed of two parallel stacked flat borosilicate glass plates. For example, the observation window uses two borosilicate glass plates, each 5mm thick, 130mm long, and 90mm wide, arranged parallel to each other with a 6mm gap between them.

[0049] The vacuum state refers to the low-pressure, rarefied gas state formed after the gas in the sealed gap between the double-layer borosilicate glass plates is removed. For example, when assembling the double-layer glass plates, butyl rubber spacers are placed in the gap, and the gas pressure in the gap is pumped to the level of 10⁻³Pa before sealing, thus forming an approximate vacuum state in the gap.

[0050] In the above-mentioned optional methods, a pressure-resistant observation window composed of double-layer vacuum borosilicate glass plates is further embedded in the front box wall. This facilitates direct observation of the operating status of precision instruments while using the vacuum layer to block the heat transfer path, thus combining visibility and heat insulation performance.

[0051] In one alternative embodiment, an oil-water separator filter is connected in series on the airflow pipeline between the compressed air source and the pressure reducing valve. The input end of the oil-water separator filter is connected to the compressed air source, and the output end of the oil-water separator filter is connected to the input end of the pressure reducing valve.

[0052] Among them, the oil-water separator filter refers to a filter device installed on the compressed air pipeline to separate and intercept liquid oil, water and solid particulate impurities in the compressed air; for example, an E-type oil-water separator filter is connected in series on the airflow pipeline upstream of the pressure reducing valve. The filter has a manual drain valve at the bottom and the filter element has a precision of 5μm. After the compressed air flows through the filter, the condensate is intercepted at the bottom of the filter cup.

[0053] In the above-mentioned optional methods, an oil-water separator filter is further connected in series in the airflow pipeline between the compressed air source and the pressure reducing valve to remove oil and moisture impurities in the compressed air in advance, so as to avoid contaminants entering the air cooler and affecting the quality of the cooling air, and to ensure the cleanliness of the cooling airflow and the long-term operational reliability of the equipment.

[0054] In one alternative embodiment, the air cooling gun is a vortex tube type air cooling gun, which has a spiral vortex generating channel inside and a hot end exhaust port at the end of the vortex tube type air cooling gun away from the cold air outlet.

[0055] Among them, the vortex tube type air cooler refers to an air cooler that utilizes the vortex tube effect to achieve heat separation. It has an internal spiral structure that causes compressed air to rotate at high speed, forming a vortex. For example, an F-type vortex tube is used as the air cooler, and the vortex tube has a vortex generating chamber formed by precision spiral grooves machined inside. The spiral vortex generating channel refers to the spiral channel inside the vortex tube type air cooler used to guide compressed air to form a high-speed rotating vortex airflow. For example, multiple Archimedean spiral grooves are machined on the inner wall of the vortex tube's inlet section. After the compressed air enters, it flows along the spiral grooves and accelerates, forming a low-temperature, low-pressure vortex core at the center of the tube.

[0056] Among them, the hot end exhaust port refers to the opening on the vortex tube type air cooler gun used to discharge the hot air flow generated after separation; for example, the tail end of the F-type vortex tube far from the cold air outlet is provided with an exhaust hole with a diameter of about 8mm. The hot air flow is ejected from the exhaust hole at high speed, and the exhaust temperature is 50°C to 80°C higher than the intake temperature.

[0057] Among the above-mentioned optional methods, a vortex tube type air cooler with a built-in spiral vortex generating channel is further adopted. By rotating compressed air at high speed in the vortex tube, hot and cold air streams are separated. Low-temperature cold air can be continuously generated without additional refrigerant, simplifying the system structure and improving the cooling response speed.

[0058] In one alternative embodiment, an impedance composite silencer is fitted around the outside of the hot-end exhaust port, and the housing of the impedance composite silencer is filled with sound-absorbing fiber material.

[0059] Among them, the impedance composite silencer refers to a device that combines resistive and reactive silencing principles to reduce exhaust noise; for example, a cylindrical silencer consisting of an aluminum alloy shell and internal glass wool sound-absorbing material is fitted outside the exhaust port at the hot end of a vortex tube. The silencer has perforated pipes and porous sound-absorbing layers inside, reducing exhaust noise from 105dB to 82dB. Sound-absorbing fiber material refers to a material with a porous and loose structure that converts sound energy into heat energy through fiber vibration and friction after sound waves are incident; for example, centrifugal glass wool with a density of 32kg / m³ and a fiber diameter of approximately 5μm is filled between the inner wall of the silencer shell and the perforated pipe.

[0060] In the above-mentioned optional methods, an impedance composite silencer filled with sound-absorbing fiber material is further installed on the outside of the hot-end exhaust port. The resistive and reactive composite silencer structure absorbs and reflects exhaust noise energy, reduces the operating noise level of the device, and improves the on-site working environment.

[0061] In one alternative embodiment, the pressure reducing valve is a manual knob-type pressure reducing valve with a graduated ring marked with multiple flow rate settings.

[0062] The scale ring refers to a ring-shaped indicator component with scale lines and numerical markings, either fitted onto the outside of the pressure reducing valve knob or printed on the valve body surface. For example, the bottom of the black plastic knob of the Type B manual knob-type pressure reducing valve is fitted with a silver aluminum alloy scale ring, with Arabic numerals 1 to 6 and corresponding short scale lines laser-etched on the ring surface. A manual knob-type pressure reducing valve refers to a pressure reducing valve that adjusts the outlet pressure or flow rate by manually rotating the knob on top of the valve body to change the valve core position. For example, the Type B pressure reducing valve has a 40mm diameter circular knob on top, allowing the operator to adjust the outlet pressure range from 0.05MPa to 0.85MPa by hand. The flow rate settings refer to the discrete positions marked on the scale ring, each corresponding to a preset compressed air flow rate range or pressure reducing valve opening state. For example, the scale ring may mark four flow rate settings, corresponding to approximately 50L / min for the first setting, approximately 80L / min for the second setting, approximately 110L / min for the third setting, and approximately 140L / min for the fourth setting (standard state).

[0063] In the above-mentioned optional methods, the pressure reducing valve is further designed as a manual knob structure with a scale marking ring, which enables precise adjustment and intuitive quantitative control of the compressed air flow rate through multiple flow rate levels, making it easy for operators to quickly set and lock the appropriate flow rate according to actual cooling needs.

[0064] In one alternative embodiment, the air inlet of the insulated box is located in the lower region of the side wall of the insulated box, and a lifting ring assembly is fixedly connected to the top outer wall of the insulated box.

[0065] The lower region refers to the area on the side wall of the insulated box that is close to the bottom. For example, when the total height of the insulated box is 200mm, the area from the bottom to 60mm above the bottom of the side wall is defined as the lower region, and the air inlet is located 30mm above the bottom. The top outer wall refers to the outer surface of the upper surface of the insulated box. For example, the upper surface of a 400mm × 300mm weathering steel plate on the top of the insulated box is the top outer wall, and the lifting ring assembly is welded and fixed to the upper surface.

[0066] Among them, the lifting ring assembly refers to: a combination of metal ring-shaped components fixed to the top outer wall of the insulation box for lifting or suspending the installation device; for example, M8 lifting ring nuts made of 304 stainless steel are welded to the four corners of the top outer wall of the insulation box, and the four lifting ring nuts, together with the wire rope rigging, can lift the insulation box as a whole to the installation position below the boiler steel frame platform.

[0067] In the above-mentioned optional method, the air inlet is further opened in the lower part of the side wall of the heat preservation box, so that the cold air enters from the bottom of the cavity and naturally diffuses upward to fill the entire cavity, forming a uniform and stable temperature distribution. The lifting ring assembly fixedly connected to the top outer wall facilitates the on-site hoisting and position adjustment of the device.

[0068] The technical solution in this embodiment can be further combined with the actual needs of on-site operation and maintenance of thermal power plants to expand the function and optimize the structure of the precision instrument cooling device, thereby improving the environmental adaptability, ease of operation and long-term operational reliability of the device while meeting the cooling needs of precision instruments.

[0069] In an extended embodiment, a temperature sensing element is also fixed inside the insulation box. This element is positioned within the containment cavity and spaced apart from the precision instrument. The signal output of the temperature sensing element is led to the outside of the insulation box via a shielded cable and electrically connected to a display and recording instrument. For example, a platinum resistance temperature sensor (caliber Pt100) is fixed on a bracket on the inner wall of the insulation box near the precision instrument. The probe of the platinum resistance temperature sensor is approximately 15mm from the outer casing of the precision instrument. The shielded cable passes through a cable hole in the side wall of the insulation box and is sealed with high-temperature resistant sealant. The other end of the cable is connected to a paperless recorder installed on the boiler platform control cabinet. With this extended setup, operators can obtain the actual temperature value inside the containment cavity in real time without opening the insulation box, thereby determining whether the current cooling effect meets the normal operating requirements of the precision instrument and avoiding instrument malfunctions caused by insufficient or excessive cooling.

[0070] Furthermore, based on the previous extended embodiment, an audible and visual alarm module linked to the temperature detection element is also installed on the outside of the insulation box. This module issues an alarm signal when the temperature inside the containment cavity exceeds a preset threshold range. For example, the upper limit of the temperature alarm inside the paperless recorder is set to 40°C and the lower limit to -20°C. When the platinum resistance temperature sensor detects that the temperature inside the containment cavity is higher than 40°C or lower than -20°C, the paperless recorder outputs a switch signal to drive the red warning light and buzzer mounted on the control cabinet panel. This extended setting can significantly improve the timeliness of detecting device malfunctions, provide clear instructions for maintenance personnel to proactively intervene, and prevent the performance of precision instruments from deteriorating due to prolonged exposure to overheating or undercooling conditions.

[0071] In another extended embodiment, a bypass branch is connected in parallel to the airflow pipeline between the pressure reducing valve and the air cooler. A solenoid valve is connected in series on the bypass branch, and the control terminal of the solenoid valve is connected to a timer controller. For example, a 6mm inner diameter polyurethane hose is led out from the stainless steel bellows between the outlet of the pressure reducing valve and the inlet of the air cooler via a tee connector as a bypass branch. A normally closed two-position two-way solenoid valve is installed on the bypass branch, and the coil lead of the solenoid valve is connected to a programmable timer controller. The timer controller outputs pulse signals according to a set period to control the solenoid valve to open periodically and briefly. When the solenoid valve opens, a portion of the compressed air is directly discharged into the atmosphere through the bypass branch or led downstream of the hot end exhaust port of the air cooler, instantly reducing the flow rate of compressed air entering the inlet of the air cooler. This generates a brief temperature fluctuation pulse in the cold air output, which can be used to effectively blow away any trace amounts of condensate film or frost layer that may have accumulated inside the insulation box. This extended configuration addresses the potential impact of condensation or micro-icing on the cold end surface of vortex tube cooling during long-term continuous operation on the surface of precision instruments, further enhancing the applicability of the device in high-temperature and high-humidity seasons.

[0072] In another extended embodiment, an airflow distribution guide plate is installed inside the air inlet of the insulation box. The surface of the airflow distribution guide plate has multiple arrayed guide holes. For example, a 304 stainless steel sheet measuring 80mm × 80mm and with a thickness of 1.5mm is welded inside the air inlet of the insulation box as the airflow distribution guide plate. A 10mm gap is left between the stainless steel sheet and the inner wall of the insulation box. The surface of the stainless steel sheet is laser-cut to form a quincunx array of guide holes with a diameter of 3mm and a spacing of 5mm. The low-temperature cold air entering through the air inlet first impacts the back side of the airflow distribution guide plate, and after being evenly dispersed through the guide holes, it diffuses into the receiving cavity at a lower flow rate, avoiding direct impact of high-speed cold air jets on the precision instrument housing, which could cause localized overcooling or measurement errors. This extended configuration makes the temperature distribution within the receiving cavity more uniform, and the cooling process for the precision instruments installed in the central area of ​​the receiving cavity is more gradual and controllable.

[0073] It should be noted that the above-described extended embodiments can be applied individually to the aforementioned precision instrument cooling device, or they can be arbitrarily combined according to the actual working conditions on site. For example, the temperature detection element, the audible and visual alarm module, and the timed bypass branch can be integrated into the same device to form an integrated precision instrument cooling system with temperature monitoring, abnormal alarm, and automatic defrosting functions. The above-described extensions do not exceed the scope of the core inventive concept of this invention, namely, constructing a locally controllable low-temperature environment through the combination of an insulation box and an air cooling gun, and supplementing it with auxiliary functional modules to improve the overall operating efficiency of the system under complex industrial site conditions. Any adaptive adjustments made by those skilled in the art to some structural parameters and control logic based on the disclosure of this invention and in combination with specific application scenarios should be considered as falling within the protection scope of this invention.

[0074] The present invention provides a precision instrument cooling system, including the precision instrument cooling device as provided in the present invention.

[0075] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and represent a limitation on a specific order or sequence. Where appropriate, the order of use for similar objects can be interchanged so that the embodiments of this application described herein can be implemented in an order other than that shown or described.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A precision instrument cooling device, characterized in that, include: Insulated box, air cooling gun, and pressure reducing valve; The insulated box has an internal cavity, and an air inlet communicating with the cavity is provided on the side wall of the insulated box. The cavity accommodates precision instruments. The air cooling gun has a cold air outlet, which is connected to the air inlet; The pressure reducing valve is connected to the airflow pipeline between the compressed air source and the air inlet of the air cooler. The pressure reducing valve is used to regulate the flow rate of the compressed air flowing to the air cooler through the pressure reducing valve.

2. The precision instrument cooling device according to claim 1, characterized in that, The seams of the insulated box are fitted with high-temperature resistant elastic sealing strips.

3. The precision instrument cooling device according to claim 1, characterized in that, The wall of the insulated box is composed of an inner heat-resistant alloy liner, an outer weather-resistant steel liner, and an aerogel insulation interlayer filled between the inner heat-resistant alloy liner and the outer weather-resistant steel liner.

4. The precision instrument cooling device according to claim 3, characterized in that, The front wall of the insulated box is fitted with a pressure-resistant observation window, which is composed of double-layer borosilicate glass plates, with the gap between the double-layer borosilicate glass plates evacuated to a vacuum state.

5. The precision instrument cooling device according to claim 1, characterized in that, An oil-water separator filter is connected in series between the compressed air source and the pressure reducing valve in the airflow pipeline. The input end of the oil-water separator filter is connected to the compressed air source, and the output end of the oil-water separator filter is connected to the input end of the pressure reducing valve.

6. The precision instrument cooling device according to claim 1, characterized in that, The air cooling gun is a vortex tube type air cooling gun, which has a spiral vortex generating channel inside and a hot end exhaust port at the end of the vortex tube type air cooling gun away from the cold air outlet.

7. The precision instrument cooling device according to claim 6, characterized in that, An impedance composite silencer is fitted on the outside of the hot end exhaust port, and the outer shell of the impedance composite silencer is filled with sound-absorbing fiber material.

8. The precision instrument cooling device according to claim 1, characterized in that, The pressure reducing valve is a manual knob-type pressure reducing valve with a scale marking ring, on which multiple flow rate levels are marked.

9. The precision instrument cooling device according to claim 1, characterized in that, The air inlet of the insulated box is located in the lower part of the side wall of the insulated box, and a lifting ring assembly is fixedly connected to the top outer wall of the insulated box.

10. A precision instrument cooling system, characterized in that, Includes the precision instrument cooling device as described in any one of claims 1 to 9.

Images