A device and method for testing the overall thermal insulation performance of an air conditioning and ventilation system

Abstract

The present invention discloses a device for testing the overall thermal insulation performance of an air conditioning and ventilation system and a testing method thereof, which relates to the field of machine testing technology, and includes: a ventilation duct, wherein two ventilation ducts are provided; a testing assembly, wherein the testing assembly is fixedly installed on the top of one of the ventilation ducts, and wherein the testing assembly includes a support frame and a slideway. The present invention starts an electric push rod, so that the electric push rod drives a moving frame to slide inside the slideway when it is extended and retracted. When the highest point of the arc surface at the top of the moving frame contacts the contact block, the position of the heat flux meter is raised under the rebound action of the connecting spring. When the side of the arc surface contacts the contact block, the receiving plate is pressed downward, thereby driving the movable rod to move downward, and the heat flux meter is pressed downward under the connection of the reinforcing plate, so that the probe of the heat flux meter contacts the ventilation duct, and the heat flux density of the ventilation duct is detected, thereby completing the test of the thermal insulation performance of the air conditioning and ventilation system.

Description

Technical Field

[0001] The present invention relates to the technical field of machine testing, and in particular to a device and method for testing the overall thermal insulation performance of an air-conditioning and ventilation system. Background Art

[0002] An air conditioning and ventilation system refers to a system that uses a series of equipment and devices to process, transport and distribute air. Its main functions include: providing a comfortable environment, air treatment, air circulation, energy conservation and emission reduction. The components of an air conditioning and ventilation system usually include: air treatment equipment: such as filters, heaters, coolers, etc., air supply ducts: transport the treated air to each room, return air ducts: recycle indoor air, air vents: used for air supply and return, control systems: adjust the operation of the system. In order to ensure that the system consumes less energy during operation, avoid condensation on the surface of pipes and equipment, and prevent corrosion and damage, the overall thermal insulation performance of the air conditioning and ventilation system needs to be tested.

[0003] In the prior art, the connection between the pipes of the air-conditioning and ventilation system is a key part where heat loss occurs, and is representative of the overall thermal insulation performance of the system. A common method for measuring the temperature of the pipe-to-pipe connection is to use a temperature sensor to detect the surface of the pipe. However, there are inaccuracies in judging the thermal insulation performance by detecting the surface temperature of the pipe. Determining the thermal insulation performance by measuring the heat flux density can more accurately evaluate the thermal insulation condition of the pipe, which helps to identify defects or problem areas in the thermal insulation system for repair or improvement.

[0004] Therefore, we propose an overall thermal insulation performance testing device and a testing method for an air-conditioning and ventilation system in order to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for testing the overall thermal insulation performance of an air-conditioning and ventilation system, so as to solve the problem of poor accuracy caused by judging the thermal insulation performance by detecting the surface temperature of the pipeline proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an overall thermal insulation performance testing device for an air-conditioning and ventilation system, comprising: a ventilation duct, wherein two ventilation ducts are provided; a test assembly, wherein the test assembly is fixedly installed on the top of one of the ventilation ducts, the test assembly comprises a support frame and a slide, the support frame is fixedly installed on the top of the ventilation duct, a movable rod is slidably embedded in the top of the support frame, a reinforcing plate is fixedly connected to the bottom end of the movable rod, a heat flux meter is arranged at the bottom of the reinforcing plate, a receiving plate is fixedly connected to the top of the movable rod, a contact block is fixedly connected to the top of the receiving plate, a moving frame is slidably connected to the inner wall of the slide, the inner top surface of the moving frame contacts the top of the contact block, one end of the slide is fixedly connected to the fixing plate, an electric push rod is arranged on the outer surface of the fixing plate, and one end of the electric push rod is fixedly connected to one side of the moving frame.

[0007] Preferably, both ends of each ventilation duct are fixedly connected with a connecting frame, the outer surface of each connecting frame is provided with a mounting groove, a sealing ring is arranged between the inner walls of every two mounting grooves, and every two connecting frames are connected by bolts.

[0008] Preferably, a connecting spring is provided on the outer surface of the movable rod, the top end of the connecting spring is fixedly connected to the bottom of the receiving plate, and the bottom end of the connecting spring is fixedly connected to the top of the supporting frame.

[0009] Preferably, side baffles are fixedly connected to the top of both sides of the movable frame, an anti-slip block is fixedly connected to the other end of the slide, a rotating rod is fixedly connected to the outer surface of the movable frame near the bottom, a block is fixedly connected to one end of the rotating rod, and an electrostatic dust removal roller is rotatably sleeved on the outer surface of the rotating rod.

[0010] Preferably, an air inlet assembly is arranged on the top of the other ventilation duct, and the air inlet assembly includes an air pump and an air inlet pipe, the air pump is arranged on the top of the other ventilation duct, the output end of the air pump is fixedly connected with a connecting pipe, one end of the connecting pipe is fixedly connected with a collar, the air inlet pipe runs through the other ventilation duct, the top of the air inlet pipe is fixedly connected with a fixing plate, the inner wall of the collar is engaged with the top of the air inlet pipe, and the collar and the fixing plate are installed by bolts.

[0011] Preferably, a detection component is arranged on the outer surface of the ventilation duct, and the detection component includes a connecting plate and two fixing rods, both ends of the two fixing rods are fixedly connected with fixing blocks, each of the fixing blocks is fixedly installed on the outer surface of the ventilation duct, and the outer surfaces of the two fixing rods are provided with a plurality of positioning holes.

[0012] Preferably, two positioning hooks are fixedly connected to one side of the connecting plate, and the outer surface of the positioning hooks is engaged with the inner wall of the positioning hole. Two positioning supports are fixedly connected to the bottom of the connecting plate, and the two positioning supports correspond to the positions of the two positioning hooks respectively.

[0013] Preferably, two connecting blocks are fixedly connected to the other side of the connecting plate, a support plate is fixedly connected between the outer surfaces of the two connecting blocks, an installation opening is opened on the outer surface of the support plate, a fixing frame is fixedly connected to one side of the installation opening, and a thermal imager is arranged on the inner wall of the fixing frame.

[0014] Preferably, the inner top surface of the fixed frame is rotatably connected to a one-way plate through a hinge, the inner wall of the fixed frame is fixedly connected to a limiting telescopic rod, one end of the limiting telescopic rod is fixedly connected to a push plate, and a limiting spring is arranged on the outer surface of the limiting telescopic rod, and the two ends of the limiting spring are respectively fixedly connected to the outer surface of the push plate and the inner wall of the fixed frame.

[0015] A testing method for an overall thermal insulation performance testing device for an air conditioning and ventilation system comprises the following steps:

[0016] S1. The air inlet assembly and the detection assembly are installed on the same ventilation duct, and the test assembly is installed on another ventilation duct. Every two ventilation ducts to be tested form a group. The ventilation ducts in the same group are connected using a connection frame. The two connection frames are fixed with multiple bolts. The sealing ring is pasted between the two installation grooves. When the two connection frames are installed together, the sealing performance of the sealing ring can prevent air leakage at the connection of the two ventilation ducts;

[0017] S2. When testing the thermal insulation performance of the air conditioning and ventilation system, the electric push rod is started so that the electric push rod drives the moving frame to slide inside the slide when it is extended and retracted, and the arc surface on the top of the moving frame contacts the contact block. When the highest point of the arc surface contacts the contact block, the position of the heat flux meter is raised under the rebound action of the connecting spring, so that the probe of the heat flux meter is separated from the surface of the ventilation duct. When the side of the arc surface contacts the contact block, the receiving plate is pressed downward, thereby driving the movable rod to move downward, and the heat flux meter is pressed downward under the connection of the reinforcing plate, so that the probe of the heat flux meter contacts the ventilation duct, completing the detection of the heat flux density of the ventilation duct, thereby completing the test of the thermal insulation performance of the air conditioning and ventilation system. When the moving frame moves inside the slide, it also drives the electrostatic dust removal roller to wipe the test position clean to avoid errors in the test.

[0018] S3. Use a thermal imager to test the parts of the ventilation duct with poor thermal insulation performance to facilitate targeted maintenance. When installing the thermal imager, insert the positioning hook into the positioning hole to complete the installation of the connecting plate. The installation height is adjustable. The positioning support can play a supporting role to prevent the detection component from shaking. When installing the thermal imager, insert the thermal imager into the fixed frame. At this time, the one-way plate can only be flipped inward. After being inserted, the push plate is pushed outward by the rebound effect of the limit spring, thereby holding the back of the thermal imager. The function of the limit telescopic rod is to prevent the limit spring from shifting. When taking it out, the one-way plate can be pulled out by pushing it inward;

[0019] S4. Connect the input port of the air pump to the hot air duct and the cold air duct respectively. By starting the air pump, the air pump draws the hot air or cold air connected to the external duct into the connecting pipe, and then transports it to the inside of the air inlet pipe, thereby changing the internal environment of the ventilation duct, so that the heat flow meter can test the internal thermal insulation performance of the ventilation duct at different temperatures and different flow rates.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. When in use, by starting the electric push rod, the electric push rod drives the moving frame to slide inside the slideway when it is extended and retracted. When the highest point of the arc surface on the top of the moving frame contacts the contact block, the position of the heat flux meter will be raised under the rebound action of the connecting spring. When the side of the arc surface contacts the contact block, the receiving plate will be pressed downward, thereby driving the movable rod to move downward. The heat flux meter will be pressed downward under the connection of the reinforcing plate, so that the probe of the heat flux meter contacts the ventilation duct, and the heat flux density of the ventilation duct is detected, thereby completing the test of the thermal insulation performance of the air conditioning ventilation system. When the moving frame moves inside the slideway, the electrostatic dust removal roller sleeved on the outside of the rotating rod contacts the test position of the heat flux meter. Under the wiping action of the electrostatic dust removal roller, the test position can be wiped clean to avoid errors in the test;

[0022] 2. When in use, the sealing performance of the sealing ring can prevent air leakage at the connection of the two ventilation ducts. When the heat flow meter tests the thermal insulation performance, the air pump input port is connected to the hot air duct and the cold air duct respectively. By starting the air pump, the air pump draws the hot air or cold air connected to the external duct into the connecting pipe, and then transports it to the inside of the air inlet pipe, thereby changing the internal environment of the ventilation duct, so that the heat flow meter can test the internal thermal insulation performance of the ventilation duct at different temperatures and different flow rates, which is comprehensive. Among them, the collar is clamped on the top of the air inlet pipe, which has sealing performance and can prevent gas leakage;

[0023] 3. During use, when the heat flux meter tests that the thermal insulation performance inside the ventilation duct is poor, the thermal imager is used to test the parts of the ventilation duct with poor thermal insulation performance to facilitate targeted maintenance. When installing the thermal imager, insert the positioning hook into the positioning hole to complete the installation of the connecting plate. The installation height is adjustable, and the positioning support can play a supporting role to prevent the detection component from shaking. When installing the thermal imager, the thermal imager is inserted into the inside of the fixed frame. At this time, the one-way plate can only be flipped inward. After it is inserted, the push plate is pushed outward by the rebound effect of the limit spring, thereby holding the back of the thermal imager. The function of the limit telescopic rod is to prevent the limit spring from shifting. When taking it out, the thermal imager can be pulled out by pushing the one-way plate inward. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A side perspective view of a device for testing the overall thermal insulation performance of an air-conditioning and ventilation system according to the present invention;

[0025] Figure 2 A three-dimensional diagram of a device for testing the overall thermal insulation performance of an air-conditioning and ventilation system according to the present invention from another angle;

[0026] Figure 3 It is a three-dimensional diagram of the structure of the ventilation duct part of a device for testing the overall thermal insulation performance of an air-conditioning and ventilation system according to the present invention;

[0027] Figure 4 It is a perspective view of the partial structure of the air inlet component of the overall thermal insulation performance testing device of the air conditioning and ventilation system of the present invention;

[0028] Figure 5 It is a perspective view of the structure of the detection component of the overall thermal insulation performance test device of the air-conditioning and ventilation system of the present invention;

[0029] Figure 6 It is a partially cutaway stereoscopic view of a detection component of a device for testing the overall thermal insulation performance of an air-conditioning and ventilation system of the present invention;

[0030] Figure 7 It is a sectional perspective view of a fixed frame portion of a device for testing the overall thermal insulation performance of an air-conditioning and ventilation system according to the present invention;

[0031] Figure 8 A partial three-dimensional diagram of a test assembly of a device for testing the overall thermal insulation performance of an air-conditioning and ventilation system according to the present invention;

[0032] Fig. 9 This is a three-dimensional diagram of the structure of the movable frame portion of a device for testing the overall thermal insulation performance of an air-conditioning and ventilation system according to the present invention.

[0033] In the figure:

[0034] 1. Air inlet assembly; 101. Air pump; 102. Air inlet pipe; 103. Connecting pipe; 104. Ring; 105. Fixed plate; 2. Detection assembly; 201. Fixed block; 202. Fixed rod; 203. Positioning hole; 204. Support plate; 205. Connecting block; 206. Connecting plate; 207. Fixed frame; 208. Thermal imager; 209. Positioning hook; 210. Positioning support; 211. Mounting port; 212. One-way plate; 213. Limit spring; 214. Limit telescopic rod ; 215, push plate; 3, test assembly; 301, support frame; 302, movable rod; 303, connecting spring; 304, reinforcing plate; 305, heat flux meter; 306, receiving plate; 307, contact block; 308, slideway; 309, fixed plate; 310, electric push rod; 311, anti-slip block; 312, moving frame; 313, side baffle; 314, rotating rod; 315, block; 316, electrostatic dust removal roller; 4, ventilation duct; 5, connecting frame; 6, installation groove; 7, sealing ring. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Reference Figure 1-9 As shown: a device for testing the overall thermal insulation performance of an air-conditioning and ventilation system, comprising: a ventilation duct 4, two ventilation ducts 4 are provided; a test assembly 3, the test assembly 3 is fixedly installed on the top of one of the ventilation ducts 4, the test assembly 3 comprises a support frame 301 and a slide 308, the support frame 301 is fixedly installed on the top of the ventilation duct 4, a movable rod 302 is slidably embedded in the top of the support frame 301, a reinforcing plate 304 is fixedly connected to the bottom end of the movable rod 302, a heat flux meter 305 is arranged at the bottom of the reinforcing plate 304, a receiving plate 306 is fixedly connected to the top of the receiving plate 306, a contact block 307 is fixedly connected to the top of the receiving plate 306, a moving frame 312 is slidably connected to the inner wall of the slide 308, the inner top surface of the moving frame 312 is in contact with the top of the contact block 307, one end of the slide 308 is fixedly connected to a fixed plate 309, an electric push rod 310 is arranged on the outer surface of the fixed plate 309, and one end of the electric push rod 310 is fixedly connected to one side of the moving frame 312.

[0037] like Figure 1-3As shown, both ends of each ventilation duct 4 are fixedly connected with a connecting frame 5, the outer surface of each connecting frame 5 is provided with a mounting groove 6, a sealing ring 7 is arranged between the inner walls of every two mounting grooves 6, every two connecting frames 5 are connected by bolts, every two ventilation ducts 4 to be tested form a group, and the ventilation ducts 4 in the same group are connected using the connecting frame 5, and the two connecting frames 5 are fixed with multiple bolts, and the sealing ring 7 is pasted between the two mounting grooves 6. When the two connecting frames 5 are installed together, the sealing performance of the sealing ring 7 can prevent air leakage at the connection between the two ventilation ducts 4.

[0038] like Figure 1 , Figure 2 , Figure 8 and Fig. 9 As shown, a connecting spring 303 is provided on the outer surface of the movable rod 302, the top end of the connecting spring 303 is fixedly connected to the bottom of the receiving plate 306, and the bottom end of the connecting spring 303 is fixedly connected to the top of the support frame 301, so that the connecting spring 303 can generate an upward elastic force on the receiving plate 306.

[0039] like Figure 1 , Figure 2 , Figure 8 and Fig. 9 As shown, the tops of both sides of the moving frame 312 are fixedly connected with side baffles 313, the other end of the slide 308 is fixedly connected with an anti-slip block 311, the outer surface of the moving frame 312 is fixedly connected with a rotating rod 314 near the bottom, one end of the rotating rod 314 is fixedly connected with a stopper 315, the outer surface of the rotating rod 314 is rotatably sleeved with an electrostatic dust roller 316, the side baffles 313 can effectively prevent the contact block 307 from being displaced, wherein the anti-slip block 311 can prevent the moving frame 312 from sliding out of the slide 308, when the moving frame 312 moves inside the slide 308, the rotating rod 314 is driven to move at the same time, the electrostatic dust roller 316 sleeved on the outside of the rotating rod 314 contacts with the test position of the heat flow meter 305, and the test position can be wiped clean by the wiping action of the electrostatic dust roller 316 to avoid errors in the test.

[0040] like Figure 1-4As shown, an air inlet assembly 1 is arranged at the top of another ventilation duct 4, and the air inlet assembly 1 includes an air pump 101 and an air inlet pipe 102. The air pump 101 is arranged at the top of another ventilation duct 4, and the output end of the air pump 101 is fixedly connected with a connecting pipe 103, and one end of the connecting pipe 103 is fixedly connected with a collar 104. The air inlet pipe 102 runs through another ventilation duct 4, and the top of the air inlet pipe 102 is fixedly connected with a fixing plate 105. The inner wall of the collar 104 is engaged with the top of the air inlet pipe 102, and the collar 104 and the fixing plate 105 are installed by bolts, so that the input port of the air pump 101 is respectively connected to the hot air duct 104 and the hot air duct 104. The air duct 103 is connected with the cold air duct, and by starting the air pump 101, the air pump 101 draws the hot air or cold air connected to the external pipe into the connecting pipe 103, and then transports it to the inside of the air inlet pipe 102, thereby changing the internal environment of the ventilation duct 4, so that the heat flow meter 305 can test the internal thermal insulation performance of the ventilation duct 4 at different temperatures and different flow rates, which is comprehensive. When installing the connecting pipe 103, the ring 104 is stuck on the top of the air inlet pipe 102, and then the ring 104 and the fixing plate 105 are fixed with multiple bolts, which is airtight and can prevent gas leakage.

[0041] like Figure 1 , Figure 2 and Figure 5-7 As shown, a detection component 2 is arranged on the outer surface of the ventilation duct 4, and the detection component 2 includes a connecting plate 206 and two fixing rods 202, both ends of the two fixing rods 202 are fixedly connected with fixing blocks 201, and each fixing block 201 is fixedly installed on the outer surface of the ventilation duct 4, and a plurality of positioning holes 203 are opened on the outer surfaces of the two fixing rods 202, and the plurality of positioning holes 203 can provide detection positions of different heights for the detection component 2.

[0042] like Figure 1 , Figure 2 and Figure 5-7 As shown, two positioning hooks 209 are fixedly connected to one side of the connecting plate 206, and the outer surface of the positioning hook 209 is engaged with the inner wall of the positioning hole 203. Two positioning supports 210 are fixedly connected to the bottom of the connecting plate 206. The two positioning supports 210 correspond to the positions of the two positioning hooks 209 respectively. The positioning hook 209 is inserted into the positioning hole 203 to complete the installation of the connecting plate 206. The installation height is adjustable. The positioning support 210 can play a supporting role to prevent the detection component 2 from shaking.

[0043] like Figure 1 , Figure 2 and Figure 5-7As shown, two connecting blocks 205 are fixedly connected to the other side of the connecting plate 206, and a support plate 204 is fixedly connected between the outer surfaces of the two connecting blocks 205. A mounting opening 211 is provided on the outer surface of the support plate 204, and a fixing frame 207 is fixedly connected to one side of the mounting opening 211. A thermal imager 208 is arranged on the inner wall of the fixing frame 207. When the heat flux meter 305 tests that the thermal insulation performance inside the ventilation duct 4 is poor, the thermal imager 208 is used to test the part with poor thermal insulation performance inside the ventilation duct 4. When the thermal imager 208 is installed, the thermal imager 208 is inserted into the inside of the fixing frame 207.

[0044] like Figure 1 , Figure 2 and Figure 5-7 As shown, the inner top surface of the fixed frame 207 is connected to a one-way plate 212 by a hinge rotation, the inner wall of the fixed frame 207 is fixedly connected to a limit telescopic rod 214, one end of the limit telescopic rod 214 is fixedly connected to a push plate 215, and a limit spring 213 is arranged on the outer surface of the limit telescopic rod 214, and the two ends of the limit spring 213 are respectively fixedly connected to the outer surface of the push plate 215 and the inner wall of the fixed frame 207, and the one-way plate 212 can only be flipped inwards. After being inserted, the push plate 215 is pushed outwards by the rebound effect of the limit spring 213, so as to resist the back side of the thermal imager 208, wherein the function of the limit telescopic rod 214 is to prevent the position of the limit spring 213 from shifting. When taking out, the thermal imager 208 can be pulled out by pushing the one-way plate 212 inwards.

[0045] In the present invention, when in use, the air intake assembly 1 and the detection assembly 2 are installed on the same ventilation duct 4, and the test assembly 3 is installed on another ventilation duct 4. Every two ventilation ducts 4 to be tested form a group, and the ventilation ducts 4 in the same group are connected using a connecting frame 5. A plurality of bolts are used to fix the two connecting frames 5. The sealing ring 7 is pasted between the two mounting grooves 6. When the two connecting frames 5 are installed together, the sealing performance of the sealing ring 7 can prevent air leakage at the connection between the two ventilation ducts 4. When testing the thermal insulation performance of the air conditioning and ventilation system, by starting the electric push rod 310, the electric push rod 310 drives the moving frame 312 to slide inside the slide 308 when it is extended and retracted, and the anti-slip block 311 can prevent the moving frame 312 from sliding off the slide When the movable frame 312 moves, the arc surface on its top contacts the contact block 307. When the highest point of the arc surface contacts the contact block 307, the position of the heat flux meter 305 is raised under the rebound effect of the connecting spring 303, so that the probe of the heat flux meter 305 is separated from the surface of the ventilation duct 4. When the side of the arc surface contacts the contact block 307, the receiving plate 306 is pressed downward, thereby driving the movable rod 302 to move downward. Under the connection of the reinforcing plate 304, the heat flux meter 305 is pressed downward, so that the probe of the heat flux meter 305 contacts the ventilation duct 4, completing the detection of the heat flux density of the ventilation duct 4, thereby completing the test of the thermal insulation performance of the air-conditioning ventilation system. The principle of thermal insulation performance test is based on the law that heat is always transferred from high temperature area to low temperature area. The specific manifestation of this principle is: heat flux density is related to temperature difference. The greater the temperature difference, the higher the heat flux density may be. High-quality thermal insulation materials can effectively reduce heat flux density and reduce heat transfer. By testing the heat flux density of different parts, the uniformity of thermal insulation performance can be determined. By comparing the heat flux density of different thermal insulation measures, the thermal insulation effect can be evaluated. By monitoring the heat flux density for a long time, the stability of thermal insulation performance can be understood. When the moving frame 312 moves inside the slide 308, it also drives the rotating rod 314 to move. The electrostatic dust removal roller 316 mounted on the outside of the rotating rod 314 contacts the test position of the heat flux meter 305. Under the wiping action of the electrostatic dust removal roller 316, the test position can be wiped. Wipe it clean to avoid errors in the test. The heat flux meter 305 is an existing device, and its internal structure will not be described in detail here. When the heat flux meter 305 tests that the thermal insulation performance inside the ventilation duct 4 is poor, the thermal imager 208 is used to test the parts with poor thermal insulation performance inside the ventilation duct 4. The specific principles include: heat is more easily lost in the poorly insulated parts, and the surface temperature is lower. The thermal imager 208 can detect this temperature difference and present it in the form of an image, which can quickly locate the area with poor thermal insulation performance, which is convenient for repair or improvement. The non-contact measurement will not interfere with the normal operation of the inside of the pipeline, and is convenient for targeted maintenance. Therefore, when installing the thermal imager 208, you need to choose a good position and insert the positioning hook 209 into the positioning hole 203.The connection plate 206 is installed, and the installation height is adjustable. The positioning support 210 can play a supporting role to prevent the detection component 2 from shaking. When the thermal imager 208 is installed, the thermal imager 208 is inserted into the fixed frame 207. At this time, the one-way plate 212 can only be flipped inward. After being inserted, the push plate 215 is pushed outward by the rebound effect of the limit spring 213, so as to support the back of the thermal imager 208. The function of the limit telescopic rod 214 is to prevent the position of the limit spring 213 from shifting. When taking it out, the one-way plate 212 is pushed inward to pull out the thermal imager 208, and the heat flux meter 305 is used to test the thermal insulation performance. When it is possible, the input port of the air pump 101 is connected to the hot air duct and the cold air duct respectively. By starting the air pump 101, the air pump 101 draws the hot air or cold air connected to the external duct into the connecting pipe 103, and then transports it to the inside of the air inlet pipe 102, thereby changing the internal environment of the ventilation duct 4, so that the heat flow meter 305 can test the internal thermal insulation performance of the ventilation duct 4 at different temperatures and different flow rates, which is comprehensive. When installing the connecting pipe 103, the collar 104 is stuck on the top of the air inlet pipe 102, and then the collar 104 and the fixing plate 105 are fixed with multiple bolts, which is airtight and can prevent gas leakage.

[0046] The wiring diagram of the air pump 101, thermal imager 208, heat flow meter 305 and electric push rod 310 in the present invention is common knowledge in the field, and its working principle is a well-known technology. The model is selected according to the actual use, so the control method and wiring layout of the air pump 101, thermal imager 208, heat flow meter 305 and electric push rod 310 are no longer explained in detail.

[0047] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for testing the overall thermal insulation performance of an air conditioning and ventilation system, characterized in that: include: A ventilation duct (4), wherein two ventilation ducts (4) are provided; A test assembly (3), wherein the test assembly (3) is fixedly mounted on the top of one of the ventilation ducts (4), and the test assembly (3) comprises a support frame (301) and a slideway (308), wherein the support frame (301) is fixedly mounted on the top of the ventilation duct (4), a movable rod (302) is slidably embedded in the top of the support frame (301), a reinforcing plate (304) is fixedly connected to the bottom end of the movable rod (302), a heat flow meter (305) is arranged at the bottom of the reinforcing plate (304), and the movable rod (302) is slidably embedded in the top of the support frame (301), a reinforcing plate (304) is fixedly connected to the bottom end of the movable rod (302), a heat flow meter (305) is arranged at the bottom of the reinforcing plate (304), and a heat flow meter (305) is arranged at the bottom of the reinforcing plate (304). The top of the rod (302) is fixedly connected to a receiving plate (306), the top of the receiving plate (306) is fixedly connected to a contact block (307), the inner wall of the slideway (308) is slidably connected to a moving frame (312), the inner top surface of the moving frame (312) is in contact with the top of the contact block (307), the inner top surface is an arc-shaped surface, one end of the slideway (308) is fixedly connected to a fixing plate (309), the outer surface of the fixing plate (309) is provided with an electric push rod (310), the electric push rod (310) 0) is fixedly connected to one side of the movable frame (312); both ends of each ventilation duct (4) are fixedly connected to a connecting frame (5), the outer surface of each connecting frame (5) is provided with a mounting groove (6), a sealing ring (7) is provided between the inner walls of each two mounting grooves (6), and each two connecting frames (5) are connected by bolts; a connecting spring (303) is provided on the outer surface of the movable rod (302), and the top end of the connecting spring (303) is fixedly connected to the bottom of the receiving plate (306). The bottom end of the connecting spring (303) is fixedly connected to the top of the support frame (301); the tops of both sides of the movable frame (312) are fixedly connected to side baffles (313); the other end of the slideway (308) is fixedly connected to an anti-dropping block (311); a rotating rod (314) is fixedly connected to the outer surface of the movable frame (312) near the bottom; one end of the rotating rod (314) is fixedly connected to a stopper (315); and an electrostatic dust removal roller (316) is rotatably sleeved on the outer surface of the rotating rod (314).

2. The overall thermal insulation performance testing device for the air conditioning and ventilation system according to claim 1, characterized in that: An air intake assembly (1) is arranged at the top of the other ventilation duct (4), the air intake assembly (1) comprising an air pump (101) and an air intake pipe (102), the air pump (101) being arranged at the top of the other ventilation duct (4), the output end of the air pump (101) being fixedly connected to a connecting pipe (103), one end of the connecting pipe (103) being fixedly connected to a collar (104), the air intake pipe (102) passing through the other ventilation duct (4), the top end of the air intake pipe (102) being fixedly connected to a fixing plate (105), the inner wall of the collar (104) being engaged with the top end of the air intake pipe (102), and the collar (104) and the fixing plate (105) being mounted by bolts.

3. The overall thermal insulation performance testing device for the air conditioning and ventilation system according to claim 2, characterized in that: A detection assembly (2) is arranged on the outer surface of the ventilation duct (4), the detection assembly (2) comprising a connecting plate (206) and two fixing rods (202), both ends of the two fixing rods (202) being fixedly connected to fixing blocks (201), each fixing block (201) being fixedly mounted on the outer surface of the ventilation duct (4), and a plurality of positioning holes (203) being provided on the outer surfaces of the two fixing rods (202).

4. The device for testing the overall thermal insulation performance of an air conditioning and ventilation system according to claim 3, characterized in that: Two positioning hooks (209) are fixedly connected to one side of the connecting plate (206), the outer surface of the positioning hook (209) is engaged with the inner wall of the positioning hole (203), and two positioning supports (210) are fixedly connected to the bottom of the connecting plate (206), the two positioning supports (210) respectively corresponding to the positions of the two positioning hooks (209).

5. The device for testing the overall thermal insulation performance of the air conditioning and ventilation system according to claim 4, characterized in that: Two connection blocks (205) are fixedly connected to the other side of the connection plate (206); a support plate (204) is fixedly connected between the outer surfaces of the two connection blocks (205); a mounting opening (211) is provided on the outer surface of the support plate (204); a fixing frame (207) is fixedly connected to one side of the mounting opening (211); a thermal imager (208) is provided on the inner wall of the fixing frame (207).

6. The device for testing the overall thermal insulation performance of an air conditioning and ventilation system according to claim 5, characterized in that: The inner top surface of the fixed frame (207) is rotatably connected to a one-way plate (212) via a hinge, the inner wall of the fixed frame (207) is fixedly connected to a limit telescopic rod (214), one end of the limit telescopic rod (214) is fixedly connected to a push plate (215), a limit spring (213) is provided on the outer surface of the limit telescopic rod (214), and two ends of the limit spring (213) are respectively fixedly connected to the outer surface of the push plate (215) and the inner wall of the fixed frame (207).

7. A testing method for an overall thermal insulation performance testing device for an air conditioning and ventilation system, characterized in that: The overall thermal insulation performance testing device for the air conditioning and ventilation system according to claim 6 is used, comprising the following steps: S1, the air inlet assembly (1) and the detection assembly (2) are installed on the same ventilation duct (4), and the test assembly (3) is installed on another ventilation duct (4). Every two ventilation ducts (4) to be tested form a group. The ventilation ducts (4) in the same group are connected using a connecting frame (5). The two connecting frames (5) are fixed with a plurality of bolts. The sealing ring (7) is pasted between the two mounting grooves (6). When the two connecting frames (5) are installed together, the sealing performance of the sealing ring (7) can prevent air leakage at the connection between the two ventilation ducts (4); S2. When testing the thermal insulation performance of the air conditioning and ventilation system, the electric push rod (310) is started so that the electric push rod (310) drives the moving frame (312) to slide inside the slideway (308) when it is extended and retracted, and the arc surface at the top of the electric push rod (310) contacts the contact block (307). When the highest point of the arc surface contacts the contact block (307), the position of the heat flow meter (305) is raised under the rebound action of the connecting spring (303), so that the probe of the heat flow meter (305) is separated from the surface of the ventilation duct (4). When the side edge of the arc surface contacts the contact block (3 07) when in contact, the receiving plate (306) is pressed downward, thereby driving the movable rod (302) to move downward, and the heat flux meter (305) is pressed downward under the connection of the reinforcing plate (304), so that the probe of the heat flux meter (305) contacts the ventilation duct (4), thereby completing the detection of the heat flux density of the ventilation duct (4), thereby completing the test of the thermal insulation performance of the air conditioning ventilation system, and when the moving frame (312) moves inside the slideway (308), it simultaneously drives the electrostatic dust removal roller (316) to wipe the test position clean, thereby avoiding errors in the test; S3. Use a thermal imager (208) to test the poor thermal insulation performance of the ventilation duct (4) to facilitate targeted maintenance. When installing the thermal imager (208), insert the positioning hook (209) into the positioning hole (203) to complete the installation of the connecting plate (206). The installation height is adjustable. The positioning support (210) can play a supporting role to prevent the detection component (2) from shaking. When installing the thermal imager (208), place the thermal imager (209) in the positioning hole (203). 08) is inserted into the interior of the fixed frame (207). At this time, the one-way plate (212) can only be turned inward. After being inserted, the push plate (215) is pushed outward by the rebound effect of the limit spring (213), thereby pressing the back of the thermal imager (208). The function of the limit telescopic rod (214) is to prevent the position of the limit spring (213) from shifting. When taking out, the one-way plate (212) is pushed inward to pull out the thermal imager (208); S4. Connect the input port of the air pump (101) to the hot air duct and the cold air duct respectively, and start the air pump (101) so that the air pump (101) draws the hot air or cold air connected to the external duct into the connecting pipe (103), and then transports it to the inside of the air inlet pipe (102), thereby changing the internal environment of the ventilation duct (4), so that the heat flow meter (305) can test the internal thermal insulation performance of the ventilation duct (4) at different temperatures and different flow rates.

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