Temperature-rise-resistant electric energy metering box and temperature rise test equipment thereof

Abstract

The invention relates to the technical field of temperature-rise-resistant electric energy metering box testing, in particular to a temperature-rise-resistant electric energy metering box and temperature rise testing equipment thereof, and the temperature-rise-resistant electric energy metering box comprises a box body, a heat dissipation module, a first sensing module and an automatic control module. Through real-time data feedback of the first temperature sensor and the first humidity sensor, the automatic control module can automatically trigger heat dissipation mode switching, and in a high-humidity environment, the first electric push rod drives the inverted-U-shaped cover plate to seal an outer air inlet and an outer heat dissipation opening to form a closed space; through cooperation with an inner circulation path of an air inducing flow channel, an inner air inducing opening, an air compression cooling unit, an air inducing barrel and an inner air outlet, external humid air can be isolated, the wiring terminal is prevented from being oxidized and corroded, and efficient cooling can be achieved through air compression cooling; in a low-humidity and high-temperature environment, the cover plate moves upwards to start external circulation, external air enters the box after dust is filtered out through the filter screen, and heat is taken away through rapid airflow circulation of the outer air inlet, the induced air flow channel and the outer heat dissipation opening.

Description

Technical Field

[0001] This invention relates to the field of temperature rise resistance power metering box testing technology, specifically a temperature rise resistance power metering box and its temperature rise testing equipment. Background Technology

[0002] As a critical terminal device in the power system, the electricity metering box directly affects the accuracy of electricity metering and the stability of the power grid, and is widely used in outdoor power distribution scenarios. However, the complexity of the outdoor environment poses a severe challenge to the metering box. Among them, the combined effect of high temperature and high humidity is the core cause of equipment failure: high humidity accelerates the oxidation of metal terminals, increases contact resistance, generates more Joule heat under the same current, and causes the temperature rise inside the box to be far greater than in a dry environment.

[0003] Existing temperature rise resistant power metering boxes are unable to cope with this problem: on the one hand, the heat dissipation mode is fixed, either using internal circulation, which can isolate moisture, but the compressor will increase energy consumption in the long term, or using external circulation, which can dissipate heat quickly, but will introduce moisture in high humidity environment, and cannot dynamically balance heat dissipation and moisture prevention according to the environment.

[0004] At the same time, existing temperature rise test equipment also has obvious shortcomings: it lacks the ability to simulate composite working conditions. Most equipment can only reproduce high temperature or high humidity environments, and cannot construct multi-factor coupled environments in actual outdoor scenarios such as high temperature-high humidity-salt spray, especially it is difficult to simulate the diffusion state of real coastal salt spray. Summary of the Invention

[0005] The purpose of this invention is to provide a temperature rise resistant power metering box and its temperature rise testing equipment to solve the problems mentioned in the background art.

[0006] The objective of this invention can be achieved through the following technical solutions: A temperature-resistant energy metering box, preferably comprising a box body, a heat dissipation module, a first sensing module, and an automatic control module; The first sensing module includes a first temperature sensor and a first humidity sensor disposed inside the main body of the box, for collecting temperature and humidity parameters inside the box; The heat dissipation module includes an internal circulation heat dissipation unit, an external circulation heat dissipation unit, and a conversion mechanism; The automatic control module is electrically connected to the first sensing module and the heat dissipation module respectively. Based on the detection results of the first temperature sensor and the first humidity sensor, the heat dissipation module is controlled to switch between internal circulation heat dissipation mode and external circulation heat dissipation mode through the switching mechanism to suppress the temperature rise inside the main body of the box.

[0007] Preferably, the internal circulation heat dissipation unit includes air ducts symmetrically arranged inside the main body of the box, a cooling fan is installed inside the air ducts, an internal circulation cooling chamber is installed at the bottom of the main body of the box, an internal air outlet is opened at the bottom of the air ducts and communicates with the inside of the internal circulation cooling chamber, an air compressor cooling unit is installed inside the internal circulation cooling chamber, the input end of the air compressor cooling unit is connected to the inside of the internal air outlet through a pipe, an air duct is fixedly connected to the middle section of the main body of the box, an internal air outlet is symmetrically opened at the top of the air duct, and the output end of the air compressor cooling unit is connected to the inside of the air duct through a pipe, forming a directional internal circulation airflow channel of "air intake-cooling-return air".

[0008] Preferably, the external circulation heat dissipation unit includes external heat dissipation vents symmetrically opened on the side wall of the main body of the box, the external heat dissipation vents are connected to the interior of the air duct, the top of the main body of the box is provided with an external air inlet, and a filter screen is fixedly connected inside the external air inlet. After the outside air is filtered by the filter screen, it enters the main body of the box, mixes with the hot air inside the box, and is discharged from the external heat dissipation vent through the air duct.

[0009] Preferably, the conversion mechanism includes symmetrically arranged lifting slides on the side walls of the main body of the box, with inverted U-shaped cover plates slidably arranged inside the two lifting slides. Support rods are symmetrically hinged to the top of the main body of the box, with the top of the support rods abutting against the inverted U-shaped cover plates. A first electric push rod is symmetrically hinged to the top of the main body of the box, with the output end of the first electric push rod hinged to the middle section of the support rod. The first electric push rod drives the support rod to lift and lower, causing the inverted U-shaped cover plates to slide along the lifting slides, thereby opening and closing the external heat dissipation vents. When the inverted U-shaped cover plates are closed, the system switches to internal circulation, and when they are open, the system switches to external circulation.

[0010] A temperature rise test device, preferably comprising a test chamber body, an environmental simulation module, a circulation control module, a second sensing module, and a linkage control module; The test chamber body is equipped with a test chamber and an equipment installation chamber. The second sensing module includes a second temperature sensor and a second humidity sensor located in the test chamber inside the test chamber body. The environmental simulation module includes a brine storage tank, a stirring mechanism, and a Venturi atomizing structure. The Venturi atomizing structure is used to atomize the brine mixture in the brine storage tank into salt mist and input it into the interior of the test chamber. The circulation control module includes an input nozzle and a circulation reflux suction head diagonally arranged inside the test chamber. The circulation reflux suction head includes a circulation branch and a moisture absorption branch, and the two branches can be switched. The linkage control module is electrically connected to the environmental simulation module and the circulation control module, respectively, to control the linkage between the stirring mechanism and the Venturi atomizing structure, and to adjust the working mode of the circulation control module based on the detection results of the sensing module.

[0011] Preferably, the Venturi atomizing structure includes a Venturi tube disposed inside the equipment installation chamber. The Venturi tube contains a tapered inlet section, a throat, and a tapered diffuser section. A throat adjustment unit is disposed inside the Venturi tube. The throat adjustment unit includes a conical piston rod disposed inside the Venturi tube and sliding axially back and forth to change the cross-sectional area of ​​its throat opening, thereby forming a pulsed negative pressure change.

[0012] Preferably, the throat adjustment unit further includes a drainage tube disposed at the throat of the venturi tube and connected to the bottom of the saline storage tank, and the drainage tube is provided with an opening and closing valve inside; The Venturi tube has an air inlet and an exhaust outlet at both ends. The exhaust outlet is connected to the input nozzle through a pipe. One end of the conical piston rod passes through the Venturi tube and is fixedly connected to the first push plate. A bellows is fixedly sleeved on the outer circumference of the conical piston rod. The other end of the bellows is fixedly sleeved on the outer circumference of the connection end between the conical piston rod and the Venturi tube for sealing and preventing leakage. One end of the first push plate is fixedly connected to a flow guiding slide rod, which is slidably connected to the inner wall of the test chamber body. A return spring is sleeved on the outer periphery of the flow guiding slide rod, and the return spring is located between the first push plate and the test chamber body.

[0013] Preferably, the stirring mechanism includes a dry compartment and a wet compartment disposed inside the brine storage tank, and multiple stirring rods are symmetrically and uniformly rotatably connected inside the wet compartment; The top of the stirring rod extends into the interior of the dry chamber and is fixedly connected to a gear. A rack is symmetrically slidably arranged inside the dry chamber. One end of the rack passes through the brine storage tank and is fixedly connected to a second push plate. The bottom of the second push plate is provided with a reciprocating slide groove. A reciprocating wheel is rotatably connected inside the equipment installation compartment of the main body of the test box. A reciprocating convex rod is eccentrically rotatably connected to the top of the reciprocating wheel. The reciprocating convex rod is set inside the reciprocating slide groove. A worm gear is fixedly connected to one end of the reciprocating wheel. A motor is fixedly connected inside the equipment installation compartment of the main body of the test box. A worm gear that meshes with the worm gear is fixedly connected to the output end of the motor.

[0014] Preferably, a transmission mechanism is provided between the stirring mechanism and the throat adjustment unit. The transmission mechanism includes a lifting slide rod that is slidably disposed inside the equipment mounting compartment of the test chamber body. An inverted L-shaped mounting plate is fixedly connected to the bottom of the lifting slide rod. The equipment installation compartment of the main body of the test box is fixedly connected to a second electric push rod. The output end of the second electric push rod is fixedly connected to the top of the inverted L-shaped mounting plate. A pair of abutting slide rods are slidably connected inside the inverted L-shaped mounting plate. A transmission plate is fixedly connected to one end of the two abutting slide rods. Abutting springs are sleeved on the outer periphery of the abutting slide rods. The abutting springs are located between the transmission plate and the inverted L-shaped mounting plate. One end of the transmission plate is provided with a pair of trapezoidal bosses and an unlocking platform. One end of the first push plate and the second push plate are rotatably connected to a contact roller that rolls against the trapezoidal bosses and the unlocking platform.

[0015] Preferably, a hot air pump is fixedly connected inside the equipment installation compartment of the main body of the test chamber. The output end of the hot air pump is fixedly connected to the air inlet through a pipe, and the input end of the hot air pump is fixedly connected to a double-headed air duct. A circulating filter box and a moisture-absorbing filter box are respectively installed inside the test compartment of the main body of the test chamber. The two input ends of the double-headed air duct are respectively connected to the circulating filter box and the moisture-absorbing filter box, and both input ends of the double-headed air duct are equipped with solenoid valves. The circulating branch is connected to the double-headed air duct and the hot air pump through the circulating filter box, and the moisture-absorbing branch is connected to the double-headed air duct and the hot air pump through the moisture-absorbing filter box. The moisture-absorbing branch also includes a molecular sieve adsorption block installed inside the moisture-absorbing filter box. After the circulating return air intake head draws in the gas in the test chamber, it is processed by the corresponding branch and then returned to the test chamber.

[0016] The beneficial effects of this invention are: 1. This invention utilizes real-time data feedback from the first temperature sensor and the first humidity sensor. The automatic control module can automatically trigger the switching of the heat dissipation mode. In a high humidity environment, the first electric actuator drives the inverted U-shaped cover to close the external air inlet and external heat dissipation outlet to form a sealed space. Combined with the internal circulation path of the air duct, internal air vent, compressed air cooling unit, air duct, and internal air outlet, it can not only isolate the external humid air and avoid oxidation and corrosion of the wiring terminals, but also achieve efficient cooling through compressed air cooling. In a low humidity and high temperature environment, the cover moves up to open the external circulation. External air enters the box after being filtered for dust by the filter screen. The heat is carried away by the rapid airflow circulation of the external air inlet, air duct, and external heat dissipation outlet.

[0017] 2. This invention uses a motor and a stirring rod to continuously prevent brine stratification. The transmission mechanism drives the conical piston rod to slide back and forth in the venturi tube, periodically changing the cross-sectional area of ​​the throat opening: when the opening narrows, the negative pressure increases to achieve strong suction, and when the opening widens, the negative pressure decreases to achieve weak suction. This pulsed change drives the brine to mix violently with the airflow delivered by the hot air pump, forming a micro-vortex effect, which greatly increases the contact area between the droplets and the air, and finally generates a uniformly dispersed salt mist.

[0018] 3. This invention controls the solenoid valve through the circulation control module to quickly switch between the circulation filter box and the moisture-absorbing filter box branch. Combined with the efficient dehumidification of the molecular sieve adsorption block, the test environment can be quickly reset, improving test efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the overall structure of the temperature rise resistant power metering box in this invention; Figure 2 This is a top cross-sectional view of the temperature rise resistant energy metering box in this invention; Figure 3 This is a schematic diagram of the overall structure of the temperature rise test equipment in this invention; Figure 4 This is a front sectional view of the temperature rise test equipment in this invention; Figure 5 This is a top sectional view of the temperature rise test equipment in this invention; Figure 6 This is a schematic diagram of the internal structure of the test chamber body in this invention; Figure 7 This is a schematic diagram showing the connection relationship between the Chinese-language tube and the brine storage tank in this invention; Figure 8 This is a schematic diagram of the internal structure of the Chinese-language tube of the present invention; Figure 9 This is an exploded view of the internal structure of the reciprocating chute in this invention; Figure 10 This is a schematic diagram of the internal structure of the brine storage tank in this invention; Figure 11 This is a three-dimensional structural diagram of the inverted L-shaped mounting plate in this invention.

[0020] The following labels are used in the attached diagram: 1. Main body of the chamber; 2. First temperature sensor; 3. First humidity sensor; 4. Automatic control module; 5. Airflow channel; 6. Cooling fan; 7. Internal circulation cooling chamber; 8. Internal air outlet; 9. Compressed air cooling unit; 10. Air duct; 11. Internal air outlet; 12. External heat dissipation outlet; 13. External air inlet; 14. Filter screen; 15. Lifting slide; 16. Inverted U-shaped cover plate; 17. Support rod; 18. First electric actuator; 20. Main body of the test chamber; 21. Second temperature sensor; 22. Second humidity sensor; 23. Input nozzle; 24. Venturi tube; 25. Drainage pipe; 26. Opening and closing valve; 27. Conical piston rod; 28. Air inlet; 29. ​​Exhaust outlet; 30. Corrugated pipe; 31. First push plate; 32. Drainage slide bar; 33. Return spring; 34. Brine storage tank; 35. Dry compartment; 36. Wet compartment; 37. Stirring rod; 38. Gear; 39. Rack; 40. Second push plate; 41. Reciprocating slide groove; 42. Reciprocating wheel; 43. Reciprocating convex rod; 44. Worm gear; 45. Motor; 46. Worm; 47. Lifting slide bar; 48. Inverted L-shaped mounting plate; 49. Abutment slide bar; 50. Abutment spring; 51. Transmission plate; 52. Trapezoidal boss; 53. Unlocking platform; 54. Second electric push rod; 55. Hot air pump; 56. Double-headed air duct; 57. Solenoid valve; 58. Circulating filter box; 59. Moisture-absorbing filter box; 60. Moisture sieve adsorption block; 61. Abutment roller; 62. Linkage control module. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] A temperature rise resistant power metering box and its temperature rise testing equipment are disclosed. The temperature rise resistant power metering box is a key terminal device in the power system. Its heat dissipation efficiency and moisture-proof performance, the inhibition of oxidation and corrosion of the wiring terminals, and the stable control of the temperature rise inside the box are achieved through real-time data feedback from the first temperature sensor and the first humidity sensor, the linkage design of the inverted U-shaped cover plate driven by the intelligent judgment and conversion mechanism of the automatic control module, and the coordinated operation of the efficient cooling of the internal circulation air compressor unit and the heat dissipation path of the external circulation filter screen. The temperature rise testing equipment is a core device for the performance testing of the power metering box. It is specifically designed to achieve accurate simulation of high temperature-high humidity-salt spray composite environment, dynamic control of temperature and humidity in the test chamber, and integrated operation of uniform salt spray generation and dispersion through the coordinated operation of the environmental simulation module, circulation control module, and linkage control module. At the same time, it can complete real-time data monitoring and automatic operation mode switching during the test process.

[0023] A temperature rise resistant power metering box, such as Figure 1-2 As shown, it includes the main body of the enclosure 1, a heat dissipation module, a first sensing module, and an automatic control module 4; The first sensing module includes a first temperature sensor 2 and a first humidity sensor 3 disposed inside the main body 1 of the box, for collecting temperature and humidity parameters inside the box; The heat dissipation module includes an internal circulation heat dissipation unit, an external circulation heat dissipation unit, and a conversion mechanism; The automatic control module 4 is electrically connected to the first sensing module and the heat dissipation module respectively. Based on the detection results of the first temperature sensor 2 and the first humidity sensor 3, the heat dissipation module is controlled to switch between internal circulation heat dissipation mode and external circulation heat dissipation mode through the switching mechanism to suppress the temperature rise inside the main body of the box. The internal circulation heat dissipation unit includes air ducts 5 symmetrically arranged inside the main body 1 of the box, a cooling fan 6 inside the air ducts 5, an internal circulation cooling chamber 7 at the bottom of the main body 1, an internal air vent 8 at the bottom of the air ducts 5 that communicates with the interior of the internal circulation cooling chamber 7, an air compressor cooling unit 9 inside the internal circulation cooling chamber 7, an input end of the air compressor cooling unit 9 that communicates with the interior of the internal air vent 8 through a pipe, an air duct 10 fixedly connected to the middle section of the main body 1 of the box, an internal air outlet 11 symmetrically arranged at the top of the air duct 10, and an output end of the air compressor cooling unit 9 that communicates with the interior of the air duct 10 through a pipe, forming a directional internal circulation airflow channel of "air intake-cooling-return air". Furthermore, the external circulation heat dissipation unit includes external heat dissipation vents 12 symmetrically opened on the side wall of the main body 1 of the box. The external heat dissipation vents 12 are connected to the interior of the air duct 5. An external air inlet 13 is opened on the top of the main body 1 of the box. A filter screen 14 is fixedly connected inside the external air inlet 13. After the outside air is filtered by the filter screen 14, it enters the main body 1 of the box, mixes with the hot air inside the box, and is discharged from the external heat dissipation vents 12 through the air duct 5. Furthermore, the conversion mechanism includes lifting slides 15 symmetrically opened on the side wall of the main body 1 of the box. Inverted U-shaped cover plates 16 are slidably arranged inside the two lifting slides 15. Support rods 17 are symmetrically hinged to the top of the main body 1 of the box. The top of the support rods 17 abuts against the inverted U-shaped cover plates 16. A first electric push rod 18 is symmetrically hinged to the top of the main body 1 of the box. The output end of the first electric push rod 18 is hinged to the middle section of the support rod 17. The first electric push rod 18 drives the support rod 17 to lift and lower, causing the inverted U-shaped cover plates 16 to slide along the lifting slides 15, thereby realizing the opening and closing of the external heat dissipation vent 12. When the inverted U-shaped cover plates 16 are closed, they switch to internal circulation, and when they are open, they switch to external circulation.

[0024] In use, firstly, the automatic control module 4 collects the temperature and humidity data inside the box in real time through the first temperature sensor 2 and the first humidity sensor 3 of the first sensing module. The first humidity sensor 3 continuously detects the humidity of the air inside the box. When the detected data reaches the high humidity threshold, it transmits the high humidity electrical signal to the automatic control module 4. The automatic control module 4 determines through its built-in logic that it is necessary to block the intrusion of moisture to avoid oxidation of the wiring terminals. Then it triggers the start command of the internal circulation heat dissipation mode and sends a control signal to the first electric push rod 18 to keep it contracted. The first electric actuator 18 remains in a retracted state, and its output end drives the support rod 17, which is hinged to it, to maintain a horizontal posture. The top of the support rod 17 is in close contact with the bottom of the inverted U-shaped cover plate 16, pushing the inverted U-shaped cover plate 16 to move vertically down along the lifting slide groove 15 on the side wall of the main body 1 of the box until the top edge of the inverted U-shaped cover plate 16 is sealed and fitted with the periphery of the external air inlet 13. The side wall completely covers the external heat dissipation vent 12, and finally forms a sealed space inside the main body 1 of the box, completely blocking the path of external humid air to enter. At this time, the internal circulation cooling operation is in progress. The automatic control module 4 simultaneously sends a start signal to the cooling fan 6 and the compressed air cooling unit 9. The cooling fan 6 rotates at high speed in the air intake channel 5, generating negative pressure suction, which draws the hot air generated by the operation of the components in the main body of the box into the air intake channel 5. The hot air flows downward along the air intake channel 5 and enters the internal circulation cooling chamber 7 through the inner air intake port 8 at the bottom of the air intake channel 5. The hot air fully exchanges heat with the cooling airflow output by the compressed air cooling unit 9 in the internal circulation cooling chamber 7, and the temperature decreases. The cooled air is transported to the air intake duct 10 in the middle section of the main body of the box through a special pipeline, and then flows back evenly to the inside of the main body of the box through the symmetrically distributed inner air outlets 11 at the top of the air intake duct 10, forming a closed circulation airflow of air intake channel 5-inner air intake port 8-compressed air cooling unit 9-air intake duct 10-inner air outlet 11, which stably reduces the temperature inside the box while isolating moisture. The automatic control module 4 continuously receives feedback data from the first sensing module: if the humidity always exceeds the high humidity threshold, the internal circulation heat dissipation mode is maintained. When the first humidity sensor 3 detects that the humidity drops below the low humidity threshold, the automatic control module 4 triggers a mode switching command, the internal circulation heat dissipation mode is exited, and the device enters standby mode. At this time, the first sensing module continuously collects data: when the first temperature sensor 2 and the first humidity sensor 3 detect that the temperature has reached the high temperature and low humidity threshold, the first temperature sensor 2 transmits the high temperature electrical signal to the automatic control module 4. The automatic control module 4 determines that the heat dissipation efficiency needs to be improved first, and then sends an external circulation heat dissipation mode start command and sends a lifting signal to the first electric push rod 18. The output axis of the first electric push rod 18 extends outward, pushing the support rod 17 to rotate upward around the hinge point at the top of the main body 1 of the box. The top of the support rod 17 pushes the inverted U-shaped cover plate 16 to move vertically upward along the lifting slide 15 until the inverted U-shaped cover plate 16 is completely separated from the external air inlet 13 and the external heat dissipation vent 12, opening the channel for air circulation between the main body 1 of the box and the outside. Automatic control module 4 starts cooling fan 6. The cooling fan 6 rotates to generate airflow, which draws external air in through the external air inlet 13 at the top of the main body 1. When the air passes through the filter 14 inside the external air inlet 13, dust, particulate matter and other impurities are filtered out to prevent them from entering the box and affecting the operation of the components. After the clean air enters the box, it is fully mixed with the hot air generated by the components. The mixed hot air is drawn into the air duct 5 by the cooling fan 6 and flows quickly along the air duct 5 to the external heat dissipation vents 12 on both sides of the main body 1, and is finally discharged outside the box. Through the continuous circulation of external air, the heat exchange between the inside of the box and the outside is accelerated, and excess heat is quickly removed.

[0025] A temperature rise test device, such as Figures 3-11 As shown, it includes the test chamber body 20, an environmental simulation module, a cycle control module, a second sensing module, and a linkage control module 62; The test chamber body 20 is equipped with a test chamber and an equipment installation chamber. The second sensing module includes a second temperature sensor 21 and a second humidity sensor 22 located in the test chamber inside the test chamber body 20. The environmental simulation module includes a brine storage tank 34, a stirring mechanism, and a Venturi atomizing structure. The Venturi atomizing structure is used to atomize the brine mixture in the brine storage tank 34 to form salt mist, which is then input into the interior of the test chamber body 20. The circulation control module includes an input nozzle 23 and a circulation return suction head, which are diagonally arranged inside the test chamber. The circulation return suction head includes a circulation branch and a moisture absorption branch, and the two branches can be switched. The linkage control module 62 is electrically connected to the environmental simulation module and the circulation control module respectively, controls the linkage between the stirring mechanism and the Venturi atomizing structure, and adjusts the working mode of the circulation control module based on the detection results of the sensing module. The Venturi atomizing structure includes a Venturi tube 24 installed inside the equipment installation chamber. The Venturi tube 24 contains a tapered inlet section, a throat, and a tapered diffuser section. The Venturi tube 24 is equipped with a throat adjustment unit, which includes a conical piston rod 27 that slides axially back and forth inside the Venturi tube 24 to change the cross-sectional area of ​​its throat opening and form a pulsed negative pressure change. Furthermore, the throat adjustment unit also includes a drainage tube 25 located at the throat of the venturi tube 24 and connected to the bottom of the saline storage tank 34, and an opening and closing valve 26 is provided inside the drainage tube 25. The Venturi tube 24 has an air inlet 28 and an exhaust port 29 at its two ends. The exhaust port 29 is connected to the input nozzle 23 through a pipe. One end of the conical piston rod 27 passes through the Venturi tube 24 and is fixedly connected to the first push plate 31. A bellows 30 is fixedly sleeved on the outer periphery of the conical piston rod 27. The other end of the bellows 30 is fixedly sleeved on the outer periphery of the connection end between the conical piston rod 27 and the Venturi tube 24 for sealing and preventing leakage. One end of the first push plate 31 is fixedly connected to a flow guide rod 32, which is slidably connected to the inner wall of the test chamber body 20. A return spring 33 is sleeved on the outer periphery of the flow guide rod 32, and the return spring 33 is located between the first push plate 31 and the test chamber body 20. Furthermore, the stirring mechanism includes a dry chamber 35 and a wet chamber 36 located inside the brine storage tank 34, and multiple stirring rods 37 are symmetrically and uniformly rotatably connected inside the wet chamber 36. The top of the stirring rod 37 extends into the interior of the dry chamber 35 and is fixedly connected to the gear 38. A rack 39 is symmetrically slidably arranged inside the dry chamber 35. One end of the rack 39 passes through the brine storage tank 34 and is fixedly connected to the second push plate 40. The bottom of the second push plate 40 is provided with a reciprocating slide groove 41. A reciprocating wheel 42 is rotatably connected inside the equipment installation compartment of the test box body 20. A reciprocating protrusion 43 is eccentrically rotatably connected to the top of the reciprocating wheel 42. The reciprocating protrusion 43 is set inside the reciprocating slide groove 41. A worm gear 44 is fixedly connected to one end of the reciprocating wheel 42. A motor 45 is fixedly connected inside the equipment installation compartment of the test box body 20. A worm 46 that meshes with the worm gear 44 is fixedly connected to the output end of the motor 45. Furthermore, a transmission mechanism is provided between the stirring mechanism and the throat adjustment unit. The transmission mechanism includes a lifting slide bar 47 that is slidably disposed inside the equipment installation compartment of the test chamber body 20. An inverted L-shaped mounting plate 48 is fixedly connected to the bottom of the lifting slide bar 47. The test chamber body 20 has a second electric push rod 54 fixedly connected inside the equipment installation compartment. The output end of the second electric push rod 54 is fixedly connected to the top of the inverted L-shaped mounting plate 48. A pair of abutting slide rods 49 are slidably connected inside the inverted L-shaped mounting plate 48. A transmission plate 51 is fixedly connected to one end of the two abutting slide rods 49. Abutting springs 50 are sleeved on the outer periphery of the abutting slide rods 49. The abutting springs 50 are located between the transmission plate 51 and the inverted L-shaped mounting plate 48. A pair of trapezoidal bosses 52 and an unlocking platform 53 are alternately arranged at one end of the transmission plate 51. One end of the first push plate 31 and the second push plate 40 are rotatably connected to a contact roller 61 that rolls against the trapezoidal bosses 52 and the unlocking platform 53. Furthermore, a hot air pump 55 is fixedly connected inside the equipment installation compartment of the test chamber body 20. The output end of the hot air pump 55 is fixedly connected to the air inlet 28 through a pipe, and the input end of the hot air pump 55 is fixedly connected to a double-headed air duct 56. The test chamber of the test chamber body 20 is respectively equipped with a circulating filter box 58 and a moisture-absorbing filter box 59. The two input ends of the double-headed air duct 56 are respectively connected to the circulating filter box 58 and the moisture-absorbing filter box 59. Solenoid valves 57 are installed at both input ends of the double-headed air duct 56. The circulating branch connects the circulating filter box 58 to the double-headed air duct 56 and the hot air pump 55, and the moisture-absorbing branch connects the moisture-absorbing filter box 59 to the double-headed air duct 56 and the hot air pump 55. The moisture-absorbing branch also includes a molecular sieve adsorption block 60 installed inside the moisture-absorbing filter box 59. After the circulating return air intake head draws in the gas in the test chamber, it is processed by the corresponding branch and then returned to the test chamber.

[0026] When using it, first, open the test chamber door of the test chamber body 20, fix the temperature rise resistance energy metering box to be tested through the positioning bracket in the test chamber, connect the wiring terminals of the metering box to the corresponding interface of the linkage control module 62 with wires, and at the same time connect the rated working voltage and current to the metering box to ensure that the metering box is under actual working load. On the operation panel of the linkage control module 62, input the test parameters and start the second sensing module. The second temperature sensor 21 and the second humidity sensor 22 start to collect environmental data of the test chamber in real time to provide a benchmark for subsequent environmental control. If the temperature is greater than the preset value, the linkage control module 62 reduces the heating power of the hot air pump 55. If the temperature is less than the preset value, the linkage control module 62 increases the heating power to ensure the temperature of the test chamber is stable. When the humidity in the test chamber is lower than the current test requirements, the linkage control module 62 controls the solenoid valve 57 to switch to the circulating filter box 58 branch: the air in the test chamber is drawn in by the circulating return air intake head, filtered by the circulating filter box 58, and then enters the hot air pump 55 through the double-headed air duct 56. The air is then transported back to the test chamber with the hot air flow, gradually increasing the humidity. When the second humidity sensor 22 detects that the humidity meets the current test requirements, the circulation filter box 58 branch remains unchanged, and the humidity is kept stable through airflow circulation. If the humidity is higher than the current test requirements, the filter box 59 branch is switched. The air passes through the molecular sieve adsorption block 60 in the moisture-absorbing filter box 59 to remove excess moisture and then flows back until the humidity drops to the test requirement value. Then the linkage control module 62 sends a start command to the motor 45, the motor 45 drives the worm 46 to rotate synchronously, the worm 46 meshes with the worm wheel 44 to drive the worm wheel 44 and the reciprocating wheel 42 fixed therewith to rotate slowly. The eccentric reciprocating protrusion 43 at the top of the reciprocating wheel 42 slides along the reciprocating groove 41 at the bottom of the second push plate 40 as the reciprocating wheel 42 rotates, pushing the second push plate 40 to move reciprocally in the horizontal direction. One end of the second push plate 40 drives the rack 39 to slide in the dry chamber 35 of the brine storage tank 34. The rack 39 meshes with the gear 38, driving the gear 38 and the stirring rod 37 fixed thereto to rotate in the wet chamber 36 of the brine storage tank 34. Multiple stirring rods 37 rotate synchronously to continuously stir the brine mixture in the wet chamber 36, avoid brine stratification, and ensure uniform salt spray concentration in the future. After the brine is stirred evenly, the linkage control module 62 opens the opening and closing valve 26 in the drainage pipe 25, so that the throat of the venturi tube 24 is connected to the wet chamber 36 of the brine storage tank 34, establishing a brine delivery channel. At the same time, the second electric actuator 54 is activated. The output end of the second electric actuator 54 pushes the inverted L-shaped mounting plate 48 to move vertically downward along the lifting slide bar 47, which drives the transmission plate 51 at the bottom of the inverted L-shaped mounting plate 48 to move downward synchronously. Then, after the transmission plate 51 moves down to the designated position, the trapezoidal boss 52 at one end of it rolls into contact with the abutment roller 61 on the first push plate 31 and the second push plate 40. Since the second push plate 40 is still moving back and forth, it drives the abutment roller 61 to push the trapezoidal boss 52, causing the transmission plate 51 to move towards the inverted L-shaped mounting plate 48, squeezing the abutment spring 50 on the outer periphery of the abutment slide rod 49 to deform. When the second push plate 40 moves in the opposite direction, the rebound force of the resisting spring 50 pushes the transmission plate 51 to move in the opposite direction, which in turn drives the first push plate 31 to move back and forth in the horizontal direction. The first push plate 31 drives the conical piston rod 27 to slide axially inside the venturi tube 24, periodically changing the cross-sectional area of ​​the opening at the throat of the venturi tube 24: when the opening narrows, the negative pressure inside the venturi tube 24 increases, and the force of drawing brine from the wet chamber 36 increases. When the opening widens, the negative pressure weakens, and the suction force decreases. This pulse-like change between strong and weak suction causes the brine and the airflow delivered by the hot air pump 55 to mix violently inside the venturi tube 24. The airflow forms a micro vortex, which enhances the atomization effect and finally forms a uniform salt spray. The uniformly atomized salt spray enters the delivery pipeline through the exhaust port 29 of the venturi tube 24, and is then evenly sprayed into the test chamber through the input nozzle 23, where it blends with the temperature and humidity environment of the test chamber to construct a coastal simulated environment of high temperature, high humidity and salt spray.

[0027] The working principle of the temperature rise resistance energy metering box and its temperature rise testing equipment provided by this invention is as follows: First, regarding the temperature rise resistant energy metering box: The core of the temperature rise resistant energy metering box is based on the temperature and humidity parameters inside the box. It automatically switches between internal and external heat dissipation modes through the automatic control module 4 to balance heat dissipation efficiency and moisture-proof performance, and to avoid the wiring terminals from failing due to environmental factors. When the first humidity sensor 3 detects that the humidity of the air entering the main body 1 of the cabinet is high, the first sensing module transmits the detection signal to the automatic control module 4. The automatic control module 4 starts the internal circulation heat dissipation mode: at this time, the first electric push rod 18 in the conversion mechanism remains retracted, the support rod 17 is in a horizontal support state, and drives the inverted U-shaped cover plate 16 to move down to the closed position along the lifting slide 15. Its top covers the external air inlet 13, and the side wall is attached to the external heat dissipation vent 12, forming a sealed space inside the main body 1 of the cabinet, which isolates the external humid air from entering and reduces the oxidation of the wiring terminals. At the same time, the cooling fan 6 starts, generating negative pressure in the air duct 5, drawing hot air from the main body 1 into the air duct 5. The hot air enters the internal circulation cooling chamber 7 through the inner air outlet 8 at the bottom of the air duct 5, and is cooled by the compressed air cooling unit 9. The cooled air is then transported through pipes to the air duct 10 in the middle of the main body 1, and finally flows back into the main body 1 through the inner air outlet 11 at the top of the air duct 10, forming a closed directional circulation airflow, which not only achieves cooling but also prevents moisture intrusion, ensuring the stability of the internal components of the equipment. When the humidity inside the box is low and the temperature rises to the point where enhanced heat dissipation is required, the automatic control module 4 triggers a mode switch; the first electric push rod 18 extends the lifting support rod 17, the support rod 17 rotates around the hinge point at the top of the box body 1, pushing the inverted U-shaped cover plate 16 to move upward along the lifting slide 15, removing the cover of the external air inlet 13 and the external heat dissipation vent 12, and opening the air circulation channel between the box body 1 and the outside. After the cooling fan 6 is started, it generates airflow. External air enters the main body 1 of the cabinet through the external air inlet 13. When passing through the filter screen 14, dust and other impurities are filtered out. The clean air is mixed with the hot air inside the main body 1 and then drawn into the air duct 5. Finally, it is quickly discharged from the external heat dissipation vents 12 on both sides. Through open air circulation, the heat exchange inside the main body 1 is accelerated, excess heat is quickly removed, the heat dissipation efficiency is significantly improved, and the high temperature environment requirements are met. Next, regarding the temperature rise testing equipment: The temperature rise testing equipment, through the linkage of the environmental simulation module and the circulation control module, constructs a complex working condition close to reality for the temperature rise resistant power metering box, and tests its temperature resistance performance. First, the metering box to be tested is fixed in the test chamber of the test box body 20. An electrical connection is established through the interface of the linkage control module 62 to provide the metering box with rated working conditions. At the same time, the second sensing module, namely the second temperature sensor 21 and the second humidity sensor 22, is activated to collect the temperature and humidity data in the test chamber in real time, providing a basis for subsequent environmental control. Then, the hot air pump 55 is started, and the heating function is selected to generate normal temperature or high temperature airflow according to the test requirements. The branch switching of the dual-head air duct 56 is controlled by the solenoid valve 57: if it is necessary to maintain the humidity of the test chamber, the airflow is filtered through the circulating filter box 58 and then flows back to retain the moisture in the chamber; if it is necessary to reduce the humidity, the airflow passes through the moisture absorption filter box 59, removes moisture through the internal molecular sieve adsorption block 60 and then enters the circulation. The switching of the two branches is automatically adjusted by the linkage control module 62 according to the sensing data. Next, the motor 45 of the stirring mechanism is started. The motor 45 drives the worm gear 46 to rotate, which drives the reciprocating wheel 42 to rotate through the worm wheel 44. The eccentric reciprocating cam 43 on the reciprocating wheel 42 slides along the reciprocating groove 41 of the second push plate 40, pushing the second push plate 40 to move back and forth. The second push plate 40 drives the rack 39 to slide in the dry chamber 35, and drives the stirring rod 37 in the wet chamber 36 to rotate through the gear 38, continuously stirring the brine mixture in the brine storage tank 34 to avoid stratification and ensure uniform salt spray concentration. When salt spray needs to be generated, the opening and closing valve 26 of the drainage tube 25 is opened to connect the throat of the venturi tube 24 with the brine storage tank 34. At the same time, the second electric actuator 54 is activated to push the inverted L-shaped mounting plate 48 down along the lifting slide bar 47, which drives the transmission plate 51 to move synchronously. This causes the trapezoidal boss 52 on the transmission plate 51 to contact the abutting roller 61 on the first push plate 31 and the second push plate 40. As the second push plate 40 continues to move back and forth, it drives the abutting roller 61 to push the trapezoidal boss 52, causing the transmission plate 51 to squeeze the abutting spring 50 on the abutting slide bar 49 and deform. With the help of the spring's rebound characteristics, the transmission plate 51 drives the first push plate 31 to move back and forth. The first push plate 31 drives the conical piston rod 27 to slide axially within the venturi tube 24, changing the cross-sectional area of ​​the throat opening and forming a pulse-like negative pressure change: when the opening narrows, the negative pressure increases and the suction force of the brine increases; when the opening widens, the negative pressure weakens and the suction force decreases. This alternating change drives the brine and hot air to mix violently within the venturi tube 24, and the airflow forms a micro-vortex to enhance the atomization effect, allowing the droplets to fully contact the air. The atomized salt mist is then transported through the exhaust port 29 of the venturi tube 24 to the input nozzle 23 and evenly sprayed into the test chamber of the test chamber body 20 to simulate the complex environment of high-humidity salt mist. During the test, the second sensing module continuously feeds back environmental parameters of the test chamber through the second temperature sensor 21 and the second humidity sensor 22. The linkage control module 62 dynamically adjusts the working status of the hot air pump 55, the salt spray generation rate, and the switching of the circulation branch according to the data to ensure that the test environment meets the preset requirements. At the same time, through the electrical connection with the metering box, the operating data of the metering box is collected in real time to evaluate its temperature rise suppression effect under different working conditions and complete the temperature resistance performance test. The specific environment simulation is as follows: Normal temperature and humidity environment: the hot air pump 55 turns off the heating function, the solenoid valve 57 switches to the circulating filter box 58 branch, the salt spray generation system is not started, the test chamber is kept at normal temperature and humidity, and the test metering box is tested under normal operating conditions. High temperature and normal humidity environment: The hot air pump 55 turns on the heating function to increase the airflow temperature to the preset value, and maintains the humidity at the preset value through the circulation branch to test the heat dissipation performance of the metering box under high temperature and low humidity. High temperature and high humidity environment: Keep the hot air pump 55 in heating state, switch the solenoid valve 57 to make the airflow continuously return through the circulating filter box 58, gradually increase the humidity in the chamber to the preset value, and test the metering box's tolerance under combined high temperature and high humidity. Supplementing the wet salt spray environment: Based on high temperature and high humidity, the stirring mechanism and salt spray generation system are activated, and salt spray is continuously and evenly sprayed through the input nozzle 23 to simulate the harsh coastal environment. The test duration is maintained to meet the test requirements in each environmental stage, and the temperature rise and operational stability of the metering chamber are recorded throughout the process.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A temperature-rise resistant power metering box, characterized in that: Includes the main body of the enclosure (1), the heat dissipation module, the first sensing module and the automatic control module (4); The first sensing module includes a first temperature sensor (2) and a first humidity sensor (3) disposed inside the main body (1) of the box, for collecting temperature and humidity parameters inside the box; The heat dissipation module includes an internal circulation heat dissipation unit, an external circulation heat dissipation unit, and a conversion mechanism; The automatic control module (4) is electrically connected to the first sensing module and the heat dissipation module respectively. Based on the detection results of the first temperature sensor (2) and the first humidity sensor (3), the heat dissipation module is controlled to switch between the internal circulation heat dissipation mode and the external circulation heat dissipation mode through the switching mechanism to suppress the temperature rise inside the main body of the box.

2. The temperature rise resistant power metering box according to claim 1, characterized in that: The internal circulation heat dissipation unit includes an air duct (5) symmetrically arranged inside the main body (1) of the box. A heat dissipation fan (6) is installed inside the air duct (5). An internal circulation cooling chamber (7) is installed at the bottom of the main body (1). An internal air vent (8) communicating with the inside of the internal circulation cooling chamber (7) is opened at the bottom of the air duct (5). An air compressor cooling unit (9) is installed inside the internal circulation cooling chamber (7). The input end of the air compressor cooling unit (9) is connected to the inside of the internal air vent (8) through a pipe. An air duct (10) is fixedly connected to the middle section of the main body (1). An internal air outlet (11) is symmetrically opened at the top of the air duct (10). The output end of the air compressor cooling unit (9) is connected to the inside of the air duct (10) through a pipe, forming a directional internal circulation airflow channel of "air intake-cooling-return air".

3. The temperature rise resistant power metering box according to claim 1, characterized in that: The external circulation heat dissipation unit includes external heat dissipation vents (12) symmetrically opened on the side wall of the main body (1). The external heat dissipation vents (12) are connected to the interior of the air duct (5). An external air inlet (13) is opened on the top of the main body (1). A filter screen (14) is fixedly connected inside the external air inlet (13). After the outside air is filtered by the filter screen (14), it enters the main body (1) and mixes with the hot air inside the box. Then it is discharged from the external heat dissipation vents (12) through the air duct (5).

4. The temperature rise resistant power metering box according to claim 3, characterized in that: The conversion mechanism includes lifting slides (15) symmetrically opened on the side wall of the main body (1) of the box. Inverted U-shaped cover plates (16) are slidably arranged inside the two lifting slides (15). Support rods (17) are symmetrically hinged to the top of the main body (1). The top of the support rods (17) abuts against the inverted U-shaped cover plates (16). The top of the main body (1) is symmetrically hinged to the top of the box. The output end of the first electric push rod (18) is hinged to the middle section of the support rod (17). The first electric push rod (18) drives the support rod (17) to lift and lower, causing the inverted U-shaped cover plates (16) to slide along the lifting slides (15) to realize the opening and closing of the external heat dissipation vent (12). When the inverted U-shaped cover plates (16) are closed, they switch to internal circulation, and when they are open, they switch to external circulation.

5. A temperature rise testing device for testing the temperature rise resistant energy metering box as described in any one of claims 1 to 4, characterized in that: It includes the main body of the test box (20), the environmental simulation module, the cyclic control module, the second sensing module and the linkage control module (62); The test chamber body (20) is provided with a test chamber and an equipment installation chamber inside. The second sensing module includes a second temperature sensor (21) and a second humidity sensor (22) located in the test chamber inside the test chamber body (20). The environmental simulation module includes a brine storage tank (34), a stirring mechanism and a Venturi atomizing structure. The Venturi atomizing structure is used to atomize the brine mixture in the brine storage tank (34) to form salt mist and input it into the interior of the test chamber body (20). The circulation control module includes an input nozzle (23) and a circulation return suction head diagonally arranged inside the test chamber. The circulation return suction head includes a circulation branch and a moisture absorption branch, and the two branches can be switched. The linkage control module (62) is electrically connected to the environmental simulation module and the circulation control module respectively, controls the stirring mechanism and the Venturi atomizing structure to work together, and adjusts the working mode of the circulation control module based on the detection results of the sensing module.

6. The temperature rise testing equipment according to claim 5, characterized in that: The Venturi atomizing structure includes a Venturi tube (24) installed inside the equipment installation chamber. The Venturi tube (24) contains a tapered inlet section, a throat, and a tapered diffuser section. The Venturi tube (24) is equipped with a throat adjustment unit. The throat adjustment unit includes a conical piston rod (27) installed inside the Venturi tube (24) that slides axially back and forth to change the cross-sectional area of ​​its throat opening and form a pulsed negative pressure change.

7. The temperature rise testing equipment according to claim 6, characterized in that: The throat adjustment unit also includes a drainage pipe (25) disposed at the throat of the venturi tube (24) and connected to the bottom of the saline storage tank (34), and an opening and closing valve (26) is provided inside the drainage pipe (25). The Venturi tube (24) has an air inlet (28) and an exhaust port (29) at both ends. The exhaust port (29) is connected to the input nozzle (23) through a pipe. One end of the conical piston rod (27) passes through the Venturi tube (24) and is fixedly connected to the first push plate (31). A bellows (30) is fixedly sleeved on the outer periphery of the conical piston rod (27). The other end of the bellows (30) is fixedly sleeved on the outer periphery of the connection end between the conical piston rod (27) and the Venturi tube (24) for sealing and preventing leakage. One end of the first push plate (31) is fixedly connected to a flow guide rod (32), which is slidably connected to the inner wall of the test box body (20). A reset spring (33) is sleeved on the outer periphery of the flow guide rod (32), and the reset spring (33) is located between the first push plate (31) and the test box body (20).

8. The temperature rise testing equipment according to claim 7, characterized in that: The stirring mechanism includes a dry chamber (35) and a wet chamber (36) located inside the brine storage tank (34). Multiple stirring rods (37) are symmetrically and uniformly connected inside the wet chamber (36). The top of the stirring rod (37) extends into the interior of the dry chamber (35) and is fixedly connected to a gear (38). A rack (39) is symmetrically slidably arranged inside the dry chamber (35). One end of the rack (39) passes through the brine storage tank (34) and is fixedly connected to a second push plate (40). The bottom of the second push plate (40) is provided with a reciprocating slide groove (41). The equipment installation compartment of the test box body (20) is rotatably connected to a reciprocating wheel (42). The top of the reciprocating wheel (42) is eccentrically rotatably connected to a reciprocating protrusion (43). The reciprocating protrusion (43) is located inside the reciprocating slide groove (41). One end of the reciprocating wheel (42) is fixedly connected to a worm gear (44). The equipment installation compartment of the test box body (20) is fixedly connected to a motor (45). The output end of the motor (45) is fixedly connected to a worm (46) that meshes with the worm gear (44).

9. The temperature rise testing equipment according to claim 8, characterized in that: A transmission mechanism is provided between the stirring mechanism and the throat adjustment unit. The transmission mechanism includes a lifting slide rod (47) that is slidably disposed inside the equipment installation compartment of the test box body (20). An inverted L-shaped mounting plate (48) is fixedly connected to the bottom of the lifting slide rod (47). The test box body (20) is fixedly connected to the equipment installation compartment with a second electric push rod (54). The output end of the second electric push rod (54) is fixedly connected to the top of the inverted L-shaped mounting plate (48). A pair of abutting slide rods (49) are slidably connected inside the inverted L-shaped mounting plate (48). A transmission plate (51) is fixedly connected to one end of the two abutting slide rods (49). Abutting springs (50) are sleeved on the outer periphery of the abutting slide rods (49). The abutting springs (50) are located between the transmission plate (51) and the inverted L-shaped mounting plate (48). One end of the transmission plate (51) is provided with a pair of trapezoidal bosses (52) and an unlocking platform (53) in an alternating manner. One end of the first push plate (31) and the second push plate (40) are rotatably connected with a contact roller (61) that rolls against the trapezoidal bosses (52) and the unlocking platform (53).

10. The temperature rise testing equipment according to claim 5, characterized in that: A hot air pump (55) is fixedly connected inside the equipment installation compartment of the test chamber body (20). The output end of the hot air pump (55) is fixedly connected to the air inlet (28) through a pipe. A double-headed air duct (56) is fixedly connected to the input end of the hot air pump (55). A circulating filter box (58) and a moisture-absorbing filter box (59) are respectively installed inside the test chamber of the test chamber body (20). The two input ends of the double-headed air duct (56) are respectively connected to the circulating filter box (58) and the moisture-absorbing filter box (59). Furthermore, both input ends of the double-headed air duct (56) are equipped with solenoid valves (57). The circulation branch is connected to the double-headed air duct (56) and the hot air pump (55) via the circulation filter box (58). The moisture absorption branch is connected to the double-headed air duct (56) and the hot air pump (55) via the moisture absorption filter box (59). The moisture absorption branch also includes a molecular sieve adsorption block (60) installed inside the moisture absorption filter box (59). After the circulating return air intake head draws in the gas in the test chamber, it is processed by the corresponding branch and then returned to the test chamber.

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