Anti-condensation device and method for outdoor power distribution cabinet

Abstract

The invention discloses an outdoor power distribution cabinet anti-condensation device and method, and relates to the technical field of outdoor power distribution. The hollow ball is located in the middle of the first cabinet body chamber; a first rotating motor and a telescopic air cylinder are arranged at the upper end and the lower end of the first cabinet body correspondingly, and output shafts of the first rotating motor and the telescopic air cylinder are coaxially arranged and connected to the upper end and the lower end of the hollow ball correspondingly; the hollow ball is provided with an air exhaust assembly, the air exhaust assembly is used for sucking dry hot air, the output end of the air exhaust assembly is connected with a spray pipe through a hose, and one end of the spray pipe extends out through a through hole in the side wall of the hollow ball; a plurality of humidity sensors are evenly distributed on the inner side of the first cabinet body in the circumferential direction. By adopting the scheme, in the process of introducing dry hot air to remove condensation, an area with relatively high humidity can be eliminated at a fixed point, so that the condensation removal efficiency is improved, and the risks of cable head fault, power failure and corrosion of internal parts are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of outdoor power distribution, and in particular to an anti-condensation device and method for an outdoor power distribution cabinet. Background Art

[0002] Traditional outdoor power distribution cabinets often cause serious condensation problems inside the cabinets due to improper design. This phenomenon is particularly prominent in areas with high humidity and large temperature differences between day and night, which can easily cause cable head failures and power outages, seriously affecting equipment operation safety and power supply reliability; and excessive condensation can easily cause rust on internal parts.

[0003] Traditional anti-condensation methods mainly include condenser dehumidification, heater heating evaporation and ventilation dilution. However, even if the above methods are combined to remove internal condensation, it takes a long time to completely remove it. In this process, the risk of cable head failure, power outage and internal parts corrosion is increased. Summary of the invention

[0004] The present invention aims to solve the deficiencies of the prior art and to provide an anti-condensation device and method for an outdoor distribution cabinet. By adopting this scheme, during the process of introducing dry hot air to remove condensation, areas with heavy humidity can be eliminated at fixed points, thereby improving the decondensation efficiency and reducing the risks of cable head failure, power outages and rust of internal parts.

[0005] The present invention is achieved through the following technical solutions:

[0006] An outdoor power distribution cabinet anti-condensation device, comprising:

[0007] A first cabinet, wherein the first cabinet is provided with a dry hot air inlet and an air outlet;

[0008] A hollow ball, the hollow ball is located in the middle of the first cabinet chamber; the first cabinet is provided with a first rotating motor and a telescopic cylinder at the upper and lower ends respectively, and the output shafts of the first rotating motor and the telescopic cylinder are coaxially arranged and respectively connected to the upper and lower ends of the hollow ball;

[0009] The output shaft of the first rotating motor is fixedly connected to the hollow ball through a telescopic rod and is used to drive the hollow ball to rotate;

[0010] The output shaft end of the telescopic cylinder is rotatably connected to the hollow ball, and the hollow ball can rotate around the output shaft axis of the telescopic cylinder;

[0011] The hollow ball is provided with an air extraction component, which is used to extract dry hot air, and the output end of the air extraction component is connected to a nozzle through a hose, and one end of the nozzle extends through a through hole on the side wall of the hollow ball;

[0012] A plurality of humidity sensors are evenly distributed around the inner side of the first cabinet.

[0013] Compared with the prior art, which requires a long time to completely remove the condensation, and in this process, increases the risk of cable head failure, power outages, and rust of internal parts. The present invention provides an anti-condensation device for an outdoor distribution cabinet. By adopting this solution, during the process of removing condensation by introducing dry hot air, areas with heavy humidity can be eliminated at specific points, thereby improving the condensation removal efficiency and reducing the risk of cable head failure, power outages, and rust of internal parts. In the specific scheme, it includes a first cabinet, and each electrical accessory is installed on the inner wall of the first cabinet; the hollow ball is arranged in the middle of the first cabinet so as to move up and down in the gap; the first cabinet is provided with a first rotating motor and a telescopic cylinder at the upper and lower ends respectively, the output shaft of the first rotating motor is connected to the telescopic rod, and is connected to the upper end of the hollow ball through the telescopic rod, so that the hollow ball can be driven to rotate by driving the first rotating motor to adjust the horizontal position of the nozzle, while the telescopic rod can only be freely extended up and down to adapt to the height adjustment of the hollow ball; the output end of the telescopic cylinder is rotatably connected to the lower end of the hollow ball, so as to adjust the height position of the nozzle and adapt to the rotation of the hollow ball; therefore, through the movement of two axes, it is convenient to quickly adjust the nozzle to the corresponding high humidity area; there is also an exhaust component in the hollow ball, through which part of the dry gas in the first cabinet can be extracted, and it is ejected at a high flow rate through the nozzle, so as to dehumidify the high humidity area at a fixed point, thereby avoiding the generation of condensation or quickly evaporating the newly formed condensation, and improving the decondensation efficiency. The nozzle is preferably a Rafael tube. Under normal operation, external gas can enter through the bottom pipe and be discharged through the top pipe.

[0014] Since there are many electrical accessories inside the first cabinet, a high humidity area is likely to be blocked by a component, resulting in the nozzle being unable to aim at the area for gas spraying. Therefore, in order to further adjust the spray angle of the nozzle to partially or completely avoid obstacles, a sealing sleeve is provided on the outside of the other through hole of the hollow ball, and one end of the nozzle extends into the inside of the sealing sleeve and passes through the small diameter end of the sealing sleeve; the large diameter end of the sealing sleeve is connected to the other through hole of the hollow ball;

[0015] The hollow ball is also provided with an angle adjustment component inside, and the angle adjustment component is used to drive the other end of the nozzle to deviate circumferentially;

[0016] The angle adjustment assembly comprises a circular ring, which is fixed inside the hollow sphere; at least three telescopic driving members are evenly distributed on the inner side surface of the circular ring in the circumferential direction, and the output ends of all the telescopic driving members are connected to the outer side wall of the nozzle;

[0017] The fixed end and the output end of the telescopic driving member are respectively connected to the inner side of the ring and the outer side of the nozzle through a ball joint.

[0018] In this scheme, the sealing sleeve is a bellows structure, which has a certain rigidity to achieve support, and its flexibility and elasticity can facilitate the adjustment of the nozzle angle; one end of the nozzle is connected to the small diameter end of the sealing sleeve and passes through the small diameter end of the sealing sleeve; the other end of the nozzle is located inside the hollow sphere and passes through the inside of the ring; the telescopic drive member can be an air cylinder or an oil cylinder, and the fixed end and the output end of the telescopic drive member are connected by a ball joint to adapt to the multi-directional adjustment of the angle; the extension length of a number of telescopic drives is electrically controlled to achieve the change of the nozzle tilt angle, thereby avoiding obstacles.

[0019] As a specific connection method of the upper and lower ends of the hollow ball, the end of the telescopic rod away from the first rotating motor is provided with a ball cover, the ball cover and the outer diameter of the hollow ball are adapted to each other, and are closely attached to the outer wall of the hollow ball; the ball cover and the hollow ball are connected by bolts;

[0020] The output shaft end of the telescopic cylinder is rotatably connected to the hollow ball. In this solution, by providing a ball cover, it is convenient to quickly connect the hollow ball and improve stability during the adjustment of the hollow ball; the output shaft end of the telescopic cylinder is rotatably connected to the lower end of the hollow ball, which can adapt to the rotation of the hollow ball itself.

[0021] In order to provide dry hot air, the device further comprises a second cabinet, which is arranged in sequence with the first cabinet from outside to inside; and further comprises an air cooler and an air heater located outside the second cabinet, wherein the output end of the air cooler and the air heater are connected to the bottom of the second cabinet through a pipeline;

[0022] The second cabinet has a bearing plate inside, and the first cabinet is placed on the bearing plate; the bearing plate is provided with a plurality of first vents, and the bottom of the second cabinet is connected to the first cabinet through the plurality of first vents. In this solution, when it is necessary to input dry hot air into the first cabinet, the first induced draft fan is first started to generate negative pressure inside the first cabinet, and the air first enters the air condenser, which condenses the outside air to condense a large amount of water in the air and discharge the water in the air. Then the cold air enters the air heater, thereby heating the cold air to form dry hot air, and the hot air is evenly discharged into the first cabinet through a plurality of first through holes to discharge the moisture inside the first cabinet, and to perform auxiliary heat drying on the area with heavier moisture to evaporate the condensation. Of course, a third induced draft fan can also be provided at the input end of the air cooler to increase the flow rate.

[0023] Since the existing exhaust fan has a large suction force, it is very likely to suck in most of the dry gas in the first cabinet during the suction process, thereby affecting the uniform distribution of the dry gas inside the first cabinet, and even evacuating a certain area, resulting in reduced drying effect. Therefore, in order to avoid excessive suction force, it is configured as follows: the exhaust assembly includes a telescopic hose, a conical tube, a vertical tube and a compression chamber, the lower end of the telescopic hose is connected to the bearing plate, and part of the first vent is connected to the telescopic hose; the large-diameter end at the bottom of the conical tube is connected to the upper end of the telescopic hose, and the small-diameter end at the top of the conical tube is rotatably sleeved on the vertical tube, and the vertical tube can rotate around its own axis; the large-diameter end of the conical tube is provided with a grid plate, and the output shaft end of the telescopic cylinder is fixedly connected to the grid plate;

[0024] The upper end of the vertical tube penetrates into the hollow ball from the lower end of the hollow ball and is connected to the compression chamber; a rotating shaft is coaxially arranged inside the vertical tube, and a spiral blade is sleeved on the rotating shaft, and the outer diameter of the spiral blade is adapted to the inner diameter of the vertical tube; a third rotating motor is also fixed outside the lower end of the vertical tube, and the third rotating motor is used to drive the rotating shaft to rotate, and the upper end of the rotating shaft is rotatably connected to the compression chamber; the compression chamber is fixedly connected to the inside of the hollow ball; the pitch of the spiral blade gradually decreases toward the compression chamber;

[0025] The lower end side wall of the vertical pipe is provided with an air inlet, and the side wall of the compression chamber is provided with a back pressure hole connected to the interior of the compression chamber and the upper end of the vertical pipe; the side wall of the compression chamber is also provided with an air outlet, and the air outlet is provided with an electric control valve, and the output end of the electric control valve is connected to the nozzle through a hose.

[0026] In this solution, the telescopic hose itself has a variable length to adapt to the lifting and lowering of the upper vertical pipe and the hollow ball; the upper end of the telescopic hose is connected to the conical tube, and a mesh plate is provided at the large-diameter end of the bottom of the conical tube. The mesh plate facilitates the passage of gas while facilitating the connection of the output end of the telescopic cylinder, thereby adapting to the lifting and lowering of the hollow ball; in addition, the design of the conical tube can facilitate the dry hot gas to gradually converge to the small-diameter end and the air inlet on the side wall of the lower end of the vertical tube; a third rotating motor is fixed to the outside of the lower end of the vertical tube to drive the rotating shaft and the spiral blades to rotate; when the dry hot gas enters the vertical tube through the air inlet, the dry hot gas is gradually transported to the compression chamber through the spiral blades, and the pitch of the spiral blades gradually decreases toward the compression chamber, which can also increase the gas pressure; when the compression chamber is compressed to enough gas, the electric control valve is opened at this time, and the internal compressed gas can be injected into the nozzle through the hose. The above scheme receives the dry hot air in the middle of the carrier plate through the telescopic hose, so as not to affect the input of the surrounding dry hot air into the first cabinet, and thus not to affect the uniformity of the dry gas at the peripheral position of the first cabinet, so as to achieve evaporation and drying of the condensation on the surrounding electrical components. In addition, a structure similar to an auger conveyor is formed by vertical pipes, spiral blades, etc., which can not only increase the gas pressure, but also increase the gas flow rate, and by increasing the pressure, it is used to compensate for the heat lost by the dry hot gas during the transportation process.

[0027] In order to increase the output gas pressure inside the compression chamber and thus improve the gas flow rate, the pumping assembly further includes a push cylinder, which is fixed to the outer side wall of the hollow ball;

[0028] The compression chamber is linearly arranged; a piston of matching size is provided inside the compression chamber, and the output end of the push cylinder extends into the hollow ball and is connected to the piston in the compression chamber. In this scheme, the compression chamber can be square-cylindrical, with a slidably connected piston inside it, and under the compression of the push cylinder, the gas inside the compression chamber can be squeezed into the nozzle.

[0029] Since the air condenser can only remove most of the moisture in the air, and water vapor is inevitably generated during the air heater heating the air, the water vapor is not easy to be discharged and will be mixed in the hot air and enter the distribution cabinet, resulting in more water vapor inside the distribution cabinet. Therefore, in order to discharge the water vapor, a chamber is left between the bearing plate and the bottom of the second cabinet; the chamber is filled with sponge; the pipe end on the output end of the air heater has a bell mouth, and the bell mouth is connected to the inside of the chamber. In this scheme, the heated gas is preferably entered into the sponge, and the sponge absorbs as much water vapor in the air as possible. In this way, the water vapor can be discharged, and the dry hot air can enter the first cabinet to reduce the moisture content in the air as much as possible and improve the efficiency of discharging condensation inside the distribution cabinet.

[0030] In order to realize the reuse of the sponge strip, the chamber is also provided with a horizontal pressing plate, and the horizontal pressing plate is located above the sponge;

[0031] A second rotary motor is also provided on the outside of the second cabinet, and the output shaft of the second rotary motor extends into the chamber and is threadedly connected to the horizontal pressing plate. The second rotary motor is used to drive the horizontal pressing plate to rise and fall. The chamber is also provided with a guide rod slidably connected to the horizontal pressing plate, and the guide rod is parallel to the output shaft of the second rotary motor;

[0032] The horizontal pressing plate is provided with a plurality of second vents. In this solution, a second rotary motor can be provided on each side of the bottom of the second cabinet, and the output shaft of the second rotary motor rotates and extends into the chamber, and is threadedly connected to the horizontal pressing plate. In this way, the two second rotary motors rotate synchronously, and under the limit of the guide rod, the horizontal pressing plate is driven to move up and down. During the downward movement of the horizontal pressing plate, the sponge can be gradually squeezed downward, thereby squeezing out the water in the sponge, so that the discharged water falls into the bell mouth and is discharged. The horizontal pressing plate is provided with a plurality of second vents to facilitate the passage of dry hot air, and the surface of the horizontal pressing plate can be formed into a smooth surface using a water-resistant material.

[0033] In order to facilitate the installation of the telescopic cylinder and to seal and protect it, an installation box is provided in the middle of the chamber, the telescopic cylinder is located in the installation box, and the output end of the telescopic cylinder passes through the bearing plate and extends into the first cabinet; the sponge and the horizontal pressure plate are both arranged around the installation box.

[0034] In order to facilitate the discharge of the squeezed excess water, a vertical pipe is connected to the small-diameter end of the bottom of the bell mouth, and a valve is provided at the lower end of the vertical pipe; an inclined pipe is connected to the side wall of the vertical pipe, the lower end of the inclined pipe is connected to the side wall of the vertical pipe, and the upper end of the inclined pipe is connected to the air heater through a pipeline.

[0035] In order to further isolate the external temperature and reduce the formation of condensation, a gap is left between the first cabinet and the second cabinet, and the gap is filled with a thermal insulation material;

[0036] The plurality of humidity sensors are sequentially distributed in a rectangular array along the longitudinal depth direction of the first cabinet;

[0037] Several humidity sensors are placed in the insulation material, and probes of several humidity sensors are located inside the first cabinet. Some of them are distributed in a matrix array, arranged along the two sides and top of the first cabinet to form a rectangle; by arranging several matrices in sequence, a three-dimensional humidity field in the circumferential area inside the first cabinet can be formed at the remote control end, achieving full circumferential coverage humidity detection to avoid missed detection.

[0038] In a further embodiment, the present invention provides an anti-condensation method for an outdoor power distribution cabinet anti-condensation device, comprising the following steps:

[0039] S1: Performing regional coverage humidity detection on the circumferential area inside the first cabinet through a plurality of humidity sensors to establish a three-dimensional humidity field;

[0040] S2: when it is detected that the humidity of at least one area inside the first cabinet is higher than a first threshold, dry hot air is passed through a dry hot air inlet on the first cabinet;

[0041] S3: sequentially locate the coordinates of several areas where the humidity is higher than the first threshold, control the hollow ball to move to a position facing one of the areas, and rotate the hollow ball to aim the nozzle at the area;

[0042] S21: The nozzle is also provided with an obstacle detection sensor. When the obstacle detection sensor detects that there is an obstacle between the nozzle and the area, the first rotating motor and the telescopic cylinder are controlled to adjust the position of the hollow ball, and the angle adjustment component is synchronously controlled to adjust the inclination angle of the nozzle until the nozzle axis passes over the obstacle;

[0043] S3: After the hollow ball is adjusted, the extraction component is started to extract part of the dry hot air, and the dry hot air is ejected through the nozzle, so as to evaporate the condensation in all areas where the humidity is higher than the first threshold in turn.

[0044] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0045] 1. The present invention provides an anti-condensation device and method for an outdoor power distribution cabinet. By adopting this scheme, in the process of removing condensation by introducing dry hot air, areas with heavy humidity can be eliminated at fixed points, thereby improving the decondensation efficiency and reducing the risks of cable head failure, power outages, and rusting of internal parts.

[0046] 2. The present invention provides an anti-condensation device for an outdoor power distribution cabinet and a method thereof. According to this solution, the fixed end and the output end of the telescopic drive member are connected by a ball joint to adapt to the multi-directional adjustment of the angle; the extension length of a plurality of telescopic drive members is electrically controlled to realize the change of the inclination angle of the nozzle, thereby avoiding obstacles.

[0047] 3. The present invention provides an anti-condensation device and method for an outdoor distribution cabinet. According to this scheme, air first enters an air condenser, which condenses the outside air to condense a large amount of water in the air and discharges the water in the air. Then, the cold air enters the air heater, thereby heating the cold air to form dry hot air, which is evenly discharged into the first cabinet through a plurality of first through holes to discharge the moisture inside the first cabinet, and performs auxiliary heat drying on the area with heavier moisture to evaporate the condensation.

[0048] 4. The present invention provides an outdoor power distribution cabinet anti-condensation device and method. With this solution, the sponge is used to absorb water vapor in the air as much as possible, so that the water vapor can be discharged, and dry hot air can enter the first cabinet to reduce the moisture content in the air as much as possible, and improve the efficiency of discharging condensation inside the power distribution cabinet. In addition, the horizontal pressure plate can move up and down, thereby gradually squeezing the sponge downward, thereby squeezing out the water in the sponge, and causing the discharged water to fall into the bell mouth and be discharged.

[0049] 5. The present invention provides an anti-condensation device and method for an outdoor power distribution cabinet. By adopting this scheme, a three-dimensional humidity field is formed in the circumferential area inside the first cabinet at the remote control end, realizing circumferential full coverage humidity detection. In this way, anti-condensation operation can be performed remotely with a high degree of automation.

[0050] 6. The present invention provides an outdoor power distribution cabinet anti-condensation device and method thereof. With this solution, by setting up the exhaust assembly, the dry hot air in the middle of the load-bearing plate is received through the telescopic hose, so as not to affect the input of the surrounding dry hot air into the first cabinet, and thus not to affect the uniformity of the dry gas at the peripheral position of the first cabinet, so as to facilitate the evaporation and drying of the condensation on the surrounding electrical components. In addition, by forming a structure similar to an auger conveyor through vertical pipes, spiral blades, etc., not only the gas pressure can be increased, but also the gas flow rate can be increased, and by increasing the pressure, it is used to compensate for the heat lost by the dry hot air during the transportation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0052] Figure 1 A schematic structural diagram of an outdoor power distribution cabinet anti-condensation device provided by the present invention;

[0053] Figure 2 A schematic diagram of the internal structure of a first cabinet provided by the present invention;

[0054] Figure 3 A schematic diagram of the internal structure of the hollow sphere provided by the present invention;

[0055] Figure 4 A schematic diagram of the structure of the angle adjustment assembly provided by the present invention;

[0056] Figure 5 This is a schematic diagram of the bottom structure of the tapered tube provided by the present invention.

[0057] Marks and corresponding parts names in the attached drawings:

[0058] 1-first cabinet, 101-first induced draft fan, 2-hollow ball, 202-nozzle, 3-first rotating motor, 4-telescopic cylinder, 5-telescopic rod, 6-humidity sensor, 7-sealing sleeve, 8-angle adjustment component, 801-ring, 802-telescopic drive member, 803-ball joint, 9-second cabinet, 901-carrying plate, 902-second rotating motor, 903-sponge, 904-bell mouth, 905-horizontal pressure plate, 906-vertical Tube, 907-valve, 908-inclined tube, 10-insulation material, 11-air cooler, 12-air heater, 13-third induced draft fan, 14-exhaust assembly, 1401-telescopic hose, 1402-conical tube, 14021-grid plate, 1403-vertical tube, 1404-spiral blade, 1405-compression chamber, 1406-electrically controlled valve, 1407-third rotating motor, 1408-push cylinder, 1409-piston. DETAILED DESCRIPTION

[0059] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0060] Embodiment 1:

[0061] This embodiment 1 provides an outdoor power distribution cabinet anti-condensation device, such as Figure 1-Figure 5 As shown, including:

[0062] A first cabinet 1, wherein the first cabinet 1 is provided with a dry hot air inlet and an air outlet;

[0063] A hollow ball 2, the hollow ball 2 is located in the middle of the chamber of the first cabinet 1; the first cabinet 1 is provided with a first rotating motor 3 and a telescopic cylinder 4 at the upper and lower ends respectively, and the output shafts of the first rotating motor 3 and the telescopic cylinder 4 are coaxially arranged and respectively connected to the upper and lower ends of the hollow ball 2;

[0064] The output shaft of the first rotating motor 3 is fixedly connected to the hollow ball 2 through a telescopic rod 5, and is used to drive the hollow ball 2 to rotate;

[0065] The output shaft end of the telescopic cylinder 4 is rotatably connected to the hollow ball 2, and the hollow ball 2 can rotate around the output shaft axis of the telescopic cylinder 4;

[0066] The hollow ball 2 is provided with an air extraction component 14, which is used to extract dry hot air. The output end of the air extraction component 14 is connected to a nozzle 202 through a hose, and one end of the nozzle 202 extends through a through hole on the side wall of the hollow ball 2.

[0067] A plurality of humidity sensors 6 are evenly distributed around the inner side of the first cabinet 1 .

[0068] Compared with the prior art, it takes a long time to completely remove the condensation. In this process, the risks of cable head failure, power outage and rust of internal parts are increased. The present invention provides an anti-condensation device for an outdoor power distribution cabinet. With this solution, when dry hot air is introduced to remove condensation, the area with heavy humidity can be eliminated at a fixed point, thereby improving the efficiency of condensation removal and reducing the risks of cable head failure, power outage and rust of internal parts. In the specific solution, it includes a first cabinet 1, and each electrical accessory is installed on the inner wall of the first cabinet 1; the hollow ball 2 is arranged in the middle of the first cabinet 1 to facilitate up and down movement in the gap; the first cabinet 1 is provided with a first rotating motor 3 and a telescopic cylinder 4 at the upper and lower ends respectively, and the output shaft of the first rotating motor 3 is connected to the telescopic rod 5, and is connected to the upper end of the hollow ball 2 through the telescopic rod 5. In this way, by driving the first rotating motor 3, the hollow ball 2 can be driven to rotate to adjust the horizontal position of the nozzle 202, and the telescopic rod 5 can only be freely extended and retracted up and down to adapt to the hollow ball. 2 height adjustment; the output end of the telescopic cylinder 4 is rotatably connected to the lower end of the hollow ball 2, so as to adjust the height position of the nozzle 202 and adapt to the rotation of the hollow ball 2; therefore, by moving the two axes, it is convenient to quickly adjust the nozzle 202 to the corresponding high humidity area; there is also an exhaust component 14 in the hollow ball 2, through which part of the dry gas in the first cabinet 1 can be extracted, and sprayed out at a high flow rate through the nozzle 202, so as to dehumidify the high humidity area at a fixed point, thereby avoiding the generation of condensation or quickly evaporating the newly formed condensation, and improving the decondensation efficiency. The nozzle 202 is preferably a Rafale tube. Under normal operation, external gas can enter through the bottom pipe and be discharged through the top pipe.

[0069] Since there are many electrical accessories inside the first cabinet 1, a high humidity area may be blocked by a component, resulting in the nozzle 202 being unable to aim at the area for gas spraying. Therefore, in order to further adjust the spray angle of the nozzle 202 to partially or completely avoid obstacles, a sealing sleeve 7 is provided on the outside of another through hole of the hollow ball 2, and one end of the nozzle 202 extends into the inside of the sealing sleeve 7 and passes through the small diameter end of the sealing sleeve 7; the large diameter end of the sealing sleeve 7 is connected to another through hole of the hollow ball 2;

[0070] The hollow ball 2 is also provided with an angle adjustment component 8, and the angle adjustment component 8 is used to drive the other end of the nozzle 202 to deviate circumferentially;

[0071] The angle adjustment assembly 8 includes a circular ring 801, which is fixed inside the hollow ball 2; at least three telescopic driving members 802 are evenly distributed on the inner side surface of the circular ring 801 in the circumferential direction, and the output ends of all the telescopic driving members 802 are connected to the outer side wall of the nozzle 202;

[0072] The fixed end and the output end of the telescopic driving member 802 are respectively connected to the inner side of the ring 801 and the outer side of the nozzle 202 through a ball joint 803 .

[0073] In the present solution, the sealing sleeve 7 is a bellows structure, which has a certain rigidity to achieve support, and its flexibility and elasticity can facilitate the adjustment of the angle of the nozzle 202; one end of the nozzle 202 is connected to the small diameter end of the sealing sleeve 7 and passes through the small diameter end of the sealing sleeve 7; and the other end of the nozzle 202 is located inside the hollow ball 2 and passes through the inside of the ring 801; the telescopic drive member 802 can be an air cylinder or an oil cylinder, and the fixed end and the output end of the telescopic drive member 802 are connected by a ball joint 803 to adapt to the multi-directional adjustment of the angle; the extension length of a number of telescopic drives 802 is electrically controlled to achieve the change of the inclination angle of the nozzle 202, thereby avoiding obstacles.

[0074] As a specific connection method of the upper and lower ends of the hollow ball 2, the end of the telescopic rod 5 away from the first rotating motor 3 is provided with a ball cover, the ball cover and the outer diameter of the hollow ball 2 are adapted to each other, and are closely attached to the outer wall of the hollow ball 2; the ball cover and the hollow ball 2 are connected by bolts;

[0075] The output shaft end of the telescopic cylinder 4 is rotatably connected to the hollow ball 2. In this solution, by providing a ball cover, it is convenient to quickly connect the hollow ball 2 and improve stability during the adjustment of the hollow ball 2; the output shaft end of the telescopic cylinder 4 is rotatably connected to the lower end of the hollow ball 2, which can adapt to the rotation of the hollow ball 2 itself.

[0076] In order to facilitate the provision of dry hot air, a second cabinet 9 is further included, and the second cabinet 9 and the first cabinet 1 are arranged in sequence from the outside to the inside; an air cooler 11 and an air heater 12 are further included on the outside of the second cabinet 9, and the output end of the air cooler 11 and the air heater 12 are connected to the bottom of the second cabinet 9 through a pipeline;

[0077] The second cabinet 9 has a bearing plate 901 inside, and the first cabinet 1 is placed on the bearing plate 901; the bearing plate 901 is provided with a plurality of first vents, and the bottom of the second cabinet 9 is connected to the inside of the first cabinet 1 through the plurality of first vents. In this solution, when it is necessary to input dry hot air into the first cabinet 1, the first induced draft fan 101 is first started to generate negative pressure inside the first cabinet 1, and the air first enters the air condenser, which condenses the outside air, condenses a large amount of water in the air, and discharges the water in the air. Then the cold air enters the air heater 12, thereby heating the cold air to form dry hot air, and evenly discharges it into the first cabinet 1 through a plurality of first through holes to discharge the moisture inside the first cabinet 1, and perform auxiliary heat drying on the area with heavier moisture to evaporate the condensation. Of course, a third induced draft fan 13 can also be set at the input end of the air cooler 11 to increase the flow rate.

[0078] Since the existing exhaust fan has a large suction force, during the suction process, it is very likely to suck in most of the dry gas in the first cabinet 1, thereby affecting the uniform distribution of the dry gas inside the first cabinet 1, and even evacuating a certain area, resulting in reduced drying effect. Therefore, in order to avoid excessive suction force, it is configured as follows: the exhaust component 14 includes a telescopic hose 1401, a conical tube 1402, a vertical tube 906 and a compression chamber 1405, the lower end of the telescopic hose 1401 is connected to the bearing plate 901, and part of the first vent is connected to the telescopic hose 1401; the large-diameter end at the bottom of the conical tube 1402 is connected to the upper end of the telescopic hose 1401, and the small-diameter end at the top of the conical tube 1402 is rotatably sleeved on the vertical tube 906, and the vertical tube 906 can rotate around its own axis; the large-diameter end of the conical tube 1402 is provided with a grid plate 14021, and the output shaft end of the telescopic cylinder 4 is fixedly connected to the grid plate 14021;

[0079] The upper end of the vertical tube 906 penetrates into the hollow ball 2 from the lower end of the hollow ball 2 and is connected to the compression chamber 1405; a rotating shaft is coaxially arranged inside the vertical tube 906, and a spiral blade 1404 is sleeved on the rotating shaft, and the outer diameter of the spiral blade 1404 is adapted to the inner diameter of the vertical tube 906; a third rotating motor 1407 is also fixed outside the lower end of the vertical tube 906, and the third rotating motor 1407 is used to drive the rotating shaft to rotate, and the upper end of the rotating shaft is rotatably connected to the compression chamber 1405; the compression chamber 1405 is fixedly connected to the inside of the hollow ball 2; the pitch of the spiral blade 1404 gradually decreases toward the compression chamber 1405;

[0080] The lower side wall of the vertical pipe 906 has an air inlet, and the side wall of the compression chamber 1405 has a back pressure hole connected to its own interior and the upper end of the vertical pipe 906; the side wall of the compression chamber 1405 also has an air outlet, and the air outlet is provided with an electric control valve 1406, and the output end of the electric control valve 1406 is connected to the nozzle 202 through a hose.

[0081] In this solution, the telescopic hose 1401 itself has a variable length to adapt to the lifting and lowering of the upper vertical pipe 906 and the hollow ball 2; the upper end of the telescopic hose 1401 is connected to the conical tube 1402, and the large-diameter end of the bottom of the conical tube 1402 is provided with a mesh plate 14021. The mesh plate 14021 facilitates the passage of gas and also facilitates the connection of the output end of the telescopic cylinder 4, thereby adapting to the lifting and lowering of the hollow ball 2; in addition, the design of the conical tube 1402 can facilitate the dry hot gas to gradually converge to the small-diameter end and the air inlet of the lower side wall of the vertical pipe 906; the vertical pipe A third rotating motor 1407 is fixed to the outside of the lower end of 906, which is used to drive the rotating shaft and the spiral blade 1404 to rotate; when the dry hot gas enters the vertical pipe 906 through the air inlet, the dry hot gas is gradually transported to the compression chamber 1405 through the spiral blade 1404, and the spiral blade 1404 gradually decreases in pitch toward the compression chamber 1405, which can also increase the gas pressure; when the compression chamber 1405 is compressed to enough gas, the electric control valve 1406 is opened at this time, and the internal compressed gas can be injected into the nozzle 202 through the hose. The above scheme receives the dry hot gas at the middle position of the carrier plate 901 through the telescopic hose 1401, so as not to affect the input of the surrounding dry hot gas into the first cabinet 1, and thus will not affect the uniformity of the dry gas at the peripheral position of the first cabinet 1, so as to achieve evaporation and drying of the condensation on the surrounding electrical components. In addition, a structure similar to an auger conveyor is formed by vertical pipe 906, spiral blades 1404, etc., which can not only increase the gas pressure but also increase the gas flow rate. By increasing the pressure, it is used to compensate for the heat lost by the dry hot gas during the transportation process.

[0082] In order to increase the output gas pressure inside the compression chamber 1405 and thus improve the gas flow rate, the pumping assembly 14 further includes a push cylinder 1408, which is fixed to the outer wall of the hollow ball 2;

[0083] The compression chamber 1405 is linearly arranged; a piston 1409 of matching size is provided inside the compression chamber 1405, and the output end of the push cylinder 1408 extends into the hollow ball 2 and is connected to the piston 1409 in the compression chamber 1405. In this solution, the compression chamber 1405 can be square-cylindrical, with a slidably connected piston 1409 inside, and under the compression of the push cylinder 1408, the gas inside the compression chamber 1405 can be squeezed into the nozzle 202.

[0084] Since the air condenser can only remove most of the moisture in the air, and water vapor is inevitably generated during the air heater heating the air, the water vapor is not easy to be discharged and will be mixed in the hot air and enter the distribution cabinet, resulting in more water vapor inside the distribution cabinet. Therefore, in order to discharge the water vapor, a chamber is left between the carrier plate 901 and the bottom of the second cabinet 9; the chamber is filled with a sponge 903; the pipe end on the output end of the air heater 12 has a bell mouth 904, and the bell mouth 904 is connected to the inside of the chamber. In this scheme, the heated gas is preferably entered into the sponge 903, and the sponge 903 absorbs as much water vapor in the air as possible. In this way, the water vapor can be discharged, and the dry hot air can enter the first cabinet 1 to reduce the moisture content in the air as much as possible and improve the efficiency of discharging condensation inside the distribution cabinet.

[0085] In order to realize the reuse of the sponge 903, the chamber is also provided with a horizontal pressing plate 905, and the horizontal pressing plate 905 is located above the sponge 903;

[0086] A second rotary motor 902 is further provided on the outside of the second cabinet 9, and the output shaft of the second rotary motor 902 extends into the chamber and is threadedly connected to the horizontal pressing plate 905. The second rotary motor 902 is used to drive the horizontal pressing plate 905 to rise and fall. The chamber is also provided with a guide rod slidably connected to the horizontal pressing plate 905, and the guide rod is parallel to the output shaft of the second rotary motor 902;

[0087] The horizontal pressing plate 905 is provided with a plurality of second vents. In this solution, a second rotary motor 902 can be provided on each side of the bottom of the second cabinet 9, and the output shaft of the second rotary motor 902 rotates and extends into the chamber, and is threadedly connected to the horizontal pressing plate 905. In this way, the two second rotary motors 902 rotate synchronously, and under the limit of the guide rod, the horizontal pressing plate 905 is driven to move up and down. During the downward movement of the horizontal pressing plate 905, the sponge 903 can be gradually squeezed downward, thereby squeezing out the water in the sponge 903, so that the discharged water falls into the bell mouth 904 and is discharged. The horizontal pressing plate 905 is provided with a plurality of second vents to facilitate the passage of dry hot air, and the surface of the horizontal pressing plate 905 can be formed into a smooth surface using a water-resistant material.

[0088] In order to facilitate the installation of the telescopic cylinder 4 and to seal and protect it, an installation box is provided in the middle of the chamber, and the telescopic cylinder 4 is located in the installation box. The output end of the telescopic cylinder 4 passes through the supporting plate 901 and extends into the first cabinet 1; the sponge 903 and the horizontal pressure plate 905 are both arranged around the installation box.

[0089] In order to facilitate the discharge of the remaining water that is squeezed out, a vertical pipe 906 is connected to the small-diameter end at the bottom of the bell mouth 904, and a valve 907 is provided at the lower end of the vertical pipe 906; an inclined pipe 908 is connected to the side wall of the vertical pipe 906, and the lower end of the inclined pipe 908 is connected to the side wall of the vertical pipe 906, and the upper end of the inclined pipe 908 is connected to the air heater 12 through a pipeline.

[0090] In order to further isolate the external temperature and reduce the formation of condensation, a gap is left between the first cabinet 1 and the second cabinet 9, and the gap is filled with a heat-insulating material 10;

[0091] The humidity sensors 6 are sequentially distributed in a rectangular array along the longitudinal depth direction of the first cabinet 1;

[0092] The humidity sensors 6 are placed in the insulation material 10, and the probes of the humidity sensors 6 are located inside the first cabinet 1. Some of the humidity sensors 6 are distributed in a matrix array, which is arranged along the two sides and top of the first cabinet 1 to form a rectangle; by arranging the matrix in sequence, a three-dimensional humidity field in the circumferential area inside the first cabinet 1 can be formed at the remote control end, so as to achieve full circumferential humidity detection and avoid missed detection.

[0093] Embodiment 2:

[0094] This embodiment 2 is further optimized on the basis of embodiment 1, and provides an anti-condensation method of an outdoor power distribution cabinet anti-condensation device, including the following specific steps:

[0095] A plurality of humidity sensors 6 are used to detect the humidity of the circumferential area inside the first cabinet 1 , and a three-dimensional humidity field is established in the remote control terminal interface.

[0096] When it is detected that the humidity of at least one area inside the first cabinet 1 is higher than the first threshold, the remote control terminal issues an alarm and controls the start-up of the air cooler 11 and the air heater 12. The air condenser condenses the outside air, condenses a large amount of water in the air, and discharges the water in the air. Then the cold air enters the air heater 12, thereby heating the cold air to form dry hot air. The dry hot air passes through the sponge 903 and is absorbed by the sponge 903. The water vapor then enters the first cabinet 1; wherein the first threshold is the humidity value at which condensation is about to form or has just formed. The water in the sponge 903 can be discharged by pressing down the horizontal pressing plate 905, so that the sponge 903 can be reused.

[0097] At this time, the third rotating motor 1407 is synchronously started, and the spiral blade 1404 is driven to rotate by the third rotating motor 1407, so that the high-pressure dry gas is filled into the compression chamber 1405 for temporary storage.

[0098] After a certain period of time, the coordinates of several areas with humidity higher than the first threshold are located in turn, and the telescopic cylinder 4 is used to control the hollow ball 2 to move to a position facing one of the areas. At this time, the telescopic hose 1401 is synchronously extended and retracted; then the hollow ball 2 is rotated by the first rotating motor 3 to aim the nozzle 202 at the area, and at this time the vertical tube can rotate relative to the conical tube.

[0099] Among them, an obstacle detection sensor is also provided on the nozzle 202. When the obstacle detection sensor detects the existence of an obstacle between the nozzle 202 and the area, the first rotating motor 3 and the telescopic cylinder 4 are controlled to adjust the position of the hollow ball 2, and the extension lengths of the several telescopic driving members 802 in the angle adjustment assembly 8 are synchronously controlled to adjust the inclination angle of the nozzle 202 until the axis of the nozzle 202 passes over the obstacle, or the injected hot air can partially enter the area.

[0100] When the hollow ball 2 is adjusted, the electric control valve 1406 is opened, and the push cylinder 1408 is started, so that the gas inside the compression chamber 1405 is pressurized and pushed into the nozzle 202, and the dry hot gas is ejected through the nozzle 202, so that the condensation in all areas with humidity higher than the first threshold is evaporated in turn, thereby improving the evaporation efficiency. In addition, when the gas inside the compression chamber 1405 is basically pushed out, the electric control valve 1406 can be closed, and the piston 1409 can be retracted to further extract the gas inside the vertical pipe; at this time, by setting the internal space size of the compression chamber 1405 and the pushing speed of the push cylinder 1408, the one-time spraying time of the nozzle 202 can be controlled, so that the nozzle 202 is intermittently sprayed, and no spraying is required during the position adjustment process.

[0101] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An outdoor power distribution cabinet anti-condensation device, characterized in that: include: A first cabinet (1), wherein the first cabinet (1) is provided with a dry hot air inlet and an air outlet; A hollow ball (2), the hollow ball (2) being located in the middle of the chamber of the first cabinet (1); the first cabinet (1) is provided with a first rotating motor (3) and a telescopic cylinder (4) at the upper and lower ends respectively, the output shafts of the first rotating motor (3) and the telescopic cylinder (4) being coaxially arranged and respectively connected to the upper and lower ends of the hollow ball (2); The output shaft of the first rotating motor (3) is fixedly connected to the hollow ball (2) via a telescopic rod (5) and is used to drive the hollow ball (2) to rotate; The output shaft end of the telescopic cylinder (4) is rotatably connected to the hollow ball (2), and the hollow ball (2) can rotate around the output shaft axis of the telescopic cylinder (4); The hollow ball (2) is provided with an air extraction component (14), the air extraction component (14) being used to extract dry hot air, the output end of the air extraction component (14) being connected to a nozzle (202) via a hose, and one end of the nozzle (202) extending through a through hole on a side wall of the hollow ball (2); A plurality of humidity sensors (6) are evenly distributed around the inner side of the first cabinet (1).

2. The anti-condensation device for outdoor power distribution cabinet according to claim 1, characterized in that: A sealing sleeve (7) is arranged outside the through hole of the hollow ball (2); one end of the nozzle (202) extends into the interior of the sealing sleeve (7) and passes through the small diameter end of the sealing sleeve (7); the large diameter end of the sealing sleeve (7) is connected to another through hole of the hollow ball (2); The hollow ball (2) is also provided with an angle adjustment component (8) inside, and the angle adjustment component (8) is used to drive the other end of the nozzle (202) to deviate circumferentially; The angle adjustment assembly (8) comprises a circular ring (801), wherein the circular ring (801) is fixed inside the hollow ball (2); at least three telescopic driving members (802) are evenly distributed circumferentially on the inner side surface of the circular ring (801), and the output ends of all the telescopic driving members (802) are connected to the outer side wall of the nozzle (202); The fixed end and the output end of the telescopic driving member (802) are respectively connected to the inner side of the circular ring (801) and the outer side of the nozzle (202) through a ball joint (803).

3. The anti-condensation device for outdoor power distribution cabinet according to claim 1, characterized in that: The end of the telescopic rod (5) away from the first rotating motor (3) is provided with a ball cover, the ball cover and the outer diameter of the hollow ball (2) are matched, and the ball cover is closely attached to the outer wall of the hollow ball (2); the ball cover and the hollow ball (2) are connected by bolts; The output shaft end of the telescopic cylinder (4) is rotatably connected to the hollow ball (2).

4. The anti-condensation device for outdoor power distribution cabinet according to claim 1, characterized in that: It also includes a second cabinet (9), the second cabinet (9) and the first cabinet (1) being arranged in sequence from the outside to the inside; it also includes an air cooler (11) and an air heater (12) located outside the second cabinet (9), the output end of the air cooler (11) and the air heater (12), the output end of the air heater (12) being connected to the bottom of the second cabinet (9) through a pipeline; The second cabinet (9) has a bearing plate (901) inside, and the first cabinet (1) is placed on the bearing plate (901); the bearing plate (901) is provided with a plurality of first ventilation holes, and the bottom of the second cabinet (9) is connected to the inside of the first cabinet (1) through the plurality of first ventilation holes.

5. The anti-condensation device for outdoor power distribution cabinet according to claim 4, characterized in that: The air extraction assembly (14) comprises a telescopic hose (1401), a conical tube (1402), a vertical tube (1403) and a compression chamber (1405); the lower end of the telescopic hose (1401) is connected to the bearing plate (901), and part of the first vent holes are in communication with the telescopic hose (1401); the large-diameter end at the bottom of the conical tube (1402) is in communication with the upper end of the telescopic hose (1401); the small-diameter end at the top of the conical tube (1402) is rotatably sleeved on the vertical tube (1403), and the vertical tube (1403) can rotate around its own axis; the large-diameter end of the conical tube (1402) is provided with a mesh plate (14021), and the output shaft end of the telescopic cylinder (4) is fixedly connected to the mesh plate (14021); The upper end of the vertical tube (1403) penetrates into the hollow ball (2) from the lower end of the hollow ball (2) and is connected to the compression chamber (1405); a rotating shaft is coaxially arranged inside the vertical tube (1403), and a spiral blade (1404) is sleeved on the rotating shaft, and the outer diameter of the spiral blade (1404) is matched with the inner diameter of the vertical tube (1403); a third rotating motor (1407) is fixed outside the lower end of the vertical tube (1403), and the third rotating motor (1407) is used to drive the rotating shaft to rotate, and the upper end of the rotating shaft is rotatably connected to the compression chamber (1405); the compression chamber (1405) is fixedly connected to the inside of the hollow ball (2); the pitch of the spiral blade (1404) gradually decreases towards the compression chamber (1405); The lower end side wall of the vertical tube (1403) is provided with an air inlet, and the side wall of the compression chamber (1405) is provided with a back pressure hole connected to the interior of the compression chamber (1405) and the upper end of the vertical tube (1403); the side wall of the compression chamber (1405) is also provided with an air outlet, and the air outlet is provided with an electric control valve (1406), and the output end of the electric control valve (1406) is connected to the nozzle (202) through a hose.

6. The anti-condensation device for outdoor power distribution cabinet according to claim 5, characterized in that: The air extraction assembly (14) further comprises a pushing cylinder (1408), wherein the pushing cylinder (1408) is fixed on the outer wall of the hollow ball (2); The compression chamber (1405) is arranged linearly; a piston (1409) of matching size is provided inside the compression chamber (1405); the output end of the push cylinder (1408) extends into the hollow ball (2) and is connected to the piston (1409) in the compression chamber (1405).

7. The anti-condensation device for outdoor power distribution cabinet according to claim 4, characterized in that: A chamber is left between the bearing plate (901) and the bottom of the second cabinet (9); the chamber is filled with a sponge (903); the end of the pipe on the output end of the air heater (12) is provided with a bell mouth (904), and the bell mouth (904) is connected to the inside of the chamber; The chamber is also provided with a horizontal pressing plate (905), and the horizontal pressing plate (905) is located above the sponge (903); A second rotating motor (902) is also provided on the outside of the second cabinet (9), the output shaft of the second rotating motor (902) extends into the chamber and is threadedly connected to the horizontal pressing plate (905), the second rotating motor (902) is used to drive the horizontal pressing plate (905) to rise and fall, and the chamber is also provided with a guide rod slidably connected to the horizontal pressing plate (905), and the guide rod is parallel to the output shaft of the second rotating motor (902); The horizontal pressing plate (905) is provided with a plurality of second ventilation holes.

8. The anti-condensation device for outdoor power distribution cabinet according to claim 7, characterized in that: The small-diameter end at the bottom of the bell mouth (904) is connected to a vertical pipe (906), and a valve (907) is provided at the lower end of the vertical pipe (906); the side wall of the vertical pipe (906) is connected to an inclined pipe (908), the lower end of the inclined pipe (908) is connected to the side wall of the vertical pipe (906), and the upper end of the inclined pipe (908) is connected to the air heater (12) through a pipeline.

9. The anti-condensation device for outdoor power distribution cabinet according to claim 4, characterized in that: A gap is left between the first cabinet (1) and the second cabinet (9), and the gap is filled with a thermal insulation material (10); The plurality of humidity sensors (6) are sequentially distributed in a rectangular array along the longitudinal depth direction of the first cabinet (1); The plurality of humidity sensors (6) are all placed in the thermal insulation material (10), and the probes of the plurality of humidity sensors (6) are all located on the inner side of the first cabinet (1).

10. The anti-condensation method of an outdoor power distribution cabinet anti-condensation device according to any one of claims 2 to 9, characterized in that: The following steps are involved: S1: using a plurality of humidity sensors (6) to detect humidity in a region around the inner side of the first cabinet (1) to establish a three-dimensional humidity field; S2: when it is detected that the humidity of at least one area inside the first cabinet (1) is higher than a first threshold, dry hot air is passed through a dry hot air inlet on the first cabinet (1); S3: sequentially locating the coordinates of a plurality of regions where the humidity is higher than the first threshold, controlling the hollow ball (2) to move to a position facing one of the regions, and rotating the hollow ball (2) so that the nozzle (202) is aimed at the region; S21: The nozzle (202) is also provided with an obstacle detection sensor. When the obstacle detection sensor detects that there is an obstacle between the nozzle (202) and the area, the first rotating motor (3) and the telescopic cylinder (4) are controlled to adjust the position of the hollow ball (2), and the angle adjustment component (8) is synchronously controlled to adjust the inclination angle of the nozzle (202) until the axis of the nozzle (202) passes over the obstacle. S3: After the hollow ball (2) is adjusted, the extraction component (14) is started to extract part of the dry hot air, and the dry hot air is sprayed out through the nozzle (202), thereby evaporating the condensation in all areas where the humidity is higher than the first threshold in turn.

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