Internal environment monitoring device of electrical equipment

Abstract

The utility model relates to an internal environment monitoring device of electrical equipment, and relates to the technical field of environment monitoring of the electrical equipment, the internal environment monitoring device comprises an electrical box, a driving assembly, a detection assembly and a cleaning assembly, the electrical box is communicated with an exhaust pipe; the driving assembly is arranged in the electrical box and is used for blowing and stirring dust and humid air in the electrical box; the detection assembly is arranged in the electrical box and is used for detecting the dust concentration and humidity in the electrical box; the cleaning assembly comprises an air pump and a cleaning part, the air pump is connected to the exhaust pipe in series, the cleaning part is arranged on the exhaust pipe, and the cleaning part is used for cleaning dust and humid air in the electrical box. The method has the effect of improving the detection efficiency of the internal environment of the electrical equipment.

Description

Technical Field

[0001] The present application relates to the technical field of environmental monitoring of electrical equipment, and in particular to an internal environment monitoring device of electrical equipment. Background Art

[0002] Electrical equipment consists of power sources and power-consuming equipment. It is an important equipment system in daily production and work. In order to ensure the normal operation of electrical equipment, internal environment monitoring devices are needed to monitor the internal environment of the electrical equipment.

[0003] At present, general monitoring devices adjust the humidity sensor monitoring area to increase the monitoring range and improve the monitoring accuracy. The fan then draws the dehumidified air into the electrical equipment body and discharges the humid gas to prevent the internal electrical components from being damaged due to excessive moisture.

[0004] However, since a large amount of dust accumulates in the electrical box after long-term operation, the dust easily adheres to the electrical components, affecting the heat dissipation of the electrical components, thereby causing damage to the electrical components. Utility Model Content

[0005] In order to improve the internal environment detection efficiency of electrical equipment, the present application provides an internal environment monitoring device of electrical equipment.

[0006] The present application provides an internal environment monitoring device for electrical equipment, which adopts the following technical solution:

[0007] An internal environment monitoring device for electrical equipment comprises an electrical box, a drive assembly, a detection assembly and a cleaning assembly, wherein the electrical box is connected to an exhaust pipe; the drive assembly is arranged in the electrical box and is used to blow and stir the dust and humid air inside the electrical box; the detection assembly is arranged in the electrical box and is used to detect the dust concentration and humidity inside the electrical box; the cleaning assembly comprises an air pump and a cleaning part, the air pump is connected in series to the exhaust pipe, the cleaning part is arranged on the exhaust pipe, and the cleaning part is used to clean the dust and humid air in the electrical box.

[0008] By adopting the above technical scheme, the driving component blows the dust and humid air inside the electrical box, and the detection component detects the dust concentration and humidity inside the electrical box. When the dust concentration and humidity inside the electrical box exceed the preset value, the detection component controls the air pump to open, and discharges the dust and humid air inside the electrical box to the exhaust pipe. At the same time, the cleaning part cleans the dust and humid air inside the electrical box, thereby easily improving the internal environment detection efficiency of the electrical equipment, and then easily keeping the inside of the electrical box clean and dry.

[0009] Optionally, the drive assembly includes a drive part and a transmission part, the drive part includes a motor, a drive gear and an end gear, the motor is fixed on the electrical box; the drive gear is coaxially fixed to the output shaft of the motor and is located in the electrical box, the end gear is rotatably connected to the electrical box and meshes with the drive gear; the transmission part is arranged on the drive part and is used to blow away dust and humid air inside the electrical box.

[0010] By adopting the above technical solution, the motor drives the driving gear to rotate, the driving gear drives the end face gear to rotate, the end face gear drives the transmission part to rotate, the transmission part blows and stirs the dust and moist air inside the electrical box, and the transmission part converts the driving force into blowing and stirring force;

[0011] On the one hand, the wind can make the humid air inside the electrical box evaporate and dry easily. On the other hand, it can blow up the dust inside the electrical box, making the internal dust more uniform and easier to detect, thereby improving the detection accuracy.

[0012] Optionally, the transmission part includes a ring gear, a driven gear, bevel gear one, bevel gear two and a fan, the ring gear is fixed in the electrical box and is located on one side of the end face gear; the driven gear is meshed with the ring gear, the driven gear is coaxially fixedly connected with the bevel gear, and is rotatably connected to the end face gear through a support plate; the bevel gear two is meshed with the bevel gear one and is rotatably connected to the support plate; the fan is coaxially fixedly connected to the bevel gear two, and is located on the side of the bevel gear two away from the inner wall of the electrical box.

[0013] By adopting the above technical solution, the end gear drives the driven gear to move, the ring gear drives the driven gear to rotate, the driven gear drives the bevel gear one to rotate, the bevel gear one drives the bevel gear two to rotate, the bevel gear two drives the fan to rotate, and the fan blows up the dust in the electrical box, making the internal dust more uniform, easier to detect, and improving the detection accuracy.

[0014] Optionally, the cleaning part includes a dust removal plate and a dehumidification plate, both of which are slidably arranged on the exhaust pipe, and the dehumidification plate is located on the side of the dust removal plate away from the air pump; an interception net is arranged on the dust removal plate, and a sponge is arranged on the dehumidification plate.

[0015] By adopting the above technical solution, the interception net arranged on the dust removal plate can effectively intercept and collect dust particles discharged through the exhaust pipe, making the dust removal process more direct and efficient, thereby reducing the potential impact of dust on electrical equipment;

[0016] The sponge set on the dehumidification board can effectively absorb and remove moisture from the humid air discharged through the exhaust pipe by utilizing its water absorption characteristics, which can not only prevent moisture from corroding and damaging electrical equipment, but also keep the equipment operating environment dry, thereby improving the stability and service life of the equipment.

[0017] Optionally, the detection component includes a dust concentration sensor, a humidity sensor and a controller, the dust concentration sensor and the humidity sensor are both fixedly connected in the electrical box, the dust concentration sensor is used to output a dust concentration signal in the electrical box, and the humidity sensor is used to output a humidity signal in the electrical box; the controller is fixedly connected to the outer wall of the electrical box and electrically connected to the air pump, the dust concentration sensor and the humidity sensor are both electrically connected to the controller, and in response to the dust concentration signal output by the dust concentration sensor and the humidity signal output by the humidity sensor, the controller is used to control the start and stop of the air pump.

[0018] By adopting the above technical scheme, the dust concentration sensor outputs the dust concentration signal inside the electrical box, the humidity sensor outputs the humidity signal inside the electrical box, the controller responds to the dust concentration signal output by the dust concentration sensor and the humidity signal output by the humidity sensor, and controls the air pump to turn on, thereby easily realizing intelligent regulation of the internal environment of the electrical box, thereby greatly improving the operating efficiency and stability of the electrical equipment.

[0019] Optionally, a protective component is also included, which includes an electric telescopic rod and a blocking plate, wherein the electric telescopic rod is fixedly connected to the outside of the electrical box and is electrically connected to the controller; the blocking plate is slidably inserted into the exhaust pipe, the outer periphery of the blocking plate abuts against the inner periphery of the exhaust pipe, and one side of the blocking plate is fixedly connected to the movable end of the electric telescopic rod.

[0020] By adopting the above technical solution, when the dust concentration and humidity inside the electrical box exceed the preset value, the controller controls the movable end of the electric telescopic rod to retract, and the movable end of the electric telescopic rod drives the blocking plate to move outside the exhaust pipe to open the exhaust channel;

[0021] When the dust concentration and humidity inside the electrical box are lower than the preset values, the controller controls the active end of the electric telescopic rod to extend, and the active end of the electric telescopic rod drives the blocking plate to move into the exhaust pipe, closing the exhaust pipe, making it difficult for external dust to enter the electrical box, thereby easily protecting the equipment and circuits in the electrical box from pollution and damage.

[0022] Optionally, a plurality of driven gears, bevel gear 1, bevel gear 2 and fans are provided, and the plurality of driven gears, bevel gear 1, bevel gear 2 and fans are arranged along a circle of the end face gear.

[0023] By adopting the above technical solution, the blowing and stirring range is expanded by increasing the number of driven gears, bevel gear one, bevel gear two and fans, so that the blowing and stirring efficiency is easily improved.

[0024] Optionally, a through hole is opened on one side of the electrical box, and a rotating door is hinged in the through hole.

[0025] By adopting the above technical solution, the design of the rotating door enables the internal space of the electrical box to be conveniently opened and closed, thereby facilitating the user to perform maintenance, inspection or operation of the equipment.

[0026] Optionally, an insertion strip is slidably connected to the rotating door, a fixing block is fixedly provided on the electrical box, a slot is provided on the fixing block, and the insertion strip is slidably connected to the slot.

[0027] By adopting the above technical solution, the security of the electrical box is enhanced due to the close fit between the insertion strip and the card slot; when the rotating door is closed, the insertion strip is fully inserted into the card slot to form a firm connection, which effectively prevents unauthorized access or misoperation, thereby helping to protect the equipment and circuits in the electrical box from damage or theft.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. By setting up the driving part and the transmission part, the internal dust is made more uniform, easier to detect, and the detection accuracy is improved;

[0030] 2. By setting up an air pump and a cleaning unit, it is easy to improve the internal environment detection efficiency of electrical equipment, and thus it is easy to keep the inside of the electrical box clean and dry;

[0031] 3. By setting up dust concentration sensors, humidity sensors and controllers, it is easy to realize intelligent control of the internal environment of the electrical box, thereby greatly improving the operating efficiency and stability of electrical equipment;

[0032] 4. By setting up the electric telescopic rod and the blocking plate, it is difficult for external dust to enter the electrical box, thereby easily protecting the equipment and circuits in the electrical box from pollution and damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application;

[0034] Figure 2 is a cross-sectional view of a drive assembly in an embodiment of the present application;

[0035] Figure 3 yes Figure 1 Magnified view at A in the middle.

[0036] Description of reference numerals:

[0037] 1. Electrical box; 11. Exhaust pipe; 12. Rotating door; 13. Insert strip; 14. Fixed block; 2. Driving assembly; 21. Driving unit; 211. Motor; 212. Driving gear; 213. Face gear; 22. Transmission unit; 221. Ring gear; 222. Driven gear; 223. Bevel gear one; 224. Bevel gear two; 225. Fan; 3. Detection assembly; 31. Dust concentration sensor; 32. Humidity sensor; 33. Controller; 4. Cleaning assembly; 41. Air pump; 42. Cleaning unit; 421. Dust removal plate; 422. Dehumidification plate; 5. Protection assembly; 51. Electric telescopic rod; 52. Blocking plate. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-3 This application is described in further detail.

[0039] The present application embodiment discloses an internal environment monitoring device for electrical equipment. Figure 1 and Figure 2 An internal environment monitoring device for electrical equipment includes an electrical box 1, a driving component 2, a detection component 3, a cleaning component 4 and a protective component 5. The electrical box 1 is connected to an exhaust pipe 11; the driving component 2 is arranged in the electrical box 1, and is used to blow and stir the dust and humid air inside the electrical box 1; the detection component 3 is arranged in the electrical box 1, and is used to detect the dust concentration and humidity inside the electrical box 1; the cleaning component 4 is arranged on the exhaust pipe 11, and is used to clean the dust and humid air in the electrical box 1; the protective component 5 is arranged on the exhaust pipe 11, and is used to prevent external dust from entering the electrical box 1.

[0040] When in use, the driving component 2 blows the dust and humid air inside the electrical box 1, and the detection component 3 detects the dust concentration and humidity inside the electrical box 1. When the dust concentration and humidity inside the electrical box 1 exceed the preset value, the protection component 5 opens the exhaust pipe 11 channel, and the detection component 3 discharges the dust and humid air inside the electrical box 1 to the outside of the exhaust pipe 11. The cleaning component 4 cleans the dust and humid air in the electrical box 1, thereby easily improving the internal environment detection efficiency of the electrical equipment, and then easily keeping the inside of the electrical box 1 clean and dry.

[0041] Reference Figure 1 The electrical box 1 is in a circular box shape and is arranged vertically. The exhaust pipe 11 is in a rectangular tube shape and is arranged horizontally. The exhaust pipe 11 is located on one side of the electrical box 1. A through hole is opened on one side of the electrical box 1. The through hole is rectangular and is located on one side of the exhaust pipe 11. A rotating door 12 is hinged in the through hole, and the rotating door 12 is adapted to the through hole.

[0042] Reference Figure 1 and Figure 3The rotating door 12 is slidably connected with an insertion strip 13, which is in a rectangular strip shape and is arranged horizontally. A fixing block 14 is fixedly arranged on the electrical box 1, and a card slot is provided on a side of the fixing block 14 close to the insertion strip 13, and the insertion strip 13 is slidably connected with the card slot and adapted to the card slot.

[0043] Reference Figure 2 The driving assembly 2 includes a driving part 21 and a transmission part 22. The driving part 21 includes a motor 211, a driving gear 212 and an end gear 213. The motor 211 is fixed on the outer wall of the electrical box 1 and is electrically connected to an external power source. The output shaft of the motor 211 is passed through the electrical box 1. The driving gear 212 is coaxially fixedly connected to the output shaft of the motor 211 and is located in the electrical box 1. The end gear 213 is rotatably connected to the electrical box 1 and meshes with the driving gear 212.

[0044] Reference Figure 2 The transmission part 22 includes a ring gear 221, four driven gears 222, four bevel gears 1 223, four bevel gears 224 and four fans 225. The ring gear 221 is fixed in the electrical box 1 and is located above the end gear 213. The four driven gears 222 are evenly arranged along the periphery of the end gear 213, and the driven gears 222 are meshed with the ring gear 221.

[0045] The four bevel gears 1 223 correspond to the four end face gears 213 one by one. The driven gear 222 is coaxially fixedly connected with the bevel gear 1 223 and is rotationally connected to the end face gear 213 through the support plate. The four bevel gears 2 224 correspond to the four bevel gears 1 223 one by one. The bevel gears 2 224 mesh with the bevel gear 1 223 and are rotationally connected to the support plate.

[0046] The four fans 225 correspond to the four bevel gears 224 one by one. The fan 225 is coaxially fixedly connected with the bevel gear 224 and is located on a side of the bevel gear 224 away from the inner wall of the electrical box 1.

[0047] When in use, start the motor 211, the output shaft of the motor 211 drives the driving gear 212 to rotate, the driving gear 212 drives the end gear 213 to rotate, the end gear 213 drives the driven gear 222 to move, the ring gear 221 drives the driven gear 222 to rotate, the driven gear 222 drives the bevel gear 1 223 to rotate, the bevel gear 1 223 drives the bevel gear 224 to rotate, the bevel gear 224 drives the fan 225 to rotate, the fan 225 blows up the dust in the electrical box 1, making the internal dust more uniform, easier to detect, and improving the detection accuracy.

[0048] Reference Figure 2The detection component 3 includes a dust concentration sensor 31, a humidity sensor 32 and a controller 33. The dust concentration sensor 31 and the humidity sensor 32 are both fixedly connected to the electrical box 1, and the dust concentration sensor 31 is located on one side of the humidity sensor 32.

[0049] The dust concentration sensor 31 is used to output a dust concentration signal in the electrical box 1, and the humidity sensor 32 is used to output a humidity signal in the electrical box 1. The controller 33 is fixedly connected to the outer wall of the electrical box 1, and the dust concentration sensor 31 and the humidity sensor 32 are both electrically connected to the controller 33, and respond to the dust concentration signal output by the dust concentration sensor 31 and the humidity signal output by the humidity sensor 32.

[0050] Reference Figure 1 and Figure 2 The cleaning assembly 4 includes an air pump 41 and a cleaning unit 42. The air pump 41 is connected in series to the exhaust pipe 11 and is electrically connected to the controller 33. The cleaning unit 42 includes a dust removal plate 421 and a dehumidification plate 422. The dust removal plate 421 and the dehumidification plate 422 are both slidably arranged on the exhaust pipe 11, and the outer peripheries of both are in contact with the inner periphery of the exhaust pipe 11. The dehumidification plate 422 is located on the side of the dust removal plate 421 away from the air pump 41. A handle is fixed on one side of the dust removal plate 421 and the dehumidification plate 422. An interception net is arranged on the dust removal plate 421, and a sponge is arranged on the dehumidification plate 422.

[0051] When in use, the dust concentration sensor 31 outputs a dust concentration signal in the electrical box 1, and the humidity sensor 32 outputs a humidity signal in the electrical box 1. The controller 33 responds to the dust concentration signal output by the dust concentration sensor 31 and the humidity signal output by the humidity sensor 32, and controls the air pump 41 to turn on, and the air pump 41 discharges the dust and humid air in the electrical box 1.

[0052] The interception net intercepts dust particles discharged through the exhaust pipe 11, and the sponge absorbs moisture in the humid air discharged through the exhaust pipe 11, thereby easily reducing the potential impact of dust on electrical equipment, and also preventing moisture from corroding and damaging electrical equipment, thereby improving the stability and service life of the equipment.

[0053] Reference Figure 1 and Figure 2 The protection assembly 5 includes an electric telescopic rod 51 and a blocking plate 52. The electric telescopic rod 51 is vertically arranged and fixedly connected to the outer wall of the electrical box 1. The electric telescopic rod 51 is electrically connected to the controller 33. The blocking plate 52 is slidably arranged on the exhaust pipe 11 and is located on the side of the dehumidification plate 422 away from the dust removal plate 421. The outer periphery of the blocking plate 52 abuts against the inner periphery of the exhaust pipe 11, and one side of the blocking plate 52 is fixedly connected to the movable end of the electric telescopic rod 51. In the initial state, the blocking plate 52 is located in the exhaust pipe 11.

[0054] When in use, when the dust concentration and humidity inside the electrical box 1 exceed the preset value, the controller 33 controls the movable end of the electric telescopic rod 51 to retract, and the movable end of the electric telescopic rod 51 drives the blocking plate 52 to move outside the exhaust pipe 11 to open the exhaust passage;

[0055] When the dust concentration and humidity inside the electrical box 1 are lower than the preset values, the controller 33 controls the active end of the electric telescopic rod 51 to extend, and the active end of the electric telescopic rod 51 drives the blocking plate 52 to move into the exhaust pipe 11, closing the exhaust pipe 11, making it difficult for external dust to enter the electrical cabinet, thereby easily protecting the equipment and circuits in the electrical box 1 from pollution and damage.

[0056] The implementation principle of the internal environment monitoring device of an electrical device according to the embodiment of the present application is as follows: the output shaft of the motor 211 drives the driving gear 212 to rotate, the driving gear 212 drives the end gear 213 to rotate, the end gear 213 drives the driven gear 222 to move, the gear ring 221 drives the driven gear 222 to rotate, the driven gear 222 drives the bevel gear 1 223 to rotate, the bevel gear 1 223 drives the bevel gear 224 to rotate, the bevel gear 224 drives the fan 225 to rotate, and the fan 225 blows up the dust in the electrical box 1;

[0057] The dust concentration sensor 31 outputs a dust concentration signal in the electrical box 1, the humidity sensor 32 outputs a humidity signal in the electrical box 1, and the controller 33 responds to the dust concentration signal output by the dust concentration sensor 31 and the humidity signal output by the humidity sensor 32;

[0058] When the dust concentration and humidity inside the electrical box 1 exceed the preset value, the controller 33 controls the movable end of the electric telescopic rod 51 to retract, and the movable end of the electric telescopic rod 51 drives the blocking plate 52 to move outside the exhaust pipe 11 to open the exhaust passage; at the same time, the controller 33 controls the air pump 41 to turn on, and the air pump 41 discharges the dust and humid air inside the electrical box 1;

[0059] The interception net intercepts dust particles discharged through the exhaust pipe 11, and the sponge absorbs moisture in the humid air discharged through the exhaust pipe 11, thereby easily reducing the potential impact of dust on electrical equipment, and also preventing moisture from corroding and damaging electrical equipment, thereby improving the stability and service life of the equipment.

[0060] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An internal environment monitoring device for electrical equipment, characterized in that: The invention comprises an electrical box (1), a driving assembly (2), a detection assembly (3) and a cleaning assembly (4); the electrical box (1) is connected to an exhaust pipe (11); the driving assembly (2) is arranged in the electrical box (1) and is used to blow away dust and humid air inside the electrical box (1); the detection assembly (3) is arranged in the electrical box (1) and is used to detect the dust concentration and humidity inside the electrical box (1); the cleaning assembly (4) comprises an air pump (41) and a cleaning unit (42); the air pump (41) is connected in series to the exhaust pipe (11); the cleaning unit (42) is arranged on the exhaust pipe (11); and the cleaning unit (42) is used to clean dust and humid air inside the electrical box (1).

2. The internal environment monitoring device of an electrical device according to claim 1, characterized in that: The drive assembly (2) comprises a drive part (21) and a transmission part (22); the drive part (21) comprises a motor (211), a drive gear (212) and an end gear (213); the motor (211) is fixedly mounted on the electrical box (1); the drive gear (212) is coaxially fixedly connected to an output shaft of the motor (211) and is located in the electrical box (1); the end gear (213) is rotatably connected in the electrical box (1) and meshes with the drive gear (212); the transmission part (22) is arranged on the drive part (21) and is used to blow away dust and humid air inside the electrical box (1).

3. The internal environment monitoring device of an electrical device according to claim 2, characterized in that: The transmission part (22) comprises a ring gear (221), a driven gear (222), a bevel gear one (223), a bevel gear two (224) and a fan (225); the ring gear (221) is fixedly arranged in the electrical box (1) and is located on one side of the end face gear (213); the driven gear (222) is meshed with the ring gear (221); the driven gear (222) is coaxially fixedly connected to the bevel gear one (223) and is rotationally connected to the end face gear (213) via a support plate; the bevel gear two (224) is meshed with the bevel gear one (223) and is rotationally connected to the support plate; the fan (225) is coaxially fixedly connected to the bevel gear two (224) and is located on a side of the bevel gear two (224) away from the inner wall of the electrical box (1).

4. The internal environment monitoring device of an electrical device according to claim 1, characterized in that: The cleaning portion (42) comprises a dust removal plate (421) and a dehumidification plate (422); the dust removal plate (421) and the dehumidification plate (422) are both slidably disposed on the exhaust pipe (11); the dehumidification plate (422) is located on a side of the dust removal plate (421) away from the air pump (41); an interception net is disposed on the dust removal plate (421), and a sponge is disposed on the dehumidification plate (422).

5. The internal environment monitoring device of an electrical device according to claim 1, characterized in that: The detection component (3) comprises a dust concentration sensor (31), a humidity sensor (32) and a controller (33); the dust concentration sensor (31) and the humidity sensor (32) are both fixedly connected to the electrical box (1); the dust concentration sensor (31) is used to output a dust concentration signal in the electrical box (1); and the humidity sensor (32) is used to output a humidity signal in the electrical box (1); the controller (33) is fixedly connected to the outer wall of the electrical box (1) and is electrically connected to the air pump (41); the dust concentration sensor (31) and the humidity sensor (32) are both electrically connected to the controller (33); and in response to the dust concentration signal output by the dust concentration sensor (31) and the humidity signal output by the humidity sensor (32), the controller (33) is used to control the start and stop of the air pump (41).

6. The internal environment monitoring device of an electrical device according to claim 5, characterized in that: The invention also comprises a protection component (5), the protection component (5) comprising an electric telescopic rod (51) and a blocking plate (52), the electric telescopic rod (51) being fixedly connected to the outside of the electrical box (1) and being electrically connected to the controller (33); the blocking plate (52) being slidably arranged on the exhaust pipe (11), the outer periphery of the blocking plate (52) being in contact with the inner periphery of the exhaust pipe (11), and one side of the blocking plate (52) being fixedly connected to the movable end of the electric telescopic rod (51).

7. The internal environment monitoring device of an electrical device according to claim 3, characterized in that: A plurality of driven gears (222), bevel gear one (223), bevel gear two (224) and fans (225) are provided, and the plurality of driven gears (222), bevel gear one (223), bevel gear two (224) and fans (225) are arranged along a circle of the end face gear (213).

8. The internal environment monitoring device of an electrical device according to claim 1, characterized in that: A through hole is provided on one side of the electrical box (1), and a rotating door (12) is hinged in the through hole.

9. The internal environment monitoring device of an electrical device according to claim 8, characterized in that: The rotating door (12) is slidably connected with an insertion strip (13), the electrical box (1) is fixedly provided with a fixing block (14), the fixing block (14) is provided with a slot, and the insertion strip (13) is slidably connected with the slot.

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