CN209877535U

CN209877535U - Drying system for power distribution cabinet

Info

Publication number: CN209877535U
Application number: CN201920688376.4U
Authority: CN
Inventors: 孔祥慧
Original assignee: Tongzhou Beijing Switch Co Ltd
Current assignee: Tongzhou Beijing Switch Co Ltd
Priority date: 2019-05-14
Filing date: 2019-05-14
Publication date: 2019-12-31
Anticipated expiration: 2029-05-14

Abstract

The utility model relates to a drying system for a power distribution cabinet, which comprises an oven and a sealing door arranged outside the head side of the oven, wherein the head side of the oven is provided with an inlet and an outlet matched with the sealing door, and the inner wall of the oven is fixedly provided with a heating wire; the drying oven is characterized by further comprising a vacuum pump positioned outside the drying oven and a dryer positioned inside the drying oven, wherein a first air valve is arranged between the air exhaust end of the vacuum pump and the inner cavity of the drying oven, one end of the first air valve is communicated with the air exhaust end of the vacuum pump, and the other end of the first air valve is communicated with the inner cavity of the drying oven; and a second air valve is arranged outside the oven, and one end of the second air valve is communicated with the inner cavity of the oven. Drying system for switch board carries out preliminary drying to the switch board that wets under the environment of low temperature negative pressure earlier stage, and the later stage adopts the desicator to carry out the secondary to remaining aqueous vapor and dries, guarantees that the inside of switch board is dried completely, and it is effectual to dry, and the stoving time is short, and drying efficiency is high, implements effectually.

Description

Drying system for power distribution cabinet

Technical Field

The utility model relates to a drying system for switch board belongs to switch board technical field.

Background

The switch board is the final equipment of distribution system. Generally divided into high voltage distribution cabinets, low voltage distribution cabinets and the like. The power distribution cabinet is an electrical appliance product which is used for power generation, power transmission, power distribution, electric energy conversion and consumption of an electric power system and plays roles of on-off, control or protection and the like, and the voltage class is 3.6 kV-550 kV, and mainly comprises a high-voltage circuit breaker, a high-voltage isolating switch, a grounding switch, a high-voltage load switch, a high-voltage automatic reclosing and sectioning device, a high-voltage operating mechanism, a high-voltage explosion-proof power distribution device, a high-voltage switch cabinet and the like. They distribute the power of a circuit of a higher level of power distribution equipment to nearby loads, which provide protection, monitoring and control of the loads.

Present switch board is because inner structure is compact, in case the switch board leads to its inside intake because reasons such as waterlogging, if not timely dehumidification stoving, then will reduce electric dielectric strength, cause the accident. At present, the drying room is mostly adopted for dehumidifying the power distribution cabinet, the temperature inside the drying room is 50-60 ℃, then air is continuously blown into the drying room, and thus, the drying operation of the power distribution cabinet can be completed within 1-2 days after continuous drying. Because the electrical appliance in the power distribution cabinet can not be in a high-temperature environment for a long time, otherwise, the electrical appliance is easy to age quickly, and the service life of the electrical appliance is reduced; therefore, the temperature inside the drying room cannot be too high, which severely restricts the improvement of the drying efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model provides a drying system for switch board to the not enough of prior art existence, concrete technical scheme as follows:

a drying system for a power distribution cabinet comprises an oven and a sealing door arranged outside the head side of the oven, wherein the head side of the oven is provided with an inlet and an outlet matched with the sealing door, and the inner wall of the oven is fixedly provided with an electric heating wire; the drying oven is characterized by further comprising a vacuum pump positioned outside the drying oven and a dryer positioned inside the drying oven, wherein a first air valve is arranged between the air exhaust end of the vacuum pump and the inner cavity of the drying oven, one end of the first air valve is communicated with the air exhaust end of the vacuum pump, and the other end of the first air valve is communicated with the inner cavity of the drying oven; and a second air valve is arranged outside the oven, and one end of the second air valve is communicated with the inner cavity of the oven.

As an improvement of the above technical scheme, the dryer comprises a cylindrical vertical cylinder, a sealing cover arranged at the lower end of the vertical cylinder, a desiccant layer positioned inside the vertical cylinder, a circular electromagnet positioned inside the vertical cylinder, a disc-shaped permanent magnet matched with the inner wall of the vertical cylinder, and a circular groove sleeved outside the vertical cylinder, wherein the sealing cover is in threaded connection with the lower end of the vertical cylinder, the electromagnet is arranged above the desiccant layer, the outer ring of the electromagnet is fixedly connected with the inner wall of the vertical cylinder, and the permanent magnet is arranged above the electromagnet; the bottom of the circular groove is provided with a through hole matched with the outer side wall of the vertical cylinder, and the outer side wall of the upper end of the vertical cylinder is hermetically connected with the wall of the through hole; the upper portion of the vertical cylinder is provided with a plurality of baffle rods positioned outside the permanent magnet, the axial direction of the baffle rods is parallel to the axial direction of the vertical cylinder, the lower ends of the baffle rods are fixedly connected with the upper end of the vertical cylinder, and the baffle rods are all arranged inside the circular groove.

As an improvement of the technical scheme, an annular gasket is arranged between the permanent magnet and the electromagnet and is fixedly connected with the electromagnet.

As an improvement of the technical scheme, a cross rod used for blocking the permanent magnet is fixedly arranged at the upper end of the blocking rod, and the cross rod is perpendicular to the blocking rod.

As an improvement of the technical scheme, the inner diameter of the vertical cylinder is in clearance fit with the diameter of the permanent magnet.

As an improvement of the technical scheme, a pressure vacuum gauge for measuring the air pressure in the oven is arranged outside the oven.

As an improvement of the technical scheme, a humidity meter for measuring the humidity inside the oven is arranged outside the oven.

As an improvement of the technical scheme, the sealing door comprises a door plate and an annular elastic tube, wherein an annular groove matched with the elastic tube is formed in one side, close to the inlet and the outlet, of the door plate, the elastic tube is arranged between the bottom of the annular groove and the head side of the oven, a connecting tube communicated with an air source is arranged outside the elastic tube, and the inner cavity of the connecting tube is communicated with the inner cavity of the elastic tube.

Drying system for switch board tentatively dries the switch board that wets under the environment of low temperature negative pressure earlier stage, and the later stage adopts the desicator to carry out the secondary to remaining aqueous vapor and dries, guarantees that the inside of switch board is dried completely, and it is effectual to dry, and the stoving time is short, and drying efficiency is high, implements effectually.

Drawings

Fig. 1 is a schematic structural view of a drying system for a power distribution cabinet according to the present invention;

fig. 2 is a schematic structural view of the dryer of the present invention;

fig. 3 is a schematic structural view (in a top view) of the circular groove of the present invention;

FIG. 4 is a schematic view of the connection between the stop lever and the vertical tube according to the present invention;

fig. 5 is a schematic view of the sealing door and the oven of the present invention when closed;

fig. 6 is a schematic structural diagram of the sealing door of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the drying system for the power distribution cabinet includes an oven 20 and a sealing door 30 installed outside an end side of the oven 20, wherein an inlet and an outlet 21 matched with the sealing door 30 are formed in the end side of the oven 20, and an electric heating wire 22 is fixedly arranged on an inner wall of the oven 20; the drying system for the power distribution cabinet further comprises a vacuum pump 50 located outside the oven 20 and a dryer 60 located inside the oven 20, wherein a first air valve 51 is arranged between the air exhaust end of the vacuum pump 50 and the inner cavity of the oven 20, one end of the first air valve 51 is communicated with the air exhaust end of the vacuum pump 50, and the other end of the first air valve 51 is communicated with the inner cavity of the oven 20; a second air valve 24 is arranged outside the oven 20, and one end of the second air valve 24 is communicated with the inner cavity of the oven 20.

As shown in fig. 2 to 4, the dryer 60 includes a cylindrical vertical cylinder 61, a sealing cover 62 disposed at the lower end of the vertical cylinder 61, a desiccant layer 63 disposed inside the vertical cylinder 61, an annular electromagnet 64 disposed inside the vertical cylinder 61, a disc-shaped permanent magnet 65 adapted to the inner wall of the vertical cylinder 61, and a circular groove 66 sleeved outside the vertical cylinder 61, wherein the sealing cover 62 is in threaded connection with the lower end of the vertical cylinder 61, the electromagnet 64 is disposed above the desiccant layer 63, the outer ring of the electromagnet 64 is fixedly connected with the inner wall of the vertical cylinder 61, and the permanent magnet 65 is disposed above the electromagnet 64; the inner diameter of the circular groove 66 is larger than the outer diameter of the vertical cylinder 61, a through hole 661 matched with the outer side wall of the vertical cylinder 61 is arranged at the bottom of the circular groove 66, and the outer side wall of the upper end of the vertical cylinder 61 is hermetically connected with the hole wall of the through hole 661; a plurality of blocking rods 67 positioned outside the permanent magnet 65 are arranged above the vertical cylinder 61, the axial direction of the blocking rods 67 is parallel to the axial direction of the vertical cylinder 61, the lower end of each blocking rod 67 is fixedly connected with the upper end of the vertical cylinder 61, and the blocking rods 67 are all arranged inside the circular grooves 66.

Further, the inner diameter of the vertical cylinder 61 is in clearance fit with the diameter of the permanent magnet 65.

Further, a pressure vacuum gauge 23 for measuring the air pressure inside the oven 20 is provided outside the oven 20.

Further, a humidity meter 40 for measuring the humidity inside the oven 20 is provided outside the oven 20.

Further, to improve the sealing property; an annular gasket 68 is arranged between the permanent magnet 65 and the electromagnet 64, and the gasket 68 is fixedly connected with the electromagnet 64.

In the using process of the drying system for the power distribution cabinet, the damp power distribution cabinet 10 is carried by the movable trolley, the sealing door 30 is opened and penetrates through the inlet and outlet 21, and the damp power distribution cabinet 10 is carried into the oven 20 to be placed; then, closing the sealing door 30, closing the second air valve 24, starting the vacuum pump 50, opening the first air valve 51, and continuously exhausting the inside of the oven 20 by the vacuum pump 50 so that the air pressure inside the oven 20 is between-0.04 and-0.03 Mpa, wherein the air pressure inside the oven 20 is smaller than the external atmospheric pressure; then, electrifying the heating wire 22 to heat the inside of the oven 20 until the temperature inside the oven 20 is 55-60 ℃; in the heating process, because the water stain inside the damp power distribution cabinet 10 can be volatilized continuously, and the vacuum pump 50 runs continuously, the air pressure inside the oven 20 is kept at-0.04 to-0.03 MPa all the time; because the drying is carried out in a negative pressure state, the boiling point of water is far less than 100 ℃, which is beneficial to improving the drying rate; the inside humidity of oven 20 can be looked over to the mode of observing humidity table 40, after drying 3 ~ 4h, if the inside humidity of oven 20 is less than or equal to 50%, if continue to adopt single heating stoving mode to remove water, because follow-up steam content is low, continue to heat drying efficiency low, need start-up desicator 60 this moment, desicator 60 adopts the mode of chemical drying, and the process is as follows: when the dryer 60 is not started, the permanent magnet 65 falls to the gasket 68 under the action of gravity, the gasket 68 can be made of rubber, and under the blocking of the gasket 68, external moisture communicated with the circular groove 66 can be effectively prevented from entering the area near the drying agent layer 63; when the dryer 60 is started, the electromagnet 64 is electrified to generate a magnetic force which is repellent to the permanent magnet 65, and as the inner diameter of the vertical cylinder 61 is in clearance fit with the diameter of the permanent magnet 65, the three blocking rods 67 are positioned outside the permanent magnet 65, so that the permanent magnet 65 can only move upwards or downwards under the limitation of the blocking rods 67 in the process of moving upwards under the action of the magnetic force; when the permanent magnet 65 moves upwards until the bottom of the permanent magnet 65 is higher than the bottom of the circular groove 66, at the moment, the inner cavity of the circular groove 66 is communicated with the inner cavity of the vertical cylinder 61, moisture in the oven 20 can be sequentially passed through the inner cavity of the circular groove 66, the through hole 661, the inner ring of the gasket 68 and the inner ring of the electromagnet 64, and finally the moisture in the moisture can be absorbed by the desiccant layer 63, the desiccant layer 63 can be paved by quicklime, the moisture in the oven 20 can be rapidly reduced under the absorption of the desiccant layer 63, until the humidity in the oven 20 is less than or equal to 30%, the electromagnet 64 is powered off, the electromagnet 64 falls to the gasket 68, and the dryer 60 can not absorb the moisture under the separation of the electromagnet 64 and the gasket 68; the electric heating wire 22 is powered off, the vacuum pump 50 is closed, and the first air valve 51 is closed; after the temperature in the oven 20 is reduced to the room temperature, the second air valve 24 is opened to restore the air pressure in the oven 20 to the normal pressure, the sealing door 30 is opened to remove the power distribution cabinet 10 which is dried in the oven 20, and the drying operation is finished. When a new desiccant needs to be replaced, the cover 62 is opened, and the desiccant bed 63 is poured out from the lower end of the vertical cylinder 61 and then replaced.

Further, a cross bar 671 for blocking the permanent magnet 65 is fixedly arranged at the upper end of the stopper rod 67, and the cross bar 671 is perpendicular to the stopper rod 67. The rail 671 is capable of blocking the permanent magnet 65 when the permanent magnet 65 is moved upward by the operation of the magnetic force, preventing the permanent magnet 65 from being disengaged from the region defined by the stopper 67.

Further, as shown in fig. 5 and 6, the sealing door 30 includes a door panel 31 and an annular elastic tube 32, an annular groove matched with the elastic tube 32 is formed in one side of the door panel 31 close to the inlet/outlet 21, the elastic tube 32 is arranged between the bottom of the annular groove and the head side of the oven 20, a connecting tube 33 communicated with an air source is arranged outside the elastic tube 32, and an inner cavity of the connecting tube 33 is communicated with an inner cavity of the elastic tube 32.

The door plate 31 can be driven by a hydraulic cylinder or a pneumatic cylinder, a chute matched with the door plate 31 can be arranged on the ground, and the door plate 31 completely covers the inlet and the outlet 21 to complete door closing operation or the door plate 31 leaves the inlet and the outlet 21 to complete door opening operation under the drive of the hydraulic cylinder or the pneumatic cylinder. When the door panel 31 completely covers the inlet and outlet 21, the air source is an air pump, the air pump is started to inflate the elastic tube 32 through the connecting tube 33, the elastic tube 32 can be a rubber tube, and after the elastic tube 32 is inflated, a gap between the door panel 31 and the front side of the oven 20 is blocked, so that the inlet and outlet 21 is closed, and the sealing performance is good. When the sealing door 30 needs to be opened, the air pump is closed, the evacuation valve connected with the connecting pipe 33 can be arranged again, the evacuation valve is opened to evacuate the air in the elastic pipe 32, and at the moment, the door panel 31 is moved again to enable the inlet and outlet 21 not to be covered by the door panel 31 any more, so that the opening operation of the sealing door 30 is completed.

In the above embodiment, the drying system for the power distribution cabinet performs preliminary drying on the damp power distribution cabinet 10 in a low-temperature negative-pressure environment in the earlier stage, so that even if the structure inside the power distribution cabinet 10 is very compact, water vapor inside the power distribution cabinet 10 can be quickly discharged under the action of negative pressure; the dryer 60 is adopted to dry the residual water vapor again in the later period, so that the humidity in the oven 20 can reach less than or equal to 30% within about 1 hour, and the humidity in the oven 20 is kept in the range, namely the inside of the power distribution cabinet 10 is completely dried, and the drying effect is good; after the total drying time of the power distribution cabinet 10 is 3-6 hours, the drying time is short, and the drying efficiency is high; the dryer 60 is simple to use, convenient to replace the drying agent and good in implementation effect.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a drying system for switch board, includes oven (20), installs sealing door (30) at oven (20) head side outside, the head side of oven (20) is provided with and exports (21) with sealing door (30) assorted, the inner wall of oven (20) has set firmly heating wire (22), its characterized in that: the drying device is characterized by further comprising a vacuum pump (50) located outside the drying oven (20) and a dryer (60) located inside the drying oven (20), wherein a first air valve (51) is arranged between the air exhaust end of the vacuum pump (50) and the inner cavity of the drying oven (20), one end of the first air valve (51) is communicated with the air exhaust end of the vacuum pump (50), and the other end of the first air valve (51) is communicated with the inner cavity of the drying oven (20); a second air valve (24) is arranged outside the oven (20), and one end of the second air valve (24) is communicated with the inner cavity of the oven (20).

2. The drying system for the power distribution cabinet according to claim 1, characterized in that: the dryer (60) comprises a cylindrical vertical cylinder (61), a sealing cover (62) arranged at the lower end of the vertical cylinder (61), a drying agent layer (63) positioned in the vertical cylinder (61), a circular electromagnet (64) positioned in the vertical cylinder (61), a circular permanent magnet (65) matched with the inner wall of the vertical cylinder (61), and a circular groove (66) sleeved outside the vertical cylinder (61), wherein the sealing cover (62) is in threaded connection with the lower end of the vertical cylinder (61), the electromagnet (64) is arranged above the drying agent layer (63), the outer ring of the electromagnet (64) is fixedly connected with the inner wall of the vertical cylinder (61), and the permanent magnet (65) is arranged above the electromagnet (64); a through hole (661) matched with the outer side wall of the vertical cylinder (61) is formed in the bottom of the circular groove (66), and the outer side wall of the upper end of the vertical cylinder (61) is connected with the hole wall of the through hole (661) in a sealing mode; a plurality of baffle rods (67) positioned outside the permanent magnet (65) are arranged above the vertical cylinder (61), the axial direction of the baffle rods (67) is parallel to the axial direction of the vertical cylinder (61), the lower ends of the baffle rods (67) are fixedly connected with the upper end of the vertical cylinder (61), and the baffle rods (67) are arranged inside the circular groove (66).

3. The drying system for the power distribution cabinet according to claim 2, characterized in that: an annular gasket (68) is arranged between the permanent magnet (65) and the electromagnet (64), and the gasket (68) is fixedly connected with the electromagnet (64).

4. The drying system for the power distribution cabinet according to claim 2, characterized in that: the upper end of the blocking rod (67) is fixedly provided with a cross rod (671) used for blocking the permanent magnet (65), and the cross rod (671) is perpendicular to the blocking rod (67).

5. The drying system for the power distribution cabinet according to claim 2, characterized in that: the inner diameter of the vertical cylinder (61) is in clearance fit with the diameter of the permanent magnet (65).

6. The drying system for the power distribution cabinet according to claim 1, characterized in that: and a pressure vacuum gauge (23) for measuring the air pressure in the oven (20) is arranged outside the oven (20).

7. The drying system for the power distribution cabinet according to claim 1, characterized in that: the outside of the oven (20) is provided with a hygrometer (40) for measuring the humidity inside the oven (20).

8. The drying system for the power distribution cabinet according to claim 1, characterized in that: the sealing door (30) comprises a door plate (31) and an annular elastic tube (32), wherein an annular groove matched with the elastic tube (32) is formed in one side, close to the inlet and the outlet (21), of the door plate (31), the elastic tube (32) is arranged between the groove bottom of the annular groove and the head side of the oven (20), a connecting tube (33) communicated with an air source is arranged outside the elastic tube (32), and the inner cavity of the connecting tube (33) is communicated with the inner cavity of the elastic tube (32).