CN115987058A

CN115987058A - Positive-pressure explosion-proof frequency converter

Info

Publication number: CN115987058A
Application number: CN202211689954.9A
Authority: CN
Inventors: 秦忠根; 樊宗山; 汪明剑; 田华明; 徐晨; 贾锋
Original assignee: Huainan Wantai Electric Co ltd
Current assignee: Huainan Wantai Electric Co ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-04-18

Abstract

The invention discloses a positive-pressure explosion-proof frequency converter, and relates to the technical field of mining frequency converter boxes. The explosion-proof frequency converter comprises a box body, wherein a front door is arranged on one side of the box body, and a window mechanism is arranged on the front surface of the front door and used for checking the reading of a frequency converter instrument in the box body; one side in the box body is fixedly connected with an air box, an air suction fan is arranged in the air box, and an exhaust pipe is arranged on one side of the box body; one side of the box body far away from the front door is provided with a plurality of maintenance mechanisms, and the maintenance mechanisms are used for maintaining a frequency converter inside the box body. According to the invention, the window mechanism is arranged on the front side of the box body, the reading of the frequency converter instrument in the box body is checked in advance to judge a fault point, then the frequency converter in the box body is overhauled by the overhauling mechanism arranged on the back side of the box body, and the air suction fan is used for discharging coal dust in the box body, so that the risk of coal dust remaining in the box body is reduced comprehensively, and the explosion-proof effect of the device is improved.

Description

Positive-pressure explosion-proof frequency converter

Technical Field

The invention relates to the technical field of mining frequency converter boxes, in particular to a positive-pressure explosion-proof frequency converter.

Background

The production condition in the mine is complicated, often can be accompanied with the flammable gas such as methane appearing in the exploitation in-process, when the coal dust in the air reaches a certain amount in the well simultaneously, the air is in inflammable and explosive state, and the construction machine is the heavy machinery that power consumption is big in the well, the event need assemble the converter in the distribution process, prevent that overvoltage, the condition such as overload from appearing in the consumer, when using the converter, for preventing the direct contact of the inflammable and explosive air in electric spark and the construction environment that the converter during operation produced, need carry out explosion-proof treatment to the converter.

The patent specification with the publication number of CN104124856B discloses a mining voltage type high-voltage explosion-proof frequency converter, which comprises a shell, wherein a plurality of reinforcing ribs are arranged on the outer wall and the inner wall of the shell; a plurality of partition plates are arranged in the shell; the inner space of the shell is divided into a first secondary loop chamber, a second secondary loop chamber and a water cooling system chamber by a plurality of partition plates; the water cooling device comprises an internal part and an external part, wherein the internal part is arranged in the water cooling system chamber, and the external part is arranged outside the shell; the internal part comprises an explosion-proof valve, a water distribution pipe and a water return pipe; the external part comprises a radiator, a deionization exchanger and a pump set. This frequency converter has some disadvantages: firstly, when the frequency converter is in use and needs to be overhauled when a fault occurs, primary judgment cannot be carried out through external observation; secondly, because the whole protection level of the casing of explosion-proof frequency converter is higher, so open the step comparatively loaded down with trivial details, when needs carry out actual maintenance, this frequency converter must thoroughly open and overhaul, leads to the maintenance process comparatively complicated.

Disclosure of Invention

In order to overcome the technical problems, the invention aims to provide a positive-pressure explosion-proof frequency converter.

The purpose of the invention can be realized by the following technical scheme:

a positive-pressure explosion-proof frequency converter comprises a box body, wherein a front door is installed on one side of the box body, a window mechanism is arranged on the front face of the front door, and the window mechanism is used for checking the reading of a frequency converter instrument in the box body; one side in the box body is fixedly connected with an air box, an air suction fan is arranged in the air box, and an exhaust pipe is arranged on one side of the box body; one side that the box was kept away from the qianmen is provided with a plurality of maintenance mechanism, maintenance mechanism is used for overhauing the inside converter of box.

As a further scheme of the invention: the front door and the adjacent side of the box body are fixedly connected with a first airtight rubber strip along the edge, the front door is provided with a first sealing groove corresponding to the first airtight rubber strip, and the first airtight rubber strip is embedded with the first sealing groove.

As a further scheme of the invention: the window mechanism comprises a window frame, a window is fixedly connected to the window frame, a first hinge is fixedly connected to one side of the window frame, and the other end of the first hinge is rotatably connected with a window cover body.

As a further scheme of the invention: the air box is close to one side of the center of the box body, a plurality of air passing holes are uniformly formed in one side of the air box, the air box is far away from one side of the air passing holes, an air outlet is formed in the box body, and one end of the exhaust pipe is fixedly connected with the air outlet.

As a further scheme of the invention: the wire passing pipe box is characterized in that a plurality of wire passing pipes are evenly arranged at the top end of the box body, the wire passing pipes penetrate through the box body and extend to the interior of the box body, and a wire barrel is installed at the top of each wire passing pipe.

As a further scheme of the invention: the maintenance mechanism is including fixed connection in a plurality of access hole of box one side, each hinge two is all installed to access hole one side, hinge two in the other end of access hole rotates and is connected with the access cover, the access hole with the access cover all evenly is provided with a plurality of bolt interface along the edge, the access hole with two that the access cover is adjacent install fastening bolt between the bolt interface.

As a further scheme of the invention: and one side of the access hole is fixedly connected with a second airtight rubber strip along the edge, one side of the access cover is provided with a second sealing groove, and the second airtight rubber strip and the second sealing groove are mutually embedded.

As a further scheme of the invention: the window cover body and the window frame are both provided with a plurality of bolt holes along the edge; and a handle is fixedly connected to the middle of one side of the outer part of the box body.

The invention has the beneficial effects that:

1. in the invention, in the working process of the frequency converter, the air suction fan arranged in the air box discharges heat generated in the box body and a small amount of existing coal ash from the exhaust pipe through the air through holes, so that the air circulation in the box body is improved, the probability of the coal ash remaining in the box body is reduced, namely the possibility of explosion of the coal ash when electric sparks are generated is reduced, and a certain heat dissipation function is realized.

2. After converter work a period, there is the possibility of breaking down, when breaking down, at first need carry out data anomaly to the reading of each instrument and meter of converter and judge, at this moment, need not open box and qianmen, only need open window frame of window mechanism, corresponding reading in the box is observed through the window, thereby judge the fault point and appear the position, open the box when avoiding preliminary judgement, reduce the possibility of the inside space contact exterior space of converter, improve explosion-proof performance.

3. After finishing looking over, the staff reachs the fault point through judging, then, the access hole through the maintenance mechanism of opening the relevant position at box back then can overhaul the operation fast in the box, avoids opening box and qianmen on a large scale equally, improves the security of maintenance process, further reduces the possibility that the coal dust got into in the box, and the a small amount of coal dust that gets into also can in time be discharged through the fan of breathing in 7, convenience and security when improving the converter and overhauing.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the backside structure of the present invention;

FIG. 3 is a view of the open state of the cover of the window of the present invention;

FIG. 4 is an open state diagram of the present invention;

FIG. 5 is a schematic view of a construction of a windbox of the present invention with one side plate removed;

FIG. 6 is an open view of the back side servicing mechanism of the present invention;

FIG. 7 is an enlarged detail view of FIG. 4 at A;

FIG. 8 is an enlarged detail view at B of FIG. 5 in accordance with the present invention;

fig. 9 is an enlarged view of a detail C of fig. 6 of the present invention.

In the figure: 1. a box body; 2. a front door; 3. a first airtight rubber strip; 4. a first sealing groove; 5. a window mechanism; 51. a window frame; 52. a window; 53. a first hinge; 54. a window cover body; 6. an air box; 7. an air suction fan; 8. air passing holes; 9. an exhaust port; 10. an exhaust pipe; 11. a wire passing pipe; 12. a bobbin; 13. a maintenance mechanism; 131. an access hole; 132. a second hinge; 133. an access cover; 134. a bolt interface; 135. fastening a bolt; 136. a second airtight rubber strip; 137. and a second sealing groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 9, the positive pressure explosion-proof frequency converter comprises a box body 1, wherein a front door 2 is connected to the front side of the box body 1 in a rotating mode, a large number of bolt hole sites are uniformly arranged on the periphery of the adjacent side of the front door 2 and the shell, corresponding bolts are installed in the bolt hole sites to fix the front door 2 and the box body 1, a handle is fixedly connected to the middle of the front side of the front door 2, the front door 2 is integrally made of steel, so that the weight is heavy, and the opening and closing control of the front door 2 during installation of the internal frequency converter is facilitated through holding of the handle.

As shown in fig. 4 and 7, a first airtight rubber strip 3 is uniformly and fixedly connected to the inner side of the box body 1 along the edge, a first sealing groove 4 is formed in the position, corresponding to the first airtight rubber strip 3, of the adjacent side of the front door 2 and the box body 1, when the front door 2 is in a closed state in conjunction with the box body 1, the first airtight rubber strip 3 seals the first sealing groove 4 to form sealing treatment on the frequency converter, and because the frequency converter is used under a mine, substances such as coal ash and the like need to be prevented from entering the frequency converter through sealing treatment, the probability that electric sparks contact the substances such as the coal ash and the like is effectively reduced, and explosion is avoided.

As shown in fig. 1 and fig. 3 to 5, a window mechanism 5 is arranged on the upper portion of the front side 2, the window mechanism 5 includes a window frame 51 fixedly connected to the upper portion of the front side 2 and far away from one side of the box body 1, a window 52 is fixedly connected to the middle portion of the window frame 51, the window 52 is made of tempered transparent glass, hinges 53 are mounted at the upper end and the lower end of one side of the window frame 51, the hinges 53 are connected to the other side of the window frame 51 in a rotating manner and connected with a window cover 54, the window cover 54 is fixedly connected to the window frame 51 through bolt holes arranged at the edge, when a frequency converter inside the box body 1 fails, an inspector is in maintenance, firstly, reading is needed to be carried out on instrument equipment inside the frequency converter to preliminarily judge whether the frequency converter fails or not and where the frequency converter fails, when the box body 1 and the front side 2 are opened, a large amount of coal ash in a mine is stored inside the frequency converter due to the time, so that when the preliminary judgment is carried out, the preliminary judgment, the data inside of the frequency converter can be preliminarily judged by observing the inside of the frequency converter through the window 54, and the window is avoided being opened to carry out data reading by the frequency converter.

As shown in fig. 1, fig. 5 and fig. 8, one side of the inside of the box body 1 is fixedly connected with the bellows 6, the bellows 6 is fixedly connected with the middle part of one side of the inside of the box body 1, the air suction fans 7 are installed at the upper end and the lower end of the inside of the bellows 6, the baffles are arranged at the four sides of the whole bellows 6, the baffle positioned at one side close to the front door 2 can be disassembled by disassembling screws, the suction fans 7 are installed, a large number of air passing holes 8 are uniformly formed in the plate body at one side of the bellows 6 close to the middle of the inside of the box body 1, the exhaust port 9 is formed at the side of the box body 1 inside the bellows 6, the exhaust pipe 10 is fixedly connected to the outer side of the exhaust port 9, the power of construction electric appliances inside a mine is large, the power consumption of a required frequency converter is large, the box body 1 is in a closed state for improving the explosion-proof capacity, the temperature inside of the box body 1 can be improved in the using process of each electric appliance in the frequency converter, the air circulation can be accelerated by installing the air suction fans 7 in the bellows 6, a large amount of heat generated in the frequency converter is taken away, the service life of the frequency converter is prolonged, the frequency is prolonged, the condition that the frequent maintenance is caused by overhigh temperature of the external dust and the external contact probability of the frequency is reduced.

Five wire passing pipes 11 are evenly distributed on the upper surface of the box body 1, the wire passing pipes 11 penetrate through the box body 1, the wire passing pipes 11 are used for connecting the wire passing pipes of the frequency converter, the wire barrels 12 are mounted on the upper surface of each wire passing pipe 11, the wire barrels 12 are of a closed structure used for sealing a circuit, corresponding sealing rubber rings are arranged inside the wire barrels 12 to seal the wire passing pipes of the frequency converter, all combustible gas and coal dust in a mine are prevented from entering the frequency converter through the wire passing pipes 11, and the sealing effect of the wiring position of the frequency converter is improved.

As shown in fig. 2, fig. 6 and fig. 9, the back of the side of the box 1 far from the front door 2 is uniformly provided with the maintenance mechanism 13, the maintenance mechanism 13 comprises a maintenance opening 131 fixedly connected to the back of the box 1, one side of the maintenance opening 131 is fixedly connected with a second hinge 132, the second hinge 132 is rotatably connected with a maintenance cover 133 at the side far from the maintenance opening 131, the side surfaces of the maintenance cover 133 and the maintenance opening 131 are fixedly connected with bolt interfaces 134 along the circumferential direction, a fastening bolt 135 is installed between two adjacent bolt interfaces 134, when the fault point of the frequency converter is observed through the window mechanism 5, the risk that the frequency converter contacts the air and the coal dust in the mine is increased due to the maintenance of opening, so that the maintenance cover 133 of the maintenance mechanism 13 at the back of the frequency converter can be opened in a small range to realize the quick and convenient maintenance of the internal frequency converter, the maintenance efficiency is improved, and the contact area is reduced.

The adjacent surface fixed connection of access hole 131 and access cover 133 contact has seted up airtight adhesive tape two 136, has seted up seal groove two 137 in the relevant position of access cover 133, and when covering access hole 131 with access cover 133, be the gomphosis state between airtight adhesive tape two 136 and the seal groove two 137, can realize the sealing process to maintenance mechanism 13 through with the construction bolt between the bolt interface 134 afterwards, make the airtight degree of converter in the box 1 before and after the maintenance not influenced.

The working principle of the invention is as follows: when the box body 1 is placed in a mine, fixing bolts are driven into bolt holes on two sides of the bottom end of the back of the box body 1 to fix the box body 1 under the mine, then the frequency converter is installed in the box body 1, and the box body 1 and the front door 2 are fixed through bolts on the edges, so that the frequency converter works normally; after the frequency converter works for a period of time, the possibility of failure exists, when the failure occurs, data abnormity judgment needs to be carried out on readings of all instruments of the frequency converter, at the moment, the box body 1 and the front door 2 do not need to be opened, only the window frame 51 of the window mechanism 5 needs to be opened, and corresponding readings in the box body 1 are observed through the window 52, so that the position of the failure point is judged, the box body 1 is prevented from being opened during primary judgment, the possibility that the space in the frequency converter contacts with the external space is reduced, and the explosion-proof performance is improved; after finishing looking over, the staff reachs the fault point through judging, this moment, the maintenance mouth 131 of maintenance mechanism 13 through the relevant position of opening 1 back of box then can overhaul the operation in the box 1 fast, avoid opening box 1 and qianmen 2 on a large scale equally, improve the security of maintenance process, further reduce the possibility that the coal dust got into in the box 1, and the a small amount of coal dust that gets into also can in time discharge through the suction fan 7, convenience and security when improving the converter and overhauing.

Although one embodiment of the present invention has been described in detail, the description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. A positive-pressure explosion-proof frequency converter comprises a box body (1), wherein a front door (2) is installed on one side of the box body (1), and is characterized in that a window mechanism (5) is arranged on the front side of the front door (2), and the window mechanism (5) is used for checking the reading of a frequency converter instrument in the box body (1); one side inside the box body (1) is fixedly connected with an air box (6), an air suction fan (7) is installed inside the air box (6), and an exhaust pipe (10) is installed on one side of the box body (1); one side of the box body (1) far away from the front door (2) is provided with a plurality of overhauling mechanisms (13), and the overhauling mechanisms (13) are used for overhauling a frequency converter inside the box body (1).

2. The positive-pressure explosion-proof frequency converter according to claim 1, wherein a first airtight rubber strip (3) is fixedly connected to the adjacent side of the front door (2) and the box body (1) along the edge, a first sealing groove (4) is formed in the front door (2) corresponding to the first airtight rubber strip (3), and the first airtight rubber strip (3) and the first sealing groove (4) are mutually embedded.

3. The positive-pressure explosion-proof frequency converter according to claim 1, wherein the window mechanism (5) comprises a window frame (51), a window (52) is fixedly connected to the window frame (51), a first hinge (53) is fixedly connected to one side of the window frame (51), and a window cover (54) is rotatably connected to the other end of the first hinge (53).

4. The positive-pressure explosion-proof frequency converter according to claim 1, wherein a plurality of air passing holes (8) are uniformly formed in one side of the air box (6) close to the center of the box body (1), an air outlet (9) is formed in one side of the air box (6) far away from the air passing holes (8) on the box body (1), and one end of the exhaust pipe (10) is fixedly connected with the air outlet (9).

5. The positive-pressure explosion-proof frequency converter according to claim 1, wherein a plurality of wire passing pipes (11) are uniformly arranged at the top end of the box body (1), the wire passing pipes (11) penetrate through the box body (1) and extend into the box body (1), and a wire barrel (12) is mounted at the top of each wire passing pipe (11).

6. The positive-pressure explosion-proof frequency converter according to claim 1, wherein the maintenance mechanism (13) comprises a plurality of maintenance ports (131) fixedly connected to one side of the box body (1), a second hinge (132) is installed at one side of each maintenance port (131), the second hinge (132) is rotatably connected with a maintenance cover (133) at the other end of the maintenance port (131), the maintenance ports (131) and the maintenance cover (133) are uniformly provided with a plurality of bolt interfaces (134) along the edge, and a fastening bolt (135) is installed between two adjacent bolt interfaces (134) of the maintenance ports (131) and the maintenance cover (133).

7. The positive-pressure explosion-proof frequency converter according to claim 6, wherein a second airtight rubber strip (136) is fixedly connected to one side of the access opening (131) along the edge, a second sealing groove (137) is formed in one side of the access cover (133), and the second airtight rubber strip (136) and the second sealing groove (137) are mutually embedded.

8. The positive-pressure explosion-proof frequency converter according to claim 3, wherein the window cover (54) and the window frame (51) are both provided with a plurality of bolt holes along the edges; a handle is fixedly connected to the middle of one side of the outer portion of the box body (1).