Drawer type cooling fan suitable for dry type exciting transformer of generator excitation system

Abstract

The utility model discloses a drawer-type cooling fan suitable for a dry-type exciting transformer of a generator excitation system, relates to the technical field of the dry-type exciting transformer of the generator excitation system, and aims to solve the problem that when one or more groups of cooling fans break down, if the faulted fan is processed without power failure, the temperature of a winding of the dry-type exciting transformer rises, and the cooling effect is poor. If the temperature possibly exceeds the normal temperature range, the transformer winding material is damaged and the service life is influenced; when one or more groups of cooling fans break down, if the fan breaks down without power failure, a generator set operates at high load, and the temperature of an excitation transformer is too high, the generating capacity of a generator is reduced, so that the temperature rise of the excitation transformer is limited, and the safety production and economic benefits of a power plant are influenced. A dry-type exciting transformer is installed on the bracket, a guide rail is installed on the bracket, a sliding seat is connected to the guide rail in a sliding mode, and the fan is installed on the sliding seat.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of generator excitation system dry type excitation transformer, specifically speaking, it is a drawer type cooling fan suitable for generator excitation system dry type excitation transformer. BACKGROUND

[0002] The safe operation and service life of the dry type excitation transformer depend largely on the safety and reliability of the transformer winding insulation. The destruction of the insulation material caused by the winding temperature exceeding the heat resistance limit of the insulation material is one of the main reasons for the abnormal operation of the transformer. Therefore, the air cooling temperature control system of the transformer is very important. The air cooling system of the dry type excitation transformer winding is composed of six groups of cross-flow cooling fans, which are installed on the high and low voltage sides of the transformer and placed on both sides of the lower part of the transformer coil. The cooling air is directly blown to the high and low voltage side cooling air duct of the transformer, which makes the heat dissipation effect obvious and can guarantee the normal operation of the transformer and prolong its service life.

[0003] The air cooling system of the dry type excitation transformer winding is composed of six groups of cross-flow cooling fans, two groups for each phase, which are installed on the high and low voltage sides of the transformer and placed on both sides of the lower part of the transformer coil. The cooling fan is fixedly installed and cannot be moved, which can provide sufficient cooling air. The fixed installation of the cooling fan has the following disadvantages: when one or more groups of cooling fans fail, if the failed fan is not treated by stopping power supply, the temperature of the dry type excitation transformer winding will rise and may exceed the normal temperature range, which will damage the transformer winding material and affect its service life; when one or more groups of cooling fans fail, if the failed fan is not treated by stopping power supply, the generator set will run under high load, and the high temperature of the excitation transformer will force the generator to reduce the power generation capacity, thereby limiting the temperature rise of the excitation transformer, affecting the safe production and economic benefits of the power plant. SUMMARY

[0004] In view of the shortcomings of the prior art, the utility model aims to provide a drawer type cooling fan suitable for the dry type excitation transformer of the generator excitation system to solve the problem that when one or more groups of cooling fans fail, if the failed fan is not treated by stopping power supply, the temperature of the dry type excitation transformer winding will rise and may exceed the normal temperature range, which will damage the transformer winding material and affect its service life.

[0005] The utility model solves the technical problems by adopting the following technical scheme: a drawer type cooling fan suitable for the dry type excitation transformer of the generator excitation system, comprising a bracket and a fan, a dry type excitation transformer is installed on the bracket, a guide rail is installed on the bracket, a sliding seat is slidably connected to the guide rail, and the fan is installed on the sliding seat.

[0006] Preferably, an insulating baffle is placed on the bracket, and a first mounting hole is formed in the insulating baffle.

[0007] Preferably, the guide rail is provided with a stopper.

[0008] Preferably, the slide seat is detachable, and the slide seat is provided with a first connecting plate, and second mounting holes are formed in two sides of the first connecting plate respectively, and third mounting holes are formed in the slide seat respectively.

[0009] Preferably, the slide seats are connected through a second connecting plate.

[0010] Preferably, a handle is mounted on the slide seat.

[0011] Compared with the prior art, the device has the advantages that:

[0012] The device is improved and upgraded on the basis of the original fixed cooling fan fixed installation technology, adopts a drawer type installation, and has a more flexible and exquisite structure. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic view of the device.

[0014] Figure 2 is a structural schematic view of the fan, guide rail and slide seat.

[0015] Figure 3 is a structural schematic view of the first connecting plate, second mounting hole and third mounting hole.

[0016] Figure 4 is a structural schematic view of the slide seat and second connecting plate.

[0017] Among them:

[0018] 1 - bracket; 2 - dry type excitation transformer; 3 - fan; 4 - guide rail; 5 - slide seat; 6 - insulating baffle; 7 - first mounting hole; 8 - stopper; 9 - first connecting plate; 10 - second mounting hole; 11 - third mounting hole; 12 - second connecting plate; 13 - handle DETAILED DESCRIPTION

[0019] The utility model is further described below in combination with specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the appended claims.

[0020] The components of the utility model are all general standard components or components known to those skilled in the art, and their structures and principles can be known by the technical personnel through technical manuals or through conventional experimental methods.

[0021] Referring to Figures 1-4 The embodiment of the utility model provides a drawer type cooling fan suitable for the dry excitation transformer of the excitation system of the generator, which comprises a bracket 1 and a fan 3, the dry excitation transformer 2 is installed on the bracket 1, the guide rail 4 is installed on the bracket 1, the sliding seat 5 is slidably connected to the guide rail 4, and the fan 3 is installed on the sliding seat 5.

[0022] It should be noted that in the embodiment, the fan 3: 4 sets; the bracket 1: same as the conventional product bracket (the bracket is reversely installed, and the bracket is provided with the fixing hole of the required mounting part), 2 pieces; the guide rail 4: instead of the cross frame of the conventional product, the length is determined according to actual data (as close to the pull-out side shell as possible); the sliding seat 5: installed on the four corner fixing holes of the fan 3, cooperates with the guide rail 4 to slide, 8 pieces, and the adopted mounting relationship is bolted.

[0023] Specifically, when in use, the dry excitation transformer 2 is installed on the bracket 1, the fan 3 is slid on the guide rail 4 through the sliding seat 5, the air outlet of the fan 3 is aligned with the heat dissipation part required by the dry excitation transformer 2, the dry excitation transformer 2 can be cooled, however, the fan 3 can be removed and replaced, and other fans 3 continue to work, so that the fault fan 3 can be processed without stopping the dry excitation transformer 2.

[0024] As a preferred embodiment, the bracket 1 is provided with an insulating baffle 6, the insulating baffle 6 is provided with a first mounting hole 7; the guide rail 4 is provided with a stopper 8; the sliding seat 5 is separated, the sliding seat 5 is provided with a first connecting plate 9, the two sides of the first connecting plate 9 are provided with a second mounting hole 10 respectively, and the sliding seat 5 is provided with a third mounting hole 11 respectively; the sliding seat 5 is connected through a second connecting plate 12; and the sliding seat 5 is provided with a handle 13.

[0025] It should be noted that in this embodiment, the first connecting plate 9 is used to connect the slide 5 of each fan 3 at the four corners, so that the slide 5 becomes a whole; the second connecting plate 12 is used to connect the slide 5 between the two fans 3, so that the two fans 5 become a whole; the stop block 8 is installed on the non-pulling-out side guide rail 4, and is used to limit and fix the fan 3; the handle 13 is installed on the slide of the first fan on the pulling-out side, and is used to push and pull the fan; the insulating baffle 6 is an epoxy plate installed on the beam on the upper part of the side of the shell on the pulling-out side of the fan 3, and is used to limit the operation range of the operator when changing the fan 3, so as to prevent the operator from accidentally stretching the hand into the shell of the dry-type excitation transformer 2 too close to the high-voltage coil (the number of the first connecting plate and the like can be selected according to actual use needs).

[0026] Specifically, in use, the first connecting plate 9 can connect the slide 5 of each fan 3 at the four corners, and the second connecting plate 12 can connect the slide 5 between the two fans 3, which facilitates the assembly work in the early stage and also facilitates the disassembly and maintenance work in the later stage.

[0027] (1) Fan installation during modification:

[0028] a. Reverse installation of the bracket;

[0029] b. Connect the slides with the first connecting plate;

[0030] c. Fix the fan on the slide through the mounting holes at the four corners;

[0031] d. Install the guide rail on the bracket;

[0032] e. Fix the stop block on the guide rail;

[0033] f. Slide the fan one by one through the slide to the guide rail;

[0034] g. Install the second connecting plate between the two fans, install the push-pull handle, and install the grounding bolt;

[0035] h. The rest is the same as the conventional fan installation.

[0036] (2) Fan disassembly during transformer operation: In order to better ensure personal safety, the operator needs to wear insulating gloves for operation.

[0037] a. Cut off the total power supply in the fan temperature controller;

[0038] b. Disassemble the corresponding shell plate on the pulling-out side of the fan;

[0039] c. Prepare suitable support on site for supporting the pulled-out fan;

[0040] d. Remove the fan positioning bolt item one, pull out the fan, when the first fan is pulled to the fan power terminal close to the shell, remove the power line and the fan terminal link, continue to pull the fan, when the fan is pulled out of the shell, remove the connection between the first fan and the second fan item two, at this time the first fan is disassembled, and the second fan is pulled out for replacement by the same method;

[0041] e. After the second fan is replaced, the fan can be installed at this time, first install the second fan on the slider, push it back to the guide rail, connect the power line and the fan terminal after the second fan is pushed into the shell, connect the first fan through item two, and push them into the shell together, connect the terminal of the first fan and the power line, at this time the fan has been pushed into the shell, the positioning bolt item one, the shell plate is installed, and the fan replacement is completed.

[0042] Through the personnel in the field, the parts in the case are connected in turn, the specific connection and operation sequence should be referred to the working principle described below, and the detailed connection means is a well-known technology in the field, and the working principle and process are mainly introduced below.

[0043] The working process and working principle of the utility model: when in use, the dry-type excitation transformer 2 is installed on the bracket 1, the first connecting plate 9 can connect the four corners of each fan 3 and the sliding seat 5, and the second connecting plate 12 can connect the sliding seat 5 between the two fans 3, so that the fan 3 slides and advances on the guide rail 4 through the sliding seat 5, and the air outlet of the fan 3 is aligned with the heat dissipation part of the dry-type excitation transformer 2, so that the dry-type excitation transformer 2 can be cooled and cooled, and the fan 3 can be removed and replaced, and the other fans 3 continue to work, so that the fault fan 3 can be processed when the dry-type excitation transformer 2 is not stopped.

[0044] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A drawer type cooling fan suitable for dry-type excitation transformer of a generator excitation system, comprising a bracket (1) and a fan (3), characterized in that: The bracket (1) is provided with a dry-type excitation transformer (2), the bracket (1) is provided with a guide rail (4), the guide rail (4) is slidably connected with a sliding seat (5), and the fan (3) is installed on the sliding seat (5).

2. A drawer type cooling fan suitable for dry-type excitation transformer of an excitation system of a generator according to claim 1, characterized in that: The bracket (1) is provided with an insulating baffle (6), and the insulating baffle (6) is provided with a first mounting hole (7).

3. A drawer type cooling fan suitable for dry-type excitation transformer of an excitation system of a generator according to claim 1, characterized in that: The guide rail (4) is provided with a stop block (8).

4. A drawer type cooling fan suitable for dry-type excitation transformer of an excitation system of a generator according to claim 1, characterized in that: The sliding seat (5) is detachable, the sliding seat (5) is provided with a first connecting plate (9), the two sides of the first connecting plate (9) are respectively provided with a second mounting hole (10), and the sliding seat (5) is respectively provided with a third mounting hole (11).

5. A drawer type cooling fan suitable for dry-type excitation transformer of an excitation system of a generator according to claim 1, characterized in that: The sliding seat (5) is connected through a second connecting plate (12).

6. A drawer type cooling fan suitable for dry-type excitation transformer of an excitation system of a generator according to claim 1, characterized in that: The sliding seat (5) is provided with a handle (13).

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