Multi-section frequency modulation device for thermal power generating unit

Abstract

The multi-section frequency modulation device for the thermal power generating unit relates to the technical field of power generation and comprises a mounting box, a mounting opening is formed in the side face of the mounting box, an outer side plate is movably arranged on the mounting opening, and an upper heat dissipation cavity and a lower heat dissipation cavity are formed in the top face and the bottom face of the mounting box; an upper fan and a lower fan are respectively arranged in the upper heat dissipation cavity and the lower heat dissipation cavity; the heat dissipation box comprises a main box body and an inner side plate, the main box body is arranged on the inner bottom face of the installation box, a heat dissipation opening is formed in the side face, facing the installation opening, of the main box body, the inner side plate is detachably arranged on the heat dissipation opening, and a device body is installed in a heat dissipation cavity in the heat dissipation box. The efficient heat dissipation effect is guaranteed, the device body can be installed and overhauled in a side opening mode, and the operation convenience is greatly improved.

Description

Technical Field

[0001] This application relates to the technical field of power generation, and particularly to a multi-stage frequency modulation device for thermal power units. Background Art

[0002] A thermal power unit is a device that uses steam generated by a boiler to drive a steam turbine to generate electricity. Therefore, the power generation situation of a thermal power unit completely depends on the steam generation situation. For a thermal power unit, an important function is to adjust the power generation frequency according to the needs of the power grid. When the frequency requirement of the power grid changes, the thermal power unit needs to adjust the steam output so that the steam turbine operates under the required working conditions, thereby meeting the power generation frequency requirement of the power grid. This function is called primary frequency modulation.

[0003] Due to the relatively high temperature in the power plant, it is necessary to effectively dissipate the heat of the frequency modulation device to ensure that the frequency modulation device can work stably for a long time. For example, the Chinese utility model patent CN212627173U discloses a multi-stage frequency modulation device for thermal power units, which is provided with fans on both the left and right sides of the device main body, and the rotation directions of the two fans are opposite, so that the heat generated by the device main body can be quickly discharged.

[0004] However, after the above patent is provided with fans on both the left and right sides of the device main body, the space on both sides of the device main body is very narrow, which brings inconvenience to the installation and maintenance of the device main body. Summary of the Utility Model

[0005] The embodiment of this application provides a multi-stage frequency modulation device for thermal power units to solve the problem in the prior art that the installation and maintenance are inconvenient due to the setting of fans on both the left and right sides of the device main body.

[0006] The embodiment of this application provides a multi-stage frequency modulation device for thermal power units, including:

[0007] An installation box, the side of the installation box has an installation opening, an outer plate is movably arranged on the installation opening, the top inner part and the bottom inner part of the installation box respectively have an upper heat dissipation cavity and a lower heat dissipation cavity, an upper fan and a lower fan are respectively rotatably arranged in the upper heat dissipation cavity and the lower heat dissipation cavity, and a plurality of heat dissipation holes are arranged on the top surface and the bottom surface of the upper heat dissipation cavity and the lower heat dissipation cavity;

[0008] A heat dissipation box, including a main box body and an inner side plate, the main box body is arranged on the inner bottom surface of the installation box, the main box body is provided with a heat dissipation opening on the side facing the installation opening, the inner side plate is detachably arranged on the heat dissipation opening, main fins and side fins extending in the vertical direction are respectively arranged on the main box body and the inner side plate, and a device main body is installed in the heat dissipation cavity inside the heat dissipation box.

[0009] In a possible implementation, a driving motor is provided on the outer top surface of the installation box. There is a driving cavity inside one side surface of the installation box. The driving shaft of the driving motor extends into the driving cavity and is in transmission connection with the upper fan and the lower fan.

[0010] In a possible implementation, the rotating shaft of the upper fan is in transmission connection with the driving shaft through an upper belt, and the rotating shaft of the lower fan is in transmission connection with the driving shaft through a lower belt.

[0011] In a possible implementation, a plurality of coaxial support bearings are provided inside the driving cavity, and the driving shaft sequentially passes through the plurality of support bearings.

[0012] In a possible implementation, a plurality of legs are provided on the outer bottom surface of the installation box.

[0013] In a possible implementation, the outer side plate is rotatably mounted on the installation opening through a pin shaft, or the outer side plate is detachably mounted on the installation opening through a screw.

[0014] In a possible implementation, the inner side plate is detachably mounted on the heat dissipation opening through a screw.

[0015] In a possible implementation, the main box body, the main fins, the inner side plate and the side fins are all made of metal. A sealing strip is provided on the heat dissipation opening, and the sealing strip is made of conductive rubber.

[0016] A multi-stage frequency modulation device for a thermal power unit in the present application has the following advantages:

[0017] Two fans are arranged below and above the device main body, and a heat dissipation plate with a large number of fins is arranged outside the device main body. When the fans rotate, the air below can be driven to the heat dissipation plate, and the heat generated by the heat dissipation plate can be dissipated from the upper fan. This not only ensures an efficient heat dissipation effect, but also allows the device main body to be installed and maintained in a side-opening manner, greatly improving the operation convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 FIG. 33 is a schematic three-dimensional structure diagram of a multi-stage frequency modulation device for a thermal power unit provided by an embodiment of the present application;

[0020] Figure 2 FIG. 37 is a schematic structure diagram of a heat dissipation box provided by an embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of the internal structure of a multi-stage frequency modulation device for a thermal power unit provided by this application.

[0022] Explanation of the reference numerals in the attached drawings: 100, installation box; 1001, drive cavity; 1002, upper heat dissipation cavity; 1003, lower heat dissipation cavity; 1004, upper fan; 1005, lower fan; 1006, upper belt; 1007, lower belt; 101, leg; 102, drive motor; 1020, drive shaft; 1021, support bearing; 110, installation cavity; 200, outer plate; 300, heat dissipation box; 310, main box body; 311, heat dissipation cavity; 312, main fin; 320, inner plate; 321, side fin; 330, device main body. Specific embodiments

[0023] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0024] Figures 1-3 This is a schematic diagram of the structure of a multi-stage frequency modulation device for a thermal power unit provided by an embodiment of this application. An embodiment of this application provides a multi-stage frequency modulation device for a thermal power unit, including:

[0025] An installation box 100, the side of the installation box 100 has an installation opening, an outer plate 200 is movably arranged on the installation opening, the inner part of the top surface and the inner part of the bottom surface of the installation box 100 respectively have an upper heat dissipation cavity 1002 and a lower heat dissipation cavity 1003, an upper fan 1004 and a lower fan 1005 are respectively rotatably arranged in the upper heat dissipation cavity 1002 and the lower heat dissipation cavity 1003, and a plurality of heat dissipation holes are arranged on the top surface and the bottom surface of the upper heat dissipation cavity 1002 and the lower heat dissipation cavity 1003;

[0026] A heat dissipation box 300, including a main box body 310 and an inner plate 320, the main box body 310 is arranged on the inner bottom surface of the installation box 100, the main box body 310 is provided with a heat dissipation opening on the side facing the installation opening, the inner plate 320 is detachably arranged on the heat dissipation opening, the main box body 310 and the inner plate 320 are respectively provided with main fins 312 and side fins 321 extending in the vertical direction, and a device main body 330 is installed in the heat dissipation cavity 311 inside the heat dissipation box 300.

[0027] Exemplarily, the upper fan 1004 and the lower fan 1005 rotate in the same direction and can both convey the air below upward. Therefore, after fans are provided both below and above the heat dissipation box 300, the cooler air at the outer bottom of the installation box 100 can be conveyed into the installation cavity 110 by the lower fan 1005. Since both the main fins 312 and the side fins 321 are in the vertical direction, the air can flow upward along the fins. During the flowing process, the fins will have sufficient heat exchange with the air, thereby increasing the temperature of the air. At this time, the density of the air will decrease. Therefore, under the action of the density difference and the upper fan 1004, it can be quickly discharged from the top of the installation box 100, achieving the purpose of dissipating heat from the heat dissipation box 300. Moreover, since the outer side plate 200 and the inner side plate 320 both face the same side, when both the outer side plate 200 and the inner side plate 320 are opened, the device main body 330 in the heat dissipation cavity 311 can be exposed. At this time, there is no obstruction inside both the installation cavity 110 and the heat dissipation cavity 311, and the installation and maintenance work of the device main body 330 can be carried out very conveniently.

[0028] In the embodiment of the present application, a plurality of legs 101 are provided on the outer bottom surface of the installation box 100. The legs 101 can keep a certain distance between the outer bottom surface of the installation box 100 and the ground, which can not only effectively reduce the wear on the surface of the installation box 100, but also enable the air to smoothly enter the lower heat dissipation cavity 1003 through the heat dissipation holes.

[0029] Furthermore, a dust-proof net can be provided in the lower heat dissipation cavity 1003 to intercept the dust entering the lower heat dissipation cavity 1003 along with the air and reduce the amount of dust entering the installation cavity 110.

[0030] Furthermore, the outer side plate 200 is rotationally installed on the installation opening through a pin shaft, or the outer side plate 200 is detachably installed on the installation opening through screws. When installed by a pin shaft, the pin shaft needs to be vertically fixed on the left or right edge of the installation opening, and a rotating sleeve needs to be provided on the corresponding edge of the outer side plate 200. After the rotating sleeve is rotationally inserted outside the pin shaft, the outer side plate 200 can be opened or closed on the installation opening. It should be understood that simply installing the outer side plate 200 by a pin shaft cannot ensure that the outer side plate 200 is tightly connected to the installation opening. Therefore, even if a pin shaft is used, bolts are needed to tightly connect the closed outer side plate 200 to the installation opening.

[0031] Furthermore, the inner side plate 320 is detachably installed on the heat dissipation opening through screws. In addition to the screw installation method, a magnetic attraction method can also be adopted, that is, a plurality of or a circle of magnets are provided on the surfaces of the heat dissipation opening and the inner side plate 320, and the inner side plate 320 is stably connected to the heat dissipation opening by the attraction of different magnetic poles.

[0032] Since the electromagnetic environment in the power plant is relatively complex, in order to prevent the external electromagnetic field from affecting the operation of the device body 330, the main box 310, main fins 312, inner plate 320 and side fins 321 in this application are all made of metal, and a sealing strip is provided on the heat dissipation opening, and the sealing strip is made of conductive rubber. The use of metal materials can not only shield the magnetic field, but also has a high heat conduction efficiency, thereby improving the heat dissipation effect. The sealing strip can effectively fill the gap between the inner plate 320 and the heat dissipation opening, further improving the electromagnetic shielding effect.

[0033] In a possible embodiment, a driving motor 102 is provided on the outer top surface of the installation box 100, and a driving cavity 1001 is provided inside one side of the installation box 100. The driving shaft 1020 of the driving motor 102 extends into the driving cavity 1001 and is transmission-connected to the upper fan 1004 and the lower fan 1005.

[0034] Exemplarily, the rotating shaft of the upper fan 1004 is connected to the driving shaft 1020 through an upper belt 1006 , and the rotating shaft of the lower fan 1005 is connected to the driving shaft 1020 through a lower belt 1007 .

[0035] In addition to belt drive, gear drive can also be used, that is, gears are provided on both the drive shaft 1020 and the rotating shaft of the fan, and one or more gears are provided between the two gears, and these gears are meshed in sequence so that the power of the drive shaft 1020 can be transmitted to the fan. However, since the distance between the drive shaft 1020 and the rotating shaft of the fan is relatively large, the use of gear drive will result in a larger diameter or a larger number of gears, so belt drive is a better way.

[0036] When using belt drive, a belt with meshing teeth can be used, and gears can also be set on the fan shaft and the drive shaft 1020. Using this belt can effectively ensure that there is no slippage between the belt and the drive shaft 1020 and the shaft.

[0037] Furthermore, since the same drive shaft 1020 is used to drive the upper fan 1004 and the lower fan 1005, the length of the drive shaft 1020 is relatively long. In order to prevent the drive shaft 1020 from being deformed due to the pulling of the belt, a plurality of coaxial support bearings 1021 are provided inside the drive cavity 1001, and the drive shaft 1020 sequentially passes through the plurality of support bearings 1021. After the support bearings 1021 are used, it can be ensured that the drive shaft 1020 is vertically located in the drive cavity 1001 and will not be deformed.

[0038] Although the preferred embodiments of the present application have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once they learn of the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present application.

[0039] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. A multi-stage frequency modulation device for a thermal power unit, characterized in that: include: An installation box (100), wherein a side surface of the installation box (100) is provided with an installation opening, an outer plate (200) is movably arranged on the installation opening, an upper heat dissipation cavity (1002) and a lower heat dissipation cavity (1003) are respectively arranged inside the top surface and inside the bottom surface of the installation box (100), an upper fan (1004) and a lower fan (1005) are respectively rotatably arranged in the upper heat dissipation cavity (1002) and the lower heat dissipation cavity (1003), and a plurality of heat dissipation holes are arranged on the top surface and the bottom surface of the upper heat dissipation cavity (1002) and the lower heat dissipation cavity (1003); A heat dissipation box (300) comprises a main box body (310) and an inner side plate (320), wherein the main box body (310) is arranged on the inner bottom surface of the installation box (100), the main box body (310) is provided with a heat dissipation opening on the side facing the installation opening, the inner side plate (320) is detachably arranged on the heat dissipation opening, the main box body (310) and the inner side plate (320) are respectively provided with main fins (312) and side fins (321) extending in the vertical direction, and a device body (330) is installed in a heat dissipation cavity (311) inside the heat dissipation box (300).

2. A multi-stage frequency modulation device for a thermal power unit according to claim 1, characterized in that: A driving motor (102) is disposed on the outer top surface of the installation box (100), and a driving cavity (1001) is provided inside one side surface of the installation box (100). A driving shaft (1020) of the driving motor (102) extends into the driving cavity (1001) and is drivingly connected to the upper fan (1004) and the lower fan (1005).

3. A multi-stage frequency modulation device for a thermal power unit according to claim 2, characterized in that: The rotating shaft of the upper fan (1004) is connected to the driving shaft (1020) via an upper belt (1006), and the rotating shaft of the lower fan (1005) is connected to the driving shaft (1020) via a lower belt (1007).

4. A multi-stage frequency modulation device for a thermal power unit according to claim 2, characterized in that: A plurality of coaxial support bearings (1021) are arranged inside the driving cavity (1001), and the driving shaft (1020) passes through the plurality of support bearings (1021) in sequence.

5. A multi-stage frequency modulation device for a thermal power unit according to claim 1, characterized in that: A plurality of supporting legs (101) are arranged on the outer bottom surface of the installation box (100).

6. A multi-stage frequency modulation device for a thermal power unit according to claim 1, characterized in that: The outer plate (200) is rotatably mounted on the mounting opening via a pin shaft, or the outer plate (200) is detachably mounted on the mounting opening via screws.

7. A multi-stage frequency modulation device for a thermal power unit according to claim 1, characterized in that: The inner plate (320) is detachably mounted on the heat dissipation opening by means of screws.

8. A multi-stage frequency modulation device for a thermal power unit according to claim 7, characterized in that: The main box body (310), the main fins (312), the inner plate (320) and the side fins (321) are all made of metal, and a sealing strip is provided on the heat dissipation opening, and the sealing strip is made of conductive rubber.

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