CN221427461U

CN221427461U - Brake resistor heat dissipation device

Info

Publication number: CN221427461U
Application number: CN202323231039.8U
Authority: CN
Inventors: 沈刚; 查炜烨; 沈柳锋; 孟旭; 黄利锋
Original assignee: Shanghai Zhenghua Heavy Industries Co Ltd
Current assignee: Shanghai Zhenghua Heavy Industries Co Ltd
Priority date: 2023-11-29
Filing date: 2023-11-29
Publication date: 2024-07-26
Anticipated expiration: 2033-11-29

Abstract

The utility model provides a brake resistor heat dissipation device, which is used for a crane with a machine room, wherein an opening is arranged on the top of the machine room of the crane, and the brake resistor heat dissipation device comprises: the metal box body is of a vertical columnar structure, an air outlet and an air inlet are formed in the shell of the metal box body, a cooling air channel which is communicated with the air outlet and the air inlet is formed in the metal box body, and the air inlet is communicated with the opening; the resistor module is arranged in the cooling air duct and is used for converting electric energy into heat energy; the air cooling motor is arranged at the air inlet and used for conveying air flow in the machine room into the cooling air duct so as to cool the resistor module through the air flow in the machine room. According to the utility model, the opening is arranged on the top of the machine room, and the air in the crane machine room is used for cooling the brake resistor, so that the dryness of the cooling medium is improved, the resistor module is directly cooled, and the working efficiency is improved.

Description

Brake resistor heat dissipation device

Technical Field

The utility model relates to the technical field of brake resistors, in particular to a brake resistor heat dissipation device.

Background

In lifting application scenes such as but not limited to an electrically driven variable frequency crane, frequent energy conversion processes are not separated, particularly when a suspended object descends from a high place, decelerates and stops, a motor is in a power generation state, a large amount of electric energy is accumulated on a busbar to form regenerated electric energy, and the electric energy needs to be released in time to prevent equipment from being damaged due to the fact that the busbar voltage is too high.

A common way of consuming regenerated electrical energy is to feed back the grid and convert it into thermal energy for dissipation in the cooling medium. The former is mostly implemented by an Active Front End (AFE) and other energy feedback units, and is mostly suitable for occasions with larger scale power. The regenerated electric energy can be fully utilized, the technology is advanced, but the production cost and the maintenance cost are also higher. The heat energy is converted into heat energy to be dissipated in the cooling medium, and the heat energy is connected with a proper braking resistor through the braking unit to realize energy conversion and consumption, so that the risk of pollution to a power grid is avoided, and the heat energy is an economic and reliable choice in general-scale application occasions, so that the heat energy is widely applied.

In recent years, due to the tendency of the offshore floating crane to be reset, the braking resistor of natural air cooling is replaced by the forced air cooling resistor with higher power density and more compact arrangement due to low power density, more installed quantity, total weight and large total occupied area. Typically, a compact stainless steel sheet resistor is used, with higher power densities corresponding to higher heat dissipation requirements. Thus, the overall installation location of this type of brake resistor remains outdoor. However, the cooling mode of the air-cooled resistor of the current type cannot meet the heat dissipation requirement of the marine environment.

Disclosure of utility model

In view of the above, the present utility model provides a brake resistor heat dissipation device, which is used for solving the problems that outdoor air in marine environment is unfavorable for cooling a resistor module, resulting in salt fog pollution and even damage to a brake unit.

In order to solve the technical problems, the utility model provides a brake resistor heat dissipation device, which is used for a crane with a machine room, the machine room top of the crane is provided with an opening, and the brake resistor heat dissipation device comprises:

The metal box body is of a vertical columnar structure, an air outlet and an air inlet are formed in the shell of the metal box body, a cooling air channel which is communicated with the air outlet and the air inlet is formed in the metal box body, and the air inlet is communicated with the opening;

The resistor module is arranged in the cooling air duct and used for converting electric energy into heat energy;

The air cooling motor is arranged at the air inlet and used for conveying air flow in the machine room into the cooling air duct so as to cool the resistor module through the air flow in the machine room.

In one embodiment of the present utility model, it comprises: the fan housing is installed at the air outlet and is used for preventing rainwater from flowing backwards.

In one embodiment of the utility model, the inner side wall of the metal box body is uniformly provided with a space heater for dehumidification.

In one embodiment of the utility model, the air outlet of the metal box is provided with a temperature sensor for monitoring and detecting the temperature in the cooling air duct.

In one embodiment of the utility model, an air pressure switch is arranged at an air outlet of the metal box body and is used for detecting the air quantity and the air pressure of the cooling air channel.

In one embodiment of the utility model, the hood is inverted-L-shaped.

In one embodiment of the utility model, the open hole of the crane roof is provided with an open hole flange, and the air inlet is provided with a box body flange matched with the open hole flange for ensuring the tightness between the metal box body and the crane room.

In one embodiment of the utility model, a filter assembly is mounted at the air inlet of the metal box for filtering air drawn into the cooling air duct from the crane room.

In one embodiment of the utility model, a temperature and humidity sensor is arranged between the filtering component and the air cooling motor and is used for detecting the temperature and humidity of the cooling medium.

In one embodiment of the utility model, the metal case is a stainless steel material piece.

The technical scheme of the utility model has the following beneficial effects:

According to the braking resistor heat dissipation device, the opening is arranged on the top of the machine room and matched with the metal box body, and the braking resistor is cooled by air in the crane machine room. Compared with the traditional brake resistor heat dissipation device which uses outdoor air in a marine environment, the high-humidity high-salt heat dissipation device is easy to cause salt fog pollution so as to influence the insulation performance, and the dryness of a cooling medium is improved, so that the heat dissipation efficiency is greatly improved.

Drawings

FIG. 1 is a schematic diagram of a brake resistor heat dissipation device according to an embodiment of the utility model;

FIG. 2 is a schematic diagram of a brake resistor heat dissipation device according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a roof of a crane according to an embodiment of the utility model;

Fig. 4 is a schematic structural diagram of a brake resistor heat dissipation device according to an embodiment of the utility model.

Reference numerals:

100. A brake resistor heat sink; 10. opening holes; 11. a machine room; 20. a metal box; 21. an air inlet; 22. an air outlet; 221. a fan housing; 23. a cooling air duct; 30. a resistor module; 31. a junction box; 32. a copper bar; 40. an air-cooled motor; 50. a cable; 51. a cable penetration hole; 52. a cable tray.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the utility model, fall within the scope of protection of the utility model.

In order to facilitate understanding of the technical scheme of the present utility model, first, the technical problem to be solved by the present utility model will be described.

Because the air-cooled resistor has higher power density, more compact arrangement and higher power density, the air-cooled resistor can meet higher heat dissipation requirement, and if a high-power fan is adopted to directly blow the resistor to achieve the purpose of heat dissipation, the requirement on cooling medium is higher. Through analysis, outdoor air in a general marine environment is high in humidity and high in salt, is unfavorable for directly cooling the resistor disc, is easy to cause salt fog pollution to influence the insulating property, and is light in failure, influences operation, and is heavy in failure, so that the brake unit is damaged. In order to solve the technical problems, the utility model provides the braking resistor heat dissipation device, which takes relatively dry air in a machine room as a cooling medium, so that not only can the resistor sheet be better cooled, but also the resistor sheet can be better protected.

A brake resistor heat sink 100 according to an embodiment of the present utility model will be described in detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, fig. 1 shows a first schematic structural diagram of a brake resistor heat dissipating apparatus 100 according to an embodiment of the present utility model, and fig. 2 shows a second schematic structural diagram of the brake resistor heat dissipating apparatus 100 according to an embodiment of the present utility model.

To facilitate understanding of the brake resistor heat sink, first, the structure between the brake resistor heat sink 100 and the machine room 11 will be described.

As shown in fig. 1 and 2, a junction box 31 is mounted on the outer peripheral wall of the metal case 20, the resistor box is connected with the junction box 31 through a copper bar 32, and the junction between the copper bar 32 and the metal case 20 is sealed by silicone rubber or a stuffing box. The resistance box is connected with the machine room 11 of the crane through a cable 50, and a cable cabin penetrating hole 51 for routing the cable 50 is formed in the wall of the machine room 11 of the crane. The cable 50 from the brake unit to the resistance module 30 is mounted and arranged on the cable bracket 52 via a cable penetration hole 51 in the wall of the machine room 11, laid to the junction box 31, and connected to the resistance module 30 through the copper bar 32 inside the junction box 31, thereby realizing the connection of the brake unit and the resistance module 30 in the machine room 11. In addition, in other embodiments of the present utility model, the resistor module 30 and the junction box 31 may be connected by the cable 50, and the connection manner between the resistor module 30 and the junction box 31 is not limited in the present utility model.

Referring to fig. 3 in combination with fig. 1, fig. 3 shows a schematic view of the top of a machine room 11 of a crane according to an embodiment of the utility model. As shown in fig. 1, the brake resistor heat sink 100 includes a metal case 20, a resistor module 30, and an air-cooled motor 40. The brake resistor heat dissipation device 100 is used for a crane with a machine room, and an opening 10 is arranged on the top of the machine room 11 of the crane.

As shown in fig. 1 and 3, the metal box 20 has a vertical columnar structure, an air outlet 22 and an air inlet 21 are provided on the outer shell of the metal box 20, and a cooling air duct 23 communicating the air outlet 22 and the air inlet 21 is formed inside the metal box 20, wherein the cooling air duct 23 may be in an inverted L shape, and the air inlet 21 is communicated with the opening 10. The resistance module 30 is installed in the cooling air duct 23, and the resistance module 30 is formed by integrating and assembling brake resistance energy dissipation components, namely stainless steel resistance sheets, and is used for converting electric energy into heat energy. The resistance module 30 is located in a resistance box, the resistance box is installed in the cooling air duct 23, and is externally connected with an air-cooled motor 40 with 380V power supply and a 220V heater, and can be externally connected with machines with different specifications according to different applications. The air-cooled motor 40 is installed at the air inlet 21 and is used for conveying the air flow in the machine room 11 into the cooling air duct 23 so as to cool the resistor module 30 through the air flow in the machine room 11.

In the embodiment of the present utility model, as shown in fig. 1, the metal box 20 is vertically installed on top of the crane room 11 to form a chimney structure. The periphery of the metal box body 20 is sealed, and the protection grade of the IP56 is achieved except the air outlet 22 and the air inlet 21. The resistor module 30 is a modular structure which is formed by a certain number of resistor plates through a certain form of electrical connection and is convenient to assemble and disassemble. The air inlet 21 of the metal box body 20 is communicated with the opening 10 on the top of the crane machine room 11, air in the machine room 11 is used for cooling the resistor module 30, and the air in the machine room 11 is conveyed into the cooling air duct 23 through the air cooling motor 40, so that the resistor module 30 positioned in the cooling air duct 23 dissipates heat. Compared with the heat dissipation device in the prior art, outdoor air in the marine environment is adopted to dissipate heat of the brake resistor, high humidity and high salt are not beneficial to directly cooling the resistor disc, and the problems that salt fog pollution is easily caused to influence insulating performance, light faults affect operation and heavy faults damage the brake unit are solved. According to the embodiment of the utility model, the dry air in the machine room 11 is used as the cooling medium, so that the dryness of the cooling medium is improved, the possibility of failure of the brake resistor is greatly reduced, and the working efficiency is improved.

In one embodiment of the present utility model, referring to fig. 4 in combination with fig. 1, fig. 4 shows a third schematic structural diagram of a brake resistor heat dissipating apparatus 100 according to an embodiment of the present utility model. As shown in fig. 1 and 4, the brake resistor heat sink 100 includes a hood 221, and the hood 221 is installed at the air outlet 22 to prevent rainwater from flowing backward. The fan housing 221 is welded to the air outlet 22 of the metal box 20, so that the fan housing 221 is firmly fixed to the air outlet 22 of the metal box 20.

In one embodiment of the present utility model, the inner side wall of the metal case 20 is uniformly provided with a space heater for dehumidification. The space heater evenly distributed is in the inside wall of metal box 20 and is located in cooling wind channel 23, and when resistance module 30 is inoperative, because marine environment's air water vapor is more, the space heater can detach the comdenstion water on cooling wind channel 23 inner wall and the resistance module 30, keeps the space desiccation.

In one embodiment of the present utility model, the air outlet 22 of the metal case 20 is provided with a temperature sensor for monitoring and detecting the temperature in the cooling air duct 23, which is beneficial to judging the heat dissipation degree of the brake resistor.

In one embodiment of the present utility model, the air outlet 22 of the metal box 20 is provided with an air pressure switch for detecting the air volume and the air pressure of the cooling air duct 23, so as to ensure that the cooling air duct 23 can ventilate normally.

In one embodiment of the present utility model, the hood 221 is inverted L-shaped to further facilitate preventing rain water from flowing backward.

In one embodiment of the utility model, the opening 10 on the top of the crane room 11 is provided with an opening 10 flange, and the air inlet 21 is provided with a box flange matched with the opening 10 flange for ensuring the tightness between the metal box 20 and the crane room 11.

In one embodiment of the present utility model, the air inlet 21 of the metal box 20 is provided with a filter assembly, which can be replaced from the machine room 11, and the filter assembly can be filter cotton for filtering air sucked into the cooling air duct 23 from the crane machine room 11, so as to facilitate improving the cleanliness of the air in the cooling air duct 23. In addition, in other embodiments of the present utility model, the filter assembly may be activated carbon or biochemical cotton, and the present utility model is not limited to the type of filter assembly.

In one embodiment of the present utility model, a temperature and humidity sensor is provided between the filter assembly and the air-cooled motor 40 for detecting the temperature and humidity of the cooling medium. When the temperature and the humidity of the cooling medium meet the requirements of cooling the brake resistor, the brake resistor heat dissipation device 100 is started to cool the resistor module 30, so that the cooling quality of the brake resistor heat dissipation device 100 is ensured.

In one embodiment of the utility model, the metal case 20 is a stainless steel material piece for corrosion protection.

The following describes the operation of the brake resistor heat dissipating apparatus 100 according to the embodiment of the present utility model with reference to fig. 1 to 4.

The air inlet 21 of the metal box body 20 is communicated with the opening 10 on the top of the crane machine room 11, when the resistor module 30 is subjected to heat dissipation, the air-cooled motor 40 is started, air in the machine room 11 is conveyed into the cooling air duct 23 through the air-cooled motor 40, and the resistor module 30 is directly blown to cool down, so that the resistor module 30 is subjected to heat dissipation.

In summary, according to the brake resistor heat dissipation device 100 of the present utility model, the opening 10 is arranged on the top of the machine room 11 and is matched with the metal box 20, and the brake resistor is cooled by the air in the crane machine room 11, so that the dryness of the cooling medium is improved, and the heat dissipation efficiency is greatly improved. The fan housing 221 at the air outlet 22 of the metal box 20 can prevent rainwater from flowing backward, and is matched with the space heater to ensure the dryness of the cooling air duct 23, thereby being beneficial to improving the insulation index of the resistor module 30 and being beneficial to heat dissipation of the resistor module 30.

Other structures and operations of the brake resistor heat dissipating apparatus 100 according to embodiments of the present utility model will be understood and readily implemented by those skilled in the art, and thus will not be described in detail.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.

While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.

Claims

1. The utility model provides a brake resistance heat abstractor, its characterized in that is used for the hoist of taking the computer lab, the computer lab top of hoist is equipped with the trompil, brake resistance heat abstractor includes:

The resistor module is arranged in the cooling air duct and is used for converting electric energy into heat energy;

2. The brake resistor heat sink according to claim 1, comprising: the fan housing is arranged at the air outlet and used for preventing rainwater from flowing backwards.

3. The brake resistor heat sink of claim 1 wherein space heaters are uniformly provided on the inner side walls of the metal case for dehumidification.

4. The brake resistor heat sink of claim 1, wherein the air outlet of the metal case is provided with a temperature sensor for monitoring and detecting the temperature in the cooling air duct.

5. The brake resistor heat sink according to claim 1, wherein the air outlet of the metal case is provided with an air pressure switch for detecting an air volume and an air pressure of the cooling air duct.

6. The brake resistor heat sink of claim 2, wherein the housing is inverted L-shaped.

7. The brake resistor heat sink of claim 1 wherein the opening in the crane roof is provided with an opening flange, and the air inlet is provided with a box flange matching the opening flange for ensuring tightness between the metal box and the crane room.

8. The brake resistor heat sink of claim 1, wherein a filter assembly is mounted at the air inlet of the metal case for filtering air drawn into the cooling duct from the crane room.

9. The brake resistor heat sink of claim 8 wherein a temperature and humidity sensor is disposed between the filter assembly and the air cooled motor for detecting the temperature and humidity of the cooling medium.

10. The brake resistor heat sink of claim 1 wherein the metal housing is a stainless steel material.