Self-ventilation air pipe for rotating device and self-ventilation heat dissipation structure in winding drum

Abstract

The utility model relates to a self-ventilation air pipe for a rotating device and a self-ventilation heat dissipation structure in a winding drum. The extending direction of the self-ventilation air pipe is parallel to the rotating axis of the rotating device. A plurality of air pipes extending in the axial direction are arranged on one side in a winding drum of the self-ventilation heat dissipation structure in the winding drum, the air pipes are conical and evenly distributed on the same circumference with the axis of the winding drum as the axis, the two ends of each air pipe are fixedly installed and located on corresponding pore plates in the winding drum respectively, and the large ends of the air pipes face a heat source area in the winding drum and are communicated with the heat source area. The winding drum is rotationally installed on the supports at the two ends. When the winding drum rotates, airflow flowing from the large end to the small end is formed in the air pipe by means of the conical characteristic of the air pipe, the airflow in the movable winding drum passes through the periphery of heat production equipment in a heat source area, heat energy is taken away, and therefore the temperature in the winding drum and the temperature of the heat production equipment are reduced. The device is simple in structure, reliable in operation, small in size, light in weight, basically free of cost increase and beneficial to popularization and application.

Description

Technical Field

[0001] The utility model relates to a self-ventilation heat dissipation structure in a reel and a self-ventilation air duct used for a rotating device, belonging to the technical field of machinery. Background Art

[0002] There are two main ways of ventilation cooling in existing closed (basically closed) spaces. One is to open a number of heat dissipation holes on the shell and use the natural upward trend of hot air in the shell to generate airflow. However, the heat dissipation effect of this method is very limited and cannot effectively dissipate heat / cool the motor built into the reel; the other is forced ventilation with power equipment such as fans. The fans can be set inside or outside the shell, and rely on the power of the fans to form airflow in the shell to ensure the air cooling effect. For example, Chinese patent document CN211480673U discloses a low-voltage switch cabinet with forced ventilation and heat dissipation, including a switch cabinet body, a first heat dissipation box body and a second heat dissipation box body are respectively provided at the upper parts of both ends of the switch cabinet body, the top and side of the first heat dissipation box body are provided with cold air inlets with dust covers, a first heat dissipation fan is provided in the first heat dissipation box body, a first vent is provided on the inner side surface of the first heat dissipation box body facing the opening on the left side of the switch cabinet body, the air outlet of the first heat dissipation fan is connected to the first vent, a hot air outlet is provided on the top and side of the second heat dissipation box body, a second heat dissipation fan is provided in the second heat dissipation box body, a second vent is provided on the inner side surface of the second heat dissipation box body facing the opening on the right side of the switch cabinet body, the air inlet of the second heat dissipation fan is connected to the second vent, and the first heat dissipation box body, the internal channel of the switch cabinet body and the second heat dissipation box body are connected to form a convection heat dissipation channel. Chinese patent document CN112467250A discloses a heat dissipation duct for energy storage batteries utilizing high-pressure gas injection, comprising a forced ventilation module, a high-pressure gas injection module and a flow field control device module. The forced ventilation module comprises a ventilation duct, a static pressure box, an air inlet and an air outlet. A high-pressure gas injection module is installed in each ventilation duct. Chinese patent document CN104158315A discloses a motor with internal cooling of the stator, wherein fixed disks are provided at both ends of the outer rotor, gaps constituting end pressure-equalizing air gaps are left between the two ends of the stator and the fixed disks at the corresponding ends, an annular gap constituting an external heat dissipation duct is provided between the outer side surface of the stator and the inner side surface of the rotor, an axial through hole constituting an internal heat dissipation duct is provided in the stator core, both ends of the external heat dissipation duct and both ends of the internal heat dissipation duct are respectively connected to the end pressure-equalizing air gaps of the corresponding ends, and the two end pressure-equalizing air gaps are respectively connected to their respective ventilation ducts, the ventilation duct of one end pressure-equalizing air gap is used as an air inlet duct, and the ventilation duct of the other end pressure-equalizing air gap is used as an air outlet duct, and a forced ventilation device is provided on the ventilation duct of at least one end pressure-equalizing air gap. This type of technology requires the provision of a fan and supporting structure used as a forced ventilation power, which is not conducive to the simplification of the equipment structure and also increases the corresponding manufacturing cost and maintenance cost.

[0003] At present, the drum drive motor of the crane hoisting mechanism is usually arranged outside the drum, and the drive connection between the two is realized through a coupling or a reduction transmission mechanism. However, there is also a way to arrange the drive motor inside the drum. Since the motor does not occupy space alone, it is conducive to the compactness of the overall structure of the equipment, and it is also conducive to the protection of the motor through the drum, so it has obvious advantages in relevant occasions. For example, Chinese patent document CN115492899A discloses a permanent magnet reduction motor, in which the fixed gear ring of the reduction mechanism is fixedly installed on the rear end cover of the casing with bolts, and the double gear is rotatably installed on the rotor through the shaft and the bearing, and the double gear is evenly distributed in three directions. The reduction motor can be arranged in the drum of the crane hoisting mechanism, the output shaft of the motor is connected to the support bearing assembly in the drum, and the rotating gear ring is fixedly installed on the inner wall of the drum. The two ends of the double gear are respectively engaged with the fixed gear ring and the rotating gear ring to realize the driving of the drum. Chinese patent document CN104158375A discloses a crane using an ultra-low speed high torque motor, with the drum of the lifting mechanism as the housing of the motor rotor, so that all other structures of the motor are located inside the drum. This technical concept effectively solves the problem that the motor, the drum and the connecting devices of the two occupy space separately, which can significantly save the space occupied by the equipment, and the drum plays an effective role in protecting the motor. However, it also brings a new technical problem, that is, because the motor is located inside the drum, there is basically no ventilation and cooling conditions, which is easy to produce high temperature rise and have an adverse effect on the motor, and even cannot work normally.

[0004] The study found that when the conical tube rotates with the rotating device, an airflow will be formed inside the tube, flowing in from the large end and out from the small end. This discovery makes it possible for rotating devices such as reels to achieve internal self-ventilation cooling during operation. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a self-ventilating air duct for a rotating device, and also provides a self-ventilating heat dissipation structure inside a reel using such a self-ventilating air duct, so as to automatically realize internal ventilation during the operation of the reel or other rotating devices without the need for a special fan.

[0006] The technical solution of the utility model is that the self-ventilation air duct for the rotating device is conical, open at both ends, and its extension direction (axial direction) is parallel to the rotating axis of the rotating device.

[0007] The self-ventilation and heat dissipation structure inside the drum is characterized in that a plurality of axially extending air ducts are provided on one side (either side in the axial direction) inside the drum, the air ducts are conical (cone-shaped) with open ends, and can be / are called conical tubes (conical tubes), and the two ends of the air ducts are respectively fixedly mounted on corresponding orifice plates (orifice plates at corresponding positions) inside the drum.

[0008] Preferably, the port of the air duct is aligned with the corresponding through hole on the corresponding orifice plate (axis aligned) so as to communicate with the space on the other side of the orifice plate through the corresponding through hole on the orifice plate.

[0009] The end of the air duct can be fixedly connected to the orifice plate in any suitable manner. For example, the end of the air duct is fixedly welded to the orifice plate, and the pipe hole at the end is consistent in size with the corresponding through hole on the orifice plate.

[0010] The cross section of the air duct may be any suitable shape. Preferably, the cross section of the air duct is circular, or in other words, the air duct is preferably a conical tube (a conical tube with a circular cross section).

[0011] Each air duct can be the same (same shape and size, etc.), or in other words, each air duct can use the same type of air duct to facilitate the uniformity and stability of the air flow in the reel. Depending on actual needs, they can also be different.

[0012] The other side of the drum (the side without the air duct) can be regarded as a heat source area for setting up heat-generating equipment (for example, the drum drive motor should be set inside the drum).

[0013] Preferably, the big end of the air duct (the end with a larger port area) faces the heat source area in the drum and is connected to the heat source area. When the drum rotates, the air in the heat source area is sucked into the air duct from the big end, and the air sucked into the air duct flows through the air duct and is discharged from the small end of the air duct.

[0014] Either end of the drum may or may not be provided with a drum end plate. The drum end plate (if provided) should usually be provided with a ventilation channel (e.g., a vent) to facilitate the discharge of external air or the discharge of air from the drum / air duct. Three combinations can be formed: drum end plates are provided at both ends, drum end plates are not provided at both ends, and drum end plates are provided at one end and not provided at the other end.

[0015] According to actual needs, the ventilation ducts (for example, ventilation holes) of the heat source area / air duct heat source side can also be set in other parts of the heat source area, for example, on the drum wall at a higher temperature part in the adjacent heat source (heat generating equipment).

[0016] The reel can be rotatably mounted on supports (or support seats, or supports) at both ends so as to rotate under the drive of a rotary drive device.

[0017] The structure on the reel used for rotational connection with the support can be a connecting shaft (or shaft-shaped structure) or a connecting sleeve (or sleeve, sleeve-shaped structure, or sleeve-shaped structure), which is installed on the corresponding support through a bearing, and the corresponding support is provided with a bearing seat matching the connecting shaft on the reel or a fixed shaft matching the connecting sleeve on the reel. When a combination of a connecting shaft and a bearing seat is used, the outer ring of the bearing is fixedly installed on the bearing seat, and the connecting shaft is fixedly inserted on the inner ring of the bearing; when a combination of a connecting sleeve and a fixed shaft is used, the inner ring of the bearing is fixedly sleeved on the fixed shaft, and the outer ring of the bearing is fixedly embedded in the connecting sleeve, and a bearing seat / bearing seat structure for embedding the outer ring of the bearing is provided in the hole of the connecting sleeve.

[0018] Preferably, the air ducts are evenly distributed on the same circumference (the same cylindrical surface) with the axis of the reel as the axis (center).

[0019] The taper or cone angle of the air duct may be set according to actual needs. For example, the cone angle of the air duct may be 3°-9°, and the specific value may be selected / verified through experiments.

[0020] The beneficial effect of the utility model is that since a number of axially extending conical air ducts are arranged in the drum, during the rotation of the drum, an airflow flowing from the large end to the small end is automatically formed in the air duct, and the large end of the air duct is directed toward the area where the heat generating equipment is located in the drum. According to the ventilation needs, a vent is arranged on the end face of the drum, thereby automatically achieving the required ventilation and heat dissipation in the drum during the working process (drum rotation process), without the need to separately arrange a fan and accessories for forced ventilation, avoiding the complex structure caused by the installation of a fan, etc., saving manufacturing costs and maintenance costs, and not requiring the use of space outside the drum. According to the experimental / test data under field use, this self-ventilating structure is applied to the drum mechanism (motor built into the drum) of several bridge cranes with different rated lifting weights, which can achieve a satisfactory motor cooling effect and keep the motor temperature rise within the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the self-ventilation heat dissipation structure involved in the utility model;

[0022] Figure 2 It is a schematic diagram of the air duct involved in the utility model;

[0023] Figure 3 It is a schematic diagram of an application example of the self-ventilation heat dissipation structure involved in the utility model in a crane drum mechanism;

[0024] Figure 4 It is a schematic diagram of another application example of the self-ventilation heat dissipation structure involved in the utility model in the crane drum mechanism.

[0025] Markings in the figure: 1. reel; 2. air duct; 3. end plate; 4. orifice plate; 5. support; 6. ventilation duct; 7. inner rotor reduction motor; 8. outer rotor direct drive motor; 9. connecting part; 10. heat source area. DETAILED DESCRIPTION

[0026] See also Figure 1-Figure 4 The utility model adopts a conical tube as a self-ventilating air duct, and this air duct can be used for any suitable rotating device to achieve self-ventilating cooling / cooling of the rotating device.

[0027] Applying this type of air duct to the reel is an effective way to achieve cooling / lowering the temperature inside the reel. An air duct 2 for self-ventilation is arranged inside the reel 1 or other similar rotating shell. The number of air ducts is several, for example, 6, evenly distributed on a cylindrical surface coaxial with the reel. The two ends of the air duct are fixed with a perforated plate 4. Ventilation channels (ventilation holes) 6 are opened on the end plates 3 at both ends of the reel to allow air to flow in and out. The size, shape and direction of the large and small heads of each air duct are the same. The two ends of the reel are rotatably supported on the supports 5 on both sides. When the reel rotates under the drive of the motor (regardless of the rotation direction), the air duct can play a role in making the air in the reel flow in an orderly manner. When the reel rotates, the negative pressure generated by the external air duct continuously flows from the left end ( Figure 1 The airflow is injected into the drum (in the left end direction shown in the figure). When the airflow passes around the heat generating equipment, it takes away the heat energy and is discharged from the right end of the drum through the air duct. By continuously taking away the heat in the drum, a cooling effect is achieved. The space inside the drum can be divided into two sections in the axial direction. One side (one section) is provided with an air duct (and orifice plate, etc.), and the other side is a heat source area (space) 10 for installing the heating equipment that needs to be installed in the drum.

[0028] Since the drum can be self-ventilated, when used in the hoisting mechanism of a crane, the drum can be equipped with a built-in motor. The motor can be arranged in the drum and self-ventilated and cooled through the air duct to reduce the temperature around the motor and thus reduce the temperature rise of the motor. The motor used can be an inner rotor reduction motor 7 (see Figure 1 ), or it can be an external rotor direct drive motor 8 (see Figure 3 ), when an outer rotor direct-drive motor is used, taking into account the ventilation around the motor, the outer diameter of the motor housing can be appropriately smaller than the inner diameter of the drum, and the motor (outer rotor housing) is fixedly connected to the inner wall of the drum through circumferentially and axially distributed connecting parts 9, and air can pass through the gaps between the connecting parts.

[0029] See also Figure 2, the duct exhaust principle can be simply understood as: the cross-section of the B end (small end) of the duct is smaller than that of the A end (large end). According to the relevant formula V=Q / S (where V represents the air flow rate, Q represents the flow rate, and S represents the cross-sectional area through which the air flows), when the air flows through the duct, the air flow rate V is continuously accelerating from the A end to the B end, that is, VA>VB. Since the dynamic pressure Pd of the air is directly proportional to the flow rate of the air, that is, the dynamic pressure at the B end is greater than the dynamic pressure at the A end, PdB>PdA, and the total pressure of the air Ptotal is equal to the dynamic pressure plus the static pressure Pj, that is, Ptotal=Pd+Pj. Therefore, the static pressure at the B end is less than the static pressure at the A end (PjA>PjB). The air has a tendency to flow from A to B. The air disturbance occurs when the drum rotates, and effective wind can be formed in the duct after a short time.

[0030] The reel referred to in the present utility model is a rotating part (including components, devices, etc.) of any cylindrical or similar shape, which can also be called a rotating drum or a roller, including but not limited to a crane reel.

[0031] The utility model has the advantages of simple structure, reliable operation, small size, light weight, basically no increase in cost, and is conducive to popularization and application.

[0032] Unless otherwise specified or when one preferred or optional technical means is a further limitation of another technical means, the preferred and optional technical means disclosed in the present utility model can be arbitrarily combined to form several different specific implementation methods.

Claims

1. A self-ventilating air duct for a rotating device, characterized in that It is conical in shape, open at both ends, and its extension direction is parallel to the rotation axis of the rotating device.

2. The self-ventilation and heat dissipation structure inside the reel is characterized by A plurality of axially extending air ducts are arranged on one side of the reel. The two ends of the air ducts are open and tapered. The two ends of the air ducts are respectively fixedly mounted on corresponding orifice plates in the drum.

3. The self-ventilation heat dissipation structure in the reel as claimed in claim 2, characterized in that The air duct is a conical tube.

4. The self-ventilation heat dissipation structure in the reel as claimed in claim 2 or 3, characterized in that The ports of the air ducts are aligned with the corresponding through holes in the corresponding orifice plates.

5. The self-ventilation heat dissipation structure in the reel as claimed in claim 2 or 3, characterized in that The port of the air duct is fixedly welded on the orifice plate, and the pipe hole at the port is consistent in size with the corresponding through hole on the orifice plate.

6. The self-ventilation heat dissipation structure in the reel as claimed in claim 2 or 3, characterized in that The air ducts are the same.

7. The self-ventilation heat dissipation structure in the reel as claimed in claim 2 or 3, characterized in that The large end of the air duct faces the heat source area in the drum and is connected with the heat source area.

8. The self-ventilation heat dissipation structure in the reel as claimed in claim 2 or 3, characterized in that Either end of the reel is provided with or without a reel end plate, and a ventilation channel is provided on the reel end plate.

9. The self-ventilation heat dissipation structure in the reel as claimed in claim 2 or 3, characterized in that The reel is rotatably mounted on supports at both ends.

10. The self-ventilation heat dissipation structure in the reel as claimed in claim 2 or 3, characterized in that The air ducts are evenly distributed on the same circumference with the axis of the reel as the axis.

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