Frequency conversion cabinet cooling device

Abstract

The utility model discloses a frequency conversion cabinet cooling device which comprises an installation frame connected with an existing air pipe through bolts, the upper surface of the installation frame is in threaded connection with an exhaust pipe, and a gearbox is fixedly installed on the left side surface of the installation frame. According to the working state and the load condition of the frequency conversion cabinet, the controller adjusts the distance between the left variable-speed conical belt disc and the right variable-speed conical belt disc according to the size relation between detection data A and A, and therefore the rotating speed of the fan blades driven by the variable-speed output shaft is adjusted, and the rotating speed of the fan blades driven by the variable-speed output shaft is adjusted. The operation efficiency of the frequency conversion cabinet and the energy efficiency of the fan are effectively improved, the stability and reliability of the system are ensured, the problem of temperature rise caused by heat accumulation during high-load operation of an existing frequency conversion cabinet is solved, and the problems of noise and vibration caused by the mode of accelerating heat dissipation by increasing the rotating speed of the fan are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency conversion cabinet cooling, in particular to a frequency conversion cabinet cooling device. Background Art

[0002] The inverter is a high-power power electronic device that needs to be equipped with a large number of power semiconductor devices. A large amount of heat will be generated during operation. The heat accumulation will shorten the life of electronic components. The life will be shortened by about half for every 10°C increase in operating temperature. Power semiconductor devices are temperature-sensitive devices. Burning out power semiconductor devices due to excessively high junction temperature is one of the common causes of inverter failure.

[0003] For example, a frequency conversion cabinet cooling device disclosed in a Chinese patent document (Announcement No.: CN219961181U) "comprises a frequency conversion cabinet, a plurality of feet are fixedly connected to the lower surface of the frequency conversion cabinet, a cabinet door is rotatably connected to one side of the frequency conversion cabinet, a door handle is fixedly connected to the cabinet door, a vent is opened at the bottom of the cabinet door, an air duct is fixedly connected to the upper end of the frequency conversion cabinet, a bellows is fixedly connected to the end of the air duct close to the frequency conversion cabinet, and the plurality of feet are made of rubber."

[0004] Although the above-mentioned existing frequency converter cabinet cooling device has achieved the effect of "opening holes on the top of the frequency converter cabinet and installing fans and air ducts to reduce the hot air circulation on the top of the cabinet, which is beneficial to the heat dissipation of the frequency converter cabinet", when the frequency converter cabinet is running at high load, as the heat inside the frequency converter cabinet accumulates, the temperature will continue to rise. If you want to speed up the heat dissipation speed, you can only increase the heat dissipation speed of the frequency converter cabinet by controlling the speed of the fan. If you increase the speed of the fan, there are the following problems:

[0005] Increased noise: The increase in fan speed will lead to an increase in noise level, which will have an adverse impact on the operating environment of the inverter cabinet and the comfort of the staff, especially when they need to be exposed to a high noise environment for a long time;

[0006] Vibration problem: Increasing the fan speed will increase the fan's vibration frequency, which in turn will impact the electronic equipment and components in the frequency converter cabinet, affecting their normal operation and reliability. Utility Model Content

[0007] The purpose of the utility model is to provide a frequency conversion cabinet cooling device to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a frequency conversion cabinet cooling device, comprising an installation frame connected to an existing air duct by bolts, the upper surface of the installation frame being threadedly connected to an exhaust duct, a gearbox being fixedly installed on the left surface of the installation frame, a speed change mechanism being arranged inside the gearbox, and the speed change mechanism comprising a bidirectional screw rod, both ends of the bidirectional screw rod being rotatably sleeved with the inner wall of the gearbox, the two bidirectional screw rods being symmetrically distributed with the axis of the gearbox as the center of symmetry, and a controller for controlling the speed change mechanism being fixedly installed on the front side of the gearbox.

[0009] Preferably, the speed change mechanism also includes a pitch variable motor, which converts electrical energy into mechanical energy to provide a power source for the speed change mechanism. The pitch variable motor is fixedly mounted on the right inner wall of the gearbox, and the output shaft of the pitch variable motor is fixedly connected to one end of one of the bidirectional screw rods through a coupling. The surface of the bidirectional screw rod is bounded by the center and has a left displacement block and a right displacement block threadedly sleeved on both ends.

[0010] Preferably, the right side surface of the left displacement block is rotatably sleeved with a left speed-changing conical belt reel, and the left side surface of the right displacement block is rotatably sleeved with a right speed-changing conical belt reel, and the outer surface of the right speed-changing conical belt reel is plugged into the inner wall of the left speed-changing conical belt reel, and through the plugging between the right speed-changing conical belt reel and the left speed-changing conical belt reel, the left speed-changing conical belt reel can move left and right along the surface of the right speed-changing conical belt reel while the right speed-changing conical belt reel and the left speed-changing conical belt reel are rotated.

[0011] Preferably, a drive motor is fixedly mounted on the right side surface of one of the right displacement blocks, and the output shaft of the drive motor is fixedly connected to the right side surface of one of the right speed-changing conical belt pulleys through a coupling, and a speed-changing output shaft is rotatably sleeved on the right side surface of the other right displacement block. When the frequency converter cabinet operates normally, the drive motor is controlled by the controller to drive, and the drive motor drives one of the left speed-changing conical belt pulleys and the right speed-changing conical belt pulley to realize circular rotation with the axis of the output shaft of the drive motor as the center.

[0012] Preferably, one end of the speed change output shaft is fixedly connected to the right side surface of the other right speed change conical belt disk, and the other end of the speed change output shaft is rotatably sleeved with the right side surface of the gearbox and extends to the interior of the mounting frame. The other end of the speed change output shaft located on the right side of the mounting frame is fixedly sleeved with fan blades. When the driving motor drives the speed change output shaft to rotate, it drives the fan blades to rotate in a circle with the axis of the speed change output shaft as the center of the circle in the existing air duct, thereby sucking hot air out of the frequency conversion cabinet and discharging it through the exhaust duct.

[0013] Preferably, a steel belt for transmission connection is arranged between the left speed-changing conical belt pulley and the right speed-changing conical belt pulley, a sensing plate is fixedly mounted on the upper surface of the left displacement block, and a laser ranging sensor is fixedly mounted on the upper surface of the right displacement block. Through the sensing plate and the laser ranging sensor arranged above the left displacement block and the right displacement block, the distances between the two groups of left speed-changing conical belt pulleys and the right speed-changing conical belt pulleys are respectively detected in real time, and the outer surfaces of the left displacement block and the right displacement block are both slidably connected to the inner wall of the gearbox.

[0014] Preferably, the right side surface of the sensing sheet and the right side surface of the left displacement block are on the same horizontal plane, the left side surface of the laser ranging sensor and the left side surface of the right displacement block are on the same horizontal plane, and the adjacent bidirectional screw rods are connected by external meshing of gears, and the external meshing of gears drives the other bidirectional screw rod to rotate in the opposite direction, driving the left displacement block and the right displacement block on the surface of the other bidirectional screw rod to perform expansion movement.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows: the frequency converter cabinet cooling device, by setting a speed change mechanism, can achieve an online stepless speed change effect on the fan blade rotation speed. According to the working state and load condition of the frequency converter cabinet, the controller adjusts the distance between the left speed change conical belt pulley and the right speed change conical belt pulley according to the size relationship of the detection data A and A, thereby adjusting the speed of the fan blade driven by the speed change output shaft, effectively improving the operating efficiency of the frequency converter cabinet and the energy efficiency of the fan, while ensuring the stability and reliability of the system, solving the problem of temperature rise caused by heat accumulation when the existing frequency converter cabinet is running at high load, and avoiding the noise and vibration problems caused by accelerating the heat dissipation by increasing the fan speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a cross-sectional view of the gearbox structure of a frequency conversion cabinet cooling device proposed by the utility model;

[0018] Figure 3 A three-dimensional diagram of the variable pitch motor structure of a frequency conversion cabinet cooling device proposed by the utility model;

[0019] Figure 4 A three-dimensional diagram of the left displacement block structure of a frequency conversion cabinet cooling device proposed by the utility model;

[0020] Figure 5 This is a three-dimensional diagram of the steel belt structure of a frequency conversion cabinet cooling device proposed by the utility model.

[0021] In the figure: 1. mounting frame; 2. exhaust duct; 3. gearbox; 4. bidirectional lead screw; 41. variable pitch motor; 42. left displacement block; 43. right displacement block; 44. left speed-changing conical belt pulley; 45. right speed-changing conical belt pulley; 46. drive motor; 47. speed-changing output shaft; 48. fan blades; 49. steel belt; 410. induction sheet; 411. laser ranging sensor; 412. gear; 5. controller. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-Figure 5 The utility model provides a technical solution: a frequency conversion cabinet cooling device, comprising an installation frame 1 connected to an existing air duct by bolts, an exhaust duct 2 being threadedly connected to the upper surface of the installation frame 1, a gearbox 3 being fixedly installed on the left surface of the installation frame 1, a speed change mechanism being arranged inside the gearbox 3, and the speed change mechanism comprising a bidirectional screw rod 4, both ends of the bidirectional screw rod 4 being rotatably sleeved with the inner wall of the gearbox 3, the two bidirectional screw rods 4 being symmetrically distributed with the axis of the gearbox 3 as the symmetry center, and a controller 5 for controlling the speed change mechanism being fixedly installed on the front of the gearbox 3.

[0024] Furthermore, the speed change mechanism also includes a variable pitch motor 41, which converts electrical energy into mechanical energy to provide a power source for the speed change mechanism. The variable pitch motor 41 is fixedly installed on the right inner wall of the gearbox 3, and the output shaft of the variable pitch motor 41 is fixedly connected to one end of one of the bidirectional screw rods 4 through a coupling. The surface of the bidirectional screw rod 4 is bounded by the center and the two ends are respectively threaded with a left displacement block 42 and a right displacement block 43.

[0025] Furthermore, a left speed-changing conical belt pulley 44 is rotatably sleeved on the right side surface of the left displacement block 42, and a right speed-changing conical belt pulley 45 is rotatably sleeved on the left side surface of the right displacement block 43. The outer surface of the right speed-changing conical belt pulley 45 is plugged into the inner wall of the left speed-changing conical belt pulley 44. By plugging the right speed-changing conical belt pulley 45 and the left speed-changing conical belt pulley 44, the left speed-changing conical belt pulley 44 can move left and right along the surface of the right speed-changing conical belt pulley 45 while the right speed-changing conical belt pulley 45 and the left speed-changing conical belt pulley 44 are rotated.

[0026] Furthermore, a drive motor 46 is fixedly installed on the right side surface of one of the right displacement blocks 43, and the output shaft of the drive motor 46 is fixedly connected to the right side surface of one of the right speed-changing conical belt reels 45 through a coupling. The right side surface of the other right displacement block 43 is rotatably sleeved with a speed-changing output shaft 47. When the frequency converter cabinet operates normally, the drive motor 46 is controlled by the controller 5, and the drive motor 46 drives one of the left speed-changing conical belt reels 44 and the right speed-changing conical belt reel 45 to realize circular rotation with the axis of the output shaft of the drive motor 46 as the center.

[0027] Furthermore, one end of the speed change output shaft 47 is fixedly connected to the right side surface of the other right speed change conical belt disk 45, and the other end of the speed change output shaft 47 is rotatably sleeved with the right side surface of the gearbox 3 and extends to the interior of the mounting frame 1. The other end of the speed change output shaft 47 located on the right side of the mounting frame 1 is fixedly sleeved with a fan blade 48. When the driving motor 46 drives the speed change output shaft 47 to rotate, it drives the fan blade 48 to rotate in a circle with the axis of the speed change output shaft 47 as the center in the existing air duct, thereby sucking hot air out of the frequency conversion cabinet and discharging it through the exhaust duct 2.

[0028] Furthermore, a steel belt 49 for transmission connection is arranged between the left speed-shift conical belt pulley 44 and the right speed-shift conical belt pulley 45, a sensing plate 410 is fixedly installed on the upper surface of the left displacement block 42, and a laser ranging sensor 411 is fixedly installed on the upper surface of the right displacement block 43. Through the sensing plate 410 and the laser ranging sensor 411 arranged above the left displacement block 42 and the right displacement block 43, the distances between the two groups of left speed-shift conical belt pulleys 44 and the right speed-shift conical belt pulleys 45 are respectively detected in real time, and the outer surfaces of the left displacement block 42 and the right displacement block 43 are slidably connected to the inner wall of the gearbox 3.

[0029] Furthermore, the right side surface of the sensing sheet 410 is on the same horizontal plane as the right side surface of the left displacement block 42, the left side surface of the laser ranging sensor 411 is on the same horizontal plane as the left side surface of the right displacement block 43, and the adjacent bidirectional screw rods 4 are connected by transmission through the external meshing of gears 412 and gears 412. Through the external meshing of gears 412 and gears 412, the other bidirectional screw rod 4 is driven to rotate in the opposite direction, driving the left displacement block 42 and the right displacement block 43 on the surface of the other bidirectional screw rod 4 to perform expansion movement.

[0030] By setting up a speed change mechanism, an online stepless speed change effect of the rotational speed of the fan blades 48 can be achieved. According to the working state and load conditions of the frequency converter cabinet, the controller 5 adjusts the distance between the left speed change conical belt pulley 44 and the right speed change conical belt pulley 45 according to the size relationship of the detection data A1 and A2, thereby adjusting the rotational speed of the fan blades 48 driven by the speed change output shaft 47, effectively improving the operating efficiency of the frequency converter cabinet and the energy efficiency of the fan, while ensuring the stability and reliability of the system, solving the problem of temperature rise caused by heat accumulation when the existing frequency converter cabinet is running at high load, and avoiding the noise and vibration problems caused by accelerating the heat dissipation by increasing the fan speed.

[0031] Working principle: Step 1, when the frequency converter cabinet is operating normally, the controller 5 controls the driving motor 46 to drive, and the driving motor 46 drives one of the left speed-changing conical belt reel 44 and the right speed-changing conical belt reel 45 to rotate in a circle with the axis of the output shaft of the driving motor 46 as the center. At the same time, the steel belt 49 drives the other left speed-changing conical belt reel 44 and the right speed-changing conical belt reel 45 to achieve synchronous rotation, drives the speed-changing output shaft 47 connected to the other right speed-changing conical belt reel 45 to rotate, drives the fan blades 48 to rotate in a circle with the axis of the speed-changing output shaft 47 as the center in the existing air duct, and sucks the hot air out of the frequency converter cabinet and discharges it through the exhaust duct 2;

[0032] Step 2: When the frequency converter cabinet is running at high load, the controller 5 controls the variable pitch motor 41 to start, and the variable speed motor drives one of the bidirectional screws 4 to rotate in a circle with the output shaft axis of the variable pitch motor 41 as the center, driving the left displacement block 42 and the right displacement block 43 on the surface of the bidirectional screw 4 to make a closing movement, and the distance between the left variable speed conical belt disk 44 and the right variable speed conical belt disk 45 is detected in real time by the induction sheet 410 and the laser distance sensor 411 arranged above the left displacement block 42 and the right displacement block 43, and the detection data A1 is fed back to the controller 5;

[0033] Step 3: Through the external meshing of the gear 412 and the gear 412, the other bidirectional screw 4 is driven to rotate in the opposite direction, and the left displacement block 42 and the right displacement block 43 on the surface of the other bidirectional screw 4 are driven to expand. Through the induction sheet 410 and the laser ranging sensor 411 arranged above the left displacement block 42 and the right displacement block 43, the distance between the left speed-changing conical belt disk 44 and the right speed-changing conical belt disk 45 is detected in real time, and the detection data A2 is fed back to the controller 5;

[0034] Step 4: After the controller 5 receives two sets of detection data, the controller 5 compares the distance value of the detection data A1 with the distance value of the detection data A2, which is divided into the following situations:

[0035] S1 and A1 are less than A2. At this time, the variable speed output shaft 47 drives the fan blades 48 to be in a high speed state;

[0036] S2, A1 is equal to A2, at this time, the variable speed output shaft 47 drives the fan blades 48 to be in a normal speed state;

[0037] S3, A1 is greater than A2, at this time, the speed change output shaft 47 drives the fan blades 48 to be in a low speed state;

[0038] Step five, by controlling the distance between the left speed-changing conical belt pulley 44 and the right speed-changing conical belt pulley 45, the rotation speed of the fan blade 48 can be changed online steplessly.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A frequency conversion cabinet cooling device, comprising a mounting frame (1) connected to an existing air duct by bolts, characterized in that: The upper surface of the installation frame (1) is threadedly connected to an exhaust pipe (2), and a gearbox (3) is fixedly mounted on the left surface of the installation frame (1). A speed change mechanism is arranged inside the gearbox (3), and the speed change mechanism comprises a bidirectional screw rod (4), both ends of the bidirectional screw rod (4) are rotatably sleeved with the inner wall of the gearbox (3), and the two bidirectional screw rods (4) are symmetrically distributed with the axis of the gearbox (3) as the symmetry center, and a controller (5) for controlling the speed change mechanism is fixedly mounted on the front of the gearbox (3).

2. A frequency conversion cabinet cooling device according to claim 1, characterized in that: The speed change mechanism further comprises a variable pitch motor (41), the variable pitch motor (41) being fixedly mounted on the right inner wall of the gearbox (3), the output shaft of the variable pitch motor (41) being fixedly connected to one end of one of the bidirectional screw rods (4) via a coupling, and a left displacement block (42) and a right displacement block (43) being respectively threadedly sleeved at both ends of the surface of the bidirectional screw rod (4) with the center as the boundary.

3. A frequency conversion cabinet cooling device according to claim 2, characterized in that: A left speed-changing conical belt reel (44) is rotatably sleeved on the right side surface of the left displacement block (42), and a right speed-changing conical belt reel (45) is rotatably sleeved on the left side surface of the right displacement block (43), and the outer surface of the right speed-changing conical belt reel (45) is plugged into the inner wall of the left speed-changing conical belt reel (44).

4. A frequency conversion cabinet cooling device according to claim 3, characterized in that: A drive motor (46) is fixedly mounted on the right side surface of one of the right displacement blocks (43); an output shaft of the drive motor (46) is fixedly connected to the right side surface of one of the right speed-changing conical belt pulleys (45) via a coupling; and a speed-changing output shaft (47) is rotatably sleeved on the right side surface of the other right displacement block (43).

5. A frequency conversion cabinet cooling device according to claim 4, characterized in that: One end of the speed change output shaft (47) is fixedly connected to the right side surface of the other right speed change conical belt disk (45), and the other end of the speed change output shaft (47) is rotatably sleeved with the right side surface of the gearbox (3) and extends into the interior of the installation frame (1), and the other end of the speed change output shaft (47) located on the right side of the installation frame (1) is fixedly sleeved with a fan blade (48).

6. A frequency conversion cabinet cooling device according to claim 5, characterized in that: A steel belt (49) for transmission connection is provided between the left speed-changing conical belt pulley (44) and the right speed-changing conical belt pulley (45); a sensing sheet (410) is fixedly mounted on the upper surface of the left displacement block (42); a laser distance sensor (411) is fixedly mounted on the upper surface of the right displacement block (43); and the outer surfaces of the left displacement block (42) and the right displacement block (43) are both slidably sleeved with the inner wall of the gearbox (3).

7. A frequency conversion cabinet cooling device according to claim 6, characterized in that: The right side surface of the sensing sheet (410) and the right side surface of the left displacement block (42) are on the same horizontal plane, the left side surface of the laser distance measuring sensor (411) and the left side surface of the right displacement block (43) are on the same horizontal plane, and adjacent bidirectional lead screws (4) are connected in transmission through external meshing of gears (412) and gears (412).

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