Cooling fan exhaust coefficient detection device for frequency converter maintenance

Abstract

The utility model discloses a cooling fan exhaust coefficient detection device for frequency converter maintenance, which belongs to the technical field of frequency converter maintenance and comprises a working box, an exhaust coefficient detection groove is embedded in the working box, and a detection mechanism capable of detecting the air speed and the air volume of a cooling fan is arranged in the exhaust coefficient detection groove. The detection mechanism comprises a rotating shaft, fan blades, a convex block, a rotating speed digital display instrument, a rotating speed sensor and a gas flow meter, the rotating shaft is rotationally connected into the exhaust coefficient detection groove, the fan blades are equidistantly and annularly nested outside the rotating shaft, one end of the rotating shaft extends to one side outside the working box, and the convex block is fixedly mounted on the surface of the rotating shaft. According to the utility model, through the detection mechanism, the air speed and the air volume of the cooling fan can be conveniently detected and visually displayed, so that a maintenance worker can quickly know the air exhaust performance of the cooling fan and judge whether the cooling fan needs to be replaced or not.

Description

Technical Field

[0001] The utility model belongs to the technical field of inverter maintenance, in particular to an exhaust coefficient detection device for a cooling fan used for inverter maintenance. Background Art

[0002] The inverter will generate a lot of heat during operation. If the heat cannot be dissipated in time, the internal temperature of the inverter will rise, which will affect its performance and life. A cooling fan is needed to take away the generated heat. The cooling fan is an important component for the inverter to dissipate heat. Therefore, the exhaust coefficient of the cooling fan needs to be tested when maintaining the inverter.

[0003] Among them, after searching, it was found that there is a patent number CN202223086495.3, which discloses a cooling fan detection device, including a detection box and a detection drive mechanism. The detection drive mechanism is arranged inside the detection box, and has the function of detecting and processing the sound generated by the cooling fan through the cooperation between the detection box and the sound sensor. The detection drive mechanism is convenient for taking out and fixing the cooling fan to avoid shaking of the cooling fan during the detection process. The use of a sealed door reduces the surrounding sound collected during detection, increases the detection effect, and thus improves the practicability of the detection device. The utility model has the advantages of simple structure and easy use.

[0004] However, after research, it was found that: the device does not have a structure for cleaning the cooling fan, and the dust adhered to the surface of the cooling fan will affect the working performance of the cooling fan, thereby affecting the detection results, and the device cannot detect the exhaust wind speed and air volume of the cooling fan, and cannot detect the exhaust coefficient of the cooling fan. Therefore, a new device is provided to solve this problem. Utility Model Content

[0005] The utility model aims to provide a cooling fan exhaust coefficient detection device for inverter maintenance in order to solve the problem that the exhaust coefficient of the cooling fan cannot be detected due to the lack of a structure for cleaning the surface of the cooling fan.

[0006] The technical solution adopted by the utility model is as follows: a device for detecting exhaust coefficient of a cooling fan for maintenance of a frequency converter, comprising a working box, wherein an exhaust coefficient detection slot is embedded in the working box;

[0007] The exhaust coefficient detection slot is internally provided with a detection mechanism capable of detecting the wind speed and air volume of the heat dissipation fan.

[0008] Wherein, the detection mechanism includes a rotating shaft, fan blades, a protrusion, a speed digital display, a speed sensor and a gas flow meter, the exhaust coefficient detection slot is rotatably connected with a rotating shaft, the outside of the rotating shaft is equidistantly nested and installed with fan blades, and one end of the rotating shaft extends to the outside of the working box, a protrusion is fixedly installed on the surface of the rotating shaft, a speed sensor is fixedly installed on the outside of the working box, and the end of the speed sensor corresponds to the protrusion, the protrusion is made of magnetic steel, a speed digital display is installed on the outside of the working box, a gas flow meter is installed at the outlet of the exhaust coefficient detection slot, the number of fan blades is six, and a positioning rod is slidably connected to the top of the entrance of the exhaust coefficient detection slot through a sliding groove, and the positioning rod is L-shaped, one end of the positioning rod extends to the inside of the exhaust coefficient detection slot and is fixedly installed with a pressure plate, and the pressure plate is arc-shaped, a limiting screw is rotatably connected to the top of the working box, and the other end of the positioning rod is nested and threadedly connected to the outside of the limiting screw.

[0009] Among them, a placement groove is embedded in the working box, and the placement groove is L-shaped, and the placement groove has two entrances, and the two entrances are respectively located above the working box and on one side of the working box. A dust blower is movably connected at the entrance of the placement groove above the working box, and a connecting pipe is movably connected at the entrance of the placement groove on one side of the working box. Shrapnel is symmetrically and elastically connected inside the connecting pipe, and the shrapnel is arranged in an arc shape. One end of the connecting pipe is rotatably connected to an air duct through a hollow turntable, and bristles are arranged around the air duct outlet. A micro motor is installed on one side of the connecting pipe, and the output shaft of the micro motor is transmission-connected to the air duct through a chain.

[0010] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0011] 1. In the utility model, the air duct outlet is in contact with the surface of the cooling fan, and the air duct is long enough to ensure a sufficient safety distance between the staff and the cooling fan, so as to avoid that the dust falls on the staff when the cooling fan is blown. The strong wind blown by the dust blower will blow off the dust on the surface of the cooling fan, and the micro motor will work at the same time to drive the air duct to rotate. The bristles at the air duct outlet will brush off the dust adhering to the surface of the cooling fan, so as to achieve the purpose of cleaning the cooling fan, avoid the dust of the cooling fan affecting the working effect of the cooling fan, and avoid affecting the result of the exhaust coefficient detection.

[0012] 2. In the present invention, the wind speed and air volume of the cooling fan can be easily detected and displayed intuitively through the detection mechanism, so that maintenance personnel can quickly understand the exhaust performance of the cooling fan and determine whether the cooling fan needs to be replaced.

[0013] 3. In the utility model, the connecting pipe is inserted into the outside of the air outlet pipe of the dust blower, and the spring is clamped on the outside of the air outlet pipe of the dust blower under the action of the spring force, so as to achieve the purpose of fixing the connecting pipe and the dust blower together, and the connection is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a partial three-dimensional structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the overall side section structure of the utility model;

[0016] Figure 3 For the utility model Figure 2 A schematic diagram of the enlarged structure at point A;

[0017] Figure 4 It is a schematic diagram of the front cross-section structure of part of the utility model;

[0018] Figure 5 It is a schematic diagram showing the circuit structure of the utility model.

[0019] Markings in the figure: 1. working box; 101. exhaust coefficient detection slot; 1011. rotating shaft; 1012. fan blade; 1013. bump; 102. positioning rod; 1021. pressure plate; 1022. limit screw; 103. speed digital display; 1031. speed sensor; 104. gas flow meter; 105. placement slot; 2. dust blower; 201. connecting pipe; 2011. shrapnel; 202. air duct; 2021. micro motor. DETAILED DESCRIPTION

[0020] 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.

[0021] In the utility model:

[0022] Reference Figure 1-5 , a cooling fan exhaust coefficient detection device for inverter maintenance, comprising a working box 1, wherein an exhaust coefficient detection slot 101 is embedded in the working box 1;

[0023] The exhaust coefficient detection slot 101 is internally provided with a detection mechanism capable of detecting the wind speed and air volume of the cooling fan.

[0024] Reference Figure 1 , 24. In this embodiment, the detection mechanism includes a rotating shaft 1011, a fan blade 1012, a protrusion 1013, a speed digital display 103, a speed sensor 1031 and a gas flow meter 104. The exhaust coefficient detection slot 101 is rotatably connected with the rotating shaft 1011, and the fan blades 1012 are equidistantly nested and installed around the outside of the rotating shaft 1011. One end of the rotating shaft 1011 extends to the outside of the working box 1. A protrusion 1013 is fixedly installed on the surface of the rotating shaft 1011. A speed sensor 1031 is fixedly installed on the outside of the working box 1, and the end of the speed sensor 1031 corresponds to the protrusion 1013. The protrusion 1013 is made of magnetic steel. A speed digital display 103 is installed on the outside of the working box 1. A gas flow meter 104 is installed at the outlet of the exhaust coefficient detection slot 101. The number of the fan blades 1012 is six;

[0025] The cooling fan of the inverter is removed and installed at the entrance of the exhaust coefficient detection slot 101, and the power of the cooling fan is turned on. The cooling fan blows wind into the exhaust coefficient detection slot 101. The wind flow pushes the fan blade 1012 to move, so that another fan blade 1012 is at a perpendicular angle to the wind direction. The six fan blades 1012 work alternately, so that the shaft 1011 rotates continuously, and the protrusion 1013 rotates simultaneously with the shaft 1011. The protrusion 1013 collides with the speed sensor 1031 every time it rotates one circle. The speed sensor 1031 outputs a pulse signal related to the rotation frequency and transmits the signal to the speed digital display 103. The speed digital display 103 displays the corresponding speed data. The gas flow meter 104 detects the air flow discharged by the cooling fan, thereby achieving the purpose of detecting the wind speed and air volume blown in by the cooling fan.

[0026] Reference Figure 1-2 In this embodiment, a positioning rod 102 is slidably connected to the top of the entrance of the exhaust coefficient detection slot 101 through a sliding slot, and the positioning rod 102 is set in an L shape, one end of the positioning rod 102 extends to the inside of the exhaust coefficient detection slot 101 and is fixedly installed with a pressure plate 1021, and the pressure plate 1021 is set in an arc shape, and a limiting screw 1022 is rotatably connected to the top of the working box 1, and the other end of the positioning rod 102 is nested and threadedly connected to the outside of the limiting screw 1022;

[0027] Place the cooling fan into the entrance of the exhaust coefficient detection slot 101, turn the limit screw 1022, and the positioning rod 102 moves along the limit screw 1022, so that the pressure plate 1021 is tightly pressed on the cooling fan, fixing the cooling fan at the entrance of the exhaust coefficient detection slot 101.

[0028] Reference Figure 1-3In this embodiment, a placement groove 105 is embedded inside the working box 1, and the placement groove 105 is L-shaped, and the placement groove 105 has two entrances, and the two entrances are respectively located above the working box 1 and on one side of the working box 1. A dust blower 2 is movably connected to the entrance of the placement groove 105 above the working box 1, and a connecting pipe 201 is movably connected to the entrance of the placement groove 105 on one side of the working box 1. A spring 2011 is symmetrically elastically connected inside the connecting pipe 201, and the spring 2011 is arranged in an arc shape;

[0029] Pull the dust blower 2 and the connecting pipe 201 out of the placement groove 105, and then insert the connecting pipe 201 to the outside of the air outlet duct of the dust blower 2. The spring piece 2011 is clamped on the outside of the air outlet duct of the dust blower 2 under the action of the spring force, thereby fixing the connecting pipe 201 and the dust blower 2 together.

[0030] Reference Figure 2-3 In this embodiment, one end of the connecting tube 201 is rotatably connected to the air duct 202 through a hollow turntable, and bristles are arranged around the outlet of the air duct 202. A micro motor 2021 is installed on one side of the connecting tube 201, and the output shaft of the micro motor 2021 is connected to the air duct 202 through a chain.

[0031] The cooling fan removed from the top of the inverter is placed on the ground so that the outlet of the air duct 202 is in contact with the surface of the cooling fan. The air duct 202 is long enough to ensure a safe distance between the staff and the cooling fan to prevent the dust from falling on the staff when blowing dust on the cooling fan. The dust blower 2 works and the strong wind blows off the dust on the surface of the cooling fan. The micro motor 221 works at the same time to drive the air duct 202 to rotate. The bristles at the outlet of the air duct 202 brush off the dust adhering to the surface of the cooling fan, thereby achieving the purpose of cleaning the cooling fan, preventing the dust on the cooling fan from affecting the working effect of the cooling fan, and at the same time avoiding affecting the result of the exhaust coefficient detection.

[0032] Reference Figure 1-5 In this embodiment, the speed digital display 103, the speed sensor 1031, and the gas flow meter 104 are all electrically connected to the external power supply through a switch, and the dust blower 2 and the micro motor 2021 are both electrically connected to the battery through their own switches.

[0033] Working principle: first, place the cooling fan removed from the top of the inverter on the ground, pull the dust blower 2 and the connecting pipe 201 out of the placement slot 105, and then insert the connecting pipe 201 into the outside of the air outlet duct of the dust blower 2. The spring 2011 is clamped on the outside of the air outlet duct of the dust blower 2 under the action of the spring force, so as to achieve the purpose of fixing the connecting pipe 201 and the dust blower 2 together. Then, the outlet of the air duct 202 is in contact with the surface of the cooling fan. The air duct 202 is long enough to ensure that there is a sufficient safety distance between the staff and the cooling fan to avoid that all the dust falls on the staff when blowing dust on the cooling fan. The dust blower 2 works, and the strong wind blown out will blow the dust off the surface of the cooling fan. The micro motor 221 works at the same time to drive the air duct 202 to rotate. The bristles at the outlet of the air duct 202 will brush off the dust adhering to the surface of the cooling fan, so as to achieve the purpose of cleaning the cooling fan. Then, the cooling fan is placed in the entrance of the exhaust coefficient detection slot 101, and the limit screw is turned. Rod 1022, the positioning rod 102 moves along the limit screw 1022, so that the pressure plate 1021 is tightly pressed above the cooling fan, and the cooling fan is fixed at the entrance of the exhaust coefficient detection slot 101, and finally the power of the cooling fan is turned on, and the cooling fan blows wind into the exhaust coefficient detection slot 101, and the wind flow pushes the fan blade 1012 to move, so that another fan blade 1012 is at a perpendicular angle to the wind direction, and the six fan blades 1012 work alternately, so that the rotating shaft 1011 rotates continuously, and the protrusion 1013 rotates simultaneously with the rotating shaft 1011, and the protrusion 1013 collides with the speed sensor 1031 every time it rotates one circle, and the speed sensor 1031 outputs a pulse signal related to the rotation frequency, and transmits the signal to the speed digital display 103, and the speed digital display 103 displays the corresponding speed data, and the gas flow meter 104 detects the air flow discharged by the cooling fan, thereby achieving the purpose of detecting the wind speed and air volume blown in by the cooling fan.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting exhaust coefficient of a cooling fan for maintenance of a frequency converter, comprising a working box (1), characterized in that: An exhaust coefficient detection slot (101) is embedded in the working box (1); The exhaust coefficient detection slot (101) is provided with a detection mechanism capable of detecting the wind speed and air volume of the cooling fan; The detection mechanism comprises a rotating shaft (1011), a fan blade (1012), a bump (1013), a rotation speed digital display (103), a rotation speed sensor (1031) and a gas flow meter (104); The exhaust coefficient detection slot (101) is rotatably connected to a rotating shaft (1011) inside, and fan blades (1012) are equidistantly nested and mounted around the rotating shaft (1011) outside, and one end of the rotating shaft (1011) extends to the outside of the working box (1), and a protrusion (1013) is fixedly mounted on the surface of the rotating shaft (1011), and a rotation speed sensor (1031) is fixedly mounted on the outside of the working box (1), and the end of the rotation speed sensor (1031) corresponds to the protrusion (1013), and the protrusion (1013) is made of magnetic steel, and a rotation speed digital display (103) is mounted on the outside of the working box (1), and a gas flow meter (104) is mounted at the outlet of the exhaust coefficient detection slot (101).

2. A device for detecting exhaust coefficient of a cooling fan for inverter maintenance as claimed in claim 1, characterized in that: The number of the fan blades (1012) is six.

3. A device for detecting exhaust coefficient of a cooling fan for inverter maintenance as claimed in claim 1, characterized in that: A positioning rod (102) is slidably connected to the top of the entrance of the exhaust coefficient detection slot (101) through a sliding slot, and the positioning rod (102) is arranged in an L shape. One end of the positioning rod (102) extends into the interior of the exhaust coefficient detection slot (101) and is fixedly installed with a pressure plate (1021), and the pressure plate (1021) is arranged in an arc shape. A limiting screw (1022) is rotatably connected to the top of the working box (1), and the other end of the positioning rod (102) is embedded in the thread and connected to the outside of the limiting screw (1022).

4. A device for detecting exhaust coefficient of a cooling fan for inverter maintenance as claimed in claim 1, characterized in that: The working box (1) is embedded with a placement groove (105) therein, and the placement groove (105) is arranged in an L shape. The placement groove (105) has two entrances, and the two entrances are respectively located above the working box (1) and on one side of the working box (1). A dust blower (2) is movably connected to the entrance of the placement groove (105) above the working box (1), and a connecting pipe (201) is movably connected to the entrance of the placement groove (105) on one side of the working box (1). A spring sheet (2011) is symmetrically elastically connected to the interior of the connecting pipe (201), and the spring sheet (2011) is arranged in an arc shape.

5. A device for detecting exhaust coefficient of a cooling fan for inverter maintenance as claimed in claim 4, characterized in that: One end of the connecting tube (201) is rotatably connected to the air duct (202) via a hollow turntable, and bristles are arranged around the outlet of the air duct (202). A micro motor (221) is installed on one side of the connecting tube (201), and the output shaft of the micro motor (221) is transmission-connected to the air duct (202) via a chain.

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