Motor frequency converter control device for coal washing workshop

Abstract

The utility model relates to the field of motor frequency converter control devices for coal washing workshops, in particular to a motor frequency converter control device for a coal washing workshop, which comprises a ventilation and heat dissipation mechanism consisting of an axial flow fan, a temperature conduction coil pipe, an air inlet pipe and the like, a dust washing mechanism consisting of a rotary filter screen group, a water mist nozzle and the like, and the like. Compared with the prior art, the device has the advantages that after external air enters the frequency converter, the dust washing mechanism is additionally arranged, and coal ash in the air is blocked through water mist and the wet rotary filter plate, so that the coal ash is separated from the air; a relatively clean air environment is provided for an electronic control part of the frequency converter, and normal use of the motor frequency converter is prevented from being affected by coverage of a large amount of dust.

Description

Technical Field

[0001] The utility model relates to the field of motor frequency converter control devices for coal washing workshops, and specifically refers to a motor frequency converter control device for coal washing workshops. Background Technique

[0002] A variable-frequency drive (VFD) is a power control device that applies frequency conversion technology and microelectronics technology to control AC motors by changing the operating power frequency of the motors. Since the internal electronic components of electrical equipment continuously generate heat during operation, and the high temperature will affect their operating efficiency, ventilation and heat dissipation mechanisms are usually provided.

[0003] Due to the environmental conditions in the coal washing workshop, the air contains a large amount of coal ash. When the ventilation and heat dissipation mechanism of the frequency converter sucks this air into the control device, dust will adhere to the electronic devices in the long term, affecting the operation of the motor frequency converter. Generally, a filter screen is set at the air inlet. However, due to the excessive dust in the coal washing workshop, the coal ash cannot be effectively blocked, and the filter screen will be blocked by coal ash in a short time, affecting the heat dissipation effect of the frequency converter. Therefore, a motor frequency converter control device for coal washing workshops is needed. Content of the Utility Model

[0004] I. Technical Problems to be Solved

[0005] The technical problem to be solved by the utility model is that due to the large amount of dust in the environment of the coal washing workshop, the general method of using a filter screen to prevent dust is no longer effective.

[0006] II. Technical Solutions

[0007] To solve the above technical problems, the technical solution provided by the utility model is: a motor frequency converter control device for a coal washing workshop, including a control box, a plurality of axial flow fans are connected to the top of the control box, and air inlets matched with the axial flow fans are connected to both sides of the bottom of the control box.

[0008] The air inlets are arranged at the left and right ends of the control box. A water supply pipe and a drainage pipe are respectively connected to the left and right sides of the bottom of the control box. A temperature conduction and heat dissipation mechanism matched with the water supply pipe and the drainage pipe is connected inside the bottom of the control box. A plurality of support shafts are rotatably connected between the temperature conduction and heat dissipation mechanism and the air inlets inside the control box. A plurality of filter plates are connected to the support shafts. A transmission shaft is rotatably connected to the outside of one side of the control box. A motor matched with the transmission shaft is connected to the outside of the control box. A worm and gear transmission mechanism is jointly connected between one end of the support shaft extending to the outside of the control box and the transmission shaft.

[0009] Furthermore, the heat conduction and dissipation mechanism includes a heat conduction coil pipe, and a first water pump is connected to the heat conduction coil pipe. Both ends of the heat conduction coil pipe are respectively communicated with a water supply pipe and a drainage pipe. The heat dissipation pipeline is designed in a coil shape, which increases the contact area between the internal water flow and the external air, and is more conducive to the heat dissipation and cooling of the components in the frequency converter. Water with a relatively low temperature is provided through the water supply pipe to continuously cool the heat conduction coil pipe, and the water after heat exchange is recovered and discharged through the discharge pipe.

[0010] Furthermore, a plurality of nozzles are connected to the front and back sides of the control box between the heat conduction and dissipation mechanism and the filter screen. The nozzles spray water flow or water mist, which diffuses and spreads. As it moves downward by gravity in the bottom space of the control box, it can capture dust in the air. And after falling on the filter plate, it will make the filter screen on the filter plate wet, and the rotating filter plate is more likely to capture the upward coal ash. A plurality of aggregate funnels that cooperate with the nozzles are connected downward at the bottom end of the control box, and a sewage discharge pipe communicated with the aggregate funnels is connected below the control box, which is used to collect the sewage carrying dust and discharge it centrally for treatment.

[0011] Furthermore, water pipes that cooperate with the nozzles are externally connected to the front and back sides of the control box. One end of the water pipe is communicated with the water supply pipe, and a second water pump is connected to the water pipe near the water supply pipe end, which is used to supply the water in the water supply pipe to each nozzle.

[0012] Furthermore, air pipes that cooperate with the air inlet are connected to both sides of the bottom of the control box. Usually, the content of coal ash in the upper-layer air is lower than that near the ground. One end of the air pipe far from the control box is bent upward, which is beneficial to the relatively low amount of dust-carrying air inhaled into the control box through the air inlet under the action of the axial flow fan.

[0013] III. Beneficial Effects

[0014] The advantages of the present utility model compared with the prior art are as follows: After the external air enters the frequency converter, a set of dust washing mechanism is added. Through the water mist and the wet rotating filter plate, the coal ash in the air is blocked, so as to separate the coal ash from the air, providing a relatively clean air environment for the electronic control components of the frequency converter and avoiding affecting the normal use of the motor frequency converter due to the coverage of a large amount of dust. Brief Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the external structure of a motor frequency converter control device for a coal washing plant of the present utility model.

[0016] Figure 2 It is a schematic diagram of the internal structure of a motor frequency converter control device for a coal washing plant of the present utility model Figure 1 .

[0017] Figure 3 is a schematic diagram of the internal structure of a motor frequency converter control device for a coal washing workshop of the present utility model Figure 2 .

[0018] Figure 4 is Figure 1 a schematic diagram of the structure of part A in

[0019] Figure 5 is Figure 2 a schematic diagram of the structure of part B in

[0020] As shown in the figure: 1. Control box, 2. Axial flow fan, 3. Air inlet, 4. Air duct, 5. Water supply pipe, 6. Drainage pipe, 7. Temperature guiding coil, 8. First water pump, 9. Water delivery pipe, 10. Second water pump, 11. Sprinkler head, 12. Aggregate funnel, 13. Sewage discharge pipe, 14. Support shaft, 15. Filter plate, 16. Transmission shaft, 17. Worm and worm gear transmission mechanism, 18. Motor. Specific embodiments

[0021] The following further elaborates on the present utility model in conjunction with the attached drawings.

[0022] Embodiment 1

[0023] Combined with the attached Figures 1-3 and the attached Figure 5 , to solve the above technical problems, the technical solution provided by the present utility model is: a motor 18 frequency converter control device for a coal washing workshop, including a control box 1, a plurality of axial flow fans 2 are connected and arranged at the top of the control box 1, air inlets 3 are connected and arranged on both sides of the bottom of the control box 1 and are matched with the axial flow fans 2, air ducts 4 are connected and arranged on both sides of the bottom of the control box 1 and are matched with the air inlets 3. Since the coal ash content in the upper layer of air is usually lower than that near the ground, one end of the air duct 4 far from the control box 1 is bent upward. This is beneficial to the fact that under the action of the axial flow fan 2, the amount of dust carried by the air inhaled into the control box 1 through the air inlet 3 is relatively low. The air inlets 3 are arranged at the left and right ends of the control box 1. A water supply pipe 5 and a drainage pipe 6 are respectively connected and arranged on the left and right sides of the bottom of the control box 1. A temperature guiding and heat dissipation mechanism matched with the water supply pipe 5 and the drainage pipe 6 is connected inside the bottom of the control box 1. The temperature guiding and heat dissipation mechanism includes a temperature guiding coil 7. A first water pump 8 is connected to the temperature guiding coil 7. Both ends of the temperature guiding coil 7 are respectively communicated with the water supply pipe 5 and the drainage pipe 6. The heat dissipation pipeline is designed in a coil shape, increasing the contact area between the internal water flow and the external air, which is more conducive to the heat dissipation and cooling of the components inside the frequency converter. Water with a relatively low temperature is provided through the water supply pipe 5 to continuously supply cold to the temperature guiding coil 7, and the water after heat exchange is recovered and discharged through the discharge pipe.

[0024] The operation of the axial flow fan 2 provides air circulation inside the control box 1, thereby discharging the air with a higher temperature inside the box, and replacing it with the air with a lower temperature from the outside sucked in through the air inlet 3, so as to achieve continuous heat dissipation of the frequency converter. The sucked cold air passes through the temperature guiding coil 7 and exchanges heat with the water with a lower temperature in the pipe, making its own temperature lower, thereby providing a heat dissipation effect for the electronic components inside the frequency converter. The water supply pipe 5 and the drain pipe 6 that continuously supply cold water circulation for the temperature guiding and heat dissipation mechanism are connected to institutions such as the main water pipe or water tank in the place. According to the objective use situation on site, a group of pipes can be connected in series with multiple such control devices.

[0025] Embodiment 2

[0026] Combined with the attached Figures 1-4 , a plurality of support shafts 14 are rotatably connected between the temperature guiding and heat dissipation mechanism and the air inlet 3 inside the control box 1. A plurality of filter plates 15 are connected to the support shafts 14. A transmission shaft 16 is rotatably connected to the outside of one side of the control box 1. A motor 18 that cooperates with the transmission shaft 16 is connected to the outside of the control box 1. A worm and gear transmission mechanism 17 is commonly connected between one end of the support shaft 14 extending to the outside of the control box 1 and the transmission shaft 16. A plurality of nozzles 11 are connected to the front and rear sides of the control box 1 between the temperature guiding and heat dissipation mechanism and the filter screen. The nozzles 11 spray water flow or water mist, which diffuses and spreads. As it falls downward by gravity in the bottom space of the control box 1, it can capture the dust in the air. After falling on the filter plate 15, it will make the filter screen on the filter plate 15 wet. The rotating filter plate 15 is more likely to capture the upward coal ash. The water supply pipes 9 that cooperate with the nozzles 11 are connected to the outside of the front and rear sides of the control box 1. One end of the water supply pipe 9 is communicated with the water supply pipe 5. A second water pump 10 is connected to the water supply pipe 9 near the water supply pipe 5 for supplying the water in the water supply pipe 5 to each nozzle 11. A plurality of aggregate funnels 12 that cooperate with the nozzles 11 are connected downward at the bottom end of the control box 1. A sewage discharge pipe 13 that is communicated with the aggregate funnel 12 is connected below the control box 1 for collecting the sewage carrying dust and discharging it centrally for treatment.

[0027] By means of the filter plate 15 arranged on the flow path of the inhaled air towards the electronic components in the control box 1, the coal ash in the inhaled air is blocked. Multiple rotating filter plates 15 are more conducive to effective capture. After the upper nozzle 11 provides water flow for wetting, the capture effect of the filter plate 15 is further improved. At the same time, the falling water flow or water mist can also adsorb the dust in the air and descend under the action of gravity to achieve the effect of separating from the gas in the air. It should be noted that the operating speed of the upper axial flow fan 2 should be reasonably set to avoid part of the water flow or water mist sprayed by the nozzle 11 rising to the position where the electronic devices are placed inside the top of the control box 1 due to the air extraction effect of the axial flow fan 2, causing unnecessary negative impacts. Since the filter plate 15 captures coal ash for a long time, mud blocks will inevitably accumulate on its surface, affecting the use. Within a certain period, the axial flow fan 2 is briefly stopped, and the filter plate 15 can be flushed by increasing the water spraying effect of the nozzle 11. In the design of this function implementation, the nozzle 11 can be selected to be able to spray water mist and also be able to perform outflow spraying, or the water mist nozzle 11 and the sprinkling nozzle 11 can be reasonably arranged at intervals. The setting of the sewage discharge pipe 13 for centralized sewage recovery in the site is similar to the water supply pipe 5 and the drainage pipe 6 mentioned above.

[0028] When the present utility model is specifically implemented, when the frequency converter control device of the motor 18 is operating, the frequency converter component as the control component of the motor 18 inside operates normally, and the axial flow fan 2 continuously starts to provide a heat dissipation effect for the inside of the frequency converter. The lower temperature conduction and heat dissipation mechanism provides a more significant heat dissipation effect through water cooling. At the same time, each nozzle 11 draws clear water from the water supply pipe 5 and sprays it inside the bottom of the box body. The support shaft 14 also drives the filter plate 15 to rotate. The water flowers or water mist diffused in the space can capture the coal ash in the inhaled air. The wet filter plate 15 rotates in the space and can also effectively filter out a large amount of coal ash in the air, preventing the dust from reaching the electronic components of the frequency converter and causing pollution to these precision devices, affecting the operation.

[0029] The above describes the present utility model and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design a structural manner and an embodiment similar to this technical solution without creative work without departing from the creative purpose of the present utility model, they shall fall within the protection scope of the present utility model.

Claims

1. A frequency converter control device for a motor (18) for a coal washing workshop, comprising a control box (1), a plurality of axial flow fans (2) being connected to the top of the control box (1), and air inlets (3) matching the axial flow fans (2) being connected to both sides of the bottom of the control box (1), characterized in that: The air inlet (3) is arranged at the left and right ends of the control box (1); the left and right sides of the bottom of the control box (1) are respectively connected to a water supply pipe (5) and a drainage pipe (6); the bottom of the control box (1) is connected to a heat conduction and heat dissipation mechanism that cooperates with the water supply pipe (5) and the drainage pipe (6); a plurality of support shafts (14) are rotatably connected between the heat conduction and heat dissipation mechanism and the air inlet (3) in the control box (1); a plurality of filter plates (15) are connected to the support shaft (14); a transmission shaft (16) is rotatably connected to the outside of one side of the control box (1); a motor (18) that cooperates with the transmission shaft (16) is connected to the outside of the control box (1); a worm gear transmission mechanism (17) is commonly connected between one end of the support shaft (14) extending to the outside of the control box (1) and the transmission shaft (16).

2. A frequency converter control device for a motor (18) for a coal washing workshop according to claim 1, characterized in that: The heat conduction and heat dissipation mechanism comprises a heat conduction coil (7), a first water pump (8) is connected to the heat conduction coil (7), and two ends of the heat conduction coil (7) are respectively connected to a water supply pipe (5) and a drainage pipe (6).

3. The frequency converter control device for a motor (18) for a coal washing workshop according to claim 1, characterized in that: The control box (1) is located between the heat conduction and heat dissipation mechanism and the filter screen and is connected to a plurality of nozzles (11) on both sides thereof; the bottom end of the control box (1) is downwardly connected to a plurality of material collecting funnels (12) matched with the nozzles (11); and a sewage discharge pipe (13) in communication with the material collecting funnel (12) is connected below the control box (1).

4. The frequency converter control device for a motor (18) for a coal washing workshop according to claim 2, characterized in that: The control box (1) is externally connected to the front and rear sides with a water pipe (9) matched with the nozzle (11); one end of the water pipe (9) is connected to the water supply pipe (5); and one end of the water pipe (9) close to the water supply pipe (5) is connected to a second water pump (10).

5. The frequency converter control device for a motor (18) for a coal washing workshop according to claim 1, characterized in that: Air ducts (4) matching the air inlet (3) are connected to both sides of the bottom of the control box (1), and the air duct (4) is bent upward at one end away from the control box (1).

Images