A system for cooling the motor of a local ventilation fan in an underground mine and its working method

Abstract

This invention discloses a system and its operating method for cooling the motor of a local ventilation fan in underground mines. The invention employs the principle of vortex tubes, installing a vortex tube cooler on the outer casing of the local ventilation fan. Compressed air from the underground compressed air pipeline generates a cool airflow that blows towards the motor, carrying away the heat generated during motor operation and achieving the purpose of cooling the motor. This invention, through cooling with a vortex tube cooler, overcomes the shortcomings of traditional cooling methods that lack sufficient cooling capacity and solves the problem of inadequate cooling in high-temperature mine local ventilation fans. The invention is driven by compressed air, making it safe to use in high-gas mines. The vortex tube cooler of this invention has a simple structure, no moving parts, is not easily damaged, and only requires compressed air for cooling.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of roadway driving ventilation, and in particular to a system for cooling a motor of an underground local fan and a working method thereof. BACKGROUND

[0002] In the process of mine production, in order to prepare new levels, new mining areas and stoping working faces, a large number of shafts and roadways must be driven. In order to supply fresh air for personnel, dilute gas and harmful gases and mine dust generated after blasting at the driving working face, and create good climate conditions, ventilation must be carried out at the driving working face. This kind of ventilation is called local ventilation or driving ventilation. There are mainly three methods of local ventilation: using mine full air pressure ventilation, water or air ejector ventilation, and local fan ventilation.

[0003] Local fan ventilation is a widely used driving ventilation method in coal mines in China, which can be divided into pressure-in type, extraction type and mixed type. The driving working face cannot obtain enough fresh air by the ground-mounted fan. In order to provide enough fresh air for the driving working face for personnel to breathe, dilute and remove gunpowder smoke, dilute and remove toxic and harmful gases, heat and water vapor, etc., a local fan is installed in the roadway at a certain distance from the driving working face, and a wind pipe is connected to the outlet of the local fan to send the air to the driving working face. The local fan undertakes the important task of sending air to the driving working face day and night. In order to ensure the fresh air flow at the driving working face, the local fan must be in normal operation. No matter whether the driving working face is in normal production or shift change, the air supply to the driving working face must be ensured. The local fan will accelerate the wear of parts due to the high temperature accumulated during continuous operation, which will affect the service life of the machine. At present, the cooling of the local fan is achieved by the current collector sucking in the air flow, quickly flowing through the surface of the motor, and then flowing through the diffuser cylinder into the wind pipe to blow to the driving working face. This method is affected by the air temperature in the roadway, and cannot effectively cool the motor in high-temperature mines. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art.

[0005] To this end, an embodiment of the present application proposes a system for cooling a motor of an underground local fan and a working method thereof.

[0006] In one aspect, the present application proposes a system for cooling a motor of an underground local fan, comprising:

[0007] A vortex tube refrigerator is fixedly arranged on a local ventilator housing, the vortex tube refrigerator comprises an air inlet, a vortex chamber, a hot end tube and a cold end tube, the hot end tube and the cold end tube are arranged at two ends of the vortex chamber, and the cold end tube is connected to a collector of the local ventilator.

[0008] A compressed air source is arranged to provide compressed air for the vortex tube refrigerator, and the compressed air generates cold air flow and hot air flow after entering the vortex chamber through the air inlet.

[0009] A wind drum is arranged at an outlet end of a diffusion drum of the local ventilator, and part of the hot air flow flows to the outlet end of the diffusion drum after flowing out of the hot end tube, and the cold air flow flows to the wind drum after sequentially flowing through the collector, a motor housing of the local ventilator and the diffusion drum.

[0010] In some embodiments, the compressed air source is provided by a compressed air pipeline arranged in a roadway.

[0011] In some embodiments, a first valve, a pressure gauge and a filter are sequentially arranged between the compressed air pipeline and the air inlet of the vortex tube refrigerator.

[0012] In some embodiments, a flow control valve is arranged at the outlet of the hot end tube, and the proportion of the cold air flow and the hot air flow is adjusted by the flow control valve to adjust the temperature and flow of the corresponding air flow.

[0013] In some embodiments, the outlet of the hot end tube is connected to a flow divider.

[0014] In some embodiments, the hot air flow is divided into two paths after passing through the flow divider, the first path of the hot air flow flows to the outlet end of the diffusion drum, and the second path of the hot air flow flows out to the air in the roadway after passing through a third valve.

[0015] In some embodiments, a second valve is arranged on a pipeline between the flow divider and the diffusion drum.

[0016] In some embodiments, a thermometer is arranged at the outlet end of the diffusion drum, and the temperature of the air flow flowing into the wind drum is adjusted by adjusting the second valve and the third valve.

[0017] In some embodiments, the collector is arranged at a front end of an impeller of the local ventilator, and a motor of the local ventilator drives the impeller to rotate to suck in the cold air flow on one side of the collector.

[0018] In another aspect, the application provides a working method of a system for cooling a motor of a local ventilator in a mine, comprising the following steps:

[0019] Compressed air enters the vortex chamber through the air inlet of the vortex tube refrigerator to generate cold air flow and hot air flow;

[0020] The cold air flow flows through the current collector, the motor housing and the diffusion cylinder in sequence and then flows to the air duct;

[0021] Part of the hot air flow flows to the outlet end of the diffusion cylinder to adjust the temperature of the air flow flowing into the air duct.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] The present application uses the principle of the vortex tube, installs the vortex tube refrigerator on the local ventilation machine housing, uses the compressed air in the underground compressed air pipeline, generates cold air flow blowing to the motor, carries away the heat generated by the motor operation, and achieves the purpose of cooling the motor.

[0024] Part of the hot air flow generated by the vortex tube refrigerator flows to the diffusion cylinder of the local ventilation machine and mixes with the cold air flow, thereby adjusting the air temperature flowing into the air duct, providing a comfortable working environment for the tunneling working face, and the other part of the hot air flow can be directly diffused into the air in the roadway.

[0025] The present application changes the insufficient cooling capacity of the traditional cooling mode, solves the problem that the local ventilation machine in the high-temperature mine cannot be fully cooled, and uses compressed air to drive, which can still be safely used in high-gas mines. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0027] Fig. 1 The present application is a schematic diagram of a system for cooling the motor of the underground local ventilation machine;

[0028] Fig. 2 The present application is a schematic diagram of a system for cooling the motor of the underground local ventilation machine;

[0029] REFERENCE SIGNS:

[0030] Compressed air source 1, air inlet 2, vortex chamber 3, hot end tube 4, cold end tube 5, flow divider 6, thermometer 7, current collector 8, motor 9, diffusion cylinder 10, air duct 11, second valve 12, third valve 13, compressed air pipeline 14, first valve 15, pressure gauge 16, filter 17. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] The following description, with reference to the accompanying drawings, describes a system for cooling the motor of a local ventilation fan in a well, and its operating method, according to an embodiment of the present invention.

[0033] like Figs. 1-2 As shown, the system for cooling the motor of a local ventilation fan in a well according to the present invention includes a vortex tube cooler, a compressed air source 1 and a duct 11, wherein the compressed air source 1 provides compressed air to the vortex tube cooler.

[0034] The vortex tube cooler is fixedly installed on the housing of the local ventilator. The vortex tube cooler includes an air inlet 2, a vortex chamber 3, a hot end tube 4, and a cold end tube 5. The hot end tube 4 and the cold end tube 5 are distributed at both ends of the vortex chamber 3. The outlet of the cold end tube 5 is connected to the collector 8 of the local ventilator.

[0035] Specifically, the local ventilation fan is installed in the roadway at a certain distance from the working face. The vortex tube cooler adopts the vortex tube principle and, after processing, can be applied underground. The vortex tube cooler is fixedly connected to the outer shell of the local ventilation fan. The vortex tube cooler includes an inlet 2, a vortex chamber 3, a hot end pipe 4, and a cold end pipe 5. The hot end pipe 4 and cold end pipe 5 are distributed at both ends of the vortex chamber 3 and are both connected to the vortex chamber 3. Compressed air enters the vortex chamber 3 of the vortex tube cooler through the inlet 2, generating cold and hot airflows in the vortex chamber 3. The cold airflow flows out through the cold end pipe 5, and the hot airflow flows out through the hot end pipe 4. The local ventilation fan includes a collector 8, a motor 9, and a diffuser 10. The collector 8 is located at the front end of the impeller, the motor 9 is located downstream of the collector 8, and the diffuser 10 is located downstream of the motor 9. The outlet end of the cold end pipe 5 is connected to the collector 8. A flexible hose connects the cold end pipe 5 to the collector 8. After flowing out of the cold end pipe 5, the cold air flows to the collector 8. Since the collector 8 is located at the front end of the impeller of the local ventilator, the motor 9 drives the impeller to rotate, thereby drawing the cold air into the local ventilator from one side of the collector 8. After flowing out of the cold end pipe 5, the cold air flows sequentially through the collector 8 of the local ventilator, the housing of the motor 9 of the local ventilator, and the diffuser 10 of the local ventilator, finally flowing into the duct 11. This cools the motor 9 of the local ventilator, allowing the local ventilator to operate continuously and normally.

[0036] The flow control valve is arranged at the outlet of the hot end pipe 4, and the proportion of the cold air flow and the hot air flow is adjusted through the flow control valve to adjust the temperature and flow of the corresponding air flow. Specifically, the flow control valve is arranged at the outlet end of the hot end pipe 4, and the flow of the hot air flow flowing out of the hot end pipe 4 can be adjusted by adjusting the opening degree of the flow control valve, so that the flow proportion of the hot air flow and the cold air flow can be adjusted, and the temperature and flow of the hot air flow and the cold air flow are further adjusted. It can be understood that the temperature and flow of the hot air flow and the cold air flow can be adjusted according to actual needs in actual work.

[0037] Here, the principle of the vortex tube refrigerator is briefly introduced. After the compressed air is injected into the vortex chamber 3 of the vortex tube refrigerator, the air flow rotates at a speed of up to one million revolutions per minute to the hot gas end outlet of the vortex tube. A part of the air flow flows out through the control valve, and the remaining air is blocked and reversely rotates at the same speed in the inner circle of the original air flow, and flows to the cold gas end of the vortex tube. In this process, heat exchange occurs between the two air flows, the inner ring air flow becomes very cold, and the outer ring air flow becomes very hot.

[0038] The air duct 11 is connected to the outlet end of the diffusion duct 10 arranged at the local ventilator. After part of the hot air flow flows out through the hot end pipe 4, it flows to the outlet end of the diffusion duct 10. After the cold air flow flows out through the cold end pipe 5, it flows through the flow collector 8, the shell of the motor 9 of the local ventilator, and the diffusion duct 10 in turn, and then flows to the air duct 11.

[0039] Specifically, the air duct 11 is arranged at the outlet end of the diffusion duct 10, and the air flowing through the air duct 11 finally flows to the tunneling working face, thereby providing a comfortable air environment for the workers. The local ventilator introduces the cold air flow, so that after the cold air flow flows out through the cold end pipe 5, it flows through the flow collector 8, the shell of the motor 9 of the local ventilator, and the diffusion duct 10 in turn, and then flows to the air duct 11. The cold air flow flowing through the shell of the motor 9 of the local ventilator is cooled, and then flows to the air duct 11 through the diffusion duct 10. The air flowing through the air duct 11 flows to the tunneling working face. The temperature of the cold air flow generated by the compressed air in the vortex tube refrigerator is below -10℃, and the temperature of the hot air flow is above 60℃. The temperature of the cold air flow flowing through the shell of the motor 9 of the local ventilator is still relatively low. If this part of the cold air flow is directly introduced into the air duct 11 without temperature adjustment, the temperature of the tunneling working face is relatively low, which is not suitable for the working environment of the workers. In view of this situation, part of the hot air flow is introduced into the outlet end of the diffusion duct 10, so that the cold air flow and the hot air flow are mixed at the outlet end of the diffusion duct 10, thereby adjusting the temperature of the air finally flowing to the air duct 11, and providing a comfortable working environment for the workers.

[0040] The outlet of the hot end pipe 4 is connected to the flow divider 6. After the hot air flow passes through the flow divider 6, it is divided into two paths. The first path of the hot air flow flows to the outlet end of the diffusion duct 10, and the second path of the hot air flow flows through the third valve 13 and is discharged into the air in the tunnel.

[0041] Specifically, the inlet end of the flow divider 6 is connected to the outlet end of the hot-end tube 4, and the hot-end tube 4 and the flow divider 6 can be connected by a soft rubber tube. After the hot air flow flows out of the hot-end tube 4, it flows to the flow divider 6. The hot air flow is divided into two paths at the outlet end of the flow divider 6. The first path of the hot air flow flows to the outlet end of the diffusion cylinder 10. The first path of the hot air flow mixes with the cold air flow at the outlet end of the diffusion cylinder 10 to adjust the air temperature flowing to the air duct 11. The second path of the hot air flow is discharged to the air in the roadway through the third valve 13, that is, the excess hot air flow is discharged to the air in the roadway through the third valve 13. The flow divider 6 and the third valve 13 can be connected by a soft rubber tube.

[0042] The second valve 12 is arranged on the pipeline between the flow divider 6 and the diffusion cylinder 10. The thermometer 7 is arranged at the outlet end of the diffusion cylinder 10. The air temperature flowing into the air duct 11 is adjusted by adjusting the second valve 12 and the third valve 13.

[0043] Specifically, one end of the flow divider 6 is connected to the diffusion cylinder 10, and the flow divider 6 and the diffusion cylinder 10 can be connected by a soft rubber tube. The second valve 12 is arranged on the pipeline between the flow divider 6 and the diffusion cylinder 10. The flow of the hot air flowing to the diffusion cylinder 10 can be adjusted by adjusting the second valve 12. The thermometer 7 is arranged at the outlet end of the diffusion cylinder 10 to test the temperature of the mixed hot air and cold air. The air temperature flowing into the air duct 11 is adjusted by adjusting the second valve 12 and the third valve 13, so that the air temperature flowing into the air duct 11 is controlled within a suitable range, and a comfortable working environment is provided for the workers at the tunneling working face. When the opening degree of the second valve 12 is increased and the opening degree of the third valve 13 is reduced, the air temperature flowing into the air duct 11 is increased. When the opening degree of the second valve 12 is reduced and the opening degree of the third valve 13 is increased, the air temperature flowing into the air duct 11 is reduced. In some embodiments, the air temperature flowing into the air duct 11 is controlled at 24-28°C.

[0044] The compressed air source 1 provides compressed air for the vortex tube refrigerator. After the compressed air enters the vortex chamber 3 through the air inlet 2, cold air flow and hot air flow are generated. In some embodiments, the compressed air source 1 is provided by the compressed air pipeline 14 arranged in the roadway. According to the requirements of the coal mine safety regulations, the compressed air pipeline 14, water supply pipeline and the like are arranged along one side of the roadway in the underground roadway. The compressed air pipeline 14 in the roadway provides compressed air for the roadway, and can also provide compressed air for the vortex tube refrigerator.

[0045] The first valve 15, the pressure gauge 16 and the filter 17 are sequentially arranged between the compressed air pipeline 14 and the air inlet 2 of the vortex tube refrigerator in an upstream-downstream manner. Specifically, the compressed air pipeline 14 is connected to the air inlet 2 of the vortex tube refrigerator, the compressed air pipeline 14 and the air inlet 2 of the vortex tube refrigerator can be connected through a soft rubber tube, the first valve 15, the pressure gauge 16 and the filter 17 are sequentially arranged between the compressed air pipeline 14 and the air inlet 2 in an upstream-downstream manner, the first valve 15 is used for adjusting the compressed air flow of the compressed air pipeline 14, so that the pressure of the compressed air entering the air inlet 2 of the vortex tube refrigerator can be adjusted, the pressure gauge 16 is used for testing the pressure of the compressed air at the outlet end of the first valve 15, and the filter 17 is used for filtering impurities in the compressed air.

[0046] The working method of the system for cooling the motor of the underground local ventilator comprises the following steps: compressed air enters a vortex chamber 3 of a vortex tube refrigerator through an air inlet 2 of the vortex tube refrigerator to generate cold air flow and hot air flow; the cold air flow flows to an air duct 11 through a flow collector 8, a motor shell and a diffusion cylinder 10 in sequence; and part of the hot air flow flows to an outlet end of the diffusion cylinder 10 to adjust the air temperature flowing into the air duct 11.

[0047] Specifically, the local ventilator is arranged in a roadway at a distance from a tunneling working face, the vortex tube refrigerator is fixedly connected to the local ventilator shell, the vortex tube refrigerator comprises an air inlet 2, a vortex chamber 3, a hot end pipe 4 and a cold end pipe 5, the hot end pipe 4 and the cold end pipe 5 are arranged at two ends of the vortex chamber 3 and are in communication with the vortex chamber 3, compressed air enters the vortex chamber 3 of the vortex tube refrigerator through the air inlet 2, cold air flow and hot air flow are generated in the vortex chamber 3, the cold air flow flows out through the cold end pipe 5, and the hot air flow flows out through the hot end pipe 4; the flow collector 8 is arranged at a front end of an impeller of the local ventilator, the motor 9 drives the impeller to rotate, so that the cold air flow is sucked into the local ventilator on one side of the flow collector 8, the cold air flow flows out through the cold end pipe 5 and sequentially flows through the flow collector 8 of the local ventilator, a shell of the motor 9 of the local ventilator and a diffusion cylinder 10 of the local ventilator, and finally flows to the air duct 11, so as to take away heat generated in the working process of the motor 9, cool the motor 9 of the local ventilator and enable the local ventilator to continuously and normally operate; part of the hot air flow flows to the outlet end of the diffusion cylinder 10, mixes with the cold air flow at the outlet end of the diffusion cylinder 10 and adjusts the air temperature flowing into the air duct 11, the air flowing through the air duct 11 flows to the tunneling working face, and thus a comfortable working environment is provided for workers at the tunneling working face.

[0048] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the description of the specification, the illustrative description of the above terms can be directed to different embodiments or examples. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0049] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0050] Although embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A system for cooling a motor of a local fan in a mine, characterized in that, It comprises: A vortex tube refrigerator fixedly arranged on a local ventilator shell, the vortex tube refrigerator comprising an air inlet, a vortex chamber, a hot-end tube and a cold-end tube, the hot-end tube and the cold-end tube being distributed at two ends of the vortex chamber, the cold-end tube outlet being connected to a flow collector of the local ventilator, a flow control valve being arranged at the hot-end tube outlet, the proportion of cold air flow and hot air flow being adjusted by the flow control valve to adjust the temperature and flow of the corresponding air flow, the hot-end tube outlet being connected to a flow divider, the hot air flow being divided into two paths after passing through the flow divider, the first path of the hot air flow flowing to an outlet end of a diffusion cylinder, and the second path of the hot air flow flowing to the airway after passing through a third valve; A compressed air source, the compressed air source providing compressed air for the vortex tube refrigerator, the compressed air generating cold air flow and hot air flow after entering the vortex chamber through the air inlet; A wind cylinder connected to the outlet end of the diffusion cylinder of the local ventilator, part of the hot air flow flowing to the outlet end of the diffusion cylinder after flowing out of the hot-end tube, and the cold air flow flowing to the wind cylinder after sequentially flowing through the flow collector, the motor shell of the local ventilator and the diffusion cylinder, The working method of the system comprises the following steps: The compressed air enters the vortex chamber through the air inlet of the vortex tube refrigerator to generate cold air flow and hot air flow; The cold air flow flows to the wind cylinder after sequentially flowing through the flow collector, the motor shell and the diffusion cylinder; Part of the hot air flow flows to the outlet end of the diffusion cylinder to adjust the air flow temperature flowing into the wind cylinder.

2. The system of claim 1, wherein, The compressed air source is provided by a compressed air pipeline arranged in the airway.

3. The system of claim 2, wherein, A first valve, a pressure gauge and a filter are sequentially arranged between the compressed air pipeline and the air inlet of the vortex tube refrigerator.

4. The system of claim 1, wherein, A second valve is arranged on the pipeline between the flow divider and the diffusion cylinder.

5. The system of claim 4, wherein, A thermometer is arranged at the outlet end of the diffusion cylinder, and the air flow temperature flowing into the wind cylinder is adjusted by adjusting the second valve and the third valve.

6. The system of claim 1, wherein, The flow collector is arranged at the front end of the impeller of the local ventilator, and the motor of the local ventilator drives the rotation of the impeller to suck in the cold air flow on one side of the flow collector.

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