Automatic reset type air door

Abstract

The utility model relates to an automatic reset type air door which is arranged on the top face of a heat extraction platform used for extracting mine return air waste heat and covers a ventilation opening of the heat extraction platform. The automatic reset type air door comprises two door plates which are symmetrically arranged, the bottom ends of the two door plates are pivoted to the top face in a freely rotatable mode through door pivots across a ventilation opening, and the top ends of the two door plates abut against each other in the closed state; the two pulley assemblies comprise pulley blocks, ropes, heavy hammers and supporting columns, the two pulley assemblies are symmetrically arranged across the door plate and the ventilation opening, the pulley blocks are arranged at the top ends of the supporting columns, the ropes are wound and hung on the pulley blocks, one ends of the ropes are connected to the door plate, and the heavy hammers are hung at the other ends of the ropes; the two limiting stoppers are symmetrically arranged across the door plates and the ventilation opening and are arranged adjacent to the door plates, when the two door plates are opened, the two limiting stoppers limit the opening positions of the two door plates correspondingly, and when the two door plates are in the opening state, mine return air can be exhausted through the ventilation opening.

Description

Technical Field

[0001] The utility model relates to an automatic reset type air door, in particular to an automatic reset type air door used for a mine return air heat extraction platform. Background Art

[0002] With the efforts of relevant national departments to reduce energy consumption and emissions in mines and the goal of building green mines, the waste heat of mine return air is gradually being used to replace the traditional boiler heating method as the main heat source for mine sites. The mine ventilation system is crucial to the safe production of mines. When using the waste heat of mine return air, it is necessary to set up a return air heat collection platform and a return air heat exchanger on the mine return air diffusion tower. Utility Model Content

[0003] Problems to be solved by the utility model

[0004] The return air heat extraction platform and the return air heat exchanger are arranged on the mine return air diffusion tower. The added return air heat exchanger will increase the ventilation resistance during operation. As the operation time continues, the ventilation resistance will become larger and larger, affecting the safe operation of the ventilator. The utility model is completed in view of the above actual situation, and the main purpose is to provide an automatic reset damper for the mine return air heat extraction platform.

[0005] Solutions for solving problems

[0006] An automatic reset damper is arranged on the top surface of a heat extraction platform for extracting waste heat from return air in a mine, covering the ventilation opening of the heat extraction platform, and the automatic reset damper is characterized in that it comprises: two door panels, the two door panels are symmetrically arranged, the bottom ends of the two door panels are pivotally connected to the top surface in a rotatable manner across the ventilation opening by means of a door hinge, and the top ends of the two door panels are in contact with each other in a closed state; two pulley assemblies, the pulley assemblies comprising a pulley block, a rope, a heavy hammer and a supporting column, the two pulley assemblies are spaced apart from the door The plate and the vent are symmetrically arranged, the pulley block is arranged at the top of the supporting column, the rope is hung around the pulley block, one end of the rope is connected to the door plate, and the other end is hung with the weight; and two limiters, the two limiters are symmetrically arranged across the door plate and the vent, and are arranged adjacent to the door plates, when the two door plates are opened, the two limiters respectively limit the opening positions of the two door plates, when the two door plates are in the open state, the mine return air can be discharged through the vent.

[0007] The automatic reset damper is characterized in that when the pressure difference between the inside and outside of the heating platform exceeds a predetermined pressure, the two door panels open, and when the pressure difference between the inside and outside of the heating platform is below the predetermined pressure, the two door panels close.

[0008] The automatic reset damper is characterized in that when the two door panels are in a closed state, the angle formed by the top ends of the two door panels is 90°.

[0009] The automatic reset damper is characterized in that when the door panel is opened, the limiter limits the opening position of the door panel.

[0010] The automatic reset damper is characterized in that, when the door panel is in an open state, the limiter makes the angle between the inner side surface of the door panel and the top surface be greater than 80° and less than 90°.

[0011] The automatic reset damper is characterized in that the connection point between the rope and the door panel is arranged at the center point or the center of gravity of the door panel.

[0012] The automatic reset damper is characterized in that the weight of the weight can be adjusted so that the door panel and the weight are in a dynamic balance state.

[0013] The automatic reset damper is characterized in that the limiter is arranged on an extension line of the top surface that is perpendicular to the center of the length direction of the door hinge.

[0014] The automatic reset damper is characterized in that the support column is arranged on an extension line of the top surface that is perpendicular to the center of the length direction of the door hinge.

[0015] The automatic reset damper is characterized in that the pulley block includes two fixed pulleys, and the two fixed pulleys are respectively arranged on both sides of the top end of the support column horizontally with the extension line.

[0016] Effect of utility model

[0017] According to the automatic reset damper, it can be ensured that the mine ventilation fan system will not be affected in safe operation due to the increase of ventilation resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram showing the automatic reset damper used for the mine return air heat extraction platform in the present embodiment when it is in a closed state.

[0019] Figure 2 It is a schematic diagram showing the automatic reset damper for the mine return air heat extraction platform according to the present embodiment when it is in an open state. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present utility model clearer, the implementation mode of the present utility model will be described in detail below with reference to the accompanying drawings.

[0021] <Implementation Method>

[0022] In this embodiment, if Figure 1 As shown, a heat extraction platform 1 is arranged above the diffusion tower 5, and the diffusion tower 5 is connected to the heat extraction platform 1. A plurality of return air heat exchangers 2 are arranged in the heat extraction platform 1, and the ventilator 6 extracts the mine return air from the underground through the diffusion tower 5 to the heat extraction platform 1. The return air heat exchanger 2 extracts heat from the mine return air extracted to the heat extraction platform 1 and discharges it. A windshield wall 4 is arranged on the periphery of the heat extraction platform 1.

[0023] According to the relevant industry specifications, when using the waste heat of the mine return air, the maximum ventilation resistance of the heat extraction device should be less than or equal to the specified pressure, such as 200 Pa. For example, the wind resistance of the return air heat exchanger 2 itself is 100 Pa, and the initial ventilation resistance is 100 Pa. The mine exhaust contains a certain amount of coal dust, etc., which accumulates on the windward side of the heat exchanger during long-term operation, resulting in a reduction in the ventilation area and an increase in wind resistance. Due to the failure to clean the coal dust on the surface of the heat exchanger in time, the ventilation resistance is greater than 200 Pa, affecting the safe operation of the mine ventilator system.

[0024] In this embodiment, for the safe operation of the mine ventilation system, an automatic reset damper 3 is provided on the top surface of the heat platform 1. Preferably, the air outlet of the diffusion tower 5 is provided at the center of the bottom surface of the heat platform 1, and a vent 34 is provided at the center of the top surface of the heat platform 1 opposite to the air outlet of the diffusion tower 5, and an automatic reset damper 3 is provided on the top surface of the heat platform 1. Return air heat exchangers 2 are provided on both sides of the horizontal direction of the heat platform 1, and the central part of the heat platform 1 is a ventilation space. When the automatic reset damper 3 is closed, the automatic reset damper 3 blocks the vent 34, and the mine return air from the air outlet of the diffusion tower 5 passes through the ventilation space and the return air heat exchangers 2 on both sides of the heat platform 1 and is discharged. When the automatic reset damper 3 is opened, the mine return air from the air outlet of the diffusion tower 5 is discharged directly from the vent 34 through the ventilation space of the heat platform 1.

[0025] like Figure 1 As shown, the automatic reset damper 3 includes two door panels 31 , two limiters 32 and two pulley assemblies 33 . Figure 1 In the figure, the door panel 31L, the limiter 32L and the pulley assembly 33L on one side and the door panel 31R, the limiter 32R and the pulley assembly 33R on the other side are symmetrically arranged with the vertical plane passing through the top ends of the door panels 31L and 31R as the symmetry plane.

[0026] The components of the automatic reset damper 3 are described in detail below.

[0027] (Door panel)

[0028] The two door panels 31L and 31R are symmetrically arranged, and the lower ends of the two door panels 31L and 31R are fixedly spaced apart, and are pivotally connected to the top surface of the heat extraction platform 1 by the door hinges 35L and 35R in a freely rotatable manner. The two door hinges 35L and 35R are respectively arranged on both sides of the vent 34. The top ends of the two door panels 31L and 31R are in contact with each other in the closed state, and the mine return air will not be discharged from the vent 34. The angle formed at the top ends of the two door panels 31L and 31R in the closed state is not particularly limited, and is preferably 90°. When the two door panels 31L and 31R are opened, they rotate with the two door hinges 35L and 35R as the rotation center, and open to the left and right sides, thereby switching from the closed state to the open state, so that the mine return air can be discharged through the vent 34. The material of the door panel 31 is not particularly limited. It is preferably a lightweight plate that can block the wind, such as a resin plate or an alloy plate. It is more preferably a material that does not chemically react with the components in the mine return air and is thus corrosion-resistant, such as a stainless steel plate. It can also be a plate-like material formed by coating on a frame.

[0029] (Pulley assembly)

[0030] The two pulley assemblies 33L and 33R are respectively arranged on both sides of the door panels 31L and 31R. One of the pulley assemblies 33L is taken as an example for description. The other pulley assembly 33R is designed to be symmetrical with the pulley assembly 33L, and will not be described in detail here. The pulley assembly 33L includes a pulley block 331L, a rope 332L, a weight 333L and a support column 334L. The bottom end of the support column 334L is arranged on the outside of the door panel 31L, which is far away from the symmetry plane. Preferably, it is arranged on an extension line perpendicular to the length direction of the door pivot 35, which is drawn from the center point of the top surface to the center point of the length direction of the door pivot 35. The pulley block 331L is two fixed pulleys, and the two fixed pulleys are respectively arranged on both sides of the top end of the support column 334L horizontally with the extension line. The rope 332L is hung around the pulley block 331L, and one end of the rope 332L on the door panel 31L side is connected to the door panel 31L, and the other end is hung with a weight 333L. The connection point between the rope 332L and the door panel 31L is preferably provided at the center point (usually also the center of gravity) of the door panel 31L, or at a portion above the center point (center of gravity).

[0031] When the pressure difference between the inside and outside of the heat extraction platform 1 exceeds the predetermined pressure difference, the thrust generated by the pressure difference and the weight of the weight 333L act on the door panel 31L via the rope 332L and the pulley block 331L, and the door panel 31L is pulled by the rope 332L and rotates to the left with the door hinge 35L as the axis. Correspondingly, the door panel 31R is pulled by the rope 332R and rotates to the right with the door hinge 35R as the axis. Therefore, the automatic reset damper 3 is opened, and the mine return air from the diffusion tower 5 passes through the ventilation space of the heat extraction platform 1 and is directly discharged from the vent 34. Since there is no obstruction, reduction in diameter, turning, etc. on the exhaust path, the exhaust is unobstructed, which can maximize the ventilation efficiency, so that the pressure difference between the inside and outside of the heat extraction platform 1 is restored to below the predetermined pressure difference as soon as possible, ensuring the safety of the mine.

[0032] When the pressure difference between the inside and outside of the heat extraction platform 1 is restored to below the predetermined pressure difference, the door panel 31L overcomes the traction of the rope 332L and the thrust caused by the pressure difference due to its own weight, and rotates to the right with the door hinge 35L as the axis. Correspondingly, the door panel 31R overcomes the traction of the rope 332R and the thrust caused by the pressure difference, and rotates to the left with the door hinge 35R as the axis. Therefore, the top ends of the door panels 31L and 31R collide, and the automatic reset damper 3 is closed, and the mine return air from the diffusion tower 5 passes through the ventilation space of the heat extraction platform 1 and is discharged through the return air heat exchanger 2.

[0033] The weight of the weight 333L is not particularly limited and can be adjusted. Preferably, the following configuration is adopted: the weight of the door panel 31L and the weight of the weight 333L are in a dynamic equilibrium state. When the pressure difference between the inside and outside of the heating platform 1 exceeds a predetermined pressure difference, the door panel 31L will open; when the pressure difference between the inside and outside of the heating platform 1 returns to below the predetermined pressure difference, the door panel 31L will close due to its own weight. When the two door panels 31L and 31R are closed, the top ends of the two door panels 31L and 31R are in a state of contact with each other, so as to avoid the situation where one of the door panels 31 drops too much and the two door panels 31 cannot be closed.

[0034] Alternatively, the pulley blocks 331L and 331R may be provided with motors, and when the pressure difference between the inside and outside of the heat extraction platform 1 reaches a threshold value, the control unit (not shown) controls the motors to rotate to control the two door panels 31L and 31R to rotate (open or close). By pre-designing to match the weight of the weights 333L and 333R with the weight of the door panels 31L and 31R, the motors can rotate with small torque, thereby saving energy.

[0035] (Stop)

[0036] The stoppers 32L and 32R are respectively arranged on both sides of the door panels 31L and 31R. One of the stoppers 32L is taken as an example for explanation. The other stopper 32R is designed to be symmetrical with the stopper 32L, which will not be described here. The stopper 32L is arranged on the outside of the door panel 31L, which is far away from the symmetry plane, and is arranged adjacent to the door panel 31L, and is arranged on the extension line of the top surface perpendicular to the center of the length direction of the door hinge 35L. However, the setting position of the stopper 32L is not limited to this. The stopper 32L can be arranged as follows: when the door panel 31L is opened, the stopper 32L limits the door panel 31L so that the angle between the door panel 31L and the top surface is less than 90°. As a result, the door panel 31L will not be over-opened due to the weight of the weight 333L. Therefore, it can be ensured that the door panel 31L can rotate due to its own weight when the automatic reset damper 3 is to be closed. Preferably, when the stopper 32L limits the door panel 31L, the angle between the door panel 31L and the top surface is greater than 80° and less than 90°.

[0037] The working principle of the automatic reset damper 3 is described in detail below.

[0038] like Figure 1 As shown, when the mine return air waste heat system is in operation, the return air discharged from the diffusion tower 4 passes through the ventilation space of the heat collection platform 1 and the return air heat exchanger 2, and the temperature is reduced and then discharged. The automatic reset damper 3 arranged on the top surface of the heat collection platform 1 is in a closed state. At this time, the pressure difference between the inside and outside of the heat collection platform 1 is less than or equal to the predetermined pressure difference, for example, 200Pa.

[0039] like Figure 2 As shown, when the mine return air waste heat system runs for a period of time, and the windward standard coal of the return air heat exchanger 2 gathers a certain amount of coal dust, the pressure difference between the inside and outside of the heat extraction platform 1 becomes larger and larger. When the pressure difference is greater than 200Pa, the two door panels 31L and 31R of the automatic reset damper 3 are pulled open by ropes 332L and 332R due to the weight of the weight hammer 333L and 333R and the thrust generated by the differential pressure. The return air discharged from the diffusion tower 4 is directly discharged through the ventilation space of the heat extraction platform 1 and the vent 34, so that the pressure inside the heat extraction platform 1 is rapidly reduced, ensuring that the mine ventilator system will not be affected by the increase of ventilation resistance and affect the safe operation.

[0040] After the automatic reset damper 3 is opened, the pressure inside the heat extraction platform 1 decreases, and the pressure difference between the inside and outside of the heat extraction platform 1 is less than 200Pa, and after the coal dust on the surface of the return air heat exchanger 2 is cleaned in time, the mine ventilation resistance returns to the initial resistance value of 100Pa, at which time the two door panels 31 of the automatic reset damper 3 drop and close due to their own weight. Therefore, by setting the automatic reset damper 3 as described above, the door panels 31 can be opened and closed automatically, thereby ensuring the safe operation of the ventilator.

[0041] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. An automatic reset damper, arranged on the top surface of a heat extraction platform for extracting waste heat from mine return air, covering the vents of the heat extraction platform, wherein the automatic reset damper is characterized in that it comprises: Two door panels, the two door panels are symmetrically arranged, the bottom ends of the two door panels are pivotally connected to the top surface via the vents in a rotatable manner by means of door hinges, and the top ends of the two door panels are in contact with each other in a closed state; Two pulley assemblies, the pulley assemblies comprising a pulley block, a rope, a weight and a supporting column, the two pulley assemblies are symmetrically arranged across the door panel and the vent, the pulley block is arranged at the top end of the supporting column, the rope is hung around the pulley block, one end of the rope is connected to the door panel, and the other end is hung with the weight; as well as Two limiters are symmetrically arranged across the door panel and the vent and are arranged adjacent to the door panel. When the two door panels are opened, the two limiters respectively limit the opening positions of the two door panels. When the two door panels are in an open state, mine return air can be discharged through the vents.

2. The automatic reset damper according to claim 1, characterized in that: When the pressure difference between the inside and outside of the heat extraction platform exceeds a predetermined pressure, the two door panels open. When the pressure difference between the inside and the outside of the heat extraction platform is below the predetermined pressure, the two door panels are closed.

3. The automatic reset damper according to claim 1, characterized in that: When the two door panels are in a closed state, the angle formed by the top ends of the two door panels is 90°.

4. The automatic reset damper according to claim 1, characterized in that: When the door panel is opened, the limiter limits the opening position of the door panel.

5. The automatic reset damper according to claim 4, characterized in that: When the door panel is in an open state, the limiter makes the included angle between the inner side surface of the door panel and the top surface be greater than 80° and less than 90°.

6. The automatic reset damper according to claim 1, characterized in that: The connection point between the rope and the door panel is arranged at the center point or the center of gravity of the door panel.

7. The automatic reset damper according to claim 1, characterized in that: The weight of the heavy hammer can be adjusted so that the door panel and the heavy hammer are in a dynamic balance state.

8. The automatic reset damper according to claim 1, characterized in that: The stopper is arranged on an extension line of the top surface which is perpendicular to the center of the length direction of the door hinge.

9. The automatic reset damper according to claim 1, characterized in that: The support column is arranged on an extension line of the top surface which is perpendicular to the center of the length direction of the door hinge.

10. The automatic reset damper according to claim 9, characterized in that: The pulley block comprises two fixed pulleys, and the two fixed pulleys are respectively arranged on both sides of the top end of the supporting column in a horizontal manner with respect to the extension line.

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