Adjustable dampers used for performance testing of main ventilation fans in underground coal mines

Abstract

This utility model relates to the field of ventilation and dust control technology in underground mines, specifically to an adjustable damper for testing the performance of main ventilation fans in coal mines. It primarily addresses the technical problems of low safety, low testing efficiency, and high material costs in existing main ventilation fan performance testing methods. The adjustable damper includes: a door frame, the frame surface of which is perpendicular to the length of the roadway, and the door frame has multiple mounting openings distributed along the width of the roadway; multiple door panels, each corresponding to a mounting opening, which are mounted in the corresponding mounting opening via hinges; a drive unit, mounted on the door frame and connected to the corresponding door panel; and a control box, connected to all drive units to control the independent operation of each drive unit. When using this adjustable damper to test the performance of main ventilation fans, the operator only needs to operate the control box, resulting in high safety and testing efficiency. Furthermore, this adjustable damper can be reused repeatedly without annual replacement, and the material cost is also low.

Description

Technical Field

[0001] This utility model relates to the field of ventilation, fire prevention, and gas control technology in underground mines, and in particular to an adjustable damper for measuring the performance of main ventilation fans in coal mines. Background Technology

[0002] "Ventilation and Dust Control" is a core concept in coal mine safety production. Ventilation refers to mine ventilation, while dust control refers to prevention of methane, coal dust, and fire. Mine ventilation's core functions are supplying fresh air, removing harmful substances, and regulating environmental parameters; it forms the foundation of the dust control system. The main ventilation fan is the core component of the mine ventilation system, primarily providing continuous power and determining its operational efficiency. According to relevant regulations, performance testing of the main ventilation fans in high-gas mines should be conducted at least annually. One of the core tasks of this performance testing is to determine operating points under different air resistance conditions and ultimately plot a complete fan performance curve.

[0003] In existing technologies, wooden boards are typically installed manually on both sides of the bottom of the return air shaft to simulate different wind resistances and thus complete the test. However, due to the influence of wind pressure at the bottom of the shaft, there are certain safety risks in the process of manually installing / removing the wooden boards, and the manual addition / removal of the boards is time-consuming, affecting the efficiency of performance testing; at the same time, the wooden boards used for the performance testing of the main ventilation fan must be completely replaced every year, resulting in high material costs.

[0004] Therefore, there is an urgent need for a major ventilator performance testing technology that is highly safe, efficient, and cost-effective. Utility Model Content

[0005] To overcome the technical shortcomings of existing main ventilation fan performance testing, such as low safety, low testing efficiency, and high material costs, this utility model provides an adjustable damper for measuring the performance of main ventilation fans in underground coal mines.

[0006] The adjustable damper for measuring the performance of main ventilation fans in underground coal mines provided by this utility model includes:

[0007] A door frame for installation in a tunnel and for connection and fixation to the inner wall of the tunnel, wherein the frame surface of the door frame is perpendicular to the length direction of the tunnel and the door frame is provided with multiple installation openings distributed along the width direction of the tunnel.

[0008] The door leaf has multiple panels, each corresponding to a mounting opening. The door leaf is installed in the corresponding mounting opening via a vertically arranged hinge shaft.

[0009] A driving component is provided, which is provided in multiple parts and corresponds one to one of the door leaves. The driving component is installed on the door frame and connected to the corresponding door leaf. The driving component drives the door leaf to rotate so that the door leaf has a closed state that blocks the installation opening and an open state that forms a ventilation opening with the installation opening.

[0010] The control box is connected to all the drive components to control the independent operation of each drive component.

[0011] Optionally, the hinge axis is located at the middle of the width direction of the door leaf.

[0012] Optionally, the driving component is a cylinder. The cylinder body is fixed on the door frame and arranged along the width direction of the door frame. The piston rod of the cylinder is connected to the door leaf through a connecting rod. Both ends of the connecting rod are hinged, and the end of the connecting rod connected to the door leaf is offset from the hinge axis. When the cylinder drives the door leaf to rotate to the open state, the door leaf is perpendicular to the frame surface of the door frame.

[0013] Optionally, it also includes a pneumatic louver, which is installed in the area between the door frame and the inner wall of the tunnel and located above the door frame, and the pneumatic louver is connected to the control box.

[0014] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0015] This utility model provides an adjustable damper for testing the performance of main ventilation fans in underground coal mines. A control box controls the independent operation of each drive component, which in turn moves the corresponding door leaf between closed and open states. All door leaves work together to simulate different levels of wind resistance, thus completing the test. When using this adjustable damper to test the performance of main ventilation fans, the operator only needs to operate the control box. The linkage between the control box and the drive components allows for rapid movement of each door leaf, resulting in high safety and testing efficiency. Furthermore, this adjustable damper can be reused repeatedly, eliminating the need for annual replacement and reducing material costs. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a schematic diagram of the adjustable damper in an embodiment of the present invention;

[0019] Figure 2 express Figure 1 A magnified view of a section at point A in the middle;

[0020] Figure 3 A top-view diagram showing the door in the closed state in an embodiment of this utility model;

[0021] Figure 4 This is a top-view diagram showing the door in the open state in an embodiment of this utility model.

[0022] In the picture:

[0023] 1. Door frame; 2. Door leaf; 21. Hinge shaft; 22. Connecting seat; 23. Connecting shaft; 3. Drive component; 31. Link rod; 4. Louver; 100. Wall. Detailed Implementation

[0024] To better understand the above-mentioned objectives, features, and advantages of this utility model, the solution of this utility model will be further described below. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features thereof can be combined with each other.

[0025] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present invention, and not all embodiments.

[0027] The following is combined Figures 1 to 4 The specific embodiments of this utility model will be described in detail below.

[0028] This embodiment provides an adjustable damper for measuring the performance of main ventilation fans in underground coal mines, including a door frame 1, a door leaf 2, a drive component 3, and a control box.

[0029] The door frame 1 is used to be installed in the tunnel and connected and fixed to the inner wall of the tunnel. The frame surface of the door frame 1 is perpendicular to the length direction of the tunnel, and the door frame 1 is provided with multiple installation openings distributed along the width direction of the tunnel.

[0030] Specifically, a wall 100 can be built at the location where the door frame 1 needs to be installed in the alley. The wall 100 has a reserved installation position that matches the door frame 1. Then the door frame 1 can be installed in the installation position. The structure has strong stability, and since the door frame 1 and the alley are blocked by the wall 100, it can provide greater wind resistance.

[0031] Specifically, the number of installation ports is not limited, for example Figure 1 The installation ports shown have four.

[0032] Specifically, the shape of the mounting opening is not limited, but it must ensure that the door leaf 2 installed inside can rotate around the vertically arranged hinge axis 21, for example... Figure 1 The mounting port shown is designed to be rectangular.

[0033] The door leaf 2 has multiple panels, each corresponding to a mounting opening. The door leaf 2 is installed in the corresponding mounting opening via vertically arranged hinge shafts 21.

[0034] Specifically, the hinge shaft 21 is located in the middle of the width direction of the door leaf 2. Hinges 21 are fixed to both the top and bottom of the door leaf 2, and both hinge shafts 21 are rotatably mounted inside the door frame 1 via bearings to ensure smooth rotation of the door leaf 2. Alternatively, the hinge shaft 21 can be fixed to the door frame 1 and rotatably connected to the door leaf 2.

[0035] Among them, there are multiple driving components 3, each corresponding to a door leaf 2. The driving components 3 are installed on the door frame 1 and connected to the corresponding door leaf 2. The driving components 3 drive the door leaf 2 to rotate so that the door leaf 2 has a closed state that blocks the installation opening and an open state that forms a ventilation opening with the installation opening.

[0036] Specifically, the driving component 3 is a cylinder. The cylinder body is fixed to the door frame 1 and arranged along the width direction of the door frame 1. The piston rod of the cylinder is connected to the door leaf 2 through a connecting rod 31. Both ends of the connecting rod 31 are hinged, and the end of the connecting rod 31 connected to the door leaf 2 is offset from the hinge shaft 21. When the cylinder drives the door leaf 2 to rotate to the open state, the door leaf 2 is perpendicular to the frame surface of the door frame 1. The driving component 3 is a cylinder mainly for safety considerations, because there is gas in the mine, and using a driving component 3 such as an electric push rod would pose a significant safety hazard. During operation, the piston rod of the cylinder extends and retracts, driving the connecting rod 31 to move, thereby driving the door leaf 2 to rotate around the hinge shaft 21. By designing the stroke of the cylinder and the length of the connecting rod 31, the two extreme stroke positions of the cylinder can be made to correspond exactly to the open and closed states of the door leaf 2.

[0037] More specifically, a connecting seat 22 is fixed on one side of the hinge shaft 21 on the door leaf 2, and a connecting shaft 23 extends upward from the connecting seat 22. The top of the connecting shaft 23 is higher than the door leaf 2 and is hinged to the connecting rod 31, thus realizing the linkage between the cylinder and the door leaf 2.

[0038] It should be noted that this adjustable damper mainly achieves wind resistance adjustment through the cooperation of multiple door panels 2. Each door panel 2 has an open state and a closed state, which is sufficient to meet the test requirements. There is no need to control the door panel 2 to stay in an intermediate state between the open state and the closed state. Therefore, it is entirely feasible to use a cylinder as the driving component 3.

[0039] Furthermore, a sealing strip can be installed on the inner edge of the door frame 1 to ensure the sealing between the door leaf 2 and the door frame 1 when the door leaf 2 is in the closed state, thereby improving the control accuracy of wind resistance.

[0040] The control box is connected to all drive components 3 to control the independent operation of each drive component 3.

[0041] It is easy to understand that the control box should be equipped with a control panel, and the control panel should be equipped with buttons to control the corresponding drive unit 3 to start or stop. The circuit involved is a conventional design in this field and will not be described in detail here.

[0042] Furthermore, the adjustable damper in this embodiment also includes a pneumatic louver 4, which is installed in the area between the door frame 1 and the inner wall of the tunnel and located above the door frame 1. The pneumatic louver 4 is connected to the control box. The door leaf 2, in conjunction with the pneumatic louver 4, can simulate a wider range of wind resistances to meet the wind resistance requirements of some special tests.

[0043] It should be noted that the pneumatic louver 4 is a mature structure in this field. It also uses a cylinder to drive all the blades of the louver 4 to open or close simultaneously, as described in patents such as CN218439142U and CN207106794U.

[0044] The working principle of the adjustable damper used for performance testing of main ventilation fans in underground coal mines in this embodiment is as follows:

[0045] During use, the operator can adaptively open door 2 and / or louvers 4 through the control box according to the test wind resistance requirements. For example, when a lower wind resistance is required, louvers 4 and all door 2 can be opened at the same time; when a higher wind resistance is required, one door 2 can be opened while the remaining door 2 and louvers 4 are closed. By measuring the operating points under different wind resistance conditions, a complete fan performance curve can be finally plotted.

[0046] The above are merely specific embodiments of this utility model, enabling those skilled in the art to understand or implement this utility model. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. An adjustable damper for use in the performance determination of a main fan in a coal mine, characterised in that, include: A door frame (1) is used to be installed in the tunnel and connected and fixed to the inner wall of the tunnel. The frame surface of the door frame (1) is perpendicular to the length direction of the tunnel, and the door frame (1) is provided with a plurality of installation openings distributed along the width direction of the tunnel. Door leaf (2), which has multiple and corresponds one-to-one with the mounting opening, the door leaf (2) is installed in the corresponding mounting opening through a vertically arranged hinge shaft (21); A drive unit (3) is provided in multiple parts and corresponds one-to-one with the door leaf (2). The drive unit (3) is installed on the door frame (1) and connected to the corresponding door leaf (2). The drive unit (3) drives the door leaf (2) to rotate so that the door leaf (2) has a closed state that blocks the installation opening and an open state that forms a ventilation opening with the installation opening. The control box is connected to all the drive components (3) to control the independent operation of each drive component (3).

2. An adjustable damper for primary fan performance testing in a coal mine, according to claim 1, characterised in that, The hinge shaft (21) is located in the middle of the width direction of the door leaf (2).

3. An adjustable damper for primary fan performance testing in a coal mine, according to claim 2, wherein, The driving component (3) is a cylinder. The cylinder body is fixed on the door frame (1) and arranged along the width direction of the door frame (1). The piston rod of the cylinder is connected to the door leaf (2) through a connecting rod (31). Both ends of the connecting rod (31) are hinged. The end of the connecting rod (31) connected to the door leaf (2) is misaligned with the hinge shaft (21). When the cylinder drives the door leaf (2) to rotate to the open state, the door leaf (2) is perpendicular to the frame surface of the door frame (1).

4. The adjustable damper for measuring the performance of main ventilation fans in underground coal mines according to any one of claims 1 to 3, characterized in that, It also includes a pneumatic louver (4), which is installed in the area between the door frame (1) and the inner wall of the tunnel and is located above the door frame (1). The pneumatic louver (4) is connected to the control box.

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