Rigid negative pressure air duct

Abstract

The utility model discloses a rigid negative pressure air duct which comprises two sets of negative pressure air ducts, reinforcing steel rings are fixedly installed in the negative pressure air ducts, a butt joint structure is connected between the negative pressure air ducts, and the butt joint structure comprises a first fixing ring, a second fixing ring, an inserting ring and a rubber ring. A first clamping assembly is connected between the outer wall of the first fixing ring and the outer wall of the second fixing ring and comprises a first concave base, a second concave base, a connecting arm, a connecting shaft, a second clamping assembly and a clamping hole. According to the rigid negative pressure air duct, through the arranged butt joint structure, the connection sealing performance can be conveniently improved, and through the arranged first clamping assembly, the first fixing ring and the second fixing ring in the butt joint structure can be conveniently assembled and disassembled.

Description

Technical Field

[0001] This utility model relates to the field of mining equipment technology, specifically a rigid negative pressure ventilation duct. Background Technology

[0002] In underground engineering operations such as coal mines and tunnels, negative pressure ventilation ducts are an important type of ventilation equipment used to guide and transport airflow, ensure air circulation in the working environment, reduce methane concentration, and remove dust. Traditional negative pressure ventilation ducts have reinforcing steel rings inside to maintain the rigidity of the duct structure.

[0003] However, in practical applications, multi-section negative pressure ventilation ducts need to be connected to meet ventilation requirements of different lengths.

[0004] Currently, the main method for connecting negative pressure ventilation ducts is by binding with steel wire. While this method is simple, it has the following problems:

[0005] 1. The binding process is time-consuming and labor-intensive, especially inconvenient to operate in the narrow space underground;

[0006] 2. The sealing of the connection points after binding is poor, which can easily lead to air leakage and affect ventilation efficiency.

[0007] Therefore, we propose a rigid negative pressure ventilation duct. Utility Model Content

[0008] (a) Technical problems to be solved

[0009] To address the shortcomings of existing technologies, this utility model provides a rigid negative pressure ventilation duct, which facilitates improved sealing of connections between negative pressure ventilation ducts and offers advantages such as easy assembly and disassembly, effectively solving the problems in the background technology.

[0010] (II) Technical Solution

[0011] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a rigid negative pressure duct, comprising two sets of negative pressure ducts, wherein a reinforcing steel ring is fixedly installed in each negative pressure duct, and a docking structure is connected between the negative pressure ducts. The docking structure includes a first fixing ring, a second fixing ring, a plug-in ring, and a rubber ring. A first snap-fit ​​assembly is connected between the outer walls of the first fixing ring and the second fixing ring. The first snap-fit ​​assembly includes a first concave seat, a second concave seat, a connecting arm, a connecting shaft, a second snap-fit ​​assembly, and a snap-fit ​​hole. In each set of the first snap-fit ​​assembly, there are two sets of the connecting shaft and two sets of the second snap-fit ​​assembly. The two sets of the second snap-fit ​​assembly are installed at one end of the outer surface on both sides of the connecting arm. The second snap-fit ​​assembly includes a mounting hole, a helical spring, and a snap-fit ​​pin. The first concave seat is fixed to the outer wall of the first fixing ring, and the second concave seat is fixed to the outer wall of the second fixing ring.

[0012] Preferably, the two sets of connecting shafts are fixed on the outer surfaces of the connecting arm at the ends away from the second snap-fit ​​assembly. The connecting shafts are connected to the first concave seat, and a sealed bearing is provided between the connecting shafts and the first concave seat. The connecting shafts are rotatably connected to the first concave seat through the sealed bearing.

[0013] Preferably, the mounting hole is located on the outer surface of both sides of the connecting arm at the end away from the connecting shaft. The helical spring is located in the mounting hole, one end of the helical spring is fixedly connected to the mounting hole, and the outer surface of the other end of the helical spring is fixedly connected to the outer surface of one end of the snap-fit ​​pin.

[0014] Preferably, the outer wall of the locking pin is slidably connected to the mounting hole, and one end of the outer surface of the locking pin is elastically connected to one end of the mounting hole by a helical spring.

[0015] Preferably, the snap-fit ​​hole is located on the upper part of the outer surface of both sides of the second concave seat, and the outer wall of one end of the snap-fit ​​pin is inserted into the snap-fit ​​hole.

[0016] Preferably, the second fixing ring is fixed to the outer wall of one end of the insertion ring, the rubber ring is sleeved on the side of the outer wall of the insertion ring near the second fixing ring, and the end of the insertion ring away from the second fixing ring is inserted into the first fixing ring.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, this utility model provides a rigid negative pressure ventilation duct, which has the following beneficial effects:

[0019] 1. This rigid negative pressure duct, through its designed docking structure, facilitates improved sealing of the connection.

[0020] 2. The rigid negative pressure duct is provided with a first snap-fit ​​component, which makes it easy to assemble and disassemble the first fixing ring and the second fixing ring in the docking structure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a rigid negative pressure ventilation duct according to the present invention.

[0022] Figure 2 This is a schematic diagram of the docking structure in a rigid negative pressure ventilation duct according to the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of the first snap-fit ​​component in a rigid negative pressure ventilation duct according to the present invention.

[0024] Figure 4 This is a partial schematic diagram of the first snap-fit ​​component in a rigid negative pressure ventilation duct according to the present invention.

[0025] Figure 5 This utility model relates to a rigid negative pressure ventilation duct. Figure 4 Top view of the cross section.

[0026] In the diagram: 1. Negative pressure ventilation duct; 2. Reinforcing steel ring; 3. Butt joint structure; 4. First snap-fit ​​assembly; 5. First fixing ring; 6. Second fixing ring; 7. Insertion ring; 8. Rubber ring; 9. First concave seat; 10. Second concave seat; 11. Connecting arm; 12. Connecting shaft; 13. Second snap-fit ​​assembly; 14. Snap-fit ​​hole; 15. Mounting hole; 16. Helical spring; 17. Snap-fit ​​pin. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0028] This embodiment is a rigid negative pressure ventilation duct.

[0029] like Figure 1-4 As shown, it includes a negative pressure duct 1, and there are two sets of negative pressure ducts 1. A reinforcing steel ring 2 is fixedly installed in the negative pressure duct 1. A docking structure 3 is connected between the negative pressure ducts 1. The docking structure 3 includes a first fixing ring 5, a second fixing ring 6, a plug ring 7 and a rubber ring 8. A first snap-fit ​​assembly 4 is connected between the outer walls of the first fixing ring 5 and the second fixing ring 6. The first snap-fit ​​assembly 4 includes a first concave seat 9, a second concave seat 10, a connecting arm 11, a connecting shaft 12, a second snap-fit ​​assembly 13 and a snap-fit ​​hole 14. There are two sets of connecting shaft 12 and two sets of second snap-fit ​​assemblies 13 in each set of first snap-fit ​​assemblies 4. The two sets of second snap-fit ​​assemblies 13 are installed at one end of the outer surface of both sides of the connecting arm 11. The second snap-fit ​​assembly 13 includes a mounting hole 15, a coil spring 16 and a snap-fit ​​pin 17. The first concave seat 9 is fixed to the outer wall of the first fixing ring 5 and the second concave seat 10 is fixed to the outer wall of the second fixing ring 6.

[0030] Two sets of connecting shafts 12 are fixed to the outer surfaces of both sides of the connecting arm 11 at the ends away from the second snap-fit ​​assembly 13. The connecting shafts 12 are connected to the first concave seat 9, and a sealed bearing is provided between the connecting shafts 12 and the first concave seat 9. The connecting shafts 12 are rotatably connected to the first concave seat 9 through the sealed bearing. Mounting holes 15 are opened at the ends of both sides of the connecting arm 11 away from the connecting shafts 12. A helical spring 16 is located in the mounting hole 15. One end of the helical spring 16 is fixedly connected to the mounting hole 15, and the outer surface of the other end of the helical spring 16 is connected to one end of the snap-fit ​​pin 17. The outer surface is fixedly connected; the outer wall of the snap-fit ​​pin 17 is slidably connected to the mounting hole 15, and one end of the outer surface of the snap-fit ​​pin 17 is elastically connected to one end of the mounting hole 15 through a helical spring 16; the snap-fit ​​hole 14 is opened on the upper part of the outer surface on both sides of the second concave seat 10, and the outer wall of one end of the snap-fit ​​pin 17 is inserted into the snap-fit ​​hole 14; the second fixing ring 6 is fixed to the outer wall of one end of the insertion ring 7, and the rubber ring 8 is sleeved on the side of the outer wall of the insertion ring 7 close to the second fixing ring 6, and the end of the insertion ring 7 away from the second fixing ring 6 is inserted into the first fixing ring 5.

[0031] It should be noted that this utility model is a rigid negative pressure ventilation duct. The negative pressure ventilation duct 1 and the reinforcing steel ring 2 described in this article are both existing technologies and can be effectively known to those skilled in the art. Specific details will not be elaborated further. The first fixing ring 5 is fixed to one end of a set of negative pressure ventilation ducts 1, and the second fixing ring 6 is fixed to one end of another set of negative pressure ventilation ducts 1. During connection, the first fixing ring 5 and the second fixing ring 6 are mated, and one end of the insertion ring 7 is inserted into the interior of the first fixing ring 5. The first fixing ring 5 compresses the rubber ring 8 on one side of the second fixing ring 6, and then the connection is made through the first snap-fit ​​component 4. When connecting and fixing, the locking pins 17 at one end of both sides of the connecting arm 11 are squeezed. The locking pins 17 squeeze the coil spring 16 along the mounting hole 15, so that one end of the locking pin 17 enters the mounting hole 15. Then, the connecting arm 11 is flipped. When one end of the second locking component 13 reaches the locking hole 14, the reaction force of the coil spring 16 drives one end of the locking pin 17 to lock into the locking hole 14, realizing the connection between the first fixing ring 5 and the second fixing ring 6, and facilitating disassembly. When disassembling, the locking pins 17 locked in the locking hole 14 are squeezed, so that the locking pins 17 and the locking hole 14 are locked together.

[0032] It should be noted that, in this document, relational terms such as first and second (number one, number two), etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A rigid negative pressure ventilation duct, comprising a negative pressure ventilation duct (1), wherein the number of negative pressure ventilation ducts (1) is two sets, and a reinforcing steel ring (2) is fixedly installed in the negative pressure ventilation duct (1), characterized in that: The negative pressure air ducts (1) are connected by a docking structure (3). The docking structure (3) includes a first fixing ring (5), a second fixing ring (6), a plug ring (7), and a rubber ring (8). A first snap-fit ​​assembly (4) is connected between the outer walls of the first fixing ring (5) and the second fixing ring (6). The first snap-fit ​​assembly (4) includes a first concave seat (9), a second concave seat (10), a connecting arm (11), a connecting shaft (12), a second snap-fit ​​assembly (13), and a snap-fit ​​hole (14). The number of the connecting shaft (12) and the second snap-fit ​​assembly (13) in a set of the first snap-fit ​​assembly (4) are two sets. The two sets of the second snap-fit ​​assembly (13) are installed on one end of the outer surface of both sides of the connecting arm (11). The second snap-fit ​​assembly (13) includes a mounting hole (15), a spiral spring (16), and a snap-fit ​​pin (17). The first concave seat (9) is fixed to the outer wall of the first fixing ring (5), and the second concave seat (10) is fixed to the outer wall of the second fixing ring (6).

2. The rigid negative pressure ventilation duct according to claim 1, characterized in that: The two sets of connecting shafts (12) are fixed on the outer surfaces of the connecting arm (11) at one end away from the second snap-fit ​​assembly (13). The connecting shafts (12) are connected to the first concave seat (9). A sealed bearing is provided between the connecting shafts (12) and the first concave seat (9). The connecting shafts (12) are rotatably connected to the first concave seat (9) through the sealed bearing.

3. A rigid negative pressure ventilation duct according to claim 2, characterized in that: The mounting hole (15) is opened on the outer surface of both sides of the connecting arm (11) away from the connecting shaft (12). The helical spring (16) is located in the mounting hole (15). One end of the helical spring (16) is fixedly connected to the mounting hole (15), and the outer surface of the other end of the helical spring (16) is fixedly connected to the outer surface of one end of the snap pin (17).

4. A rigid negative pressure ventilation duct according to claim 3, characterized in that: The outer wall of the snap-fit ​​pin (17) is slidably connected to the mounting hole (15), and one end of the outer surface of the snap-fit ​​pin (17) is elastically connected to one end of the mounting hole (15) through a helical spring (16).

5. A rigid negative pressure ventilation duct according to claim 4, characterized in that: The snap-fit ​​hole (14) is located on the upper part of the outer surface of both sides of the second concave seat (10), and the outer wall of one end of the snap-fit ​​pin (17) is inserted into the snap-fit ​​hole (14).

6. A rigid negative pressure ventilation duct according to claim 5, characterized in that: The second fixing ring (6) is fixed to the outer wall of one end of the plug ring (7), and the rubber ring (8) is sleeved on the side of the outer wall of the plug ring (7) close to the second fixing ring (6). The end of the plug ring (7) away from the second fixing ring (6) is plugged into the first fixing ring (5).

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