Untwisting pipe and untwisting device

Abstract

The utility model discloses an untwisting pipe and an untwisting device, and relates to the technical field of textile equipment. A first central channel and a second central channel which are sequentially communicated are arranged in the pipe body, and the inner diameter of the second central channel is smaller than that of a gas inlet of the gas inlet cavity of the base; one end of the first central channel is a wire outlet; the other end of the second central channel is closed; the side wall of the pipe body is provided with at least one lateral air inlet used for forming spiral airflow, the lateral air inlets are communicated with the second central channel, and one end, provided with each lateral air inlet, of the pipe body can be arranged in the air inlet cavity; a yarn inlet communicated with the first center channel is formed in the side wall of the pipe body, high-speed airflow flowing through the first center channel can form negative pressure at the yarn inlet and suck in yarn, and the rotating direction of the high-speed airflow located in the first center channel is opposite to the twisting direction of the yarn. Stable and reliable untwisting airflow is provided, the yarn untwisting effect is improved, the airflow path is short, gas loss is small, the structure is simple, and installation is convenient and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of textile equipment, in particular to an untwisting tube and an untwisting device. Background Art

[0002] Winding machine is a special equipment for textile industry, which plays a "bridge" role in the textile field. Its main working principle includes the steps of drawing, yarn formation, strand formation and warping. Through the winding machine, the fiber can be processed into fine yarn, and further woven into various textiles.

[0003] Untwisting is an important part of the winding machine operation. The existing untwisting tube technology is monopolized by Europe and Japan. The conventional structure of the existing untwisting tube 30 is as follows: Figure 4 and Figure 5 As shown, the principle is that a high-speed airflow enters through the air inlet cavity 311 on the connecting base 31 and enters from the side air inlet 301 of the existing untwisting tube 30 through the guide channel 312 for changing the direction of the airflow. After entering the existing untwisting tube 30, the high-speed airflow is blown out toward one end thereof, and negative pressure is formed at the opening at the other end of the untwisting tube, thereby sucking the yarn end into it.

[0004] However, in general, after the high-speed airflow enters from the side air inlet 301 of the existing untwisting tube 30, it will blow toward the inner wall thereof, and form two counter-rotating airflows inside the existing untwisting tube 30, such as Figure 5 As shown, the rotating airflow in the same twist direction as the yarn is not conducive to the untwisting of the yarn, which ultimately leads to poor untwisting effect of the yarn; and the high-speed airflow needs to pass through a structural component with a guide channel 312 in the air inlet cavity 311 on the connecting base 31 before it can be connected with its side air inlet 301, the airflow path is large, and the gas loss is large. Utility Model Content

[0005] The purpose of the utility model is to provide an untwisting tube and an untwisting device to solve the problems existing in the above-mentioned prior art, to provide a stable and reliable untwisting airflow, to improve the yarn untwisting effect, and to have a short airflow path, less gas loss, a simple structure, and convenient and reliable installation.

[0006] To achieve the above purpose, the utility model provides the following solutions:

[0007] The utility model provides an untwisting tube, comprising a tube body; the tube body is provided with a first central channel and a second central channel, the inner diameter of the second central channel is smaller than the inner diameter of the gas inlet of the air inlet cavity of the base, and the inner diameter of the second central channel is smaller than the inner diameter of the first central channel; one end of the first central channel is opened as a wire outlet, and the other end of the first central channel is connected and communicated with one end of the second central channel; the second central channel is closed at one end away from the first central channel; at least one lateral air inlet is provided on the side wall of the tube body, the lateral air inlet is communicated with the second central channel and the lateral air inlet can guide the airflow to enter the second central channel in a rotating shape and flow toward the first central channel, and one end of the tube body with each of the lateral air inlets can be placed in the air inlet cavity of the base; a wire inlet connected with the first central channel is provided on the side wall of the tube body located outside the air inlet cavity of the base, and the high-speed airflow flowing through the first central channel can form a negative pressure at the wire inlet and suck the yarn, and the rotation direction of the high-speed airflow in the first central channel is opposite to the twist direction of the yarn.

[0008] Preferably, the number of the lateral air inlets is 2, and the high-speed airflow has the same rotation direction in the second central channel after entering the second central channel through each of the lateral air inlets.

[0009] Preferably, the first central channel and the second central channel are coaxially arranged.

[0010] Preferably, the line inlet is an inclined opening with its end facing the line outlet.

[0011] The utility model also provides an untwisting device, comprising a base and an untwisting tube as described in any one of the above items, wherein the base is provided with an air inlet cavity, a gas inlet and a gas outlet, the gas inlet and the gas outlet are both connected to the air inlet cavity, and the gas inlet is used to introduce compressed gas; one end of the tube body having each of the lateral air inlets is sealed and fixed at the gas outlet, and one end of the tube body having each of the lateral air inlets is located in the air inlet cavity and has a gap with each inner wall of the air inlet cavity.

[0012] Preferably, a guide groove is provided on the base at a position corresponding to the wire inlet of the untwisting tube, and one end of the guide groove close to the wire inlet is in a contracted state and can guide the yarn to enter the wire inlet.

[0013] Preferably, the untwisting tube is detachably sealed and fixed at the gas outlet.

[0014] Preferably, a first limiting surface is provided at the gas outlet, and a second limiting surface is provided on the tube body; when the end of the tube body having the lateral air inlet is located in the air inlet cavity, the first limiting surface and the second limiting surface are in contact with and limit the end of the tube body having the lateral air inlet from continuing to move into the air inlet cavity.

[0015] Compared with the prior art, the utility model has achieved the following technical effects:

[0016] The utility model provides an untwisting tube, by adopting a lateral air inlet that can be directly placed inside the air inlet cavity of the base, the airflow in the air inlet cavity of the base can directly pass through the lateral air inlet to rotate the airflow into the second central channel and flow into the first central channel. This arrangement makes the airflow flow path shorter than the existing structure and reduces the gas loss; an airflow with a fixed rotation direction is introduced into the lateral air inlet at the bottom of the second central channel to provide a fixed rotation direction and stable and reliable untwisting airflow for the first central channel; the inner diameter of the second central channel is smaller than the inner diameter of the gas inlet of the air inlet cavity of the base and the inner diameter of the first central channel. A Venturi tube structure design with a central channel inner diameter is matched with a wire inlet, so that the end of the yarn is sucked in from the wire inlet through the negative pressure formed by the high-speed rotating airflow at the wire inlet, and the upward airflow of the high-speed rotating airflow is used to impact the tail end of the yarn and pull the internal limit of the yarn to untwist. The yarn inlet position is located on the path of the high-speed rotating airflow, so that the untwisting effect starts when the yarn is sucked in, thereby improving the yarn untwisting effect. The overall structure is simple and the processing is convenient. During installation, only the end of the tube body with the lateral air inlet needs to be inserted into the air inlet cavity of the base for sealing. The installation is simple and convenient.

[0017] Furthermore, two lateral air inlets with the same rotation direction are used to provide more stable and reliable high-speed rotating airflow through two air flows.

[0018] Furthermore, the first central channel and the second central channel are coaxially arranged so that the high-speed airflow in the second central channel can flow through the first central channel more evenly and stably, thereby improving the untwisting effect on the yarn in the first central channel.

[0019] Furthermore, the wire inlet adopts a structure of an inclined opening with the end facing the wire outlet, so that the yarn can move toward the wire outlet more smoothly after entering the first central channel.

[0020] The utility model also provides an untwisting device, which adopts an air inlet cavity arranged in a base to provide more stable and reliable compressed gas. When in use, the untwisting tube only needs to be inserted and fixed at the gas outlet. It is easy to disassemble and assemble, and daily maintenance is also more convenient and reliable. The base and the untwisting tube are combined to provide a stable and reliable untwisting airflow, thereby improving the yarn untwisting effect. The airflow path is short, the gas loss is small, and the structure is simple.

[0021] Furthermore, the provision of the guide groove on the base can facilitate the guiding of the yarn to enter the wire inlet more smoothly, thereby improving work efficiency.

[0022] Furthermore, the untwisting tube is detachably arranged at the gas outlet, which can facilitate the disassembly and assembly of the untwisting tube and facilitate daily maintenance.

[0023] Furthermore, the setting of the first limiting surface and the second limiting surface can serve as an insertion limit for the untwisting tube at the gas outlet, thereby ensuring that the untwisting tube is installed in place and avoiding excessive insertion of the untwisting tube, which causes the bottom of the untwisting tube to fit against the bottom surface of the air inlet cavity, thereby limiting the flow of air in the air inlet cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the overall structure of the untwisting tube provided by the utility model;

[0026] Figure 2 This is a schematic diagram of the overall structure of the untwisting device provided by the utility model;

[0027] Figure 3 An exploded diagram of the structure of the untwisting device provided by the utility model;

[0028] Figure 4 It is a structural schematic diagram of an existing untwisting tube;

[0029] Figure 5 It is a schematic diagram of the airflow in the cross section of the existing untwisting tube;

[0030] Figure 6 A schematic diagram of air flow in the untwisting device provided by the utility model;

[0031] Figure 7 A schematic diagram of the positions of the lateral air inlet and the wire inlet on the untwisting tube provided by the utility model;

[0032] Figure 8 The utility model provides a schematic diagram of the flow of air in the air inlet cavity of the base entering the untwisting tube.

[0033] In the figure:

[0034] 100-untwisting device;

[0035] 1-tube body; 11-first central channel; 12-second central channel; 13-lateral air inlet; 14-line inlet; 15-line outlet; 16-second limiting surface;

[0036] 2-base; 21-gas inlet; 22-gas inlet cavity; 23-gas outlet; 231-first limiting surface; 24-guide groove.

[0037] 30-existing untwisting tube; 301-side air inlet; 31-connecting base; 311-air inlet cavity; 312-guide channel. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] The utility model aims to provide an untwisting tube and an untwisting device to solve the problems existing in the prior art, and can provide a stable and reliable untwisting airflow to improve the yarn untwisting effect, and has a short airflow path, less gas loss, a simple structure, and convenient and reliable installation.

[0040] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0041] Embodiment 1

[0042] This embodiment provides a detwisting tube, such as Figure 1 to Figure 3 and Figure 6 to Figure 8As shown, it includes a tube body 1; the tube body 1 has a first central channel 11 and a second central channel 12, the inner diameter of the second central channel 12 is smaller than the inner diameter of the gas inlet 21 of the air inlet cavity 22 of the base 2, and the inner diameter of the second central channel 12 is smaller than the inner diameter of the first central channel 11; one end of the first central channel 11 is opened as an outlet 15, and the other end of the first central channel 11 is connected and communicated with one end of the second central channel 12; the end of the second central channel 12 away from the first central channel 11 is closed; at least one lateral air inlet 13 is opened on the side wall of the tube body 1, and the lateral air inlet The opening 13 is connected with the second central channel 12 and the lateral air inlet 13 can guide the airflow to enter the second central channel 12 in a rotating shape and flow toward the first central channel 11, and one end of the tube body 1 with each lateral air inlet 13 can be placed in the air inlet cavity 22 of the base 2; a wire inlet 14 connected with the first central channel 11 is opened on the side wall of the tube body 1 outside the air inlet cavity 22 of the base 2, and the high-speed airflow flowing through the first central channel 11 can form a negative pressure at the wire inlet 14 and suck the yarn in, and the rotation direction of the high-speed airflow in the first central channel 11 is opposite to the twist direction of the yarn.

[0043] By adopting the lateral air inlet 13 that can be directly placed inside the air inlet cavity 22 of the base 2, the airflow in the air inlet cavity 22 of the base 2 can directly rotate through the lateral air inlet 13 to enter the second central channel 12 and flow into the first central channel 11. This arrangement makes the airflow flow path shorter than the existing structure and reduces gas loss; an airflow with a fixed rotation direction is introduced into the lateral air inlet 13 at the bottom of the second central channel 12 to provide a fixed rotation direction and stable and reliable detwisting airflow for the first central channel 11; the gas inlet 21 of the second central channel 12, whose inner diameter is smaller than the inner diameter of the air inlet cavity 22 of the base 2 and the inner diameter of the first central channel 11, is introduced into the second central channel 12. The Venturi tube structure design of the diameter is matched with the wire inlet 14, so that the negative pressure formed by the high-speed rotating airflow at the wire inlet 14 is used to suck the end of the yarn from the wire inlet 14, and the upward airflow of the high-speed rotating airflow is used to impact the tail end of the yarn and pull the internal limit of the yarn to untwist. The yarn inlet position is located on the flow path of the high-speed rotating airflow, so that the untwisting effect is achieved when the yarn is sucked in. The high-speed rotating airflow actively untwists the yarn, thereby improving the yarn untwisting effect; its overall structure is simple and easy to process, and when installing, only the end of the tube body 1 with the lateral air inlet 13 needs to be inserted into the air inlet cavity 22 of the base 2 for sealing, and the installation is simple and convenient.

[0044] Specifically, the high-speed rotating airflow passing through the second central channel 12 rotates directly along the axis of the first central channel 11, and the airflow resistance is small, which can ensure a higher airflow velocity.

[0045] Specifically, the position of the negative pressure area formed by the high-speed rotating airflow entering the first central channel 11 through the second central channel 12 can be determined based on the airflow simulation effect, thereby determining the optimal position of the line inlet 14; the associated parameters used for adjustment include but are not limited to the size of the gas inlet 21 of the air inlet cavity 22 of the base 2, the inner diameter of the second central channel 12, the inner diameter of the first central channel 11, the size of the air inlet cavity 22, the relative position of the tube body 1 relative to the air inlet cavity 22, the relative position of the end of the tube body 1 with the lateral air inlet 13 located in the air inlet cavity 22, etc.

[0046] Specifically, the rotation direction of the airflow in the tube body 1 is more actively formed, and the relationship between "air pressure-untwisting airflow speed" is more linear. It is convenient to change the rotating airflow by adjusting the air pressure, so as to conveniently adjust the process parameters for yarns with different twist coefficients, greatly increase the applicability range of untwisted yarns, and facilitate the unified adjustment of several untwisting tubes on the same vehicle.

[0047] Wherein, regarding the relative position between the first central channel 11 and the second central channel 12:

[0048] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 7 As shown, the first central channel 11 and the second central channel 12 are coaxially arranged. The first central channel 11 and the second central channel 12 are coaxially arranged, so that the high-speed airflow in the second central channel 12 can flow through the first central channel 11 more evenly and stably, thereby improving the untwisting effect of the yarn in the first central channel 11.

[0049] Among them, regarding the setting of the lateral air inlet 13:

[0050] Specifically, the number, position, size and other parameters of the lateral air inlet 13 can be determined according to the actual air flow simulation effect, including but not limited to: Figure 1 The two structures shown in the figure are arranged in opposite directions and deviate from the axis of the tube body 1; each lateral air inlet 13 is used to evenly and rotationally allow the airflow in the air inlet cavity 22 to enter the second central channel 12.

[0051] Among the optional solutions of this embodiment, it is more preferred that Figure 1 to Figure 3 and Figure 7 and Figure 8 As shown, there are two lateral air inlets 13, and the high-speed airflow has the same rotation direction in the second central channel 12 after entering the second central channel 12 through each lateral air inlet 13. Two lateral air inlets 13 with the same rotation direction are used to provide a more stable and reliable high-speed rotating airflow through two air flows.

[0052] Specifically, when the airflow in the air inlet cavity 22 of the base 2 flows through the lateral air inlet 13 on the tube body 1 and enters the second central channel 12 , the airflow can form an untwisting airflow with a counterclockwise Z twist or a clockwise S twist in the second central channel 12 .

[0053] Specifically, the untwisting tube for forming the anti-clockwise Z twist or the clockwise S twist can be determined as required.

[0054] Specifically, the lateral air inlet 13 may also be provided with a corresponding rotation direction, so as to facilitate the airflow in the air inlet cavity 22 of the base 2 to flow better from the second central channel 12 to the first central channel 11 in the forward direction after passing through the lateral air inlet 13 .

[0055] Among them, regarding the structure of the line inlet 14:

[0056] Among the optional solutions of this embodiment, it is more preferred that Figure 1 As shown, the inlet 14 is an inclined opening with the end facing the outlet 15. The inlet 14 adopts a structure of an inclined opening with the end facing the outlet 15, which improves the smooth movement of the yarn towards the outlet 15 after entering the first central channel 11.

[0057] Specifically, the end of the inlet 14 is toward the outlet 15, that is, the end of the inlet 14 close to the axis of the tube body 1 is closer to the outlet 15, that is, the untwisted tube is Figure 1 In the state shown, the end of the wire inlet 14 away from the axis of the tube body 1 is lower than the end of the wire inlet 14 close to the axis of the tube body 1 in the vertical direction.

[0058] Embodiment 2

[0059] This embodiment provides a detwisting device 100, such as Figure 2-3 and Figure 6 to Figure 8 As shown, it includes a base 2 and an untwisting tube as in the first embodiment, the base 2 is provided with an air inlet cavity 22, a gas inlet 21 and a gas outlet 23, the gas inlet 21 and the gas outlet 23 are both connected with the air inlet cavity 22, and the gas inlet 21 is used to introduce compressed gas; the tube body 1 has one end of each lateral air inlet 13 sealed and fixed at the gas outlet 23, and the tube body 1 has one end of each lateral air inlet 13 located in the air inlet cavity 22 and having a gap with each inner wall of the air inlet cavity 22. The air inlet cavity 22 provided by the base 2 provides more stable and reliable compressed gas, and when in use, the untwisting tube only needs to be inserted and fixed at the gas outlet 23, which is convenient for disassembly and assembly, and daily maintenance is also more convenient and reliable. The base 2 and the untwisting tube are combined to provide a stable and reliable untwisting airflow, improve the yarn untwisting effect, have a short airflow path, less gas loss, and a simple structure.

[0060] Specifically, the main function of the base 2 is to provide air intake and to fix and support the untwisting tube; the main function of the untwisting tube is to untwist the yarn.

[0061] In order to facilitate the yarn to enter the yarn inlet 14 more stably, the following settings can also be made:

[0062] Among the optional solutions of this embodiment, it is more preferred that Figure 2 and Figure 3 As shown, a guide groove 24 is provided at a position corresponding to the wire inlet 14 of the untwisting tube on the base 2, and the end of the guide groove 24 close to the wire inlet 14 is in a contracted state and can guide the yarn into the wire inlet 14. The setting of the guide groove 24 on the base 2 can facilitate the yarn to enter the wire inlet 14 more smoothly, thereby improving work efficiency.

[0063] Among them, regarding the connection structure between the untwisting tube and the base 2:

[0064] Among the optional solutions of this embodiment, it is more preferred that Figure 2-3 As shown, the untwisting tube is detachably sealed and fixed at the gas outlet 23. The untwisting tube is detachably arranged at the gas outlet 23, which can facilitate the disassembly and assembly of the untwisting tube and facilitate daily maintenance.

[0065] Specifically, the detachable connection between the untwisting tube and the base 2 includes but is not limited to the following: first, the tube body 1 can be sealed and inserted and fixed at the gas outlet 23 by means of interference fit; second, an external thread is provided on the outer side of the end of the tube body 1 having the lateral air inlet 13, and an internal thread is provided inside the gas outlet 23, and the external thread and the internal thread are fixedly connected; third, a connecting foot can be fixedly provided on the side wall of the end of the tube body 1 having the lateral air inlet 13, and mounting holes are provided at corresponding positions of the connecting foot and the base 2, and the connecting foot is fixed to the base 2 by bolts and other connecting parts.

[0066] Specifically, when the untwisting tube is connected to the base 2, necessary sealing components, such as sealing rings, etc., may be added at the connection.

[0067] Specifically, when the connection is made by interference fit, the connection height and sealing performance can also be improved by glue connection.

[0068] Among them, in order to ensure that the untwisting tube is installed in place, the following settings can also be made:

[0069] Among the optional solutions of this embodiment, it is more preferred that Figure 1 to Figure 3As shown, a first limiting surface 231 is provided at the gas outlet 23, and a second limiting surface 16 is provided on the tube body 1; when one end of the tube body 1 having the lateral air inlet 13 is located in the air inlet cavity 22, the first limiting surface 231 and the second limiting surface 16 are attached to and restrict the one end of the tube body 1 having the lateral air inlet 13 from continuing to move into the air inlet cavity 22. The first limiting surface 231 and the second limiting surface 16 can be set as the insertion limit of the untwisting tube at the gas outlet 23, thereby ensuring that the untwisting tube is installed in place, and preventing the untwisting tube from being inserted too much, resulting in the bottom of the untwisting tube being attached to the inner bottom surface of the air inlet cavity 22, thereby restricting the flow of air in the air inlet cavity 22.

[0070] Specifically, the first limiting surface 231 and the second limiting surface 16 may be arranged in any existing manner, including but not limited to: Figure 2-3 In the structure shown, a limiting groove is provided at the gas outlet 23, the inner diameter of the limiting groove is larger than the inner diameter of the gas outlet 23, and the annular end surface of the limiting groove close to the gas outlet 23 forms a first limiting surface 231. At this time, the inner diameter of one end of the tube body 1 having the lateral air inlet 13 is reduced, and the annular end surface connected to the outer wall of the tube body 1 forms a second limiting surface 16.

[0071] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A detwisting tube, characterized in that: Includes tube body; The tube body has a first central channel and a second central channel, the inner diameter of the second central channel is smaller than the inner diameter of the gas inlet of the air inlet cavity of the base, and the inner diameter of the second central channel is smaller than the inner diameter of the first central channel; One end of the first central channel is opened as a wire outlet, and the other end of the first central channel is connected and communicated with one end of the second central channel; the second central channel is closed at one end away from the first central channel; At least one lateral air inlet is provided on the side wall of the tube body, the lateral air inlet is connected to the second central channel and the lateral air inlet can guide the airflow to enter the second central channel in a rotating shape and flow toward the first central channel, and one end of the tube body having each lateral air inlet can be placed in the air inlet cavity of the base; A wire inlet connected to the first central channel is provided on the side wall of the tube body outside the air inlet cavity of the base, and the high-speed airflow flowing through the first central channel can form a negative pressure at the wire inlet and suck the yarn in, and the rotation direction of the high-speed airflow in the first central channel is opposite to the twist direction of the yarn.

2. The untwisting tube according to claim 1, characterized in that: The number of the lateral air inlets is 2, and after the high-speed airflow enters the second central channel through each of the lateral air inlets, the rotation direction in the second central channel is the same.

3. The untwisting tube according to claim 1, characterized in that: The first central channel and the second central channel are coaxially arranged.

4. The untwisting tube according to claim 1, characterized in that: The line inlet is an inclined opening with its end facing the line outlet.

5. A detwisting device, characterized in that: It comprises a base and an untwisting tube as claimed in any one of claims 1 to 4, wherein the base has an air inlet cavity, a gas inlet and a gas outlet, the gas inlet and the gas outlet are both connected to the air inlet cavity, and the gas inlet is used to introduce compressed gas; One end of the tube body having each of the lateral air inlets is sealed and fixed at the gas outlet, and one end of the tube body having each of the lateral air inlets is located in the air inlet cavity and has a gap with each inner wall of the air inlet cavity.

6. The untwisting device according to claim 5, characterized in that: A guide groove is provided on the base at a position corresponding to the wire inlet of the untwisting tube, and one end of the guide groove close to the wire inlet is in a contracted state and can guide the yarn to enter the wire inlet.

7. The untwisting device according to claim 5, characterized in that: The untwisting tube is detachably sealed and fixed at the gas outlet.

8. The untwisting device according to claim 5, characterized in that: The gas outlet is provided with a first limiting surface, and the tube body is provided with a second limiting surface; When the end of the tube body having the lateral air inlet is located in the air inlet cavity, the first limiting surface abuts against the second limiting surface and restricts the end of the tube body having the lateral air inlet from continuing to move into the air inlet cavity.

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