Ventilation pipeline closing device

Abstract

The utility model discloses a ventilation pipeline closing device which is characterized in that a first pulling device and a second pulling device play a pulling role, and the driving end of a closing executing mechanism is in pulling connection with the second pulling device. An exhaust hole is formed in the side portion of a cylinder of the closing executing mechanism, one end of a closing executing rod is fixedly connected with the second pulling device, the closing executing rod penetrates through the exhaust hole, the other end of the closing executing rod is fixedly connected with a housing, and the closing executing rod drives the housing to cover or be away from the exhaust hole. The problems that in the prior art, due to the fact that a valve body is complex in structure, the valve body cannot be smoothly closed, and the closing effect of the valve body is easily affected are solved. The ventilation pipeline closing device has no lateral acting force on the closing execution rod, it is guaranteed that the housing does not deviate, and then the closing effect of the whole closing device is guaranteed. Through the sealing mode of the elastic leather film, not only can elastic driving power be provided, but also the defect that in the prior art, a spring driving mode is adopted, and clamping is likely to happen due to spring driving can be overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of valve body external auxiliary closing structure design, in particular to a ventilation pipeline closing device. Background Art

[0002] As an energy source, gas has a wide range of uses in industrial production or daily life. Gas is generally transmitted through pipelines. When gas is transmitted in pipelines, once a leak occurs, the consequences will be very serious. When gas leaks during pipeline transmission, in order to be able to take timely measures, control valves are generally installed on pipelines to prevent gas leakage.

[0003] In daily life, there are some potential safety hazards when using household gas pipelines. People often need to close the main gas valve when going out, or forget to close the valve when the household gas pipeline is not in use, which can easily cause gas poisoning or cause fires, explosions and other accidents.

[0004] Therefore, automatic shutoff of gas after use has become a matter that must be taken seriously when a family or business uses gas. However, in the prior art, there are still certain defects in the automatic shutoff device for gas.

[0005] In the prior art, there are some timing valve bodies (such as self-closing valves or pressure reducing valves, etc.), but due to the small size of the valve body, but the need to realize the timing function requires a more complex structure, resulting in the timing function cannot achieve the closing of the valve body well.

[0006] It can be seen that in the prior art, the valve body can only be closed through the closing structure inside the valve body. However, in order to add some auxiliary closing functions, such as timed closing, the structure of the entire valve body is complicated, resulting in the valve body being unable to close smoothly, which easily affects the closing effect of the valve body. Utility Model Content

[0007] In view of this, the main purpose of the utility model is to provide a ventilation duct closing device that ensures the sealing effect of the cover shell, provides driving force through an elastic membrane instead of a spring, and improves the closing stability of the closing device.

[0008] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0009] A ventilation duct closing device comprises: a closing actuator, a first pulling device and a second pulling device, wherein the first pulling device and the second pulling device are pulled, and a driving end of the closing actuator is pulled and connected with the second pulling device;

[0010] In a preferred embodiment, the closing actuator comprises: a closing actuator rod, a cover shell and a cylinder, a vent hole is opened on the side of the cylinder, one end of the closing actuator rod is fixedly connected to the second pulling device, the closing actuator rod is arranged through the vent hole, the other end of the closing actuator rod is fixedly connected to the cover shell, and the closing actuator rod drives the cover shell to cover or move away from the vent hole;

[0011] In a preferred embodiment, a ventilation gap is provided between the closing actuator rod and the exhaust hole.

[0012] In a preferred embodiment, the first pulling device and the second pulling device are magnetic members that magnetically attract each other.

[0013] In a preferred embodiment, the first pulling device and the second pulling device are magnets respectively;

[0014] In a preferred embodiment, one of the first pulling device and the second pulling device is a magnet and the other is a magnetic material piece.

[0015] In a preferred embodiment, the closing actuator rod comprises: a sliding rod, an elastic membrane and a connecting tube, the outer wall of one end of the sliding rod is provided with a stepped shaft, the outer wall of the stepped shaft is provided with an external thread, the inner wall of the connecting tube is provided with an internal thread, the outer wall of the stepped shaft is sleeved with the elastic membrane, the end of the stepped shaft is threadedly connected to the connecting tube, and the connecting tube presses the elastic membrane;

[0016] In a preferred embodiment, the other end of the connecting tube is fixedly connected to the second pulling device;

[0017] In a preferred embodiment, the other end of the sliding rod is fixedly connected to the cover shell.

[0018] In a preferred embodiment, the elastic membrane is a circular structure with a membrane hole in the center, and the stepped shaft is arranged through the membrane hole;

[0019] In a preferred embodiment, the position between the membrane hole and the edge of the elastic membrane protrudes toward the side close to the second pulling device, so that the second pulling device is pulled to have a set deformation amount.

[0020] In a preferred embodiment, a support frame is fixedly connected to the center of the exhaust hole, and the sliding rod passes through the center of the support frame.

[0021] In a preferred embodiment, a membrane installation opening is provided on a side of the cylinder away from the exhaust hole, and the edge of the elastic membrane is pressed, sealed and fixed at the membrane installation opening.

[0022] In a preferred embodiment, it further comprises: a sealing shell, wherein the sealing shell is sealingly connected to the outer wall of the ventilation duct, and the closing actuator and the second pulling device are both arranged inside the sealing shell.

[0023] In a preferred embodiment, an air inlet hole and an air outlet hole are opened inside the ventilation duct conductive sealing shell, and the cylinder is sealed and connected to the air outlet hole.

[0024] In a preferred embodiment, the lower end of the cylinder is open, the lower end of the cylinder is cylindrical, an external thread is provided on the outer wall of the cylinder, an internal thread is provided on the inner wall of the air outlet, and the lower end of the cylinder is sealed and connected to the inside of the air outlet;

[0025] In a preferred embodiment, the opening at the lower end of the cylinder is connected to the exhaust hole;

[0026] In a preferred embodiment, the upper side of the cylinder body close to the exhaust hole is a planar structure.

[0027] The ventilation duct closing device of the utility model has the following beneficial effects:

[0028] The ventilation duct closing device comprises: a closing actuator, a first pulling device and a second pulling device, the first pulling device and the second pulling device have a pulling effect, and the driving end of the closing actuator is pulled and connected with the second pulling device; the closing actuator comprises: a closing actuator rod, a cover and a cylinder, the side of the cylinder is provided with an exhaust hole, one end of the closing actuator rod is fixedly connected to the second pulling device, the closing actuator rod is arranged through the exhaust hole, the other end of the closing actuator rod is fixedly connected to the cover, the closing actuator rod drives the cover to cover or move away from the exhaust hole; a ventilation gap is left between the closing actuator rod and the exhaust hole.

[0029] The problem in the prior art that the valve body can only be closed by a closing structure inside the valve body, but in order to add some auxiliary closing functions, such as timed closing, the structure of the entire valve body is complicated, resulting in the valve body being unable to close smoothly, which easily affects the closing effect of the valve body.

[0030] The ventilation duct closing device has a reasonable overall structural design. By arranging the cover shell at the end of the closing actuator rod, the cover shell is evenly stressed all around and there is no lateral force on the closing actuator rod, thereby ensuring that the cover shell does not deviate, improving the sealing effect, and thus ensuring the closing effect of the entire closing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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 or the description of the prior art 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.

[0032] Figure 1 It is a structural schematic diagram of a ventilation duct closing device according to an embodiment of the present disclosure;

[0033] Figure 2 A schematic diagram of the structure of a ventilation duct of a ventilation duct closing device according to an embodiment of the present disclosure;

[0034] Figure 3 is a cross-sectional view of a ventilation duct closing device according to an embodiment of the present disclosure;

[0035] Figure 4 It is a structural schematic diagram of a closing actuator rod of a ventilation duct closing device according to an embodiment of the present disclosure;

[0036] Figure 5 It is a schematic structural diagram of a cylinder of a ventilation duct closing device according to an embodiment of the present disclosure.

[0037]

Main component symbol description

[0038] 01. Ventilation duct;

[0039] 011, air inlet; 012, air outlet;

[0040] 02. Valve body;

[0041] 03. Timer;

[0042] 1. The first pulling device;

[0043] 2. The second pulling device;

[0044] 3. Close the actuator;

[0045] 311, closing actuator rod; 3111, sliding rod;

[0046] 3112, elastic membrane; 3113, connecting tube; 3114, stepped shaft;

[0047] 312, cover;

[0048] 313, cylinder; 314, exhaust hole; 315, cylinder; 316, membrane installation port;

[0049] 317, support frame;

[0050] 6. Sealed shell. DETAILED DESCRIPTION

[0051] The ventilation duct closing device of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments of the present invention.

[0052] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0056] like Figure 1-Figure 5 As shown, the ventilation duct closing device comprises: a closing actuator 3 capable of closing the ventilation duct 01, a first pulling device 1 and a second pulling device 2 that transmit a driving force to the closing actuator 3 through interaction. The first pulling device 1 and the second pulling device 2 act in a pulling manner, and the driving end of the closing actuator 3 is pulled and connected to the second pulling device 2.

[0057] In order to facilitate the closing of the ventilation duct 01, ensure the closing effect, reduce the structural complexity of the entire closing actuator 3, and thus reduce the failure rate of the entire product. The closing actuator 3 includes: a closing actuator rod 311 that transmits motion, a cover 312 that conducts and closes the ventilation duct 01, and a cylinder 313 that changes the flow direction of gas in the ventilation duct 01. In order to facilitate the sealing and disconnecting of the ventilation duct 01 (to achieve the function of closing the ventilation duct 01), an exhaust hole 314 is opened on the side of the cylinder 313, and one end of the closing actuator rod 311 is fixedly connected to the second pulling device 2. The closing actuator rod 311 is set through the exhaust hole 314, and the other end of the closing actuator rod 311 is fixedly connected to the cover 312. The closing actuator rod 311 drives the cover 312 to cover or move away from the exhaust hole 314;

[0058] The closing actuator rod 311 is arranged along the center of the exhaust hole 314. During the process of the second pulling device 2 performing the pulling action, the cover 312 exerts a balanced force on the closing actuator rod 311 on all sides, avoiding the deviation of the closing actuator rod 311, improving the closing and sealing effect between the cover 312 and the exhaust hole 314, and improving the stability of the air cut-off of the ventilation pipeline 01.

[0059] Of course, in order to avoid the ventilation being affected by the closing actuator rod 311, it is ensured that ventilation can be smoothly performed and the ventilation amount can be ensured when the cover 312 is away from the exhaust hole 314. A ventilation gap is provided between the closing actuator rod 311 and the exhaust hole 314. When the cover 312 is open, the gas can smoothly flow through the ventilation gap.

[0060] By arranging the first pulling device 1 on the mechanism that triggers the requirement, when the first pulling device 1 reaches the set requirement, it can pull the second pulling device 2, thereby realizing the driving effect on the closing actuator 3.

[0061] Here: the triggering requirement mechanism can be a variety of triggering requirements. For example, in the present application, it can be the timer 03 of the self-closing valve, and the timer 03 is arranged on the upper side of the valve body 02. The first pulling device 1 is fixedly connected to the side wall of the timer 03. When the timer 03 rotates to the specified position, the first pulling device 1 absorbs the second pulling device 2, thereby realizing the lateral driving effect on the closing actuator 3. Then, the exhaust hole 314 is sealed by the cover 312, so that the ventilation duct 01 can be conveniently closed.

[0062] Preferably, the first pulling device 1 is arranged at the position of the timer at zero. When the timer 03 rotates to zero, the first pulling device 1 and the second pulling device 2 act.

[0063] Further preferably, when the timer 02 rotates to zero, the first pulling device 1 and the second pulling device 2 are closest to each other, so that the function between the first pulling device 1 and the second pulling device 2 can be better realized.

[0064] In order to ensure the compactness of the structure, the first pulling device 1 and the second pulling device 2 can achieve the effect between them when they reach the set distance position (the closest position). Therefore, it is preferred that the first pulling device 1 and the second pulling device 2 are magnetic parts that have a mutual magnetic attraction effect. The timer rotates during use, and when the timing ends, the distance between the first pulling device 1 and the second pulling device 2 reaches the set distance. The first pulling device 1 absorbs the second pulling device 2, thereby pulling the closing actuator 3 to achieve the closing of the ventilation duct 01.

[0065] Preferably, the first pulling device 1 and the second pulling device 2 are magnets respectively;

[0066] Preferably, one of the first pulling device 1 and the second pulling device 2 is a magnet and the other is a magnetic material (one is a magnet and the other is a material that can be absorbed by the magnet (including a magnet)).

[0067] In one embodiment, the first pulling device 1 and the second pulling device 2 are magnets respectively; although the two magnets slightly increase the cost, the magnetic effect is good and can ensure the smooth progress of the driving action.

[0068] In another embodiment, one of the first pulling device 1 and the second pulling device 2 is a magnet and the other is a magnetic material. That is, as long as the first pulling device 1 and the second pulling device 2 can attract each other when they reach a set distance, the cost of selecting a permanent magnet is reduced, and the magnetic material (such as an iron block) is low in cost.

[0069] In a preferred embodiment, the closing actuator rod 311 includes: a sliding rod 3111 with a sliding guide function, an elastic membrane 3112 that provides a certain elastic deformation and can ensure the sealing of both sides during the telescopic process, and a connecting tube 3113 that facilitates the connection auxiliary function. In order to facilitate the fixed connection of the elastic membrane 3112, the sealing effect can be ensured. The outer wall of one end of the sliding rod 3111 is provided with a stepped shaft 3114, the outer wall of the stepped shaft 3114 is provided with an external thread, the inner wall of the connecting tube 3113 is provided with an internal thread, the outer wall of the stepped shaft 3114 is sleeved with an elastic membrane 3112, the end of the stepped shaft 3114 is threadedly connected to the connecting tube 3113, and the connecting tube 3113 presses the elastic membrane 3112; because the elastic membrane 3112 has a certain deformation space, and can satisfy the sliding of the sliding rod 3111 in this deformation space, and can drive the sliding rod 3111, thereby avoiding the use of other auxiliary driving parts, such as using a spring to provide a restoring force, resulting in an increase in the number of parts, thereby increasing the defect of the failure rate of the product. In this embodiment, the elastic properties of the rubber material of the elastic membrane 3112 are utilized, and the second pulling device 2 is deformed during the pulling process. The elasticity of the elastic membrane 3112 provides a restoring force, thereby providing a driving force for the sliding of the sliding rod 3111.

[0070] In order to facilitate the connection between the connecting tube 3113 and the second pulling device 2, the other end of the connecting tube 3113 is fixedly connected to the second pulling device 2. A hole can be opened in the second pulling device 2, and a screw is passed through it. The screw and the connecting tube 3113 are threadedly connected, thereby realizing the compression and fixation of the second pulling device 2.

[0071] Of course, in order to realize the driving effect on the cover shell 312, the other end of the sliding rod 3111 is fixedly connected to the cover shell 312.

[0072] In order to ensure that the elastic membrane 3112 drives the sliding rod 3111 in a straight line and reduce the possibility of tilting the sliding rod 3111, the elastic membrane 3112 is a circular structure with a membrane hole in the center, and the stepped shaft 3114 is arranged through the membrane hole. During the deformation process of the elastic membrane 3112, the force acting on the sliding rod 3111 is on the axis of the sliding rod 3111, thereby driving the cover 312 to slide in a straight line, achieving the sealing effect of the cover 312.

[0073] In order to satisfy the driving force to the side away from the second pulling device 2, the cover 312 can be driven to open by the elastic membrane 3112 on the sliding rod 3111 when the second pulling device 2 is lost. The position between the membrane hole and the edge of the elastic membrane 3112 is convex toward the side close to the second pulling device 2, so that the second pulling device 2 is pulled with a set deformation amount. That is, when the second pulling device 2 is pulled, the elastic membrane 3112 is deformed, and the sufficient deformation amount ensures the closure of the cover 312. When the second pulling device 2 loses its function, the cover 312 is driven to open by elastic recovery of the deformation.

[0074] In order to further improve the supporting effect of the sliding rod 3111 and ensure that the sliding rod 3111 slides along the axis without deviation, the center of the exhaust hole 314 is fixedly connected or integrally formed with a support frame 317, and the sliding rod 3111 passes through the center of the support frame 317. The support of the support frame 317 ensures the support stability of the sliding rod 3111. The support frame 317 can be integrally formed with the cylinder 313, or can be fixedly connected to the cylinder 313, as long as it can meet the ventilation volume and support the sliding rod 3111.

[0075] Of course, in order to facilitate the installation and fixation of the elastic membrane 3112, a membrane installation opening 316 is opened on the side of the cylinder 313 away from the exhaust hole 314, and the edge of the elastic membrane 3112 is pressed and sealed at the membrane installation opening 316. The elastic membrane 3112 can be deformed and stretched at the membrane installation opening 316 to avoid interference from the cylinder 313, thereby ensuring the driving force of the elastic membrane 3112 on the sliding rod 3111.

[0076] In order to seal the gas flowing out of the outlet hole 012 and the inlet hole 011 to avoid leakage. It also includes: a sealing shell 6, which is sealed and connected to the outer wall of the ventilation pipe 01, and the closing actuator 3 and the second pulling device 2 are both arranged inside the sealing shell 6. Of course, the sealing shell 6 is made of non-magnetic material to ensure that the first pulling device 1 can adsorb the second pulling device 2 inside the sealing shell 6. In order to meet the conduction effect of the cylinder 313 on the gas, and can also seal the exhaust hole 314 to achieve the closure of the ventilation pipe 01. The ventilation pipe 01 conduction sealing shell 6 is provided with an inlet hole 011 and an outlet hole 012, and the cylinder 313 is arranged at the outlet hole 012. Of course, the ventilation pipe 01 is a sealing structure between the inlet hole 011 and the outlet hole 012. In order to meet the connection effect on the cylinder 313, the conduction effect on the gas can be met through the cylinder 313. The lower end of the cylinder 313 is open and cylindrical. An external thread is provided on the outer wall of the cylinder 315, and an internal thread is provided on the inner wall of the air outlet 012. The lower end of the cylinder 315 is sealed and connected to the inside of the air outlet 012.

[0077] The opening at the lower end of the cylinder 313 is connected to the exhaust hole 314. The gas is ensured to flow in the ventilation pipe 01 as follows: it flows from the air inlet 011 into the sealing shell 6, and then flows from the exhaust hole 314 along the air outlet 012 into the ventilation pipe 01, thereby conveniently realizing the sealing and circuit-breaking function of the cover shell 312.

[0078] In order to facilitate the sealing effect of the exhaust hole 314 and avoid leakage of the exhaust hole 314 in the closed state, which causes the entire ventilation duct 01 to be unable to be disconnected, the upper side of the cylinder 313 near the exhaust hole 314 is a flat structure. The end surface of the exhaust hole 314 with a flat structure can ensure the sealing effect of the cover 312 on the exhaust hole 314.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A ventilation duct closing device, characterized in that: include: A closing actuator (3), a first pulling device (1) and a second pulling device (2), wherein the first pulling device (1) and the second pulling device (2) have a pulling effect, and the driving end of the closing actuator (3) is connected to the second pulling device (2) by pulling; The closing actuator (3) comprises: a closing actuator rod (311), a cover (312) and a cylinder (313); a vent hole (314) is provided on the side of the cylinder (313); one end of the closing actuator rod (311) is fixedly connected to the second pulling device (2); the closing actuator rod (311) is arranged through the vent hole (314); the other end of the closing actuator rod (311) is fixedly connected to the cover (312); the closing actuator rod (311) drives the cover (312) to be covered or moved away from the vent hole (314); A ventilation gap is provided between the closing actuator rod (311) and the exhaust hole (314).

2. The ventilation duct closing device according to claim 1, characterized in that: The first pulling device (1) and the second pulling device (2) are magnetic parts that magnetically attract each other.

3. The ventilation duct closing device according to claim 2, characterized in that: The first pulling device (1) and the second pulling device (2) are magnets respectively; Alternatively, one of the first pulling device (1) and the second pulling device (2) is a magnet and the other is a magnetic material.

4. The ventilation duct closing device according to any one of claims 1 to 3, characterized in that: The closing actuator rod (311) comprises: a sliding rod (3111), an elastic membrane (3112) and a connecting tube (3113); a stepped shaft (3114) is provided on the outer wall of one end of the sliding rod (3111); an external thread is provided on the outer wall of the stepped shaft (3114); an internal thread is provided on the inner wall of the connecting tube (3113); the elastic membrane (3112) is sleeved on the outer wall of the stepped shaft (3114); the end of the stepped shaft (3114) is threadedly connected to the connecting tube (3113); and the connecting tube (3113) presses the elastic membrane (3112); The other end of the connecting tube (3113) is fixedly connected to the second pulling device (2); The other end of the sliding rod (3111) is fixedly connected to the cover shell (312).

5. The ventilation duct closing device according to claim 4, characterized in that: The elastic membrane (3112) is a circular structure with a membrane hole in the center, and the stepped shaft (3114) is arranged through the membrane hole; The position between the membrane hole and the edge of the elastic membrane (3112) is convex toward the side close to the second pulling device (2), so that the second pulling device (2) has a set deformation amount when pulled.

6. The ventilation duct closing device according to claim 5, characterized in that: The center of the exhaust hole (314) is fixedly connected to a support frame (317), and the sliding rod (3111) passes through the center of the support frame (317).

7. The ventilation duct closing device according to claim 5, characterized in that: A membrane installation opening (316) is provided on one side of the cylinder (313) away from the exhaust hole (314), and the edge of the elastic membrane (3112) is pressed and sealed at the membrane installation opening (316).

8. The ventilation duct closing device according to any one of claims 1 to 3, characterized in that: Also includes: A sealing shell (6), wherein the sealing shell (6) is sealingly connected to the outer wall of the ventilation duct (01), and the closing actuator (3) and the second pulling device (2) are both arranged inside the sealing shell (6).

9. The ventilation duct closing device according to claim 8, characterized in that: The ventilation pipe (01) is connected to the sealing shell (6) and is provided with an air inlet (011) and an air outlet (012), and the cylinder (313) is sealed and connected to the air outlet (012).

10. The ventilation duct closing device according to claim 9, characterized in that: The lower end of the cylinder (313) is open, and the lower end of the cylinder (313) is cylindrical. An external thread is provided on the outer wall of the cylinder (315), and an internal thread is provided on the inner wall of the air outlet (012). The lower end of the cylinder (315) is sealed and connected to the inside of the air outlet (012); The opening at the lower end of the cylinder (313) is connected to the exhaust hole (314); The upper side of the cylinder (313) close to the exhaust hole (314) is a planar structure.

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