Air intake and power system

Abstract

The present invention relates to an air intake device and a power system. The air intake device includes an air duct, a fixed part and a movable part. The air duct has a first air outlet. The fixed part is arranged at the first air outlet. The movable part is movably arranged in the air duct and the area from the center to the outer edge of the movable part is equal to the area of ​​the first air outlet. The air duct has two states, namely a first state and a second state. In the first state, the movable part is located at a first position. In the first position, the movable part surrounds the fixed part and the inner annular surface fits the outer annular surface of the fixed part, so that the first air outlet is in a closed state. In the second state, the movable part forms a gap with the fixed part along the length direction of the air duct, so that the first air outlet is in an open state. When the air intake device is not ventilated, the first air outlet is in a closed state, so that the air duct is closed to prevent dust from falling in the air duct. When the air is ventilated, the first air outlet is in an open state, so that the air duct is open. Therefore, the open and closed states of the air duct can be freely selected according to needs.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment gas transmission, and in particular to an air intake device and a power system. Background Art

[0002] Currently, many power systems (such as air compressors and pneumatic engines) are powered by gas. Gas typically enters the power system through the power system's air intake duct, driving the power system to perform corresponding operations. Currently, in order to control the opening and closing of the power system's air intake duct, there is an urgent need to provide an air intake device that can adjust the opening and closing of the air intake duct according to the power system's operating state. Specifically, the air intake device is open when the power system is operating and closed when the power system is shut down. Summary of the Invention

[0003] Based on this, it is necessary to provide an air intake device and a power system to address the above technical problems.

[0004] An air inlet device, comprising: an air duct, a fixed portion, and a movable portion, wherein the air duct has a first air outlet, the fixed portion is disposed at the first air outlet, and the movable portion is movably disposed in the air duct, and an area from a center to an outer edge of the movable portion is equal to an area of ​​the first air outlet;

[0005] The air duct has two states, namely a first state and a second state. In the first state, the movable part is located at a first position. In the first position, the movable part surrounds the fixed part and the inner annular surface of the movable part fits with the outer annular surface of the fixed part, so that the first air outlet is in a closed state; in the second state, the movable part forms a gap with the fixed part along the length direction of the air duct, so that the first air outlet is in an open state.

[0006] The above-mentioned air intake device, when not ventilating, the movable part can be located in the first position, and in the first position, the movable part surrounds the fixed part and its own inner annular surface is in contact with the outer annular surface of the fixed part, so that the first air outlet is in a closed state, the air duct is closed, and dust is prevented from falling in the air duct; when ventilating, the movable part can move along the length direction of the air duct to leave the first position, so that a gap is formed between the movable part and the fixed part in the length direction of the air duct, so that the first air outlet is in an open state, so that the air duct is open, so that the open and closed states of the air duct can be freely selected according to needs, so that the air intake channel of the power system can be opened or closed.

[0007] In one embodiment, the air inlet device further includes an elastic member disposed in the air duct, and in the second state, the elastic member is used to provide a driving force to the movable part to move toward the first position.

[0008] In one embodiment, in the second state, the elastic member is compressed.

[0009] In one embodiment, the inner wall of the air duct extends radially to form a supporting boss, and the elastic member is disposed between the supporting boss and the movable portion.

[0010] In one embodiment, the outer wall of the abutment boss extends in the direction from the abutment boss to the movable part to form a limiting wall, one end of the elastic member is mounted on the limiting wall, and the limiting wall and the inner wall of the air duct jointly limit the radial position of the elastic member.

[0011] In one embodiment, the outer edge of the movable part extends in the direction from the movable part to the abutment boss to form a stop wall, and the movable part can move toward the abutment boss until the movable part is in a second position, and in the second position, the stop wall abuts against the abutment boss.

[0012] In one embodiment, the inner annular surface of the movable part extends radially along the air duct to form a lap boss. When the air duct is in the first state, the upper surface of the lap boss fits tightly against the lower surface of the fixed part to seal the gap between the fixed part and the movable part.

[0013] In one embodiment, when the air duct is in the second state, the movable portion is located at the second position;

[0014] The distance between the inner annular surface of the movable part and the axis of the air duct gradually decreases from the first position to the second position, and the outer annular surface of the fixed part is adapted to the inner annular surface of the movable part.

[0015] In one embodiment, the air inlet device further includes a connecting portion and a supporting portion, the connecting portion is connected to the inner wall of the air duct and the supporting portion, the connecting portion is a hollow structure to allow the airflow in the air duct to pass through, and the supporting portion is used to support the fixing portion at the first air outlet.

[0016] In one embodiment, the connecting portion includes a plurality of connecting ridges, and the connecting ridges are spaced apart along the circumference of the air duct.

[0017] In one embodiment, the number of the connecting ridges is 3, and the connecting ridges are evenly distributed along the circumference of the air duct.

[0018] In one embodiment, a second air outlet is further provided on the air duct, and the area of ​​the second air outlet increases from small to large along the direction of gas flow.

[0019] In one embodiment, the windward area of ​​the fixed portion is equal to the cross-sectional area of ​​the movable portion.

[0020] A power system has an air intake passage, and the power system includes any one of the air intake devices described above, wherein the air intake device is used to open or close the air intake passage.

[0021] In the above-mentioned power system, when the air intake device is not ventilating, the movable part can be located in the first position, and in the first position, the movable part surrounds the fixed part and its own inner annular surface is in contact with the outer annular surface of the fixed part, so that the first air outlet is in a closed state, the air duct is closed, and dust is prevented from falling in the air duct; when the air intake device is ventilating, the movable part can leave the first position to form a gap with the fixed part in the length direction of the air duct, so that the first air outlet is in an open state, so that the air duct is open, so that the open and closed states of the air duct can be freely selected according to needs, so that the air intake channel of the power system can be opened or closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional diagram of an air inlet device provided in one embodiment of the present invention;

[0023] Figure 2 A partial cross-sectional view of an air duct provided in one embodiment of the present invention;

[0024] Figure 3 A partial cross-sectional view of an air inlet device provided by one embodiment of the present invention, with the air duct in a first state;

[0025] Figure 4 A perspective view of the air inlet device provided by one embodiment of the present invention, with the air duct in a second state;

[0026] Figure 5 A partial cross-sectional view of the air inlet device provided by one embodiment of the present invention, with the air duct in the second state;

[0027] Figure 6 A schematic perspective view of an air duct provided by an embodiment of the present invention as viewed from a first angle;

[0028] Figure 7 A partial cross-sectional view of an air inlet device provided by one embodiment of the present invention when the movable portion is subjected to an external force;

[0029] Figure 8 A partial cross-sectional view of the air inlet device provided by one embodiment of the present invention, with the air duct in the second state;

[0030] Figure 9 A schematic perspective view of an air duct provided by an embodiment of the present invention as viewed from a first angle;

[0031] Figure 10This is a three-dimensional schematic diagram of an air duct provided by an embodiment of the present invention viewed from a first angle.

[0032] The reference numerals in the accompanying drawings are described as follows:

[0033] 10. Air inlet device; 100. Air duct; 100a. First air outlet; 100b. Second air outlet; 110. Abutment boss; 120. Limiting wall; 200. Fixing portion; 200a. Outer annular surface; 200b. Mounting through hole; 200b1. First hole section; 200b2. Second hole section; 200c. Step surface; 300. Movable portion; 300a. Inner annular surface; 310. Stop boss; 320. Overlap boss; 400. Elastic member; 500. Connecting portion; 510. Connecting edge; 600. Supporting portion; 600a. Mounting countersunk hole; 20. Suction port. DETAILED DESCRIPTION

[0034] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0037] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0040] like Figure 1 As shown, an embodiment of the present invention provides an air intake device 10, which includes an air duct 100, a fixed portion 200 and a movable portion 300. Figure 2 As shown, the air duct 100 has a first air outlet 100a, the fixed part 200 is arranged at the first air outlet 100a, the movable part 300 is movably arranged in the air duct 100 and the area from the center to the outer edge of the movable part 300 is equal to the area of ​​the first air outlet 100a. The air duct 100 has two states, namely Figure 1 、 Figure 3 The first state shown and Figure 4 、 Figure 5 The second state shown; specifically, as Figure 1 and Figure 3As shown, in the first state, the movable part 300 is located at the first position. In the first position, the movable part 300 surrounds the fixed part 200 and the inner annular surface 300a of the movable part 300 is in contact with the outer annular surface 200a of the fixed part 200, so that the first air outlet 100a is in a closed state; Figure 4 and Figure 5 As shown, in the second state, the movable portion 300 forms a gap with the fixed portion 200 along the length direction of the air duct 100, so that the first air outlet 100a is in an open state.

[0041] The air inlet device 10 can be used to open or close the air intake passage of a power system. This power system can be a gas-powered device such as an air compressor, a pneumatic generator, or a striking device. The striking device is a device that generates kinetic energy from flowing gas, thereby striking components such as vacuum cleaners, dehumidifiers, and water purifiers. This removes dust and other impurities from the components, thereby extending their service life. Taking a vacuum cleaner as an example, when removing dust from the filter inside it, the suction port 20 of the vacuum cleaner can be first inserted into the air duct 100 of the air inlet device 10 and the movable part 300 of the air inlet device 10 can be pushed to move, so that the movable part 300 forms a gap with the fixed part 200 of the air inlet device 10 in the direction of its own movement, so that the first air port 100a of the air duct 100 is in an open state; then the suction port 20 of the vacuum cleaner is used to suck air from the air duct 100 or deliver air into the air duct 100. The air flow can pass through the knocking device, so that the knocking device generates a certain amount of kinetic energy, and the knocking device knocks the filter or the component adjacent to the filter in the vacuum cleaner, causing the filter to vibrate at high frequency, thereby removing impurities such as dust on the filter.

[0042] The above-mentioned air intake device 10, when not ventilating, the movable part 300 can be located in the first position, and in the first position, the movable part 300 surrounds the fixed part 200 and its own inner annular surface 300a is in contact with the outer annular surface 200a of the fixed part 200, so that the first air outlet 100a is in a closed state, the air duct 100 is closed, and dust is prevented from falling in the air duct 100; when ventilating, the movable part 300 moves along the length direction of the air duct 100 to leave the first position, so that in the length direction of the air duct 100, there is a gap between the movable part 300 and the fixed part 200, so that the first air outlet 100a is in an open state, so that the air duct 100 is open, so that the open and closed states of the air duct 100 can be freely selected according to needs, thereby opening or closing the air intake channel of the power system.

[0043] The following describes the various components of the air inlet device 10.

[0044] (1) Air duct 100

[0045] It is understood that the air duct 100 can be formed by a shell, and the inner cavity of the shell is used to pass the airflow. As an example, the shell can be a vertical cylindrical structure.

[0046] like Figure 2 As shown, the air duct 100 may also be provided with a second air outlet 100b, the area of ​​which increases from small to large along the direction of gas flow. This allows the air duct 100 to curve, preventing straight airflow in and out. Furthermore, the muffler principle (i.e., the second air outlet 100b expands and spreads out) is utilized to reduce noise. Optionally, the second air outlet 100b is positioned opposite the first sealing opening and is distributed sequentially along the axial direction of the housing.

[0047] (2) Fixing portion 200

[0048] In some embodiments of the present invention, the frontal area of ​​the fixed portion 200 is equal to the cross-sectional area of ​​the movable portion 300. This ensures maximum ventilation efficiency for the air duct 100. It should be noted that the frontal area of ​​the fixed portion 200 refers to the side area of ​​the fixed portion 200 opposite the air inlet of the air duct 100. The air inlet of the air duct 100 can be the first air inlet 100a or the second air inlet 100b, which is mainly related to the airflow direction of the air duct 100.

[0049] In addition, regarding the installation method of the fixing part 200 in the air duct 100, this application provides an example: Figure 6 As shown, the air inlet device 10 further includes a connecting portion 500 and a supporting portion 600. The connecting portion 500 is connected to the inner wall of the air duct 100, the fixing portion 200, and the supporting portion 600. The connecting portion 500 is a hollow structure to allow airflow within the air duct 100 to pass through. The supporting portion 600 is used to support the fixing portion 200 at the first air outlet 100a. The connection portion 500 and the supporting portion 600 cooperate to firmly support the fixing portion 200 at the first air outlet 100a.

[0050] Among them, in some embodiments of the present invention, such as Figure 6 As shown, the connecting portion 500 includes a plurality of connecting ribs 510, which are spaced apart along the circumference of the air duct 100. This structure of the connecting portion 500 is not only simple in structure but also facilitates the flow of air within the air duct 100. It will be appreciated that the air within the air duct 100 flows through the gaps between adjacent connecting ribs 510.

[0051] Optionally, the connecting rib 510 can be connected to the support portion 600 and the inner wall of the air duct 100 by welding, bonding, integral molding, etc. In addition, the connecting rib 510 can be a cylindrical rod, a multi-sided rod (such as a triangular rod, a quadrangular rod, a pentagonal rod), etc.

[0052] Optionally, the connecting ribs 510 are evenly distributed along the circumference of the air duct 100. Arranging the connecting ribs 510 in this way can make the support portion 600 bear the force evenly and can support the fixing portion 200 more stably. Figure 9 The two shown, Figure 6 The three shown, Figure 10 Preferably, three connecting ribs 510 can be provided, and the structure of the three ribs is stable and has a large ventilation area.

[0053] In addition, in some embodiments of the present invention, the fixing portion 200 is fixed to the support portion 600 via a screw. Connecting the fixing portion 200 to the support portion 600 via the screw facilitates assembly and disassembly of the fixing portion 200. The screw may be a screw. Of course, in other embodiments, the fixing portion 200 may be threadedly connected to the support portion 600 by providing a screw structure or a threaded hole structure, which also facilitates assembly and disassembly of the fixing portion 200.

[0054] Specifically in some embodiments of the present invention, such as Figure 5 As shown, the fixing portion 200 is provided with a mounting through-hole 200b along the axial direction of the air duct 100, and the support portion 600 is provided with a mounting countersunk hole 600a at the end near the fixing portion 200. The mounting through-hole 200b corresponds to the mounting countersunk hole 600a, and the screw member is fixed in the mounting through-hole 200b and the mounting countersunk hole 600a. It will be understood that the wall of the mounting countersunk hole 600a is provided with threads that match the threads on the screw member.

[0055] Alternatively, as Figure 5 As shown, mounting hole 200b includes a first hole section 200b1 and a second hole section 200b2. The diameter of first hole section 200b1 is larger than that of second hole section 200b2, and second hole section 200b2 is located closer to support portion 600. The head of the threaded member is located in first hole section 200b1, while the screw rod of the threaded member passes through second hole section 200b2 and enters mounting counterbore 600a. This structure of mounting hole 200b not only meets the requirements for threaded member insertion, but also prevents the head of the threaded member from protruding from fixing portion 200, thereby preventing the head of the threaded member from scratching related components of the power system.

[0056] Alternatively, as Figure 5As shown, a stepped surface 200c is provided on the end of the fixing portion 200 near the support portion 600, and the end of the supporting portion 600 near the fixing portion 200 abuts against the stepped surface 200c. During assembly, the fixing portion 200 is directly docked onto the supporting portion 600 using the stepped surface 200c of the fixing portion 200. This facilitates the installation of the threaded member and can speed up the installation process of the threaded member. Of course, in some other embodiments, a stepped surface 200c is provided on the end of the supporting portion 600 near the fixing portion 200, and the end of the fixing portion 200 near the support portion 600 abuts against the stepped surface 200c.

[0057] (3) Movable part 300

[0058] like Figure 4 and Figure 5 As shown, in some embodiments of the present invention, the inner annular surface 300a of the movable portion 300 extends radially along the air duct 100 to form an overlapping boss 320. When the air duct 100 is in the first state, the upper surface of the overlapping boss 320 tightly contacts the lower surface of the fixed portion 200 to seal the gap between the fixed portion 200 and the movable portion 300. The overlapping boss 320, on the one hand, can serve as a secondary seal, ensuring the airtightness of the air duct 100 in the first state; on the other hand, it can limit the distance that the movable portion 300 can move toward the fixed portion 200, preventing the movable portion 300 from protruding from the fixed portion 200 due to excessive movement and thus failing to close the second air port 100b. It should be noted that the primary seal refers to the initial seal of the air duct 100 formed when the inner annular surface 300a of the movable portion 300 contacts the outer annular surface 200a of the fixed portion 200 when the air duct 100 is in the first state. The distance between the inner annular surface 300a of the movable portion 300 and the axis of the air duct 100 gradually decreases from the first position to the second position, and the outer annular surface 200a of the fixed portion 200 mates with the inner annular surface 300a of the movable portion 300. This structure of the movable portion 300 and the fixed portion 200 not only ensures a reliable seal between the movable portion 300 and the fixed portion 200, but also guides the movement of the movable portion 300, preventing the movable portion 300 from getting stuck during movement.

[0059] Optionally, the inner annular surface 300 a of the movable portion 300 may be an inclined surface or an arcuate surface. It is understood that the specific structure of the fixed outer annular surface 200 a is the same as that of the movable portion 300 .

[0060] In addition, regarding how the movable part 300 returns to the first position when the external force is removed, the present application provides an example: Figure 3 and Figure 5As shown, the air inlet device 10 may further include an elastic member 400 disposed in the air duct 100. In the second state, the elastic member 400 is used to provide a driving force for the movable part 300 to move toward the first position. Figure 7 When the suction port 20 is inserted into the air duct 100, the movable part 300 moves in the air duct 100, so that a gap is generated between the movable part 300 and the fixed part 200 in the longitudinal direction of the air duct 100, thereby opening the first opening of the air duct 100, so that the state of the air duct 100 is adjusted from the first state to the second state, and the movable part 300 also drives the elastic member 400 to deform during the movement; when the external force on the movable part 300 is removed (for example, Figure 7 When the suction port 20 is removed from the air duct 100 (as shown), the elastic member 400 returns to its original position, thereby providing a driving force to the movable portion 300 to move toward the first position. The movable portion 300 then moves toward the first position, thereby cooperating with the fixed portion 200 to close the air duct 100. It can be seen that when the external force on the movable portion 300 is removed, the elastic member 400 can drive the movable portion 300 toward the first position, thereby closing the air duct 100. There is no need for manual actuation of the movable portion 300 to close the air duct 100.

[0061] Furthermore, in some embodiments of the present invention, Figure 5 As shown, the inner wall of the air duct 100 extends radially to form an abutment boss 110, and the elastic member 400 is disposed between the abutment boss 110 and the movable portion 300. The abutment boss 110 and the movable portion 300 jointly limit the axial position of the elastic member 400, ensuring normal axial deformation of the elastic member 400. Optionally, the abutment boss 110 can be an entire annular structure and connected to the inner wall of the air duct 100 by welding, integral molding, or other methods.

[0062] Alternatively, as Figure 2 and Figure 5 As shown, the outer wall of the abutment boss 110 extends in the direction from the abutment boss 110 to the movable portion 300 to form a limiting wall 120. One end of the elastic member 400 is mounted on the limiting wall 120. The limiting wall 120 and the inner wall of the air duct 100 jointly limit the radial position of the elastic member 400. By radially limiting the elastic member 400, it is possible to prevent the elastic member 400 from moving too much in the radial direction, thereby preventing it from providing the driving force for the movable portion 300 to move toward the first position in the second state. Optionally, the limiting wall 120 can be an entire cylindrical structure and can be connected to the abutment boss 110 by welding, integral molding, or other methods.

[0063] Alternatively, as Figure 5As shown, the outer edge of the movable portion 300 extends from the movable portion 300 to the abutting boss 110 to form a stop wall. The movable portion 300 can move toward the abutting boss 110 until the movable portion 300 is in the second position. In the second position, the stop wall abuts against the abutting boss 110. The stop wall can both limit the distance the movable portion 300 can leave the first position and, under the action of an external force, firmly stop the movable portion 300 in the second position, preventing the movable portion 300 from shaking when the air intake device 10 has an excessively high air intake velocity. This facilitates the elastic member 400 providing the driving force to the movable portion 300 toward the first position in the second state. Optionally, the stop wall can be cylindrical in structure and can be connected to the movable portion 300 by welding, integral molding, or other methods.

[0064] Specifically in some embodiments of the present invention, such as Figure 5 As shown, in the second state, the elastic member 400 is compressed. It is understandable that the air duct 100 also has a second air duct 100b opposite to the first air duct 100a. Then, when the abutting boss 110 is formed in the air duct 100, the movable part 300 is exposed at the first air duct 100a, while the abutting boss 110 is located between the second air duct 100b and the movable part 300 and is not exposed at the second air duct 100b. In this way, an external force can be smoothly applied to the movable part 300 without increasing the radial dimensions of the movable part 300 and the air duct 100. For example, the suction port 20 of the vacuum cleaner is directly inserted into the movable part 300. In addition, there is no need to adopt any connection measures, such as welding, to connect the elastic member 400 to the movable part 300 and the abutting boss 110, so that in the second state, the elastic member 400 can effectively provide the movable part 300 with a driving force to move toward the first position.

[0065] Of course, in other embodiments, if there is no requirement on the radial dimensions of the air duct 100 and the movable part 300, such as Figure 8 As shown, in the second state, the elastic member 400 is stretched. Figure 8 It can be seen that in order to enable the external force to be applied to the movable part 300 smoothly, for example, the suction port 20 of the vacuum cleaner is directly inserted into the movable part 300, and there must be a sufficient radial distance between the abutting boss 110 and the fixed part 200. For example, the distance is greater than or equal to the wall thickness of the suction port 20; in addition, the elastic member 400 must also be connected to the abutting boss 110 and the movable part 300. It should be noted that the elastic member 400 has an inner cavity extending along the movement direction of the movable part 300, and the suction port 20 of the vacuum cleaner can pass through the inner cavity of the elastic member 400 to directly act on the movable part 300, and there is a gap between the suction port 20 of the vacuum cleaner and the inner wall of the elastic member 400 to avoid interference between the two. In addition, as Figure 8As shown, the abutting boss 110 and the fixing portion 200 are sequentially distributed along the direction from the first position to the second position and there is a sufficient gap between the two in this direction to accommodate the elastic member 400 when the movable portion 300 is in the first position to close the first air outlet 100a.

[0066] Optionally, the elastic member 400 may be a spring. Such elastic members 400 are readily available and have good elastic deformation capabilities. The spring may be a compression spring or a tension spring. The specific type of spring may be selected based on application needs.

[0067] Another embodiment of the present invention provides a power system having an air intake passage, and the power system includes the air intake device 10 as described above, and the air intake device 10 is used to open or close the air intake passage.

[0068] As an example, the power system may be an air compressor, a pneumatic generator, a knocking device, or other device that uses gas as a power source.

[0069] As for the power system above, when the air intake device 10 is not ventilating, the movable part 300 can be located in the first position, and in the first position, the movable part 300 surrounds the fixed part 200 and its own inner annular surface 300a is in contact with the outer annular surface 200a of the fixed part 200, so that the first air outlet 100a is in a closed state, the air duct 100 is closed, and dust is prevented from falling in the air duct 100; when the air intake device 10 is ventilating, the movable part 300 can leave the first position to form a gap with the fixed part 200 in the length direction of the air duct 100, so that the first air outlet 100a is in an open state, so that the air duct 100 is open, so that the open and closed states of the air duct 100 can be freely selected according to needs, thereby opening or closing the air intake channel of the power system.

[0070] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An air inlet device, characterized in that: The air inlet device (10) comprises: an air duct (100), a fixed portion (200) and a movable portion (300); the air duct (100) has a first air outlet (100a); the fixed portion (200) is arranged at the first air outlet (100a); the movable portion (300) is movably arranged in the air duct (100); and the area from the center to the outer edge of the movable portion (300) is equal to the area of ​​the first air outlet (100a); The air duct (100) has two states, namely a first state and a second state. In the first state, the movable part is located at a first position. In the first position, the movable part (300) surrounds the fixed part (200) and the inner annular surface (300a) of the movable part (300) is in contact with the outer annular surface (200a) of the fixed part (200), so that the first air outlet (100a) is in a closed state. In the second state, the movable part (300) forms a gap with the fixed part (200) along the length direction of the air duct (100), so that the first air outlet (100a) is in an open state. The inner annular surface (300a) of the movable part (300) extends radially along the air duct (100) to form a lap boss (320); when the air duct (100) is in the first state, the upper surface of the lap boss (320) is tightly fitted with the lower surface of the fixed part (200) to seal the gap between the fixed part (200) and the movable part (300).

2. The air inlet device according to claim 1, characterized in that: The air inlet device (10) further comprises an elastic member (400) disposed in the air duct (100); in the second state, the elastic member (400) is used to provide a driving force for the movable part (300) to move toward the first position; In the second state, the elastic member (400) is compressed.

3. The air inlet device according to claim 2, characterized in that: The inner wall of the air duct (100) extends radially to form abutting boss (110), and the elastic member (400) is arranged between the abutting boss (110) and the movable part (300).

4. The air inlet device according to claim 3, characterized in that: The outer wall of the abutting boss (110) extends in a direction from the abutting boss (110) to the movable part (300) to form a limiting wall (120), one end of the elastic member (400) is sleeved on the limiting wall (120), and the limiting wall (120) and the inner wall of the air duct (100) jointly limit the radial position of the elastic member (400).

5. The air inlet device according to claim 3, characterized in that: The outer edge of the movable part (300) extends in a direction from the movable part (300) to the abutting boss (110) to form a stop wall (330), and the movable part (300) can move toward the abutting boss (110) until the movable part (300) is located in a second position. In the second position, the stop wall (330) abuts against the abutting boss (110).

6. The air inlet device according to claim 5, characterized in that: The distance between the inner annular surface (300a) of the movable part (300) and the axis of the air duct (100) gradually decreases in the direction from the first position to the second position, and the outer annular surface (200a) of the fixed part (200) is adapted to the inner annular surface (300a) of the movable part (300).

7. The air inlet device according to any one of claims 1 to 5, characterized in that: The air inlet device (10) further comprises a connecting portion (500) and a supporting portion (600), wherein the connecting portion (500) is connected to the inner wall of the air duct (100) and the supporting portion (600), wherein the connecting portion (500) is a hollow structure to allow airflow in the air duct (100) to pass through, and the supporting portion (600) is used to support the fixing portion (200) at the first air outlet (100a).

8. The air inlet device according to claim 7, characterized in that: The connecting portion (500) comprises a plurality of connecting ridges (510), and the connecting ridges (510) are distributed at intervals along the circumference of the air duct (100).

9. The air inlet device according to claim 8, characterized in that: The number of the connecting edges (510) is three, and the connecting edges (510) are evenly distributed along the circumference of the air duct (100).

10. The air inlet device according to claim 1, characterized in that: The air duct (100) is further provided with a second air outlet (100b), and the area of ​​the second air outlet (100b) increases from small to large along the gas flow direction.

11. The air inlet device according to claim 1, characterized in that: The windward area of ​​the fixed part (200) is equal to the cross-sectional area of ​​the movable part (300).

12. A power system, characterized in that: The power source of the power system is gas, the power system has an air intake channel, and the power system includes an air intake device (10) according to any one of claims 1 to 11, and the air intake device (10) is used to open or close the air intake channel to allow gas to enter the power system.

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