Blowing device

Abstract

The present invention discloses an air blowing device, which controls the opening and closing state of the air pressure balance port through an actuator, and a driving mechanism drives the piston to extend and retract in the piston cavity, so that the valve core opens or closes the air outlet channel under the action of the pressure difference between the inside and outside of the air pressure balance channel and the reset member, thereby realizing the inflation operation of the inflatable equipment and the intermittent dust removal operation. During dust removal and inflation, the air pressure balance port is opened to achieve the effect of boosting, which can efficiently remove dust and increase the inflation flow rate. The user can select the operation mode according to needs. The device has diverse functions, a simple structure, and is relatively convenient to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of dust removal equipment, in particular to an air blowing device. Background Art

[0002] To facilitate the inflation of inflatable equipment (such as tires), people generally use air pumps. Conventional air pumps require manual operation, are labor-intensive, and have low inflation efficiency. To improve inflation efficiency, electric air pumps have appeared on the market. These generally include a motor, transmission gears, and a piston assembly. The rotation of the motor drives the reciprocating motion of the piston through the transmission gear. During inflation, the motor pulls the piston rod out of the cylinder via the transmission gear, and the piston valve is pushed open by atmospheric pressure, allowing gas to enter the cylinder. When the motor pushes the piston rod into the cylinder via the transmission gear, the piston valve closes, and gas enters the tire through the cylinder. The function is relatively simple. If used for dust removal, the dust removal effect is poor due to the low pressure. Summary of the Invention

[0003] In view of the above analysis, the blowing device proposed in the present invention is designed to address the deficiencies of the prior art.

[0004] The present invention is mainly achieved through the following technical solutions:

[0005] The blowing device provided by the present invention comprises:

[0006] The housing is provided with a piston chamber, an air storage chamber, and an air outlet channel;

[0007] a piston slidingly fitted in the piston cavity;

[0008] A driving mechanism, mounted on the housing and connected to the piston, for driving the piston to move;

[0009] a valve seat, disposed on the housing, on which an air pressure balancing channel is provided, wherein an air inlet end of the air pressure balancing channel is provided with a first opening, and an air outlet end of the air pressure balancing channel is provided with an air pressure balancing port;

[0010] A valve core is movably disposed on the air pressure balance channel and is provided with a reset member between the valve core and the valve seat. The valve core has a first blocking surface and a second blocking surface. The first blocking surface cooperates to open or block the air inlet of the air outlet channel, and the area of ​​the first blocking surface is larger than the area of ​​the air inlet end of the air outlet channel. The second blocking surface cooperates to open or block the first opening. A gap is formed between the valve core and the inner wall of the air pressure balance channel.

[0011] An actuator is provided in conjunction with the air pressure balance port and is used to open or close the air pressure balance port;

[0012] When the second sealing surface of the valve core is fitted and abutted against the first opening, there is a gap between the first sealing surface of the valve core and the air inlet of the air outlet channel, and the air storage chamber is connected to the air outlet channel; when the first sealing surface of the valve core is fitted and abutted against the air inlet of the air outlet channel, there is a gap between the second sealing surface of the valve core and the first opening, and the air storage chamber is connected to the air pressure balance channel.

[0013] Furthermore, the driving mechanism includes a driving motor and a transmission assembly, and the piston is connected to the output shaft of the driving motor through the transmission assembly.

[0014] Furthermore, the transmission assembly includes a driving gear and a driven gear, the driving gear is mounted on the output shaft of the driving motor, the driven gear is rotatably mounted on the housing and meshes with the driving gear, an eccentric shaft is provided on the driven gear, and the rod of the piston is rotatably mounted on the eccentric shaft.

[0015] Furthermore, the valve core includes a valve column and a valve cap installed on the valve column. The valve column is at least partially slidably installed in the air pressure balance channel and has the gap. The valve cap is placed outside the first opening and has a first sealing surface opposite to the air inlet of the air outlet channel and a second sealing surface opposite to the first opening.

[0016] Furthermore, an air outlet is provided on the piston cavity, and a first valve plate located outside the piston cavity is provided on the air outlet.

[0017] Furthermore, the second valve plate of the piston is provided with an air inlet hole connected with the air inlet end of the air outlet hole.

[0018] Furthermore, the actuator is a solenoid valve.

[0019] Furthermore, when the piston and the piston cavity are completely sealed, the central axis of the piston cavity intersects the central axis of the eccentric shaft perpendicularly, and the central axis of the driven gear shaft is located on the left side of the central axis of the piston cavity.

[0020] Furthermore, a control panel is mounted on the housing, a key switch is provided on the control panel, and the control panel is connected to the actuator and the driving mechanism respectively.

[0021] Furthermore, the shell includes an end shell and a cover shell, the piston chamber is arranged in the end shell, and a second opening for the piston to pass through is provided on the end shell, the valve seat is installed in the end shell, the actuator and the drive mechanism are installed outside the end shell, the air outlet channel is arranged in the cover shell, and the cover shell and the end shell are assembled to form an air storage chamber.

[0022] Furthermore, it also includes a cylinder and an end cap. The end shell is also provided with an annular wall coaxially arranged on the outside of the second opening. One end of the cylinder is sealed on the annular wall, and the end cap is sealed on the other end of the cylinder. The piston slides in the cylinder and is arranged opposite to the end cap.

[0023] Compared with the prior art, the beneficial effects of the technical solution of the present invention are as follows:

[0024] The blowing device provided by the present invention controls the opening and closing state of the air pressure balance port through an actuator, and the driving mechanism drives the piston to extend and retract in the piston cavity, so that the valve core opens or closes the air outlet channel under the action of the pressure difference between the inside and outside of the air pressure balance channel and the reset member, thereby realizing the inflation operation of the inflatable equipment and intermittent dust removal operation. During dust removal and inflation, the air pressure balance port is opened to achieve the effect of boosting, which can efficiently remove dust and increase the inflation flow rate. The user can select the corresponding operation mode according to needs. It has diverse functions, simple structure, and more convenient operation. Intermittent dust removal can reduce the consumption of electric energy.

[0025] Due to the action of the reset member, the first blocking surface of the valve core remains against the air inlet of the air outlet channel. In the inflation mode, the actuator opens the air pressure balance port, and the piston fills the external air into the air storage chamber through the piston chamber. A small amount of gas in the air storage chamber enters the air pressure balance channel through the gap and is discharged from the air pressure balance port. As the air pressure in the air storage chamber increases, the edge of the first blocking surface of the valve core is squeezed and moved under the action of the air pressure, leaving the air inlet of the air outlet channel, and the gas in the air storage chamber is discharged from the air outlet channel. The second blocking surface blocks the first opening. At this time, the reset member is in a compressed state. When the driving mechanism stops pumping air, the air pressure in the air storage chamber decreases. When the air pressure is less than the elastic force of the elastic member, the first blocking surface resumes to block the air inlet of the air outlet channel. In the dust removal mode, the actuator is controlled to switch between the open state and the closed state according to the set time. The piston fills the external gas into the air storage chamber through the piston chamber. When the actuator is opened, the gas is discharged from the air outlet of the air outlet channel. When the actuator is closed, since the gas cannot be discharged from the air pressure balance port, under the joint action of the reset member and the gas in the air pressure balance channel, the valve core is squeezed and moved to block the air inlet of the air outlet channel. The gas cannot be discharged from the air outlet channel, thereby achieving intermittent dust removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 11 is a schematic structural diagram of the blowing device provided by an embodiment of the present invention when blowing;

[0028] Figure 2 This is a schematic structural diagram of the air blowing device provided by an embodiment of the present invention during air extraction;

[0029] Figure 3 yes Figure 1 sectional view of

[0030] Figure 4 is a partially exploded schematic diagram of an air blowing device provided by an embodiment of the present invention;

[0031] Figure 5 1 is a state diagram of four positions of the piston in the blowing device provided by an embodiment of the present invention.

[0032] The reference numerals are as follows:

[0033] 1. Shell, 1a. Piston chamber, 1b. Air storage chamber, 1c. Air outlet channel, 1d. Air outlet hole, 11. End shell, 11a. Second opening, 11b. Annular wall, 12. Cover shell, 2. Piston, 21. Second valve disc, 21a. Air inlet hole, 3. Driving mechanism, 31. Driving motor, 32. Transmission assembly, 321. Driving gear, 322. Driven gear, 323. Eccentric shaft, 4. Valve seat, 4a. Air pressure balance channel, 4b. First opening, 4c. Air pressure balance port, 5. Valve core, 5a. First sealing surface, 5b. Second sealing surface, 51. Valve column, 52. Valve cap, 6. Actuator, 7. First valve disc, 8. Control board, 9. Push button switch, 10. Reset member, 13. Cylinder, 14. End cap. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the present invention, thereby making a clearer definition of the scope of protection of the present invention, the present invention is described in detail below with respect to certain specific embodiments of the present invention. It should be noted that the following are only certain specific embodiments of the present invention, which are only part of the embodiments of the present invention, wherein the specific and direct description of the relevant structures is only for the convenience of understanding the present invention, and each specific feature does not naturally and directly limit the scope of implementation of the present invention. Conventional selections and replacements made by those skilled in the art under the guidance of the present invention should all be deemed to be within the scope of protection of the present invention.

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] Example 1

[0037] like Figure 1-4As shown, the present invention provides an air blowing device, which includes: a housing 1, provided with a piston chamber 1a, an air storage chamber 1b, and an air outlet channel 1c; a piston 2, slidingly fitted in the piston chamber 1a; a driving mechanism 3, mounted on the housing 1 and connected to the piston 2, for driving the piston 2 to move; a valve seat 4, disposed on the housing 1, provided with an air pressure balance channel 4a, an air inlet end of the air pressure balance channel 4a provided with a first opening 4b, and an air outlet end of the air pressure balance channel 4a provided with an air pressure balance port 4c; a valve core 5, movably disposed at the air pressure balance channel 1a. A reset member 10 is provided on the balancing channel 4a and between the valve seat 4. The valve core 5 has a first sealing surface 5a and a second sealing surface 5b. The first sealing surface 5a cooperates to open or block the air inlet of the air outlet channel 1c, and the area of ​​the first sealing surface 5a is larger than the area of ​​the air inlet end of the air outlet channel 1c. The second sealing surface 5b cooperates to open or block the first opening 4b. There is a gap between the valve core 5 and the inner wall of the air pressure balancing channel 4a; the actuator 6 is provided in the air pressure balancing port 4c, and is used to open or close the air pressure balancing port 4c.

[0038] When the second sealing surface 5b of the valve core 5 is fitted and abutted against the first opening 4b, there is a gap between the first sealing surface 5a of the valve core 5 and the air inlet of the air outlet channel 1c, and the air storage chamber 1b is connected to the air outlet channel 1c; when the first sealing surface 5a of the valve core 5 is fitted and abutted against the air inlet of the air outlet channel 1c, there is a gap between the second sealing surface 5b of the valve core 5 and the first opening 4b, and the air storage chamber 1b is connected to the air pressure balance channel 4a.

[0039] In the inflation mode, the actuator 6 opens the air pressure balance port 4c to achieve the inflation operation. In the dust removal mode, the actuator 6 switches between opening and closing the air pressure balance port 4c, and the valve core 5 switches between opening and closing the air inlet of the air outlet channel 1c to achieve intermittent dust removal.

[0040] In this embodiment, the actuator 6 is a solenoid valve, which facilitates intermittent dust removal control according to the set pulse signal, resulting in high instantaneous air pressure and better dust removal effect. The magnet of the solenoid valve is controlled by powering on and off to attract and release it, making it close to or away from the air pressure balance port 4c.

[0041] In this embodiment, the valve seat 4 is positioned opposite the outlet passage 1c. A cavity is defined within the valve core 5. The reset element 10 is housed within the cavity and abuts against the inner wall where the pressure-balancing port 4c is located. This reduces air leakage when the external force applied to the first sealing surface 5a is no greater than the elastic force of the reset element 10. The reset element 10 is a spring, and its elastic force allows it to press against the inlet of the outlet passage 1c and be easily opened by the air pressure within the air storage chamber 1b.

[0042] To facilitate installation and disassembly, specifically, the housing 1 includes an end shell 11 and a cover shell 12, the piston chamber 1a is arranged in the end shell 11, and a second opening 11a for the piston 2 to pass through is provided on the end shell 11, the valve seat 4 is installed in the end shell 11, the actuator 6 and the drive mechanism 3 are installed outside the end shell 11, the air outlet channel 1c is arranged in the cover shell 12, and the cover shell 12 and the end shell 11 are assembled to form an air storage chamber 1b.

[0043] In this embodiment, the end shell 11 and cover shell 12 are connected by snap-fit, snap-fit, or plug-in connection, and then secured with screws. A sealing ring is provided between the end shell 11 and cover shell 12 to improve the sealing performance of the blowing device, enhance blowing efficiency, and increase airflow velocity. The air pressure balancing port 4c is located on the end wall of the end shell 11, and the outlet of the air outlet channel 1c is located on the end wall of the cover shell 12.

[0044] Specifically, a control panel 8 is mounted on the housing 1 , and a key switch 9 is provided on the control panel 8 . The control panel 8 is connected to the actuator 6 and the driving mechanism 3 respectively.

[0045] Different modes are controlled by corresponding key switches 9, and an indicator light is provided on the control panel 8 to indicate the working status of the blowing device.

[0046] Preferably, the drive mechanism 3 includes a drive motor 31 and a transmission assembly 32, and the piston 2 is connected to the output shaft of the drive motor 31 through the transmission assembly 32. When the drive motor 31 rotates, the transmission assembly 32 drives the piston 2 to expand and contract within the piston chamber 1a, thereby achieving rapid air extraction and inflation.

[0047] Specifically, the transmission assembly 32 includes a driving gear 321 and a driven gear 322. The driving gear 321 is installed on the output shaft of the drive motor 31. The driven gear 322 is rotatably installed on the housing 1 and meshes with the driving gear 321. The driven gear 322 is provided with an eccentric shaft 323, and the rod of the piston 2 is rotatably installed on the eccentric shaft 323.

[0048] In this embodiment, a rotating shaft is provided on the housing 1, a first bearing is provided between the top of the rotating shaft and the driven gear 322, and a second bearing is provided between the top of the eccentric shaft 323 and the rod of the piston 2, so that the torque between the rod of the piston 2 and the driven gear 322 is small, thereby reducing the torque generated during the working process and reducing losses.

[0049] Preferably, the valve core 5 includes a valve column 51 and a valve cap 52 installed on the valve column 51. The valve column 51 is at least partially slidably installed in the air pressure balance channel 4a and has the above-mentioned gap. The valve cap 52 is placed outside the first opening 4b and has a first sealing surface 5a opposite to the air inlet of the air outlet channel 1c, and a second sealing surface 5b opposite to the first opening 4b.

[0050] The valve core 5 is arranged between the valve seat 4 and the air outlet channel 1c, and the moving direction of the valve core 5 is guided by the valve seat 4. The valve column 51 is arranged in the valve seat 4 and has a gap, which can realize the connection between the piston chamber 1a and the external atmosphere through the air pressure balance channel 4a, thereby controlling the position of the valve core 5. When the air pressure balance port 4c is opened or closed, the second sealing surface 5b abuts against the first opening 4b to open the air outlet channel 1c, or the first sealing surface 5a abuts against the air inlet of the air outlet channel 1c to close the air outlet channel 1c. The structural design is more reliable and the control is easier.

[0051] The area of ​​the first blocking surface 5a is larger than the area of ​​the air inlet end of the air outlet channel 1c. When the air pressure balance port 4c is opened, when there is a certain air pressure in the air storage chamber 1b, a certain pressure is formed on the part of the first blocking surface 5a exposed outside the air inlet end of the air outlet channel 1c, and the valve core 5 can be opened quickly to facilitate the rapid passage of gas through the air outlet channel 1c.

[0052] In this embodiment, the first blocking surface 5a is circular, and the air inlet end surface of the air outlet channel 1c is annular, which is evenly stressed, facilitates better fitting, and avoids air leakage.

[0053] In this embodiment, the valve stem 51 and the valve cap 52 can be provided separately or integrally, the valve seat 4 is provided integrally with the end shell 11 , and the air pressure balance port 4 c is provided on the side wall of the shell 1 .

[0054] Specifically, an air outlet 1d is provided on the piston chamber 1a, and a first valve plate 7 located outside the piston chamber 1a is provided on the air outlet 1d.

[0055] The piston 2 compresses the piston chamber 1a, and the first valve plate 7 opens the air outlet 1d, connecting the piston chamber 1a with the air storage chamber 1b. When the piston 2 degasses, the first valve plate 7 closes the air outlet 1d, blocking the piston chamber 1a from the air storage chamber 1b.

[0056] In this embodiment, the air outlet holes 1d are distributed at intervals along the circumferential direction.

[0057] An air pressure detection element is also provided in the shell 1. In the inflation mode, when the air pressure detection element detects that the air pressure in the air storage chamber 1b reaches the air pressure threshold, the control board 8 controls the driving mechanism 3 to stop working and closes the actuator 6 to prevent it from working. When the air pressure is lower than the air pressure threshold, the driving mechanism 3 is started again and the actuator 6 is opened to prevent the shell 1 from shaking due to excessive air pressure.

[0058] The blowing device is also equipped with an external mechanical switch to control the drive motor 31. When operating in intermittent dust removal mode, the mechanical switch will not stop working because the air pressure in the air storage chamber 1b reaches the air pressure threshold. Only when the air pressure is greater than 87psi will the drive motor 31 stop working. The control switch needs to be reconnected to start the drive motor 31 for intermittent dust removal to protect the blowing device.

[0059] In the intermittent dust removal mode, the dust blowing mode light is on, and the mechanical switch is closed to control the drive motor 31 to work, and control the working state of the actuator 6. Specifically, it is energized for 2s, and then de-energized for 0.2s, and works reciprocatingly. When the actuator 6 is in the de-energized state, the air pressure balance port 4c is closed, and a sealed environment is formed in the air storage chamber 1b. Since the air outlet 1d is closed when the piston 2 is pumping air, the piston 2 fills the external air into the air storage chamber 1b through the piston chamber 1a through the air inlet 2a. The pumping operation of the piston 2 has no effect on the amount of gas in the air storage chamber 1b. As the piston 2 continues to inflate the air storage chamber 1b, the air pressure in the air storage chamber 1b increases instantly. When the actuator 6 is energized, the high-pressure gas is quickly ejected from the air outlet of the air outlet channel 1c to achieve the dust blowing effect, which can significantly improve the blowing efficiency.

[0060] Specifically, the second valve plate 21 of the piston 2 is provided with an air inlet 21 a connected to the air inlet end of the air outlet 1 d .

[0061] The second valve disc 21 is a rubber cup with an inclined edge. As the driven gear 322 pulls and pushes the piston 2 rod, the piston 2 rod is completely sealed except for two positions (A and C) along the centerline of the piston chamber a. The rest of the time, it is in an inclined state. As the driven gear 322 rotates and pulls the piston 2 rod, the rubber cup contracts and one side of its edge is squeezed and deformed. The air inlet 21a of the rubber cup also opens, allowing external air to enter the piston chamber 1a. The tilt angle then slowly increases and then slowly decreases until the piston 2 rod approaches the second opening 11a. When the driven gear 322 pushes the piston 2 rod, the rubber cup expands and the other side of its edge is squeezed and deformed, closing the air inlet 21a. The tilt angle then slowly increases and then slowly decreases until the rubber cup approaches the air outlet 1d and is finally completely sealed from the piston chamber 1a.

[0062] like Figure 5 As shown, to prevent air leakage, in this embodiment, the central axis of the piston 2 when in positions A and C coincides, and the angles between this central axis and the central axis of the piston 2 when in positions B and D, respectively, are smaller than the inclination angle of the rubber cup edge when the piston 2 is in positions A and C. For ease of illustration, the arcuate hole at the eccentric shaft 323 on the driven gear 322 is omitted.

[0063] In this embodiment, when the piston 2 is completely sealed from the piston chamber 1a (i.e., positions A and C), the central axis E of the piston chamber 1a intersects perpendicularly with the central axis of the eccentric shaft 323, and the central axis of the driven gear 322's shaft is located to the left of the central axis of the piston chamber 1a. This reduces air leakage during piston 2 movement and increases outlet pressure. Point F is the center of the upper end face of the driven gear 322's shaft, and the central axis of the driven gear 322's shaft passes through point F.

[0064] Preferably, it further includes a cylinder 13 and an end cap 14. The end shell 11 is also provided with an annular wall 11b coaxially arranged next to the second opening 11a. One end of the cylinder 13 is sealed on the annular wall 11b, and the end cap 14 is sealed on the other end of the cylinder 13. The piston 2 slides in the cylinder 13 and is arranged opposite to the end cap 14.

[0065] In this embodiment, the annular wall 11b is integrally formed with the end shell 11. The air outlet 1d is provided on the end cap 14. A boss is provided on the outer end wall of the end cap 14. The first valve disc 7 is mounted on the boss and is arranged in close contact with the air outlet 1d.

[0066] In this embodiment, sealing rings are respectively provided between the cylinder 13 and the end cap 14 and the annular wall 11b to further improve the sealing performance of the air storage chamber 1b, so that all the gas in the piston chamber 1a enters the air storage chamber 1b from the air outlet 1d to avoid air leakage.

[0067] In order to improve the structural strength of the piston chamber 1a and ensure the reliability of the piston 2 during inflation and degassing, the cylinder 13 is respectively connected to the end cap 14 and the annular wall 11b by welding or screws.

[0068] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A blowing device, characterized in that, The blowing device comprises: The housing (1) is provided with a piston chamber (1a), an air storage chamber (1b), and an air outlet passage (1c); A piston (2) slidingly fitted in the piston chamber (1a); a driving mechanism (3), mounted on the housing (1) and connected to the piston (2), for driving the piston (2) to move; A valve seat (4) is provided on the housing (1), and is provided with an air pressure balancing channel (4a). The air inlet end of the air pressure balancing channel (4a) is provided with a first opening (4b), and the air outlet end of the air pressure balancing channel (4a) is provided with an air pressure balancing port (4c); A valve core (5) is movably arranged on the air pressure balance channel (4a), and a reset member (10) is provided between the valve core (5) and the valve seat (4); the valve core (5) has a first blocking surface (5a) and a second blocking surface (5b); the first blocking surface (5a) cooperates to open or block the air inlet of the air outlet channel (1c), and the area of ​​the first blocking surface (5a) is larger than the area of ​​the air inlet end of the air outlet channel (1c); the second blocking surface (5b) cooperates to open or block the first opening (4b); a gap exists between the valve core (5) and the inner wall of the air pressure balance channel (4a); An actuator (6) is provided in cooperation with the air pressure balance port (4c) and is used to open or close the air pressure balance port (4c); When the second blocking surface (5b) of the valve core (5) is mated against the first opening (4b), a gap exists between the first blocking surface (5a) of the valve core (5) and the air inlet of the air outlet channel (1c), and the air storage chamber (1b) is connected to the air outlet channel (1c); when the first blocking surface (5a) of the valve core (5) is mated against the air inlet of the air outlet channel (1c), a gap exists between the second blocking surface (5b) of the valve core (5) and the first opening (4b), and the air storage chamber (1b) is connected to the air pressure balance channel (4a).

2. The blowing device according to claim 1, wherein: The driving mechanism (3) comprises a driving motor (31) and a transmission assembly (32), and the piston (2) is connected to the output shaft of the driving motor (31) through the transmission assembly (32).

3. The blowing device according to claim 2, wherein: The transmission assembly (32) comprises a driving gear (321) and a driven gear (322), wherein the driving gear (321) is mounted on the output shaft of the driving motor (31), and the driven gear (322) is rotatably mounted on the housing (1) and meshes with the driving gear (321). An eccentric shaft (323) is provided on the driven gear (322), and the rod of the piston (2) is rotatably mounted on the eccentric shaft (323).

4. The air blowing device according to claim 1, wherein: The valve core (5) includes a valve column (51) and a valve cap (52) mounted on the valve column (51); the valve column (51) is at least partially slidably mounted in the air pressure balance channel (4a) and has the gap; the valve cap (52) is placed outside the first opening (4b) and has a first blocking surface (5a) opposite to the air inlet of the air outlet channel (1c), and a second blocking surface (5b) opposite to the first opening (4b).

5. The air blowing device according to claim 1, wherein: An air outlet (1d) is provided on the piston chamber (1a), and a first valve plate (7) located outside the piston chamber (1a) is provided on the air outlet (1d).

6. The air blowing device according to claim 5, wherein: The second valve plate (21) of the piston (2) is provided with an air inlet hole (21a) which is in communication with the air inlet end of the air outlet hole (1d).

7. The air blowing device according to claim 1, wherein: The actuator (6) is a solenoid valve.

8. The air blowing device according to claim 3, wherein: When the piston (2) and the piston chamber (1a) are completely sealed, the central axis of the piston chamber (1a) intersects perpendicularly with the central axis of the eccentric shaft (323), and the central axis of the rotating shaft of the driven gear (322) is located to the left of the central axis of the piston chamber (1a).

9. The blowing device according to any one of claims 1, 5-6, characterized in that: The housing (1) includes an end shell (11) and a cover shell (12); the piston chamber (1a) is arranged in the end shell (11), and a second opening (11a) for the piston (2) to pass through is provided on the end shell (11); the valve seat (4) is installed in the end shell (11); the actuator (6) and the drive mechanism (3) are installed outside the end shell (11); the air outlet channel (1c) is arranged in the cover shell (12); the cover shell (12) and the end shell (11) are assembled together to form an air storage chamber (1b).

10. The air blowing device according to claim 9, wherein: The invention also includes a cylinder (13) and an end cap (14). An annular wall (11b) coaxially arranged outside the second opening (11a) is provided in the end shell (11). One end of the cylinder (13) is sealed on the annular wall (11b), and the end cap (14) is sealed on the other end of the cylinder (13). The piston (2) is slidably fitted in the cylinder (13) and is arranged opposite to the end cap (14).

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