Air pump

Abstract

The utility model provides an air pump. The air pump comprises a shell assembly, a pump body assembly and a self-locking device. The shell assembly comprises a cylindrical shell and an upper cover, an air inlet and outlet hole and a valve assembly penetrating through the air inlet and outlet hole are arranged on the cylindrical shell, and the valve assembly is used for opening and closing the air inlet and outlet hole; the pump body assembly is mounted in the cylindrical shell in a manner of moving up and down, and self-locking fixation and unlocking separation between the pump body assembly and the cylindrical shell are realized through the self-locking device; meanwhile, the valve assembly moves up and down along with the pump body assembly to open and close the air inlet and outlet; the pump body assembly comprises a pump shell and a power control key arranged on the pump shell, and the pump body assembly moves downwards along the cylindrical shell and can touch the power control key so that the air pump can be started or stopped. The pump body assembly is simple in structure, the size of the air pump can be effectively reduced, the operation is simple when the inflation, deflation and stop functions are switched, and whether the inflation and deflation hole of the air pump is opened or closed does not need to be observed.

Description

Technical Field

[0001] This application belongs to the field of air pumps, and particularly relates to an air pump. Background Art

[0002] At present, inflatable products are more and more widely used, and air pumps are used to connect to inflatable products for inflation and deflation. One type of air pump is an internal and external dual-purpose air pump, which can achieve the functions of inflation and deflation by controlling the commutation structure without changing the direction of the pump body. However, existing air pump products with commutation structures are often complex in structure and large in size, and are not convenient to be used on smaller products such as inflatable pillows. In addition, the current inflatable products are rather cumbersome to operate when switching between inflation, deflation and stop functions, and at the same time, it is necessary to pay attention to observing whether the inflation and deflation ports of the air pump are opened or closed. Summary of the Utility Model

[0003] One of the purposes of this application is to provide an air pump, the pump body assembly of which has a simple structure and can effectively reduce the volume of the air pump, and the operations of switching between inflation, deflation and stop functions are simple, without the need to pay attention to observing whether the inflation and deflation ports of the air pump are opened or closed.

[0004] To achieve the above purpose and other related purposes, this application provides an air pump, which includes a housing assembly, a pump body assembly and a self-locking device;

[0005] The housing assembly includes a cylindrical shell and an upper cover. An air inlet / outlet hole and a valve assembly passing through the air inlet / outlet hole are provided on the cylindrical shell, and the valve assembly is used to open and close the air inlet / outlet hole;

[0006] The pump body assembly is movably installed up and down in the cylindrical shell and realizes self-locking fixation and unlocking detachment between the pump body assembly and the cylindrical shell through the self-locking device; meanwhile, the valve assembly opens and closes the air inlet / outlet hole as the pump body assembly moves up and down; the pump body assembly includes a pump shell and a power control key provided on the pump shell, and when the pump body assembly moves downward along the cylindrical shell, it can touch the power control key to turn on or stop the air pump.

[0007] This application has at least the following beneficial effects:

[0008] By using the air pump of this application, the pump body assembly has a simple structure and can effectively reduce the volume of the air pump, and the operations of switching between inflation, deflation and stop functions are simple, without the need to pay attention to observing whether the inflation and deflation ports of the air pump are opened or closed.

[0009] With the air pump of the present application, the pump body assembly is movably installed up and down in the cylindrical housing, and the self-locking device is used to achieve self-locking fixation and unlocking detachment between the pump body assembly and the cylindrical housing; at the same time, the valve assembly opens and closes the air inlet and outlet holes as the pump body assembly moves up and down; the pump body assembly includes a pump housing and a power control button provided on the pump housing, and the pump body assembly can touch the power control button when moving downward along the cylindrical housing to turn on or stop the air pump.

[0010] With the air charging and discharging structure of the present application, the air charging and discharging structure is installed inside the pump housing and is used to change the air flow direction inside the air charging and discharging structure and inside the pump housing as the impeller rotates, greatly simplifying the structure of the air pump and reducing the volume of the air pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0012] Figure 1 It is an exploded view of the structure of the air pump shown according to an embodiment of the present application;

[0013] Figure 2 is Figure 1 Another exploded view of the structure of the air pump from another angle;

[0014] Figure 3 It is an exploded view of the air pump shown according to an embodiment of the present application;

[0015] Figure 4 It is a sectional view of the exploded structure of the air pump shown according to an embodiment of the present application;

[0016] Figure 5 It is an exploded view of the structure of the pump body assembly shown according to an embodiment of the present application;

[0017] Figure 6 is Figure 5 Another exploded view of the structure of the pump body assembly from another angle;

[0018] Figure 7 is Figure 6 The working principle diagram of the pump body assembly, and the arrow direction shown is the air flow direction when the pump body assembly is inflating;

[0019] Figure 8 is Figure 6 The working principle diagram of the pump body assembly, and the arrow direction shown is the air flow direction when the pump body assembly is deflating;

[0020] Figure 9The figure shows the working principle diagram of the air pump according to an embodiment of the present application. The direction of the arrow shown is the air flow direction for reverse inflation.

[0021] Figure 10 The figure shows the working principle diagram of the air pump according to an embodiment of the present application. The direction of the arrow shown is the air flow direction for forward deflation.

[0022] Reference numerals

[0023] 100 Housing assembly; 10 Cylindrical housing; 11 Upper cover; 13 Valve assembly; 13a Valve body bracket; 13b Valve plate; 14 Hollow guide post; 15 Push rod; 15a Spring; 16 Self-locking mechanism; 17 Protective cover; 18 Power control key; 18a Limit groove; 19 Second air flow channel; 200 Pump body assembly; 200a Upper cover part; 200b Middle cylinder part; 200c Lower cover part; 21 Circuit board; 22 Motor; 23 Vent hole; 24 Second air port; 25 First air flow channel; 26 Power supply; 27 Self-locking buckle; 28 Guide post; 29 Sealing ring; 29a Positioning block; 30 Inflation and deflation structure; 31 Impeller; 33 First impeller cover; 33a First air port; 34b Step; 34b1 Convex part. Detailed implementation manners

[0024] The following describes the implementation manners of the present application through specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. Various details in the present application can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0025] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0026] Referring to Figures 1 to 3 , this embodiment provides an air pump, which includes a housing assembly 100, a pump body assembly 200 and a self-locking device.

[0027] The housing assembly 100 includes a cylindrical housing 10 and an upper cover 11. The cylindrical housing 10 may be provided with overmolding for fixing the cylindrical housing 10 to the inflatable object by means of fusion welding or soldering, etc. An air inlet / outlet hole is provided at the bottom of the cylindrical housing, and a valve assembly 13 is arranged through the air inlet / outlet hole. The valve assembly 13 is used to open and close the air inlet / outlet hole.

[0028] The pump body assembly 200 is movably installed up and down in the cylindrical housing 10 and realizes self-locking fixation and unlocking detachment between the pump body assembly 200 and the cylindrical housing 10 through a self-locking device; meanwhile, the valve assembly 13 opens and closes the air inlet / outlet hole as the pump body assembly 200 moves up and down.

[0029] The pump body assembly 200 includes a pump housing and a power control key 18 arranged on the pump housing. When the pump body assembly 200 moves downward along the cylindrical housing 10, it can touch the power control key 18 to turn on or stop the air pump.

[0030] A plurality of ventilation holes 23 are provided at the top of the pump housing for air inlet and outlet. A cavity is formed inside the pump housing to form a first air flow channel 25. The ventilation holes 23 are communicated with the first air flow channel 25; referring to Figure 4 , a second air flow channel 19 is formed between the bottom of the pump housing and the inner bottom of the cylindrical housing. The second air flow channel 19 is communicated with the air inlet / outlet hole. A sealing ring 29 may be provided on the outer bottom of the pump housing, and the sealing ring 29 is used to seal the second air flow channel 19.

[0031] A motor 22 and an impeller 31 driven by the motor 22 to rotate are arranged in the cavity of the pump housing. The rotation of the impeller 31 can form an inflation air flow or a deflation air flow in the first air flow channel 25.

[0032] Referring to Figure 5 and Figure 6 , the pump body assembly 200 includes an inflation / deflation structure 30 installed inside the pump housing. The inflation / deflation structure 30 includes a first impeller cover 33, an impeller 31, and a second impeller cover arranged in sequence from top to bottom.

[0033] Referring to Figure 7 and Figure 8 , the first impeller cover 33 and the second impeller cover are respectively hermetically connected to the inside of the pump housing. The impeller 31 includes a rotating shaft and blades. On the side of the first impeller cover 33 and the second impeller cover facing the impeller 31, annular bosses are respectively provided. An accommodation space is provided inside the annular bosses for accommodating the rotating shaft of the impeller to rotate in the accommodation space. The position of the annular boss can be set at the connection between the rotating shaft and the blades to restrict the flow of air from the gap between the rotating shaft and the blades. Through the setting of the annular boss, the gap between the impeller 31 and the first impeller cover 33 and the second impeller cover can be increased, thereby increasing the air inflow and outflow volume of the first air port 33a of the first impeller cover 33 and the second air port 24 of the second impeller cover, so that the air can be quickly deflated and inflated when the air flow encounters a step obstacle during forward rotation deflation and reverse rotation inflation.

[0034] In an example of the present application, a motor bracket is provided on the upper end surface of the first impeller cover 33. Specifically, a ring of bosses is provided on the inner wall of the pump housing near the first impeller cover 33, and the bosses are fixedly connected to the motor bracket.

[0035] In some embodiments of the present application, the second impeller cover may be located above the inner bottom of the pump housing. In some other embodiments of the present application, the second impeller cover may also be a part of the bottom of the pump housing.

[0036] The first impeller cover 33 and the second impeller cover can enclose an impeller rotation space. It can be that both the first impeller cover 33 and the second impeller cover form the impeller rotation space, or it can be that the first impeller cover 33, the second impeller cover and the inner peripheral wall of the pump housing surround to form the impeller rotation space. The impeller 31 rotates forward and backward to change the air flow direction in the impeller rotation space.

[0037] The first impeller cover 33 is provided with a first air port 33a, and the first air port 33a is respectively communicated with the first air flow channel 25 and the impeller rotation space; the second impeller cover is provided with a second air port 24, and the second air port 24 is communicated with the impeller rotation space and the second air flow channel 19.

[0038] The included angle between the line connecting the center of the first air port 33a and the impeller rotation axis and the line connecting the center of the second air port 24 and the impeller rotation axis is a predetermined included angle, and the predetermined included angle can be less than 90°. A step 34b is provided on one side of the second impeller cover facing the impeller 31, and the step 34b is used to block and change the air flow direction in the impeller rotation space.

[0039] In some embodiments of the present application, a convex portion 34b1 is provided on the side of the step 34b close to the inner peripheral wall of the pump housing, and the convex portion 34b1 is located between the impeller 31 and the inner peripheral wall of the pump housing. The convex portion 34b1 can block the air flow flowing along the gap between the impeller 31 and the inner peripheral wall of the pump housing. The air flow is blocked by the step 34b and its convex portion 34b1, restricting the air flow direction and driving the air flow to flow quickly and efficiently towards the second air port 24. Refer to Figure 6 , the convex portion 34b1 can be an arc-shaped convex portion.

[0040] In some embodiments of the present application, the projection of the step 34b on the second impeller cover can be a sector, and the radius of the sector faces the impeller rotation axis.

[0041] In some embodiments of the present application, the step 34b is located near the second air port 24. Refer to Figure 7 , when the impeller 31 rotates reversely, the air flow rotating with the impeller 31 is blocked by the step 34b and flows towards the second air port 24. Refer to Figure 8 , when the impeller 31 rotates forward, the air flow rotating with the impeller 31 is blocked by the step 34b and flows towards the first air port 33a.

[0042] Refer toFigure 7 , in some embodiments of the present application, the step 34b partially shields the second air port 24. Further, a groove is provided on the side of the bottom of the step 34b facing the second air port 24 for guiding the air flow into the second air port 24. Refer to Figure 5 and 6 , the step 34b partially shields the second air port 24, such that the second air port 24 is a semi-circular opening, and the area of the semi-circular opening is denoted as S1, and the area enclosed by the projections of two adjacent blades of the impeller 31 and the side wall of the pump body assembly 200 on the bottom of the pump housing is S2. The areas of S1 and S2 are the same or approximately the same, so that the air flow velocity remains stable during the process of entering the second air port 24. In some embodiments of the present application, a step is provided on the side of the first impeller cover 33 facing the impeller 31, and the setting manner of the step is the same as that of the step 34b of the second impeller cover, which will not be elaborated here one by one.

[0043] Refer to Figure 5 and Figure 6 , a convex block similar to the step convex part of the second impeller cover may also be provided on the step of the first impeller cover 33, and a groove is provided on the upper surface of the step convex part of the second impeller cover. The step convex block of the first impeller cover 33 can cooperate with the groove on the upper surface of the step convex part of the second impeller cover. Refer to Figure 4 , in some embodiments of the present application, the motor 22 is installed above the first impeller cover 33, and the rotating shaft of the motor 22 is connected to the impeller 31 below the first impeller cover 33 through an opening in the middle of the first impeller cover 33.

[0044] Refer to Figure 4 , in some embodiments of the present application, the pump body assembly 200 further includes a power source 26 for providing electrical energy for the operation of the motor 22. The power source 26 can be arranged above the first impeller cover 33. The power source 26 can be a battery. In some other embodiments, the air pump is powered by an external power source, and a power interface for connecting to the external power source is provided on the housing assembly 100. Refer to Figure 1 , Figure 3 and Figure 4 , in some embodiments of the present application, a valve assembly 13 that can move up and down relative to the air inlet and outlet holes is provided at the bottom of the cylindrical housing 10, and the valve assembly 13 is used to open and close the air inlet and outlet holes. The valve assembly 13 includes a valve body bracket 13a and a valve flap 13b.

[0045] Refer to Figure 4, inside the bottom of the cylindrical housing 10, a hollow guide post 14 extends upward. The upper end of the hollow guide post 14 is open, and it has a cavity inside. The cavity communicates with the outside of the cylindrical housing 10, and a limiting platform is provided at the upper end opening. Inside the hollow guide post 14, a spring 15a and a push rod 15 are provided. The diameter of the lower end of the push rod 15 is larger than the diameters of the spring 15a and the limiting platform, and it is limited between the spring 15a and the limiting platform. The upper end of the push rod 15 passes through the hollow guide post 14 and abuts against the bottom of the pump housing. The connecting post of the valve body bracket 13a extends into the hollow guide post 14 and is fixedly connected to the lower end of the push rod 15. The spring 15a is sleeved on the outer periphery of the connecting post. When the pump body assembly 200 moves downward, the bottom of the pump housing pushes the push rod 15, causing the valve assembly 13 to move downward and compress the spring 15a at the same time, opening the air inlet and outlet holes. When the bottom of the pump housing rises, the spring 15a returns to its pre-deformed state and pulls the valve assembly 13 upward to close the air inlet and outlet holes. A positioning block 29a can be installed on the outer bottom of the pump housing to fit the push rod 15.

[0046] Referring to Figure 1 , further, a self-locking mechanism 16 is provided on the inner side of the bottom of the cylindrical housing 10, and a self-locking buckle 27 is provided on the outer side of the bottom of the pump housing. The self-locking buckle 27 cooperates with the self-locking mechanism 16. The self-locking mechanism 16 can be a push-type elastic self-locking mechanism or other suitable self-locking mechanisms. The above mechanisms are all prior arts and will not be described in detail here. Pressing the pump body assembly 200 makes the distance between the bottom of the housing and the bottom of the pump housing the smallest, causing the spring 15a to contract and push the valve assembly 13 downward and maintain a predetermined position, thereby keeping the air inlet and outlet holes open; pressing the pump body assembly 200 again makes the distance between the bottom of the housing and the bottom of the pump housing the largest, causing the spring 15a to return to its pre-deformed state and pull the valve assembly 13 upward to close the air inlet and outlet holes and keep the air inlet and outlet holes closed.

[0047] Referring to Figure 1 , Figure 3 and Figure 4 , in some embodiments of the present application, a protective cover 17 is further provided at the bottom of the housing. The protective cover 17 and the bottom of the cylindrical housing 10 form a space for the valve assembly 13 to move up and down.

[0048] The working principle of the air pump is shown below through the embodiments of the present application:

[0049] Referring to Figure 4 , the pump body assembly 200 is arranged inside the housing assembly. In the static state, the self-locking mechanism 16 and the self-locking buckle 27 correspond to each other but do not contact. The pump body assembly 200 does not contact or contacts the push rod 15 but does not apply pressure. The valve assembly 13 fits against the bottom of the housing to close the air inlet and outlet holes. At this time, the first air flow channel 25 inside the pump body and the air flow channel between the second air flow channel 19 inside the housing and the inflatable object are in a blocked state; Referring to Figure 9, during reverse inflation, by pressing the pump body assembly 200, the pump body assembly 200 moves downward, the spring 15a is gradually compressed, the push rod 15 drives the valve assembly 13 to approach the protective cover 17 side, and the self-locking buckle 27 at the bottom of the pump housing interacts with the self-locking mechanism 16 as the pump body assembly 200 moves downward until the two are self-locked and fixed. At this time, the air inlet and outlet holes remain open, and the air flow channels between the first air flow channel 25, the second air flow channel 19 and the inflatable object are connected. The motor 22 operates to drive the impeller 31 to reverse inflate. The outside air passes through the ventilation hole 23 at the top of the pump body assembly 200, via the first air flow channel 25, the first air port 33a of the pump body assembly 200, the second air port 24, then via the second air flow channel 19, and finally enters the inflatable object through the air inlet and outlet holes at the bottom of the cylindrical housing 10; when stopping working, press the pump body assembly 200 again, the pump body assembly 200 moves downward, the self-locking mechanism 16 and the self-locking buckle 27 are unlocked and separated, the elastic force of the spring 15a is released, driving the valve assembly 13 to close the air inlet and outlet holes, and the air flow channel is blocked. At this time, the pump body assembly 200 moves upward and the motor 22 stops working; refer to Figure 10 , during forward deflation, press the pump body assembly 200 again, the pump body assembly 200 moves downward, the spring 15a is gradually compressed, the push rod 15 drives the valve assembly 13 to approach the protective cover 17 side, and the self-locking buckle 27 at the bottom of the pump housing interacts with the self-locking mechanism 16 inside the housing assembly as the pump body assembly 200 moves downward until the two are self-locked and fixed. At this time, the air inlet and outlet holes remain open, and the air flow channels between the first air flow channel 25, the second air flow channel 19 and the inflatable object are connected. The motor 22 operates to drive the impeller 31 to rotate forward for deflation. The gas in the inflatable object passes through the air inlet and outlet holes at the bottom of the cylindrical housing 10, via the second air flow channel 19, the second air port 24 of the pump body assembly 200, the first air port 33a, then via the first air flow channel 25, and finally is discharged from the ventilation hole 23 at the top of the pump body assembly 200.

[0050] Refer to Figure 2 , in some embodiments of the present application, the pump body assembly 200 is a detachable structure, specifically including an upper cover part 200a, a middle cylinder part 200b and a lower cover part 200c connected in sequence from top to bottom. The first air port 33a can be arranged on the upper cover part 200a. The second air port 24 can be arranged on the lower cover part 200c. The middle cylinder part 200b is used to accommodate the impeller 31, the motor 22 and the power supply 26. In some embodiments of the present application, the first impeller cover 33 is located in the middle cylinder part 200b, and the second impeller cover is formed by the bottom of the lower cover part 200c. The middle cylinder part 200b and the lower cover part 200c can be connected by threads. A groove can be arranged at the connection position of the middle cylinder part 200b and the lower cover part 200c for accommodating and limiting the first impeller cover 33.

[0051] Refer to Figure 3, in some embodiments of the present application, a power control key 18 is provided on the outer side wall of the pump housing, which is used to turn on and off the motor 22 to drive the impeller 31 to rotate forward or backward. The power control key 18 can be a mechanical switch or a push-button switch, and can also be a Hall induction switch or a rocker switch. Refer to Figure 1 , a limiting groove 18a that cooperates with the power control key 18 is provided on the inner side wall of the housing assembly. One side of the air pump provided with the power control key 18 is inserted into the cylindrical housing along the limiting groove 18a. At this time, the power control key 18 is located in the limiting groove 18a inside the housing and does not contact the limiting groove 18a. When the pump body assembly 200 moves downward along the cylindrical housing 10, the self-locking buckle 27 and the self-locking mechanism 16 can be self-locked and fixed. The power control key 18 disengages from the limiting groove 18a, and the power control key 18 is pressed by the inner side wall of the cylindrical housing, and the motor 22 starts to drive the impeller 31 to rotate. When the pump body assembly 200 moves upward along the cylindrical housing 10, the self-locking buckle 27 and the self-locking mechanism 16 can be unlocked and disengaged, the power control key 18 moves into the limiting groove 18a, the power control key 18 resets, and the motor 22 stops working.

[0052] A circuit board 21 is provided inside the pump body assembly 200, and the power control key 18 is electrically connected to the circuit board 21.

[0053] Refer to Figure 1 , in some embodiments of the present application, a guiding groove and a guiding post 28 that cooperate with each other are provided on the inner side wall of the housing and the outer side wall of the pump housing, so that when the pump body assembly 200 is installed in the housing assembly, it can be accurately positioned and prevent the pump body assembly 200 from rotating inside the housing assembly, playing a limiting role.

[0054] In some embodiments of the present application, the pump body assembly 200 can be taken out of the housing assembly for external use. The air inlet and outlet of the pump body assembly 200 can be connected to the air inlet nozzle of the inflatable product, and the inflatable product can be inflated or deflated through the air inlet nozzle.

[0055] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present application.

Claims

1. An air pump, characterized in that, It includes a housing assembly, a pump body assembly and a self-locking device; The housing assembly includes a cylindrical housing and an upper cover. An air inlet / outlet hole and a valve assembly penetrating through the air inlet / outlet hole are provided on the cylindrical housing, and the valve assembly is used to open and close the air inlet / outlet hole; The pump body assembly is movably installed up and down in the cylindrical housing and is self-locked and fixed and unlocked and disengaged between the pump body assembly and the cylindrical housing through the self-locking device; meanwhile, the valve assembly opens and closes the air inlet / outlet hole as the pump body assembly moves up and down; the pump body assembly includes a pump housing and a power control button provided on the pump housing. When the pump body assembly moves downward along the cylindrical housing, it can touch the power control button to turn on or stop the air pump.

2. The air pump according to claim 1, wherein A plurality of ventilation holes are provided at the top of the pump housing for air inlet and outlet. A cavity is formed inside the pump housing to form a first air flow channel, and the ventilation holes are communicated with the first air flow channel; a second air flow channel is formed between the bottom of the pump housing and the inner bottom of the cylindrical housing, and the second air flow channel is communicated with the air inlet / outlet hole; The pump body assembly includes a charging and discharging structure installed in the pump housing. The charging and discharging structure includes a first impeller cover provided with a first air port, a second impeller cover provided with a second air port, and an impeller located between the first / second impeller covers and capable of rotating forward and backward; the first impeller cover and the second impeller cover enclose an impeller rotation space, and the forward and backward rotation of the impeller is used to change the air flow direction in the impeller rotation space; the first air port is respectively communicated with the first air flow channel and the impeller rotation space; the second air port is communicated with the impeller rotation space and the second air flow channel.

3. The air pump according to claim 2, characterized in that, An electric motor bracket for supporting the electric motor is provided on the first impeller cover; the second impeller cover is located above the inner bottom of the pump housing or is a part of the bottom of the pump housing.

4. The air pump according to claim 2, wherein The connecting line between the center of the first air port and the impeller rotation axis and the connecting line between the center of the second air port and the impeller rotation axis form a predetermined angle; a step is provided between the first impeller cover and / or the second impeller cover and the impeller within the range of the predetermined angle, and the step is used to block and change the air flow direction in the impeller rotation space.

5. The air pump according to claim 4, characterized in that, A convex portion is provided on one side of the step close to the inner peripheral wall of the pump housing, and the convex portion is located between the impeller and the inner peripheral wall of the pump housing.

6. The air pump according to claim 4, characterized in that, The step partially blocks the air port; a groove communicated with the air port is provided at the bottom of the step, and the groove is used to guide the air flow into the air port.

7. The air pump according to claim 1, characterized in that, The self-locking device includes a self-locking mechanism and a self-locking buckle; the self-locking mechanism is provided on the inner side of the bottom of the cylindrical housing, and the self-locking buckle is provided on the outer side of the bottom of the pump housing, and the self-locking buckle is matched with the self-locking mechanism.

8. The air pump according to claim 1, wherein A power control button is provided on the outer side wall of the pump housing; a motor is provided in the cavity of the pump housing; a limiting groove that cooperates with the power control button is provided on the inner side wall of the housing assembly; when the pump body assembly moves downward along the cylindrical housing, the power control button can be disengaged from the limiting groove, and under the extrusion of the inner side wall of the cylindrical housing, the motor starts to work; when the pump body assembly moves upward along the cylindrical housing, the power control button can be moved into the limiting groove, the power control button is reset, and the motor stops working.

9. The air pump according to claim 1, wherein A hollow guiding column extends upward from the inner side of the bottom of the cylindrical housing. The upper end of the hollow guiding column is open and has a cavity inside; a spring and a push rod that are connected to each other are provided in the hollow guiding column, and the push rod is limited inside the cavity of the hollow guiding column; the upper end of the push rod passes through the hollow guiding column and abuts against the bottom of the pump housing.

10. The air pump according to claim 9, wherein The valve assembly includes a valve body bracket and a valve plate; the valve body bracket includes a connecting column, the connecting column extends into the hollow guiding column and is fixedly connected to the lower end of the push rod, and the spring is sleeved on the outer periphery of the connecting column.

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