TWI896349B - Floor pump with stowable pressure gauge - Google Patents

Abstract

A floor pump with stowable pressure gauge, comprising: a base; a barrel portion provided on the base and projecting upwardly; a concave chamber provided in the barrel portion; a cylinder, a bottom end of the cylinder is disposed in the barrel portion of the base; a piston rod and a piston, which are disposed in a compression space of the cylinder; a pressure gauge having a head and a manifold coupled thereto; a shaft manifold disposed between the base and the cylinder and extends through the chamber; the manifold of the pressure gauge is pivoted on the shaft manifold so that the pressure gauge can be switched between a stowed position and an in-use position. When the pressure gauge is in the stowed position, it overlaps with the base, when the pressure gauge is in the in-use position, it does not overlap with the base.

Description

Floor-standing air pump with storable pressure gauge

The present invention relates to a device for inflating tires. Specifically, it relates to a floor-standing tire pump that can store a tire pressure gauge.

Floor pumps are placed on the ground and can inflate bicycle tires to a greater degree. These pumps are equipped with a pressure gauge, which allows the user to check the inflation pressure.

However, the pressure gauge of conventional floor-standing air pumps is a fixed component that protrudes from the front of the pump, making the pump relatively large and inconvenient to package and transport.

Patent No. M634040, "Floor-Mounted Air Pump," provides an air pump that reduces the volume of the pump during packaging and shipping. The invention provides an air pump comprising a filling device and a base. The filling device includes a pump, a base, and a pressure gauge. The pump extends vertically, the base is connected to the lower vertical edge of the pump, and the pressure gauge is mounted on the pump. The leg is rotatably connected to the base between an extended position and a first collapsed position. The leg is provided with a first footrest and a second footrest. When the leg is in the extended position, neither the first footrest nor the second footrest is vertically below the pressure gauge. When the leg is in the first collapsed position, the first footrest is vertically below the pressure gauge. This structure enables the pump to reduce the volume of material being transported.

While the aforementioned patented method can reduce the packaging volume of floor-standing pumps, its overall structure is relatively complex, and rotating the legs is inconvenient, requiring the pump to be suspended in mid-air. Furthermore, the base's latching ridges and the leg's latching grooves are difficult to engage and disengage, making unfolding and folding the legs laborious and inconvenient.

Furthermore, for floor-standing pumps, the foot of the new patent serves as a component for mounting and stabilizing the pump. However, the prior patent design allows the foot to rotate relative to the pump, resulting in an unstable and structurally weak connection between the foot and the pump. This makes it difficult to withstand the repeated pressure exerted by the operator during the pumping process, becoming a breaking point for the pump and making it susceptible to damage.

One object of the present invention is to provide a floor-standing air pump with a pressure gauge, wherein the pressure gauge of the air pump can be easily and conveniently stored and the pressure gauge can be converted from a stored state to a usable state.

Another object of the present invention is to provide a floor-standing air pump that can accommodate a pressure gauge, wherein the storage structure of the pressure gauge does not affect the structural integrity of the air pump.

The present invention provides a floor-standing air pump capable of storing a pressure gauge, comprising: a base; a cylindrical portion disposed on the base and protruding upward; the base having at least one pedal located on one side of the cylindrical portion; a concave chamber disposed on the circumference of the cylindrical portion; a cylinder having a compression space within it, the bottom end of the cylinder being mounted on the cylindrical portion of the base; a piston rod; a piston disposed at the bottom end of the piston rod; the piston and the bottom end of the piston rod being mounted in the compression space of the cylinder; a pressure gauge having a head portion and a manifold connected to each other, one end of the manifold being a pivot end; a pivot hole disposed at the pivot end of the manifold; a first flow channel disposed in the manifold, the two ends of which communicate with the head portion and the pivot hole; the manifold The pivot end of the manifold extends into the chamber of the base; an axial manifold has a top end and a bottom end; a second flow channel is provided in the axial manifold, one end of the second flow channel passes through the top end of the axial manifold; the axial manifold is airtightly installed between the base and the cylinder body and extends through the chamber; one end of the second flow channel of the axial manifold is connected to the compression chamber The pivot end of the pressure gauge is airtightly pivoted to the axial manifold and is rotatable between a storage position and a use position. The first flow channel of the pressure gauge is connected to the second flow channel of the axial manifold. When the pressure gauge is in the storage position, it is above the pedal of the base. When the pressure gauge is in the use position, it is away from the pedal.

With this structure, the pressure gauge can rotate between a storage position and a use position, with the axial manifold serving as the center of rotation. When in the storage position, the pressure gauge is aligned with the base, while in the use position, it is not aligned with the base. The user can conveniently rotate the pressure gauge between the storage position and the use position to store or use the pump. A gas flow channel is provided between the axial manifold, which serves as the center of rotation for the pressure gauge, and the pressure gauge.

Furthermore, the present invention utilizes a rotating pressure gauge to house the pressure gauge of the air pump. The cylinder of the air pump is securely mounted on the base, and the base and cylinder do not rotate relative to each other. Therefore, the present invention does not affect the structural strength of the air pump.

Preferably, a central hole is vertically disposed in the base and intersects with the chamber; the axial manifold is passed through the central hole, and its top end penetrates the compression space of the cylinder.

Preferably, the pump has a check member disposed between the axial manifold and the compression space, the check member preventing the gas in the second flow channel from flowing back into the compression space.

Preferably, the anti-return component includes: an end piece and a anti-return member, the end piece being disposed at the top end of the axial manifold; a communication hole disposed in the end piece, one end of which communicates with the compression space; an accommodating space formed between the end piece and the axial manifold and communicating with the other end of the communication hole and the second flow channel; and a anti-return member disposed in the accommodating space and movable up and down. When the anti-return member moves toward the communication hole, it closes the communication hole; when the anti-return member moves toward the second flow channel, it fails to close the second flow channel.

Preferably, a plurality of protrusions are provided on the top end of the second flow channel or the circumferential surface of the bottom side of the accommodating space; the anti-return member is blocked by the protrusions and cannot close the second flow channel.

Preferably, the second flow channel includes: a longitudinal section disposed longitudinally along the axial manifold; a radial section disposed radially along the axial manifold; the longitudinal section communicating with the radial section; and an annular groove disposed on the circumference of the axial manifold and communicating with the radial section; the first flow channel of the pressure gauge communicates with the annular groove.

Preferably, a positioning portion is provided on a surface of the manifold of the pressure gauge; a wall surface of the chamber is provided with a storage positioning point and a use positioning point; when the pressure gauge is in the storage position, the positioning portion engages with the storage positioning point; when the pressure gauge is in the use position, the positioning portion engages with the use positioning point.

Preferably, an outlet channel is provided in the manifold of the pressure gauge, one end of which is connected to the first channel; an outlet connector is provided on the manifold of the pressure gauge; the other end of the outlet channel is connected to the outlet connector. The outlet connector can be connected to a gas nozzle connector.

Preferably, the cylindrical portion is hollow, and a mounting hole with an open top is formed therein; the bottom end of the cylinder body is mounted in the mounting hole.

Preferably, a leak-proof ring is disposed between the circumferential surface of the axial manifold and the circumferential wall of the hub of the pressure gauge; the cylindrical portion is hollow, and a mounting hole with an open top is formed therein; an end piece is connected to the top end of the axial manifold from the compression space, and a leak-proof ring is disposed between the bottom surface of the end piece and the bottom wall of the mounting hole.

10: Air pump

20: Base

22: Barrel

23: Mounting hole

24: First pedal

25: Second pedal

26: Storage Room

271: Storage positioning point

272: Using Anchor Points

28: Heart Hole

30: Cylinder body

32: Compressed Space

33: Clamping ring

34: Airtight ring

40: Piston rod

42: Piston

43: Circle

44: Cylinder cover

46: Grip

50: Pressure gauge

51: Head

52: Manifold

521: Hub terminal

53: Positioning unit

54: hinge

55: First flow channel

56: Axis

57:Pointer

58: Dial

59: Pneumatic components

591:Driver

60: Axial manifold

601:Protruding ring

602: First anti-leakage ring

603: Second anti-leakage ring

604: Third anti-leakage ring

62: Second flow channel

621: Longitudinal Section

622: Radial Segment

623: Ring Groove

65: End piece

66: Connecting hole

68: Fourth anti-leakage ring

70: Anti-return component

72: Accommodation Space

721: Upper concave

722: Concave

74:convex part

76: Anti-return device

80: Air nozzle connector

82: Hose

84: Exhaust channel

85: Air outlet connector

The purpose, features and effects achieved by the present invention can be understood from the following description and drawings of the preferred embodiments, among which:

Figure 1 is a perspective view of a floor-standing air pump according to a preferred embodiment of the present invention, showing the pressure gauge of the air pump in the stowed position.

Figure 2 is an exploded perspective view of the air pump in Figure 1.

Figure 3 is a longitudinal cross-sectional view of the air pump in Figure 1 taken along line 3-3.

Figure 4 is a partial enlargement of Figure 3.

Figure 5 shows an exploded perspective view of the pressure gauge in Figure 1.

Figure 6 is a partial enlargement of Figure 4.

Figure 7 is a bottom perspective view of the pressure gauge in Figure 1.

Figure 8 is a top view of Figure 1.

Figure 9 is another perspective view of the air pump in Figure 1, showing the pressure gauge of the air pump in the use position.

Figure 10 is a cross-sectional view taken along line 10-10 in Figure 9.

Figure 11 is a top view of Figure 9.

Terms such as "upper," "lower," "top," "bottom," "inner," and "outer" used in this specification and patent application to describe directions and positions are based on the directions shown in the drawings.

Please refer to Figures 1 to 3, which show a floor-standing air pump 10 (referred to as the pump) with a storable pressure gauge provided in a preferred embodiment of the present invention, which includes the following components.

A base 20 is elongated; a cylindrical portion 22 is located on the top of the base and protrudes upward. Referring to Figure 4, the cylindrical portion 22 is hollow, forming an internal mounting hole 23. The top end of the cylindrical portion 22 extends through the top of the cylindrical portion 22, while the bottom end is closed. Preferably, the cylindrical portion 22 is located in the center of the base 20, forming a first pedal 24 and a second pedal 25 on either side of the cylindrical portion 22. A concave chamber 26 is provided along the diameter of the cylindrical portion 22, extending from the circumference toward the interior of the cylindrical portion 22. The chamber 26 forms an open space with an opening, preferably in a fan-shaped configuration.

A hollow cylinder 30, a metal tube, contains a compressed space 32. Cylinder 30 is upright connected to the base, with its bottom end mounted in the mounting hole 23 of the cylindrical portion 22 of the base 20. A clamping ring 33, a hollow nut, is screwed onto the external threads at the top of the cylindrical portion 22 to secure the cylinder 30. The ring 33 also compresses an airtight ring 34, which is positioned between the top edge of the cylindrical portion 22 and the outer circumference of the cylinder 30. The airtight ring 34 is compressed by the clamping nut 33, maintaining an airtight seal between the bottom end of the cylinder 30 and the cylindrical portion 22.

A central hole 28 is vertically formed through the base 20. The central hole 28 intersects with the chamber 26, and its top end penetrates the bottom wall of the installation hole 23 and connects to the compression space 32 of the cylinder 30.

A piston rod 40 and a piston 42 are mounted at the bottom end of the piston rod 40. The bottom end of the piston rod 40 and the piston 42 are installed in the compression space 32 of the cylinder 30. A cylinder cover 44 covers the top end of the cylinder 30, sealing the compression space 32. The top end of the piston rod 40 extends through the cylinder cover 44. A handle 46 is mounted on the top end of the piston rod 40. Gripping the handle 46 allows the piston rod 40 and the piston 42 to be moved up and down, causing the piston 42 to compress the gas in the compression space 32. The piston 42 is a one-way piston. As it moves toward the bottom of the cylinder 30, it compresses the gas within the compression space 32. As the piston 42 moves toward the top of the cylinder 30, the soft ring 43 surrounding the piston deforms, preventing it from compressing the gas and allowing ambient air to enter the compression space.

A pressure gauge 50 (see Figures 2 and 4-5) comprises a head 51 and a manifold 52. One end (external end) of the manifold 52 is connected to the head, and the other end (inner end) is a pivot 521. A pivot hole 54, a vertical hole, is provided in the pivot 521 of the manifold 52. A first flow channel 55 is provided in the manifold, with its two ends connecting the head 51 and the pivot 54. A rotating shaft 56, a pointer 57, and a dial 58 are mounted in the head 51. The dial 58 has a scale (not shown). A pneumatic member 59 is provided in the first flow channel 55. When pressurized gas flows into the first flow channel 55, the pneumatic member 59 is actuated by the pressure of the pressurized gas, which in turn drives the rotating shaft 56 via a drive member 591, causing the pointer 57 to rotate and move to a scale on the dial to display the air pressure value. The structure and operation of the pressure gauge 50 for displaying air pressure values are not the primary subject matter of this invention and will not be described in detail. The pivot end 521 of the pressure gauge 50 is pivotally mounted in the chamber 26 of the barrel 22 and can rotate within the chamber 26. The head portion 51 of the pressure gauge 50 is located outside the chamber 26.

An axial manifold 60 is upright mounted in the base and serves as a pivot point for the pressure gauge 50. It has a top end and a bottom end. A second flow channel 62 is provided in the axial manifold 60 and includes a longitudinal section 621, a radial section 622, and an annular groove 623. The longitudinal section 621 extends along the axis. The longitudinal direction of the axial manifold 60 is set, and the radial section 622 is set along the radial direction of the axial manifold. The top end of the longitudinal section 621 passes through the top end of the axial manifold, and its bottom end is connected to the radial section 622. The annular groove 623 is provided on the circumferential surface of the axial manifold 60 and is connected to the two ends of the radial section 622. The axial manifold 60 is inserted through the central hole 28 of the base 20 and the pivot hole 54 of the pivot end 521 of the pressure gauge 50. Its top end passes from the central hole 28 through the bottom wall of the mounting hole 23 and into the compression space 32 of the cylinder 30, allowing one end (top end) of the second flow channel 62 to communicate with the compression space 32.

An end piece 65 is connected to the top end of the axial manifold 60 from the compression space 32. In this embodiment, the end piece 65 is a nut, and its threaded hole is screwed onto the top end of the axial manifold. The bottom surface of the end piece 65 contacts the bottom wall of the installation hole 23. The bottom end of the axial manifold 60 has a large outer diameter protrusion 601. The protrusion 601 abuts against the base 20. When the end piece 65 is tightened, the axial manifold 60 is fixed to the base 20. A connecting hole 66 is axially disposed in the end piece 65, with its two ends connecting one end of the second flow channel 62 and the compression space 32. The second flow channel 62 of the axial manifold 60 is connected to the compression space 32 of the cylinder 30 via the connecting hole 66.

Referring to Figure 4 , the pivot end 521 of the pressure gauge 50 is pivotally connected to the axial manifold 60 , allowing it to rotate between a stowed position (as shown in Figure 1 ) and an operational position (as shown in Figure 9 ) using the axial manifold as a pivot point. The width of the chamber 26 allows the pressure gauge to rotate through an angle of 60 to 120 degrees, preferably 90 degrees. One end (the inner end) of the first flow channel 55 of the pressure gauge 50 is connected to the annular groove 623 of the second flow channel 62 . Because the annular groove 623 is a full circle, the first flow channel 55 and the second flow channel 62 remain connected regardless of the angular position to which the pressure gauge 50 is rotated. The axial manifold 60 serves as the rotational center of the pressure gauge 50 and is connected to the pressure gauge's flow path to guide gas flow. A first and second leak-proof rings 602 and 603 are installed between the circumference of the axial manifold 60 and the peripheral wall of the pivot hole 54, ensuring an airtight seal between the pivot end 521 of the pressure gauge 50 and the axial manifold 60. A third leak-proof ring 604 is installed between the circumference of the axial manifold 60 and the threaded hole of the end piece 65. A fourth leak-proof ring 68 is installed between the bottom surface of the end piece 65 and the bottom wall of the mounting hole 23. The third and fourth leak-proof rings 604 and 68 maintain an airtight seal between the axial manifold 60, the mounting hole 23 of the barrel 22, and the end piece 65.

Referring to FIG. 6 , the air pump 10 further includes a check member 70 disposed between the axial manifold 60 and the compression space 32 to prevent pressurized gas from flowing back into the compression space 32 from the second flow channel 62. In this embodiment, the end piece 65 constitutes a portion of the check member 70. A receiving space 72 is formed between the bottom surface of the end piece 65 and the top end of the axial manifold 60, and connects the through hole 66 of the end piece 65 and the top end of the longitudinal section 621 of the second flow channel 62. The receiving space 72 is formed by an upper recess 721 disposed on the bottom surface of the end piece 65 and a lower recess 722 disposed on the top surface of the axial manifold 60. Several protrusions 74 are provided around the circumference of the lower recess 722 of the accommodating space 72 or at the top of the second flow channel 62. Gaps are formed between the protrusions 74 to allow gas to flow. A spherical check member 76 is mounted in the accommodating space 72 and is movable up and down. When the check member 76 moves toward the communication hole 66, it blocks and seals the communication hole 66. As the check member 76 moves toward the second flow channel 62, it lands on the protrusions 74, preventing it from sealing the top of the second flow channel 62. This allows gas to flow from the compression space 32 to the second flow channel 62.

In the preferred embodiment, the air pump 10 has an outlet channel 84 and an outlet connector 85, which are mounted on the manifold 52 of the pressure gauge 50. One end of the outlet channel 84 is connected to the first channel 55, and the other end is connected to the outlet connector. A nozzle connector 80 has a hose 82 connected to the outlet connector 85. Compressed gas from the air pump 10 flows through the second channel 62, the first channel 55, and the outlet channel 84, inflating the tire through the nozzle connector 80. The outlet channel 84 and outlet connector 85 can be positioned in other locations, such as on the base and connected to the second channel, and are not limited to being positioned on the manifold as shown in the preferred embodiment.

Figures 1 and 8 show the pump 10 in the stowed state, with the pressure gauge 50 in the stowed position. At this point, the pressure gauge 50 is directly above the first pedal 24, overlapping with the first pedal 24. This minimizes the size of the pump 10, making it suitable for storage, packaging, and transportation.

To inflate a tire using the pump 10, the user rotates the pressure gauge 50 to the operating position shown in Figures 9 to 11, making it easier for the user to view the pressure gauge. At this point, the pressure gauge 50 is away from the first pedal 24 and does not overlap with the base 20 or any of the pedals. The user can then step on either pedal 24, 25, or any of the pedals, and reciprocate by pulling and pushing the piston rod 40 up and down, causing the piston 42 to compress the gas within the compression space 32. When the piston 42 compresses the compression space 32 downward, pressurized gas flows from the compression space 32 into the communication hole 66, passes through the check member 70, and then flows into the second flow channel 62 of the axis manifold 60, the first flow channel 55 of the pressure gauge 50, and then is injected into the tire through the outlet flow channel 84, the hose 82, and the valve connector 80, thereby inflating the tire. The pressure gauge 50 can display the inflation pressure value for the user to view.

As the piston 42 moves toward the top of the cylinder 30, external air is drawn into the compression space 32. At this point, the air pressure within the second flow channel 62 becomes greater than the air pressure within the compression space 32. The air pressure within the second flow channel 62 pushes the check member 76 of the check member 70 upward, blocking the communication hole 66 and preventing the pressurized air within the first flow channel 55 and the second flow channel 62 from flowing back into the compression space 32.

Referring to FIG7 , a surface (e.g., bottom surface) of the manifold 52 of the pressure gauge 50 is provided with a positioning portion 53. In the preferred embodiment, the positioning portion is a resilient buckle or similar structure. Referring to FIG2 , a wall surface (e.g., bottom wall) of the chamber 26 is provided with a concave storage positioning point 271 and a use positioning point 272 that cooperate with the positioning portion 53. When the pressure gauge 50 is in the storage position, as shown in FIG4 , the positioning portion 53 engages with the storage positioning point 271 to maintain the pressure gauge in the storage position. When the pressure gauge 50 is rotated to the use position, as shown in FIG10 , the positioning portion 53 engages with the use positioning point 272 to maintain the pressure gauge in the use position. When the user rotates the pressure gauge 50, the positioning portion 53 can be disengaged from the storage positioning point 271 or the use positioning point 272.

The floor-standing air pump provided by this invention utilizes a simple and rational structure, allowing the user to easily rotate the pressure gauge horizontally, conveniently switching between the storage position and the operating position. The pressure gauge can be rotated between the storage position and the operating position without lifting the pump off the ground, making operation convenient and labor-saving.

The base of a floor-standing pump is the core structure that secures the cylinder. The present invention utilizes a pressure gauge that can rotate relative to the cylinder and base. The base and cylinder are fixedly connected and do not rotate relative to each other, maintaining the structural strength of the floor-standing pump.

The above-described embodiments are intended only to illustrate the features of the present invention and are not intended to be limiting. Any equivalent modifications to the scope of the present invention's patent application should be considered within the scope of protection. This invention represents a novel structure for similar products and offers enhanced functionality, thus meeting the patent requirements.

20: Base

22: Barrel

23: Mounting hole

24: First pedal

25: Second pedal

26: Storage Room

271: Storage positioning point

28: Heart Hole

30: Cylinder body

32: Compressed Space

33: Clamping ring

34: Airtight ring

40: Piston rod

42: Piston

43: Circle

50: Pressure gauge

51: Head

52: Manifold

521: Hub terminal

53: Positioning unit

54: hinge

55: First flow channel

56: Axis

57:Pointer

58: Dial

59: Pneumatic components

60: Axial manifold

601:Protruding ring

602: First anti-leakage ring

603: Second anti-leakage ring

604: Third anti-leakage ring

62: Second flow channel

621: Longitudinal Section

622: Radial Segment

623: Ring Groove

65: End piece

66: Connecting hole

68: Fourth anti-leakage ring

70: Anti-return component

76: Anti-return device

82: Hose

84: Exhaust channel

85: Air outlet connector

Claims (10)

A floor-standing air pump with a storable pressure gauge comprises: a base; a cylindrical portion disposed on the base and protruding upward; the base having at least one pedal located on one side of the cylindrical portion; a concave chamber extending from the circumference of the cylindrical portion toward the interior of the cylindrical portion; a hollow cylinder having a compression space within it, the bottom end of the cylinder being mounted on the cylindrical portion of the base; a piston rod; a piston disposed at the bottom end of the piston rod; the piston and the bottom end of the piston rod are mounted in the compression space of the cylinder, and the piston is capable of compressing gas in the compression space; A pressure gauge comprises a head and a manifold, one end of the manifold being connected to the head and the other end being a pivot end; a pivot hole being provided at the pivot end of the manifold; a first flow channel being provided in the manifold, two ends of which connect the head and the pivot hole; the pivot end of the manifold extending into the chamber of the base; An axial manifold having a top end and a bottom end; a second flow channel disposed in the axial manifold, one end of the second flow channel extending through the top end of the axial manifold; the axial manifold is airtightly mounted between the base and the cylinder body and extends through the chamber; one end of the second flow channel communicates with the compression space; the pivot end of the pressure gauge is airtightly pivotally connected to the axial manifold and is rotatable between a stowed position and a use position using the axial manifold as a fulcrum, with the first flow channel of the pressure gauge communicating with the second flow channel of the axial manifold; when the pressure gauge is in the stowed position, it is above the pedal of the base; when in the use position, the pressure gauge is away from the pedal. An air pump as described in claim 1, wherein: a center hole is uprightly arranged in the base and intersects with the chamber; the axial manifold is penetrated in the center hole, and its top end penetrates into the compression space of the cylinder body. The air pump as described in claim 1, wherein: a check member is arranged between the axial manifold and the compression space, and the check member prevents the gas in the second flow channel from flowing back into the compression space. An air pump as described in claim 3, wherein: the non-return component includes: an end piece and a non-return piece, the end piece is arranged at the top end of the axial manifold; a connecting hole is arranged in the end piece, one end of which is connected to the compression space; an accommodating space is formed between the end piece and the axial manifold, the accommodating space is connected to the other end of the connecting hole and the second flow channel; the non-return piece is arranged in the accommodating space and can move up and down. When the non-return piece moves upward toward the connecting hole, it will close the connecting hole; when the non-return piece moves downward toward the second flow channel, it cannot close the second flow channel. An air pump as described in claim 4, wherein: a plurality of protrusions are provided on the top end of the second flow channel or the peripheral surface of the bottom side of the accommodating space; the check member is blocked by the protrusions and cannot close the second flow channel. An air pump as described in claim 1, wherein: the second flow channel includes: a longitudinal section, arranged along the longitudinal direction of the axial manifold; a radial section, arranged along the radial direction of the axial manifold; the longitudinal section is connected to the radial section; the annular groove is arranged on the circumference of the axial manifold and is connected to the radial section; the first flow channel of the pressure gauge is connected to the annular groove. An air pump as described in claim 1, wherein: a surface of the manifold of the pressure gauge is provided with a positioning portion; a wall surface of the chamber is provided with a storage positioning point and a use positioning point; when the pressure gauge is located in the storage position, the positioning portion is engaged with the storage positioning point; when the pressure gauge is located in the use position, the positioning portion is engaged with the use positioning point. An air pump as described in claim 1, wherein: an air outlet channel is provided in the manifold of the pressure gauge, one end of which is connected to the first channel; an air outlet connector is provided on the manifold of the pressure gauge; the other end of the air outlet channel is connected to the air outlet connector. An air pump as described in claim 1, wherein: the barrel is hollow, and a mounting hole with an open top is formed inside the barrel; the bottom end of the cylinder body is mounted in the mounting hole. An air pump as described in claim 1, wherein: a leak-proof ring is provided between the circumferential surface of the axial manifold and the circumferential wall of the hub of the pressure gauge; the cylinder is hollow, and a mounting hole is formed inside the cylinder with an open top end and a closed bottom end; an end piece is connected to the top end of the axial manifold from the compression space, and a leak-proof ring is provided between the bottom surface of the end piece and the bottom wall of the mounting hole.