CORE OF INFLATABLE PUMP

A core of an inflatable pump has a casing base, a casing cover, an electric motor, a piston rod, a transmission set, and an inflation adapter. The casing base has a base portion, a rear portion formed at an end of the base portion, a cylinder portion integrally formed with the rear portion, and two triangular sidewall portions oppositely connected to the base portion and the rear portion to form a triangular enclosure with sloping. The casing cover tightly closes the casing base. The electric motor is disposed at the base portion. The piston rod is disposed in the cylinder portion. The transmission set is disposed in the casing base and is connected between the piston rod and the electric motor. Therefore, the connection strength, the heat dissipation efficiency, the convenience of assembly of the core are improved. The material usage and the noise of the core are reduced.

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Description
BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to an inflatable device configured to inflate objects such as tires, balls, etc., and more particularly to an electric inflatable pump.

2. Description of Related Art

A conventional electric inflatable pump configured to inflate objects, such as tires, balls, etc., comprises a core substantially comprising an electric motor mounted to a bottom of a base, a cylinder mounted to a side of the base, and a piston rod disposed in the cylinder. A shaft of the electric motor extends to a top of the base and is connected to an end of the piston rod via a gear set. An inflation adapter with a check valve is disposed at an end of the cylinder.

When in use, an inflation conduit fluidly connected with the inflatable adapter is connected to an inflatable object via a connector thereof. The piston rod is driven by the electric motor via the gear set to move reciprocally in the cylinder to generate compressed air. The compressed air is conducted into the inflatable object via the inflation adapter. Though the foregoing mentioned core of the inflatable pump has an inflation function, the gear set disposed on the base and connected between the electric motor and the piston rod are exposed, resulting in loud noise during operation. In addition, since the cylinder is assembled to the side of the base, respective assembling structures fitting to each other have to be formed on the cylinder and the base for assembly. It is highly time consuming and laborious to assemble the core of the inflatable pump. The connection between the cylinder and the base is not rigid and is prone to breakage.

To overcome the shortcomings, the present invention provides a core of an inflatable pump to mitigate or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide a core of an inflatable pump that can mitigate problems of loud noise, high time consumption and labor of assembling, poor structural strength between base and cylinder, and prone to breakage.

The core of the inflatable pump comprises a casing base, a casing cover, an electric motor, a piston rod, a transmission set, and an inflation adapter. The casing base comprises a base portion, a rear portion formed at one of two ends of the base portion, a transmission space formed between the rear portion and the base portion, a cylinder portion with a connection end portion formed at the rear portion and extending away from the base portion, and two triangular sidewall portions respectively formed at two opposite sides of the transmission space and between the base portion and the rear portion. The two triangular sidewall portions extend from the rear portion to the other one of the two ends of the base portion. The casing cover is detachably and tightly disposed on the casing base and closes the transmission space. The electric motor is disposed at the base portion of the casing base and comprises a rotor extending into the transmission space of the casing base. The piston rod is disposed in the cylinder portion of the casing base and extends into the transmission space of the casing base. The transmission set is disposed in the transmission space of the casing base and is connected between the piston rod and the rotor of the electric motor. The inflation adapter is disposed at the connection end portion of the cylinder portion of the casing base.

Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a core of an inflatable pump in accordance with the present invention;

FIG. 2 is an exploded perspective view of the core of the inflatable pump in FIG. 1;

FIG. 3 is a side view in partial section of the core of the inflatable pump in FIG. 1;

FIG. 4 is another side view in partial section of the core of the inflatable pump in FIG. 1;

FIG. 5 is a perspective view of a casing base of the core of the inflatable pump in FIG. 1; and

FIG. 6 is an enlarged perspective view of the core of the inflatable pump in FIG. 1.

 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

With reference to FIGS. 1 and 2, a core 1 of an inflatable pump in accordance with the present invention comprises a casing base 10, a casing cover 11, an electric motor 12, a piston rod 13, a transmission set 14, and an inflation adapter 15. The inflatable pump may further comprise a fan wheel 16.

With reference to FIGS. 1 to 4, an X-axis, a Y-axis, and a Z-axis being perpendicular to one another in there-dimensional space are defined in the casing base 10. The casing base 10 comprises a base portion 101, a rear portion 102, a cylinder portion 103, and two triangular sidewall portions 104. The rear portion 102 is formed at an end of the base portion 101 on the X-axis and extends along the Z-axis. A transmission space 100 is formed between the base portion 101 and the rear portion 102. The cylinder portion 103 is integrally formed with the rear portion 102 and extends along the X-axis away from the base portion 101. The cylinder portion 103 has a cylinder chamber fluidly communicating with the transmission space 100 through the rear portion 102. A connection end portion 1031 is formed at an end of the cylinder portion 103 away from the rear portion 102. The two triangular sidewall portions 104 are respectively located at two opposite sides of the transmission space 100 on the Y-axis and extend along the X-axis from the rear portion 102 to the other end of the base portion 101. Because the two triangular sidewall portions 104 are respectively located at the two opposite sides of the transmission space 100 on the Y-axis and connected to the base portion 101 and the rear portion 102, the mechanical strength around the base portion 101 and the rear portion 102 of the casing base 10 is enhanced. Accordingly, the casing base 10 can be formed as a triangular enclosure with sloping, thereby decreasing material usage, lowering costs, and lowering weight thereof. In addition, since the cylinder portion 103 is integrally formed with the rear portion 102, the structure thereof is simplified, assembling convenience is enhanced, and an assembly step of a separation cylinder part assembled to a side of a conventional base is omitted.

With reference to FIGS. 1 to 4, the casing cover 11 is detachably disposed on the casing base 10. A rim of the casing cover 11 closely attaches to a rim of the casing base 10 around the base portion 101, the rear portion 102, and the two triangular sidewall portions 104. The casing cover 11 may be secured on the casing base 10 via snap-fit joints or fasteners. In the embodiment, the casing cover 11 is secured on the casing base 10 via snap-fit joints for ease of assembly and detachment. The casing cover 11 tightly covers an opening of the transmission space 100 of the casing base 10 to form a closed room.

With reference to FIGS. 1 and 2, the casing cover 11 has a mounting portion 111 at an end of the casing cover 11 facing toward the rear portion 102 and at least one hook 112 at an opposite end of the casing cover 11 facing away from the rear portion 102. The casing cover 11 is secured on the casing base 10 with a connection of the mounting portion 111 and the rear portion 102 of the casing base 10 and snap-fit joints of the at least one hook 112 and the end of the base portion 101 away from the rear portion 102.

With reference to FIGS. 1, 2, and 4, the electric motor 12 is disposed to a side of the base portion 101 of the casing base 10 away from the casing cover 11 and is secured on the casing base 10 via fasteners such as bolts. The electric motor 12 comprises a motor housing 121, a stator disposed in the motor housing 121, and a rotor 122 in the motor housing 121 and rotatably disposed through the stator. An end of the rotor 122 extends through the base portion 101 and extends into the transmission space 100.

With FIG. 2, and 4 to 6, the motor housing 121 of the electric motor 12 has at least one ventilation hole 123 formed through a side of the motor housing 121 facing toward the base portion 101. The casing base 10 has a propped block 105 formed on the side of the base portion 101 facing away from the transmission space 100 to form at least one exhausting zone 106 next to the propped block 105. The propped block 105 abuts against the motor housing 121 of the electric motor 12. The at least one ventilation hole 123 corresponds to the at least one exhausting zone 106 in position. Thermal flow generated by the operating electric motor 12 may be cast out through the at least one ventilation hole 123 of the motor housing 121 and the exhausting zone 106. In the embodiment, the propped block 105 is a cruciform block with four arms. The rotor 122 of the electric motor 12 is supported at a center of the cruciform propped block 105. A respective exhausting zone 106 is formed between each adjacent two of the four arms of the propped block 105. The electric motor 12 is stably supported by the propped block 105 of the casing base 10 with good heat dissipation.

With reference to FIGS. 2 to 4, the piston rod 13 is linearly, reciprocally, and movably disposed in the cylinder portion 103 of the casing base 10 and extends into the transmission space 100. In the embodiment, the piston rod 13 has a piston segment 131 and a piston ring 132. The piston segment 131 has a piston head 1311 at one end thereof and a pivot end 1312 at the other end thereof. The piston ring 132 surrounds the piston head 1311 and tightly contacts an internal peripheral surface of the cylinder portion 103. The pivot end 1312 is disposed in the transmission space 100.

With reference to FIGS. 2 to 4, the transmission set 14 is disposed in the transmission space 100 of the casing base 10 and is disposed between and connected with the piston rod 13 and the rotor 122 of the electric motor 12. The piston rod 13, in the cylinder portion 103 of the casing base 10, is driven to move linearly and reciprocally by the electric motor 12.

With reference to FIGS. 2 to 4, in the embodiment, the transmission set 14 comprises a driving gear 141 and a driven gear 142. The driving gear 141 is disposed on the end of the rotor 122 of the electric motor 12 extending into the transmission space 100. The driven gear 142 is rotatably disposed on the base portion 101 of the casing base 10 and engages with the driving gear 141. The piston rod 13 is eccentrically connected to and is rotatable relative to the driven gear 142 via the pivot end 1312. The driving gear 141 is a small gear, and the driven gear 142 is a large gear being larger than the driving gear 141 in size. The driven gear 142 has a hollow portion adjacent to the eccentric position being connected with the piston rod 13, thereby decreasing material usage thereof, lowering weight, and lowering load on the electric motor 12.

With reference to FIG. 1, and 2 to 4, the inflation adapter 15 is disposed at the connection end portion 1031 of the cylinder portion 103 of the casing base 10 and comprises an adapter body 151 and a check valve 152 disposed in the adapter body 151. The adapter body 151 has one end connected to the connection end portion 1031 of the cylinder portion 103 and an inflating end 153 at the other end away from the cylinder portion 103. The check valve 152 disposed in the adapter body 151 is configured to control unidirectional discharge of compressed air from the cylinder portion 103 to the inflating end 153.

With reference to FIGS. 1, 2, and 4, the fan wheel 16 is disposed to the other end of the rotor 122 of the electric motor 12 to facilitate heat dissipation of the electric motor 12.

The core 1 of the inflatable pump in accordance with the present invention may be disposed in a housing with a switch. The switch is electrically connected to the electric motor 12. An inflation conduit is connected to the inflating end 153 of the inflation adapter 15 and has a connector at an end thereof. The above-mentioned components constitute an inflatable pump. The switch of the inflatable pump may be electrically connected to an exterior power supply or a power storage unit, e.g. a rechargeable battery, disposed in the housing. An inflatable object such as a tire may be connected to the core 1 of the inflatable pump via the connector at the end of the inflation conduit. When the switch is turned on, the electric motor 12 is in electricity and drives the transmission set 14 to drive the piston rod 13 to move reciprocally in the cylinder portion 103 of the casing base 10 to generate compressed air. The compressed air is conducted into the inflatable object via the inflation adapter 15 and inflation conduit.

According to the above-mentioned features and structural relationships of the core 1 of the inflatable pump in accordance with the present invention, the casing base 10 has the cylinder portion 103 integrally formed with the rear portion 102 and is formed as the triangular enclosure structure with sloping constructed by the two triangular sidewall portions 104 at the two opposite sides of the base portion 101 and rear portion 102. The connection strength between the cylinder portion 103 and the rear portion 102 is enhanced. Dissipation of heat generated by the movement of the piston rod 13 in the cylinder portion 103 is enhanced. The service life of the core 1 of the inflatable pump is prolonged. Material of the casing base 10 may be reduced to lower cost and weight. The structure of the casing base 10 is simplified. The assembling convenience is enhanced. An assembling step for assembling separation cylinder part to a rear portion of a conventional base can be omitted. In addition, since an opening of the transmission space 100 of the casing base 10 is tightly closed by the casing cover 11 to form a closed room, noise generated during operation of the transmission set 14 and the piston rod 13 in the casing base 10 is prevented from spreading outward, thereby lowering the noise.

The casing base 10 of the core 1 may further comprise the propped block 105 formed on the side of the base portion 101 away from the transmission space 100 and the at least one exhausting zone 106 next to the propped block 105. The propped block 105 abuts against the motor housing 121 of the electric motor 12 with the at least one ventilation hole 123 directly facing to the at least one exhausting zone 106. Therefore, the thermal flow generated by the operating electric motor 12 may exhaust to said exhausting zone 106 via said ventilation hole 123. In addition, the propped block 105 may be a cruciform block with four arms. The rotor 122 of the electric motor 12 is supported at the center of the cruciform propped block 105. A respective exhausting zone 106 is formed between two adjacent arms. The electric motor 12 is stably supported by the propped block 105 of the casing base 10 with good heat dissipation.

In addition, the casing cover 11 is connected to the casing base 10 via snap-fit joints for ease of assembly and lowering costs.

Claims

1. A core of an inflatable pump comprising:

a casing base comprising a base portion having two ends; a rear portion formed at one of the two ends of the base portion; a transmission space formed between the rear portion and the base portion; a cylinder portion formed at the rear portion, extending away from the base portion, and having a connection end portion; and two triangular sidewall portions respectively formed at two opposite sides of the transmission space between the base portion and the rear portion, extending from the rear portion to the other one of the two ends of the base portion;
a casing cover detachably and tightly disposed on the casing base and closing the transmission space;
an electric motor disposed at the base portion of the casing base and comprising a rotor having an end extending into the transmission space of the casing base;
a piston rod disposed in the cylinder portion of the casing base and extending into the transmission space of the casing base;
a transmission set disposed in the transmission space of the casing base and connected between the piston rod and the rotor of the electric motor; and
an inflation adapter disposed at the connection end portion of the cylinder portion of the casing base.

2. The core of the inflatable pump as claimed in claim 1, wherein the casing cover is secured on the casing base via snap-fit joints.

3. The core of the inflatable pump as claimed in claim 1, wherein

the transmission set comprises a driving gear and a driven gear;
the driving gear is disposed at the rotor of the electric motor;
the driven gear is rotatably disposed on the base portion of the casing base and engages with the driving gear; and
the piston rod is eccentrically connected to and is pivotable relative to the driven gear.

4. The core of the inflatable pump as claimed in claim 1, wherein a fan wheel is disposed at the rotor of the electric motor.

5. The core of the inflatable pump as claimed in claim 1, wherein

the electric motor comprises a motor housing having at least one ventilation hole formed through a side of the motor housing facing toward the base portion;
the rotor is disposed in the motor housing;
the casing base has a propped block formed on a side of the base portion facing away from the transmission space to form at least one exhausting zone next to the propped block;
the propped block abuts against the motor housing; and
the at least one ventilation hole corresponds to the at least one exhausting zone in position.

6. The core of the inflatable pump as claimed in claim 2, wherein

the electric motor comprises a motor housing having at least one ventilation hole formed through a side of the motor housing facing toward the base portion;
the rotor is disposed in the motor housing;
the casing base has a propped block formed on a side of the base portion facing away from the transmission space to form at least one exhausting zone next to the propped block;
the propped block abuts against the motor housing; and
the at least one ventilation hole corresponds to the at least one exhausting zone in position.

7. The core of the inflatable pump as claimed in claim 3, wherein

the electric motor comprises a motor housing having at least one ventilation hole formed through a side of the motor housing facing toward the base portion;
the rotor is disposed in the motor housing;
the casing base has a propped block formed on a side of the base portion facing away from the transmission space to form at least one exhausting zone next to the propped block;
the propped block abuts against the motor housing; and
the at least one ventilation hole corresponds to the at least one exhausting zone in position.

8. The core of the inflatable pump as claimed in claim 4, wherein

the electric motor comprises a motor housing having at least one ventilation hole formed through a side of the motor housing facing toward the base portion;
the rotor is disposed in the motor housing;
the casing base has a propped block formed on a side of the base portion facing away from the transmission space to form at least one exhausting zone next to the propped block;
the propped block abuts against the motor housing; and
the at least one ventilation hole corresponds to the at least one exhausting zone in position.

9. The core of the inflatable pump as claimed in claim 5, wherein

the propped block is a cruciform block with four arms;
the rotor of the electric motor is supported at a center of the propped block; and
a respective said exhausting zone is formed between each adjacent two of the four arms.

10. The core of the inflatable pump as claimed in claim 6, wherein

the propped block is a cruciform block with four arms;
the rotor of the electric motor is supported at a center of the propped block; and
a respective said exhausting zone is formed between each adjacent two of the four arms.

11. The core of the inflatable pump as claimed in claim 7, wherein

the propped block is a cruciform block with four arms;
the rotor of the electric motor is supported at a center of the propped block; and
a respective said exhausting zone is formed between each adjacent two of the four arms.

12. The core of the inflatable pump as claimed in claim 8, wherein

the propped block is a cruciform block with four arms;
the rotor of the electric motor is supported at a center of the propped block; and
a respective said exhausting zone is formed between each adjacent two of the four arms.
Patent History
Publication number: 20260201875
Type: Application
Filed: Jan 13, 2025
Publication Date: Jul 16, 2026
Inventor: Wei-Chi WANG (Tainan City)
Application Number: 19/019,355
Classifications
International Classification: F04B 35/04 (20060101); F04B 39/06 (20060101); F04B 39/12 (20060101);