Small electric air pump

Abstract

The utility model provides a small-sized electric air pump, which relates to the technical field of electric air pumps and comprises an electric air cylinder assembly, a circuit board, an air supply assembly and an air pressure sensor, the air outlet end of the electric air cylinder assembly is fixedly connected and communicated with one end of the air supply assembly, and the other end of the air supply assembly is used for being connected with an external inflatable object. The air pressure sensor is fixedly connected to one side of the air supply assembly and communicates with the air supply assembly, and the circuit board is electrically connected with the electric air cylinder assembly and the air pressure sensor. The small-sized electric air pump can immediately stop inflating when the inflating volume of an inflating object reaches enough safety in use, so that the inflating volume of the inflating object is prevented from being too much.

Description

Technical Field

[0001] This utility model relates to the field of electric air pump technology, and in particular to a small electric air pump. Background Technology

[0002] An electric air pump is a device driven by an electric motor used to perform inflation tasks, such as inflating basketballs, swimming rings, car tires, and bicycle tires. It is also suitable for inflation during machining or mechanical assembly. Compared with traditional manual tools, the emergence of small electric air pumps has greatly facilitated the daily inflation and processing needs of workers or users.

[0003] The handheld electric air pump with patent number CN110067732B uses a motor to drive a gear to reduce speed and complete the reciprocating pushing process of the piston to inflate inflatable items. However, during the inflation process, the piston directly pushes the compressed air in the cylinder into the inflatable item through the air nozzle. It lacks a corresponding air pressure sensing mechanism and a gas buffer space. As for the inflation volume of the inflatable item, the user can only judge the inflation volume by touching the inflatable item, which is not very accurate. Even when the inflation volume of the inflatable item is sufficient for safe use, it will continue to inflate, resulting in the inflated item being over-inflated, which is not conducive to subsequent use.

[0004] Therefore, it is necessary to propose a small electric air pump to immediately stop inflating the inflatable item when the inflation level reaches a level that is safe for use, so as to avoid over-inflating the inflatable item. Utility Model Content

[0005] To address the aforementioned issues, this invention proposes a small electric air pump that immediately stops inflating items once the inflation level has reached a level sufficient for safe use, thus preventing over-inflation.

[0006] This utility model is achieved through the following technical solution:

[0007] This utility model proposes a small electric air pump, including an electric cylinder assembly, a circuit board, an air supply assembly, and an air pressure sensor. The air outlet of the electric cylinder assembly is fixedly connected to and in communication with one end of the air supply assembly. The other end of the air supply assembly is used to connect to an external inflatable object. The air pressure sensor is fixedly connected to one side of the air supply assembly and in communication with the air supply assembly. The circuit board is electrically connected to the electric cylinder assembly and the air pressure sensor.

[0008] Furthermore, the air supply assembly includes a buffer cylinder and an air nozzle. One end of the buffer cylinder is sealed and fixedly connected to the air outlet of the electric cylinder assembly and is in communication with it. The other end of the buffer cylinder is sealed and connected to one end of the air nozzle and is in communication with it. The air pressure sensor is fixedly connected to one side of the buffer cylinder and is in communication with the buffer cylinder.

[0009] Furthermore, the buffer cylinder is provided with a buffer cavity, which is connected to the electric cylinder assembly, the air nozzle, and the air pressure sensor.

[0010] Furthermore, a placement slot is provided on one side of the buffer cylinder, the placement slot is connected to the buffer cavity, and the air pressure sensor is housed in the placement slot.

[0011] Furthermore, one end of the buffer cylinder is provided with a connection port, which is connected to the buffer cavity and is fixedly connected to and connected to the air nozzle.

[0012] Furthermore, the electric cylinder assembly includes a fixed frame, a first transmission wheel, a piston assembly, and a drive device. One end of the fixed frame is provided with a cylinder body, one end of the cylinder body is fixedly connected to and in communication with one end of the air supply assembly, one end of the piston assembly is sealed and slidably connected to the cylinder body, and the other end of the piston assembly is eccentrically rotatably connected to one side of the first transmission wheel. The central shaft of the first transmission wheel is rotatably connected to the fixed frame, and the drive device is fixedly connected to the other side of the fixed frame. The rotating shaft of the drive device is connected to the first transmission wheel.

[0013] Furthermore, the piston assembly includes a seal and a push rod. The outer wall of the seal forms a sealed sliding connection with the inner wall of the cylinder. One end of the push rod is embedded in the seal, and the other end of the push rod forms an eccentric rotational connection with one side of the first transmission wheel.

[0014] Furthermore, the seal is provided with an embedding groove, and one end of the push rod is provided with an embedding block, which is received in the embedding groove.

[0015] Furthermore, the small electric air pump also includes a housing, and the electric cylinder assembly, the circuit board, and the air supply assembly are all fixedly connected inside the housing.

[0016] Furthermore, the small electric air pump also includes a battery, which is fixedly connected inside the housing and electrically connected to the circuit board.

[0017] The beneficial effects of this utility model are:

[0018] This invention uses a circuit board to control an electric cylinder assembly. The air supply assembly acts as a buffer for the gas to be inflated, and a pressure sensor monitors the air pressure within the air supply assembly. When inflating an item, the electric cylinder assembly operates continuously, causing the air pressure inside the air supply assembly to rise. Once the air pressure reaches a level sufficient to open the air inlet of the item, inflation begins. Simultaneously, the air pressure inside the air supply assembly remains constant, exceeding the air pressure inside the item itself. When the internal inflation volume reaches a level sufficient for safe use, the constant value will be equal to the air pressure inside the inflatable item. If the air pressure inside the air supply component continues to rise at this time, the air pressure sensor will detect it and send feedback to the circuit board. The circuit board will then stop the operation of the electric cylinder assembly, thus completing the inflation of the inflatable item. The inflation volume of the inflatable item will then be maintained at a level sufficient for safe use. In summary, this small electric air pump can immediately stop inflation when the inflation volume of the inflatable item reaches a level sufficient for safe use, thus preventing the inflatable item from being over-inflated. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the small electric air pump of this utility model;

[0020] Figure 2 This is a schematic diagram of the overall design of the small electric air pump of this utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the small electric air pump of this utility model;

[0022] Figure 4 This is an exploded view of the air supply component of the small electric air pump of this utility model.

[0023] Figure 5 This is an exploded view of the electric cylinder assembly of the small electric air pump of this utility model.

[0024] The attached figures are labeled as follows:

[0025] Electric cylinder assembly 1, air outlet 101, fixing frame 11, cylinder body 111, first transmission wheel 12, piston assembly 13, seal 131, embedding groove 1311, push rod 132, embedding block 1321, drive device 14, second transmission wheel 141;

[0026] Circuit board 2;

[0027] Air supply assembly 3, buffer cylinder 31, buffer chamber 311, placement slot 312, connection port 313, air nozzle 32;

[0028] Barometric pressure sensor 4;

[0029] 5. Outer shell. Detailed Implementation

[0030] To more clearly and completely illustrate the technical solution of this utility model, the following description, in conjunction with the accompanying drawings, will provide further details.

[0031] Please refer to Figures 1-5 This utility model proposes a small electric air pump, including an electric cylinder assembly 1, a circuit board 2, an air supply assembly 3, and a pressure sensor 4. The air outlet 101 of the electric cylinder assembly 1 is fixedly connected to and conducts through one end of the air supply assembly 3. The other end of the air supply assembly 3 is used to connect to an external inflatable object. The pressure sensor 4 is fixedly connected to one side of the air supply assembly 3 and conducts through the air supply assembly 3. The circuit board 2 is electrically connected to the electric cylinder assembly 1 and the pressure sensor 4. The circuit board 2 is provided with a drive module, which is electrically connected to the electric cylinder assembly 1. The drive module is used to issue run or stop commands to the electric cylinder assembly 1, so that the electric cylinder assembly 1 operates or stops. The circuit board 2 is provided with a data processing module, which is used to receive the air pressure signal from the pressure sensor 4 and issue the corresponding operation command to the drive module through the air pressure signal. The circuit board 2 can be powered by a battery or by connecting to an external power source through wires.

[0032] In this embodiment, circuit board 2 controls the operation of electric cylinder assembly 1, and air supply assembly 3 serves as a buffer structure for the gas to be inflated. Simultaneously, air pressure sensor 4 monitors the air pressure within air supply assembly 3. When inflating an item, air supply assembly 3 is first connected to the air inlet of the item. At this point, the air inlet of the item is not yet connected to air supply assembly 3. After electric cylinder assembly 1 pumps gas into air supply assembly 3, the air pressure inside air supply assembly 3 rises. Once the air pressure reaches a level sufficient to open the air inlet of the item, inflation begins. Simultaneously, the air pressure inside air supply assembly 3 remains constant for a period of time; this period is for inflation. The inflation time of the item is recorded by the air pressure sensor 4 after obtaining a constant value. During the inflation process, the constant value will be greater than the air pressure inside the item. When the inflation volume inside the item reaches a safe level, the constant value will be equal to the air pressure inside the item. If the electric cylinder assembly 1 is still operating at this time, causing the air pressure inside the air supply assembly 3 to continue to rise, the air pressure sensor 4 will detect that the air pressure inside the air supply assembly 3 exceeds the original constant value and feed it back to the circuit board 2. The circuit board 2 will then stop the operation of the electric cylinder assembly 1, and the inflation of the item will be completed. The inflation volume of the item will be maintained at a safe level.

[0033] In summary, this small electric air pump can immediately stop inflating items when the inflation level reaches a safe level, thus preventing over-inflation.

[0034] In this embodiment, the air supply assembly 3 includes a buffer cylinder 31 and an air nozzle 32. One end of the buffer cylinder 31 is sealed and fixedly connected to the air outlet 101 of the electric cylinder assembly 1 and is in communication with it. The other end of the buffer cylinder 31 is sealed and connected to one end of the air nozzle 32 and is in communication with it. The air pressure sensor 4 is fixedly connected to one side of the buffer cylinder 31 and is in communication with the buffer cylinder 31. The buffer cylinder 31 is used to provide a space for buffering gas for the air supply of the electric cylinder assembly 1. The air nozzle 32 is used to connect to the air port of the inflatable item. When inflating the inflatable item, after the electric cylinder assembly 1 pumps gas into the buffer cylinder 31, the gas in the buffer cylinder 31 reaches the pressure value that can open the air port of the inflatable item, and then the gas in the buffer cylinder 31 is filled into the inflatable item through the air nozzle 32.

[0035] In this embodiment, the buffer cylinder 31 is provided with a buffer chamber 311, which is connected to the electric cylinder assembly 1, the nozzle 32, and the pressure sensor 4. The buffer chamber 311 is used to contain pressurized gas, and the pressure sensor 4 can also monitor the pressure inside the buffer chamber 311.

[0036] In this embodiment, a placement groove 312 is provided on one side of the buffer cylinder 31. The placement groove 312 is connected to the buffer cavity 311, and the pressure sensor 4 is housed in the placement groove 312. The placement groove 312 is used to provide a space for the pressure sensor 4 to be placed, so as to prevent the pressure sensor 4 from extending into the placement groove 312.

[0037] In this embodiment, one end of the buffer cylinder 31 is provided with a connection port 313, which is connected to the buffer cavity 311. The connection port 313 is fixedly connected to and connected to the air nozzle 32. The connection port 313 is used to provide a connection structure for the air nozzle 32. The connection port 313 is provided with threads, and the air nozzle 32 is also provided with threads. The air nozzle 32 is fixedly connected to the connection port 313 by threads.

[0038] In this embodiment, the electric cylinder assembly 1 includes a fixed frame 11, a first transmission wheel 12, a piston assembly 13, and a drive device 14. The drive device 14 is a DC brushless motor. One end of the fixed frame 11 is provided with a cylinder body 111, and an air outlet 101 is located on one end of the cylinder body 111. One end of the cylinder body 111 is fixedly connected to and in communication with one end of the air supply assembly 3, that is, the air outlet 101 is fixedly connected to and in communication with one end of the air supply assembly 3. One end of the piston assembly 13 is sealed and slidably connected inside the cylinder body 111, and the other end of the piston assembly 13 is eccentrically rotatably connected to one side of the first transmission wheel 12. The central shaft of the first transmission wheel 12 is rotatably connected to the fixed frame 11. The drive device 14 is fixedly connected to the other side of the fixed frame 11, and the rotating shaft of the drive device 14 is connected to the first transmission wheel 12. When pumping air, the drive device 14 rotates to drive the first transmission wheel 12. The first drive wheel 12 rotates, which in turn drives one end of the piston assembly 13 to rotate eccentrically, causing the other end of the piston assembly 13 to reciprocate within the cylinder 111. A one-way valve is provided on one side of the cylinder 111. When the other end of the piston assembly 13 moves backward, air is drawn in, creating a negative pressure within the cylinder 111. The one-way valve is opened by the negative pressure, allowing external air to enter the cylinder 111. When the other end of the piston assembly 13 moves forward to push air, the one-way valve closes due to its structural characteristics, allowing gas to be pushed into the air supply assembly 3. The drive device 14 has a second drive wheel 141 on its rotating shaft. The second drive wheel 141 and the first drive wheel 12 form a transmission connection. Both the second drive wheel 141 and the first drive wheel 12 can be rubber wheels that transmit power through mutual contact, or they can be gears that transmit power through meshing.

[0039] In this embodiment, the piston assembly 13 includes a seal 131 and a push rod 132. The outer wall of the seal 131 forms a sealed sliding connection with the inner wall of the cylinder 111. One end of the push rod 132 is embedded in the seal 131, and the other end of the push rod 132 forms an eccentric rotational connection with one side of the first transmission wheel 12. When pumping air, the push rod 132 is driven by the drive device 14 to reciprocate within the cylinder 111, which in turn pushes the seal 131 to reciprocate, thereby pumping air.

[0040] In this embodiment, the seal 131 is provided with an embedding groove 1311, and one end of the push rod 132 is provided with an embedding block 1321, which is received in the embedding groove 1311. The embedding groove 1311 has a cross structure, and the embedding block 1321 also has a cross structure. The cross structure can be used to securely fix the embedding block 1321 when it is fixed in the embedding groove 1311.

[0041] In this embodiment, the small electric air pump also includes a housing 5, and the electric cylinder assembly 1, circuit board 2, and air supply assembly 3 are all fixedly connected inside the housing 5. The housing 5 is used to provide a protective structure for the electric cylinder assembly 1, circuit board 2, and air supply assembly 3. A control button is provided on one side of the housing 5. The control button is electrically connected to the circuit board 2. The user can adjust the pumping speed of the electric cylinder assembly 1 through the control button.

[0042] In this embodiment, the small electric air pump also includes a battery, which is fixedly connected inside the housing 5 and electrically connected to the circuit board 2. The battery is a lithium battery and can be charged through the circuit board 2. The battery charges the circuit board 2, the electric cylinder assembly 1, and the air pressure sensor 4.

[0043] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A small electric air pump characterized by comprising: The small electric air pump comprises an electric cylinder assembly, a circuit board, a gas supply assembly and a gas pressure sensor, one end of the electric cylinder assembly is fixedly connected with one end of the gas supply assembly and is in communication, the other end of the gas supply assembly is used for being connected with an external air charging article, the gas pressure sensor is fixedly connected to one side of the gas supply assembly and is in communication with the gas supply assembly, and the circuit board is electrically connected with the electric cylinder assembly and the gas pressure sensor.

2. The small electrically driven gas pump according to claim 1, characterized in that One side of the buffer cylinder is provided with a placing groove in communication with the buffer cavity, and the gas pressure sensor is accommodated in the placing groove.

3. The small electrically driven gas pump according to claim 1, characterized in that One end of the buffer cylinder is provided with a connecting port in communication with the buffer cavity, and the connecting port is fixedly connected with the gas nozzle and is in communication.

4. The small electrically driven gas pump according to claim 1, characterized in that The electric cylinder assembly comprises a fixed frame, a first transmission wheel, a piston assembly and a driving device, one end of the fixed frame is provided with a cylinder body, one end of the cylinder body is fixedly connected with one end of the gas supply assembly and is in communication, one end of the piston assembly is sealingly and slidingly connected in the cylinder body, the other end of the piston assembly is eccentrically rotatably connected with one side of the first transmission wheel, the central shaft of the first transmission wheel is rotatably connected with the fixed frame, the driving device is fixedly connected to the other side of the fixed frame, and the rotating shaft of the driving device is drivingly connected with the first transmission wheel.

5. The small electrically driven gas pump according to claim 4, characterized in that The piston assembly comprises a sealing member and a pushing rod, the outer side wall of the sealing member is sealingly and slidingly connected with the inner side wall of the cylinder body, one end of the pushing rod is embedded in the sealing member, and the other end of the pushing rod is eccentrically rotatably connected with one side of the first transmission wheel.

6. The small electrically driven gas pump according to claim 5, characterized in that The sealing member is provided with an embedding groove, one end of the pushing rod is provided with an embedding block, and the embedding block is accommodated in the embedding groove.

7. The small electrically driven gas pump according to claim 1, characterized in that The small electric air pump further comprises a shell, and the electric cylinder assembly, the circuit board and the gas supply assembly are fixedly connected in the shell.

8. The small electrically driven gas pump according to claim 7, characterized in that The small electric air pump further comprises a battery, and the battery is fixedly connected in the shell and is electrically connected with the circuit board.

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