Electric air pump capable of preventing air leakage

Abstract

The utility model discloses an anti-leakage electric air pump which comprises a pump shell and motors installed in the pump shell, the front end of the pump shell is provided with an air outlet, the outer side of the air outlet is provided with an inflation connector part for being connected with a connector, the rear end of the pump shell is provided with an air inlet, and the air supply directions of the motors are the same and all face the air outlet; the valve is characterized in that a one-way valve is arranged on the inner side of the air inlet, moves towards the air outlet to open the air inlet, and moves towards the air inlet to close the air inlet. When the motor stops and the inflatable product is still connected with the air pump, the air pressure in the inflatable product can act on the one-way valve, so that the one-way valve moves to close the air inlet or the air outlet, the air in the inflatable product cannot be discharged, and the air leakage protection effect is achieved.

Description

Technical Field

[0001] This utility model relates to a leak-proof electric air pump suitable for inflating inflatable boats, tents, air mattresses and similar inflatable products. Background Technology

[0002] Inflatable products are becoming increasingly popular with consumers due to their portability and ease of storage. Outdoor enthusiasts are increasingly favoring paddleboards, inflatable boats, inflatable tents, and inflatable beds. Existing electric air pumps typically perform both inflation and deflation functions. During inflation, the motor inside the pump drives a centrifugal fan (also called a motor) to fill the product with air; during deflation, the motor drives the centrifugal fan to expel air from the product.

[0003] As shown in the Chinese utility model patent CN202222626860.9 (authorization announcement number CN219622826U) "An Electric Air Pump for Both Pumping and Filling", the electric air pump has a cylindrical shell. The pumping end, impeller, partition, motor and filling end are arranged in sequence along the axial direction of the cylindrical shell. The pumping end is located at the top of the air chamber and the filling end is located at the bottom of the motor chamber. The electric air pump uses a motor to control the rotation of the impeller and connects the product with the pumping end or the filling end, thereby realizing the dual function of pumping and filling.

[0004] Existing electric air pumps have the following problems: When the inflated product reaches its maximum pressure, if the customer does not stop the pump in time and allows it to continue working, the pump motor will overheat, causing the thermal fuse inside the motor to trip and the motor to stop working. To increase air flow, these air pumps generally have a connector that allows the air valve of the inflated product to remain open. Because the pump connector is still connected to the inflated product, the air valve of the inflated product remains open. Once the motor stops, the high-pressure air inside the inflated product is released from the inflation port through the air pump's inlet, causing the inflated product to collapse due to lack of air.

[0005] Therefore, the current electric air pump needs further improvement. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a reasonably structured, leak-proof electric air pump that can prevent high-pressure air inside the inflatable product from being discharged through the air inlet end of the pump even when the motor is stopped and the product is still connected to it.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: an air-proof electric air pump, including a pump housing and a motor installed in the pump housing, an air outlet is provided at the front end of the pump housing, an air inlet is provided on the outer side of the air outlet for connecting a connector, and an air inlet is provided at the rear end of the pump housing, and the air delivery direction of the motor is the same, all facing the air outlet; the feature is that: a one-way valve is provided on the inner side of the air inlet, the one-way valve opens the air inlet when it moves towards the air outlet, and closes the air inlet when it moves towards the air inlet.

[0008] Preferably, the aforementioned one-way valve is a one-way valve plate, or a valve stem held by a spring to maintain a closed tendency.

[0009] To facilitate rapid deflating of inflatable products using this electric air pump, a deflating interface is provided on the outer side of the air inlet for connecting a connector. During deflating, the inflatable product is connected to the deflating interface via the connector, and the motor operates, enabling more efficient and faster deflating of the product.

[0010] As an improvement, the air outlet is equipped with a first grille, and the inflation port is located in front of the first grille. The first grille ensures inflation while preventing larger debris from entering the motor and also prevents fingers from being inserted, thus improving safety. The air inlet is equipped with a second grille, and the suction port is located behind the second grille. The second grille ensures air intake while preventing larger debris from entering the motor and also prevents fingers from being inserted, thus improving safety.

[0011] Further improvements include an outer casing, with the pump housing mounted inside and the inflation port exposed at the front end of the outer casing. Because both the suction and inflation ports are located on the pump housing, rather than on the outer casing, and since the outer casing is typically formed by two half-shells joined together, the sealing requirements at the joints of the outer casing are reduced. No welding or bonding is required; a firm connection between the two is sufficient. This simplifies the assembly process, reduces costs, and does not affect the inflation speed, maximum pressure, or negative pressure.

[0012] Furthermore, the aforementioned outer casing features a downward-extending handle. The handle houses a battery and a first circuit board with a control switch, pressure sensor, and pressure display screen. The pressure sensor communicates with the pump housing cavity via an air duct. The control switch and pressure display screen are located on the handle. The battery, first circuit board, and motor are electrically connected together to form a circuit. The handle design facilitates user grip, and the pressure sensor transmits pressure data to the pressure display screen, allowing the pressure inside the pump housing to be visually displayed. The pressure inside the pump housing is actually the internal air pressure of the inflatable product.

[0013] To facilitate operation of the control switch and observation of the pressure display screen, the aforementioned control switch and pressure display screen are exposed on the rear side wall of the handle.

[0014] Preferably, the battery is a rechargeable battery, and the handle also contains a second circuit board with a charging connector, which is exposed at the bottom of the handle. It can be used wirelessly, making it more convenient to use.

[0015] Compared with existing technologies, the advantages of this invention are as follows: The one-way valve located inside the air inlet ensures that when the motor stops but the inflatable product remains connected to the air pump, the air pressure inside the product acts on the one-way valve, causing it to close either the air inlet or outlet. This prevents air from being released from the inflatable product, providing leakage protection. During normal inflation, the airflow generated by the motor opens the one-way valve, allowing for normal air intake and high-pressure airflow to inflate the product through the outlet. Attached Figure Description

[0016] Figure 1 This is a front perspective view of an embodiment of the present utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the rear side of an embodiment of the present utility model;

[0018] Figure 3 This is a cross-sectional view of an embodiment of the present utility model;

[0019] Figure 4 This is a three-dimensional schematic diagram of the inflation interface connected to the connecting joint in an embodiment of the present invention. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] like Figures 1-4 The image shown is a preferred embodiment of the present invention.

[0022] An air-proof electric air pump includes a pump housing 1 and a motor 2 installed inside the pump housing 1. The pump housing is formed by the mating and fixing of left and right halves. The front end of the pump housing 1 has an air outlet 3a, and the outer side of the air outlet 3a has an inflation interface 5a for connecting a connector 4 (the connector can be of various types, matching the inflation valves on different inflatable products). The rear end of the pump housing 1 has an air inlet 3b. The motor 2 delivers air in the same direction, always towards the air outlet 3a. The inner side of the air inlet 3b has a one-way valve 6. The one-way valve 6 opens the air inlet 3b when moving towards the air outlet 3a and closes the air inlet 3b when moving towards the air inlet 3b. In this embodiment, the one-way valve 6 is a one-way valve plate. When the motor 2 is working, during inflation, air is drawn from the air inlet 3b, opening the one-way valve 6. The air is then pressurized by the motor 2, passes through the air outlet 3a, and enters the inflatable product through the connector 4. After the product is inflated, the motor 2 stops due to the activation of the thermal protection device, and the one-way valve 6 automatically closes, preventing air leakage from the inflated product. The one-way valve 6 is also useful in the following situation: when the air pump has an automatic stop function, the motor 2 stops working after the set pressure is reached, and the inflated product will not leak.

[0023] An air intake 3b is provided on the outer side for connecting the connector 4 to the air extraction port 5b. An air outlet 3a is provided with a first grille 3a1, and the air extraction port 5a is located in front of the first grille 3a1; an air intake 3b is provided with a second grille 3b1, and the air extraction port 5b is located behind the second grille 3b1.

[0024] It also includes an outer casing 7, in which the pump housing 1 is installed, and the inflation port 5a is exposed at the front end of the outer casing 7. The outer casing 7 is formed by joining left and right halves together.

[0025] The outer casing 7 has a downwardly extending handle 71. Inside the handle 71 is a battery 8 and a first circuit board 9a with a control switch 9a1, a pressure sensor 9a2, and a pressure display screen 9a3. There are two buttons on either side of the control switch 9a1, one for setting the pressure unit and the other for setting the pressure. The pressure sensor 9a2 is connected to the inner cavity of the pump housing 1 via an air duct 9a4. The control switch 9a1 and the pressure display screen 9a3 are exposed on the handle. The battery 8, the first circuit board 9a, and the motor 2 are electrically connected to form a circuit. The control switch 9a1 and the pressure display screen 9a3 are exposed on the rear side wall of the handle 71. The battery is a rechargeable battery. The handle 71 also contains a second circuit board 9b with a charging connector 9b1, which is exposed at the bottom of the handle 71. A small round hole next to the charging connector 9b1 is used to check the battery level of the battery 8.

[0026] The operation of air extraction and degassing is similar to that of existing electric air pumps. When the motor stops, but the inflatable product remains connected to the air pump, the air pressure inside the inflatable product acts on the one-way valve 6, causing it to close the air inlet 3b. This prevents air from being expelled from the inflatable product, providing leakage protection. During normal inflation, the airflow generated by the motor 2 causes the one-way valve 6 to open, allowing air inlet 3b to replenish air normally. The high-pressure airflow can then normally inflate the inflatable product through the air outlet.

[0027] It should be noted that in the description of this embodiment, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

Claims

1. A leak-proof electric air pump, comprising a pump housing (1) and a motor (2) installed inside the pump housing (1), wherein the front end of the pump housing (1) is provided with an air outlet (3a), the outer side of the air outlet (3a) is provided with an inflation interface (5a) for connection to a connecting connector (4), and the rear end of the pump housing (1) is provided with an air inlet (3b), wherein the air delivery direction of the motor (2) is the same and faces the air outlet (3a); characterized in that: The air inlet (3b) is provided with a one-way valve (6) inside. The one-way valve (6) opens the air inlet (3b) when it moves towards the air outlet (3a) and closes the air inlet (3b) when it moves towards the air inlet (3b).

2. The leak-proof electric air pump according to claim 1, characterized in that: The one-way valve (6) is a one-way valve plate, or a valve stem held by a spring to maintain a closed tendency.

3. The leak-proof electric air pump according to claim 1, characterized in that: The air inlet (3b) is provided with an air extraction interface (5b) on the outside for connection of the connecting connector (4).

4. The leak-proof electric air pump according to claim 3, characterized in that: The air outlet (3a) is provided with a first grille (3a1), and the air inlet (5a) is located in front of the first grille (3a1); the air inlet (3b) is provided with a second grille (3b1), and the air extraction inlet (5b) is located behind the second grille (3b1).

5. The leak-proof electric air pump according to any one of claims 1 to 4, characterized in that: It also includes an outer casing (7), the pump housing (1) is installed inside the outer casing (7), and the inflation interface (5a) is exposed at the front end of the outer casing (7).

6. The leak-proof electric air pump according to claim 5, characterized in that: The outer casing (7) has a downwardly extending handle (71). Inside the handle (71) is a battery (8) and a first circuit board (9a) with a control switch (9a1), a pressure sensor (9a2) and a pressure display screen (9a3). The pressure sensor (9a2) is connected to the inner cavity of the pump housing (1) through an air duct (9a4). The control switch (9a1) and the pressure display screen (9a3) are exposed at the handle. The battery (8), the first circuit board (9a), and the motor (2) are electrically connected together to form a circuit.

7. The leak-proof electric air pump according to claim 6, characterized in that: The control switch (9a1) and pressure display (9a3) are exposed on the rear sidewall of the handle (71).

8. The leak-proof electric air pump according to claim 6, characterized in that: The battery is a rechargeable battery, and the handle (71) is also provided with a second circuit board (9b) with a charging connector (9b1), and the charging connector (9b1) is exposed at the bottom of the handle (71).

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