Piston for electric air pump and air cylinder piston structure

Abstract

A piston for an electric air pump comprises a piston rod and a piston head, the piston head is installed at the front end of the piston rod, an air inlet is formed in the piston head, and a first flexible diaphragm only allowing air to flow from back to front is arranged at the air inlet. The one-way sealing ring comprises an embedded part capable of being installed on the peripheral side of the piston head and a lip part formed by extending outwards and forwards. The hydraulic cylinder has the advantages that when the piston head moves forwards, the one-way sealing ring can seal a gap between the peripheral side of the piston head and the inner wall of the cylinder sleeve; when the piston head moves backwards, a certain gap is formed between the peripheral side of the piston head and the inner wall of the cylinder sleeve through the one-way sealing ring, so that gas conveniently enters the cylinder sleeve of the air cylinder, the speed of air suction in the cylinder sleeve of the air cylinder is higher, and then the current load of the electric air pump is reduced; the abrasion degree of the one-way sealing ring and the inner wall of the cylinder sleeve is reduced, and assembling of the one-way sealing ring is facilitated.

Description

Technical Field

[0001] The utility model relates to an electric air pump, in particular to a piston and a cylinder piston structure for an electric air pump. Background Art

[0002] An electric air pump is a device used to fill a target object with gas. The working principle of the electric air pump is to generate an air flow through mechanical movement (such as piston movement) or other means, and transport the gas to the target object to fill it with gas. At present, the existing piston-type electric air pump is provided with a cylinder piston structure, and the cylinder piston structure is connected to a joint with an inflation port. Among them, the cylinder piston structure includes a cylinder and a piston. The cylinder liner of the cylinder is provided with an air inlet and an air outlet, and the air outlet is communicated with the inflation port of the joint. A check valve structure that only allows external gas to enter the cylinder liner is provided at the air inlet, and a check valve structure that only allows the gas in the cylinder liner to be discharged to the inflation port is provided at the air outlet. The piston is connected to the driving mechanism of the electric air pump, and the driving mechanism can drive the piston to reciprocate in the cylinder liner for inflation. The existing piston and cylinder piston structure for an electric air pump is shown in the Chinese utility model with the patent application number CN201020181548.8 (the authorized announcement number is CN201671788U). A sealing ring is provided between the circumferential side of the piston and the inner wall of the cylinder liner to prevent the gas in the cylinder liner from flowing out.

[0003] Although the above cylinder piston structure uses a sealing ring to seal between the piston and the cylinder liner, the sealing ring is a rigid open ring. When the piston reciprocates in the cylinder liner, the sealing ring will move with the piston, resulting in a certain amount of wear on the rigid sealing ring, thereby affecting the mechanical efficiency of the cylinder piston structure in the electric air pump. In addition, it is difficult to assemble the rigid sealing ring between the piston and the cylinder liner, which affects the production efficiency of the electric air pump. In addition, the check valve structure at the air outlet of the above cylinder liner is arranged in the joint, making the assembly of the joint and the cylinder piston structure more troublesome. And the check valve structure in the above cylinder piston structure is a flexible diaphragm, and the flexible diaphragm is directly installed on the piston, and the situation of the flexible diaphragm coming off may occur, thereby affecting the use effect of the cylinder piston structure. Therefore, further improvements are made to the piston and cylinder piston structure for an electric air pump. Summary of the Invention

[0004] The first technical problem to be solved by the utility model is to provide a piston for an electric air pump with a reasonable structure and capable of improving the air pumping efficiency in view of the above-mentioned prior art status.

[0005] The technical solution adopted by the present utility model to solve the above technical problems is as follows: The piston for an electric air pump includes a piston rod and a piston head. The piston head is installed at the front end of the piston rod. An air inlet is provided on the piston head, and a first flexible diaphragm that only allows gas to flow from the rear to the front is provided at the air inlet. It is characterized in that: it further includes a flexible one-way sealing ring. The one-way sealing ring includes an embedding part that can be installed on the circumferential side of the piston head and a lip part that extends outward and forward.

[0006] In order to stably fix the first flexible diaphragm on the piston head, preferably, it further includes a first screw. The first screw fixes the first flexible diaphragm on the front end face of the piston head, so that the first flexible diaphragm can cover the air inlet. The first screw makes the first flexible diaphragm more stably installed on the front end face of the piston head, thereby better covering the air inlet and making the air pumping efficiency of the electric air pump higher.

[0007] Furthermore, a first gasket is provided on the first screw. The first gasket can abut against the front end face of the first flexible diaphragm. The first gasket has a larger contact area with the first flexible diaphragm than the first screw, thereby effectively preventing the first flexible diaphragm from falling off during the gas flow process.

[0008] In order to make the piston head inhale air faster, preferably, the air inlets are uniformly arranged on the piston head along the circumference. Multiple air inlets make the piston head inhale air faster, and in this way, the contact area between the first flexible diaphragm and the front end face of the piston head is large, making the first flexible diaphragm fit more firmly with the front end face of the piston head.

[0009] Compared with the prior art, the advantages of the present utility model are as follows: A flexible one-way sealing ring is provided on the circumferential side of the piston head. The one-way sealing ring is installed on the circumferential side of the piston head through the embedding part, and the lip part that extends outward and forward can abut against the cylinder liner to seal. That is, when the piston head moves forward, the first flexible diaphragm covers the air inlet under the action of the gas in the cylinder liner, thereby preventing the gas in the cylinder liner from flowing out. The gas in the cylinder liner expands the flexible lip part outward, so that the lip part abuts against the inner wall of the cylinder liner, and further seals the gap between the circumferential side of the piston head and the inner wall of the cylinder liner to avoid the gas in the cylinder liner from flowing out; when the piston head moves backward, under the action of the external gas, there is a certain gap between the first flexible diaphragm and the air inlet, so that the external gas flows into the cylinder liner through the air inlet for inhalation. At this time, the external gas contracts the flexible lip part inward, so that there is a certain gap between the lip part and the inner wall of the cylinder liner on the circumferential side of the piston head, thereby facilitating the gas to enter the cylinder liner, making the inhalation speed of the gas in the cylinder liner faster, and further reducing the current load of the electric air pump. And this one-way sealing ring is a flexible part. When the one-way sealing ring moves back and forth with the piston head, the wear degree of the one-way sealing ring and the inner wall of the cylinder liner is reduced, which is convenient for the assembly of the one-way sealing ring.

[0010] The second technical problem to be solved by the present utility model is to provide a cylinder piston structure for an electric air pump with a reasonable structure and simple assembly in view of the above-mentioned prior art status quo.

[0011] The technical solution adopted by the present utility model to solve the above technical problems is as follows: The cylinder piston structure for the electric air pump includes a cylinder liner. An air outlet is provided at the front end of the cylinder liner, and a second flexible diaphragm that only allows the gas in the cylinder liner to be discharged is provided at the air outlet. It is characterized in that: the above-mentioned piston for the electric air pump is provided in the cylinder liner. The piston head is installed in the cylinder liner from the rear end of the cylinder liner, and the piston head can move back and forth in the cylinder liner. The periphery of the piston head is sealed with the inner wall of the cylinder liner through a one-way sealing ring. In the state where the piston head moves forward, the lip portion abuts against the inner wall of the cylinder liner. In the state where the piston head moves backward, there is a gap between the lip portion and the inner wall of the cylinder liner.

[0012] In order to enable the second flexible diaphragm to be stably arranged at the air outlet, preferably, a second screw is further included. The second screw fixes the second flexible diaphragm on the front end face of the cylinder liner, so that the second flexible diaphragm can cover the air outlet. The second screw enables the second flexible diaphragm to be more stably installed on the front end face of the cylinder liner, thereby better covering the air outlet and making the air pumping efficiency of the electric air pump higher.

[0013] Furthermore, a second gasket is provided on the second screw, and the second gasket can abut against the front end face of the second flexible diaphragm. The contact area of the second gasket with the second flexible diaphragm is larger than that of the second screw, thereby effectively preventing the second flexible diaphragm from falling off during the gas flow process.

[0014] In order to enable the electric air pump to inflate, preferably, a joint is provided at the front end of the cylinder liner. The joint is provided with an inflation port, and the inflation port is communicated with the air outlet. Since the second flexible diaphragm is installed on the cylinder liner, the assembly of the joint and the cylinder piston structure is more convenient.

[0015] Compared with the prior art, the advantages of the present utility model are as follows: The cylinder piston structure intakes air through the air inlet of the piston head and discharges air through the air outlet at the front end of the cylinder liner. That is, when the cylinder piston structure inhales air, the piston head moves backward, the first flexible diaphragm opens, and the second flexible diaphragm closes. The gas flows from the opening at the rear end of the cylinder liner through the air inlet of the piston head into the cylinder liner; when the cylinder piston structure inflates, the piston head moves forward, the second flexible diaphragm opens, and the first flexible diaphragm closes, thereby ensuring that the gas in the cylinder liner can be fully extruded by the piston head to inflate the inflation device, and further greatly improving the inflation efficiency of the electric air pump. And the periphery of the piston head and the inner wall of the cylinder liner are sealed by a one-way sealing ring. In the state where the piston head moves forward, the gas in the cylinder liner causes the lip portion to expand outward, so that the lip portion abuts against the inner wall of the cylinder liner, and further seals the periphery of the piston head and the inner wall of the cylinder liner. In the state where the piston head moves backward, the external gas causes the lip portion to contract inward, so that there is a gap between the lip portion and the inner wall of the cylinder liner, facilitating the external gas to flow into the cylinder liner and improving the working efficiency of the cylinder piston structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of Embodiment 1 of the present utility model;

[0017] Figure 2 is Figure 1 a cross-sectional view of;

[0018] Figure 3 is an exploded schematic diagram of the first flexible diaphragm and the first screw in Embodiment 1 of the present utility model;

[0019] Figure 4 is a schematic structural diagram of Embodiment 2 of the present utility model;

[0020] Figure 5 is Figure 4 a cross-sectional view of;

[0021] Figure 6 is an exploded schematic diagram of the second flexible diaphragm and the second screw in Embodiment 2 of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] As Figures 1 to 3 shown, it is Embodiment 1 of the present utility model.

[0024] As Figures 1 to 3As shown in the figure, the piston for an electric air pump according to this embodiment includes a piston rod 1, a piston head 2, and a flexible one-way sealing ring 3. The piston head 2 is installed at the front end of the piston rod 1. An air inlet 21 is provided on the piston head 2, and the air inlets 21 are evenly arranged along the circumference of the piston head 2. A first flexible diaphragm 4 that only allows gas to flow from the rear to the front is provided at the air inlet 21. The one-way sealing ring 3 includes an embedding portion 31 that can be installed on the peripheral side of the piston head 2 and a lip portion 32 that extends outward and forward.

[0025] As Figure 3 shown in the figure, the piston for an electric air pump according to this embodiment further includes a first screw 5. The first screw 5 fixes the first flexible diaphragm 4 on the front end face of the piston head 2, so that the first flexible diaphragm 4 can cover the air inlet 21. And a first gasket 51 is provided on the first screw 5, and the first gasket 51 can abut against the front end face of the first flexible diaphragm 4.

[0026] As Figures 4 to 6 shown in the figure, Embodiment 2 of the present utility model.

[0027] As Figure 4 and Figure 5 shown in the figure, the cylinder piston structure for an electric air pump according to this embodiment includes a cylinder sleeve 6 and a joint 9. An air outlet 61 is provided at the front end of the cylinder sleeve 6. A second flexible diaphragm 7 that only allows the gas in the cylinder sleeve 6 to be discharged is provided at the air outlet 61. The piston for an electric air pump according to Embodiment 1 is provided in the cylinder sleeve 6. The piston head 2 is installed in the cylinder sleeve 6 from the rear end of the cylinder sleeve 6, and the piston head 2 can move back and forth in the cylinder sleeve 6. The periphery of the piston head 2 is sealed with the inner wall of the cylinder sleeve 6 through the one-way sealing ring 3. In the state where the piston head 2 moves forward, the lip portion 32 abuts against the inner wall of the cylinder sleeve 6. In the state where the piston head 2 moves backward, there is a gap between the lip portion 32 and the inner wall of the cylinder sleeve 6. In addition, the joint 9 of this embodiment is provided at the front end of the cylinder sleeve 6, and the joint 9 is provided with an inflation port 91, and the inflation port 91 is communicated with the air outlet 61.

[0028] As Figure 6 shown in the figure, the cylinder piston structure for an electric air pump according to this embodiment further includes a second screw 8. The second screw 8 fixes the second flexible diaphragm 7 on the front end face of the cylinder sleeve 6, so that the second flexible diaphragm 7 can cover the air outlet 61. And a second gasket 81 is provided on the second screw 8, and the second gasket 81 can abut against the front end face of the second flexible diaphragm 7.

[0029] The working process of this embodiment is as follows:

[0030] A. When the cylinder piston structure of the electric air pump inhales air, the inside of the cylinder liner 6 is in a vacuum state at this time, and the second flexible diaphragm 7 covers the air outlet 61. Then the piston head 2 moves backward. Under the action of the external gas, the first flexible diaphragm 4 has a certain gap between the first flexible diaphragm 4 and the air inlet 21, so that the external gas flows into the cylinder liner 6 through the air inlet 21. And at this time, the external gas makes the flexible lip 32 contract inward, and there is a certain gap between the lip 32 of the one-way sealing ring 3 and the inner wall of the cylinder liner 6. The external gas can also enter the cylinder liner 6 through this gap, making the air intake efficiency of the cylinder piston structure of the electric air pump higher, thus completing the air intake process;

[0031] B. When the cylinder piston structure of the electric air pump inflates, at this time the first flexible diaphragm 4 covers the air inlet 21 under the action of the gas inside the cylinder liner 6, that is, the gas inside the cylinder liner 6 cannot flow out from the air inlet 21. And under the action of the gas inside the cylinder liner 6, the flexible lip 32 expands outward, so that the lip 32 abuts against the inner wall of the cylinder liner 6, and then seals the gap between the circumferential side of the piston head 2 and the inner wall of the cylinder liner 6 to prevent the gas inside the cylinder liner 6 from flowing out. Then the piston head 2 moves forward. Under the action of the gas inside the cylinder liner 6, the second flexible diaphragm 7 opens, that is, there is a certain gap between the second flexible diaphragm 7 and the air outlet 61. The gas inside the cylinder liner 6 flows into the inflation device after passing through the air outlet 61 and the inflation port 91 in sequence, thus completing the inflation process.

Claims

1. A piston for an electric air pump, comprising a piston rod (1) and a piston head (2), wherein the piston head (2) is mounted at the front end of the piston rod (1), an air inlet (21) is provided on the piston head (2), and a first flexible diaphragm (4) is provided at the air inlet (21) for only allowing gas to flow from back to front, characterized in that: It also comprises a flexible one-way sealing ring (3), which comprises an embedded portion (31) that can be installed on the peripheral side of the piston head (2) and a lip portion (32) that extends outward and forward.

2. The piston for an electric air pump according to claim 1, characterized in that: It also includes a first screw (5), which fixes the first flexible diaphragm (4) on the front end surface of the piston head (2) so that the first flexible diaphragm (4) can cover the air inlet (21).

3. The piston for an electric air pump according to claim 2, characterized in that: The first screw (5) is provided with a first gasket (51), and the first gasket (51) can abut against the front end surface of the first flexible diaphragm (4).

4. The piston for an electric air pump according to claim 1, characterized in that: The air inlets (21) are evenly arranged along the circumference on the piston head (2).

5. A cylinder piston structure for an electric air pump, comprising a cylinder sleeve (6), a gas outlet (61) being provided at the front end of the cylinder sleeve (6), a second flexible diaphragm (7) being provided at the gas outlet (61) for only allowing gas in the cylinder sleeve (6) to be discharged, characterized in that: The cylinder sleeve (6) is provided with a piston for an electric air pump as described in any one of claims 1 to 4, the piston head (2) is installed in the cylinder sleeve (6) from the rear end of the cylinder sleeve (6), the piston head (2) can move forward and backward in the cylinder sleeve (6), the peripheral side of the piston head (2) and the inner wall of the cylinder sleeve (6) are sealed by a one-way sealing ring (3), when the piston head (2) moves forward, the lip (32) abuts against the inner wall of the cylinder sleeve (6), and when the piston head (2) moves backward, there is a gap between the lip (32) and the inner wall of the cylinder sleeve (6).

6. The cylinder piston structure for an electric air pump according to claim 5, characterized in that: It also includes a second screw (8), which fixes the second flexible diaphragm (7) on the front end surface of the cylinder sleeve (6) so that the second flexible diaphragm (7) can cover the air outlet (61).

7. The cylinder piston structure for an electric air pump according to claim 6, characterized in that: The second screw (8) is provided with a second gasket (81), and the second gasket (81) can abut against the front end surface of the second flexible diaphragm (7).

8. The cylinder piston structure for an electric air pump according to claim 5, characterized in that: The front end of the cylinder sleeve (6) is provided with a joint (9), and the joint (9) is provided with an air charging port (91), and the air charging port (91) is communicated with the air outlet (61).

Images