Preparation method of durable cylinder barrel for air pump and durable air cylinder for air pump

Abstract

The present invention discloses a preparation method of a durable cylinder barrel for an air pump and a durable cylinder for an air pump, belonging to the technical field of variable volume machinery, and comprising the following steps: (1) manufacturing a cylinder liner with profiles; (2) manufacturing a cylinder barrel body with an inner cavity by means of casting, and arranging the cylinder liner manufactured in step (1) in the inner cavity to form a cylinder barrel, and heat dissipation fins integrally formed with the cylinder barrel body are arranged on the outer wall of the cylinder barrel body; (3) after polishing the inner wall of the cylinder liner once to a surface roughness ≤ 0.2 μm, at least oxidizing the inner wall of the cylinder liner, and after natural cooling, polishing the inner wall of the cylinder liner again to a surface roughness ≤ 0.2 μm. This cylinder barrel not only enhances the wear resistance of the cylinder barrel, reduces the influence of gaps caused by wear, but also reduces frictional heat generation, can enhance the sealing performance between the piston and the cylinder liner, and is beneficial to improving the working efficiency of the air pump.

Description

Technical Field

[0001] The present invention belongs to the technical field of variable-volume machinery, and particularly relates to a preparation method for a durable cylinder barrel for an air pump and a durable cylinder for an air pump. Background Art

[0002] With the development of automotive industry technology, air suspension technology has become increasingly perfect and is gradually applied to the suspension system of vehicles. It uses an air spring to buffer the vibration from the wheels and adjusts the air pressure of the air spring in real time according to road conditions, thereby changing the softness and hardness of the air spring to enhance the comfort and stability during vehicle driving.

[0003] In practical applications, an air pump is usually used to provide compressed air for the air spring to adjust the elastic coefficient of the air spring. When the air spring needs to be hardened, the air pump works to compress the air and fill it into the air spring; when the air spring needs to be softened, some compressed air is released.

[0004] Currently, there is a problem that the cylinder of the air pump is prone to heat generation, which even affects the sealing performance of the piston, resulting in low working efficiency of the air pump, and the air pump is easily damaged, increasing the maintenance cost for users. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a preparation method for a durable cylinder barrel for an air pump and a durable cylinder for an air pump, which can enhance the wear resistance of the cylinder barrel and reduce friction.

[0006] To solve the above technical problem, the technical solution of the present invention is: designing a preparation method for a durable cylinder barrel for an air pump, which is characterized by including the following steps:

[0007] (1) Preparing a cylinder liner: obtaining a cylinder liner by using profiles;

[0008] (2) Preparing a cylinder barrel: obtaining a cylinder barrel body with an inner cavity by casting, and arranging the cylinder liner obtained in step (1) in the inner cavity to form a cylinder barrel. Heat dissipation fins are provided on the outer wall of the cylinder barrel body and are formed together with the cylinder barrel body;

[0009] (3) Processing the cylinder barrel: polishing the inner wall of the cylinder liner once to a surface roughness ≤ 0.2 microns, then oxidizing at least the inner wall of the cylinder liner, and after natural cooling, polishing the inner wall of the cylinder liner again to a surface roughness ≤ 0.2 microns.

[0010] Further, the deviation between the thermal expansion coefficient of the cylinder liner in step (1) and the thermal expansion coefficient of the cylinder barrel body in step (2) is close to zero.

[0011] Further, the materials of the cylinder liner in step (1) and the cylinder barrel body in step (2) are both aluminum or aluminum alloy.

[0012] Further, in step (2), the cylinder liner is cast in the inner cavity of the cylinder barrel body, or the cylinder liner is press-fitted into the inner cavity of the formed cylinder barrel body with an interference fit.

[0013] The present invention also provides a durable cylinder for an air pump, including a cylinder barrel, characterized in that: the cylinder barrel is the cylinder barrel obtained by the above preparation method.

[0014] Further, a piston is fitted in the cylinder liner, and the piston divides the working chamber of the cylinder liner into a rod chamber and a rodless chamber. The rod chamber communicates with the air inlet, the rodless chamber communicates with the air outlet, a pressure valve is installed on the air outlet, a vent hole is opened on the piston, the vent hole communicates the rod chamber and the rodless chamber, and a valve plate capable of covering the vent hole is provided on the end wall of the piston close to the rodless chamber.

[0015] Further, the pressure valve includes a valve body capable of blocking the air outlet, an elastic body is connected to the valve body, and the other end of the elastic body is fixedly connected to the cylinder barrel body.

[0016] Further, a gas distribution plate is connected to the cylinder barrel body, a gas distribution cavity is formed between the gas distribution plate and the cylinder barrel body, the valve body is located in the gas distribution cavity, a plurality of gas distribution holes penetrating the gas distribution plate are opened on the gas distribution plate, and the other end of the elastic body is connected to the gas distribution plate.

[0017] Further, the gas distribution holes are uniformly distributed on the gas distribution plate.

[0018] Further, a concave hole communicating with the rodless chamber is opened on the bottom wall of the cylinder barrel body.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. Since the cylinder liner in the cavity of the specially-shaped cylinder barrel body formed by casting has been oxidized, it not only enhances the wear resistance of the cylinder barrel, reduces the influence of the gap caused by wear, but also the polished cylinder liner reduces frictional heat generation and alleviates the deformation caused by heat, which can enhance the sealing performance between the piston and the cylinder liner and is beneficial to improving the working efficiency of the air pump; and the heat dissipation fins on the cylinder barrel body contribute to the heat dissipation of the cylinder barrel and help the cylinder barrel to cool down by air cooling.

[0021] 2. Since a cylinder liner with a thermal expansion coefficient close to that of the cylinder barrel body is selected, the same degree of thermal expansion and contraction of the cylinder barrel body and the cylinder liner can be maintained, the integrity of the cylinder barrel can be maintained, and it is beneficial to extend its service life.

[0022] 3. Since both the cylinder barrel body and the cylinder liner are made of aluminum or aluminum alloy with excellent heat dissipation performance and economy, it is beneficial to improve the heat dissipation performance of the cylinder under the premise of reducing costs.

[0023] 4. Since the surface roughness after the first and second polishing is ≤ 0.2 microns, friction heat generation is reduced by decreasing the surface roughness, further maintaining the good working performance of the cylinder.

[0024] 5. Since a valve plate capable of covering the vent hole is provided on the end wall of the piston close to the rodless cavity, the valve plate can be automatically opened and closed depending on the pressure change caused by the piston movement, which is convenient for control and has a compact structure.

[0025] 6. Since a gas distribution plate is connected to the cylinder body, and a gas distribution cavity is formed between the gas distribution plate and the cylinder body, after the compressed air is buffered in the gas distribution cavity, it is evenly supplied through the gas distribution holes, avoiding the situation of excessive local pressure caused by uneven pressure, which is beneficial to extending the service life of the connected equipment.

[0026] 8. Since a concave hole communicating with the working cavity of the cylinder liner is provided on the bottom wall of the cylinder body, it can prevent the piston from tightly adhering to the bottom wall of the cylinder body to form a vacuum state, facilitating the piston to disengage from the bottom wall of the cylinder body.

[0027] 9. The structure of the present invention is simple, overcoming the difficulty of oxidizing the special-shaped cylinder, improving wear resistance while reducing friction heat generation, and facilitating popularization and application in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0029] Figure 2 is Figure 1 the view from direction A of

[0030] Figure 3 is Figure 2 the sectional view taken along line B-B in

[0031] Figure 4 is a three-dimensional structural schematic diagram of the cylinder;

[0032] Figure 5 is Figure 4 the view from direction C of

[0033] Figure 6 is Figure 5 the sectional view taken along line D-D in

[0034] Figure 7 is a three-dimensional structural schematic diagram of the piston;

[0035] Figure 8 is Figure 7 the view from direction E of

[0036] Figure 9 is Figure 8 the sectional view taken along line F-F in

[0037] Markings in the figure: 1, cylinder body; 2, heat dissipation fins; 3, piston rod; 4, air distribution plate; 5, air distribution holes; 6, air distribution cavity; 7, valve body; 8, spring; 9, air outlet; 10, cylinder liner; 11, piston; 12, rod chamber; 13, rodless chamber; 14, concave hole; 15, valve plate; 16, ventilation hole. Detailed implementation mode

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0039] One end of the cylinder body 1 far from the piston rod 3 is defined as the bottom end, and correspondingly, the loading end close to the piston rod 3 is defined as the mouth end.

[0040] As Figure 4 , Figure 5 and Figure 6 shown, the present invention is provided with heat dissipation fins 2 integrally formed with the cylinder body 1 on the outer wall of the cylinder body 1. An inner cavity is provided in the cylinder body 1, and a cylinder liner 10 with a smooth and wear-resistant inner wall is provided in the inner cavity. A concave hole 14 communicating with the working cavity of the cylinder liner 10 is provided on the bottom wall of the cylinder body 1. As Figure 1 , Figure 2 and Figure 3 shown, a piston 11 is fitted in the cylinder liner 10. The piston 11 divides the working cavity of the cylinder liner 10 into a rod chamber 12 and a rodless chamber 13. The rod chamber 12 communicates with the air inlet, and the rodless chamber 13 communicates with the air outlet 9. An air distribution plate 4 is connected to the cylinder body 1. A plurality of air distribution holes 5 penetrating the air distribution plate 4 are provided on the air distribution plate 4. The air distribution holes 5 are evenly distributed on the air distribution plate 4. A air distribution cavity 6 is formed between the air distribution plate 4 and the cylinder body 1. The air outlet 9 communicates with the air distribution cavity 6. A valve body 7 is provided in the air distribution cavity 6. The valve body 7 can block the air outlet 9. A spring 8 is connected to the valve body 7, and the other end of the spring 8 is connected to the air distribution plate 4. As Figure 7 , Figure 8 and Figure 9 shown, a ventilation hole 16 is provided on the piston 11. The ventilation hole 16 communicates the rod chamber 12 and the rodless chamber 13. A valve plate 15 capable of covering the ventilation hole 16 is provided on the end wall of the piston 11 close to the rodless chamber 13.

[0041] The cylinder barrel of the above cylinder is obtained through the following steps:

[0042] (1) Prepare the cylinder liner 10: The cylinder liner 10 is made of profiles;

[0043] (2) Preparation of cylinder barrel: Select a material with a thermal expansion coefficient close to that of the cylinder sleeve 10 in step (1), and prepare a cylinder barrel body 1 with an inner cavity by casting. The cylinder sleeve 10 prepared in step (1) is arranged in the inner cavity to form a cylinder barrel, and the outer wall of the cylinder barrel body 1 is provided with heat dissipation fins 2 formed together with the cylinder barrel body 1. In this step, the cylinder sleeve 10 is cast in the inner cavity of the cylinder barrel body 1 to form a whole, or the cylinder sleeve 10 is inserted into the inner cavity of the formed cylinder barrel body 1 by interference fit.

[0044] (3) Cylinder barrel processing: After the inner wall of the cylinder liner 10 is polished once to a surface roughness of ≤0.2 μm, the inner wall of the cylinder liner 10 is at least oxidized, and after natural cooling, the inner wall of the cylinder liner 10 is polished again to a surface roughness of ≤0.2 μm.

[0045] In order to improve the heat dissipation performance as much as possible while reducing the cost of the cylinder, the materials of the cylinder body 1 and the cylinder sleeve 10 are both selected to be aluminum or aluminum alloy.

[0046] The working process of the present invention is as follows:

[0047] When the piston 11 is pulled out toward the mouth of the cylinder, the valve body 7 is blocked on the air outlet 9. Since the rodless chamber 13 becomes larger and presents a negative pressure state, the pressure of the rod chamber 12 is greater than the pressure of the rodless chamber 13. The valve plate 15 blocked in the air vent 16 is opened, and the gas in the rod chamber 12 enters the rodless chamber 13 through the air vent 16; when the piston 11 is pushed toward the bottom end of the cylinder, the valve plate 15 is closed, and the gas in the rodless chamber 13 is compressed. When the air pressure reaches a certain level and can overcome the elastic force of the spring 8, the valve body 7 is pushed away from the air outlet 9, so that the compressed gas enters the air distribution chamber 6 and is evenly supplied through the air distribution holes 5.

[0048] During the above work process, since the cylinder liner 10 has been oxidized, its hardness is greatly improved and its wear resistance is enhanced. The friction coefficient of the inner wall is greatly reduced after polishing, which reduces the friction between the piston 11 and the friction heat, thereby extending the service life of the cylinder and reducing the frequency of maintenance.

[0049] In addition to the above-mentioned valve body 7 equipped with spring 8 as a pressure valve, other pressure valves can also be used, such as safety relief valves in the prior art, as long as they can open the passage to release compressed gas after reaching the pressure. Similarly, in addition to the spring 8, the elastic body can also be made of elastic objects such as rubber, as long as the force is compressed and it naturally returns to the initial state after the external force constraint is lost.

[0050] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A preparation method of a durable cylinder barrel for an air pump, characterized in that: It includes the following steps: (1) Prepare the cylinder liner: The cylinder liner is made of profiles; (2) Prepare the cylinder barrel: The cylinder barrel body with an inner cavity is obtained by casting. The cylinder liner obtained in step (1) is cast in the inner cavity of the cylinder barrel body. Heat dissipation fins formed together with the cylinder barrel body are provided on the outer wall of the cylinder barrel body; (3) Machine the cylinder barrel: After the inner wall of the cylinder liner is polished once to a surface roughness ≤ 0.2 μm, at least the inner wall of the cylinder liner is oxidized. After natural cooling, the inner wall of the cylinder liner is polished again to a surface roughness ≤ 0.2 μm.

2. The preparation method of the durable cylinder barrel for an air pump according to claim 1, characterized in that: The deviation between the thermal expansion coefficient of the cylinder liner in step (1) and the thermal expansion coefficient of the cylinder barrel body in step (2) is close to zero.

3. The preparation method of the durable cylinder barrel for an air pump according to claim 2, characterized in that: The materials of the cylinder liner in step (1) and the cylinder barrel body in step (2) are both aluminum or aluminum alloy.

4. A durable cylinder for an air pump, comprising a cylinder barrel, characterized in that: The cylinder barrel is the cylinder barrel obtained by the preparation method of the durable cylinder barrel for an air pump according to any one of claims 1 to 3.

5. The durable cylinder for an air pump according to claim 4, characterized in that: A piston is installed in the cylinder liner. The piston divides the working cavity of the cylinder liner into a rod chamber and a rodless chamber. The rod chamber communicates with the air inlet, the rodless chamber communicates with the air outlet. A pressure valve is installed on the air outlet. A ventilation hole is provided on the piston, and the ventilation hole communicates the rod chamber and the rodless chamber. A valve plate capable of covering the ventilation hole is provided on the end wall of the piston close to the rodless chamber.

6. The durable cylinder for an air pump according to claim 5, characterized in that: The pressure valve includes a valve body capable of blocking the air outlet. An elastic body is connected to the valve body, and the other end of the elastic body is fixedly connected to the cylinder barrel body.

7. The durable cylinder for an air pump according to claim 6, characterized in that: An air distribution plate is connected to the cylinder barrel body. An air distribution cavity is formed between the air distribution plate and the cylinder barrel body. The valve body is located in the air distribution cavity. A plurality of air distribution holes penetrating the air distribution plate are provided on the air distribution plate, and the other end of the elastic body is connected to the air distribution plate.

8. The durable cylinder for an air pump according to claim 7, characterized in that: The air distribution holes are evenly distributed on the air distribution plate.

9. The durable cylinder for an air pump according to any one of claims 5 to 8, characterized in that: A concave hole communicating with the rodless chamber is provided on the bottom wall of the cylinder barrel body.

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