Air compression unit for air compression equipment

Abstract

The utility model discloses an air compression unit for air compression equipment, which comprises an air cylinder shell body, a first air cylinder and a second air cylinder which are oppositely arranged are arranged in the air cylinder shell body, and a first piston which reciprocates along the axial direction to form a first pressure stage is arranged in the first air cylinder. A first piston which reciprocates in the axial direction to form a first pressure stage is arranged in the first air cylinder, a second piston which reciprocates in the axial direction to form a second pressure stage is arranged in the second air cylinder, and a pressure medium channel for conveying compressed air from the first pressure stage to the second pressure stage is arranged on the air cylinder shell body. By means of the structure mode, the temperature of compressed air entering the second pressure stage can be reduced, the heat dissipation effect is better compared with the mode that a pressure medium channel is arranged at other positions, and the air compression efficiency is improved; and the pressure medium channel is integrally arranged on the cylinder shell body, and the body of the end cover forms the air outlet path in a space-saving manner, so that the processing and manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air compression devices, and particularly relates to an air compression unit for an air compression device. Background Art

[0002] Air compression devices have been widely applied to vehicles, mainly providing compressed gas for air spring vehicles with air suspension systems to enable the vehicles to have better passability; the air compression unit is the mechanism for an air compression device to generate compressed air; the air compression unit (double piston machine) has two compression stages, a first pressure stage and a second pressure stage, and the gas pressure gradually rises from the first pressure stage (low pressure stage) to the second pressure stage. If the temperature of the compressed air entering the second pressure stage is relatively high, it will directly or indirectly affect the compression efficiency. Secondly, the pressure medium channels of the first pressure stage and the second pressure stage are usually arranged inside the cylinder, resulting in high manufacturing difficulty and cost of the air compression unit. Summary of the Utility Model

[0003] Therefore, the utility model provides an air compression unit for an air compression device to solve the above defects in the prior art.

[0004] An air compression unit for an air compression device includes a cylinder housing body. An opposed first cylinder and second cylinder are constructed inside the cylinder housing body. A first piston that reciprocates axially is arranged inside the first cylinder to form a first pressure stage, and a second piston that reciprocates axially is arranged inside the second cylinder to form a second pressure stage. The pressure medium channel for the first pressure stage to convey compressed air to the second pressure stage is arranged on the cylinder housing body.

[0005] Preferably, the pressure medium channel is arranged along the outer wall surface of the cylinder housing body.

[0006] Preferably, the pressure medium channel has an input port and an output port that is in gas circuit communication with the input port. The input port is constructed on the bottom end surface of the cylinder housing body, and the output port is constructed on the upper end surface of the air chamber of the second cylinder.

[0007] Preferably, an end cover is arranged on the bottom end surface of the cylinder housing body. An air outlet gas path is formed inside the end cover. The air outlet gas path includes a first port and a second port that is in gas circuit communication with the first port. The compressed air generated by the first pressure stage enters through the first port and enters the input port through the second port. A one-way intake valve piece one is arranged at the position of the end cover corresponding to the second port.

[0008] Preferably, a one-way intake valve plate II is provided at the upper end of the second cylinder corresponding to the output port, and the one-way intake valve plate II is used to control the one-way entry of the gas in the pressure medium passage into the second cylinder.

[0009] Preferably, a recessed area with an outer contour consistent with the shape of the one-way intake valve plate I is formed on the bottom end surface of the first cylinder corresponding to the position of the one-way intake valve plate I, and the recessed area is used to provide a clearance space for the one-way intake valve plate I to open.

[0010] Preferably, the pressure medium passage is integrally formed on the cylinder housing body.

[0011] Preferably, a first passage communicating with the air drying unit is further constructed on the second cylinder, the air compressed to the second pressure stage enters the air drying unit through the first passage, and a one-way exhaust valve is provided on the first passage.

[0012] Preferably, the cylinder housing body is integrally formed.

[0013] Preferably, the cylinder diameter of the first cylinder is larger than that of the second cylinder.

[0014] The utility model has the following advantages:

[0015] In the utility model, the pressure medium passage for conveying compressed gas is arranged on the cylinder housing body. This structural form is conducive to reducing the gas temperature of the compressed gas entering the second pressure stage, has better heat dissipation effect compared with the case where the pressure medium passage is arranged at other positions, and improves the efficiency of air compression; moreover, the pressure medium passage is integrally formed and arranged on the cylinder housing body, and the body of the end cover is formed with an air outlet passage in a space-saving manner, both of which reduce the processing and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the internal structure of the pressure medium passage arranged in the cylinder housing body in an embodiment of the utility model;

[0017] Figure 2 is a schematic diagram of the external structure of the cylinder housing body in an embodiment of the utility model;

[0018] Figure 3 is the utility model Figure 1 schematic diagram of the structure of the output port and the first passage position;

[0019] Figure 4 is the utility model Figure 3 schematic diagram of the structure with a one-way intake valve plate II installed at the output port part;

[0020] Figure 5It is a schematic structural diagram of the end cover in the embodiment of the utility model;

[0021] Figure 6 is the utility model Figure 5 The schematic cross-sectional structure of the end cover.

[0022] In the figure:

[0023] 1. First cylinder; 2. Second cylinder; 3. Pressure medium channel; 4. Cylinder shell body; 5. Input port; 6. Depression area; 7. Output port; 8. First channel; 9. End cover; 9-1 First port, 9-2 Second port, 10. One-way air intake valve plate one; 11. One-way air intake valve plate two. Specific embodiments

[0024] In order to make the technical means, creative features, achieved purposes and effects realized by the utility model easy to understand, the utility model will be further described below in conjunction with specific embodiments.

[0025] This embodiment provides an air compression unit for an air compression device, which is a common component of the air compression device. It is configured with a driving motor (not shown in the figure) for driving the piston of the piston machine to reciprocate. The driving motor can be a brushless motor or a brushed motor, as well as other power sources capable of driving the piston machine. And the air compression unit is also configured with an air filtration unit (not shown in the figure) for filtering compressed air.

[0026] As Figures 1 to 6 shown, an air compression unit for an air compression device provided by the utility model improves the compression efficiency to a certain extent. It includes a cylinder shell body 4, and the cylinder shell body 4 is of a shell structure. Usually, when manufacturing, a metal or alloy with a certain strength is selected for integral molding to ensure its certain structural strength. In this embodiment, the cylinder shell body 4 is made of aluminum alloy and its metal surface is treated, usually by hard anodizing treatment.

[0027] The cylinder shell body 4 is internally constructed with a first cylinder 1 and a second cylinder 2 arranged oppositely. A first piston (not shown in the figure) that reciprocates axially is arranged in the first cylinder 1 to form a first pressure stage, and a second piston (not shown in the figure) that reciprocates axially is arranged in the second cylinder 2 to form a second pressure stage. The first pressure stage is a low-pressure stage, and the second pressure stage is a high-pressure stage. Preferably, the cylinder diameter of the first cylinder 1 is larger than that of the second cylinder 2. Usually, the low-pressure stage is the first compression of air, which can also be understood as pre-compression, and the high-pressure stage is the secondary compression of the air compressed by the low-pressure stage.

[0028] As Figure 1As shown, the arrow marks the flow direction of compressed air from the first pressure stage to the second pressure stage. In the embodiment of the present invention, the pressure medium passage 3 for delivering compressed air from the first pressure stage to the second pressure stage is arranged on the cylinder housing body 4. Thus, it can be known that during the process of delivering compressed gas from the low-pressure stage to the high-pressure stage, to a certain extent, the cylinder housing body 4 physically cools the temperature of its compressed air, improving the air compression efficiency of the second cylinder 2; the pressure medium passage 3 should, if permitted, have as long a distance as possible to enhance the effect of physical cooling.

[0029] Based on the above solution, preferably, the pressure medium passage 3 is arranged along the outer wall surface of the cylinder housing body 4. Arranging it on the outer wall surface is more conducive to the physical heat dissipation of the pressure medium passage 3, further reducing the temperature of the compressed gas entering the second cylinder 2. For the purpose of convenient processing and manufacturing and high integration, the pressure medium passage 3 is integrally formed on the cylinder housing body 4.

[0030] In the embodiment of the present invention, the pressure medium passage 3 has an input port 5 and an output port 7 that is in gas circuit communication with the input port 5. The input port 5 is constructed on the bottom end surface of the cylinder housing body 4, and the output port 7 is constructed on the upper end surface of the air chamber of the second cylinder 2.

[0031] Furthermore, a end cover 9 is provided on the bottom end surface of the cylinder housing body 4. An air outlet gas circuit is formed inside the end cover 9. The air outlet gas circuit includes a first port 9-1 and a second port 9-2 that is in gas circuit communication with the first port 9-1. The compressed air generated by the first pressure stage enters through the first port 9-1 and enters the input port 5 through the second port 9-2. A one-way intake valve piece 10 is provided at the position of the end cover 9 corresponding to the second port 9-2.

[0032] Preferably, the one-way intake valve piece 10 is detachably fixed to the end cover 9 by a fastener for easy replacement in the later stage; a recessed area 6 with an outer contour consistent with the shape of the one-way intake valve piece 10 is formed on the bottom end surface of the first cylinder 1 corresponding to the position of the one-way intake valve piece 10. The recessed area 6 is used to provide an avoidance space for the one-way intake valve piece 10 to open. Specifically:

[0033] When the one-way intake valve piece 10 is subjected to the pressure of the pre-compressed air generated by the first pressure stage, it pushes open the one-way intake valve piece 10 to cause it to undergo elastic deformation. In this way, the pre-compressed air enters the pressure medium passage 3. When the one-way intake valve piece 10 undergoes elastic deformation, it will shift towards the recessed area 6.

[0034] In an embodiment of the present utility model, a check air intake valve piece II 11 is provided at the upper end of the second cylinder 2 corresponding to the output port 7, and the check air intake valve piece II 11 is used to control the unidirectional entry of the gas in the pressure medium passage 3 into the second cylinder 2.

[0035] A first passage 8 communicating with an air drying unit (not shown in the figure) is further constructed on the second cylinder 2. The air compressed to the second pressure stage enters the air drying unit through the first passage 8, and a check exhaust valve (not shown in the figure) is provided on the first passage 8.

[0036] The working process of the present embodiment is as follows: When the first pressure stage is working, it experiences the processes of suction, compression, and discharge. Air (free air) enters the first cylinder 1 (suction process), is compressed by the first piston, and the compressed air passes from the first port 9-1 to the second port 9-2, pneumatically pushes open the check air intake valve piece I 10, enters the input port 5, is cooled through the pressure medium passage 3, reaches the output port 7, and pneumatically pushes open the check air intake valve piece II 11 to enter the second cylinder 2; it is continuously compressed by the second pressure stage, and the compressed air enters the air drying unit through the first passage 8 via the check exhaust valve, and is directly or indirectly configured on pneumatic equipment after being filtered.

[0037] The pressure medium passage for conveying compressed gas in the present utility model is arranged on the cylinder housing body. This structural method is conducive to reducing the gas temperature of the compressed gas entering the second pressure stage, has a better heat dissipation effect compared to the case where the pressure medium passage is arranged at other positions, and improves the efficiency of air compression; moreover, the pressure medium passage is integrally formed and arranged on the cylinder housing body, and the body of the end cover is formed with an air outlet passage in a space-saving manner, both of which reduce the manufacturing cost.

[0038] Although the present utility model has been described in detail above with general descriptions and specific embodiments, based on the present utility model, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present utility model all fall within the scope of protection required by the present utility model.

Claims

1. An air compression unit for air compression equipment, comprising a cylinder housing body (4), wherein a first cylinder (1) and a second cylinder (2) arranged opposite to each other are constructed in the cylinder housing body (4), wherein a first piston is arranged in the first cylinder (1) to reciprocate along the axial direction to form a first pressure level, and a second piston is arranged in the second cylinder (2) to reciprocate along the axial direction to form a second pressure level, characterized in that: A pressure medium channel (3) through which the first pressure stage delivers compressed air to the second pressure stage is arranged on the cylinder housing body (4).

2. The air compression unit for air compression equipment according to claim 1, characterized in that: The pressure medium channel (3) is arranged along the outer wall surface of the cylinder shell body (4).

3. The air compression unit for air compression equipment according to claim 1, characterized in that: The pressure medium channel (3) has an input port (5) and an output port (7) connected to the input port (5) by an air path, wherein the input port (5) is constructed on the bottom end surface of the cylinder shell body (4), and the output port (7) is constructed on the upper end surface of the air chamber of the second cylinder (2).

4. The air compression unit for air compression equipment according to claim 3, characterized in that: The bottom end surface of the cylinder shell body (4) is provided with an end cover (9), and an air outlet path is formed in the body of the end cover (9), and the air outlet path includes a first port (9-1) and a second port (9-2) connected to the first port (9-1). The compressed air generated by the first pressure level enters through the first port (9-1) and enters the input port (5) through the second port (9-2). A one-way air intake valve plate (10) is provided at the portion of the end cover (9) corresponding to the second port (9-2).

5. The air compression unit for air compression equipment according to claim 3, characterized in that: A one-way air intake valve plate 2 (11) is provided at the upper end of the second cylinder (2) corresponding to the output port (7), and the one-way air intake valve plate 2 (11) is used to control the gas in the pressure medium channel (3) to enter the second cylinder (2) in one direction.

6. The air compression unit for air compression equipment according to claim 4, characterized in that: A recessed area (6) having an outer contour consistent with the shape of the one-way air intake valve plate (10) is formed on the bottom end surface of the first cylinder (1) corresponding to the position of the one-way air intake valve plate (10), and the recessed area (6) is used to provide an escape space for the one-way air intake valve plate (10) to open.

7. The air compression unit for air compression equipment according to claim 1, characterized in that: The pressure medium channel (3) is integrally formed on the cylinder shell body (4).

8. The air compression unit for air compression equipment according to claim 1, characterized in that: The second cylinder (2) is also provided with a first channel (8) connected to the air drying unit, and the air compressed at the second pressure level enters the air drying unit through the first channel (8), and a one-way exhaust valve is provided on the first channel (8).

9. The air compression unit for air compression equipment according to claim 1, characterized in that: The cylinder shell body (4) is manufactured in one piece.

10. The air compression unit for air compression equipment according to claim 1, characterized in that: The cylinder diameter of the first cylinder (1) is larger than the cylinder diameter of the second cylinder (2).

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