An oil-free air compressor

Abstract

The present invention belongs to an air compressor, specifically an oil-free air compressor, which comprises a housing, a piston assembly, a cylinder block, an intermediate cylinder, and a bottom support plate. It is characterized in that the piston assembly comprises two or more pistons with different diameters, the cylinder block comprises two or more cylinders with different diameters, and the diameter of the cylinder can be switched to adapt to different output intensities, reduce the number of shutdowns. The pistons and cylinders with different diameters correspond to different working intensities. Multiple cylinders and pistons share the working pressure, increasing the running time without reducing the service life.

Description

Technical Field

[0001] The present invention belongs to air compressors, and specifically relates to an oil-free air compressor. Background Art

[0002] Air compressors are all composed of a compressor and a gas storage tank. Compressors are mainly divided into oil-type and oil-free types. The compressed air of oil-free air compressors does not contain oil and gas, so they are used in industries such as medical, food, and pharmaceutical.

[0003] Generally, two cylinders of a small-power oil-free air compressor output singly compressed air. After the pressure in the gas storage tank rises to a certain level, the compressor stops, and when the pressure drops to a certain level, it starts again.

[0004] In the case of long-term use, the start-stop frequency of the compressor increases, and the temperature changes frequently, resulting in the failure of the sealing parts. Moreover, the number of current impacts increases, which also leads to a higher failure rate of the motor. However, long-term operation will also cause cylinder wear. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an oil-free air compressor to reduce the start-stop frequency and reduce cylinder wear. The technical solutions are as follows:

[0006] An oil-free air compressor, including a housing, a piston assembly, a cylinder group, an intermediate cylinder, and a bottom support plate, characterized in that the piston assembly includes two or more pistons with different diameters, and the cylinder group includes two or more cylinders with different diameters.

[0007] Further, the cylinder group includes a small-displacement cylinder and a large-displacement cylinder, and the piston assembly includes a piston rod and two pistons with different diameters.

[0008] Further, the intermediate cylinder includes a cylinder body, a large-orifice sealing plate, and a small-orifice sealing plate.

[0009] Further, sliding columns are provided on both sides of the cylinder body, and sliding grooves are provided on the same two sides of the cylinder housing.

[0010] Further, positioning members are provided at the ends of the sliding columns, and positioning grooves are provided on both sides of the sliding grooves of the cylinder housing.

[0011] Further, a protrusion serving as a slide rail is provided inside the cylinder housing.

[0012] The beneficial effects obtained by the present invention adopting the above structure are as follows:

[0013] (1) The diameter of the cylinder can be switched to adapt to different output intensities and reduce the number of stops;

[0014] (2) Pistons and cylinders with different diameters correspond to different working intensities. Multiple cylinders and pistons share the working pressure, increasing the running time without reducing the service life. Brief Description of the Drawings

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 is a schematic diagram of the internal structure of the present invention;

[0017] Figure 3 is a schematic diagram of the piston structure of the present invention;

[0018] Figure 4 is a schematic diagram of the structure of the first state of the cylinder of the present invention;

[0019] Figure 5 is a schematic diagram of the structure of the second state of the cylinder of the present invention.

[0020] Among them, 1, motor; 101, cooling fan; 2, housing; 201, motor housing; 202, cylinder housing; 203, chute; 204, positioning groove; 205, protrusion; 3, piston assembly; 301, piston rod; 302, piston; 303, leather cup; 4, cylinder group; 401, small-displacement cylinder; 402, large-displacement cylinder; 5, intermediate cylinder; 501, cylinder block; 502, large-mouth sealing plate; 503, small-mouth sealing plate; 504, sliding column; 505, positioning member; 6, valve plate; 7, bottom support plate; 8, intake cover.

[0021] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. Detailed Embodiments

[0022] The following will describe in detail the specific embodiments of the present invention with reference to the drawings.

[0023] In the following, various embodiments of the present application will be described more fully with reference to the drawings. The present application may have various embodiments and adjustments and changes may be made therein. Therefore, the present application will be described in more detail with reference to the specific embodiments shown in the drawings. However, it should be understood that there is no intention to limit the various embodiments of the present application to the specific embodiments described herein, but the present application should be understood to cover all adjustments, equivalents, and / or alternative solutions that fall within the spirit and scope of the various embodiments of the present application. In the description with reference to the drawings, the same reference numerals denote the same elements.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0025] This embodiment provides an oil-free air compressor. Referring to Figure 1 , Figure 2 .

[0026] Figure 1 is an overall view of the oil-free air compressor, including a motor 1, a housing 2, a piston assembly 3, a cylinder block 4, an intermediate cylinder 5, a valve plate 6, a bottom support plate 7, and an air inlet cover 8;

[0027] Figure 2 shows the internal structure of the oil-free air compressor. The motor 1, the piston assembly 3, the cylinder block 4, the intermediate cylinder 5, and the bottom support plate 7 are all arranged inside the housing 2, and the piston assembly 3 is rotatably placed on the rotor of the motor 1;

[0028] Cooling fans 101 are also provided at both ends of the motor 1. During the rotation of the rotor, the cooling fans 101 move synchronously with the rotor and the piston assembly 3 to discharge the heat generated by components such as the motor 1 and the cylinder block 4;

[0029] The housing 2 includes a motor housing 201 and a cylinder housing 202. The motor 1 is located inside the motor housing 201, and the cylinder block 4 and the intermediate cylinder 5 are located inside the cylinder housing 202;

[0030] As Figure 3 shown, the piston assembly 3 includes a piston rod 301, two pistons 302 with different diameters, and two leather cups 303 with different diameters;

[0031] As Figure 4 and Figure 5 shown, the cylinder block 4 includes two cylinders with different diameters, namely a small-displacement cylinder 401 and a large-displacement cylinder 402. The small-displacement cylinder 401 has the same diameter as the piston 302 and the leather cup 303 with a smaller diameter, while the large-displacement cylinder 402 has the same diameter as the piston 302 and the leather cup 303 with a larger diameter;

[0032] The stroke of the piston assembly 3 remains unchanged. Moving the cylinder block 4 can change the diameter of the working cylinder without changing the stroke of the piston;

[0033] The cylinder away from the valve plate 6 can work because an intermediate cylinder 5 is provided between the two cylinders.

[0034] The intermediate cylinder 5 includes a cylinder body 501, a large-mouth sealing plate 502, and a small-mouth sealing plate 503. AsFigure 4 , Figure 5 As shown, the diameter of the cylinder body 501 is larger than any cylinder in the cylinder group 4, and the cylinder body 501 is located between two cylinders in the cylinder group 4;

[0035] The lengths of the cylinder body 501 , the small displacement cylinder 401 and the large displacement cylinder 402 are the same, or the length of the cylinder body 501 is greater than the length of the cylinder. When one of the pistons overlaps with the cylinder, the other piston is located in the cylinder body 501 .

[0036] like Figure 1 and Figure 2 As shown, two sides of the cylinder body 501 are further provided with slide posts 504, and two sides of the cylinder shell 202 are also provided with slide grooves 203. The overlap relationship between the cylinder group 4 and the piston assembly 3 can be controlled by pressing down or lifting the slide posts 504 manually or using a tool;

[0037] A positioning piece 505 is also provided at the end of the sliding column 504, and positioning grooves 204 are also provided on both sides of the sliding groove 203 of the cylinder housing 202. The positioning piece 505 is rotatably connected to the sliding column 504. There are two positioning grooves 204, and the distance between the two positioning grooves 204 is the same as the distance between the two cylinders.

[0038] When adjusting the cylinder group 4, the positioning member 505 needs to be rotated to be coaxial with the sliding column 504. When fixing the cylinder group 4, the positioning member 505 needs to be rotated to be perpendicular to the sliding column 504 and ensure that it is located in the positioning groove 204.

[0039] like Figure 4 and Figure 5 As shown, the large-mouth sealing plate 502 is located between the large-displacement cylinder 402 and the cylinder body 501, and the small-mouth sealing plate 503 is located between the small-displacement cylinder 401 and the cylinder body 501. When the corresponding cylinders and pistons overlap, the space above the overlap of the cylinders and the pistons is sealed.

[0040] The small displacement cylinder 401 and the small diameter piston 302 are in a Figure 4 When the position shown in FIG. 1 is reached, the stroke remains unchanged, but the cylinder diameter becomes smaller, the volume of gas delivered is small, and the gas tank intake speed is slow. The large displacement cylinder 402 and the large diameter piston 302 are in the same position as shown in FIG. Figure 5 When it is in the position shown, the stroke remains unchanged, but the cylinder diameter becomes larger, the volume of gas transported is large, and the air intake speed of the gas tank is fast.

[0041] The valve plate 6 is located above the cylinder group 4 , and the valve plate 6 controls the inlet and outlet of gas. When the piston assembly 3 descends, external gas enters the cylinder group 4 through the valve plate 6 , and when the piston assembly 3 rises, compressed gas is discharged through the valve plate 6 .

[0042] The bottom support plate 7 is located below the cylinder block 4. The air intake cover 8, valve plate 6, cylinder block 4, intermediate cylinder 5, and bottom support plate 7 are fixedly bolted from top to bottom. Grooves are provided on the sides of the above-mentioned components, and a protrusion 205 is provided inside the cylinder housing 202. The above-mentioned components achieve vertical translation within the cylinder housing 202 through the cooperation of the grooves and the protrusion 205.

[0043] The air intake cover 8 sucks gas from the outside through the air intake port, inputs the gas into the gas tank through the connecting pipe, and dissipates heat through the heat dissipation plate with a protruding surface.

[0044] The above has shown and described the basic principles, main features, and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0045] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An oil-free air compressor, comprising a motor (1), a housing (2), a piston assembly (3), a cylinder group (4), an intermediate cylinder (5), a valve plate (6), and a bottom support plate (7), wherein the motor (1), the piston assembly (3), the cylinder group (4), the intermediate cylinder (5), and the bottom support plate (7) are all arranged inside the housing (2), the valve plate (6) is located above the cylinder group (4), and the bottom support plate (7) is located below the cylinder group (4), and is characterized in that: The cylinder group (4) includes a small-displacement cylinder (401) and a large-displacement cylinder (402); the piston assembly (3) includes a piston rod (301) and two pistons (302) of different diameters; the two pistons (302) of different diameters are connected via the piston rod (301); the intermediate cylinder (5) includes a cylinder body (501), a large-mouth sealing plate (502) and a small-mouth sealing plate (503); the large-mouth sealing plate (502) is located at the large-displacement cylinder (402). The small-mouth sealing plate (503) is located between the small-displacement cylinder (401) and the cylinder body (501), the intermediate cylinder (5) is located between the small-displacement cylinder (401) and the large-displacement cylinder (402), the valve plate (6), the large-displacement cylinder (402), the intermediate cylinder (5), the small-displacement cylinder (401) and the bottom support plate (7) are fixed from top to bottom by bolts, and the housing (2) includes a motor housing (201) and a cylinder housing (2 02, the motor (1) is located inside the motor housing (201), the cylinder group (4) and the intermediate cylinder (5) are located inside the cylinder housing (202), the diameter of the cylinder body (501) is larger than any cylinder in the cylinder group (4), the cylinder body (501), the small displacement cylinder (401) and the large displacement cylinder (402) are of the same length, and sliding columns (504) are further provided on two side surfaces of the cylinder body (501), and the ends of the sliding columns (504) are provided with positioning members (50 5), the cylinder housing (202) is also provided with slide grooves (203) on both sides, and positioning grooves (204) are provided on both sides of the slide groove (203). The distance between the two positioning grooves (204) is the same as the distance between the two cylinders. When adjusting the cylinder group (4), the positioning member (505) is rotated to be coaxial with the sliding column (504). When fixing the cylinder group (4), the positioning member (505) is rotated to be perpendicular to the sliding column (504) and fixed in the positioning groove (204).

2. The oil-free air compressor according to claim 1, characterized in that: A protrusion (205) serving as a slide rail is provided inside the cylinder shell (202), and grooves are provided on the sides of the valve plate (6), the cylinder group (4), the intermediate cylinder (5) and the bottom support plate (7), and the protrusion (205) cooperates with the groove to achieve the upward and downward translation of the cylinder group.

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