Four-cylinder air compressor

Abstract

The utility model provides a four -cylinder air compressor belongs to air compressor technical field. It solved the problem of the compression efficiency of existing double -cylinder air compressor to air. The four -cylinder air compressor, including the casing, motor, two eccentric wheels, cylinder cover, valve plate and piston, the number of cylinder cover, valve plate and piston is four and sets up one -to -one correspondence, two two are a group in four pistons, and one end of two group pistons corresponds to the outside of two eccentric wheels respectively, and the other end of four pistons respectively extends into the corresponding cylinder cover, and two pistons in each group of pistons are sequentially sleeved outside the eccentric wheel along the axial direction of eccentric wheel, and the outside of eccentric wheel is located between two pistons and is further fixed with the circular ring shaped spacer, and the sidewall of casing is provided with the air inlet, and the side of four cylinder covers is all provided with the gas outlet. The four -cylinder air compressor has the advantages of high compression efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of air compressor technology and relates to a four-cylinder air compressor. Background Technology

[0002] An air compressor is a device that compresses air. It mainly includes components such as a housing, motor, cylinder liner, piston, valve plate, and cylinder head. Its main working principle is that the up and down movement of the piston compresses the space between the piston and the valve plate. When the piston moves upward, it compresses the air between the piston and the valve plate and discharges it into the exhaust chamber formed between the valve plate and the cylinder head through the exhaust port on the valve plate. When the piston moves downward, air is introduced through the air intake port on the valve plate to make up for the discharged air. The air intake port corresponds to an independent air intake chamber between the valve plate and the cylinder head.

[0003] For example, the applicant designed an internal air intake air compressor and applied for a Chinese patent with application number 202220926778.5 and publication number CN217152205U. The internal air intake air compressor includes a housing, with compression cylinders at both ends of the housing. A valve plate is provided on the top of each compression cylinder, and a cylinder head is pressed onto the valve plate. A piston assembly is slidably provided inside each compression cylinder, dividing the inner cavity of the compression cylinder into an upper chamber and a lower chamber. An air intake hole communicating with the outside is provided on the cylinder wall of the lower chamber. An air hole I communicating with the upper chamber and the lower chamber is provided on each piston assembly, and a one-way valve plate I covering the upper opening of the air hole I is provided on each piston assembly. An exhaust hole is provided on each valve plate, and a one-way valve plate II covering the upper opening of the exhaust hole is provided on each valve plate. A hollow tube communicating with the inner cavities of the two cylinder heads is provided between the two cylinder heads, and at least one cylinder head has an air hole II communicating with the outside.

[0004] However, this type of air compressor still has insufficient air compression efficiency in actual use, making it difficult to meet the needs of some users. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a four-cylinder air compressor, which solves the problem of insufficient air compression efficiency in existing two-cylinder air compressors.

[0006] The objective of this utility model can be achieved through the following technical solutions: A four-cylinder air compressor includes a housing, a motor fixed in the middle of the housing, two eccentric wheels, a cylinder head, a valve plate fixed inside the cylinder head, and a long, strip-shaped piston disposed inside the housing. The motor has output shafts extending into the housing on its left and right sides. The two eccentric wheels are respectively fitted and fixed to the outside of the two output shafts of the motor. The compressor is characterized in that there are four cylinder heads, four valve plates, and four pistons, arranged in a one-to-one correspondence. Two cylinder heads are arranged in pairs, and the two pairs of cylinder heads are respectively fixed to the top of the left and right sides of the housing. Each set of cylinder heads is distributed at intervals on the top of the engine housing along the front-to-back direction. The four pistons are arranged in pairs, with one end of each pair of pistons being fitted onto the outside of the two eccentric wheels. The other ends of the four pistons extend into the corresponding cylinder heads. Two pistons in each set are sequentially fitted onto the outside of the eccentric wheel along its axial direction. A circular spacer is fixed between the two pistons on the outside of the eccentric wheel. An air inlet is provided on the side wall of the engine housing, and an air outlet is provided through the side of each of the four cylinder heads.

[0007] In this four-cylinder air compressor, the specific structure of the cylinder head and valve plate is the same as in existing technology. This four-cylinder air compressor has four pistons mounted on two eccentric wheels on either side of a motor. With the four cylinder heads and valve plates, the motor can simultaneously drive all four pistons to extend and retract during operation. Compared to existing technologies where only two pistons can be driven by a single motor for air compression, this significantly improves air compression efficiency and meets the needs of more users. Furthermore, because two pistons in each group are mounted on the outside of an eccentric wheel, a spacer is placed between them to prevent interference during operation, ensuring efficient air compression.

[0008] In the aforementioned four-cylinder air compressor, bearings are provided between the piston and the eccentric wheel. Each bearing includes an inner ring fixed to the eccentric wheel and an outer ring fixed to the piston. The outer ring is fitted around the outside of the inner ring, and a spacer is positioned between the two inner rings, with the outer diameter of the spacer being smaller than the inner diameter of the outer ring. The smaller outer diameter of the spacer prevents relative friction between the outer ring and the spacer during rotation relative to the eccentric wheel, avoiding interference and ensuring smooth piston movement and efficient air compression.

[0009] In the aforementioned four-cylinder air compressor, the included angle between the axes of the two cylinder heads in each set of cylinder heads is 90 degrees. The 90-degree angle between the two cylinder heads spaced apart not only facilitates production and installation but also makes the entire casing more stable during piston operation.

[0010] In the aforementioned four-cylinder air compressor, one end of the piston is annular, and the other end is disc-shaped, with a through hole extending from the center of the other end of the piston. This through hole connects the two sides of the other end of the piston, allowing gas entering the housing through the intake port to be delivered between the other end of the piston and the cylinder head.

[0011] In the aforementioned four-cylinder air compressor, a seal is formed between the outer side of the other end of the piston and the inner wall of the cylinder head.

[0012] In the aforementioned four-cylinder air compressor, the bottom of the housing has a plate-shaped, horizontally arranged mounting base, and the mounting base has a vertically penetrating mounting hole. The housing can be fixed to the mounting base by fasteners passing through the mounting hole, ensuring the stability of the housing during operation and thus ensuring the efficiency of air compression.

[0013] Compared with existing technologies, this four-cylinder air compressor has four pistons mounted on two eccentric wheels on both sides of a motor. With the addition of four cylinder heads and valve plates, the motor can simultaneously drive all four pistons to extend and retract when it is working, which improves the efficiency of compressed air and can meet the needs of more users. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of a four-cylinder air compressor.

[0015] Figure 2 This is a cross-sectional structural diagram of a four-cylinder air compressor.

[0016] Figure 3 This is a cross-sectional structural diagram of the four-cylinder air compressor from another perspective.

[0017] In the diagram, 1 is the housing; 1a is the air inlet; 1b is the mounting base; 2 is the motor; 2a is the output shaft; 3 is the eccentric wheel; 4 is the cylinder head; 4a is the air outlet; 5 is the valve plate; 6 is the piston; 6a is the through hole; 7 is the spacer; 8 is the bearing; 8a is the inner ring; and 8b is the outer ring. Detailed Implementation

[0018] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0019] like Figures 1-3As shown, this four-cylinder air compressor includes a housing 1, a motor 2 fixed in the middle of the housing 1 with two output shafts 2a extending from the left and right, two eccentric wheels 3 sleeved and fixed outside the two output shafts 2a of the motor 2, four cylinder heads 4, four valve plates 5 respectively fixed inside the cylinder heads 4, and four elongated pistons 6 corresponding to the cylinder heads 4. The bottom of the housing 1 has a plate-shaped, horizontally arranged mounting base 1b with vertically penetrating mounting holes. The structures of the cylinder heads 4, valve plates 5, and one-way valve plates on the valve plates 5 are the same as in the prior art.

[0020] The four cylinder heads 4 are divided into two groups and fixed to the top of the left and right sides of the housing 1, with two cylinder heads 4 in each group spaced apart along the front-rear direction. Here, to facilitate the production and installation of the piston 6, the two cylinder heads 4 in each group are staggered along the left-right direction. In this embodiment, the included angle between the axes of the two cylinder heads 4 distributed along the front-rear direction in each group is 90 degrees; each of the left and right sides of the housing 1 has an air inlet 1a, and the two air inlets 1a are connected by a horizontally arranged air inlet pipe, with an air inlet hole through the side of the air inlet pipe; each of the four cylinder heads 4 has an air outlet 4a through the side, and the air outlets 4a between the left and right opposite cylinder heads 4 are connected by an air outlet pipe, with an air outlet hole through the side of the air outlet pipe.

[0021] The four pistons 6 are arranged in pairs, with one end of each pair of pistons 6 fitted onto the outer side of the two eccentric wheels 3. The other ends of the four pistons 6 extend into the corresponding cylinder head 4. Two pistons 6 in each pair are sequentially fitted onto the outer side of the eccentric wheel 3 along its axial direction. A circular spacer 7 is fixed between the two pistons 6 on the outer side of the eccentric wheel 3. In this embodiment, one end of the piston 6 is circular and has a notch. A bolt and nut are installed at the notch of the piston 6. After this end is fitted onto the eccentric wheel 3, the bolt head and nut are brought closer together by tightening the bolt, pressing the parts on both sides of the notch to achieve radial limiting between the eccentric wheel 3 and the piston 6. The other end of the piston 6 is disc-shaped, and a seal is formed between the outer side of the other end of the piston 6 and the inner wall of the cylinder head 4. A through hole 6a is provided at the off-center part of the other end of the piston 6.

[0022] Specifically, a bearing 8 is provided between each piston 6 and the eccentric wheel 3. The bearing 8 includes an inner ring 8a fixed to the eccentric wheel 3 and an outer ring 8b fixed to the piston 6. The outer ring 8b is sleeved on the outside of the inner ring 8a and several balls are provided between them. A spacer 7 is provided between the two inner rings 8a and the outer diameter of the spacer 7 is smaller than the inner diameter of the outer ring 8b.

[0023] When this four-cylinder air compressor is working, the motor 2 drives the two output shafts 2a to rotate circumferentially. This, in turn, drives two sets of pistons 6 at the cylinder head 4 via eccentric wheels 3 to compress air. The operation and principle of air compression are the same as in existing technologies. The difference is that the two pistons 6 in each set are staggered. Therefore, during each rotation of the eccentric wheel 3, the two pistons 6 alternately compress air. This means that all four pistons 6 in this four-cylinder air compressor can compress air under the drive of the two eccentric wheels 3. Compared to existing technologies where one motor 2 can only drive two pistons 6 for air compression, this significantly improves the efficiency of air compression and can meet the needs of more users.

[0024] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A four-cylinder air compressor, comprising a housing (1), a motor (2) fixed in the middle of the housing (1), two eccentric wheels (3), a cylinder head (4), a valve plate (5) fixed inside the cylinder head (4), and a long piston (6) disposed inside the housing (1), wherein the motor (2) has output shafts (2a) extending into the housing (1) on its left and right sides respectively, and the two eccentric wheels (3) are respectively sleeved and fixed on the outside of the two output shafts (2a) of the motor (2), characterized in that, The number of cylinder heads (4), valve plates (5) and pistons (6) are four and they are arranged in a one-to-one correspondence. The four cylinder heads (4) are arranged in pairs and the two sets of cylinder heads (4) are fixed on the top of the left and right sides of the housing (1). Each set of cylinder heads (4) is distributed at intervals on the top of the housing (1) along the front-back direction. The four pistons (6) are arranged in pairs. One end of each set of pistons (6) is respectively fitted on the outside of the two eccentric wheels (3). The other end of each set of pistons (6) extends into the corresponding cylinder head (4). Two pistons (6) in each set of pistons (6) are sequentially fitted on the outside of the eccentric wheel (3) along the axial direction of the eccentric wheel (3). A circular spacer (7) is fixed between the two pistons (6) on the outside of the eccentric wheel (3). An air inlet (1a) is opened on the side wall of the housing (1). An air outlet (4a) is opened through the side of each of the four cylinder heads (4).

2. A four-cylinder air compressor according to claim 1, characterized in that, A bearing (8) is provided between the piston (6) and the eccentric wheel (3). The bearing (8) includes an inner ring (8a) fixed to the eccentric wheel (3) and an outer ring (8b) fixed to the piston (6). The outer ring (8b) is sleeved on the outside of the inner ring (8a). The spacer (7) is provided between the two inner rings (8a) and the outer diameter of the spacer (7) is smaller than the inner diameter of the outer ring (8b).

3. A four-cylinder air compressor according to claim 1 or 2, characterized in that, The included angle between the axes of the two cylinder heads (4) in each group is 90 degrees.

4. A four-cylinder air compressor according to claim 1 or 2, characterized in that, The piston (6) has a ring shape at one end and a disk shape at the other end, and a through hole (6a) is provided at the other end of the piston (6) off-center.

5. A four-cylinder air compressor according to claim 4, characterized in that, A seal is formed between the outer side of the other end of the piston (6) and the inner wall of the cylinder head (4).

6. A four-cylinder air compressor according to claim 1 or 2, characterized in that, The bottom of the housing (1) has a plate-shaped and horizontally arranged fixing seat (1b), and the fixing seat (1b) has a mounting hole through it in the vertical direction.

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