Double-cylinder air compressor

Abstract

The invention provides a double-cylinder air compressor, and belongs to the technical field of air compressors. The technical problem that an existing double-cylinder air compressor is large in noise is solved. The device comprises a crankcase, a driving motor is fixedly connected to the crankcase, the driving motor comprises a motor shaft, one end of the motor shaft extends into the crankcase, air cylinders are fixedly arranged on the two sides, perpendicular to the driving motor, of the crankcase respectively, and two connecting rods are fixedly connected to the motor shaft in a rotating mode. The ends, away from the motor shaft, of the two connecting rods are fixedly connected with pistons respectively, the two pistons are located in air cylinders respectively, the air cylinders are communicated with corresponding air outlet holes, the crankcase is communicated with an air inlet hole, and the air inlet hole can be communicated with the two air cylinders at the same time. The noise reduction device has a better noise reduction function.

Description

Technical Field

[0001] The invention belongs to the technical field of air compressors, in particular to a double-cylinder air compressor. Background Art

[0002] The working principle of a twin-cylinder air compressor is that when the air compressor starts to run, the piston moves downward in the cylinder, the suction valve opens, and the gas in the cylinder enters the cylinder. Then, when the piston moves upward, the suction valve closes, the gas in the cylinder is compressed, and the gas pressure in the cylinder increases. When the pressure is enough to push open the exhaust valve, the compressed air is discharged from the cylinder, and this cycle repeats to achieve continuous compression of the air. A twin-cylinder air compressor improves compression efficiency through the work of two cylinders, thereby generating high-pressure air.

[0003] For example, a twin-cylinder air compressor with publication number CN105089974B has crankcase 1 and crankcase 2 installed at both ends of the motor, and air compression components are installed in crankcase 1 and crankcase 2 respectively to work simultaneously to improve compression efficiency. The air compression components include connecting rods, pistons and cylinders. However, the airflow of the twin-cylinder air compressor enters and exits through two inlets and outlets, resulting in superimposed airflow noise, which affects the working efficiency of the air compressor. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a double-cylinder air compressor. The technical problem to be solved by the present invention is how to reduce noise while increasing exhaust volume.

[0005] The objective of the present invention can be achieved through the following technical solutions: a twin-cylinder air compressor, comprising a crankcase, a drive motor fixedly connected to the crankcase, the drive motor comprising a motor shaft, one end of the motor shaft extending into the crankcase, cylinders are fixedly arranged on both sides of the crankcase perpendicular to the drive motor, two connecting rods are rotatably fixedly connected to the motor shaft, pistons are fixedly connected to the ends of the two connecting rods away from the motor shaft, the two pistons are respectively located in the cylinders, the cylinders are connected with corresponding air outlets, the crankcase is connected with an air inlet, and the air inlet can be connected with two cylinders at the same time.

[0006] Furthermore, the crankcase has a accommodating cavity, the air intake hole is connected to the accommodating cavity, and the side wall of the crankcase is provided with a first intake air passage and a second intake air passage that are connected to the accommodating cavity and in opposite directions, and the first intake air passage and the second intake air passage are respectively connected to the corresponding cylinders.

[0007] Furthermore, one end of the cylinder away from the crankcase is fixedly connected to a valve seat, and a cylinder head is fixedly connected to the valve seat. An intake valve and an exhaust valve are provided on the valve seat, and the intake valve and the exhaust valve are arranged between the cylinder and the cylinder head. Aisle holes are provided on both valve seats, and the two aisle holes are respectively connected to the first intake flow channel and the second intake flow channel, and the aisle holes are located on the outside of the cylinder.

[0008] Furthermore, a heat insulating member is sealed and fixedly connected between the passage hole and the first intake air passage, and a heat insulating member is sealed and fixedly connected between the passage hole and the second intake air passage.

[0009] Furthermore, an air outlet portion is formed on one side of the valve seat, the air outlet hole is located in the air outlet portion, and the air outlet hole and the passage hole are located on two outer sides of the cylinder.

[0010] Furthermore, one end of the motor shaft fixedly connected to the two connecting rods is located in the accommodating cavity, and the two pistons move relative to or towards each other under the drive of the connecting rods.

[0011] Furthermore, the crankcase is formed with a cylinder body connection part, the cylinder is a straight cylindrical type, the cylinder seal is fixed between the cylinder body connection part and the valve seat, and the piston can move up and down in the cylinder driven by the connecting rod.

[0012] Furthermore, two eccentric wheels are fixedly connected to the motor shaft, bearings are fixedly sleeved outside the two eccentric wheels, and connecting rods are fixedly sleeved outside the two bearings.

[0013] Furthermore, the eccentric wheel includes a fixing part, a mounting part and an axial fixing hole passing through the fixing part and the mounting part. The axial fixing hole is fixedly connected to the motor shaft. The fixing part and the mounting part make eccentric motion around the axis of the axial fixing hole. The length of the mounting part is greater than the length of the bearing. The ends of the two mounting parts away from the fixing part abut against each other, one end of one fixing part abuts against the shoulder of the motor shaft, and one end of the other fixing part is fixedly connected to the fixing piece. The central axes of the two eccentric wheels are respectively located on both sides of the axis of the axial fixing hole.

[0014] Furthermore, the eccentric wheel is provided with at least one through hole on a side having a central axis, and the through hole passes through the fixing portion and the mounting portion.

[0015] Compared with the prior art, the technical effects of the present invention are as follows: 1. The air inlet is directly connected to the accommodating chamber. Since the volume of the accommodating chamber is large, the accommodating chamber can buffer the airflow coming in from the air inlet, reduce the impact force of the airflow, reduce pressure fluctuations, and make the whole machine better noise-reducing. 2. The first inlet flow channel and the second inlet flow channel can help guide the airflow, reduce the formation of vortices, and reduce the noise of the whole machine. 3. When the two pistons are at the highest part of the cylinder at the same time, the volume in the accommodating chamber is the largest. When the two pistons are at the bottom of the cylinder at the same time, the volume in the accommodating chamber is the smallest. The switching between the maximum volume and the minimum volume greatly increases the airflow in the accommodating chamber, increases the exhaust volume, accelerates heat dissipation, and improves efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the present invention.

[0017] Figure 2 It is a stepped cross-sectional view taken along the line AA of the present invention.

[0018] Figure 3 The crankcase three-dimensional Figure 1 .

[0019] Figure 4 The crankcase three-dimensional Figure 2 .

[0020] Figure 5 It is a three-dimensional diagram of the valve seat of the present invention.

[0021] Figure 6 It is a partial cross-sectional view of the present invention.

[0022] Figure 7 It is a stereoscopic view of the connecting rod motor shaft of the present invention.

[0023] Figure 8 It is an axial sectional view of the connecting rod motor of the present invention.

[0024] Figure number marking: 1. crankcase; 101. accommodating chamber; 102. first intake air channel; 103. second intake air channel; 104. cylinder body connecting part; 2. driving motor; 201. motor shaft; 3. cylinder; 4. connecting rod; 5. piston; 6. air outlet; 7. air inlet; 8. valve seat; 801. passage hole; 802. air outlet; 9. cylinder head; 901. air passage chamber; 10. air inlet valve; 11. air outlet valve; 12. heat insulation; 13. eccentric wheel; 1301. fixing part; 1302. mounting part; 1303. shaft fixing hole; 1304. through hole; 14. bearing; 15. fixing part; 16. muffler. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0026] It should be noted that the descriptions of the present invention regarding directions such as “up”, “down”, “left”, “right”, “top” and “bottom” are all defined based on the relationships between the orientations or positions shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0027] according to Figures 1 to 8As shown, a twin-cylinder air compressor comprises a crankcase 1, to which a driving motor 2 is fixedly connected, and the driving motor 2 comprises a motor shaft 201, one end of which extends into the crankcase 1, wherein the crankcase 1 is an integrally formed part, which is through-connected from top to bottom and from left to right, and two cylinder connecting parts 104 are formed on the upper and lower sides of the crankcase 1, the interior of the crankcase 1 is a accommodating chamber 101, the cylinder connecting part 104 is hollow and connected to the accommodating chamber 101, the crankcase 1 is also hollow in a vertical direction relative to the cylinder connecting part 104 and connected to the accommodating chamber 101, a case cover is fixedly connected to one side of the crankcase 1 in a vertical direction relative to the cylinder connecting part 104, an air inlet hole 7 is arranged in the middle of the case cover, the inner end of the air inlet hole 7 is connected to the accommodating chamber 101, and the outer end of the air inlet hole 7 is connected to a muffler 16, the other side of the crankcase 1 in a vertical direction relative to the cylinder connecting part 104 is fixedly connected to the driving motor 2, and one end of the motor shaft 201 is located in the accommodating chamber 101. Cylinders 3 are fixedly arranged on both sides of the crankcase 1 perpendicular to the driving motor 2. Two connecting rods 4 are rotatably fixedly connected to the motor shaft 201. The ends of the two connecting rods 4 away from the motor shaft 201 are fixedly connected to pistons 5. The two pistons 5 are respectively located in the cylinders 3. The end of the cylinder 3 away from the crankcase 1 is fixedly connected to a valve seat 8. The valve seat 8 is fixedly connected to a cylinder head 9. The valve seat 8 is provided with an intake valve 10 and an outlet valve 11. The intake valve 10 and the outlet valve 11 are arranged between the cylinder 3 and the cylinder head 9. The cylinder head 9 has an air passage cavity 901 with an opening toward the valve seat 8. The cylinder 3 is a straight cylindrical type. The cylinder 3 is sealed and fixed between the cylinder body connection part 104 and the valve seat 8. The piston 5 can move up and down in the cylinder 3 driven by the connecting rod 4. The cylinder 3 is connected to the corresponding outlet holes 6 through the outlet valves 11, and the intake hole 7 can be connected to the two cylinders 3 at the same time. After the airflow comes in from an air inlet 7, it passes through the accommodating chamber 101 and then is sucked into the cylinder 3 by the piston 5. The airflow in the cylinder 3 is output from the two air outlet holes 6 respectively. Since the noise of the air compressor is mainly the vortex and pressure fluctuation generated when the airflow passes through the air inlet hole 7 and the air outlet hole 6, now only one crankcase 1 is set to install the two cylinders 3. The crankcase 1 is connected to one air inlet hole 7, which can reduce the intake noise of the double-bar air compressor, and the air inlet hole 7 is directly connected to the accommodating chamber 101. Since the volume of the accommodating chamber 101 is large, the accommodating chamber 101 can buffer the airflow coming in from the air inlet hole 7, reduce the impact force of the airflow, reduce pressure fluctuations, and make the whole machine better noise-reducing.

[0028] The side wall of the crankcase 1 is provided with a first intake channel 102 and a second intake channel 103 which are connected to the accommodating chamber 101 and are in opposite directions. The first intake channel 102 and the second intake channel 103 are respectively connected to the corresponding cylinders 3 through the intake valve 10. The two valve seats 8 are provided with passage holes 801, which are respectively connected to the first intake channel 102 and the second intake channel 103, and the passage holes 801 are located outside the cylinder 3. An air outlet portion 802 is formed on one side of the valve seat 8, and the air outlet hole 6 is located in the air outlet portion 802. The air outlet hole 6 and the passage hole 801 are located on both sides of the cylinder 3. The airflow coming from the air inlet 7 is buffered in the accommodating chamber 101 and then absorbed by the piston 5. The airflow enters the two cylinders 3 respectively through the first intake air channel 102 and the second intake air channel 103. The airflow in the cylinder 3 is then transported to the air outlet 6 by the piston 5. The first intake air channel 102 and the second intake air channel 103 can help guide the airflow, reduce the formation of vortices, and reduce the noise of the whole machine.

[0029] A heat insulating member 12 is sealed and fixedly connected between the passage hole 801 and the first intake flow passage 102, and a heat insulating member 12 is sealed and fixedly connected between the passage hole 801 and the second intake flow passage 103. The heat insulating member 12 is a rubber member, and the heat insulating member 12 is directly connected to the valve seat 8 and the crankcase 1. The heat insulating member 12 can prevent the heat on the crankcase 1 from being transferred to the valve seat 8, and can also reduce the noise in this part.

[0030] The central axes of the two cylinders 3 are parallel, and the two cylinders 3 are arranged on the upper and lower sides of the crankcase 1. The two connecting rods 4 are located in the accommodating chamber 101 and fixed on the motor shaft 201. The two pistons 5 move relative to or towards each other under the drive of the connecting rods 4. The relative movement means that the two pistons 5 move toward the motor shaft 201, and the opposite movement means that the two pistons 5 move away from the motor shaft 201. Two eccentric wheels 13 are fixedly connected to the motor shaft 201, and the two eccentric wheels 13 are respectively fixedly sleeved with bearings 14 outside, and the two bearings 14 are respectively fixedly sleeved with connecting rods 4 outside. The eccentric wheel 13 includes a fixing portion 1301, a mounting portion 1302, and an axis fixing hole 1303 that passes through the fixing portion 1301 and the mounting portion 1302. The outer shape of the eccentric wheel 13 is a T-shaped cylindrical shape, wherein the diameter of the fixing portion 1301 is larger than the diameter of the mounting portion 1302, the shaft fixing hole 1303 is fixedly connected to the motor shaft 201, and the shaft fixing hole 1303 and the motor shaft 201 can be fixed in the circumferential direction by keyways and keys, or mutually matching fixing planes can be set in the motor shaft 201 and the shaft fixing hole 1303 to fix the eccentric wheel 13 and the motor shaft 201 in the circumferential direction without relative transfer. The fixing portion 1301 and the mounting portion 1302 make eccentric motion around the axis of the shaft fixing hole 1303, the length of the mounting portion 1302 is larger than the length of the bearing 14, the ends of the two mounting portions 1302 away from the fixing portion 1301 are against each other, one end of one fixing portion 1301 is against the shoulder of the motor shaft 201, and one end of the other fixing portion 1301 is fixedly connected to the fixing member 15, and the central axes of the two eccentric wheels 13 are respectively located on both sides of the axis of the shaft fixing hole 1303. The central axis of the eccentric wheel 13 is relative to the whole of the eccentric wheel 13. The eccentric wheel 13 is provided with at least one through hole 1304 on one side with the central axis, and the through hole 1304 passes through the fixing portion 1301 and the mounting portion 1302. When the motor shaft 201 rotates, the eccentric wheel 13 rotates accordingly, and the eccentric wheel 13 drives the connecting rod 4 to push the piston 5 upward or downward, so that the two pistons 5 are at the highest part of the cylinder 3 at the same time or at the bottom of the cylinder 3 at the same time. When the two pistons 5 are at the highest part of the stroke in the cylinder 3 at the same time, the volume in the accommodating chamber 101 is the largest, and when the two pistons 5 are at the bottom of the stroke in the cylinder 3 at the same time, the volume in the accommodating chamber 101 is the smallest. When the two pistons 5 move toward the accommodating chamber 101 at the same time until they are at the bottom of the stroke in the cylinder 3, an intake process is completed. When the two pistons 5 move away from the accommodating chamber 101 at the same time until they are at the highest part of the stroke in the cylinder 3, an exhaust process is completed. The intake and exhaust are cyclically completed under the rotation of the motor shaft 201. The cyclic switching between the maximum volume and the minimum volume greatly increases the airflow in the accommodating chamber 101. The rapid and large-scale flow of air increases the exhaust volume and accelerates heat dissipation, thereby improving efficiency.

[0031] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope defined by the claims of the present invention.

Claims

1. A twin-cylinder air compressor, comprising a crankcase (1), a drive motor (2) being fixedly connected to the crankcase (1), the drive motor (2) comprising a motor shaft (201), one end of the motor shaft (201) extending into the crankcase (1), characterized in that: Cylinders (3) are fixedly arranged on both sides of the crankcase (1) perpendicular to the drive motor (2), and two connecting rods (4) are rotatably fixedly connected to the motor shaft (201). The ends of the two connecting rods (4) away from the motor shaft (201) are fixedly connected to pistons (5), and the two pistons (5) are respectively located in the cylinders (3). The cylinders (3) are connected to corresponding air outlets (6). The crankcase (1) is connected to an air inlet (7), and the air inlet (7) can be connected to the two cylinders (3) at the same time.

2. A double-cylinder air compressor according to claim 1, characterized in that: The crankcase (1) has a housing chamber (101) therein, the air intake hole (7) is connected to the housing chamber (101), and a first air intake passage (102) and a second air intake passage (103) which are connected to the housing chamber (101) and are in opposite directions are arranged on the side wall of the crankcase (1), and the first air intake passage (102) and the second air intake passage (103) are respectively connected to the corresponding cylinders (3).

3. A double-cylinder air compressor according to claim 2, characterized in that: A valve seat (8) is fixedly connected to one end of the cylinder (3) away from the crankcase (1); a cylinder head (9) is fixedly connected to the valve seat (8); an intake valve (10) and an outlet valve (11) are arranged on the valve seat (8); the intake valve (10) and the outlet valve (11) are arranged between the cylinder (3) and the cylinder head (9); both valve seats (8) are provided with passage holes (801); the two passage holes (801) are connected to the first intake flow channel (102) and the second intake flow channel (103) respectively; and the passage holes (801) are located outside the cylinder (3).

4. A twin-cylinder air compressor according to claim 3, characterized in that: A heat insulating member (12) is sealed and fixedly connected between the passage hole (801) and the first intake air channel (102), and a heat insulating member (12) is sealed and fixedly connected between the passage hole (801) and the second intake air channel (103).

5. A twin-cylinder air compressor according to claim 3, characterized in that: An air outlet portion (802) is formed on one side of the valve seat (8), the air outlet hole (6) is located in the air outlet portion (802), and the air outlet hole (6) and the passage hole (801) are located on both outer sides of the cylinder (3).

6. A twin-cylinder air compressor according to claim 3, characterized in that: One end of the motor shaft (201) fixedly connected to the two connecting rods (4) is located in the accommodating chamber (101), and the two pistons (5) move relative to or towards each other under the drive of the connecting rods (4).

7. A twin-cylinder air compressor according to claim 6, characterized in that: The crankcase (1) is formed with a cylinder body connection portion (104); the cylinder (3) is a straight cylindrical shape; the cylinder (3) is sealed and fixed between the cylinder body connection portion (104) and the valve seat (8); and the piston (5) can move up and down in the cylinder (3) driven by the connecting rod (4).

8. A twin-cylinder air compressor according to claim 7, characterized in that: Two eccentric wheels (13) are fixedly connected to the motor shaft (201), bearings (14) are fixedly sleeved outside the two eccentric wheels (13), and connecting rods (4) are fixedly sleeved outside the two bearings (14).

9. A twin-cylinder air compressor according to claim 8, characterized in that: The eccentric wheel (13) comprises a fixing portion (1301), a mounting portion (1302), and a shaft fixing hole (1303) penetrating the fixing portion (1301) and the mounting portion (1302); the shaft fixing hole (1303) is fixedly connected to the motor shaft (201); the fixing portion (1301) and the mounting portion (1302) perform eccentric motion around the axis of the shaft fixing hole (1303); the length of the mounting portion (1302) is greater than the length of the bearing (14); the ends of the two mounting portions (1302) away from the fixing portion (1301) abut against each other; one end of one fixing portion (1301) abuts against the shaft shoulder of the motor shaft (201); one end of the other fixing portion (1301) is fixedly connected to the fixing piece (15); and the central axes of the two eccentric wheels (13) are respectively located on both sides of the axis of the shaft fixing hole (1303).

10. A twin-cylinder air compressor according to claim 9, characterized in that: The eccentric wheel (13) is provided with at least one through hole (1304) on a side having a central axis, and the through hole (1304) passes through the fixing portion (1301) and the mounting portion (1302).

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