Double-cylinder air compressor

Abstract

The utility model relates to the technical field of air compression devices, in particular to a double-cylinder air compressor which comprises a prime mover, an air compressor, an air compressor and a control device. The compression assembly comprises an air cylinder, a connecting rod and a piston, the first end of the connecting rod is rotatably connected with the eccentric shaft sleeve, and the second end of the connecting rod is fixedly connected with the piston; at least one connecting rod is arranged in an offset mode relative to the axes of the pistons, and the offset direction is the direction in which the two pistons are away from each other. Compared with the prior art, according to the double-cylinder air compressor, the compression assemblies are arranged on the two sides of the prime motor, and the two air cylinders are arranged in parallel, so that the structure of the double-cylinder air compressor is as compact as possible, and the size of the double-cylinder air compressor is reduced; the offset arrangement of the connecting rod is beneficial to reducing the distance between the axes of the two air cylinders, so that the size of the double-cylinder air compressor is further reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air compression devices, and particularly relates to a double-cylinder air compressor. BACKGROUND

[0002] The double-cylinder air compressor is a mechanical device for realizing efficient gas compression through alternating operation of double cylinders. The core structure of the double-cylinder air compressor is composed of two independent cylinders, a piston, a crankshaft and a cooling system. The double-cylinder air compressor is arranged in a vertical or horizontal manner and driven by a crankshaft connecting rod mechanism to complete the suction, compression and exhaust cycles through the reciprocating motion of the piston. The double-cylinder design enables the two cylinders to operate with a phase difference, and the driving shaft can complete two compressions per revolution, which increases the efficiency by about 40% compared with a single-cylinder model. At the same time, the alternating operation balances the vibration and reduces the operating noise by 15-20 decibels. Some models are equipped with an intelligent drainage system to realize non-stop drainage through an independent control module, thereby avoiding the loss of compressed air. The double-cylinder air compressor is mainly applied to the fields of automobile air conditioning refrigeration, industrial pneumatic tools, food packaging and medical equipment.

[0003] CN118128723A discloses a double-cylinder air compressor, which comprises a prime mover, a compression assembly, a driving shaft and an eccentric shaft sleeve mounted on the driving shaft. The compression assembly comprises a cylinder, a connecting rod and a piston. The first end of the connecting rod is rotatably connected with the eccentric shaft sleeve, and the second end of the connecting rod is fixedly connected with the piston. The compression assembly comprises two, and the two compression assemblies are arranged on one side of the driving shaft. The driving shaft drives the piston to reciprocate in the axial direction of the cylinder. When the piston reciprocates, there are two processes in which the two pistons simultaneously approach or move away from the axis of the driving shaft. By limiting the processes in which the two pistons simultaneously approach or move away from the axis of the driving shaft, the vibration generated by the two compression assemblies during operation can be reduced, thereby solving the vibration problem from the source.

[0004] CN206770150U discloses a double-cylinder water-cooled air compressor for the textile industry. The structure comprises universal casters, a chassis, a motor, a gas discharge interface, a push handle, a cooling water pump, a double-capacitor starting box, a primary compression cylinder and a secondary compression cylinder. The chassis is provided with universal casters, and the chassis and the universal casters are gap-fitted. The chassis is provided with a motor at the top, and the chassis and the motor are threadedly connected. The motor is provided with a push handle, and the motor and the push handle are welded. The motor is provided with a double-capacitor starting box, and the motor and the double-capacitor starting box are interference-fitted. The double-capacitor starting box is provided with a gas discharge interface, and the double-capacitor starting box and the gas discharge interface are integrated. The cooling water pump is arranged on the left side of the capacitor starting box. The double-cylinder water-cooled air compressor can be quickly cooled by the cooling water pump, thereby increasing the service life of the double-cylinder water-cooled air compressor. The universal casters enable the double-cylinder water-cooled air compressor to move quickly.

[0005] In the prior art, the double-cylinder air compressor has a large volume and cannot meet the requirements of installation and use in small devices. SUMMARY

[0006] For the double-cylinder air compressor, the arrangement of the two cylinders generally includes the following three types: first, the two cylinders are located on the same side of the motor, and the axes of the two cylinders coincide; second, the two cylinders are located on the two sides of the motor respectively, and the axes of the two cylinders are arranged in parallel; third, the two cylinders are located on the same side of the motor, and the axes of the two cylinders are arranged in cross. However, no matter which arrangement of the cylinders, the overall volume of the double-cylinder air compressor is large, which cannot be applied to small-sized use scenarios.

[0007] Therefore, the present application provides a double-cylinder air compressor, comprising:

[0008] A prime mover comprising a driving shaft and an eccentric shaft sleeve mounted on the driving shaft;

[0009] A compression assembly comprising a cylinder, a connecting rod and a piston, the first end of the connecting rod being rotatably connected with the eccentric shaft sleeve, and the second end of the connecting rod being fixedly connected with the piston; the compression assembly comprises two, and the two compression assemblies are arranged on one side of the driving shaft respectively, and the two cylinders are arranged in parallel; at least one connecting rod is arranged offset relative to the axis of the piston, and the offset direction is the direction in which the two pistons are away from each other.

[0010] In an embodiment, the connecting rod is fixedly connected with a first region of the piston, and the first region is located on the side of the piston away from the other piston.

[0011] In an embodiment, the distance between the center faces of the two connecting rods is greater than the distance between the axes of the two cylinders.

[0012] In an embodiment, the outer diameter D of the piston is 5 to 20 times the distance d between the center face of the connecting rod and the axis of the corresponding piston.

[0013] In an embodiment, the two cylinders are located on the same side of the axis of the driving shaft.

[0014] In an embodiment, the ratio of the outer diameter of the piston to the stroke of the piston ranges from 4 to 10.

[0015] In an embodiment, the compression assembly further comprises a balance block, and the balance block is arranged on the eccentric shaft sleeve and located between the connecting rod and the prime mover.

[0016] In an embodiment, the double-cylinder air compressor further comprises an air inlet, which is communicated with the cylinders through a pipeline, and the air inlet is arranged between the two compression assemblies.

[0017] The double-cylinder air compressor further comprises an air outlet and a safety valve, the air outlet is communicated with the cylinders through a pipeline, and the air outlet is arranged between the two compression assemblies; the safety valve is communicated with the air outlet through a pipeline, and the safety valve is arranged between the two compression assemblies.

[0018] In an embodiment, the compression assembly further comprises a cylinder cover and a valve plate, the cylinder cover is fixedly connected with the cylinder, and the valve plate is arranged between the cylinder cover and the cylinder, an air passage is formed in the valve plate, and a one-way valve flap is arranged on an end face of an end of the air passage away from the cylinder, and a groove is arranged on a circumferential side of the one-way valve flap.

[0019] In an embodiment, the area of the groove accounts for more than one third of the area of the valve plate.

[0020] Compared with the prior art, the double-cylinder air compressor provided by the application has the advantages that the compression assemblies are arranged on both sides of the prime mover, and the two cylinders are arranged side by side, which is beneficial to making the structure of the double-cylinder air compressor as compact as possible, so as to reduce the volume of the double-cylinder air compressor; meanwhile, at least one of the connecting rods is arranged in a direction offset relative to the axis of the piston, and the offset direction is a direction in which the two pistons are away from each other, and the offset arrangement of the connecting rod is beneficial to reducing the distance between the axes of the two cylinders, so as to further reduce the volume of the double-cylinder air compressor.

[0021] Other features and advantages of the application will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments thereof and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application.

[0023] In the drawings:

[0024] Figure 1 It is a perspective view of the double-cylinder air compressor according to an embodiment of the present application;

[0025] Figure 2 It is a front view of the double-cylinder air compressor according to an embodiment of the present application;

[0026] Figure 3 It is a sectional view of the double-cylinder air compressor according to an embodiment of the present application;

[0027] Figure 4 It is a sectional view of the double-cylinder air compressor alongFigure 2 Cross-sectional view along the plane A-A;

[0028] Figure 5 Cross-sectional view of the compression assembly according to an embodiment of the application;

[0029] Figure 6 Schematic view of the structure of the connecting rod according to an embodiment of the application;

[0030] Figure 7 Schematic view of the structure of the valve plate according to an embodiment of the application.

[0031] Explanation of reference signs:

[0032] 1 prime mover 2 compression assembly

[0033] 3 air inlet 4 air outlet

[0034] 5 safety valve 11 drive shaft

[0035] 12 eccentric shaft sleeve 21 cylinder

[0036] 22 connecting rod 23 piston

[0037] 24 balance weight 25 cylinder head

[0038] 26 valve plate 27 check valve flap

[0039] 261 vent hole 262 groove DETAILED DESCRIPTION

[0040] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0041] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0042] It should be noted that the terms "first," "second," "third," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0043] To address the limitation of miniaturizing existing twin-cylinder air compressors, this invention provides a twin-cylinder air compressor, such as... Figures 1 to 7 As shown, it includes:

[0044] The prime mover 1 includes a drive shaft 11 and an eccentric bushing 12 mounted on the drive shaft 11. The prime mover 1 includes an internal combustion engine or an electric motor. The drive shaft 11 passes through both ends of the prime mover 1, forming two drive ends. The eccentric bushing 12 is circular and has a mounting hole. The axis of the mounting hole is parallel to the axis of the eccentric bushing 12. The eccentric bushing 12 is mounted on the drive end through the mounting hole, and when the drive shaft 11 rotates, it drives the eccentric bushing 12 to rotate.

[0045] Compression component 2, such as Figure 5 As shown, the assembly includes a cylinder 21, a connecting rod 22, and a piston 23. The first end of the connecting rod 22 is rotatably connected to the eccentric bushing 12. Specifically, the first end of the connecting rod 22 is connected to the eccentric bushing 12 via a bearing. When the eccentric bushing 12 rotates, it causes the first end of the connecting rod 22 to swing. The second end of the connecting rod 22 is fixedly connected to the piston 23. Specifically, the second end of the connecting rod 22 and the piston 23 are integrally formed. Preferably, a reinforcing rib is provided at the connection between the second end of the connecting rod 22 and the piston 23. This reinforcing rib increases the connection strength between the connecting rod 22 and the piston 23 and also adjusts the center of gravity of the piston 23. The compression assembly 2 includes two components, each disposed on one side of the drive shaft 11. The two cylinders 21 are arranged side-by-side. Preferably, the axes of the two cylinders 21 are parallel to each other. Figure 3 and Figure 6As shown, at least one of the connecting rods 22 is arranged offset relative to the axis of the piston 23, that is, the center plane of the connecting rod 22 is not located on the axis of the piston 23. In the prior art, the connecting rod 22 is usually fixedly connected or rotatably connected with the center position of the piston 23. Unlike the prior art, in the present application, the connecting rod 22 is not fixedly connected with the center position of the piston 23, and the connecting region of the connecting rod 22 is located on one side of the center position of the piston 23. Specifically, the offset direction is the direction in which the two pistons 23 are away from each other, that is, the connecting region is located on the side of the piston 23 away from the other piston 23.

[0046] Compared with the prior art, the double-cylinder air compressor provided by the present application has the following advantages. The compression assembly 2 is arranged on both sides of the prime mover 1, and the two cylinders 21 are arranged side by side. Compared with the prior art in which the two cylinders 21 are arranged on the same side of the prime mover 1 and opposite to each other, the arrangement of the present application is beneficial to making the structure of the double-cylinder air compressor as compact as possible, so as to reduce the volume of the double-cylinder air compressor. In the above arrangement, the two cylinders 21 constitute the two ends of the double-cylinder air compressor in the axial direction of the driving shaft 11. In order to further reduce the length of the double-cylinder air compressor in the axial direction of the driving shaft 11, at least one of the connecting rods 22 is arranged offset relative to the axis of the piston 23, and the offset direction is the direction in which the two pistons 23 are away from each other. The offset arrangement of the connecting rod 22 is beneficial to reducing the distance between the axes of the two cylinders 21, thereby reducing the length of the double-cylinder air compressor in the axial direction of the driving shaft 11, and further reducing the volume of the double-cylinder air compressor.

[0047] As described above, the first region of the connecting rod 22 is fixedly connected with the piston 23, and the first region is located on the side of the piston 23 away from the other piston 23.

[0048] In one embodiment, as shown in the accompanying drawings, Figure 4 Figure 4 The dotted line in the above figure indicates the plane in which the axis of the cylinder 21 is located, Figure 4 The straight line adjacent to the dotted line in the above figure indicates the center plane of the connecting rod 22. The distance between the center planes of the two connecting rods 22 is greater than the distance between the axes of the two cylinders 21. In the above arrangement, the center plane of the connecting rod 22 refers to the center plane of the connecting rod 22 in the thickness direction. The above arrangement can reduce the distance between the two pistons 23, thereby reducing the length of the double-cylinder air compressor in the axial direction of the driving shaft 11.

[0049] ​In order to reduce the height of the double-cylinder air compressor, the outer diameter D of the piston 23 is 5 to 20 times the distance d between the center plane of the connecting rod 22 and the axis of the corresponding piston 23. In the above, the outer diameter of the piston 23 does not include the thickness of the sealing ring. Such a setting limits the degree of bias between the connecting rod 22 and the piston 23, and within this range, the reduction in volume and the improvement in the service life of the compression assembly 2 are balanced; if the value of D / d is too large, the effect on the length of the double-cylinder air compressor is limited; if the value of D / d is too small, the stress at the connection between the connecting rod 22 and the piston 23 will be large, reducing the service life of the compression assembly 2.

[0050] In an embodiment, the two cylinders 21 are located on the same side of the axis of the drive shaft 11. Such a setting reduces the height of the double-cylinder air compressor.

[0051] In an embodiment, the ratio of the outer diameter of the piston 23 to the stroke of the piston 23 is in the range of 4 to 10. Such a setting allows the connecting rod 22 to complete the compression of a certain amount of gas with a smaller stroke; under this condition, the outer diameter of the piston 23 is smaller than the outer diameter of the prime mover 1, so the increase in the outer diameter of the piston 23 does not affect the width of the double-cylinder air compressor. If the ratio of the outer diameter of the piston 23 to the stroke of the piston 23 is too large, it will affect the width of the double-cylinder air compressor; if the ratio of the outer diameter of the piston 23 to the stroke of the piston 23 is too small, it will not reduce the height of the double-cylinder air compressor.

[0052] In order to reduce the noise of the double-cylinder air compressor, the compression assembly 2 further comprises a balance block 24, which is arranged on the eccentric shaft sleeve 12 and between the connecting rod 22 and the prime mover 1. Since the connecting rod 22 is arranged offset relative to the axis of the piston 23, the center of gravity of the piston 23 is located on one side of the connecting rod 22, which setting will cause additional vibration during the reciprocation of the piston 23. By arranging the balance block 24 between the connecting rod 22 and the prime mover 1, this vibration can be effectively suppressed, thereby reducing the noise of the double-cylinder air compressor.

[0053] In order to reduce the width and the length in the axial direction of the drive shaft 11 of the double-cylinder air compressor, the double-cylinder air compressor further comprises an air inlet 3, which is in communication with the cylinder 21 through a pipeline, and the air inlet 3 is arranged between the two compression assemblies 2; or

[0054] The double-cylinder air compressor further comprises an air outlet 4 and a safety valve 5, the air outlet 4 is in communication with the cylinder 21 through a pipeline, and the air outlet 4 is arranged between the two compression assemblies 2; the safety valve 5 is in communication with the air outlet 4 through a pipeline, and the safety valve 5 is arranged between the two compression assemblies 2.

[0055] To reduce the noise of the twin-cylinder air compressor, such as Figure 5 As shown, the compression assembly 2 also includes a cylinder head 25 and a valve plate 26, the cylinder head 25 being fixedly connected to the cylinder 21, as shown. Figure 7 As shown, the valve plate 26 is disposed between the cylinder head 25 and the cylinder 21. A vent hole 261 is provided on the valve plate 26. A one-way valve plate 27 is installed on the end face of the valve plate 26 away from the cylinder 21, and the one-way valve plate 27 presses against the vent hole 261. When the piston 23 draws in air, the gas enters the cylinder 21 through the vent hole 261. Because the one-way valve plate 27 is elastic, the gas needs to overcome the pressure of the one-way valve plate 27 to enter the cylinder 21. When the gas with a certain pressure enters the cylinder 21, it moves along the end face of the valve plate 26 under the obstruction of the one-way valve plate 27. Due to the sudden drop in pressure, a whistling sound is generated. A groove 262 is provided around the one-way valve plate 27, so that the gas entering the cylinder 21 is disturbed by the groove 262 as it moves along the end face of the valve plate 26, forming a counter-current of airflow, thereby reducing the noise generated by the gas.

[0056] Preferably, the area of ​​the groove 262 occupies more than one-third of the area of ​​the valve plate 26. This arrangement is beneficial for maximizing noise reduction. More preferably, the groove 262 is C-shaped and arranged on the periphery of the one-way valve plate 27.

[0057] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0058] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0059] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical or other forms.

[0060] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A two-cylinder air compressor, characterized by The utility model relates to a double-cylinder air compressor, comprising: a prime mover (1) comprising a driving shaft (11) and an eccentric sleeve (12) mounted on the driving shaft (11); a compression assembly (2) comprising a cylinder (21), a connecting rod (22) and a piston (23), the first end of the connecting rod (22) being rotatably connected to the eccentric sleeve (12), the second end of the connecting rod (22) being fixedly connected to the piston (23); the compression assembly (2) comprises two, and the two compression assemblies (2) are arranged on one side of the driving shaft (11), and the two cylinders (21) are arranged side by side; at least one connecting rod (22) is arranged offset relative to the axis of the piston (23), and the offset direction is the direction in which the two pistons (23) are away from each other.

2. The two-cylinder air compressor of claim 1, wherein, The first region of the connecting rod (22) and the piston (23) is fixedly connected, and the first region is located on the side of the piston (23) away from the other piston (23).

3. The two-cylinder air compressor of claim 1, wherein, The distance between the center planes of the two connecting rods (22) is greater than the distance between the axes of the two cylinders (21).

4. The two-cylinder air compressor of claim 1, wherein, The outer diameter D of the piston (23) is 5 to 20 times the distance d between the center plane of the connecting rod (22) and the axis of the corresponding piston (23).

5. The two-cylinder air compressor of claim 1, wherein, The two cylinders (21) are located on the same side of the axis of the driving shaft (11).

6. The two-cylinder air compressor of claim 1, wherein, The ratio of the outer diameter of the piston (23) to the stroke of the piston (23) ranges from 4 to 10.

7. The two-cylinder air compressor of claim 1, wherein, The compression assembly (2) further comprises a balance block (24) arranged on the eccentric sleeve (12) and located between the connecting rod (22) and the prime mover (1).

8. The two-cylinder air compressor of claim 1, wherein, The double-cylinder air compressor further comprises an air inlet (3) in communication with the cylinder (21) through a pipeline, and the air inlet (3) is arranged between the two compression assemblies (2); or The double-cylinder air compressor further comprises an air outlet (4) and a safety valve (5), the air outlet (4) is in communication with the cylinder (21) through a pipeline, and the air outlet (4) is arranged between the two compression assemblies (2); the safety valve (5) is in communication with the air outlet (4) through a pipeline, and the safety valve (5) is arranged between the two compression assemblies (2).

9. The two-cylinder air compressor of claim 1, wherein, The compression assembly (2) further comprises a cylinder cover (25) and a valve plate (26), the cylinder cover (25) is fixedly connected to the cylinder (21), and the valve plate (26) is arranged between the cylinder cover (25) and the cylinder (21), the valve plate (26) is provided with a vent hole (261), a one-way valve flap (27) is arranged on the end face of the end of the vent hole (261) away from the cylinder (21), and a groove (262) is arranged on the periphery of the one-way valve flap (27).

10. The two-cylinder air compressor of claim 9, wherein, The area of the groove (262) accounts for more than one third of the area of the valve plate (26).

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