Multi-cylinder piston air compressor structure

Abstract

The invention relates to the technical field of air compressors, in particular to a multi-cylinder piston air compressor structure which comprises a tank body and a machine shell, machine heads are arranged in the machine shell, the multiple machine heads are connected through a communicating pipe, the middle of the communicating pipe is of a soft structure, the two ends of the communicating pipe are rigidly connected to a machine body, and the two ends of the communicating pipe have independent movement ranges. Cooling fins are arranged on the outer wall of the communicating pipe, and the multiple machine heads form a fixing point. The communication pipe has the advantages that the two ends are rigidly connected to the machine head fixing points, a stable installation foundation is provided for the communication pipe, the connection stability of the communication pipe part can be kept, the middle soft structure can buffer vibration transmission generated during cooperative work of the machine heads, meanwhile, the independent movement range can be matched with the tiny movement difference of the machine heads, and the communication pipe is more stable. And rigid pulling of the communicating pipe is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air compressors, and particularly to a multi-cylinder piston air compressor structure. BACKGROUND

[0002] The piston air compressor is a gas compression device widely used in the industrial field, and its core working principle is: through the driving of the motor, the crankshaft makes rotary motion, the crankshaft converts the rotary motion into the reciprocating linear motion of the piston in the cylinder through the connecting rod, and the air suction of the intake chamber, the air compression in the cylinder and the discharge of the compressed air to the exhaust chamber are realized in turn by the reciprocating action of the piston, and finally the compressed air meeting the pressure requirement is output.

[0003] In view of the use requirement of large displacement compressed air, the multi-cylinder structure design is generally adopted in the industry to improve the gas output capacity of the equipment, and the three-cylinder piston air compressor has the advantages of moderate displacement, good power balance performance and compact structure, and is widely used in the manufacturing industry, the construction industry and other fields. The coordinated reciprocating motion of the three cylinders of this type of equipment can significantly improve the output efficiency of compressed air compared with single-cylinder and double-cylinder equipment, and can effectively match the gas supply demand of medium and large pneumatic tools and pneumatic systems.

[0004] It is worth noting that a large amount of compression heat will be generated during the compression process of the three-cylinder piston air compressor, especially the heat carried by the high-pressure compressed air, which is extremely high. If the heat cannot be dissipated in time and efficiently, not only the quality of the compressed air will be affected, but also the overheating damage of the equipment parts may be caused. In order to solve the problem of heat dissipation, the existing technology usually sets a heat sink on the air outlet pipe of the equipment, which increases the heat exchange area by using the heat sink, and cooperates with the cooling air to realize the rapid export of heat.

[0005] However, in the actual application process, the above-mentioned heat dissipation structure has the problem of insufficient heat dissipation efficiency, and the core problem lies in the installation carrier and operation characteristics of the heat sink. When the three-cylinder piston air compressor is running, the reciprocating motion of the crankshaft connecting rod mechanism and the gas pressure pulsation will produce continuous vibration load, which will be directly transmitted to the air outlet pipe, causing the air outlet pipe to drive the heat sink to produce irregular shaking. This shaking will cause the ring surface of the heat sink to deviate, the angle of the ring surface originally adapted to the flow direction of the cooling air changes, and then forms a blocking relationship with the flow direction of the cooling air. The deviated ring surface of the heat sink will produce additional flow resistance to the cooling air, destroy the normal heat exchange path of the cooling air, and the cooling air cannot fully flow through the surface of the heat sink, so the heat exchange efficiency is greatly reduced, and finally the overall heat dissipation effect of the equipment is poor. SUMMARY

[0006] In order to improve the heat dissipation performance of the output gas pipeline, the present application provides a multi-cylinder piston air compressor structure.

[0007] The application provides a multi-cylinder piston air compressor structure, which adopts the following technical scheme: a multi-cylinder piston air compressor structure, comprising a tank body and a machine shell, a machine head is arranged in the machine shell, a plurality of machine heads are connected through a communication pipe, the middle part of the communication pipe is of a soft structure, the two ends of the communication pipe are rigidly connected to the machine body, the two ends of the communication pipe have independent movement ranges, the outer wall of the communication pipe is provided with cooling fins, and the plurality of machine heads form fixed points.

[0008] Through the above technical scheme, the two ends are rigidly connected to the fixed points of the machine head, a stable installation basis is provided for the communication pipe, the connection stability of the communication pipe part can be maintained, the middle soft structure can buffer the vibration transmission generated when the machine heads work cooperatively, the independent movement range can adapt to the slight movement difference of each machine head, and rigid pulling of the communication pipe is reduced; the cooling fins are arranged on the outer wall of the communication pipe and can directly dissipate heat of the compressed air flowing in the pipe, and the stable support of the fixed points can enable the cooling fins to quickly reset to the original state after shaking, guarantee the effective use of the heat dissipation area, and improve the heat dissipation efficiency; in addition, the communication pipe connects a plurality of machine heads to realize airflow integration, reduce airflow loss, and improve the gas output stability of the whole machine.

[0009] Preferably, the machine shell has an air flow area in the horizontal direction, and the machine shell is provided with a retaining frame for keeping the cooling fins parallel to the air flow direction.

[0010] Through the above technical scheme, the horizontal air flow area provides a stable flow path for the cooling air, avoiding uneven heat dissipation caused by airflow turbulence; the retaining frame can forcibly constrain the posture of the cooling fins, ensuring that they are always parallel to the air flow direction, completely eliminating the ring surface deviation caused by shaking, maximizing the reduction of airflow resistance, enabling the cooling air to fully flow through the surface of the cooling fins, and significantly improving the air heat exchange efficiency; at the same time, the stable airflow path and the posture of the cooling fins cooperate to reduce airflow noise and improve the quietness of equipment operation.

[0011] Preferably, the retaining frame comprises a first frame body connected to the machine shell and a support strip arranged on the first frame body, the support strip is located on the side of the communication pipe facing the flowing air, and the support strip is elastically connected to the cooling fins through a connecting piece.

[0012] Through the above technical scheme, the posture stability of the cooling fins is realized while considering vibration buffering. The support strip layout on the windward side can guide the airflow in advance, avoiding additional shaking caused by the direct impact of the airflow on the cooling fins; the elastic connection structure can absorb the vibration energy transmitted to the cooling fins through elastic deformation, further inhibit the shaking of the cooling fins, and compared with rigid connection, can avoid fatigue loosening of the connection part caused by vibration, prolong the service life of the cooling fins and the retaining frame; the elastic connection can also adapt to the thermal expansion and contraction of the cooling fins due to temperature changes, preventing structural deformation and damage.

[0013] Preferably, the support strip is in an arc shape that fits the windward side of the heat sink.

[0014] Through the above technical solution, the arc shape design conforms to aerodynamics, can guide the cooling air to flow smoothly through the surface of the heat sink, avoid the support strip to block the airflow, compared with the straight strip-shaped support strip, reduces the airflow resistance, improves the air heat exchange efficiency; in addition, the fatigue strength of the arc structure is higher, can better withstand the long-term vibration load, prolongs the service life of the support strip.

[0015] Preferably, the connecting piece includes an elastic body provided on the support strip, and the heat sink has a connecting boss connected to the elastic body.

[0016] Through the above technical solution, the elastic body as a vibration buffering core component can accurately absorb vibration load in different directions, further improving the stability of the heat sink.

[0017] Preferably, the elastic body is arranged on the inner side of the support strip, and the elastic body is combined with the connecting boss through a connecting stud.

[0018] Preferably, the elastic body has a transition portion in the middle, and the diameter of the transition portion is smaller than that of the elastic body on both sides.

[0019] Through the above technical solution, the transition portion design of the elastic body in the middle is reduced, which significantly optimizes the buffering performance of the elastic body. The diameter of the transition portion is reduced, so that the deformation of the elastic body is concentrated in this area, improving the absorption efficiency of the vibration, especially the periodic high-frequency vibration generated during the operation of the three-cylinder machine. More accurate buffering can be achieved.

[0020] Preferably, the elastic body has a connecting hole penetrating in the air flow direction, the connecting boss includes a first part body limited on the back side of the elastic body and a second part body penetrating in the connecting hole, and the diameter of the second part body is slightly larger than that of the connecting hole.

[0021] Through the above technical solution, the connecting boss is inserted and connected during installation, thereby simplifying the connection mode, and the second part body can realize the limiting effect.

[0022] Preferably, the support strip has a blocking strip inserted on both sides of the transition portion, and the blocking strip is separated from the support strip after the connecting boss passes through the connecting hole, for releasing the activity space on the side of the transition portion.

[0023] Through the technical scheme, in the assembly stage, the blocking strip is located on both sides of the transition part, can fix the posture of the elastic body, make the connecting hole and the connecting boss accurately aligned, reduce the assembly difficulty, and improve the assembly precision; after the assembly is completed, the blocking strip is pulled out, the activity space of the transition part is released, the transition part of the elastic body can be freely deformed, the core role of buffering vibration is fully played, and the performance of the elastic body is avoided by the blocking strip. The design realizes the consideration of assembly convenience and use performance, and improves the production efficiency and reliability of the product.

[0024] Preferably, the elastic body is provided with two arc-shaped direction interval support strips.

[0025] Through the technical scheme, two connection points can keep the direction of the heat dissipation fin during vibration; compared with a single elastic body, the redundant design of the double elastic body can improve the structural reliability, even if one of the elastic bodies fails, the other can still temporarily maintain the supporting function.

[0026] In summary, the present application has at least one of the following beneficial technical effects: the two ends are rigidly connected to the head fixed point, providing a stable mounting basis for the connecting pipe, so that the connecting pipe part can keep the connection stability, the intermediate soft structure can buffer the vibration transmission generated during the cooperation of the head, and the independent motion range can adapt to the small motion difference of each head, reducing the rigid pulling of the connecting pipe; the heat dissipation fin is arranged on the outer wall of the connecting pipe, which can directly dissipate heat for the compressed air flowing in the pipe, and cooperate with the stable support of the fixed point, so that the heat dissipation fin can quickly reset to the original state after shaking, guaranteeing the effective use of the heat dissipation area and improving the heat dissipation efficiency; in addition, the connecting pipe connects multiple heads to realize airflow integration, reduces airflow loss, and improves the gas output stability of the whole machine. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of embodiment 1 of the present application; Figure 2 is a schematic diagram of the internal structure of the shell of embodiment 1 of the present application; Figure 3 is a structural schematic diagram of the connecting pipe of embodiment 1 of the present application; Figure 4 is a sectional view of the connecting pipe of embodiment 2 of the present application; Figure 5 is a sectional view of the connecting pipe of embodiment 3 of the present application, with a blocking strip; Figure 6 is a sectional view of the connecting pipe of embodiment 3 of the present application, without a blocking strip.

[0028] Reference numerals: 100, tank body; 110, casing; 111, machine head; 112, communication pipe; 113, cooling fan; 114, air outlet; 115, first frame body; 116, support strip; 117, heat sink; 120, elastic body; 121, connecting boss; 122, threaded hole; 123, connecting stud; 124, transition portion; 125, first part body; 126, second part body; 127, accommodating groove; 130, connecting hole; 131, blocking strip. DETAILED DESCRIPTION

[0029] The application will be further described in detail below with reference to the accompanying drawings.

[0030] Example 1: Reference Figure 1 、 Figure 2 A multi-cylinder piston air compressor structure includes a tank body 100 and a casing 110, and the casing 110 is provided with a machine head 111. In this embodiment, the air compressor is a three-cylinder machine, and multiple machine heads 111 are connected through a communication pipe 112. The middle part of the communication pipe 112 is of a soft structure, and the two ends of the communication pipe 112 are rigidly connected to the machine body. The communication pipe 112 is used to output the compressed gas in the cylinder body, and the two ends are metal connecting parts, while the middle part is a soft connection.

[0031] During operation, the two ends of the communication pipe 112 have independent movement ranges, that is, they can vibrate with the three-cylinder machine. The soft connection of the middle part can adapt to the vibration condition. The outer wall of the communication pipe 112 is provided with heat sinks 117, and multiple machine heads 111 form fixed points.

[0032] The casing 110 has an air flow area in the horizontal direction, one side of which is provided with a cooling fan 113, and the other side is provided with an air outlet 114 corresponding to each machine body, forming air flow in the horizontal direction. The outer wall of the communication pipe 112 is provided with heat sinks 117, and the setting position of the heat sinks 117 is parallel to the air flow direction, which can better dissipate heat.

[0033] The two ends are rigidly connected to the fixed points of the machine head 111, providing a stable installation basis for the communication pipe 112, so that the communication pipe 112 part can maintain connection stability. The middle soft structure can buffer the vibration transmission generated when the machine head 111 works cooperatively. At the same time, the independent movement range can adapt to the slight motion difference of each machine head 111, reducing the rigid pulling of the communication pipe 112. The heat sinks 117 are arranged on the outer wall of the communication pipe 112, which can directly dissipate heat for the compressed air flowing in the pipe. With the stable support of the fixed points, the heat sinks 117 can quickly reset to the original state after shaking, ensuring the effective use of the heat dissipation area and improving the heat dissipation efficiency. In addition, the communication pipe 112 connects multiple machine heads 111 to realize air flow integration, reduce air flow loss, and improve the gas output stability of the whole machine.

[0034] Example 2: The difference from Example 1 is that, referring to... Figure 4 Under normal circumstances, due to the offset of the drive shaft of the three cylinders inside the housing 110, the connecting pipe 112 extends in a non-linear manner, resulting in a distance difference between the two ends of the connecting pipe 112 in the direction of airflow. This causes the connecting pipe 112 to vibrate with a larger amplitude and an uncertain direction during vibration. In order to maintain the orientation of the heat sink 117 during high-frequency vibration, the housing 110 is provided with a retainer to keep the heat sink 117 parallel to the direction of airflow.

[0035] Therefore, in this embodiment, the heat sink 117 is dynamically kept parallel to the airflow direction by means of the elastic body 120. The retainer includes a first frame 115 connected to the housing 110 and a support bar 116 disposed on the first frame 115. The support bar 116 is located on the side of the connecting pipe facing the airflow. In this embodiment, the first frame 115 is a long rod to minimize the impact on airflow. The support bar 116 will be located on the windward side of the connecting pipe 112, and the support bar 116 is arc-shaped to reduce the impact on airflow.

[0036] The support bar 116 is elastically connected to the heat sink 117 via a connector. The connector includes an elastic body 120 disposed on the support bar 116. In this embodiment, the elastic body 120 is made of rubber and silicone. The elastic body 120 enables dynamic changes in the heat sink 117, but also allows the heat sink 117 to return to a parallel airflow state through its elasticity. In actual operation, the two ends of the connecting pipe 112 move with the body, and the retainer will also move synchronously with the housing 110. At this time, due to the presence of the elastic body 120, the heat sink 117 can change as much as possible, and can dynamically reset without affecting the overall rigidity.

[0037] For easy installation, the heat sink 117 has a connecting boss 121 connected to the elastic body 120. The connecting boss 121 is integrally connected to the heat sink 117. In this embodiment, two elastic bodies 120 are spaced apart along the arc direction of the support bar 116. In the initial state, the two elastic bodies 120 keep the heat sink 117 in a vertical state, and during subsequent vibration, they will return to their initial state. The two connection points are arranged along the arc. The back side of the support bar 116 has a threaded hole 122 for connecting the connecting boss 121 with a connecting stud 123. The connecting stud 123 will vibrate with the heat sink 117.

[0038] Example 3: Reference Figure 5 , Figure 6The difference from Embodiment 2 is that the elastomer 120 has a transition portion 124 in the middle, and the diameter of the transition portion 124 is smaller than that on both sides of the elastomer 120. The transition portion 124 can ensure that the heat sink 117 has a larger deformation during the movement. Specifically, the periphery of the elastomer 120 is circular, similar to a cylinder. There is a receiving groove 127 inside the support bar 116. The outer end of the elastomer 120 near the receiving groove 127 has a distance between it and the receiving groove 127, that is, it can move freely. The other end will be fixed to the bottom of the receiving groove 127 for fixation. The middle transition portion 124 provides better mobility.

[0039] The elastomer 120 has a connecting hole 130 extending along the airflow direction. The connecting boss 121 includes a first part 125 located on the back side of the elastomer 120 and a second part 126 passing through the connecting hole 130. The diameter of the second part 126 is slightly larger than that of the connecting hole 130. There is a gap between the bottom of the receiving groove 127 and the elastomer 120. This gap is used for the second part 126 to be inserted, and the depth of this gap along the receiving groove 127 is greater than that of the second part 126. When the connecting boss 121 is inserted, it can swing relatively freely with vibration. It can swing with movement, but it can also return to its original shape. During installation, the heat sink 117 of the elastomer 120 is pressed down so that the first part 125 and the second part 126 pass through the connecting hole 130. The second part 126 is inserted into the receiving groove 127, and the larger second part 126 forms a limit. Compared with the connecting stud 123 in embodiment 2, this is more convenient.

[0040] However, due to the presence of the transition portion 124, the elastic body 120 itself deforms during pressing and connection, which may cause twisting or breakage, leading to difficulty in insertion. Therefore, in this embodiment, during installation, a blocking strip 131 located on both sides of the transition portion 124 is inserted into the support strip 116 (see reference). Figure 5 This means that the blocking strip 131 completely passes through the entire support strip 116. The blocking strip 131 can be made of plastic or metal, but it is flexible and deformable to adapt to the non-linear connecting pipe 112. When pressed, the blocking strip 131 acts as a rigid support for the elastic body 120 and can pass through the connecting hole 130 well.

[0041] After the connecting boss 121 passes through the connecting hole 130, the blocking strip 131 is pulled out from the support strip 116 (see reference). Figure 6 This is used to release the movement space around the transition section 124. In this way, the blocking strip 131 can provide support during installation and, after installation, can be removed to form a follow-up elastic movable connection for the heat sink 117.

[0042] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-cylinder piston air compressor structure, comprising a tank (100) and a housing (110), wherein an air compressor head (111) is disposed within the housing (110), characterized in that: Multiple machine heads (111) are connected by a connecting pipe (112). The middle part of the connecting pipe (112) is a soft structure. Both ends of the connecting pipe (112) are rigidly connected to the machine body. Both ends of the connecting pipe (112) have independent range of motion. The outer wall of the connecting pipe (112) has heat sinks (117). Multiple machine heads (111) form a fixed point.

2. The multi-cylinder piston air compressor structure according to claim 1, characterized in that: The housing (110) has an airflow area along the horizontal direction inside, and the housing (110) is provided with a retainer for keeping the heat sink (117) parallel to the airflow direction.

3. The multi-cylinder piston air compressor structure according to claim 2, characterized in that: The retainer includes a first frame (115) connected to the housing (110) and a support bar (116) disposed on the first frame (115). The support bar (116) is located on the side of the connecting pipe (112) facing the flowing air. The support bar (116) is elastically connected to the heat sink (117) through a connector.

4. The multi-cylinder piston air compressor structure according to claim 3, characterized in that: The support bar (116) is in an arc shape that fits against the windward side of the heat sink (117).

5. The multi-cylinder piston air compressor structure according to claim 4, characterized in that: The connector includes an elastomer (120) disposed on the support bar (116), and the heat sink (117) has a connecting boss (121) connected to the elastomer (120).

6. The multi-cylinder piston air compressor structure according to claim 5, characterized in that: The elastic body (120) is disposed inside the support bar (116), and the elastic body (120) is combined with the connecting boss (121) by the connecting stud (123).

7. The multi-cylinder piston air compressor structure according to claim 5, characterized in that: The elastomer (120) has a transition section (124) in the middle, and the diameter of the transition section (124) is smaller than that of the two sides of the elastomer (120).

8. The multi-cylinder piston air compressor structure according to claim 7, characterized in that: The elastomer (120) has a connecting hole (130) extending through the airflow direction. The connecting boss (121) includes a first part (125) located on the back side of the elastomer (120) and a second part (126) passing through the connecting hole (130). The diameter of the second part (126) is slightly larger than that of the connecting hole (130).

9. The structure of a multi-cylinder piston air compressor according to claim 8, characterized in that: The support bar (116) is inserted with blocking bars (131) located on both sides of the transition part (124). After the connecting boss (121) passes through the connecting hole (130), the blocking bars (131) are pulled out from the support bar (116) to release the movement space around the transition part (124).

10. A multi-cylinder piston air compressor structure according to claim 6 or 9, characterized in that: Two elastic bodies (120) are spaced apart along the arc direction of the support bar (116).

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