Piston body in the cylinder of an air compressor

Abstract

The present application provides a kind of piston body in the cylinder of air compressor, especially refers to a kind of piston body installed in air compressor, the intake blocking piece is installed in its piston head, the gap is formed between the flat surface of the piston head and the intake blocking piece, the air passage of piston body is smooth, so that the pressure in the cylinder is balanced with the surrounding atmosphere, when the piston body of air compressor is started again, there is no obstruction and it is more smooth when the piston body is in the upstroke, so that the piston body can maintain better efficiency compression performance when reciprocating in the cylinder, and more has use safety and prolongs its service life, and can more easily and quickly fill the air of the object to be filled.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of air compressor, in particular to a piston body capable of upstroke and downstroke in the cylinder of air compressor. BACKGROUND

[0002] The main structure of air compressor is to drive the piston body in the cylinder by motor to perform reciprocating compression, and the compressed air can be delivered from the cylinder to the air storage seat, and then connected to the transmission hose connected to the air-filled object through the manifold on the air storage seat. The existing piston body is provided with an air passage which is penetrated by the piston head, so that the air in the cylinder and the outside environment can flow. The air passage of the piston head is covered with an air inlet shutter. When the air compressor is in the state of shutdown, the air inlet shutter closes the air passage of the piston head. When the air compressor is restarted from the static state, the air-tightness formed by the air-tight ring arranged on the circular periphery of the piston head and the air passage closed by the air inlet shutter of the piston head increases the resistance of the residual pressure in the cylinder when the piston body is pushed, which forms the effect of high current surge. The traditional automobile power supply will be stopped due to the fuse blown caused by high current surge during use. In view of the current development trend of electric vehicles in response to the concept of environmental protection, the intelligent electric vehicle will immediately cut off the power output when high current surge occurs under the requirement of the protection mechanism of the microcomputer system for power use, resulting in the air compressor stopping working and losing function. Therefore, the inventor has developed a gap between the top surface of the piston head and the air inlet shutter when the air compressor is in the state of shutdown. After the air compressor is finished, the compressed air remaining in the cylinder can be discharged through the gap, the air inlet passage and the air passage, so that the pressure in the cylinder is balanced with the surrounding atmosphere, and the piston body will not be hindered when the air compressor is restarted, avoiding the generation of instantaneous high current surge, so that the piston body can move smoothly in the cylinder, and the use safety and service life are improved, and the air-filled object can be filled with air more easily and quickly. The air compressor can be easily started when it stops working under any pressure, and the fuse of the traditional automobile power supply will not be blown due to high current surge, or the intelligent electric vehicle will immediately cut off the power output when high current surge occurs under the requirement of the protection mechanism of the microcomputer system for power use, resulting in the air compressor stopping working and losing function. SUMMARY

[0003] The main purpose of the present application is to provide a piston body in the cylinder of an air compressor, in particular, the piston head of the piston body is provided with an air inlet channel penetrating up and down, the periphery of the air inlet channel is formed with a flat plate on the top surface of the piston head, at least one convex body with a height is provided on the flat plate, the convex body is in contact with the air inlet blocking piece fixed on the piston head, so that the air inlet blocking piece and the flat plate of the piston head form a gap, the air inlet channel is unobstructed, the pressure in the cylinder is balanced with the atmospheric pressure, and when the piston body is in a static state, the residual pressure remaining in the cylinder can be discharged.

[0004] Another main purpose of the present application is to provide a piston body structure, at least one convex body with a height and protruding from the flat plate of the piston head of the piston body can be different in shape and size, as long as the convex body protrudes from the flat plate in a vertical direction and has a height, a gap is formed between the piston head and the air inlet blocking piece.

[0005] Still another main purpose of the present application is to provide a piston body structure, the piston head forms a gap, which is sufficient to discharge the residual pressure in the cylinder, so that when the compression stroke starts or restarts in a static state, the effect of high current surge caused by the increased resistance of the piston body when it is pushed upward by the residual pressure in the cylinder can be prevented, and the air compressor can be directly prevented from stopping working due to the fuse being blown by high current surge when it is connected to a traditional automobile power supply, or the air compressor can be directly prevented from being stopped working due to the power supply being immediately cut off by the microcomputer system of a pure environmentally friendly electric vehicle when high current surge occurs, so that the air compressor loses its function. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 It is a perspective exploded view of the piston body of the present application;

[0007] Figure 2 It is a perspective view of the piston body of the present application;

[0008] Figure 3 It is a partial enlarged perspective view of the piston body of the present application with an air inlet blocking piece installed;

[0009] Figure 4 It is a partial enlarged view of the piston body and the air inlet blocking piece of the present application;

[0010] Figure 5 It is a partial enlarged sectional view of the piston body of the present application;

[0011] Figure 6 It is a schematic view of the air compressor of the present application arranged in a box body;

[0012] Figure 7Fig. 2 is a sectional view of the lower stroke of the piston body of the present application;

[0013] Figure 8 Fig. 3 is an enlarged view of the upper stroke of the piston body of the present application;

[0014] Figure 9 Fig. 4 is a perspective view of another piston body of the present application;

[0015] Figure 10 Fig. 5 is an enlarged view of the lower stroke of the piston body of the present application;

[0016] Figure 11 Fig. 6 is an enlarged view of the upper stroke of the piston body of the present application;

[0017] Figure 12 Fig. 7 is an enlarged view of the lower stroke of the piston body of the present application;

[0018] Figure 13 Fig. 8 is an enlarged view of the upper stroke of the piston body of the present application;

[0019] Figure 14 Fig. 9 is a perspective view of another piston body of the present application;

[0020] Figure 15 Fig. 10 is an enlarged view of the lower stroke of the piston body of the present application;

[0021] Figure 16 Fig. 11 is an enlarged view of the upper stroke of the piston body of the present application.

[0022] BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 1: case body

[0024] 10: air compressor

[0025] 11: base plate

[0026] 12: motor

[0027] 13: cylinder

[0028] 14: transmission mechanism

[0029] 141: crank shaft

[0030] 15: air reservoir

[0031] 16: pressure gauge

[0032] 2: piston body

[0033] 21: piston head

[0034] 211, 212: fixing pin;

[0035] 213: T-shaped protrusion;

[0036] 214: positioning protrusion;

[0037] 215, 216: protrusion;

[0038] 22: limiting hook;

[0039] 221: vertical column;

[0040] 222: horizontal column;

[0041] 23: air inlet channel;

[0042] 3: air-tight ring;

[0043] 4: piston rod;

[0044] 41: circular hole;

[0045] 42: air channel;

[0046] 5: flat surface;

[0047] 51: gap;

[0048] 6: piston head;

[0049] 61: air inlet channel;

[0050] 62: flat surface;

[0051] 63: fixing pin;

[0052] 64: protrusion;

[0053] 65: air inlet blocking piece;

[0054] 66: gap;

[0055] 7: air inlet blocking piece;

[0056] 71: annular inner space;

[0057] 72: outer ring segment;

[0058] 721: recessed clamping groove;

[0059] 73: inner circle segment;

[0060] 74: neck segment;

[0061] 75: through hole;

[0062] 76, 77: circular hole;

[0063] 8: piston head;

[0064] 81: air inlet channel;

[0065] 82: flat surface;

[0066] 83: fixing pin;

[0067] 84: convex body;

[0068] 85: air inlet baffle;

[0069] 86: gap;

[0070] 9: piston head;

[0071] 91: flat surface;

[0072] 92: fixing pin;

[0073] 93: air inlet channel;

[0074] 94: annular convex body;

[0075] 95: air inlet baffle;

[0076] 96: gap. DETAILED DESCRIPTION

[0077] Reference will now be made in detail to the exemplary embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used in the drawings and the description to refer to the same or like parts.

[0078] Please refer to Figure 6 As shown in the drawings, the air compressor 10 of the present application can be arranged in the box body 1, which can be used for air charging. The air compressor 10 comprises a base plate 11 for fixing a motor 12, a cylinder 13 combined with the base plate 11, and a transmission mechanism 14 of the air compressor 10 arranged on the base plate 11. The transmission mechanism 14 is connected with a piston body 2. The transmission mechanism 14 is driven to rotate by a crankshaft 141 of the motor 12, and the piston body 2 is driven to perform upstroke and downstroke actions in the cylinder 13 to generate compressed air. The compressed air can be pushed into a gas storage seat 15, and then can enter a pressure display meter 16 through the arrangement of a gas delivery manifold, so as to display the pressure. The compressed air can be used to charge an article to be charged (not shown in the drawings) through the connection of a gas delivery hose. However, the above-mentioned air compressor 10 is currently used in the state, and thus the detailed structure is not shown and will not be described here.

[0079] The most important structural feature of the present application is that at least one convex body with height and protruding from the flat surface 5 of the piston head 21 of the piston body 2 of the air compressor 10, the convex body can be different shapes and different sizes, but as long as the convex body protrudes from the aforementioned flat surface 5 in a perpendicular direction and has a height, so that the aforementioned piston head 21 and the intake valve 7 form a gap 51, the aforementioned convex body is set in the range of the flat surface 5 covered by the aforementioned intake valve 7, and the gap 51 is sufficient to allow the residual pressure in the cylinder 13 to be discharged, so that when each compression stroke starts or restarts from the static state, it can prevent the effect of high current surge caused by the increased resistance of the piston body 2 when it is pushed upward due to the residual pressure in the cylinder 13, which can directly avoid the air compressor 10 when connected to the traditional car power supply, the fuse is blown and stopped working due to high current surge, or because the pure environmental protection electric vehicle immediately cuts off the power output when high current surge occurs due to the protection mechanism of the microcomputer system for power use, so that the air compressor 10 is stopped working and loses its function.

[0080] The technical feature of at least one convex body on the top surface of the piston head 21 of the present application is described as follows. Please refer to Figures 1 to 5As shown, the piston body 2 in the cylinder 13 of the air compressor 10 of the present application, which comprises a piston head 21 and its associated piston rod 4, the top end of the piston head 21 is provided with an air inlet passage 23 which penetrates through the piston head 21 from top to bottom, and the top surface of the piston head 21 is formed with a flat plate surface 5, the side edge of the top end of the piston head 21 is provided with two separate fixed pins 211, 212, a T-shaped protrusion 213 with a positioning protrusion 214 is interposed between the fixed pins 211, 212, and the other side edge of the top end of the piston head 21 is provided with a limiting hook 22. The flat plate surface 5 on the two side edges of the piston head 21 which take the T-shaped protrusion 213 and the limiting hook 22 as the center lines can be respectively provided with protrusions 215, 216, which are preferably arranged in a symmetrical manner, and the protrusions 215, 216 are in the form of strips. The protrusions 215, 216 are higher than the horizontal level of the flat plate surface 5 but lower than the vertical column 221 of the limiting hook 22, and the outer periphery of the piston head 21 is provided with an air-tight ring 3 which realizes continuous sealing around the inner surface of the piston body 2 and the cylinder 13 during the operation of the air compressor 10. The piston rod 4 which extends downward from the piston head 21 is provided with a circular hole 41 at the lower end to be pivotally connected with the crankshaft 141 in the transmission mechanism 14, and the upper end of the piston rod 4 is provided with an air passage 42 which can be connected with the atmosphere, so that the air inlet passage 23 and the air passage 42 are connected. The air inlet blocking piece 7 can be arranged on the flat plate surface 5 of the piston head 21, one end of which is fixed on the fixed pins 211, 212 of the flat plate surface 5, and since the positioning protrusion 214 of the T-shaped protrusion 213 can fit into the recessed clamping groove 721 of the air inlet blocking piece 7, it is easy to identify when the assembly is performed by an AI robot, and there is no problem of reverse assembly or reverse placement, which is beneficial to the assembly efficiency of the product. When the air compressor 10 is in a stopped state, the air inlet blocking piece 7 abuts against the two protrusions 215, 216 on the flat plate surface 5 so that there is a gap 51 between the air inlet blocking piece 7 and the flat plate surface 5, and the air inlet passage 23 is unblocked so that the pressure in the cylinder 13 is balanced with the atmospheric pressure, and when the piston body 2 is in a static state, the residual pressure remaining in the cylinder 13 can be discharged, as shown. Figure 3

[0081] Please refer to Figure 1 and Figure 2 ​As shown, the intake baffle 7 of the present invention has a non-circular annular inner cavity 71 cut through its inner circumferential solid, and the intake baffle 7 is subdivided into an outer ring segment 72 and an inner circle segment 73. The outer ring segment 72 and the inner circle segment 73 form a neck segment 74 at the connection point. The intake baffle 7 has a through hole 75 on the outer ring segment 72 near the neck segment 74. The piston head 21 has a limiting hook 22 at a position corresponding to the through hole 75 and engages with the through hole 75. The two fixing pins 211 and 212 on the piston head 21 are separated by circular holes 76 and 77 on the intake baffle 7. The circular holes 76 and 77 of the intake baffle 7 are used to position the fixing pins 211 and 212 of the piston head 21, respectively, and simultaneously allow passage. The T-shaped protrusion 213 of the aforementioned piston head 21 abuts against the outer edge of the outer ring segment 72 of the intake baffle 7, and the positioning protrusion 214 of the aforementioned T-shaped protrusion 213 is engaged with the recessed groove 721 on the outer edge of the outer ring segment 72 of the intake baffle 7, so that the intake baffle 7 can be firmly positioned on the piston head 21. The structure of the positioning protrusion 214 of the T-shaped protrusion 213 can serve as a function to identify the installation and positioning direction of the intake baffle 7 during the assembly operation, because if the intake baffle 7 is assembled in reverse, it may adversely affect the function of the piston body 2 and reduce the working efficiency of the piston body 2. When the piston body 2 of the air compressor 10 is in a stopped and stationary state, the outer ring segment 72 of the intake baffle 7 abuts against the two protrusions 215 and 216 on the aforementioned piston head 21. Figures 3 to 5 As shown, a gap 51 exists between the intake baffle 7 and the flat plate 5 of the piston head 21, and the inner circular segments 73 of the intake baffle 7 remain open relative to the intake passage 23 and the air passage 42. The unobstructed intake passage 23 of the piston body 2 allows the pressure in the cylinder 13 to balance with the surrounding atmosphere. This ensures that during each compression stroke, or when restarting from a standstill, the piston body 2 experiences no obstruction (back pressure resistance) during the upward stroke. This allows the piston body 2 to maintain smooth compression efficiency during reciprocating motion within the cylinder 13. Compared to traditional automotive power supplies, where high current surges cause fuse blowouts and shutdowns, or pure electric vehicles where the microcomputer system's power protection mechanism immediately cuts off power output during high current surges, causing the air compressor 10 to stop working and lose function, the design of the protrusion on the flat plate 5 in this invention has excellent effects. During the upward stroke of the piston body 2, as... Figure 8 As shown, the inner circular segment 73 of the intake baffle 7 is attached to the flat plate surface 5 of the aforementioned piston head 21, so that the intake baffle 7 closes the intake passage 23 and the air passage 42; while the piston body 2 in the downward stroke as Figure 7As shown, the air intake blocking sheet 7 tends to increase the opening width due to the external air thrust, but is limited by the transverse column 222 of the limiting hook 22, so as to avoid the uncontrolled opening of the air intake blocking sheet 7, which is likely to cause fatigue and damage of the air intake blocking sheet 7. When the piston body 2 is at rest, the air intake blocking sheet 7 and the top surface of the piston head 21 are kept in an open state, and the through hole 75 of the air intake blocking sheet 7 is stopped by the transverse column 222 of the limiting hook 22. The vertical column 221 of the limiting hook 22 provides a path for the opening and closing of the air intake blocking sheet 7, so that the length (or height) of the vertical column 221 and the design of the transverse column 222 can be adjusted according to the power of the air compressor 10 to adjust the initial height of the air intake blocking sheet 7. Since the power supply connected to the air compressor 10 may have a higher or lower voltage than the default reference voltage of the air compressor 10 in various possible situations, a higher voltage input will relatively increase the speed of the motor 12 of the air compressor 10, and the frequency of the reciprocating cycle of the piston body 2 will also be higher, so that the air flow speed pushing the air intake blocking sheet 7 away from below the air intake blocking sheet 7 will increase, the air intake blocking sheet 7 will be lifted higher, and the bending angle will be larger. The excessive bending angle and high frequency of the air intake blocking sheet 7 will greatly reduce the service life of the air intake blocking sheet 7, directly reducing the service life of the air compressor 10. The limiting hook 22 is used to limit the amplitude height of the air intake blocking sheet 7 to avoid excessive bending angle and high frequency of the air intake blocking sheet 7, so as to effectively protect the service life of the air intake blocking sheet 7.

[0082] As shown in the drawings, Figures 9 to 11 As shown, another embodiment of the piston body of the present application is provided with an air intake passage 61 passing through the top of the piston head 6, and a flat plate surface 62 is formed on the top surface of the piston head 6 around the air intake passage 61. At least one fixed pin 63 and at least one convex body 64 with a height are arranged on the flat plate surface 62. The convex body 64 can be in the shape of a column, a semicircle, a square, a triangle, etc. The convex body 64 is located between the air intake passage 61 and the fixed pin 63. An air intake blocking sheet 65 is arranged on the flat plate surface 62 of the piston head 6, with one end fixed to the fixed pin 63 of the flat plate surface 62. The convex body 64 is in contact with the air intake blocking sheet 65 fixed to the piston head 6, so that the air intake blocking sheet 65 and the flat plate surface 62 of the piston head 6 form a gap 66. The air intake passage 61 is unblocked, so that the pressure in the cylinder 13 is balanced with the atmospheric pressure. At the beginning of each compression stroke or when the piston body is at rest, the residual pressure in the cylinder 13 is discharged, and the air intake blocking sheet 65 is lifted to the top of the piston head 6. Figure 11 As shown, the air intake blocking sheet 65 is attached to the flat plate surface 62 of the piston head 6, so that the air intake blocking sheet 65 closes the air intake passage 61.

[0083] Referring to Figure 12 and Figure 13 , another embodiment of the piston body of the present application is shown, which is different from the embodiments of the piston body shown in Figure 1 and Figure 9 , the top end of the piston head 8 of the piston body is provided with an air inlet passage 81 which penetrates the piston head 8 from top to bottom, and the outer periphery of the air inlet passage 81 is formed with a flat plate surface 82 on the top surface of the piston head 8, at least one fixed pin 83 and at least one convex body 84 with a height are provided on the flat plate surface 82, the position of the at least one convex body 84 provided on the flat plate surface 82 is not between the air inlet passage 81 and the fixed pin 83, but is provided on the other side of the air inlet passage 81 relative to the fixed pin 83, an air inlet blocking piece 85 can be provided on the flat plate surface 82 of the piston head 8, one end of the air inlet blocking piece 85 is fixed on the fixed pin 83 of the flat plate surface 82, the convex body 84 is in contact with the air inlet blocking piece 85 fixed on the piston head 8, so that the air inlet blocking piece 85 and the flat plate surface 82 of the aforementioned piston head 8 form a gap 86, the air inlet passage 81 is unblocked, so that the pressure in the cylinder 13 is balanced with the atmospheric pressure, at the beginning of each compression stroke or when the piston body is in a static state, the residual pressure remaining in the cylinder 13 is discharged, and at the upstroke of the piston body (as shown in Figure 13 , the air inlet blocking piece 85 is attached to the flat plate surface 82 of the aforementioned piston head 8, so that the air inlet blocking piece 85 closes the air inlet passage 81.

[0084] Referring to Figures 14 to 16 , another embodiment of the piston body of the present application is shown, which is different from the embodiments of the piston body shown in Figure 1 , Figure 9 and Figure 12 , the top end of the piston head 9 of the piston body is formed with a flat plate surface 91, a fixed pin 92 is provided at the center of the flat plate surface 91, a plurality of air inlet passages 93 which penetrate the top and bottom ends of the aforementioned piston head 9 are provided at the circumferential edge adjacent to the flat plate surface 91, and a ring-shaped convex body 94 is further provided on the flat plate surface 91 with the center of the circle as the center point and outside the periphery of the circle, which is located between the circularly arranged air inlet passages 93 and the fixed pin 92, an air inlet blocking piece 95 can be positioned on the fixed pin 92 of the flat plate surface 91 of the piston head 9, the ring-shaped convex body 94 is in contact with the air inlet blocking piece 95 fixed on the piston head 9, so that the air inlet blocking piece 95 and the flat plate surface 91 of the piston head 9 form a gap 96, the air inlet passages 93 are unblocked, so that the pressure in the cylinder 13 is balanced with the atmospheric pressure, at the beginning of each compression stroke or when the piston body is in a static state, the residual pressure remaining in the cylinder 13 is discharged, and the upstroke of the piston body (as shown in Figure 16 ) can allow the aforementioned air inlet blocking piece 95 to close the air inlet passages 93, and at the downstroke of the piston body and when the piston body is static (as shown in Figure 15When the air compressor 10 is in the state of stopping, the piston head 21 of the piston body 2 is in the state of stopping, and the intake valve 7 is in the state of stopping, the residual pressure in the cylinder 13 can be discharged through the gap 51 and the intake passage 93, and the pressure in the cylinder 13 is balanced with the atmospheric pressure.

[0085] In summary, in the state of stopping of the air compressor 10, the flat surface 5 of the top end of the piston head 21 of the piston body 2 is provided with at least one convex body protruding from the flat surface 5 and having a height, which can be different in shape and size. However, the convex body protrudes from the flat surface 5 in the vertical direction and has a height, so that the gap 51 is formed between the piston head 21 and the intake valve 7, which is sufficient to discharge the residual pressure in the cylinder 13. When the compression stroke starts or restarts in the state of stopping, the effect of high current surge caused by the increased resistance of the piston body 2 when it is pushed upward by the residual pressure in the cylinder 13 can be prevented. The air compressor 10 connected to the traditional automobile power supply can directly avoid the fuse from being blown due to high current surge, or the air compressor 10 connected to the pure electric vehicle can directly avoid the power supply from being cut off due to high current surge, so that the air compressor 10 is stopped and loses its function. The technical design of the present application is novel and progressive.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the embodiments can be modified, or some or all of the technical features can be replaced by equivalent alternatives. The modification or replacement does not change the essence of the corresponding technical solution, which is within the scope of the technical solutions of the embodiments of the present application.

Claims

1. A piston body in a cylinder of an air compressor, the air compressor having a piston body that is drivable by a motor and that is reciprocated up and down in the cylinder, characterized in that: The piston head of the piston body is provided with an air inlet channel penetrating upward and downward, the top end of the piston head is formed with a flat plate surface, at least one protrusion is provided on the flat plate surface around the air inlet channel of the piston head, the protrusion is higher than the horizontal plane of the flat plate surface, an air inlet baffle is provided on the flat plate surface of the piston head, the air inlet baffle is in contact with the protrusion provided on the flat plate surface, so that the air inlet baffle and the flat plate surface have a gap, when the air compressor is finished operating, the compressed air remaining in the cylinder can be discharged through the gap, when the compression stroke starts or restarts from the static state, the piston body will not be hindered during the upstroke, The at least one protrusion includes a plurality of protrusions, the shapes of the plurality of protrusions are the same or different, the volumes of the plurality of protrusions are the same or different, the plurality of protrusions protrude in a perpendicular direction from the flat plate surface and have a height, so that the gap is formed between the piston head and the air inlet baffle, the protrusion is provided in the range of the flat plate surface covered by the air inlet baffle, the gap allows the residual pressure in the cylinder to be discharged, The side edge of the top end of the piston head is provided with a T-shaped protrusion, the other side edge of the top end of the piston head is provided with a limiting hook, the flat plate surface of the piston head is provided with the protrusions on the two side edges with the T-shaped protrusion and the limiting hook as the center line, the plurality of protrusions are oppositely arranged, the protrusions are strip-shaped, the protrusions are higher than the horizontal plane of the flat plate surface but lower than the height of the vertical column of the limiting hook, The air inlet baffle is provided with a non-full circular annular hollow area in the inner entity, and the air inlet baffle is divided into an outer ring part and an inner circle part.

2. The piston body in the cylinder of an air compressor according to claim 1, characterized in that, The side edge of the top end of the piston head is provided with two separate fixed pins, the T-shaped protrusion containing a positioning protrusion is between the two fixed pins, the limiting hook is used to limit the amplitude height of the air inlet baffle, one end of the air inlet baffle is fixed on the fixed pin of the flat plate surface.

3. The piston body in the cylinder of an air compressor according to claim 1, characterized in that, The piston rod extending downward from the piston head is provided with an air channel communicating with the atmosphere, the air channel is connected with the air inlet channel of the piston head; the air-tight ring is mounted on the outer periphery of the piston head, and the air-tight ring realizes continuous sealing around the inner surface of the piston body and the cylinder during operation of the air compressor.

4. The piston body in the cylinder of an air compressor according to claim 2, characterized in that, The limiting hook on the piston head includes the vertical column and the horizontal column, the vertical column provides a path for opening and closing of the air inlet baffle.

5. The piston body in the cylinder of an air compressor according to claim 4, characterized in that, The outer ring segment and the inner circle segment form a neck segment at the joint, the intake blocking segment is provided with a through hole penetrating the outer ring segment near the neck segment, the piston head is provided with the limiting hook at the position corresponding to the through hole and is embedded with the through hole, and the two fixed pins on the piston head are provided with two separate circular holes on the intake blocking segment. The two circular holes of the intake blocking segment are respectively positioned on the two fixed pins of the piston head, and at the same time, the T-shaped block of the piston head is abutted against the outer edge of the outer ring segment of the intake blocking segment, and the positioning convexity of the T-shaped block is clamped in the recessed clamping groove of the outer edge of the outer ring segment of the intake blocking segment, so that the intake blocking segment can be firmly positioned on the piston head.

Images