Piston for air compressor cylinder

Abstract

The invention provides a piston of an air compressor cylinder, which is provided with an air inlet blocking piece at the piston head, the air inlet blocking piece is provided with a first bending section, and one side of the first bending section is provided with a side piece corresponding to the action area of the air inlet channel of the piston, and the other side of the first bending section is a positioning area, the side piece and the top end plane of the piston head form a small angle opening, so as to form an air passage space, the piston rod extended below the piston head axis is provided with a cavity, the bottom end vertical column sleeve is provided with a spring, the other end of the spring protrudes upwards along the air passage of the piston head and is slightly lifted on the air inlet blocking piece, so that the air inlet channel of the piston head is connected with the air passage space, and the action area of the air inlet blocking piece is still open when the piston is in the static stage.

Description

TECHNICAL FIELD

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

[0002] The main structure of an air compressor is to drive a piston in a cylinder by a motor to perform a reciprocating compression action. The compressed air can be delivered from the cylinder to a gas storage seat, and then connected to an article to be inflated by a transmission hose connected to a manifold on the gas storage seat. The piston head of a conventional piston is provided with an air passage that is penetrated by an air inlet shutter. In the state of shutdown of the air compressor, the air inlet shutter closes the air passage of the piston head. After the air compressor is started again, the air-tightness formed by the air-tight ring provided on the circular periphery of the piston head and the air inlet shutter closing the air passage of the piston head makes it impossible to discharge the high-pressure air remaining in the cylinder. When the piston starts to compress, it collides with the high-pressure air remaining in the cylinder, which instantaneously increases the load and current of the air compressor, resulting in a reduction in the service life of the air compressor. SUMMARY

[0003] The main purpose of the present application is to provide a piston for an air compressor cylinder, in particular, the piston installed in the air compressor is provided with an air inlet blocking piece on the piston head, the air inlet blocking piece is mechanically formed with a first bending section on the body, the right side of the first bending section is a positioning area, and the left side of the first bending section is an action area, the action area is hollowed out with a non-full circular annular inner space in the inner wall, so as to divide the action area into an outer ring section and an inner circle section, the outer ring section and the inner circle section are connected to form a neck section, the neck section is mechanically formed with a second bending section, so that the inner circle section is slightly raised, that is, the inner circle section and the outer ring section form a large obtuse angle less than 180 degrees with the second bending section as the axis, and the lower surface of the inner circle section forms a small angle θ2 acute angle with the upper surface of the outer ring section, the piston rod extended below the piston head shaft is provided with a cavity, the bottom end of the columnar sleeve is provided with a spring, the other end of the spring protrudes upward along the air passage penetrating the piston head and abuts against the slightly raised air inlet blocking piece, so that the air inlet blocking piece of the piston of the air compressor is kept open relative to the air passage in the stationary state, the air passage of the piston is smooth, the pressure in the cylinder is balanced with the surrounding atmosphere, and the piston does not have additional resistance (back pressure resistance) when starting again, so that the piston can maintain smooth compression efficiency when reciprocating in the cylinder, and has the advantages of safety, long service life, and easy and fast inflation of the air.

[0004] Another main purpose of the present application is to provide a piston for an air compressor cylinder, the piston is provided with an air inlet blocking piece, the air inlet blocking piece is provided with a circular hole in the positioning area, the piston head top end plane corresponding to the circular hole is provided with a fixed pin, the air inlet blocking piece is provided with a through hole in the outer ring section of the action area, the piston head is provided with a limiting hook corresponding to the through hole and embedded with the through hole, the limiting hook can adjust the height of the air inlet blocking piece according to the size of the air compressor output power, the inner circle section of the action area of the air inlet blocking piece is attached to the top end plane of the piston head in the upstroke of the piston, so that the air inlet blocking piece closes the air passage; in the downstroke of the piston, the air inlet blocking piece tends to open wider under the thrust of the external air, but is limited by the limiting hook, so as to avoid the phenomenon that the air inlet blocking piece is easily damaged due to unlimited opening; in the stationary state of the piston, the action area of the air inlet blocking piece and the top end plane of the piston head are kept open, and the through hole of the air inlet blocking piece is stopped by the limiting hook.

[0005] Yet another main object of the present application is to provide a piston of an air compressor cylinder, wherein the piston moving in the cylinder is provided with an air inlet blocking piece, a first bending section is formed on the blocking piece between a positioning area and an acting area of the blocking piece by mechanical processing, the first bending section has a plurality of bending tracks, i.e. a first bending track and a second bending track, so that the up and down stroke of the air compressor with large power can be more smoothly performed, and in the static state, the acting area of the air inlet blocking piece and the top end plane of the piston head keep open state, and the through hole of the air inlet blocking piece stops at the limiting hook.

[0006] Yet another main object of the present application is to provide a piston of an air compressor cylinder, wherein the piston moving in the cylinder comprises a piston head and a piston rod extending below the axis of the piston head, the piston rod is provided with a cavity penetrating through the left and right sides of the piston rod and connected with the air inlet channel of the piston head, and a spring is sleeved on the columnar top end of the cavity bottom end surface of the piston rod and penetrates through the air inlet channel of the piston head along the cavity of the piston rod.

[0007] After the above technical scheme is adopted, in the state of the air compressor stopping, a small angle air passage space is formed between the top end surface of the piston head and the air inlet blocking piece, when the air compressor is finished, the compressed air remaining in the cylinder can be discharged through the air passage space, so that the pressure in the cylinder is balanced with the surrounding atmosphere, when the air compressor is started again, the piston in the up stroke will not have extra resistance, the instantaneous increase of the compression load and the current surge are avoided, the piston can maintain smooth compression efficiency when reciprocating in the cylinder, the use safety and the service life are prolonged, and the air charging object can be easily and quickly charged with air. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a perspective exploded view of the piston of the present application;

[0009] Figure 2 is a perspective view of the piston of the present application;

[0010] Figure 3 is a partial enlarged sectional view of the piston of the present application;

[0011] Figure 4 is a top view of the air inlet blocking piece of the present application;

[0012] Figure 5 is a schematic view of the air compressor of the present application provided in a box body;

[0013] Figure 6 is a schematic view of the compressed air flow of the piston of the present application in the down stroke;

[0014] Figure 7 is a schematic view of the piston upper stroke action of the present application.

[0015] Explanation of symbols:

[0016] 1... box body

[0017] 10... air compressor

[0018] 11... base plate

[0019] 12... motor

[0020] 13... cylinder

[0021] 14... transmission mechanism

[0022] 141... crankshaft

[0023] 15... air reservoir

[0024] 16... pressure display meter

[0025] 20... limit stopper

[0026] 21... piston head

[0027] 211... fixed pin

[0028] 212... fixed pin

[0029] 213... vertical column

[0030] 214... horizontal column

[0031] 23... air inlet passage

[0032] 24... air-tight ring

[0033] 5... piston rod

[0034] 50... cavity

[0035] 51... circular hole

[0036] 52... air passage

[0037] 53... column tip

[0038] 54... spring

[0039] 7... air inlet baffle

[0040] 71... first bending section

[0041] 711... first bending track

[0042] 712...second bending trajectory

[0043] 72...positioning area

[0044] 721...circular hole

[0045] 722...circular hole

[0046] 73...action area

[0047] 731...through hole

[0048] 732...outer ring segment

[0049] 733...inner circle segment

[0050] 734...neck segment

[0051] 74...annular inner space

[0052] 75...second bending segment

[0053] 751...first bending trajectory

[0054] Z...ventilation space

[0055] θ1...angle

[0056] θ2...angle DETAILED DESCRIPTION

[0057] Please refer to Figure 5 the air compressor 10 device shown in the figure, the air compressor 10 can be arranged in the cabin, the box 1 or its working place, such as Figure 5 the box 1 shown in the figure is provided with the air compressor 10 device, which can be used for air charging or combined with a rubber supplement device (not shown in the prior art figure) to supplement the rubber charging effect. The air compressor 10 comprises a base plate 11 for fixing a motor 12, a cylinder 13 combined with the base plate 11, and the base plate 11 can be provided with a transmission mechanism 14 of the air compressor 10, and the transmission mechanism 14 is connected with a piston. Please refer to Figures 1 to 4The piston comprises a piston head 21, a periphery of which is provided with a gas seal ring 24, which realizes a continuous seal around the piston and the inner surface of the cylinder 13 during operation of the air compressor 10. The piston head 21 is provided with an upper and lower air inlet passage 23. The piston head 21 extends downwardly to a piston rod 5, a lower end of which is provided with a circular hole 51 for being pivotally connected to the crankshaft 141 of the transmission mechanism 14. An upper end of the piston rod 5 is provided with a hollow 50 extending through the left and right sides of the piston rod 5 and forming an air passage 52. The hollow 50 is connected to the air inlet passage 23 of the piston head 21. A vertical post 53 is provided on a bottom end surface of the hollow 50, and a spring 54 is sleeved on the vertical post 53. The spring 54 extends through the air inlet passage 23 of the piston head 21 along the hollow 50 of the piston rod 5, and the other end of the spring 54 abuts against a back surface of an action area 73 of an air inlet baffle 7. The air inlet baffle 7 can also keep the action area 73 in an open state in which a back surface of the action area 73 is at a small angle θ1 with respect to a top end surface of the piston head 21 due to the force of the spring 54. The air passage 52 and the air inlet passage 23 can be connected to the atmosphere. When the output shaft of the motor 12 drives the crankshaft 141 of the transmission mechanism 14 to rotate, the piston in the cylinder 13 is driven to perform upstroke and downstroke movements, so that compressed air enters the air storage seat 15. The compressed air can enter the pressure display table 16 through the air delivery manifold, so as to display the pressure. The air can be delivered to the object to be inflated through the air delivery hose (not shown in the figure). The air can also be delivered to the damaged tire through the air delivery hose or the valve switch, so as to realize the tire repair function (not shown in the figure). However, the above-mentioned functions are currently implemented in the use state, and therefore, the details of the structure are not shown or described.

[0058] The piston in the cylinder of the air compressor 10 of the present application comprises a piston head 21 and a piston rod 5 connected to the piston head 21. The piston head 21 is provided with an air inlet baffle 7. The air inlet baffle 7 is mechanically formed with a first bending section 71 on its body. In the present specification, the first bending section 71 refers to the mechanical formation of the air inlet baffle 7 into a shape such as a toothed shape, an arch shape, an inverted U shape, a slope shape, a stepped section, etc. The first bending section 71 can have at least one bending track according to the resistance (designed according to the power of the air compressor) and its thickness. In other words, the first bending section 71 can have a plurality of bending tracks. In the present embodiment, the first bending section 71 has a first bending track 711 and a second bending track 712. The right side of the first bending section 71 is a positioning area 72, and the left side of the first bending section 71 is an action area 73. The action area 73 is internally hollowed out with a non-full-circle annular inner space 74, which divides the action area 73 into an outer ring section 732 and an inner circle section 733. The outer ring section 732 and the inner circle section 733 form a neck section 734 at the connection therebetween. The neck section 734 is mechanically formed with a second bending section 75, which slightly raises the inner circle section 733. In other words, the inner circle section 733 and the outer ring section 732 form a large obtuse angle of less than 180 degrees with the first bending track 751 in the second bending section 75 as the axis. In another angle, the lower surface of the inner circle section 733 and the upper surface of the outer ring section 732 form an acute angle θ2 at the junction of the first bending track 751 in the second bending section 75. When external pressure acts on the air inlet baffle 7, the stress of the air inlet baffle 7 is opened and closed up and down along the first bending track 711, the second bending track 712, and the first bending track 751 (or track) of the second bending section 75 provided by the first bending section 71. The positioning area 72 on one side of the second bending track 712 is provided on the aforementioned piston head 21, i.e., the piston head 21 is provided with two separate fixing pins, and the positioning area 72 of the air inlet baffle 7 is provided with separate round holes 721, 722 with respect to the fixing pins on the piston head 21. The round holes 721, 722 of the air inlet baffle 7 are positioned on the fixing pins of the piston head 21, respectively, so that the air inlet baffle 7 can be firmly positioned on the piston head 21. The other side of the first bending section 71 is the action area 73, which is divided into the outer ring section 732 and the inner circle section 733. The outer ring section 732 and the inner circle section 733 form the neck section 734 at the connection therebetween. The neck section 734 is mechanically formed with the second bending section 75, which has the first bending track 751, so that the inner circle section 733 is slightly raised by the angle θ2.The piston of the cylinder 13 of the present application comprises a piston head 21 and a piston rod 5 extending downward from the axis of the piston head 21, the piston rod 5 is provided with a through hole 50 extending through the left and right sides of the piston rod 5 and connected to the air passage 52 of the cylinder 13, the through hole 50 is connected to the air inlet passage 23 of the piston head 21, and the bottom end surface of the through hole 50 is provided with a vertical columnar protrusion 53, and a spring 54 is sleeved on the columnar protrusion 53, the spring 54 extends through the through hole 50 of the piston rod 5 and penetrates the air inlet passage 23 of the piston head 21.

[0059] When the piston is in the upward stroke, the inner circular segment 733 of the action area 73 of the air inlet blocking piece 7 can close the air inlet passage 23. The first bending section 71 is used as the boundary axis between the action area 73 of the air inlet blocking piece 7 and the positioning area 72 of the air inlet blocking piece 7, so that the positive surface of the air inlet blocking piece 7 (i.e. the surface of the air inlet blocking piece 7 facing upward during the upward stroke) forms an obtuse angle less than 180 degrees, and the air inlet blocking piece 7 can also be kept in an open state with a small angle θ1 between the back surface of the action area 73 of the air inlet blocking piece 7 and the top surface of the piston head 21 under the force of the spring 54, forming a ventilation space Z. When the piston of the air compressor 10 is in the stationary state, the inner circular segment 733 of the action area 73 of the air inlet blocking piece 7 is kept open relative to the air inlet passage 23 and the air passage 52. Because the spring 54 is arranged in the through hole 50 of the piston rod 5, the other end of the spring 54 also abuts against the back surface of the action area 73 of the air inlet blocking piece 7, so that the air inlet blocking piece 7 and the top surface of the piston head 21 form an open ventilation space Z. Based on the design of the first bending section 71 of the air inlet blocking piece 7 and the abutment of the spring 54 against the back surface of the action area 73 of the air inlet blocking piece 7, the air inlet blocking piece 7 can be kept in a smooth operation and protection state during the opening operation and the stationary state of the piston head 21, so as to avoid the occurrence of elastic fatigue. Because the air inlet passage 23 of the piston is smooth, the pressure in the cylinder 13 is balanced with the surrounding atmosphere, so that when the air compressor 10 is started again, the piston will not have additional resistance (back pressure resistance) during the upward stroke. Because of the buffering of the spring 54, the piston can maintain smooth compression efficiency during the reciprocating motion in the cylinder 13, and has the advantages of safety in use and prolonging the service life, and can more easily and quickly charge the gas to be filled. The outer ring segment 732 of the action area 73 of the air inlet blocking piece 7 is provided with a through hole 731, and the piston head 21 is provided with a limiting hook 20 corresponding to the position of the through hole 731 and embedded with the through hole 731. Please refer to Figure 6 and Figure 7 , the action diagram of the piston in the upward stroke and the downward stroke in the cylinder 13, in the upward stroke of the piston, as shown in Figure 7As shown, the aforementioned spring 54 will be compressed and the intake blocking plate 7 will be closed to the air passage 23, so that the intake blocking plate 7 closes the air passage 52; during the downstroke phase of the piston, the aforementioned spring 54 will be stretched and the intake blocking plate 7 will be opened to the air passage 23 as shown Figure 6 As shown, the intake blocking plate 7 will be opened to the air passage 23, so that the intake blocking plate 7 closes the air passage 52; during the downstroke phase of the piston, the aforementioned spring 54 will be stretched and the intake blocking plate 7 will be opened to the air passage 23 as shown Figure 6 As shown, the aforementioned spring 54 will be compressed and the intake blocking plate 7 will be closed to the air passage 23, so that the intake blocking plate 7 closes the air passage 52; during the downstroke phase of the piston, the aforementioned spring 54 will be stretched and the intake blocking plate 7 will be opened to the air passage 23 as shown

[0060] The technical features of the intake blocking plate 7 of the present application are that a first bending section 71 is provided on the blocking plate body to form a first bending track 711 and a second bending track 712, so that the plate body of the intake blocking plate 7 in the active area 73 and the top surface of the piston head 21 form an opening state with a small angle θ1, and on the other hand, the second bending section 75 makes the lower surface of the inner circular segment 733 and the upper surface of the outer ring segment 732 form an opening state with a small angle θ2 at the first bending track 751 in the second bending section 75. By the technical features of the angles θ1 and θ2, the air passage 23 of the piston is smooth, so that the pressure in the cylinder 13 is balanced with the surrounding atmosphere, and when the air compressor is started again, the piston in the upstroke will not have additional resistance (back pressure resistance), so that the piston can maintain smooth compression efficiency when reciprocating in the cylinder 13, and has the advantages of safety and prolonging the service life, and can more easily and quickly charge the air to the gas, and because the high-power output intake blocking plate 7 has the design of the first bending section 71 and the second bending section 75, the opening and closing motion of the intake blocking plate 7 is more smooth and can protect the entire intake blocking plate 7 from being damaged.

Claims

1. A piston for an air compressor cylinder, the air compressor having a piston which is drivable by a motor and which is reciprocable up and down within the cylinder, characterised in that: The air compressor is installed with a piston, and the piston head is installed with an air inlet blocking piece. A first bending section is formed on the body of the air inlet blocking piece by mechanical process. The air inlet blocking piece is divided into an action area and a positioning area by the first bending section as the boundary axis. The front surface of the air inlet blocking piece forms a blunt angle less than 180 degrees. The back surface of the action area of the air inlet blocking piece naturally forms an open state with the top end plane of the piston head with an included angle, and a ventilation space is formed. A non-full circular annular inner hollow area is formed in the inner body of the action area, which divides the action area into an outer ring segment and an inner circle segment. The outer ring segment and the inner circle segment form a neck section at the connecting position. A second bending section is formed on the neck section by mechanical process, so that the inner circle segment is slightly raised. That is, the inner circle segment and the outer ring segment form a blunt angle less than 180 degrees by the second bending section as the axis. The lower surface of the inner circle segment forms an acute angle with the upper surface of the outer ring segment at the second bending section. The piston head extends downward to form a piston rod. A hollow is formed on the upper end of the piston rod and extends through the left and right sides of the piston rod to form an air passage. The hollow is connected with the air inlet passage of the piston head. A vertical column is formed on the bottom end surface of the hollow. A spring is sleeved on the vertical column. The spring extends through the air inlet passage of the piston head along the hollow of the piston rod. The other end of the spring abuts against the back surface of the action area of the air inlet blocking piece. The air inlet blocking piece can also keep the action area in the open state with the top end plane of the piston head with an included angle by the force of the spring. The air passage and the air inlet passage can be connected with the atmosphere.

2. The piston of an air compressor cylinder of claim 1, wherein: The first bending section comprises at least one bending track, which comprises a first bending track and a second bending track. The right side of the first bending section of the air inlet blocking piece is the positioning area, and the left side of the first bending section is the action area.

3. The piston of an air compressor cylinder of claim 1, wherein: The piston head is provided with two separate fixed pins. The air inlet blocking piece is provided with separate round holes in the positioning area. The round holes of the air inlet blocking piece are positioned on the fixed pins of the piston head, so that the air inlet blocking piece is firmly positioned on the piston head. The air inlet blocking piece is provided with a through hole. The piston head is provided with a limiting hook at the position corresponding to the through hole. When the piston of the air compressor is in the stationary state, the action area of the air inlet blocking piece is in the open state with the air inlet passage of the piston head.

4. The piston of an air compressor cylinder of claim 3, wherein: The limiting hook of the piston head comprises a vertical column and a horizontal column. The vertical column provides the opening and closing path of the air inlet blocking piece. Therefore, the length of the vertical column and the design of the horizontal column can be adjusted according to the size of the power of the air compressor to adjust the initial height of the air inlet blocking piece.

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