Low-noise air compressor having top-open piston with enhanced air-cooling performance

Abstract

The present invention relates to a low-noise air compressor having a top-open piston with enhanced air-cooling performance. In particular, the present invention relates to a novel technology for achieving low noise during operation of an air compressor while significantly improving compression efficiency, and self-cooling the interior of a crankcase of a compression pump and various compression components, such as a piston and a piston pin, without using oil for cooling and lubrication. Conventional air compressors have issues with reduced piston productivity, insufficient airflow, decreased compression efficiency, noise generation during operation, and deteriorated durability. To address these issues, the present invention is designed such that a plurality of intake holes are simultaneously formed in an upper region of the piston, excluding a cross-shaped valve fixing surface, via molding, an intake valve is directly fixed to the valve fixing surface using a valve fixing bolt, and when the intake valve approaches a lower surface of a valve seat, a head portion of the valve fixing bolt is inserted into an exhaust hole formed in the valve seat, thereby improving compression efficiency.

Description

Low-noise air compressor with top-open piston for excellent air cooling

[0001] The present invention relates to a novel technology that achieves low noise during the operation of an air compressor while significantly improving compression efficiency, as well as self-air cooling of the crankcase and various compression components (piston, piston pin, etc.) of a compression pump without using oil for cooling and lubrication.

[0002] Generally, in an air compressor, a crankshaft that rotates according to the operation of a motor is installed by penetrating the load side of the crankcase of a compression pump installed at the top of a receiver tank that stores compressed air, and a piston coupled to the top of a connecting rod coupled to the crankshaft is installed to be capable of reciprocating vertically inside a cylinder installed at the top of the crankcase.

[0003] Most of these air compressors are lubricated types, and due to a shortage of industrial manpower, most places do not have personnel dedicated to managing them. Furthermore, it is uncommon for the owners themselves to know how to properly maintain them, and even if they do, it is very rare for them to replenish or replace the lubricant according to the supply schedule. In particular, it is difficult to air-cool the inside of the crankcase and various compression components.

[0004] Accordingly, oil-free air compressors that do not use lubricating oil are emerging as an alternative. Unlike oil-lubricated compressors, these oil-free compressors are configured to draw in air from below the piston as the piston descends within the cylinder.

[0005] As a prior art document related to an oil-free air compressor that does not use lubricating oil, the present inventor's previously registered invention, "Patent Registration No. 2247444, Title / Oil-free air compressor having excellent air-cooling performance," is disclosed.

[0006] The aforementioned prior art document discloses a technology that prevents leakage of compressed air by closing the intake disc valve installed at the top of the piston when intake air introduced into the interior of the crankcase during the downward movement of the piston passes through the interior of the piston and reaches a plurality of intake holes penetrating the upper surface of the piston, thereby opening the intake disc valve and drawing the intake air into the compression chamber on the upper side of the piston, and then closing the intake disc valve when the upward movement of the piston begins.

[0007] However, the piston of the aforementioned prior art has the problem of a complex manufacturing process and low airflow because multiple intake holes are drilled individually by hand at the top for intake.

[0008] In addition, a fixing seat is used to fix the intake disc valve mounted on the top of the piston, and since a space corresponding to the thickness of this fixing seat must be secured in the upper part of the cylinder, the compression space is reduced, causing a problem of reduced overall compression efficiency.

[0009] Furthermore, due to the structure in which exhaust holes are formed on both sides of the valve seat, the piston fails to maintain straightness and oscillates left and right during the repeated process of reciprocating between the bottom dead center and top dead center within the cylinder due to resistance from the exhaust pressure distributed through the exhaust holes on both sides. Consequently, when reaching the top dead center where a heavy load is applied, the edges of the circular piston strike the inner wall of the cylinder, causing noise and inducing wear on the piston and the inner wall of the cylinder, which leads to a problem of reduced durability.

[0010] In addition, exhaust remains in a plurality of ring grooves formed on the upper and lower outer surfaces of the piston to reduce friction with the inner wall of the cylinder, and as such residual exhaust mixes with the intake air, the compression efficiency is reduced.

[0011] The present invention provides a technology to solve the above-mentioned problem by forming a plurality of intake holes at once in an area excluding a cross-shaped valve fixing surface on the top of a piston by molding using a mold, and by directly fixing an intake valve to the valve fixing surface using a valve fixing bolt.

[0012] In addition, the present invention provides a technology to improve compression efficiency by minimizing the space required to prevent contact between the piston's top dead center and the bottom surface of the valve seat through a special structure in which, when the intake valve approaches the bottom surface of the valve seat, the head of the valve fixing bolt is inserted into the exhaust hole formed in the valve seat.

[0013] In addition, the present invention provides a technology that allows the exhaust hole formed in the valve seat to be arranged in a straight line in the center, thereby preventing the piston from shifting when exhausting the exhaust pressure and maintaining straightness.

[0014] In addition, the present invention provides a technology that installs an exhaust blocking ring of an elastic member in the uppermost and lowermost ring grooves among the plurality of ring grooves formed on the outer surface of the piston, thereby maintaining a minimum tolerance between the cylinder and the outer surface of the piston and preventing exhaust from remaining in the plurality of ring grooves.

[0015] In addition, the present invention provides a technology that prevents excessive opening of the intake valve and maintains the degree of opening and closing optimally by installing a cross-shaped airtight sealing sheet on the top of the intake valve.

[0016] According to the present invention, a plurality of intake holes are directly formed at the top of the piston by molding using a mold, thereby eliminating the need to drill intake holes individually, which reduces manpower and time and significantly improves productivity. Additionally, by maximizing the intake holes, the airflow is increased, thereby providing the effect of improving compression efficiency.

[0017] In addition, the present invention provides the effect of improving overall compression efficiency by increasing the compression space of the cylinder while minimizing the space required to prevent contact between the piston's top dead center and the bottom surface of the valve seat, by directly fixing the intake valve to the top of the piston with a valve fixing bolt and, furthermore, inserting the head of the valve fixing bolt into the exhaust hole of the valve seat when the intake valve approaches the bottom surface of the valve seat.

[0018] In addition, the present invention provides the effect of improving durability by preventing wear on the piston and the inner wall of the cylinder by preventing the piston from shifting while maintaining straightness when exhausting the exhaust pressure, thereby fundamentally blocking noise caused by the corner of the circular piston hitting the inner wall of the cylinder.

[0019] In addition, the present invention provides the effect of preventing a decrease in compression efficiency by installing a compression ring and a guide ring, respectively, in ring grooves located at the uppermost and lowermost parts of the outer surface of the piston, thereby maintaining a minimum tolerance between the cylinder and the outer surface of the piston and preventing exhaust from remaining in a plurality of ring grooves.

[0020] In addition, the present invention implements an intake path in which intake air introduced into the interior of the crankcase sequentially passes through the interior of the piston, a plurality of expanded intake holes and an intake valve, and is sucked into an expanded compression space on the upper side of the piston, thereby enabling the piston to be compressed using the intake air during this process, and thus provides the effect of preventing the piston from overheating and maximizing the air cooling effect, even though it is an oil-free air compressor.

[0021] FIG. 1 is a side cross-sectional view of an air compressor to which the present invention is applied.

[0022] FIG. 2 is a perspective view of the piston of the present invention.

[0023] FIG. 3 is a plan view of the piston of the present invention.

[0024] FIG. 4 is the cross-sectional view along line AA and line BB of FIG. 3

[0025] FIG. 5 is a perspective view of an intake valve according to the present invention.

[0026] FIG. 6 is a perspective view of the airtight sheet of the present invention.

[0027] FIG. 7 is a plan view of a piston equipped with an intake valve and a sealing seat according to the present invention.

[0028] FIG. 8 is a cross-sectional view of the intake valve in an open state when the piston descends according to the present invention.

[0029] FIG. 9 is a side cross-sectional view of the piston lowering state of the present invention.

[0030] FIG. 10 is a cross-sectional view of the exhaust state through the exhaust hole when the piston rises according to the present invention.

[0031] FIG. 11 is a side cross-sectional view of the piston of the present invention in a state close to the valve seat.

[0032] FIG. 12 is a top view and a bottom view of a valve seat according to the present invention.

[0033] FIG. 13 is a side cross-sectional view of a valve seat according to the present invention.

[0034] FIG. 14 is a plan view of the valve seat of the present invention with an exhaust valve installed therein.

[0035] FIG. 15 is a plan view and a bottom view of a cylinder head according to the present invention.

[0036] FIG. 16 is a front cross-sectional view and a side view of a cylinder head according to the present invention.

[0037] FIG. 17 is a plan view of a piston equipped with an intake valve and a sealing seat according to another embodiment of the present invention.

[0038] FIG. 18 is a side cross-sectional view of a piston equipped with an intake valve and a sealing seat according to another embodiment of the present invention.

[0039] FIG. 19 is a plan view of a valve seat with an exhaust valve installed thereon according to another embodiment of the present invention.

[0040] FIG. 20 is a plan view of a pair of exhaust valves according to another embodiment of the present invention.

[0041] FIG. 21 is a plan view and a cross-sectional view of a compression ring according to the present invention.

[0042] FIG. 22 is a plan view of a piston according to another embodiment of the present invention.

[0043] FIG. 23 is a plan view of a piston equipped with an intake valve and a sealing seat according to another embodiment of the present invention.

[0044] FIG. 24 is a side cross-sectional view of a piston equipped with an intake valve and a sealing seat according to another embodiment of the present invention.

[0045] FIG. 25 is a cross-sectional view of a piston equipped with an intake valve and a sealing seat according to another embodiment of the present invention.

[0046] We will now describe a preferred embodiment for more specifically implementing the means for solving the problem that the present invention aims to solve.

[0047] Looking schematically at the overall configuration according to a preferred embodiment of the present invention with reference to the attached drawings, a crankshaft (3) that rotates according to the operation of a motor is installed through the load side of the crank chamber (2) of a compression pump (1), and a piston (10) coupled to the upper end of a connecting rod (4) coupled to the crankshaft (3) is installed inside a cylinder (5) so as to be able to move up and down reciprocally.

[0048] The above piston (10) has intake holes (12) formed on both sides of a valve fixing surface (11) formed at the top center, and an intake valve (20) is directly fixedly installed by passing through the valve fixing surface (11) with a valve fixing bolt (21), and the key point is that through this organic combination configuration, the performance of a lubrication-free air compressor with excellent air cooling is enabled.

[0049] Hereinafter, the present invention, composed of the above-mentioned general configuration, will be described in more detail to facilitate implementation.

[0050] That is, the piston (10) of the present invention is configured with an open top, and unlike conventional methods of manufacturing through machining, intake holes (12) are formed on both sides of a straight valve fixing surface (11) formed in the center by a molding method, thereby eliminating the need to drill intake holes (12) individually, which reduces manpower and time and provides the effect of improving productivity.

[0051] Here, an intake air dispersion surface (13) is formed at the center of both ends of the valve fixing surface (11), and intake holes (12) are formed on both sides with the intake air dispersion surface (13) in between. In this invention, intake air is evenly dispersed through the four intake holes (12) and flows into the compression space (5a) of the cylinder (5), and the airflow can be increased.

[0052] And as shown in FIGS. 7 and 8, a pair of valve fixing bolts (21) are screwed into the valve fixing surface (11) by passing through the intake valve (20) while the intake valve (20) is seated on the valve fixing surface (11), so that the intake valve (20) is directly fixedly installed on the top of the piston (10) without using separate components and smoothly performs the function of controlling the opening and closing of the intake hole (12).

[0053] Accordingly, by securing a compression space (5a) at the top of the cylinder (5) that corresponds to the thickness of the fixing seat used to fix the intake valve (20) in the prior art, the effect of improving overall compression efficiency is provided.

[0054] According to the operation of the upper open piston (10) of the present invention, when the piston (10) descends, intake air is introduced into the interior of the crankcase (2) through a plurality of intake ports (7) radially formed in a bearing case (6) installed on the half-load side of the crankcase (2) of the compression pump (1) as shown in FIG. 1. When this intake air passes through the interior from the lower part of the piston (10) and reaches a plurality of intake holes (12) as shown in FIG. 8, the intake valve (20) opens and the intake air is sucked into the compression space (5a) above the piston (10). Then, when the piston (10) begins to rise, the intake valve (20) automatically closes, preventing the compressed air within the compression space (5a) from leaking out.

[0055] Therefore, the present invention provides a special effect of reliably implementing a lubrication-free air compressor by preventing overheating of the piston (10) through air cooling of the inside of the crankcase (2), as well as the crankshaft (3), connecting rod (4), and piston (10), using intake air during the intake process by the upper open piston (10).

[0056] In addition, the present invention organically incorporates the technology of a sealing sheet (30) that can fix the intake valve (20) more securely and stably, and prevent excessive opening to maintain airtightness.

[0057] The airtight sealing sheet (30) for this purpose is configured in a cross shape, and when seated on the top of the intake valve (20), the valve fixing bolt (21) simultaneously penetrates the airtight sealing sheet (30) and the intake valve (20) and is screwed onto the valve fixing surface (11), thereby pressing both sides of the intake valve (20) to maintain appropriate tension and prevent excessive opening of the intake valve (20), thereby providing excellent airtightness to block leakage and also providing the effect of maintaining an appropriate degree of opening and closing.

[0058] Meanwhile, a valve seat (40) for installing an exhaust valve (50) is installed on the upper part of the cylinder (5) of the present invention, and the valve seat (40) has a plurality of exhaust holes (41) formed vertically through at intervals in the same direction as the valve fixing surface (11) of the piston (10).

[0059] The exhaust hole (41) basically serves as an air passage that allows compressed air compressed within the compression space (5a) to be exhausted to the cylinder head (60). In addition, as shown in FIG. 11, when the piston (10) rises during the exhaust process and the intake valve (20) approaches the lower surface of the valve seat (40), the head portion (21a) of the valve fixing bolt (21) is inserted into the exhaust holes (41) on both sides among the multiple exhaust holes (41), thereby the exhaust hole (41) performs a special function as an avoidance space where the fixing bolt can be avoided without colliding.

[0060] Therefore, the space for preventing contact between the upper limit of the piston (10) and the lower surface of the valve seat (40) can be minimized, thereby expanding the compression space (5a) of the cylinder (5) and significantly improving the overall compression efficiency, as well as providing the effect of preventing damage and noise caused by collision between the valve fixing bolt (21) and the valve seat (40).

[0061] In addition, the present invention incorporates a novel technology that prevents the piston (10) from shifting while maintaining straightness when exhausting the exhaust pressure caused by the rise of the piston (10).

[0062] As a technical configuration for this purpose, the plurality of exhaust holes (41) have a differentiated structure in which they are arranged in a straight line at a distance in the center, maintaining an orthogonal state with the piston pin (8) for connecting the piston (10) and the connecting rod (4) as well as in the same direction as the valve fixing surface (11).

[0063] Therefore, the exhaust pressure is not dispersed to both sides but is smoothly exhausted through the central exhaust hole (41), thereby preventing the piston (10) from shifting left and right during exhaust pressure and maintaining straightness, thus fundamentally blocking the noise generated when the corner of the circular piston (10) hits the inner wall of the cylinder (5), thereby achieving low noise, and thereby preventing wear on the piston (10) and the inner wall of the cylinder (5), and improving durability.

[0064] The piston (10) of the present invention has a plurality of ring grooves (14) formed on its outer surface to reduce frictional resistance with the inner wall of the cylinder (5) and to reduce weight. A technology is incorporated to actively resolve the issue of reduced compression efficiency caused by the exhaust remaining in these ring grooves (14) mixing with the intake air.

[0065] As a technical configuration for this purpose, as shown in FIG. 9, among the plurality of ring grooves (14) formed on the outer surface of the piston (10), a compression ring (70) having elasticity and a guide ring (70a) that assists in the safe reciprocating motion of the piston (10) are fitted and installed in the uppermost and lowermost ring grooves (14), respectively, and the compression ring (70) and the guide ring (70a) can reliably block exhaust from flowing into and remaining in the middle ring groove (14).

[0066] Here, as shown in FIGS. 9 and 21, the compression ring (70) and guide ring (70a) have a protective rim (71) formed protruding along the upper and lower circumferences to surround the outer diameter around the corner of the piston (10), thereby blocking the corner of the piston (10) from directly colliding with the inner wall of the cylinder (5) and providing the effect of preventing noise generation. In particular, the compression ring (70) and guide ring (70a) have a cut section formed at a certain point so that they can be spread open and fitted into the ring groove (14). At this time, the cut section of the compression ring (70) located at the top forms an interlocking uneven section (72) when viewed from a plane. As compressed air is supplied toward the compression ring (70) through the compressed air hole (15) formed to communicate with the ring groove (14) at the top of the piston (10), the uneven section (72) is pressed toward the inner wall of the cylinder (5), thereby compressing the uneven section (72) and preventing leakage of compressed air while improving compression efficiency. It provides an enhancing effect.

[0067] Meanwhile, in the air compressor of the present invention, the cylinder head (60) is integrally assembled with the cylinder (5) together with the valve seat (40) so that the compressed air can be finally exhausted.

[0068] That is, the upper part of the cylinder (5) is sequentially seated with a valve seat (40) and a cylinder head (60), and is assembled integrally with the cylinder (5) by passing through with a plurality of fixing bolts, and an exhaust valve (50) that controls the opening and closing of a plurality of exhaust holes (41) is installed on the upper surface of the valve seat (40) as shown in FIG. 14.

[0069] In addition, a plurality of valve stoppers (64) are formed protrudingly in the exhaust passage (63) that is recessed in the bottom surface adjacent to the exhaust chamber (61) to prevent excessive opening of the exhaust valve (50), thereby providing the effect of preventing bending of the exhaust valve (50).

[0070] Accordingly, when the piston (10) rises, the compressed air passing through the exhaust hole (41) and the temporarily opened exhaust valve (50) is gathered together in the exhaust chamber (61) formed in the cylinder head (60) and smoothly exhausted through the exhaust port (62) formed on one side of the cylinder head (60) to communicate with the exhaust chamber (61), and compressed air can be produced by forming an air circuit that is stored in the receiver tank via an exhaust pipe connected between the exhaust port (62) and the receiver tank.

[0071] The intake valve (20a) and the sealing sheet (30a) fixed to the piston (10) of the present invention may also be implemented in the form of other embodiments as shown in FIGS. 17 and 18. In a state where the intake valve (20a) and the sealing sheet (30a) are seated in a continuous stacked manner on the valve fixing surface (11), a plurality of valve fixing bolts (21) penetrate the valve fixing surface (11), the intake valve (20a), and the sealing sheet (30a) all at once from the lower side of the valve fixing surface (11), and a washer (22) is fitted and then a nut (23) is screwed in. During this process, the head portion (21a) of the valve fixing bolt (21) is inserted into the head portion insertion groove (16) formed in the bottom surface of the valve fixing surface (11), thereby preventing loosening under any circumstances, and the intake valve (20a) and the sealing sheet (30a) maintain a firm fixing force. During the exhaust process When the piston (10) rises and the intake valve (20a) approaches the lower surface of the valve seat (40), nuts (23) are inserted into the multiple exhaust holes (41) to prevent interference.

[0072] In addition, the valve seat (40a) and exhaust valves (50a) (50b) of the present invention can be implemented in a form capable of simultaneously opening and closing multiple exhaust holes (41), as shown in FIGS. 19 and 20. A pair of exhaust valves (50a) (50b) are fixedly installed by penetrating each upper side of the valve seat (40a) with valve fixing bolts (21). Since the number of valve plates (52) equal to the number of exhaust holes (41) protrudes in a fork shape, the exhaust valves (50a) (50b) can simultaneously open and close multiple exhaust holes (41), thereby simplifying the structure, reducing parts, and lowering costs. Furthermore, since the valve plates (52) of the pair of exhaust valves (50a) (50b) overlap each other, the exhaust valve (50b) on one side presses the valve plate (52) of the other exhaust valve (50a) to maintain appropriate tension while exhausting. It provides excellent airtightness that prevents leakage by preventing excessive opening of the valve (50a), as well as the effect of maintaining an appropriate degree of opening and closing.

[0073] Meanwhile, the upper open piston (100) of the present invention can further compact the piston (100) through the differentiated position and technical configuration of the intake hole (102) formed on the upper side, thereby enabling the implementation of a compact air compressor with a compression pump (1).

[0074] A piston (100) of another embodiment of the present invention for this purpose is configured such that, as shown in FIGS. 22 to 25, an intake hole (102) is formed in the front-rear direction between the valve fixing surfaces (101) formed on both upper sides of the piston (100), that is, at the upper center, as a method to reduce the overall height of the piston (100) and thus make it smaller by reducing the distance (L) from the center point of the boss (103) formed on both inner sides of the piston (100).

[0075] The reason the intake hole (102) is formed in the center is that when the large end (4a) of the connecting rod (4), which is fitted and coupled to the outside of the piston pin (8) installed through the bosses (103) on both sides of the piston (100), rotates, a certain avoidance space must be secured so that it does not interfere with the operation while contacting the top of the piston (100), so the size of the piston (100) must inevitably be larger.

[0076] However, the piston (100) of the present invention is positioned so that the large end (4) of the connecting rod (4) is partially inserted into the intake hole (102) formed in the center, thereby allowing the height of the piston (100) to be lowered without securing a separate avoidance space, so that the piston (100) can be made compact and the air compressor can be made smaller while providing the effect of an open top type.

[0077] Here, the intake hole (102) is configured as a rectangular shape formed long in the front-rear direction so that smooth intake is achieved even though the large end (4) is located in the center of the intake hole (102), thereby enabling smooth intake without restriction, and the lower inner corners facing each other on both sides of the intake hole (102) are formed as curved surfaces (102a) so that they can be positioned deeply up to the upper part of the intake hole (102) without the large end (4) coming into contact, thereby allowing the height of the piston (100) to be further lowered.

[0078] In the valve fixing surface (101) of the miniaturized piston (100) of the present invention, the intake valve (20b) and the sealing sheet (30b) are seated in a continuous stacked manner, and a plurality of valve fixing bolts (21) penetrate the valve fixing surface (101), the intake valve (20b), and the sealing sheet (30b) all at once from the lower side of the valve fixing surface (101), and a washer (22) is fitted and then a nut (23) is screwed in. In this process, the head portion (21a) of the valve fixing bolt (21) is inserted into the head portion insertion groove (106) formed in the bottom surface of the valve fixing surface (101), thereby preventing loosening under any circumstances, so that the intake valve (20b) and the sealing sheet (30b) maintain a firm fixing force. When the piston (10) rises during the exhaust process and the intake valve (20b) approaches the bottom surface of the valve seat (40), a plurality A nut (23) is inserted into the exhaust hole (41) to prevent interference.

[0079] In addition, a reinforcing rib (107) is formed protruding from the upper and lower sides of the boss (103) formed on both inner sides of the piston (100), and the reinforcing rib (107) located on the upper side among these reinforcing ribs (107) performs the role of a valve seat that supports the intake valve (20b) so that it does not sag downwards as well as reinforcing strength, thereby providing the effect of preventing bending or sagging of the intake valve (20b), and as compressed air is supplied toward the compression ring (70) through the compressed air hole (105) formed to communicate with the ring groove (104) at the top of the piston (100), the uneven part (72) is pressed toward the inner wall of the cylinder (5), thereby compressing the uneven part (72), thereby providing the effect of preventing leakage of compressed air and improving compression efficiency.

Claims

1. In an air compressor in which a crankshaft (3) is installed to rotate according to the operation of a motor by penetrating the load side of the crank chamber (2) of a compression pump (1), and a piston (10) connected to the upper end of a connecting rod (4) connected to the crankshaft (3) is installed to be capable of reciprocating vertically inside a cylinder (5), The above piston (10) has intake holes (12) formed on both sides of a valve fixing surface (11) formed at the top center, and an intake valve (20) is directly fixedly installed by passing through the valve fixing surface (11) with a valve fixing bolt (21); A low-noise air compressor having an open-top piston with excellent air cooling performance, characterized in that, among the multiple exhaust holes (41) formed in the valve seat (40) installed at the top of the cylinder (5), the head portion (21a) of the valve fixing bolt (21) is inserted into the exhaust holes (41) on both sides when the intake valve (20) approaches the bottom surface of the valve seat (40), and the exhaust holes (41) function as a fixing bolt avoidance space.

2. In Paragraph 1, A low-noise air compressor having an open-top piston with excellent air cooling performance, characterized in that an intake dispersion surface (13) is formed at the center of both ends of the valve fixing surface (11), and intake holes (12) are formed on both sides with the intake dispersion surface (13) in between.

3. In Paragraph 1, A low-noise air compressor having an upper open-type piston with excellent air cooling performance, characterized in that when the piston (10) descends, intake air introduced into the interior of the crankcase (2) through a plurality of intake ports (7) radially formed in a bearing case (6) installed on the half-load side of the crankcase (2) passes through the interior of the piston (10) and reaches a plurality of intake holes (12), at which point the intake valve (20) opens and the intake air is sucked into the compression space (5a) above the piston (10), and then when the piston (10) begins to rise, the intake valve (20) closes to prevent leakage of compressed air.

4. In Paragraph 1, A low-noise air compressor having an open-top piston with excellent air cooling, characterized in that the exhaust hole (41) is positioned at an orthogonal angle to the piston pin (8) and is spaced in a straight line in the center.

5. In Paragraph 1, A low-noise air compressor having an open-top piston with excellent air cooling performance, characterized in that a compression ring (70) and a guide ring (70a) of an elastic member are fitted into the uppermost and lowermost ring grooves (14) respectively among the plurality of ring grooves (14) formed on the outer surface of the piston (10).

6. In Paragraph 1, A low-noise air compressor having an open-top piston with excellent air cooling performance, characterized in that a cross-shaped sealing seat (30) is additionally seated on the top of the intake valve (20), and a valve fixing bolt (21) penetrates the sealing seat (30) and the intake valve (20) and is screw-coupled to the valve fixing surface (11).

7. In Paragraph 1, A low-noise air compressor having an open-top piston with excellent air cooling performance, characterized in that a valve seat (40) and a cylinder head (60) are sequentially seated on the top of the cylinder (5), and are assembled integrally with the cylinder (5) by penetrating with a plurality of fixing bolts, and an exhaust valve (50) that controls the opening and closing of a plurality of exhaust holes (41) is installed on the upper surface of the valve seat (40), and when the piston (10) rises, compressed air passing through the exhaust holes (41) and the exhaust valve (50) that opens is collected together in the exhaust chamber (61) of the cylinder head (60) and exhausted through an exhaust port (62) on one side.

8. In an air compressor in which a crankshaft (3) is installed to rotate according to the operation of a motor by penetrating the load side of the crank chamber (2) of a compression pump (1), and a piston (10) connected to the upper end of a connecting rod (4) connected to the crankshaft (3) is installed to be capable of reciprocating vertically inside a cylinder (5), The above piston (10) has intake holes (12) formed on both sides of a valve fixing surface (11) formed at the top center, and an intake valve (20) is directly fixedly installed by passing through the valve fixing surface (11) with a valve fixing bolt (21); A low-noise air compressor having an open-top piston with excellent air cooling performance, wherein a pair of exhaust valves (50a) and (50b) are fixedly installed by passing through each side of the upper portion of a valve seat (40a) that is seated on the upper portion of the cylinder (5), with the same number of valve plates (52) as the exhaust holes (41) formed protruding therefrom, using valve fixing bolts (21), and the pair of exhaust valves (50a) and (50b) have valve plates (52) that overlap each other.

9. In an air compressor in which a crankshaft (3) is installed to rotate according to the operation of a motor by penetrating the load side of the crank chamber (2) of a compression pump (1), and a piston (10) connected to the upper end of a connecting rod (4) connected to the crankshaft (3) is installed to be capable of reciprocating vertically inside a cylinder (5), The above piston (10) has intake holes (12) formed on both sides of a valve fixing surface (11) formed at the upper center, and an intake valve (20a) and a sealing seat (30a) are continuously seated on the valve fixing surface (11), and a plurality of valve fixing bolts (21) penetrate the valve fixing surface (11), intake valve (20a), and sealing seat (30a) all at once from the lower side of the valve fixing surface (11), and a washer (22) is fitted, and a nut (23) is screwed in, and the head portion (21a) of the valve fixing bolt (21) is inserted into a head portion insertion groove (16) formed in a depression on the bottom surface of the valve fixing surface (11), while during the exhaust process, when the piston (10) rises and the intake valve (20a) approaches the lower surface of the valve seat (40), a nut (23) is inserted into a plurality of exhaust holes (41), characterized by having excellent air-cooling properties. Low-noise air compressor.

10. In an air compressor in which a crankshaft (3) is installed to rotate according to the operation of a motor by penetrating the load side of the crank chamber (2) of a compression pump (1), and a piston (100) connected to the upper end of a connecting rod (4) connected to the crankshaft (3) is installed to be capable of reciprocating vertically inside a cylinder (5), The above piston (100) has an intake hole (102) formed in the center between the valve fixing surfaces (101) formed on both upper sides, and an intake valve (20b) and a sealing seat (30b) are continuously seated on the valve fixing surfaces (101), and a plurality of valve fixing bolts (21) penetrate the valve fixing surfaces (101), intake valve (20b), and sealing seat (30b) all at once from the lower side of the valve fixing surfaces (101), and a washer (22) is fitted, and a nut (23) is screwed in, and the head portion (21a) of the valve fixing bolt (21) is inserted into a head portion insertion groove (106) formed in a recess on the bottom surface of the valve fixing surfaces (101), characterized by a low-noise air compressor having an upper open-type piston with excellent air cooling performance.

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