KR20240012134A - Oilless air compressor and valve assembly using the same - Google Patents

Abstract

The valve assembly for an oil-less air compressor includes a valve that selectively opens and closes the intake and exhaust passages when external air is sucked in and compressed through the intake passage and then produced through the exhaust passage. In this case, the valve is composed of a main body with a coupling groove in the center, a wing part that is symmetrically connected to both sides of the main body, and is disposed on the intake and exhaust flow paths, and is inserted into and coupled to the coupling groove. A seating plate having a coupling protrusion is provided, and includes a cover plate that is coupled to the seating plate and seals it from the outside.

Description

Oilless air compressor and valve assembly using the same}

The following description relates to an oil-less air compressor and a valve assembly used therein.

An air compressor is a device that compresses air to produce high pneumatic pressure. Among them, an oilless air compressor refers to a reciprocating air compressor that does not require lubrication. Because there is no oil mixed in the air, there is no need for oil management, and it is highly portable, making it suitable for use while moving.

The air compressor sucks the surrounding air into the cylinder provided inside, and then compresses the air sucked into the cylinder through piston action. It can also be used as an inhaler because it sucks in the surrounding air, and uses the produced compressed air. By connecting it to air tools (e.g., air guns, spray guns, airbrushes, etc.), it can be used for various purposes such as industrial, medical, and household devices that use compressed air.

Figures 1 and 2 are presented for detailed explanation. Figure 1 is a cross-sectional view showing the air intake of an air compressor, and Figure 2 is a cross-sectional view showing the air discharge of the air compressor. The shaft 70, which is connected to a motor (not shown) and rotates, is inserted and coupled to the eccentric hole 11 formed in the eccentric body 10. The eccentric body 10 is connected to the connecting rod 30, and a bearing 20 is installed between it to rotatably couple the eccentric body 10 to the connecting rod 30. The piston 25 coupled to one end of the connecting rod 30 by the rotation of the eccentric body 10 reciprocates in the inner space 45 of the cylinder 40, and moves the inner space 45 of the cylinder 40. ) is formed with an intake passage 64 and an exhaust passage 63 communicating to the outside, and each of them is equipped with an intake valve 62 and an exhaust valve 61.

When the eccentric body 10 rotates and the piston 25 moves downward in the inner space 45 of the cylinder 40, the intake valve 62 opens the intake passage 64 and the exhaust valve 61 opens. When the exhaust passage 63 is closed, the internal space 45 expands and the pressure drops, causing external air to flow into the internal space 45 of the cylinder 40 through the suction passage 64. This operation can also be used as a vacuum pump to suck in external air. Next, the eccentric body 10 is rotated in a state in which the intake path 64 and the exhaust path 63 are closed using the intake valve 62 and the exhaust valve 61, so that the piston 25 moves into the cylinder 40. When advancing in the direction of reducing the internal space 45, the air sucked into the internal space 45 is compressed. After compression occurs for a certain period of time, when the exhaust valve 61 is opened, the compressed air is provided to the outside through the exhaust passage 63. A piston ring 50 is coupled to the outer peripheral surface of the piston 25 to prevent compressed air in the internal space 45 from leaking.

As explained earlier, the intake valve and exhaust valve must continuously move at the correct timing to open and close the intake and exhaust passages. If the parts are not properly combined in the correct position, not only will they not perform their function fully, but it may also cause noise and vacuum. and may cause a malfunction. In other words, an opening/closing sound occurs between the valve plate and the valve, and a lot of valve vibration occurs.

Only by inserting and assembling the valve into the correct position can it perform its proper function, as well as eliminating the causes of opening/closing noise, vibration, and malfunctions. Since the process of assembling the valve into the correct position is performed by a person, there is no room for error. may occur, and the valve 550 is not large in size, so assembling it in the correct position is not as easy as expected.

The purpose of the embodiment is to provide an oil-less air compressor that is easy to assemble and has no risk of defectiveness, and a valve assembly used therein.

The purpose of the embodiment is to provide an oil-less air compressor that controls vibration of the valve more effectively than before and improves convenience in the manufacturing process, and a valve assembly used therein.

The problems to be solved in the embodiments are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

According to embodiments for achieving the above-described problem, the oil-less air compressor is rotatable and includes a ring-shaped rotor with a plurality of magnets along the inner circumferential surface, provided inside the rotor, and allowing the rotor to rotate. A stator coil that provides electromagnetic force, a motor shaft that is connected to the rotor and rotates as one piece, a flywheel that is connected to one side of the motor shaft and provides rotational inertia, and a stator that is connected to the other side of the motor shaft and rotates, but is eccentric with respect to the center of rotation. The eccentric cam is rotatably connected through the eccentric cam and the main bearing, and the connecting rod is coupled with a piston on the other side. The piston reciprocates in the internal space, and is provided with an intake port and an exhaust port to allow outside air to flow into the inner space. It includes a cylinder formed to intake and exhaust, a valve assembly that selectively opens and closes an intake passage and an exhaust passage, and the valve assembly is formed by being symmetrically connected to both sides of the body and a main body with a coupling groove in the center, the It includes a valve consisting of a wing portion disposed on an intake passage and an exhaust passage, a seating plate on which the valve is mounted and having a coupling protrusion inserted into the coupling groove, and a cover plate coupled to the seating plate to seal it from the outside.

An O-ring is inserted and coupled around the valve to seal it, and the O-ring is preferably coupled to the oil mounting groove formed on the seating plate.

In addition, the valve assembly for an oilless air compressor according to the present invention is an oilless air compressor that includes a valve that selectively opens and closes the intake and exhaust passages when external air is sucked in and compressed through the intake passage and then produced through the exhaust passage. In the valve assembly for an air compressor, the valve is composed of a main body with a coupling groove in the center, a wing portion symmetrically connected to both sides of the main body, and disposed on the intake and exhaust passages, A seating plate is provided having a coupling protrusion that is inserted into the coupling groove, and includes a cover plate that is coupled to the seating plate and seals it from the outside.

According to the embodiments, not only is it easy to combine and there is no risk of defects, but it is also possible to control the vibration of the valve more effectively than before and promote convenience in the manufacturing process.

The effects according to the embodiment are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below.

Figure 1 is a cross-sectional view showing the air intake of an air compressor.
Figure 2 is a cross-sectional view showing air discharge from an air compressor.
Figure 3 is a cross-sectional perspective view of an oil-less air compressor according to an embodiment of the present invention.
Figure 4 is an exploded perspective view including the valve assembly.
Figure 5 is an enlarged exploded perspective view of the valve assembly.

Hereinafter, embodiments will be described in detail with reference to the attached drawings. However, various changes can be made to the embodiments, so the scope of the patent application is not limited or limited by these embodiments. It should be understood that all changes, equivalents, or substitutes for the embodiments are included in the scope of rights.

The terms used in the examples are for descriptive purposes only and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the embodiments belong. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

In addition, when describing with reference to the accompanying drawings, identical components will be assigned the same reference numerals regardless of the reference numerals, and overlapping descriptions thereof will be omitted. In describing the embodiments, if it is determined that detailed descriptions of related known technologies may unnecessarily obscure the gist of the embodiments, the detailed descriptions are omitted.

Additionally, in describing the components of the embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, or order of the component is not limited by the term. When a component is described as being "connected," "coupled," or "connected" to another component, that component may be directly connected or connected to that other component, but there is no need for another component between each component. It should be understood that may be “connected,” “combined,” or “connected.”

Components included in one embodiment and components including common functions will be described using the same names in other embodiments. Unless stated to the contrary, the description given in one embodiment may be applied to other embodiments, and detailed description will be omitted to the extent of overlap.

With reference to FIG. 3, the structure and operation of the oil-less air compressor according to the present invention will be described. Figure 3 is a cross-sectional perspective view of an oil-less air compressor according to an embodiment of the present invention.

The oil-less air compressor 1000 is equipped with a drive motor 600 inside. The drive motor 600 is broadly classified into a rotatable rotor 615 and a stator 620 provided therein. The rotor 615 has a ring shape, and a plurality of magnets 610 are regularly arranged along its inner peripheral surface, and a stator coil 625 for providing electromagnetic force is provided at a position corresponding to the magnets 610. Since the rotation principle of the motor is a widely known technology, detailed explanation will be omitted. The rotor 615 is coupled to the motor shaft 70, so the rotation of the rotor 615 rotates the motor shaft 70, and the motor shaft 70 is coupled to the flywheel 640, which provides rotational inertia. there is.

The motor shaft 70 is connected to the eccentric cam 100 and is inserted into the eccentric hole 120 provided in the cam body 110 of the eccentric cam 100. When the motor shaft 70 rotates, the eccentric cam 100 rotates. At this time, the eccentric cam 100 is coupled to the motor shaft 70 so that it is eccentric with respect to the rotation center. The eccentric cam 100 is coupled to the connecting rod 210 through the main bearing 310, and the other side of the connecting rod 210 is combined with the piston 250 and inserted into the internal space 450 of the cylinder 400. do. The cylinder 400 has a cylindrical shape with an internal space 450, and the connecting rod 210 and the piston 250 coupled thereto reciprocate within the internal space 450. That is, by the connecting rod 210 connected to the eccentric cam 100 to enable relative movement, the rotational force produced by the drive motor 600 is transformed into a reciprocating motion that can compress or expand the inner space of the cylinder 450. It will happen.

The internal space 450 of the cylinder is communicated with the outside through an intake passage 510 and an exhaust passage 520, and a valve assembly 500 that selectively opens and closes the intake passage and exhaust passages 510 and 520 is coupled. there is.

When the eccentric cam 100 rotates and the piston 250 moves downward in the internal space 450 of the cylinder 400, the intake passage 510 is opened using the valve in the valve assembly 500 and the exhaust passage is opened. When 520 is closed, the internal space 450 expands, the pressure drops, and external air flows into the internal space 450 of the cylinder 400 through the inlet passage 510. This operation can also be used as a vacuum pump to suck in external air. Next, when the eccentric cam 100 is rotated with the intake passage 510 and the exhaust passage 520 closed, the piston 250 moves forward in a direction that reduces the internal space 450 of the cylinder 400, The air sucked into the internal space 450 is compressed. After compression occurs for a certain period of time, when the exhaust passage 520 is opened, the compressed air is provided to the outside. A piston ring may be coupled to the outer peripheral surface of the piston 250 to prevent compressed air in the internal space 450 from leaking.

At this time, the eccentric cam 100 is coupled to the connecting rod 210 through the main bearing 310, and if the distance (L) between the connecting rod 210 and the drive motor 600 becomes long, it may cause vibration and noise. Therefore, in order to support the motor shaft 70 in the meantime, a shock absorbing bearing 321 and a shaft are installed at positions spaced a certain distance (L1, L2) away from the main bearing 310 in the direction of the drive motor 600, respectively. Install bearing (322). Here, the sizes have the relationship L > L2 > L1. It is desirable to place the rod bearing adjacent to the shock-absorbing auxiliary bearing to minimize the separation distance (L1) between the connecting rod 210 and the shock-absorbing auxiliary bearing 321.

In addition, the main bearing 320 is coupled to the outer surface with an insert ring 240 made of a different metal material in an interference fit manner. The insert ring 240 is manufactured by die casting, and is press-fitted with the engaging protrusion 241 formed in the engaging groove 242 formed in the connecting rod 210. Instead of manufacturing the shock absorbing bearing 321 or the shaft bearing 322 using the interference fitting method, the main bearing 310 is manufactured by die casting the insert ring 240 and connecting rod 210 joined by the interference fitting method. By using it, the noise and vibration of the outer rotor type can be effectively suppressed.

Here, a more detailed structure of the valve assembly will be described with reference to FIGS. 4 and 5. Figure 4 is an exploded perspective view including the valve assembly, and Figure 5 is an exploded perspective view of the valve assembly enlarged.

The valve assembly 500 includes a valve plate 580, which includes a seating plate 581 located below and on which the valve 550 is seated, and a cover plate coupled to the seating plate 581. It consists of (581). The valve plate 580 is configured to have an intake passage 510 and an exhaust passage 520 formed therein to selectively communicate with the cylinder inner space 450 as described above, and a valve that performs an opening and closing role ( 550) is inserted.

The valve 550 is formed of a central portion 552 having a coupling groove 553 therein, and wing portions 551 connected to the central portion 552 and symmetrically formed on both sides. Wing portions 551 formed on both sides of the center 552 are positioned on the intake passage 510 and exhaust passage 520 to selectively open and close the passages 510 and 520, respectively. An O-ring may be mounted around the valve 550 for sealing, and an O-ring mounting groove may be formed.

The coupling groove 553 formed in the main body 552 allows the coupling protrusion 560 formed on the seating plate to be inserted so that the valve 550 is inserted into the correct position. Should the valve be inserted into the correct position?? Not only can it perform its function properly, but it can also eliminate the causes of opening/closing noise, vibration, and malfunctions. In addition, since the process of assembling the valve into the correct position is performed manually by a person, errors may occur, and since the valve 550 is not large in size, assembling it into the correct position is not as easy as expected, but it is not as easy as expected, but it is difficult to assemble it into the correct position. By combining the protrusions, it is formed into a double wing type, making it easy to assemble a valve type that can open and close the intake and exhaust passages at the same time.

Although the embodiments have been described with limited drawings as described above, those skilled in the art can apply various technical modifications and variations based on the above. For example, the described techniques are performed in a different order than the described method, and/or components of the described system, structure, device, circuit, etc. are combined or combined in a different form than the described method, or other components are used. Alternatively, appropriate results may be achieved even if substituted or substituted by an equivalent.

Therefore, other implementations, other embodiments, and equivalents of the claims also fall within the scope of the following claims.

10: Eccentric body 11: Eccentric hole
20: bearing 25, 250: piston
30, 210: connecting rod 40, 400: cylinder
45, 450: Cylinder inner space 50: Piston ring
61: exhaust valve 62: intake valve
63: exhaust passage 64: intake passage
70: Motor shaft 100: Eccentric cam
110: Cambody 120: Eccentric hole
310: main bearing 321: bearing for shock absorption
500: valve assembly 510: intake passage
520: exhaust port 550: valve
551: wing portion 552: center
553: Coupling groove 560: Coupling protrusion
640: flywheel

Claims (4)

A ring-shaped rotor that is rotatable and has a plurality of magnets along its inner circumferential surface;
a stator coil provided inside the rotor and providing electromagnetic force to rotate the rotor;
A motor shaft connected to the rotor and rotating integrally with it;
A flywheel coupled to one side of the motor shaft to provide rotational inertia;
An eccentric cam coupled to the other side of the motor shaft to rotate and to be eccentric with respect to the center of rotation;
a connecting rod rotatably connected to the eccentric cam and the main bearing and having a piston coupled to the other side;
a cylinder in which the piston reciprocates in an internal space and has an intake channel and an exhaust channel to intake and exhaust external air into the internal space;
A valve assembly that selectively opens and closes the intake and exhaust passages;
Includes,
The valve assembly is,
A valve consisting of a main body with a central coupling groove, symmetrically connected to both sides of the main body, and wings disposed on the intake and exhaust passages;
a seating plate on which the valve is mounted and which has a coupling protrusion inserted into the coupling groove; and
a cover plate coupled to the seating plate to seal it from the outside;
An oil-less air compressor comprising:
According to paragraph 1,
An oil-less air compressor, characterized in that an O-ring is inserted and coupled around the valve to form a seal.
According to paragraph 2,
An oil-less air compressor characterized in that the O-ring is coupled to an oil mounting groove formed on the seating plate.
In the valve assembly for an oilless air compressor including a valve that selectively opens and closes the intake and exhaust passages when external air is sucked in and compressed through the intake passage and then produced through the exhaust passage,
The valve is composed of a main body with a coupling groove in the center, a wing part that is symmetrically connected to both sides of the main body, and is disposed on the intake and exhaust passages,
A valve assembly for an oil-less air compressor, comprising a seating plate having a coupling protrusion inserted into and engaged with the coupling groove, and a cover plate coupled to the seating plate to seal it from the outside.

Images