KR101686009B1 - Check Valve and Air Conditioner having The Same - Google Patents

Abstract

A check valve capable of preventing rotation of a plunger inside a check valve and reducing operation noise, and an air conditioner including the same. The check valve includes a case in which a flow path is formed, a plunger provided on the flow path so as to move forward and backward and having at least one wing portion formed on a side thereof, a seat portion opened and closed by one end portion of the plunger, Wherein the case includes at least one rotation preventing protrusion formed to protrude therein for restricting rotation of the wing portion, and the plunger has a noise reducing protrusion protruded toward the stopper at the other end thereof .

Description

[0001] The present invention relates to a check valve and an air conditioner having the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve and an air conditioner including the same, and more particularly, to a check valve and an air conditioner including the same, which can prevent rotation of a plunger inside a check valve and reduce operation noise.

Generally, the air conditioner uses the endothermic and exothermic effects generated by evaporating or liquefying the refrigerant circulating in the refrigerating cycle in which the compressor, the condenser, the refrigerant expansion valve, and the evaporator are connected by the refrigerant tube to form a closed circuit, Or heating.

Such an air conditioner can be divided into a separate type air conditioner and an integrated type air conditioner. In the case of a separate type air conditioner, an outdoor unit and an indoor unit are installed outdoors and indoors, respectively, and they are connected to each other by a refrigerant pipe.

In addition, check valves for connecting the refrigerant to the refrigerant in only one direction are connected to the interior of the air conditioner.

A check valve is a valve that prevents fluid from flowing in one direction and not flowing in the opposite direction. It is installed to prevent reverse flow of fluid to hydraulic circuit, piping for refrigeration cycle, and so on.

Such a check valve prevents the reverse flow by preventing the plunger from obstructing the flow path when the plunger is inserted into the valve tube and the reverse flow occurs.

However, due to the flow of the refrigerant, the plunger installed inside the check valve is rotated and moved during the opening and closing operation, and friction occurs with the outer case at this time and noise is generated due to the contact. Such friction causes shortening of check valve life, and noise causes deterioration of sensibility of the air conditioner to which the check valve is attached.

An aspect of the present invention is to provide a check valve and an air conditioner including the same, which improve the structure so that rotation of the plunger inside the check valve is prevented and operation noise is reduced.

A check valve according to an aspect of the present invention includes: a case in which a flow path is formed; a plunger provided so as to move forward and backward on the flow path; a seat portion opened and closed by one end of the plunger; And a stopper, wherein the case includes a rotation preventing portion for preventing rotation of the plunger.

The rotation preventing portion includes at least one rotation preventing protrusion protruding from the inside of the case.

The plunger includes at least one wing portion formed on a side surface, and the rotation preventing protrusion restricts rotation of the wing portion.

The wing portions are formed at equal intervals along the outer circumferential surface of the plunger, and the rotation preventing protrusions are formed at equal intervals along the inner circumferential surface of the case.

The plunger includes a noise reducing portion at the other end contacting with the stopper.

The noise reduction unit includes a noise reduction protrusion protruding toward the stopper.

The noise reduction protrusion portion makes point contact with the stopper.

The seat portion is made of a brass material, the stopper is made of stainless steel, and the plunger is made of synthetic resin.

A check valve according to an embodiment of the present invention includes a case in which a flow path is formed, a plunger movably moved forward and backward on the flow path and having at least one wing portion formed on a side thereof, And a stopper for restricting the forward and backward movement of the plunger, wherein the case includes at least one rotation preventing protrusion formed to protrude therein for restricting rotation of the wing portion, and the plunger has, at the other end, And a noise reducing protrusion protruding toward the lower surface of the housing.

According to another aspect of the present invention, there is provided an air conditioner including a refrigerant pipe and a check valve connected to the refrigerant pipe to control the flow of the refrigerant, wherein the check valve includes a case in which a flow path is formed, And a stopper for restricting the forward and backward movement of the plunger, wherein the case includes a stopper, which is movable in the forward and backward directions, and which has at least one wing portion formed on a side surface thereof, a seat portion opened and closed by one end portion of the plunger, And at least one or more rotation preventing protrusions protruding inward to restrict rotation of the wing portion.

According to another aspect of the present invention, there is provided an air conditioner including a refrigerant pipe and a check valve connected to the refrigerant pipe to control the flow of the refrigerant, wherein the check valve includes a case in which a flow path is formed, And a stopper for restricting the advancing and retreating movement of the plunger, wherein the plunger is formed to protrude toward the stopper at the other end portion of the plunger, And a noise reduction projection.

According to another aspect of the present invention, there is provided an air conditioner including a refrigerant pipe and a check valve connected to the refrigerant pipe to control the flow of the refrigerant, wherein the check valve includes a case in which a flow path is formed, And a stopper for restricting the forward and backward movement of the plunger, wherein the case includes a stopper, which is movable in the forward and backward directions, and which has at least one wing portion formed on a side surface thereof, a seat portion opened and closed by one end portion of the plunger, And at least one rotation preventing protrusion protruding from the inside to limit the rotation of the wing portion, wherein the plunger includes a noise reducing protrusion protruding toward the stopper at the other end.

The check valve according to an embodiment of the present invention described above can prevent the rotation of the plunger by preventing the rotation of the plunger, thereby preventing the wear and friction noise due to rotation.

Further, by forming the noise reducing projections on the plunger, the contact noise generated upon contact with the stopper can be remarkably reduced.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a check valve according to an embodiment of the present invention, FIG. 2 is an exploded cross-sectional view of a check valve according to an embodiment of the present invention, FIG. 3 is a perspective view of a plunger according to an embodiment of the present invention, And Fig. 4 is a sectional view taken along line II in Fig.

1 and 2, a check valve 1 according to an embodiment of the present invention includes a case 10 in which an outer body is formed and a flow path 15 is formed therein, A seat portion 12 that is opened and closed by the seat contact portion 105 of the plunger 100 and a stopper 30 that restricts the forward and backward movement of the plunger 100, .

The case 10 has an elongated rod shape having a hollow at its center as a whole and has a fluid inlet 17 formed on the lower side thereof and a fluid outlet 18 formed on the upper side thereof and the fluid inlet 17 and the fluid outlet 18, A flow path 15 is formed inside. A seat portion 12 on which the plunger 100 is seated is formed in the middle portion of the flow path 15. Rotation preventing protrusions 20a, 20b and 20c protrude toward the center of the case 10 at the upper side of the seat portion 12. [

3 and 4, the plunger 100 includes a body portion 115 forming a body of the plunger 100, a seat portion 12 extending from one side of the body portion 115, 120a, 120b, and 120c extending from the side of the body portion 115 and a noise reducing protrusion (not shown) protruding from the other side of the body portion 115 125).

The plunger 100 is made of synthetic resin and the sheet contacting portion 105 is formed to have a slope 105a corresponding to the shape of the sheet portion 12 to be described later, The opening / closing flow path 16 is closed by contacting the inclined surface 12a. The wing portions 120a, 120b and 120c are formed at equal intervals along the side surface of the body portion 115 and are formed in close contact with the inner wall of the case 10 so that the plunger 100 can move only up and down. The noise reduction protrusions 125 protrude from the other side of the body portion 115 and make point contact with the stopper 30 when the opening and closing flow path 16 is opened to reduce contact noise .

The seat portion 12 is formed by protruding on the inner surface of the case 10 so that the seat contact portion 105 of the plunger 100 can be seated. The through hole at the center of the seat portion 12 becomes the opening / closing passage 16 which is opened and closed by the seat contact portion 105. [ The sheet portion 12 is also formed with an inclined surface 12a so as to be in contact with the inclined surface 105a of the sheet contacting portion 105. [ The seat portion 12 is made of a brass material.

The stopper 30 is in the form of a pin and is fitted to the case 10 by being inserted into the stopper holes 35a and 35b formed in the upper portion of the case 10. When the fluid flows, the opening / closing flow path 16 is opened and the plunger 100 moves upward, so that the noise reduction protrusion 125 of the plunger 100 and the stopper 30 come into contact with each other, Is limited. The stopper 30 is made of stainless steel.

5 is an internal block diagram of an air conditioner with a check valve according to an embodiment of the present invention.

5, a compressor 5 for compressing the refrigerant to a high temperature and a high pressure is provided in the air conditioner, and a high-temperature high-pressure And an oil separator 3 which is contained in the refrigerant discharged to the outside of the compressor 5 and separates the oil discharged simultaneously with the refrigerant. The oil separator 3 is formed into a cylindrical shape having a predetermined diameter and height. On the upper side of the oil separator (3), a check valve (1) connected by a pipe is positioned in parallel with a direction in which gravity acts. The components are interconnected by piping.

Hereinafter, the operation of the check valve will be described in accordance with a preferred embodiment of the present invention.

Fig. 6A is a sectional view taken along the line II-II in Fig. 2, and Fig. 6B is a sectional view taken along the line II-II in Fig. 2, showing a closed state of the check valve.

When the user operates the air conditioner, the compressor 5 is driven to compress the refrigerant sucked into the suction pipe 8 to high temperature and high pressure (see FIG. 5). At this time, the oil flows into the compressor 5 to cool the frictional heat generated when the compressor 5 is driven, and the oil flowing into the internal space of the compressor 5 flows into the inside of the compressor 5 Is contained in the refrigerant compressed in the space at a high temperature and a high pressure and is discharged to the outside of the compressor (5). The oil contained in the refrigerant discharged to the outside of the compressor 5 is separated from the oil separator 3 and returned to the compressor 5 through the oil return pipe 6. At this time, the refrigerant and the oil are separated due to the specific gravity difference in the oil separator 6. The relatively heavy oil flows down to the oil separator 6 and moves to the oil return pipe. The relatively light refrigerant flows through the oil separator 6, And flows into the check valve 1. The check valve 1,

 The refrigerant discharged while rotating flows into the fluid inlet (17) of the check valve (1) through the refrigerant pipe (7). At this time, when the refrigerant does not flow, the plunger 100 comes into contact with the seat portion 12 under the influence of gravity to close the open / close flow path 16, and the refrigerant flowing into the fluid flow inlet 17 flows into the flow path 15 , The refrigerant starts to rise due to the pressure of the refrigerant. The sheet contacting portion 105 of the plunger 100 is spaced apart from the seat portion 12 and the refrigerant flowing into the opening and closing flow path 16 moves while rotating upward. I also want to rotate.

However, since the wing portions 120a, 120b and 120c of the plunger 100 are restricted by the rotation preventing protrusions 20a, 20b and 20c formed in the case 10, the plunger 100 can not rotate, It only makes a slight flow in the main direction. 4, one of the wing portions 120a, 120b and 120c of the plunger 100 is provided with the rotation preventing projections 20a located on both sides of the movement path , 20c, the movable range is limited to "X" in FIG. The other wing portions 120b are also limited to the range of "Y" in FIG. 4 due to the rotation preventing protrusions 20b, 20a located on both sides of the movement path. Likewise, the other wing portion 120c is limited to the range of "Z" in FIG. 4 due to the rotation preventing protrusions 20c, 20b located on both sides of the movement path.

Accordingly, the rotation of the plunger 100 is restricted in this way, so that the abrasion due to the friction between the wings 120a, 120b, 120c and the inner wall of the case 10 is significantly reduced, and the occurrence of abnormal noise It is greatly reduced. As a result, the abrasion of the plunger 100 is reduced and the service life of the check valve 1 is extended. As a result of the abnormal noise reduction, the sensibility of the air conditioner to which the check valve 1 is attached is greatly improved.

The plunger 100 continues to rise due to the refrigerant flowing into the switching valve 16, and the rise of the plunger 100 is restricted by the stopper 30. [ In other words, the plunger 100, which has been lifted, comes into contact with the stopper 30 when the noise reduction protrusion 125 comes into contact with the stopper 30, At this time, the noise reduction protrusion 125 and the stopper 30 make a point contact 129 at a certain point on the stopper 30. The stopper 30 and the body portion 115 of the plunger 100 are brought into surface contact or line contact with each other when the noise reduction protrusion 125 is not present. However, since the noise reduction protrusion 125 is formed on one side of the body portion 115 to make the point contact 129 with the stopper 30, the contact area with the stopper 30 is reduced, The sound is greatly reduced.

When the user stops the air conditioner, the driving of the compressor 5 is stopped, and the refrigerant discharged to the discharge pipe 9 is no longer discharged. Therefore, the refrigerant flowing into the check valve 1 through the refrigerant pipe 7 is no longer introduced. Then, the plunger 100 which has risen to the stopper 30 due to gravity starts to descend again. The sheet contacting portion 105 of the plunger 100 comes into contact with the seat portion 12. [ The inclined surface 105a of the sheet contacting portion 105 and the inclined surface 12a of the seat portion 12 come into contact with each other to close the opening and closing flow path 16. [ The refrigerant does not flow into the check valve 1 and therefore the opening and closing flow path 16 is closed by the plunger 100 even if the refrigerant at the upper portion of the case 10 moves to the lower portion B, 16), and becomes stagnant on the spot.

That is, when the refrigerant flows into the check valve 1, the plunger 100 rises and the refrigerant flows from the lower part to the upper part while the opening and closing flow path 16 is opened. If the refrigerant does not flow into the check valve 1, Is closed to close the opening / closing flow path 16, and the refrigerant stagnates on the spot, resulting in the flow of fluid only in one direction.

Although the rotation preventing protrusions 20a, 20b and 20c of the case 10 and the wings 120a, 120b and 120c of the plunger 100 are formed by three in each of the above embodiments, Is freely changeable.

The present invention has been shown and described with respect to specific preferred embodiments thereof. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. .

1 is an external perspective view of a check valve according to an embodiment of the present invention.

2 is an exploded cross-sectional view of a check valve according to an embodiment of the present invention.

3 is a perspective view of a plunger according to an embodiment of the present invention.

4 is a sectional view taken along the line I-I in Fig.

5 is an internal block diagram of an air conditioner with a check valve according to an embodiment of the present invention.

Fig. 6A is a cross-sectional view taken along the line II-II in Fig. 2, and is a state diagram showing the open state of the check valve.

Fig. 6B is a sectional view taken along line II-II in Fig. 2, and is a state diagram showing the closed state of the check valve.

Description of the Related Art [0002]

1: Check valve 3: Oil separator

5: Compressor 10: Case

12: seat portion 15:

16: opening / closing flow path 17: fluid inlet

18: Fluid outlet

20a, 20b, 20c:

30: stopper 35a, 35b: stopper hole

100: plunger 105: sheet contact portion

115:

120a, 120b, 120c:

125: noise reduction projection 129: line contact portion

Claims (16)

A case in which a flow path is formed, And a plunger provided on the flow path so as to move forward and backward and open and close the flow path, the plunger having a body portion and a plurality of wings extending from a side surface of the body portion, The case includes at least one rotation preventing protrusion protruding from the inside of the case, Wherein the plunger is installed in the case so as to be rotatable in both directions when refrigerant flows into the flow path, Wherein the plunger has a limited range of angles that are rotatable in both directions by the anti-rotation protuberances. delete delete The method according to claim 1, And the rotation preventing protrusion is located between the plurality of vanes along the inner circumferential surface of the case. The method according to claim 1, Wherein the check valve includes a stopper for restricting the forward and backward movement of the plunger, Wherein the plunger includes a noise reducing portion at the other end that contacts the stopper. 6. The method of claim 5, Wherein the noise reduction unit includes a noise reduction protrusion protruding toward the stopper. The method according to claim 6, And the noise reduction projection is in point contact with the stopper. 8. The method of claim 7, Wherein the noise reduction protrusion is formed in a hemispherical shape toward the stopper. 9. The method of claim 8, Wherein the plunger is made of synthetic resin, and the stopper is made of stainless steel. A case in which a flow path is formed, A plunger provided on the flow path so as to be movable forward and backward and having at least one wing portion on a side surface thereof, A seat portion opened and closed by one end of the plunger, And a stopper restricting forward and backward movement of the plunger, The case includes at least one rotation preventing protrusion formed to protrude therein to limit a rotatable range of the wing portion, Wherein the plunger includes a noise reducing protrusion formed on the other end of the plunger so as to project in a hemispherical shape toward the stopper, Wherein the plunger is installed in the case so as to be rotatable in both directions when refrigerant flows into the flow path, Wherein the plunger has a limited range of angles that are rotatable in both directions by the anti-rotation protuberances. An air conditioner comprising: a refrigerant pipe; and a check valve connected to the refrigerant pipe for controlling the flow of the refrigerant, The check valve includes a case in which a flow path is formed, a plunger movably provided on the flow path and formed with at least one wing portion on a side surface thereof, a seat portion opened and closed by one end portion of the plunger, A stopper for restricting movement, The case includes at least one rotation preventing protrusion formed to protrude therein to limit a rotatable range of the wing portion, Wherein the plunger is installed in the case so as to be rotatable in both directions when refrigerant flows into the flow path, Wherein the plunger has a limited range of angles that can be rotated in both directions by the rotation preventing protrusion. delete 12. The method of claim 11, Wherein the at least one wing portion includes a plurality of wing portions disposed along an outer circumferential surface of the plunger, And the rotation preventing protrusion is located between the plurality of wing portions along the inner circumferential surface of the case. 12. The method of claim 11, Wherein the plunger includes a noise reducing protrusion protruding toward the stopper at the other end. 15. The method of claim 14, Wherein the noise reduction protrusions are protruded toward the stopper in a hemispherical shape. An air conditioner comprising: a refrigerant pipe; and a check valve connected to the refrigerant pipe for controlling the flow of the refrigerant, The check valve includes a case in which a flow path is formed, a plunger movably forward and backward on the flow path and having at least one wing portion on a side surface thereof, a seat portion opened and closed by one end portion of the plunger, A stopper for restricting movement, The case includes at least one rotation preventing protrusion formed to protrude therein to limit a rotatable range of the wing portion, Wherein the plunger includes a noise reducing protrusion formed on the other end of the plunger so as to project in a hemispherical shape toward the stopper, Wherein the plunger is installed in the case so as to be rotatable in both directions when refrigerant flows into the flow path, Wherein the plunger has a limited range of angles that can be rotated in both directions by the rotation preventing protrusion.

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