KR101195425B1 - Connecting structure of refrigerant pipe - Google Patents

Abstract

PURPOSE: A connection structure of a refrigerating medium pipe is provided to prevent the leakage of refrigerating medium gas by tightly covering a tube expanding unit. CONSTITUTION: A tube expanding unit(21) is formed in a front surface unit of a refrigerating medium pipe(20). An internal extension unit(51) is formed in the front end unit of an inner sleeve(50). A protection unit(52) which tightly covers the front end of the tube expanding unit is formed in the front end of the inner extension unit. An external extension unit(31) is formed in the front end unit of an outer sleeve(30). A seal maintenance unit(32) is formed in the front end of the external extension unit.

Description

CONNECTING STRUCTURE OF REFRIGERANT PIPE

The present invention protects the expansion unit of each end, that is, the connection part of the refrigerant pipe for inducing the refrigerant gas in the indoor unit and the outdoor unit forming the cooling or heating device and the cooling / heating device (hereinafter referred to as "air conditioner") and At the same time relates to a connection structure of the refrigerant pipe to maintain the airtightness.

In general, air conditioners using refrigerants are classified into indoor units and outdoor units, and between the indoor unit and the outdoor unit, a refrigerant pipe for inducing the refrigerant gas is interconnected and installed between each end of the refrigerant pipe and the installation point of the indoor / outdoor air. It must be installed to maintain confidentiality.

As a conventional refrigerant pipe installed to maintain airtightness as described above, most of the conventional refrigerant pipes are made of copper (Cu) pipes, and as a case technique of interconnecting and installing each end of the refrigerant pipes using the copper pipes, the Japanese Utility Model Publication No. 50 As shown in -045946, briefly referring to FIG. 1A for the example technique, after inserting a fastener (1) capable of screwing at an end and forming a flared tube (2) at the end, The fastener is connected and constructed by fastening to the connecting body 3 provided in the indoor unit or the outdoor unit.

However, the copper tube has an advantage that can be installed to maintain the airtightness, but because of the high price and heavy weight has recently been used to replace the aluminum (Al) tube.

However, the aluminum tube has a problem that is vulnerable to corrosion and by coating the resin in order to overcome this, to compensate for the weakness of corrosion and at the same time enjoy the effect of heat insulation.

In addition, when the aluminum tube is installed to the connector provided in the indoor unit or the outdoor unit using the fastener according to the conventional connection method as described above, when the installer excessively tightens the fastener, the expansion of the relatively weak aluminum tube due to expansion processing The problem that the pipe part is broken or incised as shown in FIG. 1B, as well as the expansion part in contact with the connector is damaged by vibration and shock caused by the operation of the air conditioner.

In order to solve the above problem, in recent years, the connector 3 or the fastener 1 is sealed on the inner circumferential surface and the outer circumferential surface of the expansion pipe as shown in FIG. 1C such that the connecting body 3 or the fastener 1 does not directly contact the expansion pipe of the aluminum pipe 5. The member 7 is provided and the refrigerant pipe is connected.

However, as shown in the partial enlarged view of FIG. 1D, the vibration of the refrigerant and the air conditioner are actuated as the cover of the aluminum pipe is combined with the aluminum tube removed before the sealing member 7 is installed on the inner and outer circumferential surfaces of the expansion pipe. The expansion pipe part 2 is damaged between the sealing members due to excessive shock or the extension pipe part of the aluminum refrigerant pipe is damaged (broken or incised) due to excessive tightening of the fastener. There is a problem that the gas is leaked to lower the efficiency of the air conditioner.

The present invention has been invented to solve the above problems, the object of the present invention is to expand and secure by completely enclosing and protecting the expansion pipe of the refrigerant pipe by the inner expansion and protection of the inner sleeve and the outer expansion and airtight holding of the outer sleeve Even if a crack occurs or is damaged in the pipe part, it is possible to effectively prevent the leakage of refrigerant gas flowing through the cracked part or the damaged part.

The present invention for achieving the above object is a valve having a bolt portion is installed in the corresponding parts of the outdoor unit and the indoor unit, and a refrigerant pipe formed with an expansion tube formed by the end of the trumpet shape to be closely coupled to the end of the bolt portion, An outer sleeve having an extension formed by trumpet-shaping the tip so as to be in contact with the outer circumferential surface of the expansion pipe in close contact with the outer circumferential surface of the refrigerant pipe; In the refrigerant pipe connection structure, the inner sleeve is formed in the front end of the refrigerant pipe formed with the expansion pipe portion formed in the same shape as the expansion pipe portion is in close contact with the inner circumferential surface of the expansion pipe portion, the inner sleeve of the inner sleeve At the tip of the flayer, a protective part surrounding the tip of the expansion pipe of the refrigerant pipe and protecting Is formed to be bent and extended, and an extension part in close contact with the outer circumferential surface of the protection part is formed at the tip of the expansion pipe part so that the expansion pipe part of the refrigerant pipe is the fleece part and the protection part of the inner sleeve and the extension part and the extension part of the outer sleeve. It is characterized by being configured to completely wrap and protect by.

The rear outer circumferential surface of the outer sleeve is provided with a display portion for limiting the tightening of the nut, and a rear end of the outer sleeve has a locking portion of any one of grooves or protrusions, and the locking portion is located behind the nut. Coupling portions in the form of either protrusions or grooves to be joined are formed.

In addition, the inner sleeve is formed after the inner sleeve is coupled to the refrigerant pipe is formed a projection for limiting the flow in the refrigerant pipe, the refrigerant pipe is characterized in that the resin surface is coated on the outer surface.

As described above, according to the present invention, the expansion part of the refrigerant pipe is tightly wrapped and protected by the inner extension part and the protection part of the inner sleeve and the outer extension part and the airtight holding part of the outer sleeve so that a crack occurs in the expansion part of the refrigerant pipe. Even if it is damaged or damaged, it is possible to effectively prevent leakage of the refrigerant gas flowing through the cracked portion or the damaged portion.

Figure 1a is a state diagram showing a connection state of the copper tube using a conventional fastener and the connecting body,
Figure 1b is a state diagram showing a state in which the expansion pipe portion of the conventional refrigerant pipe is broken,
1C is a state diagram showing a state in which a refrigerant pipe is connected by providing a sealing member on an inner circumferential surface and an outer circumferential surface of a conventional expansion pipe part;
1D is an enlarged view illustrating an enlarged portion A of FIG. 1C;
Figure 2 is an exploded perspective view showing a state of the connection structure of the refrigerant pipe according to an embodiment of the present invention,
3 is a cross-sectional separation view showing a cross-sectional state of the connection structure of the refrigerant pipe according to an embodiment of the present invention.
4A to 4B are flowcharts sequentially showing a coupling state of a connection structure of a refrigerant pipe according to an embodiment of the present invention.
5 is a perspective view schematically showing a state of a connection structure of a refrigerant pipe according to another embodiment of the present invention;

Hereinafter, with reference to the accompanying drawings will be described in detail the connection structure of the refrigerant pipe of the present invention. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In the following description of the present invention, it is to be understood that the terminology used herein is for the purpose of describing the exemplary embodiments of the present invention and is not intended to limit the scope of the present invention. May be exaggerated for clarity and convenience of explanation, and the embodiments described in the present specification and the constitutions shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention It is to be understood that various equivalents and modifications may be substituted for those at the time of the present application.

Figure 2 is an exploded perspective view showing a state of the connection structure of the refrigerant pipe according to an embodiment of the present invention, Figure 3 is a cross-sectional view showing a cross-sectional state of the connection structure of the refrigerant pipe according to an embodiment of the present invention, 4A and 4B are flowcharts sequentially illustrating a coupling state of a connection structure of a refrigerant pipe according to an embodiment of the present invention.

As shown in Figure 2, the connection structure of the refrigerant pipe of the present invention is coupled to the valve 10 and the inclined surface of the valve 10 is formed with a bolt portion 11 is installed in the outdoor unit and the indoor unit of the cooling device A refrigerant pipe 20 to be installed, an inner sleeve 50 into which the refrigerant pipe 20 is fitted and coupled to the inside, an outer sleeve 30 inserted into and coupled to the outside of the refrigerant pipe 20, and the refrigerant pipe It is composed of a nut (40) inserted into the 20 and screwed with the bolt portion (11).

The valve 10 is installed in the outdoor unit and the indoor unit of the air conditioner, the bolt portion 11 is formed in the rear, the rear end of the bolt portion is formed with an inclined surface 13 gradually decreases the outer diameter toward the end portion.

Here, the shape of the valve 10 is one example, it may be that the bolt portion 11 is formed on both sides.

In addition, the refrigerant pipe 20 has a trumpet-shaped expansion pipe portion 21 formed at the front to be coupled to the inclined surface of the valve, and the outer surface thereof is coated with resin.

Here, the material of the refrigerant pipe 20 is preferably made of aluminum, which is advantageous in that aluminum material is cheaper and lighter than copper material or stainless steel material, as well as using an expander at the tip of the refrigerant pipe. This is to facilitate the deformation of the tip when expanding.

In this case, the material of the refrigerant pipe 20 is bar, it should be noted that in addition to the aluminum material may be any one of copper, iron, resin extrusion pipe.

In addition, the inner sleeve 50 is formed so that the front end is tightly coupled to the inside of the expansion tube 21, the inner extension portion 51 of the same shape as the expansion tube 21 is formed, the tip of the inner extension portion is A protection part 52 is formed to closely wrap and protect the front end of the expansion pipe part 21, and an inner fitting pipe 54 is formed at the rear of the internal expansion part 51 to be fitted into the refrigerant pipe.

That is, the inner fitting pipe 54 of the inner sleeve 50 is fitted into the refrigerant pipe 20, and the outer circumferential surface of the inner expansion part 51 is in surface contact with the inner circumferential surface of the expansion pipe 21. And, the protection unit 52 is tightly wrapped to protect the front end of the expansion pipe 21.

In addition, the inner sleeve 50 is coupled to the inside of the front end of the refrigerant pipe 20, so that the end of the valve 10 is not in direct contact with the expansion pipe 21 of the refrigerant pipe 20, the pressure of the refrigerant And preventing the expansion portion 21 from being damaged by vibration and shock caused by the operation of the refrigerant device.

Here, the inner sleeve 50 may be composed of only the inner extension portion in close contact with the inner circumferential surface of the expansion pipe portion 21 and the protection portion extended to be bent outward at the tip of the inner extension portion.

In addition, the outer sleeve 30 is fitted to the outside of the refrigerant pipe 20, so that the front end portion of the outer extension portion 31 having the same shape as the expansion pipe portion so as to be tightly coupled to the outside of the expansion pipe portion 21 Is formed, the front end of the outer extension portion is formed in the airtight holding portion 32 which is in contact with the surface to maintain the airtightness and the airtight portion 52 is formed, the outer fitting pipe which is fitted to the outside of the refrigerant pipe at the rear of the outer extension ( 35) is formed.

That is, the outer sleeve 30 is interposed between the refrigerant pipe 10 and the nut 40, the outer extension portion 31 of the outer sleeve 30 is the valve 10 and the nut 40 to be described later ), The expansion pipe 21 of the refrigerant pipe 20 is prevented from being damaged by the inclined surface 41 formed inside the nut 40 when the screw is excessively screwed.

In addition, the nut 40 has a tubular shape fitted to the outer circumferential surface of the refrigerant pipe 20. The nut 40 is fitted into the refrigerant pipe 20 to be screwed with the bolt part 11 to closely close the refrigerant pipe to the valve 10. Fix it.

Here, an inclined surface 41 formed to be inclined radially inward is formed at one inner side of the nut 40.

That is, when the nut 40 and the valve 10 are screwed together, the inclined surface 41 is in contact with the outer circumferential surface of the outer extension part 31 of the outer sleeve 30. In this case, the inclined surface 41 may be formed to have an inclination corresponding to the external extension portion 31.

Looking at the coupling state of the refrigerant pipe connection structure as described above in more detail, the inner fitting pipe 54 of the inner sleeve 50 is inserted into the inside of the refrigerant pipe 20, the internal expansion portion 51 of the inner sleeve ) Is installed in surface contact with the inner circumferential surface of the expansion pipe part 21 of the refrigerant pipe 20, the protection part 52 extended at the tip of the internal expansion part 51 is an expansion pipe part of the refrigerant pipe 20. 21) The tip is tightly wrapped to protect it.

Then, the outer sleeve 30 is inserted into the outside of the refrigerant pipe 20 so that the inner circumferential surface of the outer extension part 31 of the outer sleeve is in surface contact with the outer circumferential surface of the expansion pipe 21 of the refrigerant pipe 20. The airtight holding portion 32 formed at the tip of the expansion pipe portion 21 is in intimate surface contact with the outer circumferential surface of the protection portion 52 to protect the expansion pipe portion 15 of the refrigerant pipe 10 as well as maintain airtightness. In this state, the nut 40 and the valve 10 are screwed to connect the refrigerant pipe, and the airtight holding part 32 of the outer sleeve 30 surrounds the protection part 52. .

That is, the expansion pipe portion 21 of the refrigerant pipe 20 is completely formed by the inner expansion portion 51 and the protection portion 52 of the inner sleeve, the outer expansion portion 31 and the airtight holding portion 32 of the outer sleeve. It is wrapped around and protected.

At this time, as shown in FIG. 4A, in the state where the inner sleeve 50 and the outer sleeve 30 are coupled to the inside and the outside of the refrigerant pipe 20, the airtight holding part 32 of the outer sleeve 30 is inside the inside. The upper portion of the sleeve 50 is in an extended state in intimate surface contact with the protection portion 52, and in such a state, when the valve 10 and the nut 40 are coupled, the outer sleeve as shown in FIG. 4B. The hermetic holding part 32 of 30 is closely contacted along the curved surface of the hermetic holding part 32 so as to overlap the upper side of the protective part 52 of the inner sleeve 50.

As a result, when a crack occurs or is damaged in the expansion pipe portion 21 of the refrigerant pipe 20, it is possible to effectively prevent the refrigerant gas flowing through the refrigerant pipe 20 from leaking through the crack or damaged part. Will be.

In addition, the inner sleeve 50 and the outer sleeve 30 is preferably made of a stainless steel, because the characteristics of the stainless steel material does not cause cracking and tearing during corrosion and expansion work.

In this case, the material of the inner sleeve 50 and the outer sleeve 30 is a bar (RESIN) in addition to the stainless steel bar will be found.

In addition, the refrigerant pipe 20 is a resin coated on the outer surface, the resin coating layer 25 is not only the outer peripheral surface of the refrigerant pipe 20 but also the expansion portion formed in a trumpet shape at the tip of the refrigerant pipe 20 ( It may be desirable to be also formed on the outer circumferential surface of 21). This maintains tightness between the outer sleeve 30 and the expansion pipe portion 21 of the refrigerant pipe 20 due to the resin coating layer 25 to maintain airtightness.

In addition, the inner and outer surfaces of the inner sleeve 50 and the outer sleeve 30 is coated with a resin, for the purpose of maintaining the corrosion resistance, cold resistance and chemical resistance and airtightness.

In addition, the start point of the expansion pipe portion 21 of the refrigerant pipe 20, the start point of the internal extension portion 51 of the inner sleeve 50 and the start point of the external extension portion 31 of the outer sleeve 30 are mutually It is curved to make intimate contact.

That is, when expansion is performed in a state where the resin is coated on the surface of the refrigerant pipe, if the starting point of the expansion part of the refrigerant pipe 20 maintains the angle, cracks are generated in the respective parts to maintain the airtightness of the refrigerant. In addition, since the problem occurs that the parts are vulnerable and easily corroded. In the present invention, the starting point of the expansion part 21 of the refrigerant pipe 20 and the internal expansion part of the inner sleeve 50 are not included. 51) The starting point and the starting point of the outer extension part 31 of the outer sleeve 30 are processed to have a curved surface having no angle so as to make intimate surface contact with each other.

On the other hand, the inclined surface 13 formed at the end of the valve 10 has the same inclination angle as the inclination angle of the internal extension portion 51 of the inner sleeve 50, so that the inclined surface 41 is the internal extension portion ( 51), it is possible to prevent the leakage of refrigerant gas by advancing the clearance gap between the internal extension and the inclined surface.

In addition, a display unit 34 is formed on the rear outer circumferential surface of the outer sleeve 30 to restrict the tightening of the nut 40.

That is, when the nut 40 and the valve 10 are screwed together, when the display portion 34 of the outer sleeve 30 is exposed to the rear of the nut 40, the installer recognizes that the screw is in a proper screwing state. Due to this prevent excessive screw coupling between the nut 40 and the valve 10 it is possible to prevent damage to the expansion pipe portion 21 of the refrigerant pipe (20).

In addition, the rear end of the outer sleeve 30 is formed with a locking portion 33 of any one of the grooves or protrusions, the rear of the nut 40 of the protrusions or grooves to which the locking portion 33 is coupled Coupling portion 41 of any one form is formed.

That is, the engaging portion 33 and the coupling portion 41 is screwed to the bolt portion 11 of the valve 10 when the nut 40 is screwed excessively by informing the installer of the proper coupling state of the nut By preventing, the installer will be able to recognize the proper coupling state of the nut 40 by the noise generated while the engaging portion and the engaging portion are engaged with each other.

This prevents the installer from assembling the nut 40 excessively, thereby preventing damage to the expansion pipe portion 21 of the refrigerant pipe 20.

In addition, the inner sleeve 50 is provided with a protrusion 53 for restricting the flow in the refrigerant pipe after the inner sleeve is inserted and coupled to the refrigerant pipe 20.

That is, the inner fitting pipe 54 of the inner sleeve 50 is forcibly inserted into the refrigerant pipe 20 to limit the flow in the refrigerant pipe 20, and the pressure of the refrigerant and the operation of the refrigerant device In the vibration according to, the protrusion 53 for preventing the inner sleeve 50 from swinging is formed on the outer periphery of the inner fitting pipe (54).

Meanwhile, as another embodiment of the present invention, as shown in FIG. 5, when an extension of the refrigerant pipe is required during the installation of the refrigerant pipe, the refrigerant pipe connection structure according to the present invention may be used to hermetically and easily connect the two refrigerant pipes. There will be.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be < RTI ID = 0.0 > appreciated by one of ordinary skill in the art, that various changes and modifications may be made without departing from the scope of the invention. Therefore, the scope of the present invention is not limited to the above-described embodiments, but should be determined by equivalents to the claims, as well as the following claims.

Description of the Related Art
10: valve 11: bolt portion
12: Euro 13: Slope
20: refrigerant pipe 21: expansion pipe
25: resin coating layer 30: outer sleeve
31: external extension 32: confidentiality
33: latching portion 34: display portion
35: outer fitting pipe 40: nut
41: slope 50: inner sleeve
51: internal expansion unit 52: protection unit
53: protrusion 54: inner fitting pipe

Claims (8)

A valve (10) installed at a corresponding part of an outdoor unit and an indoor unit of a cooling and heating apparatus, and having a bolt portion (11) formed at a rear side thereof, and an inclined surface (13) having an outer diameter gradually decreasing toward an end portion at a rear end of the bulge portion;
A trumpet-shaped expansion pipe portion 21 is formed at the front to be coupled to the inclined surface of the valve, and the outer surface of the refrigerant pipe is resin coated;
The front end portion is formed with an internal extension 51 having the same shape as that of the expansion portion so as to be tightly coupled inside the expansion pipe, and the front end of the internal expansion portion tightly surrounds and protects the front end of the expansion pipe. An inner sleeve 50 formed to extend and form an inner fitting pipe 54 fitted into the refrigerant pipe to the rear of the inner extension part;
The front end portion is formed to be tightly coupled to the outside of the expansion pipe portion is formed with an external extension portion 31 having the same shape as the expansion pipe portion, the front end of the outer extension portion of the airtight holding that the surface contact with the protector 52 to maintain airtightness An outer sleeve 30 formed with an extension portion 32 and having an outer fitting pipe 35 fitted to the outside of the refrigerant pipe at the rear of the outer extension part;
And a nut (40) inserted into the refrigerant pipe and screwed to the bolt part (11) to closely couple and fix the refrigerant pipe to the valve (10).
The method of claim 1,
Connection structure of the refrigerant pipe, characterized in that the display portion (34) for limiting the tightening of the nut (40) is formed on the rear outer peripheral surface of the outer sleeve (30). The method of claim 1,
The rear end of the outer sleeve 30 is formed with a locking portion 33 of any one of the grooves or protrusions, the inner rear of the nut 40 any of the protrusions or grooves to which the locking portion 33 is coupled. Connection structure of the refrigerant pipe, characterized in that the coupling portion 41 is formed in one form. The method of claim 1,
The inner sleeve 50 is connected to the refrigerant pipe, characterized in that the inner sleeve is inserted and coupled to the refrigerant pipe 20, the projection 53 is formed to limit the flow in the refrigerant pipe. The method of claim 1,
The material of the refrigerant pipe 20 is a connection structure of the refrigerant pipe, characterized in that any one of copper, iron, resin extrusion pipe, aluminum. The method of claim 1,
The material of the inner sleeve 50 and the outer sleeve 30 is a stainless steel or resin (resin) connection structure of the refrigerant pipe. The method of claim 1,
The connecting portion of the refrigerant pipe connecting structure of the refrigerant pipe, the start point of the internal expansion portion of the inner sleeve and the start point of the external expansion portion of the outer sleeve are all curved to be in close contact with each other. 8. The method according to any one of claims 1 to 7,
The inner sleeve and the outer sleeve is connected structure of the refrigerant pipe, characterized in that the inner and outer surfaces are resin coated.

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