KR20230103378A - Link device of valve and pipe for prevention of galvanic corrosion and linking without welding - Google Patents

Abstract

The present invention relates to a connection device between valves and pipes for preventing corrosion of dissimilar materials and for weld-free connection, which prevents refrigerant leakage by connecting valves and pipes without complicated operations such as welding of air conditioner pipes, and prevents galvanic corrosion between valves and pipes that occurs when connecting pipes of dissimilar materials. The present invention prevents galvanic corrosion caused by joining dissimilar materials by blocking direct contact between pipes and valves, and enables cost reduction by adopting a structure that simplifies an internal structure, thereby capable of preventing malfunctions before and after fastening and ensuring ease of installation. The connection device of the present invention comprises: a flare nut; one or more sealing means; a fixing means; a protection means; an upper boss part; and a lower boss part.

Description

Link device of valve and pipe for prevention of galvanic corrosion and linking without welding}

The present invention relates to a connection device between a valve and a pipe, and more particularly, to a connection device for connecting an air conditioner refrigerant pipe (hereinafter referred to as a pipe) and a service valve (hereinafter referred to as a valve). In other words, it is possible to prevent leakage of refrigerant by connecting valves and pipes without complicated operations such as welding of pipes, and to prevent galvanic corrosion between valves and pipes that occurs when connecting pipes of different materials. Corrosion prevention and non-welding connection It relates to a valve and pipe connection device for

The air conditioner piping is a part that connects the indoor unit and the outdoor unit, and is generally used in connection with a valve. Piping is made of copper or aluminum, and there are differences in cost and performance depending on the material, so it is selectively used according to the characteristics of the site where the air conditioner is installed.

In the case of copper pipe, it is widely used because it has the advantage of being flexible, good formability, and excellent corrosion resistance and heat transfer property. However, there is a problem that the strength of the welded portion is weak and easily damaged, and the welded portion is easily corroded due to welding heat. In addition, with the recent surge in copper prices, the economic burden on copper (copper) piping is increasing.

In the case of aluminum piping, attempts to replace copper piping are increasing because of its low unit price, low specific gravity, and excellent heat transfer characteristics compared to copper.

However, the aluminum pipe has a problem in that refrigerant leaks due to galvanic corrosion occurring in the aluminum pipe due to bonding of dissimilar materials upon contact with the copper valve.

In addition, since the copper pipe and the aluminum pipe are typically connected through welding, the risk of installation work is high, and the installation work is complicated and difficult.

Therefore, various attempts are being made to facilitate the connection between the valve and the aluminum pipe and to solve various problems associated with the use of the aluminum pipe.

Republic of Korea Patent No. 10-2021912 (applied on March 25, 2013) Republic of Korea Patent Registration No. 10-2158368 (2011.09.30. Application) Republic of Korea Patent No. 10-1171692 (applied on March 27, 2019) Republic of Korea Utility Model Publication No. 20-2019-0004898 (application filed on December 4, 2019)

An object of the present invention is to prevent galvanic corrosion due to bonding of dissimilar materials that occurs when connecting piping for refrigerant in a conventional air conditioner described above, as well as to secure airtightness and ease of work.

Attempts to solve the problems occurring in dissimilar material joining piping made of copper-aluminum, etc. have been continuously made until now, but only partial improvements have been made, such as securing workability, securing airtightness, securing economic feasibility, and blocking galvanic corrosion. come.

In the case of Korean Registered Patent No. 10-2021912, in order to improve the corrosion problem that occurs when copper-aluminum dissimilar materials are joined, a packing member is provided to the flare nut to prevent direct contact between the flare nut and the pipe, and moisture, air or foreign matter through the gap However, direct contact between the end of the pipe and the nut makes it impossible to prevent galvanic corrosion due to bonding of dissimilar materials. The disadvantage is that the installation is complicated because it must be expanded.

In the case of Korean Registered Patent No. 10-2158368, a sealing material was added between the valve and the connecting pipe to block the contact between the valve and the pipe and prevent the inflow of external air, moisture, and foreign substances to improve the problem, but the pipe-flare Contacts between flare nuts are energized, causing galvanic corrosion due to contact with different materials, and installation is complicated because the end of the pipe must be expanded during installation.

In the case of Korean Registered Patent No. 10-1171692, welding was omitted during installation and the connection between the valve and the pipe was simplified, but a sharp metal grab ring directly contacted the metal refrigerant pipe, or in the case of a resin-coated aluminum pipe, the resin coating layer It penetrates and comes into direct contact with the pipe metal, so galvanic corrosion cannot be prevented.

In addition, the installation process such as coupling with plastic parts for installation, removal, and disposal is complicated, and it is difficult to use standard service valves, so there is a disadvantage that a valve of special specifications must be prepared for installation.

In the case of Republic of Korea Utility Model Publication No. 20-2019-0004898, a sleeve, compression ring (O-ring), washer, and grab ring are inserted between the valve and the pipe to block direct contact between the valve and the pipe and block external air, moisture and In an attempt to improve the problem by preventing the inflow of foreign substances, etc., the sharp metal grab ring directly contacts the metal refrigerant pipe, or in the case of resin-coated aluminum pipe, it penetrates the resin coating layer and directly contacts the metal pipe, so galvanic corrosion cannot be prevented. .

In addition, since many parts are required for the operation of the device, malfunction may occur during connection work, and manufacturing cost increases. In addition, there is a disadvantage that damage to internal parts may occur when fastening with excessive force during installation work.

The present invention blocks direct contact between a pipe for an air conditioner outdoor unit and a valve to prevent galvanic corrosion due to bonding of dissimilar materials, and problems caused by galvanic corrosion between the pipe and a flared nut that occur when the resin coating of the pipe is peeled off while connecting the aluminum pipe. By adopting a structure that solves and simplifies the internal structure at the same time, the purpose is to enable cost reduction, prevent malfunction before and after fastening, and secure the simplicity of installation.

In order to achieve the above object, the present invention according to the first embodiment,

In the pipe connection device for connecting the pipe to the valve;

A flare nut consisting of an upper end and a lower end having a larger inner diameter than the upper end, and the upper end and the lower end being divided into first locking jaws;

an upper end of which a first screw hole corresponding to the first screw of the valve is formed on the inner periphery of the upper end of the flare nut and is fastened to the valve through screw coupling;

one or more sealing means for sealing the refrigerant to the inner diameter of the lower end of the flare nut;

Fixing means for fixing the pipe to the inner diameter portion of the bottom of the flare nut;

A protective means for preventing damage to the fixing means on the inner diameter of the lower end of the flare nut;

an upper boss portion positioned over a lower portion of the upper inner diameter portion of the flare nut and an upper portion of the lower inner diameter portion of the flare nut, and positioned above the sealing means, the fixing means, and the protecting means;

The upper boss part has a compression part for compressing the sealing means, a stop part for stopping the insertion of the end of the pipe, a support part that has a certain length up to the end of the valve, and contacts the valve according to the progress of the fastening and serves as a support, and the first locking jaw An upper boss having a first seating step corresponding to and being made of a polymer material;

It is located in the inner diameter of the lower end, the outer periphery corresponds to the inner diameter of the lower end, the inner periphery corresponds to the outer diameter of the pipe, is located below the fixing means, the protecting means, and the sealing means, and the A lower boss portion fixed to the bottom of the flare nut; Including,

The fixing means and the protecting means block the electrical contact between the pipe and the flare nut, and the electrical contact between the connecting device and the pipe is fundamentally blocked. We propose a connection device for

Differently, the present invention according to the second embodiment for achieving the above object,

In the pipe connection device for connecting the pipe to the valve;

A flare nut consisting of an upper end, a middle end having the smallest inner diameter, and a lower end;

In the top of the nut, a first screw hole corresponding to the first screw of the valve is formed on the inner periphery and the top is fastened to the valve through screw coupling;

In the middle of the flare nut, the compression part for compressing the inner diameter of the middle part to the sealing means, the stop part for stopping the insertion of the end of the pipe, and the end of the valve have a certain length, and act as a support by contacting the valve as the fastening progresses a stop having a support;

one or more sealing means for sealing the refrigerant to the inner diameter of the lower end of the flare nut;

Fixing means for fixing the pipe to the inner diameter portion of the bottom of the flare nut;

A protective means for preventing damage to the fixing means on the inner diameter of the lower end of the flare nut;

It is located in the inner diameter of the lower end of the flare nut, the outer periphery corresponds to the inner diameter of the lower end, the inner periphery corresponds to the outer diameter of the pipe, is located below the fixing means, the protecting means, and the sealing means, and is screwed (second A lower boss portion fixed to the flare nut by a screw thread and a second screw hole);

Including; a stopper where the lower boss portion progresses in the compression direction and then stops progressing;

The fixing means and the protecting means block the electrical contact between the pipe and the flare nut, and the electrical contact between the connecting device and the pipe is fundamentally blocked. provides a connecting device.

Alternatively, the present invention according to the third embodiment for achieving the above object,

In the pipe connection device for connecting the pipe to the valve;

A flare nut consisting of an upper end, a middle end having the smallest inner diameter, and a lower end;

In the top of the nut, a first screw hole corresponding to the first screw of the valve is formed on the inner periphery and the top is fastened to the valve through screw coupling;

In the middle of the nut, a compression part for compressing the inner diameter of the middle part to the sealing means, a stop part for stopping the insertion of the end of the pipe, and a support part having a certain length to the end of the valve and contacting the valve as the fastening progresses to serve as a support Interruption with ;

one or more sealing means for sealing the refrigerant to the inner diameter of the lower end of the nut;

Fixing means using a grab washer made of metal or polymer material for fixing the pipe to the inner diameter portion of the lower end of the nut;

It is located in the inner diameter of the lower end of the nut, the outer periphery corresponds to the inner diameter of the lower end, the inner periphery corresponds to the outer diameter of the pipe, is located below the fixing means, the protecting means, and the sealing means, and is screwed (second screw wire). and a second screw hole) to secure the lower boss portion to the flare nut;

The fixing means blocks the electrical contact between the pipe and the flare nut, and the connection between the valve and the pipe for preventing corrosion and welding-free connection of dissimilar materials, characterized in that the electrical contact between the connecting device and the pipe is fundamentally blocked suggests

In the invention of the first embodiment described above,

There is a protruding jaw at the lower part of the inner diameter at the bottom of the flare nut to stop the upper boss from moving in the compression direction. There is a protruding jaw at the upper part of the bottom of the flare nut to stop the lower boss from moving in the compression direction. It is preferable to further include one of the limit line of the screw line or the screw hole and a combination thereof to stop the lower boss part from moving in the compression direction by stopping the end of the screw line or the screw hole of the boss part and the nut body.

In the invention of the third embodiment described above,

It is preferable that the lower boss portion has a stopper to stop the progress while progressing in the compression direction.

In the invention of the second or third embodiment described above,

The stopping jaw for stopping the progress has a protruding jaw on the upper part of the lower inner diameter of the flare nut to stop the lower boss portion from moving in the compression direction, and is located on the lower outer diameter of the nut and protrudes to prevent the lower boss portion from moving in the compression direction A structure in which the stopping jaw, the lower boss part and the screw line or the end of the screw hole of the nut body are stopped to stop the lower boss part from progressing in the compression direction any longer, the limit line of the screw line or the screw hole, and the lower boss part wrapping the bottom of the flare nut The lower end of the flare nut serves as a protruding jaw to stop the lower boss from moving in the compression direction, and a jaw corresponding to the lower end of the flare nut is placed at the lower part of the lower boss to act as a protruding jaw to lower the boss It is preferable to configure the portion to be one of a stopper that stops progress in the compression direction and a combination thereof.

In the invention of the above-described embodiments, the stopper may be a flare nut and a separable type, and in the case of a separable type, it is preferable to be a ring-shaped metal or polymer material.

In the above-described first or second embodiment, the fixing means is preferably implemented as one of a grab ring, a washer, a grab ring protection means, a grab washer, and combinations thereof.

In addition, the grab ring protection means is a ring that is in contact with the inner periphery of the connecting device at an outer part of the grab ring and has a size equal to or greater than the height of the grab ring in the height direction of the grab ring, a ring located above the grab ring and covering the top of the grab ring, and a grab ring. Characterized in that it is one of a ring located below the ring and covering the lower portion of the grab ring and a combination thereof.

Preferably, the grab washer has a shape of a ring having smooth edges at a portion in contact with the pipe, and structurally extending and deforming the inner periphery of the ring toward the center of the ring as the ring is compressed.

In the present invention of the above-described embodiments,

The grab washer is one of a straight or curved shape in which the cross section of the ring is constant, lowered or increased in height from the outside of the ring to the inside, a curved or polygonal shape in which the cross section of the ring is open or closed, and combinations thereof, on the plane of the ring The structure is preferably in the shape of a circular band or a part of the inner periphery in the shape of a protrusion along the inner periphery.

In addition, in the invention of the above-described embodiment,

It is preferable that at least one or more of the grab ring or grab ring protective means include a polymer material.

In addition, in the present invention of the above-described embodiments,

The sealing means should be made of a polymer material that adheres to the outer periphery of the pipe and seals between the pipe and the connecting device when compressed.

In addition, in the present invention of the above-described embodiments,

It is preferable that the lower boss portion includes a tapered structure of a lower light beam in which an inner diameter of the boss portion becomes narrower as the inner circumferential surface of the boss portion goes up from the bottom to the top.

In addition, in the above-described first embodiment of the invention, The conventional coupling method is preferably at least one of screw coupling, pin coupling, fitting, and welding between the lower boss portion and the lower end of the flare nut.

In addition, in the above-described first embodiment of the invention, it is preferable that at least one or more of the flare nut and the lower boss is made of a metal or polymer material.

Also, in the second or third embodiment of the invention,

At least one of the flare nut and the lower boss is made of a metal or a polymer material, and when the flare nut is made of a metal, at least one of between the stop of the flare nut and the pipe and between the stop of the flare nut and the valve It is preferable to further include a sealing means made of a polymer material.

According to the valve and piping connecting device according to the present invention (a generic term for parts used in the present invention such as flare nuts, bosses, and internal parts), the following effects are shown, thereby dramatically solving problems with existing technologies has the effect of solving and improving.

First, it is possible to prevent galvanic corrosion that occurs when joining dissimilar materials by blocking direct contact between the valve and the pipe. In particular, it is possible to prevent pipe damage and refrigerant leakage due to galvanic corrosion between the valve and the pipe that occurs when the resin coating of the pipe is peeled off during pipe connection.

Second, since the space between the valve and the pipe is blocked from the outside by the connecting device, the inflow of external substances that cause corrosion, such as moisture, air, and dust, can be blocked to increase durability.

Third, by minimizing the accessories of the connecting device and simplifying the internal structure of the connecting device, it is possible to prevent malfunction before and after connecting the valve-connecting device-piping, and it is not damaged even when excessive force is applied through an appropriate design for the part to which pressure is applied. It can maintain unmatched rigidity.

Fourth, as a structure that facilitates disassembly and coupling of valves, effort and cost required for installation, maintenance, and repair can be reduced, and anyone can easily operate them.

1 is a cross-sectional view of a joint-connected state of a connecting device according to a preferred embodiment of the present specification;
Figure 2 is an exploded perspective view of the connection device specified in Figure 1;
Figure 3 is a cross-sectional view of a joint-connected state of the connecting device according to another embodiment of the present specification;
Figure 4 is an exploded perspective view of the connection device specified in Figure 2;
5 is a cross-sectional view of a joint-connected state of a connecting device according to another embodiment of the present specification;
6 is an example of a grab ring for securing insulation between a flare nut and a pipe in the present invention;
7 is an example of various protective means for protecting the fixing means in the present invention;
Figure 8a is a cross-sectional view of a state in which the connection device equipped with various shapes of grab washers in the present invention is jointed;
Figure 8b is a planar structural view of the grab washer of Figure 8a;
9 is a cross-sectional view of a state in which a connecting device in which various shapes of stop jaws are implemented in a preferred embodiment of the present specification is jointly connected;
10 is a cross-sectional view of a joint-connected state in which various stop jaws are implemented in another embodiment of the present specification;
11 is a cross-sectional view of a state in which a connecting device in which a polymer sealing means is implemented is jointed in another embodiment of the present specification;
12 is various examples of the lower boss part in the present invention.

The present invention relates to a device for connecting a valve and a pipe, and among the existing prior art, prior art related to the present invention includes Korean Registered Patent No. 10-1171692 and improved Korean Utility Model Publication No. 20-2019-0004898 (registered for non-payment of registration fee) waiver), etc.

Compared to the prior art Korean Utility Model Publication No. 20-2019-0004898, the improvements and advantages of the present invention are as follows.

First, in the prior art, parts serving as a main body other than internal parts are largely composed of three parts: a flare nut, a sleeve, and a boss part, but in the present invention, the flare nut and the boss part (see FIGS. 1, 3, and 5) , the sleeve is omitted, and the number of other parts is reduced, reducing the risk of malfunction and reducing costs.

In addition, in the present invention, the material of the upper boss (see FIG. 1) is preferably a polymer material to reduce the number of parts, but a metal material may also be used. When polymeric materials are used, the O-ring can be omitted as the boss plays the role of the O-ring for sealing the valve and nut, and the upper boss blocks electrical contact at the end of the aluminum pipe, so parts for this are omitted. It can be.

In addition, the present invention has the advantage that the insertion of the internal parts is simple when assembling the parts, and the inner circumferential surface of the lower boss part has a tapered structure of the lower beam upper part in which the inner diameter becomes narrower as it goes up from the bottom to the top of the pipe. insertion can be facilitated.

Second, the present invention includes a technology for preventing galvanic corrosion compared to the prior art. Galvanic corrosion is a phenomenon in which corrosion of metals that are relatively easily oxidized due to bonding of dissimilar materials is accelerated, and corrosion of aluminum is accelerated when copper-aluminum is in contact. In order to prevent this, it is necessary to fundamentally block the contact between the aluminum pipe and the valve, which is usually made of brass. Galvanic corrosion is mainly caused by the electrical contact between the metal exposed surface and the nut at the cut end of the resin-coated aluminum pipe, the electrical contact between the grab ring and the pipe, and the electrical contact between the pipe and the nut.

In the prior art, the edge of the grab ring fixing the pipe is sharp and inevitably penetrates the coating layer of the resin-coated aluminum pipe, resulting in electrical contact between the metal grab ring and aluminum. In addition, due to the contact between the grab ring and the metal washer, electrical contact between the metal washer and the nut also occurs.

On the other hand, in the present invention, as shown in FIG. 6 according to the detailed structure of various embodiments, in some cases, a grab ring (FIG. 6) with a polymer material attached to the outer rim of the metal grab ring, or a metal or polymer material grab ring. Optional use By doing so, it is possible to prevent galvanic corrosion by blocking electrical contact with the pipe.

In addition, as shown in FIG. 7, the present invention may prevent galvanic corrosion by adopting a washer or a grab ring protection means, which functions to prevent damage to the grab ring, as a polymer material in some cases.

In the present invention, there are a grab part (hereinafter meaning including both a grab ring and a grab ring protection means (or washer)) and a sealing means (O-ring, etc.) as internal components, and the arrangement order may vary depending on the case there is. That is, from the top, the arrangement can be changed into grab part-sealing means (one or more), sealing means (one or more)-grab part-sealing means (one or more), sealing means (one or more)-grab part.

However, the structure of the grab ring protection means (or washer) may be changed as shown in FIG. 7 to prevent breakage of the grab ring according to the arrangement order of the grab unit. That is, the grab ring protection means is a ring that is in contact with the inner periphery of the flare nut on the outer part of the grab ring and has a size greater than the height of the grab ring in the height direction of the grab ring, a ring located above the grab ring and covering the top of the grab ring, It may be any one of a ring located below and covering the lower part of the grab ring and a combination thereof. At this time, if the grab ring protective means is used in some cases made of a polymer material, electrical contact between the grab ring and the pipe can be blocked.

Third, in the present invention, in order to improve the disadvantages of the grab ring with sharp edges, the grab ring can be replaced with a ring with smooth edges in contact with the pipe as shown in FIG. 8 (hereinafter referred to as a grab washer) At this time, the fixing function of the grab washer is not to fix the pipe with a sharp edge like a grab ring, but when the grab washer is compressed, the inner periphery of the grab washer is deformed and expanded in the direction toward the center, which causes the pipe to Compressive deformation of the pipe along the circumference forms a concave groove in the circumference of the pipe. Therefore, it is the principle that this groove and the extended grab washer perform a fixing function. Since the grab washer ring with smooth edges does not destroy the resin coating layer of the aluminum pipe, it is possible to block the electrical contact of the pipe due to the existing grab ring. Also, it can be effectively used for pipes that are not coated with resin.

Another advantage of the grab washer is that, unlike typical conventional grab rings that are sharp and weak, the edges are smooth and the thickness can be thicker than the existing grab rings, so it has strong characteristics. Therefore, it is possible to integrate the three parts functions of the grab ring, the grab ring protection means, and the washer into one part, which can greatly contribute to reducing the number of parts. At this time, as the material of the grab washer, a metal or polymer material may be selectively used.

Figure 8a (a) is an embodiment of a grab washer in which the cross section of the grab washer ring on the side cross section is inclined to be lower in height from the outside of the ring to the inside, Figure 8a (b) is the cross section of the ring inside the ring An embodiment of a grab washer in a shape inclined to increase in height in the outer direction, Figure 8a (c) is an embodiment of a grab washer of a semi-elliptical shape convex upward, Figure 8a (d) is a semi-elliptic shape convex downward It is an embodiment of the grab washer of , and FIG. 8a (e) is an embodiment of an oval shape with an empty inside. Here, the planar structure of the grab washer may be a circular band shape or a part of the inner periphery may be a protrusion shape as shown in FIG. 8B. In addition, the cross section of the ring may have various shapes, such as a straight or curved shape in which the height is constant, lowered or increased from the outside of the ring to the inside, a curved or polygonal shape in which the cross section of the ring is open or closed. Therefore, as the ring is compressed, the inner periphery of the ring is structurally expanded and deformed toward the center of the ring to form a groove on the circumference of the pipe. One of the features of the present invention is the introduction of a grab washer ring with smooth edges.

Fourth, when tightening by applying excessive force in the screw fastening connection, excessive compression force is applied to the sealing means (O-ring, etc.), the grab portion, and the upper and lower boss portions, resulting in damage to the parts and leakage of refrigerant. Therefore, in the present invention, it is possible to prevent this by providing an appropriate stopping jaw.

In the case of (a) of FIG. 9, there is a protruding jaw at the lower part of the lower inner diameter of the flare nut, so that the upper boss is provided with a stopper to stop the progress in the compression direction, thereby preventing excessive force from being applied. ( Alternatively, a stopper that prevents the lower boss from moving due to a protruding jaw on the upper part of the lower inner diameter of the flare nut is also possible). In the case of (b) of FIG. 9, a stop ring made of a polymer material or metal is inserted to provide a stop function for the upper boss (or a stop ring for the lower boss). If the stop ring is made of a polymer material, it also has an additional function to block the electrical contact of the metal grab ring, so the number of parts can be reduced.

In the case of (a) of FIG. 10, there is a protruding jaw at the upper part of the lower inner diameter of the flare nut, so that the lower boss portion has a stopper to stop the progress in the compression direction, so that excessive force can be prevented. In the case of FIG. 10 (b), an example of inserting a stop ring made of a polymer material or a metal material, and in the case of FIG. . In the case of (d) of FIG. 10, the lower surface of the bottom of the flare nut serves as a protruding jaw to provide an effect of having a stopper to stop the lower boss portion from moving in the compression direction, thereby preventing excessive force from being applied. there is. In addition, it is also possible to adopt a stopper that stops the lower boss from moving in the compression direction by placing a protrusion corresponding to the lower end of the flare nut at the lower part of the lower boss, so that the lower end of the nut serves as a protruding jaw.

In addition, in the present invention, when screwing the lower boss and the flare nut body, as shown in (c) of FIG. 12, the screw or screw that stops the lower boss from moving in the compression direction by stopping the end of the screw or screw It is also possible to give the function of a stopping jaw by providing the limit line of the pier.

(Example 1)

Hereinafter, with reference to the accompanying drawings, a valve-pipe fastening method by a connecting device according to a preferred embodiment of the present specification will be described in detail. 1 and 2, in one embodiment of the present invention, a pipe 50 is connected to a valve 10 having an inclined surface 12 formed at an end and a first screw 11 formed at an outer periphery. In the piping connection device for;

The first screw hole 21 corresponding to the first screw line 11 is formed at the upper end, the first holding jaw 22 has the largest inner diameter at the upper end located on the lower surface, and the second screw hole 23 Flare nut 20 consisting of a lower end created at the end;

A second screw wire 61 corresponding to the second screw hole 23 is formed on the outer periphery, and the inner circumference becomes narrower as the inner circumferential surface goes up from the bottom to the top to facilitate pipe insertion. lower boss portion 60 (as an example, which can be brass or polymeric material);

A compression part 34 for compressing the sealing means 41a located on the inner diameter of the bottom of the flare nut 20, a stop part 32 for stopping the insertion of the end of the pipe, and a certain length to the end of the valve, fastening progress According to the valve, it is provided with a support part 31 that serves as a support in contact with the valve, and a first seating jaw 33 corresponding to the first holding jaw 22 is formed, and the valve 10 and the pipe 50 an upper boss portion 30 made of an insulating polymer material for the purpose of blocking direct contact and compressing the sealing means (for example, it may be synthetic resin, plastic or Teflon);

One or more sealing means 41a made of insulating polymer material located below the upper boss so that it is located on the inner diameter of the bottom of the flare nut 20 and can be sealed in close contact with the outer diameter of the pipe 50 (as an example , an O-ring may be used) ;

It is located in the inner diameter of the lower end of the flare nut 20, is in close contact with the outer diameter of the pipe 50, and prevents the pipe 50 from coming off after coupling the flare nut 20 and the pipe 50 Fixing means 43;

Located on the inner diameter of the lower end of the flare nut 20, a protective means 42 for the purpose of preventing damage to the fixing means 43 in the process of coupling the flare nut 20 and the valve 10; It is characterized by providing.

For this reason, the above-described flare nut 20 is provided with an upper boss portion 30, a sealing means 41a, a protection means 42, a fixing means 43, and a lower boss portion 60, and the coupling of the pipe The pipe 50 passes through the lower boss part 60, the fixing means 43, the protecting means 42, the sealing means 41a, and the upper boss part 30 in order, and finally adheres to the stopping part 32. It consists of inserting until it becomes.

At this time, the fixing means 43 acts to prevent the pipe 50 from coming off, but in this process, the flare nut 20 and the pipe through contact between the pipe 50 and the metal fixing means 43 Electrical contact between (50) may occur and galvanic corrosion may occur.

Therefore, to prevent direct contact between the fixing means 43 and the flare nut 20 in order to solve this problem, the fixing means protecting means surrounds the outer periphery of the fixing means 43, up, down, or a combination thereof. Insulation between the fixing means 43 - the flare nut 20 - the pipe 50 can be secured by selecting the structure and the material as the insulating material. At this time, the height of the protection means may be higher than that of the fixing means 43 to prevent damage to the fixing means 43 .

Thereafter, the valve 10 is screwed through the first screw line 11 and the first screw hole 21, and the sealing means 41a is elastically deformed as the fastening progresses, so that the pipe 50 The gap between the outer periphery and the inner periphery of the connecting device 20 is sealed, thereby preventing the refrigerant from leaking out, and preventing foreign substances such as moisture, air, and dust from entering from the outside. .

In addition, the support 31 of the upper boss, which is made of a polymer material, contacts and compresses the valve inclined surface 12 during fastening of the nut and the valve, thereby sealing the gap between the outer periphery of the valve 10 and the inner periphery of the flare nut 20. It can prevent the leakage of refrigerant and contribute to the reduction of the number of parts. In addition, the stopper 32 of the upper boss, which is made of a polymer material, blocks electrical contact with the metal pipe exposed to the end surface of the pipe, thereby contributing to a reduction in the number of parts.

In addition, in the first embodiment, the order of the sealing means 41a, the fixing means 43, and the protecting means 42 located at the lower end of the flare nut 20 may be different as described above depending on the case. . However, the structure of the protective means 42 may be changed as shown in FIG. 7 to prevent damage to the fixing means 43 according to the arrangement order of the fixing means 43 .

In addition, in the first embodiment, the fixing means 43 may be replaced with a ring-shaped grab washer 44 having a smooth edge at a portion in contact with the pipe, and as described above with FIG. 8, various shapes can be applied. can The advantages of the grab washer 44 are as described above.

In addition, in the present invention, as described above, a stopper for stopping the progress of the upper boss portion 30 may be further provided to prevent damage to internal components (see FIG. 9).

In the case of Example 1, the lower boss portion 60 is preferably a detachable type in order to insert internal parts (grab portion, O-ring, etc.) when assembling the connecting device, and after inserting the internal parts, the lower boss portion 60 is coupled to the nut body. This is a part that requires no further manipulation. As shown in FIG. 12 , variously modified shapes of the lower boss portion 60 may be applied. In addition, the lower boss portion 60 may be coupled to the lower end of the flare nut 20 by at least one of screw coupling, pin coupling, fitting, and welding. Therefore, in the present invention, since the lower boss portion 60 is already fixed when the connecting device is manufactured, when connecting the valve 10 and the pipe 50, the pipe 50 is tightened once the flare nut 20 is tightened after inserting the pipe There is a convenient feature that the connection of is completed.

(Example 2)

Referring to FIGS. 3 and 4, another embodiment of the present invention is a pipe 50 for an outdoor unit in a valve 10 having an inclined surface 12 formed at an end thereof and a first threaded wire 11 formed at an outer periphery thereof. ) In the pipe connecting device for connecting the joints;

The top of the flare nut 20 where the first screw hole 21 corresponding to the first screw line 11 is formed, has the smallest inner diameter, and has a support portion 24 that contacts the valve 10 as the fastening progresses and serves as a support ), a stop portion 25 for stopping the insertion of the end of the pipe 50, a stop portion of the flare nut 20 having a compression portion 26 for compressing the sealing means 41a on the inner diameter, and a lower boss portion 60 A flare nut 20 made of a lower end of the flare nut 20 having a second screw hole 23 corresponding to the second screw line 61 of the;

a fixing means (43) located on the inner diameter of the lower end of the flare nut (20) and closely adhering to the outer diameter of the pipe (50) to prevent the pipe from being separated;

One or more sealing means 41a made of an insulating polymer material (for example, an O-ring may be used has exist) ;

It is located on the inner diameter of the bottom of the flare nut 20, and the purpose is to prevent the sealing means 41a from being damaged by the sharp surface of the fixing means 43, and the fixing means 43 and the sealing means 41a ) A protective means (42) located between;

It is located on the inner diameter of the bottom of the flare nut 20, and prevents the fixing means 43, the protection means 42, and the sealing means 41a from escaping from the inside of the flare nut 20, and the pipe 50 and In order to facilitate the insertion of the pipe 50 when the flare nut 20 is coupled, the inner circumferential surface is characterized in that it includes a tapered structure of the lower beam upper jaw, in which the inner diameter becomes narrower as the inner circumferential surface goes up from the bottom to the top, and the fixing means (43 ), a protective means 42, and a lower boss portion 60 (as an example, which may be brass or Teflon) located below the sealing means 41a.

For this reason, the above-mentioned flare nut 20 is provided with a fixing means 43, a protecting means 42, a sealing means 41a and a lower boss part 60, and the coupling process of the pipes is the same as in Example 1. In addition, the working principle of the fixing means 43, the sealing means 41a and the protecting means 42 is the same as in the first embodiment.

However, the difference from Example 1 is that the lower boss portion 60 moves in the compression direction by fastening the screw to compress the sealing means 41a. At this time, when the lower boss part 60 is fastened with an excessive compressive force during the pipe installation work, there is a risk that internal parts may be damaged. Therefore, it is possible to prevent this by providing a stopper 27 of the lower boss part at the lower end of the nut. Various modifications of the stop jaw in Example 2 are shown in FIG. 10 .

In addition, in the present embodiment 2, the order of the sealing means 41a, the fixing means 43, and the protection means 42 may be different depending on the case as in the first embodiment.

In addition, in the second embodiment, the grab washer 44 may be introduced as in the first embodiment.

On the other hand, the flare nut 20 and the lower boss portion 60 may be made of a metal or polymer material, and when the flare nut 20 is made of a metal material, since the end of the pipe 50 is metal, the flare nut 20 ) Insulation of a polymer material is further provided between the middle stop portion 25 and the pipe, and between the flare nut 20, the middle stop portion 25 and the valve 20, polymer is used to ensure airtightness between the valve and the nut. It is preferable to further include a sealing means made of a material. (See Fig. 11)

In addition, the shape of the lower boss portion may have various modifications, and various modifications are illustrated in FIG. 12 .

(Example 3)

Referring to FIG. 5, in the method of fastening the valve 10 to the pipe 50 by the connection device according to another embodiment (third embodiment) of the present specification, an inclined surface 12 is formed at the end, and the outer periphery A pipe connecting device for jointly connecting a pipe (50) for an outdoor unit to a valve (10) in which a first thread (11) is formed;

a flare nut 20 having the same structure as Example 2;

A fixing means (43) located at the lower inner diameter of the flare nut and, unlike Examples 1 and 2, the grab part (grab ring and grab protection means) is replaced with a grab washer (44);

As the grab washer 44 is used, the stopper 27 and the protective means 42 can be omitted, and other lower boss parts 60 and internal accessories are the same as in Example 2; characterized by

Therefore, as the grab ring is replaced by the grab washer 44, the advantages of using the grab washer 44 in the fixing means 43 have the same effect as described above.

In addition, features other than using the grab washer 44 are the same as in Example 2.

Here, although the above specification has been described with reference to preferred embodiments, those skilled in the art will variously modify and modify this specification within the scope not departing from the spirit and scope of the present specification described in the claims below. You will understand that you can change.

10: valve
11: 1st screw wire
12: valve slope
20 : flare nut
21: first screw hole
22: 1st stumbling jaw
23: 2nd screw hole
24: support
25: stop
26: compression unit
27 : stop jaw
30: upper boss part
31: support
32: stop
33: first seating jaw
34: compression unit
41a, 41b: sealing means
42: protection
43: fixing means
44 : Grab Washer
45: Insulation protection ring of metal grab ring
50: piping
60: lower boss part
61: 2nd screw wire

Claims (19)

In the pipe connection device for connecting the pipe to the valve;
A flare nut consisting of an upper end and a lower end having a larger inner diameter than the upper end, and the upper end and the lower end being divided into first locking jaws;
At the upper end of the flare nut, a first screw hole corresponding to the first screw of the valve is formed on the inner periphery, and the upper end of the flare nut is fastened to the valve through screwing; sealing means;
Fixing means for fixing the pipe to the inner diameter portion of the bottom of the flare nut;
A protective means for preventing damage to the fixing means on the inner diameter of the lower end of the flare nut;
an upper boss portion positioned over a lower portion of the upper inner diameter of the flare nut and an upper portion of the lower inner diameter of the flare nut, and located above the sealing means, the fixing means, and the protecting means;
The upper boss part has a compression part for compressing the sealing means, a stop part for stopping the insertion of the end of the pipe, a support part that has a certain length up to the end of the valve, and contacts the valve according to the progress of the fastening and serves as a support, and the first locking jaw An upper boss having a first seating step corresponding to and being made of a polymer material;
It is located in the inner diameter of the lower end of the flare nut, the outer periphery corresponds to the inner diameter of the lower end of the flare nut, the inner periphery corresponds to the outer diameter of the pipe, is located below the fixing means, the protecting means, and the sealing means, and is a normal coupling a lower boss portion fixed to the lower end of the flare nut by means; Including,
The fixing means and the protecting means block the electrical contact between the pipe and the flare nut, and the electrical contact between the connecting device and the pipe is fundamentally blocked. connection device.
In the pipe connection device for connecting the pipe to the valve;
A flare nut consisting of an upper end, a middle end having the smallest inner diameter, and a lower end;
an upper end of the flare nut in which a first screw hole corresponding to the first screw of the valve is formed on the inner periphery of the upper end of the flare nut and is fastened to the valve through screw coupling;
In the middle of the flare nut, a compression part for compressing the sealing means to the inner diameter of the middle of the flare nut, a stop part for stopping the insertion of the end of the pipe, and a certain length to the end of the valve. Flare nut stop having a support for doing;
one or more sealing means for sealing the refrigerant to the inner diameter of the lower end of the flare nut;
Fixing means for fixing the pipe to the inner diameter portion of the bottom of the flare nut;
A protective means for preventing damage to the fixing means on the inner diameter of the lower end of the flare nut;
It is located in the inner diameter of the lower end of the flare nut, the outer periphery corresponds to the inner diameter of the lower end of the flare nut, the inner periphery corresponds to the outer diameter of the pipe, and is located under the fixing means, the protecting means, and the sealing means, in the screw coupling A lower boss portion fixed to the lower end of the flare nut by;
A stopper where the lower boss portion progresses in the compression direction and then stops progressing;
The fixing means and the protecting means block the electrical contact between the pipe and the flare nut, and the electrical contact between the connecting device and the pipe is fundamentally blocked. connection device.
In the pipe connection device for connecting the pipe to the valve;
A flare nut consisting of an upper end, a middle end having the smallest inner diameter, and a lower end;
a flare nut having a first screw hole corresponding to the first screw line of the valve formed on the inner periphery of the upper end of the flare nut and fastened to the valve through screw coupling;
In the middle of the flare nut, a compression part for compressing the sealing means to the inner diameter of the middle of the flare nut, a stop part for stopping the insertion of the end of the pipe, and a certain length to the end of the valve. Flare nut stop having a support for doing;
one or more sealing means for sealing the refrigerant to the inner diameter of the lower end of the flare nut;
A fixing means using a grab washer made of metal or polymer material for fixing the pipe to the inner diameter portion of the lower end of the flare nut;
It is located in the inner diameter of the lower end of the flare nut, the outer periphery corresponds to the inner diameter of the lower end of the flare, the inner periphery corresponds to the outer diameter of the pipe, and is located below the fixing means, the protecting means, and the sealing means, by screw coupling A lower boss portion fixed to the bottom of the flare nut;
The fixing means blocks the electrical contact between the pipe and the flare nut, and the connection between the valve and the pipe for preventing corrosion and welding-free connection of dissimilar materials, characterized in that the electrical contact between the connecting device and the pipe is fundamentally blocked .
According to claim 1,
There is a protruding jaw at the lower part of the lower inner diameter of the flare nut to stop the upper boss from moving in the compression direction, and a protruding jaw at the upper part of the bottom of the flare nut to stop the lower boss from moving in the compression direction. By stopping the end of the screw or screw hole at the bottom of the lower boss and the flare nut, further comprising one of the limit line of the screw or screw hole and a combination thereof to stop the lower boss from moving in the compression direction. Characterized in that Valve and pipe connection device for corrosion prevention and welding-free connection of dissimilar materials.
According to claim 3,
The valve and pipe connection device for preventing corrosion and welding-free connection of dissimilar materials, characterized in that the lower boss portion has a stopper that stops the progress while proceeding in the compression direction.
According to claim 2 or 5,
The stopping jaw that stops the progress has a protruding jaw on the upper part of the inner diameter at the bottom of the flare nut to stop the lower boss from moving in the compression direction, and is located on the outer diameter at the bottom of the flare nut and protrudes to make the lower boss move in the compression direction stop jaw, the lower boss part and the bottom end of the screw line or screw hole at the bottom of the flare nut, the limit line of the screw line or screw hole that stops the lower boss part from progressing in the compression direction, the lower boss part at the bottom end of the flare nut Through the structure surrounding the part, the lower end of the flare nut acts as a protruding jaw to stop the lower boss from moving in the compression direction. A valve and pipe connection device for corrosion prevention and weldingless connection of dissimilar materials, characterized in that the lower end acts as a protruding jaw and is one of a stopper and a combination thereof to stop the lower boss portion from moving in the compression direction.
The method of any one of claims 2, 4 and 5,
The stopping jaw may be a flare nut and a separable type, and in the case of a separable type, a valve and pipe connection device for preventing corrosion and welding-free connection of dissimilar materials, characterized in that the ring-shaped metal or polymer material.
According to claim 1 or 2,
The fixing means is a grab ring, a washer, a grab ring protection means, a grab washer, and a combination thereof. Valves and piping for corrosion prevention and weldingless connection of dissimilar materials, characterized in that connecting device.
According to claim 8,
The grab ring protecting means includes a ring that is in contact with the inner circumference of the connecting device at an outer portion of the grab ring and has a size equal to or greater than the height of the grab ring in the height direction of the grab ring, a ring located above the grab ring and covering the top of the grab ring, Valve and pipe connection device for corrosion prevention and weldingless connection of dissimilar materials, characterized in that it is one of a ring and a combination thereof located below the grab ring and covering the lower part of the grab ring.
According to claim 3,
The grab washer is in the shape of a ring with smooth edges at the part in contact with the pipe, and as the ring constituting the grab washer is compressed, the inner periphery of the ring is structurally expanded and deformed toward the center of the ring to form a groove on the outer periphery of the pipe Valve and pipe connection device for corrosion prevention and weldingless connection of dissimilar materials, characterized in that the shape.
According to claim 8,
The grab washer is in the shape of a ring with smooth edges at the part in contact with the pipe, and as the ring constituting the grab washer is compressed, the inner periphery of the ring is structurally expanded and deformed toward the center of the ring to form a groove on the outer periphery of the pipe Valve and pipe connection device for corrosion prevention and weldingless connection of dissimilar materials, characterized in that the shape.
According to claim 10,
The grab washer is one of a straight or curved shape in which the cross section of the ring is constant, lowered or increased in height from the outside of the ring to the inside, a curved or polygonal shape in which the cross section of the ring is open or closed, and combinations thereof, and a plane of the ring The phase structure is a valve and pipe connection device for corrosion prevention and weldingless connection of dissimilar materials, characterized in that a circular band shape or a part of the inner periphery is in the shape of a protrusion along the inner periphery.
According to claim 11,
The grab washer is one of a straight or curved shape in which the cross section of the ring is constant, lowered or increased in height from the outside of the ring to the inside, a curved or polygonal shape in which the cross section of the ring is open or closed, and combinations thereof, and a plane of the ring A valve and pipe connection device for corrosion prevention and weldingless connection of dissimilar materials, characterized in that the circular band shape or the shape of a protrusion along the inner periphery at a partial depth of the inner periphery.
According to claim 8,
At least one of the grab ring or the grab ring protection means comprises a polymer material, a valve and pipe connection device for preventing corrosion and welding-free connection of dissimilar materials.
According to any one of claims 1, 2 and 3,
The sealing means is a valve and pipe connection device for preventing corrosion and welding-free connection of dissimilar materials, characterized in that the polymer material is in close contact with the outer periphery of the pipe when compressed and seals between the pipe and the connection device.
According to any one of claims 1, 2 and 3,
The lower boss portion includes a tapered structure of the lower beam upper limit in which the inner diameter narrows as the inner periphery of the boss portion goes up from the bottom to the top.
According to claim 1,
The conventional coupling method is at least one of screw coupling, pin coupling, fitting, and welding between the lower boss portion and the lower end of the flare nut. Valve for corrosion prevention and weldless connection of dissimilar materials, characterized in that and piping connectors.
According to claim 1,
At least one of the flare nut and the lower boss portion is a metal or polymer material, a valve and pipe connection device for preventing corrosion and welding-free connection of dissimilar materials.
According to claim 2 or 3,
At least one of the flare nut and the lower boss portion is made of a metal or polymer material, and when the flare nut is made of a metal material, at least between the stop portion of the flare nut stop and the pipe and between the stop portion of the flare nut stop and the valve A valve and pipe connection device for preventing corrosion and welding-free connection of dissimilar materials, characterized in that at least one sealing means of polymer material is further provided.

Images