Non-welding joint device

Abstract

A non-welding joint device according to the present invention may comprise: a nut member; a first ferrule member positioned inside the nut member; a second ferrule member positioned inside the nut member and provided on one side of the first ferrule member; and a triple contact connection member positioned inside the nut member and on one side, opposite to the first ferrule member, of the second ferrule member.

Description

Weldless joint device

[0001] The present invention relates to a weld-free joint device, and more particularly, to a weld-free joint device that can connect a refrigerant pipe and a service valve without the need to process an expansion portion at the end of the refrigerant pipe connected to the service valve, and can also be used to connect two pipes without a separate processing operation.

[0002] A service valve is a type of valve that is installed and connected to the refrigerant circulation line (refrigerant pipe) of an air conditioning system to supplement or supply refrigerant circulating in air conditioning devices such as air conditioners or refrigerators.

[0003] Fig. 1 is a partial cross-sectional view of a conventional service valve for an air conditioner, and Fig. 2 is a detailed perspective view of a conventional indoor unit-side refrigerant pipe connection. As illustrated, the service valve is composed of a first branch pipe (10) to which a refrigerant pipe (14) extending from the indoor unit side is connected, a second branch pipe (20) to which a refrigerant pipe (21) connected to a device such as a pump is connected, a third branch pipe (30) in which a valve core, which is a type of check valve for injecting refrigerant, is installed, and a fourth branch pipe (40) in which a spindle valve for switching the flow path of the refrigerant is installed. In Fig. 1, unexplained reference numeral 31 represents a core cap, and 41 represents a nut cap.

[0004] A screw portion (11) is formed on the outer surface of the first branch pipe (10), and a nut (13) with a refrigerant pipe (14) inserted therein is joined. At this time, as shown in the drawing, the refrigerant pipe was connected to the service valve by forming an inclined surface (12) at the inlet end of the first branch pipe (10) and then expanding the end of the refrigerant pipe (14) to correspond to the inclined surface (12). That is, the mainstream method was to expand the end of the refrigerant pipe (14) into a funnel shape or a truncated cone shape as shown, and then use a nut (12) to join the inner surface of the expanded pipe portion (14a) so that it is in close contact with the outer surface of the inclined surface (12). However, this expansion method requires expensive expansion equipment, so the cost is very high, and it has always been pointed out that it is difficult to quickly respond to changes in the specifications of the refrigerant pipe. In addition, it is true that the problem of being unable to expand the end of the refrigerant pipe when replacing, connecting, or repairing the refrigerant pipe to the service valve on site has been pointed out as very inconvenient. Moreover, a more serious problem in the conventional service valve is that the refrigerant frequently leaks at the contact point between the expansion portion (14a) of the refrigerant pipe (14) and the inclined surface (12) of the first branch pipe (10). Therefore, there has been the inconvenience of having to replenish the refrigerant by reinjecting it after a certain period of use or when moving or reinstalling the air conditioner, etc.

[0005] Therefore, there is a growing demand for joint devices that can easily, conveniently, and quickly connect refrigerant pipes to service valves. Furthermore, there is a growing need for versatile or compatible universal joints that can be used not only for connecting service valves and refrigerant pipes, but also for connecting general piping.

[0006] The applicant proposed the present invention to solve the above problems.

[0007] Related prior art includes Korean Patent No. 10-1153412 (Title of invention: Service valve for air conditioner, Registration date: May 30, 2012).

[0008] The present invention has been devised to solve the above problems, and provides a non-welding joint device that can connect a refrigerant pipe and a service valve without forming an expansion portion at the end of the refrigerant pipe.

[0009] The present invention provides a non-welding joint device capable of connecting pipes by being connected to the pipes through plastic compression.

[0010] The present invention provides a weld-less joint device that does not require separate processing work when connecting two pipes.

[0011] The present invention provides a non-welding joint device that can be universally used for connecting a refrigerant pipe and a service valve, and for connecting two pipes.

[0012] The problems to be solved by the present invention are not limited to the problem(s) mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0013] A non-welding joint device according to the present invention for achieving the above-described task may include: a nut member; a first ferrule member positioned inside the nut member; a second ferrule member positioned inside the nut member and provided on one side of the first ferrule member; and a triple contact connecting member positioned inside the nut member and positioned on one side of the second ferrule member facing the first ferrule member.

[0014] A service valve may be connected to one side of the triple contact connecting member facing the second ferrule member.

[0015] It may include a gasket member positioned on one side of the triple contact connection member facing the second ferrule member.

[0016] It may include a pipe connecting member positioned on one side of the triple contact connecting member facing the second ferrule member.

[0017] The above pipe connecting member may include a fitting part located inside the nut member, one end of which is in contact with the triple contact connecting member and has a male thread formed on an outer surface; and a spacer part formed on an outer surface of the fitting part and in contact with the nut member.

[0018] The above fitting portion is formed on both sides of the spacer portion, and a tapered portion may be formed on one end of the above fitting portion.

[0019] The above tapered portion may be arranged to contact the above triple contact connecting member.

[0020] It may include a gasket member positioned between the above triple contact connecting member and the above pipe connecting member.

[0021] The outer surface of the triple contact connecting member is formed in a cylindrical or cylindrical shape, and four center holes of different sizes or shapes can be formed inside the triple contact connecting member.

[0022] The four center holes formed inside the triple contact connecting member may include a first center hole in which the second ferrule member is positioned; a second center hole connected to the first center hole and in which a pipe is positioned; a third center hole connected to the second center hole and having a smaller size than the second center hole; and a fourth center hole connected to the third center hole and in which the gasket member, the service valve, or the pipe connecting member is positioned.

[0023] The first center hole may be provided in a form in which the inner diameter thereof is continuously reduced from one end of the triple contact connecting member toward the second center hole, the second center hole and the third center hole may be provided in a cylindrical shape, and the fourth center hole may be provided in a form in which the inner diameter thereof is continuously reduced from the other end of the triple contact connecting member toward the third center hole.

[0024] The smallest inner diameter among the inner diameters of the first center hole may be larger than the inner diameter of the second center hole, the inner diameter of the second center hole may be larger than the inner diameter of the third center hole, and the smallest inner diameter among the inner diameters of the fourth center hole may be provided to be the same as the inner diameter of the third center hole.

[0025] One end of the second ferrule member may be pressed into the first step formed at the point where the first center hole and the second center hole are connected, and one end of the pipe may be pressed into the second step formed at the point where the second center hole and the third center hole are connected.

[0026] The angle formed by the straight line passing through the center of the triple contact connecting member and the inclined surface of the first center hole may be formed to be smaller than the angle formed by the inclined surface of the fourth center hole.

[0027] The outer surface of the second ferrule member may be pressed onto the inner surface of the first center hole, and the outer surface of the service valve or the pipe connection member or the gasket member may be pressed onto the inner surface of the fourth center hole.

[0028] Specific details of other embodiments are included in the detailed description and accompanying drawings.

[0029] The non-welding joint device according to the present invention can connect a refrigerant pipe and a service valve of an air conditioner or air conditioning system without forming an expansion portion at the end of the refrigerant pipe when connecting the refrigerant pipe and the service valve, thereby reducing the inconvenience of having to form an expansion portion at the end of the refrigerant pipe, and reliably preventing refrigerant gas from leaking through the expansion portion formed at the end of the refrigerant pipe.

[0030] Since the non-welding joint device according to the present invention can be used for general pipe connection, such as directly connecting refrigerant pipes to refrigerant pipes, in addition to connecting refrigerant pipes and service valves, it can be used for various connection points with one device.

[0031] The non-welding joint device according to the present invention can improve sealing performance because it can be connected not only directly to a pipe or a service valve, but also to a pipe or the like while a gasket member is fitted to the pipe or service valve.

[0032] The non-welding joint device according to the present invention can further improve the sealing performance by having a triple contact connecting member in which the end of the pipe is pressed in addition to the first and second ferrule members plastically pressing the outer surface of the pipe.

[0033] The non-welding joint device according to the present invention does not require machining of the ends of pipes to connect two pipes.

[0034] Fig. 1 is a perspective view showing a partial cross-section of a conventional service valve for an air conditioner.

[0035] FIG. 2 is a perspective view illustrating a weldless joint device according to a first embodiment of the present invention.

[0036] Fig. 3 is a cross-sectional view of a weldless joint device according to Fig. 2.

[0037] Figure 4 is an enlarged cross-sectional view of part A of Figure 2.

[0038] FIGS. 5a and 5b are perspective views and cross-sectional views illustrating a modified example of a weldless joint device according to the first embodiment of the present invention.

[0039] FIG. 6 is a perspective view illustrating a non-welding joint device according to a second embodiment of the present invention.

[0040] Fig. 7 is a cross-sectional view illustrating a weldless joint device according to Fig. 6.

[0041] Fig. 8 is an exploded perspective view showing a state in which pipes are connected to each side of the joint device according to Fig. 6.

[0042] Fig. 9 is a cross-sectional view of the joint device and piping shown in Fig. 8.

[0043] FIG. 10a and FIG. 10b are perspective views showing a state in which pipes are connected to both sides of a joint device according to FIG. 6, and cross-sectional views showing a state in which the joint device and the pipes are connected.

[0044] FIGS. 11a and 11b are perspective views and cross-sectional views illustrating a modified example of a weldless joint device according to a second embodiment of the present invention.

[0045] Fig. 12 is an exploded perspective view showing a state in which pipes are connected to each side of the joint device according to Figs. 11a and 11b.

[0046] Fig. 13 is a cross-sectional view of the joint device and piping shown in Fig. 12.

[0047] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components will be given identical or similar drawing reference numerals, and redundant descriptions thereof will be omitted. The suffix "part" used for components in the following description is assigned or used interchangeably only for the convenience of writing the specification, and does not in itself have a distinct meaning or role. In addition, when describing the embodiments disclosed in this specification, if it is determined that a specific description of a related known technology may obscure the gist of the embodiments disclosed in this specification, a detailed description thereof will be omitted. In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

[0048] Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another.

[0049] When it is said that a component is "connected" to another component, it should be understood that it may be directly connected to that other component, but there may also be other components in between.

[0050] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0051] In this application, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0052] Please note that the drawings are schematic and not drawn to scale. The relative dimensions and proportions of parts in the drawings may be exaggerated or reduced for clarity and convenience, and any dimensions are for illustrative purposes only and are not limiting. In addition, identical structures, elements, or components appearing in more than one drawing are designated by the same reference numerals to indicate similar features.

[0053] The embodiments of the present invention specifically illustrate ideal embodiments of the present invention. Consequently, various modifications to the drawings are anticipated. Therefore, the embodiments are not limited to the specific form of the illustrated area, and include, for example, modifications resulting from manufacturing processes.

[0054]

[0055] FIG. 2 is a perspective view showing a weldless joint device according to a first embodiment of the present invention, FIG. 3 is a cross-sectional view of the weldless joint device according to FIG. 2, FIG. 4 is an enlarged cross-sectional view of part A of FIG. 2, FIGS. 5a and 5b are a perspective view and a cross-sectional view showing a modified example of the weldless joint device according to the first embodiment of the present invention, FIG. 6 is a perspective view showing a weldless joint device according to a second embodiment of the present invention, FIG. 7 is a cross-sectional view showing the weldless joint device according to FIG. 6, FIG. 8 is an exploded perspective view showing a state in which pipes are respectively connected to both sides of the joint device according to FIG. 6, FIG. 9 is a cross-sectional view of the joint device and the pipe shown in FIG. 8, FIGS. 10a and 10b are perspective views showing a state in which pipes are connected to both sides of the joint device according to FIG. 6 and a cross-sectional view showing a state in which the joint device and the pipe are connected, FIGS. 11a and 11b are perspective views showing a modified example of the weldless joint device according to the second embodiment of the present invention, and Cross-sectional view, Fig. 12 is an exploded perspective view showing a state in which pipes are connected to each side of the joint device according to Figs. 11a and 11b, and Fig. 13 is a cross-sectional view of the joint device and pipes shown in Fig. 12.

[0056]

[0057] Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings.

[0058] A weldless joint device (100) according to a first embodiment of the present invention illustrated in FIGS. 2 to 5A and 5B may include a nut member (170); a first ferrule member (150) positioned inside the nut member (170); a second ferrule member (130) positioned inside the nut member (170) and provided on one side of the first ferrule member (150); and a triple contact connecting member (110) positioned inside the nut member (170) and positioned on one side of the second ferrule member (130) facing the first ferrule member (150).

[0059] Referring to FIGS. 2 to 4, a service valve (210) may be connected to a non-welding joint device (100) according to the first embodiment of the present invention. That is, a service valve (210) may be connected to one side of a triple contact connecting member (110) facing the second ferrule member (130).

[0060] A weldless joint device (100) according to a first embodiment of the present invention is configured such that a nut member (170) is screw-connected to a service valve (210), and a first ferrule member (150), a second ferrule member (130), and a triple contact connection member (110) located inside the service valve (210) and the screw-connected nut member (170) press the outer surface and end of the pipe, thereby plastically pressing the outer surface and end of the pipe with the first ferrule member (150), the second ferrule member (130), and the triple contact connection member (110), thereby bringing the pipe and the service valve (210) into surface contact, thereby connecting the pipe and the service valve (210) in a completely airtight state. In this way, the non-welding joint device (100) according to the first embodiment of the present invention can connect a pipe and a service valve or a pipe and a pipe in a completely airtight state without welding by having the first ferrule member (150), the second ferrule member (130), and the triple contact connection member (110) come into surface contact with the outer surface of the pipe and plastically compress it, and the triple contact connection member (110) come into surface contact with the service valve (210) or the pipe connection member (310) described below and plastically compress it.

[0061] Referring to FIGS. 3 and 4, the nut member (170) of the weldless joint device (100) according to the first embodiment of the present invention may include a cylindrical member (171) having a through hole (175) formed therein. An extension portion (172) may be formed at one end of the cylindrical member (171) in the longitudinal direction or in the insertion direction (direction of arrow B in FIG. 3) of the pipe (see 90 in FIG. 8). A female screw portion (173) may be formed at one end of the inner surface of the cylindrical member facing the extension portion (172). One end of the pipe to be connected is inserted into the through hole (175) of the nut member (170), and one end of the pipe passes through the through hole (175) and the first ferrule member (150) and the second ferrule member (130), and then one end comes into contact with the triple contact connecting member (110).

[0062] The first ferrule member (150) may include a flange portion (151) that contacts the inner surface of the nut member (170) and a connecting portion (152) that extends from one end of the flange portion (151) toward the second ferrule member (130). A through hole (155) that communicates with the through hole (175) may be formed inside the first ferrule member (150). Here, the size (inner diameter) of the inner surface (156) of the through hole (155) is preferably the same as the outer diameter of the pipe into which it is inserted or slightly smaller than the outer diameter of the pipe.

[0063] A taper portion (153) in the shape of a chamfer may be formed at the front end of the flange portion (152) that comes into contact with the second ferrule member (130) along the insertion direction of the pipe (refer to the direction of arrow B).

[0064] A second ferrule member (130) may be positioned in front of a first ferrule member (150) along the insertion direction of the pipe. The second ferrule member (130) may include a body (131) having an outer surface of a conical shape (132) whose outer diameter continuously decreases along the insertion direction of the pipe, and a first through hole (135) and a second through hole (137) formed penetrating the interior of the body (131). The first through hole (135) and the second through hole (137) are connected to each other.

[0065] The first through hole (135) formed inside the second ferrule member (130) may be provided in a cone shape with an inner diameter that continuously decreases along the insertion direction of the pipe (see the direction of arrow B). On the other hand, the second through hole (137) formed inside the second ferrule member (130) may be provided in a cylindrical shape with an inner diameter of the same size.

[0066] In FIG. 4, the drawing symbol CL means a straight line (center line) passing through the centers of the first ferrule member (150), the second ferrule member (130), and the triple contact connection member (110).

[0067] Here, it is preferable that the angle between the inner surface (136) of the first through hole (135) and the center line (CL) is equal to or smaller than the angle between the taper portion (153) formed at the front end of the flange portion (152) of the first ferrule member (150) and the center line (CL). Due to this shape, when the nut member (170) is connected to the service valve (210) or the pipe connection member (310), the tapered portion (153) of the first ferrule member (150) digs into the inner surface (136) of the first through-hole (135) of the second ferrule member (130), so that the inner surface (156) of the through-hole (155) of the first ferrule member (150) presses against the outer surface of the pipe, and the outer surface (132) of the body (131) of the second ferrule member (130) can press against the inner surface (114) of the triple contact connection member (110).

[0068] A triple contact connection member (110) may be positioned in front of the second ferrule member (130) along the insertion direction of the pipe. The non-welding joint device (100) according to the first embodiment of the present invention has a triple contact connection member (110), thereby possessing technical originality compared to a connecting device for a pipe or pipe according to the prior art.

[0069] The second ferrule member (130), the pipe and the service valve (210) are positioned inside the triple contact connection member (110), or the second ferrule member (130), the pipe and the pipe connection member (310) are positioned. When the nut member (170) is fastened to the service valve (210) or the pipe connection member (310), the outer surface of the second ferrule member (130), the pipe (90), and the service valve (210) or the pipe connection member (310) is pressed against the inner surface of the triple contact connection member (110), thereby maintaining a sealed state.

[0070] In this way, the second ferrule member (130), the pipe and service valve (210) or the pipe connection member (310) are all located inside the triple contact connection member (110).

[0071] Referring to FIGS. 3 and 4, the outer surface (111) of the triple contact connecting member (110) is provided in a cylindrical or cylindrical shape, and four center holes (113, 115, 117, 119) of different sizes or shapes may be formed inside the triple contact connecting member (110). Here, the four center holes (113, 115, 117, 119) may be arranged continuously along the insertion direction of the pipe and may be formed to be connected to each other.

[0072] The four center holes (113, 115, 117, 119) formed inside the triple contact connecting member (110) may include a first center hole (113) in which a second ferrule member (130) is positioned; a second center hole (115) connected to the first center hole (113) and in which a pipe (90) is positioned; a third center hole (117) connected to the second center hole (115) and having a smaller size than the second center hole (115); and a fourth center hole (119) connected to the third center hole (117) and in which a service valve (210) or a pipe connecting member (310) is positioned.

[0073] Here, a gasket member (190) described later may be positioned in the fourth center hole (119) and may come into contact with it.

[0074] The lengths (depths) of the first to fourth center holes (113, 115, 117, 119) with respect to the insertion direction or the center line (CL) direction of the pipe (190) are similar to each other in that the lengths (depths) of the first center hole (113), the second center hole (115), and the fourth center hole (119) are similar to each other, and the length (depth) of the third center hole (117) is the shortest.

[0075] Referring to FIG. 4, the first center hole (113) may be provided in a form in which the diameter (inner diameter) of the inner surface (114) is continuously reduced from one end of the triple contact connecting member (110) (the end adjacent to the second ferrule member (130)) toward the second center hole (115). That is, the first center hole (113) may be provided in a cone shape in which the diameter (inner diameter) of the inner surface (114) is continuously reduced along the insertion direction of the pipe (see the direction of arrow B).

[0076] Here, it is preferable that the angle between the outer surface (132) of the body (131) of the second ferrule member (130) and the center line (CL) is equal to or greater than the angle between the inner surface (114) of the first center hole (113) and the center line (CL).

[0077] The second center hole (115) and the third center hole (117) of the triple contact connecting member (110) may be formed in a cylindrical shape. That is, the inner surface (116) of the second center hole (115) and the inner surface (118) of the third center hole (117) are parallel to the center line (CL).

[0078] Meanwhile, the fourth center hole (119) of the triple contact connecting member (110) may be provided in a form in which the diameter (inner diameter) of the inner surface (120) is continuously reduced from the other end of the triple contact connecting member (110), i.e., the end facing the second ferrule member (130), toward the third center hole (117). That is, the fourth center hole (119) may be provided in a cone shape in which the diameter (inner diameter) of the inner surface (120) is continuously reduced in the opposite direction to the insertion direction of the pipe (see the direction of arrow B).

[0079] Here, the angle formed by the center line (CL) passing through the center of the triple contact connecting member (110) and the inclined surface (114) of the first center hole (113) may be formed to be smaller than the angle formed by the inclined surface (120) of the fourth center hole (119) with the center line. That is, the angle between the inner surface (120) of the fourth center hole (119) and the center line (CL) is preferably larger than the angle between the inner surface (114) of the first center hole (113) and the center line (CL). The inclination (angle) of the inner surface (120) of the fourth center hole (119) may be formed to be the same as or similar to the inclination (angle) of the inclined portion (213) of the service valve (210) inserted into and pressed into the fourth center hole (119) or the tapered portion (313) of the pipe connecting member (310).

[0080] In the triple contact connecting member (110), the smallest inner diameter among the diameters (inner diameters) of the inner surface (114) of the first center hole (113) may be larger than the diameter (inner diameter) of the inner surface (116) of the second center hole (115), the diameter of the inner surface (116) of the second center hole (115) may be larger than the diameter (inner diameter) of the inner surface (118) of the third center hole (117), and the smallest inner diameter among the diameters (inner diameters) of the inner surface (120) of the fourth center hole (119) may be provided to be the same as the inner diameter of the third center hole (117).

[0081] Referring to Fig. 4, the portion where the first center hole (113) and the second center hole (115) meet do not coincide with each other. That is, the portion with the smallest inner diameter among the inner surfaces (114) of the first center hole (113) is in contact with the second center hole (115), and the minimum inner diameter of the first center hole (113) is larger than the inner diameter of the second center hole (150). Therefore, a first step portion (113a) may be formed at the portion where the first center hole (113) and the second center hole (115) are connected.

[0082] One end (133) of the second ferrule member (130) can be pressed against the first step portion (113a) formed at the point where the first center hole (113) and the second center hole (115) are connected by making surface contact with each other.

[0083] In addition, since the inner diameter of the third center hole (117) is smaller than the inner diameter of the second center hole (115), a second step portion (115a) may be formed at the portion where the second center hole (115) and the third center hole (117) are connected. One end (92) of the pipe (190) may be compressed to the second step portion (115a) formed at the portion where the second center hole (115) and the third center hole (117) are connected (see FIG. 10a).

[0084] A service valve (210) can be press-connected to the fourth center hole (119) of the triple contact connecting member (110).

[0085] FIG. 3 illustrates a portion of a service valve (210), that is, a portion connected to a triple contact connecting member (110). The service valve (210) connected to the triple contact connecting member (110) and the nut member (170) may include a connecting body (211) having a through hole (215) formed therein and a stopper (212) integrally formed at the rear end of the connecting body (211). The stopper (212) may be provided in a form extending from the outer surface of the connecting body (211) along the circumferential direction of the connecting body (211).

[0086] A male screw portion (214) that engages with the female screw portion (173) of the nut member (170) can be formed on the outer surface of the connecting body (211).

[0087] An inclined portion (213) may be formed at one end of the connecting body (211) that is pressed against the inner surface (120) of the fourth center hole (119) of the triple contact connecting member (110). Here, the inclination (angle) of the inner surface (120) of the fourth center hole (119) may be formed to be the same as or similar to the inclination (angle) of the inclined portion (213) of the service valve (210) that is inserted into and pressed into the fourth center hole (119).

[0088] As illustrated in FIGS. 5A and 5B, a modified example of the weldless joint device (100) according to the first embodiment of the present invention may include a gasket member (190) positioned on one side of the triple contact connection member (110) facing the second ferrule member (130). That is, a modified example of the weldless joint device (100) according to the first embodiment of the present invention may include a gasket member (190) positioned between the fourth center hole (119) of the triple contact connection member (110) and the inclined portion (213) of the service valve (210).

[0089] As the nut member (170) and the service valve (210) are connected, the gasket member (190) can perform a sealing function by being compressed between the fourth center hole (119) of the triple contact connection member (110) and the inclined portion (213) of the service valve (210).

[0090] In the non-welding joint device (100) according to the first embodiment of the present invention, when the nut member (170) and the service valve (210) are completely fastened, the outer surface (132, 133) of the second ferrule member (130) is pressed against the inner surface (114) of the first center hole (113) of the triple contact connecting member (110), and the outer surface of the service valve (210), i.e., the inclined portion (213), or the gasket member (190) can be pressed against the inner surface (120) of the fourth center hole (119). At this time, the end portion (92, see FIG. 10b) of the pipe (90) can be pressed against the second step portion (115a) of the triple contact connecting member (110).

[0091]

[0092] Hereinafter, a weldless joint device (200) according to a second embodiment of the present invention will be described with reference to FIGS. 6 to 13. The difference from the weldless joint device (100) according to the first embodiment is that it includes a pipe connection member (310) instead of a service valve (210), and includes a pair of nut members (170), a first ferrule member (150), a second ferrule member (130), and a triple contact connection member (110) located on both sides of the pipe connection member (310).

[0093] The same drawing reference numerals are used for the same contents as the non-welding joint device (100) according to the first embodiment, and the description thereof is the same as that of the non-welding joint device (100) according to the first embodiment, so a repeated description is omitted.

[0094] Referring to FIGS. 6 to 9, the nut member (170), the first ferrule member (150), the second ferrule member (130), and the triple contact connection member (110) located on both sides of the pipe connection member (310) are the same as those of the non-welding joint device (100) according to the first embodiment.

[0095] A weldless joint device (200) according to a second embodiment of the present invention can connect two pipes (90) using a pipe connection member (310). That is, the weldless joint device (200) according to the second embodiment of the present invention can include a pipe connection member (310) positioned on one side of a triple contact connection member (110) facing a second ferrule member (130).

[0096] The pipe connecting member (310) may include a fitting member (311) located inside the nut member (170), one end (313) of which contacts the fourth center hole (119) of the triple contact connecting member (110) and has a male screw portion (314) formed on the outer surface; and a spacer portion (312) formed on the outer surface of the fitting member (311) and contacting the nut member (170).

[0097] The fitting portion (311) is formed on both sides of the spacer portion (312), and a tapered portion (313) may be formed at one end of the fitting portion (311).

[0098] The tapered portion (313) may be arranged to come into contact with the triple contact connecting member (110).

[0099] A tapered portion (313) may be formed at one end of the fitting portion (311) that is pressed against the inner surface (120) of the fourth center hole (119) of the triple contact connecting member (110). Here, the inclination (angle) of the inner surface (120) of the fourth center hole (119) may be formed to be the same as or similar to the inclination (angle) of the tapered portion (313) of the pipe connecting member (310) that is inserted into and pressed into the fourth center hole (119).

[0100] Referring to FIGS. 10a and 10b, in the non-welding joint device (200) according to the second embodiment of the present invention, when the nut member (170) and the pipe connection member (310) are completely fastened, the outer surface (132, 133) of the second ferrule member (130) may be pressed against the inner surface (114) of the first center hole (113) of the triple contact connection member (110), and the outer surface of the fitting portion (311) of the pipe connection member (310), i.e., the tapered portion (313), may be pressed against the inner surface (120) of the fourth center hole (119). At this time, the end portion (92) of the pipe (90) may be pressed against the second step portion (115a) of the triple contact connection member (110).

[0101] Meanwhile, referring to FIGS. 11A and 11B to 13, a modified example of the weldless joint device (200) according to the second embodiment of the present invention may include a gasket member (190) positioned on one side of the triple contact connection member (110) facing the second ferrule member (130). That is, a modified example of the weldless joint device (200) according to the second embodiment of the present invention may include a gasket member (190) positioned between the inner surface (120) of the fourth center hole (119) of the triple contact connection member (110) and the tapered portion (313) of the pipe connection member (310).

[0102] As the nut member (170) and the pipe connection member (310) are fastened, the gasket member (190) can exert a sealing function by being compressed between the inner surface (120) of the fourth center hole (119) of the triple contact connection member (110) and the tapered portion (313) of the pipe connection member (310).

[0103] In the non-welding joint device (200) according to the second embodiment of the present invention, when the nut member (170) and the pipe connection member (310) are completely fastened, the outer surface (132, 133) of the second ferrule member (130) can be pressed against the inner surface of the first center hole (113) of the triple contact connection member (110), and the gasket member (190) can be pressed against the inner surface of the fourth center hole (119). At this time, the end portion (92) of the pipe (90) can be pressed against the second step portion (115a) of the triple contact connection member (110).

[0104] As described above, the non-welding joint device (100, 200) according to the present invention has a triple contact connection member (110), so there is no need to form an expansion portion at the end of the pipe (90) connected to the service valve (210). In addition, it includes a pipe connection member (310) used when connecting two pipes (90), and a tapered portion (313) is formed at one end of the pipe connection member (310) connected to the triple contact connection member (110), so that a separate work is not required to connect the two pipes. In addition, the sealing property can be improved by adding a gasket member (190) between the triple contact connection member (110) and the service valve (210) or between the triple contact connection member (110) and the pipe connection member (310).

[0105] As described above, although one embodiment of the present invention has been described with specific details such as specific components and limited examples and drawings, these are provided only to help a more general understanding of the present invention, and the present invention is not limited to the above-described embodiments, and those with ordinary skill in the art to which the present invention pertains can make various modifications and variations based on this description. Therefore, the spirit of the present invention should not be limited to the described embodiments, and all things that are equivalent or equivalent to the claims below as well as the claims are considered to fall within the scope of the spirit of the present invention.

Claims

1. Absence of nuts; A first ferrule member located inside the nut member; A second ferrule member located inside the nut member and provided on one side of the first ferrule member; and A triple contact connecting member located inside the nut member and located on one side of the second ferrule member facing the first ferrule member; A weldless joint device characterized by including:

2. In paragraph 1, A non-welding joint device characterized in that a service valve is connected to one side of the triple contact connecting member facing the second ferrule member.

3. In paragraph 2, A non-welding joint device characterized by including a gasket member positioned on one side of the triple contact connecting member facing the second ferrule member.

4. In paragraph 1, A non-welded joint device characterized by including a pipe connecting member positioned on one side of the triple contact connecting member facing the second ferrule member.

5. In paragraph 4, The above pipe connecting member is, A non-welding joint device characterized by comprising: a fitting portion located inside the nut member, one end of which contacts the triple contact connecting member and has a male thread formed on the outer surface; and a spacer portion formed on the outer surface of the fitting portion and contacting the nut member.

6. In paragraph 5, A non-welding joint device characterized in that the fitting portion is formed on both sides of the spacer portion, and a tapered portion is formed at one end of the fitting portion.

7. In paragraph 6, A non-welding joint device characterized in that the above tapered portion is provided to contact the above triple contact connecting member.

8. In paragraph 7, A non-welding joint device characterized by including a gasket member positioned between the triple contact connecting member and the pipe connecting member.

9. In paragraph 2, A non-welding joint device characterized in that the outer surface of the triple contact connecting member is formed in a cylindrical or cylindrical shape, and four center holes of different sizes or shapes are formed inside the triple contact connecting member.

10. In paragraph 9, The four center holes formed inside the above triple contact connecting member are: A first center hole in which the second ferrule member is located; A second center hole connected to the first center hole and in which a pipe is located; A third center hole connected to the second center hole and having a smaller size than the second center hole; and A non-welding joint device characterized by including a fourth center hole connected to the third center hole and in which the gasket member, the service valve, or the pipe connection member is located.

11. In paragraph 10, The first center hole is provided in a form in which the inner diameter continuously decreases from one end of the triple contact connecting member toward the second center hole. The above second center hole and the above third center hole are provided in a cylindrical shape, A non-welding joint device characterized in that the fourth center hole is provided in a form in which the inner diameter continuously decreases from the other end of the triple contact connecting member toward the third center hole.

12. In paragraph 11, A non-welding joint device characterized in that the smallest inner diameter among the inner diameters of the first center hole is larger than the inner diameter of the second center hole, the inner diameter of the second center hole is larger than the inner diameter of the third center hole, and the smallest inner diameter among the inner diameters of the fourth center hole is provided to be the same as the inner diameter of the third center hole.

13. In paragraph 12, One end of the second ferrule member is pressed into the first step formed at the point where the first center hole and the second center hole are connected, A non-welding joint device characterized in that one end of the pipe is compressed to a second step formed at a portion where the second center hole and the third center hole are connected.

14. In paragraph 13, A non-welding joint device characterized in that the angle formed by the straight line passing through the center of the triple contact connecting member and the inclined surface of the first center hole is smaller than the angle formed by the inclined surface of the fourth center hole.

15. In paragraph 13, A non-welding joint device characterized in that the outer surface of the second ferrule member is pressed onto the inner surface of the first center hole, and the outer surface of the service valve or the pipe connection member or the gasket member is pressed onto the inner surface of the fourth center hole.

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