Pipe fitting combination and water heater

Abstract

The utility model discloses a pipe fitting combination and a water heater. The pipe fitting combination comprises a filter pipe, an inner pipe, an end cover and a clamping jaw piece. The end cover is provided with a central hole, one part of the end cover is sleeved in the head part of the filter pipe in a way of adapting to the pipe diameter of the filter pipe, and the end cover is connected with the filter pipe; the clamping jaw piece is provided with a central hole, and one part of the clamping jaw piece is sleeved in the tail part of the filter pipe in a manner of adapting to the pipe diameter of the filter pipe; the clamping jaw piece is connected with the filter pipe; a clamping jaw which is buckled inwards is arranged on the wall of a central hole of the clamping jaw piece; and the inner pipe is sleeved in the center holes of the end cover and the clamping jaw piece and is fixed. Through matched installation of the filter pipe, the inner pipe, the end cover and the clamping jaw piece, the head portion and the tail portion of the filter pipe are coaxially inserted into the end cover and the clamping jaw piece respectively, the end cover and the clamping jaw piece are each provided with a center hole, the two ends of the inner pipe are inserted into the center holes of the end cover and the clamping jaw piece respectively and fixed, an independent filter pipe module is formed, and transportation and convenient and fast installation with other components are facilitated.

Description

Technical Field

[0001] The utility model belongs to the field of water heaters, and in particular relates to a pipe assembly and a water heater. Background Art

[0002] In current water heaters, the insulating tube and the filter tube are generally integrated together. As for the supply chain, the suppliers of the insulating tube and the filter tube are different. Therefore, the insulating tube needs to be installed and sent to the filter tube supplier. After it is fully assembled, it is sent to the assembly factory for assembly of the whole machine. This will increase the transportation cost, and the insulating tube and the filter tube are very likely to be damaged during transportation. Secondly, when the filter material in the filter tube is exhausted and needs to be replaced, the filter tube cannot be disassembled separately due to the mechanical fastening method between the filter tube and the insulating tube. The filter tube needs to be replaced as a whole, resulting in an increase in replacement costs. In addition, for products with different positioning, the diameter size of the filter tube is different. When upgraded to a larger diameter size, the original insulating tube size is no longer suitable for the larger diameter filter tube, and modular assembly is not possible.

[0003] Chinese patent application number CN202311488341.3 discloses a water outlet pipe assembly connection method and water heater. It uses a similar method to a cross-groove-and-claw combination, where a cross groove is cut into the stainless steel filter tube, and the plastic end and bottom are provided with mating bumps, which are then inserted into the steel tube. A fastening ring and plastic claws are then used to lock the tube in place for secure installation. However, this method requires many parts and is expensive, especially due to the large number of plastic parts required, which are not very strong. These plastic parts are of a certain length, which sacrifices the volume of the filter media in the filter tube. Furthermore, the structure is too complex, the assembly process is complicated, and the assembly is difficult, which has a significant impact on production efficiency.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a pipe fitting combination that can reduce parts, improve strength, reduce costs and assembly difficulty, modularize assembly, and improve production efficiency.

[0006] Another object of the present invention is to provide a water heater having the above-mentioned pipe assembly.

[0007] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0008] A pipe fitting assembly comprises a filter pipe, an inner pipe, an end cover and a claw piece.

[0009] The end cap is provided with a center hole, a portion of the end cap is sleeved in the head of the filter tube in a manner adapted to the diameter of the filter tube, and the end cap is connected to the filter tube;

[0010] The claw piece has a central hole, a portion of which is sleeved in the tail of the filter tube in a manner adapted to the diameter of the filter tube; the claw piece is connected to the filter tube; an inwardly buckled claw is provided on the wall of the central hole of the claw piece;

[0011] The inner tube is sleeved in the center holes of the end cover and the claw member and fixed.

[0012] To facilitate modular transportation and assembly, the present invention forms an independent filter tube module by cooperating and assembling the filter tube, inner tube, end cap, and clamping piece. This facilitates transportation and convenient installation with other components. The head and tail of the filter tube are respectively inserted into the end cap and the clamping piece, each of which is provided with a center hole. The two ends of the inner tube are then respectively inserted into the center holes of the end cap and the clamping piece and fixed, forming a filter tube module. The filter tube wall is provided with multiple through holes, and there is a gap between the filter tube and the inner tube, which is filled with filter material.

[0013] Furthermore, a circumferential first groove is provided on the periphery of the end cover. With the first groove as the boundary, the outer diameter of the end cover part on one side of the first groove is smaller than the inner diameter of the filter tube and this part extends into the head of the filter tube, and the outer diameter of the end cover part on the other side of the first groove is larger than the outer diameter of the filter tube and is located outside the filter tube.

[0014] Because the end cap is installed at the port of the filter tube's head, a circumferential first groove is provided around the periphery of the end cap to prevent it from detaching from the filter tube and to better seal the gap between the filter tube and the inner tube at the head of the filter tube. The end cap portion on one side of the first groove, bounded by the first groove, has an outer diameter smaller than the inner diameter of the filter tube and extends into the head of the filter tube. The end cap portion on the other side of the first groove has an outer diameter larger than the outer diameter of the filter tube and is located outside the filter tube, sealing the gap between the filter tube and the inner tube. The edge of the port at the head of the filter tube is inwardly buckled, and the inwardly buckled portion fits into the first groove of the end cap, connecting the filter tube and the end cap.

[0015] Furthermore, the center hole of the end cap is at least partially tapered, the diameter of the tapered hole gradually increasing along the axial direction of the center hole of the end cap and from the end cap portion located outside the filter tube toward the end cap portion located inside the filter tube, and the fit between the center hole and the inner tube gradually changes from an interference fit to a clearance fit in the aforementioned direction; or, the inner wall of the center hole of the end cap is uniformly provided with a plurality of arc-shaped oblique support ribs along the circumference, the support ribs being arc-shaped along the circumference of the center hole, the thickness of the support ribs gradually decreasing along the axial direction of the center hole of the end cap and from the end cap portion located outside the filter tube toward the end cap portion located inside the filter tube, and the fit between the support ribs and the inner tube gradually changing from an interference fit to a clearance fit in the aforementioned direction. The inner tube and the end cap are fixed by an interference fit via the tapered center hole or the oblique support ribs.

[0016] Since one end of the inner tube is inserted into the center hole of the end cover, in order to fix the inner tube and the end cover and prevent them from falling off, the center hole of the end cover adopts a tapered hole, and the end cover and the inner tube are fixed by the interference fit between the center hole of the tapered hole and the inner tube; or there are multiple arc-shaped oblique support ribs on the inner wall of the center hole of the end cover, and the end cover and the inner tube are fixed by the interference fit between the oblique support ribs and the inner tube.

[0017] Furthermore, a circumferential second groove is provided on the periphery of the claw member, with the second groove as the boundary. The outer diameter of the claw member part on one side of the second groove is smaller than the inner diameter of the filter tube and this part extends into the tail of the filter tube, and the outer diameter of the claw member part on the other side of the second groove is larger than the outer diameter of the filter tube and is located outside the filter tube.

[0018] The edge of the port at the tail end of the filter tube is buckled inwards, and the buckled portion is embedded in the second groove of the claw member to realize the connection between the filter tube and the claw member.

[0019] Because the claw member is installed at the end of the filter tube, a second circumferential groove is provided around the periphery of the claw member to prevent it from detaching from the filter tube and to better seal the gap between the filter tube and the inner tube at the end of the filter tube. The claw member portion on one side of the second groove, bounded by the second groove, has an outer diameter smaller than the inner diameter of the filter tube and extends into the end of the filter tube. The claw member portion on the other side of the second groove has an outer diameter larger than the outer diameter of the filter tube and is located outside the filter tube, sealing the gap between the filter tube and the inner tube. The edge of the end of the filter tube is inwardly buckled, and the inwardly buckled portion is embedded in the second groove of the claw member to connect the filter tube and the claw member.

[0020] Furthermore, the center hole of the claw member is at least partially a tapered hole, and the diameter of the tapered hole gradually decreases along the axial direction of the center hole of the claw member and from the claw member part located inside the filter tube to the claw member part located outside the filter tube, and the fit between the center hole of the claw member and the inner tube gradually changes from a clearance fit to an interference fit in the above direction; or, the inner wall of the center hole of the claw member is evenly provided with multiple arc-shaped oblique support ribs along the circumferential direction, the support ribs are arc-shaped along the circumference of the center hole, the thickness of the support ribs gradually increases along the axial direction of the center hole of the claw member and from the claw member part located inside the filter tube to the end cover part located outside the filter tube, and the fit between the support ribs and the inner tube gradually changes from a clearance fit to an interference fit in the above direction.

[0021] The inner tube and the clamping claw are fixed by interference fit through the tapered center hole or the oblique supporting ribs.

[0022] Since the other end of the inner tube is inserted into the center hole of the claw part, in order to fix the inner tube and the claw part and prevent them from falling off, the center hole of the claw part adopts a tapered hole, and the interference fit between the center hole of the tapered hole and the inner tube is used to fix the claw part and the inner tube; or there are multiple arc-shaped oblique support ribs on the inner wall of the center hole of the claw part, and the interference fit between the oblique support ribs and the inner tube is used to fix the claw part and the inner tube.

[0023] Furthermore, the present invention provides a pipe assembly that also includes an insulating tube having a third groove formed on its outer circumference. When the insulating tube is inserted into the center hole of the claw member, the claw of the claw member engages in the third groove of the insulating tube, thereby connecting the claw member and the insulating tube. The claw of the claw member is elastic, and its natural size is slightly smaller than the outer diameter of the insulating tube. During assembly, the claw generates a radial gripping force to engage the third groove of the insulating tube.

[0024] Furthermore, the utility model provides a pipe fitting combination which also includes a water outlet pipe, the rear section of the water outlet pipe is inserted into the inner pipe, the front section of the insulating pipe is inserted into the inner pipe, and the water outlet pipe and the insulating pipe are plugged into the inner pipe; a fourth groove is provided on the outer periphery of the head of the insulating pipe, and a barb protruding inward and forward is provided on the water outlet pipe, and the water outlet pipe and the insulating pipe are plugged into and connected with the barb and the fourth groove.

[0025] The utility model also provides a water heater having the above-mentioned pipe assembly.

[0026] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art.

[0027] The utility model relates to a pipe assembly and a water heater, wherein the pipe assembly includes a filter tube, an inner tube, an end cap, and a claw member. The end cap is provided with a center hole, a portion of which is adapted to the diameter of the filter tube and is sleeved in the head of the filter tube, and the end cap is connected to the filter tube; the claw member has a center hole, a portion of which is adapted to the diameter of the filter tube and is sleeved in the tail of the filter tube; the claw member is connected to the filter tube; an inward-facing claw is provided on the wall of the center hole of the claw member; the inner tube is sleeved in the center holes of the end cap and the claw member and fixed. Through the coordinated installation of the filter tube, the inner tube, the end cap, and the claw member, the head and tail of the filter tube are respectively inserted into the end cap and the claw member, both of which are provided with center holes, and the two ends of the inner tube are respectively inserted into the center holes of the end cap and the claw member and fixed, thereby improving the strength and forming an independent filter tube module, which is convenient for transportation and installation with other components.

[0028] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0030] Figure 1 This is a schematic diagram of the assembly structure of a pipe assembly of the utility model;

[0031] Figure 2 yes Figure 1 A half-section diagram of

[0032] Figure 3 yes Figure 2 A magnified schematic diagram;

[0033] Figure 4 yes Figure 2 B is an enlarged schematic diagram;

[0034] Figure 5 It is a structural diagram of the end cover;

[0035] Figure 6 1. It is a structural diagram of a claw member;

[0036] Figure 7 It is a half-section schematic diagram of the insulating tube.

[0037] In the figure: 1. filter tube; 2. inner tube; 3. end cap; 31. first groove; 4. claw member; 41. second groove; 42. claw; 43. support rib; 5. insulating tube; 51. third groove, 52. fourth groove; 6. water outlet pipe; 61. barb.

[0038] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0041] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0042] Combine Figure 1-6 As shown, the utility model is a pipe assembly, including a filter tube 1, an inner tube 2, an end cover 3, and a claw part 4.

[0043] End cap 3 has a central hole. A portion of end cap 3, adapted to the diameter of filter tube 1, coaxially fits within the head of filter tube 1, connecting end cap 3 to filter tube 1. A claw member 4 has a central hole. A portion of claw member 4, adapted to the diameter of filter tube 1, coaxially fits within the tail of filter tube 1, connecting to filter tube 1. Inwardly facing claws 42 are provided on the central hole wall of claw member 4. Inner tube 2 coaxially fits within the central holes of end cap 3 and claw member 4 and is secured.

[0044] In other embodiments, a portion of the end cap 3 is adapted to the diameter of the filter tube 1 and can also be non-coaxially sleeved in the head of the filter tube 1, a portion of the claw member 4 is adapted to the diameter of the filter tube 1 and can also be non-coaxially sleeved in the tail of the filter tube 1, and the inner tube 2 can also be non-coaxially sleeved in the center holes of the end cap 3 and the claw member 4 and fixed.

[0045] In the present invention, according to the assembled state of each component, along the axial direction of the filter tube 1, the direction from the end cover 3 to the claw member 4 is backward, and the direction from the claw member 4 to the end cover 3 is forward.

[0046] To facilitate modular transportation and assembly, the present invention forms an independent filter tube module by coordinating and assembling the filter tube 1, inner tube 2, end cap 3, and claw member 4. This facilitates transportation and convenient installation with other components. The head and tail of the filter tube 1 are coaxially inserted into the end cap 3 and claw member 4, respectively. Both the end cap 3 and the claw member 4 are provided with a center hole. The two ends of the inner tube 2 are then inserted into the center holes of the end cap 3 and the claw member 4 and fixed, forming a filter tube module. The filter tube 1 wall is provided with multiple through holes, and there is a gap between the filter tube 1 and the inner tube 2, which is filled with filter material.

[0047] Combine Figure 1 、 2As shown in Figures 3 and 5, a circumferential first groove 31 is provided on the periphery of the end cover 3. With the first groove 31 as the boundary, the outer diameter of the end cover 3 on one side of the first groove 31 is smaller than the inner diameter of the filter tube 1 and this part extends into the head of the filter tube 1, and the outer diameter of the end cover 3 on the other side of the first groove 31 is larger than the outer diameter of the filter tube 1 and is located outside the filter tube 1.

[0048] Because the end cap 3 is installed at the port of the head of the filter tube 1, a circumferential first groove 31 is provided on the periphery of the end cap 3 to prevent the end cap 3 from detaching from the filter tube 1 and to better seal the gap between the filter tube 1 and the inner tube 2 at the head of the filter tube 1. The portion of the end cap 3 on one side of the first groove 31 has an outer diameter smaller than the inner diameter of the filter tube 1 and extends into the head of the filter tube 1. The portion of the end cap 3 on the other side of the first groove 31 has an outer diameter larger than the outer diameter of the filter tube 1 and is located outside the filter tube 1, sealing the gap between the filter tube 1 and the inner tube 2. The edge of the port at the head of the filter tube 1 is inwardly bent, and the inwardly bent portion is embedded in the first groove 31 of the end cap 3 to connect the filter tube 1 and the end cap 3.

[0049] The center hole of the end cap 3 is at least partially tapered, with the diameter of the tapered hole gradually increasing along the axis of the center hole of the end cap 3 and from the portion of the end cap 3 located outside the filter tube 1 to the portion of the end cap 3 located inside the filter tube 1, and the fit between the center hole and the inner tube 2 gradually changes from an interference fit to a clearance fit in the aforementioned direction. Alternatively, the inner wall of the center hole of the end cap 3 is uniformly provided with a plurality of arc-shaped oblique support ribs along the circumference, the support ribs being arc-shaped along the circumference of the center hole, the thickness of the support ribs gradually decreasing along the axis of the center hole of the end cap 3 and from the portion of the end cap 3 located outside the filter tube 1 to the portion of the end cap 3 located inside the filter tube 1, and the fit between the support ribs and the inner tube 2 gradually changing from an interference fit to a clearance fit in the aforementioned direction. The inner tube 2 and the end cap 3 are fixed by an interference fit via the tapered center hole or the oblique support ribs.

[0050] Since one end of the inner tube 2 is inserted into the center hole of the end cover 3, in order to fix the inner tube 2 and the end cover 3 and prevent them from falling off, the center hole of the end cover 3 is in the form of a tapered hole, and the end cover 3 and the inner tube 2 are fixed by the interference fit between the center hole of the tapered hole and the inner tube 2; or there are multiple arc-shaped oblique supporting ribs on the inner wall of the center hole of the end cover 3, and the end cover 3 and the inner tube 2 are fixed by the interference fit between the oblique supporting ribs and the inner tube 2.

[0051] In this embodiment, the center hole of the end cover 3 is a tapered hole, so that the inner tube 2 and the end cover 3 are fixed by interference fit.

[0052] Combine Figure 1 、 2As shown in Figures 4 and 6, a circumferential second groove 41 is provided on the periphery of the claw member 4. With the second groove 41 as the boundary, the outer diameter of the portion of the claw member 4 on one side of the second groove 41 is smaller than the inner diameter of the filter tube 1 and this portion extends into the tail of the filter tube 1, and the outer diameter of the portion of the claw member 4 on the other side of the second groove 41 is larger than the outer diameter of the filter tube 1 and is located outside the filter tube 1.

[0053] The edge of the port at the tail end of the filter tube 1 is inwardly buckled, and the inwardly buckled portion is embedded in the second groove 41 of the claw member 4 to achieve the connection between the filter tube 1 and the claw member 4.

[0054] Since the claw member 4 is installed at the rear end of the filter tube 1, in order to prevent the claw member 4 from detaching from the filter tube 1 and to better seal the gap between the filter tube 1 and the inner tube 2 at the rear end of the filter tube 1, a circumferential second groove 41 is provided on the periphery of the claw member 4. With the second groove 41 as the boundary, the outer diameter of the claw member 4 on one side of the second groove 41 is smaller than the inner diameter of the filter tube 1 and extends into the rear end of the filter tube 1. The outer diameter of the claw member 4 on the other side of the second groove 41 is larger than the outer diameter of the filter tube 1 and is located outside the filter tube 1 to seal the gap between the filter tube 1 and the inner tube 2. The edge of the port at the rear end of the filter tube 1 is inwardly buckled, and the inwardly buckled portion is embedded in the second groove 41 of the claw member 4 to achieve the connection between the filter tube 1 and the claw member 4.

[0055] The center hole of the claw member 4 is at least partially a tapered hole, and the diameter of the tapered hole gradually decreases along the axial direction of the center hole of the claw member 4 and from the part of the claw member 4 located inside the filter tube 1 to the part of the claw member 4 located outside the filter tube 1, and the fit between the center hole of the claw member 4 and the inner tube 2 gradually changes from a clearance fit to an interference fit in the above direction; or, the inner wall of the center hole of the claw member 4 is evenly provided with a plurality of arc-shaped oblique support ribs along the circumferential direction, the support ribs are arc-shaped along the circumference of the center hole, and the thickness of the support ribs gradually increases along the axial direction of the center hole of the claw member 4 and from the part of the claw member 4 located inside the filter tube 1 to the part of the end cover 3 located outside the filter tube 1, and the fit between the support ribs and the inner tube 2 gradually changes from a clearance fit to an interference fit in the above direction.

[0056] The inner tube 2 and the claw member 4 are fixed by interference fit through the tapered center hole or the oblique supporting ribs.

[0057] In this embodiment, an oblique supporting rib 43 is provided on the inner wall of the center hole of the clamping claw 4 to achieve interference fit fixation between the inner tube 2 and the clamping claw 4 .

[0058] Since the other end of the inner tube 2 is inserted into the center hole of the claw part 4, in order to fix the inner tube 2 and the claw part 4 and prevent them from falling off, the center hole of the claw part 4 adopts a tapered hole, and the interference fit between the center hole of the tapered hole and the inner tube 2 is used to fix the claw part 4 and the inner tube 2; or there are multiple arc-shaped oblique support ribs 43 on the inner wall of the center hole of the claw part 4, and the interference fit between the oblique support ribs 43 and the inner tube 2 is used to fix the claw part 4 and the inner tube 2.

[0059] Combine Figure 1 、 2 As shown in Figures 4 and 7, the utility model further comprises an insulating tube 5 having a third groove 51 formed on its outer circumference. When the insulating tube 5 is inserted into the center hole of the claw member 4, the claw 42 of the claw member 4 engages with the third groove 51 of the insulating tube 5, thereby connecting the claw member 4 to the insulating tube 5. In this embodiment, the claw member 4 is a plastic component, and its claw 42 is elastic. The natural size of the claw 42 is slightly smaller than the outer diameter of the insulating tube 5, thereby generating a radial gripping force to engage the third groove 51 of the insulating tube 5 during assembly. The material of the claw 42 is not limited to plastic; any material (such as metal) that meets the strength and rigidity requirements of the claw 42 can be used.

[0060] The third groove 51 on the outer periphery of the insulating tube 5 is a circumferential annular groove, or the third groove 51 is one or more discretely arranged grooves and matches the barbs 61 of the claw member 4; in this embodiment, the third groove 51 is a circumferential annular groove and is a conical groove, and the depth of the groove bottom gradually decreases from front to back along the axial direction of the insulating tube 5.

[0061] The exterior of the insulating tube 5 is in the shape of a stepped shaft, and there is a first step behind the third groove 51 on the insulating tube 5 that is higher than the top of the third groove 51. The position of the claw member 4 is limited by the first step, that is, when the insulating tube 5 passes through the center hole of the claw member 4, the first step behind the third groove 51 on the insulating tube 5 limits the forward movement of the claw member 4, and the barb 61 on the claw member 4 just slides into the third groove 51 of the insulating tube 5, so that the claw member 4 cannot be separated from the insulating tube 5 in both axial directions of the insulating tube 5.

[0062] In this embodiment, the claw member 4 comprises two groups of claws 42, each group comprising two claws 42, with the four claws 42 evenly distributed along the circumference. Considering the double-sided demolding, one group of claws 42 is provided with a demolding groove, while the other group of claws 42 does not need one. In other embodiments, the combination of claws 42 is not limited to two groups, and multiple groups may be provided.

[0063] The tail of the inner tube 2 is provided with an outer flange, and the front of the third groove 51 on the insulating tube 5 has a second step lower than the top of the third groove 51. The front end of the insulating tube 5 is inserted into the center hole of the claw member 4 and then into the inner tube 2. The outer flange of the inner tube 2 contacts and abuts against the second step of the insulating tube 5.

[0064] Combine Figure 1 、 2As shown in Figures 4 and 7, the present invention provides a pipe assembly further comprising a water outlet pipe 6, the rear end of which is inserted into the inner tube 2, and the front end of the insulating tube 5 is inserted into the inner tube 2. The water outlet pipe 6 and the insulating tube 5 are plugged into the inner tube 2. A fourth groove 52 is provided on the outer periphery of the head of the insulating tube 5. The water outlet pipe 6 is provided with barbs 61 protruding inward and forward. The water outlet pipe 6 is plugged into the insulating tube 5 and connected by the barbs 61 in the fourth groove 52. In this embodiment, the fourth groove 52 is a circumferential annular groove with a tapered groove, and the depth of the groove bottom gradually decreases from front to back along the axial direction of the insulating tube 5.

[0065] Barb 61 is dovetail-shaped, rectangular, triangular, or trapezoidal, with the front end of barb 61 being equal to or greater than the rear end. Barb 61 is provided with a through-hole for hooking and pulling barb 61 with a tool. To separate the outlet pipe 6 and the insulating tube 5, a tool is inserted into the through-hole, hooked onto barb 61, and pulled outward, disengaging the inwardly protruding end of barb 61 from the fourth groove 52 of the insulating tube 5.

[0066] In order to make the connection and installation of the outlet pipe 6 and the insulating tube 5 more stable, after the outlet pipe 6 and the insulating tube 5 are plugged in, the tail end of the outlet pipe 6 also extends to the second step of the insulating tube 5. There is a clear gap between the outlet pipe 6 and the inner tube 2, which makes it easy for the outlet pipe 6 to be inserted into the inner tube 2.

[0067] The utility model relates to a pipe assembly, which forms an independent filter tube module capable of assembling fillers separately through an end cap 3, a claw member 4, a filter tube 1 and an inner tube 2. During installation, the filter tube module only needs to be put on the insulating tube 5 from front to back, and the claw 42 of the claw member 4 can be clamped into the third groove 51 on the insulating tube 5 to install it in place. During disassembly, the filter tube module and the insulating tube 5 can be disassembled by pulling the claw 42 upward with force. Then, the outlet pipe 6 is inserted into the inner tube 2 from front to back, so that the outlet pipe 6 and the insulating tube 5 are plugged in and the barbs 61 on the outlet pipe 6 are connected with the fourth groove 52 on the insulating tube 5. There is a clear gap between the inner tube 2 and the outlet pipe 6, which facilitates the insertion of the outlet pipe 6 into the inner tube 2.

[0068] The extension portion of the claw member 4 before the second groove 41, i.e., the portion inserted into the filter tube 1, provides a sufficiently long support surface for the filter tube 1; the extension portion of the claw member 4 after the second groove 41, i.e., the portion where the claw member 4 and the insulating tube 5's third groove 51 are sleeved together, provides a sufficiently long support surface for the stable connection between the claw member 4 and the filter tube module and the insulating tube 5. Because the claw 42 on the claw member 4 needs to be elastic, there are cavities on both sides of the claw 42. Based on this, in order to ensure the strength of the claw member 4, the extension portion of the claw member 4 before the second groove 41, i.e., the portion inserted into the filter tube 1, and the extension portion of the claw member 4 after the second groove 41, i.e., the portion where the claw member 4 and the insulating tube 5's third groove 51 are sleeved together, are equal in length, or the latter is 1.5-2 times the length of the former. In this embodiment, the two are equal in length. Furthermore, with the radial centerline of the portion extending behind the second groove 41 of the claw member 4 as the boundary, the portion of the claw 42 on the claw member 4 located behind the radial centerline is longer than the portion of the claw 42 on the claw member 4 located behind the radial centerline. In other words, the majority of the claw 42 is located behind the radial centerline. Another strength-enhancing feature is that, due to the second groove 41 on the claw member 4, an oblique support rib 43 is provided on the inner wall of the center hole of the claw member 4. The rear end of the rib extends beyond the second groove 41 of the claw member 4 to the portion where the claw member 4 and the insulating tube 5 are located where the third groove 51 is located, but does not reach the claw 42, thereby enhancing overall strength.

[0069] Similarly, the extended portion behind the first groove 31 of the end cover 3 , ie, the portion of the end cover 3 inserted into the filter tube 1 , also provides a sufficient supporting surface for the filter tube 1 .

[0070] The present invention also provides a water heater having the aforementioned pipe fitting combination. By employing the aforementioned pipe fitting combination, even if different models of water heaters employ filter tubes of different diameters, suitable clamping members can be used to match insulating tubes of the same diameter, eliminating the need to redesign molds for insulating tubes of different diameters. This reduces the overall manufacturing cost and improves efficiency for different models of water heaters.

[0071] The utility model provides a pipe fitting assembly and water heater. In the pipe fitting assembly, the outer diameters of the clamping jaws and end caps can be flexibly adjusted according to the diameters of filter tubes of different diameters. This eliminates the dependence of the filter tubes on the insulating tubes. This allows installation of filter tubes of different sizes without changing the structure of the outlet pipe and insulating tube, achieving adaptability for different filter tubes. The overall installation and disassembly of the filter tube module is simplified, as the filter tube module is independent of the outlet pipe and insulating tube, facilitating ease of assembly and transportation, reducing component count, and lowering production costs.

[0072] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments with equivalent changes using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A pipe fitting assembly, characterized in that: Including filter tube, inner tube, end cover, claw parts, The end cap is provided with a center hole, a portion of the end cap is sleeved in the head of the filter tube in a manner adapted to the diameter of the filter tube, and the end cap is connected to the filter tube; The claw piece has a central hole, a portion of which is sleeved in the tail of the filter tube in a manner adapted to the diameter of the filter tube; the claw piece is connected to the filter tube; an inwardly buckled claw is provided on the wall of the central hole of the claw piece; The inner tube is sleeved in the center holes of the end cover and the claw member and fixed.

2. A pipe fitting assembly according to claim 1, characterized in that: A circumferential first groove is provided on the periphery of the end cover. With the first groove as the boundary, the outer diameter of the end cover part on one side of the first groove is smaller than the inner diameter of the filter tube and this part extends into the head of the filter tube, and the outer diameter of the end cover part on the other side of the first groove is larger than the outer diameter of the filter tube and is located outside the filter tube; the port edge of the head of the filter tube is inwardly buckled, and the inwardly buckled part is embedded in the first groove of the end cover to realize the connection between the filter tube and the end cover.

3. A pipe fitting assembly according to claim 2, characterized in that: The center hole of the end cover is at least partially a tapered hole, and the diameter of the tapered hole gradually increases along the axial direction of the center hole of the end cover and from the end cover portion located outside the filter tube to the end cover portion located inside the filter tube; or, the inner wall of the center hole of the end cover is evenly provided with a plurality of arc-shaped oblique support ribs along the circumferential direction, the support ribs are arc-shaped along the circumference of the center hole, and the thickness of the support ribs gradually decreases along the axial direction of the center hole of the end cover and from the end cover portion located outside the filter tube to the end cover portion located inside the filter tube.

4. A pipe fitting assembly according to claim 3, characterized in that: The inner tube and the end cover are fixed by interference fit through the tapered center hole or the oblique supporting ribs.

5. A pipe fitting assembly according to claim 4, characterized in that: A circumferential second groove is provided on the periphery of the claw member, with the second groove as the boundary. The outer diameter of the claw member part on one side of the second groove is smaller than the inner diameter of the filter tube and this part extends into the tail of the filter tube, and the outer diameter of the claw member part on the other side of the second groove is larger than the outer diameter of the filter tube and is located outside the filter tube; the edge of the port at the tail of the filter tube is inwardly buckled, and the inwardly buckled part is embedded in the second groove of the claw member to realize the connection between the filter tube and the claw member.

6. The pipe assembly according to claim 5, characterized in that: The center hole of the claw member is at least partially a tapered hole, and the diameter of the tapered hole gradually decreases along the axial direction of the center hole of the claw member and from the claw member part located inside the filter tube to the claw member part located outside the filter tube; or, the inner wall of the center hole of the claw member is evenly provided with multiple arc-shaped oblique support ribs along the circumference, the support ribs are arc-shaped along the circumference of the center hole, and the thickness of the support ribs gradually increases along the axial direction of the center hole of the claw member and from the claw member part located inside the filter tube to the end cover part located outside the filter tube.

7. The pipe assembly according to claim 6, characterized in that: The inner tube and the clamping claw are fixed by interference fit through the tapered center hole or the oblique supporting ribs.

8. A pipe fitting assembly according to any one of claims 1 to 7, characterized in that: It also includes an insulating tube, a third groove is provided on the outer circumference of the insulating tube, when the insulating tube passes through the center hole of the claw part, the claw of the claw part is clamped into the third groove of the insulating tube to realize the connection between the claw part and the insulating tube.

9. The pipe fitting assembly according to claim 8, characterized in that: It also includes a water outlet pipe, the rear section of the water outlet pipe is inserted into the inner pipe, the front section of the insulating pipe is inserted into the inner pipe, and the water outlet pipe and the insulating pipe are plugged into the inner pipe; a fourth groove is provided on the outer periphery of the head of the insulating pipe, and a barb protruding inward and forward is provided on the water outlet pipe. The water outlet pipe and the insulating pipe are plugged into and connected with the barb and the fourth groove.

10. A water heater, characterized in that: A pipe fitting combination according to any one of claims 1 to 9.

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