Reducing pipe sleeve, pipe fitting combination and water heater

Abstract

The utility model discloses a reducing pipe sleeve, a pipe fitting combination and a water heater, the reducing pipe sleeve comprises a head part and a tail part, and the head part and the tail part are connected through a reducing part; and barbs are arranged at the tail part of the reducing pipe sleeve. The pipe fitting combination comprises a filter pipe, an insulating pipe and a reducing pipe sleeve. The pipe diameter of the head part of the variable-diameter pipe sleeve is matched and connected with the pipe diameter of the filter pipe, and the pipe diameter of the tail part of the variable-diameter pipe sleeve is matched and connected with the pipe diameter of the insulating pipe. The filter pipe and the insulating pipe are connected by arranging the reducing pipe sleeve, so that the filter pipe and the insulating pipe with different pipe diameters can be assembled only by selecting the reducing pipe sleeve with different pipe diameters which is a smaller part, and therefore, the filter pipe and the insulating pipe with different pipe diameters can be assembled under the condition that the pipe diameters of the insulating pipes of different types of products are the same, and the filter pipe needs to adopt different pipe diameters. Modularized assembly can be achieved only by additionally installing a proper variable-diameter pipe sleeve, universality of other components is achieved, the number of the components of the whole pipe fitting assembly is reduced, cost and assembly difficulty are reduced, and production efficiency is improved.

Description

Technical Field

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

[0002] In water heaters, the filter tube is currently fixed on the insulating tube. However, for products with different positioning, the diameter of the filter tube is different. When upgraded to a larger diameter, the original insulating tube size is no longer suitable for the larger diameter filter tube, and modular assembly cannot be achieved. At this time, the size of the insulating tube often needs to be modified, and the mold size of the insulating tube needs to be adjusted, which increases the design cost.

[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 reducer sleeve which adopts reducer sleeves with different diameter heads to adapt to filter tubes of different diameters and match insulating tubes of the same diameter.

[0006] The second purpose of the present invention is to provide a pipe assembly that can reduce parts, improve strength, reduce costs and assembly difficulty, and improve production efficiency.

[0007] The third object of the present invention is to provide a water heater having the above-mentioned pipe assembly.

[0008] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0009] The reducer sleeve comprises a head and a tail, wherein the head and the tail of the reducer sleeve are connected via a reducing portion; and the tail of the reducer sleeve is provided with barbs.

[0010] Furthermore, the barbs of the reducer sleeve are inwardly protruding barbs.

[0011] Furthermore, the barb is dovetail-shaped, rectangular, triangular or trapezoidal, wherein the dimension of one end of the barb facing the head of the reducer sleeve is greater than or equal to the dimension of one end of the barb facing the tail of the reducer sleeve.

[0012] The utility model also provides a pipe assembly, including a filter pipe, an insulating pipe and the aforementioned reducing pipe sleeve.

[0013] The diameter of the reducer sleeve's head matches that of the filter tube, which is then connected to the filter tube's tail. The diameter of the reducer sleeve's tail matches that of the insulating tube, which is then connected to the insulating tube. Using reducers with different head diameters accommodates filter tubes of varying diameters and matches insulating tubes of the same diameter.

[0014] By setting a reducing pipe sleeve to connect the filter tube and the insulating tube, the assembly of filter tubes and insulating tubes of different diameters can be achieved by simply selecting a smaller component, the reducing pipe sleeve, of different diameters. This allows the insulating tubes of different models to have the same diameter, while the filter tubes need to have different diameters. Modular assembly can be achieved by simply adding a suitable reducing pipe sleeve, avoiding the large-scale operation of changing the size of other parts such as the insulating tube, reducing design costs, and achieving the versatility of other components.

[0015] Furthermore, a pipe assembly further includes an end cap and a water outlet pipe. The end cap is annular and has a central hole. A portion of the end cap is adapted to the diameter of the filter pipe and extends into the end of the filter pipe away from the insulating pipe, i.e., into the head port of the filter pipe. The water outlet pipe passes through the central hole of the end cap and into the filter pipe.

[0016] To allow the water outlet pipe to be installed within the filter tube and to block the filter tube opening, preventing filter material from leaking out of the end of the filter tube away from the insulating tube, the present invention includes a pipe assembly comprising an end cap. The end cap is annular, and a portion of the end cap has an outer diameter that matches the inner diameter of the filter tube, allowing this portion of the end cap to extend into the end of the filter tube away from the insulating tube. Furthermore, the end cap has a center hole, through which the water outlet pipe passes and into the filter tube. The outer diameter of the water outlet pipe matches the diameter of the center hole of the end cap, allowing the water outlet pipe to penetrate the center hole of the end cap without leaking filter material from the filter tube through the gap between the water outlet pipe and the center hole of the end cap.

[0017] 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 port 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.

[0018] Furthermore, the edge of the first port of the filter tube is inwardly bent, and the inwardly bent portion is embedded in the first groove of the end cover.

[0019] In order to ensure that the end cap effectively blocks one end of the filter tube and maintains an effective connection between the end cap and the filter tube, the present invention provides a stepped shape with different outer diameters. A circumferential first groove is provided around the periphery of the end cap. The end cap portion on one side of the first groove has an outer diameter smaller than the inner diameter of the filter tube and extends into the end of the filter tube away from the insulating tube, while 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. Thus, the portion of the end cap with an outer diameter larger than the outer diameter of the filter tube blocks the filter tube port, while the portion of the end cap with an outer diameter smaller than the inner diameter of the filter tube is located within the filter tube, providing a sufficient support surface. Furthermore, the inwardly buckled edge of the filter tube's head port is embedded in the first groove of the end cap, ensuring an effective connection between the end cap and the filter tube and preventing it from easily falling off.

[0020] Furthermore, a second groove is provided on the insulating tube. When the reducer sleeve is connected to the insulating tube, the barbs of the reducer sleeve are stuck in the second groove of the insulating tube.

[0021] In order to conveniently and stably connect the reducer sleeve and the insulating tube, the present invention utilizes the cooperation of barbs and grooves. Barbs are provided at the tail of the reducer sleeve, and correspondingly, a second groove is provided on the insulating tube. When the reducer sleeve and the insulating tube are connected, the two are inserted into each other. When the barbs at the tail of the reducer sleeve slide into the second groove on the insulating tube, the reducer sleeve and the insulating tube can be connected. When the reducer sleeve and the insulating tube are pulled away from each other, the protruding end of the barb abuts against the wall of the second groove, preventing the reducer sleeve and the insulating tube from separating. In order to prevent the reducer sleeve and the insulating tube from being inserted into each other without restriction in the forward direction, the insulating tube is stepped, and the position of the reducer sleeve is limited by the steps. That is, the steps of the insulating tube limit the forward movement of the reducer sleeve, and the barbs on the reducer sleeve just slide into the second groove of the insulating tube, so that the reducer sleeve cannot separate from the insulating tube in both axial directions of the insulating tube.

[0022] Furthermore, the second groove of the insulating tube is arranged on the outer periphery of the insulating tube. The second groove is a circumferential annular groove, or the second groove is one or more discrete grooves that match the barbs of the reducer sleeve.

[0023] In order to conveniently and stably connect the reducer sleeve and the insulating tube, and also to conveniently separate the reducer sleeve and the insulating tube when needed, the insulating tube has a second groove disposed on its outer periphery, and the barbs of the reducer sleeve are inwardly protruding barbs. This allows the operator to see the barbs from the outside and pull the barbs outward, causing the inwardly protruding end of the barb to disengage from the second groove of the insulating tube. This prevents the groove wall of the second groove from restricting the barbs of the reducer sleeve, thereby enabling the reducer sleeve and the insulating tube to be relatively separated. In order to conveniently connect the reducer sleeve and the insulating tube, the second groove on the insulating tube is a circumferential annular groove. Since the second groove is a complete annular groove, as long as the reducer sleeve and the insulating tube are axially inserted into each other, the barbs on the reducer sleeve can slide into the second groove of the insulating tube, thereby achieving the connection between the reducer sleeve and the insulating tube. Alternatively, in order to enhance the strength of the insulating tube, the second groove on the insulating tube is one or more discretely arranged grooves. In this way, the circumferential position of the second groove on the insulating tube is not a complete ring, and the tube wall at the position where there is no second groove on the insulating tube is thicker, thereby enhancing the strength of the insulating tube. At the same time, the second groove on the insulating tube matches the barb of the reducer sleeve. When the reducer sleeve and the insulating tube are axially inserted into each other, that is, the step of the insulating tube limits the advancement of the reducer sleeve, if the barb on the reducer sleeve does not slide into the second groove of the insulating tube at this time, it is only necessary to rotate the reducer sleeve along the circumference of the insulating tube to make the barb on the reducer sleeve slide into the second groove of the insulating tube, thereby realizing the connection between the reducer sleeve and the insulating tube.

[0024] When there is one barb on the reducer sleeve, there is one second groove on the insulating tube, and the length of the second groove along the circumference of the insulating tube is adapted to the length of the barb along the circumference of the reducer sleeve, or the former is greater than the latter to a certain extent, for example, the former is 2 times, 3 times or other multiples of the latter.

[0025] When there are multiple barbs distributed along the circumference on the reducer sleeve, there are multiple second grooves distributed along the circumference of the insulating tube, and the multiple second groove positions correspond one-to-one to the multiple barb positions. Alternatively, adjacent second grooves can be merged and connected so that the number of second grooves is less than the number of barbs, but all barbs should be able to slide into the second grooves. For example, there are 4 barbs, which are evenly distributed along the circumference of the reducer sleeve, and the number of second grooves is 2. Each second groove occupies a quarter of the circumferential length of the insulating tube or is slightly longer than one of the four lengths. Such a second groove setting can enhance the strength of the insulating tube at the second groove.

[0026] The barbs of the reducer sleeve are dovetail-shaped, rectangular, triangular or trapezoidal, wherein the size of one end of the barb facing the head of the reducer sleeve is greater than or equal to the size of the other end of the barb facing the tail of the reducer sleeve.

[0027] The barb is provided with a through hole for hooking the barb with a tool. When the reducer sleeve and the insulating tube need to be separated, the tool is inserted into the through hole to hook the barb and pull the barb outwards so that the inwardly protruding end of the barb is disengaged from the second groove of the insulating tube.

[0028] The utility model also provides a water heater having the above-mentioned pipe assembly, which reduces the overall manufacturing cost and improves the efficiency of water heaters of different models.

[0029] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art.

[0030] The present invention relates to a reducer sleeve, a pipe fitting assembly, and a water heater. The reducer sleeve comprises a head and a tail, connected by a reducing portion. The tail of the reducer sleeve is provided with barbs. The pipe fitting assembly includes a filter tube, an insulating tube, and a reducer sleeve. The diameter of the head of the reducer sleeve matches that of the filter tube, which is connected to the filter tube; the diameter of the tail of the reducer sleeve matches that of the insulating tube, which is connected to the insulating tube. By setting a reducing pipe sleeve to connect the filter tube and the insulating tube, the assembly of filter tubes and insulating tubes of different diameters can be achieved by simply selecting a smaller component, the reducing pipe sleeve, of different diameters. This allows the insulating tubes of different models to have the same diameter, while the filter tubes need to have different diameters. Modular assembly can be achieved by simply adding a suitable reducing pipe sleeve, avoiding the large-scale operation of changing the size of other parts such as the insulating tube, reducing design costs, and achieving the versatility of other parts. In addition, this pipe combination as a whole reduces parts, improves strength, reduces costs and assembly difficulty, and improves production efficiency.

[0031] 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

[0032] 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:

[0033] Figure 1 This is a schematic diagram of the assembly of the pipe fitting assembly of the utility model;

[0034] Figure 2 It is a half-section schematic diagram of the assembly drawing of the filter tube, the reducer sleeve and the insulating tube of the pipe fitting combination of the utility model;

[0035] Figure 3It is a half-section schematic diagram of the assembly drawing of the outlet pipe, end cover and filter pipe of the pipe fitting combination of the utility model;

[0036] Figure 4 It is a schematic diagram of the end cover of the pipe fitting assembly of the utility model;

[0037] Figure 5 This is a schematic diagram of the reducer sleeve of the utility model;

[0038] Figure 6 It is a schematic diagram of an insulating pipe of the pipe fitting combination of the utility model.

[0039] In the figure: 1, filter tube; 2, reducer sleeve; 21, barb; 3, insulation tube; 31, second groove; 32, third groove; 4, water outlet pipe; 5, end cover; 51, first groove.

[0040] 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

[0041] 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.

[0042] 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.

[0043] 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.

[0044] like Figure 5As shown, the reducer sleeve 2 provided by the present invention comprises a head and a tail, which are connected by a reducing portion; the tail of the reducer sleeve is provided with barbs 21. The diameter of the reducing portion gradually decreases from thick to thin.

[0045] The barbs 21 of the reducer sleeve 2 are inwardly protruding barbs 21 .

[0046] The barb 21 is dovetail-shaped, rectangular, triangular or trapezoidal, wherein the dimension of the end of the barb 21 facing the head of the reducer sleeve 2 is greater than or equal to the dimension of the end of the barb 21 facing the tail of the reducer sleeve 2 .

[0047] The pipe assembly provided by the present invention comprises a filter pipe 1, an insulating pipe 3, the aforementioned reducer sleeve 2, an end cover 5 and a water outlet pipe 4.

[0048] Combine Figure 1 、 2 As shown in Figures 5 and 6, the diameter of the reducer sleeve 2 at its head matches that of the filter tube 1, and the reducer sleeve 2 is connected to the tail of the filter tube 1. The diameter of the tail of the reducer sleeve 2 matches that of the insulating tube 3, and the tail of the reducer sleeve 2 is connected to the insulating tube 3. Both the reducer sleeve 2 and the filter tube 1 are made of metal, and the head of the reducer sleeve 2 is welded to the tail of the filter tube 1. The filter tube 1 has multiple through-holes in its wall. Using reducer sleeves 2 with different head diameters accommodates filter tubes 1 of varying diameters and matches insulating tubes 3 of the same diameter.

[0049] By providing a reducing pipe sleeve 2 to connect the filter tube 1 and the insulating tube 3, the filter tube 1 and the insulating tube 3 of different diameters can be assembled by simply selecting a smaller component, the reducing pipe sleeve 2 of different diameters. This allows the insulating tubes 3 of different models of products to have the same diameter, while the filter tubes 1 need to have different diameters. Modular assembly can be achieved by simply adding a suitable reducing pipe sleeve 2, avoiding the large-scale operation of changing the sizes of other parts such as the insulating tube 3, reducing design costs, and achieving the versatility of other components.

[0050] In order to conveniently and firmly connect the reducer sleeve 2 and the insulating tube 3, the present invention utilizes the cooperation of the barbs 21 and the grooves. Figure 2 、 5 As shown, a barb 21 is provided at the tail of the reducer sleeve 2. Figure 2 、 6As shown, a second groove 31 is provided on the insulating tube 3. When the reducer sleeve 2 is connected to the insulating tube 3, the two are inserted into each other. When the barb 21 at the tail of the reducer sleeve 2 slides into and is stuck in the second groove 31 on the insulating tube 3, the reducer sleeve 2 and the insulating tube 3 are connected. When the reducer sleeve 2 and the insulating tube 3 are pulled away from each other, the protruding end of the barb 21 abuts against the wall of the second groove 31, preventing the reducer sleeve 2 and the insulating tube 3 from separating. In order to prevent the reducer sleeve 2 and the insulating tube 3 from being restricted in the forward direction when they are inserted into each other, the insulating tube 3 is stepped, and the position of the reducer sleeve 2 is limited by the steps. That is, the steps of the insulating tube 3 limit the forward movement of the reducer sleeve 2, and the barb 21 on the reducer sleeve 2 just slides into the second groove 31 of the insulating tube 3, so that the reducer sleeve 2 cannot separate from the insulating tube 3 in both axial directions of the insulating tube 3.

[0051] The second groove 31 of the insulating tube 3 is provided on the outer circumference of the insulating tube 3. The second groove 31 is a circumferential annular groove, or the second groove 31 is one or more discrete grooves and matches the barb 21 of the reducer sleeve 2. The barb 21 of the reducer sleeve 2 is an inwardly protruding barb 21.

[0052] In order to conveniently and securely connect the reducer sleeve 2 and the insulating tube 3, and also to conveniently separate the reducer sleeve 2 and the insulating tube 3 when needed, the insulating tube 3 has a second groove 31 disposed on its outer periphery. The barbs 21 of the reducer sleeve 2 are inwardly protruding barbs 21. Thus, the operator can see the barbs 21 from the outside and pull the barbs 21 outward, causing the inwardly protruding end of the barbs 21 to disengage from the second groove 31 of the insulating tube 3. This allows the groove wall of the second groove 31 to no longer restrict the barbs 21 of the reducer sleeve 2, thereby enabling the reducer sleeve 2 and the insulating tube 3 to be relatively separated. In order to conveniently connect the reducer sleeve 2 and the insulating tube 3, the second groove 31 on the insulating tube 3 is a circumferential annular groove. Since the second groove 31 is a complete annular groove, once the reducer sleeve 2 and the insulating tube 3 are axially inserted into each other, the barbs 21 on the reducer sleeve 2 can slide into the second groove 31 of the insulating tube 3, thereby connecting the reducer sleeve 2 and the insulating tube 3. Combine Figure 2 、 6 As shown, this embodiment adopts a solution in which the second groove 31 is a complete annular groove, and the annular groove is a tapered groove. After the reducer sleeve 2 is installed, the head is the front and the tail is the rear. The depth of the groove bottom gradually decreases from front to rear along the axial direction of the insulating tube 3.

[0053] Alternatively, in order to enhance the strength of the insulating tube 3, the second groove 31 on the insulating tube 3 is one or more discretely arranged grooves. In this way, the circumferential position of the second groove 31 on the insulating tube 3 is not a complete ring, and the tube wall at the position where there is no second groove 31 on the insulating tube 3 is thicker, thereby enhancing the strength of the insulating tube 3. At the same time, the second groove 31 on the insulating tube 3 matches the barb 21 of the reducer sleeve 2. When the reducer sleeve 2 and the insulating tube 3 are axially inserted into each other, that is, the step of the insulating tube 3 limits the advancement of the reducer sleeve 2, if the barb 21 on the reducer sleeve 2 does not slide into the second groove 31 of the insulating tube 3 at this time, it is only necessary to rotate the reducer sleeve 2 circumferentially along the insulating tube 3 to make the barb 21 on the reducer sleeve 2 slide into the second groove 31 of the insulating tube 3, thereby realizing the connection between the reducer sleeve 2 and the insulating tube 3.

[0054] When there is one barb 21 on the reducer sleeve 2, there is one second groove 31 on the insulating tube 3, and the length of the second groove 31 along the circumference of the insulating tube 3 is adapted to the length of the barb 21 along the circumference of the reducer sleeve 2, or the former is greater than the latter to a certain extent, for example, the former is 2 times, 3 times or other multiples of the latter.

[0055] When there are multiple barbs 21 distributed circumferentially on the reducer sleeve 2, there are multiple second grooves 31 distributed circumferentially along the insulating tube 3, and the positions of the multiple second grooves 31 correspond one-to-one to the positions of the multiple barbs 21. Alternatively, adjacent second grooves 31 can be merged and connected so that the number of second grooves 31 is less than the number of barbs 21, but all barbs 21 should be able to slide into the second grooves 31. For example, there are 4 barbs 21, which are evenly distributed circumferentially along the reducer sleeve 2, and the number of second grooves 31 is 2. Each second groove 31 occupies a quarter of the circumferential length of the insulating tube 3 or is slightly longer than one of the four lengths. Such a second groove 31 setting can enhance the strength of the insulating tube 3 at the second groove 31.

[0056] The barb 21 is dovetail-shaped, rectangular, triangular or trapezoidal, wherein the size of the end of the barb 21 facing the head of the reducer sleeve 2 is greater than or equal to the size of the end of the barb 21 facing the tail of the reducer sleeve 2. Figure 5 As shown, the barb 21 is dovetail-shaped. A through-hole is provided on the barb 21 for hooking and pulling the barb 21 with a tool. To separate the reducer sleeve 2 and the insulating tube 3, the tool is inserted into the through-hole, hooked into the barb 21, and pulled outward, disengaging the inwardly protruding end of the barb 21 from the second groove 31 of the insulating tube 3.

[0057] The tail portion of the reducer sleeve 2 is at least twice as long as the head portion. Since the head portion of the reducer sleeve 2 is connected to the tail portion of the filter tube 1, which is then connected to the insulating tube 3, and the filter tube 1 is relatively long, to enhance the strength of the reducer sleeve 2, the tail portion where the reducer sleeve 2 and the insulating tube 3 meet is 2-3 times the head portion length. Furthermore, the barbs 21 on the reducer sleeve 2 are located in the middle of the tail portion or in the front half of the tail portion. In this embodiment, the tail portion where the reducer sleeve 2 and the insulating tube 3 meet is twice the head portion length.

[0058] In order to install the outlet pipe 4 in the filter tube 1 and block the pipe opening of the filter tube 1 so that the filter material in the filter tube 1 cannot leak out from the end of the filter tube 1 away from the insulating tube 3, that is, the head of the filter tube 1, in the present invention, the pipe assembly also includes an end cap 5. Figure 1 、 3 As shown in Figures 4 and 5, the end cap 5 is annular, and the outer diameter of a portion of the end cap 5 is adapted to the inner diameter of the filter tube 1, so that this portion of the end cap 5 can extend into the end of the filter tube 1 away from the insulating tube 3, that is, this portion of the end cap 5 extends into the head end of the filter tube 1. The end cap 5 is also provided with a center hole, through which the outlet pipe 4 passes and into the filter tube 1. The outer diameter of the outlet pipe 4 matches the diameter of the center hole of the end cap 5, so that the outlet pipe 4 can pass through the center hole of the end cap 5 without causing the filter material in the filter tube 1 to leak out of the gap between the outlet pipe 4 and the center hole of the end cap 5.

[0059] The tail of the water outlet pipe 4, the portion that penetrates the filter tube, is also provided with barbs. Correspondingly, a third groove 32 is also provided on the outer periphery of the head of the insulating tube 3. The barbs of the water outlet pipe 4 cooperate with the third groove 32 at the head of the insulating tube 3 to connect the tail of the water outlet pipe 4 to the head of the insulating tube 3. Alternatively, the tail of the water outlet pipe 4 extends all the way to the tail of the filter tube and abuts against the step of the insulating tube 3. At the same time, the water outlet pipe 4 is also sleeved on the outside of the portion of the insulating tube 3 that extends into the filter tube 1. A barb is provided in the middle of the water outlet pipe 4. The barb in the middle of the water outlet pipe 4 cooperates with the third groove 32 at the head of the insulating tube 3 to connect the water outlet pipe 4 to the head of the insulating tube 3. Since the water outlet pipe 4 extends all the way to the tail of the filter tube 1, the sleeve portion of the water outlet pipe 4 and the insulating tube 3 is increased, the support surface is increased, and the overall strength is enhanced. The barb of the outlet pipe 4 is provided in the same manner as the barb on the reducer sleeve, and the third groove 32 at the head of the insulating tube 3 is provided in the same manner as the second groove 31 on the insulating tube 3 .

[0060] The head and tail described in the utility model are defined as the front and the back in the axial direction from the water outlet pipe to the insulating tube after the various parts are assembled. The water outlet pipe is in the front and the insulating tube is in the back. The front part of each part is the head and the back part is the tail.

[0061] A circumferential first groove 51 is provided on the periphery of the end cover 5. With the first groove 51 as the boundary, the outer diameter of the end cover 5 on one side of the first groove 51 is smaller than the inner diameter of the filter tube 1 and this part extends into the head port of the filter tube 1, and the outer diameter of the end cover 5 on the other side of the first groove 51 is larger than the outer diameter of the filter tube 1 and is located outside the filter tube 1.

[0062] In order to enable the end cap 5 to effectively block one end of the filter tube 1 and to enable the end cap 5 to be effectively connected to the filter tube 1 and not fall off, in the present invention, the end cap 5 is set to a stepped shape with different outer diameters, and a circumferential first groove 51 is set on the periphery of the end cap 5. With the first groove 51 as the boundary, the outer diameter of the end cap 5 part on one side of the first groove 51 is smaller than the inner diameter of the filter tube 1 and this part extends into the head port of the filter tube 1, while the outer diameter of the end cap 5 part on the other side of the first groove 51 is larger than the outer diameter of the filter tube 1 and is located outside the filter tube 1. In this way, the port of the filter tube 1 is blocked by the part of the end cap 5 with an outer diameter larger than the outer diameter of the filter tube 1, and the part of the end cap 5 with an outer diameter smaller than the inner diameter of the filter tube 1 is located inside the filter tube 1 to provide a sufficient support surface, and as Figure 3 As shown, the edge of the head port of the filter tube 1 is inwardly bent, and the inwardly bent edge of the filter tube 1 is embedded in the first groove 51 of the end cover 5 so that the end cover 5 and the filter tube 1 can be effectively connected and will not fall off easily.

[0063] The present invention also provides a water heater having the aforementioned pipe fitting combination. By adopting the aforementioned pipe fitting combination, even if different models of water heaters employ filter tubes 1 of different diameters, suitable reducer sleeves can be used to match insulating tubes of the same diameter without the need to redesign molds for insulating tubes of different diameters, thereby reducing the overall manufacturing cost and improving efficiency of different models of water heaters.

[0064] The utility model provides a reducer sleeve, a pipe fitting combination, and a water heater, wherein the reducer sleeve includes a head and a tail, and the head and tail of the reducer sleeve are connected by a reducing portion; the tail of the reducer sleeve is provided with barbs. The pipe fitting combination includes a filter tube, an insulating tube, and a reducer sleeve. The diameter of the head of the reducer sleeve matches the diameter of the filter tube, and the head of the reducer sleeve is connected to the filter tube; the diameter of the tail of the reducer sleeve matches the diameter of the insulating tube, and the tail of the reducer sleeve is connected to the insulating tube. By providing a reducer sleeve to connect the filter tube and the insulating tube, the size of the insulating tube can be fixed in the case of different product models. By simply changing the size of the head of the reducer sleeve through the process of reducing the diameter of the reducer sleeve, the filter tubes with different diameters can be adapted, thereby achieving uniform adaptability of different filter tube modules to the insulating tube module. By simply selecting a smaller component, a reducer sleeve, of different diameters, the assembly of filter tubes and insulating tubes of different diameters can be achieved. This allows the insulation tubes of different models of products to have the same diameter, while the filter tubes need to have different diameters. Modular assembly can be achieved by simply adding a suitable reducer sleeve, avoiding the large-scale operation of changing the sizes of other parts such as the insulating tube, reducing design costs, and achieving the versatility of other parts. In addition, this pipe combination has fewer parts as a whole and has improved strength, reducing costs and assembly difficulty, and improving production efficiency.

[0065] 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. Reducer sleeve, characterized by: The reducer sleeve comprises a head and a tail, wherein the head and the tail of the reducer sleeve are connected via a reducing portion; and the tail of the reducer sleeve is provided with barbs.

2. The reducer sleeve according to claim 1, characterized in that: The barbs of the reducer sleeve are barbs protruding inwards.

3. The reducer sleeve according to claim 1 or 2, characterized in that: The barb is dovetail-shaped, rectangular, triangular or trapezoidal, wherein the dimension of one end of the barb facing the head of the reducer sleeve is greater than or equal to the dimension of one end of the barb facing the tail of the reducer sleeve.

4. A pipe fitting assembly, characterized in that: It comprises a filter tube, an insulating tube and the reducer sleeve according to any one of claims 1 to 3, The diameter of the reducer sleeve head matches the diameter of the filter tube, and the reducer sleeve head is connected to the tail of the filter tube; The diameter of the tail end of the reducer sleeve matches the diameter of the insulating tube, and the tail end of the reducer sleeve is connected to the insulating tube.

5. A pipe fitting assembly according to claim 4, characterized in that: Also includes end caps and outlet pipes, The end cover is annular and has a center hole. A portion of the end cover is adapted to the diameter of the filter tube and extends into the head port of the filter tube. The outlet pipe penetrates the filter tube from the center hole of the end cover.

6. The pipe assembly according to claim 5, 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 port 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.

7. The pipe assembly according to claim 6, characterized in that: The edge of the first port of the filter tube is inwardly buckled, and the inwardly buckled portion is embedded in the first groove of the end cover.

8. A pipe fitting assembly according to any one of claims 4 to 7, characterized in that: A second groove is provided on the insulating tube. When the reducer sleeve is connected to the insulating tube, the barbs of the reducer sleeve are stuck in the second groove of the insulating tube.

9. The pipe fitting assembly according to claim 8, characterized in that: The second groove of the insulating tube is arranged on the outer periphery of the insulating tube; the second groove is a circumferential annular groove, or the second groove is one or more discrete grooves and matches the barbs of the reducer sleeve.

10. A water heater, characterized in that: A pipe fitting combination according to any one of claims 4 to 9.

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