Expansion tank connecting structure and expansion tank

Abstract

The utility model provides an expansion tank connecting structure and an expansion tank, the expansion tank comprises an upper tank body and a lower tank body, the open end of the upper tank body and the open end of the lower tank body are connected through the connecting structure to form a cylindrical tank body, and inflection points, in contact with a bag body, on the inner side face of the connecting structure are in smooth fillet transition. According to the expansion tank connecting structure, the smooth transition fillets are arranged in the expansion tank, and friction damage easily generated by a capsule in the expansion tank is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of expansion tanks, and particularly relates to a connection structure of an expansion tank. Background Art

[0002] An expansion tank includes an upper tank body and a lower tank body. The lower end of the upper tank body and the upper end of the lower tank body are both completely open ends. The lower end of the upper tank body and the upper end of the lower tank body are butted against each other to form a closed cylindrical tank body. In the existing structure of the expansion tank, the upper tank body and the lower tank body are connected in a lapping form, and one tank body is partially inserted into the other tank body. When the expansion tank is working, as the water demand or pressure in the system changes, the internal bladder of the expansion tank will expand or contract. Since the end face and the inner side face of the open end of the lower tank body and the upper tank body are connected with a right-angle transition, the inner insertion and lapping form of the upper tank body and the lower tank body will cause a convex part to be formed at the right-angle transition inside the expansion tank. During the expansion process of the bladder, it will rub against the convex part, and long-term rubbing will cause the bladder to rupture, resulting in product failure. Content of the Utility Model

[0003] Aiming at the above problems, the utility model provides a connection structure of an expansion tank.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A connection structure of an expansion tank, the expansion tank includes an upper tank body and a lower tank body. The open ends of the upper tank body and the lower tank body are connected into a cylindrical tank body through a connection structure. The inflection points on the inner side face of the connection structure that are in contact with the bladder are all smoothly rounded transitions.

[0006] With such a setting, all the inflection points on the inner side face of the connection structure that are in contact with the bladder are smoothly rounded transitions, so that the friction force at the contact part between the bladder and the connection structure of the upper tank body and the lower tank body is very small, thus avoiding the rupture of the bladder caused by friction.

[0007] Furthermore, the connection structure includes an upper tank body docking part and a lower tank body docking part. Both the upper tank body docking part and the lower tank body docking part are extension rings extending away from the expansion tank. The lower end face of the upper tank body docking part and the inner side face of the lower port of the upper tank body are connected through a smooth rounded transition. The upper end face of the lower tank body docking part and the inner side face of the upper port of the lower tank body are connected through a smooth rounded transition. The opposite faces of the upper tank body docking part and the lower tank body docking part are fixedly connected. With such a setting, there are no protruding sharp corners on the inner side face of the connection structure. The connection between the upper tank body docking part and the upper connection part and the connection between the lower tank body docking part and the lower tank body are not only rounded transitions, but also these connection parts are located on the inner side face of the expansion tank near the outside of the tank body, reducing the contact area and friction force between the bladder and the inner side of the connection structure, and better avoiding the rupture of the bladder due to long-term friction.

[0008] Further, the upper tank docking portion is formed by bending the side wall at the lower end of the upper tank away from the expansion tank, and the lower tank docking portion is formed by bending the side wall at the upper end of the lower tank away from the expansion tank. The radial widths of the upper tank docking portion and the lower tank docking portion are the same, and the widths of the upper tank docking portion and the lower tank docking portion are not less than twice the wall thickness. Preferably, the widths of the upper tank docking portion and the lower tank docking portion are 3 to 4 times the wall thickness. With such a setting, the structural stability of the connection structure and the expansion tank itself is ensured.

[0009] Further, at least two groups of positioning bumps and positioning depressions are provided on the opposite surfaces of the upper tank docking portion and the lower tank docking portion. The positioning bumps and positioning depressions in each group are arranged vertically opposite to each other. The positioning bumps and positioning depressions are adapted to each other and are embedded. With such a setting, the upper tank and the lower tank can be positioned before welding through the embedding connection of multiple groups of positioning bumps and positioning depressions, and at the same time, the positions of the upper tank and the lower tank remain unchanged during the welding process.

[0010] Further, at least two groups of the positioning bumps and positioning depressions are evenly arranged on the outer peripheral side of the expansion tank; the positioning bumps can be of any shape. With such a setting, the docking accuracy of the upper tank and the lower tank is improved.

[0011] Further, the shape of the positioning bump is hemispherical, and its diameter is smaller than the radial width of the docking portion where it is located. The hemispherical positioning bump has a simple structure. With such a setting, the production efficiency can be improved.

[0012] Further, the connection structure includes an upper tank bending portion and a lower tank bending portion. The bending point of the lower tank bending portion is a smooth fillet transition. The lower tank bending portion is located inside the upper tank bending portion, and the outer side surface of the lower tank bending portion is fixedly connected to the inner side surface of the upper tank bending portion; or, the bending point of the upper tank bending portion is a smooth fillet transition. The upper tank bending portion is located inside the lower tank bending portion, and the outer side surface of the upper tank bending portion is fixedly connected to the inner side surface of the lower tank bending portion. With such a setting, the protruding portion is a smooth fillet, and the friction between the bladder and the protruding portion inside the connection structure is small, avoiding the rupture of the bladder due to long-term friction.

[0013] Further, the bending part of the upper tank body includes an inclined part that bends downward and obliquely toward the outside of the expansion tank and a vertical part located at the lower end of the inclined part. The upper part of the inclined part is integrally formed and connected to the lower end surface of the upper tank body; the bending part of the lower tank body is a U-shaped part formed by bending the lower tank body 180° toward the outside of the expansion tank, and the opposite side walls of the two rods of the U-shaped part are closely arranged. One rod of the U-shaped part is integrally formed and connected to the upper end surface of the lower tank body, and the U-shaped part is fixedly connected to the vertical part. With such a setting, the convex part in contact with the capsule on the connection structure is moved to the side of the inner wall of the expansion tank close to the outside of the tank body. At the same time, the convex part is a smooth rounded corner, reducing the contact area and friction force between the capsule and the inner side of the connection structure, and better avoiding the rupture of the capsule due to long-term friction.

[0014] Further, the bending part of the lower tank body includes an inclined part that bends upward and obliquely toward the outside of the expansion tank and a vertical part located at the upper end of the inclined part. The lower end of the inclined part is integrally formed and connected to the upper end surface of the lower tank body; the bending part of the upper tank body is a U-shaped part formed by bending the lower part of the upper tank body 180° toward the outside of the expansion tank, and the opposite side walls of the two rods of the U-shaped part are closely arranged. One rod of the U-shaped part is integrally formed and connected to the lower end surface of the upper tank body, and the U-shaped part is fixedly connected to the vertical part. With such a setting, the convex part in contact with the capsule on the connection structure is moved to the side of the inner wall of the expansion tank close to the outside of the tank body. At the same time, the convex part is a smooth rounded corner, reducing the contact area and friction force between the capsule and the inner side of the connection structure, and better avoiding the rupture of the capsule due to long-term friction.

[0015] An expansion tank, which includes an upper tank body or a lower tank body, and the upper tank body or the lower tank body is connected by the above-mentioned expansion tank connection structure.

[0016] The expansion tank connection structure of the present utility model has a smooth transition rounded corner inside the expansion tank, reducing the friction damage easily generated by the capsule inside the expansion tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the expansion tank connection structure of Embodiment 1 of the present utility model.

[0018] Figure 2 It is Figure 1 the enlarged schematic diagram of part A in

[0019] Figure 3 the schematic structural diagram before the connection structure of Embodiment 1 is connected;

[0020] Figure 4 It is a schematic structural diagram of the expansion tank connection structure of Embodiment 2 of the present utility model;

[0021] Figure 5 It is Figure 4 the enlarged schematic diagram of part B in

[0022] Figure 6 Schematic diagram of the connection structure of Embodiment 3 of the present utility model.

[0023] Wherein, 1 - upper tank body, 2 - lower tank body, 3 - positioning bump, 4 - positioning dimple, 5 - bladder, 6 - inclined part, 7 - vertical part, 8 - U-shaped part, 11 - upper tank body docking part, 21 - lower tank body docking part. Detailed implementation manners

[0024] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0025] It should be noted that when a mechanism is referred to as "fixed to" or "disposed on" another mechanism, it can be directly on the other mechanism or there can also be an intermediate mechanism. When a mechanism is considered to be "connected" to another mechanism, it can be directly connected to the other mechanism or there may be an intermediate mechanism at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the description of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0027] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first feature is in direct contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on the top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under the bottom of" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature has a lower horizontal height than the second feature.

[0028] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items. Embodiment

[0029] As Figures 1 - 3 shown, an expansion tank connection structure, the expansion tank includes an upper tank body 1 and a lower tank body 2, and the open ends of the upper tank body 1 and the lower tank body 2 are connected into a cylindrical tank body through a connection structure. The connection structure includes an upper tank body docking portion 11 and a lower tank body docking portion 21. Both the upper tank body docking portion 11 and the lower tank body docking portion 21 are extension rings extending away from the axis of the expansion tank. The lower end surface of the upper tank body docking portion 11 is connected to the inner side surface of the lower port of the upper tank body 1 through a smooth fillet transition, and the upper end surface of the lower tank body docking portion 21 is connected to the inner side surface of the upper port of the lower tank body 2 through a smooth fillet transition. The opposite surfaces of the upper tank body docking portion 11 and the lower tank body docking portion 21 are fixedly connected. There are no protruding sharp corners on the inner side surface of the connection structure of this embodiment. At the connection between the upper tank body docking portion and the upper connection, and at the connection between the lower tank body docking portion and the lower tank body, not only are both fillet transition designs, but this connection area is located in the area of the inner side surface of the expansion tank, and this area is close to the outer side of the tank body, reducing the contact area and friction between the bladder and the inner side of the connection structure, and better avoiding the rupture of the bladder due to long-term friction.

[0030] In some embodiments, the upper tank body docking portion 11 is formed by bending the lower side wall of the upper tank body 1 away from the expansion tank, and the lower tank body docking portion 21 is formed by bending the upper side wall of the lower tank body 2 away from the axis of the expansion tank. The radial widths of the upper tank body docking portion 11 and the lower tank body docking portion 21 are the same, and the widths of the upper tank body docking portion 11 and the lower tank body docking portion 21 are not less than 2 times the wall thickness, preferably 3 to 4 times the wall thickness. With such a setting, the structural stability of the connection structure and the expansion tank itself is ensured. The angles at which the lower side wall of the upper tank body bends away from the expansion tank and the upper side wall of the lower tank body bends away from the axis of the expansion tank are the same. Those skilled in the art can select the bending angle according to the actual situation. In this example, for the convenience of welding, the bending angle is preferably 90°.

[0031] In some embodiments, a plurality of sets of positioning bumps 3 and positioning dimples 4 are provided on the opposite surfaces of the upper tank docking portion 11 and the lower tank docking portion 21. The positioning bumps 3 and the positioning dimples 4 in each set are arranged vertically opposite to each other, the positioning bumps 3 and the positioning dimples 4 are adapted to each other, and are embedded. The embedded connection of multiple sets of positioning bumps and positioning dimples can accurately fix and limit the relative positions of the upper tank and the lower tank before welding, and ensure the positions of the upper tank and the lower tank remain unchanged during the welding process, facilitating welding and improving work efficiency. The number of sets of positioning bumps and positioning dimples is not less than 2 sets. The multiple sets of positioning bumps 3 and positioning dimples 4 are evenly arranged on the outer peripheral side of the expansion tank, further improving the positioning accuracy of the upper tank and the lower tank. The positioning bumps 3 can be of any shape as long as they can cooperate with the positioning dimples to position the upper tank and the lower tank. Those skilled in the art can select and set according to actual needs. In some other embodiments, the positioning bumps can be hemispherical. The hemispherical positioning bumps have a simple structure, and such a setting can improve production efficiency.

[0032] The size of the hemispherical positioning bumps is determined according to the radial width of the docking portion where it is located and the wall thickness of the tank body of the docking portion where the positioning dimple is located. In principle, its diameter must be smaller than the radial width of the docking portion where it is located.

[0033] An expansion tank, the expansion tank includes an upper tank 1 or a lower tank 2, characterized in that the upper tank 1 or the lower tank 2 is connected by the expansion tank connection structure described in this embodiment. Embodiment

[0034] As Figure 4 and Figure 5 As shown, an expansion tank connection structure, the expansion tank includes an upper tank 1 and a lower tank 2. The open ends of the upper tank 1 and the lower tank 2 are connected by a connection structure to form a cylindrical tank body. The connection structure includes an upper tank bending portion and a lower tank bending portion. The bending point of the lower tank bending portion is a smooth rounded corner transition. The lower tank bending portion is located inside the upper tank bending portion, and the outer side surface of the lower tank bending portion is fixedly connected to the inner side surface of the upper tank bending portion. In some embodiments, the lower tank bending portion is that the upper side wall of the lower tank 2 bends a certain angle towards the outside of the tank body. The size of the angle may not be limited in this application as long as it is the same as the bending angle and bending direction of the connecting part in the upper tank bending portion.

[0035] In some preferred embodiments, the upper tank body bending portion includes an inclined portion 6 that bends downward and obliquely toward the outside of the expansion tank and a vertical portion 7 located at the lower end of the inclined portion 6. The upper part of the inclined portion 6 is integrally formed and connected to the lower end surface of the upper tank body 1; the lower tank body bending portion is a U-shaped portion 8 formed by bending the lower tank body 2 180° toward the outside of the expansion tank, and the opposite side walls of the two side rods of the U-shaped portion 8 are closely arranged. One side rod of the U-shaped portion 8 is integrally formed and connected to the upper end surface of the lower tank body 2, that is, the upper side wall of the lower tank body bending portion bends 90° toward the outside of the tank body. The free end of the outer side rod of the U-shaped portion is fixedly connected to the free end of the vertical portion by welding. With such a setting, the convex portion in contact with the bladder on the connection structure is moved to the side of the inner wall of the expansion tank close to the outside of the tank body. At the same time, the convex portion is a smooth rounded corner, reducing the contact area and friction between the bladder and the inner side of the connection structure, and better avoiding the rupture of the bladder due to long-term friction.

[0036] In some embodiments, the inclination angle of the inclined portion 6 relative to the inner side wall of the upper tank body or the lower tank body is determined according to the side wall thickness of the upper tank body and the lower tank body, ensuring that the outer side wall of the outer side rod of the U-shaped portion 8 is in close contact with the inner side wall of the vertical portion.

[0037] Or, as Figure 6 shown, the structures of the upper tank body bending portion and the lower tank body bending portion are interchanged. The lower tank body bending portion includes an inclined portion 6 that bends upward and obliquely toward the outside of the expansion tank and a vertical portion 7 located at the upper end of the inclined portion 6. The lower end of the inclined portion 6 is integrally formed and connected to the upper end surface of the lower tank body 2; the upper tank body bending portion is a U-shaped portion 8 formed by bending the lower part of the upper tank body 1 180° toward the outside of the expansion tank, and the opposite side walls of the two side rods of the U-shaped portion 8 are closely arranged. One side rod of the U-shaped portion 8 is integrally formed and connected to the lower end surface of the upper tank body 1. The free end of the outer side rod of the U-shaped portion 8 is fixedly connected to the free end of the vertical portion 7 by welding.

[0038] An expansion tank, the expansion tank includes an upper tank body 1 or a lower tank body 2, and the upper tank body 1 or the lower tank body 2 is connected by the expansion tank connection structure described in this embodiment.

[0039] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0040] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. An expansion tank connection structure, the expansion tank includes an upper tank body (1) and a lower tank body (2), and the open ends of the upper tank body (1) and the lower tank body (2) are connected by a connection structure to form a cylindrical tank body, characterized in that, The inflection points on the inner side of the connection structure that contact the bladder (5) are all smoothly rounded.

2. The expansion tank connection structure according to claim 1, characterized in that, The connection structure includes an upper tank docking part (11) and a lower tank docking part (21). Both the upper tank docking part (11) and the lower tank docking part (21) are extension rings extending away from the expansion tank. The lower end face of the upper tank docking part (11) is connected to the inner side of the lower port of the upper tank (1) by a smooth fillet transition. The upper end face of the lower tank docking part (21) is connected to the inner side of the upper port of the lower tank (2) by a smooth fillet transition. The opposite faces of the upper tank docking part (11) and the lower tank docking part (21) are fixedly connected.

3. The expansion tank connection structure according to claim 2, characterized in that, The upper tank docking part (11) is formed by bending the lower side wall of the upper tank (1) away from the expansion tank. The lower tank docking part (21) is formed by bending the upper side wall of the lower tank (2) away from the expansion tank. The upper tank docking part (11) and the lower tank docking part (21) have the same radial width, and the width of the upper tank docking part (11) and the lower tank docking part (21) is not less than twice the wall thickness.

4. The expansion tank connection structure according to claim 3, characterized in that, At least two groups of positioning bumps (3) and positioning dimples (4) are provided on the opposite faces of the upper tank docking part (11) and the lower tank docking part (21). The positioning bumps (3) and positioning dimples (4) in each group are arranged vertically opposite to each other. The positioning bumps (3) and positioning dimples (4) are adapted to each other and are embedded.

5. A connection structure of an expansion tank according to claim 4, characterized in that, At least two groups of the positioning bumps (3) and positioning dimples (4) are evenly arranged on the outer periphery of the expansion tank; the positioning bumps (3) can be of any shape.

6. The expansion tank connection structure according to claim 5, characterized in that, The shape of the positioning bump is hemispherical, and its diameter is smaller than the radial width of the docking part where it is located.

7. The expansion tank connection structure according to claim 1, characterized in that, The connection structure includes an upper tank bending part and a lower tank bending part. The bending point of the lower tank bending part is a smooth fillet transition. The lower tank bending part is located inside the upper tank bending part, and the outer side face of the lower tank bending part is fixedly connected to the inner side face of the upper tank bending part; or, the bending point of the upper tank bending part is a smooth fillet transition. The upper tank bending part is located inside the lower tank bending part, and the outer side face of the upper tank bending part is fixedly connected to the inner side face of the lower tank bending part.

8. A connection structure of an expansion tank according to claim 7, characterized in that, The upper tank bending part includes an inclined part (6) that bends obliquely downward towards the outside of the expansion tank and a vertical part (7) at the lower end of the inclined part (6). The upper part of the inclined part (6) is integrally formed and connected to the lower end face of the upper tank (1); the lower tank bending part is a U-shaped part (8) formed by bending the lower tank (2) 180° towards the outside of the expansion tank. The opposite side walls of the two side rods of the U-shaped part (8) are closely arranged. One side rod of the U-shaped part (8) is integrally formed and connected to the upper end face of the lower tank (2), and the U-shaped part (8) is fixedly connected to the vertical part (7).

9. A connection structure of an expansion tank according to claim 7, characterized in that, The lower tank body bending part includes an inclined part (6) that bends obliquely upward toward the outside of the expansion tank and a vertical part (7) located at the upper end of the inclined part (6). The lower end of the inclined part (6) is integrally formed and connected to the upper end surface of the lower tank body (2); the upper tank body bending part is a U-shaped part (8) formed by bending the lower part of the upper tank body (1) 180° toward the outside of the expansion tank, and the opposite side walls of the two side rods of the U-shaped part (8) are closely arranged. One side rod of the U-shaped part (8) is integrally formed and connected to the lower end surface of the upper tank body (1), and the U-shaped part (8) is fixedly connected to the vertical part (7).

10. An expansion tank, the expansion tank comprising an upper tank body (1) and a lower tank body (2), characterized in that, The upper tank body (1) and the lower tank body (2) are connected by the expansion tank connection structure described in any one of claims 1 to 9.

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