Expansion tank

Abstract

The utility model relates to the technical field of refrigerating systems, in particular to an expansion tank. The expansion tank comprises a tank body, a balloon and a flange assembly, the balloon is installed in the tank body, a cavity is formed in the balloon, the balloon and the tank body are coaxially arranged, the balloon is provided with an inner side close to the axis direction and an outer side away from the axis direction, the balloon is provided with an opening, and the side wall, forming the opening, of the balloon is bent towards the radial outer side to form a first turned edge; a convex rib is arranged on the side face, away from the cavity, of the first turned-over edge in a protruding mode, the flange assembly is connected with the first turned-over edge, and the convex rib abuts against the flange assembly in an interference mode. The flange assembly has the advantages that deformation is generated after the convex rib abuts against the flange assembly in an interference mode, and therefore the gap between the flange assembly and the first flanging can be filled with the convex rib, the leakproofness between the flange assembly and the first flanging is improved, and the problem of medium leakage is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration systems, and particularly to an expansion tank. Background Art

[0002] An expansion tank generally includes a tank body and a balloon. The balloon is arranged in the tank body, and there is gas (such as nitrogen) between the balloon and the tank body. When pressurized water from the outside enters the balloon of the expansion tank, the gas between the balloon and the tank body is compressed. After being compressed, the volume of the gas becomes smaller and the pressure increases until the gas pressure is the same as the water pressure and the water inlet stops. When the water loses pressure and the pressure decreases, the gas pressure is greater than the water pressure. At this time, the gas generates pressure to squeeze the water in the balloon out and flow to the external pipeline.

[0003] The balloon usually has a port extending out of the tank body, and there is a flanging at the port. The existing sealing structure is formed by two upper and lower flanges squeezing the axial sides of the flanging, but the sealing performance is insufficient and leakage problems are still likely to occur. Summary of the Utility Model

[0004] In view of the above technical problems, the utility model provides an expansion tank.

[0005] An expansion tank includes: a tank body; a balloon installed in the tank body. The interior of the balloon is configured with a cavity. The balloon and the tank body are coaxially arranged, and the balloon has an inner side close to the axis direction and an outer side far from the axis direction. The balloon has an opening, and the side wall of the balloon forming the opening is bent towards the radial outside to form a first flanging. A rib is convexly provided on the side of the first flanging away from the cavity; a flange assembly is connected to the first flanging, and the rib is in interference contact with the flange assembly.

[0006] With such a setting, the rib deforms after being in interference contact with the flange assembly. Therefore, the rib can fill the gap between the flange assembly and the first flanging, thereby improving the tightness between the flange assembly and the first flanging to prevent the problem of medium leakage.

[0007] In one embodiment, the rib is arranged along the circumferential direction of the first flanging to form an annular protrusion.

[0008] In one embodiment, the tank body is provided with a through hole, and one end of the balloon having an opening extends out of the through hole; the edge of the tank body forming the through hole is bent towards the radial outside to form a second flanging, and the second flanging abuts against the side of the first flanging opposite to the rib.

[0009] In one embodiment, the flange assembly includes a first flange and a second flange. The first flange abuts against the side of the first flanging facing away from the tank body and is in interference fit with the rib. The second flange abuts against the side of the second flanging facing away from the first flanging, and the first flange and the second flange are connected by a plurality of connecting members.

[0010] In one embodiment, a plurality of bosses are provided on the side of the first flange facing the second flange. The bosses protrude towards the second flange, and at least one boss abuts against the first flanging.

[0011] In one embodiment, the bosses are arranged at intervals along the radial direction to form a first boss close to the inner side and a second boss close to the outer side.

[0012] In one embodiment, the first boss is arranged circumferentially along the inner edge of the opening to form an annular structure and abuts against the inner edge of the opening; the second bosses are multiple and are uniformly arranged at intervals around the axis of the first flange. Along the radial direction of the first flange, the second bosses are spaced from the outer peripheral side of the first flanging by a first preset distance, and the first preset distance is less than the deformation amount of the first flanging towards the radial outer side.

[0013] In one embodiment, a slope is formed on the edge of the opening. An abutting surface is provided on the circumferential outer side of the first boss close to the second boss, and the abutting surface is correspondingly inclined with the slope, and the slope abuts against the abutting surface.

[0014] In one embodiment, the outer side in the axial direction of the first flange bends towards the second flange to form a third flanging, and the third flanging abuts against the second flange.

[0015] In one embodiment, a drain hole is formed in the third flanging, and the drain hole penetrates through the third flanging.

[0016] Compared with the prior art, in the present utility model, by adding a rib on the first flanging at the opening of the balloon, the rib abuts against the first flange to achieve an effect similar to that of a sealing ring, so as to improve the connection sealing performance between the balloon and the flange assembly and avoid the problem of medium leakage. And the first flange and the second flange respectively abut against the first flanging of the balloon and the second flanging of the tank body. When the second flange presses towards the first flange, stress acts on the tank body with higher structural strength, so as to avoid damaging the balloon and extend the service life of the expansion tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural cross-sectional view of one embodiment of the expansion tank provided by the present utility model;

[0018] Figure 2 Schematic structural diagram of the balloon of one embodiment of the expansion tank provided by the present utility model;

[0019] Figure 3 Schematic structural diagram of the first flange of one embodiment of the expansion tank provided by the present utility model.

[0020] The meanings of the symbols in the figure are as follows:

[0021] 100. Expansion tank; 10. Tank body; 11. Through hole; 12. Second flanging; 20. Balloon; 21. Cavity; 22. Opening; 221. Inclined plane; 23. First flanging; 231. Rib; 30. Flange assembly; 31. First flange; 311. First boss; 3111. Contact surface; 312. Third flanging; 3121. Drain port; 313. Second boss; 314. Connection hole; 32. Second flange. Detailed implementation manners

[0022] In order 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 with reference to 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.

[0023] 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.

[0024] 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, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0026] 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.

[0027] The present utility model provides an expansion tank 100, which includes a balloon 20 and a tank body 10. An interference fit is achieved between a convex rib 231 protruding from an opening 22 of the balloon 20 and a flange assembly 30 to improve the sealing performance between the balloon 20 and the flange assembly 30.

[0028] It should be explained that the working principle of the expansion tank 100 is as follows: There is gas between the tank body 10 and the balloon 20. When pressurized water from the outside enters the balloon 20 in the expansion tank 100, the gas between the balloon 20 and the tank body 10 is compressed. After being compressed, the volume of the gas becomes smaller and the pressure increases until the gas pressure is the same as the water pressure and the water inlet stops. When the water loses pressure and the pressure decreases, the gas pressure is greater than the water pressure. At this time, the gas expands to squeeze the water in the balloon 20 out and flow to the external pipeline.

[0029] Please refer to Figures 1 - 3 , the expansion tank 100 provided by the present utility model includes a tank body 10, a balloon 20 and a flange assembly 30. The balloon 20 is installed inside the tank body 10. The interior of the balloon 20 is configured with a cavity 21. The balloon 20 and the tank body 10 are coaxially arranged, and the balloon 20 has an inner side close to the axis direction and an outer side far from the axis direction. The balloon 20 has an opening 22. The side wall of the balloon 20 forming the opening 22 bends towards the radial outside to form a first flanging 23. A convex rib 231 protrudes from one end of the first flanging 23 away from the cavity 21. The flange assembly 30 is connected to the first flanging 23, and the convex rib 231 is in interference contact with the flange assembly 30.

[0030] In this way, after the convex rib 231 is in interference contact with the flange assembly 30, the convex rib 231 deforms to achieve the effect of a sealing ring, and can fill the gap between the flange assembly 30 and the first flanging 23, thereby improving the tightness between the flange assembly 30 and the first flanging 23 to prevent the problem of medium leakage.

[0031] Preferably, the convex rib 231 is made of a soft material, such as rubber, so as to generate a greater deformation to fill the gap during the interference fit to improve the sealing performance.

[0032] Furthermore, the convex rib 231 is arranged along the circumferential direction of the first flanging 23 to form an annular protrusion. The annular protrusion structure can enable the convex rib 231 to form a circumferential contact effect with the flange assembly 30, so as to ensure that there are sealing stop structures in all directions between the convex rib 231 and the flange assembly 30 to optimize the sealing effect.

[0033] It can be understood that in other embodiments, the convex rib 231 may not be arranged in a complete circle circumferentially, but may be arranged separately at positions and angles with high leakage risks. In this way, consumables can be saved, and the convex rib 231 has more deformation space.

[0034] The tank body 10 is provided with a through hole 11. One end of the balloon 20 having an opening 22 extends out of the through hole 11. The edge of the tank body 10 forming the through hole 11 is bent radially outward to form a second flanging 12. The second flanging 12 abuts against the side of the first flanging 23 facing away from the convex rib 231. In this way, the second flanging 12 and the first flanging 23 increase the connection area, improve the contact area between the port of the tank body 10 and the port of the balloon 20, and thus improve the connection tightness.

[0035] Furthermore, the flange assembly 30 includes a first flange 31 and a second flange 32. The first flange 31 abuts against the side of the first flanging 23 facing away from the tank body 10 and is in interference fit with the convex rib 231. The second flange 32 abuts against the side of the second flanging 12 facing away from the first flanging 23, and the first flange 31 and the second flange 32 are connected by a plurality of connecting members.

[0036] In this embodiment, the connecting member is a bolt, and in other embodiments, structures such as pins and screws can also be used.

[0037] Define the side of the tank body 10 where the through hole 11 is opened as the lower side, and the end of the tank body 10 far from the through hole 11 as the upper side. Therefore, the first flange 31 and the second flange 32 respectively abut against the upper side of the second flanging 12 and the lower side of the first flanging 23, providing pressing forces from the upper and lower directions to ensure the connection strength between the flange assembly 30, the balloon 20, and the tank body 10. And because the second flange 32 is pressed against the second flanging 12, that is to say, the second flange 32 is pressed against the tank body 10. Compared with the prior art where the second flange 32 is usually pressed against the first flanging 23 (i.e., the balloon 20), the structural strength of the tank body 10 is much greater than that of the balloon 20. Therefore, although the second flange 32 and the tank body 10 are prone to form a line contact with a relatively large pressure due to their 90°-angled mating structure during the pressing process, the tank body 10 can still ensure durability and structural strength, avoiding damage to the balloon 20 caused by the second flange 32 being pressed against the balloon 20.

[0038] Preferably, in other embodiments, a groove (not shown in the figure) may also be provided on the first flange 31. The groove is correspondingly arranged with the rib 231, and the groove width of the groove along the radial direction of the first flange 31 is smaller than the thickness of the rib 231, that is, the groove and the rib 231 are still in interference fit to further improve the sealing effect.

[0039] On the side of the first flange 31 facing the second flange 32, there are a plurality of bosses. The bosses protrude towards the second flange 32, and at least one boss abuts against the first flanging 23. In this way, in addition to the abutment between the rib 231 and the first flange 31, the above-mentioned abutment structure between the boss and the first flanging 23 can also increase the sealing effect.

[0040] Furthermore, the bosses are arranged at intervals along the radial direction to form a first boss 311 close to the inner side and a second boss 313 close to the outer side. In this way, a depression will naturally form between the first boss 311 and the second boss 313. The depression can accommodate the first flanging 23, making the fit between the flange assembly 30 and the balloon 20 tighter. In addition, the first boss 311 and the second boss 313 can also improve the torsional strength of the first flange 31.

[0041] In this embodiment, the first flanging 23 and the first boss 311 form a surface contact abutment effect. In other embodiments, the first flanging 23 can also abut against both the first boss 311 and the second boss 313 simultaneously to further improve the sealing effect.

[0042] Further, the first boss 311 is circumferentially arranged along the inner edge of the opening 22 to form an annular structure and abuts against the inner edge of the opening 22; there are multiple second bosses 313, which are evenly spaced and arranged in a circumferential manner along the axial direction of the first flange 31. Along the radial direction of the first flange 31, the second bosses 313 are spaced from the outer peripheral side of the first flanging 23 by a first preset distance, and the first preset distance is less than the deformation amount of the first flanging 23 toward the radially outer side. In this way, the first boss 311 forming the annular structure and the first flanging 23 can form a circumferential abutting and sealing effect, increasing the contact area between the first boss 311 and the first flanging 23 to further improve the sealing performance. Since the material of the balloon 20 is relatively soft, elastic deformation will occur during the abutting process between the first flanging 23 and the first flange 31, so there will be inward and outward deformations in the radial direction. The deformation of the first flanging 23 toward the radially inner side abuts against the first boss 311, so its deformation direction will tend to be toward the radially outer side. The first preset distance provides space for its deformation and enables it to abut against the second bosses 313 after deformation to improve the sealing effect.

[0043] After the multiple second bosses 313 are arranged at intervals, there can be a space for processing and assembly between two adjacent second bosses 313. In this embodiment, a connection hole 314 is formed between every two adjacent second bosses 313, and a connecting piece passes through the connection hole 314 and is respectively connected to the first flange 31 and the second flange 32 at both ends, thereby strengthening the connection between the first flange 31 and the second flange 32 and improving the overall structural strength of the flange assembly 30.

[0044] Specifically, the edge of the opening 22 is configured with an inclined surface 221. The abutting surface 3111 is provided on the circumferential outer side of the first boss 311 close to the second boss 313, and the abutting surface 3111 is correspondingly inclined with the inclined surface 221 (that is, the slope of the abutting surface 3111 relative to the axis of the tank body 10 is the same as the slope of the inclined surface 221 relative to the axis of the tank body 10), and the inclined surface 221 abuts against the abutting surface 3111. In this way, the abutting between the first flanging 23 and the first boss 311 is closer, and the tendency of the two to move toward each other can make the abutting surface 3111 and the inclined surface 221 fit more closely, and the sealing performance is better.

[0045] The axially outer side of the first flange 31 is bent toward the second flange 32 to form a third flanging 312, and the third flanging 312 abuts against the second flange 32. In this way, the abutting between the third flanging 312 and the second flange 32 fixes the spacing distance between the first flange 31 and the second flange 32, facilitating assembly. When fixed by a connecting piece, the first flange 31 and the second flange 32 are uniformly stressed and convenient to operate.

[0046] Further, a drain port 3121 is provided on the third flanging 312, and the drain port 3121 penetrates through the third flanging 312. In this way, considering the actual installation of the expansion tank 100 in the unit, the third flanging 312 is arranged upward (that is, the expansion tank 100 is arranged according to Figure 1 placement), and it is easy to store water on the first flange 31 with the third flanging 312 provided. If water is stored for a long time, it is easy to cause the flange assembly 30 to rust and affect its durability. Therefore, adding a drain groove can greatly reduce the rust risk and extend the service life of the expansion tank 100.

[0047] Compared with the prior art, the present utility model adds a rib 231 on the first flanging 23 at the opening 22 of the balloon 20, and makes the rib 231 abut against the first flange 31 to achieve an effect similar to that of a sealing ring, so as to improve the connection sealing performance between the balloon 20 and the flange assembly 30 and avoid the problem of medium leakage. Moreover, the first flange 31 and the second flange 32 respectively abut against the first flanging 23 of the balloon 20 and the second flanging 12 of the tank body 10. When the second flange 32 presses tightly towards the first flange 31, stress acts on the tank body 10 with higher structural strength, thus avoiding damage to the balloon 20 and extending the service life of the expansion tank 100.

[0048] 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 recorded in this specification.

[0049] The above-described embodiments only represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be understood as a limitation to 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 utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. An expansion tank, characterized in that: include: Tank body (10); A balloon (20) is installed in the tank body (10), the interior of the balloon (20) is configured with a cavity (21), the balloon (20) is coaxially arranged with the tank body (10), and the balloon (20) has an inner side close to the axial direction and an outer side away from the axial direction, the balloon (20) has an opening (22), and the side wall of the balloon (20) forming the opening (22) is bent toward the radial outer side to form a first flange (23), and a convex rib (231) is convexly provided on the side of the first flange (23) away from the cavity (21); The flange assembly (30) is connected to the first flange (23), and the convex rib (231) is in interference contact with the flange assembly (30).

2. The expansion tank according to claim 1, characterized in that: The convex rib (231) is arranged along the circumference of the first flange (23) to form an annular protrusion.

3. The expansion tank according to claim 1, characterized in that: The tank body (10) is provided with a through hole (11), and one end of the balloon (20) having an opening (22) protrudes from the through hole (11); The edge of the can body (10) forming the through hole (11) is bent radially outward to form a second flange (12), and the second flange (12) abuts against a side of the first flange (23) facing away from the rib (231).

4. The expansion tank according to claim 3, characterized in that: The flange assembly (30) comprises a first flange (31) and a second flange (32), wherein the first flange (31) abuts against the side of the first flange (23) facing away from the tank body (10) and is interference fit with the rib (231), and the second flange (32) abuts against the side of the second flange (12) facing away from the first flange (23), and the first flange (31) and the second flange (32) are connected by a plurality of connecting pieces.

5. The expansion tank according to claim 4, characterized in that: A plurality of bosses are provided on a side of the first flange (31) facing the second flange (32), the bosses protrude toward the second flange (32), and at least one boss abuts against the first flange (23).

6. The expansion tank according to claim 5, characterized in that: The bosses are arranged at intervals along the radial direction to form a first boss (311) close to the inner side and a second boss (313) close to the outer side.

7. The expansion tank according to claim 6, characterized in that The first boss (311) is circumferentially arranged along the inner edge of the opening (22) to form an annular structure, and abuts against the inner edge of the opening (22); There are multiple second bosses (313), which are evenly spaced and arranged around the axial direction of the first flange (31). Along the radial direction of the first flange (31), the second bosses (313) are spaced apart from the outer peripheral side of the first flange (23) by a first preset distance, and the first preset distance is smaller than the deformation of the first flange (23) toward the radial outside.

8. The expansion tank according to claim 7, characterized in that The edge of the opening (22) is constructed with a slope (221); the first boss (311) is provided with a contact surface (3111) on the circumferential outer side close to the second boss (313); the contact surface (3111) is inclined corresponding to the slope (221), and the slope (221) contacts the contact surface (3111).

9. The expansion tank according to claim 4, characterized in that: The axial outer side of the first flange (31) is bent toward the second flange (32) to form a third flange (312), and the third flange (312) is in abutment with the second flange (32).

10. The expansion tank according to claim 9, characterized in that The third flange (312) is provided with a drainage opening (3121), and the drainage opening (3121) passes through the third flange (312).

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