Expansion tank

Abstract

The utility model relates to the field of refrigerating systems, in particular to an expansion tank. The expansion tank comprises a tank body, a balloon and a first flange, a cavity is formed in the tank body, a through hole communicated with the cavity is formed in the axial end of the tank body, the balloon is arranged on the inner side of the tank body, part of the balloon extends out of the tank body from the through hole, the first flange is connected to the end, extending out of the tank body, of the balloon, and the first flange is provided with a flow blocking part. The flow blocking part and the tank body are coaxially arranged, a plurality of circulation holes are formed in the flow blocking part, the area of the circulation holes is smaller than 1 / 2 of the area of the opening of the balloon, and the circulation area formed by the circulation holes is gradually increased in the radial outward direction. The balloon has the advantages that the plurality of circulating holes can dispersedly bear water pressure, so that the flow direction of fluid in the balloon is more uniform, the pressure is uniformly distributed to the inner wall surface of the balloon, the impact of water flow on the balloon is reduced, and the situation that the balloon is damaged due to overhigh water pressure is reduced and prevented.

Description

Technical Field

[0001] The utility model relates to the 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 equal to 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 out and flow to the external pipeline.

[0003] In the existing expansion tank, the connection between the balloon and the external pipeline is generally through flange connection. A flow-through hole is opened on the flange, and water flows into or out of the balloon through the flow-through hole. However, in some cases, the pressure in the waterway suddenly increases. Since the aperture of the flow-through hole is relatively large and is directly connected to the balloon, when the water pressure is relatively large, it cannot play a buffering role through pressure drop and directly impacts the internal balloon, easily causing damage to the balloon. Summary of the Utility Model

[0004] Aiming at the above technical problems, the utility model provides an expansion tank capable of coping with the suddenly increased external water pressure.

[0005] An expansion tank includes: a tank body with a chamber internally constructed, and a through hole communicating with the chamber is opened at the axial end of the tank body; a balloon, part of which is arranged in the chamber 11, and part of the balloon extends out of the tank body from the through hole; a first flange connected to the end of the balloon extending out of the tank body, the first flange having a flow-blocking portion, and a plurality of flow-through holes are opened on the flow-blocking portion. The plurality of communication holes communicate with the inside of the balloon. The area of the plurality of flow-through holes is less than 1 / 2 of the area of the opening of the balloon, and along the radially outward direction, the flow area formed by the flow-through holes gradually increases.

[0006] With such arrangement, the external water in the present application will be stopped by the flow blocking part in the process of flowing to the inside of the balloon, and the flow blocking part will bear the water pressure first. At the same time, the flow blocking part is provided with a flow hole, and the water flow can enter the balloon through the flow hole. Moreover, since there are multiple flow holes, the multiple flow holes increase the pressure of the water flow, and the flow area of ​​the flow hole is smaller than the flow area of ​​the external pipeline. Therefore, due to the reduction of the flow hole diameter, the flow velocity of the water flow increases. According to the Bernoulli principle, the increase in flow velocity leads to a decrease in the water flow pressure. At the same time, the direction of the water flow will also change multiple times, which will increase the energy loss of the water flow, thereby reducing the overall pressure of the water outlet. Moreover, the area of ​​the flow hole is less than 1 / 2 of the opening area of ​​the balloon, thereby ensuring the pressure drop effect of the flow hole on the water flow, ensuring that it will not cause excessive impact on the balloon after the pressure drop caused by the flow blocking hole. The multiple flow holes will also make the flow direction of the fluid in the balloon more uniform, and the pressure will be evenly distributed to the inner wall of the balloon, reducing the impact of the water flow on the balloon, thereby preventing the balloon from being damaged by excessive water pressure. Furthermore, since the flow area formed by the flow holes gradually increases in the radially outward direction, the water pressure can be distributed to various locations of the first flange in the radial direction, thereby improving the water pressure bearing capacity of the first flange.

[0007] In one embodiment, the flow hole includes a first hole and a second hole, the first hole is coaxially arranged with the tank body, and there are a plurality of second holes, which are evenly spaced around the first hole in the circumferential direction.

[0008] In one embodiment, the flow hole further includes a third hole, and the third holes are multiple, and the multiple third holes are all opened on the radial outside of the second hole away from the first hole, and are staggered with the second holes.

[0009] In one embodiment, the first hole, the second hole and the third hole are all configured to be circular.

[0010] In one embodiment, the diameters of the first hole, the second hole and the third hole are the same; or, the diameters of two of the first hole, the second hole and the third hole are the same, and the diameter of the other is smaller than the two with the same diameters; or, the diameter of one of the first hole, the second hole and the third hole is larger than the diameters of the other two.

[0011] In one embodiment, the flow hole also includes a third hole, and the third holes are multiple, and the multiple third holes are all opened on the radial outside of the second hole away from the first hole, and the first hole, the second hole and the third hole are arranged in a straight line along the radial direction of the blocking portion.

[0012] In one embodiment, both the second hole and the third hole are arranged as fan-shaped rings; wherein, the inner and outer sides of the second hole in the radial direction and the inner and outer sides of the third hole in the radial direction are both arc-shaped, and the radian is correspondingly the same as the outer edge of the first hole.

[0013] In one embodiment, the first flange protrudes with an annular boss towards the side of the tank body, and the end of the balloon is sleeved on the outer peripheral side of the annular boss.

[0014] In one embodiment, the end of the balloon extending outside the tank body is folded along the radially outward direction to form a flanging, and the first flange abuts against the flanging.

[0015] In one embodiment, the expansion tank includes a second flange and a connecting member. The second flange abuts against the side of the flanging away from the first flange. The connecting members are multiple and are all passed through and connected to the first flange and the second flange.

[0016] Compared with the prior art, the utility model improves the flow rate of water by opening a plurality of flow holes with reduced apertures on the first flange, reduces the water pressure of the water flow, changes the flow direction of the water flow to increase the energy loss of the water flow, makes the flow direction of the water flow entering the balloon more uniform, evenly distributes the pressure to the inner wall surface of the balloon, reduces the impact of the water flow on the balloon, and thus prevents the balloon from being damaged due to excessive water pressure. Multiple layout positions and opening shapes of the flow holes are set to optimize the sharing of the water pressure by the flow holes. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 It is a structural schematic diagram of one embodiment of the expansion tank provided by the utility model;

[0019] Figure 3 It is a front view of one embodiment of the expansion tank provided by the utility model;

[0020] Figure 4 It is a top view of the first flange of one embodiment of the expansion tank provided by the utility model;

[0021] Figure 5 It is a structural schematic diagram of the first flange of one embodiment of the expansion tank provided by the utility model.

[0022] The meanings represented by the symbols in the figure are as follows:

[0023] 100. Expansion tank; 10. Tank body; 11. Chamber; 12. Through hole; 20. Balloon; 21. Flange; 30. First flange; 301. Flow blocking part; 31. Flow through hole; 311. First hole; 312. Second hole; 313. Third hole; 32. Annular boss; 40. Second flange; 50. Connecting piece. Detailed implementation manners

[0024] 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.

[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 specification 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 indicating 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 may be in direct contact with the second feature "on" or "under" the second feature, or the first feature and the second feature may be in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may 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", "below" and "beneath" the second feature may 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.

[0029] Please refer to Figures 1 - 5 , the present utility model provides an expansion tank 100, which is connected to an external pipeline through a first flange 30, and a flow blocking portion 301 is provided on the first flange 30 to block the water flow, and a plurality of flow through holes 31 are opened on the flow blocking portion 301 for the water flow to pass through, so as to increase the resistance received during the process of the water flow passing through the first flange 30 and flowing into the balloon 20, avoid the direct impact of the water flow on the balloon 20 in the tank body 10, and avoid the damage of the balloon 20.

[0030] The expansion tank 100 includes a tank body 10, a balloon 20 and a first flange 30. A chamber 11 is constructed inside the tank body 10. A through hole 12 communicating with the chamber 11 is opened at the axial end of the tank body 10. The balloon 20 is partially disposed in the chamber 11, and a part of the balloon 20 extends out of the tank body 10 from the through hole 12. The first flange 30 is connected to the end of the balloon 20 extending outside the tank body 10. The first flange 30 has a flow blocking portion 301. The flow blocking portion 301 is coaxially arranged with the tank body 10. A plurality of flow through holes 31 are opened on the flow blocking portion 301. The plurality of flow through holes 31 are all communicated with the inside of the balloon 20. The area of the plurality of flow through holes 31 is less than 1 / 2 of the area of the opening of the balloon 20, and along the radially outward direction, the flow through area formed by the flow through holes 31 gradually increases.

[0031] The working principle of the expansion tank 100 is as follows: The balloon 20 is disposed in the tank body 10, and a gas is provided between the balloon 20 and the tank body 10. 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 rises 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 and flow to the external pipeline.

[0032] Therefore, the external water in the present application will be stopped by the flow blocking part 301 when flowing into the interior of the balloon 20. The flow blocking part 301 first bears the water pressure. At the same time, a flow hole 31 is opened on the flow blocking part 301, and the water flow can enter the balloon 20 through the flow hole 31. Moreover, since there are multiple flow holes 31, the multiple flow holes 31 increase the pressure of the water flow, and the flow area of ​​the flow hole 31 is smaller than the flow area of ​​the external pipeline. Therefore, due to the reduction of the flow hole diameter, the flow velocity of the water flow increases. According to Bernoulli's principle, the increase in flow velocity leads to a decrease in water flow pressure. At the same time, the direction of the water flow will also change many times, which will increase the energy loss of the water flow, thereby reducing the overall pressure of the water outlet. Moreover, the area of ​​the flow hole 31 is less than 1 / 2 of the opening area of ​​the balloon 20, thus ensuring the pressure drop effect of the flow hole 31 on the water flow, ensuring that after the flow through the flow hole 31, the pressure drop will not cause excessive impact on the balloon 20, and multiple flow holes 31 will also make the flow direction of the fluid in the balloon 20 more uniform, and the pressure will be evenly distributed to the inner wall surface of the balloon 20, reducing the impact of the water flow on the balloon 20, thereby preventing the balloon 20 from being damaged by excessive water pressure. And because the flow area formed by the flow hole 31 gradually increases in the radial outward direction, the water pressure can be distributed to various parts of the first flange 30 in the radial direction, thereby improving the first flange 30's ability to withstand water pressure.

[0033] Furthermore, the flow hole 31 includes a first hole 311 and a second hole 312, the first hole 311 is coaxially arranged with the tank body 10, and the second hole 312 is multiple, and the multiple second holes 312 are evenly arranged at intervals around the circumference of the first hole 311. In this way, the multiple second holes 312 are evenly arranged so that the water flows evenly from each second hole 312 into the balloon 20, and the water flows are evenly stopped.

[0034] The flow hole 31 also includes a third hole 313, and there are multiple third holes 313. The multiple third holes 313 are all opened on the radially outer side of the second hole 312 away from the first hole 311, and are staggered with the second hole 312. The third hole 313 further distributes the flow direction of the water flow to further divert the water flow, thereby reducing the pressure on various parts of the inner wall of the balloon 20. The second hole 312 and the third hole 313 are staggered to increase turbulence and further reduce water pressure.

[0035] The first hole 311, the second hole 312 and the third hole 313 can be arranged in a variety of ways, which are described in detail one by one here:

[0036] In one embodiment, the first holes 311 and the second holes 312 are both circular, and the second holes 312 are evenly spaced along the circumference of the first hole 311 .

[0037] In one embodiment, the first hole 311, the second hole 312, and the third hole 313 are all circular. The second holes 312 are evenly spaced along the circumferential direction of the first hole 311. The third holes 313 are provided on the radially outer side of the second holes 312 away from the first hole 311 and are arranged staggeredly with the second holes 312. This is to further optimize the reduction of water pressure and reduce the stress borne on the first flange 30.

[0038] Further, in one embodiment, the diameters of the first hole 311, the second hole 312, and the third hole 313 are the same. Or, the diameters of two of the first hole 311, the second hole 312, and the third hole 313 are the same, and the diameter of the other one is smaller than the two with the same diameter. Or, the diameter of one of the first hole 311, the second hole 312, and the third hole 313 is larger than the diameters of the other two. The flow holes 31 with the same diameter are convenient for processing and can provide the same water flow effect.

[0039] Exemplarily, the diameter of the second hole 312 is larger than the diameter of the first hole 311, and the diameters of all the second holes 312 are the same. Or, the diameter of the third hole 313 is larger than the diameters of the first hole 311 and the second hole 312. Or, the diameter of the first hole 311 is larger than the diameters of the second hole 312 and the third hole 313.

[0040] In one embodiment, the number of the second holes 312 is 4, 6, 8, or 12, etc.; and / or, the number of the third holes 313 is 4, 6, 8, or 12, etc. The even-numbered second holes 312 and third holes 313 can be symmetrically arranged. Therefore, when the water flows into the balloon 20 through the flow holes 31, it will be more uniform.

[0041] Even further, the first hole 311, the second hole 312, and the third hole 313 are arranged in a straight line along the radial direction of the flow blocking portion 301 for convenient processing.

[0042] Preferably, both the third hole 313 and the second hole 312 are arranged as fan-shaped rings. The fan-shaped ring has a higher space utilization rate and can increase the liquid flow rate to improve the use efficiency of the expansion tube.

[0043] The inner and outer sides of the second hole 312 along the radial direction and the inner and outer sides of the third hole 313 along the radial direction are both arc-shaped, and the radian is correspondingly the same as the outer edge of the first hole 311. In this way, the second hole 312 and the third hole 313 have a better fit with the first hole 311, and the area utilization rate on the flow blocking portion 301 is higher after the three are arranged.

[0044] It should be noted that the inner and outer sides of the second hole 312 in the radial direction here refer to that when the second hole 312 is fan-shaped, it has four hole walls. The hole wall on the side close to the first hole 311 is the inner side, and this side hole wall is arc-shaped. The hole wall on the side far from the first hole 311 is the outer side, and this side hole wall is also arc-shaped. Moreover, the hole walls on both the inner and outer sides are arc-shaped hole wall structures adapted to the circular outer peripheral arc of the circular first hole 311. Similarly, the third hole 313 is arranged in the same way as the inner and outer hole walls of the second hole 312, and will not be elaborated here.

[0045] Specifically, in an embodiment, when the first flange 30 is provided with the first hole 311 and the second hole 312, the diameter of the first hole 311 is set to 4 mm, and the diameter of the second hole 312 is set to 5 mm, so as to ensure the flow area of the flow hole 31 while preventing the flow hole 31 from being too large and affecting the structure of the first flange 30.

[0046] In an embodiment, the first flange 30 is provided with the second hole 312 and the third hole 313. The diameter of the first hole 311 is set to 4 mm, the diameter of the second hole 312 is set to 3 mm, and the diameter of the third hole 313 is set to 6 mm. And the distance between the center of the first hole 311 and the center of the second hole 312 is 4.5 mm, and the distance between the center of the first hole 311 and the center of the third hole 313 is 9.5 mm. In this way, the diameters of the respective flow holes 31 are reasonably set, and the distances between the respective flow holes 31 are appropriate, so as to ensure the flow area while ensuring the structural strength of the first flange 30.

[0047] In an embodiment, the first flange 30 is provided with the second hole 312 and the third hole 313. Both the second hole 312 and the third hole 313 are set as fan-shaped rings. And the diameter of the first hole 311 is set to 5 mm. The shortest distance between the center of the first hole 311 and the second hole 312 is set to 3 mm. The longest distance between the center of the first hole 311 and the second hole 312 is set to 5.5 mm. The longest distance between the center of the first hole 311 and the third hole 313 is set to 8 mm. In this way, the diameters of the respective flow holes 31 are reasonably set, and the distances between the respective flow holes 31 are appropriate, so as to ensure the flow area while ensuring the structural strength of the first flange 30.

[0048] A circular boss 32 protrudes from the side of the first flange 30 facing the tank body 10. The end of the balloon 20 is sleeved on the outer peripheral side of the circular boss 32. In this way, the circular boss 32 improves the connection strength between the balloon 20 and the first flange 30, with better fixing effect and stronger sealing performance.

[0049] The end of the balloon 20 extending outside the tank body 10 is folded along the radially outward direction to form a flanging 21, and the first flange 30 abuts against the flanging 21. In this way, the contact area between the balloon 20 and the first flange 30 is larger, and the connection strength is higher.

[0050] The expansion tank 100 includes a second flange 40 and a connecting member 50. The second flange 40 abuts against the side of the flanging 21 away from the first flange 30. There are multiple connecting members 50, and all of them pass through and are connected to the first flange 30 and the second flange 40. The second flange 40 and the first flange 30 are pressed against both sides of the flanging 21. The second flange 40 makes the position of the first flange 30 more fixed, and the two are pressed against the flanging 21 from two directions. Therefore, the connection strength between the flanging 21 and the first flange 30 and the second flange 40 is higher.

[0051] Compared with the prior art, the present utility model improves the flow rate of water flow, reduces the water pressure of the water flow, changes the flow direction of the water flow to increase the energy loss of the water flow, and makes the flow direction of the water flow entering the balloon 20 more uniform by opening a plurality of flow holes 31 with reduced apertures on the first flange 30. The pressure is evenly distributed to the inner wall surface of the balloon 20, reducing the impact of the water flow on the balloon 20, thereby preventing the balloon 20 from being damaged due to excessive water pressure. Multiple layout positions and opening shapes of the flow holes 31 are set to optimize the distribution of the water pressure by the flow holes 31.

[0052] 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.

[0053] The above-described embodiments merely represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it cannot be construed 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 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 utility model patent shall be subject to the appended claims.

Claims

1. An expansion tank, characterized in that: include: A tank body (10) having a chamber (11) therein, and an axial end of the tank body (10) is provided with a through hole (12) communicating with the chamber (11); A balloon (20), part of which is disposed in the chamber (11), and part of which extends from the through hole (12) to the outside of the tank body (10); The first flange (30) is connected to the end of the balloon (20) extending outside the tank body (10), and the first flange (30) has a flow blocking portion (301). A plurality of flow holes (31) are provided on the flow blocking portion (301), and the plurality of flow holes (31) are all connected to the interior of the balloon (20). The area of ​​the plurality of flow holes (31) is smaller than 1 / 2 of the area of ​​the opening of the balloon (20), and the flow area formed by the flow holes (31) gradually increases in the radial outward direction.

2. The expansion tank according to claim 1, characterized in that: The circulation hole (31) comprises a first hole (311) and a second hole (312); the first hole (311) is coaxially arranged with the tank body (10); there are a plurality of second holes (312), and the plurality of second holes (312) are evenly spaced and arranged circumferentially around the first hole (311).

3. The expansion tank according to claim 2, characterized in that: The circulation hole (31) further comprises a third hole (313), the third holes (313) are multiple, and the multiple third holes (313) are all opened on the radial outer side of the second hole (312) away from the first hole (311), and are staggered with the second hole (312).

4. The expansion tank according to claim 3, characterized in that: The first hole (311), the second hole (312) and the third hole (313) are all arranged in a circular shape.

5. The expansion tank according to claim 4, characterized in that: The diameters of the first hole (311), the second hole (312) and the third hole (313) are the same; or, Two of the first hole (311), the second hole (312) and the third hole (313) have the same diameter, and the diameter of the other one is smaller than the two with the same diameter; or, The diameter of one of the first hole (311), the second hole (312) and the third hole (313) is larger than the diameters of the other two.

6. The expansion tank according to claim 2, characterized in that: The circulation hole (31) further comprises a third hole (313), the third holes (313) being multiple, and the multiple third holes (313) are all opened on the radial outer side of the second hole (312) away from the first hole (311), and the first hole (311), the second hole (312) and the third hole (313) are arranged in a straight line along the radial direction of the flow blocking portion (301).

7. The expansion tank according to claim 6, characterized in that The second hole (312) and the third hole (313) are both arranged in a fan-shaped ring shape; The inner side and the outer side of the second hole (312) in the radial direction and the inner side and the outer side of the third hole (313) in the radial direction are both arc-shaped, and the curvature is the same as that of the outer edge of the first hole (311).

8. The expansion tank according to claim 1, characterized in that: The first flange (30) is provided with an annular boss (32) protruding from the side surface of the tank body (10), and the end of the balloon (20) is sleeved on the outer peripheral side of the annular boss (32).

9. The expansion tank according to claim 1, characterized in that: The end of the balloon (20) extending out of the tank body (10) is folded radially outward to form a flange (21), and the first flange (30) abuts against the flange (21).

10. The expansion tank according to claim 9, characterized in that The expansion tank comprises a second flange (40) and a connecting piece (50), wherein the second flange (40) abuts against a side of the flange (21) away from the first flange (30), and the connecting piece (50) is multiple and all are penetrated and connected to the first flange (30) and the second flange (40).

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