One-way valve and valve group device

Abstract

The utility model provides a one-way valve and a valve group device, the one-way valve comprises a guide pipe, a sealing ring, a valve core and a stopper, and two ends of the guide pipe are respectively welded with a communicating pipe made of cast iron or steel; the sealing ring is arranged in the guide pipe and is provided with a valve port; the valve element is movably arranged in the guide pipe so as to open and close the valve port; the stop piece is arranged in the guide pipe and arranged on the side, away from the sealing ring, of the valve element. The stop piece is used for stopping the valve element. The guide pipe, the sealing ring, the valve element and the stop piece are all made of cast iron or steel, or one or more of the guide pipe, the sealing ring, the valve element and the stop piece are made of cast iron, and the others are made of steel. According to the scheme, the valve element is movably arranged in the guide pipe, and the stop piece stops the valve element so as to prevent the valve element from being disengaged from the guide pipe. The guide pipe and the communicating pipe are made of cast iron or steel, so that the communicating pipe and the guide pipe can be directly welded and connected more conveniently and quickly. By means of the scheme, the problem that in the prior art, the connecting mode of a guide pipe and a communicating pipe of a one-way valve is complex is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of one-way valves, in particular to a one-way valve and a valve group device. Background Art

[0002] Some one-way valves in the prior art use pressure changes on both sides of the valve core to block or open the valve port of the one-way valve, thereby achieving the purpose of automatic one-way circulation of the fluid in the one-way valve. Both ends of the conduit of the one-way valve need to be fixedly connected to the connecting pipe. In the prior art, the connecting pipe connected to the one-way valve is made of copper, and the conduit of the one-way valve is made of steel. The connection method between the conduit and the connecting pipe is to fix copper sleeves at both ends of the conduit, and then fix them to the connecting pipe through the copper sleeve. The connection method between the two ends of the conduit and the connecting pipe is complicated and costly. At present, some connecting pipes are made of cast iron or steel. Therefore, there is a need for a conduit that can be connected to a connecting pipe made of cast iron or steel. Utility Model Content

[0003] The utility model provides a one-way valve and a valve group device to solve the problem that the conduit of the one-way valve in the prior art cannot be applied to a connecting pipe made of cast iron or steel.

[0004] In order to solve the above problems, according to one aspect of the utility model, the utility model provides a one-way valve, including a conduit, a sealing ring, a valve core and a stopper, the sealing ring is arranged in the conduit, and the sealing ring has a valve port; the valve core is movably arranged in the conduit to open and close the valve port; the stopper is arranged in the conduit and on the side of the valve core away from the sealing ring, and the stopper is used to stop the valve core; wherein, the conduit, the sealing ring, the valve core and the stopper are all made of cast iron or steel, or one or more of the conduit, the sealing ring, the valve core and the stopper are made of cast iron, and the others are made of steel.

[0005] Furthermore, the outer ring of the end face of the sealing ring away from the valve core is annularly laser welded to the inner wall of the conduit; and / or the outer ring of the end face of the stopper away from the valve core is annularly laser welded to the inner wall of the conduit.

[0006] Furthermore, the catheter includes a first section, a second section and a third section connected in sequence, the inner diameter of the second section is smaller than the inner diameters of the first section and the third section, a first limiting surface is formed between the first section and the second section, and a second limiting surface is formed between the third section and the second section.

[0007] Furthermore, the stopper is located in the first section, and the stopper abuts against the first limiting surface.

[0008] Furthermore, the sealing ring is located in the second section, and an end surface of the sealing ring facing away from the valve core is flush with the second limit surface.

[0009] Furthermore, the outer ring of the sealing ring is connected to the inner wall of the conduit, and the inner ring of the sealing ring has a first annular flow surface at one end close to the valve core, and the flow area of ​​the first annular flow surface gradually decreases along the valve closing direction, and the inner side of the sealing ring has a second annular flow surface at one end away from the valve core, and the flow area of ​​the second annular flow surface gradually increases along the valve closing direction.

[0010] Furthermore, the cross-section of the sealing ring along the axial direction of the one-way valve is the sealing ring cross-section, the angle between the two side edges of the first annular flow surface in the sealing ring cross-section is the first cross-section angle, the angle between the two side edges of the second annular flow surface in the sealing ring cross-section is the second cross-section angle, and the range of the first cross-section angle is 50° to 100°; and / or the range of the second cross-section angle is 50° to 100°.

[0011] Furthermore, the valve core includes a valve core body and a guide portion, the guide portion is arranged in the circumference of the valve core body, the valve core body is used to block or open the valve port, and the guide portion is slidably matched with the inner wall of the conduit.

[0012] According to another aspect of the present invention, a valve group device is provided, including a first connecting pipe, a second connecting pipe and the above-mentioned one-way valve, the first connecting pipe is connected to one end of the conduit of the one-way valve close to the stopper, the second connecting pipe is connected to one end of the conduit close to the sealing ring, and the first connecting pipe and the second connecting pipe are made of cast iron or steel.

[0013] Furthermore, the first connecting pipe is connected to the conduit by furnace welding, and the second connecting pipe is connected to the conduit by furnace welding.

[0014] The technical solution of the present invention provides a one-way valve, comprising a conduit, a sealing ring, a valve core, and a stopper. The sealing ring is disposed within the conduit, the sealing ring having a valve opening. The valve core is movably disposed within the conduit to open and close the valve opening. The stopper is disposed within the conduit and on the side of the valve core facing away from the sealing ring, the stopper being used to stop the valve core. The conduit, sealing ring, valve core, and stopper are all made of cast iron or steel, or one or more of the conduit, sealing ring, valve core, and stopper are cast iron and the others are steel. Using this solution, the valve core is movably disposed within the conduit. When the pressure on the side of the valve core near the sealing ring is less than the pressure on the side of the valve core facing away from the sealing ring, the valve core blocks the valve opening. When the pressure on the side of the valve core near the sealing ring is greater than the pressure on the side of the valve core facing away from the sealing ring, the valve core separates from the sealing ring, and the valve opening is opened. The stopper stops the valve core to prevent the valve core from falling out of the conduit. The conduit and connecting pipe are both made of cast iron or steel, allowing for direct welding connection between the connecting pipe and the conduit, which is more convenient and quick. Since the one-way valve is made of cast iron or steel, when the first and second connecting pipes are also made of cast iron or steel, they can be directly fixedly connected by furnace welding, which helps improve connection efficiency and reduce connection costs. This solution solves the problem in the prior art that the one-way valve conduit is not suitable for connecting pipes made of cast iron or steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic structural diagram of a one-way valve provided in an embodiment of the present utility model is shown;

[0017] Figure 2 Shown Figure 1 A schematic diagram of the structure of the one-way valve in the closed state;

[0018] Figure 3 Shown Figure 2 A partial enlarged view of point A in the middle;

[0019] Figure 4 Shown Figure 2 A partial enlarged view of point B in the middle.

[0020] The above drawings include the following reference numerals:

[0021] 10. Catheter;

[0022] 11. First paragraph;

[0023] 12. Second paragraph;

[0024] 121, first limiting surface;

[0025] 122. Second limiting surface;

[0026] 13. The third paragraph;

[0027] 20. Sealing ring;

[0028] 21. Valve port;

[0029] 22. First annular flow surface; 221. First cross-sectional angle;

[0030] 23. Second annular flow surface; 231. Second cross-sectional angle;

[0031] 30. Valve core;

[0032] 31. Valve core body; 32. Guide part;

[0033] 40. Stopper;

[0034] 50. First connecting pipe;

[0035] 60. Second connecting pipe. DETAILED DESCRIPTION

[0036] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way serves as any limitation on the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0037] like Figures 1 to 4 As shown, an embodiment of the present invention provides a one-way valve, including a conduit 10, a sealing ring 20, a valve core 30 and a stopper 40, wherein both ends of the conduit 10 are respectively welded to a connecting pipe made of cast iron or steel; the sealing ring 20 is arranged in the conduit 10, and the sealing ring 20 has a valve port 21; the valve core 30 is movably arranged in the conduit 10 to open and close the valve port 21; the stopper 40 is arranged in the conduit 10 and is arranged on the side of the valve core 30 away from the sealing ring 20, and the stopper 40 is used to stop the valve core 30; wherein, the conduit 10, the sealing ring 20, the valve core 30 and the stopper 40 are all made of cast iron or steel, or one or more of the conduit 10, the sealing ring 20, the valve core 30 and the stopper 40 are made of cast iron and the others are made of steel.

[0038] With this solution, the valve core 30 is movably disposed within the conduit 10. When the pressure on the side of the valve core 30 near the sealing ring 20 is less than the pressure on the side of the valve core 30 away from the sealing ring 20, the valve core 30 blocks the valve opening 21. When the pressure on the side of the valve core 30 near the sealing ring 20 is greater than the pressure on the side of the valve core 30 away from the sealing ring 20, the valve core 30 separates from the sealing ring 20, and the valve opening 21 opens. A stopper 40 stops the valve core 30 to prevent it from escaping from the conduit 10. Both the conduit 10 and the connecting pipe are made of cast iron or steel, allowing for a direct welding connection between the connecting pipe and the conduit, which is more convenient and quick. This solution solves the problem of complex connection methods between the conduit 10 and the connecting pipe in the prior art of one-way valves. Because the one-way valve is made of cast iron or steel, when the first connecting pipe 50 and the second connecting pipe 60 are also made of cast iron or steel, they can be directly fixedly connected by furnace welding, which helps improve connection efficiency and reduce connection costs.

[0039] Preferably, the conduit 10 , the sealing ring 20 , the valve core 30 , the stopper 40 and the connecting pipe can be made of carbon steel or stainless steel.

[0040] The outer ring of the end face of the sealing ring 20 away from the valve core 30 is annularly laser welded to the inner wall of the conduit 10; and / or the outer ring of the end face of the stopper 40 away from the valve core 30 is annularly laser welded to the inner wall of the conduit 10.

[0041] The outer ring of the sealing ring 20 is tightly fitted with the inner wall of the catheter 10 for laser welding, so that the sealing ring 20 is fixed at one end of the catheter 10, and the outer ring of the stopper 40 is tightly fitted with the inner wall of the catheter 10 for laser welding to fix the stopper 40 at the other end of the catheter 10.

[0042] like Figure 1 As shown, the catheter 10 includes a first section 11, a second section 12 and a third section 13 connected in sequence. The inner diameter of the second section 12 is smaller than the inner diameters of the first section 11 and the third section 13. A first limiting surface 121 is formed between the first section 11 and the second section 12, and a second limiting surface 122 is formed between the third section 13 and the second section 12.

[0043] The first limiting surface 121 is located at the end surface of the second section 12 close to one end of the first section 11, and the second limiting surface 122 is located at the end surface of the second section 12 close to one end of the third section 13. The first limiting surface 121 directly or indirectly limits the first connecting tube 50, and the second limiting surface 122 directly or indirectly limits the second connecting tube 60.

[0044] like Figure 1 As shown, the stopper 40 is located in the first section 11 , and the stopper 40 abuts against the first limiting surface 121 .

[0045] It is understandable that the first limiting surface 121 limits the stopper 40 so that the position of the stopper 40 in the conduit 10 is fixed and does not move during use of the one-way valve.

[0046] like Figure 1 As shown, the sealing ring 20 is located in the second section 12 , and the end surface of the sealing ring 20 facing away from the valve core 30 is flush with the second limiting surface 122 .

[0047] The outer ring of the sealing ring 20 is tightly fitted to the inner wall of the conduit 10 for laser welding. With this arrangement, when welding the second connecting pipe 60 and the conduit 10, the solder cannot penetrate into the inner wall of the second section 12 through the gap between the sealing ring 20 and the conduit 10, thereby preventing the solder from affecting the smoothness of the inner wall of the second section 12 and affecting the flexible movement of the valve core 30 in the conduit 10.

[0048] It is conceivable that the outer ring of the stopper 40 forms an interference fit with the inner wall of the conduit 10, ensuring a tight fit between the stopper 40 and the conduit 10, thus enhancing the laser welding process. Laser welding the outer ring of the stopper 40 to the conduit 10 prevents solder from seeping into the second section 12 of the conduit 10 through the gap between the stopper and the conduit 10 during welding of the second connecting tube 60, thereby reducing the smoothness of the second section 12 and preventing the valve core from moving flexibly within the conduit 10.

[0049] like Figure 4As shown, the outer ring of the sealing ring 20 is connected to the inner wall of the conduit 10, and the inner ring of the sealing ring 20 has a first annular flow surface 22 at one end close to the valve core 30, and the flow area of ​​the first annular flow surface 22 gradually decreases in the valve closing direction. The inner side of the sealing ring 20 has a second annular flow surface 23 at one end away from the valve core 30, and the flow area of ​​the second annular flow surface 23 gradually increases in the valve closing direction.

[0050] The first annular flow surface 22 guides the medium entering the valve port 21, while the second annular flow surface 23 guides the medium into the valve port 21. This allows the medium to flow along the first and second annular flow surfaces 22, 23, gradually changing the flow area of ​​the medium. This prevents sudden changes in the flow area that could cause significant impact on the medium. The arrangement of the first and second annular flow surfaces 22, 23 stabilizes the flow of the medium, preventing significant impacts, and maintains the flow capacity of the valve port 21 without increasing the inner diameter of the valve port 21.

[0051] like Figure 4 As shown, the cross-section of the sealing ring 20 along the axial direction of the one-way valve is the sealing ring cross-section, the angle between the two side edges of the first annular flow surface 22 in the sealing ring cross-section is the first cross-sectional angle 221, and the angle between the two side edges of the second annular flow surface 23 in the sealing ring cross-section is the second cross-sectional angle 231, and the range of the first cross-sectional angle 221 is 50° to 100°; and / or the range of the second cross-sectional angle 231 is 50° to 100°.

[0052] With this arrangement, the first cross-sectional angle 221 is in the range of 50° to 100°, and the second cross-sectional angle 231 is in the range of 50° to 100°. Within this range, the flow capacity of the medium is better when flowing through the valve port 21. Furthermore, when the first cross-sectional angle 221 and the second cross-sectional angle 231 are in the range of 50° to 100°, the flow area of ​​the medium changes slowly, and the flow of the medium is relatively smooth, without causing significant impact.

[0053] like Figure 2 As shown, the valve core 30 includes a valve core body 31 and a guide portion 32 . The guide portion 32 is arranged circumferentially of the valve core body 31 . The valve core body is used to block or open the valve port 21 . The guide portion 32 is in sliding cooperation with the inner wall of the conduit 10 .

[0054] The valve core body 31 is used to block or open the valve port 21. The guide portion 32 is provided circumferentially around the valve core body 31 to guide the valve core 30, allowing the valve core 30 to move along the axis of the sealing ring. A passage for fluid circulation is also formed between the outer wall of the valve core 30 and the inner wall of the conduit 10. When the pressure on the side of the valve core 30 close to the valve port 21 is greater than the pressure on the side of the valve core 30 away from the valve port 21, the valve port 21 opens, and the guide portion 32 guides the valve core 30 to move along the axis of the sealing ring away from the valve port 21. When the pressure on the side of the valve core 30 close to the valve port 21 is less than the pressure on the side of the valve core 30 away from the valve port 21, the end of the valve core body 31 close to the valve port 21 blocks the valve port 21.

[0055] According to another aspect of the present invention, a valve group device is provided, including a first connecting pipe 50, a second connecting pipe 60 and the above-mentioned one-way valve, the first connecting pipe 50 is connected to the end of the conduit 10 of the one-way valve close to the stopper 40, and the second connecting pipe 60 is connected to the end of the conduit 10 close to the sealing ring 20, and the first connecting pipe 50 and the second connecting pipe 60 are made of cast iron or steel.

[0056] The conduit 10 can be connected to the first connecting pipe 50 and the second connecting pipe 60 by welding. Compared with the prior art method of connecting sleeves at both ends of the conduit 10 and then connecting the sleeves to the first connecting pipe 50 and the second connecting pipe 60, the welding method is simpler, more convenient and faster.

[0057] Furthermore, the first connecting pipe 50 is connected to the conduit 10 by furnace welding, and the second connecting pipe 60 is connected to the conduit 10 by furnace welding.

[0058] The one-way valve's conduit 10, sealing ring 20, valve core 30, and stopper 40 are made of cast iron or steel. The conduit 10, first connecting pipe 50, and second connecting pipe 60 can be integrally furnace-welded. This design is more convenient and cost-effective than the prior art method of installing sleeves at the ends of the conduit 10 to connect them to the first and second connecting pipes 50, 60, respectively, through the sleeves.

[0059] The advantages of this utility model are:

[0060] 1. The conduit 10, sealing ring 20, valve core 30, stopper 40 and connecting pipe are all made of cast iron or steel, so that the connecting pipe and conduit 10 can be connected by integral furnace welding, which is more convenient and quick;

[0061] 2. The conduit 10 is provided with a first limiting surface 121 and a second limiting surface 122 to limit the length of the first communicating tube 50 and the second communicating tube 60 inserted into the conduit 10 , thereby preventing the portions of the first communicating tube 50 and the second communicating tube 60 inserted into the conduit 10 from interfering with the movement of the valve core 30 ;

[0062] 3. The first annular flow surface 22 and the second annular flow surface 23 guide the medium, making the flow of the medium more stable and less susceptible to large impacts. The flow capacity of the valve port 21 is ensured without increasing the inner diameter of the valve port 21.

[0063] 4. The first cross-sectional angle 221 of the first annular flow surface 22 is set to a range of 50° to 100°, and the second cross-sectional angle 231 of the second annular flow surface 23 is set to a range of 50° to 100°. Within this range, the flow capacity of the medium when flowing through the valve port 21 is better, and the flow area of ​​the medium changes slowly, making the flow of the medium relatively smooth and less prone to large impacts. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0066] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0067] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "upper" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in a drawing is inverted, a device described as "above" or "on top of" another device or structure would then be positioned as "below" or "below" the other device or structure. Thus, the exemplary term "above" can include both the "above" and "below" orientations. The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0068] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

Claims

1. A one-way valve, characterized in that: include: catheter (10); A sealing ring (20), the sealing ring (20) is arranged in the conduit (10), and the sealing ring (20) has a valve port (21); a valve core (30), the valve core (30) being movably disposed in the conduit (10) to open and close the valve port (21); a stopper (40), the stopper (40) being arranged in the conduit (10) and on a side of the valve core (30) facing away from the sealing ring (20), the stopper (40) being used to stop the valve core (30); The conduit (10), the sealing ring (20), the valve core (30) and the stopper (40) are all made of cast iron or steel, or one or more of the conduit (10), the sealing ring (20), the valve core (30) and the stopper (40) are made of cast iron and the others are made of steel.

2. The one-way valve according to claim 1, characterized in that: The outer ring of the end face of the sealing ring (20) facing away from the valve core (30) is circularly laser welded to the inner wall of the conduit (10); and / or the outer ring of the end face of the end of the stopper (40) facing away from the valve core (30) is circularly laser welded to the inner wall of the conduit (10).

3. The one-way valve according to claim 1, characterized in that The conduit (10) comprises a first section (11), a second section (12) and a third section (13) connected in sequence, the inner diameter of the second section (12) is smaller than the inner diameters of the first section (11) and the third section (13), a first limiting surface (121) is formed between the first section (11) and the second section (12), and a second limiting surface (122) is formed between the third section (13) and the second section (12).

4. The one-way valve according to claim 3, characterized in that: The stopper (40) is located in the first section (11), and the stopper (40) abuts against the first limiting surface (121).

5. The one-way valve according to claim 3, characterized in that: The sealing ring (20) is located in the second section (12), and the end surface of the sealing ring (20) facing away from the valve core (30) is flush with the second limiting surface (122).

6. The one-way valve according to claim 1, characterized in that The outer ring of the sealing ring (20) is connected to the inner wall of the conduit (10), and the inner ring of the sealing ring (20) has a first annular flow surface (22) at one end close to the valve core (30), and the flow area of ​​the first annular flow surface (22) gradually decreases along the valve closing direction. The inner side of the sealing ring (20) has a second annular flow surface (23) at one end facing away from the valve core (30), and the flow area of ​​the second annular flow surface (23) gradually increases along the valve closing direction.

7. The one-way valve according to claim 6, characterized in that: The cross section of the sealing ring (20) along the axial direction of the one-way valve is a sealing ring cross section, the angle between the two side edges of the first annular flow surface (22) in the sealing ring cross section is a first cross section angle (221), the angle between the two side edges of the second annular flow surface (23) in the sealing ring cross section is a second cross section angle (231), the first cross section angle (221) is in the range of 50° to 100°; and / or the second cross section angle (231) is in the range of 50° to 100°.

8. The one-way valve according to claim 1, wherein: The valve core (30) includes a valve core body (31) and a guide portion (32). The guide portion (32) is arranged on the circumference of the valve core body (31). The valve core body (31) is used to block or open the valve port (21). The guide portion (32) is slidably matched with the inner wall of the conduit (10).

9. A valve group device, characterized in that: It comprises a first connecting pipe (50), a second connecting pipe (60) and a one-way valve according to any one of claims 1 to 8, wherein the first connecting pipe (50) is connected to an end of the conduit (10) of the one-way valve close to the stopper (40), and the second connecting pipe (60) is connected to an end of the conduit (10) close to the sealing ring (20), and the first connecting pipe (50) and the second connecting pipe (60) are made of cast iron or steel.

10. The valve assembly according to claim 9, characterized in that: The first connecting pipe (50) is connected to the conduit (10) by furnace welding, and the second connecting pipe (60) is connected to the conduit (10) by furnace welding.

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