Hard sealing rotary ball valve

Abstract

The utility model discloses a hard sealing rotary ball valve, and belongs to the technical field of rotary ball valves. A hard sealing rotary ball valve comprises a valve plate and a valve seat connected with the valve plate in an abutting mode, the valve plate comprises a valve plate base body and a first sealing ring, the valve plate base body is rotationally installed on the valve body through a rotating shaft, the first sealing ring is detachably arranged on the outer circumference of the valve plate base body, and the outer circumferential face of the first sealing ring is connected with the valve seat in an abutting mode; the utility model has the advantages that the manufacturing cost is saved, the maintenance is convenient, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary ball valves, in particular to a hard-sealed rotary ball valve. Background Art

[0002] A rotary ball valve is a new combination of a butterfly valve and a hemisphere valve with double-sided metal hard seals. It has the functions and advantages of both butterfly valves and hemisphere valves, and also has multiple advantages such as small size, light weight, convenient transportation, installation and maintenance, reliable operation, and zero leakage of double-sided seals.

[0003] However, although there is a compensation function between the valve plate and the valve seat of the rotary ball valve, the valve plate and the valve seat are mostly integrally formed structures. When replacement is needed after long-term impact and corrosion by the medium, the valve plate and the valve seat often need to be replaced as a whole. Firstly, it causes material waste and increases the maintenance cost. Secondly, small rotary ball valves can be directly repaired, while for large rotary ball valves, due to their large weight, lifting equipment is often required, further increasing the maintenance cost. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem of high cost caused by the overall replacement of the valve plate and the valve seat during the repair process of the existing rotary ball valve, and to propose a hard-sealed rotary ball valve.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A hard-sealed rotary ball valve includes a valve plate and a valve seat in contact with the valve plate. The valve plate includes a valve plate base body and a first sealing ring. The valve plate base body is rotatably installed on the valve body through a rotating shaft. The first sealing ring is detachably arranged on the outer circumference of the valve plate base body, and the outer circumferential surface of the first sealing ring is in contact with the valve seat.

[0007] Further, a ring-shaped first wear-resistant part is arranged at a position of the first sealing ring close to the valve seat, and the first wear-resistant part is in contact with the valve seat.

[0008] Further, the cross-section of the first wear-resistant part is triangular, and the end face of the first wear-resistant part close to the valve seat is a convex arc surface structure.

[0009] Further, a first gland ring is arranged at one end of the first sealing ring away from the rotating shaft, and the first sealing ring is tightly installed on the valve plate base body through the first gland ring.

[0010] Further, the valve seat includes a valve seat base body and a second sealing ring. The valve seat base body is floatingly installed between the valve body and the pressure plate. The second sealing ring is detachably arranged on the end face of the valve seat base body close to the rotating shaft, and the second sealing ring is in contact with the first sealing ring.

[0011] Further, a ring-shaped second wear-resistant part is arranged at a position of the second sealing ring close to the first sealing ring, and the second wear-resistant part abuts against the first sealing ring.

[0012] Further, the cross-section of the second wear-resistant part is pentagonal, and the end face of the second wear-resistant part close to the first sealing ring is tangent to the end face of the first sealing ring.

[0013] Further, the included angle between the two end faces of the second wear-resistant part in contact with the second sealing ring is a right angle.

[0014] Further, a second gland ring is arranged on the end face of the second sealing ring close to the rotating shaft, and the second sealing ring is tightly installed on the valve seat base through the second gland ring.

[0015] Compared with the prior art, the present utility model provides a hard-sealing rotary ball valve, which has the following beneficial effects:

[0016] In the hard-sealing rotary ball valve of the present utility model, during use, when the valve plate rotates to cut off the flow channel, the first sealing ring abuts against the valve seat to achieve a hard-sealing effect. When the first sealing ring is severely worn and needs to be replaced after long-term use, only the first sealing ring needs to be separately removed and replaced. First, there is no need to replace the entire valve plate, reducing the material cost. Second, the first sealing ring has a relatively smaller overall mass compared to the valve plate, and no hoisting equipment is required for replacement. Third, during the reproduction process, the first sealing ring and the valve plate base can be separately processed. The valve plate base is generally made of cast iron, while the first sealing ring can be made of alloy steel, improving the service life of the first sealing ring.

[0017] Other advantages, objectives and features of the present utility model will be described to some extent in the subsequent specification; and to some extent, based on the study of the following text, it will be obvious to those skilled in the art; or, it can be taught from the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic cross-sectional view of the overall structure of the present utility model;

[0019] Figure 2 is of the present utility model Figure 1 schematic enlarged view of the structure of part A therein;

[0020] Figure 3 is a schematic view of the right side perspective of the valve seat structure of the present utility model.

[0021] In the figure:

[0022] 1. Valve body; 2. Valve plate; 201. Valve plate base; 202. First sealing ring; 203. First gland ring; 204. First wear-resistant part; 205. Bolt; 3. Pressure plate; 4. Valve seat; 401. Valve seat base; 402. Second sealing ring; 403. Second gland ring; 404. Second wear-resistant part; 5. Rotating shaft; 6. Flow channel. Detailed implementation mode

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0024] Refer to Figures 1-3 , a hard-sealed rotary ball valve of the present invention includes a valve plate 2 and a valve seat 4 in contact with the valve plate 2, and also includes a valve body 1, a pressure plate 3, a rotating shaft 5 and a flow channel 6. The rotating shaft 5 includes an upper shaft and a lower shaft. The valve plate 2 includes a valve plate base 201 and a first sealing ring 202. The valve plate base 201 is rotatably installed inside the valve body 1 through the upper week and the lower shaft. The first sealing ring 202 is detachably installed on the outer circumference of the valve plate base 201, and the outer circumferential surface of the first sealing ring 202 is in contact with the valve seat 4.

[0025] A through hole is opened in the middle of the first sealing ring 202, and the through holes are distributed in a circumferential array. The bolt 205 passes through the through holes to fix the first sealing ring 202 on the valve plate base 201. During use, the valve plate base 201 is rotated, and the valve plate base 201 drives the first sealing ring 202 to rotate and contact with the valve seat 4 to cut off the flow channel 6 to achieve a blocking effect.

[0026] A ring-shaped first wear-resistant part 204 is installed at a position of the first sealing ring 202 close to the valve seat 4, and the first wear-resistant part 204 is in contact with the valve seat 4. Since the contact area between the valve plate 2 and the valve seat 4 is very small itself, if alloy steel is directly selected to make the first sealing ring, there are still problems of material waste and high cost. Therefore, the first wear-resistant part 204 is made of alloy steel or cast iron quenched and tempered, and then the first wear-resistant part 204 is welded to the first sealing ring 202. In this way, on the premise of meeting the use requirements, the overall manufacturing cost of the first sealing ring 202 and the first wear-resistant part 204 is reduced.

[0027] The cross-section of the first wear-resistant part 204 is triangular and is a quasi-right-angled triangle. The end face of the first wear-resistant part 204 close to the valve seat 4 is a convex arc surface structure, that is, the hypotenuse of the quasi-right-angled triangle is an arc. The first wear-resistant part 204 contacts the first sealing ring 202 through the end faces where the two right-angled sides are located, and is mainly used to offset the pressure from the valve seat 4 to the center direction of the valve plate 2 and the direction of the medium flow.

[0028] One end of the first sealing ring 202 away from the rotating shaft 5 is provided with a first gland ring 203. The first sealing ring is tightly installed on the valve plate base 201 through the first gland ring 203. As Figures 1-2 shown, the rotating shaft 5 is on the right side of the first sealing ring 202, and the first gland ring 203 is at the left end of the first sealing ring 202. Compared with directly fixing to the valve plate base 201 by bolts, using the first gland ring 203 to tightly fix to the valve plate base 201 mainly increases the contact area between the first sealing ring 202 and the fasteners (bolts 205 and the first gland ring 203), thereby improving the fastening stability.

[0029] The valve seat 4 includes a valve seat base 401 and a second sealing ring 402. The valve seat base 401 is floatingly and sealingly installed between the valve body 1 and the pressure plate 3. A second sealing ring 402 is detachably arranged on the end face of the valve seat base 401 close to the rotating shaft 5. The second sealing ring 402 abuts against the first sealing ring 202. The second sealing ring 402 floats left and right through the valve seat base 401. A hard seal is formed between the second sealing ring 402 and the first sealing ring 202. When the second sealing ring 402 is worn and needs to be replaced, it can also be removed and replaced separately without replacing the valve seat base 401.

[0030] Since the functions of the valve seat base 401 and the second sealing ring 402 are different, the wear generated during the working process is also different. Separately setting and combining the valve seat base 401 and the second sealing ring 402 to form the valve seat 4 can, while ensuring the sealing effect of the valve seat 4 remains unchanged, mainly replace the second sealing ring 402 during maintenance and replacement, reducing the cost during maintenance and replacement.

[0031] A ring-shaped second wear-resistant part 404 is installed at the position of the second sealing ring 402 close to the first sealing ring 202. The second wear-resistant part 404 abuts against the first sealing ring 202. The function of the second wear-resistant part 404 is similar to that of the first sealing ring 202 in terms of function and production material. The main function is to control the material cost on the premise of ensuring the sealing effect.

[0032] The cross-section of the second wear-resistant part 404 is pentagonal. The end face of the second wear-resistant part 404 close to the first sealing ring 202 is tangent to the end face of the first sealing ring 202. End face tangency means that as Figure 2 shown, the inclined surface of the first sealing ring 202 in it is an arc surface, and the surface of the second wear-resistant part 404 in contact with the first sealing ring 202 is on the tangent line of this arc surface. Thus, when there is slight wear and the valve seat 4 and the valve plate 2 undergo micro-deformation under the medium pressure, it can automatically compensate for the slight wear and maintain the sealing effect.

[0033] The included angle between the two end faces of the second wear-resistant part 404 in contact with the second sealing ring 402 is a right angle, so that the pressures on the second wear-resistant part 404 and the second sealing ring 402 from the two directions of the medium flow direction of the valve plate 2 and radially outward along the valve plate 2 can be offset by the end faces where the two right-angle sides are located respectively.

[0034] A second gland ring 403 is installed on the end face of the second sealing ring 402 close to the rotating shaft 5. The second sealing ring 402 is tightly installed on the valve seat base 401 through the second gland ring 403. The function of the second gland ring 403 is similar to that of the first gland ring 203, mainly to fix the second sealing ring 402 more firmly.

[0035] In this application, the cross-section of the first sealing ring 202 is in the shape of a '7', as Figure 2 shown. The width of the top of the first sealing ring 202 is greater than the width of the bottom. The main function is that the first sealing ring 202 and the first wear-resistant part 204 have sufficient contact area, and the first wear-resistant part 204 can be stably welded to the first sealing ring 202.

[0036] Working principle: When in use, install this valve in the pipeline to form a flow channel 6 for the medium to flow in the axial direction of the valve plate 2. When the rotating shaft 5 is rotated to drive the valve plate base 201 to rotate, the valve plate base 201 drives the first sealing ring 202, the first gland ring 203, and the first wear-resistant part 204 to rotate synchronously. When the first wear-resistant part 204 abuts against the second wear-resistant part 404, a hard sealing effect is achieved, and bidirectional sealing can be realized.

[0037] When the sealing effect deteriorates, check the first wear-resistant part 204 and the second wear-resistant part 404. When replacement is needed, first remove the first gland ring 203 or the second gland ring 403, take off the first sealing ring 202 or the second sealing ring 402. After replacing with new ones, fix the first gland ring 203 or the second gland ring 403 and the new first sealing part 202 and the second sealing ring 402 with bolts 205.

[0038] The above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent replacements or changes, and should be covered within the protection scope of the present utility model.

[0039] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0040] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A hard-sealed rotary ball valve, comprising a valve plate (2) and a valve seat (4) abutting against the valve plate (2), characterized in that: The valve plate (2) comprises a valve plate base (201) and a first sealing ring (202); the valve plate base (201) is rotatably mounted on the valve body (1) via a rotating shaft (5); a first sealing ring (202) is detachably provided on the outer circumference of the valve plate base (201); an outer circumferential surface of the first sealing ring (202) abuts against a valve seat (4).

2. A hard-sealed rotary ball valve according to claim 1, characterized in that: A first annular wear-resistant portion (204) is provided on the first sealing ring (202) at a position close to the valve seat (4), and the first wear-resistant portion (204) abuts against the valve seat (4).

3. A hard-sealed rotary ball valve according to claim 2, characterized in that: The cross section of the first wear-resistant portion (204) is triangular, and the end surface of the first wear-resistant portion (204) close to the valve seat (4) is a convex arc surface structure.

4. A hard-sealed rotary ball valve according to claim 1, characterized in that: A first gland ring (203) is provided at one end of the first sealing ring (202) away from the rotating shaft (5), and the first sealing ring (202) is pressed and mounted on the valve plate base (201) by the first gland ring (203).

5. A hard-sealed rotary ball valve according to claim 1, characterized in that: The valve seat (4) comprises a valve seat base (401) and a second sealing ring (402); the valve seat base (401) is floatingly mounted between the valve body (1) and the pressure plate (3); a second sealing ring (402) is detachably provided on the end surface of the valve seat base (401) close to the rotating shaft (5); the second sealing ring (402) is in abutment with the first sealing ring (202).

6. A hard-sealed rotary ball valve according to claim 5, characterized in that: The second sealing ring (402) is provided with an annular second wear-resistant portion (404) at a position close to the first sealing ring (202), and the second wear-resistant portion (404) abuts against the first sealing ring (202).

7. A hard-sealed rotary ball valve according to claim 6, characterized in that: The cross section of the second wear-resistant portion (404) is pentagonal, and the end surface of the second wear-resistant portion (404) close to the first sealing ring (202) is tangent to the end surface of the first sealing ring (202).

8. A hard-sealed rotary ball valve according to claim 7, characterized in that: The angle between the two end surfaces of the second wear-resistant portion (404) in contact with the second sealing ring (402) is a right angle.

9. A hard-sealed rotary ball valve according to claim 5, characterized in that: A second gland ring (403) is provided on the end surface of the second sealing ring (402) close to the rotating shaft (5), and the second sealing ring (402) is pressed and mounted on the valve seat base (401) by the second gland ring (403).

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