High-temperature pre-tightening anti-jamming metal hard sealing V-shaped ball valve

Abstract

The utility model discloses a high-temperature pre-tightening anti-jamming metal hard sealing V-shaped ball valve, which relates to the technical field of valves, and comprises a valve body, a valve core, a valve seat, an upper valve rod and a lower valve rod, the valve core is a ball body and is provided with a V-shaped notch, one side of the valve seat back to the valve core is provided with a pressing ring, and the outer side of the pressing ring is fixedly provided with a sealing seat cover. The sealing seat cover comprises a mounting part, a first sealing part and a second sealing part which are connected; a spring cavity is formed between the mounting part and the pressing ring, and a spring is arranged in the spring cavity; the first sealing part is located at the end, close to the flow channel, of the spring cavity and seals the end, and a first sealing ring is arranged between the first sealing part and the pressing ring. The second sealing part is located at the end, close to the valve body, of the spring cavity and seals the end, the second sealing part extends into the pressing ring, and a second sealing ring is arranged between the second sealing part and the pressing ring. According to the utility model, a medium can be completely prevented from entering the spring cavity, and the effect of preventing the medium entering the spring cavity from causing spring jamming and valve failure caused by pre-tightening failure is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and more specifically to a high-temperature pre-tightening and anti-jamming metal hard-sealed V-shaped ball valve. Background Art

[0002] Metal hard seal V-type ball valve is widely used in papermaking, petroleum, metallurgy, polysilicon, chemical fiber, pharmaceutical and other industries. The V-shaped cut has great shearing and self-cleaning functions, especially suitable for media containing fibers or fine particles, and also has the functions of regulation and shearing.

[0003] However, the metal hard-sealed V-type ball valve still has the problem of easy accumulation of materials in the valve cavity. In this regard, a Chinese utility model patent with patent authorization announcement number CN214579011 U discloses a sanitary V-type ball valve, which adopts a V-type valve core and a single valve seat assembly. The valve seat and the V-type valve core are hard-sealed together, and an accommodating space for the first sealing ring is reserved between the pressure ring and the valve seat. The port of the valve body is provided with a mounting step hole, the mounting ring part of the sealing seat cover is arranged in the mounting step hole, the guide sleeve part is sleeved in the inner hole of the valve seat, the second sealing ring is arranged between the guide sleeve part and the valve seat, and the spring is arranged on the front side of the pressure ring.

[0004] In this technical solution, although the first sealing ring and the second sealing ring can seal the gap between the valve body and the single valve seat assembly to prevent the medium from entering the single valve seat assembly through the gap and causing material accumulation, this technical solution only seals the gap on the side of the spring cavity in the single valve seat assembly facing the flow channel, i.e., the front side of the spring cavity. However, in fact, the side of the spring cavity in the ball valve facing away from the flow channel, i.e., the back side of the spring cavity, is open, and the medium can also enter the single valve seat assembly through the back side of the spring cavity.

[0005] That is to say, this technical solution cannot completely prevent the medium from entering the valve cavity. The medium entering the spring cavity is likely to cause the spring to become stuck and the pre-tightening to fail, thereby causing the valve seal to fail, which needs to be improved. Utility Model Content

[0006] In view of this problem in practical application, the utility model aims to propose a high-temperature pre-tightening anti-jamming metal hard seal V-type ball valve, the specific scheme is as follows:

[0007] A high-temperature pre-tightening anti-jamming metal hard-sealed V-shaped ball valve, comprising a valve body with a flow channel, a valve core located in the valve body, a valve seat forming a hard seal with the valve core, an upper valve stem and a lower valve stem connected to the valve core, the valve core is a sphere and has a V-shaped cutout, a pressure ring is provided on the side of the valve seat facing away from the valve core, and a sealing seat cover is fixed on the outside of the pressure ring, wherein:

[0008] The sealing seat cover comprises a connected mounting portion, a first sealing portion and a second sealing portion;

[0009] A spring cavity is formed between the mounting portion and the pressing ring, and a spring is arranged in the spring cavity;

[0010] The first sealing portion is located at one end of the spring chamber close to the flow channel and seals the end, and a first sealing ring is provided between the first sealing portion and the pressure ring;

[0011] The second sealing portion is located at one end of the spring chamber close to the valve body and seals the end, and the second sealing portion extends into the pressing ring and a second sealing ring is provided between the second sealing portion and the pressing ring.

[0012] Furthermore, the upper valve stem and the lower valve stem are connected to the valve core by spline fitting.

[0013] Furthermore, the spring is a disc spring, and the disc spring is made of Inconel alloy.

[0014] Furthermore, the valve body is cast in one piece.

[0015] Furthermore, the sealing surface between the valve seat and the valve core has a knife edge, and the knife edge is configured as a scraping structure.

[0016] Furthermore, the valve body is fixed by a jacket.

[0017] Furthermore, the sealing seat cover is fixed to the valve body by locking bolts.

[0018] Furthermore, the first sealing ring and the second sealing ring are both made of flexible graphite.

[0019] Furthermore, a stuffing box is provided in the valve body, a stuffing gland is provided on the stuffing box, and the upper valve stem passes through the stuffing box and the stuffing gland and is connected to the valve body via a coupling.

[0020] Furthermore, it also includes an upper locating bearing and a lower locating bearing, wherein:

[0021] The upper positioning bearing is installed at the matching position between the upper valve stem and the valve body, and is used to limit the movement of the upper valve stem in the radial and axial directions;

[0022] The lower positioning bearing is installed at the matching position of the lower valve stem and the valve body, and is used to limit the movement of the lower valve stem in the radial and axial directions.

[0023] Furthermore, the upper locating bearing and the lower locating bearing are integrally sintered.

[0024] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0025] In the utility model, a first sealing ring and a second sealing ring are provided to seal the front side and the back side of the spring cavity respectively, so that the medium can be completely blocked from entering the spring cavity from the front and back sides of the spring cavity, thereby solving the problem of medium entering the spring cavity and accumulating, causing the spring to become stuck, the pre-tightening to fail, and thus causing the valve sealing to fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall schematic diagram of an embodiment of the utility model;

[0027] Figure 2 For this utility model Figure 1 A partial enlarged view of the middle part;

[0028] Figure 3 For this utility model Figure 1 A partial enlarged view of point B in the middle;

[0029] Figure 4 For this utility model Figure 1 A partial enlarged view of point C in the middle.

[0030] : Illustrations: 1. valve body; 2. valve core; 3. valve seat; 4. upper valve stem; 5. lower valve stem; 6. pressure ring; 7. sealing seat cover; 71. mounting portion; 72. first sealing portion; 73. second sealing portion; 8. spring chamber; 9. spring; 10. first sealing ring; 11. second sealing ring; 12. jacket; 13. locking bolt; 14. stuffing box; 15. stuffing gland; 16. coupling; 17. upper locating bearing; 18. lower locating bearing; 19. bottom cover. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0032] like Figure 1 As shown, a high-temperature pre-tightened anti-jamming metal hard-sealed V-type ball valve includes a valve body 1 with a flow channel, a valve core 2 is arranged in the valve body 1, a valve seat 3 forming a hard seal with the valve core 2, an upper valve stem 4 connected to the valve core 2, and a lower valve stem 5.

[0033] The valve body 1 includes an upper valve body and a lower valve body (not shown in the figure), the flow channel is located between the upper valve body and the lower valve body, and the upper valve body and the lower valve body are fixed by a jacket 12. A stuffing box 14 is arranged in the valve body 1, and a stuffing gland 15 is arranged on the stuffing box 14. The upper valve stem 4 passes through the stuffing box 14 and the stuffing gland 15 and is connected to the valve body 1 through a coupling 16.

[0034] The valve core 2 is a sphere with a V-shaped cutout, and the sphere can cut off the medium containing fibers, viscous particles, etc. during the switching process to prevent the valve from getting stuck.

[0035] A pressure ring 6 is provided on the side of the valve seat 3 facing away from the valve core 2, and a sealing seat cover 7 is provided on the outer side of the pressure ring 6. Preferably, the sealing seat cover 7 is fixed to the valve body 1 by means of a locking bolt 13 and a locking nut. After locking, the sealing seat cover 7 fixes the pressure ring 6 on the valve seat 3.

[0036] A spring chamber 8 is provided between the pressure ring 6 and the sealing seat cover 7, and a spring 9 is provided in the spring chamber 8; preferably, the spring 9 is a disc spring 9. The valve seat 3 is a floating valve seat, and the floating valve seat 3 provides a pre-tightening force through the disc spring 9 to ensure the sealing performance of the valve. The disc spring 9 is made of Inconel alloy, which has good high temperature resistance and corrosion resistance.

[0037] Combination Figure 2 The sealing seat cover 7 includes a mounting portion 71 , a first sealing portion 72 and a second sealing portion 73 which are connected to each other.

[0038] The mounting portion 71 is an annular structure. More specifically, the spring chamber 8 is located between the mounting portion 71 and the pressure ring 6. The first sealing portion 72 and the second sealing portion 73 are both located in the annular inner ring of the mounting portion 71.

[0039] More specifically, the first sealing portion 72 extends from the side of the mounting portion 71 close to the flow channel toward the pressing ring 6 until it reaches the valve seat 3, and is closely attached to the end surface of the pressing ring 6 and the valve seat 3 facing the flow channel. At this time, the first sealing portion 72 is located at one end of the spring chamber 8 close to the flow channel and seals the end of the spring chamber 8. At the same time, a first step is formed on the first sealing portion 72, and a second step corresponding to the first step is provided on the pressing ring 6. At this time, the first step and the second step are combined to form an installation space (not shown in the figure), and the first sealing ring 10 is installed in the installation space. The first sealing ring 10 seals the end of the spring chamber 8 close to the flow channel, that is, it seals the front of the spring chamber 8.

[0040] The second sealing portion 73 extends from the side of the mounting portion 71 away from the flow channel toward the pressing ring 6 until it extends into the pressing ring 6. At this time, the second sealing portion 73 is located at the end of the spring chamber 8 close to the valve body 1 and seals the end. At the same time, a third step (not shown in the figure) is provided at a position of the pressing ring 6 corresponding to the extended end of the second sealing portion 73. A second sealing ring 11 is provided in the third step. The second sealing ring 11 is located between the pressing ring 6 and the second sealing portion 73. The second sealing ring 11 seals the end of the spring chamber 8 close to the valve body 1, that is, it seals the back of the spring chamber 8.

[0041] The front and back sides of the spring chamber 8 are sealed respectively by the first sealing ring 10 and the second sealing ring 11, thereby preventing the medium from entering the spring chamber 8 from the back side. This can completely prevent the medium from entering the spring chamber 8, thereby preventing the medium from entering the spring chamber 8 and causing the spring 9 to fail and the valve to leak.

[0042] In a preferred embodiment, the first sealing ring 10 and the second sealing ring 11 are both made of flexible graphite. Sealing rings made of flexible graphite are suitable for use in high temperature environments.

[0043] It should be noted that other sealing rings that can adapt to high temperature environments, such as those made of fluororubber, should also be considered within the scope of protection of this application.

[0044] In addition, the valve body 1 is integrally cast to reduce leakage points of the valve flange connection.

[0045] In addition, the sealing surface between the valve seat 3 and the valve core 2 has a knife edge, and the knife edge is set to a scraping structure. The knife edge is adapted to the shape of the surface of the valve core ball. The setting of the scraping knife edge sealing surface can scrape off the adhesive medium on the surface of the valve core 2 ball during the valve switching process, so as to ensure the wear resistance and sealing performance of the valve core 2.

[0046] In addition, the upper valve stem 4 and the lower valve stem 5 are connected to the valve core 2 by a spline (not shown in the figure). The spline connection method can make the valve stem have better centering, large bearing torque, eliminate the fitting clearance between the valve stem and the spherical valve core 2, and improve the service life and adjustment accuracy of the valve.

[0047] Furthermore, if Figure 3-4 As shown, the valve further includes an upper locating bearing 17 and a lower locating bearing 18, wherein:

[0048] See Figure 3 The upper positioning bearing 17 is installed at the matching position of the upper valve stem 4 and the valve body 1, and is used to limit the radial and axial movement of the upper valve stem 4; more specifically, the stuffing box 14 cooperates with the valve body 1 to prevent the axial movement of the upper valve stem 4, and the valve body 1 and the upper valve stem 4 are positioned to prevent the radial movement of the upper valve stem 4.

[0049] See Figure 4 The lower positioning bearing 18 is installed at the cooperation position of the lower valve stem 5 and the valve body 1, and is used to limit the radial and axial movement of the lower valve stem 5; more specifically, a bottom cover 19 is fixed to the bottom of the valve body 1 by bolts, and the lower valve stem 5 cooperates with the bottom cover 19 to prevent the axial movement of the lower valve stem 5, and the valve body 1 is positioned on the lower valve stem 5 to prevent the radial movement of the lower valve stem 5.

[0050] The upper locating bearing 17 and the lower locating bearing 18 are integrally sintered and have good wear resistance and self-lubricating properties, thereby preventing the valve from being stuck due to long-term non-operation.

[0051] The specific implementation principle of the utility model is: the valve stem and the valve core 2 are driven to rotate 90° through a driving device (which can be an existing driving structure such as a motor or manual drive) to realize the switching and cutting functions of the valve. During the switching process, the V-shaped incision of the sphere can cut off the fibrous or granular medium. The first sealing ring 10 and the second sealing ring 11 can completely block the medium from entering the spring cavity 8 from the front and back sides, thereby solving the problem of medium accumulation in the spring cavity 8, causing the spring 9 to get stuck and the pre-tightening to fail, thereby causing the valve sealing to fail.

[0052] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A high-temperature pre-tightening anti-jamming metal hard-sealed V-type ball valve, comprising a valve body with a flow channel, a valve core located in the valve body, a valve seat forming a hard seal with the valve core, an upper valve stem and a lower valve stem connected to the valve core, characterized in that: The valve core is a sphere with a V-shaped cutout. A pressure ring is provided on the side of the valve seat facing away from the valve core. A sealing seat cover is fixed on the outside of the pressure ring, wherein: The sealing seat cover comprises a connected mounting portion, a first sealing portion and a second sealing portion; A spring cavity is formed between the mounting portion and the pressing ring, and a spring is arranged in the spring cavity; The first sealing portion is located at one end of the spring chamber close to the flow channel and seals the end, and a first sealing ring is provided between the first sealing portion and the pressure ring; The second sealing portion is located at one end of the spring chamber close to the valve body and seals the end, and the second sealing portion extends into the pressing ring and a second sealing ring is provided between the second sealing portion and the pressing ring.

2. The high temperature pre-tightening anti-jamming metal hard seal V-type ball valve according to claim 1 is characterized in that: The upper valve stem and the lower valve stem are connected to the valve core by spline matching.

3. The high temperature pre-tightening anti-jamming metal hard seal V-type ball valve according to claim 1 is characterized in that: The spring is a disc spring, and the disc spring is made of Inconel alloy.

4. The high temperature pre-tightening anti-jamming metal hard seal V-type ball valve according to claim 1 is characterized in that: The valve body is cast in one piece.

5. The high temperature pre-tightening anti-jamming metal hard seal V-type ball valve according to claim 1 is characterized in that: The sealing surfaces of the valve seat and the valve core are provided with a knife edge, and the knife edge is configured as a scraping structure.

6. The high temperature pre-tightening anti-jamming metal hard seal V-type ball valve according to claim 1 is characterized in that: The valve body is fixed via a jacket.

7. The high temperature pre-tightening anti-jamming metal hard seal V-type ball valve according to claim 1 is characterized in that: The sealing seat cover is fixed to the valve body by locking bolts.

8. The high temperature pre-tightening anti-jamming metal hard seal V-type ball valve according to claim 1 is characterized in that: The first sealing ring and the second sealing ring are both made of flexible graphite.

9. The high temperature pre-tightening anti-jamming metal hard seal V-type ball valve according to claim 1, characterized in that: A stuffing box is arranged in the valve body, a stuffing gland is arranged on the stuffing box, and the upper valve stem passes through the stuffing box and the stuffing gland and is connected to the valve body via a coupling.

10. The high temperature pre-tightening anti-jamming metal hard seal V-type ball valve according to claim 1, characterized in that: It also includes an upper locating bearing and a lower locating bearing, wherein: The upper positioning bearing is installed at the matching position between the upper valve stem and the valve body, and is used to limit the movement of the upper valve stem in the radial and axial directions; The lower positioning bearing is installed at the matching position of the lower valve stem and the valve body, and is used to limit the movement of the lower valve stem in the radial and axial directions.

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