High-temperature-resistant hard sealing floating ball valve

Abstract

The invention relates to the technical field of valves, in particular to a high-temperature-resistant hard sealing floating ball valve which comprises an axial adjusting assembly, a radial adjusting assembly and a flow guide assembly. The axial adjusting assembly is installed in the valve body channel. The radial adjusting assembly is connected with the axial adjusting assembly; the flow guide assembly is installed in the valve body channel. The axial adjusting assembly and the radial adjusting assembly drive the floating valve seat to move along with the ball body under the pressure of the ball body, abrasion between the ball body and the valve seat when the ball body rotates is reduced, meanwhile, the axial adjusting assembly and the radial adjusting assembly can provide reset force for the ball body, and the axial adjusting assembly and the radial adjusting assembly are matched with the flow guide assembly to balance medium pressure borne by the ball body. Therefore, jamming and friction between the ball body and the floating valve seat in the rotating process of the ball body due to radial deviation and expansion effects are avoided; the problem that when the ball body deviates and expands in the radial direction under the pressure effect of a high-temperature medium, the ball body rotates and is abraded with the valve seat, and sealing fails is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a high-temperature resistant hard-sealed floating ball valve. Background Art

[0002] A ball valve is a valve that controls the flow of fluid by rotating the ball driven by the valve stem. Ball valves are divided into soft-sealed ball valves and hard-sealed ball valves according to the sealing surface material. The sealing ball and valve seat of the hard-sealed ball valve are both made of metal, while the soft-sealed ball valve usually has one or both sealing surfaces made of soft materials. Compared with soft-sealed ball valves, hard-sealed ball valves can perform well in high temperature, high pressure, corrosive media or media carrying particulate matter.

[0003] The ball of the floating ball valve is a floating structure, and the ball can produce a certain displacement under the action of the medium pressure, so that the ball can be pressed against the sealing surface. In order to ensure the sealing performance, the floating ball valve currently on the market will add a disc spring between the upstream valve seat and the upstream valve body, so that the upstream valve seat is always in contact with the ball. However, when conveying high-temperature media, the disc spring between the upstream valve seat and the valve body will reduce the preload force under the influence of the high-temperature medium, resulting in unstable sealing. In addition, when the ball expands due to high temperature, it will cause the ball to lock and cannot be closed. The prior art has proposed a solution, such as a high-temperature resistant The wear-resistant hard-sealed floating ball valve sets the valve seat of the ball valve as a displaceable structure, and arranges a disc spring and a graphite packing between the valve seat and the valve body. The disc spring squeezes the graphite packing to seal the side of the stuffing box close to the channel, preventing the high-temperature medium in the channel from entering the stuffing box and affecting the disc spring. Compared with the current sealing method using a dust ring, it is more reliable under high-temperature conditions and helps the disc spring to provide a more lasting preload to ensure the sealing performance of the valve; and under the action of the medium pressure, the reaction force of the disc spring on the valve seat can be used to adjust the center position of the valve seat and the ball, thereby reducing the torque of the valve stem and preventing the ball from expanding due to high temperature and causing locking.

[0004] Although the prior art solves the problem that the disc springs at the upstream valve seat and the valve body are easily affected by the high-temperature medium, resulting in a decrease in sealing performance and the ball is locked under high-temperature expansion, there are still the following problems: although disc springs are arranged on both sides and the disc springs are not in direct contact with the high-temperature medium, it can help reduce the decrease in sealing performance caused by the disc springs being affected by high temperature, and although the disc springs can help the ball to be able to adjust axial movement to prevent locking and improve sealing performance, during the process of adjusting the flow or closing, the ball rotates to a small opening and closing degree, and the pressure of the medium on the ball will cause the ball to generate an unbalanced torque, which will cause the ball to have a certain degree of radial displacement (refer to Figure 1), since the ball and valve seat of the hard-seal floating ball valve are both made of metal, the matching accuracy is high. However, under the action of radial deviation and expansion, it will cause obstruction and friction between the ball and the valve seat during the rotation of the ball, which will cause wear on the sealing surface and reduce the sealing effect.

[0005] In view of the above situation, in order to overcome the above technical problems, the present invention provides a high temperature resistant hard seal floating ball valve. Summary of the invention

[0006] The present invention provides a high-temperature resistant hard-sealed floating ball valve, which solves the problem of seal failure caused by wear between the ball and the valve seat during rotation when the ball is radially offset and expanded under the action of high-temperature medium pressure. The floating valve seat is driven to move with the ball under the pressure of the ball by an axial adjustment component and a radial adjustment component, thereby reducing the wear between the ball and the valve seat during rotation. At the same time, the axial adjustment component and the radial adjustment component provide a restoring force to the ball, and cooperate with the guide component to balance the medium pressure on the ball, thereby avoiding radial offset and expansion to cause jamming and friction between the ball and the floating valve seat during rotation.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A high temperature resistant hard seal floating ball valve comprises a valve body channel, a ball and a rotating shaft; further comprising an axial adjustment component, a radial adjustment component, a floating valve seat and a flow guide component; the axial adjustment component is installed in the valve body channel; the radial adjustment component is connected to the axial adjustment component; the floating valve seat is symmetrically slidably installed at both ends of the valve body channel; the flow guide component is installed in the valve body channel; during the ball rotating to the valve body channel to flow medium, the rotating shaft drives the flow guide component to rotate, the ball is axially offset and radially offset under the medium pressure, the axial adjustment component and the radial adjustment component drive the floating valve seat to deflect with the ball under the ball displacement pressure, part of the medium at the position where the ball contacts the floating valve seat on the side of the medium inflow direction flows into the flow guide component, the flow guide component guides the inflowing medium to the position where the ball contacts the floating valve seat on the side of the medium outflow direction, thereby achieving pressure relief at the high pressure position and pressurization at the low pressure position, after the medium flows out, the floating valve seat is pressed and the floating valve seat is generated through the floating valve seat to the ball to generate pressure to the ball center position before the ball is deflected, so as to help the ball to be corrected.

[0009] Preferably, the valve body channel includes an upstream channel, an intermediate channel, a downstream channel and a clamping rubber; the two clamping rubbers are respectively connected between the upstream channel and the intermediate channel and between the downstream channel and the intermediate channel; the axial adjustment assembly includes an axial slide groove, a disc spring and a pressure relief groove; the two axial slide grooves are symmetrically opened on the upstream channel and the downstream channel; the two disc springs are symmetrically slidably installed in the axial slide groove; the circular array of pressure relief grooves is opened in the upstream channel.

[0010] In the above scheme, the floating valve seat can move axially through the axial slide groove and the disc spring, so as to ensure that the floating valve seat can remain pressed against the ball in a sealed state under the medium pressure. When the ball rotates to open the channel slightly, the medium pressure at the contact position between the ball and the floating valve seat is greater than the medium pressure at the non-contact position. At this time, the elastic force of the disc spring can press the floating valve seat on the ball, and the medium pressure will cause the ball to deviate radially. At this time, part of the medium at the contact position between the ball and the floating valve seat will flow into the pressure relief groove, thereby reducing the pressure of the medium on the ball and reducing the radial deviation of the ball.

[0011] Preferably, the floating valve seat and the upstream channel are fitted together when the ball does not slide axially; sealing grooves are provided on the upstream channel and the downstream channel; the floating valve seat includes a valve seat body, a contraction groove and a sealing ring block; the valve seat body is symmetrically arranged on both sides of the middle channel; the contraction groove is provided on the valve seat body; and the sealing ring block is slidably installed on the contraction groove.

[0012] In the above scheme, the floating valve seat and the upstream channel are fitted together when the ball does not slide axially. When the medium pressure increases and the floating valve seat slides, part of the medium can be diverted to the pressure relief groove. During the pressure relief process, the sealing ring block can isolate the high-temperature medium from the disc spring. Since the sealing ring block is a telescopic structure, the sealing ring block can remain connected to the sealing groove during the sliding of the floating valve seat, and since it slides axially in the contraction groove, the sealing effect is maintained.

[0013] Preferably, the outer wall diameter of the sealing ring block is smaller than the maximum diameter of the sealing groove, and the inner wall diameter of the sealing ring block is smaller than the minimum diameter of the sealing groove.

[0014] In the above scheme, the sealing ring block can perform axial sliding sealing and radial sliding in the sealing groove, ensuring that when the floating valve seat slides radially with the ball, the sealing slider can move radially with the floating valve seat and the ball.

[0015] Preferably, the radial adjustment assembly includes a radial adjustment groove, an adjustment spring and a connecting ring block; the radial adjustment groove is opened on the end face of the floating valve seat; the adjustment spring is circumferentially arranged on the radial adjustment groove; the connecting ring block is connected between the disc spring and the adjustment spring, the outer wall diameter of the connecting ring block is smaller than the maximum diameter of the radial adjustment groove, and the inner wall diameter of the connecting ring block is larger than the minimum diameter of the radial adjustment groove.

[0016] In the above scheme, the floating valve seat is set as a movable structure in the radial direction. When the floating valve seat is squeezed by the expansion of the ball, the floating valve seat can move radially, and the radial deviation of the ball is offset to reduce the friction between the ball and the floating valve seat. At the same time, the restoring force of the spring helps the ball resist the deflection torque generated by the medium on the ball.

[0017] Preferably, a through hole array is provided on the upper circumferential surface of the clamping rubber; the flow guide assembly includes a flow guide channel, a flow outlet and a pressure piece; the flow guide channel is provided in the middle channel; the flow outlet is provided at the tail of the flow guide channel; and the pressure piece is arranged at the floating valve seat position of the downstream channel.

[0018] In the above scheme, the medium part at the contact position between the ball and the floating valve seat enters the pressure relief groove, and then flows into the guide channel through the pressure relief groove and the through hole. The guide channel can guide the medium to the floating valve seat position of another downstream channel, thereby helping to adjust the floating valve seat position.

[0019] Preferably, the guide channel is a spiral structure, and the number of spiral turns of the guide channel is half a turn, and the pressure relief groove and the outflow outlet connected to the single guide channel are symmetrical about the center of the sphere when it is not under pressure.

[0020] In the above scheme, the diversion channel diverts the medium to a position symmetrical to the center of the original sphere, so that the liquid at the valve seat position can be depressurized from the contact position between the sphere and the floating valve seat, and the pressure is increased at a position symmetrical to the center of the original sphere, thereby helping the sphere to be corrected. Moreover, since the diversion channel is arranged in a circular array, more medium with a higher pressure enters the diversion channel at a position with high medium pressure, while the pressure entering the diversion channel at a position with low medium pressure is also low, thereby helping the sphere to be subjected to opposite forces and helping the sphere to be corrected in deviation.

[0021] Preferably, the pressure member includes a thrust ring, an outer contraction groove, an outer sealing ring and an outer sealing groove; the thrust ring is connected to the floating valve seat at the downstream channel position; the outer contraction groove is opened on the floating valve seat; the outer sealing ring is slidably installed on the floating valve seat; the outer sealing groove is symmetrically opened on the upstream channel and the downstream channel.

[0022] In the above scheme, when the ball valve is in the closed state, the medium will generate axial pressure on the ball, causing the ball to press against the floating valve seat at the downstream channel position. Since the outer sealing ring and the thrust ring turn the outer ring of the floating valve seat at the downstream channel into a closed space, the medium flowing into the intermediate channel through the guide channel will generate pressure on the thrust ring, so that the thrust ring can push the floating valve seat at the downstream channel position toward the ball. At this time, the ball and the floating valve seat will have a movement trend in opposite directions, so that the floating valve seat and the ball fit more closely, improving the sealing performance. After the floating valve seat at the downstream channel position pushes the ball to the floating valve seat at the upstream channel position to press and close the pressure relief groove, the pressure generated by the medium on the thrust ring can be reduced. At this time, the ball can complete dynamic sealing during the floating process to ensure that the sealing pressure ratio is controlled within a good range, thereby further improving the sealing effect. In addition, the outer sealing ring can block the medium from flowing from the outer ring to the disc spring position.

[0023] Preferably, a filter screen is provided at the inlet of the pressure relief groove; and the outflow port is obliquely oriented toward a floating valve seat at a downstream channel position.

[0024] In the above scheme, the filter can prevent particles in the medium from entering the pressure relief groove and the guide channel, avoiding blockage of the guide channel. The inclined structure of the flow outlet can push the medium flowing out of the floating valve seat toward the ball, further improving the sealing performance.

[0025] Preferably, the sealing ring block is made of a ceramic material doped with magnetic particles; and the sealing groove is made of a material that is attracted to the sealing ring block.

[0026] In the above scheme, since the sealing ring block and the sealing groove are attracted and fitted by magnetic material, and the ceramic material can increase the heat insulation effect, the magnetic material here can be replaced by a spring to press the sealing ring block against the sealing groove. Compared with the use of springs, the magnetic material can provide better sealing and a more stable sealing effect under vibration.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. Compared with the existing hard-sealed floating ball valve, the present invention provides a radial adjustment component and an axial adjustment component. When the ball undergoes radial displacement, axial displacement and thermal expansion, the radial adjustment component and the axial adjustment component can drive the floating valve seat to move with the ball and fit well with the ball under the pressure of the ball, thereby reducing the friction between the ball and the floating valve seat, so that the sealing pressure ratio of the ball and the floating valve seat is controlled within a reasonable range. In addition, the restoring force of the radial adjustment component and the axial adjustment component can help the ball to reset its displacement, thereby reducing the friction between the ball and the floating valve seat when rotating, extending the service life of the floating valve seat, and further ensuring its sealing performance.

[0029] 2. The present invention provides a flow guide component and a pressure relief groove on the upstream channel, so that when the ball is opened and closed with a small amplitude and during the closing process, part of the medium at the contact position between the ball and the floating valve seat will flow into the pressure relief groove, thereby reducing the pressure of the medium on the ball and reducing the radial deviation of the ball. The medium at the high pressure position can be guided to the symmetrical position about the center of the original sphere through the spiral flow guide channel, so that while relieving the pressure at the high pressure position, a balanced opposite force is given to the ball to help the ball to correct the deviation, thereby reducing the friction between the ball and the floating valve seat when it rotates, avoiding the ball from locking and being unable to rotate, and ensuring the sealing effect.

[0030] 3. The present invention sets a pressure piece. When the ball valve is in the closed state, the medium will generate axial pressure on the ball, so that the ball presses the floating valve seat at the downstream channel position to improve the sealing performance. The medium flowing into the middle channel through the guide channel will generate pressure on the thrust ring, so that the thrust ring can push the floating valve seat at the downstream channel position toward the ball, thereby making the floating valve seat and the ball fit more closely and improving the sealing performance. After the floating valve seat at the downstream channel position pushes the ball to the floating valve seat at the upstream channel position to press and close the pressure relief groove, the pressure generated by the medium on the thrust ring can be reduced. At this time, the ball can complete dynamic sealing during the floating process, ensuring that the sealing pressure ratio is controlled within a good range to avoid damage to the sealing surface due to excessive pressing force, and maintaining a good seal between the floating valve seats and the ball on both sides, thereby further improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of a radially offset state of a floating ball valve in the prior art;

[0033] Figure 2 It is the overall structure diagram of the present invention;

[0034] Figure 3 is a cross-sectional view of the present invention;

[0035] Figure 4 yes Figure 3 A magnified view of the structure at center;

[0036] Figure 5 It is a schematic diagram of the connection between the floating valve seat and the radial adjustment assembly of the present invention;

[0037] Figure 6 is a perspective view of the diversion channel of the present invention;

[0038] Figure 7 yes Figure 3 A magnified view of the structure at B in the middle;

[0039] Figure 8 yes Figure 4 A magnified view of the structure at C in the middle;

[0040] In the figure: 1. valve body channel; 11. upstream channel; 111. sealing groove; 12. middle channel; 13. downstream channel; 14. clamping rubber; 141. through hole; 2. sphere; 3. rotating shaft; 4. axial adjustment assembly; 41. axial slide groove; 42. disc spring; 43. pressure relief groove; 431. filter screen; 5. radial adjustment assembly; 51. radial adjustment groove; 52. adjustment spring; 53. connecting ring block; 6. floating valve seat; 61. valve seat body; 62. contraction groove; 63. sealing ring block; 7. guide assembly; 71. guide channel; 72. outflow port; 73. pressure piece; 731. thrust ring; 732. outer contraction groove; 733. outer sealing ring; 734. outer sealing groove. DETAILED DESCRIPTION

[0041] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0042] See also Figures 1 to 8 The present invention provides a high temperature resistant hard seal floating ball valve, and the technical solution is as follows:

[0043] As a specific embodiment of the present invention, refer to Figure 1 and Figure 2A high temperature resistant hard seal floating ball valve comprises a valve body channel 1, a ball 2 and a rotating shaft 3; further comprising an axial adjustment component 4, a radial adjustment component 5, a floating valve seat 6 and a flow guide component 7; the axial adjustment component 4 is installed in the valve body channel 1; the radial adjustment component 5 is connected to the axial adjustment component 4; the floating valve seat 6 is symmetrically slidably installed at both ends of the valve body channel 1; the flow guide component 7 is installed in the valve body channel 1; when the ball 2 rotates to the valve body channel 1 to flow the medium, the rotating shaft 3 drives the flow guide component 7 to rotate, and the ball 2 deviates axially and radially under the medium pressure. The axial adjustment component 4 and the radial adjustment component 5 drive the floating valve seat 6 to deviate together with the ball 2 under the displacement pressure of the ball 2, and the ball 2 is aligned with the inflow direction of the medium. Part of the medium at the contact position of the floating valve seat 6 on the side flows into the guide component 7, and the guide component 7 guides the inflowing medium to the contact position of the ball 2 and the floating valve seat 6 on the side of the medium outflow direction. At this time, part of the medium at the high-pressure position is guided to the low-pressure position, which helps the ball 2 to balance the pressure. After the medium flows out, it presses the floating valve seat 6 and generates pressure on the ball 2 toward the position of the ball center before the ball 2 is deflected through the floating valve seat 6, thereby correcting the radial deviation of the ball 2 to avoid the ball 2 from being locked due to the torque generated by the deviation between the axis of the ball center and the axis of the rotating shaft 3 when the ball 2 rotates. When the ball 2 expands, the floating valve seat 6 moves axially to both sides of the valve body channel 1 and fits on the ball 2, so that the friction force on the ball 2 is reduced when the ball 2 rotates.

[0044] As a specific embodiment of the present invention, refer to Figure 2 , Figure 3 and Figure 4 The valve body channel 1 includes an upstream channel 11, an intermediate channel 12, a downstream channel 13 and a clamping rubber 14; the two clamping rubbers 14 are respectively connected between the upstream channel 11 and the intermediate channel 12 and between the downstream channel 13 and the intermediate channel 12; the axial adjustment component 4 includes an axial slide groove 41, a disc spring 42 and a pressure relief groove 43; the two axial slide grooves 41 are symmetrically opened on the upstream channel 11 and the downstream channel 13; the two disc springs 42 are symmetrically slidably installed in the axial slide groove 41; the pressure relief groove 43 is opened in a circular array in the upstream channel 11. The axial groove 41 and the disc spring 42 are arranged to enable the floating valve seat 6 to move axially, thereby ensuring that the floating valve seat 6 can remain pressed against the ball 2 in a sealed state under medium pressure. When the ball 2 rotates until the channel is slightly opened, the medium pressure at the contact position between the ball 2 and the floating valve seat 6 is greater than the medium pressure at the non-contact position. At this time, the elastic force of the disc spring 42 can press the floating valve seat 6 against the ball 2. In addition, the medium pressure will cause the ball 2 to deviate radially. At this time, part of the medium at the contact position between the ball 2 and the floating valve seat 6 will flow into the pressure relief groove 43, thereby reducing the pressure of the medium on the ball 2 and reducing the radial deviation of the ball 2.

[0045] As a specific embodiment of the present invention, refer to Figure 2 , Figure 3 , Figure 5 and Figure 8 , the floating valve seat 6 and the upstream channel 11 are fitted together when the ball 2 does not slide axially; the upstream channel 11 and the downstream channel 13 are provided with sealing grooves 111; the floating valve seat 6 includes a valve seat body 61, a contraction groove 62 and a sealing ring block 63; the valve seat body 61 is symmetrically arranged on both sides of the intermediate channel 12; the contraction groove 62 is provided on the valve seat body 61; the sealing ring block 63 is slidably installed on the contraction groove 62. The floating valve seat 6 and the upstream channel 11 are fitted together when the ball 2 does not slide axially, and when the medium pressure increases and the floating valve seat 6 slides, part of the medium can be diverted to the pressure relief groove 43, and the sealing ring block 63 can isolate the high-temperature medium from the disc spring 42 during the pressure relief process, and the sealing ring block 63 is a telescopic structure, so that when the floating valve seat 6 slides, the sealing ring block 63 can remain connected to the sealing groove 111, and because it slides axially in the contraction groove 62, the sealing effect is maintained.

[0046] As a specific embodiment of the present invention, refer to Figure 8 The outer wall diameter of the sealing ring block 63 is smaller than the maximum diameter of the sealing groove 111, and the inner wall diameter of the sealing ring block 63 is smaller than the minimum diameter of the sealing groove 111. The sealing ring block 63 can perform axial sliding sealing, and it can also slide radially in the sealing groove 111, ensuring that when the floating valve seat 6 follows the ball 2 to slide radially, the sealing slider can move radially with the floating valve seat 6 and the ball 2.

[0047] As a specific embodiment of the present invention, refer to Figure 7 The radial adjustment assembly 5 includes a radial adjustment groove 51, an adjustment spring 52 and a connecting ring block 53; the radial adjustment groove 51 is provided on the end face of the floating valve seat 6; the adjusting spring 52 is arranged on the radial adjustment groove 51; the connecting ring block 53 is connected between the disc spring 42 and the adjusting spring 52, the outer wall diameter of the connecting ring block 53 is smaller than the maximum diameter of the radial adjustment groove 51, and the inner wall diameter of the connecting ring block 53 is larger than the minimum diameter of the radial adjustment groove 51. The floating valve seat 6 is set as a movable structure in the radial direction. When the floating valve seat 6 is expanded and squeezed by the ball 2, the floating valve seat 6 can move radially, and the radial displacement of the ball 2 is offset to reduce the friction between the ball 2 and the floating valve seat 6, and the restoring force of the spring helps the ball 2 resist the deflection torque generated by the medium on the ball 2.

[0048] As a specific embodiment of the present invention, refer to Figure 5 , Figure 6 and Figure 7 , the compression rubber 14 is provided with through holes 141 in a circumferential array; the flow guide assembly 7 includes a flow guide channel 71, a flow outlet 72 and a pressure piece 73; the flow guide channel 71 is provided in the middle channel 12, and the flow guide channel 71 is provided in a circumferential array, and the specific number can be adjusted according to the required reset accuracy, and since the middle position of the middle channel 12 needs to be provided with a shaft hole for installing the shaft 3, the flow guide channel 71 can be provided around the shaft hole position; the flow outlet 72 is provided at the tail of the flow guide channel 71; the pressure piece 73 is provided at the floating valve seat 6 position of the downstream channel 13. The medium part at the contact position between the ball 2 and the floating valve seat 6 enters the pressure relief groove 43, and then flows into the flow guide channel 71 through the pressure relief groove 43 and the through hole 141, and the flow guide channel 71 can guide the medium to the floating valve seat 6 position of the downstream channel 13, thereby helping to adjust the floating valve seat 6 position.

[0049] As a specific embodiment of the present invention, refer to Figure 2 , Figure 3 and Figure 6 The guide channel 71 is a spiral structure, and the number of spiral turns of the guide channel 71 is half a turn. The guide channel 71 guides the medium to a position symmetrical to the center of the original sphere 2, so that the liquid at the valve seat position can be depressurized from the contact position between the sphere 2 and the floating valve seat 6, and the pressure is increased at the position symmetrical to the center of the original sphere 2, so as to help the sphere 2 to be corrected. Moreover, since the guide channel 71 is arranged in a circular array, the medium at the position with high pressure enters the guide channel 71 with more medium and higher pressure, while the medium at the position with low pressure enters the guide channel 71 with the same low pressure, so as to help the sphere 2 to be subjected to the opposite force and help the sphere 2 to be corrected.

[0050] As a specific embodiment of the present invention, refer to Figure 7The pressure member 73 includes a thrust ring 731, an outer contraction groove 732, an outer sealing ring 733 and an outer sealing groove 734; the thrust ring 731 is connected to the floating valve seat 6 at the position of the downstream channel 13, and the diameter of the thrust ring 731 is equal to the diameter of the inner wall of the intermediate channel 12; the outer contraction groove 732 is opened on the floating valve seat 6; the outer sealing ring 733 is slidably installed on the floating valve seat 6; the outer sealing groove 734 is symmetrically opened on the upstream channel 11 and the downstream channel 13. When the ball valve is in the closed state, the medium will generate axial pressure on the ball 2 so that the ball 2 presses the floating valve seat 6 at the downstream channel 13. Since the outer sealing ring 733 and the thrust ring 731 turn the outer ring of the floating valve seat 6 at the downstream channel 13 into a closed space, the medium flowing into the intermediate channel 12 through the guide channel 71 will generate pressure on the thrust ring 731, so that the thrust ring 731 can push the floating valve seat 6 at the downstream channel 13 toward the ball 2. At this time, the ball 2 and the floating valve seat 6 will have a movement trend in opposite directions. The floating valve seat 6 and the ball 2 fit more closely, improving the sealing performance. After the floating valve seat 6 at the downstream channel 13 pushes the ball 2 to the floating valve seat 6 at the upstream channel 11 to press and close the pressure relief groove 43, the pressure generated by the medium on the thrust ring 731 can be reduced. At this time, the ball 2 can complete dynamic sealing during the floating process to ensure that the sealing pressure ratio is controlled within a good range, thereby further improving the sealing effect. In addition, the outer sealing ring 733 can block the medium from flowing from the outer ring to the disc spring 42 position, thereby ensuring the service life of the disc spring 42.

[0051] As a specific embodiment of the present invention, refer to Figure 8 A filter screen 431 is provided at the entrance of the pressure relief groove 43; the outlet 72 is obliquely oriented toward the floating valve seat 6 at the downstream channel 13. The filter screen 431 can prevent particles in the medium from entering the pressure relief groove 43 and the guide channel 71, and prevent the guide channel 71 from being blocked. The oblique structure of the outlet 72 can push the medium flowing out of the floating valve seat 6 toward the ball 2, further improving the sealing performance.

[0052] As a specific embodiment of the present invention, refer to Figure 2 and Figure 8 The sealing ring block 63 is made of ceramic material doped with magnetic particles; the sealing groove 111 is made of a material that attracts the sealing ring block 63. Since the sealing ring block 63 and the sealing groove 111 are attracted and fitted by magnetic material, and the ceramic material can increase the heat insulation effect, the magnetic material can be replaced by a spring to press the sealing ring block 63 against the sealing groove 111. Compared with the spring, the magnetic material can provide better sealing performance and a more stable sealing and fitting effect under vibration.

[0053] Working process: When the ball valve is not closed, the ball 2 undergoes axial displacement, radial displacement and thermal expansion under the pressure of the medium. At this time, under the pressure of the ball 2, the axial adjustment component 4 and the radial adjustment component 5 drive the floating valve seat 6 to deviate along with the ball 2, so that the pressure and friction between the ball 2 and the floating valve seat 6 are reduced. The axial adjustment component 4 and the radial adjustment component 5 respectively correct the ball 2 to the original spherical center position under the action of the restoring force of the disc spring 42 and the adjustment spring 52. When the ball 2 is subjected to the medium flowing from the upstream channel 11, the contact position of the floating valve seat 6 at the upstream channel 11 and the ball 2 is subjected to a higher medium pressure. The medium here pushes the floating valve seat 6 to slide. At this time, part of the medium flows from the pressure relief groove 43 into the guide channel 71, and finally flows to the symmetrical position about the original spherical center, so that the ball 2 is subjected to the opposite balancing force, thereby completing the correction of the ball.

[0054] Specifically, when a floating ball valve is used to transport high-temperature media, during the process of the ball 2 being slightly opened or rotated, the ball 2 will be subjected to the media pressure from the upstream channel 11. At this time, the pressure on the side where the media flows is less than the pressure on the side where the ball 2 contacts the floating valve seat 6. At this time, the ball 2 will undergo radial and axial displacement under the media pressure. The displacement of the ball 2 squeezes the floating valve seat 6, and the elastic force of the disc spring 42 presses the floating valve seat 6 against the ball 2. The radial displacement of the ball 2 will cause the floating valve seat 6 to squeeze the adjusting spring 52, and cause the floating valve seat 6 to undergo radial displacement along with the ball 2, thereby avoiding the ball 2 and the floating valve seat 6 from being displaced. The pressure between the ball 2 and the floating valve seat 6 is too large, causing wear on the floating valve seat 6 when the ball 2 rotates, and at this time, the floating valve seat 6 will drive the ball 2 to resist the medium pressure under the action of the restoring force of the adjusting spring 52, helping the ball 2 to correct the deviation toward the original ball center; when the floating valve seat 6 at the position of the upstream channel 11 slides, the pressure relief groove 43 remains open, and part of the medium flows into the pressure relief groove 43 to help reduce the pressure on the side of the ball 2 in contact with the floating valve seat 6, and the medium flowing into the pressure relief groove 43 will be guided by the guide channel 71 to the position symmetrical with respect to the original ball center, thereby generating a pressure relief groove 43 on the ball 2 at the position of the downstream channel 13 that is symmetrical with the upstream channel The force against the pressure of the ball 2 at the position 11 is used to assist the axial adjustment component 4 and the radial adjustment component 5 to reset the ball 2; when the ball valve is closed, the medium pressure at the position of the upstream channel 11 will act axially on the ball 2. At this time, the ball 2 presses the floating valve seat 6 at the position of the downstream channel 13. When the pressing force is too large and the sealing pressure ratio is too large, a gap will be generated between the floating valve seat 6 at the position of the upstream channel 11 and the upstream channel 11. At this time, the pressure relief groove 43 is opened, and part of the medium enters the pressure relief groove 43. At this time, the medium flows through the guide channel 71 to the sealing space formed by the outer sealing ring 733 and the thrust ring 731. The floating valve seat 6 at the downstream channel 13 is pressed to move in the opposite direction to the ball 2, thereby ensuring the sealing performance while adjusting the sealing pressure ratio to avoid damage to the sealing surface caused by excessive sealing pressure ratio. When the medium pressure on the ball 2 decreases, the floating valve seat 6 at the downstream channel 13 pushes in the direction of the upstream channel 11 to slide axially, the sealing pressure ratio between the ball 2 and the floating valve seat 6 at the upstream channel 11 increases, and the floating valve seat 6 is pressed against the upstream channel 11, thereby closing the pressure relief groove 43. At this time, the floating valve seats 6 on both sides are pressed against the ball 2 to form a dynamic seal, maintaining a good sealing pressure ratio, thereby improving the sealing performance.

[0055] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A high temperature resistant hard seal floating ball valve, comprising a valve body channel (1), a ball (2) and a rotating shaft (3); characterized in that: The invention also comprises an axial adjustment component (4), a radial adjustment component (5), a floating valve seat (6) and a flow guide component (7); the axial adjustment component (4) is installed in the valve body channel (1); the radial adjustment component (5) is connected to the axial adjustment component (4); the floating valve seat (6) is symmetrically slidably installed at both ends of the valve body channel (1); the flow guide component (7) is installed in the valve body channel (1); the axial adjustment component (4) and the radial adjustment component (5) drive the floating valve seat (6) to deviate together with the ball (2) under the displacement pressure of the ball (2), and part of the medium at the contact position between the ball (2) and the floating valve seat (6) on the medium inflow direction side flows into the flow guide component (7), and the flow guide component (7) guides the inflowing medium to the contact position between the ball (2) and the floating valve seat (6) on the medium outflow direction side, and after the medium flows out, it presses the floating valve seat (6) and generates a reverse force on the deviated ball (2) through the floating valve seat (6).

2. A high temperature resistant hard seal floating ball valve according to claim 1, characterized in that: The valve body channel (1) includes an upstream channel (11), an intermediate channel (12), a downstream channel (13) and a clamping rubber (14); the two clamping rubbers (14) are respectively connected between the upstream channel (11) and the intermediate channel (12) and between the downstream channel (13) and the intermediate channel (12); the axial adjustment component (4) includes an axial slide groove (41), a disc spring (42) and a pressure relief groove (43); the two axial slide grooves (41) are symmetrically arranged on the upstream channel (11) and the downstream channel (13); the two disc springs (42) are symmetrically slidably installed in the axial slide grooves (41); the pressure relief grooves (43) are arranged in a circular array on the upstream channel (11).

3. A high temperature resistant hard seal floating ball valve according to claim 2, characterized in that: The floating valve seat (6) and the upstream channel (11) are fitted together when the ball (2) does not slide axially; the upstream channel (11) and the downstream channel (13) are provided with sealing grooves (111); the floating valve seat (6) comprises a valve seat body (61), a contraction groove (62) and a sealing ring block (63); the valve seat body (61) is symmetrically arranged on both sides of the middle channel (12); the contraction groove (62) is provided on the valve seat body (61); and the sealing ring block (63) is slidably installed on the contraction groove (62).

4. A high temperature resistant hard seal floating ball valve according to claim 3, characterized in that: The outer wall diameter of the sealing ring block (63) is smaller than the maximum diameter of the sealing groove (111), and the inner wall diameter of the sealing ring block (63) is smaller than the minimum diameter of the sealing groove (111).

5. A high temperature resistant hard seal floating ball valve according to claim 2, characterized in that: The radial adjustment component (5) comprises a radial adjustment groove (51), an adjustment spring (52) and a connecting ring block (53); the radial adjustment groove (51) is formed on the end surface of the floating valve seat (6); the adjustment spring (52) is circumferentially arranged on the radial adjustment groove (51); the connecting ring block (53) is connected between the disc spring (42) and the adjustment spring (52); the outer wall diameter of the connecting ring block (53) is smaller than the maximum diameter of the radial adjustment groove (51), and the inner wall diameter of the connecting ring block (53) is larger than the minimum diameter of the radial adjustment groove (51).

6. A high temperature resistant hard seal floating ball valve according to claim 2, characterized in that: The compression rubber (14) is provided with through holes (141) in a circumferential array; the flow guide assembly (7) comprises a flow guide channel (71), a flow outlet (72) and a pressure piece (73); the flow guide channel (71) is provided in the middle channel (12); the flow outlet (72) is provided at the tail of the flow guide channel (71); and the pressure piece (73) is arranged at the position of the floating valve seat (6) of the downstream channel (13).

7. A high temperature resistant hard seal floating ball valve according to claim 6, characterized in that: The flow guiding channel (71) is a spiral structure, and the number of spiral turns of the flow guiding channel (71) is half a turn. The pressure relief groove (43) and the outflow outlet (72) connected by the single flow guiding channel (71) are symmetrical about the center of the sphere (2) when it is not under pressure.

8. The high temperature resistant hard seal floating ball valve according to claim 2, characterized in that: The pressure member (73) comprises a thrust ring (731), an outer contraction groove (732), an outer sealing ring (733) and an outer sealing groove (734); the thrust ring (731) is connected to the floating valve seat (6) at the position of the downstream channel (13); the outer contraction groove (732) is provided on the floating valve seat (6); the outer sealing ring (733) is slidably mounted on the floating valve seat (6); and the outer sealing groove (734) is symmetrically provided on the upstream channel (11) and the downstream channel (13).

9. A high temperature resistant hard seal floating ball valve according to claim 7, characterized in that: A filter screen (431) is provided at the entrance of the pressure relief groove (43); the outflow port (72) is obliquely oriented toward the floating valve seat (6) at the downstream channel (13).

10. The high temperature resistant hard seal floating ball valve according to claim 3, characterized in that: The sealing ring block (63) is made of a ceramic material doped with magnetic particles; the sealing groove (111) is made of a material that is attracted to the sealing ring block (63).

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