High-performance compensated shear valve

Abstract

The present invention belongs to the technical field of industrial valves, especially high-performance compensating shear valves. Aiming at the problem that the increase in the pressure value on one side inside the valve body may cause high-pressure fluid to flow out from the gap and lead to the distortion of the valve core, the following solution is proposed. It includes a main valve body with a cavity I inside. At the opening of the main valve body close to the cavity I, a liquid inlet end cover is fixed by bolts. A cavity II is reserved on the side of the liquid inlet end cover close to the cavity I. Liquid inlet hole I and liquid outlet hole II that horizontally extend and pass through the center of the spherical chamber are respectively reserved on the sides of the main valve body and the liquid inlet end cover that face away from each other. When the present invention is in use, when the valve is closed and if the foreseeable pressure is to increase, only need to control the sliding push rod to move downward to push the top ball downward. At this time, under the action of the inclined surface of the locking compensation block, the top ball can tightly squeeze the pressing rib plate and the hemispherical shell core against the orifice of the liquid inlet hole I, thereby preventing the further expansion of the gap and causing fluid overflow.

Description

Technical Field

[0001] The invention relates to the technical field of industrial valves, and in particular to a high-performance compensating shear valve. Background Art

[0002] Compensated shear valve is a specially designed shear valve that is mainly used to accurately control fluid flow and can automatically compensate for the effects of changes in fluid characteristics (such as pressure, temperature or flow rate changes) under different working conditions. This valve is usually used in high-demand industrial applications to maintain stable performance and ensure that the system can still achieve the predetermined control target under various working conditions.

[0003] After searching, it is found that when the shear valve in the prior art encounters a sudden increase in pressure after closing, that is, the pressure value inside the valve body increases, the fluid that is controlled to be closed will expand the gap between the valve core and the valve body and overflow. If no compensation control is performed, once the gap is expanded, more and more will flow, and the gap will be expanded larger and larger, resulting in the inability to close the valve tightly at the later stage, and the stains on the surface of the valve core will not be scrapped thoroughly, which will lead to a series of problems and eventually the valve body will be scrapped. In order to solve the problem that the pressure value on one side of the valve body may increase, which may cause high-pressure fluid to flow out of the gap and cause the valve core to twist, we propose a new shear valve with a pressure compensation mechanism. Summary of the invention

[0004] In order to solve the technical problem that the pressure value on one side of the valve body increases, which may cause the high-pressure fluid to flow out of the gap and cause the valve core to twist, the present invention adopts the following technical solution:

[0005] A high-performance compensating shear valve comprises a main valve body with a cavity 1 therein, a liquid inlet end cover is fixed by bolts at the opening of the main valve body near the cavity 1, a cavity 2 is reserved on the side of the liquid inlet end cover near the cavity 1, and a liquid inlet hole 1 and a liquid outlet hole 2 which extend horizontally and pass through the center of the spherical chamber are reserved on the opposite sides of the main valve body and the liquid inlet end cover; a shaft neck tube which extends vertically upward is reserved at the top of the outer wall of the main valve body, and a support platform is reserved at the top of the shaft neck tube; a plurality of mutually parallel connecting rods are fixed at the top of the supporting platform, and a mounting base is arranged at the top of the connecting rods; the upper surface of the mounting base is divided into A driving mechanism and an outer cover module are separately provided; a valve stem module is provided in the shaft neck tube, and the valve stem module includes a main transmission tube rotatably connected in the shaft neck tube, and a hemispherical shell top core with a melon-shaped structure is fixed at the bottom end of the main transmission tube; and a tightening rib plate extending toward the center of the ball is fixed on the inner arc side of the hemispherical shell top core; the internal sealing sliding connection of the main transmission tube is provided with a sliding rod, and a dense spring is fixed at the bottom end of the sliding rod, and a top ball is fixed at the bottom end of the dense spring; a locking compensation block extending toward the middle is fixed on the inner wall of the cavity one near the second liquid outlet hole, and an inclined surface is reserved on the side of the locking compensation block close to the top ball.

[0006] A further arrangement is that a T-shaped groove is opened on the top inner wall of the second liquid outlet hole, and anti-slip wing plates are reserved on both sides of the locking and compensating block, and the locking and compensating block and the two anti-slip wing plates are slidably inserted in the T-shaped groove at the same time; a limit block is welded and fixed to the end of the T-shaped groove away from the liquid inlet end cover, and a self-locking screw hole is opened in the middle of the limit block, and a jacking bolt is screwed in the self-locking screw hole; through the provision of the T-shaped groove and the jacking bolt, not only the installation of the locking and compensating block can be made more convenient, but the compensation amplitude can also be controlled by controlling the advancement distance of the jacking bolt.

[0007] A further arrangement is that the main valve body, the liquid inlet end cover and the components inside thereof constitute a valve body module, and flanges are reserved at the ends of the main valve body and the liquid inlet end cover that are away from each other, at the openings of the liquid outlet hole 2 and the liquid inlet hole 1, and grooves are reserved on the opposite sides of the two flanges near the bottom ends; L-shaped mounting plates are fixed in the two grooves by bolts; this not only fixes the overall device after later installation to prevent the main valve body and the liquid inlet end cover from generating radial offset pulling force, but also ensures that the flange port surfaces are flush.

[0008] A further configuration is that a vertical arc groove is reserved on the side of the clamping rib plate close to the top ball, and the axis line of the arc groove is parallel to the axis line of the sliding rod; by setting the clamping rib plate with the arc groove, the top ball can be prevented from slipping when subjected to force, ensuring that it is always in the middle position of the top core of the hemispherical shell.

[0009] A further configuration is that the cross-section of the dense spring is rectangular, and a stud is sleeved on the top end of the dense spring, and a screw hole matched with the stud is reserved at the bottom end of the sliding rod; a rubber ring is sleeved on the circumferential outer wall of the sliding rod near the bottom end, and a cylindrical expansion hole matched with the outer diameter of the rubber ring is reserved on the circumferential inner wall of the main transmission pipe near the bottom end, and the inner wall of the cylindrical expansion hole is polished; by setting a dense spring with a rectangular cross-section, the axial pressure from the sliding rod can be transmitted with maximum efficiency, and the setting of the rubber ring can improve the sealing effect of the device.

[0010] Further settings are as follows. A stepped card slot is machined at one end of the circumferential inner wall of the first liquid inlet hole close to the second cavity, and a fitting sliding abutting tube is slidably clamped in the stepped card slot. A concave surface adapted to the spherical surface size of the hemispherical shell top core is reserved at the opening at one end of the fitting sliding abutting tube close to the main valve body. The stepped card slot includes two parallel and vertical circular flat surfaces. Multiple spring storage holes are symmetrically distributed around the center on the circular flat surface away from the hemispherical shell top core, and a first abutting spring is arranged in each spring storage hole. The same wear-resistant abutting ring is fixed at one end of multiple first abutting springs away from the hole bottom, and a flexible graphite ring is arranged between the wear-resistant abutting ring and the circumferential outer wall of the fitting sliding abutting tube. The inner diameter of the circumferential inner wall of the fitting sliding abutting tube is the same as the inner diameter of the first liquid inlet hole.

[0011] Further settings are as follows. A positioning sunk groove is opened on the inner wall of the first cavity of the main valve body directly below the sliding abutting rod, and an anti - detachment top shaft is slidably connected in the groove opening of the positioning sunk groove. A compression spring is fixed between the bottom end of the anti - detachment top shaft and the groove bottom. The axis of the anti - detachment top shaft coincides with the axis of the main transmission pipe. A limiting card hole adapted to the top diameter and shape of the anti - detachment top shaft is opened on the side of the spherical surface of the hemispherical shell top core away from the main transmission pipe, and the top end of the anti - detachment top shaft is rounded.

[0012] Further settings are as follows. The wall thickness of the first cavity is smaller than the wall thickness of the second cavity. A scraping strip installation groove is opened on the spherical inner wall of the first cavity close to the liquid inlet end cover, and an arc - shaped scraping strip is embedded in the scraping strip installation groove. The span between the upper and lower ends of the arc - shaped scraping strip is larger than the maximum opening diameter of the fitting sliding abutting tube. The arc - shaped scraping strip further scrapes the spherical surface of the hemispherical shell top core to remove stubbornly attached substances on its surface, reducing frictional loss. Ring grooves are opened on the vertical planes on the opposite sides of the main valve body and the liquid inlet end cover, and a common sealing ring is arranged between the two ring grooves when they are combined.

[0013] Further settings are as follows. Annular grooves are reserved on the circumferential inner walls of the journal tube close to the upper and lower ends, and mutually symmetric h - shaped sealing rings are clamped in the two annular grooves respectively. An annular sealing gasket support is reserved on the circumferential outer wall of the main transmission pipe close to the bottom end, and the cross - sectional shape of the annular sealing gasket support is adapted to the h - shaped sealing ring. An internal - thread tightening device is screwed on the circumferential outer wall of the main transmission pipe close to the top of the support platform. Through holes are opened at the bottom of the annular groove close to the top and penetrate through the annular groove below, and a second abutting spring and a T - shaped push rod fixed at both ends of the second abutting spring are slidably placed in each through hole.

[0014] Further settings are as follows. A bearing seat is fixed at the top end of the connecting rod, and a bearing is fixed in the middle of the bearing seat. The installation card seat is fixedly sleeved on the top end of the bearing seat. The outer cover module includes a C-shaped cover fixed near the rear side in the middle of the installation card seat, and an electric control positioning pin is fixed at the top end of the C-shaped cover. The end of the extension rod of the electric control positioning pin is fixed at the top end of the sliding abutting rod through a coupling. A front side guard plate is fixed in front of the C-shaped cover, and semi-cylindrical support plates are respectively reserved on both sides of the installation card seat. An outer cover one and an outer cover two are respectively sleeved and fixed on the two semi-cylindrical support plates. The driving mechanism includes a sector-shaped worm gear sleeved and fixed on the circumferential outer wall of the main transmission pipe near the top end. The central angle of the sector-shaped worm gear is between 90° and 110°. Mutually adapted shaft rod seats are respectively fixed on the two semi-cylindrical support plates of the installation card seat, and a long shaft rod and a short shaft one that are parallel and at the same height are respectively rotatably connected on the two shaft rod seats. A worm gear sleeve and a driving pulley are respectively fixed at both ends of the long shaft rod, and the worm gear sleeve meshes with the sector-shaped worm gear. A driven pulley is fixedly sleeved on the circumferential outer wall of the short shaft one, and the same toothed conveyor belt is wound between the circumferential outer walls of the driving pulley and the driven pulley. By controlling the horizontal reciprocating movement of one section of the toothed conveyor belt, the rotation of the sector-shaped worm gear can be realized, and then the rotation of the hemispherical shell top core can be driven. A piston air cylinder is fixed on the inner wall of the outer cover one. The piston air cylinder is a cylindrical structure with an internal cavity, and a piston push plate is slidably connected inside the piston air cylinder. A reciprocating push column extending out is fixed on the side of the piston push plate close to the toothed conveyor belt, and the end of the reciprocating push column is fixed on the upper surface of the toothed conveyor belt. An oil inlet pipe one and an oil inlet pipe two are respectively inserted at both ends of the piston air cylinder. By alternately squeezing high-pressure hydraulic oil through the provided oil inlet pipe one and oil inlet pipe two, the forward and backward movement of the reciprocating push column can be realized.

[0015] The beneficial effects in the present invention are as follows:

[0016] 1. By providing the top ball and the locking compensation block at the bottom end of the sliding abutting rod, when the valve is closed and the foreseeable pressure is about to increase, only need to control the sliding abutting rod to move downward to push the top ball downward. At this time, under the action of the inclined surface of the locking compensation abutting block, the abutting rib plate and the hemispherical shell top core can be tightly squeezed at the orifice of the liquid inlet hole one, thereby preventing the further expansion of the gap and resulting in fluid overflow.

[0017] 2. By providing the abutting spring one and the wear-resistant abutting ring, the fitting sliding pipe can be tightly attached to the spherical surface of the hemispherical shell top core. Even if there is slight wear or the fitting tightness changes due to thermal expansion and contraction, displacement compensation can be carried out in time to ensure the normal use of the valve.

[0018] 3. By providing the anti-disengagement top shaft, it can prevent the hemispherical shell top core from generating axial eccentricity when rotating or receiving unbalanced thrust from one side, thereby avoiding the phenomenon that the valve cannot be tightly closed when closing the valve.

[0019] 4. By means of the T-shaped push rods arranged at both ends of the second pressing spring, the two h-shaped sealing rings can be tightly pressed against the annular sealing gasket support and the lower surface of the internal thread tightening device, improving the sealing effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a side view of the present invention;

[0022] Figure 3 For the present invention Figure 2 It is a schematic diagram of the sectional structure along the line A-A in the present invention;

[0023] Figure 4 For the present invention Figure 3 It is a schematic diagram of the enlarged structure at B in the present invention;

[0024] Figure 5 It is a front view of the present invention;

[0025] Figure 6 For the present invention Figure 5 It is a schematic diagram of the sectional structure along the line C-C in the present invention;

[0026] Figure 7 It is a schematic diagram of the exploded structure of the outer cover module in the present invention;

[0027] Figure 8 It is a schematic diagram of the overall structure of the driving mechanism in the present invention;

[0028] Figure 9 It is a three-dimensional structure schematic diagram of the valve body in the present invention;

[0029] Figure 10 It is a three-dimensional sectional structure schematic diagram of the valve body in the present invention;

[0030] Figure 11 For the present invention Figure 10 It is a schematic diagram of the enlarged structure at K in the present invention;

[0031] Figure 12 It is a schematic diagram of the exploded structure of the sealing structure inside the liquid inlet end cover of the present invention;

[0032] Figure 13 It is a schematic diagram of the assembly structure of the locking compensation abutment block of the present invention.

[0033] In the figure: 1, main valve body; 101, positioning sunk groove; 102, T-shaped sliding groove; 103, squeegee mounting groove; 2, journal tube; 3, support platform; 4, internal thread tightening device; 5, mounting clamp seat; 501, C-shaped cover; 502, front side guard plate; 6, outer cover one; 7, connecting rod; 8, oil inlet pipe one; 9, electric control positioning pin; 901, sliding abutting rod; 902, dense spring; 903, top ball; 10, outer cover two; 11, embedding groove; 12, mounting plate; 13, liquid inlet end cover; 131, stepped clamping groove; 132, spring storage hole; 14, valve rod module; 141, hemispherical shell top core; 142, main transmission pipe; 143, annular gasket support; 144, abutting rib plate; 15, driving mechanism; 151, piston air cylinder; 152, oil inlet pipe two; 153, reciprocating top column; 154, sector worm gear; 155, shaft rod seat; 156, toothed conveyor belt; 157, driven pulley; 16, matching sliding abutting pipe; 17, ordinary sealing ring; 18, anti-disengagement top shaft; 19, locking compensation abutting block; 191, limit stop block; 20, flexible graphite ring; 21, abutting spring one; 22, wear-resistant abutting ring; 23, arc squeegee strip; 24, T-shaped push rod; 25, h-shaped sealing ring; 26, abutting spring two. Detailed implementation manners

[0034] 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.

[0035] In this embodiment, refer to Figures 1-13, a high-performance compensated shear valve, including a main valve body 1 with a cavity 1 inside. At the opening of the main valve body 1 near the cavity 1, a liquid inlet end cover 13 is fixed by bolts. On one side of the liquid inlet end cover 13 near the cavity 1, a cavity 2 is reserved. The cavity 1 and the cavity 2 form the same concentric spherical chamber, and the center of the spherical chamber is located in the main valve body 1. On the opposite sides of the main valve body 1 and the liquid inlet end cover 13, a liquid inlet hole 1 and a liquid outlet hole 2 that extend horizontally and pass through the center of the spherical chamber are reserved respectively; at the top of the outer wall of the main valve body 1, a shaft neck tube 2 that extends vertically upward is reserved, and at the top of the shaft neck tube 2, a platform 3 with an annular structure is reserved; at the top of the platform 3, a plurality of parallel connecting rods 7 are fixed, and at the top of the connecting rods 7, an installation seat 5 is arranged; on the upper surface of the installation seat 5, a driving mechanism 15 and an outer cover module are respectively arranged; a valve rod module 14 is arranged in the shaft neck tube 2, and the valve rod module 14 includes a main transmission tube 142 rotatably connected in the shaft neck tube 2. At the bottom of the main transmission tube 142, a hemispherical shell top core 141 in the shape of a 1 / 3 melon peel after vertical cutting with three knives is fixed; and on the inner arc side of the hemispherical shell top core 141, a pressing rib plate 144 extending towards the center of the sphere is fixed; inside the main transmission tube 142, a sliding pressing rod 901 is hermetically slidably connected, and at the bottom of the sliding pressing rod 901, a dense spring 902 is fixed, and at the bottom of the dense spring 902, a top ball 903 is fixed; on the inner wall of the cavity 1 near the liquid outlet hole 2, a locking compensation pressing block 19 extending towards the middle is fixed, and on one side of the locking compensation pressing block 19 near the top ball 903, an inclined surface is reserved; when the valve is closed, if the foreseeable pressure is to increase, only need to control the sliding pressing rod 901 to move downward to push the top ball 903 downward. At this time, under the action of the inclined surface of the locking compensation pressing block 19, the pressing rib plate 144 and the hemispherical shell top core 141 can be tightly pressed at the orifice of the liquid inlet hole 1, thereby preventing the further expansion of the gap from causing fluid overflow.

[0036] Refer to Figure 3 , Figure 9 and Figure 13 On the top inner wall of the liquid outlet hole 2, a T-shaped sliding groove 102 is opened, and on both sides of the locking compensation pressing block 19, anti-detachment wing plates are reserved. The locking compensation pressing block 19 and the two anti-detachment wing plates are simultaneously slidably inserted into the T-shaped sliding groove 102; at one end of the T-shaped sliding groove 102 far from the liquid inlet end cover 13, a limit stop block 191 is welded and fixed, and in the middle of the limit stop block 191, a self-locking screw hole is opened, and a top-in bolt is screwed in the self-locking screw hole; through the arranged T-shaped sliding groove 102 and the top-in bolt, not only the installation of the locking compensation pressing block 19 can be made more convenient, but also the compensation amplitude can be controlled by controlling the advancing distance of the top-in bolt.

[0037] Refer to Figures 1-3The main valve body 1, the liquid inlet end cover 13 and the components inside them constitute a valve body module, and flanges are reserved at the ends of the main valve body 1 and the liquid inlet end cover 13 that are away from each other, and the orifices of the liquid outlet hole 2 and the liquid inlet hole 1, and grooves 11 are reserved near the bottom ends on the opposite sides of the two flanges; L-shaped mounting plates 12 are fixed in the two grooves 11 by bolts; not only can it fix the overall device after later installation to prevent the main valve body 1 and the liquid inlet end cover 13 from generating radial offset tension, but it also ensures that the flange port surfaces are flush.

[0038] Reference Figure 8 and Figure 10 A vertical arc groove is reserved on the side of the clamping rib 144 close to the top ball 903, and the axis line of the arc groove is parallel to the axis line of the sliding rod 901; by setting the clamping rib 144 with an arc groove, the top ball 903 can be prevented from slipping when subjected to force, ensuring that it is always in the middle position of the top core 141 of the hemispherical shell.

[0039] In the present invention, the cross-section of the dense spring 902 is rectangular, and a stud is sleeved on the top end of the dense spring 902, and a screw hole matched with the stud is reserved at the bottom end of the sliding push rod 901; a rubber ring is sleeved on the circumferential outer wall of the sliding push rod 901 near the bottom end, and a cylindrical expansion hole matched with the outer diameter of the rubber ring is reserved near the bottom end of the circumferential inner wall of the main transmission tube 142, and the inner wall of the cylindrical expansion hole is polished; by setting the dense spring 902 with a rectangular cross-section, the axial pressure from the sliding push rod 901 can be transmitted with maximum efficiency, and the setting of the rubber ring can improve the sealing effect of the device.

[0040] Reference Figures 3-4 , Figure 12 A stepped groove 131 is machined on the circumferential inner wall of the liquid inlet hole 1 near one end of the cavity 2, and a matching sliding abutment tube 16 is slidably connected in the stepped groove 131, and a concave surface matching the spherical size of the hemispherical shell top core 141 is reserved at the opening of the matching sliding abutment tube 16 near one end of the main valve body 1; the stepped groove 131 includes two mutually parallel and vertical annular planes, and a plurality of spring slot holes 132 symmetrically distributed in the center are opened on the annular plane away from the hemispherical shell top core 141, and a tightening spring 21 is arranged in each of the spring slot holes 132; a plurality of tightening springs A wear-resistant butt ring 22 is fixed to the end of the spring 21 away from the bottom of the hole, and a flexible graphite ring 20 is arranged between the wear-resistant butt ring 22 and the circumferential outer wall of the matching sliding butt tube 16; the circumferential inner wall aperture of the matching sliding butt tube 16 is the same as the aperture of the liquid inlet hole 1; through the setting of the tightening spring 21 and the wear-resistant butt ring 22, the matching sliding butt tube 16 can be tightly attached to the spherical surface of the top core 141 of the hemispherical shell, and even if slight wear occurs or the tightness of the fit changes due to thermal expansion and contraction, displacement compensation can be performed in time to ensure the normal use of the valve.

[0041] Refer to Figure 3 and Figure 10 As shown in FIGS. and, a positioning sink 101 is formed in the inner wall of the first cavity of the main valve body 1 directly below the sliding abutting rod 901. An anti - detachment top shaft 18 is slidably connected in the slot of the positioning sink 101, and a compression spring is fixed between the bottom end of the anti - detachment top shaft 18 and the bottom of the slot. The axis of the anti - detachment top shaft 18 coincides with the axis of the main transmission pipe 142. A limiting and locking hole which is engaged with the top diameter and shape of the anti - detachment top shaft 18 is formed on the side of the spherical surface of the hemispherical shell top core 141 away from the main transmission pipe 142, and the top end of the anti - detachment top shaft 18 is rounded. By providing the anti - detachment top shaft 18, it can prevent the hemispherical shell top core 141 from generating axial eccentricity during rotation or when receiving unbalanced thrust from one side, thereby avoiding the phenomenon that the valve cannot be tightly closed when closing the valve.

[0042] Refer to Figure 3 、 Figure 6 、 Figure 13 As shown in FIGS.,, and, the wall thickness of the first cavity is smaller than that of the second cavity. A squeegee installation groove 103 is formed in the spherical inner wall of the first cavity near the liquid inlet end cover 13. An arc - shaped squeegee strip 23 is embedded in the squeegee installation groove 103. The upper and lower spans of the arc - shaped squeegee strip 23 are larger than the maximum opening diameter of the fitting sliding abutting pipe 16. The arc - shaped squeegee strip 23 performs supplementary scraping on the spherical surface of the hemispherical shell top core 141 to remove stubbornly attached substances on its surface, reducing frictional losses. Annular grooves 1 are formed on the vertical planes of the opposite sides of the main valve body 1 and the liquid inlet end cover 13, and a common sealing ring 17 is arranged between the two combined annular grooves 1.

[0043] Refer to Figures 10-2 As shown in FIG., annular grooves 2 are reserved near the upper and lower ends of the circumferential inner wall of the journal pipe 2, and mutually symmetrical h - shaped sealing rings 25 are respectively clamped in the two annular grooves 2. An annular sealing gasket support 143 is reserved near the bottom end of the circumferential outer wall of the main transmission pipe 142. The cross - sectional shape of the annular sealing gasket support 143 is adapted to that of the h - shaped sealing ring 25. An internally threaded tightener 4 is screwed on the circumferential outer wall of the main transmission pipe 142 near the top of the support 3. Through holes penetrating the lower annular groove 2 are formed at the bottom of the upper annular groove 2 near the top, and a pressing spring 26 and a T - shaped push rod 24 fixed at both ends thereof are slidably placed in each through hole. By the T - shaped push rods 24 arranged at both ends of the pressing spring 26, the two h - shaped sealing rings 25 can be tightly pressed against the lower surfaces of the annular sealing gasket support 143 and the internally threaded tightener 4, improving the sealing effect of the device.

[0044] Refer to Figure 3 、 Figure 5 、 Figures 7-8, a bearing seat is fixed at the top end of the connecting rod 7, and a bearing is fixed in the middle of the bearing seat. The mounting card seat 5 is fixedly sleeved on the top end of the bearing seat; the outer cover module includes a C-shaped card cover 501 fixed near the rear side in the middle of the mounting card seat 5, and an electric control positioning pin 9 is fixed at the top end of the C-shaped card cover 501. The end of the extension rod of the electric control positioning pin 9 is fixed at the top end of the sliding abutting rod 901 through a coupling; a front side guard plate 502 is fixed in front of the C-shaped card cover 501, and semi-cylindrical support plates are respectively reserved on both sides of the mounting card seat 5. An outer cover one 6 and an outer cover two 10 are respectively sleeved and fixed on the two semi-cylindrical support plates; the driving mechanism 15 includes a sector-shaped worm gear 154 sleeved and fixed on the circumferential outer wall of the main transmission pipe 142 near the top end, and the central angle of the sector-shaped worm gear 154 is between 90° and 110°; shaft rod seats 155 that are mutually adapted are respectively fixed on the two semi-cylindrical support plates of the mounting card seat 5, and a long shaft rod and a short shaft one that are parallel and at the same height are respectively rotatably connected on the two shaft rod seats 155. A worm gear sleeve and a driving pulley are respectively fixed at both ends of the long shaft rod, and the worm gear sleeve meshes with the sector-shaped worm gear 154; a driven pulley 157 is sleeved and fixed on the circumferential outer wall of the short shaft one, and the same toothed conveyor belt 156 is wound between the circumferential outer walls of the driving pulley and the driven pulley 157; by controlling the horizontal reciprocating movement of a section of the toothed conveyor belt 156, the rotation of the sector-shaped worm gear 154 can be realized, and then the rotation of the hemispherical shell top core 141 can be driven; a piston air cylinder 151 is fixed on the inner wall of the outer cover one 6. The piston air cylinder 151 is a cylindrical structure with an internal cavity, and a piston push plate is slidably connected inside the piston air cylinder 151. A reciprocating top column 153 extending out is fixed on one side of the piston push plate close to the toothed conveyor belt 156, and the end of the reciprocating top column 153 is fixed on the upper surface of the toothed conveyor belt 156; an oil inlet pipe one 8 and an oil inlet pipe two 152 are respectively inserted at both ends of the piston air cylinder 151; by alternately squeezing high-pressure hydraulic oil through the arranged oil inlet pipe one 8 and oil inlet pipe two 152, the forward and backward movement of the reciprocating top column 153 can be realized.

[0045] Working principle: When installing this device, first install the locking compensation abutting block 19 in place, then sleeve the h-shaped sealing ring 25 located below onto the main transmission pipe 142, and then insert the hemispherical shell top core 141 and the main transmission pipe 142 into the cavity one opening of the main valve body 1; finally, insert the T-shaped push rod 24 and the second abutting spring 26 into the corresponding through holes, and finally install the upper h-shaped sealing ring 25 and the internal thread tightening device 4 in place; then fix the liquid inlet end cover 13 installed with the fitting sliding abutting pipe 16 to the main valve body 1; finally, install the driving mechanism 15 and the outer cover module; finally, connect the two high-pressure oil pipes for driving to the interfaces of the first oil inlet pipe 8 and the second oil inlet pipe 152 respectively; when the valve is closed, if the foreseeable pressure is to increase, just control the electric control positioning pin 9 to start, so as to drive the sliding abutting rod 901 to move downward and then push the top ball 903 downward. At this time, under the action of the inclined surface of the locking compensation abutting block 19, the top ball 903 tightly presses the abutting rib plate 144 and the hemispherical shell top core 141 on the concave surface of the pipe orifice of the fitting sliding abutting pipe 16 at the orifice of the first liquid inlet hole, so as to prevent the further expansion of the gap and cause fluid overflow.

[0046] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A high-performance compensating shear valve, comprising a main valve body (1) having a cavity 1 therein, wherein a liquid inlet end cover (13) is fixed to the main valve body (1) near the opening of the cavity 1 by bolts, a cavity 2 is reserved on a side of the liquid inlet end cover (13) near the cavity 1, the cavity 1 and the cavity 2 are combined into a same concentric spherical chamber, and a liquid inlet hole 1 and a liquid outlet hole 2 are reserved on opposite sides of the main valve body (1) and the liquid inlet end cover (13); the characteristic is that: A shaft neck tube (2) extending vertically upward is reserved at the top of the outer wall of the main valve body (1), a valve stem module (14) is arranged in the shaft neck tube (2), and the valve stem module (14) comprises a main transmission tube (142) rotatably connected to the shaft neck tube (2), a hemispherical shell top core (141) with a melon-shaped structure is fixed at the bottom end of the main transmission tube (142); and a tightening rib plate (144) extending toward the center of the ball is fixed on the inner arc side of the hemispherical shell top core (141); the main transmission tube (142) is internally sealed and slidably connected with a sliding rod (901), and a compact spring (902) is fixed at the bottom end of the sliding rod (901), and a top ball (903) is fixed at the bottom end of the compact spring (902); a locking compensation block (19) extending toward the middle is fixed on the inner wall of the cavity one near the second liquid outlet hole, and an inclined surface is reserved on the side of the locking compensation block (19) near the top ball (903); The inner wall of the cavity 1 of the main valve body (1) is provided with a positioning recessed groove (101) directly below the sliding stop rod (901), and an anti-dropping top shaft (18) is slidably connected in the notch of the positioning recessed groove (101), and a compression spring is fixed between the bottom end of the anti-dropping top shaft (18) and the bottom of the groove; the axis of the anti-dropping top shaft (18) coincides with the axis of the main transmission tube (142), and a limiting hole that matches the diameter and shape of the top end of the anti-dropping top shaft (18) is provided on the side of the spherical surface of the hemispherical shell top core (141) away from the main transmission tube (142), and the top end of the anti-dropping top shaft (18) is rounded.

2. The high performance compensated shear valve according to claim 1, characterized in that: A T-shaped slide groove (102) is formed on the inner wall of the top of the second liquid outlet hole, and anti-slip wing plates are reserved on both sides of the locking compensation stopper (19), and the locking compensation stopper (19) and the two anti-slip wing plates are simultaneously slidably inserted into the T-shaped slide groove (102); a limit stopper (191) is welded and fixed to one end of the T-shaped slide groove (102) away from the liquid inlet end cover (13), and a self-locking screw hole is formed in the middle of the limit stopper (191), and a jacking bolt is screwed into the self-locking screw hole.

3. The high performance compensated shear valve according to claim 1, characterized in that: The main valve body (1), the liquid inlet end cover (13) and the components inside thereof constitute a valve body module, and flanges are reserved at the ends of the main valve body (1) and the liquid inlet end cover (13) that are away from each other and are located at the openings of the second liquid outlet hole and the first liquid inlet hole, and recesses (11) are reserved near the bottom ends of the two flanges on the opposite sides; L-shaped mounting plates (12) are fixed in the two recesses (11) by bolts.

4. The high performance compensated shear valve according to claim 1, characterized in that: A vertical arc groove is reserved on one side of the abutting rib plate (144) close to the top ball (903), and the axis of the arc groove is parallel to the axis of the sliding abutting rod (901).

5. The high performance compensated shear valve according to claim 1, characterized in that: The cross-section of the compact spring (902) is rectangular, and a stud is sleeved on the top end of the compact spring (902), and a screw hole matched with the stud is reserved at the bottom end of the sliding rod (901); a rubber ring is sleeved on the circumferential outer wall of the sliding rod (901) near the bottom end, and a cylindrical expansion hole matched with the outer diameter of the rubber ring is reserved on the circumferential inner wall of the main transmission tube (142) near the bottom end, and the inner wall of the cylindrical expansion hole is polished.

6. The high performance compensated shear valve according to claim 1, characterized in that: A stepped groove (131) is machined on one end of the circumferential inner wall of the liquid inlet hole 1 near the cavity 2, and a matching sliding abutment tube (16) is slidably engaged in the stepped groove (131), and a concave surface matching the spherical size of the hemispherical shell top core (141) is reserved at the opening of one end of the matching sliding abutment tube (16) near the main valve body (1); the stepped groove (131) includes two mutually parallel and vertical annular planes, and the annular plane away from the hemispherical shell top core (141) is A plurality of spring storage holes (132) are provided on the plane and are symmetrically distributed in the center. A clamping spring (21) is provided in each of the spring storage holes (132). The ends of the plurality of clamping springs (21) away from the bottom of the holes are fixed with a same wear-resistant retaining ring (22). A same flexible graphite ring (20) is provided between the wear-resistant retaining ring (22) and the circumferential outer wall of the matching sliding retaining tube (16). The circumferential inner wall of the matching sliding retaining tube (16) has the same aperture as the aperture of the liquid inlet hole (1).

7. The high performance compensated shear valve according to claim 1, characterized in that: The wall thickness of the cavity one is smaller than that of the cavity two, and a scraper strip installation groove (103) is formed on the spherical inner wall of the cavity one near the liquid inlet end cover (13), and an arc-shaped scraper strip (23) is embedded in the scraper strip installation groove (103). The upper and lower ends of the arc-shaped scraper strip (23) have a span greater than the maximum opening diameter of the matching sliding tube (16). The arc-shaped scraper strip (23) performs additional scraping on the spherical surface of the hemispherical shell top core (141). An annular groove one is formed on the vertical plane on the opposite side of the main valve body (1) and the liquid inlet end cover (13), and a common sealing ring (17) is provided between the two annular grooves one when they are combined.

8. The high performance compensated shear valve according to claim 1, characterized in that: A support platform (3) is reserved at the top of the journal tube (2); a plurality of mutually parallel connecting rods (7) are fixed at the top of the support platform (3), and a mounting base (5) is provided at the top of the connecting rod (7); a driving mechanism (15) and a cover module are respectively provided on the upper surface of the mounting base (5); two annular grooves are reserved near the upper and lower ends of the circumferential inner wall of the journal tube (2), and mutually symmetrical H-shaped sealing rings (25) are respectively clamped in the two annular grooves; the main transmission tube ( An annular sealing pad holder (143) is reserved near the bottom end of the circumferential outer wall of the main transmission tube (142), and the cross-sectional shape of the annular sealing pad holder (143) is compatible with the H-shaped sealing ring (25); an internal threaded tightener (4) is screwed to the top end of the circumferential outer wall of the main transmission tube (142) near the support platform (3); a through hole is opened at the bottom of the annular groove 2 near the top end, which penetrates the annular groove 2 below, and a tightening spring 2 (26) and a T-shaped push rod (24) fixed at both ends are slidably placed in the through hole.

9. The high performance compensated shear valve according to claim 8, characterized in that: A bearing seat is fixed at the top of the connecting rod (7), and a bearing is fixed in the middle of the bearing seat, and the mounting seat (5) is fixedly sleeved on the top of the bearing seat; the outer cover module comprises a C-shaped card cover (501) fixed in the middle of the mounting card cover (5) near the rear side, and an electric control positioning pin (9) is fixed at the top of the C-shaped card cover (501), and the end of the extension rod of the electric control positioning pin (9) is fixed to the top of the sliding rod (901) through a coupling; the front of the C-shaped card cover (501) is fixed There is a front side guard plate (502), and semi-cylindrical support plates are reserved on both sides of the mounting base (5), and the two semi-cylindrical support plates are respectively sleeved and fixed with an outer cover (6) and an outer cover (10); the driving mechanism (15) comprises a fan-shaped worm gear (154) sleeved and fixed on the outer wall of the main transmission tube (142) near the top, and the central angle of the fan-shaped worm gear (154) is between 90° and 110°; the two semi-cylindrical support plates of the mounting base (5) are respectively fixed with mutually matching A shaft seat (155), and the two shaft seats (155) are respectively rotatably connected with a long shaft and a short shaft one which are parallel to each other and have the same height, and the two ends of the long shaft are respectively fixed with a worm sleeve and a driving pulley, and the worm sleeve and the fan-shaped worm wheel (154) are meshed with each other; the circumferential outer wall of the short shaft one is sleeved and fixed with a driven pulley (157), and the same toothed conveyor belt (156) is wound between the circumferential outer walls of the driving pulley and the driven pulley (157); the inner wall of the outer cover one (6) A piston cylinder (151) is fixed thereto. The piston cylinder (151) is a cylindrical structure with a cavity therein as a whole. A piston push plate is slidably connected to the interior of the piston cylinder (151). A reciprocating push column (153) is fixed to the side of the piston push plate close to the toothed conveyor belt (156). The end of the reciprocating push column (153) is fixed to the upper surface of the toothed conveyor belt (156). Oil inlet pipe 1 (8) and oil inlet pipe 2 (152) are respectively plugged into the two ends of the piston cylinder (151).

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