CN113090774A

CN113090774A - Axial flow type fixed cone valve

Info

Publication number: CN113090774A
Application number: CN202110519236.6A
Authority: CN
Inventors: 潘瑶琼; 张俊林; 徐勇; 李政宏
Original assignee: Shanghai Guanlong Valve Energy Saving Equipment Co Ltd
Current assignee: Shanghai Guanlong Valve Energy Saving Equipment Co Ltd
Priority date: 2021-05-12
Filing date: 2021-05-12
Publication date: 2021-07-09

Abstract

The invention relates to an axial flow type fixed conical valve, which comprises an inlet pipe, a middle valve body, a rear valve body and an outlet pipe which are sequentially connected from an inlet side to an outlet side, wherein a guide sleeve is arranged in the middle valve body in an interference fit manner, the rear valve body comprises an outer cavity cylinder, an inner cavity cylinder and a rib plate connected between the inner wall of the outer cavity cylinder and the outer wall of the inner cavity cylinder, a hemispherical valve seat is fixedly arranged at the inlet side of the inner cavity cylinder, the valve seat is matched with a sliding sleeve gate which is driven by an operation link mechanism to axially move in the guide sleeve to open and close to form a sealing pair, the sliding sleeve gate is of a double-layer sleeve structure and comprises the outer cylinder, the inner cylinder and the rib plate connecting the inner wall of the outer cylinder and the outer wall of the inner cylinder, and a finger-shaped conical ring for pressure compensation and flow guide is arranged at the outlet end of the outer cylinder, Strong garbage resistance, strong vibration resistance and the like.

Description

Axial flow type fixed cone valve

Technical Field

The invention relates to the field of design and manufacture of valves, in particular to an axial flow type fixed conical valve.

Background

At present, the fixed cone valve is widely used for various water conservancy systems and pipe network systems, is mainly used for flow regulation and pressure regulation in pipes or energy dissipation of tail end discharge, and the driving mode of the common fixed cone valve is a rocker arm slide block structure or a double-screw structure. The conical valve with the rocker arm sliding block structure has the advantages that the sliding block of the conical valve needs to be independently matched due to the consideration of machining or installation deviation, the interchangeability is poor, the inconvenience is brought to maintenance, and meanwhile, due to the fact that a gap exists between the sliding block and the sliding sleeve gate, the sliding sleeve gate is prone to deflection and is blocked during the action of the valve. The double-screw structure conical valve has the advantages that the problem of the former does not exist, the problem of poor synchronism is easily caused by double screws, threads are easily damaged by fine impurities, driving force is increased or the threads are clamped, meanwhile, the structure is provided by a valve body according to the stroke of the screws, so that the valve structure is long in length, large in installation space and high in cost, and in the process of valve operation of the existing fixed conical valve, particularly under the working condition of small opening degree, due to the fact that water flow between a sliding sleeve gate and a valve seat is reduced, the local flow rate is high, cavitation and cavitation are easily caused, and the service life of the valve is seriously influenced.

Except for the fixed cone valve, the piston valve is also adopted to regulate flow and pressure in the existing water conservancy system, the driving mode of the piston valve is a crank-link mechanism, so that the driving mode is stable, the structure is compact, but all driving parts of the piston valve are arranged in the inner cavity of the valve body, and the valve is required to be detached during maintenance, so that the maintenance is very inconvenient. And under the high pressure difference, the local velocity of flow of the piston valve is very fast, also produce cavitation easily, if install squirrel cage device on the piston valve, make the valve have good anti cavitation performance, but its anti rubbish performance is greatly reduced, the anterior segment must be equipped with the filter equipment, has improved the maintenance cost and the purchase cost of engineering.

Disclosure of Invention

The object of the present invention is to overcome the above-mentioned drawbacks of the prior art by providing an axial fixed cone valve.

The purpose of the invention can be realized by the following technical scheme:

the axial flow type fixed conical valve comprises an inlet pipe, a middle valve body, a rear valve body and an outlet pipe which are sequentially connected from an inlet side to an outlet side, wherein a guide sleeve is arranged in the middle valve body in an interference fit manner, the rear valve body is composed of an outer cavity cylinder, an inner cavity cylinder and a rib plate connected between the inner wall of the outer cavity cylinder and the outer wall of the inner cavity cylinder, a hemispherical valve seat is fixedly arranged at the inlet side of the inner cavity cylinder, the valve seat is matched with a sliding sleeve gate which is driven by an operation connecting rod mechanism to axially move in the guide sleeve to open and close to form a sealing pair, the sliding sleeve gate is of a double-layer sleeve structure and is composed of the outer cylinder, the inner cylinder and the rib plate connected with the inner wall of the outer cylinder and the outer wall of the inner cylinder.

The outer wall of the outer barrel is provided with a groove for arranging a sealing ring, the sealing ring and the guide sleeve form a sealing pair, the sealing ring is of a rubber or plastic annular structure, the cross section of the sealing ring is in a C shape with an opening facing the inlet side of the valve, and the sealing performance is increased when the water flow pressure at the inlet side is increased.

The finger-shaped conical ring is composed of a small cylindrical barrel and a flaring-shaped conical ring, wherein the small cylindrical barrel is integrally formed, the flaring-shaped conical ring is provided with a plurality of U-shaped grooves or small holes in the surface, the inner surface of the small cylindrical barrel is provided with threads for fixing the outlet end of the outer barrel, the conical ring is in a straight cone shape, and when the fixed conical valve is used for flow regulation in a pipe, the conical ring is in a circular arc cone shape.

The inner wall of the outer barrel is uniformly provided with a plurality of connecting rib plates with V-shaped sections along the circumferential direction, and a certain included angle is formed between the surface direction of each connecting rib plate and the water flow direction, so that the tightening force in the circumferential direction is generated when water flows through, and vibration is prevented.

The operating link mechanism comprises an operating mechanism arranged on a cylindrical boss on the outer side of the middle valve body through a support, and a valve shaft, a crank, a connecting rod and a push rod which are sequentially in transmission connection with the operating mechanism, wherein the head of the push rod sequentially penetrates through the inner cavity barrel, the valve seat, the sealing gasket and the inner barrel and then is fixed through threads and a sliding sleeve gate nut.

The valve shaft is a cylindrical rod piece, a pin groove or a spline groove is arranged in the middle and at one end of the valve shaft and is arranged in a shaft hole of the rear valve body and is in transmission fit connection with a crank, the crank is integrally arm-shaped, the upper part of the crank is a cylindrical barrel, the lower part of the crank is a flat body, the cylindrical barrel is provided with a valve shaft hole, the inner part of the cylindrical barrel is provided with a pin hole or a spline groove which is connected with the valve shaft, the lower part of the cylindrical barrel is provided with a pin hole or a spline groove which is connected with a connecting rod, the connecting rod is a flat plate piece, two ends of the connecting rod are provided with U-shaped grooves which are used for rotatably connecting the crank and a push rod, the push rod is a long rod piece, the right end part of the push rod is a flat U-shaped body and is connected with the U-shaped groove of the connecting rod, the middle part, and 2 small holes are arranged on the circumference, so that the installation is convenient to rotate and lock.

The sealing gasket is a round cake-shaped plastic part and is sleeved on the push rod through a middle square hole, and two end faces of the sealing gasket are respectively provided with a small semicircular sealing lug boss for forming sealing pairs with the inner cylinder of the sliding sleeve gate and the valve seat respectively.

The inlet pipe is arranged at the inlet end of the fixed cone valve, the two ends of the inlet pipe are provided with flange plates, the middle of the inlet pipe is a straight pipe or a reducing pipe, the inner diameter of the inlet pipe is not smaller than the inner diameter of the outlet, the inlet end of the middle valve body is connected with the inlet pipe through bolts, the inlet end of the middle valve body is a straight pipe, the end surface of the middle valve body is provided with a groove for limiting a guide sleeve, the outlet end of the middle valve body is a horn-shaped flaring body, the inner diameter of the outlet end of the middle valve body is larger than the inner diameter of the inlet end of the middle valve body, the two ends of the rear valve body are provided with the flange plates, the inlet end of the outlet pipe is connected with the rear valve body, the middle main body is a flaring body with a small inlet end and a large outlet;

when the fixed conical valve is used for flow adjustment in a pipe, the inlet end of the outlet pipe is a straight pipe, the outlet end of the outlet pipe is a reducing pipe, the inner diameter of the outlet end is equal to that of the inlet pipe, and a flow restraining plate does not need to be configured at the moment.

The outlet end of the outlet pipe is provided with a guide plate as an optional part, the guide plate is integrally in a circular thin plate form, a plurality of grooves are uniformly formed in the plane of the guide plate along the circumferential direction by taking the circle center as the center, each groove is divided into two communicated concave arc grooves through a short rib plate, two adjacent grooves are separated through a long rib plate, the short rib plate is only connected with the outer ring of the guide plate, and the long rib plate is respectively connected with the outer ring and the inner ring of the guide plate.

When the fixed conical valve is fully closed, a sealing surface at the rear end of the sliding sleeve gate outer cylinder is in contact with the outer edge part of the arc surface of the hemispherical valve seat to form a main sealing pair, and meanwhile, a semicircular sealing boss on the end surface of the sealing gasket is respectively in contact with the top of the arc surface of the valve seat and the sliding sleeve gate inner cylinder to form an auxiliary sealing pair under the pressure of the inner cylinder;

when the fixed conical valve is fully opened or fully closed, the connecting rod and the push rod are in a straight line, so that the torque output by the operating mechanism to the sliding sleeve gate is maximized, and the transmission efficiency of the final torque is ensured to be maximized.

Compared with the prior art, the invention has the following advantages:

firstly, driving and stabilizing: the valve of the invention abandons the rocker arm slide block and the screw rod structure of the existing conical valve, adopts the crank connecting rod mechanism consistent with the piston valve, and the sliding sleeve gate can not deflect during driving, so that the driving is more stable, and the driving efficiency is higher.

Secondly, the anti-cavitation capability is strong: the sliding sleeve gate outlet end is provided with a finger-shaped conical ring with a plurality of U-shaped grooves or small holes, so that external water or gas with higher pressure can be supplemented to the fluid necking part of the valve in time, and the cavitation phenomenon is reduced.

Thirdly, online maintenance can be performed: all driving parts of the valve are arranged at the outlet end of the valve, so that the valve can directly enter the interior of the valve for online maintenance through a manhole or an outlet pipe on a rear-end pipeline without disassembling the valve.

Fourthly, the garbage resistance is strong: the valve is designed to be a large opening, so that the valve cannot be blocked even if large garbage passes through the valve, and the valve has strong adaptability to working conditions.

Fifthly, the vibration resistance is strong: the valve is internally provided with a plurality of V-shaped rib plates, so that the tightening force in the circumferential direction is always generated when water flows pass through the valve, the vibration is prevented, and the finger-shaped conical ring, the beam plate of the outlet pipe and the guide plate also guide and restrict the water outlet flow state of the valve, so that the fluid in the valve is in a streamline state, the flow state mutation cannot be generated, and the vibration of the valve is further reduced.

Drawings

FIG. 1 is a cross-sectional view of the closed state of the present invention.

Fig. 2 is a top view of the present invention.

Fig. 3 shows another finger-shaped conical ring in the form of an opening.

Fig. 4 is a right side view of the present invention.

Fig. 5 is a sectional view of the valve of the present invention in a small opening state.

Fig. 6 is a flow diagram of the valve of the present invention in a fully open position.

Fig. 7 is a block diagram of the valve of the present invention when used to regulate flow in a pipe.

FIG. 8 is a left side view of the sliding sleeve gate.

Fig. 9 is a left side view of the rear valve body.

The notation in the figure is:

1. the valve comprises an inlet pipe, 2, a middle valve body, 3, a guide sleeve, 4, a sealing ring, 5, a rear valve body, 5-1, a rib plate, 5-2, a cylindrical boss, 6, a sliding sleeve gate, 6-1, an outer cylinder, 6-2, an inner cylinder, 6-3, a connecting rib plate, 7, a finger-shaped conical ring, 7-1, a U-shaped groove, 7-2, a small hole, 7-3, an arc cone, 8, a crank, 9, a valve shaft, 10, an outlet pipe, 10a, another type of outlet pipe, 10-1, a beam plate, 11, a guide plate, 11-1, a groove, 12, a connecting rod, 13, a push rod, 14, a valve seat, 15, a sealing gasket, 16, a sliding sleeve gate nut, 17, a support, 18, an operating mechanism, 19.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Examples

As shown in figure 1, the invention provides an axial flow type fixed cone valve, which comprises an inlet pipe 1, a middle valve body 2, a guide sleeve 3, a sealing ring 4, a rear valve body 5, a sliding sleeve gate 6, a finger-shaped cone ring 7, a crank 8, a valve shaft 9, an outlet pipe 10, a guide plate 11, a connecting rod 12, a push rod 13, a valve seat 14, a sealing gasket 15, a sliding sleeve gate nut 16, a bracket 17, an operating mechanism 18, a gland 19 and the like.

The inlet pipe 1 is arranged at the inlet end of the valve, the two ends of the inlet pipe are provided with flange plates, the middle of the inlet pipe is a straight pipe or a reducing pipe, and the inner diameter of the inlet pipe is generally not smaller than that of the outlet.

The inlet end of the middle valve body 2 is connected with the inlet end of the inlet pipe 1 through a bolt, the inlet end is a straight pipe, a groove used for limiting the guide sleeve 3 is arranged on the end face, the outlet end is a horn-shaped flaring body, and the inner diameter of the outlet end of the middle valve body 2 is larger than that of the inlet end.

The guide sleeve 3 is embedded into the groove of the middle valve body 2 through a boss, the straight tube part is in interference fit with the inner wall of the straight tube of the middle valve body 2, and the inner wall of the guide sleeve 3 and the sealing ring 4 on the outer surface of the sliding sleeve gate form a sealing pair.

The sealing ring 4 is an annular structure made of rubber or plastics, is nested in a groove on the outer surface of the sliding sleeve gate 6, has a C-shaped section with an opening facing to the inlet end, and can deform to form sealing when being subjected to water pressure.

The sliding sleeve gate 6 consists of an outer cylinder 6-1, an inner cylinder 6-2 and a connecting rib plate 6-3, and moves axially in the guide sleeve 3, a groove for fixing the sealing ring 4 is formed in the outer surface of the outer cylinder 6-1, a thread for fixing the finger-shaped conical ring 7 is arranged at the outlet end, a square groove and an internal control are arranged on the inner cylinder 6-2 and are matched and connected with the push rod 13 to prevent relative rotation, the cross section of the connecting rib plate 6-3 is V-shaped, and a certain included angle is formed between the side surface of the connecting rib plate and the water flow direction to enable the water flow to generate tightening force in the circumferential direction when passing through the sliding sleeve gate 6 and prevent vibration, as shown.

The finger-shaped conical ring 7 consists of a section of small cylindrical barrel and a conical ring which are integrally formed, the inner surface of the small cylindrical barrel is provided with threads for fixing the small cylindrical barrel to the end part of the sliding sleeve gate 6, the conical ring is generally in a straight conical shape, the surface is provided with a plurality of U-shaped grooves 7-1 or small holes 7-2, and the conical ring shape can also be made into a circular arc cone 7-3 when the valve is used for regulating flow in a pipe.

The rear valve body 5 is positioned in the middle of the valve, the two ends of the rear valve body are provided with flange plates, the inlet end is connected with the middle valve body 2, the outer cavity wall is a straight cylinder, the inner cavity wall is a concave cylinder, the inner cavity wall and the outer cavity wall are connected through rib plates 5-1, the cross section of each rib plate 5-1 is V-shaped, a certain included angle is formed between the side surface of each rib plate and the water flow direction so that water flow generates tightening force in the circumferential direction when passing through the rear valve body 5, the two sides of the outer cavity straight cylinder are respectively provided with cylindrical bosses 5-2, and the insides of the cylindrical bosses.

The crank 8 is arm-shaped as a whole, one end is a cylindrical barrel part, the other end is a flat part, a valve shaft hole is arranged on the cylindrical barrel part, a pin hole or a spline groove connected with the valve shaft 9 is arranged inside the cylindrical barrel part, and a pin hole connected with the connecting rod 12 is arranged on the flat part.

The valve shaft 9 is a cylindrical rod, and a pin slot or a spline slot is arranged in the middle of the rod and at one end of the rod, is installed in the valve shaft hole of the valve body, and is connected with the crank 8 in a matching way.

The connecting rod 12 is a flat plate, two ends of the connecting rod are provided with U-shaped grooves for connecting the crank 8 and the push rod 13 in a relatively rotating manner, the push rod 13 is a long rod, the right end of the push rod is a flat U-shaped body and is connected with the U-shaped grooves of the connecting rod 12, the middle of the push rod is a square body and is matched and connected with the square grooves of the sliding sleeve gate 6 and the valve seat 14 to prevent relative rotation of all parts, the left end of the push rod is a cylinder, and the tail end of the cylinder is provided with threads for connecting the sliding sleeve gate nut 16 to further.

The valve seat 14 is of a hemispherical structure, the outer arc surface of the sphere and the sliding sleeve gate 6 form a sealing pair, a square groove for penetrating the push rod 13 is formed in the middle of the valve seat, and a boss matched with the concave barrel in the rear valve body 5 is arranged on the right end face of the valve seat and fixed with the fixed concave barrel through a bolt.

The sealed working of plastics that fills up 15 for the cake shape, the outside is circular, and the centre is offered the square groove that is used for passing push rod 13, all sets up the little boss of semicircular seal on the face of both ends, forms sealed vice with sliding sleeve floodgate 6 and disk seat 14, and sliding sleeve floodgate nut 16 is semi-circular structure, and inside sets up the screw thread for locking the connection between push rod 13 and the sliding sleeve floodgate 6, and set up 2 apertures on the circumference, rotatory locking when being convenient for install.

The outlet pipe 10 is installed at the outlet end of the valve, and both ends of the outlet pipe are provided with flanges, the inlet end is connected with the outlet end of the rear valve body 5, the middle main body is a flaring body with a small inlet end and a large outlet end, the middle of the inner wall of the flaring body is provided with a flow restraining plate 10-1, and the flow restraining plate 10-1 is a necking plate with a large inlet end and a small outlet end and a splayed section and is used for restraining the outlet flow state; when the valve is used for flow adjustment in a pipe, the outlet pipe 10 adopts another form of outlet pipe 10a, the inlet end of the other form of outlet pipe 10a is a straight pipe, the outlet end is a reducing pipe, and the inner diameter of the outlet end is consistent with the inner diameter of the inlet pipe 1.

The guide plate 11 is an optional part, the whole guide plate is in a thin plate form, a plurality of grooves 11-1 are formed in the whole plane and are directly fixed on the outlet end face of the outlet pipe 10 through screws, the grooves 11-1 are concave arc grooves, rib plates in the arc grooves are only connected with the outer ring of the guide plate 11, and external rib plates are simultaneously connected with the outer ring and the inner ring of the guide plate 11.

The two ends of the support 17 are circular plates provided with through holes, one end of each circular plate is fixed on the cylindrical boss 5-2 of the rear valve body 5, the other end of each circular plate is connected with the operating mechanism 18, the two circular plates are connected through a plurality of rib plates with certain thickness, torsion is avoided, the operating mechanism 18 is mainly used for providing torque for valve action, a key groove is formed in the operating mechanism 18 and is connected with the valve shaft 8, the operating mechanism 18 is generally of a reduction gear box structure and can be operated manually or electrically, and a hydraulic cylinder or a pneumatic cylinder structure can be used.

The gland 19 is of a boss structure and is respectively connected with the cylindrical bosses 5-2 at two sides of the rear valve body 5 and used for compressing the packing seal ring between the valve shaft 9 and the rear valve body 5 to prevent the valve from leaking outside.

The working principle of the invention is as follows:

the invention adopts a crank connecting rod mechanism for driving, simultaneously utilizes the outflow mode of water flow contraction and diffusion for energy dissipation and pressure regulation, and utilizes the damaged local negative pressure to ensure the cavitation resistance of the valve.

The valve drives the valve shaft 9 to rotate through the operating mechanism 18, so that the crank 8 connected with the valve shaft 9 also synchronously rotates, then the connecting rod 12 finally drives the push rod 13 and the sliding sleeve gate 6 to axially move in the guide sleeve 3, the distance between the sliding sleeve gate 6 and the valve seat 14 is continuously changed while the sliding sleeve gate 6 axially moves, the outflow area of water flow is synchronously changed due to the change of the distance, the inherent flow resistance coefficient of the valve is changed, and the function of flow regulation and pressure regulation is achieved.

As shown in figure 1, when the valve is fully closed, the rear end sealing surface of the sliding sleeve gate 6 is contacted with the hemispherical valve seat arc surface to form a main sealing pair, meanwhile, under the compression of the sliding sleeve gate inner cylinder 6-2, the semicircular sealing boss on the end surface of the sealing gasket 15, the top surface of the valve seat 14 and the sliding sleeve gate 6 form an auxiliary sealing pair, the sealing ring 4 in the groove of the sliding sleeve gate outer cylinder 6-1 is C-shaped with an opening facing to the inlet end and forms a front sealing pair with the guide sleeve 3, and when the pressure is higher, the sealing performance is better.

As shown in fig. 1 and 6, when the valve is fully opened or fully closed, the connecting rod 12 and the push rod 13 are in a straight line, so that the torque output by the operating mechanism 18 to the sliding sleeve gate 6 is maximized at this time, and the transmission efficiency of the final torque is maximized.

As shown in fig. 5 and 6, when water enters the valve from the inlet pipe, the pressure P1 passes through the interior of the sliding sleeve gate 6, and the water generates a tightening force in the circumferential direction under the action of the V-shaped rib of the sliding sleeve gate 6, so that the sliding sleeve gate 6 and the push rod 13 are always in a tightened state and will not fall off due to vibration. After passing through the sliding sleeve gate 6, the water flow can generate different degrees of contracted flow according to the overflowing area formed by different opening degrees of the valve, wherein partial energy of the water flow is consumed due to the contraction, and the local flow rate is fastest and the pressure is minimum, so that the negative pressure P2 is possibly formed, but because the finger-shaped conical ring 7 is provided with a plurality of small holes 7-2 (shown in figure 4) or U-shaped grooves (shown in figure 1), the water flow at the position is partially separated from the outer cavity high-pressure water flow P3 (consistent with the downstream pressure), and the outer cavity high-pressure water flow P3 supplements the local low pressure point through the small holes 7-2 or the U-shaped grooves 7-1, so that the first stage of cavitation (generating the negative pressure) is weakened, and the second stage of cavitation (bubble breakage) is prevented from damaging the valve body. When the pressure is supplemented, a plurality of annular water flows are formed on the finger-shaped conical ring 7, so that the vibration possibly generated by the finger-shaped conical ring 7 under the high-flow-rate working condition can be effectively reduced. Under the pressure supplementing effect and the flow guiding effect of the finger-shaped conical ring 7, the water flow containing micro bubbles is diffused to the outlet pipe 10 at a certain angle, and the energy of the water flow is further weakened due to the diffusion effect of the water flow. When water flows through the flow restraining plate 11-1, the water flow is locally contracted again, energy is weakened again, when the water flows through the flow restraining plate 11 at the outlet of the valve, the concentrated water flow is divided into a plurality of water columns with gaps by the groove 11-1, the vibration generated by unbalanced water flow distribution can be effectively weakened by the uniformly distributed water columns, and finally, the external atmosphere at the outlet of the valve or static water in the energy dissipation pool enters the water columns through the gaps, so that air entrainment or water friction energy dissipation is performed, the energy of the water flow is further dispersed and weakened, and the purpose of energy dissipation is achieved.

As shown in fig. 7, when the flow regulating valve is used for regulating flow in a pipe, the outlet end of the valve is generally not provided with the guide plate 11, and the inner diameter of the outlet end of the outlet pipe 10 is consistent with the inner diameter of the inlet end of the inlet pipe 1, therefore, under the application working condition, because the outlet end is generally connected with the pipe, the finger-shaped conical ring 7 is generally in a conical arc shape (or other shapes with a function of restricting the flow state), when water flows pass through, the flow state is in an arc-shaped shrinkage after being diffused for a certain distance, the shape is consistent with the diameter-reducing shape of the outlet pipe, the smooth flow state curve can reduce the sudden change of the flow state, cavitation vibration is avoided, meanwhile, the water flow of the valve can.

Claims

1. An axial flow type fixed conical valve comprises an inlet pipe (1), a middle valve body (2), a rear valve body (5) and an outlet pipe (10) which are sequentially connected from an inlet side to an outlet side, and is characterized in that a guide sleeve (3) is arranged in the middle valve body (2) in an interference fit manner, the rear valve body (5) comprises an outer cavity cylinder, an inner cavity cylinder and a rib plate (5-1) connected between the inner wall of the outer cavity cylinder and the outer wall of the inner cavity cylinder, a hemispherical valve seat (14) is fixedly arranged at the inlet side of the inner cavity cylinder, the valve seat (14) is matched with a sliding sleeve gate (6) which is driven by an operation link mechanism to axially move in the guide sleeve (3) to open and close to form a sealing pair, the sliding sleeve gate (6) is of a double-layer sleeve structure and comprises an outer cylinder (6-1), an inner cylinder (6-2) and a rib plate connecting the inner wall of the outer cylinder (6-1, a finger-shaped conical ring (7) for pressure compensation and flow guide is arranged at the outlet end of the outer cylinder (6-1).

2. The axial-flow type fixed cone valve as claimed in claim 1, wherein the outer wall of the outer cylinder (6-1) is provided with a groove for arranging a sealing ring (4), the sealing ring (4) and the guide sleeve (3) form a sealing pair, the sealing ring (4) is of an annular structure of rubber or plastic, and the cross section of the annular structure is in a C shape with an opening facing to the inlet side of the valve, so that when the pressure of water flow on the inlet side is increased, the sealing performance is increased.

3. An axial flow type fixed cone valve according to claim 1, characterized in that the finger-shaped cone ring (7) is composed of a small cylindrical barrel and a flared cone ring, the surface of the flared cone ring is provided with a plurality of U-shaped grooves (7-1) or small holes (7-2), the inner surface of the small cylindrical barrel is provided with threads for fixing at the outlet end of the outer barrel (6-1), the cone ring is in a straight cone shape, and when the fixed cone valve is used for flow regulation in a pipe, the cone ring is in a circular cone shape.

4. The axial-flow type fixed conical valve according to claim 1, characterized in that a plurality of connecting rib plates (6-3) with V-shaped cross sections are uniformly arranged on the inner wall of the outer cylinder (6-1) along the circumferential direction, and a certain included angle is formed between the surface direction of each connecting rib plate (6-3) and the water flow direction, so that a circumferential tightening force is generated when water flows through, and vibration is prevented.

5. The axial flow type fixed cone valve as claimed in claim 1, wherein the operating link mechanism comprises an operating mechanism (18) mounted on a cylindrical boss (5-2) at the outer side of the middle valve body (2) through a bracket (17), and a valve shaft (9), a crank (8), a connecting rod (12) and a push rod (13) which are sequentially in transmission connection with the operating mechanism (18), wherein the head of the push rod (13) sequentially penetrates through the inner cavity cylinder, the valve seat (14), the sealing gasket (15) and the inner cylinder (6-2) and then is fixed through a thread and a sliding sleeve gate nut (16).

6. The axial flow type fixed cone valve as claimed in claim 5, wherein the valve shaft (9) is a cylindrical rod, a pin slot or a spline slot is provided in the middle and one end of the valve shaft (9), and is installed in the shaft hole of the rear valve body (5) and is connected with the crank (8) in a transmission fit manner, the crank (8) is integrally in an arm shape, the upper portion is a cylindrical barrel, the lower portion is a flat body, the cylindrical barrel is provided with a valve shaft hole, a pin hole or a spline slot connected with the valve shaft (9) is provided in the cylindrical barrel, a pin hole connected with the connecting rod (12) is provided in the lower portion, the connecting rod (12) is a flat plate, and is provided with a U-shaped slot at both ends for rotatably connecting the crank (8) and the push rod (13), the push rod (13) is a long rod, the right end portion is a flat U-shaped body and is connected with the U-shaped slot of the connecting rod (, the sliding sleeve gate is matched and connected with a square groove in the sliding sleeve gate inner cylinder (6-2) and the valve seat (14) to prevent relative rotation, the left end part is a cylinder with a thread at the tail end and is used for connecting a sliding sleeve gate nut (16), the sliding sleeve gate nut (16) is of a semicircular structure, and 2 small holes are formed in the circumference to facilitate rotation and locking during installation.

7. The axial-flow type fixed cone valve as claimed in claim 5, wherein the sealing gasket (15) is a round cake-shaped plastic member, and is sleeved on the push rod (13) through a middle square hole, and two end faces of the sealing gasket are respectively provided with a small semicircular sealing lug boss for forming a sealing pair with the sliding sleeve gate inner cylinder (6-2) and the valve seat (14).

8. The axial-flow type fixed cone valve as claimed in claim 1, wherein the inlet pipe (1) is installed at the inlet end of the fixed cone valve, flanges are arranged at two ends of the inlet pipe, the middle of the inlet pipe is a straight pipe or a diameter reducing pipe, the inner diameter of the inlet pipe (1) is not smaller than the inner diameter of the outlet, the inlet end of the middle valve body (2) is connected with the inlet pipe (1) through bolts, the inlet end of the middle valve body is a straight pipe, a groove for limiting the guide sleeve (3) is arranged on the end surface of the inlet pipe, the outlet end of the inlet pipe is a trumpet-shaped flaring body, the inner diameter of the outlet end of the middle valve body (2) is larger than the inner diameter of the inlet end, the flanges are arranged at two ends of the rear valve body (5), the inlet end of the outlet pipe (10) is installed at the outlet end of the fixed cone valve, flanges are, a flow restraining plate (10-1) is arranged in the middle of the flaring body, and a splayed flaring plate with a large inlet end and a small outlet end is arranged at the inlet end of the flow restraining plate (10-1) and is used for restraining the flow state of the effluent;

when the fixed cone valve is used for flow adjustment in a pipe, the inlet end of the outlet pipe (10) is a straight pipe, the outlet end of the outlet pipe is a reducing pipe, and the inner diameter of the outlet end is equal to that of the inlet pipe, so that the flow restraining plate (10-1) is not required to be configured.

9. The axial-flow type fixed cone valve according to claim 1, wherein the outlet end of the outlet pipe (10) is provided with a guide plate (11) as an optional part, the guide plate (11) is integrally in a circular thin plate form, a plurality of grooves are uniformly formed on the plane of the guide plate (11) along the circumferential direction by taking the circle center as the center, each groove is divided into two communicated concave arc grooves by a short rib plate, two adjacent grooves are separated by a long rib plate, the short rib plate is only connected with the outer ring of the guide plate, and the long rib plate is respectively connected with the outer ring and the inner ring of the guide plate.

10. The axial-flow type fixed cone valve as claimed in claim 6, wherein when the fixed cone valve is fully closed, the sealing surface at the rear end of the sliding sleeve gate outer cylinder (6-1) is contacted with the outer edge part of the arc surface of the hemispherical valve seat (14) to form a main sealing pair, and simultaneously, the semicircular sealing bosses on the end surface of the sealing gasket (15) form auxiliary sealing pairs with the top of the arc surface of the valve seat (14) and the sliding sleeve gate inner cylinder (6-2) respectively under the pressure of the inner cylinder (6-2);

when the fixed cone valve is fully opened or fully closed, the connecting rod (12) and the push rod (13) form a straight line, so that the moment output by the operating mechanism (18) to the sliding sleeve brake (3) is maximized, and the maximum transmission efficiency of the final torque is ensured.