High performance safety valve

Abstract

The application discloses a high-performance safety valve and relates to the valve field, which is used for solving the problems of slow, inharmonious and frequent jumping of the back seat reaction. The valve body is provided with a valve cavity, the valve cavity is provided with an outlet flange on one side, the inner wall of the valve cavity and at least the inner wall of the valve cavity top close to the guide sleeve are in a spherical or similar spherical shape, so as to form the rebound force of the swooping rebound disc by adjusting the flow direction of the partial medium self-swooping between the valve disc and the valve seat along the inner wall of the valve cavity, the outer periphery of the rebound disc is provided with a step, and the top surface of the step forms an impact plane for receiving the medium rebound force pressure. The medium is swooped out to the obliquely downward direction between the valve disc and the valve seat, due to the spherical inner wall shape of the valve cavity, the medium flows upward along the inner wall of the valve cavity, the medium swoops downward due to the spherical inner wall of the valve cavity top, and impacts the top surface of the rebound disc, the impact plane is impacted by the medium rebound force, the valve disc is rapidly back-seated and sealed, the back seat reaction is rapid and more stable, and the performance of the safety valve is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of valves, in particular to a high-performance safety valve. BACKGROUND

[0002] Safety valve is a kind of safety protection valve, its opening and closing part is under the action of external force in the closed state, when the medium pressure in the equipment or pipeline rises, exceeds the specified value, automatically open, through the discharge of medium to the system outside to prevent the medium pressure in the pipeline or equipment exceeds the specified value. Safety valve belongs to automatic valve, mainly used in boiler, pressure vessel and pipeline, control pressure does not exceed the specified value, the safety of the body and equipment operation plays an important protective role. Safety valve is an important safety accessory on the boiler, pressure vessel and other pressure equipment. Its reliability and performance are directly related to the safety of equipment and personal safety, and are closely related to energy saving and environmental protection.

[0003] The existing Chinese utility model patent: spring full opening safety valve (CN203309247U), including bonnet, valve cover, valve body, valve seat, valve flap, guide sleeve, backflushing disc and valve stem, is provided with adjusting ring on the valve seat, and backflushing disc is sleeved on the valve flap, backflushing disc is matched with adjusting ring, adjusting ring is used to accurately control the take-off parameter and backseat pressure of valve flap and backflushing disc, so that the valve reaches the ideal opening and closing pressure difference, and the safety valve can be quickly opened and backseated in time. However, in the process of use, we find that especially in the environment with large pressure difference or frequent pressure difference amplitude, when the valve flap is closed, the backseating is not smooth enough, the backseating reaction is delayed, the medium flows in the valve cavity, and the valve flap backseating is prone to frequent jumping, the backseating process shakes, which affects the performance of the safety valve. SUMMARY

[0004] The purpose of the present application: in order to overcome the defects of the prior art, the present application provides a high-performance safety valve, which solves the problems of slow, unsmooth and frequent backseating reaction.

[0005] The technical scheme of the present application: including valve body, valve flap, valve seat, backflushing disc, adjusting ring and guide sleeve, the valve seat is fixedly installed in the valve body, the adjusting ring is installed on the valve seat, the valve flap is installed in the backflushing disc, the guide sleeve is sleeved outside the backflushing disc to guide the lifting of the backflushing disc, the valve body has a valve cavity, one side of the valve cavity has an outlet flange, the inner wall of the valve cavity and at least the inner wall of the valve cavity top near the guide sleeve are spherical or similar spherical in shape, so as to adjust the flow direction of part of the medium from the valve flap and the valve seat along the inner wall of the valve cavity to form the backflushing force of the backflushing disc, the outer periphery of the backflushing disc is provided with a step, and the top surface of the step forms an impact plane for receiving the backflushing force of the medium.

[0006] The technical scheme is adopted, when the valve disc needs to be closed, the medium is discharged obliquely downward from between the valve disc and the valve seat, due to the shape of the inner wall of the valve cavity, the medium flows upward along the inner wall of the valve cavity, the medium plunges downward due to the fact that the top of the valve cavity is also spherical and gathers inward, and impacts the top surface of the backflushing disc, the impact plane is impacted by the backflushing force of the medium, the valve disc is quickly seated and sealed, therefore, the spherical shape of the valve cavity is fully utilized, the medium is guided to gather to form a downward backflushing force, the force acting on the backflushing disc is increased, the valve disc can be smoothly and easily seated, the seating reaction is rapid and more stable, and the performance of the safety valve is improved.

[0007] Further provided in the application is that the outer periphery of the disc opening of the backflushing disc is provided with an annular inclined surface, and the annular inclined surface is inclined downward from the radial direction of the backflushing disc.

[0008] The original straight opening of the disc opening of the backflushing disc is changed into the design of the annular inclined surface by adopting the further provided technical scheme, the direction of the medium discharge is guided, the impact force of the medium vertically downward is reduced, the frequent jumping during the seating of the valve disc is avoided, and the flow rate of the medium is effectively improved.

[0009] Further provided in the application is that a guide surface is formed at the bottom of the valve cavity, and the guide surface extends from the position close to the valve seat to the outlet flange.

[0010] The medium is prevented from gathering in the groove close to the periphery of the valve seat by adopting the further provided technical scheme, and the medium can smoothly adjust the flow direction along the inner wall of the valve cavity.

[0011] Further provided in the application is that the inner wall from the inner wall of the valve cavity to the outlet flange is formed in the shape of a duckbill, and the inner diameter of the duckbill shape along the axial direction of the valve seat is greater than the inner diameter perpendicular to the axial direction of the valve seat.

[0012] The inner wall from the inner wall of the valve cavity to the outlet flange is smoothly transitioned in the shape of a duckbill by adopting the further provided technical scheme, which is beneficial to the flow guiding of the medium, prevents the undirectional flow of the medium in the valve cavity, and avoids the influence of the flow medium on the seating of the valve disc.

[0013] Further provided in the application is that the valve disc and the valve seat are respectively provided with a valve disc sealing layer and a valve seat sealing layer, the valve disc sealing layer and the valve seat sealing layer are in contact with each other to form a sealing surface, and the height of the sealing surface is higher than the height of the center of the inner wall of the outlet flange.

[0014] The distance of the medium flushing the bottom of the valve cavity is prolonged, and the impact force of the medium is reduced by adopting the further provided technical scheme, which is helpful to the opening of the safety valve.

[0015] Further provided in the application is that the adjusting ring is externally connected to the outer periphery of the valve seat in a threaded manner, a downward recessed gathering groove is arranged between the outer edge of the valve seat sealing layer and the adjusting ring, and the depth of the gathering groove can be adjusted by the rising or lowering of the adjusting ring.

[0016] With the further setting, the medium is gathered in the gathering groove when the valve is opened, and the medium acting force is applied to the upper part of the gathering groove, the medium acting force can be adjusted by adjusting the depth of the gathering groove, and the performance adjustment of the adjusting ring on the opening and closing of the valve disc is realized.

[0017] The further setting of the present application is that the top of the adjusting ring extends outwardly with a ring boss, and the ring boss is in sliding fit with the outer wall of the valve seat and in abutting contact.

[0018] With the further setting, the adjusting ring and the valve seat are in threaded connection, and there is a certain amount of eccentricity, which is easy to cause the unbalanced impact force of the medium on the valve disc, the ring boss can guide the adjusting ring, effectively avoiding the eccentric deviation of the adjusting ring, and preventing the frequent jumping caused by the unbalanced impact force when the valve disc is closed.

[0019] The further setting of the present application is that the outer edge of the top of the adjusting ring is provided with a chamfer surface, and the chamfer surface is downwardly inclined.

[0020] With the further setting, the chamfer surface can guide the direction of the medium, and can also minimize the area of the top surface of the adjusting ring, which is beneficial to prevent the impact of the gathered backwash force on the closing of the valve disc.

[0021] The further setting of the present application is that a positioning steel ball is installed between the top of the valve disc and the backflush disc, and positioning grooves are arranged on the contact surfaces of the positioning steel ball, the valve disc and the backflush disc.

[0022] With the further setting, the positioning steel ball has a positioning effect, and the stability of the closing of the valve disc is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The figure is a structural schematic diagram of the embodiment of the present application;

[0024] Figure 2 The figure is a structural schematic diagram of the embodiment of the present application Figure 1 The figure is a partial enlarged view of A in the present application;

[0025] Figure 3 The figure is a schematic diagram of the flow direction of the medium when the valve disc is opened;

[0026] Among them, 1, valve body; 2, valve disc; 3, valve seat; 4, backflush disc; 5, adjusting ring; 6, guide sleeve; 11, valve cavity; 7, outlet flange; 41, step; 42, impact plane; 43, ring inclined surface; 12, guide surface; 21, valve disc sealing layer; 31, valve seat sealing layer; 32, gathering groove; 51, ring boss; 52, chamfer surface; 22, positioning steel ball. DETAILED DESCRIPTION

[0027] As Figures 1-3The high-performance safety valve comprises a valve body 1, a valve clack 2, a valve seat 3, a backflush disc 4, an adjusting ring 5, and a guide sleeve 6. The valve seat 3 is fixedly installed in the valve body 1, the adjusting ring 5 is installed on the valve seat 3, the valve clack 2 is installed in the backflush disc 4, and the guide sleeve 6 is sleeved on the outside of the backflush disc 4 to guide the lifting of the backflush disc 4. When the medium pressure in the valve seat 3 is relatively high, the medium will impact the valve clack 2, the valve clack 2 will be lifted to open the safety valve, and the medium can be discharged. The valve body 1 has a valve cavity 11, one side of the valve cavity 11 has an outlet flange 7, the inner wall of the valve cavity 11 and at least the inner wall near the top of the valve cavity 11 close to the guide sleeve 6 are in a spherical or similar spherical shape, a step 41 is arranged on the outer periphery of the backflush disc 4, and the top surface of the step 41 forms an impact plane 42 for receiving the medium backflush force. When the valve clack 2 needs to be closed and returned to the seat after being opened, the medium will flow out from the outlet flange 7, and another part of the medium will flow upward along the inner wall of the valve cavity 11 due to the guidance of the spherical inner wall shape of the valve cavity 11. The medium will gather near the guide sleeve 6 and dive downward due to the spherical top of the valve cavity 11, and the medium backflush force will directly impact the top surface of the backflush disc 4, i.e. the impact plane 42, so that the backflush disc 4 is forced to quickly drive the valve clack 2 to return to the seat and seal.

[0028] The disc opening of the conventional backflush disc 4 is designed in a straight shape, which will guide part of the medium to vertically downward, the medium is easy to flow in series, the valve clack 2 will jump frequently when returning to the seat, and is not suitable for the product. Therefore, a ring inclined surface 43 is arranged on the outer periphery of the disc opening of the backflush disc 4, the ring inclined surface 43 is inclined downward from the radial direction of the backflush disc 4, and the disc opening of the backflush disc 4 is in an expanded shape, which is used to guide the direction of most of the medium to be obliquely downward, and is helpful to form the flow direction of the medium along the inner wall of the valve cavity 11.

[0029] In the background art, a groove is arranged near the periphery of the valve seat 3 to gather the vertically downward medium, which does not conform to the design of the product. Therefore, a similar flat guiding surface 12 is formed at the bottom of the valve cavity 11, the guiding surface 12 extends from near the valve seat 3 to the outlet flange 7, and the medium can adjust its flow direction along the inner wall of the valve cavity 11 or flow to the outlet flange 7 along the guiding surface 12.

[0030] The inner wall of the valve cavity 11 to the inner wall of the outlet flange 7 is in a duckbill shape, the inner diameter of the duckbill shape along the axis direction of the valve seat 3 is greater than the inner diameter perpendicular to the axis direction of the valve seat 3, i.e. the inner diameter in the vertical direction is much greater than the inner diameter in the horizontal direction. This is helpful to guide the medium, prevent the medium from flowing in series in the valve cavity 11, and avoid the influence of the series flow medium on the return of the valve clack 2 to the seat.

[0031] The valve clack 2 and the valve seat 3 are respectively provided with a valve clack sealing layer 21 and a valve seat sealing layer 31, the valve clack sealing layer 21 and the valve seat sealing layer 31 are in contact with each other to form a sealing surface, the height of the sealing surface is higher than the height of the center of the inner wall of the outlet flange 7. In the conventional design, the height of the sealing surface is lower than the height of the center of the inner wall of the outlet flange 7, when the valve is opened, the distance of the medium flushing the bottom of the valve cavity 11 is close, and a large backwash force is generated, if the height of the sealing surface is higher than the height of the center of the inner wall of the outlet flange 7, the distance of the medium flushing the bottom of the valve cavity 11 is extended, which helps to reduce the backwash force of the medium when the safety valve is opened, and part of the medium can also flow directly into the outlet flange 7.

[0032] The adjusting ring 5 is rotatably connected to the outer periphery of the valve seat 3 through internal and external threads, a downward recessed accumulation groove 32 is formed between the outer edge of the valve seat sealing layer 31 and the adjusting ring 5, and the depth of the accumulation groove 32 can be adjusted by lifting or lowering the adjusting ring 5. When the valve clack 2 is opened, the medium will accumulate in the accumulation groove 32, and the medium acting force is applied to the upper part of the accumulation groove 32, when the adjusting ring 5 is lifted, the depth of the accumulation groove 32 is increased, and the medium acting force is increased, so that the adjusting ring 5 can adjust the opening and closing performance of the valve clack 2.

[0033] The top of the adjusting ring 5 extends inwardly to form a ring boss 51, the ring boss 51 is in clearance fit with the outer wall of the valve seat 3, so that the ring boss 51 can be in sliding fit on the outer wall of the valve seat 3, and can abut against the outer wall of the valve seat 3 when the adjusting ring 5 is eccentric to maintain the coaxiality of the adjusting ring 5 and the valve seat 3.

[0034] The outer edge of the top of the adjusting ring 5 is provided with a chamfer surface 52, the chamfer surface 52 is inclined downward, and the relative arrangement of the chamfer surface 52 and the ring inclined surface 43 can more accurately guide the direction of the medium outflow.

[0035] A positioning steel ball 22 is installed between the top of the valve clack 2 and the backflush disc 4, the contact surfaces of the positioning steel ball 22 and the valve clack 2 and the backflush disc 4 are respectively provided with positioning grooves, and the positioning grooves are located at the center positions of the valve clack 2 and the backflush disc 4. The positioning steel ball 22 is placed in the positioning groove, and the valve clack 2 can be accurately returned and will not produce excessive positioning deviation.

Claims

1. A high performance safety valve comprising a valve body, a valve disc, a valve seat, a rebound disc, a regulating ring and a guide sleeve, the valve seat is fixedly installed in the valve body, the regulating ring is installed on the valve seat, the valve disc is installed in the rebound disc, the guide sleeve is sleeved outside the rebound disc to guide the rebound disc to rise and fall, characterized in that: The valve body has a valve cavity, one side of the valve cavity has an outlet flange, the inner wall of the valve cavity and at least the inner wall of the valve cavity top near the guide sleeve are spherical or similar spherical in shape, for the partial medium to adjust the flow direction along the inner wall of the valve cavity to form the impact of the swooping back disc, the outer periphery of the swooping back disc is provided with a step, the top surface of the step forms an impact plane for receiving the impact pressure of the medium; the valve disc and the valve seat are respectively provided with a valve disc sealing layer and a valve seat sealing layer, the valve disc sealing layer and the valve seat sealing layer form a sealing surface by contacting each other, and the height of the sealing surface is higher than the height of the center of the inner wall of the outlet flange. ​ 2. The high performance safety valve of claim 1, wherein: The outer periphery of the disc opening of the swooping back disc is provided with an annular inclined surface, which is inclined downward from the radial direction of the swooping back disc.

3. The high performance safety valve according to claim 1 or 2, characterized in that: The bottom of the valve cavity forms a guide surface, which extends from the position close to the valve seat to the outlet flange.

4. The high performance safety valve according to claim 1 or 2, characterized in that: The inner wall of the valve cavity to the inner wall of the outlet flange forms a duckbill shape, and the inner diameter of the duckbill shape in the direction of the valve seat axis is greater than the inner diameter perpendicular to the direction of the valve seat axis.

5. The high performance safety valve of claim 1, wherein: The adjusting ring is externally threaded with the outer periphery of the valve seat, and a downward recessed accumulation groove is formed between the outer edge of the valve seat sealing layer and the adjusting ring. The depth of the accumulation groove can be adjusted by raising or lowering the adjusting ring.

6. The high performance safety valve of claim 1 or 2, wherein: The top of the adjusting ring extends inwardly with an annular boss, which is in sliding fit and abutting contact with the outer wall of the valve seat.

7. The high performance safety valve of claim 1 or 2, wherein: The top outer edge of the adjusting ring is provided with a chamfered surface, which is inclined downward.

8. The high performance safety valve of claim 1 or 2, wherein: A positioning steel ball is installed between the top of the valve disc and the swooping back disc, and positioning grooves are arranged on the contact surfaces of the valve disc and the swooping back disc.

Images