CN210716256U

CN210716256U - Through type pressure reducing short piece, sleeve and pressure reducing valve

Info

Publication number: CN210716256U
Application number: CN201920843757.5U
Authority: CN
Inventors: 冯岚
Original assignee: Etam Fluid Control Technology (shandong) Co Ltd
Current assignee: Etam Fluid Control Technology (shandong) Co Ltd
Priority date: 2019-06-05
Filing date: 2019-06-05
Publication date: 2020-06-09
Anticipated expiration: 2029-06-05

Abstract

The utility model relates to a through type depressurization valve, including a plurality of through type step-down short piece to and the step-down sleeve, wherein step-down sleeve interference embedding a plurality of step-down short piece. The through pressure reducing short piece and the sleeve form a very complicated labyrinth flow passage, and the pressure reducing effect is achieved through multiple processes and local losses when the process medium flows through the labyrinth flow passage. The pressure reducing sleeve can be placed inside the valve, and the process medium flows through the throttling short pieces from outside to inside so as to adjust the flow characteristics and the process parameters of the medium. The utility model discloses when accomplishing the step-down and adjusting the task, to the problem that internal labyrinth lamination formula sleeve design is complicated, the processing difficulty of the same kind, the cost is expensive, improved self technological structure. The design of maze runner has been optimized, make the utility model discloses processing is simple and convenient, does not need the equipment lathe of high accuracy, economical and practical.

Description

Through type pressure reducing short piece, sleeve and pressure reducing valve

Technical Field

The utility model relates to a fluid control valve equipment technical field specifically is a run-through type step-down short member, sleeve and step-down valve.

Background

In recent years, with the development of material science and technology and mechanical science and technology, the domestic valve industry is also advancing, and the product structure types of various valve enterprises are also in the future. However, the existing regulating valve in China is still lack in the aspect of safety, and the generation of the valve problem under the severe working condition mainly comes from the fact that medium with too high flow rate flows through the valve core. High flow rates of media through the valve trim are important reasons that make valve control problems more pronounced, and cavitation, high noise, and line chatter are typical phenomena where media velocity is not effectively controlled. Based on the rapid pressure reduction principle, the valve is developed and designed into a labyrinth pressure reduction structure, so that the problem of pressure and speed control can be effectively solved. The labyrinth valve can effectively control the generation of high fluid speed, thereby realizing cavitation resistance, flash evaporation resistance, low vibration and low noise, and more effectively controlling the pressure and flow rate of a system in the whole valve stroke. Labyrinth pressure-reducing regulating valves are widely used in systems under severe working condition regulation, such as thermal power plants, chemical industry and other high-pressure-reducing liquid, steam and gas emptying occasions. The labyrinth sleeve part commonly adopted by the existing labyrinth valve is formed by stitch welding of a plurality of circular ring discs with tortuous flow passages, the surfaces of which are processed by electric spark, and the existing labyrinth valve has high relative design difficulty and complex processing technology. At present, the regulating valve product used for special working conditions and high pressure difference in petrochemical enterprises is basically monopolized abroad. Domestic enterprises mainly copy and survey and drawing, products can only aim at the use working conditions of the copied products, and the use effect of the products can only be maintained temporarily. Foreign countries have strict technical blockages in China, and imported products such as spare parts are extremely expensive, so that equipment at the core of industries such as petroleum, chemical engineering, power generation and the like can only depend on import at present and is limited by foreign countries.

At present, the most common products for domestic and external use are labyrinth lamination type, similar products in China are basically imitated products, the type of pressure reduction piece is of a labyrinth structure, each lamination is subjected to labyrinth runner design, and the laminations are stacked layer by layer and then formed by vacuum fiber welding to form an integral pressure reduction cage. The pressure reduction effect is achieved by multiple path and local loss when the process medium passes through the labyrinth flow channel. The existing labyrinth laminated sleeve can be roughly divided into 3 types: turning labyrinth type, disk labyrinth type, reducing labyrinth type and different types of design modes have different theoretical bases, but all need large-scale accurate test devices, and the product processing equipment is very complex and basically special for machining. The main reason for limiting the domestic development is that the design is difficult, the processing is difficult, and the cost is high, so that the pressure reducing sleeve with reliable performance, small processing difficulty and reasonable design is urgently needed to replace an imported product in the market.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a run-through type step-down is short, sleeve and step-down valve to solve the problem that proposes among the above-mentioned background art.

A through-penetrating pressure relief stub, comprising: the body 1, a head end face 21, a tail end face 22 and a plurality of stepped holes 3; the head end surface 21 and the tail end surface 22 are positioned at two sides of the body 1 and are integrally formed with the body 1; the body 1 is cylindrical; the head end surface 21 and the tail end surface 22 are respectively and evenly distributed with four through holes 23; the stepped holes 3 are evenly and annularly distributed on four arc surfaces of the cylindrical body 1 and comprise ascending holes 31, slow-flow surfaces 32 and descending holes 33, the slow-flow surfaces 32 are circular grooves, the ascending holes 31 and the descending holes 33 are circular open holes, the radiuses of the ascending holes 31 and the descending holes 33 are the same, the ascending holes 31 and the descending holes are horizontally arranged on two sides of the circular grooves of the slow-flow surfaces 32 in parallel and are vertically intersected with the circular grooves of the slow-flow surfaces 32; the head end surface 21 is a plane and is provided with a head step hole 41, the head step hole 41 is 1/2 of the step hole 3, only comprises descending holes and a flow slowing surface 32 of 1/2 and is distributed on two sides of the plane; the tail end face 22 is a plane and is provided with a tail stepped hole 42, the tail stepped hole 42 is 1/2 of the stepped hole 3, only comprises the flow slowing faces 32 of the ascending holes 31 and 1/2 and is distributed on two sides of the plane; the opening directions of the slow flow surfaces 32 of the head end surface 21 and the tail end surface 22 are perpendicular to each other.

Further, the leading end face 21 and the trailing end face 22 have the same structure, and both can be inverted.

Further, the number of the stepped holes 3 is determined by the size of the pressure reducing valve and the size of the pressure.

Further, the number of the complete stepped holes 3 in the body 1 is optimally 2, and the complete stepped holes 3 and 1/2 stepped holes 3 on the head end face 21 or the tail end face 22 form a 1/4 cambered surface of the stepped holes 3 in an annular distribution.

Optionally, the 1/4 cambered surface stepped hole 3 distribution has ten steps of through depressurization.

The utility model also provides a through type decompression sleeve, which comprises a plurality of through type decompression short pieces and a sleeve body 5; a plurality of flow guide holes 52 are annularly distributed on the base body 51 of the sleeve body 5; the plurality of penetrating type pressure reduction short pieces are embedded into the sleeve body 5 in an interference mode.

Further, the guiding holes 52 are distributed in a ring shape and are arranged in rows, the position of the first hole in each row is different from that of the adjacent row by 1/n of radius, and n is an integer except 0.

Preferably, n is 1 or 2.

Further, the number of the through pressure reduction short pieces is determined by the pressure reduction requirement.

The utility model also provides an adopt above-mentioned through type step-down sleeve's depressurization valve, include: the through type decompression sleeve 1a, the valve seat 2a, the valve body 3a, the upper valve cover 4a, the flange 5a, the sealing gasket 6a, the stud bolt 17a, the washer 8a, the nut 19a, the packing press plate 10a, the packing press cover 11a, the packing 12a, the packing bottom pad 13a, the valve core 14a, the stud bolt 215a, and the nut 216 a; the valve seat 2a is placed in the valve body 3a, the penetrating type pressure reducing sleeve 1a is placed on the upper portion of the valve seat 2a, the valve core 14a is inserted into the penetrating type pressure reducing sleeve 1a, the upper valve cover 4a is installed, a bolt hole is formed in the upper valve cover 4a, the sealing gasket 6a is placed at the bolt hole, the flange plate 5a is placed on the sealing gasket 6a, and the sealing gasket is screwed and fixed through the stud 17a, the gasket 8a and the nut 19 a; the upper valve cover 4a further has a packing hole, the packing bottom pad 13a and the packing 12a are sequentially arranged, the packing 12a is pressed by the packing gland 11a, and the stud bolt 215a and the nut 216a are screwed and fixed.

Further, the depressurization flow direction is a right-side flow direction and a left-side flow direction.

Compared with the prior art, the utility model, have following advantage:

1. the utility model discloses can be applicable to various sealing system, including liquid and gas etc, this structural design is reasonable, processing is simple, can carry out the pertinence design to concrete operating mode, and application range is extensive, and the design innovation, through experiment and test, the import can already be replaced at present to run through formula step-down sleeve, becomes indispensable important subassembly in the high pressure difference valve.

2. Because the utility model discloses a realize the maze runner through drilling, consequently add man-hour and do not need the professional equipment lathe, avoided processing horizontal maze runner to the high requirement of machine tool, high accuracy.

3. A series of throttling short pieces are pressed into the sleeve in a small interference fit mode to form the pressure reducing sleeve. The through type pressure reducing short piece and the sleeve form a very complex pressure reducing flow channel, the through type pressure reducing is adopted in the high pressure difference working condition, and the pressure reducing effect is achieved through multiple times of path and local loss when a process medium flows through the labyrinth flow channel from outside to inside. The anti-cavitation device can effectively achieve the purposes of reducing noise and preventing cavitation damage, has strong anti-cavitation capability, is suitable for heavy load, is particularly suitable for controlling high-pressure-difference fluid, and can be used in severe working conditions. Meanwhile, the labyrinth flow passage is formed in a stepped hole staggered three-dimensional mode and is used for replacing a labyrinth lamination type middle horizontal labyrinth flow passage.

4. The process media are gathered and collided at the center of the cross stepped hole to counteract respective energy, so that a liquid buffer cushion is formed, the flow velocity is further reduced, and the scouring of the high-speed process media to the sleeve is reduced. The structure principle is that local pressure loss can be generated due to sudden expansion and contraction of the flow channel, flow velocity loss can be generated due to flow division and flow combination of the process medium, and the labyrinth flow channel which is transversely and longitudinally staggered increases the damping of the motion of the process medium, so that the functions of through connection and pressure reduction are achieved, the pressure reduction and the loss are evenly distributed at each stage, and the purpose of effectively controlling the flow characteristic and the process parameters is achieved.

5. The criss-cross runner ports with variable diameters form a labyrinth runner, and the labyrinth runner undergoes penetrating pressure reduction in sequence of cross stepped holes, counter bores and cross stepped holes. The process media are gathered and collided at the center of the cross stepped hole to counteract respective energy, so that a liquid buffer cushion is formed, the flow velocity is further reduced, and the scouring of the high-speed process media to the sleeve is reduced. The sudden expansion and contraction of the flow channel can generate local pressure loss, the flow splitting and converging of the process medium can generate flow velocity loss, and the labyrinth flow channels which are staggered transversely and longitudinally increase the damping of the motion of the process medium, so that the functions of through connection and pressure reduction are achieved, the pressure reduction and the loss are evenly distributed in each stage, and the aim of effectively controlling the flow characteristics and the process parameters is fulfilled. Further, the process medium flows from outside the pressure reducing sleeve to inside the pressure reducing sleeve through the plurality of throttling stubs. The technical scheme has the advantages that when the process medium flows from the outside of the pressure reducing sleeve to the inside of the pressure reducing sleeve, the throttling short piece cannot be flushed out of the inside of the sleeve, the diameter of the cross hole of the throttling short piece is sequentially increased, the industrial medium can generate volume change after flowing through the labyrinth flow passage and being reduced in pressure, the phenomenon can be effectively reduced after the diameter is increased, and flushing of the valve body and the valve internals is reduced. The pressure reduction effect can be adjusted by adjusting the number of throttling short pieces through which the process medium flows. The use number of the throttling short pieces can be adjusted through the opening degree or the position of the valve core, and the adjustment requirements under different valve opening degrees are met through the combined adjustment of the sleeve profiles.

In a word, through the utility model discloses a run-through type step-down short piece has effectively realized the run-through type step-down, stabilizes the effect of throttle to structural design is reasonable, and production condition is low, and it is convenient to change, has effectively practiced thrift manufacturing cost.

Drawings

FIG. 1 is a schematic view of the structure of the through type step-down short part of the present invention

FIG. 2 is a schematic view of the run-through type step-down short product of the present invention

FIG. 3 is a schematic view of the through type pressure reducing sleeve of the present invention

FIG. 4 is a schematic view of the pressure reducing valve of the present invention

Wherein, the part names corresponding to the reference numbers are as follows:

the body 1, a head end face 21, a tail end face 22, a stepped hole 3, the head end face 21, the tail end face 22 and a through hole 23; the pressure reducing valve comprises an ascending hole 31, a flow slowing surface 32, a descending hole 33, a first stepped hole 41, a tail stepped hole 42, a sleeve body 5, a seat body 51, a flow guiding hole 52, a penetrating type pressure reducing sleeve 1a, a valve seat 2a, a valve body 3a, an upper valve cover 4a, a flange plate 5a, a sealing gasket 6a, a stud bolt 17a, a gasket 8a, a nut 19a, a packing pressing plate 10a, a packing pressing cover 11a, packing 12a, a packing bottom gasket 13a, a valve core 14a, a stud bolt 215a and a nut 216a

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-2, a through-type pressure-reducing short piece comprises: the body 1, a head end face 21, a tail end face 22 and a plurality of stepped holes 3; the head end surface 21 and the tail end surface 22 are positioned at two sides of the body 1 and are integrally formed with the body 1; the body 1 is cylindrical; the head end surface 21 and the tail end surface 22 are respectively and evenly distributed with four through holes 23; the stepped holes 3 are evenly and annularly distributed on four arc surfaces of the cylindrical body 1 and comprise ascending holes 31, slow-flow surfaces 32 and descending holes 33, the slow-flow surfaces 32 are circular grooves, the ascending holes 31 and the descending holes 33 are circular open holes, the radiuses of the ascending holes 31 and the descending holes 33 are the same, the ascending holes 31 and the descending holes are horizontally arranged on two sides of the circular grooves of the slow-flow surfaces 32 in parallel and are vertically intersected with the circular grooves of the slow-flow surfaces 32; the head end surface 21 is a plane and is provided with a head step hole 41, the head step hole 41 is 1/2 of the step hole 3, only comprises a descending hole and a flow slowing surface 32 of 1/2 and is distributed on two sides of the plane; the tail end face 22 is a plane and is provided with a tail stepped hole 42, the tail stepped hole 42 is 1/2 of the stepped hole 3, only comprises the rising holes 31 and a slow flow face 32 of 1/2 and is distributed on two sides of the plane; the opening directions of the slow flow surfaces 32 of the head end surface 21 and the tail end surface 22 are perpendicular to each other.

Optionally, the 1/4 cambered surface stepped hole 3 distribution has ten steps of pressure reduction.

As shown in fig. 3, the present invention further provides a penetrating type pressure reducing sleeve, which comprises the plurality of penetrating type pressure reducing short pieces and a sleeve body 5; a plurality of flow guide holes 52 are annularly distributed on the base body 51 of the sleeve body 5; the plurality of penetrating type pressure reduction short pieces are embedded into the sleeve body 5 in an interference mode.

Preferably, n is 1 or 2.

As shown in fig. 4, the utility model also provides an adopt above-mentioned through type pressure reducing sleeve's depressurization valve, include: the through type decompression sleeve 1a, the valve seat 2a, the valve body 3a, the upper valve cover 4a, the flange 5a, the sealing gasket 6a, the stud bolt 17a, the washer 8a, the nut 19a, the packing press plate 10a, the packing press cover 11a, the packing 12a, the packing bottom pad 13a, the valve core 14a, the stud bolt 215a, and the nut 216 a; the valve seat 2a is placed in the valve body 3a, the penetrating type pressure reducing sleeve 1a is placed on the upper portion of the valve seat 2a, the valve core 14a is inserted into the penetrating type pressure reducing sleeve 1a, the upper valve cover 4a is installed, a bolt hole is formed in the upper valve cover 4a, the sealing gasket 6a is placed at the bolt hole, the flange plate 5a is placed on the sealing gasket 6a, and the sealing gasket is screwed and fixed through the stud 17a, the gasket 8a and the nut 19 a; the upper valve cover 4a further has a packing hole, the packing bottom pad 13a and the packing 12a are sequentially arranged, the packing 12a is pressed by the packing gland 11a, and the stud bolt 215a and the nut 216a are screwed and fixed.

Compared with the prior art, the utility model, have following advantage:

1. the utility model discloses can be applicable to various sealing system, including liquid and gas etc, this structural design is reasonable, processing is simple, can carry out the pertinence design to concrete operating mode, and application range is extensive, and the design innovation through this company's experiment and test, and run-through pressure reduction sleeve can replace the import at present, becomes indispensable important subassembly in the high pressure difference valve.

3. A series of throttling short pieces are pressed into the sleeve in a small interference fit mode to form the pressure reducing sleeve. The through type pressure reduction short piece and the sleeve form a very complex labyrinth flow passage, the through type pressure reduction is adopted in the high pressure difference working condition, and the pressure reduction effect is achieved through multiple times of path and local loss when a process medium flows through the labyrinth flow passage from outside to inside. The anti-cavitation device can effectively achieve the purposes of reducing noise and preventing cavitation damage, has strong anti-cavitation capability, is suitable for heavy load, is particularly suitable for controlling high-pressure-difference fluid, and can be used in severe working conditions. Meanwhile, the labyrinth flow passage is formed in a stepped hole staggered three-dimensional mode and is used for replacing a labyrinth lamination type middle horizontal labyrinth flow passage.

The utility model discloses an implementation method does: the utility model aims to solve the technical problem of background art and provide a can be applied to the high pressure differential operating mode, but simultaneous processing is simple and convenient, does not need the non-labyrinth lamination formula's of professional equipment lathe step-down sleeve.

The utility model provides an above-mentioned technical problem's technical scheme as follows: a through type pressure reducing sleeve comprises a throttling short piece and a sleeve. The throttling short piece is pressed into the sleeve through small interference fit to form the pressure reducing sleeve. The pressure reducing sleeve can be placed in the valve, the process medium flows through each throttling short piece from outside to inside, and the throttling short pieces and the sleeve are provided with adjusting profiles for adjusting the flow characteristics and the process parameters of the medium.

The specific use method comprises the following steps: a series of throttling short pieces are pressed into the sleeve in a small interference fit mode to form the pressure reducing sleeve. The short throttling piece and the sleeve form a very complicated labyrinth flow passage, the penetration type pressure reduction is adopted in the high pressure difference working condition, and the pressure reduction effect is achieved through multiple times of path and local loss when a process medium flows through the labyrinth flow passage from outside to inside. The anti-cavitation device can effectively achieve the purposes of reducing noise and preventing cavitation damage, has strong anti-cavitation capability, is suitable for heavy load, is particularly suitable for controlling high-pressure-difference fluid, and can be used in severe working conditions. Meanwhile, the labyrinth flow passage is formed in a stepped hole staggered three-dimensional mode and is used for replacing a labyrinth lamination type middle horizontal labyrinth flow passage. And a special equipment machine tool is not needed during processing, so that the high requirement and high consumption of the processing horizontal labyrinth flow passage on the machine tool are reduced.

The utility model discloses to labyrinth runner structure principle and flow path design for: as shown in fig. 1-4, a plurality of stepped holes are distributed in the short throttling element in a criss-cross manner, when a process medium flows from the outer side to the inner side, the process medium flows in from a small hole on the left side firstly to reduce the pressure for the first stage, then flows together from the stepped holes in the vertical direction, then flows through the stepped holes in the horizontal direction to flow separately, and finally reaches the first counter bore, the section undergoes 3-stage pressure reduction, then sequentially passes through the stepped holes in the cross-shaped, counter bores and cross-shaped stepped holes in sequence, and finally reaches the right side of the short throttling element, and undergoes 10-stage pressure reduction altogether. The process media are gathered and collided at the center of the cross stepped hole to counteract respective energy, so that a liquid buffer cushion is formed, the flow velocity is further reduced, and the scouring of the high-speed process media to the sleeve is reduced. The structure principle is that local pressure loss can be generated due to sudden expansion and contraction of the flow channel, flow velocity loss can be generated due to flow division and flow combination of the process medium, and the labyrinth flow channel which is transversely and longitudinally staggered increases the damping of the motion of the process medium, so that the functions of through connection and pressure reduction are achieved, the pressure reduction and the loss are evenly distributed at each stage, and the purpose of effectively controlling the flow characteristic and the process parameters is achieved. The calculation aspect is also analyzed and calculated according to the fluid dynamics typical formula according to the theory.

The utility model discloses the selection to the construction material is such: for the labyrinth sleeve of the utility model, the selection of materials is mainly concentrated on the sleeve, the throttling short piece and the valve core valve seat. The material is selected taking into account the coefficient of thermal expansion of the material and the manner of hardening or strength after heat treatment. This means that the thermal expansion coefficient of the pressure reducing sleeve should be larger than that of the valve core and the valve seat, and the valve core and the sleeve must have a hardness difference to prevent the valve core and the sleeve from seizing due to mutual friction caused by the same hardness during working, thereby prolonging the service life of the valve internal member. The choice of materials can be found in table 1: labyrinth sleeve and internals materials selection table 1: labyrinth sleeve and internal part material selection meter

The utility model discloses a calculation process is such: the user requires a through pressure reducing regulating valve with a linear flow characteristic curve and a Cv of 5.95, and firstly, the flow area of the valve pressure reducer is determined, the maximum flow Cv of 5.95 is satisfied, and 36 throttling short pieces are needed in total. According to the Jean-Charles de Borda theorem, the so-called on-way head loss caused by friction in straight pipes with equal diameters is proportional to the length of the straight pipe and inversely proportional to the diameter of the straight pipe, so that the so-called local head loss h of the straight pipe with sudden diameter change_fThe formula 1-1 is:

the following results were obtained:

in the formula: a. the₁Enlarging the cross-sectional area of the front duct by mm³；

A₂Enlarging the cross-sectional area of the rear duct by mm³；

v-average flow velocity of the fluid in the pipeline after expansion mm/s;

g-acceleration of gravity mm/s²；

Zeta-the coefficient of flow resistance at the velocity of the medium in the line after the diameter change.

The flow resistance coefficient zeta depends on the size, the structure, the shape and the like of a product, and each reducing part in the throttling short piece can be regarded as an element in the throttling short piece, so that the pressure loss of a single throttling short piece is equal to the sum of the pressure losses of the reducing parts, and the pressure loss of the whole pressure reducing sleeve is 36 times of that of the single throttling short piece. The coefficient of flow resistance ζ, which can be used as an important parameter for measuring the kinetic energy of the lost part of the medium, can be directly influenced by the ratio of the cross-sectional areas before and after the reducing, so that the cross-sectional area per step of the pressure reduction of a single throttling short piece is shown in the table of the cross-sectional area per step of table 2:

table 2: single table of cross-sectional areas per stage

According to the machine manual, the sudden expansion and sudden reduction of the flow resistance coefficient ζ are shown in table 3: the standard variable diameter flow resistance coefficient ζ table shows:

table 3: zeta meter for reducing standard flow resistance coefficient

The resistance coefficient of each stage of a single throttling short piece can be calculated through the tables 2 and 3, the whole flow resistance coefficient is further obtained, and the calculation result is shown in a table 4 throttling short piece flow resistance coefficient table:

table 4: flow resistance coefficient meter for throttling short piece

Can be more visual by observing the flow resistance coefficient zetaThe ability of the throttling short piece and the pressure reducing sleeve to regulate the process medium. Due to local head loss h_fThe pressure reducing capacity of the through type pressure reducing regulating valve with Cv of 5.95 is increased by about 242 times compared with the ordinary regulating valve without pressure reduction because of the multiple relation with the flow resistance coefficient zeta.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Furthermore, a plurality of throttle short pieces are annularly distributed in a stepped hole in the sleeve, and the throttle short pieces and the stepped hole are connected in an interference fit mode.

The beneficial effect of adopting above-mentioned further scheme is that both do not need other fastening measures because interference fit and have the through-hole buffering, also can make the product can not lead to because of washing out and drop in the use.

Furthermore, a plurality of rows of stepped holes are annularly distributed in the sleeve, and the sleeve profile is formed by arranging the number of the holes and the holes.

The beneficial effect of adopting above-mentioned further scheme is that both pass through the sleeve profile, constitute the sleeve profile that can adjust technology medium through the ladder hole of special arrangement and the flow hole of not uniform size. Different sleeve profiles can be designed according to different process requirements, and diversified adjustment requirements are met.

Furthermore, the upper part of the sleeve is provided with a through hole for balancing.

The beneficial effect of adopting above-mentioned further scheme is because the sleeve work is inside the valve body, and the process medium can flow to case upper portion cavity, forms pressure in the cavity and compresses tightly the case downwards, can promote the sealed effect of case and disk seat, can reduce actuating mechanism's output again.

Furthermore, a plurality of flow passage stepped holes with different diameters are distributed on the throttling short piece, and the throttling short piece molded surface is formed by the different diameters of the holes.

The labyrinth flow passage has the beneficial effects that the criss-cross flow passage ports with variable diameters form a labyrinth flow passage, and 10-level pressure reduction is performed in sequence according to the sequence of the cross stepped hole, the counter bore and the cross stepped hole. The process media are gathered and collided at the center of the cross stepped hole to counteract respective energy, so that a liquid buffer cushion is formed, the flow velocity is further reduced, and the scouring of the high-speed process media to the sleeve is reduced. The sudden expansion and contraction of the flow channel can generate local pressure loss, the flow splitting and converging of the process medium can generate flow velocity loss, and the labyrinth flow channels which are staggered transversely and longitudinally increase the damping of the motion of the process medium, so that the functions of through connection and pressure reduction are achieved, the pressure reduction and the loss are evenly distributed in each stage, and the aim of effectively controlling the flow characteristics and the process parameters is fulfilled.

Further, the process medium flows from outside the pressure reducing sleeve to inside the pressure reducing sleeve through the plurality of throttling stubs.

The technical scheme has the advantages that when the process medium flows from the outside of the pressure reducing sleeve to the inside of the pressure reducing sleeve, the throttling short piece cannot be flushed out of the inside of the sleeve, the diameter of the cross hole of the throttling short piece is sequentially increased, the industrial medium can generate volume change after flowing through the labyrinth flow passage and being reduced in pressure, the phenomenon can be effectively reduced after the diameter is increased, and flushing of the valve body and the valve internals is reduced.

Furthermore, the pressure reduction effect can be adjusted by adjusting the number of the throttling short pieces through which the process medium flows.

The beneficial effect who adopts above-mentioned further scheme is that can adjust the use quantity of throttle short-piece through case aperture or position, through sleeve profile combination regulation, satisfies the regulation requirement under the different valve apertures.

As shown in fig. 4, the pressure reducing sleeve valve according to the embodiment of the present invention puts the valve seat 3 into the valve body 1, and puts the throttling short piece 1 into the sleeve 2, and then puts on the upper portion of the valve seat 3. A valve core 15 is placed in the center of a sleeve 2, a valve cover 5 is covered, a sealing gasket 7 is installed, a flange plate 6 is covered, and a stud bolt 8, a gasket 9 and a nut 10 are installed and screwed down respectively. And firstly placing a packing bottom pad 14, then placing a packing 13 into the upper valve cover 5, covering a packing gland 12, finally placing a packing press plate 11, and sequentially installing and screwing a stud 8 and a nut 10. The above is the assembly process of a pressure reducing sleeve valve.

The process medium flows in from the right side and flows out from the left side sequentially through the sequence of the short throttling element, the sleeve, the valve core and the valve seat. When the valve is closed, a process medium can flow into a cavity at the lower part of the upper valve cover 5 through a balance hole at the upper part of the sleeve 2, the valve core 15 can be pressed in an auxiliary mode, the throttling short piece 1 and the sleeve 2 form a labyrinth flow channel, and molded surfaces of the throttling short piece 1 and the sleeve 2 can adjust flow characteristics and process parameters of the process medium.

With the opening of the valve, the positions of the valve cores 15 with different opening degrees influence the number of the used throttle short pieces 1, and due to the fact that the number of the throttle short pieces 1 is close to the adjusting capacity, a user can select proper adjusting parameters to use in an adjusting range through adjusting the opening degree of the valve.

As the flow channel in the short throttling element 1 is suddenly enlarged and reduced to generate local pressure loss under the working condition of high pressure difference, the flow velocity loss is generated by the flow division and confluence of the process medium, and the motion damping of the process medium is increased by the criss-cross labyrinth flow channels, the functions of through connection and pressure reduction are achieved, the pressure reduction and the loss are evenly distributed at each stage, and the aim of effectively controlling the flow characteristic and the process parameters is fulfilled.

Meanwhile, the throttling short piece and the sleeve are core parts, so that the design is accurate, the high hardness and the corrosion resistance are required, and the thermal expansion coefficient of the material and the hardening mode or the strength after heat treatment are considered when the material is selected. Therefore, the effect of nitriding and hardening treatment by using the martensitic stainless steel is ideal.

The utility model discloses because realize the maze runner through drilling, consequently add man-hour and do not need the professional equipment lathe, avoided processing horizontal maze runner to high requirement, the high consumption of machine tool.

This structural design is reasonable, processing is simple, can carry out the pertinence design to specific operating mode, and application range is extensive, and the design innovation passes through this company's experiment and test, runs through formula pressure reduction sleeve and can replace the import at present, becomes indispensable important subassembly in the high pressure difference valve.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. A through-going pressure relief stub, comprising: the novel ladder comprises a body (1), a head end face (21), a tail end face (22) and a plurality of stepped holes (3); the head end surface (21) and the tail end surface (22) are positioned at two sides of the body (1) and are integrally formed with the body (1); the body (1) is cylindrical; the head end surface (21) and the tail end surface (22) are respectively and evenly distributed with four through holes (23); the stepped holes (3) are evenly distributed on four arc surfaces of the cylindrical body (1) in an annular mode and comprise ascending holes (31), slow flow surfaces (32) and descending holes (33), the slow flow surfaces (32) are circular grooves, the ascending holes (31) and the descending holes (33) are circular open holes, the radiuses of the ascending holes (31) and the descending holes (33) are the same, the ascending holes (31) and the descending holes (33) are horizontally arranged on two sides of the circular grooves of the slow flow surfaces (32) in parallel, and the ascending holes (31) and the descending holes are vertically intersected with the circular grooves of the slow flow surfaces (32); the head end face (21) is a plane, a head step hole (41) is arranged at the position of the head end face, the head step hole (41) is 1/2 of the step hole (3), only comprises descending holes and flow slowing surfaces (32) of 1/2, and is distributed on two sides of the plane; the tail end face (22) is a plane and is provided with a tail stepped hole (42), the tail stepped hole (42) is 1/2 of the stepped hole (3), only comprises ascending holes (31) and a flow slowing face (32) of 1/2 and is distributed on two sides of the plane; the opening directions of the slow flow surfaces (32) of the head end surface (21) and the tail end surface (22) are mutually vertical.

2. A through-going pump-down element according to claim 1, wherein the leading (21) and trailing (22) faces are of the same construction and can be inverted.

3. A through-going pressure-reducing stub as claimed in claim 1, wherein the number of stepped bores (3) is determined by the pressure-reducing valve size and the pressure size.

4. The penetrating pressure relief short piece of claim 1, wherein the number of complete step holes (3) in the body (1) is preferably 2, and the step holes (3) and 1/2 step holes (3) of the head face (21) or the tail face (22) form 1/4 cambered surface and are distributed annularly.

5. The through depressurisation stub of claim 1, wherein the 1/4 cambered stepped hole (3) distribution has a ten step depressurisation.

6. A through pressure reducing sleeve, characterized in that it comprises several through pressure reducing stubs according to any of claims 1 to 5, and also a sleeve body (5); a plurality of flow guide holes (52) are annularly distributed on the base body (51) of the sleeve body (5); the plurality of penetrating type pressure reduction short pieces are embedded into the sleeve body (5) in an interference mode.

7. A pressure reducing sleeve according to claim 6, wherein the holes (52) are arranged in rows, the first holes in each row being located at a radius of 1/n from the adjacent row, n being an integer other than 0.

8. A pressure reducing sleeve according to claim 7, wherein n is 1 or 2.

9. A through depressurisation sleeve according to any one of claims 6-8, wherein the number of through depressurisation segments is determined by the depressurisation requirement.

10. A pressure reducing valve, comprising: the through pressure reducing sleeve (1a) according to any of claims 6 to 9, further comprising: the valve comprises a valve seat (2a), a valve body (3a), an upper valve cover (4a), a flange plate (5a), a sealing gasket (6a), a stud bolt 1(7a), a gasket (8a), a nut 1(9a), a packing pressing plate (10a), a packing pressing cover (11a), packing (12a), a packing bottom pad (13a), a valve core (14a), a stud bolt 2(15a) and a nut 2(16 a); the valve body (3a) is placed in the valve seat (2a), the through type pressure reducing sleeve (1a) is placed at the upper part of the valve seat (2a), the valve core (14a) is inserted into the through type pressure reducing sleeve (1a), the upper valve cover (4a) is installed, a bolt hole is formed in the upper valve cover (4a), the sealing gasket (6a) is placed at the bolt hole, the flange plate (5a) is placed on the sealing gasket (6a), and the sealing gasket is screwed and fixed through the stud bolt 1(7a), the gasket (8a) and the nut 1(9 a); the upper valve cover (4a) is also provided with a packing hole, the packing bottom pad (13a) and the packing (12a) are sequentially arranged, the packing gland (11a) compresses the packing (12a), and the stud bolt 2(15a) and the nut 2(16a) are screwed and fixed.