CN112709846B

CN112709846B - Multi-stage flux control valve, gas circuit system and valve structure

Info

Publication number: CN112709846B
Application number: CN201911022757.XA
Authority: CN
Inventors: 陈兴隆; 张成明; 林海波; 邵立新; 杨永智
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2022-10-04
Anticipated expiration: 2039-10-25
Also published as: CN112709846A

Abstract

The invention provides a multistage flux control valve, a gas path system and a valve structure, wherein the multistage flux control valve comprises an outer valve body which is provided with a main channel; the multi-stage valve core is arranged in the main channel, and a plurality of valve structures are arranged in the multi-stage valve core in parallel; the valve structure comprises a valve body, a valve column and a valve column spring, wherein the valve body is provided with a fluid channel communicated with the main channel; the valve column is movably connected in the fluid channel, and the valve column spring is connected with the valve column, so that the valve column has the tendency of moving to be matched with the first matching structure on the valve body to close the fluid channel; each valve structure is provided with a first opening pressure, and the valve column can be separated from the first matching structure under the action of the first opening pressure so as to communicate two ends of the fluid channel; the plurality of valve structures includes a plurality of stages of first cracking pressures. The invention solves the technical problem that the air pressure is difficult to keep stable when the pressure at the inlet end of the air path is increased under the condition that the flow of the air path is larger in the constant-pressure control valve in the prior art.

Description

Multi-stage flux control valve, gas circuit system and valve structure

Technical Field

The invention relates to the technical field of gas path control valves, in particular to a multi-stage flux control valve, a gas path system and a valve structure.

Background

The gas injection oil displacement technology is the dominant technology in the later stage of water injection development and low permeability reservoir development; in the gas injection oil displacement process, the connection and disconnection of a gas passage need to be controlled, and the method adopted for controlling the gas passage is basically the same as that adopted for controlling a liquid passage. The constant pressure control valve is usually spring-type, and the constant pressure value is determined by adjusting the telescopic distance of the spring. The spring supports the valve column, when the fluid is higher than the pressure, the valve plate is partially opened, the fluid flows out through the control valve, the pressure difference between the fluid pressure and the spring pressure is kept stable, and the constant pressure control of the flow is realized. In the practical application process, under the condition that the flow of the gas circuit is large, when the pressure at the inlet end of the gas circuit is increased, the pressure of the gas circuit is difficult to keep stable.

Disclosure of Invention

The invention aims to provide a multistage flux control valve, a gas circuit system and a valve structure, which are used for solving the technical problem that the air pressure is difficult to keep stable when the pressure at the inlet end of a gas circuit is increased under the condition that the flow of the gas circuit of a constant-pressure control valve in the prior art is larger.

The above object of the present invention can be achieved by the following technical solutions:

the present invention provides a multistage flux control valve comprising: an outer valve body provided with a main passage; the multi-stage valve core is arranged in the main channel, and a plurality of valve structures are arranged in the multi-stage valve core in parallel; the valve structure comprises a valve body, a valve column and a valve column spring, the valve body is provided with a fluid channel, and two ends of the fluid channel are communicated with the main channel; the valve rod is movably connected in the fluid channel, a first matching structure matched with the valve rod is arranged on the inner wall of the valve body, and the valve rod spring is connected with the valve rod, so that the valve rod has the tendency of moving to be matched with the first matching structure to close the fluid channel; each valve structure is provided with a first opening pressure, and the valve column can be separated from the first matching structure under the action of the first opening pressure so as to enable two ends of the fluid channel to be communicated; a plurality of said valve structures comprise a plurality of stages of said first cracking pressure.

In a preferred embodiment, the multistage valve core is provided with a plurality of single grooves, and the valve structure is installed in the single grooves.

In a preferred embodiment, a first external-aperture-structure cylinder is fixedly arranged in the main channel, and the first external-aperture-structure cylinder is located on one side of the first matching structure, which is far away from the valve column.

In a preferred embodiment, a second external pore structure cylinder is connected to the multistage valve core, and the second external pore structure cylinder is located on one side of the first matching structure far away from the valve cylinder.

In a preferred embodiment, a sieve tube is arranged at the end part of the multistage valve core, each fluid passage is communicated with the sieve tube, and sieve holes communicated with the main passage are arranged on the side wall of the sieve tube; the second outer pore structure cylinder is arranged in the sieve tube.

In a preferred embodiment, the multi-stage flux control valve comprises a main spring; the multistage valve core is movably connected with the main channel, a second matching structure matched with the multistage valve core is arranged on the inner wall of the outer valve body, and the main spring is connected with the multistage valve core, so that the multistage valve core has a tendency of moving to be connected with the second matching structure to seal the main channel; the multistage flux control valve has a second opening pressure, and the multistage valve core can be separated from the second matching structure under the action of the second opening pressure, so that two ends of the main channel are communicated; the second cracking pressure is greater than the first cracking pressure.

In a preferred embodiment, the main channel comprises a first main channel section, a second main channel section and a third main channel section which are sequentially communicated, and the second main channel section is columnar; the multistage valve core is arranged at the joint of the first main channel section and the second main channel section, the first main channel section is connected to the end part of the second main channel section, and the third main channel section is connected to the side wall of the first main channel section.

In a preferred embodiment, the valve stem is provided with an annular projection, and the first engagement structure comprises an annular groove that engages with the annular projection, the annular projection being capable of extending into the annular groove.

In a preferred embodiment, an end surface of the spool is provided with a groove, and the annular projection is formed at an edge portion of the groove.

In a preferred embodiment, the inner wall of the recess comprises a spherical cap surface portion.

In a preferred embodiment, a bottom of the annular groove is provided with a seal ring, and the annular protrusion is capable of abutting against the seal ring.

In a preferred embodiment, the inner wall of the annular groove near its axis is provided with a projection.

In a preferred embodiment, the surface of the annular projection is provided with a metal coating and/or the surface of the annular groove is provided with a metal coating.

In a preferred embodiment, the fluid passage is cylindrical, and the valve rod is movable in an axial direction of the fluid passage; the valve body comprises a sealing pipe fixed in the fluid channel, and the first matching structure is arranged at the end part of the sealing pipe.

In a preferred embodiment, a pore structure cylinder is arranged in the fluid channel, and the pore structure cylinder is positioned on the side of the first matching structure far away from the valve column.

In a preferred embodiment, the pore structure column has a void permeability greater than or equal to 2 darcy.

The invention provides a gas path system, comprising: the gas pipe, the gas source control device, the safety valve, the constant pressure valve and the multi-stage flux control valve; the gas source control device is connected with the gas pipe, the safety valve and the constant pressure valve are connected in parallel with the gas pipe, and the multistage flux control valve is connected in series with the gas pipe.

The invention provides a valve structure applied to the multistage flux control valve, which comprises: a valve body provided with a fluid passage; a spool movably connected in the fluid passage; the inner wall of the valve body is provided with a first matching structure matched with the valve column, and the valve column can move relative to the valve body to abut against the first matching structure so as to seal the fluid channel; and a pore structure cylinder is arranged in the fluid channel and is positioned on one side of the first matching structure, which is far away from the valve column.

In a preferred embodiment, the pore structure cylinder has a percolation resistance of less than or equal to 0.01MPa.

In a preferred embodiment, the pore structure cylinders have a pore size greater than or equal to 10 μm.

In a preferred embodiment, the pore structure cylinder is made by sintering corrosion-resistant metal powder.

In a preferred embodiment, the corrosion-resistant metal powder comprises titanium or a titanium alloy.

The invention has the characteristics and advantages that: each valve structure in this multistage flux control valve can realize opening automatically along with the change of pressure in the main entrance, makes the gas circuit can keep invariable at a plurality of pressure levels, realizes the multistage regulation to gas circuit pressure, plays large-traffic constant pressure's that keeps effect, has improved the stability of gas circuit pressure.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1a is a schematic view of a check valve;

FIG. 1b is an axial schematic view of a sealing bevel and a valve body sealing ring in the check valve shown in FIG. 1 a;

FIG. 1c is a schematic view of another check valve;

FIG. 2a is a schematic view of the check valve shown in FIG. 1a in a connected state;

FIG. 2b is a schematic view of the position of the valve body and the spool in the communication state of the check valve shown in FIG. 1 a;

FIG. 2c is a schematic view of the force applied to the end of the spool in the check valve of FIG. 1 a;

FIG. 3 is a schematic structural view of a first embodiment of a valve structure provided by the present invention;

FIG. 4a is a schematic view of the valve structure of FIG. 3 showing the gas flow in the connected state;

FIG. 4b is a schematic diagram of the vulnerable zone of the valve structure shown in FIG. 3 in a communication state;

FIG. 4c is a schematic diagram of the valve stem and annular groove in the disconnected state of the valve structure shown in FIG. 3;

FIG. 4d is a schematic diagram of the forces applied to the end of the spool in the valve structure of FIG. 3;

fig. 5 is a partial enlarged view of a portion a in fig. 3;

FIG. 6 is a schematic structural view of a second embodiment of a valve structure provided by the present invention;

FIG. 7 is a partial schematic view of a spool and abutment structure of a third embodiment of the valve structure provided in the present invention;

FIG. 8 is a schematic diagram of a pore structure cylinder in the valve structure of FIG. 3;

FIG. 9 is a schematic view of a check valve according to the present invention;

FIG. 10a is a front view of the end cap of the check valve of FIG. 9;

FIG. 10b is a top view of the end cap of the check valve shown in FIG. 9;

FIG. 11 is a schematic structural view of a multi-stage flux control valve provided by the present invention;

fig. 12 is a schematic structural view of a multi-stage spool in the multi-stage flux control valve provided by the present invention;

FIG. 13 is a sectional view taken along line B-B of FIG. 12;

FIG. 14 is a schematic diagram of the valve structure in the multi-stage flux control valve of FIG. 11;

fig. 15 is a schematic view of an air path system provided by the present invention.

The reference numbers illustrate:

10', a valve body; 11', a fluid channel;

121', a flow channel inlet end; 122', a flow channel outlet end;

13', a sealing bevel; 14', a sealing surface;

20', a valve stem; 21', an annular space; 22', a valve post sealing ring;

30', flow trajectory; 311', direction of gas application; 312', spool movement direction; 313', skew direction;

32', vulnerable areas; 40', a throat;

50', a spool spring;

10. a valve body; 11. a fluid channel; 111. a first channel segment; 112. a second channel segment; 113. a third channel segment; 121. a flow channel inlet end; 122. a flow passage outlet end; 131. a flange; 1311. a gland; 132. an end cap;

20. a spool; 21. an annular space;

30. an annular projection; 31. a groove; 311. a spherical crown face; 32. a vulnerable area;

400. a first mating structure;

40. an abutting structure; 41. an annular groove; 411. a boss portion; 412. an inclined portion; 42. a first seal ring; 43. a sealing tube; 44. a sealing surface; 441. a second seal ring;

50. a spool spring; 60. a pore structure cylinder;

70. an outer valve body;

71. a main channel; 711. a first main channel section; 712. a second main channel section; 713. a third main channel section; 714. a main inlet end; 715. a main outlet end;

72. a second mating structure; 721. sealing the circular hole;

731. an outer flange; 732. an outer gland;

741. a first outer void structure cylinder; 742. a second outer pore structure cylinder;

80. a multi-stage spool;

81. a valve structure; 811. a monomer baffle ring; 812. a monomer end cap;

82. a monomer tank; 821. an air channel; 822. a monomer gland; 823. a single sealing ring;

83. a sealing cylindrical portion; 831. a primary seal ring; 84. a main spring;

85. a screen pipe; 851. screening holes; 852. a screen pipe baffle ring;

91. a multi-stage flux control valve; 92. an air source control device; 93. a constant pressure valve; 94. a safety valve; 95. the trachea.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

For ease of understanding, the inventors describe the specific structure and operation of the valve.

FIG. 1a is a schematic structural diagram of a check valve, and FIG. 1b is a schematic axial diagram of a sealing bevel and a sealing ring of a valve body in the check valve shown in FIG. 1 a; FIG. 1c is a schematic view of another check valve.

The one-way valve shown in fig. 1a comprises a valve body 10', a spool 20' and a spool spring 50'; the valve body 10' has a fluid passage 11' therein, and the fluid passage 11' has a cylindrical shape. The cylindrical fluid passageway 11' has a first cylindrical section adjacent the inlet end 121' of the fluid channel and a second cylindrical section adjacent the outlet end 122' of the fluid channel, the first cylindrical section having a smaller diameter than the second cylindrical section; the spool 20' is installed in the fluid passage 11', and an annular space 21' is formed between the sidewall of the spool 20' and the inner wall of the valve body 10 '; the inner wall of the valve body 10' is provided with a sealing inclined surface 13', the valve column 20' is provided with a valve column sealing ring 22', the valve column spring 50' is connected with the valve column 20', and the valve column spring 50' can push the valve column 20' to move to be abutted against the sealing inclined surface 13' so as to realize the disconnection of the one-way valve; when the valve column 20 'is separated from the sealing inclined surface 13', a gap for air flow to pass through is formed between the valve column 20 'and the sealing inclined surface 13', and the communication of the one-way valve is realized.

The one-way valve shown in fig. 1c comprises a valve body 10', a spool 20' and a spool spring 50'; the valve body 10' is provided with a fluid channel 11', and the fluid channel 11' extends along a curve; the spool 20' is in a disc shape, and the spool 20' is installed in the fluid passage 11 '; the inner wall of the valve body 10 'is provided with a sealing surface 14', a spool spring 50 'is connected with the spool 20', and the spool spring 50 'can push the spool 20' to move until the end surface of the spool 20 'is abutted against the sealing surface 14', so that the one-way valve is disconnected; when the valve column 20 'is separated from the sealing surface 14', a gap for air flow is formed between the valve column 20 'and the sealing surface 14', and the communication of the one-way valve is realized.

And analyzing the movement characteristics of the air flow of the one-way valve in the communicated state.

Take the check valve shown in fig. 1a as an example. Referring to fig. 2a and 2b, when the gas pushes the valve plug from the injection end to form an annular gap, the gas flow rate rises rapidly, and is analyzed as follows:

the diameter of the first cylindrical section in the fluid channel 11' is D, and the diameter of the second cylindrical section is D; in a communicated state, setting the stable flow rate of an injection end as u; as shown in fig. 2b, in the radial section, the diameter of the end of the spool 20 'is denoted as Dsi, and the diameter of the sealing bevel 13' at the corresponding position is denoted as Dso; the width of the gap at the end of the spool 20 'in the direction perpendicular to the sealing bevel 13' is denoted w. The flow rate of the gas at the gap is denoted u _s . As the gas flows past the end of the spool 20', a pressure differential Δ P is created across the ends.

1. Neglecting the pressure difference Δ P across, the gas flow before and after flowing over the sealing bevel 13' is constant, i.e.:

2. considering the pressure difference Δ P between the two ends, let the gas pressure near the inlet end 121 'be P1, and the gas pressure near the outlet end 122' be P2, and it can be known from the gas theorem (the temperature is the same), the PV value is constant, that is:

P ₁ V ₁ ＝P ₂ V ₂

then:

P ₁ Q ₁ ＝P ₂ Q ₂

known from formula (1):

the following can be obtained:

generally, the D: D of the check valve for laboratory use is in the range of (1-2), and D: w is in the range of (10-100); whereas a D of the industrial check valve is about 1, and w is in the range of (1000 to 10000).

Under the condition of stable flow, the ratio of P1 to P2 can be controlled within the range of (1-2) in both laboratories and industrial fields; the industrial application and the operation condition are complicated, and the condition that P1: P2 reaches the range of (10-100) often occurs.

As shown in the formula (2), the laboratory check valve (u) was used under a pressure difference neglected _s U) can reach the range of (2-30); and industrial check valve (u) _s U) can reach 500-5000.

From the formula (3), the laboratory check valve (u) was designed in consideration of the differential pressure condition _s U) can reach the range of (4-60); and industrial check valve (u) _s U) can reach 5000-500000.

The inner diameters of the check valve for laboratory and the check valve for industrial use are respectively 2mm and 30mm, and the normal pressure gas injection flow is respectively 1L/s and 10000Nm ³ For example,/d, the flow velocity u is 320m/s and 160m/s, respectively, and it can be seen that u _s Can reach over 600m/s and 80000m/s respectively, and is far greater than the sound velocity of 3400m/s.

When the gas flow rate reaches an ultrasonic state, a sonic boom phenomenon, namely an ultrasonic detonation phenomenon, is generated, and is expressed as a strong knocking sound in the pipeline on site. The destructive force is gradually accumulated to form a vulnerable area 32' at the position of the valve column 20', and then the destructive speed is accelerated, so that the edge of the valve column 20' is seriously damaged, and even cracks are formed. As shown in fig. 2a, the vulnerable area 32' is located at the end of the spool 20' and the position where the sealing bevel 13' is close to the slit.

The inventor further analyzed the valve used in the gas injection process by combining the specific structure, working process and movement characteristics of the gas flow of the check valve.

Gas injection processes are specific to water injection processes, in that the viscosity of the gas is a few thousandths of the oil-water fluid, and thus the flow is usually turbulent. Taking a check valve as an example, the damage reason of the check valve is analyzed: (1) Under the same pressure difference condition, the gas flow rate is far higher than that of liquid, the impact on the inner walls of the valve post 20' and the valve body 10' is large, particularly, under the condition of solid particles, the damage point is easy to appear on the part, contacting with the fluid, of the inner wall of the valve body 10', and the damage point is rapidly expanded; (2) In a narrow space inside the valve body 10', a local gas supersonic speed phenomenon can be generated, and a sonic explosion phenomenon can be generated, so that the wall surface is greatly damaged; (3) The part of the valve body 10' is made of brittle materials such as cast iron and the like, and the damage frequency is higher. In the state that the passage of the air path is communicated, the fluid in the gap can form high-speed airflow, the surface is easy to damage due to long-time high-speed airflow impact, gaps, cracks and the like are generated, and uneven damage points exist on the inner wall of the valve body 10'; if the inner wall surface of the spool 20 'or the valve body 10' is damaged, it is difficult to seal the valve body in the reverse flow, and the valve body cannot be effectively cut off.

In order to alleviate the technical problem that the valve in the air path is easy to damage, the inventor improves the valve.

Example one

As shown in fig. 3 and 6, the present invention provides a valve structure including: a valve body 10 provided with a fluid passage 11; a spool 20 movably connected in the fluid passage 11; the spool 20 is provided with an annular protrusion 30, the inner wall of the valve body 10 is provided with an abutment structure 40 cooperating with the annular protrusion 30, and the spool 20 can move relative to the valve body 10 until the annular protrusion 30 abuts against the abutment structure 40, so that the fluid passage 11 is closed. The end surface of the spool 20 is provided with a groove 31, and an annular projection 30 is formed at the edge of the groove 31.

The valve structure is used for sealing the valve column 20 and the valve body 10 and disconnecting the fluid passage 11 by matching the annular bulge 30 with the abutting structure 40 on the valve body 10. In the communicating state, the annular projection 30 is disengaged from the abutment structure 40, and a passage through which the air flow passes is formed between the spool 20 and the abutment structure 40.

In the valve structure, a groove 31 is formed by surrounding an annular bulge 30 on the end surface of a valve column 20; thus, in the communicating state, the air flow first impinges on the bottom surface of the recess 31 and moves outwardly along the side walls of the recess 31, and then bypasses the annular projection 30, forming a passage through the gap between the annular projection 30 and the abutment structure 40. The detour process of air current can reduce the direct impact of air current to annular arch 30, reduces the damage that annular arch 30 received, is favorable to the guarantee under the off-state, and annular arch 30 keeps good cooperation with butt structure 40, realizes the effective disconnection of gas circuit, reduces the spoilage.

Referring to fig. 2c, fig. 2c is a schematic diagram of the force applied to the end of the spool in the check valve shown in fig. 1a, the axial thrust is applied to the spool 20' by the airflow, but the stability and uniformity of the airflow are poor due to the generally turbulent airflow, so that the spool 20' is easily deflected in the deflection direction 313' shown in fig. 2 c.

To this end, the inventors have further developed the spool 20: the inner wall of the groove 31 is a smooth curved surface. Further, as shown in fig. 3-4 d, the inner wall of the recess 31 includes a spherical cap portion 311, and the spherical cap portion 311 carries the impact of the air flow and can guide the air flow to bypass the annular protrusion 30. As shown in fig. 4d, the spherical cap surface 311 can concentrate the resultant force of the impact force of the airflow on the spool 20 in the axial direction, reduce the adverse interference caused by the instability of the airflow, reduce the deflection of the spool 20, and make the spool 20 move more stably in the axial direction of the valve body 10.

Preferably, the spherical crown portion 311 is a hemispherical surface so as to guide the air flow in the axial direction of the valve body 10 and further reduce the impact on the end of the annular protrusion 30.

The shape of the groove 31 is not limited to being spherical, and for example, the inner wall of the groove 31 includes a combination of a spherical crown portion 311 and a cylindrical surface portion, the bottom of the groove 31 is the spherical crown portion 311, the inner wall of the end portion of the annular protrusion 30 is the cylindrical surface portion, and the spherical crown portion 311 is smoothly connected to the cylindrical surface portion.

In one embodiment of the present invention, as shown in fig. 3, 5 and 7, the abutting structure 40 includes an annular groove 41, and the annular projection 30 can be inserted into the annular groove 41, so that the fitting area of the spool 20 and the inner wall of the valve body 10 in the open state is increased, and the sealing performance is improved.

Further, the abutting structure 40 includes a first seal ring 42 provided at the bottom of the annular groove 41, and the annular protrusion 30 can abut against the first seal ring 42 to achieve elastic sealing.

Further, in the radial cross section of the valve body 10, the inner wall of the annular groove 41 near its axis is curved so that the inner wall of the annular groove 41 near its axis forms a convex portion 411, and the convex portion 411 protrudes outward in the radial direction of the spool 20. As shown in fig. 4c and 5, when the annular protrusion 30 extends into the annular groove 41, the end of the annular protrusion 30 abuts against the first seal ring 42 to form an elastic seal; spherical crown portion 311 and bellying 411 butt form the metal and seal firmly, and double seal structure is favorable to ensureing sealed effect and durability.

Further, as shown in fig. 4a and 5, the top of the inner wall of the annular groove 41 away from the axis thereof is provided with an inclined portion 412, the inclined portion 412 is inclined outward in a direction from the bottom of the annular groove 41 toward the top, and the inclined portion 412 gradually increases the opening of the annular groove 41 toward the outer end. By providing the inclined portion 412, it is facilitated to guide the spool 20 into the annular groove 41, and to guide the airflow more stably into the annular space 21 between the side wall of the spool 20 and the inner wall of the valve body 10 in the communicating state, attenuating the impact of the airflow.

Referring to fig. 4a and 4b, under the impact of the airflow, the vulnerable area 32 of the valve structure is located: the position of the inner edge of the end of the annular projection 30, the top of the inner wall of the annular groove 41 close to its axis, and the top of the inner wall of the annular groove 41 remote from its axis. Referring to fig. 4c and 5, the end surface of the annular protrusion 30 of the valve structure is engaged with the first sealing ring 42, and the inner wall of the groove 31 is engaged with the protrusion 411 to achieve sealing. This valve structure has weakened the impact of air current through recess 31 on the one hand, and on the other hand makes the easily damaged area 32 disperse to non-sealing position, is favorable to reducing the sealed position and receives the strong effect impact of air current, has improved sealed effect and durability, has prolonged sealed cycle, is favorable to reducing and changes the maintenance frequency.

In one embodiment of the present invention, the surface of the annular protrusion 30 is provided with a metal coating. Specifically, the inner wall of the groove 31 is provided with a metal coating.

In one embodiment of the present invention, the surface of the annular groove 41 is provided with a metal coating.

In one embodiment of the present invention, the surface of the annular protrusion 30 and the surface of the annular groove 41 are both provided with a metal coating. Preferably, the inner wall of the groove 31, the outer wall and the end face of the annular protrusion 30, and the wall surface at the opening of the annular groove 41 are provided with a metal coating. The metal coating not only enhances corrosion resistance, but also enhances impact resistance, and reduces the occurrence of breakage in the vulnerable area 32.

Further, the metal coating comprises any one or combination of more of tantalum and niobium, so that the metal coating has good temperature resistance and corrosion resistance, and is more suitable for operation in a high-temperature industrial environment of a gas injection process.

Further, the thickness of the metal coating is greater than or equal to 30 μm, so that the metal coating has stronger firmness.

In one embodiment of the present invention, as shown in fig. 3 and 6, the valve structure includes a spool spring 50, a first end of the spool spring 50 is connected to the valve body 10, a second end of the spool spring 50 is connected to the spool 20, and the spool spring 50 can drive the spool 20 to move until the annular protrusion 30 abuts against the abutting structure 40. When the force of the airflow on the spool 20 reaches a predetermined pressure under the condition that the airflow moves from the flow passage inlet end 121 to the flow passage outlet end 122 of the fluid passage 11, the force can overcome the elastic force of the spool spring 50 to drive the spool 20 away from the abutting structure 40, so as to achieve communication of the valve structure.

The driving force for driving the valve stem 20 to abut against the abutting structure 40 in the valve structure may be provided by the valve stem spring 50, or may be provided by other external forces, for example, by manually driving the valve stem 20 to move into abutment against the abutting structure 40 to disconnect the valve structure, or manually driving the valve stem 20 to disengage from the abutting structure 40 to connect the valve structure.

The structural form of the valve body 10 and the structural form of the fluid passage 11 may be designed according to the characteristics of the application scenario and the characteristics of the air flow.

In an embodiment of the present invention, as shown in fig. 3, the fluid channel 11 is a column, the valve column 20 can move along the axial direction of the fluid channel 11, and the valve structure is suitable for a laboratory or other scenes with high fluid purity. Further, the valve body 10 comprises a sealing tube 43 fixed in the fluid passage 11, the abutment structure 40 being provided at an end of the sealing tube 43. Preferably, both the inner and outer walls of the front portion of the sealing tube 43 are provided with a metal coating.

In another embodiment of the present invention, as shown in fig. 6, the fluid channel 11 includes a first channel segment 111, a second channel segment 112 and a third channel segment 113 which are communicated in sequence, so that the fluid channel 11 extends along a curve; the second channel segment 112 is cylindrical; the abutting structure 40 is provided at a joint of the first passage section 111 and the second passage section 112, and the spool 20 is provided at the second passage section 112 so as to be movable in the axial direction of the second passage section 112. A gland 1311 is connected to the end of the second channel section 112 to abut the spool spring 50.

As shown in fig. 6, the spool 20 is disc-shaped and the abutment structure 40 includes a sealing surface 44 that mates with an end surface of the spool 20. Preferably, the abutment structure 40 comprises a second sealing ring 441 provided on the sealing surface 44. The valve structure can be applied to industrial application scenes under the conditions of high pressure and large flow.

Furthermore, the first channel section 111 is connected to the end of the second channel section 112, the third channel section 113 is connected to the side wall of the first channel section 111, and the first channel section 111 and the second channel section 112 are staggered, so that the air flow is buffered, and the impact of the air flow is weakened. As shown in fig. 6, the first passage section 111 includes a radially extending section extending in the radial direction of the second passage section 112, and the gas flow first flows along the radially extending section, then turns to flow in the axial direction of the second passage section 112, and flows toward the second passage section 112 along the end surface of the second passage section 112, so that the impact of the gas flow on the spool 20 can be effectively reduced.

Example two

As shown in fig. 3 and 6, the present invention provides a valve structure including: a valve body 10 provided with a fluid passage 11; a spool 20 movably connected in the fluid passage 11; the inner wall of the valve body 10 is provided with a first matching structure 400 matched with the valve column 20, and the valve column 20 can move relative to the valve body 10 to abut against the first matching structure 400 so as to close the fluid channel 11; the fluid passage 11 is provided with a pore structure cylinder 60, and the pore structure cylinder 60 is located on the side of the first fitting structure 400 far away from the valve post 20.

The gas flow usually contains solid particles, and the solid particles carried by the high-speed gas flow can cause stronger damage to the wall surface. According to the valve structure provided by the invention, the pore structure cylinder 60 can block solid particles on one hand, and on the other hand, high-speed gas flows through complex pores in the pore structure cylinder 60, and the flow state is changed into turbulent flow under the blocking effect, so that the turbulence degree reaches more than 5%, and ultrasonic explosion is effectively reduced, thereby reducing the damage of the gas flow to the valve body 10 and the valve column 20.

Referring to fig. 3 and 8, the pore structure cylinder 60 is fixed on one side of the sealing tube 43 near the inlet end 121 of the flow channel, the sidewall of the pore structure cylinder 60 is engaged with the inner wall of the first cylinder section, the end surface is abutted against the sealing tube 43, and the airflow passes through the pore structure cylinder 60 and enters the sealing tube 43. Referring to fig. 6, the pore structure cylinder 60 is fixed at an end of the first channel section 111 close to the second channel section 112, and after the airflow flows into the pore structure cylinder 60, the airflow turns and then flows to the second channel section 112, and the pore structure cylinder 60 can play a good role in buffering and filtering the airflow, thereby effectively reducing the impact force of the airflow.

The valve structure can be a valve column 20 which comprises the annular protrusion 30 structure, or a conical structure shown in fig. 1a, or a disc-shaped structure shown in fig. 1 c; the first mating structure 400 may adopt the corresponding abutment structure 40 shown in fig. 3, 6 or 7, or the sealing bevel 13 'structure shown in fig. 1a, and may also adopt the sealing surface 14' structure shown in fig. 1 c.

Further, the pore structure cylinder 60 is made of corrosion-resistant metal powder by sintering. Preferably, the corrosion-resistant metal powder comprises titanium or a titanium alloy.

Further, the pore structure columns 60 have a pore size greater than or equal to 10 μm.

Further, the porosity of the pore structure columns 60 is greater than or equal to 2 darcy.

Further, the seepage resistance of the pore structure cylinder 60 is less than or equal to 0.01MPa.

The porous structure cylinder 60 provides a greater seepage resistance to the airflow than the pipe flow, which effectively reduces the impact of the airflow on the spool 20 and the first mating structure 400.

EXAMPLE III

As shown in fig. 3, 6 and 7, the present invention provides a valve structure including: a valve body 10 provided with a fluid passage 11; a spool 20 movably connected in the fluid passage 11; the spool 20 is provided with an annular protrusion 30, the inner wall of the valve body 10 is provided with an abutment structure 40 cooperating with the annular protrusion 30, and the spool 20 is movable relative to the valve body 10 until the annular protrusion 30 abuts against the abutment structure 40, so that the fluid passage 11 is closed. The end surface of the spool 20 is provided with a groove 31, and an annular projection 30 is formed at the edge of the groove 31. A void structure cylinder 60 is provided in the fluid passage 11, the void structure cylinder 60 being located on a side of the abutment structure 40 remote from the spool 20.

The valve structure has the following advantages:

1. the pore structure cylinder 60 not only plays a role in filtering solid particles, but also plays a role in breaking high-speed airflow to form turbulent flow and breaking sonic boom forming conditions;

2. the annular protrusion 30 and the annular groove 41 reduce the continuous strong effect of the air flow on the sealing position, improve the durability, and reduce the overall failure of the sealing performance caused by the breakage of part of the sealing position.

Example four

The present invention provides a check valve, as shown in fig. 6, 9, 10a and 10b, which includes the above-described valve structure, and end caps 132 or flanges 131 are connected to both ends of the fluid passage 11. The valve structure may be the above valve structure having the annular protrusion 30 or the valve structure having the pore structure cylinder 60, or the valve structure having both the annular protrusion 30 and the pore structure cylinder 60 may be used.

The check valve can block the flow of air from the flow channel outlet end 122 to the flow channel inlet end 121 of the fluid channel 11, and has a function of controlling the direction of the air flow. In the case where the air flow is from the flow path outlet end 122 to the flow path inlet end 121, when the air flow pressure reaches the set opening pressure, the spool 20 is away from the first fitting structure 400, and the check valve achieves the open communication, that is, the check valve also has a constant pressure control function.

EXAMPLE five

The present invention provides a multistage flux control valve, as shown in fig. 11, comprising: an outer valve body 70 provided with a main passage 71; a multistage valve core 80 provided in the main passage 71, the multistage valve core 80 having a plurality of valve structures 81 provided in parallel; the valve structure 81 comprises a valve body 10, a valve column 20 and a valve column spring 50, wherein the valve body 10 is provided with a fluid channel 11, and two ends of the fluid channel 11 are communicated with the main channel 71; the valve column 20 is movably connected in the fluid passage 11, the inner wall of the valve body 10 is provided with a first matching structure 400 matched with the valve column 20, and the valve column spring 50 is connected with the valve column 20, so that the valve column 20 has the tendency of moving to be matched with the first matching structure 400 to close the fluid passage 11; each valve structure 81 has a first opening pressure, and the valve column 20 can be separated from the first matching structure 400 under the action of the first opening pressure, so that two ends of the fluid channel 11 are communicated; the plurality of valve structures 81 includes a plurality of stages of first cracking pressures.

Outer flanges 731 are provided at both ends of the outer valve body 70, and through holes communicating with the main passage 71 are provided in the outer flanges 731. As shown in FIG. 11, the main passage 71 has a main inlet end 714 at the end of the first mating structure 400 distal from the spool 20 and a main outlet end 715 at the end of the spool 20 distal from the first mating structure 400. The multi-stage flux control valve is connected into the gas circuit and remains off with gas flow from the main outlet port 715 to the main inlet port 714. In the case of a flow of gas from the main inlet end 714 to the main outlet end 715, when the pressure in the main passage 71 reaches the minimum level of the first cracking pressure, the spool 20 in the valve structure 81 having the minimum level of the first cracking pressure is disengaged from the first fitting structure 400, the valve structure is communicated, the main passage 71 is communicated through the valve structure 81, and the other valve structures are kept disconnected; as the flow rate in the main passage 71 continues to increase and the pressure gradually increases, the valve structures 81 in the multistage flux control valve open communication in order of the first opening pressure.

Each valve structure 81 in the multistage flux control valve can be automatically opened along with the change of pressure in the main channel 71, so that the gas path can be kept constant at a plurality of pressure levels, the multistage regulation of the pressure of the gas path is realized, and the effect of keeping constant pressure at large flow is achieved.

The valve structure 81 in the multi-stage flux control valve provided by the present invention can adopt the above-mentioned valve structure with the annular protrusion 30, the valve structure 81 with the pore structure column 60, or the valve structure with both the annular protrusion 30 and the pore structure column 60, and can also adopt the one-way valve shown in fig. 1 a.

The magnitude of the first opening pressure of each valve structure 81 can be set by setting the modulus of elasticity of the spool spring 50, the size of the diameter of the fluid passage 11, or the size of the spool 20. In some embodiments, there are 5 valve structures 81 on the multi-stage valve cartridge 80; preferably, the first opening pressure of each valve structure 81 is 9.96MPa, 9.98MPa, 10.0MPa, 10.02MPa and 10.04MPa, respectively, and constant pressure control with a constant pressure of 10 ± 0.04MPa and a pressure difference of 0.02MPa can be realized.

As shown in fig. 12 and 13, the multistage valve core 80 is provided with a plurality of single body grooves 82 in a columnar shape, the valve structure 81 is installed in the single body groove 82, and the valve body 10 is fixed in the single body groove 82. Further, one end of the monomer tank 82 near the main inlet end 714 is connected to an air passage 821, and the other end of the air passage 821 is communicated with the main passage 71, and the diameter of the air passage 821 is smaller than that of the monomer tank 82. The end surface of the multi-stage valve core 80 close to the main outlet port 715 is connected with a single body gland 822 to press the valve structure 81 in the single body groove 82; preferably, a plurality of single sealing rings 823 which are matched with the single groove 82 are arranged between the single gland 822 and the multi-stage valve core 80.

In order to make the valve structure 81 and the multistage valve core 80 well fit, the inventor makes an improvement on the valve structure 81: as shown in fig. 14, a single block ring 811 and a single end cap 812 are respectively connected to two ends of the valve body 10, an inlet communicated with the air channel 821 is formed on the single block ring 811, and an outlet communicated with the through hole of the single gland 822 is formed on the single end cap 812.

In one embodiment of the invention, as shown in fig. 11, the multi-stage flux control valve includes a main spring 84; the multistage valve core 80 is movably connected with the main channel 71, the inner wall of the outer valve body 70 is provided with a second matching structure 72 matched with the multistage valve core 80, and the main spring 84 is connected with the multistage valve core 80, so that the multistage valve core 80 has the tendency of moving to be connected with the second matching structure 72 to seal the main channel 71; the multistage flux control valve has a second opening pressure, and the multistage valve core 80 can be separated from the second matching structure 72 under the action of the second opening pressure, so that two ends of the main channel 71 are communicated; the second cracking pressure is greater than the first cracking pressure. When the flow in the main channel 71 continues to increase and the pressure gradually increases, the flow exceeds the maximum first opening pressure, and when the second opening pressure is reached, the airflow pressure overcomes the elastic force of the main spring 84, the multistage valve core 80 is pushed to move, a channel is formed between the multistage valve core 80 and the second matching structure 72, the air channel can keep constant at the second opening pressure, and the effect of keeping the large flow constant is achieved.

The magnitude of the second opening pressure can be set by setting the size of the main spring 84 or the multi-stage spool 80.

Referring to fig. 11, the multi-stage valve core 80 has a sealing cylindrical portion 83, and the second engaging structure 72 includes a sealing circular hole 721 engaged with the sealing cylindrical portion 83, so that when the sealing cylindrical portion 83 extends into the sealing circular hole 721, the multi-stage valve core 80 separates the main passage 71. Further, the main sealing ring 831 is sleeved on the sealing cylindrical portion 83, and is matched with the second matching structure 72 through the main sealing ring 831, so that the sealing effect between the multistage valve core 80 and the second matching structure 72 is improved.

The main passage 71 may be cylindrical or may extend along a curve. In order to adapt to a large-flow application scenario and reduce the impact of the air flow on the multistage valve core 80, as shown in fig. 11, the main channel 71 includes a first main channel section 711, a second main channel section 712, and a third main channel section 713 that are sequentially communicated, and the second main channel section 712 is in a cylindrical shape; the first main passage section 711 is connected to the end of the second main passage section 712, and the third main passage section 713 is connected to the sidewall of the first main passage section 711. The multistage spool 80 is provided at the junction of the first main passage section 711 and the second main passage section 712, and the multistage spool 80 is movable in the second main passage section 712. An outer gland 732 is connected to the end of the second main channel section 712 to abut the main spring 84.

In an embodiment of the invention, referring to fig. 11, a first external aperture structure cylinder 741 is fixedly disposed in the main channel 71, and the first external aperture structure cylinder 741 is disposed on a side of the first mating structure 400 away from the spool 20. As the air flows from the main inlet end 714 to the main outlet end 715, the air flows through the first outer orifice structure post 741 to the multistage valve cartridge 80. The first external pore structure cylinder 741 can block solid particles on one hand, and on the other hand, high-speed gas flows through complex pores in the first external pore structure cylinder 741, and under the blocking effect, the flow state is changed into turbulent flow, so that the degree of turbulence can reach more than 5%, and ultrasonic explosion is effectively reduced, thereby reducing the damage of the gas flow to the valve body 10 and the valve column 20. The first outer-hole-structure cylinder 741 can also have good buffering and filtering effects on the air flow, and effectively reduce the impact force of the air flow.

Further, the first external-aperture-structure cylinder 741 is made of a corrosion-resistant metal powder by sintering. Preferably, the corrosion-resistant metal powder comprises titanium or a titanium alloy.

Further, the pore dimension of the first outer pore structure cylinder 741 is greater than or equal to 10 μm.

Further, the first outer void structure column 741 has a void permeability greater than or equal to 2 darcy.

Further, the seepage resistance of the first outer pore structure cylinder 741 is less than or equal to 0.01MPa.

Compared with pipe flow, the first external-aperture-structure cylinder 741 generates a larger seepage resistance to the airflow, and can effectively reduce the impact of the airflow on the multistage valve core 80 and the valve structure 81.

In an embodiment of the present invention, referring to fig. 12, the multi-stage valve core 80 is connected to a second outer pore structure cylinder 742, and the second outer pore structure cylinder 742 is located on a side of the first mating structure 400 away from the valve post 20. As the air flows from the main inlet end 714 to the main outlet end 715, the air flows through the second outer porous structure cylinder 742 and then to the multistage valve cartridge 80. On one hand, the second outer pore structure cylinder 742 can block solid particles, on the other hand, high-speed gas flows through complex pores in the second outer pore structure cylinder 742, and under the blocking effect, the flow state is changed into turbulent flow, so that the turbulence degree can reach more than 5%, and ultrasonic explosion is effectively reduced, so that the damage of the gas flow to the valve body 10 and the valve column 20 is reduced. The second outer porous structure cylinder 742 can also play a better role in buffering and filtering the airflow, thereby effectively reducing the impact force of the airflow.

Further, the second outer pore structure cylinder 742 is made by sintering corrosion-resistant metal powder. Preferably, the corrosion-resistant metal powder comprises titanium or a titanium alloy.

Further, the pore size of the second outer pore structure cylinders 742 is greater than or equal to 10 μm.

Further, the second outer pore structure cylinder 742 has a void permeability greater than or equal to 2 darcy.

Further, the second outer pore structure cylinder 742 has a seepage resistance of less than or equal to 0.01MPa.

Compared with pipe flow, the second outer pore structure cylinder 742 generates larger seepage resistance to air flow, and can effectively reduce impact of the air flow on the multistage valve core 80 and the valve structure 81.

Referring to fig. 12, the end of the multi-stage valve core 80 is provided with a sieve tube 85, each fluid passage 11 is communicated with the sieve tube 85, and the side wall of the sieve tube 85 is provided with a sieve hole 851 communicated with the main passage 71; the second outer porous structure cylinder 742 is placed in the screen 85 and the end of the screen 85 is attached to a screen retainer 852 that abuts the second outer porous structure cylinder 742. The screen 85 and the second outer porous structure cylinder 742 are capable of moving with the multi-stage spool 80. The air flow in the main channel 71 flows through the sieve holes 851 and the second outer porous structure cylinder 742 to the multistage valve core 80, so that the impact can be better alleviated.

EXAMPLE six

The present invention provides an air path system, as shown in fig. 15, the air path system includes: the constant-flux control valve comprises an air pipe 95, an air source control device 92, a safety valve 94, a constant-pressure valve 93 and the multi-stage flux control valve 91, wherein the preset pressure of the constant-pressure valve 93 is greater than a second opening pressure; the air supply control device 92 is connected to the air pipe 95, the safety valve 94 and the constant pressure valve 93 are connected in parallel to the air pipe 95, and the multistage flux control valve 91 is connected in series to the air pipe 95. When the flow in the air pipe 95 continues to increase, the pressure continues to increase to exceed the second opening pressure and exceed the preset pressure of the constant pressure valve 93, the constant pressure valve 93 opens to work, and part of the air is evacuated in a constant pressure manner; when the pressure increases beyond a safe value, the safety valve 94 opens to vent the gas at a large discharge.

In one embodiment of the present invention, the air supply control device 92 comprises an air pump.

The above description is only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.

Claims

1. A multi-stage flux control valve, comprising:

an outer valve body provided with a main passage;

the multi-stage valve core is arranged in the main channel, and a plurality of valve structures are arranged in the multi-stage valve core in parallel;

the valve structure comprises a valve body, a valve column and a valve column spring, the valve body is provided with a fluid channel, and two ends of the fluid channel are communicated with the main channel;

the valve rod is movably connected in the fluid channel, a first matching structure matched with the valve rod is arranged on the inner wall of the valve body, and the valve rod spring is connected with the valve rod, so that the valve rod has the tendency of moving to be matched with the first matching structure to close the fluid channel;

each valve structure is provided with a first opening pressure, and the valve column can be separated from the first matching structure under the action of the first opening pressure, so that two ends of the fluid channel are communicated;

a plurality of the valve structures comprise a plurality of stages of the first cracking pressure.

2. The multi-stage flux control valve of claim 1, wherein the multi-stage spool has a plurality of unitary grooves therein, the valve structure being mounted in the unitary grooves.

3. The multi-stage flux control valve of claim 1, wherein said main channel has a first external orifice structure post secured therein, said first external orifice structure post being located on a side of said first mating structure remote from said spool.

4. The multi-stage flux control valve of claim 1, wherein a second outer void structure cylinder is connected to said multi-stage spool, said second outer void structure cylinder being located on a side of said first mating structure remote from said spool.

5. The multi-stage flux control valve of claim 4, wherein the end of said multi-stage valve core is provided with a screen, each of said fluid passages is in communication with said screen, and the side wall of said screen is provided with a screen mesh in communication with said main passage; the second outer pore structure cylinder is arranged in the sieve tube.

6. The multi-stage flux control valve of claim 1, wherein said multi-stage flux control valve comprises a main spring; the multistage valve core is movably connected with the main channel, a second matching structure matched with the multistage valve core is arranged on the inner wall of the outer valve body, and the main spring is connected with the multistage valve core, so that the multistage valve core has a tendency of moving to be connected with the second matching structure to seal the main channel;

the multistage flux control valve has a second opening pressure, and the multistage valve core can be separated from the second matching structure under the action of the second opening pressure so as to enable the two ends of the main channel to be communicated;

the second cracking pressure is greater than the first cracking pressure.

7. The multi-stage flux control valve of any one of claims 1-6, wherein said primary channel comprises a first primary channel section, a second primary channel section and a third primary channel section in sequential communication, said second primary channel section being cylindrical;

the multistage valve core is arranged at the joint of the first main channel section and the second main channel section, the first main channel section is connected to the end part of the second main channel section, and the third main channel section is connected to the side wall of the first main channel section.

8. The multi-stage flux control valve of any one of claims 1-6, wherein the spool is provided with an annular protrusion, and the first mating structure comprises an annular groove that mates with the annular protrusion, the annular protrusion being capable of extending into the annular groove.

9. The multi-stage flux control valve of claim 8, wherein an end face of said spool is provided with a groove, and said annular projection is formed at an edge portion of said groove.

10. The multi-stage flux control valve of claim 9, wherein the inner wall of the groove comprises a spherical cap surface.

11. The multi-stage flux control valve of claim 9, wherein a bottom of said annular groove is provided with a sealing ring, said annular protrusion being abuttable to said sealing ring.

12. The multi-stage flux control valve of claim 9, wherein an inner wall of the annular groove near its axis is provided with a raised portion.

13. The multi-stage flux control valve of claim 9, wherein a surface of said annular projection is provided with a metal coating and/or a surface of said annular groove is provided with a metal coating.

14. The multi-stage flux control valve of claim 9, wherein said fluid passage is cylindrical, said spool being movable in an axial direction of said fluid passage; the valve body comprises a sealing pipe fixed in the fluid channel, and the first matching structure is arranged at the end part of the sealing pipe.

15. The multi-stage flux control valve of claim 9, wherein a porosity cylinder is disposed in said fluid passageway on a side of said first mating structure distal from said spool.

16. The multi-stage flux control valve of claim 15, wherein said pore structure cylinder has a void permeability greater than or equal to 2 darcy.

17. An air path system, comprising: gas pipes, gas source control devices, safety valves, constant pressure valves and multi-stage flux control valves according to any one of claims 1 to 16; the gas source control device is connected with the gas pipe, the safety valve and the constant pressure valve are connected in parallel with the gas pipe, and the multistage flux control valve is connected in series with the gas pipe.