CN113294533A

CN113294533A - Pressure reducing valve

Info

Publication number: CN113294533A
Application number: CN202110678282.0A
Authority: CN
Inventors: 赵颖; 杨小军; 曹磊; 方兴; 林杰
Original assignee: Quzhou Intelligent Manufacturing Technology And Equipment Research Institute
Current assignee: Quzhou Intelligent Manufacturing Technology And Equipment Research Institute
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2021-08-24

Abstract

The invention provides a pressure reducing valve which comprises a valve core and a flow passage, wherein an inlet is arranged below the valve core, an outlet is arranged on the left side of the valve core, and the valve core is respectively connected with the inlet and the flow passage through the flow passage; the valve core is provided with a first inclined plane, the initial section and the tail end of the inclined plane of the valve core are respectively provided with an inclined plane, namely, one inclined plane is designed into the combination of two inclined planes, and the fillet transition is carried out at the corner joint of the inclined planes; the inlet and the outlet are connected by flanges with 8 bolts. The length of the first inclined surface (302) is 6 mm. The first inclined plane and the horizontal plane form an included angle of 50 degrees. Compared with other valve core structures, the valve core structure designed by the invention has the performance of being suitable for larger flow and better pressure reduction effect.

Description

Pressure reducing valve

Technical Field

The invention relates to the technical field of valves, in particular to a pressure reducing valve.

Background

The valve is an important fluid regulating unit in a fluid control system, has a wide application range, and is large in industrial production and small in resident life. The valve is mainly applied to drilling and production of petroleum and natural gas, storage and transportation of petroleum and natural gas, and hydraulic and flood discharge management systems; in chemical production, medical drug manufacturing; in the electric power industry of the domestic main energy production industry, namely hydroelectric power generation, thermal power generation and nuclear power generation; transportation tools such as trains, ships, automobiles, airplanes and the like which are usually utilized by people. In particular, the oil and gas production sites, storage and transportation, where the production and use of energy is maximized, use a variety of valves and fittings.

The main working principle of various throttling valves used in oil and natural gas production fields is that the opening of the throttling valve is changed by pushing and returning a valve rod, so that the purpose of regulating pressure and controlling flow is achieved, the processing and production of oil and natural gas are safer, and production accidents are effectively avoided. The fluid flowing from the wellhead at the production site of the oil and gas field has relatively high pressure and a small amount of solid particles in the fluid due to production, so the fluid in the throttling valve at the production site is generally high-pressure fluid and the phenomenon that the solid particles flow to erode the flow channel and the valve core of the valve is generated. The high-pressure fluid makes the throttle valve need bear higher pressure, and solid particles can erode the valve to destroy the throttle valve, and the damage can cause production accidents, property loss and even human casualties.

Disclosure of Invention

The invention aims to solve the technical problem that the existing throttle valve adopts a special structure to reduce pressure.

The purpose and the effect of the pressure reducing valve are achieved by the following specific technical means:

a pressure reducing valve comprises a valve core 3 and a flow passage 2, wherein an inlet 1 is arranged below the valve core 3, an outlet 4 is arranged on the left side of the valve core 3, and the valve core 3 is respectively connected with the inlet 1 and the flow passage 4 through the flow passage 2;

the valve core 3 is provided with a first inclined plane 302, the initial section and the tail end of the inclined plane of the valve core 3 are respectively provided with an inclined plane, namely, one inclined plane is designed into the combination of two inclined planes, and the corner joint of the inclined planes is subjected to fillet transition;

the inlet 1 and the outlet 4 are connected by flanges with 8 bolts.

Further preferred embodiments: the length of the first inclined surface 302 is 6 mm.

Further preferred embodiments: the first inclined surface 302 forms an included angle 301 with the horizontal plane, which is 50 degrees.

Further preferred embodiments: the diameters of the inlet 1 and the outlet 4 are both selected to be 65 mm.

Has the advantages that:

when the two inclined planes of the valve core are 50 degrees and the first section of the inclined plane is 6mm, the fluid in the throttle valve has small erosion to the valve core, the pressure drop effect is better than that of other structures on the market, and the maximum speed is not very high. It is discovered that the structure of the valve core after erosion has a depth of 0.2mm, the fluid has little influence on parameters such as the erosion rate, pressure and maximum speed of the throttle valve, the erosion rate is increased at 0.2mm, the erosion rate, the pressure difference and the maximum speed are basically unchanged when the erosion depth is increased, the pressure drop of the throttle valve fluctuates along with the increase of the erosion depth, but the data change is not large, and the fluid speed is increased all the time when the erosion depth is greater than 2mm, so that early warning can be performed according to the erosion depth, and the valve core can be replaced when the erosion depth reaches 2mm, thereby effectively preventing accidents.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a view of the valve cartridge of the present invention;

FIG. 3 is a view of the valve flow channel of the present invention;

FIG. 4 is a front view of the valve cartridge of the present invention;

FIG. 5 is a diagram of simulation results of valve core structures at different angles according to the present invention;

FIG. 6 is a simulated contrast plot of different lengths of the ramp of the present invention;

FIG. 7 is a graph of the maximum velocity change at different flow rates for the present invention compared to comparative example one and comparative example two;

FIG. 8 is a graph of differential pressure change at different flow rates for the present invention compared to comparative example one and comparative example two;

FIG. 9 is a schematic view of a structure of a comparative example of the present invention;

FIG. 10 is a schematic structural view of a second comparative example of the present invention;

in FIGS. 1-10: 1. an inlet; 2. a flow channel; 3. a valve core; 301. an included angle; 302. a first inclined plane; 4. and (7) an outlet.

Detailed Description

As shown in figures 1 to 10:

the inlet 1 and the outlet 4 are connected by flanges with 8 bolts.

Wherein the length of the first inclined surface 302 is 6 mm.

Wherein, the included angle 301 formed by the first inclined surface 302 and the horizontal plane is 50 degrees.

Wherein, the diameter of the inlet 1 and the outlet 4 is 65 mm.

To further verify that the valve core structure of the present invention has better erosion and pressure drop resistance compared to other valve core structures, please refer to fig. 7 and 8.

As shown in fig. 7, the first structure is a first comparative structure, the second structure is a second comparative structure, and the third structure is a valve core structure of the present invention, it can be seen from fig. 7 that the maximum speeds of the three structures gradually increase with the increase of the inlet speed, and the increasing slopes of the maximum speeds of the three structures are substantially consistent, when the three structures are fed at the same speed, the speed of the first structure is the maximum, and the speed of the second structure is the minimum.

As shown in fig. 8, it can be seen that the differential pressure across the throttle valve is constantly higher as the inlet speed increases, and the differential pressure across the second configuration is slower as the inlet speed increases. At the same inlet speed, the pressure difference of the first structure is the largest, and the pressure difference of the second structure is the smallest, namely, the pressure control effect of the first structure is the best, and the pressure control effect of the second structure is the worst. Therefore, in summary, the third structure, that is, the valve core structure of the present invention, has both good pressure control capability and good flow rate applicability capability.

Meanwhile, in order to further prove that the valve core structure of the present invention can be added to the valve core structure when the first inclined plane is 6mm and the included angle with the horizontal plane is 50 degrees, please refer to fig. 5 and fig. 6.

As shown in fig. 5, the fluctuation of the maximum speed in the throttle valve is large with the change of the angle, and the pressure difference between the inlet and the outlet of the throttle valve is gradually reduced as the slope angle increases, wherein the erosion rate is the minimum when the slope angle is 70 degrees, and the pressure reduction effect, the maximum speed and the pressure difference reach the maximum at 60 degrees. From the maximum speed data, the erosion rate at 50 ° is smaller than 40 ° and 60 °, and although the pressure reduction effect at 40 ° and 60 ° is better than 50 °, the maximum speed and the erosion rate are both larger than 50 °, which reduces the maximum flow rate of the throttle valve and the service life of the valve, the maximum speed at 50 ° is substantially the same as that at 70 °, and the pressure reduction is 2MPa smaller than 50 ° although the erosion rate at 70 ° is smaller than 50 °. Therefore, the maximum speed, the erosion rate and the inlet-outlet pressure difference of the fluid in the throttling valve are comprehensively considered, and the 50-degree structure is the best.

As shown in fig. 6, the change of the flow field of the throttle valve is relatively large due to the different lengths of the inclined surfaces of the valve cores, and the maximum speed and the pressure difference are gradually reduced with the increase of the lengths of the inclined surfaces, because the flow area of the fluid is gradually increased with the increase of the lengths of the inclined surfaces at the same opening of the throttle valve, so that the speed of the valve core at the position of the throttle valve where the fluid speed is maximum is reduced, the flow area is increased, the local resistance at the throttle position is reduced, the collision friction between particles is reduced when the fluid speed is reduced, and the energy loss of the fluid is reduced, so that the pressure difference between the inlet and the outlet is gradually reduced. The erosion rate of the throttle valve is the greatest at the position where the length of the inclined plane is 10mm, and the area with the most serious erosion is on a flow channel of a fluid backflow part below the valve core, the main reason is caused by repeated friction and impact of the fluid backflow on the flow channel, and the erosion rates of other structures are different from each other, but are smaller than that of the valve core structure with the length of 10 mm. Compared with 6 groups of data, when the length of the inclined plane is 6mm, the maximum speed is higher, but the pressure drop effect is better than that of other structures, and the erosion rate is lower.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can cover the scope of the present invention without any changes or substitutions that may be made without inventive work within the technical scope disclosed in the present invention, and therefore, the scope of the present invention should be determined by the scope of the claims.

Claims

1. The pressure reducing valve comprises a valve core (3) and a flow passage (2), and is characterized in that: an inlet (1) is arranged below the valve core (3), an outlet (4) is arranged on the left side of the valve core, and the valve core (3) is respectively connected with the inlet (1) and the flow channel (4) through the flow channel (2);

a first inclined plane (302) is arranged on the valve core (3), the initial section and the tail end of the inclined plane of the valve core (3) are respectively provided with an inclined plane, namely, one inclined plane is designed into the combination of two inclined planes, and fillet transition is carried out at the corner joint of the inclined planes;

the inlet (1) and the outlet (4) are connected by a flange plate with 8 bolts.

2. A pressure reducing valve according to claim 1, wherein: the length of the first inclined surface (302) is 6 mm.

3. A pressure reducing valve according to claim 1, wherein: the included angle (301) formed by the first inclined surface (302) and the horizontal plane is 50 degrees.

4. A pressure reducing valve according to claim 1, wherein: the diameters of the inlet (1) and the outlet (4) are both 65 mm.