Angle valve with bias flow restraining shrinkage pipe and design method of angle valve

Abstract

The angle valve comprises a shell, an overflowing channel is formed in the shell, a water inlet and a water outlet which are communicated with the overflowing channel are formed in the shell, a throat section is arranged in the direction, corresponding to the water outlet, of the overflowing channel, and a multi-stage expansion pipe section is arranged on the downstream portion, corresponding to the throat section, of the overflowing channel; the water outlet is positioned at the tail end of the multi-stage expansion pipe section; the valve element is movably connected to the shell and opens and closes the throat section. The control part is connected with the valve core and promotes the valve core to open and close the throat section; the special-shaped pipe is provided with a contraction section and an expansion section, the special-shaped pipe is fixedly located in the upstream first-stage expansion pipe section and fixedly connected with the throat section, water in the throat section is converged through the center of the contraction section and then enters the expansion section and the downstream expansion pipe section, and when the special-shaped pipe in the angle valve is designed, the expansion angle and the expansion curvature need to be considered. And the service life of the valve can be prolonged by optimizing the structure of the valve body and the erosion protection measures.

Description

Technical Field

[0001] The invention belongs to the technical field of valve devices, and in particular relates to an angle valve with a contraction tube for suppressing bias flow and a design method thereof. Background Art

[0002] Valves play an indispensable role in many key industries such as petroleum, chemical industry, electric power, long-distance pipelines, shipbuilding, nuclear energy, aerospace, and offshore oil extraction. They mainly undertake core functions such as controlling fluid flow, regulating pressure, preventing leakage, and realizing switch operation. Among them, angle valves have attracted much attention due to their unique structural advantages, including small flow resistance, low leakage, and strong durability. Especially when dealing with high pressure difference, high viscosity liquid and media containing solid particles or suspended matter, angle valves perform well. Its design effectively reduces the risk of coking and clogging, and is easy to clean and maintain. Therefore, it is widely used in the design of various stop valves, throttle valves, check valves, safety valves and pressure reducing valves, and occupies an important position.

[0003] However, in fields that require high-pressure operations, such as petroleum, coal chemical industry, aerospace and nuclear energy, valves often need to face extreme working conditions. After a period of use, the Venturi expansion area on the opposite side of the high-pressure angle valve inlet usually suffers from severe lateral erosion. This erosion may cause the valve body to be partially weakened or penetrated, thus affecting the overall performance and operational safety of the equipment. As the valve body becomes more damaged, the entire valve assembly usually needs to be replaced, which not only significantly increases maintenance and replacement costs, but also may bring potential safety hazards.

[0004] Therefore, how to provide an angle valve with a shrink tube that suppresses bias flow to extend the service life of the valve is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides an angle valve with a contraction tube that suppresses bias flow, and adopts a flow control method to reduce the bias flow erosion problem inside the high-pressure angle valve. By optimizing the valve body structure and erosion protection measures, the problem of lateral erosion and wear of the expansion section caused by eccentric water of the high-pressure angle valve can be effectively improved, thereby increasing the service life of the valve.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: an angle valve with a contraction tube for suppressing bias flow, comprising:

[0007] A shell, wherein a flow passage is provided inside the shell, a water inlet and a water outlet connected to the flow passage are provided on the shell, a throat section is provided in the flow passage in the direction corresponding to the water outlet, a multi-stage expansion pipe section is provided downstream of the flow passage corresponding to the throat section, and the water outlet is located at the tail end of the multi-stage expansion pipe section;

[0008] A valve core, the valve core is movably connected to the housing and opens and closes the throat section;

[0009] A control unit, the control unit is connected to the valve core and prompts the valve core to open and close the throat section;

[0010] A special-shaped pipe is provided with a contraction section and an expansion section. The special-shaped pipe is fixedly located inside the upstream first-level expansion pipe section and fixedly connected to the throat section. The water in the throat section converges through the center of the contraction section and enters the expansion section and the downstream expansion pipe section.

[0011] The beneficial effect of the present invention is as follows: compared with the traditional angle valve, the present invention arranges a special-shaped pipe on the inner side of the upstream first-level expansion pipe section, and the water body directly enters the special-shaped pipe through the throat section. The flow of the water body is controlled by the contraction section of the special-shaped pipe to converge at the center, thereby avoiding the separation of the water body on the wall of the first-level expansion pipe. Fluid separation usually occurs in the area where the wall pressure gradient turns from negative to positive. The adverse pressure gradient will cause the boundary layer flow velocity to decrease or even flow back, thereby inducing vortices. The special-shaped pipe designed in the present invention is used in conjunction with an angle valve to inhibit the occurrence of fluid separation and reduce the eccentric flow erosion of the inner wall of the angle valve by the water body. The present invention is simple to manufacture and low in cost, and can effectively improve the problem of lateral erosion and wear of the expansion section caused by eccentric water of the high-pressure angle valve, thereby increasing the service life of the valve.

[0012] Preferably, the contraction section and expansion section of the special-shaped tube are arranged continuously, the contraction section of the special-shaped tube corresponds to the upstream of the water body, and the expansion section corresponds to the downstream of the water body, and the inlet end diameter of the contraction section is consistent with the inlet port diameter of the first-level expansion pipe section and the caliber of the throat section.

[0013] The resulting technical effect is that the contraction section of the special-shaped pipe is directly connected to the throat section, that is, the water in the throat section directly enters the contraction section of the special-shaped pipe and controls the flow state of the water, causing it to gather toward the center and change the flow field, thereby avoiding the problem of erosion and damage to the downstream angle valve by the water.

[0014] Preferably, the ratio of the axial height dimension of the special-shaped tube to the inlet port diameter dimension of the first-stage expansion tube section is 2:3.

[0015] Preferably, the contraction angle value of the contraction section is twice the expansion angle value of the first-stage expansion tube section.

[0016] The resulting technical effect is: this design reduces the adverse pressure gradient near the tube wall by precisely controlling the expansion angle and expansion curvature, thereby inhibiting the occurrence of fluid separation. This structural optimization enhances the stability of the tube wall boundary layer and helps to achieve a smooth transition of the flow field. The velocity gradient of the fluid at the outlet of the profiled tube is minimized, thereby improving the uniformity of the velocity distribution. This feature not only improves the fluid transportation efficiency, but also reduces the energy loss caused by turbulence. The flow direction of the fluid tends to be parallel when passing through the outlet section of the profiled tube, which can effectively reduce the influence of the radial velocity component. The formation of a parallel flow field helps to optimize the fluid dynamics of downstream equipment and reduce energy loss or equipment wear caused by fluid impact. Ultimately, the adverse effects of eccentric water bodies on the flow field can be effectively reduced by improving the symmetry of the profiled tube flow channel and the uniformity of the velocity field.

[0017] A design method of an angle valve with a contraction tube for suppressing bias flow comprises the following steps:

[0018] Step 1: Select the target model angle valve to be used, and obtain the inlet port diameter size of the first-level expansion pipe section inside the target model angle valve;

[0019] Step 2: configuring a special-shaped tube, the special-shaped tube is a Venturi tube structure, the ratio of the axial height of the special-shaped tube to the inlet port diameter of the first-stage expansion pipe section is 2:3, and the contraction angle of the contraction section of the special-shaped tube is twice the deflection angle of the first-stage expansion pipe section;

[0020] Step 3: The special-shaped tube is fixedly connected to the target model angle valve, the contraction section of the special-shaped tube is fixed to the throat section end of the target model angle valve, and the special-shaped tube is ensured to be located inside the first-stage expansion pipe section.

[0021] Preferably, in the step 2, the special-shaped tube is configured based on a straight inward-retracted section, a straight transition section and a straight outward-expanding section. On the axial cross-section, the intersection between the inward-retracted section and the transition section is the first inflection point, the intersection between the transition section and the outward-expanding section is the second inflection point, the inward-retracted angle of the inward-retracted section is twice the deflection angle of the primary expansion tube section, the profile length of the inward-retracted section is half of the axial length of the special-shaped tube, the transition section is a tube section of equal diameter, the second inflection point is located at 3 / 4 of the axial length of the special-shaped tube, and the axial dimension of the outward-expanding section is 1 / 4 of the axial dimension of the special-shaped tube.

[0022] Preferably, the two outer end points of the inward-contracting section and the outward-expanding section cooperate with the first inflection point and the second inflection point to generate a characteristic line controlled by four characteristic points, namely point A, point B, point C, and point D. Point A is the starting point of the characteristic line, point B is the first inflection point, point C is the second inflection point, and point D is the end point of the characteristic line. The Bezier function is used to approximate the characteristic line, thereby obtaining a Bezier curve, that is, the profile of the wall of the special-shaped tube.

[0023] The beneficial effects of the present invention are as follows: there are certain requirements for the design of the inner surface of the special-shaped tube, the surface is formed by the rotation of the profile line, the design of the profile line is based on a characteristic line composed of four characteristic points, and the Bezier function is used, with point A and point D as the two end points and point B and point C as the control points to approximate the characteristic line, thereby obtaining a Bezier curve, that is, the profile line of the contraction tube wall. The design reduces the adverse pressure gradient near the tube wall by accurately controlling the expansion angle and the expansion curvature, thereby inhibiting the occurrence of fluid separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of an angle valve with a contraction tube for suppressing bias flow according to the present invention;

[0025] Figure 2 It is a schematic diagram of the installation of a special-shaped pipe of an angle valve with a shrinkage pipe for suppressing bias flow according to the present invention;

[0026] Figure 3 This is a design drawing of a special-shaped tube of an angle valve with a shrinkage tube for suppressing bias flow according to the present invention;

[0027] Figure 4 Schematic diagram of velocity distribution and local streamlines in the flow field of a traditional angle valve.

[0028] 1 shell, 11 water inlet, 12 water outlet, 13 throat section, 14 primary expansion pipe section, 2 valve core, 3 control part, 4 special-shaped pipe, 41 contraction section, 42 expansion section. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See the attached Figures 1 to 4 According to an embodiment of the present invention, an angle valve with a contraction tube for suppressing bias flow comprises:

[0031] A shell 1, wherein a flow passage is provided inside the shell 1, a water inlet 11 and a water outlet 12 connected to the flow passage are provided on the shell 1, a throat section 13 is provided in the flow passage corresponding to the direction of the water outlet 12, a multi-stage expansion pipe section is provided downstream of the flow passage corresponding to the throat section 13, and the water outlet 12 is located at the tail end of the multi-stage expansion pipe section;

[0032] The valve core 2 is movably connected to the housing 1 and opens and closes the throat section 13;

[0033] The control part 3 is fixedly connected to the valve core 2 and causes the valve core 2 to open and close the throat section 13. It can be understood that the control part is actually a control component that controls the axial movement of the valve core and opens and closes the throat section, which can be a manual component or an electric component;

[0034] The special-shaped pipe 4 is provided with a contraction section 41 and an expansion section 42. The special-shaped pipe 4 is fixedly located inside the upstream first-level expansion pipe section 14 and is fixedly connected to the throat section 13. The water in the throat section 13 enters the expansion section 42 and the downstream expansion pipe section after being contracted by the contraction section 41. The contraction section can make the water gather toward the center to avoid the separation of the water on the wall of the first-level expansion pipe.

[0035] In other embodiments, the contraction section 41 and the expansion section 42 of the special-shaped tube 4 are arranged continuously, the contraction section 41 of the special-shaped tube 4 corresponds to the upstream of the water body, and the expansion section corresponds to the downstream of the water body, and the inlet end diameter size of the contraction section 41 is consistent with the inlet port diameter size of the first-level expansion pipe section 14 and the caliber size of the throat section 13.

[0036] In some other specific embodiments, the ratio of the axial height dimension of the special-shaped tube 4 to the inlet port diameter dimension of the first-stage expansion tube section 14 is 2:3.

[0037] In some other specific embodiments, the contraction angle value of the contraction section 41 is twice the expansion angle value of the first-stage expansion tube section 14 .

[0038] The present invention also discloses a design method of an angle valve with a contraction tube for suppressing bias flow, which comprises the following steps:

[0039] Step 1: Select the target model angle valve to be used, and obtain the inlet port diameter size of the first-level expansion pipe section inside the target model angle valve;

[0040] Step 2: configuring a special-shaped tube, the special-shaped tube is a Venturi tube structure, the ratio of the axial height of the special-shaped tube to the diameter of the inlet port of the first-stage expansion tube is 2:3, and the contraction angle of the contraction section of the special-shaped tube is twice the deflection angle of the first-stage expansion tube;

[0041] Step 3: The special-shaped tube is fixedly connected to the target model angle valve, the contraction section of the special-shaped tube is fixed to the throat section end of the target model angle valve, and the special-shaped tube is located on the inner side of the first-stage expansion tube.

[0042] In step 2, the special-shaped tube is configured based on a straight inward-retracted section, a straight transition section and a straight outward-expanding section. On the axial cross-section, the intersection between the inward-retracted section and the transition section is the first inflection point, and the intersection between the transition section and the outward-expanding section is the second inflection point. The inward-retracted angle of the inward-retracted section is twice the deflection angle of the primary expansion section. The length of the inward-retracted section is half of the axial length of the special-shaped tube. The transition section is an equal-diameter tube section. The second inflection point is located at 3 / 4 of the axial length of the special-shaped tube, and the axial dimension of the outward-expanding section is 1 / 4 of the axial dimension of the special-shaped tube.

[0043] The two outer end points of the shrinking section and the expanding section cooperate with the first inflection point and the second inflection point to generate a characteristic line controlled by four characteristic points, namely point A, point B, point C, and point D. Point A is the starting point of the characteristic line, point B is the first inflection point, point C is the second inflection point, and point D is the end point of the characteristic line. The Bezier function is used to approximate the characteristic line to obtain the Bezier curve, that is, the profile of the wall of the special-shaped tube.

[0044] The Bezier function is as follows:

[0045]

[0046] In the specific design, the special-shaped tube runs from the entrance of the first-stage expansion tube section to the inner side of the wall at a contraction angle to 1 / 2 of the height of the special-shaped tube, runs to 3 / 4 of the height of the special-shaped tube at a vertical distance, and finally runs to the outer side of the wall at a contraction angle to 1 / 4 of the height of the special-shaped tube, generating a characteristic line controlled by four points A, B, C, and D. The Bezier function is used to approximate the characteristic line, thereby obtaining the Bezier curve, that is, the profile of the shrinking tube wall.

[0047] Specific application example: The inlet diameter of the contraction section of the angle valve special-shaped tube is 52mm, so the height of the contraction tube is 34.6mm; the deflection angle of the first-stage expansion tube is 7.3°, so the contraction angle of the contraction tube is 14.6°. The Bezier function is used to approximate the characteristic polygon to obtain the Bezier curve, that is, the profile of the contraction tube wall.

[0048] As for the device and the method of use disclosed in the embodiment, since they correspond to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0049] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An angle valve with a contraction tube for suppressing bias flow, characterized in that: include: A shell (1), wherein a flow passage is provided inside the shell (1), a water inlet (11) and a water outlet (12) which are connected to the flow passage are provided on the shell (1), a throat section (13) is provided in the flow passage in a direction corresponding to the water outlet (12), a multi-stage expansion pipe section is provided downstream of the flow passage corresponding to the throat section (13), and the water outlet (12) is located at the tail end of the multi-stage expansion pipe section; A valve core (2), the valve core (2) being movably connected to the housing (1) and opening and closing the throat section (13); A control unit (3), the control unit (3) being connected to the valve core (2) and prompting the valve core (2) to open and close the throat section (13); A special-shaped pipe (4), wherein the special-shaped pipe (4) is provided with a contraction section (41) and an expansion section (42), wherein the special-shaped pipe (4) is fixedly located inside an upstream primary expansion pipe section (14) and is fixedly connected to the throat section (13), wherein water in the throat section (13) converges at the center of the contraction section (41) and then enters the expansion section (42) and the downstream expansion pipe section, and the flow direction of the water tends to be parallel when flowing out of the outlet of the expansion section.

2. An angle valve with a contraction tube for suppressing bias flow according to claim 1, characterized in that: The contraction section (41) and the expansion section (42) of the special-shaped pipe (4) are arranged continuously. The contraction section (41) of the special-shaped pipe (4) corresponds to the upstream of the water body, and the expansion section corresponds to the downstream of the water body. The diameter size of the inlet end of the contraction section (41) is consistent with the diameter size of the inlet port of the first-stage expansion pipe section (14) and the diameter size of the throat section (13).

3. An angle valve with a contraction tube for suppressing bias flow according to claim 1, characterized in that: The ratio of the axial height dimension of the special-shaped tube (4) to the inlet port diameter dimension of the first-stage expansion tube section (14) is 2:

3.

4. An angle valve with a contraction tube for suppressing bias flow according to claim 1, characterized in that: The contraction angle value of the contraction section (41) is twice the expansion angle value of the first-stage expansion tube section (14).

5. A design method for an angle valve with a contraction tube for suppressing bias flow, characterized in that: The following steps are involved: Step 1: Select the target model angle valve to be used, and obtain the inlet port diameter size of the first-level expansion pipe section inside the target model angle valve; Step 2: configuring a special-shaped tube, the special-shaped tube is a Venturi tube structure, the ratio of the axial height of the special-shaped tube to the inlet port diameter of the first-stage expansion pipe section is 2:3, and the contraction angle of the contraction section of the special-shaped tube is twice the deflection angle of the first-stage expansion pipe section; Step 3: The special-shaped tube is fixedly connected to the target model angle valve, the contraction section of the special-shaped tube is fixed to the throat section end of the target model angle valve, and the special-shaped tube is ensured to be located inside the first-stage expansion pipe section.

6. A design method for an angle valve with a contraction tube for suppressing bias flow according to claim 5, characterized in that: In the step 2, the special-shaped tube is configured based on a straight inward-retracted section, a straight transition section and a straight outward-expanded section. On the axial cross section, the intersection between the inward-retracted section and the transition section is the first inflection point, the intersection between the transition section and the outward-expanded section is the second inflection point, the inward-retracted angle of the inward-retracted section is twice the deflection angle of the primary expansion tube section, the profile length of the inward-retracted section is half of the axial length of the special-shaped tube, the transition section is a tube section of equal diameter, the second inflection point is located at 3 / 4 of the axial length of the special-shaped tube, and the axial dimension of the outward-expanded section is 1 / 4 of the axial dimension of the special-shaped tube.

7. A design method for an angle valve with a contraction tube for suppressing bias flow according to claim 6, characterized in that: The two outer end points of the shrinking section and the expanding section cooperate with the first inflection point and the second inflection point to generate a characteristic line controlled by four characteristic points, namely point A, point B, point C, and point D. Point A is the starting point of the characteristic line, point B is the first inflection point, point C is the second inflection point, and point D is the end point of the characteristic line. The Bezier function is used to approximate the characteristic line to obtain the Bezier curve, that is, the profile of the wall of the special-shaped tube.

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