Throttling detection device
By designing the flow-in section and the back pressure section in the inner cone of the throttling detection device, slowly blocking and releasing the fluid, the problems of large pressure loss and large fluctuations in the throttling section in the prior art are solved, and higher detection accuracy and smaller fluctuations are achieved.
Patent Information
- Application Number
- CN202420836663.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-04-22
AI Technical Summary
In the prior art, the pressure loss of the fluid when it flows through the throttling part is large and fluctuates greatly, resulting in a lower detection accuracy.
A throttling detection device is designed, including a body tube, a detection assembly and an inner cone. There are flow-in sections and back pressure sections on both sides of the throttle part of the inner cone. The cone angle of the flow-in section is smaller than the cone angle of the back pressure section. The fluid is slowly blocked and released through the flow-in surface and the back pressure surface, reducing the rapid pressure-down phenomenon of the fluid at the throttle part.
It effectively reduces the permanent pressure loss of the fluid, improves detection accuracy, reduces fluid fluctuations, and realizes the rectification effect of the fluid, ensuring the accuracy of flow measurement.
Smart Images
Figure CN222652297U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of throttling equipment, and in particular to a throttling detection device. Background Art
[0002] In the petroleum, chemical, and metallurgical industries, differential pressure throttling detection devices are often used to measure the fluid flow in a pipe body. Specifically, a throttling section is set in the pipe body, and the pressure difference between the upstream and downstream sides of the throttling section is detected to calculate the flow rate based on the pressure difference.
[0003] However, in the prior art, when the fluid flows through the throttling portion, the pressure loss is large and the fluctuation is large, and the detection accuracy is low. Utility Model Content
[0004] The purpose of the present application is to provide a throttling detection device that can reduce pressure loss and improve detection accuracy while detecting the flow rate of a fluid in a pipe body.
[0005] In order to solve the above technical problems, the present application provides a throttling detection device, including a main tube, a detection component and an inner cone arranged in the main tube; the inner cone includes a throttling portion, one side end of the throttling portion gradually shrinks axially toward a side away from the throttling portion to form a head-on flow section, and the other side end of the throttling portion gradually shrinks axially toward a side away from the throttling portion to form a back-pressure section, the cone angle of the head-on flow section is smaller than the cone angle of the back-pressure section, and the inner cone is axially penetrated by a through hole; the detection component includes a first guide pipe and a second guide pipe, the inner end of the first guide pipe passes through the side wall of the main tube and is connected to the inner cavity of the main tube, the second guide pipe passes through the side wall of the main tube and is connected and fixed to one side end of the head-on flow section through the through hole through a connecting pipe, the length of the connecting pipe is 100mm-500mm, and the first guide pipe is located on the side of the second guide pipe away from the inner cone.
[0006] Optionally, the second guide tube includes a first section and a second section connected to each other in an L-shaped structure, the first section passes through a side wall of the main tube, and the second section forms at least a portion of the connecting tube.
[0007] Optionally, the inner cone also includes a flow pipe, which is integrally formed at one end of the flow section away from the back pressure section, the flow pipe is coaxially connected to the through hole, and the flow pipe is docked with the second section and circumferentially sealed and welded to form the connecting pipe.
[0008] Optionally, it further includes a fixing portion, which is respectively fixed to the back pressure section and the inner wall of the main tube.
[0009] Optionally, one end of the back pressure section away from the incoming flow section is also fixedly connected or integrally formed with a fixed tube, and the fixed tube is coaxially connected to the through hole; the fixed part includes at least two fixed rods evenly spaced along the circumferential direction, one end of the fixed rod is fixed to the outer wall of the fixed tube, and the other end of the fixed rod is fixed to the inner wall of the main tube.
[0010] Optionally, the inner cone is an integrally formed structure.
[0011] Optionally, the cone angle of the incident flow section is 45°-60°.
[0012] Optionally, the angle between the outer wall surface of the front flow section and the outer wall surface of the back pressure section is 80°-120°.
[0013] Optionally, the detection assembly further includes switch valves respectively provided on the first guide tube and the second guide tube.
[0014] Optionally, the detection assembly further includes a balancing valve respectively connected to the first guide pipe and the second guide pipe.
[0015] Compared with the prior art, the throttling detection device provided by the present application has the following technical effects:
[0016] The outer wall surface of the front flow section forms the front flow surface, and the outer wall surface of the back pressure section forms the back pressure surface. Both the front flow surface and the back pressure surface are conical surfaces, and the small diameter end of the front flow surface faces the upstream side of the fluid, and the small diameter end of the back pressure section faces the downstream side of the fluid. When the fluid flows through the main pipe, it will flow along the front flow surface to the throttling part. The outer diameter at the throttling part is the largest, and the cross-sectional area of the flow space between the outer wall of the throttling part and the inner circumferential wall of the main pipe is the smallest. The pressure of the fluid is the largest when it reaches the throttling part. After passing through the throttling part, the fluid can flow to the downstream side under the guiding action of the back pressure surface.
[0017] That is to say, when the fluid flows through the inner cone, the front surface slowly blocks the fluid and the back pressure surface slowly releases the fluid, which prevents the fluid from rapidly reducing pressure when encountering the throttling part, effectively reduces the permanent pressure loss, and achieves energy saving. At the same time, it can also reduce fluid fluctuations and rectify the fluid to ensure that the fluid flow rate is stable without too much fluctuation, so that the measured differential pressure value is more accurate, ensuring the measurement accuracy of the flow rate. At the same time, it can also reduce the length requirement of the straight pipe section, because the greater the fluctuation, the longer the straight pipe section is required to avoid the impact of the fluctuation on the detection accuracy.
[0018] The cone angle of the upstream section is smaller than that of the back pressure section, so that the axial length of the upstream section is greater than the axial length of the back pressure section. In this way, the overall length of the inner cone can be reduced. In addition, the longer the axial length of the upstream section is, the smaller the pressure loss is, the shorter the axial length of the back pressure surface is, and the more accurate the fluid pressure detection on the downstream side of the inner cone is.
[0019] The inner end of the second guide pipe is connected and fixed to the end of the oncoming section through a connecting pipe, and the length of the connecting pipe is about 100mm-500mm. Compared with the scheme of directly connecting and fixing the inner end of the connecting pipe to the end of the oncoming section, or compared with the scheme of connecting and fixing the inner end of the connecting pipe to the end of the oncoming section through a shorter connecting pipe, the distance between the second guide pipe and the oncoming section can be increased. The first guide pipe and the second guide pipe are both located on the upstream side of the inner cone. When the distance between the second guide pipe and the oncoming section increases, the airflow needs to flow through a certain length (about 100mm-500mm) after passing through the first guide pipe and the second guide pipe, and then flow along the oncoming surface to the throttling part. In this way, the influence of the disturbance caused by the blocking of the first guide pipe and the second guide pipe on the throttling effect can be avoided, the accuracy of the back pressure side pressure detection is guaranteed, and then the accuracy of the pressure difference detection is guaranteed, the detection accuracy is effectively improved, and it is conducive to achieving a higher range ratio (that is, the ratio of the maximum pressure difference to the minimum pressure difference). BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of a throttling detection device provided in an embodiment of the present application before installation;
[0021] Figure 2 yes Figure 1 Exploded view of the main tube and inner cone;
[0022] Figure 3 yes Figure 2 Schematic diagram of the structure of the inner cone;
[0023] Figure 4 yes Figure 1 A schematic diagram of the structure of the first guide tube and the second guide tube;
[0024] Figure 5 yes Figure 1 Schematic diagram of the structure of the switch valve and the balancing valve.
[0025] Attached Figure 1-Figure 5 In the figure, the reference numerals are described as follows:
[0026] 1 main pipe, 11 first perforation, 12 second perforation, 13 connecting flange;
[0027] 2 inner cone, 21 throttling portion, 22 upstream section, 221 upstream surface, 23 back pressure section, 231 back pressure surface, 24 upstream pipe, 25 fixed pipe;
[0028] 3 detection assembly, 31 first guide pipe, 32 second guide pipe, 321 first section, 322 second section, 33 switch valve, 34 balance valve;
[0029] 4Fixed part. DETAILED DESCRIPTION
[0030] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] The present application embodiment provides a throttling detection device, such as Figure 1 and Figure 2 As shown, the throttling detection device includes an inner cone 2 of a main tube 1 and a detection component 3. The inner cone 2 is located in the main tube 1 and is coaxial with the main tube 1. When the fluid flows through the main tube 1, it passes through the throttling effect of the inner cone 2, resulting in a pressure difference between the fluid on the upstream and downstream sides of the inner cone 2. The pressure difference can be detected by the detection component 3, and the fluid flow in the main tube 1 can be obtained by calculation.
[0032] The structure of the inner cone 2 is as follows Figure 3 As shown, it includes a throttling portion 21, a headflow section 22 and a backpressure section 23, wherein the headflow section 22 and the backpressure section 23 are respectively arranged on both sides of the throttling portion 21, one side end of the throttling portion 21 extends axially toward a side away from the throttling portion 21 and has a tapered structure to form the above-mentioned headflow section 22, and the other side end of the throttling portion 21 extends axially toward a side away from the throttling portion 21 and has a tapered structure to form the above-mentioned backpressure section 23. When the inner cone 2 is installed in the main pipe 1, the headflow section 22 faces the upstream side, and the backpressure section 23 faces the downstream side.
[0033] In detail, the outer wall surface of the front flow section 22 forms a front flow surface 221, and the outer wall surface of the back pressure section 23 forms a back pressure surface 231. Both the front flow surface 221 and the back pressure surface 231 are conical surfaces, and the small diameter end of the front flow surface 221 faces the upstream side of the fluid, and the small diameter end of the back pressure section 23 faces the downstream side of the fluid. When the fluid flows through the main pipe 1, it will flow along the front flow surface 221 to the throttling portion 21. The outer diameter of the throttling portion 21 is the largest, and the cross-sectional area of the flow space between the outer wall of the throttling portion 21 and the inner circumferential wall of the main pipe 1 is the smallest. The pressure of the fluid is the largest when it reaches the throttling portion 21. After passing through the throttling portion 21, the fluid can flow to the downstream side under the guiding action of the back pressure surface 231.
[0034] That is to say, when the fluid flows through the inner cone 2, the front surface 221 slowly blocks the fluid, and the back pressure surface 231 slowly releases the fluid, thereby preventing the fluid from rapidly reducing pressure when encountering the throttling portion 21, effectively reducing permanent pressure loss, and achieving energy-saving effects. At the same time, it can also reduce fluid fluctuations and have the effect of rectifying the fluid, ensuring that the fluid flow rate is stable and there are not too many fluctuations, so that the measured differential pressure value is more accurate, ensuring the measurement accuracy of the flow rate, and at the same time, it can also reduce the length requirement of the straight pipe section, because the greater the fluctuation, the longer the straight pipe section is required to avoid the impact of the fluctuation on the detection accuracy.
[0035] like Figure 1and Figure 2 As shown, both ends of the main pipe 1 are also provided with connecting flanges 13, and the straight pipe section includes at least one section of the main pipe 1. When the straight pipe section includes two or more sections of the main pipe 1, the main pipes 1 are coaxially arranged and connected and fixed by the connecting flanges 13. In the same straight pipe section, only one section of the main pipe 1 is provided with the inner cone 2.
[0036] The cone angle of the upstream section 22 is smaller than the cone angle of the back pressure section 23, so that the axial length of the upstream section 22 is greater than the axial length of the back pressure section 23. In this way, the overall length of the inner cone 2 can be reduced. In addition, the longer the axial length of the upstream section 22, the smaller the pressure loss, the shorter the axial length of the back pressure surface 231, and the more accurate the fluid pressure detection on the downstream side of the inner cone 2.
[0037] The detection assembly 3 includes a first guide tube 31 and a second guide tube 32, the inner ends of the first guide tube 31 and the second guide tube 32 respectively pass through the side wall of the main tube 1 and are respectively sealed along the circumferential direction, and the outer ends of the first guide tube 31 and the second guide tube 32 are respectively connected to the pressure detection device. The first guide tube 31 and the second guide tube 32 can respectively lead out parts of the fluid at different positions in the main tube 1, so that the pressure detection device (such as a pressure difference detection device) can detect the pressure difference of the fluid in the first guide tube 31 and the second guide tube 32.
[0038] Specifically, Figure 1 and Figure 2 As shown, the first guide pipe 31 passes through the first through hole 11 on the side wall of the main tube 1 and is connected to the inner cavity of the main tube 1, the second guide pipe 32 passes through the second through hole 12 on the side wall of the main tube 1, and is connected and fixed to one side end of the through hole toward the incoming flow section 22 through the connecting pipe, the first guide pipe 31 is located at the end of the second guide pipe 32 away from the inner cone 2, therefore, the detection component 3 detects the fluid pressure on the upstream side of the inner cone 2 through the first guide pipe 31, and since the second guide pipe 32 is connected to the through hole, the upstream end of the through hole of the inner cone 2 is blocked by the second guide pipe 32, and the downstream end of the through hole is connected to the space of the main tube 1 on the downstream side of the inner cone 2, therefore, the detection component 3 detects the fluid pressure on the downstream side of the inner cone 2 through the second guide pipe 32.
[0039] The pressure difference between the upstream side and the downstream side of the inner cone 2 in the main tube 1 can be detected by the pressure detection device, the first guide tube 31 and the second guide tube 32, and the flow rate of the fluid flowing through the main tube 1 can be calculated based on the pressure difference and the relationship corresponding to the inner cone 2. Specifically, in this embodiment, there is no restriction on the relationship, and after the inner cone 2 and the main tube 1 are installed and matched, the relationship can be measured by experiment.
[0040] The second guide tube 32 is connected and fixed to the upstream end of the inner cone 2 through a connecting tube. At the same time, the second guide tube 32 is also fixed to the side wall of the main tube 1. Therefore, the front end of the inner cone 2 can be fixed to the main tube 1 through the second guide tube 32 to ensure the stability of the inner cone 2 in the main tube 1.
[0041] Specifically, the inner end of the second guide pipe 32 is connected and fixed to the end of the oncoming flow section 22 through a connecting pipe, and the length of the connecting pipe is about 100 mm-500 mm. Compared with the solution of directly connecting and fixing the inner end of the connecting pipe to the end of the oncoming flow section 22, or connecting and fixing the end of the oncoming flow section 22 through a shorter connecting pipe, the distance between the second guide pipe 32 and the oncoming flow section 22 can be increased. The first guide pipe 31 and the second guide pipe 32 are both located on the upstream side of the inner cone 2. When the distance between the second guide pipe 32 and the oncoming flow section 22 is After the spacing between the first and second guide pipes 31 and 32 increases, the airflow needs to flow through a certain length (about 100mm-500mm) after passing through the first guide pipe 31 and the second guide pipe 32, and then flow to the throttling portion 21 along the front face 221. In this way, the influence of the disturbance caused by the fluid blocking by the first and second guide pipes 31 and 32 on the throttling effect can be avoided, the accuracy of the back pressure side pressure detection is ensured, and then the accuracy of the pressure difference detection is ensured, the detection accuracy is effectively improved and it is conducive to achieving a higher range ratio (that is, the ratio of the maximum pressure difference to the minimum pressure difference).
[0042] like Figure 4 As shown, the second guide tube 32 is in an L-shaped structure, specifically including a first section 321 and a second section 322. The end of the second section 322 away from the inner cone 2 is connected and fixed to the inner end of the second section 322, and the second section 322 forms at least part of the above-mentioned connecting tube. The second guide tube 32 is arranged through the side wall of the main tube 1. Therefore, when the second guide tube 32 is directly arranged in an L-shaped structure, it is convenient to connect and fix, and the coaxiality of the inner cone 2 and the main tube 1 can be ensured.
[0043] It should be noted that, herein, for the first guide tube 31 and the second guide tube 32, the "inner end" refers to the end facing the main tube 1, and the "outer end" refers to the end located outside the main tube 1.
[0044] In this embodiment, there is no limitation on the specific structure of the connecting pipe. For example, the end of the second section 322 can be directly sealed and welded to the end of the inflow section 22, or it can be as follows: Figure 3As shown, the inner cone 2 also includes a flow pipe 24, which is integrally formed at one end of the flow section 22 away from the back pressure section 23, and the flow pipe 24 is coaxially connected to the through hole, and the flow pipe 24 is butted with the second section 322 and sealed and welded along the circumferential direction to form the above-mentioned connecting pipe. The flow pipe 24 is integrally formed with the flow section 22 to simplify the processing technology, and the flow pipe 24 is butted with the second section 322 and fixed by welding or the like, which facilitates the welding operation.
[0045] like Figure 2 As shown, the throttling detection device also includes a fixing portion 4, which is respectively fixed to the back pressure section 23 and the inner wall of the main tube 1, that is, the end of the upstream side of the inner cone 2 is fixed to the main tube 1 through the second guide tube 32, and the end of the downstream side of the inner cone 2 is fixed to the main tube 1 through the fixing portion 4. Such an arrangement can ensure the fixing stability of the inner cone 2 in the main tube 1.
[0046] like Figure 3 As shown, the end of the back pressure section 23 away from the incoming flow section 22 is also fixedly connected or integrally formed with a fixed tube 25, and the fixed tube 25 is coaxially connected to the through hole, and the fixed part 4 includes at least two fixed rods arranged evenly spaced along the circumference, one end of the fixed rod is fixed to the outer wall of the fixed tube 25, and the other end of the fixed rod is fixed to the inner wall of the main body tube 1. The axial cross-sectional area of the fixed rod is small, and such a setting can reduce the obstruction caused by the flow of the fluid in the fixed part 4, thereby reducing the influence of the fixed part 4 on the pressure detection result of the pressure test, and ensuring the accuracy of the detection result.
[0047] Furthermore, the distance between the fixing portion 4 and the downstream end surface of the main pipe 1 is preferably set within 80 mm.
[0048] In this embodiment, the inner cone 2 is an integrally formed structure, that is, the above-mentioned headstream section 22, back pressure section 23, headstream pipe 24 and fixed pipe 25 are all integrally formed structures, and are processed along the axial direction to form the above-mentioned through hole, so that the processing technology can be simplified. Specifically, the through hole in the inner cone 2 can be a cylindrical hole, or it can be a structure of unequal diameter, that is, the thickness of the side wall of the through hole at different positions in the axial direction is different, which can be specifically set according to the specific position, so that the overall weight can be reduced.
[0049] Of course, in this embodiment, the headflow section 22 and the back pressure section 23 of the inner cone 2 can also be set as independent structures and fixed by welding. Specifically, the large diameter end of the headflow section 22 and the large diameter end of the back pressure section 23 are connected and welded to form the above-mentioned throttling portion 21 here.
[0050] like Figure 3As shown, the cone angle β of the oncoming section 22 is 45°-60°, preferably 50°. If the cone angle β of the oncoming section 22 is too large, the pressure loss generated is also greater. If the cone angle β of the oncoming section 22 is too small, the guiding effect of the oncoming surface 221 is better and the pressure loss is smaller, but the length of the oncoming section 22 will also be larger, and the installation space requirement is higher. In this embodiment, the cone angle of the back pressure section 23 is greater than the cone angle β of the oncoming section 22, and the specific size of the cone angle of the back pressure section 23 is not limited.
[0051] The angle α between the upstream surface 221 and the back pressure surface 231 is 80°-120°, preferably 90°. When the cone angle β of the upstream section 22 is constant, the larger the angle α, the longer the length of the back pressure section 23, the longer the distance between the throttling portion 21 and the downstream end of the through hole, and the smaller the pressure drop on the upstream and downstream sides of the inner cone 2, which is not conducive to the accuracy of the detection results. The smaller the angle α, the weaker the rectifying effect. Therefore, when the angle α is set to 80°-120°, it can ensure both the rectifying effect of the cone and the larger pressure drop, thereby ensuring the accuracy of the detection results.
[0052] The detection component 3 also includes a switch valve 33 respectively arranged on the first guide tube 31 and the second guide tube 32. During the inspection process, the detection component 3 does not need to perform inspection operations. At this time, the switch valve 33 can be closed to prevent the fluid in the main tube 1 from flowing out along the first guide tube 31 and the second guide tube 32.
[0053] The detection assembly 3 also includes a balancing valve 34 which is connected to the first guide pipe 31 and the second guide pipe 32 respectively. When the balancing valve 34 is opened, the first guide pipe 31 and the second guide pipe 32 are connected, and the pressure on the upstream side and the downstream side of the inner cone 2 is balanced. The balancing valve 34 can be used to zero the throttling detection device before use after installation, or it can be zeroed after a period of use to ensure the accuracy of the detection result.
[0054] Specifically, in this embodiment, there is no limitation on the specific structures of the switch valve 33 and the balance valve 34. For example, a three-valve group can be used, and the overall structure is simple.
[0055] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.
Claims
1. A throttling detection device, characterized in that: It comprises a main body tube (1), a detection component (3), and an inner cone (2) arranged in the main body tube (1); The inner cone (2) comprises a throttling portion (21), one side end of the throttling portion (21) gradually contracts along the axial direction toward a side away from the throttling portion (21) to form a headflow section (22), the other side end of the throttling portion (21) gradually contracts along the axial direction toward a side away from the throttling portion (21) to form a backpressure section (23), the cone angle of the headflow section (22) is smaller than the cone angle of the backpressure section (23), and a through hole is axially penetrated by the inner cone (2); The detection assembly (3) comprises a first guide tube (31) and a second guide tube (32); the inner end of the first guide tube (31) passes through the side wall of the main tube (1) and is connected to the inner cavity of the main tube (1); the second guide tube (32) passes through the side wall of the main tube (1) and is connected and fixed to one side end of the through hole facing the flow section (22) through a connecting tube; the length of the connecting tube is 100 mm to 500 mm; the first guide tube (31) is located on a side of the second guide tube (32) away from the inner cone (2).
2. The throttling detection device according to claim 1, characterized in that: The second guide tube (32) comprises a first section (321) and a second section (322) which are connected and arranged in an L-shaped structure, the first section (321) passing through the side wall of the main tube (1), and the second section (322) forming at least a part of the connecting tube.
3. The throttling detection device according to claim 2, characterized in that: The inner cone (2) further comprises a flow pipe (24), the flow pipe (24) being integrally formed at one end of the flow section (22) away from the back pressure section (23), the flow pipe (24) being coaxially connected to the through hole, the flow pipe (24) being butt-jointed with the second section (322) and being sealed and welded along the circumferential direction to form the connecting pipe.
4. The throttling detection device according to any one of claims 1 to 3, characterized in that: It also comprises a fixing portion (4), wherein the fixing portion (4) is respectively fixed to the back pressure section (23) and the inner wall of the main body tube (1).
5. The throttling detection device according to claim 4, characterized in that: One end of the back pressure section (23) away from the incoming flow section (22) is also fixedly connected or integrally formed with a fixed pipe (25), and the fixed pipe (25) is coaxially connected to the through hole; The fixing portion (4) comprises at least two fixing rods arranged at even intervals along the circumferential direction, one end of each fixing rod being fixed to the outer wall of the fixing tube (25), and the other end of each fixing rod being fixed to the inner wall of the main body tube (1).
6. The throttling detection device according to any one of claims 1 to 3, characterized in that: The inner cone (2) is an integrally formed structure.
7. The throttling detection device according to any one of claims 1 to 3, characterized in that: The cone angle of the incident flow section (22) is 45°-60°.
8. The throttling detection device according to claim 7, characterized in that: The included angle between the outer wall surface of the front flow section (22) and the outer wall surface of the back pressure section (23) is 80°-120°.
9. The throttling detection device according to any one of claims 1 to 3, characterized in that: The detection assembly (3) further comprises switch valves (33) respectively arranged on the first guide tube (31) and the second guide tube (32).
10. The throttling detection device according to claim 9, characterized in that: The detection assembly (3) further comprises a balancing valve (34) respectively connected to the first guide tube (31) and the second guide tube (32).