A steam flow detection device with pressure compensation metering

Abstract

The present invention discloses a steam flow detection device with pressure compensation metering, which relates to the technical field of fluid flow detection. The detection device includes a shell and a detection pipeline. A panel is installed on the shell, and the detection pipeline is installed in the shell. A docking mechanism is installed at both ends of the detection pipeline inside the shell. The docking mechanism connects the steam pipeline with the detection pipeline. A control box is arranged on the back of the panel. The control box is connected to multiple pressure sensors on the detection pipeline. The control box monitors and calculates the pressure in the detection pipeline, and displays the calculated steam flow on the panel. The steam flow can be seen in real time through the panel. One of the pressure sensors is used to collect the stable steam pressure upstream of the detection pipeline, so that the control box can calculate the steam density, and the obtained steam density is used to effectively perform pressure compensation, thereby improving the steam flow detection accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of fluid flow detection, in particular to a steam flow detection device with pressure compensation metering. Background Art

[0002] The steam flow detection process is an important link in the industrial field. It ensures the control and efficiency of the production process by measuring the flow state of steam in the pipeline. The steam flow detection device is an important tool for measuring steam flow. The most common ones are flow meters based on the differential pressure principle, such as orifice flow meters, venturi flow meters, etc. These flow meters calculate the flow rate by measuring the pressure difference before and after the steam flows through the throttling device, combined with the density of the steam (determined by temperature and pressure). In addition, there are steam flow detection equipment based on other principles such as turbine flow meters.

[0003] When an existing steam flow detection device is connected to a steam pipeline, it is necessary to manually connect the flange of the steam flow detection device to the flange of the steam pipeline through bolts and nuts. The whole process is time-consuming and labor-intensive. In addition, when the steam flow detection device displays the steam flow, it is affected by the layout of the steam pipeline and the steam flow detection device needs to be installed on a vertical steam pipeline. This makes it extremely inconvenient to observe the value displayed on the steam flow detection device. Summary of the invention

[0004] The object of the present invention is to provide a steam flow detection device with pressure compensation metering to solve the problems raised in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a steam flow detection device with pressure compensation metering, comprising a detection pipeline and a shell, the detection pipeline is composed of a detection tube and a venturi tube, the venturi tube is connected in series to the detection tube, a pressure sensor is arranged in the middle of the detection tube in front of the inlet of the venturi tube, and pressure sensors are installed at the inlet and the contraction of the venturi tube. The detection pipeline is installed in the shell, and docking mechanisms are installed at both ends of the detection pipeline inside the shell, and docking ports are arranged at both ends of the shell. The external steam pipeline passes through the docking ports, and the docking mechanism connects the detection pipeline with the external steam pipeline. A panel is rotatably arranged on the shell, and a control box is arranged on the back of the panel, and the control box is connected to the pressure sensor. Since the density of steam changes with the change of pressure, pressure compensation must be performed when measuring steam flow, and pressure compensation is used to correct the change of steam state caused by pressure change. By measuring the pressure of steam and inputting it into the control box, accurate temperature and pressure compensation can be achieved, thereby improving the accuracy of flow measurement. The pressure sensor installed on the detection tube (not shown in the figure) is the pressure sensor located upstream of the Venturi tube. The pressure sensor in the detection tube detects the smoothly flowing steam, makes pressure compensation for the subsequent detection of steam flow, and improves the detection accuracy of steam flow. A pressure sensor (not shown in the figure) is installed at the inlet and contraction of the Venturi tube respectively. The control box calculates the pressure values ​​transmitted by the two pressure sensors on the Venturi tube and finally calculates the steam flow. The docking mechanism enables the steam pipe to dock with the detection tube quickly and ensures that there is no relative rotation between the steam pipe and the detection tube, eliminating the steps of manual installation and saving the installation time wasted by bolt and nut connection.

[0006] A turntable is installed on the outside of the panel, the control box is eccentrically installed on the back of the turntable, a through slot is provided on the housing at a position corresponding to the turntable, and the turntable is rotatably installed on the through slot. The control box is eccentrically installed on the back of the turntable, and the weight of the control box is used to drive the turntable to rotate on the housing, so that the panel is kept vertical to the ground, so that the staff can normally view the content displayed on the panel without having to turn their heads to view due to the pipeline layout of the steam pipeline.

[0007] A flange is provided at one end of the detection tube away from the venturi tube, and the detection tube is installed inside the shell through a support;

[0008] The docking mechanism includes a hydraulic ring sleeved on the outside of the detection tube, a sleeve inserted in the bolt hole of the flange, a vertical plate installed inside the shell, one end of the vertical plate is installed on the detection tube and located between the flange and the support, a hollow compression rod is slidably installed inside the sleeve, one end of the compression rod passes through the vertical plate and communicates with the inside of the hydraulic ring, a support spring is sleeved on the compression rod, one end of the support spring is against one end of the sleeve, and the other end of the support spring is against the vertical plate, a "U"-shaped tube is installed at each of the upper and lower ends of the hydraulic ring, an expansion bag is connected in series in the middle of the "U"-shaped tube, and a clamping cylinder is vertically installed at one end of the "U"-shaped tube, hydraulic oil is provided inside the sleeve, compression rod, hydraulic ring, "U"-shaped tube, expansion bag and clamping cylinder, a semi-circular clamping sleeve is installed at the output end of the clamping cylinder, one end of the clamping sleeve is slidably connected to the inner wall of the shell, and the clamping sleeve is located on the inner side of the docking port. The support fixes the detection tube in the shell.

[0009] A plug-in column is arranged at one end of the sleeve away from the supporting spring. The diameter of the plug-in column is the same as the bolt hole diameter of the flange on the steam pipe, and the diameter of the plug-in column is smaller than the diameter of the sleeve.

[0010] A collar is installed at one end of the expansion bag, a bottom tube is provided at one end of the collar, a carrier plate is installed at one end of the bottom tube, and one end of the carrier plate is fixed to the inner wall of the shell. A limiting spring is provided inside the expansion bag, and the inner space of the collar and the inner space of the bottom tube are both connected to the inner space of the expansion bag, and the "U"-shaped tube is connected to the inner space of the collar. When the steam pipe is docked with the detection tube, the steam pipe is squeezed into the shell from the docking port, and the plug-in column is inserted into the bolt hole on the steam pipe to prevent relative rotation between the steam pipe and the detection tube. The sleeve is against the flange of the steam pipe. As the steam pipe continues to enter the shell, the steam pipe moves toward the vertical plate against the sleeve. As the sleeve moves on the compression rod, the hydraulic oil in the sleeve is squeezed into the hydraulic ring and finally enters the clamping cylinder through the "U"-shaped tube. During the entry of the steam pipe, the flange of the steam pipe will hinder the radial movement of the ferrule, and then when the ferrule fits on the steam pipe After the flange of the steam pipe is moved out of the ferrule, the clamping cylinder will no longer stretch; when the sleeve is continuously compressed and the clamping cylinder no longer stretches, the hydraulic oil is temporarily stored in the expansion bag, and the expansion bag expands to adapt to the increase of hydraulic oil. Under the support of the limiting spring, the expansion bag can only expand axially but not radially; when the flange of the steam pipe is moved out of the ferrule, the hydraulic oil in the expansion bag is squeezed into the clamping cylinder under the contraction of the expansion bag and the limiting spring, so that the clamping cylinder stretches again, so that the ferrule is between the shell and the flange of the steam pipe, and the ferrule resists the flange of the steam pipe to prevent the steam pipe from detaching from the shell.

[0011] A cylinder is arranged inside the bottom cylinder, and a micro air pump is arranged on the carrier plate, and the micro air pump is connected to the cylinder pipeline. When the steam pipeline is separated from the detection tube, the micro air pump works under the control of the control box, and injects air into the cylinder to stretch the cylinder and use the support plate to stretch the expansion bag, so that the expansion bag expands and generates low pressure. The external air pressure acts on the ferrule, so that the clamping cylinder contracts and squeezes the hydraulic oil inside itself into the expansion bag. When the ferrule is no longer in contact with the flange of the steam pipeline, the steam pipeline can be pulled out of the docking port. After the extrusion of the steam pipeline is lost, the support spring pushes the sleeve back to its original position. In this process, the cylinder contracts rapidly. Under the pull of the limiting spring and the contraction of the expansion bag, the hydraulic oil in the expansion bag flows back and enters the sleeve again.

[0012] The upper end surface of the shell is provided with a groove, and the shell is provided with a through hole passing through the groove. The other end of the expansion bag is provided with a support plate, and a striker is provided on the support plate. One end of the striker is inserted in the through hole and is installed with a striker plate, and the striker plate is located in the groove. The groove is used to place the striker plate. When the expansion bag expands axially, the support plate pushes the striker plate out of the groove through the striker. When the expansion bag contracts, the striker plate hits the groove and makes a sound. The sound can be used to judge whether the expansion bag is completely contracted. When docking the steam pipe, as the steam pipe is continuously inserted into the docking port and the sleeve is continuously compressed, the striker plate continuously extends out of the groove. The extension distance of the striker plate can assist in judging the docking progress of the current steam pipe. The farther the striker plate extends, the higher the docking progress. When a sound is heard, it proves that the steam pipe and the detection tube have been docked. When the steam pipe and the detection tube are separated, the cylinder stretches and pushes the support plate, so that the expansion bag expands, and the impact plate continuously extends out of the groove. When the distance of the impact plate extending out of the groove no longer changes, it indicates that the clamping cylinder has been completely contracted, and the ferrule is no longer in contact with the flange of the steam pipe. The steam pipe can be pulled out of the shell. After the steam pipe is pulled out of the shell, the cylinder is reset and the impact plate hits the groove. A diffuse reflection sensor (not shown in the figure) is installed on one side of the docking interface inside the shell to detect whether there is a steam pipe and feedback a signal to the control box. The control box controls the micro air pump according to the feedback signal of the diffuse reflection sensor (no steam pipe signal) to quickly reset the cylinder. A strain gauge pressure sensor (not shown in the figure) is installed at one end of the impact plate. The strain gauge pressure sensor is connected to the control box to detect whether there is a split signal, that is, whether the steam pipe and the detection tube need to be separated. When a split signal is detected, the control box controls the micro air pump to work, so that the cylinder stretches and pushes the support plate.

[0013] A sealing gasket is arranged on the end surface of the flange away from the vertical plate, and the sealing gasket is used to increase the sealing performance between the detection tube and the steam pipeline.

[0014] A pressurized groove is arranged outside the inner side of the ferrule, and a heat expansion material and a pressurized shell are arranged in the pressurized groove. One end of the heat expansion material is connected to the ferrule, and the other end of the heat expansion material is connected to the pressurized shell. The pressurized shell and the ferrule are slidably connected in the axial direction. The heat expansion material is attached to the outside of the steam pipe. When the steam flows in the steam pipe, the heat expansion material absorbs the heat emitted by the steam pipe and expands. The expansion pushes the pressurized shell to move toward the flange, thereby increasing the butt sealing effect between the steam pipe and the detection tube. The higher the steam temperature, the greater the expansion of the heat expansion material, that is, the greater the pushing force of the pressurized shell on the flange, and the better the butt sealing between the steam pipe and the detection tube.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The control box is eccentrically installed on the back of the turntable. The weight of the control box is used to drive the turntable to rotate on the shell, so that the panel remains vertical to the ground, allowing the staff to view the content displayed on the panel normally without having to turn their heads to view due to the pipeline layout of the steam pipeline.

[0017] 2. The thermal expansion material is attached to the outside of the steam pipe. The thermal expansion material absorbs the heat of the steam and increases the sealing effect between the steam pipe and the detection tube. The higher the steam temperature, the greater the thermal expansion, that is, the greater the pushing force of the pressurized shell on the flange, and the better the docking sealing between the steam pipe and the detection tube.

[0018] 3. The control box monitors and calculates the pressure in the detection pipeline, and displays the calculated steam flow on the panel, through which the steam flow can be seen in real time. One of the pressure sensors is used to collect the stable steam pressure upstream of the detection pipeline, so that the control box can calculate the steam density, and use the obtained steam density to effectively compensate for the pressure and improve the accuracy of steam flow detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0020] Figure 2 A three-dimensional diagram of the connection between the panel and the turntable of the present invention;

[0021] Figure 3 It is a three-dimensional diagram of the internal structure of the housing of the present invention;

[0022] Figure 4 It is a stereoscopic diagram of the connection between the docking mechanism and the detection tube of the present invention;

[0023] Figure 5 It is a structural diagram of the steam pipeline of the present invention when it is connected to the detection tube;

[0024] Figure 6It is a cross-sectional view of the expansion bag, the collar and the cylinder of the present invention;

[0025] Figure 7 It is a half-section view of the ferrule of the present invention.

[0026] In the figure: 1. shell; 2. panel; 3. striker plate; 4. docking port; 5. turntable; 6. detection tube; 7. venturi tube; 8. striker; 9. clamping cylinder; 10. ferrule; 11. expansion bag; 12. flange; 13. micro air pump; 14. carrier plate; 15. hydraulic ring; 16. sleeve ring; 17. sleeve; 18. sealing gasket; 19. compression rod; 20. vertical plate; 21. bottom tube; 22. cylinder; 23. control box; 24. thermal expansion material; 25. pressurized casing; 100. steam pipe. DETAILED DESCRIPTION

[0027] 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.

[0028] Example: Figure 1 - Figure 7 As shown, the present invention provides a steam flow detection device with pressure compensation metering, comprising a detection pipeline and a shell 1, wherein the detection pipeline is composed of a detection tube 6 and a venturi tube 7, a flange 12 is arranged at one end of the detection tube 6 away from the venturi tube 7, and the detection tube 6 is installed inside the shell 1 through a support; the venturi tube 7 is connected in series to the detection tube 6, a pressure sensor is arranged in the middle of the detection tube 6 located in front of the inlet of the venturi tube 7, and pressure sensors are installed at the inlet and the contraction part of the venturi tube 7, and the detection pipeline is installed in the shell 1;

[0029] A sealing gasket 18 is disposed on the end surface of the flange 12 away from the vertical plate 20 . The sealing gasket 18 is used to increase the sealing performance between the detection tube 6 and the steam pipe 100 .

[0030] A docking mechanism is installed at both ends of the detection pipeline inside the shell 1, and docking ports 4 are provided at both ends of the shell 1. The external steam pipe 100 passes through the docking port 4. The docking mechanism connects the detection pipeline with the external steam pipe 100. The shell 1 is provided with a through groove, and a turntable 5 is installed on the outside of the panel 2. The turntable 5 is rotatably installed on the through groove, and the control box 23 is eccentrically installed on the back of the turntable 5. The control box 23 is connected to the pressure sensor.

[0031] A diffuse reflection sensor is installed on one side of the docking port 4 inside the shell 1 to detect whether there is a steam pipe 100 and to feed back a signal to the control box 23. The control box 23 controls the micro air pump 13 according to the diffuse reflection sensor feedback signal (no steam pipe 100 signal) to quickly reset the cylinder 22.

[0032] The docking mechanism includes a hydraulic ring 15 sleeved on the outside of the detection tube 6, a sleeve 17 inserted into the bolt hole of the flange 12, a vertical plate 20 installed inside the shell 1, one end of the vertical plate 20 is installed on the detection tube 6 and is located between the flange 12 and the support, a hollow compression rod 19 is slidably installed inside the sleeve 17, one end of the compression rod 19 passes through the vertical plate 20 and communicates with the inside of the hydraulic ring 15, a support spring is sleeved on the compression rod 19, one end of the support spring abuts against one end of the sleeve 17, and the other end of the support spring abuts against the vertical plate 20, and a plug-in column is provided at one end of the sleeve 17 away from the support spring, the diameter of the plug-in column is the same as the bolt hole diameter of the flange on the steam pipe 100, and the diameter of the plug-in column is smaller than the diameter of the sleeve 17. When the steam pipe 100 is docked with the detection tube 6, the steam pipe 100 is squeezed into the shell 1 from the docking port 4, and the plug-in column is inserted into the bolt hole on the steam pipe 100 to prevent the steam pipe 100 and the detection tube 6 from relative rotation.

[0033] A "U"-shaped tube is installed at each of the upper and lower ends of the hydraulic ring 15. An expansion bag 11 is connected in series to the middle of the "U"-shaped tube. A clamping cylinder 9 is vertically installed at one end of the "U"-shaped tube. Hydraulic oil is provided inside the sleeve 17, the compression rod 19, the hydraulic ring 15, the "U"-shaped tube, the expansion bag 11 and the clamping cylinder 9. A semi-annular clamping sleeve 10 is installed at the output end of the clamping cylinder 9. One end of the clamping sleeve 10 is slidably connected to the inner wall of the shell 1, and the clamping sleeve 10 is located on the inner side of the docking port 4.

[0034] The clamping cylinder 9 is composed of a section of "U"-shaped tube and a tube sleeved on the "U"-shaped tube. A sealing structure is arranged between the tube sleeve and the "U"-shaped tube. A spring with one end connected to the tube mouth of the "U"-shaped tube is arranged inside the tube sleeve. The other end of the spring is fixed inside the tube sleeve. The spring is used to support the position between the tube sleeve and the "U"-shaped tube. When the hydraulic oil enters the tube sleeve, the tube sleeve slides on the "U"-shaped tube and pushes the clamping sleeve 10 toward the steam pipe 100.

[0035] A collar 16 is installed at one end of the expansion bag 11, a bottom tube 21 is provided at one end of the collar 16, a carrier plate 14 is installed at one end of the bottom tube 21, one end of the carrier plate 14 is fixed to the inner wall of the shell 1, a cylinder 22 is provided inside the bottom tube 21, a micro air pump 13 is provided on the carrier plate 14, and the micro air pump 13 is connected to the cylinder 22 by a pipeline.

[0036] A limiting spring is arranged inside the expansion bag 11. Under the support of the limiting spring, the expansion bag 11 can only expand axially but not radially. The inner space of the ring 16 and the inner space of the bottom tube 21 are both connected to the inner space of the expansion bag 11, and the "U"-shaped tube is connected to the inner space of the ring 16.

[0037] A groove is provided on the upper end face of the shell 1, and a through hole is provided on the shell 1 that passes through the groove. A support plate is provided at the other end of the expansion bag 11, and a striker 8 is provided on the support plate. One end of the striker 8 is inserted into the through hole and is installed with a striker plate 3. The striker plate 3 is located in the groove, and a strain gauge pressure sensor is installed at the end of the striker plate 3 away from the striker 8. The strain gauge pressure sensor is connected to the control box 23 and is used to detect whether there is a split signal, that is, whether it is necessary to split the steam pipe 100 and the detection tube 6. When a split signal is detected, the control box 23 controls the micro air pump 13 to work, so that the cylinder 22 extends and pushes the support plate.

[0038] A pressurized groove is arranged outside the inner side of the ferrule 10, and a heat expansion material 24 and a pressurized shell 25 are arranged in the pressurized groove. One end of the heat expansion material 24 is connected to the ferrule 10, and the other end of the heat expansion material 24 is connected to the pressurized shell 25. The pressurized shell 25 is slidably connected to the ferrule 10 in the axial direction.

[0039] The working principle of the present invention is as follows: when the steam pipe 100 is docked, the steam pipe 100 is squeezed into the shell 1 from the docking port 4, the plug-in column is inserted into the bolt hole on the steam pipe 100, and the sleeve 17 is pressed against the flange of the steam pipe 100. As the steam pipe 100 continuously enters the shell 1, the steam pipe 100 moves toward the vertical plate 20 against the sleeve 17. As the sleeve 17 moves on the compression rod 19, the hydraulic oil in the sleeve 17 is squeezed into the hydraulic ring 15, and finally enters the clamping cylinder 9 through the "U"-shaped pipe. During the entry process of the steam pipe 100, the flange of the steam pipe 100 will hinder the radial movement of the ferrule 10, and then when the ferrule 10 is attached to the outside of the flange of the steam pipe 100, the clamping cylinder 9 will no longer extend.

[0040] When the sleeve 17 is continuously compressed and the clamping cylinder 9 no longer extends, the hydraulic oil is temporarily stored in the expansion bag 11, and the expansion bag 11 adapts to the increase of hydraulic oil by axial expansion; when the expansion bag 11 expands axially, the support plate pushes the impact plate 3 out of the groove through the impact pin 8. As the steam pipe 100 is continuously inserted into the docking port 4 and the sleeve 17 is continuously compressed, the impact plate 3 is continuously extended out of the groove. The extension distance of the impact plate 3 can assist in judging the docking progress of the current steam pipe 100. The farther the impact plate 3 is extended, the higher the docking progress. When a sound is heard, it proves that the steam pipe 100 and the detection tube 6 have been docked.

[0041] When the flange of the steam pipe 100 moves out of the ferrule 10, the hydraulic oil in the expansion bag 11 is squeezed into the clamping cylinder 9 under the contraction of the expansion bag 11 and the limiting spring, so that the clamping cylinder 9 extends again, so that the ferrule 10 is between the shell 1 and the flange of the steam pipe 100. The ferrule 10 resists the flange of the steam pipe 100 to prevent the steam pipe 100 from detaching from the shell 1.

[0042] When the expansion bag 11 contracts, the striker plate 3 strikes the groove and generates a sound.

[0043] The thermal expansion material 24 is attached to the outside of the steam pipe 100. When steam flows in the steam pipe 100, the thermal expansion material 24 absorbs the heat emitted by the steam pipe 100 and expands. The expansion pushes the pressurized shell 25 to move toward the flange, thereby increasing the docking sealing effect between the steam pipe 100 and the detection tube 6. The higher the steam temperature, the greater the expansion of the thermal expansion material 24, that is, the greater the pushing force exerted by the pressurized shell 25 on the flange, and the better the docking sealing between the steam pipe 100 and the detection tube 6.

[0044] The pressure sensor installed on the detection tube 6 is the pressure sensor located upstream of the Venturi tube 7. The pressure sensor in the detection tube 6 detects the smoothly flowing steam, performs pressure compensation for the subsequent detection of the steam flow, and improves the detection accuracy of the steam flow. A pressure sensor is installed at the inlet and the contraction part of the Venturi tube 7 respectively; the control box 23 calculates the pressure values ​​transmitted by the two pressure sensors on the Venturi tube 7, and finally calculates the steam flow.

[0045] When the steam pipe 100 and the detection tube 6 are separated, the strain gauge pressure sensor is pressed. When the control box 23 detects a separation signal, the control box 23 controls the micro air pump 13 to work. The micro air pump 13 works under the control of the control box 23 and injects air into the cylinder 22 to stretch the cylinder 22 and use the support plate to stretch the expansion bag 11, so that the expansion bag 11 expands and generates low pressure. The external air pressure acts on the ferrule 10, so that the clamping cylinder 9 contracts and squeezes the hydraulic oil inside itself into the expansion bag 11;

[0046] The expansion bag 11 expands, so that the striker plate 3 continuously extends out of the groove. When the distance of the striker plate 3 extending out of the groove no longer changes, it indicates that the clamping cylinder 9 has been completely contracted, and the clamping sleeve 10 is no longer in contact with the flange of the steam pipe 100, and the steam pipe 100 can be pulled out of the shell 1.

[0047] After losing the squeezing of the steam pipe 100, the supporting spring pushes the sleeve 17 back to its original position. During this process, the control box 23 controls the micro air pump 13 according to the feedback signal of the diffuse reflection sensor (no steam pipe 100 signal), so that the cylinder 22 is quickly reset and the cylinder 22 is quickly contracted. Under the pull of the limiting spring and the contraction of the expansion bag 11, the hydraulic oil in the expansion bag 11 flows back and enters the sleeve 17 again, and the impact plate 3 also returns to the groove.

[0048] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A steam flow detection device with pressure compensation metering, comprising a detection pipeline, the detection pipeline consisting of a detection tube (6) and a venturi tube (7), the venturi tube (7) being serially connected to the detection tube (6), a pressure sensor being arranged in the middle of the detection tube (6) in front of the inlet of the venturi tube (7), and pressure sensors being installed at the inlet and the contraction of the venturi tube (7), characterized in that: It also comprises a shell (1), wherein a detection pipeline is installed in the shell (1), a docking mechanism is installed at both ends of the detection pipeline inside the shell (1), docking ports (4) are provided at both ends of the shell (1), an external steam pipeline (100) passes through the docking ports (4), and the docking mechanism enables the detection pipeline to communicate with the external steam pipeline (100), a panel (2) is rotatably provided on the shell (1), a control box (23) is provided on the back of the panel (2), and the control box (23) is connected to the pressure sensor; A flange (12) is provided at one end of the detection tube (6) away from the venturi tube (7), and the detection tube (6) is installed inside the housing (1) via a support; The docking mechanism comprises a hydraulic ring (15) sleeved on the outside of the detection tube (6), and a sleeve (17) inserted into the bolt hole of the flange (12); a vertical plate (20) is installed inside the housing (1), one end of the vertical plate (20) is installed on the detection tube (6) and is located between the flange (12) and the support; a hollow compression rod (19) is slidably installed inside the sleeve (17), one end of the compression rod (19) passes through the vertical plate (20) and is connected to the inside of the hydraulic ring (15); a support spring is sleeved on the compression rod (19), one end of the support spring abuts against one end of the sleeve (17), and the support spring is The other end is against the vertical plate (20), and a "U"-shaped tube is installed at each of the upper and lower ends of the hydraulic ring (15). The middle part of the "U"-shaped tube is connected in series with an expansion bag (11), and a clamping cylinder (9) is vertically installed at one end of the "U"-shaped tube. Hydraulic oil is provided inside the sleeve (17), the compression rod (19), the hydraulic ring (15), the "U"-shaped tube, the expansion bag (11) and the clamping cylinder (9). A semi-annular clamping sleeve (10) is installed at the output end of the clamping cylinder (9), and one end of the clamping sleeve (10) is slidably connected to the inner wall of the shell (1), and the clamping sleeve (10) is located on the inner side of the docking port (4); A collar (16) is mounted on one end of the expansion bag (11), a bottom tube (21) is disposed on one end of the collar (16), a carrier plate (14) is mounted on one end of the bottom tube (21), one end of the carrier plate (14) is fixed to the inner wall of the shell (1), a limiting spring is disposed inside the expansion bag (11), the inner space of the collar (16) and the inner space of the bottom tube (21) are both in communication with the inner space of the expansion bag (11), and the U-shaped tube is in communication with the inner space of the collar (16); An air cylinder (22) is arranged inside the bottom cylinder (21), a micro air pump (13) is arranged on the carrier plate (14), and the micro air pump (13) is connected to the air cylinder (22) via a pipeline; The upper end surface of the shell (1) is provided with a groove, and the shell (1) is provided with a through hole penetrating the groove. The other end of the expansion bag (11) is provided with a support plate, and a striker (8) is provided on the support plate. One end of the striker (8) is inserted into the through hole and is installed with a striker plate (3), and the striker plate (3) is located in the groove.

2. A steam flow detection device with pressure compensation metering according to claim 1, characterized in that: A turntable (5) is mounted on the outside of the panel (2); the control box (23) is eccentrically mounted on the back of the turntable (5); a through slot is provided on the housing (1) at a position corresponding to the turntable (5); and the turntable (5) is rotatably mounted on the through slot.

3. A steam flow detection device with pressure compensation metering according to claim 1, characterized in that: An insert column is provided at one end of the sleeve (17) away from the support spring. The diameter of the insert column is the same as the diameter of the bolt hole of the flange on the steam pipe (100), and the diameter of the insert column is smaller than the diameter of the sleeve (17).

4. A steam flow detection device with pressure compensation metering according to claim 3, characterized in that: A sealing gasket (18) is provided on an end surface of the flange (12) away from the vertical plate (20).

5. A steam flow detection device with pressure compensation metering according to claim 3, characterized in that: A pressurizing groove is arranged on the inside of the ferrule (10) toward the outside, and a heat expansion material (24) and a pressurizing shell (25) are arranged in the pressurizing groove. One end of the heat expansion material (24) is connected to the ferrule (10), and the other end of the heat expansion material (24) is connected to the pressurizing shell (25). The pressurizing shell (25) is slidably connected to the ferrule (10) in the axial direction.

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