An orifice flow meter

Abstract

The invention discloses an orifice flowmeter, and relates to the technical field of flow detection. An orifice flowmeter includes a flow tube mechanism, the flow tube mechanism includes two symmetrical flow tubes, a metering assembly is arranged on the outer wall of the flow tube, an orifice assembly is inserted between the two symmetrical flow tubes, the orifice assembly includes a shell insertion mechanism, a blocking assembly is arranged on the inner wall of the flow tube, the shell insertion mechanism includes two shell plates, and a clamping column is fixedly connected on both sides between the two shell plates, and a middle hole is penetrated in the middle of the surface of the two shell plates, the orifice assembly also includes an inner liner assembly and an adjustment mechanism, the inner liner assembly is inserted through the middle hole and its two ends are connected to the flow tube through the blocking assembly, the inner liner assembly includes a guide mechanism, the guide mechanism includes a barrel belt, and the two end side walls of the barrel belt are uniformly penetrated with instrument holes, and the two ends of the barrel belt are symmetrically provided with connecting rings, and an orifice flowmeter can guide the turbulence caused by the obstruction of the fluid to reduce the induction error.

Description

Technical Field

[0001] The invention relates to the technical field of flow detection, in particular to an orifice flowmeter. Background Art

[0002] Flow meters are divided into differential pressure flow meters, rotor flow meters, throttling flow meters, slit flow meters, volumetric flow meters, electromagnetic flow meters, ultrasonic flow meters, etc. Classified by medium: liquid flow meters and gas flow meters.

[0003] Orifice flowmeter is a differential pressure flowmeter. It is a high range ratio differential pressure flow device that combines a standard orifice plate with a multi-parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter and pressure transmitter). The throttling device, also known as a differential pressure flowmeter, is composed of a primary detection device (throttling device) and a secondary device (differential pressure transmitter and flow display instrument). It is widely used in the flow measurement of gas, steam and liquid, and has a simple structure, easy maintenance and stable performance. The fluid that fills the pipeline flows through the throttling device in the pipeline, causing local contraction near the throttling device, increasing the flow rate, and generating a static pressure difference on the upstream and downstream sides.

[0004] The patent with announcement number CN111024170B discloses an orifice flowmeter, comprising: an orifice, an upstream flange and a downstream flange fixedly connected to the orifice and a pipeline, and also comprising: a first pressure sensor and a second pressure sensor are arranged on the upstream flange, the angle between the first pressure sensor and the second pressure sensor and the center of the upstream flange is 90 degrees, the first pressure sensor is used to detect a first pressure value on the upstream flange side in the pipeline, and the second pressure sensor is used to detect a second pressure value on the upstream flange side in the pipeline; a third pressure sensor and a fourth pressure sensor are installed on the downstream flange, the angle between the third pressure sensor and the fourth pressure sensor and the center of the downstream flange is 90 degrees, the third pressure sensor is used to detect a third pressure value on the downstream flange side in the pipeline, and the fourth pressure sensor is used to detect a fourth pressure value on the downstream flange side in the pipeline; the real-time differential pressure is calculated by arranging four pressure sensors to improve the accuracy of the detected real-time differential pressure. The angle between the first pressure sensor, the second pressure sensor and the center of the upstream flange is 90 degrees, the angle between the third pressure sensor, the fourth pressure sensor and the center of the downstream flange is 90 degrees, the first pressure sensor and the third pressure sensor are arranged with the longitudinal section of the orifice plate as the symmetry plane, the second pressure sensor and the fourth pressure sensor are arranged with the longitudinal section of the orifice plate as the symmetry plane, the first pressure sensor and the third pressure sensor are a group, the second pressure sensor and the fourth pressure sensor are a group, and the real-time differential pressure is obtained by analyzing the two groups of differential pressures to improve the accuracy of the real-time differential pressure, thereby improving the real-time mass flow of the detection orifice plate, so as to facilitate accurate billing according to the mass flow.

[0005] In the above technical solution, the pressure difference on both sides of the orifice plate is measured, and the pressure is generated by the flow rate of the fluid in the pipeline. The hole of the orifice plate for supplying fluid flow is located in the center, and the pressure sensors are distributed around the orifice plate. For the surrounding fluid, it may produce backflow after contacting the orifice plate, so that the flow rate of the surrounding fluid and the flow rate of the fluid passing through the central hole deviate, which is also one of the reasons for inaccurate measurement. Although this deviation can be reduced by symmetrically arranging multiple pressure sensors on the sides, the problem of flow rate disturbance caused by orifice plate obstruction always affects the measurement results. Therefore, an orifice flowmeter is urgently needed to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide an orifice flowmeter to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: an orifice flowmeter, comprising a flow tube mechanism, the flow tube mechanism comprising two symmetrical flow tubes, and a metering component is arranged on the outer wall of the flow tube;

[0008] An orifice plate assembly is inserted between the two symmetrical flow tubes, and the orifice plate assembly includes a shell inserting mechanism;

[0009] A blocking component is provided on the inner wall of the flow tube;

[0010] The shell inserting mechanism comprises two shell plates, with clamping columns fixedly connected to both sides of the two shell plates, and a central hole is formed through the middle of the surface of the two shell plates;

[0011] The orifice plate assembly also includes an inner liner assembly and an adjustment mechanism, the inner liner assembly is inserted through the middle hole and its two ends are connected to the flow tube through the blocking assembly, and the inner liner assembly includes a guide mechanism;

[0012] The guide mechanism comprises a tube belt, and the side walls at both ends of the tube belt are evenly penetrated with holes;

[0013] The two ends of the barrel belt are symmetrically provided with connecting rings, a connecting ring is fixedly connected between the connecting ring and the barrel belt, the end surface of the connecting ring close to the barrel belt is fixedly connected to a protective shell sleeved with the barrel belt, the inner wall of the ring of the protective shell is evenly and evenly fixedly connected with wiring, and the end of the wiring away from the protective shell is fixedly connected to a first pressure sensor embedded in the device hole;

[0014] A sensing mechanism is installed inside the middle of the tube belt, and the sensing mechanism includes a main column, and small columns are fixedly inserted in the middle of both end surfaces of the main column, and a second pressure sensor is fixedly installed at one end of the small column away from the main column;

[0015] The adjusting mechanism is plugged into the shell plugging mechanism.

[0016] As a preferred technical solution of the present invention, a first groove is provided in the middle of the opposite end surfaces of the two flow tubes;

[0017] The blocking assembly comprises an annular belt ring, the belt ring is embedded in the inner wall of the fixed flow tube, the inner wall of the belt ring is flush with the inner wall of the flow tube, and an annular protrusion is fixedly connected to the middle of the inner wall of the belt ring;

[0018] The metering component includes a ring-shaped transmitter, the transmitter is fixedly connected to the flow tube, a transmission head is installed on one side of the transmitter fixed to the flow tube, the transmission head passes through the flow tube and fits the protective shell, and a transmission line is connected between the ring-shaped transmitters.

[0019] The opposite sides of the two shell plates correspond to the flow tube, and the opposite sides of the two shell plates are fixedly connected with a first rubber pad adapted to be inserted into the first card slot and a second rubber pad adapted to be connected to the flow tube.

[0020] As a preferred technical solution of the present invention, the connecting ring is formed into a ring shape by fitting two symmetrical parts, the end surface of the connecting ring away from the barrel is inclined and connected with the inner wall of the flow tube, and a second groove adapted to the plug-in protrusion is opened in the middle of the outer wall of the connecting ring;

[0021] The chain is formed by fitting two symmetrical parts together to form a ring, and the two parts of the chain correspond to the two parts of the connecting ring;

[0022] The protective shell is formed into a ring shape by fitting two symmetrical parts, and the two parts of the protective shell correspond to the two parts of the connecting ring.

[0023] As a preferred technical solution of the present invention, the side wall of the main column is evenly and evenly fixedly connected with an insert tube, the end of the insert tube away from the main column is plugged with a first insert column, the extended end of the first insert column is fixedly connected with a gusset plate, and the gusset plate penetrates the embedded tube belt;

[0024] The insertion end of the first plug post is fixedly connected with a spring, and one end of the spring away from the first plug post is fixedly connected to the main post.

[0025] As a preferred technical solution of the present invention, the adjustment mechanism includes two opposite semicircular adjustment plates, the opposite surfaces of the adjustment plates on one side are fixedly connected with the second plug posts, and the opposite surfaces of the adjustment plates on the other side are provided with slots adapted to be plugged with the second plug posts;

[0026] The two sides of the two adjustment plates are penetrated by two holes for plugging with the clamping column;

[0027] Flow holes are provided through the middle parts of the opposite sides of the two adjustment plates.

[0028] As a preferred technical solution of the present invention, an outer plate mechanism for retaining is provided on the outer side of the orifice plate assembly, and the outer plate mechanism includes two annular outer plates, each of which is formed by two parts being clamped together, and the outer plates are correspondingly clamped on the outer side of the flow tube;

[0029] The opposite sides of the two outer plates correspond to the transmitter, and the opposite sides of the two outer plates correspond to the second rubber pad;

[0030] The outer edges of the two outer plates are uniformly and equidistantly interspersed with studs that fit the outer sides of the adjustment plates, and bolts are screwed onto the threads at both ends of the studs.

[0031] As a preferred technical solution of the present invention, a reading mechanism is commonly installed on the outer sides of the two metering components, and the reading mechanism includes a reader. Pins are symmetrically installed on both sides of the reader, and the end of the pin away from the reader corresponds to the docking installation transmitter.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] An orifice flowmeter can replace the adjustment mechanism of the plug-in shell mechanism, so that the flow holes with different radii can be replaced, and the hole area for flow circulation can be changed more flexibly. The hole area is regular and convenient for calculation, thereby improving the measurement flexibility.

[0034] An orifice flowmeter, the inner wall formed by the tube belt of the connecting ring toward the sensing mechanism is inclined, so that when the fluid flows through here, it can be uniformly guided to the sensing mechanism through the tube belt, thereby reducing the obstruction to the fluid, guiding the turbulence caused by the obstruction of the fluid, and reducing the sensing error.

[0035] An orifice flowmeter has a basic flow radius, i.e., the inner diameter of the center hole, when the regulating mechanism is replaced, so as to avoid the inner pressure of the tube belt from damaging the tube belt, thereby improving the safety of use when replacing the regulating mechanism, and replacing the regulating mechanism does not affect the normal use of the flowmeter, thereby stabilizing the flow efficiency of the flowmeter.

[0036] An orifice flowmeter can accurately detect the pressure values ​​on both sides of the flow radius formed by the convection hole, improve the position accuracy of the second pressure sensor, and further improve the measurement accuracy of the flowmeter.

[0037] An orifice flowmeter further transmits the information to a transmitter through the connection between a protective shell and a transmission head, thereby detecting the flow pressure around both sides of a second pressure sensor, providing auxiliary support for the detection data, and improving the comprehensiveness of the flowmeter's detection.

[0038] An orifice flowmeter is installed by plugging a plate-hole assembly so that the plate-hole assembly can be removed. When a second pressure sensor and a first pressure sensor mounted on an inner tank assembly have problems, the plate-hole assembly can be easily disassembled, thereby facilitating the inspection and replacement of the second pressure sensor and the first pressure sensor, thereby increasing the service life of the flowmeter.

[0039] An orifice flowmeter, through the design of an outer plate mechanism, can fasten the outer plates on both sides by tightening bolts to fix the plate hole assembly, and through the position design of the studs, can simultaneously lock and limit the adjustment mechanism to improve the connection stability of the flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1It is a structural schematic diagram of the present invention;

[0041] Figure 2 It is a schematic diagram of the flow tube mechanism of the present invention;

[0042] Figure 3 For the present invention Figure 2 A magnified schematic diagram of point A;

[0043] Figure 4 It is a schematic diagram of the plate hole assembly of the present invention;

[0044] Figure 5 It is a schematic diagram of the shell inserting mechanism of the present invention;

[0045] Figure 6 It is a schematic diagram of the guide mechanism of the present invention;

[0046] Figure 7 It is a schematic diagram of the drum belt of the present invention;

[0047] Figure 8 For the present invention Figure 7 An enlarged schematic diagram of point B;

[0048] Fig. 9 This is a schematic diagram of the connection of the linking ring of the present invention;

[0049] Fig.10 It is a schematic diagram of the sensing mechanism of the present invention;

[0050] Fig.11 It is a schematic diagram of the regulating mechanism of the present invention;

[0051] Fig.12 This is a schematic diagram of the connection of the regulating mechanism of the present invention;

[0052] Fig.13 It is a schematic diagram of the outer panel mechanism of the present invention;

[0053] Fig.14 The present invention is a schematic diagram of the outer panel mechanism position plane;

[0054] Fig.15 It is a schematic diagram of the reading mechanism of the present invention.

[0055] In the figure: 1. flow tube mechanism; 101. flow tube; 102. first slot; 103. belt ring; 104. protrusion; 105. transmitter; 106. transmitter head; 107. transmitter line; 2. shell inserting mechanism; 201. shell plate; 202. clamping column; 203. middle hole; 204. first rubber pad; 205. second rubber pad; 3. guide mechanism; 301. barrel belt; 302. connecting ring; 303. second slot; 304. chain; 305. shell; 306. device hole; 307. wiring; 308, first pressure sensor; 4, sensing mechanism; 401, main column; 402, small column; 403, second pressure sensor; 404, plug tube; 405, first plug column; 406, buckle plate; 407, spring; 5, adjustment mechanism; 501, adjustment plate; 502, second plug column; 503, slot; 504, card hole; 505, flow hole; 6, outer panel mechanism; 601, outer panel; 602, stud; 603, bolt; 7, reading mechanism; 701, reader; 702, pin. DETAILED DESCRIPTION

[0056] 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.

[0057] Example: See Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig.10 , Fig.12 , an orifice flowmeter, comprising a flow tube mechanism 1, the flow tube mechanism 1 comprising two symmetrical flow tubes 101, and a metering component is arranged on the outer wall of the flow tube 101;

[0058] An orifice plate assembly is inserted between two symmetrical flow tubes 101, and the orifice plate assembly includes a shell inserting mechanism 2;

[0059] A blocking assembly is provided on the inner wall of the flow tube 101;

[0060] The shell inserting mechanism 2 includes two shell plates 201, and clamping columns 202 are fixedly connected on both sides of the two shell plates 201. A middle hole 203 is opened through the middle of the surface of the two shell plates 201;

[0061] The orifice plate assembly further includes an inner liner assembly and an adjustment mechanism 5. The inner liner assembly is inserted through the middle hole 203 and its two ends are connected to the flow tube 101 through a blocking assembly. The inner liner assembly includes a guide mechanism 3.

[0062] The guide mechanism 3 includes a tube belt 301, which is made of elastic material. The side walls at both ends of the tube belt 301 are evenly penetrated with holes 306 at equal distances.

[0063] Connecting rings 302 are symmetrically arranged at both ends of the barrel belt 301, and a connecting ring 304 is fixedly connected between the connecting ring 302 and the barrel belt 301. A protective shell 305 sleeved with the barrel belt 301 is fixedly connected to the end surface of the connecting ring 302 close to the barrel belt 301, and wiring 307 is evenly and evenly fixedly connected to the inner wall of the ring of the protective shell 305. The end of the wiring 307 away from the protective shell 305 is fixedly connected to the first pressure sensor 308 embedded in the device hole 306;

[0064] A sensing mechanism 4 is installed inside the middle of the tube belt 301. The sensing mechanism 4 includes a main column 401. Small columns 402 are fixedly inserted in the middle of both end surfaces of the main column 401. A second pressure sensor 403 is fixedly installed at one end of the small column 402 away from the main column 401.

[0065] The adjusting mechanism 5 is plugged into the housing mechanism 2 .

[0066] See also Figure 3 , Figure 4 , Figure 5 A first slot 102 is provided in the middle of the opposite end surfaces of the two flow tubes 101;

[0067] The blocking assembly includes an annular belt ring 103, which is embedded in the inner wall of the fixed flow tube 101, and the inner wall of the belt ring 103 is flush with the inner wall of the flow tube 101. An annular protrusion 104 is fixedly connected to the middle of the inner wall of the belt ring 103;

[0068] The metering assembly includes a ring-shaped transmitter 105, which is fixedly connected to the flow tube 101. A transmission head 106 is installed on one side of the transmitter 105 fixed to the flow tube 101. The transmission head 106 penetrates the flow tube 101 and fits the protective shell 305. A transmission line 107 is connected between the ring-shaped transmitters 105.

[0069] The opposite sides of the two shell plates 201 correspond to the flow tube 101, and the opposite sides of the two shell plates 201 are fixedly connected with a first rubber pad 204 adapted to be inserted into the first card slot 102 and a second rubber pad 205 adapted to be connected to the flow tube 101. The first rubber pad 204 and the second rubber pad 205 are both made of rubber material.

[0070] See also Figure 7 , Figure 8 , Fig. 9The connecting ring 302 is formed into a ring shape by two symmetrical parts fitting together. The end surface of the connecting ring 302 away from the barrel 301 is inclined and connected with the inner wall of the flow tube 101. The middle part of the outer wall of the connecting ring 302 is provided with a second slot 303 adapted to the plug-in protrusion 104.

[0071] The connecting ring 304 is formed by two symmetrical parts fitting together to form a ring, and the two parts of the connecting ring 304 correspond to the two parts of the connecting ring 302;

[0072] The protective shell 305 is formed into a ring shape by fitting two symmetrical parts, and the two parts of the protective shell 305 correspond to the two parts of the connecting ring 302 .

[0073] See also Figure 6 , Fig.10 The side wall of the main column 401 is evenly and evenly fixedly connected with an inserting tube 404, and the end of the inserting tube 404 away from the main column 401 is plugged with a first inserting column 405, and the extended end of the first inserting column 405 is fixedly connected with a buckle plate 406, and the buckle plate 406 penetrates the embedded tube belt 301;

[0074] The insertion end of the first plug post 405 is fixedly connected to a spring 407 , and one end of the spring 407 away from the first plug post 405 is fixedly connected to the main post 401 .

[0075] See also Fig.11 , Fig.12 The adjustment mechanism 5 includes two opposite semicircular adjustment plates 501, a second plug post 502 is fixedly connected to the opposite surface of the adjustment plate 501 on one side, and a slot 503 adapted to be plugged with the second plug post 502 is provided on the opposite surface of the adjustment plate 501 on the other side;

[0076] The two adjustment plates 501 have two opposite sides through which there are provided holes 504 adapted to be plugged with the clamping posts 202;

[0077] A flow hole 505 is formed through the middle of the opposite sides of the two adjustment plates 501 . The inner diameter of the flow hole 505 is smaller than the inner diameter of the middle hole 203 .

[0078] See also Fig.13 , Fig.14 , Fig.15 The outer side of the orifice plate assembly is provided with an outer plate mechanism 6 for fixing, and the outer plate mechanism 6 includes two annular outer plates 601, each outer plate 601 is formed by two parts being clamped together, and the outer plates 601 are correspondingly clamped together on the outer side of the flow tube 101;

[0079] The opposite sides of the two outer plates 601 correspond to the transmitter 105, and the opposite sides of the two outer plates 601 correspond to the second rubber pad 205;

[0080] The outer edges of the two outer plates 601 are evenly and equidistantly interspersed with studs 602 that fit the outer side of the adjustment plate 501. Bolts 603 are screwed onto the threads of the two ends of the studs 602. By screwing the bolts 603 on the studs 602, the outer plates 601 on both sides are brought close to each other and squeeze the orifice plate assembly.

[0081] See also Fig.15 A reading mechanism 7 is installed on the outside of the two metering components. The reading mechanism 7 includes a reader 701. Pins 702 are symmetrically installed on both sides of the reader 701. The end of the pin 702 away from the reader 701 corresponds to the docking installation transmitter 105, so that the data read by the metering components on both sides are comprehensively processed and the data is read through the display screen on the reader 701.

[0082] The working principle of the present invention is as follows:

[0083] The adjusting mechanism 5 is clamped on the plug-in shell mechanism 2, and the flow hole 505 squeezes the buckle plate 406 so that the middle part of the tube belt 301 is surrounded by a size suitable for the flow hole 505. When the fluid flows through the middle part of the tube belt 301, the cross-sectional area through which the fluid flows can be estimated by the radius of the flow hole 505. The adjusting mechanism 5 is plugged into the plug-in shell mechanism 2. The adjusting mechanism 5 includes two opposite semicircular adjusting plates 501, and the two opposite semicircular adjusting plates 501 are plugged into the second plug column 502 and the slot 503, so that the adjusting mechanism 5 plugged into the plug-in shell mechanism 2 can be replaced, so that the flow hole 505 of different radius can be replaced, and the hole area for flow circulation can be changed more flexibly, and the hole area is regular and convenient for calculation, thereby improving measurement flexibility.

[0084] By inserting the inner liner assembly into the plug-in shell mechanism 2, the tube belt 301 is made of elastic material. When the adjustment mechanism 5 is plugged into the plug-in shell mechanism 2 and the middle flow radius of the tube belt 301 is limited by the flow hole 505, the inner wall formed by the connecting ring 302 to the tube belt 301 of the sensing mechanism 4 is inclined, so that when the fluid flows through here, it can be uniformly guided to the sensing mechanism 4 through the tube belt 301, thereby reducing the obstruction to the fluid, guiding the turbulence caused by the obstruction of the fluid, and reducing the sensing error.

[0085] Due to the presence of the sensing mechanism 4, when the regulating mechanism 5 equipped with the flow hole 505 of different radius is replaced, the buckle plate 406 on the sensing mechanism 4 is expanded outward by the presence of the spring 407, so that the outer wall of the buckle plate 406 and the middle hole 203 form a conflict, thereby forming an inner support and fixation of the barrel belt 301. In this way, when the regulating mechanism 5 is replaced, the flow meter has a basic flow radius, that is, the inner diameter of the middle hole 203, thereby avoiding the inner pressure of the barrel belt 301 from damaging the barrel belt 301, thereby improving the safety of use when replacing the regulating mechanism 5, and replacing the regulating mechanism 5 does not affect the normal use of the flow meter, thereby stabilizing the flow efficiency of the flow meter.

[0086] The sensing mechanism 4 is fixedly connected to the middle part of the tube belt 301, and the second pressure sensors 403 are mounted on both sides of the main column 401. Meanwhile, the sensing mechanism 4 is located opposite to the flow radius formed by the flow hole 505, so that the pressure values ​​on both sides of the flow radius formed by the flow hole 505 can be accurately detected, thereby improving the position accuracy of the second pressure sensor 403 and further improving the measurement accuracy of the flow meter.

[0087] A rigid support is formed on the outside of the cartridge belt 301 by the protective shell 305, so as to protect the cartridge belt 301 under high pressure, and the first pressure sensor 308 connected through the wiring 307 is embedded and installed on the cartridge belt 301, so that the flow rate guided through the cartridge belt 301 can be measured, and further transmitted to the transmitter 105 through the docking of the protective shell 305 and the transmission head 106, so as to detect the flow pressure around the two sides of the second pressure sensor 403, provide auxiliary support for the detection data, and improve the comprehensiveness of the detection of the flow meter.

[0088] By plugging and installing the plate hole assembly, the plate hole assembly can be taken out. When problems occur with the second pressure sensor 403 and the first pressure sensor 308 mounted on the inner tank assembly, the plate hole assembly can be easily disassembled, thereby facilitating the inspection and replacement of the second pressure sensor 403 and the first pressure sensor 308, thereby increasing the service life of the flow meter.

[0089] Through the design of the outer plate mechanism 6, the outer plates 601 on both sides can be tightened by tightening the bolts 603 to fix the plate hole assembly in place, and through the position design of the stud 602, the adjustment mechanism 5 can be locked and limited at the same time, thereby improving the connection stability of the flow meter.

[0090] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An orifice flow meter, comprising a flow tube mechanism (1), the flow tube mechanism (1) comprising two symmetrical flow tubes (101), and a metering component is arranged on the outer wall of the flow tube (101); An orifice plate assembly is inserted between the two symmetrical flow tubes (101), and the orifice plate assembly comprises a shell inserting mechanism (2); Features: A blocking component is provided on the inner wall of the flow tube (101); The shell inserting mechanism (2) comprises two shell plates (201), with clamping columns (202) fixedly connected to both sides of the two shell plates (201), and a middle hole (203) penetrating through the middle of the surface of the two shell plates (201); The orifice plate assembly further comprises an inner liner assembly and an adjustment mechanism (5); the inner liner assembly penetrates the middle hole (203) and its two ends are connected to the flow tube (101) via a blocking assembly; the inner liner assembly comprises a guide mechanism (3); The guide mechanism (3) comprises a tube belt (301), and the side walls at both ends of the tube belt (301) are evenly and equidistantly penetrated with device holes (306); Connecting rings (302) are symmetrically arranged at both ends of the barrel belt (301), a connecting ring (304) is fixedly connected between the connecting ring (302) and the barrel belt (301), a protective shell (305) sleeved with the barrel belt (301) is fixedly connected to the end surface of the connecting ring (302) close to the barrel belt (301), a wire (307) is fixedly connected to the inner wall of the ring of the protective shell (305) at equal intervals, and a first pressure sensor (308) embedded in the device hole (306) is fixedly connected to the end of the wire (307) away from the protective shell (305); A sensing mechanism (4) is installed on the inner side of the middle of the tube belt (301), and the sensing mechanism (4) comprises a main column (401), and small columns (402) are fixedly inserted in the middle of both end surfaces of the main column (401), and a second pressure sensor (403) is fixedly installed at one end of the small column (402) away from the main column (401); The adjusting mechanism (5) is plugged into the plug-in housing mechanism (2); The side wall of the main column (401) is evenly and evenly fixedly connected with an inserting tube (404), one end of the inserting tube (404) away from the main column (401) is plugged with a first inserting column (405), and the protruding end of the first inserting column (405) is fixedly connected with a buckle plate (406), and the buckle plate (406) penetrates the embedded tube belt (301); The insertion end of the first plug post (405) is fixedly connected to a spring (407), and one end of the spring (407) away from the first plug post (405) is fixedly connected to the main post (401).

2. An orifice flowmeter according to claim 1, characterized in that: A first clamping groove (102) is provided in the middle of the opposite end surfaces of the two flow tubes (101); The blocking assembly comprises an annular belt ring (103), the belt ring (103) being embedded in the inner wall of the fixed flow tube (101), the inner wall of the belt ring (103) being flush with the inner wall of the flow tube (101), and an annular protrusion (104) being fixedly connected to the middle of the inner wall of the belt ring (103); The metering assembly comprises a transmitter (105) arranged in a ring shape, the transmitter (105) being fixedly connected to a flow tube (101), a transmitter head (106) being installed on one side of the transmitter (105) fixedly connected to the flow tube (101), the transmitter head (106) penetrating the flow tube (101) and fitting the protective shell (305), and a transmission line (107) connecting the transmitters (105) arranged in a ring shape.

3. An orifice flowmeter according to claim 2, characterized in that: The opposite sides of the two shell plates (201) correspond to the flow tube (101), and the opposite sides of the two shell plates (201) are fixedly connected with a first rubber pad (204) adapted to be plugged into the first card slot (102) and a second rubber pad (205) adapted to be connected to the flow tube (101).

4. An orifice flowmeter according to claim 2, characterized in that: The connecting ring (302) is formed of two symmetrical parts that are fitted together to form a ring shape. The end surface of the connecting ring (302) that is away from the barrel belt (301) is inclined and connected to the inner wall of the flow tube (101). A second slot (303) adapted to the plug-in protrusion (104) is provided in the middle of the outer wall of the connecting ring (302). The connecting ring (304) is formed into a ring shape by fitting two symmetrical parts together, and the two parts of the connecting ring (304) correspond to the two parts of the connecting ring (302); The protective shell (305) is formed into a ring shape by fitting two symmetrical parts together, and the two parts of the protective shell (305) correspond to the two parts of the connecting ring (302).

5. The orifice flowmeter according to claim 3, characterized in that: The adjustment mechanism (5) comprises two opposite semicircular adjustment plates (501), the opposite surfaces of the adjustment plate (501) on one side being fixedly connected with a second plug post (502), and the opposite surface of the adjustment plate (501) on the other side being provided with a slot (503) adapted to be plugged with the second plug post (502); Both sides of the two adjustment plates (501) on opposite sides are provided with clamping holes (504) adapted to be plugged with the clamping columns (202); Flow holes (505) are provided through the middle parts of the opposite sides of the two adjustment plates (501).

6. An orifice flowmeter according to claim 5, characterized in that: An outer plate mechanism (6) for fixing is arranged on the outer side of the orifice plate assembly, the outer plate mechanism (6) comprising two annular outer plates (601), each of the outer plates (601) being formed by two parts being clamped together, and the outer plates (601) are correspondingly clamped together on the outer side of the flow tube (101); The opposite sides of the two outer plates (601) are correspondingly attached to the transmitter (105), and the opposite sides of the two outer plates (601) are correspondingly attached to the second rubber pad (205); The outer edges of the two outer plates (601) are uniformly and equidistantly interspersed with studs (602) that fit the outer sides of the adjustment plates (501), and both ends of the studs (602) are threadedly screwed with bolts (603).

7. An orifice flowmeter according to claim 2, characterized in that: A reading mechanism (7) is commonly installed on the outside of the two metering components, and the reading mechanism (7) comprises a reader (701). Pins (702) are symmetrically installed on both sides of the reader (701), and one end of the pin (702) away from the reader (701) corresponds to a docking installation of a transmitter (105).

Images