Plug-in gas mass flowmeter

Abstract

The application discloses an insertion type gas mass flowmeter and relates to the technical field of flowmeters. The insertion type gas mass flowmeter comprises an insertion rod, a measuring plate and a transmission mechanism. The insertion rod is fixed to a gas transmission pipeline through a threaded sleeve. The measuring plate is internally provided with a heated cavity. A kerosene temperature difference is used to drive an expansion and contraction piston rod, which drives a gear and a conductive needle rod to slide on an arc-shaped resistance strip, changes a circuit current and reflects a flow speed. Meanwhile, deformation of the measuring plate is detected through a laser and a multi-mirror system to change a light position, so that double flow speed measurement is realized.

Description

Technical Field

[0001] This invention relates to the field of flow meter technology, specifically to an insertion-type gas mass flow meter. Background Technology

[0002] Existing gas mass flow meters mainly include differential pressure flow meters and vortex flow meters. Differential pressure flow meters calculate flow rate using the pressure difference within the pipeline, while vortex flow meters detect flow velocity based on vortex frequency. However, these common flow meters have several shortcomings. First, differential pressure flow meters are susceptible to pipeline vibration at high flow rates, while vortex flow meters respond slowly to pulsating flow, leading to distortion of instantaneous flow data. Furthermore, most common flow meters employ a single measurement principle; if a core component fails, the entire system fails, resulting in insufficient reliability. Traditional flow meters have complex structures, and external sensors or probes are exposed to the gas, making them susceptible to corrosion or mechanical wear, resulting in poor durability and high maintenance costs. These deficiencies make common flow meters perform poorly in high-precision, multi-condition applications. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: an insertion-type gas mass flow meter, comprising an insertion rod, a gas flow hole at the bottom of the insertion rod, two symmetrically and parallelly arranged measuring plates inside the gas flow hole, and a tail guide plate fixedly installed on each of the two measuring plates; each measuring plate is hollow inside, and a heated cavity is fixedly embedded in the cavity inside the measuring plate, and a telescopic cylinder is fixedly connected to each heated cavity, and a telescopic piston rod is slidably and sealed inside each telescopic cylinder, the two telescopic piston rods jointly driving the conductive needle rod to rotate; a measuring plate support plate is fixedly installed on the top of each of the two measuring plates, the measuring plate support plate is fixedly installed on a rotating cover, the rotating cover is rotatably disposed inside the insertion rod, and a hollow shaft is fixedly connected to the axial center of the rotating cover, the top end of the hollow shaft extending above the top end of the insertion rod.

[0004] Preferably, a threaded sleeve is fixedly fitted at the top of the insertion rod, and a gap is provided between the inner wall of the threaded sleeve and the outer surface of the insertion rod, which allows the threaded tube to be inserted. The threaded sleeve can be threaded onto the threaded tube, and a nut is threaded onto the threaded tube, with the nut engaging with the threaded sleeve.

[0005] Preferably, a swing cylinder is movably mounted on the top of the threaded sleeve or the insertion rod, and a swing rod is movably connected to the telescopic rod end of the swing cylinder. The end of the swing rod away from the swing cylinder is fixedly engaged with the hollow shaft. A top buckle is fixedly mounted on the threaded sleeve. The swing rod and the swing cylinder are located inside the swing cylinder, and the top of the hollow shaft extends to the outside of the top buckle.

[0006] Preferably, the hollow shaft is rotatably engaged with the insertion rod and the top buckle plate; both heating chambers are filled with kerosene, and one of the heating chambers is equipped with a heating wire for heating the kerosene, which is isolated from the kerosene.

[0007] Preferably, a movable reflector is fixedly installed on the top of the inner wall of one of the measuring plates, and a laser is arranged diagonally above the movable reflector. The laser is fixedly installed on the support side plate, which is fixedly installed on the measuring plate support plate. Multiple fixed reflectors and a light sensor are also fixedly installed on the support side plate. The light emitted by the laser is reflected by the movable reflector to the fixed reflector closest to the laser, and then reflected to the light sensor by the cooperation of multiple fixed reflectors, thereby extending the propagation path of the light.

[0008] Preferably, the conductive needle rod is fixedly mounted on the gear, and the rotation axis of the conductive needle rod is coaxial with the gear. The gear is rotatably mounted on the gear bracket, and the gear bracket is slidably mounted on two parallel second slide rods. Two first slide rods are arranged on the sides of the two second slide rods, and the two first slide rods and the two second slide rods are all fixedly mounted on the measuring plate support plate.

[0009] Preferably, a rack is fixedly installed at the top of each telescopic piston rod, and two racks are slidably installed on the corresponding two first slide rods, wherein the opposite surfaces of the two racks mesh with a gear.

[0010] Preferably, the gear bracket is fixedly mounted on the arc-shaped resistance strip via the arc-shaped resistance strip bracket, and the center of the arc-shaped resistance strip is concentric with the center of the conductive needle rod, wherein the arc-shaped resistance strip and the conductive needle rod are in sliding conductive engagement.

[0011] Preferably, one end of the conductive needle rod, the conductive needle rod, and the protective resistor are connected in series in a DC circuit. By changing the position of the conductive needle rod on the arc-shaped resistor bar, the current in the DC circuit can be changed.

[0012] Preferably, the threaded tube is part of the gas transmission pipeline, wherein the threaded tube is disposed on the outer surface of the gas transmission pipeline, and the axis of the threaded tube points to the center of the cross-section of the gas transmission pipeline.

[0013] Compared with the prior art, the present invention has the following advantages: (1) The present invention uses the temperature difference of kerosene in the double measuring plate and the heated cavity to drive the gear and conductive needle rod to slide on the arc-shaped resistance bar, thereby accurately adjusting the circuit current to reflect the flow rate. The synergistic effect of the double plate combined with the rack and pinion transmission ensures that reliable data can still be provided in complex environments; (2) The present invention uses the swing electric cylinder and rotating cover to adjust the angle of the measuring plate, and uses an optical system composed of a laser, a moving reflector and multiple fixed reflectors to extend the optical path to detect the deformation of the measuring plate, and captures minute changes through a light sensor. This high-sensitivity design makes up for the deficiency of ordinary flow meters in detecting pulsating flow or instantaneous changes, and significantly improves the measurement accuracy; (3) The present invention combines the dual mechanisms of heat transfer and mechanical deformation, and reflects the flow rate through changes in current and light respectively. Even if one system fails, the other system can still operate. Compared with the disadvantage of ordinary flow meters being prone to complete failure in a single mode, this invention greatly improves the reliability of the equipment and achieves data mutual calibration. (4) This invention integrates the arc-shaped resistance strip and the conductive needle rod inside the rotating housing, so that it cannot directly contact the gas, thereby achieving isolation to avoid corrosion, reducing maintenance costs and extending service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the installation location structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 3 This is a schematic diagram of the structure at the gas flow hole of the present invention.

[0017] Figure 4 This is a schematic diagram of the rotating cover structure of the present invention.

[0018] Figure 5 For the present invention Figure 4 Schematic diagram of the structure at point A in the middle.

[0019] Figure 6 This is a schematic diagram of the structure at the fixed reflector of the present invention.

[0020] Figure 7 This is a schematic diagram of the heated cavity structure of the present invention.

[0021] In the diagram: 101-Threaded pipe; 102-Nut; 103-Threaded sleeve; 104-Gas transmission pipe; 105-Top buckle plate; 106-Hollow shaft; 107-Swing rod; 108-Swing electric cylinder; 109-Insertion rod; 110-Gas flow hole; 111-Rotating cover; 112-Measuring plate support plate; 113-Measuring plate; 114-Tail guide plate; 115-Telescopic cylinder; 116-Heated cavity; 117-Supporting side plate; 118-Laser; 119-Fixed reflector; 120-Light sensor; 121-Moving reflector; 122-Telescopic piston rod; 123-Rack; 124-First slide rod; 125-Second slide rod; 126-Gear bracket; 127-Gear; 128-Arc-shaped resistance strip; 129-Arc-shaped resistance strip bracket; 130-Conductive needle rod. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-7 The technical solution of the present invention will be further illustrated through specific embodiments.

[0023] This invention provides an insertion-type gas mass flow meter, including an insertion rod 109. A gas flow hole 110 is formed at the bottom of the insertion rod 109. Two symmetrically arranged parallel measuring plates 113 are disposed inside the gas flow hole 110. A tail guide plate 114 is fixedly installed on each of the two measuring plates 113. Each measuring plate 113 is hollow, and a heated cavity 116 is fixedly embedded in the cavity inside each measuring plate 113. A telescopic cylinder 115 is fixedly connected to each heated cavity 116. Both telescopic piston rods 122 are slidably sealed inside the retractable cylinder 115, and the two telescopic piston rods 122 jointly drive the conductive needle rod 130 to rotate. Measuring plate support plates 112 are fixedly mounted on the top ends of both measuring plates 113. The measuring plate support plates 112 are fixedly mounted on the rotating housing 111, which is rotatably disposed inside the insertion rod 109. A hollow shaft 106 is fixedly connected to the axial center of the rotating housing 111, and the top end of the hollow shaft 106 extends above the top end of the insertion rod 109. A threaded sleeve 103 is fixedly fitted onto the top end of the insertion rod 109. A gap is provided between the inner wall of the threaded sleeve 103 and the outer surface of the insertion rod 109, allowing the threaded tube 101 to be inserted. The threaded sleeve 103 is threaded onto the threaded tube 101, and a nut 102 is threaded onto the threaded tube 101, with the nut 102 engaging with the threaded sleeve 103. A swing cylinder 108 is movably mounted on the top of the threaded sleeve 103 or the insertion rod 109. A swing rod 107 is movably connected to the telescopic rod end of the swing cylinder 108. The end of the swing rod 107 away from the swing cylinder 108 is fixedly engaged with the hollow shaft 106. A top buckle plate 105 is fixedly mounted on the threaded sleeve 103. The swing rod 107 and the swing cylinder 108 are located inside the swing cylinder 108. The top of the hollow shaft 106 extends to the outside of the top buckle plate 105. The hollow shaft 106 is rotatably engaged with both the insertion rod 109 and the top buckle plate 105. Both heating chambers 116 are filled with kerosene. One of the heating chambers 116 is equipped with a heating wire for heating the kerosene, which is isolated from the kerosene. A movable reflector 121 is fixedly installed on the top of the inner wall of one of the measuring plates 113. A laser 118 is arranged diagonally above the movable reflector 121. The laser 118 is fixedly installed on the support side plate 117, which is fixedly installed on the measuring plate support plate 112. Multiple fixed reflectors 119 and a light sensor 120 are also fixedly installed on the support side plate 117. The light emitted by the laser 118 is reflected by the movable reflector 121 to the fixed reflector 119 closest to the laser 118. Then, through the cooperation of multiple fixed reflectors 119, the light is reflected to the light sensor 120 to extend the propagation path of the light.A conductive needle rod 130 is fixedly mounted on a gear 127, and the rotation axis of the conductive needle rod 130 is coaxial with that of the gear 127. The gear 127 is rotatably mounted on a gear bracket 126, which is slidably mounted on two parallel second slide rods 125. Two first slide rods 124 are arranged to the sides of the two second slide rods 125. The two first slide rods 124 and the two second slide rods 125 are all fixedly mounted on a measuring plate support plate 112. A rack 123 is fixedly mounted on the top of each telescopic piston rod 122. The two racks 123 are slidably mounted on the corresponding two first slide rods 124, and the opposing surfaces of the two racks 123 mesh with the gear 127. An arc-shaped resistance strip 128 is fixedly mounted on the gear bracket 126 via an arc-shaped resistance strip bracket 129. The center of the arc-shaped resistance strip 128 is concentric with the center of the conductive needle rod 130, and the arc-shaped resistance strip 128 and the conductive needle rod 130 are in a sliding conductive engagement. One end of the conductive needle 130, the conductive needle 130, and the protective resistor are connected in series in a DC circuit. By changing the position of the conductive needle 130 on the arc-shaped resistor bar 128, the current in the DC circuit is changed. The threaded tube 101 is part of the gas transmission pipe 104, wherein the threaded tube 101 is disposed on the outer surface of the gas transmission pipe 104, and the axis of the threaded tube 101 points to the center of the cross-section of the gas transmission pipe 104.

[0024] The working principle of the insertion-type gas mass flow meter disclosed in this invention is as follows: Based on the type of gas being transported in the gas transmission pipe 104, the position of the gas flow hole 110 inserted into the gas transmission pipe 104 is selected. Specifically, this is adjusted by rotating the threaded sleeve 103 (it is necessary to ensure that the measuring plate 113 is parallel to the gas flow direction, and the side of the measuring plate 113 without the tail guide plate 114 should be the windward side; that is, the threaded sleeve 103 can only be rotated in multiples of an integer). Then, the nut 102 is rotated so that the nut 102 abuts against the threaded sleeve 103. At this time, the threaded sleeve 103 is fixed on the threaded pipe 101. When the gas flows, the gas temperature is transferred to the heated chamber 116 inside the two measuring plates 113 (this can be done regardless of whether the gas is flowing). The heated chamber 116... When the kerosene inside is heated or cooled (depending on the ambient temperature at the time of installation), it will expand or contract. At this time, the telescopic piston rod 122 inside the telescopic cylinder 115 will extend or retract (taking extension as an example). Since the two heated chambers 116, the telescopic piston rod 122, and the telescopic cylinder 115 are identical, the extension and retraction of the two telescopic piston rods 122 are also the same. The two telescopic piston rods 122 will jointly drive the rack 123 to move, and the rack 123 will drive the gear 127 to move synchronously. Since there is no relative displacement between the two racks 123, the rack 123 will not rotate. At this time, the gear 127 will drive the gear bracket 126 to move synchronously. The gear bracket 126 slides on the second slide rod 125. When the kerosene inside the heated chamber 116 expands to a certain extent, the movement stops. Then, the heating wire inside one of the heated chambers 116 is activated to heat the kerosene. As a result, the corresponding telescopic piston rod 122 continues to extend, causing relative displacement between the two racks 123. The gear 127 rotates and drives the gear bracket 126 to slide on the second slide rod 125. At this time, the conductive needle rod 130 on the gear 127 slides on the arc-shaped resistance bar 128 (during this process, the heating wire continues to heat the kerosene). When the conductive needle rod 130 slides to the end of the arc-shaped resistance bar 128, the increase in the power of the heating wire stops and the power remains stable, so that the temperature of the kerosene neither rises nor falls. When the gas flows through the two measuring plates 113, it carries away the heat from the kerosene inside one of the heated chambers 116, which corresponds to the measuring plate 113. This causes the temperature of the heated chamber 116 inside the measuring plate 113 to decrease, and the temperature of the kerosene inside the heated chamber 116 to decrease. Consequently, the measuring plate support plate 112 will contract. At this time, there will be a relative displacement between the two racks 123, which will cause the gear 127 to rotate in the opposite direction. At this time, the conductive needle rod 130 will slide on the arc-shaped resistor bar 128, and the current in the corresponding circuit will change.The change in current is proportional to the change in kerosene temperature inside the heated cavity 116. Therefore, the change in temperature inside the heated cavity 116 can be determined by detecting the magnitude of the current in the DC circuit. The change in temperature inside the heated cavity 116 is related to the gas flow rate. The faster the flow rate, the more efficient the gas molecules are in contact with the measuring plate 113, and the faster the heat on the measuring plate 113 is carried away (given gas).

[0025] In addition, the swing cylinder 108 is controlled, and the extension rod of the swing cylinder 108 drives the swing rod 107 to swing. The swing rod 107 drives the hollow shaft rod 106 to swing. The hollow shaft rod 106 drives the rotating cover 111 to swing inside the insertion rod 109. The rotating cover 111 drives the two measuring plates 113 to swing inside the gas flow hole 110 through the measuring plate support plate 112. At this time, the flow direction of the two measuring plates 113 and the gas will change, which will cause the two measuring plates 113 to be pushed by the gas, thus causing the measuring plates 113 to deform. At this time, the moving reflector 12 installed inside the measuring plate 113... When the light source 118 is activated, the angle between the moving mirror 121 and the laser beam emitted by the laser 118 will change, thus changing the position of the light reflected from the moving mirror 121 onto the fixed mirror 119. Through the reflection of multiple fixed mirrors 119, the final position of the light beam hitting the light sensor 120 will change (extending the path and increasing sensitivity). By detecting the change in the light beam through the light sensor 120, the deformation of the measuring plate 113 can be determined (the measuring plate 113 is elastic and will recover on its own when no force is applied). The deformation of the measuring plate 113 is proportional to the gas flow rate (the gas is known).

Claims

1. An insertion-type gas mass flow meter, characterized in that: Includes an insertion rod (109), with a gas flow hole (110) at the bottom of the insertion rod (109). Inside the gas flow hole (110) are two symmetrically and parallelly arranged measuring plates (113), and a tail guide plate (114) is fixedly installed on each of the two measuring plates (113). Each measuring plate (113) is hollow inside. A heated cavity (116) is fixedly embedded in the cavity inside the measuring plate (113). A telescopic cylinder (115) is fixedly connected to each heated cavity (116). A telescopic piston rod (122) is slidably sealed inside each telescopic cylinder (115). The two telescopic piston rods (122) drive the conductive needle rod (130) to rotate together. The top ends of the two measuring plates (113) are fixedly installed on the measuring plate support plate (112), the measuring plate support plate (112) is fixedly installed on the rotating cover (111), the rotating cover (111) is rotatably set inside the insertion rod (109), and a hollow shaft (106) is fixedly connected to the axial position on the rotating cover (111), the top end of the hollow shaft (106) extends to the top end of the insertion rod (109); The top end of the insertion rod (109) is fixedly fitted with a threaded sleeve (103), and the top end of the threaded sleeve (103) or the insertion rod (109) is movably mounted with a swing electric cylinder (108). The telescopic rod end of the swing electric cylinder (108) is movably connected with a swing rod (107), and the end of the swing rod (107) away from the swing electric cylinder (108) is fixedly engaged with the hollow shaft rod (106). Both heating chambers (116) are filled with kerosene. One of the heating chambers (116) is equipped with a heating wire for heating the kerosene, which is isolated from the kerosene. A movable reflector (121) is fixedly installed on the top of the inner wall of one of the measuring plates (113). A laser (118) is set diagonally above the movable reflector (121). The laser (118) is fixedly installed on the support side plate (117). The support side plate (117) is fixedly installed on the measuring plate support plate (112). Multiple fixed reflectors (119) and a light sensor (120) are also fixedly installed on the support side plate (117). The light emitted by the laser (118) is reflected by the movable reflector (121) to the fixed reflector (119) closest to the laser (118). Then, through the cooperation of multiple fixed reflectors (119), the light is reflected to the light sensor (120) to extend the propagation path of the light.

2. The insertion-type gas mass flow meter according to claim 1, characterized in that: A gap is provided between the inner wall of the threaded sleeve (103) and the outer surface of the insertion rod (109), which allows the threaded tube (101) to be inserted. The threaded sleeve (103) can be threaded onto the threaded tube (101), and a nut (102) is also threaded onto the threaded tube (101). The nut (102) and the threaded sleeve (103) abut against each other.

3. The insertion-type gas mass flow meter according to claim 2, characterized in that: A top buckle plate (105) is fixedly installed on the threaded sleeve (103). The swing rod (107) and the swing electric cylinder (108) are located inside the swing electric cylinder (108). The top end of the hollow shaft (106) extends to the outside of the top buckle plate (105).

4. An insertion-type gas mass flow meter according to claim 3, characterized in that: The hollow shaft (106) is rotatably fitted with the insertion rod (109) and the top buckle (105).

5. An insertion-type gas mass flow meter according to claim 4, characterized in that: The conductive needle rod (130) is fixedly mounted on the gear (127), and the rotation axis of the conductive needle rod (130) is coaxial with the gear (127). The gear (127) is rotatably mounted on the gear bracket (126). The gear bracket (126) is slidably mounted on two parallel second slide rods (125). Two first slide rods (124) are arranged on the sides of the two second slide rods (125). The two first slide rods (124) and the two second slide rods (125) are all fixedly mounted on the measuring plate support plate (112).

6. An insertion-type gas mass flow meter according to claim 5, characterized in that: Each telescopic piston rod (122) has a rack (123) fixedly installed at its top end. The two racks (123) are slidably installed on the corresponding two first slide rods (124), and the opposite surfaces of the two racks (123) mesh with the gear (127).

7. An insertion-type gas mass flow meter according to claim 6, characterized in that: The gear bracket (126) is fixedly mounted on the arc-shaped resistor bar (128) via the arc-shaped resistor bar bracket (129). The center of the arc-shaped resistor bar (128) is concentric with the center of the conductive needle bar (130), and the arc-shaped resistor bar (128) and the conductive needle bar (130) are in sliding conductive engagement.

8. An insertion-type gas mass flow meter according to claim 7, characterized in that: One end of the arc-shaped resistor bar (128), the conductive needle rod (130), and the protective resistor are connected in series in a DC circuit. By changing the position of the conductive needle rod (130) on the arc-shaped resistor bar (128), the current in the DC circuit can be changed.

9. An insertion-type gas mass flow meter according to claim 8, characterized in that: The threaded tube (101) is part of the gas transmission pipe (104), wherein the threaded tube (101) is disposed on the outer surface of the gas transmission pipe (104), and the axis of the threaded tube (101) points to the center of the cross-section of the gas transmission pipe (104).

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