Plug-in type gas mass flow meter

Abstract

The invention discloses a plug-in type gas mass flow meter, and relates to the technical field of flow meters. The device comprises an insertion rod, a measuring plate and a transmission mechanism. The insertion rod is fixed to the gas transmission pipeline through a threaded sleeve, a heated cavity is formed in the measuring plate, the kerosene temperature difference is used for driving the telescopic piston rod, the gear and the conductive needle rod are driven to slide on the arc-shaped resistor strip, and the circuit current is changed to reflect the flow speed. Meanwhile, the measuring plate deformation detects the light position change through a laser and a multi-reflector system, and double flow velocity measurement is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of flow meters, in particular to an insertion type gas mass flow meter. Background Art

[0002] The gas mass flowmeters in the prior art mainly include differential pressure flowmeters and vortex flowmeters. The differential pressure flowmeter uses the pressure difference in the pipeline to calculate the flow rate, while the vortex flowmeter detects the flow velocity based on the vortex frequency. However, these ordinary flowmeters have many shortcomings. First, the differential pressure type is easily disturbed by pipeline vibration at high flow rates, and the vortex type responds slowly to pulsating flow, resulting in distortion of instantaneous flow data. In addition, ordinary flowmeters mostly use a single measurement principle. Once the core component fails, the entire system fails and the reliability is insufficient. Traditional flowmeters have a complex structure, and the external sensors or probes are exposed to the gas, which are susceptible to corrosion or mechanical wear, poor durability, and high maintenance costs. These defects make ordinary flowmeters perform poorly in high-precision, multi-condition applications. Summary of the invention

[0003] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: an insertion type gas mass flow meter, comprising an insertion rod, a gas flow hole is opened at the bottom of the insertion rod, two symmetrical and parallel measuring plates are arranged inside the gas flow hole, and tail guide plates are fixedly installed on the two measuring plates; each measuring plate is hollow inside, and a heat-receiving cavity is fixedly embedded in the cavity inside the measuring plate, each heat-receiving cavity is fixedly connected with a telescopic cylinder, and a telescopic piston rod is slidingly sealed in each telescopic cylinder, and the two telescopic piston rods jointly drive the conductive needle rod to rotate; the top ends of the two measuring plates are fixedly installed with measuring plate support plates, and the measuring plate support plates are fixedly installed on the rotating cover shell, and the rotating cover shell is rotatably set inside the insertion rod, and a hollow shaft rod is fixedly connected at the axis position on the rotating cover shell, and the top end of the hollow shaft rod extends to above the top end of the insertion rod.

[0004] Preferably, the top fixing sleeve of the insertion rod is provided with a threaded sleeve, and a gap is provided between the inner wall of the threaded sleeve and the outer surface of the insertion rod, so that the threaded tube can be inserted into the gap, wherein the threaded sleeve can be threadedly sleeved on the threaded tube, and a nut is also threadedly sleeved on the threaded tube, and the nut and the threaded sleeve are in abutment with each other.

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

[0006] Preferably, the hollow shaft rod is rotatably engaged with both the insertion rod and the top buckle plate; kerosene is provided inside both of the two heat-receiving cavities, and a heating wire for heating the kerosene is provided inside one of the heat-receiving cavities, and the heating wire is arranged in isolation from the kerosene.

[0007] Preferably, a movable reflecting mirror is fixedly installed at the top of the inner wall of one of the measuring plates. A laser is provided obliquely above the movable reflecting mirror. The laser is fixedly installed on the supporting side plate, and the supporting side plate is fixedly installed on the measuring plate support plate. A plurality of fixed reflecting mirrors and a light sensor are also fixedly installed on the supporting side plate. The light emitted by the laser is reflected by the movable reflecting mirror to the fixed reflecting mirror closest to the laser, and then through the cooperation of the plurality of fixed reflecting mirrors, the light is reflected to the light sensor to extend the propagation path of the light.

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

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

[0010] Preferably, an arc-shaped resistance bar is fixedly installed on the gear bracket through an arc-shaped resistance bar bracket in an overhead manner. The center of the arc-shaped resistance bar is concentric with the center of the conductive needle rod, and the arc-shaped resistance bar is in sliding conductive cooperation with the conductive needle rod.

[0011] Preferably, one end of the conductive needle rod, the conductive needle rod and the protection resistor are connected in series in a DC circuit, and the magnitude of the current in the DC circuit is changed by changing the position of the conductive needle rod on the arc-shaped resistance bar.

[0012] Preferably, the threaded pipe is a part of the gas transmission pipeline. The threaded pipe is arranged on the outer surface of the gas transmission pipeline, and the axis of the threaded pipe points to the center of the cross-section of the gas transmission pipeline.

[0013] The present invention has the following beneficial effects compared with the prior art: (1) By means of the double measuring plates and the temperature difference of kerosene in the heat receiving cavity, the telescopic piston rod is used to drive the gear and the conductive needle rod to slide on the arc-shaped resistance strip, and the circuit current is accurately adjusted to reflect the flow rate. The cooperative action of the double plates combined with the rack and gear transmission ensures reliable data can still be provided in a complex environment; (2) The present invention adjusts the angle of the measuring plate in cooperation with the swinging electric cylinder and the rotating housing, and uses the optical system composed of a laser, a moving reflecting mirror and multiple fixed reflecting mirrors to extend the optical path to detect the deformation of the measuring plate, and captures the minute changes through a light sensor. This highly sensitive 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 the flow rate is reflected by the changes in current and light respectively. Even if one system fails, the other system can still operate. Compared with the disadvantage that ordinary flow meters are prone to complete failure in a single mode, the reliability of the equipment is greatly improved, and data mutual calibration is achieved; (4) The arc-shaped resistance strip and the conductive needle rod of the present invention are integrated inside the rotating housing, so that they cannot be directly contacted with the gas, achieving isolation to avoid corrosion, reducing the maintenance cost and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the installation position of the present invention.

[0015] Figure 2 It is a schematic structural diagram of the whole of the present invention.

[0016] Figure 3 It is a schematic structural diagram of the gas flow hole of the present invention.

[0017] Figure 4 It is a schematic structural diagram of the rotating housing of the present invention.

[0018] Figure 5 For the present invention Figure 4 The schematic structural diagram at position A.

[0019] Figure 6 It is a schematic structural diagram of the fixed reflecting mirror of the present invention.

[0020] Figure 7 It is a schematic structural diagram of the heat receiving cavity of the present invention.

[0021] In the figure: 101 - threaded pipe; 102 - nut; 103 - threaded sleeve; 104 - gas transmission pipeline; 105 - top buckle plate; 106 - hollow shaft rod; 107 - swing rod; 108 - swing electric cylinder; 109 - insertion rod; 110 - gas flow hole; 111 - rotating housing; 112 - measuring plate support plate; 113 - measuring plate; 114 - tail deflector; 115 - telescopic cylinder; 116 - heat receiving cavity; 117 - support side plate; 118 - laser; 119 - fixed reflector; 120 - light sensor; 121 - moving reflector; 122 - telescopic piston rod; 123 - rack; 124 - first slide bar; 125 - second slide bar; 126 - gear support; 127 - gear; 128 - arc resistance strip; 129 - arc resistance strip support; 130 - conductive needle rod. Detailed implementation manners

[0022] The following combines the attached Figures 1-7 drawings, and further illustrates the technical solution of the present invention through specific implementation manners.

[0023] The present invention provides an insertion type gas mass flowmeter, which includes an insertion rod 109. A gas flow hole 110 is opened at the bottom of the insertion rod 109. Inside the gas flow hole 110, two symmetrically and parallelly arranged measuring plates 113 are provided. Tail guide plates 114 are fixedly installed on both of the two measuring plates 113; each measuring plate 113 is hollow inside, and a heat receiving cavity 116 is fixedly embedded in the cavity inside the measuring plate 113. A telescopic cylinder 115 is fixedly communicated with each heat receiving cavity 116. A telescopic piston rod 122 is slidably and sealingly arranged in each telescopic cylinder 115, and the two telescopic piston rods 122 jointly drive a conductive needle rod 130 to rotate; the tops of the two measuring plates 113 are fixedly installed on a measuring plate support plate 112, and the measuring plate support plate 112 is fixedly installed on a rotating housing 111. The rotating housing 111 is rotatably arranged inside the insertion rod 109. A hollow shaft rod 106 is fixedly communicated with the axial center position of the rotating housing 111, and the top end of the hollow shaft rod 106 extends above the top end of the insertion rod 109. A threaded sleeve 103 is fixedly sleeved on the top end of the insertion rod 109. There is a gap between the inner wall of the threaded sleeve 103 and the outer surface of the insertion rod 109, and a threaded tube 101 can be inserted into this gap, wherein the threaded sleeve 103 can be threadedly sleeved on the threaded tube 101, and a nut 102 is also threadedly sleeved on the threaded tube 101, and the nut 102 is in abutting cooperation with the threaded sleeve 103. A swing electric cylinder 108 is movably installed at the top end of the threaded sleeve 103 or the insertion rod 109. The end of the telescopic rod of the swing electric cylinder 108 is movably connected with a swing rod 107. The end of the swing rod 107 far away from the swing electric cylinder 108 is fixedly matched with the hollow shaft rod 106. A top buckle plate 105 is fixedly installed on the threaded sleeve 103. The swing rod 107 and the swing electric cylinder 108 are arranged inside the swing electric cylinder 108, and the top end of the hollow shaft rod 106 extends outside the top buckle plate 105. Among them, the hollow shaft rod 106 is rotatably matched with both the insertion rod 109 and the top buckle plate 105; kerosene is provided inside both of the two heat receiving cavities 116, and a heating wire for heating the kerosene is provided inside one of the heat receiving cavities 116, and the heating wire is isolated from the kerosene. A moving reflecting mirror 121 is fixedly installed at the top of the inner wall of one of the measuring plates 113. A laser 118 is arranged obliquely above the moving reflecting mirror 121. The laser 118 is fixedly installed on a support side plate 117, the support side plate 117 is fixedly installed on the measuring plate support plate 112, and a plurality of fixed reflecting mirrors 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 to the fixed reflecting mirror 119 closest to the laser 118 through the moving reflecting mirror 121, and then through the cooperation of the plurality of fixed reflecting mirrors 119, the light is reflected to the light sensor 120 to extend the propagation path of the light.The conductive needle rod 130 is fixedly installed on the gear 127, and the rotation axis of the conductive needle rod 130 is coaxially arranged with the gear 127. The gear 127 is rotatably installed on the gear bracket 126, and the gear bracket 126 is slidably installed 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 installed on the measuring plate support plate 112. The top end of each telescopic piston rod 122 is fixedly installed with a rack 123. The two racks 123 are respectively slidably installed on the corresponding two first slide rods 124, and the opposite surfaces of the two racks 123 are meshed with the gear 127. An arc-shaped resistance bar 128 is fixedly installed on the gear bracket 126 through an arc-shaped resistance bar bracket 129 in an overhead manner. The center of the arc-shaped resistance bar 128 is concentric with the center of the conductive needle rod 130. The arc-shaped resistance bar 128 is in sliding conductive cooperation with the conductive needle rod 130. One end of the conductive needle rod 130, the conductive needle rod 130 and the protection resistor are connected in series in a DC circuit. By changing the position of the conductive needle rod 130 on the arc-shaped resistance bar 128, the magnitude of the current in the DC circuit is changed. The threaded pipe 101 is a part of the gas transmission pipe 104. The threaded pipe 101 is arranged on the outer surface of the gas transmission pipe 104, and the axis of the threaded pipe 101 points to the center of the cross-section of the gas transmission pipe 104.

[0024] The working principle of an insertion type gas mass flow meter disclosed in the present invention is as follows: according to the type of gas transmitted in the gas transmission pipeline 104, the gas flow hole 110 is selected to be inserted into the position inside the gas transmission pipeline 104, and is specifically adjusted by rotating the threaded sleeve 103 (it is necessary to ensure that the measuring plate 113 is parallel to the flow direction of the gas, 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 an integer multiple of times), and then the nut 102 is rotated so that the nut 102 conflicts with the threaded sleeve 103. At this time, the threaded sleeve 103 will be fixed on the threaded pipe 101. When the gas circulates, the temperature of the gas will be transmitted to the heated cavity 116 inside the two measuring plates 113 (it doesn't matter whether the gas is flowing at this time). The heated cavity 116 The kerosene inside will expand or contract after being heated or cooled (depending on the ambient temperature during installation), and the telescopic piston rod 122 inside the telescopic cylinder 115 will extend or contract (taking extension as an example at this time). Since the two heated cavities 116, the telescopic piston rod 122, and the telescopic cylinder 115 are exactly the same, the extension and contraction amounts 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, and the gear bracket 126 slides on the second slide rod 125. When the kerosene inside the heated cavity 116 expands to a certain extent, the movement stops. Then, the heating wire inside one of the heated cavities 116 is started, and the heating wire heats the kerosene, so the corresponding telescopic piston rod 122 will continue to extend, resulting in relative displacement between the two racks 123, and the gear 127 will rotate, and will also drive the gear bracket 126 to slide on the second slide bar 125. At this time, the conductive needle rod 130 on the gear 127 will slide on the arc-shaped resistor bar 128 (the heating wire keeps heating the kerosene during this process). When the conductive needle rod 130 slides to the end of the arc-shaped resistor bar 128, the power increase of the heating wire is stopped and the power is kept stable, so that the temperature of the kerosene no longer rises or falls. When the gas flows through the two measuring plates 113, it will take away the heat of the kerosene on the corresponding measuring plate 113 inside one of the heated cavities 116, thereby causing the temperature of the heated cavity 116 inside the measuring plate 113 to decrease. The temperature of the kerosene inside the heated cavity 116 will decrease, and the corresponding measuring plate support plate 112 will shrink. At this time, relative displacement will occur between the two racks 123, causing 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 the temperature of the kerosene inside the heated heat-receiving cavity 116. Therefore, by detecting the magnitude of the current in the DC circuit, the change in the temperature inside the heated heat-receiving cavity 116 can be known. The change in the temperature inside the heated heat-receiving cavity 116 is related to the gas flow rate. The faster the flow rate, the higher the efficiency of gas molecules contacting the measurement plate 113, and thus the faster the temperature on the measurement plate 113 is carried away (known gas).

[0025] In addition, by controlling the swing cylinder 108, the telescopic 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 housing 111 to swing inside the insertion rod 109. The rotating housing 111 drives the two measurement plates 113 to swing inside the gas flow hole 110 through the measurement plate support plate 112. At this time, the flow direction of the two measurement plates 113 and the gas will change, which will cause the two measurement plates 113 to be pushed by the gas, resulting in deformation of the measurement plates 113. At this time, the movable reflecting mirror 121 provided inside the measurement plate 113 will swing, and the angle between the movable reflecting mirror 121 and the light emitted by the laser 118 will change, resulting in a change in the position of the light reflected by the movable reflecting mirror 121 onto the fixed reflecting mirror 119. Through the reflection of multiple fixed reflecting mirrors 119, the position of the light finally hitting the light sensor 120 changes (extending the path and improving the sensitivity). By detecting the change in the light by the light sensor 120, the deformation of the measurement plate 113 can be known (the measurement plate 113 is elastic and will recover by itself when not stressed), and the deformation of the measurement plate 113 is proportional to the gas flow rate (known gas).

Claims

1. An insertion type gas mass flowmeter, characterized in that: It includes an insertion rod (109). Gas circulation holes (110) are provided at the bottom of the insertion rod (109). Inside the gas circulation holes (110), there are two symmetrically and parallelly arranged measuring plates (113). Tail guide plates (114) are fixedly installed on both of the two measuring plates (113). Each measuring plate (113) is hollow inside. Heat-receiving cavities (116) are fixedly embedded in the cavities inside the measuring plates (113). Each heat-receiving cavity (116) is fixedly communicated with a telescopic cylinder (115). Telescopic piston rods (122) are slidably and sealingly arranged inside each telescopic cylinder (115). The two telescopic piston rods (122) jointly drive a conductive needle rod (130) to rotate. At the top ends of the two measuring plates (113), there are fixedly installed on measuring plate support plates (112). The measuring plate support plates (112) are fixedly installed on a rotating housing (111). The rotating housing (111) is rotatably arranged inside the insertion rod (109). At the axial center position of the rotating housing (111), there is a fixedly communicated hollow shaft rod (106). The top end of the hollow shaft rod (106) extends above the top end of the insertion rod (109).

2. The insertion type gas mass flowmeter according to claim 1, characterized in that: A threaded sleeve (103) is fixedly sleeved at the top end of the insertion rod (109). There is a gap between the inner wall of the threaded sleeve (103) and the outer surface of the insertion rod (109). A threaded pipe (101) can be inserted into this gap. The threaded sleeve (103) can be threadedly sleeved on the threaded pipe (101). A nut (102) is also threadedly sleeved on the threaded pipe (101). The nut (102) is in abutting cooperation with the threaded sleeve (103).

3. The insertion type gas mass flowmeter according to claim 2, characterized in that: A swing electric cylinder (108) is movably installed at the top end of the threaded sleeve (103) or the insertion rod (109). The end of the telescopic rod of the swing electric cylinder (108) is movably connected to a swing rod (107). The end of the swing rod (107) away from the swing electric cylinder (108) is fixedly fitted with the hollow shaft rod (106). A top buckle plate (105) is fixedly installed on the threaded sleeve (103). The swing rod (107) and the swing electric cylinder (108) are arranged inside the swing electric cylinder (108). The top end of the hollow shaft rod (106) extends outside the top buckle plate (105).

4. The insertion type gas mass flowmeter according to claim 3, characterized in that: The hollow shaft rod (106) is rotatably fitted with both the insertion rod (109) and the top buckle plate (105). Kerosene is provided inside both of the two heat-receiving cavities (116). A heating wire for heating the kerosene is provided inside one of the heat-receiving cavities (116). The heating wire is isolated from the kerosene.

5. The insertion type gas mass flowmeter according to claim 4, wherein: On the top of the inner wall of one of the measuring plates (113), a movable reflecting mirror (121) is fixedly installed. Above the inclined position of the movable reflecting mirror (121), a laser (118) is provided. The laser (118) is fixedly installed on the supporting side plate (117), and the supporting side plate (117) is fixedly installed on the measuring plate support plate (112). On the supporting side plate (117), a plurality of fixed reflecting mirrors (119) and a light sensor (120) are also fixedly installed. The light emitted by the laser (118) is reflected by the movable reflecting mirror (121) to the fixed reflecting mirror (119) closest to the laser (118), and then through the cooperation of the plurality of fixed reflecting mirrors (119), the light is reflected to the light sensor (120) to extend the propagation path of the light.

6. The insertion type gas mass flowmeter according to claim 5, wherein: The conductive needle rod (130) is fixedly installed on the gear (127), and the rotation axis of the conductive needle rod (130) is coaxially arranged with the gear (127). The gear (127) is rotatably installed on the gear bracket (126), and the gear bracket (126) is slidably installed on two parallel second slide rods (125). On the sides of the two second slide rods (125), two first slide rods (124) are provided. The two first slide rods (124) and the two second slide rods (125) are all fixedly installed on the measuring plate support plate (112).

7. The insertion type gas mass flowmeter according to claim 6, characterized in that: At the top end of each telescopic piston rod (122), a rack (123) is fixedly installed. The two racks (123) are respectively slidably installed on the corresponding two first slide rods (124), and the opposite surfaces of the two racks (123) are meshed with the gear (127).

8. The insertion type gas mass flowmeter according to claim 7, characterized in that: On the gear bracket (126), an arc-shaped resistance strip (128) is fixedly installed overhead through 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). The arc-shaped resistance strip (128) is in sliding conductive cooperation with the conductive needle rod (130).

9. The insertion type gas mass flowmeter according to claim 8, wherein: One end of the conductive needle rod (130), the conductive needle rod (130) and the protection resistor are connected in series in a DC circuit. By changing the position of the conductive needle rod (130) on the arc-shaped resistance strip (128), the magnitude of the current in the DC circuit is changed.

10. The insertion type gas mass flowmeter according to claim 9, characterized in that: The threaded tube (101) is a part of the gas transmission pipeline (104). The threaded tube (101) is arranged on the outer surface of the gas transmission pipeline (104), and the axis of the threaded tube (101) points to the center of the cross-section of the gas transmission pipeline (104).

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