A multifunctional piston flow meter

Abstract

The present invention discloses a multifunctional piston flowmeter, which relates to the technical field of fluid flow. The present invention provides an axially movable measuring cylinder, which can measure the flow of the fluid without providing an overly large movable part in the measuring pipeline; adopts three measuring methods, which can effectively ensure the stability of the measurement data, and comprehensively judge the flow of the fluid through three sets of measurement data to obtain more reliable flow data; when measuring a low-speed flowing fluid, more accurate measurement data can be obtained, and at the same time, a high-speed flowing fluid can be measured, achieving a very wide measurement range.

Description

Technical Field

[0001] The invention relates to the technical field of fluid flow, in particular to a multifunctional piston flow meter. Background Art

[0002] The advantages of piston flowmeters are simple structure, reliable operation, high measurement accuracy, and good adaptability to fluids with high viscosity. However, with the development of science and technology and the continuous improvement of industrial measurement needs, traditional piston flowmeters have gradually exposed some limitations. For example, their measurement range is narrow and the measurement effect of gas flow is not good.

[0003] Currently in the prior art, there is an invention patent with publication number CN113447090A, which discloses a rotary piston water flow meter. The buoyancy of the piston can reduce friction and noise in the flow meter to obtain more accurate fluid flow measurement. However, when facing high-speed flowing fluid, it is used for jitter problems, and after long-term work, it will wear out and require regular maintenance. Summary of the invention

[0004] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: a multifunctional piston flowmeter, comprising a measuring pipe, both ends of the measuring pipe are fixedly installed with flanges, the inner wall of the measuring pipe is slidably installed with a measuring cylinder through a measuring cylinder sliding frame, one end of the measuring cylinder is fixedly installed with a sealing side plate, and a piston rod is fixedly installed on the sealing side plate, and a detection piston cylinder is also fixedly installed on the inner wall of the measuring pipe through a detection piston cylinder bracket, a piston rod sleeve is fixedly installed on the bottom end of the detection piston cylinder, the inner wall of the piston rod sleeve is slidably matched with the piston rod piston, a detection piston is slidably installed on the inner wall of the detection piston cylinder, and a guide rod is fixedly installed on the detection piston A Hall sensor and a monitoring unit for monitoring the displacement size of the measuring cylinder are also fixedly installed on the outer surface of the measuring pipeline; the monitoring unit includes a detection rack bracket and an auxiliary gear bracket fixed to the measuring pipeline, a detection rack is slidably installed on the detection rack bracket, a resistance bar is arranged on the surface of the detection rack, a sliding brush that slidably cooperates with the resistance bar is fixedly provided on the auxiliary gear bracket, one end of the detection rack is movably connected to the top end of the guide rod through a movable connecting rod, and the other end of the detection rack is movably connected to a tension spring connecting frame, a spirally arranged tension spring is fixedly installed on the tension spring connecting frame, and one end of the tension spring away from the tension spring connecting frame is fixed to the measuring pipeline through a tension spring support block.

[0005] Preferably, a partition plate is provided on the inner wall of the measuring cylinder for dividing the interior of the measuring cylinder into two chambers, and a through hole is provided on the partition plate, a screw rod is slidably installed at the axial position of the partition plate, a diverter cover is fixedly installed at one end of the screw rod, and the diverter cover is slidably matched with the inner wall of the measuring cylinder.

[0006] Preferably, two sliding support rods arranged parallel to the screw rod are fixedly installed on the diverter cover, the sliding support rods are slidably matched with the partition plate, and a nut gear is rotatably installed on the side of the partition plate away from the diverter cover, and the nut gear is threadedly matched with the screw rod. An adjusting motor is also fixedly installed on the inner wall of the measuring cylinder, and an adjusting driving gear that meshes with the nut gear is fixedly installed on the output shaft of the adjusting motor.

[0007] Preferably, the piston rod is provided with a pressure relief port, and a limiting slide rod support ring is fixedly installed on one end of the piston rod sleeve close to the sealing side plate, a limiting slide rod is slidably installed on the limiting slide rod support ring, one end of the limiting slide rod is fixedly installed on the sealing side plate, and a limiting baffle is provided on the other end of the limiting slide rod to prevent the piston rod from being pulled out of the piston rod sleeve.

[0008] Preferably, the guide rod is also slidably mounted on a guide rod reinforcement sliding frame, the guide rod reinforcement sliding frame is fixedly mounted on the measuring pipe, and a shielding cover fixedly matched with the measuring pipe is also provided on the outer side of the detection rack.

[0009] Preferably, an auxiliary gear that meshes with the detection rack for transmission is rotatably mounted on the auxiliary gear bracket, a barrel rack is fixedly mounted on the side of the auxiliary gear bracket, an auxiliary motor is fixedly mounted on the barrel rack, an auxiliary friction sleeve is rotatably mounted on the inner wall of the barrel rack, and the auxiliary friction sleeve is fixedly mounted on the output shaft of the auxiliary motor.

[0010] Preferably, a lever support plate is rotatably mounted on the auxiliary gear bracket, and the lever support plate and the auxiliary gear are fixed as a whole through a rotating shaft. An auxiliary rotating block is rotatably mounted in the auxiliary friction sleeve, and the auxiliary rotating block is provided with two symmetrically arranged inclined surfaces, each inclined surface is overlapped with an auxiliary friction column, and the auxiliary rotating block is also provided with two symmetrically arranged supporting surfaces, and an arc leaf spring is provided between the supporting surface and the auxiliary friction column.

[0011] Preferably, the surface of each auxiliary friction column is in contact with a shifting rod, a movable gap is provided between the shifting rod and the inclined surface, and all the shifting rods are fixedly mounted on the shifting rod support plate.

[0012] Compared with the prior art, the present invention has the following advantages: (1) The axially movable measuring cylinder provided in the present invention can measure the flow rate of the fluid without providing excessively large moving parts in the measuring pipeline; (2) The present invention adopts three measurement methods, which can effectively ensure the stability of the measurement data, and comprehensively judge the flow rate of the fluid through three sets of measurement data to obtain more reliable flow data; (3) The present invention can obtain more accurate measurement data when measuring low-speed flowing fluids, and can also measure high-speed flowing fluids, thereby achieving a very wide measurement range. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the external structure of the measuring pipeline of the present invention.

[0014] Figure 2 This is a schematic diagram of the internal structure of the measuring pipeline of the present invention.

[0015] Figure 3 It is a schematic diagram of the measuring cylinder structure of the present invention.

[0016] Figure 4 It is a schematic diagram of the internal structure of the shielding cover of the present invention.

[0017] Figure 5 This is a diagram of the installation position of the Hall sensor of the present invention.

[0018] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at point A in the middle.

[0019] Figure 7 It is a schematic diagram of the cartridge frame structure of the present invention.

[0020] Figure 8 It is a schematic diagram of the structure of the auxiliary friction sleeve of the present invention.

[0021] Fig. 9 It is a schematic diagram of the structure of the auxiliary rotating block of the present invention.

[0022] Fig.10 For the present invention Fig. 9 Schematic diagram of the structure at point B in the middle.

[0023] Fig.11 It is a structural schematic diagram of the lever support plate of the present invention.

[0024] In the figure: 101-measuring pipe; 102-Hall sensor; 103-measuring cylinder sliding frame; 104-measuring cylinder; 1041-partition plate; 105-dividing cover; 106-sliding support rod; 107-screw rod; 108-nut gear; 109-adjusting driving gear; 110-adjusting motor; 111-sealing side plate; 112-piston rod; 1121-pressure relief port; 113-limiting slide rod; 114-limiting slide rod support ring; 115-piston rod sleeve; 116-detection piston cylinder; 117-detection piston; 118-guide rod; 119-detection piston cylinder bracket ;120-guide rod reinforced sliding frame;201-detection rack bracket;202-detection rack;203-moving connecting rod;204-auxiliary gear;205-auxiliary gear bracket;206-sliding brush;207-tension spring connecting frame;208-tension spring;209-tension spring support block;210-shielding cover;211-cylinder frame;212-auxiliary motor;213-auxiliary friction sleeve;214-auxiliary rotating block;2141-inclined surface;2142-supporting surface;215-shift lever support plate;216-shift lever;217-auxiliary friction column;218-arc leaf spring;3-flange. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-11 , and further illustrate the technical solution of the present invention through specific implementation methods.

[0026] The present invention provides a multifunctional piston flowmeter, comprising a measuring pipeline 101, both ends of which are fixedly installed with flanges 3, an inner wall of the measuring pipeline 101 is slidably installed with a measuring cylinder 104 through a measuring cylinder sliding frame 103, one end of the measuring cylinder 104 is fixedly installed with a sealing side plate 111, a piston rod 112 is fixedly installed on the sealing side plate 111, a detection piston cylinder 116 is also fixedly installed on the inner wall of the measuring pipeline 101 through a detection piston cylinder bracket 119, a piston rod sleeve 115 is fixedly installed on the bottom end of the detection piston cylinder 116, the inner wall of the piston rod sleeve 115 is slidably matched with the piston rod 112, a detection piston 117 is slidably installed on the inner wall of the detection piston cylinder 116, a guide rod 118 is fixedly installed on the detection piston 117, and a Hall sensor 102 and a monitoring unit for monitoring the displacement size of the measuring cylinder 104 are also fixedly installed on the outer surface of the measuring pipeline 101. A partition plate 1041 is provided on the inner wall of the measuring cylinder 104, which is used to divide the inside of the measuring cylinder 104 into two chambers, and a through hole is provided on the partition plate 1041. A screw rod 107 is slidably installed at the axial position of the partition plate 1041, and a flow divider 105 is fixedly installed at one end of the screw rod 107. The flow divider 105 is slidably matched with the inner wall of the measuring cylinder 104. Two sliding support rods 106 arranged parallel to the screw rod 107 are also fixedly installed on the flow divider 105. The sliding support rods 106 are slidably matched with the partition plate 1041. A nut gear 108 is rotatably installed on the side of the partition plate 1041 away from the flow divider 105. The nut gear 108 is threadedly matched with the screw rod 107. An adjusting motor 110 is also fixedly installed on the inner wall of the measuring cylinder 104, and an adjusting driving gear 109 meshing with the nut gear 108 is fixedly installed on the output shaft of the adjusting motor 110. The piston rod 112 is provided with a pressure relief port 1121, and a limit slide support ring 114 is fixedly installed at one end of the piston rod sleeve 115 close to the sealing side plate 111, and a limit slide 113 is slidably installed on the limit slide support ring 114, one end of the limit slide 113 is fixedly installed on the sealing side plate 111, and a limit stopper is provided at the other end of the limit slide 113 to prevent the piston rod 112 from being withdrawn from the piston rod sleeve 115. The guide rod 118 is also slidably installed on the guide rod reinforcement slide frame 120, and the guide rod reinforcement slide frame 120 is fixedly installed on the measuring pipe 101, and a shielding cover 210 fixedly matched with the measuring pipe 101 is also provided on the outer side of the detection rack 202.

[0027] The monitoring part includes a detection rack bracket 201 and an auxiliary gear bracket 205 fixed to the measuring pipe 101, a detection rack 202 is slidably mounted on the detection rack bracket 201, a resistance bar is arranged on the surface of the detection rack 202, and a sliding brush 206 which slidably cooperates with the resistance bar is fixedly provided on the auxiliary gear bracket 205, one end of the detection rack 202 is movably connected to the top end of the guide rod 118 through a movable connecting rod 203, and the other end of the detection rack 202 is movably connected to a tension spring connecting frame 207, a spiral tension spring 208 is fixedly mounted on the tension spring connecting frame 207, and the end of the tension spring 208 away from the tension spring connecting frame 207 is fixed to the measuring pipe 101 through a tension spring support block 209. An auxiliary gear 204 meshing with the detection rack 202 is rotatably mounted on the auxiliary gear bracket 205, a cartridge frame 211 is fixedly mounted on the side of the auxiliary gear bracket 205, an auxiliary motor 212 is fixedly mounted on the cartridge frame 211, an auxiliary friction sleeve 213 is rotatably mounted on the inner wall of the cartridge frame 211, and the auxiliary friction sleeve 213 is fixedly mounted on the output shaft of the auxiliary motor 212. A lever support plate 215 is also rotatably mounted on the auxiliary gear bracket 205, the lever support plate 215 and the auxiliary gear 204 are fixed as a whole through a rotating shaft, an auxiliary rotating block 214 is rotatably mounted in the auxiliary friction sleeve 213, the auxiliary rotating block 214 is provided with two symmetrically arranged inclined surfaces 2141, each inclined surface 2141 is overlapped with an auxiliary friction column 217, and the auxiliary rotating block 214 is also provided with two symmetrically arranged supporting surfaces 2142, and an arc leaf spring 218 is arranged between the supporting surface 2142 and the auxiliary friction column 217. The surface of each auxiliary friction column 217 is in contact with a lever 216 , and a movable gap is provided between the lever 216 and the inclined surface 2141 . All the levers 216 are fixedly mounted on the lever support plate 215 .

[0028] The measuring pipe 101 is installed in series in the pipe of the required flow measurement through two flanges 3. When fluid impacts the diverter cover 105 and the measuring cylinder 104, the measuring cylinder 104 will slide on the measuring cylinder sliding frame 103. The movement of the measuring cylinder 104 will drive the piston rod 112 to move. The movement of the piston rod 112 will slide in the piston rod sleeve 115, thereby squeezing the internal space of the piston rod sleeve 115, which causes the internal pressure of the piston rod sleeve 115 to increase. The piston rod sleeve 115 is connected to the inside of the detection piston cylinder 116, so the internal pressure of the detection piston cylinder 116 increases. At this time, the detection piston 117 will move upward on the inner wall of the detection piston cylinder 116, and then drive the guide rod 118 to move upward. The guide rod 118 will pull the detection rack 202 in the detection rack bracket through the moving connecting rod 203. 201, and stretch the tension spring 208 (the tension spring 208 is used to pull the detection rack 202 back to the initial position, and is also used to pull the measuring cylinder 104 and the diverter cover 105 back to the initial position). The movement of the detection rack 202 will produce a relative displacement with the sliding brush 206, thereby changing the position of the sliding brush 206 on the detection rack 202 to set the resistance bar. By measuring the series resistance on the sliding brush 206 and the resistance bar, the displacement size of the detection rack 202, that is, the deformation of the tension spring 208, can be obtained, so as to detect the pressure of the auxiliary gear 204 on the fluid. The faster the flow rate of the fluid, the greater the pressure on the auxiliary gear 204. Then, by measuring the resistance value, the flow rate of the fluid can be obtained, thereby obtaining the flow rate. Similarly, through the Hall sensor 102 set externally, the Hall sensor 102 can directly detect the displacement size of the measuring cylinder 104 (because the measuring cylinder 104 is provided with a magnetic element inside, when the measuring cylinder 104 moves, the magnetic field will also move accordingly).

[0029] By controlling the rotation of the output shaft of the regulating motor 110, the output shaft of the regulating motor 110 will drive the regulating driving gear 109 to rotate, the regulating driving gear 109 will drive the nut gear 108 to rotate, the nut gear 108 will drive the screw rod 107 to move axially, thereby driving the shunt cover 105 to move axially, the shunt cover 105 is retracted into the measuring cylinder 104 or completely extended from the measuring cylinder 104, the obstruction of the measuring cylinder 104 to the fluid can be changed, when the flow rate of the fluid is low, the shunt cover 105 can be retracted into the measuring cylinder 104 to obtain a greater obstruction to the fluid, thereby improving the measurement accuracy. On the contrary, when the flow rate of the fluid is very fast, the shunt cover 105 is extended from the measuring cylinder 104, at this time, the obstruction of the measuring cylinder 104 to the fluid can be reduced, thereby reducing the pressure drop of the fluid when measuring the flow rate.

[0030] Under normal conditions, the magnetic flux can fully pass through the tension spring 208, so that the inductance value reaches the maximum; when the tension spring 208 is stretched, the tightness of the tension spring 208 will change, which will diffuse the magnetic flux between the wires (the spiral body of the tension spring 208 can be regarded as a conductor), resulting in a waste of magnetic flux and a decrease in the inductance value. Therefore, the flow rate of the fluid can also be calculated by measuring the inductance of the tension spring 208.

[0031] When the flow rate of the fluid is very fast, the piston rod 112 will move to the maximum displacement, and detection will no longer be possible because the maximum value has been reached. At this time, the auxiliary motor 212 is energized. After the auxiliary motor 212 is energized, the output shaft will drive the auxiliary friction sleeve 213 to rotate. The rotation of the auxiliary friction sleeve 213 drives the tension spring connecting frame 207 to move through the friction force. Since there are two tension spring connecting frames 207 and they are symmetrically arranged, one of the tension spring connecting frames 207 will move in the direction away from the support surface 2142. At this time, the inclined surface 2141 and the auxiliary friction sleeve 213 will further squeeze the auxiliary friction column 217, so that the friction force between the auxiliary friction sleeve 213 and the inclined surface 2141 is further increased, which makes the auxiliary friction column 217 stuck between the inclined surface 2141 and the auxiliary friction sleeve 213. Then the stuck auxiliary friction column 217 will drive the lever 216 to rotate. The lever 216 rotates through the auxiliary rotating block 214 to drive the auxiliary gear 204, and the auxiliary gear 204 drives the detection rack 202 to move (the description at this time represents the transmission path of the force. In fact, due to the resistance of the fluid, The detection rack 202 is not moving, but is subjected to a force from the output shaft of the auxiliary motor 212, which is equivalent to the tension of the tension spring 208. The force applied to the detection rack 202 can be adaptively adjusted by the magnitude of the current passed through the auxiliary motor 212, thereby adapting to fluids with various flow rates). When the auxiliary motor 212 is not started, that is, in a normal state, the rotation of the auxiliary gear 204 will not be transmitted to the output shaft of the auxiliary motor 212, thereby reducing the resistance of the detection rack 202 when moving. This is because when the lever 216 rotates, one of the auxiliary friction columns 217 will be moved toward the direction close to the support surface 2142, which causes the auxiliary friction sleeve 213 and the inclined surface 2141 to no longer squeeze the auxiliary friction column 217. At this time, the lever 216 will drive the auxiliary rotating block 214 to rotate in the auxiliary friction sleeve 213 through the auxiliary friction column 217, but cannot drive the auxiliary friction sleeve 213 to rotate.

Claims

1. A multifunctional piston flowmeter, comprising a measuring pipe (101), with flanges (3) fixedly mounted at both ends of the measuring pipe (101), characterized in that: The inner wall of the measuring pipe (101) is slidably mounted with a measuring cylinder (104) via a measuring cylinder sliding frame (103); a sealing side plate (111) is fixedly mounted on one end of the measuring cylinder (104); a piston rod (112) is fixedly mounted on the sealing side plate (111); a detection piston cylinder (116) is also fixedly mounted on the inner wall of the measuring pipe (101) via a detection piston cylinder bracket (119); a piston rod sleeve (115) is fixedly mounted on the bottom end of the detection piston cylinder (116); the inner wall of the piston rod sleeve (115) is slidably matched with the piston of the piston rod (112); a detection piston (117) is slidably mounted on the inner wall of the detection piston cylinder (116); a guide rod (118) is fixedly mounted on the detection piston (117); and a Hall sensor (102) and a monitoring unit for monitoring the displacement size of the measuring cylinder (104) are also fixedly mounted on the outer surface of the measuring pipe (101); The monitoring unit comprises a detection rack bracket (201) and an auxiliary gear bracket (205) fixed to the measuring pipe (101); a detection rack (202) is slidably mounted on the detection rack bracket (201); a resistance bar is arranged on the surface of the detection rack (202); a sliding brush (206) slidably matched with the resistance bar is fixedly arranged on the auxiliary gear bracket (205); one end of the detection rack (202) is movably connected to the top end of the guide rod (118) via a movable connecting rod (203); the other end of the detection rack (202) is movably connected to a tension spring connecting frame (207); a helical tension spring (208) is fixedly mounted on the tension spring connecting frame (207); and one end of the tension spring (208) away from the tension spring connecting frame (207) is fixed to the measuring pipe (101) via a tension spring supporting block (209).

2. A multifunctional piston flowmeter according to claim 1, characterized in that: A partition plate (1041) is provided on the inner wall of the measuring cylinder (104) for dividing the interior of the measuring cylinder (104) into two chambers, and a through hole is provided on the partition plate (1041). A screw rod (107) is slidably mounted at the axial center of the partition plate (1041), and a flow divider (105) is fixedly mounted on one end of the screw rod (107). The flow divider (105) is slidably matched with the inner wall of the measuring cylinder (104).

3. A multifunctional piston flowmeter according to claim 2, characterized in that: The flow divider (105) is also fixedly mounted with two sliding support rods (106) arranged parallel to the screw rod (107). The sliding support rods (106) are slidably matched with the partition plate (1041). A nut gear (108) is rotatably mounted on a side of the partition plate (1041) away from the flow divider (105). The nut gear (108) is threadedly matched with the screw rod (107). An adjusting motor (110) is also fixedly mounted on the inner wall of the measuring cylinder (104). An adjusting driving gear (109) meshing with the nut gear (108) is fixedly mounted on the output shaft of the adjusting motor (110).

4. A multifunctional piston flowmeter according to claim 3, characterized in that: The piston rod (112) is provided with a pressure relief port (1121); a limiting slide rod support ring (114) is fixedly mounted on one end of the piston rod sleeve (115) close to the sealing side plate (111); a limiting slide rod (113) is slidably mounted on the limiting slide rod support ring (114); one end of the limiting slide rod (113) is fixedly mounted on the sealing side plate (111); and a limiting baffle is provided on the other end of the limiting slide rod (113) for preventing the piston rod (112) from being withdrawn from the piston rod sleeve (115).

5. A multifunctional piston flowmeter according to claim 4, characterized in that: The guide rod (118) is also slidably mounted on a guide rod reinforcement sliding frame (120), and the guide rod reinforcement sliding frame (120) is fixedly mounted on the measuring pipe (101). A shielding cover (210) fixedly matched with the measuring pipe (101) is also provided on the outer side of the detection rack (202).

6. A multifunctional piston flowmeter according to claim 5, characterized in that: An auxiliary gear (204) meshing with the detection rack (202) is rotatably mounted on the auxiliary gear bracket (205); a cartridge frame (211) is fixedly mounted on the side of the auxiliary gear bracket (205); an auxiliary motor (212) is fixedly mounted on the cartridge frame (211); an auxiliary friction sleeve (213) is rotatably mounted on the inner wall of the cartridge frame (211); and the auxiliary friction sleeve (213) is fixedly mounted on the output shaft of the auxiliary motor (212).

7. A multifunctional piston flowmeter according to claim 6, characterized in that: A lever support plate (215) is rotatably mounted on the auxiliary gear bracket (205). The lever support plate (215) and the auxiliary gear (204) are fixed as a whole via a rotating shaft. An auxiliary rotating block (214) is rotatably mounted in the auxiliary friction sleeve (213). The auxiliary rotating block (214) is provided with two symmetrically arranged inclined surfaces (2141). An auxiliary friction column (217) is overlapped on each inclined surface (2141). The auxiliary rotating block (214) is also provided with two symmetrically arranged supporting surfaces (2142). An arc leaf spring (218) is provided between the supporting surfaces (2142) and the auxiliary friction column (217).

8. A multifunctional piston flowmeter according to claim 7, characterized in that: The surface of each auxiliary friction column (217) is in contact with a lever (216), a movable gap is provided between the lever (216) and the inclined surface (2141), and all the levers (216) are fixedly mounted on the lever support plate (215).

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