Electric drive commutator of liquid flow standard device

Abstract

The invention belongs to the technical field of liquid flow standard devices, and particularly discloses a liquid flow standard device electric drive commutator which comprises a mounting table, the top of the mounting table is fixedly connected with a mounting frame, and the top of the mounting table is fixedly connected with two symmetrically-distributed mounting plates. A driving assembly is arranged on the surface of the mounting frame; the outlet flow velocity distribution of the Bezier line fishtail nozzle is better than that of a traditional linear nozzle and a traditional arc-shaped nozzle, when the flow velocity is low, the Bezier line enables liquid close to the outer wall of the fishtail nozzle to flow gently according to the viscous effect of fluid, and the state that the outlet of the nozzle is filled with the liquid is achieved; when the flow speed is large, the situation that liquid is blocked from being sprayed to the edge of the fishtail nozzle due to the fact that the curvature of the inward-converging section is too large is avoided, the fishtail nozzle meets the requirement for adapting to different flows through the shape line design, and other complex design with the leakage problem does not need to be conducted on the fishtail nozzle structure.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid flow standard devices, and particularly discloses an electrically driven commutator for a liquid flow standard device. Background Art

[0002] Liquid flow standard devices serve as the sole standard for the unification and transmission of unit values ​​in the field of liquid flow measurement, ensuring the transmission and traceability of liquid flow values, thereby ensuring the accuracy and reliability of liquid flow meters. The overall uncertainty of liquid flow standard devices is mainly composed of the uncertainties of the scale, commutator, and timer. Among them, the commutator is a very important component of the liquid flow standard device. The commutator system mainly includes: diverter (movable part of the rotating commutator), stepper motor drive system (including stepper motor, screw slider assembly, crankshaft connecting rod), fishtail nozzle, detection element (photoelectric switch and baffle), PLC and other components. However, the commutator in the current liquid flow standard device is mainly composed of straight line nozzles and arc line nozzles. This type of fishtail nozzle cannot meet the needs under different flow rates. Summary of the Invention

[0003] In view of this, the technical problem to be solved by the present invention is to propose an electrically driven commutator for a liquid flow standard device to solve the problem that the existing fishtail nozzle in the prior art cannot adapt to the requirements under different flow rates.

[0004] To achieve the above objectives, the present invention provides an electrically driven commutator for a liquid flow standard device, comprising a mounting platform, a mounting frame fixedly connected to the top of the mounting platform, two symmetrically distributed mounting plates fixedly connected to the top of the mounting platform, and a drive assembly provided on the surface of the mounting frame; In which, the driving assembly includes a stepper motor arranged on one side of the mounting frame, the output shaft of the stepper motor is fixedly connected to a screw rod, the surface of the screw rod is threadedly connected to a slider located inside the mounting frame, the top of the slider is fixedly connected to a driving rod, the other end of the driving rod is hinged to a crank connecting rod, the other end of the crank connecting rod is provided with a Bezier linear fishtail nozzle, the surface of the Bezier linear fishtail nozzle is provided with a connecting component, and the upper end of the Bezier linear fishtail nozzle is provided with a connecting structure.

[0005] In the above technical solution, preferably, the Bezier linear fishtail nozzle forms a liquid inlet section, a Bezier inward section, a Bezier outward section and a rectangular outlet section from top to bottom, wherein the rectangular outlet section passes through the mounting platform.

[0006] In the above technical solution, preferably, the connecting assembly includes two rotating shafts fixedly connected to the surface of the Bezier outward extension section, the other ends of the two rotating shafts pass through the adjacent mounting plates, and the surface of one of the rotating shafts is fixedly connected to one end of the crank connecting rod.

[0007] In the above technical solution, preferably, a connecting ring is fixedly connected to the surface of one of the mounting plates, the rotating shaft is slidably connected to the inner wall of the connecting ring, the inner wall of the connecting ring is provided with two symmetrically distributed limiting holes, an installation cavity is provided inside the rotating shaft, a slide is slidably connected to the inner wall of the installation cavity, one side of the slide is fixedly connected to a limiting rod, the other end of the limiting rod passes through the rotating shaft and extends to the interior of the adjacent limiting hole, and a first spring is fixedly connected between the other side of the slide and the inner wall of the installation cavity.

[0008] In the above technical solution, preferably, an electromagnet is fixedly connected to the side of the inner wall of the installation cavity away from the limiting rod, the slide is an iron metal material component, an infrared transmitter is embedded in the side of the limiting rod away from the slide, and an infrared receiver is embedded in the inner wall of the limiting hole.

[0009] In the above technical solution, preferably, the connection structure includes a connector connected to the upper end of the liquid inlet section, the surface of the connector is provided with an external thread, the surface of the connector is threadedly connected to a docking joint, the docking joint is used for connecting a water injection pipe, an air storage cavity is provided inside the connector, the inner wall of the air storage cavity is slidably connected to an extrusion ring, and the bottom of the extrusion ring and the interior of the air storage cavity are filled with inert gas.

[0010] In the above technical solution, preferably, a pressure plate is provided on the top of the connecting head, and a trigger rod distributed in a ring is fixedly connected to the top of the extrusion ring. The upper end of the trigger rod passes through the connecting head and is fixedly connected to the surface of the pressure plate. The surface of the trigger rod is sleeved with a second spring, the upper end of the second spring is fixedly connected to the inner wall of the air storage chamber, and the lower end of the second spring is fixedly connected to the surface of the extrusion ring.

[0011] In the above technical solution, preferably, a sealing bag is embedded in the top of the connector, a groove corresponding to the sealing bag is provided at the bottom of the docking head, a conduit is connected to the bottom of the sealing bag, and the other end of the conduit is connected to the air storage chamber.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The outlet flow velocity distribution of the Bezier line fishtail nozzle is better than that of the traditional straight line nozzle and arc line nozzle. When the flow rate is low, the Bezier line can make the liquid near the outer wall of the fishtail nozzle flow smoothly according to the viscosity of the fluid, so that the liquid fills the nozzle outlet; when the flow rate is high, the liquid will not be blocked from spraying toward the edge of the fishtail nozzle due to the excessive curvature of the inward section. Through this line design, the fishtail nozzle can adapt to the needs of different flow rates, and there is no need to make other complex designs of the fishtail nozzle structure that may have leakage problems.

[0013] The setting of the connection structure can reduce the leakage of the connection between the water injection pipe and the liquid inlet section, effectively improve the sealing strength, simplify the installation and disassembly method, avoid the leakage of the introduced water, and thus improve the use effect of the liquid flow standard device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic structural diagram of the drive assembly of the present invention; Figure 3 Schematic diagram of the separation of the butt joint and the Bezier line fishtail nozzle of the present invention; Figure 4 Schematic diagram of the distribution of the limiting holes and the rotating shaft of the present invention; Figure 5 for Figure 4 A magnified view of middle A; Figure 6 Schematic diagram of the connection structure of the present invention.

[0015] Figure: 1. Mounting table; 101. Mounting frame; 102. Mounting plate; 2. Drive assembly; 201. Stepper motor; 202. Slider; 203. Screw; 204. Drive rod; 205. Bezier fishtail nozzle; 2051. Liquid inlet section; 2052. Bezier inward section; 2053. Bezier outward section; 2054. Rectangular outlet section; 21. Connecting assembly; 2101. Electromagnet ; 2102, connecting ring; 2103, rotating shaft; 2104, first spring; 2105, infrared receiver; 2106, infrared transmitter; 2107, limiting rod; 2108, slide; 3, connecting structure; 301, connecting head; 302, docking head; 303, air storage chamber; 304, pressure plate; 305, catheter; 306, extrusion ring; 307, second spring; 308, trigger rod; 309, sealing bag. DETAILED DESCRIPTION

[0016] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] like Figures 1-6 The electrically driven commutator of a liquid flow standard device shown includes a mounting platform 1, a mounting frame 101 fixedly connected to the top of the mounting platform 1, two symmetrically distributed mounting plates 102 fixedly connected to the top of the mounting platform 1, and a drive assembly 2 provided on the surface of the mounting frame 101; Among them, the driving assembly 2 includes a stepper motor 201 arranged on one side of the mounting frame 101, the output shaft of the stepper motor 201 is fixedly connected to a screw rod 203, the surface of the screw rod 203 is threadedly connected to a slider 202 located inside the mounting frame 101, the top of the slider 202 is fixedly connected to a driving rod 204, the other end of the driving rod 204 is hinged to a crank connecting rod, the other end of the crank connecting rod is provided with a Bezier line fishtail nozzle 205, the surface of the Bezier line fishtail nozzle 205 is provided with a connecting component 21, and the upper end of the Bezier line fishtail nozzle 205 is provided with a connecting structure 3.

[0019] like Figures 1-6 As shown, the Bezier line fishtail nozzle 205 forms a liquid inlet section 2051, a Bezier inward section 2052, a Bezier outward section 2053 and a rectangular outlet section 2054 from top to bottom, wherein the rectangular outlet section 2054 passes through the mounting platform 1. Specifically, the Bezier line fishtail nozzle 205 is manufactured by 3D metal printing.

[0020] The connecting assembly 21 includes two rotating shafts 2103 fixedly connected to the surface of the Bezier extension section 2053. The other ends of the two rotating shafts 2103 pass through the adjacent mounting plates 102. The surface of one of the rotating shafts 2103 is fixedly connected to one end of the crank connecting rod.

[0021] A connecting ring 2102 is fixedly connected to the surface of one of the mounting plates 102, and the rotating shaft 2103 is slidably connected to the inner wall of the connecting ring 2102. The inner wall of the connecting ring 2102 is provided with two symmetrically distributed limiting holes, and an installation cavity is provided inside the rotating shaft 2103. A slide 2108 is slidably connected to the inner wall of the installation cavity. One side of the slide 2108 is fixedly connected to a limiting rod 2107, and the other end of the limiting rod 2107 passes through the rotating shaft 2103 and extends to the inside of the adjacent limiting hole. A first spring 2104 is fixedly connected between the other side of the slide 2108 and the inner wall of the installation cavity.

[0022] An electromagnet 2101 is fixedly connected to the inner wall of the installation cavity on the side away from the limiting rod 2107. The slide 2108 is made of iron metal. An infrared transmitter 2106 is embedded in the side of the limiting rod 2107 away from the slide 2108. An infrared receiver 2105 is embedded in the inner wall of the limiting hole. The stepping motor 201 drives the screw rod 203 to rotate forward and reversely to adjust the position of the slider 202, so that the crank connecting rod is driven to move through the driving rod 204. In this process, since the other end of the crank connecting rod is connected to the rotating shaft 2103 and is restricted by the position of the mounting plate 102, the Bezier line fishtail nozzle 205 can be driven to rotate and deflect around the rotating shaft 2103 to achieve the purpose of reversing the Bezier line fishtail nozzle 205. Specifically, the surface of the mounting frame 101 is provided with a photoelectric switch for controlling the stepping motor 201. At the same time, a PLC controller is provided for controlling the photoelectric switch, the stepping motor 201, the infrared receiver 2105, the infrared transmitter 2106 and the electromagnet 2101. Through the control analysis of stepper motors, a commutator stepper motor control model that can realize a linear flow characteristic curve was invented, and the mathematical expression of the model was given. Based on this drive model, a rotary commutator system based on PLC control was designed. .

[0023] Where: L- is the length of the Bezier line fishtail nozzle, The width of the B-Bezier line fishtail nozzle, R- is the rotation radius of the rotating commutator partition, Ωm- is the maximum angular velocity of the stepper motor, V- is the liquid flow rate, T- is time, β0- is the 1 / 2 angle of the rotating commutator partition passing through the nozzle, Q1,2(t)- is the flow rate switched in and out by the rotary commutator; The outlet flow velocity distribution of the Bezier line fishtail nozzle 201 is superior to that of traditional straight line nozzles and arc line nozzles. When the flow velocity is low, the Bezier line can make the liquid near the outer wall of the fishtail nozzle flow smoothly based on the viscosity of the fluid, so that the nozzle outlet is filled with liquid. When the flow velocity is high, the excessive curvature of the inward section will not prevent the liquid from being sprayed toward the edge of the fishtail nozzle. This line design allows the fishtail nozzle to adapt to the needs of different flow rates, without the need for other complex designs of the fishtail nozzle structure that may cause leakage problems. Under normal circumstances, the electromagnet 2101 is in a power-off state. At this time, the limit rod 2107 can be inserted into the inside of the limit hole under the action of the first spring 2104, thereby ensuring the stability of the position of the rotating shaft 2103 and avoiding the vibration caused by the contact with the inner wall of the Bezier line fishtail nozzle 205 during the flow of water, which leads to position deviation. When reversing is required, the electromagnet 2101 is energized to generate suction to move the adsorption slide 2108 toward the direction of the electromagnet 2101. In this process, the limit rod 2107 can be driven to retract into the inside of the installation cavity and separate from the limit hole, thereby releasing the limit on the position of the rotating shaft 2103. At this time, the rotating shaft 2103 can be adjusted by the stepper motor 201 until the limit rod 2107 is aligned with the other limit hole. At this time, the infrared receiver 2105 receives the infrared light emitted by the infrared transmitter 2106, thereby transmitting the signal to the PLC controller and shutting down the stepper motor 201 through the PLC controller to avoid excessive deviation of the rotating shaft 2103.

[0024] like Figures 1-6 As shown, the connection structure 3 includes a connector 301 connected to the upper end of the liquid inlet section 2051, the surface of the connector 301 is provided with an external thread, the surface of the connector 301 is threadedly connected to a docking joint 302, the docking joint 302 is used for connecting the water injection pipe, the interior of the connector 301 is provided with an air storage chamber 303, the inner wall of the air storage chamber 303 is slidably connected to an extrusion ring 306, and the bottom of the extrusion ring 306 and the interior of the air storage chamber 303 are filled with inert gas.

[0025] A pressure plate 304 is provided on the top of the connecting head 301, and a ring-distributed trigger rod 308 is fixedly connected to the top of the extrusion ring 306. The upper end of the trigger rod 308 passes through the connecting head 301 and is fixedly connected to the surface of the pressure plate 304. The surface of the trigger rod 308 is sleeved with a second spring 307. The upper end of the second spring 307 is fixedly connected to the inner wall of the air storage chamber 303, and the lower end of the second spring 307 is fixedly connected to the surface of the extrusion ring 306.

[0026] A sealing capsule 309 is embedded in the top of the connector 301 , and a groove corresponding to the sealing capsule 309 is provided at the bottom of the connector 302 . The bottom of the sealing capsule 309 is connected to a conduit 305 , and the other end of the conduit 305 is connected to the air storage chamber 303 .

[0027] The joint 302 is provided for the water injection pipe to cooperate with the connector 301 and communicate with the liquid inlet section 2051. During this process, the joint 302 and the connector 301 can be quickly installed by screwing. During the installation process, as the joint 302 is tightened, pressure can be applied to the pressure plate 304, causing it to drive the trigger rod 308 to insert into the interior of the gas storage chamber 303 and simultaneously drive the extrusion ring 306 to squeeze the inert gas inside the gas storage chamber 303 to apply pressure, so that the inert gas can be injected into the interior of the sealing bag 309 through the conduit 305 to achieve the effect of inflating the sealing bag 309 to fill the interior of the groove, as shown in FIG. Figure 6 The sealing bag 309 is shown in a bulging state, and the second spring 307 in the figure is in a stretched state. This method can effectively improve the connection sealing between the two, avoid leakage of the introduced water, and thus improve the use effect of the liquid flow standard device.

[0028] Working principle: Under normal circumstances, the electromagnet 2101 is in a power-off state. At this time, the limit rod 2107 can be inserted into the inside of the limit hole under the action of the first spring 2104, thereby ensuring the stability of the position of the rotating shaft 2103 and avoiding the vibration caused by the contact with the inner wall of the Bezier line fishtail nozzle 205 during the flow of water, which leads to position deviation. When reversing is required, the electromagnet 2101 is energized to generate suction to move the adsorption slide 2108 toward the direction of the electromagnet 2101. In this process, the limit rod 2107 can be driven to retract to the inside of the installation cavity and separate from the limit hole, thereby releasing the limit on the position of the rotating shaft 2103. At this time, the rotating shaft 2103 can be adjusted by the stepper motor 201 until the limit rod 2107 is aligned with the other limit hole. At this time, the infrared receiver 2105 receives the infrared light emitted by the infrared transmitter 2106, thereby transmitting the signal to the PLC controller and shutting down the stepper motor 201 through the PLC controller to avoid excessive deviation of the rotating shaft 2103.

[0029] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrically driven commutator for a liquid flow standard device, comprising a mounting platform (1), characterized in that: The top of the mounting platform (1) is fixedly connected to a mounting frame (101), the top of the mounting platform (1) is fixedly connected to two symmetrically distributed mounting plates (102), and the surface of the mounting frame (101) is provided with a drive assembly (2); The drive assembly (2) comprises a stepper motor (201) arranged on one side of the mounting frame (101), an output shaft of the stepper motor (201) is fixedly connected to a screw rod (203), a surface of the screw rod (203) is threadedly connected to a slider (202) located inside the mounting frame (101), a top of the slider (202) is fixedly connected to a drive rod (204), the other end of the drive rod (204) is hinged to a crank connecting rod, the other end of the crank connecting rod is provided with a Bezier line fishtail nozzle (205), a surface of the Bezier line fishtail nozzle (205) is provided with a connecting component (21), and the upper end of the Bezier line fishtail nozzle (205) is provided with a connecting structure (3).

2. The electrically driven commutator of a liquid flow standard device according to claim 1, characterized in that: The Bezier line fishtail nozzle (205) sequentially forms a liquid inlet section (2051), a Bezier inward section (2052), a Bezier outward section (2053), and a rectangular outlet section (2054) from top to bottom, wherein the rectangular outlet section (2054) passes through the mounting platform (1).

3. The electrically driven commutator of a liquid flow standard device according to claim 2, characterized in that: The connecting assembly (21) comprises two rotating shafts (2103) fixedly connected to the surface of the Bezier extension section (2053), the other ends of the two rotating shafts (2103) passing through the adjacent mounting plates (102), and the surface of one of the rotating shafts (2103) is fixedly connected to one end of the crank connecting rod.

4. The electrically driven commutator of a liquid flow standard device according to claim 3, characterized in that: A connecting ring (2102) is fixedly connected to the surface of one of the mounting plates (102), the rotating shaft (2103) is slidably connected to the inner wall of the connecting ring (2102), the inner wall of the connecting ring (2102) is provided with two symmetrically distributed limiting holes, the interior of the rotating shaft (2103) is provided with a mounting cavity, the inner wall of the mounting cavity is slidably connected to a slide plate (2108), one side of the slide plate (2108) is fixedly connected to a limiting rod (2107), the other end of the limiting rod (2107) passes through the rotating shaft (2103) and extends to the interior of the adjacent limiting hole, and a first spring (2104) is fixedly connected between the other side of the slide plate (2108) and the inner wall of the mounting cavity.

5. The electrically driven commutator of a liquid flow standard device according to claim 4, characterized in that: An electromagnet (2101) is fixedly connected to the inner wall of the installation cavity on a side away from the limiting rod (2107); the slide plate (2108) is a component made of iron metal material; an infrared transmitter (2106) is embedded and installed on the side of the limiting rod (2107) away from the slide plate (2108); and an infrared receiver (2105) is embedded and installed on the inner wall of the limiting hole.

6. The electrically driven commutator of a liquid flow standard device according to claim 2, characterized in that: The connection structure (3) comprises a connector (301) connected to the upper end of the liquid inlet section (2051), the surface of the connector (301) is provided with an external thread, the surface of the connector (301) is threadedly connected to a butt joint (302), the butt joint (302) is used for connecting a water injection pipe, an air storage cavity (303) is provided inside the connector (301), an extrusion ring (306) is slidably connected to the inner wall of the air storage cavity (303), and an inert gas is filled between the bottom of the extrusion ring (306) and the interior of the air storage cavity (303).

7. The electrically driven commutator of a liquid flow standard device according to claim 6, characterized in that: A pressure plate (304) is provided on the top of the connecting head (301), and a trigger rod (308) distributed in an annular manner is fixedly connected to the top of the extrusion ring (306). The upper end of the trigger rod (308) passes through the connecting head (301) and is fixedly connected to the surface of the pressure plate (304). A second spring (307) is sleeved on the surface of the trigger rod (308), and the upper end of the second spring (307) is fixedly connected to the inner wall of the air storage chamber (303). The lower end of the second spring (307) is fixedly connected to the surface of the extrusion ring (306).

8. The electrically driven commutator of a liquid flow standard device according to claim 7, characterized in that: A sealing capsule (309) is embedded in the top of the connector (301), a groove corresponding to the sealing capsule (309) is provided at the bottom of the docking joint (302), a conduit (305) is connected to the bottom of the sealing capsule (309), and the other end of the conduit (305) is connected to the air storage chamber (303).

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