A gas-liquid ratio constant device

Abstract

A kind of gas-liquid ratio constant device, including first cavity for injecting liquid and second cavity for injecting gas, first waist wheel set is equipped in the first cavity, and first shaft body is drivenly connected with the first waist wheel set, second waist wheel set is equipped in the second cavity, and second shaft body is drivenly connected with the second waist wheel set, the first shaft body and second shaft body synchronous rotation, the waist wheel set of this application is set in two cavities respectively, two waist wheel sets synchronous rotation, each waist wheel set rotates a circle, respectively, the fixed volume of liquid and gas is discharged, to ensure that gas flow and liquid flow are locked according to certain proportion.

Description

Technical Field

[0001] This utility model relates to a device for maintaining a constant gas-liquid ratio. Background Technology

[0002] "Constant gas-liquid ratio" refers to the stable and unchanging ratio (converted when using mass flow rate or molar flow rate) of the gas phase volumetric flow rate to the liquid phase volumetric flow rate in a system or process involving the interaction of gas and liquid phases. A constant gas-liquid ratio is required in many scenarios, such as the precise mixing of gaseous and liquid feedstocks in the chemical industry. Furthermore, in the context of gas stations, the gas-liquid ratio is an important indicator for secondary oil and gas recovery and treatment. The mandatory standard of the "Emission Standard of Air Pollutants for Gas Stations" (GB20952-2020) requires that the gas-liquid ratio should be greater than or equal to 1.0 and less than or equal to 1.2. Gas-liquid ratio = Gas phase volumetric flow rate / Liquid phase volumetric flow rate.

[0003] For scenarios requiring precise gas-liquid ratio control, a relatively uncontrollable or difficult-to-control object in the gas or liquid phase (that is theoretically not allowed to be controlled or technically difficult to control) is typically used as a reference object, while a relatively controllable or easily controllable object (that is theoretically allowed to be controlled or technically easy to control) is used as the controlled object. A constant gas-liquid ratio is achieved by controlling the controlled object. In practice, closed-loop control is usually employed, detecting the volumetric flow rate of the reference object and controlling the flow rate of the controlled object through the closed loop to maintain a constant gas-liquid ratio.

[0004] For example, in a gas station's secondary vapor recovery system, the liquid phase flow rate (fuel) serves as the reference, while the gas phase flow rate (vapor) is the controlled object. The vapor-liquid ratio control principle of a gas station's secondary vapor recovery system includes open-loop control and closed-loop control. Open-loop control uses a fixed-frequency pump as a vacuum generator, adjusting the gas phase flow rate via a mechanical knob, achieving only a constant gas phase flow rate. When the liquid phase flow rate changes, the gas phase flow rate cannot change accordingly, resulting in significant fluctuations in the vapor-liquid ratio. Closed-loop control has two implementation methods: one uses a variable-frequency pump as a vacuum generator, detecting the liquid phase flow rate and indirectly controlling the gas phase flow rate by controlling the pump's speed to achieve a constant vapor-liquid ratio; the other uses a fixed-frequency pump as a vacuum generator, detecting the liquid phase flow rate, with a proportional valve connected in series in the gas path, controlling the gas phase flow rate by controlling the valve's opening. Open-loop control cannot achieve a precisely constant vapor-liquid ratio, and both closed-loop control methods require complex closed-loop control algorithms, flow detection devices, and closed-loop control mechanisms (variable-frequency pumps or proportional valves).

[0005] Open-loop control of the gas-liquid ratio is inaccurate; when the flow rate of the reference object fluctuates, the flow rate of the controlled object does not change accordingly. Closed-loop control equipment is complex, requiring monitoring of the flow rates of both the reference and controlled objects. It necessitates sophisticated closed-loop control algorithms, is generally more expensive, and suffers from adjustment lag. Utility Model Content

[0006] To solve the above problems, this technical solution provides a device for maintaining a constant gas-liquid ratio.

[0007] To achieve the above objectives, the technical solution is as follows:

[0008] A gas-liquid ratio constant device includes a first chamber for injecting liquid and a second chamber for injecting gas. The first chamber is provided with a first set of rotary wheels and a first shaft drivenly connected to the first set of rotary wheels. The second chamber is provided with a second set of rotary wheels and a second shaft drivenly connected to the second set of rotary wheels. The first shaft and the second shaft rotate synchronously.

[0009] In some embodiments, the first shaft and the second shaft are connected by a magnetic coupling.

[0010] In some embodiments, the first shaft and the second shaft are connected by a rigid shaft, and the rigid shaft is also connected to a rotary oil seal.

[0011] In some embodiments, the first cavity is provided with an inlet hole and an outlet hole located on both sides of the first waist wheel assembly, and a first rotating cavity and a second rotating cavity are provided between the inlet hole and the outlet hole.

[0012] In some embodiments, the first waist wheel assembly includes a first waist wheel that rotates in the first rotating cavity and a second waist wheel that rotates in the second rotating cavity. The first waist wheel and the second waist wheel rotate synchronously and cooperate with each other. Each rotation of the waist wheel assembly discharges a fixed volume of gas or liquid.

[0013] In some embodiments, the first lumbar wheel is driven by a first gear, and the second lumbar wheel is driven by a second gear, wherein the first gear meshes with the second gear.

[0014] The beneficial effects of this application are:

[0015] This application provides two lumbar wheel assemblies in each of the two cavities. The two lumbar wheel assemblies rotate synchronously. Each lumbar wheel assembly rotates once and discharges a fixed volume of liquid and gas respectively, thereby ensuring that the gas flow rate and liquid flow rate are locked in a certain ratio.

[0016] This application can be used for constant gas-liquid ratio, constant liquid-liquid flow ratio, and constant gas-gas flow ratio. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1This is a structural schematic diagram of an embodiment of the present utility model;

[0019] Figure 2 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0021] Figure 4 This is a cross-sectional schematic diagram of an embodiment of the present invention. Detailed Implementation

[0022] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] Please refer to Figure 1-4 As shown, a gas-liquid ratio constant device includes a first chamber 1 for injecting liquid and a second chamber 2 for injecting gas. The first chamber 1 is provided with a first spool 3 and a first shaft 4 drivenly connected to the first spool 3. The second chamber 2 is provided with a second spool (with the same structure as the first spool) and a second shaft 5 drivenly connected to the second spool. The first shaft 4 and the second shaft 5 rotate synchronously.

[0024] This application designs a mechanical device that can lock the flow rates of a reference object and a controlled object according to a certain ratio. Specifically (referencing the working principle of a Roots flow meter): a cavity is set in the flow channel of the reference object and the flow channel of the controlled object, and a pair of rotary wheels are installed therein. Each rotation of the rotary wheels discharges a fixed volume of gas (gas can be considered incompressible in subsonic conditions) or liquid. The rotary wheels and cavities are designed so that the ratio of the volume of gas or liquid discharged with each rotation of the rotary wheels of the reference object and the controlled object is equal to the required gas-liquid ratio. The two rotary wheels are connected by a rigid shaft or a coupling, so that the rotation speeds of the two rotary wheels are the same. Therefore, with each rotation of the rotary wheels of the reference object and the controlled object, the gas-liquid ratio is the required gas-liquid ratio, meaning that the flow rates of the reference object and the controlled object are locked at a fixed ratio by the consistent rotation speed of the rotary wheels.

[0025] In Example 1, reference Figure 2 The first shaft 4 and the second shaft 5 are connected by a magnetic coupling 6 to achieve synchronous rotation of the two shafts.

[0026] In Example 2, refer to Figure 3 The first shaft 4 and the second shaft 5 are connected by a rigid shaft 7, and the rigid shaft 7 is also connected to a rotary oil seal 8.

[0027] In the above embodiment, the first cavity 1 is provided with an inlet hole 9 and an outlet hole 10 located on both sides of the first waist wheel assembly 3, and a first rotating cavity 11 and a second rotating cavity 12 are provided between the inlet hole 9 and the outlet hole 10.

[0028] In the above embodiment, the first waist wheel assembly 3 includes a first waist wheel 31 that rotates in the first rotating cavity 11 and a second waist wheel 32 that rotates in the second rotating cavity 12. The first waist wheel 31 and the second waist wheel 32 rotate synchronously and cooperate with each other. Each rotation of the waist wheel assembly discharges a fixed volume of gas or liquid.

[0029] In the above embodiment, the first sprocket 31 is driven to be connected to the first gear 33, and the second sprocket 32 ​​is driven to be connected to the second gear 34, and the first gear 33 and the second gear 34 mesh.

[0030] Under normal conditions, the first and second waist wheels are in contact. When the drive device is activated, the waist wheels of the two chambers rotate simultaneously, which can discharge a fixed volume of liquid and gas. After one revolution, they return to the origin and discharge again in the next round, thus ensuring that the gas-liquid ratio is consistent and achieving a constant gas-liquid ratio.

[0031] The above description is only a preferred embodiment of this application and is not intended to limit the scope of implementation of this application. Any other embodiments whose principles and basic structures are the same as or similar to those of this application are within the protection scope of this application.

Claims

1. A device for maintaining a constant gas-liquid ratio, characterized in that, It includes a first cavity (1) for injecting liquid and a second cavity (2) for injecting gas. The first cavity (1) is provided with a first spool (3) and a first shaft (4) drivenly connected to the first spool (3). The second cavity (2) is provided with a second spool and a second shaft (5) drivenly connected to the second spool. The first shaft (4) and the second shaft (5) rotate synchronously.

2. The gas-liquid ratio constant device according to claim 1, characterized in that: The first shaft (4) and the second shaft (5) are connected by a magnetic coupling (6).

3. The gas-liquid ratio constant device according to claim 1, characterized in that: The first shaft (4) and the second shaft (5) are connected by a rigid shaft (7), and the rigid shaft (7) is also connected to a rotary oil seal (8).

4. The gas-liquid ratio constant device according to claim 1, characterized in that: The first cavity (1) is provided with an inlet hole (9) and an outlet hole (10) located on both sides of the first waist wheel assembly (3). A first rotating cavity (11) and a second rotating cavity (12) are provided between the inlet hole (9) and the outlet hole (10).

5. The gas-liquid ratio constant device according to claim 4, characterized in that: The first waist wheel assembly (3) includes a first waist wheel (31) rotating in the first rotating cavity (11) and a second waist wheel (32) rotating in the second rotating cavity (12). The first waist wheel (31) and the second waist wheel (32) rotate synchronously and cooperate with each other. Each rotation of the waist wheel assembly discharges a fixed volume of gas or liquid.

6. The gas-liquid ratio constant device according to claim 5, characterized in that: The first sprocket (31) is driven by a first gear (33), and the second sprocket (32) is driven by a second gear (34). The first gear (33) meshes with the second gear (34).

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