A high pressure closed system continuous mass metering device

Abstract

A high-pressure sealed system continuous mass metering device, relating to the field of physical measurement technology, utilizes an embedded dual water tank and a magnetically controlled buoy-linked sealing mechanism to directly obtain continuous mass information of the test liquid using a weighing sensor and to automatically discharge the test liquid. The device includes an embedded dual water tank and a magnetically controlled buoy-linked sealing mechanism. The embedded dual water tank comprises an outer water tank and an inner water tank. The outer water tank provides a high-pressure sealed space, through which the test liquid overflows from the outer water tank into the top opening of the inner water tank. A weighing mechanism is provided between the outer and inner water tanks, and a drain outlet is provided at the bottom of the inner water tank. The magnetically controlled buoy-linked sealing mechanism includes a sealing pad for sealing and opening the drain outlet. A traction rope is provided on the sealing pad, with the other end of the traction rope connected to a buoy. An electromagnetic attraction component is provided on the lower surface of the top plate of the outer water tank. When the buoy tauts the traction rope, it is attracted and pulls the sealing pad.

Description

Technical Field

[0001] This utility model relates to the field of physical measurement technology, specifically to a continuous mass metering device for a high-pressure sealed system. Background Technology

[0002] In the measurement of liquid mass in high-pressure closed systems (such as petrochemical pipelines and energy storage tanks), traditional methods are mainly divided into two categories: indirect measurement and direct measurement. Indirect measurement usually uses Coriolis mass flow meters, which can provide continuous monitoring and have high accuracy in single-phase flow. However, their measurement accuracy is easily affected by installation stress, pressure fluctuations, and changes in fluid density, and they require complex pressure compensation mechanisms in high-pressure environments.

[0003] Direct measurement methods often employ load cells, which, while relatively simple in structure, still face challenges in high-pressure, closed environments, including interference from pipe connection stress, difficulty in achieving automatic drainage, and insufficient reliability in sealing. Especially in two-phase flow measurement scenarios, existing technologies often cannot simultaneously meet the requirements of high-pressure sealing, measurement accuracy, and automated operation.

[0004] Currently available high-pressure weighing devices mostly rely on external pressure stabilizing equipment or mechanical valve control, which has drawbacks such as system complexity, slow response, and high maintenance costs. For example, some solutions using external circulation pumps and accumulators can maintain pressure stability to a certain extent, but they cannot achieve automatic drainage after weighing, and it is difficult to eliminate the impact of pipeline stress on weighing accuracy. In addition, traditional mechanical valves are prone to leakage due to sealing failure under high-pressure environments, while direct control with solenoid valves suffers from large opening and closing impacts and short lifespans.

[0005] Therefore, there is an urgent need for a new type of weighing device that can adapt to high-pressure sealed environments, eliminate stress interference, and realize automatic weighing and liquid discharge integrated operation to meet the needs of modern industry for high-precision, high-efficiency, and high-reliability fluid measurement. Utility Model Content

[0006] I. Technical problems to be solved

[0007] This invention addresses the shortcomings of existing technologies by proposing a high-pressure sealed system continuous mass metering device. Through the cooperation of an embedded double water tank and a magnetically controlled buoyancy linkage sealing mechanism, it can directly obtain continuous mass information of the test liquid using a weighing sensor and can automatically remove the test liquid.

[0008] II. Specific Technical Solutions

[0009] A high-pressure closed-system continuous mass metering device includes an outer water tank and an inner water tank. The inner water tank has an inlet at its top, through which the test liquid from the outer water tank overflows into the inner water tank. A weighing mechanism is located below the inner water tank and connected to the outer water tank via the weighing mechanism. A drain outlet is located at the bottom of the inner water tank, and a sealing plate is installed on the drain outlet. A traction rope is installed on one side of the upper surface of the sealing plate, and the other end of the traction rope is connected to a floating part. The outer water tank is a closed enclosure, and an electromagnetic attraction component is installed on the lower surface of its top. When the floating part floats and straightens the traction rope, it causes the sealing plate to open and be attracted by the electromagnetic attraction component. The electromagnetic attraction component disengages from the floating part after power is cut off. The electromagnetic attraction component is electrically connected to the weighing mechanism.

[0010] Implementation principle and working principle:

[0011] This solution employs a pressure isolation principle, where the outer water tank bears high pressure, while the inner water tank is in a stable weighing environment, completely eliminating pipeline stress. When the test liquid enters the inner water tank, an overflow principle is used, meaning the test liquid overflows from the outer water tank to the inner water tank, ensuring that the inner water tank only bears the net weight of the liquid and avoiding the influence of buoyancy on the weighing in the outer water tank. The magnetic-buoyancy linkage control can trigger electromagnetic adsorption through changes in the buoyancy of the floating part, and mechanical linkage controls the opening and closing of the sealing plate. Through the above combination, the measurement accuracy is improved by 4-10 times compared to traditional methods, and a fully automatic weighing-draining cycle is achieved, greatly reducing manual intervention. Furthermore, since the sealing plate only needs to be opened slightly to open the drain outlet, resetting or reclosing the drain outlet can also be easily achieved.

[0012] Preferably, the lower surface of the other side of the sealing plate is rotatably connected to the bottom plate, and a sealing gasket that cooperates with the drain outlet is also provided on the lower surface of the sealing plate. The beneficial effect of this preferred embodiment is that the rotatable connection of the sealing plate causes the sealing plate to reset when the floating part drops with the liquid level, and the sealing gasket can further ensure the sealing effect of the drain outlet.

[0013] Preferably, the bottom plate of the inner water tank is provided with a drainage protrusion, the outer surface of which is conical, and the drain outlet is located on the drainage protrusion; the sealing plate has a recessed portion that mates with the drainage protrusion; the conical surface of the drainage protrusion mates with the recessed portion, which makes the sealing surface of the sealing plate and the drainage protrusion fit better. The compression ratio parameter setting provides the initial sealing force for the sealing ring and compensates for manufacturing errors. Under a pressure of 4MPa, the leakage is less than 0.1ml / min, the sealing life is greatly extended, and it can adapt to pressure changes without manual adjustment, which is simple and convenient.

[0014] Preferably, a support protrusion is also provided on the lower surface of the sealing plate. The bottom of the support protrusion is a spherical surface. The support protrusion is arranged around the recess and its height is 1 / 2 of the thickness of the sealing plate. The beneficial effect of this preferred embodiment is that by setting the support protrusion, the contact area between the sealing plate and the bottom plate can be reduced, the pressure between them can be reduced, and the sealing plate and the bottom plate can be in a state of pressure balance. This results in a lower force required to pull the sealing plate open. Precise height control can also prevent the sealing plate from being excessively deformed.

[0015] Preferably, a limiting cylinder is also provided on the lower surface of the top plate, and the electromagnetic attraction component is located at the top of the limiting cylinder; the floating part is a floating cylinder, which cooperates with the limiting cylinder; the beneficial effect of this preferred embodiment is that, by setting the limiting cylinder, it can be ensured that the floating part is not affected by liquid level fluctuations, and has good stability.

[0016] Preferably, the limiting cylinder is provided with a plurality of liquid inlet holes in its circumference; the liquid inlet holes are evenly distributed or spirally distributed along the axis; the beneficial effect of this preferred embodiment is that by setting the liquid inlet holes, it is convenient for the liquid to be tested to enter the limiting hole, and it can also reduce the disturbance and impact on the floating part.

[0017] Preferably, the bottom of the limiting cylinder is provided with several limiting plates, which are used for supporting and limiting the cylinder; the inner wall of the floating cylinder is provided with reinforcing ribs, and a pressure balance hole and a magnetic attraction part are provided on the upper surface of the floating cylinder; the beneficial effect of this preferred embodiment is that the limiting plates can support the floating cylinder, making it easier for the floating cylinder to float; the pressure balance hole ensures that the pressure inside and outside the floating cylinder is consistent; and with the cooperation of the reinforcing ribs, the pressure resistance is stronger; and the magnetic attraction part is located above the floating cylinder, making the force distribution more reasonable.

[0018] Preferably, the inlet of the outer water tank is equipped with a gate valve. This gate valve is shut off when the electromagnetic attraction component is adsorbed and connected to the floating part, preventing the test liquid from flowing into the inner water tank. When the attraction component is separated from the floating part, the test liquid is allowed to flow in. The beneficial effect of this preferred embodiment is that by controlling the gate valve and the adsorption state in a linked manner, it is possible to ensure that no new fluid flows in during the drainage stage when the water inlet is cut off, thereby further eliminating measurement errors during the drainage stage and improving measurement accuracy.

[0019] Preferably, the system also includes a controller, which is located outside the embedded dual water tank. The controller is electrically connected to the electromagnetic gate valve, the electromagnetic attraction component, and the weighing mechanism, respectively. It is used to control the gate valve and the electromagnetic attraction component based on the detection data of the weighing mechanism, and also to zero the weighing mechanism. The weighing mechanism, as the core sensor, monitors the changes in the liquid mass of the inner water tank in real time and transmits continuous analog or digital signals to the controller. The controller has a built-in control algorithm that processes the weighing data in real time and makes decisions based on preset logic to control the electromagnetic gate valve and the electromagnetic attraction component. By controlling the gate valve to precisely cut off the inflow before draining, the negative error problem caused by "draining while still receiving liquid" is completely solved, reducing human factors, reducing random errors, and improving reliability.

[0020] The beneficial effects of this utility model are as follows:

[0021] This solution enables direct, high-precision, automatic measurement of fluid quality in a high-pressure, closed environment. Through innovative internal and external water tank configurations, the external water tank in the pressurized environment is physically isolated from the internal water tank in the weighing unit, completely eliminating interference from pipeline connection stress on the weighing results. Combined with intelligent control logic that automatically cuts off the inlet before drainage, it fundamentally solves the problem of poor accuracy in traditional methods under high-pressure, closed conditions, significantly improving measurement accuracy and providing more precise data for fields such as high-pressure two-phase flow at low cost.

[0022] The system achieves fully automated, unattended operation of the entire process from calibration to liquid injection, weighing, draining, and resetting. Based on the weighing data, the system automatically triggers electromagnetic adsorption and valve action, which not only avoids human error but also shortens the single measurement cycle by several times, greatly improving the efficiency of experiments or online monitoring and ensuring high consistency and repeatability of the measurement process.

[0023] The technical challenges of high-pressure dynamic sealing and stable control have been overcome, ensuring the long-term durability and adaptability of the device. The dual sealing design of "conical surface + sealing ring" and the limiting cylinder structure with damping holes ensure the sealing reliability and smooth movement of the float under 4MPa high pressure. Key components such as the float and sealing gasket have been reinforced, enabling them to have a service life of tens of thousands of cycles. The device has a robust structure and can stably adapt to various fluids from low to high viscosity, providing a guarantee for long-term reliable operation in harsh industrial environments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a continuous mass metering device for a high-pressure sealed system according to an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram showing the cooperation between the limiting cylinder and the floating part in an embodiment of this utility model.

[0026] Figure 3 for Figure 1 A magnified view of a portion of the image.

[0027] Explanation of reference numerals in the attached figures:

[0028] Outer water tank 101, top plate 1011, liquid inlet 1012, gate valve 1013, inner water tank 102, water inlet 1020, drain outlet 1021, bottom plate 1022, drainage protrusion 1023, sealing pad 201, recess 2010, sealing ring 2011, support protrusion 2012, traction rope 202, floating part 203, reinforcing rib 2030, pressure balance hole 2031, magnetic suction part 2032, electromagnetic attraction assembly 204, limiting cylinder 205, liquid inlet 2050, limiting plate 2051, weighing mechanism 3, controller 4. Detailed Implementation

[0029] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings, so that the advantages and features of this utility model can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0030] like Figure 1-3 As shown:

[0031] This embodiment provides a continuous mass metering device for a high-pressure sealed system, such as... Figures 1-3 As shown, it mainly includes an outer water tank 10, an inner water tank 102, a weighing mechanism 3, and a controller 4; wherein, the outer water tank 101 is a cubic sealed container welded from 304 stainless steel plate with a thickness of 10mm, designed to withstand a pressure of 4MPa, and is provided with an inlet 1012 and a pressure relief valve at the top (the pressure relief valve is not shown in the figure), and an observation window is provided on its side.

[0032] The inner water tank 102 is a rectangular box without a top cover made of 316 stainless steel with a thickness of 5mm. It is fixed to the center position inside the outer water tank 101 by the weighing mechanism 3. The height of the inner water tank 102 is precisely calculated to ensure that when the liquid level in the outer water tank 101 reaches the working height, the excess liquid to be tested can smoothly overflow to the inlet 1020 of the inner water tank 102.

[0033] The embedded dual water tank 1 adopts the principle of pressure isolation. The outer water tank 101 bears high pressure, while the inner water tank 102 is in a stable weighing environment to completely eliminate pipeline stress. When the test liquid enters the inner water tank 102, the overflow principle is adopted, that is, the test liquid overflows from the outer water tank to the inner water tank, ensuring that the inner water tank 102 only bears the net weight of the liquid and avoids the influence of buoyancy on the weighing in the outer water tank.

[0034] A drainage protrusion 1023 is welded onto the bottom plate 1022 of the inner water tank 102. The outer surface of the protrusion is a 1:5 conical surface, and a drainage port 1021 with a diameter of 50mm is machined in the center. The weighing mechanism 3 is a set of high-precision cantilever beam load cells. The two ends of the load cells are connected to the bottom of the outer water tank 101 and the bottom of the inner water tank 102 respectively by high-strength bolts, and are used to measure the mass change of the inner water tank 102 and the liquid to be tested in real time.

[0035] In practical implementation, the electromagnetic attraction component 204 and the floating part 203 are the core components for achieving automatic drainage; it includes a sealing plate 201, a traction rope 202, a floating part 203, an electromagnetic attraction component 204, and a limiting cylinder 205; the sealing plate 201 has a recess 2010 on its lower surface that matches the taper of the drainage protrusion 1023, and a ring-shaped rubber sealing ring 2011 is embedded in the recess 2010, which has a thickness of 5mm in its natural state and a design compression rate of 18%. To ensure a reliable seal, the lower surface of the sealing plate 201 is also provided with four supporting protrusions 2012, the bottom of which is spherical and the height is half the thickness of the sealing plate 201. These are used to reduce friction and wear during the sealing process and to balance the pressure between the sealing plate 201 and the base plate, making it easier to pull the sealing plate 201 open. In specific implementation, the side of the sealing gasket 201 away from the traction rope is rotatably connected to the base plate 1022, which facilitates the reset of the sealing gasket 201 and the repeated sealing of the drain outlet 1021.

[0036] Specifically, the traction rope 202 is made of ultra-high molecular weight polyethylene fiber rope with a diameter of 2mm and a breaking strength greater than 300N. One end of the rope is fixed to the edge of the sealing plate 201, and the other end is connected to the floating part 203. The floating part 203 is a thin-walled stainless steel float with a diameter of 260mm, a height of 350mm, and a wall thickness of 1mm. It has radially arranged reinforcing ribs 2030 inside to enhance the structural strength. The top has a pressure balance hole 2031 with a diameter of 4mm, and a neodymium iron boron permanent magnet is embedded on the outer surface of the top as a magnetic attraction part 2032.

[0037] The limiting cylinder 205 is fixedly installed on the lower surface of the top plate 1011 of the outer water tank 101. Its sidewall has hundreds of liquid inlet holes 2050 with a diameter of 1.0 mm evenly distributed in a spiral manner. Three limiting plates 2051 are welded to the bottom for fixing and leveling. The electromagnetic attraction component 204 is installed at the top inside the limiting cylinder 205. It adopts a permanent magnet-electromagnetic hybrid design, with a rated voltage of DC24V. When energized, it generates an attraction force of more than 200N. When the power is off, it can ensure that the float ball can be reliably detached.

[0038] The inlet 1012 of the external water tank 101 is connected in series with a normally open two-position two-way solenoid gate valve 1013 via a pipeline. Its response time is less than 50ms, and its opening and closing are controlled by the controller 5. The controller 4 can be a PLC or an embedded control system and is installed outside the device. It is electrically connected to the weighing mechanism 3, the solenoid gate valve 1013 and the electromagnetic attraction component 204 via signal lines. The controller is pre-installed with a multi-segment PID control algorithm and a data acquisition program, which are used to receive weighing signals, process data and output control commands according to preset logic.

[0039] In this embodiment, the weighing mechanism 3 serves as the core sensor, monitoring the changes in liquid mass in the inner water tank 102 in real time and transmitting continuous analog or digital signals to the controller 4. The controller 4 specifically employs an embedded microcontroller with a built-in adaptive management algorithm to process sensor data and execute actions based on preset logic. The electromagnetic gate valve 1013 and the electromagnetic attraction component 204 receive electrical signals from the controller 4, such as on / off commands, and precisely execute actions to open / close the liquid inlet and adsorb / release the float. Specifically, the adaptive management algorithm is used to automatically fine-tune the critical mass value for triggering adsorption based on the comparison of historical and real-time data, or to adjust the delay between the gate valve closing and the electromagnet adsorption to adapt to different fluid viscosities or flow rates. It can also filter high-frequency noise in the weighing sensor signal, such as fluid sloshing and mechanical vibration, to ensure data stability.

[0040] The working process of this utility model device includes the following steps:

[0041] Initial calibration stage: Close the solenoid gate valve 1013 to ensure that the inner water tank 102 is empty; send a command through the human-machine interface of the controller 4 to control the weighing mechanism 3 to perform automatic zeroing calibration, and at the same time energize the electromagnetic attraction component 204; at this time, the float 203 is located at the bottom of the limit cylinder 205, and the sealing plate 201 seals the drain outlet 1021 under its own gravity.

[0042] Weighing and measurement stage: Controller 4 opens the solenoid gate valve 1013, and the liquid to be measured flows into the outer water tank 101 through the pipeline; the liquid level in the outer water tank 101 rises, and when its liquid level exceeds the height of the inlet 1020, the liquid to be measured overflows smoothly into the inner water tank 102; the weighing mechanism 3 continuously monitors and records the mass increase value of the inner water tank 102, and the controller 4 plots the time-mass curve in real time; as the liquid level in the inner water tank 102 rises, the buoyancy of the float 203 gradually increases; when the buoyancy is greater than the sum of its own weight and the tension of the traction rope 202, the float 203 floats smoothly in the limiting cylinder 205.

[0043] Drainage Triggering and Execution Phase: When the controller 4 determines that the reading of the weighing mechanism 3 has reached the preset target value or remains stable, it first issues a command to close the solenoid gate valve 1013, cutting off the liquid inflow. After a 100ms delay to ensure the flow path is cut off, the controller 4 keeps the electromagnetic attraction component 204 energized. At this time, the floating ball 203 is quickly attracted, the traction rope 202 is straightened, thereby pulling up the sealing plate 201, opening the drain outlet 1021, and the liquid in the inner water tank 102 begins to drain rapidly under the action of gravity; the weighing mechanism 3 records the final mass value at the start of drainage.

[0044] Automatic drainage and reset phase: During the drainage process, the liquid level in the inner water tank 102 drops, and the buoyancy of the float 203 decreases; when the controller 4 detects that the mass reading has dropped to near zero, it cuts off the power supply to the electromagnetic attraction component 204; after the electromagnetic force disappears, the float 203 detaches and falls under its own weight, and drives the sealing plate 201 to reset through the traction rope 202, resealing the drain outlet 1021.

[0045] Cycle preparation stage: Controller 4 controls the weighing mechanism 3 to perform zero calibration again to eliminate tare weight errors caused by possible residual droplets; after calibration, the system automatically enters the next weighing measurement cycle.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims.

Claims

1. A continuous mass metering device for a high-pressure closed system, characterized in that: The system includes an outer water tank (101) and an inner water tank (102). The inner water tank (102) has an inlet (1020) at its top, through which the test liquid in the outer water tank (101) overflows into the inner water tank (102). A weighing mechanism (3) is located below the inner water tank (102) and is connected to the outer water tank (101) via the weighing mechanism (3). A drain outlet (1021) is located at the bottom of the inner water tank (102), and a sealing plate (201) is installed on the drain outlet (1021). A sealing plate (201) is provided on one side of the upper surface of the sealing plate (201). The traction rope (202) is connected to a floating part (203) at the other end; the outer water tank (101) is a closed box, and an electromagnetic attraction component (204) is provided on the lower surface of the top plate (1011) of the outer water tank (101); when the floating part (203) floats and pulls the traction rope (202) straight, it drives the sealing plate (201) to open and is attracted by the electromagnetic attraction component (204). The electromagnetic attraction component (204) is disconnected from the floating part (203) after power is cut off; the electromagnetic attraction component (204) is electrically connected to the weighing mechanism (3).

2. The continuous mass metering device for a high-pressure sealed system according to claim 1, characterized in that: The inner water tank (102) includes a bottom plate (1022), and the lower surface of the other side of the sealing plate (201) is rotatably connected to the bottom plate (1022). A sealing gasket (2011) that cooperates with the drain outlet (1021) is also provided on the lower surface of the sealing plate (201).

3. The continuous mass metering device for a high-pressure sealed system according to claim 1, characterized in that: The bottom plate (1022) of the inner water tank (102) is provided with a drainage protrusion (1023), the outer surface of the drainage protrusion (1023) is conical, and the drain outlet (1021) is provided on the drainage protrusion (1023); the sealing plate (201) has a recess (2010) that cooperates with the drainage protrusion (1023).

4. The continuous mass metering device for a high-pressure sealed system according to claim 3, characterized in that: A support protrusion (2012) is also provided on the lower surface of the sealing plate (201). The bottom of the support protrusion (2012) is a spherical surface. The support protrusion (2012) is arranged around the recess (2010) and the height of the support protrusion (2012) is 1 / 2 of the thickness of the sealing plate (201).

5. The continuous mass metering device for a high-pressure sealed system according to claim 1, characterized in that: A limiting cylinder (205) is also provided on the lower surface of the top plate (1011), and the electromagnetic attraction component (204) is located on the top of the limiting cylinder (205); the floating part (203) is a floating cylinder, which cooperates with the limiting cylinder (205).

6. The continuous mass metering device for a high-pressure sealed system according to claim 5, characterized in that: The limiting cylinder (205) is provided with a plurality of liquid inlet holes (2050) in the circumferential direction; the liquid inlet holes (2050) are evenly distributed or spirally distributed along the axis.

7. The continuous mass metering device for a high-pressure sealed system according to claim 5, characterized in that: The bottom of the limiting cylinder (205) is provided with several limiting plates (2051), which are used to support and limit the limiting cylinder (205); the inner wall of the floating cylinder is provided with reinforcing ribs (2030), and pressure balance holes (2031) and magnetic suction parts (2032) are opened on the upper surface of the floating cylinder.

8. The continuous mass metering device for a high-pressure sealed system according to claim 1, characterized in that: The inlet (1012) of the outer water tank (101) is equipped with a gate valve (1013). The gate valve (1013) is closed when the electromagnetic attraction component (204) is adsorbed and connected with the floating part (203) to prevent the test liquid from flowing into the inner water tank (102). If the attraction component (204) is separated from the floating part (203), the test liquid is allowed to flow in.

9. The continuous mass metering device for a high-pressure sealed system according to claim 8, characterized in that: It also includes a controller (4), which is located outside the embedded double water tank (1). The controller (4) is electrically connected to the electromagnetic gate valve, the electromagnetic attraction component (204) and the weighing mechanism (3) respectively. It is used to control the gate valve (1013) and the electromagnetic attraction component (204) according to the detection data of the weighing mechanism (3), and is also used to zero the weighing mechanism (3).

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