A voltage stabilizing device and voltage stabilizing method for a flow standard device using metal liquid as medium

Abstract

The present invention relates to a flow standard device, and more particularly to a pressure stabilizing device and a pressure stabilizing method for a flow standard device with metal liquid as the medium. It comprises a pressure stabilizing tank C tube, wherein a B tube is nested in the pressure stabilizing tank C tube, and an A tube is nested in the B tube; and the three tubes of the pressure stabilizing tank C tube, B tube and A tube share a common bottom; and the tops of the B tube and the A tube are both open; and the height of the A tube is lower than that of the B tube, and the height of the B tube is lower than that of the pressure stabilizing tank C tube; a liquid inlet is provided at the corresponding bottom of the tube below the A tube, and a liquid outlet is provided on the wall of the B tube, and the liquid outlet extends out of the wall of the pressure stabilizing tank C tube. It solves the problem that the existing horizontal plate pressure stabilizing tank cannot stabilize the pressure when liquid lead-bismuth metal is used as the measuring medium, which ultimately causes the device to be unable to accurately calibrate the flow meter for the liquid lead-bismuth metal medium.

Description

Technical Field

[0001] The invention relates to a flow standard device, in particular to a voltage stabilizing device and a voltage stabilizing method for a flow standard device using metal liquid as a medium. Background Art

[0002] In the field of modern industrial measurement, liquid flow standard devices, as a key metering equipment, are used to provide accurate calibration benchmarks for various types of liquid flow meters to ensure that the flow measurement data in the industrial production process has a high degree of reliability and accuracy. The mainstream liquid flow standard devices on the market currently generally use water and oil as the measuring medium to calibrate liquid flow meters. At present, there are no reports on flow devices that use liquid lead-bismuth metal as the measuring medium. Due to the unique physical properties of liquid lead-bismuth metal (such as high density, low viscosity, etc.), conventional flow standard devices with water or oil as the medium cannot directly meet its calibration requirements. Therefore, the development and establishment of a liquid flow standard device specifically using liquid lead-bismuth metal as the measuring medium is of urgent practical significance to fill this technical gap, ensure that liquid lead-bismuth metal flow meters are accurately and effectively calibrated, and further improve the measurement technology level and process control capabilities in related industrial fields.

[0003] The expanded uncertainty and flow stability of liquid flow standard devices are the two most important technical indicators of flow standard devices. In order to obtain good flow stability indicators, water tower voltage stabilization and voltage regulator tube are mostly used to stabilize the liquid flow standard device. Due to the high cost of water tower voltage stabilization, horizontal plate type voltage regulator tank voltage stabilization is currently the most commonly used voltage stabilization method in flow standard devices.

[0004] The horizontal plate type pressure stabilizing tank has the function of absorbing high and low frequency pulsation of water flow and maintaining the stability of water flow. The pressure stabilizing tank is equipped with horizontal and vertical partitions, and the plates are densely covered with flow holes (also called energy dissipation plates). The lower side of the pressure stabilizing tank is water, and the upper side is closed compressed air, and a gas-liquid interface will be formed in the middle. When the water supply pump is turned on, the water level and flow field will change at different flow measurement points, and the gas-liquid interface will experience nonlinear sloshing, entrainment and mixing. The compressed air and partition on the upper side of the pressure stabilizing tank will average, buffer and absorb pulsation, so that the system flow state gradually tends to be stable.

[0005] Specifically, the liquid flow standard device usually uses a horizontal plate pressure stabilizing tank for pressure stabilization, and its upper and lower double chamber structure (such as Figure 1), the upper part is connected to compressed air to stabilize the pressure of conventional water or oil media. The middle energy dissipation plate effectively absorbs and consumes pressure fluctuations to ensure stable outlet pressure, which is suitable for flow meter detection and calibration of water and oil media. However, when facing high-temperature liquid lead-bismuth metal media, the existing structure has poor pressure stabilization effect and large outlet pressure fluctuations (over 8%), resulting in poor flow stability of the device and inability to accurately calibrate the flow meter for liquid lead-bismuth metal measurement. The characteristics of liquid lead-bismuth metal (such as high density and low viscosity) and its special interaction with container materials place higher requirements on the pressure stabilization system, which are difficult to meet with the existing structure. Therefore, it is urgent to develop a new pressure stabilization technology for high-temperature liquid lead-bismuth metal to adapt to its particularity and ensure accurate and stable flow calibration under high temperature conditions. Summary of the invention

[0006] The present invention aims at the defects of the prior art and provides a voltage stabilizing device and a voltage stabilizing method for a flow standard device using metal liquid as a medium.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme, including a pressure-stabilizing tank C tube, characterized in that a B tube is nested in the pressure-stabilizing tank C tube, and an A tube is nested in the B tube; and the pressure-stabilizing tank C tube, B tube, and A tube share a common bottom; and the tops of the B tube and the A tube are both open; and the height of the A tube is lower than that of the B tube, and the height of the B tube is lower than that of the pressure-stabilizing tank C tube; a liquid inlet is provided at the corresponding bottom of the tube below the A tube, and a liquid outlet is provided on the wall of the B tube, and the liquid outlet extends out of the wall of the pressure-stabilizing tank C tube.

[0008] Furthermore, the liquid inlet is arranged on a liquid inlet pipe, and the liquid inlet pipe is connected to the bottom of the cylinder.

[0009] Furthermore, the liquid outlet is arranged on the liquid outlet pipe, one end of the liquid outlet pipe is connected with the inner cavity of the B tube, and the other end of the liquid outlet pipe extends out of the wall of the pressure-stabilizing tank C tube; and the liquid outlet pipe is located at the lower part of the B tube.

[0010] Furthermore, an argon gas inlet pipe for introducing high-pressure argon gas is provided on the cover of the C cylinder of the pressure-stabilizing tank.

[0011] Furthermore, a safety valve is also provided on the cover of the pressure stabilizing tank C.

[0012] Furthermore, a temperature measuring port for installing a temperature sensor is provided on the cover of the C cylinder of the pressure-stabilizing tank.

[0013] Furthermore, a support is provided at the bottom of the C cylinder of the pressure stabilizing tank, and an energy dissipation plate is provided inside the A cylinder.

[0014] Furthermore, an overflow pipe is provided at the lower part of the cylinder body of the pressure stabilizing tank C, and a ring connection face welding flange DN50 is provided at the free end of the overflow pipe.

[0015] Furthermore, the space outside the A cylinder and inside the B cylinder is used as the B cavity, and the space outside the B cylinder and inside the C cylinder is used as the C cavity; the head of the C cylinder of the pressure-stabilizing tank is provided with a B cavity liquid level gauge interface, and the head area corresponding to the top of the B cylinder is removed from the head area corresponding to the top of the A cylinder, which serves as the B cavity liquid level gauge interface setting area; the B cavity liquid level gauge interface is located in this area; and a raised face flat welding flange DN50 is provided at the free end of the top of the B cavity liquid level gauge interface.

[0016] The sealing head of the C-tube of the pressure-stabilizing tank is provided with a C-cavity liquid level gauge interface. When in use, the liquid level gauge used to detect the liquid level of the C-cavity extends into the pressure-stabilizing tank through the interface; and a raised face flat welding flange DN50 is provided at the top free end of the C-cavity liquid level gauge interface.

[0017] A C cavity drain pipe is provided at the bottom of the C cavity, and a B cavity drain pipe is provided at the bottom of the B cavity; a pressure-taking pipe is provided on the B cavity drain pipe.

[0018] Furthermore, the voltage stabilization method of the voltage stabilization device of the flow standard device using metal liquid as the medium includes:

[0019] S1. Liquid lead-bismuth metal is introduced into cylinder A through the liquid inlet, so that the liquid level of the liquid lead-bismuth metal in cylinder A gradually rises.

[0020] S2. When the liquid level in cylinder A rises to a certain level, the liquid lead-bismuth metal begins to overflow into cylinder B, wherein most of the liquid lead-bismuth metal flows out through the liquid outlet of cylinder B. Through the overflow process of the liquid lead-bismuth metal from cylinder A to cylinder B, the pressure fluctuation of the liquid flow is reduced to achieve the stability of the liquid flow pressure at the liquid outlet.

[0021] S3. While the liquid lead-bismuth metal overflows into cylinder B, a small portion of the liquid lead-bismuth metal fluid overflows into cylinder C and flows back to the storage tank through the overflow pipe of cylinder C.

[0022] S4. Adjust the overflow flow of cylinder C in real time according to the pressure of cylinder B. That is, when the pressure of cylinder B is high, increase the overflow flow of cylinder C; when the pressure of cylinder B is low, reduce the overflow flow of cylinder C to help maintain the pressure of cylinder B stable.

[0023] S5. According to the monitoring results of the liquid level meter, adjust the top high-pressure argon pressure and control the overflow flow of the C cylinder to keep the liquid level of the C cylinder within the preset target liquid level range; by keeping the space in the C cylinder cavity constant and the internal pressure stable, indirectly ensure the pressure stability of the pressure regulating tank, thereby ensuring the pressure stability of the liquid flow at the outlet.

[0024] Compared with the prior art, the present invention has beneficial effects.

[0025] The present invention aims to solve the problem that the existing horizontal plate pressure-stabilizing tank is unable to stabilize the pressure when liquid lead-bismuth metal (lead-bismuth) is used as a measuring medium, which ultimately causes the device to be unable to accurately calibrate the flow meter of the liquid lead-bismuth metal medium.

[0026] Specifically, as an amorphous and flowable metal substance, liquid lead-bismuth metal fluid has excellent electrical and thermodynamic properties and is widely used. The flow rate of liquid lead-bismuth metal fluid is measured by a specially made electromagnetic flowmeter. The flow standard device using the lead-bismuth metal fluid as the medium of the technical solution of the present invention has a small pressure fluctuation at the outlet of the surge tank, which effectively solves the problem that the special electromagnetic flow measurement value cannot be accurately traced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. The protection scope of the present invention is not limited to the following description.

[0028] Figure 1 It is a structural schematic diagram of a pressure-stabilizing tank of a flow standard device for liquid media in the prior art.

[0029] Figure 2 The structure of the pressure stabilizing device of the flow standard device using metal liquid as the medium is shown in the specific embodiment. Figure 1 .

[0030] Figure 3 The structure of the pressure stabilizing device of the flow standard device using metal liquid as the medium is shown in the specific embodiment. Figure 2 .

[0031] In the figure, 1 is the liquid inlet; 2 is the liquid inlet pipe; 3 is the support (JB / T4712 support B2 3 S31608); 4 is the liquid outlet; 5 is the liquid outlet pipe DN100; 6 is the cylinder (DN1200×22); 7 is the cylinder of B cavity (1100×8); 8 is the cylinder of A cavity (610×8); 9 is the energy dissipation plate; 10 is the head (DN1200×22); 11 is the argon gas inlet pipe DN25; 12 is the safety valve; 13 is the temperature measuring port; 14 is the interface of the liquid level gauge of B cavity (DN50); 15 is the raised face flat welding flange DN50; 16 is the interface of the liquid level gauge of C cavity (DN50); 17 is the raised face flat welding flange DN50; 18 is the overflow pipe DN50; 19 is the ring connection face welding flange DN50; 20 is the pressure taking pipe; 21 is the liquid discharge pipe of B cavity (DN15); 22 is the liquid discharge pipe of C cavity (DN15). DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and beneficial effects of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0033] like Figure 1-3 As shown, the specific embodiment includes a C-tube of a pressure-stabilizing tank, a B-tube is nested inside the C-tube of the pressure-stabilizing tank, and an A-tube is nested inside the B-tube; and the C-tube, the B-tube, and the A-tube of the pressure-stabilizing tank share a common bottom; and the tops of the B-tube and the A-tube are both open; and the height of the A-tube is lower than that of the B-tube, and the height of the B-tube is lower than that of the C-tube of the pressure-stabilizing tank; a liquid inlet is provided at the bottom of the corresponding tube below the A-tube, and a liquid outlet is provided on the tube wall of the B-tube, and the liquid outlet extends out of the tube wall of the C-tube of the pressure-stabilizing tank. Among them, the C-tube, the B-tube, and the A-tube share a common bottom, that is, the bottoms of the A-tube and the B-tube are open, and share a tube bottom with the C-tube.

[0034] The voltage stabilizing device of the present invention can realize a flow range of 0.1m 3 / h~60m 3 / h, the measuring caliber is DN25 ~ DN100, and the flow stability is better than 0.3%. This index has reached the flow stability level of the flow standard device with ordinary water as the measuring medium.

[0035] Preferably, the liquid inlet is arranged on the liquid inlet pipe, which is connected to the bottom of the cylinder. The liquid outlet is arranged on the liquid outlet pipe, one end of which is connected to the inner cavity of cylinder B, and the other end of which extends out of the cylinder wall of cylinder C of the pressure-stabilizing tank; and the liquid outlet pipe is located at the lower part of cylinder B.

[0036] Preferably, a safety valve is also provided on the end cap of the C cylinder of the pressure-sustaining tank. The safety valve is used as a safety protection device when the internal pressure of the pressure-sustaining tank increases abnormally. When the pressure in the tank exceeds the preset safety value, the safety valve opens to release the excess pressure in the tank to prevent the tank body from rupturing due to excessive pressure. When the pressure drops to a safe range, the safety valve closes again and returns to a normal closed state.

[0037] Preferably, a temperature measuring port for installing a temperature sensor is provided on the cover of the C cylinder of the pressure-surge tank. An argon gas inlet pipe for introducing argon gas is provided on the cover of the C cylinder of the pressure-surge tank. A support is provided at the bottom of the C cylinder of the pressure-surge tank, and an energy dissipation plate is provided in the A cylinder. Among them, the top of the pressure-surge tank is connected to high-pressure argon gas through a flange. Argon gas, as an inert gas, can effectively avoid chemical reactions with liquid lead-bismuth metal fluids. The energy dissipation plate in the A cylinder is used for initial degassing and energy dissipation of the liquid flow, which can reduce the pressure fluctuations generated by the liquid flow when the pump is working, and can also eliminate bubbles generated by the liquid flow and the flow pulsation caused by radio waves.

[0038] An overflow pipe is provided at the bottom of the C cylinder of the pressure-surge tank, and a DN50 ring-connected face-welding flange is provided at the free end of the overflow pipe. The DN50 ring-connected face-welding flange is used as a pipeline connection element, and is connected to the corresponding flange on the external pipeline or equipment through fasteners such as bolts and nuts to form a reliable sealing connection, so that the liquid metal in the C cylinder can flow smoothly into or out of the designated storage tank through the overflow pipe, etc., realizing the directional transmission of liquid metal.

[0039] Preferably, the space outside cylinder A and inside cylinder B serves as cavity B, and the space outside cylinder B and inside cylinder C serves as cavity C; a cavity B liquid level gauge interface is provided on the head of cylinder C of the pressure-regulating tank, and the head area corresponding to the top of cylinder B is planed away from the head area corresponding to the top of cylinder A, as the cavity B liquid level gauge interface setting area; the cavity B liquid level gauge interface is located in this area; and a DN50 protruding flat welding flange is provided at the top free end of the cavity B liquid level gauge interface; a C cavity liquid level gauge interface is provided on the head of cylinder C of the pressure-regulating tank, and when in use, the level gauge used to detect the liquid level of cavity C extends into the pressure-regulating tank through the interface; and a DN50 protruding flat welding flange is provided at the top free end of the cavity C liquid level gauge interface; a C cavity drain pipe is provided at the bottom of cavity C, and a B cavity drain pipe is provided at the bottom of cavity B; a pressure taking pipe is provided on the cavity B drain pipe.

[0040] The use process of the present invention is described in combination with the accompanying drawings and technical solutions: The voltage stabilization method of the voltage stabilization device of the flow standard device with metal liquid as the medium includes:

[0041] S1. Liquid lead-bismuth metal is introduced into cylinder A through the liquid inlet, so that the liquid level of the liquid lead-bismuth metal in cylinder A gradually rises.

[0042] S2. When the liquid level in cylinder A rises to a certain level, the liquid lead-bismuth metal begins to overflow into cylinder B, wherein most of the liquid lead-bismuth metal flows out through the liquid outlet of cylinder B. Through the overflow process of the liquid lead-bismuth metal from cylinder A to cylinder B, the pressure fluctuation of the liquid flow is reduced to achieve the stability of the liquid flow pressure at the liquid outlet.

[0043] S3. While the liquid lead-bismuth metal overflows into cylinder B, a small portion of the liquid lead-bismuth metal fluid overflows into cylinder C and flows back to the storage tank through the overflow pipe of cylinder C.

[0044] S4. Adjust the overflow flow of cylinder C in real time according to the pressure of cylinder B. That is, when the pressure of cylinder B is high, increase the overflow flow of cylinder C; when the pressure of cylinder B is low, reduce the overflow flow of cylinder C to help maintain the pressure of cylinder B stable.

[0045] S5. According to the monitoring results of the liquid level meter, the overflow flow of cylinder C is controlled to keep the liquid level of cylinder C within the preset target liquid level range; by keeping the space in the cavity of cylinder C constant and the internal pressure stable, the pressure stability of the pressure regulating tank is indirectly guaranteed, thereby ensuring the pressure stability of the liquid flow at the outlet.

[0046] The core purpose of the present invention is to overcome the voltage stabilization problem encountered by current liquid flow standard devices when using liquid lead-bismuth metal (especially lead-bismuth alloy) as the measuring medium, so as to ensure the accurate calibration and verification of such special medium flow meters. The mainstream voltage stabilization equipment on the market, especially the traditional horizontal plate voltage stabilization tank, has significant functional limitations when facing the application scenarios of liquid lead-bismuth metal media, and cannot effectively provide the required voltage stabilization effect. This inadaptability directly hinders the normal operation of the liquid lead-bismuth metal flow measurement system, which in turn leads to the inability to accurately and reliably calibrate the flowmeter for liquid lead-bismuth metal media, which seriously affects the precision control and measurement compliance of related industrial processes.

[0047] Specifically, liquid lead-bismuth metal has unique physical and chemical properties, such as high melting point, high density, etc. These properties also bring specific challenges to its application in flow standard devices. Compared with common water, oil or other low-melting point liquid media, liquid lead-bismuth exhibits higher viscosity and stronger thermodynamic effects when flowing, and its sensitivity to pressure fluctuations is significantly enhanced. The existing horizontal plate pressure-stabilizing tank design is usually based on conventional fluid properties. Its pressure-stabilizing mechanism mainly relies on the balanced adjustment of the gas-liquid interface in the tank and the fluctuation of fluid energy absorbed and dissipated after the fluid flows through the multi-layer horizontal plate flow holes. However, when dealing with liquid lead-bismuth metal, due to the intensified gravity effect caused by its high density, the difference in flow state caused by the difference in medium, the difference in thermal expansion coefficient and the possible risk of phase change, the dynamic response capability of the traditional horizontal plate pressure-stabilizing tank is obviously insufficient, and it is difficult to maintain a constant and appropriate fluid pressure output, which in turn affects the measurement accuracy and stability of the flow meter used for liquid metal measurement by the flow device.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features therein may be replaced by equivalents. Therefore, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of the present invention.

Claims

1. A pressure stabilizing device for a flow standard device with metal liquid as the medium, comprising a pressure stabilizing tank C cylinder, characterized in that: The pressure stabilizing tank C is nested with the B cylinder, and the B cylinder is nested with the A cylinder; the pressure stabilizing tank C cylinder, B cylinder, and A cylinder share a common bottom; and the tops of the B cylinder and the A cylinder are both open; The height of the A cylinder is lower than that of the B cylinder, and the height of the B cylinder is lower than that of the C cylinder of the pressure-stabilizing tank; A liquid inlet is provided at the bottom of the corresponding cylinder below the A cylinder, and a liquid outlet is provided on the cylinder wall of the B cylinder, which extends out of the cylinder wall of the pressure-stabilizing tank C cylinder; The space outside the A cylinder and inside the B cylinder is used as the B cavity, and the space outside the B cylinder and inside the C cylinder is used as the C cavity; The head of the C cylinder of the pressure-stabilizing tank is provided with a B-cavity liquid level gauge interface. The head area corresponding to the top of the B cylinder is planed away from the head area corresponding to the top of the A cylinder, which is used as the B-cavity liquid level gauge interface setting area; the B-cavity liquid level gauge interface is located in this area; and a raised face flat welding flange DN50 is provided at the free end of the top of the B-cavity liquid level gauge interface; The sealing head of the C-tube of the pressure-sustaining tank is provided with a C-cavity liquid level gauge interface. When in use, the liquid level gauge for detecting the liquid level of the C-cavity extends into the pressure-sustaining tank through the interface; and a raised face flat welding flange DN50 is provided at the top free end of the C-cavity liquid level gauge interface; A C cavity drain pipe is provided at the bottom of the C cavity, and a B cavity drain pipe is provided at the bottom of the B cavity; a pressure-taking pipe is provided on the B cavity drain pipe; The liquid inlet is arranged on the liquid inlet pipe, and the liquid inlet pipe is connected with the bottom of the cylinder; The liquid outlet is arranged on the liquid outlet pipe, one end of the liquid outlet pipe is connected with the inner cavity of the B cylinder, and the other end of the liquid outlet pipe extends out of the cylinder wall of the pressure-stabilizing tank C cylinder; and the liquid outlet pipe is located at the lower part of the B cylinder; An argon gas inlet pipe for introducing high-pressure argon gas is provided on the cover of the C cylinder of the pressure stabilizing tank; A safety valve is also provided on the cover of the pressure stabilizing tank C; The sealing head of the C cylinder of the pressure stabilizing tank is provided with a temperature measuring port for installing a temperature sensor; A support is provided at the bottom of the C cylinder of the pressure stabilizing tank, and an energy dissipation plate is provided inside the A cylinder; An overflow pipe is provided at the lower part of the cylinder body of the pressure stabilizing tank C, and a ring connection face welding flange DN50 is provided at the free end of the overflow pipe; A voltage stabilization method for a flow standard device with metal liquid as the medium comprises: the voltage stabilization method is based on the voltage stabilization method of the voltage stabilization device, and specifically comprises the following steps: S1, injecting liquid lead-bismuth metal into cylinder A through the liquid inlet, so that the liquid level of the liquid lead-bismuth metal in cylinder A gradually rises; S2. When the liquid level in cylinder A rises to a certain level, the liquid lead-bismuth metal begins to overflow into cylinder B, wherein most of the liquid lead-bismuth metal flows out through the liquid outlet of cylinder B; through the overflow process of the liquid lead-bismuth metal from cylinder A to cylinder B, the pressure fluctuation of the liquid flow is reduced to achieve the stability of the liquid flow pressure at the liquid outlet; S3. While the liquid lead-bismuth metal overflows into the B cylinder, a small portion of the liquid lead-bismuth metal fluid overflows into the C cylinder and flows back to the storage tank through the overflow pipe of the C cylinder; S4, adjusting the overflow flow of cylinder C in real time according to the pressure of cylinder B, that is, when the pressure of cylinder B is high, increasing the overflow flow of cylinder C; when the pressure of cylinder B is low, reducing the overflow flow of cylinder C, so as to help maintain the pressure of cylinder B stable; S5. According to the monitoring results of the liquid level meter, adjust the top high-pressure argon pressure and control the overflow flow of the C cylinder to keep the liquid level of the C cylinder within the preset target liquid level range; by keeping the space in the C cylinder cavity constant and the internal pressure stable, indirectly ensure the pressure stability of the pressure regulating tank, thereby ensuring the pressure stability of the liquid flow at the outlet.

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