A micro-leakage correction method based on a gravity valve, a gravity valve, and a metering instrument

Abstract

The present invention discloses a micro-leakage correction method, a gravity valve and a metering instrument based on a gravity valve, relating to the technical field of metering instruments, and solving the technical problem that existing metering instruments cannot be corrected due to use conditions and environmental factors, resulting in inaccurate metering. The device includes a valve seat, a valve cover and a control motor; a joint is provided on the valve seat; the joint matches the valve cover; the control motor can control the movement of the valve cover to change the on-off state of the gravity valve; the control motor is fixedly connected to the valve seat. In the present invention, the joint on the valve cover matches the valve seat, and the control motor drives the valve cover to move to open or close the valve. After the valve is closed, the metering instrument identifies the movement state of the valve cover to judge whether the fluid passage leaks or seeps. When there is no leakage and the real-time flow rate is less than the set threshold, if the metering instrument shows a deviation, precise correction is performed on the metering instrument. The gravity valve can prevent reverse flow and avoid reverse flow.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid metering instruments, and in particular to a micro-leakage correction method based on a gravity valve, a gravity valve and a metering instrument. Background Art

[0002] Existing fluid metering instruments can be divided into two categories. One type is driven by the mechanical force of fluid flow, and the rotating components drive the counting mechanism to work to obtain the metering value. However, there are always small leakage gaps in mechanical components, and their operation is also affected by resistance such as friction. Only when the driving force of the fluid is greater than the resistance, it starts to operate for metering, and at this time, it is common that the metering value is on the small side. The other type is that electronic components convert the flow signal into measurable signals such as current, voltage or time. The electronic conversion components inevitably have parameter drift or parameter aging problems on a long time scale, resulting in the drift of the converted electronic signal and causing that zero flow cannot always correspond to a certain stable zero measurement signal. In addition, all fluid metering instruments have a limit value - the starting flow rate, which is listed as a basic parameter, and the flow rate below this parameter is not metered. Therefore, it is impossible to fundamentally avoid the metering loss of undercounting or overcounting of small flow rates, and only try to reduce this parameter to reduce the metering loss.

[0003] In the existing technology, there is a design of installing a check valve, but its installation purpose is to prevent fluid backflow and has no effect on metering performance. There is also a design of installing a manual valve, which can only play a role in suppressing undercounting, cannot estimate the leakage or seepage amount and is inconvenient to use. There is also a design of installing a certain automatic control solenoid valve to prevent running, dripping and leaking, but it also cannot estimate the leakage or seepage amount, and this kind of valve consumes a large amount of electricity and cannot meet the low-power usage occasions.

[0004] In the process of implementing the present invention, the inventor found that there are at least the following problems in the existing technology:

[0005] Due to the use conditions and environmental factors, the existing metering instruments have deviations that cannot be corrected and the metering is inaccurate. Summary of the Invention

[0006] The purpose of the present invention is to provide a micro-leakage correction method based on a gravity valve, a gravity valve and a metering instrument to solve the technical problem that in the existing technology, due to the use conditions and environmental factors, the existing metering instruments have deviations that cannot be corrected and the metering is inaccurate.

[0007] The many technical effects that can be produced by the preferred technical solutions provided by the present invention are described in detail below.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A micro-leakage correction method based on a gravity valve provided by the present invention corrects a metering instrument provided with the gravity valve. The correction method includes the following steps: S100. After the controller of the metering instrument receives the electrical signal from the sensor, it identifies the position of the valve cover of the gravity valve and determines whether the valve cover and the valve seat are in a completely closed state and remain stationary; if so, step S200 is executed; otherwise, step S400 is executed; S200. The controller determines whether the flow signal output by the metering instrument is a zero flow signal; if so, step S400 is executed; otherwise, step S300 is executed; S300. The controller automatically calculates a compensation amount according to the flow signal, and the compensation amount makes the metering instrument output a zero flow signal, and sends it to the cumulative calculation link of the flow of the metering instrument; S400. End the correction process.

[0010] Preferably, the metering instrument can also perform degradation analysis. The degradation analysis includes the following steps: S100'. The metering instrument obtains the absolute value of the initial flow rate without compensation; S200'. The storage module provided in the metering instrument stores the absolute value of the initial flow rate without compensation; S300'. The controller compares the historical absolute values of the initial flow rate without compensation stored in the storage module to determine whether the metering characteristics of the metering instrument have deteriorated; if so, step S400' is executed; otherwise, step S500' is executed; S400'. The controller sends a signal to the remote end to repair or replace the metering instrument; S500'. End the degradation analysis.

[0011] Preferably, before S100, it further includes: S10. The controller determines whether there is flow through the metering instrument; if so, step S20 is executed; otherwise, step S200 is executed; S20. The controller receives the real-time flow rate measured by the metering instrument and determines whether the real-time flow rate is always less than the set threshold within the set time period; if so, step S30 is executed; otherwise, step S400 is executed; S30. The controller controls the valve cover of the gravity valve to close the valve; the sensor provided on the gravity valve moves with the valve cover and generates an electrical signal and sends it to the controller.

[0012] Preferably, S100 includes the following steps: S110a. The valve cover and the valve seat are in a completely closed state, and the controller obtains a first detection result that the fluid channel does not leak or seep; S110b. The valve cover and the valve seat are not in a completely closed state, and the controller obtains a second detection result that the fluid channel leaks or seeps.

[0013] Preferably, after S110b, it includes the following steps: S120a. The controller calculates the leakage amount or seepage amount of the fluid in the fluid channel.

[0014] Preferably, after the step S110b, the following steps are further included: S120b. When the controller determines that the fluid passage has a leakage or seepage reaching the set warning time, the controller issues an alarm message.

[0015] A gravity valve, which is used in any one of the above-mentioned micro-leakage correction methods based on a gravity valve. The gravity valve includes a valve seat, a valve cover, and a control motor; a joint is provided on the valve seat; the joint is matched with the valve cover; the control motor is a micro-power switch valve motor, which can control the movement of the valve cover and change the on-off state of the gravity valve; the control motor is fixedly connected to the valve seat.

[0016] Preferably, the inside of the joint is trapezoidal; the interface surface of the valve cover is an inclined surface.

[0017] Preferably, the gravity valve further includes a support rod and a rotating shaft; the support rod connects the valve cover and the control motor; the support rod is movably connected to the control motor through the rotating shaft.

[0018] A measuring instrument, which includes the gravity valve described above, and the measuring instrument can measure the flow rate of the fluid in the fluid passage.

[0019] Implementing one of the above technical solutions of the present invention has the following advantages or beneficial effects:

[0020] In the present invention, the valve cover is matched with the joint on the valve seat, and the control motor drives the valve cover to move to open or close the valve. After the valve is closed, the measuring instrument identifies the movement state of the valve cover to judge whether the fluid passage leaks or seeps. When there is no leakage and the real-time flow rate is less than the set threshold, and there is a deviation in the measuring instrument, the measuring instrument is precisely corrected. The gravity valve can prevent reverse flow and avoid reverse flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings. In the drawings:

[0022] Figure 1 is a schematic diagram of the correction process of the embodiment of the micro-leakage correction method based on a gravity valve of the present invention;

[0023] Figure 2 is a schematic diagram of the deterioration analysis process of the embodiment of the micro-leakage correction method based on a gravity valve of the present invention;

[0024] Figure 3 This is the front view of an embodiment of the gravity valve of the present invention;

[0025] Figure 4 This is the cross-sectional view of an embodiment of the gravity valve of the present invention;

[0026] Figure 5 This is the perspective view of an embodiment of the gravity valve of the present invention.

[0027] In the figure: 1. valve seat; 11. joint; 2. valve cover; 21. interface surface; 3. control motor; 4. sensor; 5. support rod; 6. rotating shaft. Detailed implementation manners

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, various exemplary embodiments to be described below will refer to the corresponding drawings, which form a part of the exemplary embodiments and describe various exemplary embodiments that may be adopted to implement the present invention. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. It should be understood that they are only examples of processes, methods, devices, etc. consistent with some aspects of the present invention disclosed in detail in the appended claims. Other embodiments may also be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and essence of the present invention.

[0029] In the description of the present invention, it should be understood that the terms such as "center", "longitudinal", "lateral", etc. indicate the orientation or positional relationship based on the orientation or position shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the elements referred to must have a specific orientation, be constructed and operated in a specific orientation. The terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. The meaning of the term "plurality" is two or more. The terms "connected" and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more of the related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific circumstances.

[0030] In order to illustrate the technical solutions described in the present invention, the following will be described through specific embodiments, and only the parts related to the embodiments of the present invention are shown.

[0031] Embodiment 1:

[0032] As shown Figure 1 in the figure, the present invention provides a micro-leakage correction method based on a gravity valve. The correction method corrects a metering instrument provided with a gravity valve. The correction method includes the following steps: S100. After the controller of the metering instrument receives the electrical signal of the sensor 4, it identifies the position of the valve cover 2 of the gravity valve and determines whether the valve cover 2 and the valve seat 1 are in a completely closed state and remain stationary; if so, step S200 is executed; otherwise, step S400 is executed; S200. The controller determines whether the flow signal output by the metering instrument is a zero flow signal. If so, step S400 is executed; otherwise, step S300 is executed; S300. The controller automatically calculates a compensation amount according to the flow signal. The compensation amount makes the metering instrument output a zero flow signal and is sent to the cumulative calculation link of the metering instrument flow; S400. End the correction process. Specifically, when the metering instrument has a deviation during operation, precise correction is required to make the metering instrument measure the flow precisely and accurately, and to avoid inaccurate measurement of the metering instrument due to environmental temperature and usage conditions. When the valve cover 2 is in the closed position and remains stationary, and the output signal of the electronic measurement circuit of the metering instrument is not a zero flow signal, precise correction is required. At this time, the controller automatically calculates the compensation amount of the signal through the output signal of the electronic measurement circuit, so that the output signal of the electronic measurement circuit of the metering instrument is a zero flow signal, and the zero flow signal is sent to the flow cumulative calculation link for accurate flow accumulation and to ensure the accuracy of flow accumulation. The compensation amount is always memorized in the controller, which is convenient for the metering instrument to always use this compensation amount for correction when there is this deviation value. When the output signal is not a zero flow signal again next time, the deviation value of the metering instrument changes, and a new compensation amount is recalculated and used to correct the output signal; or when there is fluid flowing through the metering instrument again and correction is required, a new compensation amount is recalculated for correction. The compensation amount is calculated by existing calculation methods, and different non-zero flow signals are output, and the calculated compensation amounts are also different. The present invention corrects the flow signal output by the metering instrument to zero flow when the valve is closed and no fluid flows through the metering instrument. The controller in the metering instrument identifies the metering value of the metering instrument and judges whether the real-time flow rate is less than the set threshold when there is fluid flowing through the metering instrument for measurement. If it is less than the set threshold, the valve needs to be closed by the controller. The controller identifies the movement state of the valve cover 2 through the sensor 4 on the gravity valve, and then judges whether there is leakage or seepage in the fluid channel. If there is no leakage or seepage and the metering instrument has a deviation, the compensation amount is calculated through the flow signal output by the metering instrument to correct the metering instrument. After leakage or seepage occurs, the controller can calculate the leakage value, seepage value or alarm after a period of time.

[0033] As an optional implementation manner, as Figure 2As shown, the metering instrument can also perform degradation analysis, and the degradation analysis includes the following steps: S100': The metering instrument obtains the absolute value of the starting flow rate without compensation; S200': The storage module provided in the metering instrument stores the absolute value of the starting flow rate without compensation; S300': The controller compares the historical absolute value of the starting flow rate without compensation stored in the storage module to determine whether the metering characteristics of the metering instrument have deteriorated; if so, execute step S400'; otherwise, execute step S500'; S400': The controller sends a signal for repairing or replacing the metering instrument to the remote end; S500': End the degradation analysis. Specifically, the flow rate below the starting flow rate is too small to be measured, so there is a metering loss of under-measurement or over-measurement of small flow rates. Analyzing the degradation is to reduce the problem of under-measurement or over-measurement of small flow rates. When the metering characteristics of the metering instrument deteriorate, the starting flow rate will become larger, and more flow rates cannot be measured, or the starting flow rate becomes smaller and extra small flow rates are measured. The flow rate value measured by the metering instrument will be inaccurate. By analyzing the degradation, the accuracy of the measurement by the metering instrument is ensured in real time. By comparing the starting flow rate value obtained each time with all the previously stored starting flow rate values and analyzing the magnitude of the obtained starting flow rate value, it is determined whether the metering instrument has deteriorated. After degradation, remote alarm is given to remind the monitoring personnel to repair or replace the metering instrument, ensuring the metering characteristics of the metering instrument and obtaining accurate metering values.

[0034] As an optional implementation manner, as Figure 1 shown, before S100, it further includes: S10: The controller determines whether there is a flow rate passing through the metering instrument; if so, execute step S20; otherwise, execute step S200; S20: The controller receives the real-time flow rate measured by the metering instrument and determines whether the real-time flow rate has been less than the set threshold within the set time period; if so, execute step S30; otherwise, execute step S400;

[0035] S30. The controller controls the valve cover 2 of the gravity valve to close the valve; the sensor 4 provided on the gravity valve moves with the valve cover 2 and generates an electrical signal to be sent to the controller. Specifically, the set threshold is the normal real-time flow value detected by the metering instrument based on the error leakage value of the fluid passage (i.e., the inevitable leakage value during the installation of the fluid passage). The normal real-time flow value is the minimum value in the normal state when the fluid passes through the metering instrument. When the subsequent real-time flow of the fluid through the metering instrument is less than the normal real-time flow value, it indicates that the fluid passage may be damaged, and there is abnormal leakage or seepage of the fluid, or the metering instrument has a deviation due to the influence of environmental temperature and usage conditions. The normal real-time flow value is stored as the set threshold by the metering instrument so that the controller can compare the set threshold with the real-time flow in real time to determine whether the flow through the metering instrument is normal. The set duration is to ensure a certain stability in the abnormal flow of the fluid through the metering instrument and avoid the situation of detecting as soon as abnormal phenomena occur, which affects the work efficiency. The metering instrument stores the set threshold and the set duration to facilitate accurate judgment of the abnormal flow situation through the metering instrument, and the set duration can be set according to actual needs and real situations. When the controller determines that the real-time flow is always greater than or equal to the set threshold within the set duration and the flow value is unstable, the controller makes the control motor 3 open the valve, and the valve does not interfere with the measurement of the metering instrument. Before step S10, the functional relationship corresponding to the moving distance of the valve cover 2 from the valve seat 1 or the vibration frequency of the valve cover 2 and the leakage or seepage flow rate is measured in advance and stored in the storage module of the metering instrument, and the leakage or seepage flow rate of the fluid passage can be obtained by directly detecting the moving distance or vibration frequency of the valve cover 2 subsequently.

[0036] As an optional implementation manner, such as Figure 1As shown, S100 includes the following steps: S110a. The valve cover 2 and the valve seat 1 are in a fully closed state, and the controller obtains the first detection result, indicating that there is no leakage or seepage in the fluid passage; S110b. The valve cover 2 and the valve seat 1 are not in a fully closed state, and the controller obtains the second detection result, indicating that there is leakage or seepage in the fluid passage. Specifically, when there is no leakage or seepage in the fluid passage, the real-time flow rate measured by the metering instrument during operation is continuously less than the set threshold within the set time period, and the metering instrument has a deviation due to the influence of environmental temperature and usage conditions. When there is leakage or seepage in the fluid passage, a negative pressure is generated due to the minute leakage or seepage downstream of the metering device, resulting in a pressure difference on both sides of the gravity valve. When the pressure difference is too small, the generated negative pressure cannot resist the closing force of the gravity valve, and the valve cover 2 cannot be pushed by the negative pressure; when the pressure difference is too large, the generated negative pressure exceeds the closing force of the valve, and the valve cover 2 is pushed by the flowing force of the fluid, and the valve cover 2 will move to release the generated negative pressure until it converges with the supply-side pressure; when there is no leakage or seepage in the fluid passage, there is no pressure difference on both sides of the gravity valve, and the valve cover 2 will not open. When the valve cover 2 and the valve seat 1 are not in a fully closed state, the valve cover 2 is in a state of moving away from the valve seat 1 or vibrating back and forth.

[0037] As an optional implementation, as Figure 1 shown, after S110b, it includes the following steps: S120a. The controller calculates the leakage or seepage amount of the fluid in the fluid passage. Specifically, the controller can estimate through the real-time flow rate measured by the metering instrument before the fluid passage leaks or seeps and the flow rate measured by the metering instrument that is less than the set threshold, and obtain an approximate flow rate value of the leakage or seepage in the fluid passage. The leakage or seepage amount of the fluid in the fluid passage is the real-time flow rate measured by the metering instrument before the fluid passage leaks or seeps minus the flow rate measured by the metering instrument that is less than the set threshold.

[0038] As an optional implementation, as Figure 1 shown, after S110b, it further includes the following steps: S120b. When the controller determines that the leakage or seepage in the fluid passage reaches the set warning time, the controller issues an alarm message. Specifically, when the leakage or seepage in the fluid passage reaches the set warning time, it indicates that the leakage situation of the fluid passage is relatively serious and is in a continuous leakage state. By sending an alarm signal to the remote end, it reminds the monitoring personnel that the fluid passage is severely damaged and needs to be repaired or replaced.

[0039] Embodiment 2:

[0040] As Figures 3-5As shown in the figure, a gravity valve is used in a micro-leakage correction method based on a gravity valve in the first embodiment. The gravity valve includes a valve seat 1, a valve cover 2, and a control motor 3. A joint port 11 is provided on the valve seat 1. The joint port 11 matches the valve cover 2. The control motor 3 is a micro-power switch valve motor that can control the movement of the valve cover 2 to change the on-off state of the gravity valve. The control motor 3 and the valve seat 1 are fixedly connected. Specifically, the gravity valve is used to realize the on-off of the fluid passage and control the use of the fluid. The valve of the gravity valve has a check function to prevent the reverse flow of the fluid. The fluid in the fluid passage flows from the side of the gravity valve without the valve cover 2 to the side with the valve cover 2. The joint port 11 of the gravity valve is a through hole for fluid circulation, and the valve cover 2 is used to block the joint port 11 to close the valve. The joint port 11 and the valve cover 2 match each other to ensure that the valve cover 2 can completely block the joint port 11, achieving an interference fit to prevent leakage or seepage. At the same time, the situation where the valve cover 2 is larger than the joint port 11 and the contact between the valve cover 2 and the joint port 11 is not tight will not occur, nor will the situation where the valve cover 2 is smaller than the joint port 11 and the valve cover 2 cannot block the joint port 11. The size of the joint port 11 can be set according to actual needs, and the size of the valve cover 2 will also change accordingly. The larger the joint port 11, the greater the flow rate of the fluid. The gravity valve is lightweight. When the control motor 3 operates and rotates, only a force slightly greater than the gravitational torque of the valve cover 2 is required to drive the valve cover 2 to move, consuming less electricity to realize the action of closing or opening the valve, which is more convenient when using the gravity valve. The control motor 3 is preferably a micro-power switch valve motor, which can make the gravity valve consume less electricity and has the advantage of low power consumption, improving the service life of the control motor 3. The control motor 3 can also be composed of a simple electromagnet, and the valve cover 2 is pushed by the electromagnet to open and close. The fixed connection between the control motor 3 and the valve seat 1 ensures the structural stability and the use safety of the gravity valve. In the present invention, the valve cover 2 and the joint port 11 on the valve seat 1 match each other, and the control motor 3 drives the valve cover 2 to move to open or close the valve. After the valve is closed, the metering instrument identifies the movement state of the valve cover 2 to judge whether there is leakage or seepage in the fluid passage. When there is no leakage and the real-time flow rate is less than the set threshold, and there is a deviation in the metering instrument, the metering instrument is precisely corrected. The gravity valve can prevent reverse flow and avoid reverse flow.

[0041] As an optional implementation manner, as Figures 4-5As shown, the inside of the joint 11 is trapezoidal; the interface surface 21 of the valve cover 2 is beveled. Specifically, the inside of the joint 11 is trapezoidal, the interface surface 21 of the valve cover 2 is beveled, the trapezoid inside the joint 11 matches the interface surface 21 of the valve cover 2, and the joint gap gradually becomes smaller from large when closing, which can overcome the impact force of the fluid on the valve cover 2. At the same time, the contact surface between the valve cover 2 and the joint 11 of the valve seat 1 increases, which can improve the friction between the interface surface 21 of the valve cover 2 and the joint 11, and at the same time increase the elastic force between the interface surface 21 of the valve cover 2 and the joint 11. The joint 11 between the valve cover 2 and the valve seat 1 is squeezed together by the elastic force, so that the valve cover 2 and the valve seat 1 achieve interference fit, and there is no gap when the valve is closed. It can also produce a scraping and cleaning effect on the joint surface, which helps to maintain the closing tightness of the joint surface. The bevel angle or a certain specific curve radian of the interface surface 21 of the valve cover 2 is not limited and can be set according to actual needs. In addition, the valve cover 2 can also be set as a sphere, and under the action of gravity, a good closure is formed by the spherical surface and the valve seat 1. At the same time, the valve cover 2 can be weighted to strengthen the closing tightness of the joint surface between the valve cover 2 and the valve seat 1. The added weight should be less than the maximum torque of the control motor 3; the added weight should also be less than the moment of force for the fluid impact to automatically push open the valve cover 2.

[0042] As an optional implementation, such as Figures 3-5As shown, the gravity valve further includes a support rod 5 and a rotating shaft 6; the support rod 5 is connected to the valve cover 2 and the control motor 3; the support rod 5 is movably connected to the control motor 3 through the rotating shaft 6. Specifically, the support rod 5 is movably connected to the control motor 3 through the rotating shaft 6, so that when the control motor 3 rotates, it can drive the rotating shaft 6 to rotate, thereby driving the support rod 5 to swing. The valve cover 2 on the support rod 5 moves with the swing of the support rod 5, enabling the valve of the gravity valve to be opened or closed. The position where the support rod 5 is installed on the valve seat 1 is set at the position where the joint 11 between the valve cover 2 and the valve seat 1 can correspond when the support rod 5 drives the valve cover 2 to close, that is, the position where the support rod 5 is installed on the valve seat 1 changes with the length of the support rod 5, or the length of the support rod 5 can also be selected according to the installation position of the support rod 5. The valve of the gravity valve realizes the opening or closing operation of the valve cover 2 through the control motor 3. At the same time, if the flow rate in the fluid passage is large, the valve cover 2 can also be automatically pushed open under the action of the fluid impact force. Or, the valve of the gravity valve realizes the closing operation of the valve cover 2 through the control motor 3, and the valve cover 2 is opened by the fluid impact force. After the valve cover 2 is opened and remains stably docked, the opening degree of the valve cover 2 does not reduce the cross-sectional area of the fluid flow channel, which can ensure that the additional flow pressure loss increased by the valve of the present invention is very small. In addition, two sensors 4 respectively arranged on the valve seat 1 and the valve cover 2 of the gravity valve cooperate with each other to detect the docking position and movement state of the valve cover 2. The sensor 4 on the valve cover 2 can move with the movement of the valve cover 2. The two sensors 4 can be induced through the induction pieces on the sensors 4, thereby inducing the position of the valve cover 2. When the valve cover 2 and the valve seat 1 are completely closed, the two sensors 4 can cooperate with each other to emit an electrical signal; when the valve cover 2 and the valve seat 1 are not completely closed, the two sensors 4 cannot sense each other and cannot emit an electrical signal. The sensor 4 is preferably a displacement sensor, which can effectively detect the positional relationship between the valve cover 2 and the valve seat 1 and judge the displacement of the valve cover 2.

[0043] Embodiment 3:

[0044] The present invention also provides a measuring instrument, which includes the gravity valve in Embodiment 2, and the measuring instrument can measure the flow rate of the fluid in the fluid passage. Specifically, the measuring instrument can detect the real-time flow rate of the fluid passing through the measuring instrument after the fluid passage is opened and perform measurement. The measurement result is the usage flow rate of the used fluid, and the registration fee can be carried out by reading the value on the dial of the measuring instrument. The controller in the measuring instrument of the present invention is electrically connected to the gravity valve. The controller controls the movement of the valve cover 2, changes the parking position of the valve cover 2, and the controller identifies the measurement value of the measuring instrument and the movement state of the valve cover 2 to detect the leakage or seepage of the fluid passage, and then performs precise calibration on the measuring instrument to make the measurement value of the measuring instrument accurate.

[0045] The above are only the preferred embodiments of the present invention. Those skilled in the art will know that without departing from the spirit and scope of the present invention, various changes or equivalent substitutions can be made to these features and embodiments. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of the present invention.

Claims

1. A micro-leakage correction method based on a gravity valve, the correction method correcting a metering instrument provided with the gravity valve, characterized in that The calibration method includes the following steps: S100. After the controller of the metering instrument receives the electrical signal from the sensor, it identifies the position of the valve cover of the gravity valve and determines whether the valve cover and the valve seat are in a fully closed state and remain stationary. If so, step S200 is executed; otherwise, step S400 is executed. S200. The controller determines whether the flow signal output by the metering instrument is a zero flow signal. If so, step S400 is executed; otherwise, step S300 is executed. S300. The controller automatically calculates a compensation amount according to the flow signal, and the compensation amount makes the metering instrument output a zero flow signal, which is sent to the cumulative calculation link of the flow of the metering instrument. S400. End the calibration process. After the metering instrument is calibrated, it can also perform deterioration analysis.

2. A micro-leakage correction method based on a gravity valve according to claim 1, characterized in that The deterioration analysis includes the following steps: S100'. The metering instrument obtains the absolute value of the starting flow without compensation. S200'. The storage module provided in the metering instrument stores the absolute value of the starting flow without compensation. S300'. The controller compares the historical absolute values of the starting flow without compensation stored in the storage module to determine whether the metering characteristics of the metering instrument have deteriorated. If so, step S400' is executed; otherwise, step S500' is executed. S400'. The controller sends a signal to the remote end to repair or replace the metering instrument. S500'. End the deterioration analysis.

3. A micro-leakage correction method based on a gravity valve according to claim 1, characterized in that, Before S100, it also includes: S10. The controller determines whether there is flow passing through the metering instrument. If so, step S20 is executed; otherwise, step S200 is executed. S20. The controller receives the real-time flow measured by the metering instrument and determines whether the real-time flow is always less than the set threshold within the set time period. If so, step S30 is executed; otherwise, step S400 is executed. S30. The controller controls the valve cover of the gravity valve to close the valve; the sensor provided on the gravity valve moves with the valve cover and generates an electrical signal and sends it to the controller.

4. A micro-leakage correction method based on a gravity valve according to claim 1, characterized in that S100 includes the following steps: S110a. The valve cover and the valve seat are in a fully closed state, and the controller obtains a first detection result that there is no leakage or seepage in the fluid passage. S110b. The valve cover and the valve seat are not in a fully closed state, and the controller obtains a second detection result that there is leakage or seepage in the fluid passage.

5. A micro-leakage correction method based on a gravity valve according to claim 4, characterized in that, After S110b, it includes the following steps: S120a. The controller calculates the leakage or seepage amount of the fluid in the fluid passage.

6. A micro-leakage correction method based on a gravity valve according to claim 5, characterized in that, After S110b, it also includes the following steps: S120b. When the controller determines that the leakage or seepage in the fluid passage reaches the set warning time, the controller issues an alarm message.

7. A gravity valve, characterized in that, The gravity valve is used in a micro-leakage correction method based on a gravity valve according to any one of claims 1-6. The gravity valve includes a valve seat (1), a valve cover (2), and a control motor (3); a joint port (11) is provided on the valve seat (1); the joint port (11) matches the valve cover (2); the control motor (3) is a micro-power switch valve motor that can control the movement of the valve cover (2) to change the on-off state of the gravity valve; the control motor (3) and the valve seat (1) are fixedly connected.

8. A gravity valve according to claim 7, characterized in that, The inside of the joint port is trapezoidal; the interface surface (21) of the valve cover (2) is an inclined surface.

9. A gravity valve according to claim 8, characterized in that, The gravity valve further includes a support rod (5) and a rotating shaft (6); the support rod (5) connects the valve cover (2) and the control motor (3); the support rod (5) is movably connected to the control motor (3) through the rotating shaft (6).

10. A measuring instrument, characterized in that, The metering instrument includes the gravity valve according to any one of claims 7-9, and the metering instrument can measure the flow rate of the fluid in the fluid passage.

Images