CN114135796A - Fluid leakage amount detector and detection method - Google Patents
Fluid leakage amount detector and detection method Download PDFInfo
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- CN114135796A CN114135796A CN202111580799.2A CN202111580799A CN114135796A CN 114135796 A CN114135796 A CN 114135796A CN 202111580799 A CN202111580799 A CN 202111580799A CN 114135796 A CN114135796 A CN 114135796A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
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Abstract
The application provides a fluid leakage detector and a detection method, wherein the detector comprises a cylinder body, a piston, a displacement sensor and a central processing unit for calculating the fluid leakage according to the displacement of the piston; the piston is positioned in the cylinder body and divides the inner cavity of the cylinder body into a first cavity and a second cavity; the first cavity is communicated with a fluid pipeline to be detected through a transmission pipeline; the first cavity is used for collecting fluid leaked from the fluid pipeline to be detected; the displacement sensor is connected with the tail end of the piston; the central processing unit is electrically connected with the displacement sensor; the displacement sensor detects the moving distance of the piston, and the central processing unit obtains the fluid leakage amount according to the moving distance of the piston. The fluid collection box can be used for detecting the sealing performance of valve body equipment, solves the problem that the fluid leakage amount of conventional flowmeter detection equipment cannot be used at present, and can recover the fluid leaked by the equipment into the fluid collection box by means of peripheral equipment to prevent pollution to the environment.
Description
Technical Field
The present disclosure relates to fluid leakage detection technologies, and particularly to a fluid leakage detector and a fluid leakage detection method.
Background
At present, when the flow rate of fluid (such as water, oil and the like) is large, a flowmeter is generally adopted for detecting the leakage amount of the fluid; however, when the fluid leaks intermittently and has a very low flow rate, even when the fluid leaks, the fluid cannot drive the internal parts of the flowmeter to rotate, so that the flowmeter cannot give an accurate detection result. The current popular fluid leakage detection method is to measure out the leaked medium directly by using a measuring cup, but the manual measurement method is inconvenient to operate, and can cause pollution to human bodies and the surrounding environment when the measuring cup overflows due to the large leakage amount.
Therefore, how to accurately measure the leakage amount of the fluid with intermittent leakage and extremely small flow rate, even when the fluid is leaked by dripping, and the technical problems to be solved are to improve the automation degree of detection and to prevent the environment from being polluted.
Disclosure of Invention
The utility model aims at providing a fluid leakage quantity detector and detection method, the fluid exists intermittent leakage and the velocity of flow is minimum, even the leakage quantity when dribbling carries out accurate measurement, improves the degree of automation that detects, prevents the polluted environment.
In order to achieve the above object, the present application provides a fluid leakage detector, comprising a cylinder, a piston, a displacement sensor and a central processing unit for calculating a fluid leakage according to a displacement of the piston; the piston is positioned in the cylinder body and divides the inner cavity of the cylinder body into a first cavity and a second cavity; the first cavity is communicated with a fluid pipeline to be detected through a transmission pipeline; the displacement sensor is connected with the tail end of the piston; the central processing unit is electrically connected with the displacement sensor.
As above, a control valve is installed on the transmission pipeline connecting the first cavity and the fluid pipeline to be detected.
As above, wherein the control valve is an electromagnetic control valve electrically connected to the central processing unit.
As above, the displacement sensor is a grating displacement sensor, and a scale grating of the grating displacement sensor is fixedly connected to the tail end of the piston.
As above, the cylinder body further has a through long piston guide rod, the piston guide rod is fixed in the cylinder body along the moving direction of the piston, the piston is sleeved outside the piston guide rod, and the piston is connected with the piston guide rod in a sliding manner.
The above, the initial position of the piston is located at a side of the first cavity connected to the fluid pipeline to be detected, and under the increase of the fluid in the first cavity, the piston moves in the direction toward the second cavity until the space moved to the second cavity disappears.
The fluid leakage detector also comprises a fluid collecting box; when the space of the second cavity disappears, the fluid collecting box is communicated with the first cavity through a recovery pipeline; when the space of the second cavity is not disappeared, the fluid collecting box is communicated with the second cavity through a recovery pipeline.
As above, one end of the cylinder body close to the second cavity has an opening, one side of the piston close to the second cavity is fixed with a piston rod, the piston rod is arranged along the moving direction of the piston, the piston rod penetrates out of the opening, and one end of the piston rod far away from the piston is fixedly connected with the displacement sensor.
The above, wherein the piston rod is hollow inside, and the piston guide rod penetrates into the hollow of the piston rod.
As above, wherein the grating displacement sensor includes a light receiving element provided on one side of the cylinder in a direction parallel to the moving direction of the piston, the central processing unit being electrically connected to the light receiving element.
The beneficial effect that this application realized is as follows:
(1) this application utilizes fluid self pressure drive piston to remove, and displacement sensor detects piston displacement to calculate the fluid according to piston displacement volume and piston sectional area and reveal the volume a little, degree of automation is high and detection accuracy is high, and, can realize the measurement to the small leakage volume of waiting to detect the pipeline.
(2) The method and the device avoid the situation that the detection process cannot be controlled and continued due to 'spray leakage' caused by sudden failure of the tested equipment, and can recycle the fluid leaked out of the equipment into the oil tank by means of peripheral equipment, thereby reducing the pollution to the detection environment.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic structural diagram of a fluid leakage detector according to an embodiment of the present disclosure.
Fig. 2 is a side view of a piston and piston guide rod of an embodiment of the present application.
Reference numerals: 1-a cylinder body; 2-a piston; 3-a displacement sensor; 4-a control valve; 5-a central processing unit; 6-fluid collection box; 11-a first cavity; 12-a second cavity; 21-a piston guide rod; 22-a piston rod; 31-scale grating; 32-a light-receiving element; 61-recovery line.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
As shown in fig. 1, the present application provides a fluid leakage amount detector including a cylinder 1, a piston 2, a displacement sensor 3, and a central processing unit 5 for calculating a fluid leakage amount from a displacement amount of the piston 2; the cylinder body 1 is cylindrical, the piston 2 is positioned in the cylinder body 1 and divides an inner cavity of the cylinder body 1 into a first cavity 11 and a second cavity 12; the first cavity 11 is communicated with a fluid pipeline to be detected through a transmission pipeline; the displacement sensor 3 is connected with the tail end of the piston 2; the central processing unit 5 is electrically connected to the displacement sensor 3.
As a specific embodiment of the present invention, when detecting the fluid leakage amount, the first cavity 11 is communicated with a fluid pipeline to be detected through a transmission pipeline, the fluid with the fluid pipeline leakage to be detected flows into the first cavity 11 through the transmission pipeline, as the fluid in the first cavity 11 increases, the piston 2 moves towards the second cavity 12 under the pressure of the fluid, the displacement sensor 3 senses the movement amount of the piston 2, the central processing unit 5 collects the displacement of the piston 2 sensed by the displacement sensor 2, and calculates the fluid micro leakage amount according to the displacement of the piston 2 and the cross-sectional area of the piston 2, thereby accurately detecting the micro leakage amount of the fluid pipeline to be detected.
As shown in fig. 1, a control valve 4 is installed on a transmission pipeline connecting the first cavity 11 and the fluid pipeline to be detected. In this embodiment, the first cavity 11 is mainly used for receiving leakage fluid, and when there is a slight leakage, the leakage fluid pushes the piston 2 to move towards the second cavity 12. The control valve 4 is used to open or block the passage of leakage fluid to the first chamber 11.
Preferably, the control valve 4 is an electromagnetic control valve electrically connected to the central processing unit 5. The solenoid control valve is opened or closed according to the electric signal of the central processing unit 5, so as to open or block the passage of the leakage fluid to the first cavity 11.
Preferably, the displacement sensor 3 is a grating displacement sensor, and a scale grating 31 of the grating displacement sensor is fixedly connected with the tail end of the piston 2. The grating displacement sensor is used to measure the displacement of the piston 2. When the piston 2 moves towards the second cavity 12 under the pressure of the leaked fluid, the piston 2 drives the scale grating 31 to move synchronously, so that the displacement of the piston 2 can be obtained by measuring the displacement of the scale grating 31.
As shown in fig. 1, the cylinder 1 further has a piston guide rod 21 extending through the cylinder, the piston guide rod 21 is fixed in the cylinder 1 along the moving direction of the piston 2, the piston 2 is sleeved outside the piston guide rod 21, and the piston 2 is slidably connected to the piston guide rod 21. The piston guide rod 21 guides the direction of movement of the piston 2, facilitating more accurate acquisition of the amount of displacement of the piston 2.
As a specific embodiment of the present invention, the initial position of the piston 2 is located at a side of the first cavity 11 connected to the fluid pipeline to be detected, and under the increase of the fluid in the first cavity 11, the piston 2 moves in the direction toward the second cavity 12 until the space moving to the second cavity 12 disappears.
As shown in fig. 1, the fluid leakage amount detector further includes a fluid collection tank 6; when the space of the second cavity 12 disappears, the fluid collection tank 6 is communicated with the first cavity 11 through the recovery pipeline 61; when the space of the second chamber 12 is not disappeared, the fluid collection tank 6 communicates with the second chamber 12 through the recovery line 61. After the detection is finished, the fluid in the cylinder body 1 can be discharged into the fluid collection tank 6 through the recovery pipeline 61; or when the fluid in the cylinder body 1 is filled with the whole cylinder body 1 and the space of the second cavity 12 disappears, the fluid can be discharged into the fluid collection box 6 through the recovery pipeline 61, so that the fluid is prevented from flowing into the surrounding environment, and the environment is prevented from being polluted.
As shown in fig. 1, an opening is formed at one end of the cylinder 1 close to the second cavity 12, a piston rod 22 is fixed at one side of the piston 2 close to the second cavity 12, the piston rod 22 is arranged along the moving direction of the piston 2, the piston rod 22 penetrates out of the opening, and one end of the piston rod 22 far away from the piston 2 is fixedly connected with the displacement sensor 3.
As an embodiment of the present invention, the piston rod 22 is hollow inside, and the piston guide rod 21 penetrates into the hollow of the piston rod 22. The piston 2 and the piston rod 22 are movable along the piston guide rod 21.
As shown in fig. 1, the grating displacement sensor includes a light receiving element 32, the light receiving element 32 is provided on one side of the cylinder 1 in parallel with the moving direction of the piston 2, and the central processing unit 5 is electrically connected to the light receiving element 32. The light receiving element 32 senses the amount of displacement of the scale grating 31.
The central processing unit 5 includes a CPU, a signal conditioning circuit, and a power supply, which are all in the prior art and are not described herein again.
As an embodiment of the present invention, the central processing unit 5 collects a first displacement amount of the piston 2 per unit time, and takes a product of the first displacement amount and a sectional area of the first cavity 11 as a fluid micro-leakage amount. The cross-sectional area of the first chamber 11 is the area of the piston 2 minus the cross-sectional area of the piston guide rod 21.
As a specific embodiment of the present invention, the design of the volume of the cylinder 1 is associated with a detection threshold, specifically, the maximum flow rate of the fluid that the cylinder 1 can accommodate is equal to the preset detection threshold, and if the leakage amount of the fluid does not reach the threshold, after the detection is completed, the piston 2 is automatically controlled to be reset to the leftmost initial position of the cylinder 1; if the leakage of fluid has exceeded the threshold value, the piston 2 has reached the rightmost side of the cylinder 1 and the leaked fluid flows back into the fluid collection tank 6 via the recovery line 61.
As shown in FIG. 2, which is a side view of the piston 2 and the piston guide rod 21, the piston 2 and the piston guide rod 21 are both circular in longitudinal sectional shape, and d in FIG. 21The diameter of the piston 2; d2Showing the diameter of the piston guide rod 21. The center axis of the piston guide rod 21 is in the same linear direction as the center axis of the piston 2.
Example two
A fluid leakage amount detection method using a fluid leakage amount detector for detection, the detection method comprising the steps of:
moving the piston 2 to an initial position, and communicating the fluid pipeline to be detected with the first cavity 11 through a transmission pipeline;
the first cavity 11 collects the fluid leaked from the fluid pipeline to be detected; the piston 2 moves in a direction away from the first cavity 11 along with the increase of the fluid in the first cavity 11;
the displacement sensor 3 acquires the moving distance of the piston 2;
calculating the fluid leakage amount in real time by adopting a differential calculation formula according to the moving distance of the piston 2;
wherein, the differential calculation formula is:
V＝∫Sdx＝∫[π×(d1 2-d2 2)/4]dx；
wherein V represents the total fluid leakage; integral sign is represented by ^ integral; s represents an annular sectional area between the piston 2 and the cylinder 1; dx represents the moving distance of the piston; d1The diameter of the piston 2; d2Showing the diameter of the piston guide rod 21.
The specific detection principle of the fluid leakage amount is as follows:
when starting detection, the piston 2 and the scale grating 31 are at the first position (that is, the piston 2 is at the initial position), when the system to be detected leaks, the piston 2 is pushed to move in the cylinder 1 from left to right along the piston guide rod 21, and the diameter of the piston 2 is set as d1The diameter of the piston guide rod 21 is d2Then, the sectional area of the first cavity 11, that is, the annular sectional area S between the piston 2 and the cylinder 1, is calculated as follows:
S＝π×(d1 2-d2 2)/4。
wherein pi is 3.14.
According to the differential concept, when the system leaks, the piston 2 moves in the cylinder 1 to drive the scale grating 31 to generate displacement, and the micro volume dv generated by the displacement is calculated as follows:
dv＝S×dx。
wherein dx represents the moving distance of the piston; dv denotes the micro volume.
If the piston 2 moves in the cylinder 1 due to fluid leakage, the piston 2 and the scale grating 31 both move to the second position, and the total displacement from the first position (i.e. the piston 2 is at the initial position) to the second position is p, the total fluid leakage V at this time is calculated as follows:
V＝∫Sdx＝∫[π×(d1 2-d2 2)/4]dx；
wherein ^ represents an integral sign.
The central processing unit 5 reads the displacement of the piston 2, and the above calculations are completed in the CPU of the central processing unit 5, and the calculation results are output and displayed.
When the fluid leakage detector detects the leakage of a fluid pipeline to be detected, as long as tiny leakage occurs, the self pressure of fluid can drive the piston 2 to generate displacement, and the integral operation is carried out on the fixed sectional area between the piston 2 and the cylinder body 1 and the relative displacement of the piston 2 within a limited timing time, so that the fluid leakage (volume) within the limited time can be obtained. The method can be used for detecting the sealing performance of the valve body equipment, solves the problem that the micro leakage amount of the fluid in the conventional flowmeter detection equipment cannot be used at present, also changes the traditional mode that the detection can only be carried out by a measuring cup and manual reading at present, and provides a technical means for the micro leakage of the fluid in the automatic detection equipment.
The beneficial effect that this application realized is as follows:
(1) this application utilizes fluid self pressure drive piston to remove, and displacement sensor detects piston displacement to calculate the fluid according to piston displacement volume and piston sectional area and reveal the volume a little, degree of automation is high and detection accuracy is high, and, can realize the measurement to the small leakage volume of waiting to detect the pipeline.
(2) The method and the device avoid the situation that the detection process cannot be controlled and continued due to 'spray leakage' caused by sudden failure of the tested equipment, and can recycle the fluid leaked out of the equipment into the oil tank by means of peripheral equipment, thereby reducing the pollution to the detection environment.
The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A fluid leakage detector is characterized by comprising a cylinder, a piston, a displacement sensor and a central processing unit, wherein the central processing unit is used for calculating fluid leakage according to the displacement of the piston;
the piston is positioned in the cylinder body and divides the inner cavity of the cylinder body into a first cavity and a second cavity;
the first cavity is communicated with a fluid pipeline to be detected through a transmission pipeline; the first cavity is used for collecting fluid leaked from the fluid pipeline to be detected;
the displacement sensor is connected with the tail end of the piston;
the central processing unit is electrically connected with the displacement sensor;
when fluid enters the first cavity, the piston moves towards the direction of the second cavity, the displacement sensor detects the moving distance of the piston, and the central processing unit obtains the fluid leakage amount according to the moving distance of the piston.
2. The fluid leakage detector according to claim 1, wherein a control valve is installed on a transmission pipeline connecting the first cavity and the fluid pipeline to be detected, and the control valve controls on/off of the transmission pipeline.
3. The fluid leak detector according to claim 2, wherein the control valve is an electromagnetic control valve electrically connected to the central processing unit.
4. The fluid leakage detector of claim 3, wherein said displacement sensor is a grating displacement sensor, and a scale grating of said grating displacement sensor is fixedly connected to a rear end of said piston.
5. The fluid leakage detector according to claim 4, wherein a piston guide rod is further provided in said cylinder, said piston guide rod is fixed in said cylinder along a moving direction of said piston, said piston is disposed outside said piston guide rod, and said piston is slidably coupled to said piston guide rod.
6. The fluid leakage detector of claim 1, wherein the initial position of the piston is located at a side of the first chamber connected to the fluid line to be detected, and the piston moves in a direction toward the second chamber under the increase of the fluid in the first chamber until the space moved to the second chamber disappears.
7. The fluid leak detector of claim 1, further comprising a fluid collection tank;
when the space of the second cavity disappears, the fluid collecting box is communicated with the first cavity through a recovery pipeline; when the space of the second cavity is not disappeared, the fluid collecting box is communicated with the second cavity through a recovery pipeline.
8. The fluid leakage detector according to claim 5, wherein an opening is formed at one end of the cylinder body close to the second cavity, a piston rod is fixed at one side of the piston close to the second cavity, the piston rod is arranged along the moving direction of the piston and penetrates out of the opening, and one end of the piston rod far away from the piston is fixedly connected with the displacement sensor.
9. The fluid leakage amount detector according to claim 4, wherein the grating displacement sensor includes a light receiving element provided on one side of the cylinder in a direction parallel to a moving direction of the piston, the central processing unit being electrically connected to the light receiving element.
10. A method for detecting a fluid leakage amount by using the fluid leakage amount detector according to any one of claims 1 to 9, comprising the steps of:
moving the piston to an initial position, and communicating a fluid pipeline to be detected with the first cavity through a transmission pipeline;
the first cavity collects fluid leaked from the fluid pipeline to be detected; the piston moves towards the direction far away from the first cavity along with the increase of the fluid in the first cavity;
the displacement sensor acquires the moving distance of the piston;
calculating the fluid leakage amount in real time by adopting a differential calculation formula according to the moving distance of the piston;
wherein, the differential calculation formula is:
V＝∫Sdx＝∫[π×(d1 2-d2 2)/4]dx；
wherein V represents the total fluid leakage; integral sign is represented by ^ integral; s represents the annular cross-sectional area between the piston and the cylinder; dx represents the moving distance of the piston; d1Indicating the diameter of the piston; d2Indicating the diameter of the piston guide rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111580799.2A CN114135796A (en) | 2021-12-22 | 2021-12-22 | Fluid leakage amount detector and detection method |
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| CN202111580799.2A CN114135796A (en) | 2021-12-22 | 2021-12-22 | Fluid leakage amount detector and detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117167673A (en) * | 2023-11-03 | 2023-12-05 | 南通东来冶金装备有限公司 | Detection device for combustible gas leakage |
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2021
- 2021-12-22 CN CN202111580799.2A patent/CN114135796A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117167673A (en) * | 2023-11-03 | 2023-12-05 | 南通东来冶金装备有限公司 | Detection device for combustible gas leakage |
| CN117167673B (en) * | 2023-11-03 | 2023-12-26 | 南通东来冶金装备有限公司 | Detection device for combustible gas leakage |
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