CN114659730A - Leakage detection device and detection method for shutoff valve - Google Patents
Leakage detection device and detection method for shutoff valve Download PDFInfo
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- CN114659730A CN114659730A CN202210260952.1A CN202210260952A CN114659730A CN 114659730 A CN114659730 A CN 114659730A CN 202210260952 A CN202210260952 A CN 202210260952A CN 114659730 A CN114659730 A CN 114659730A
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- 238000001514 detection method Methods 0.000 title claims abstract description 101
- 239000007788 liquid Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000000691 measurement method Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
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Abstract
The invention discloses a leakage detection device and a detection method of a shut-off valve, which comprises a left flange, a right flange, a connecting piece, a bent pipe and a detection head, wherein the left flange and the right flange are respectively arranged at a water inlet and a water outlet of the detected valve and are connected by the connecting piece; one end of the elbow is connected with the right flange and is communicated with the water outlet of the detected valve, the other end of the elbow is detachably connected with the detection head, and the opening of the detection head faces upwards; the volume of the overflowing medium of each drop is measured, the number of the leaked drops of the detected valve is counted, the leakage amount is calculated, and the volume of the medium collected by the liquid collecting part is calculated, so that the error of measured data is prevented. The detection device has simple structure and low cost, and is beneficial to equipment popularization.
Description
Technical Field
The invention relates to the field of valve leakage detection, in particular to a leakage amount detection device and a detection method for a shutoff valve.
Background
The shutoff type valve plays a role in controlling fluid flow and blocking in a fluid system, the requirement on the sealing performance of the shutoff type valve is high, and valves in different fields and valves under different working condition requirements have different requirements on the leakage grade of the valves. Some shutoff-type valves require zero leakage, while some shutoff-type valves, particularly hard-seal shutoff-type valves, classify the leakage of the valve into different classes. Zero leakage is the highest level and not all valves require zero leakage under different field conditions. And aiming at the requirements of different leakage grades, whether the valve meets the requirements or not is judged. The valve tightness test is required at the factory. The requirement of zero leakage is relatively easy to observe. A zero leakage can be determined without any visible media outflow. But for other levels of leakage, a valve that allows a certain amount of leakage, once the valve leaks, how much the amount of leakage is detected. Whether the standard leakage quantity requirement is met is a problem which is difficult to solve in the industry.
The traditional method is to use a syringe to extract leaked liquid, and accurate extraction is difficult. Great care, and even carelessness, is required to drain some of the liquid. Making the detection of leaks inaccurate. For a small leak, such as a drop, the syringe is not as delicate and the fluid is easily lost through the syringe tubing. Resulting in unreliable accuracy of the measurement. Often there is much leakage, while the actual measured value is not that much. Resulting in failure of the actual valve. Or it is difficult to persuade the user. The user's question cannot be clarified.
Disclosure of Invention
Aiming at overcoming the defects in the prior art, the invention mainly aims to overcome the defects in the prior art and discloses a detection device for the leakage of a shutoff valve, which comprises a left flange, a right flange, a connecting piece, a bent pipe and a detection head, wherein the left flange and the right flange are respectively arranged at the water inlet and the water outlet of the detected valve and are connected with the left flange and the right flange by the connecting piece, and the left flange is connected with a water source and is connected with the water inlet of the detected valve; one end of the elbow is connected with the right flange and is communicated with the water outlet of the detected valve, the other end of the elbow is detachably connected with the detection head, and the opening of the detection head is upward;
the detection head comprises a body, a liquid outlet hole penetrating through the body is axially formed in the body, and a liquid collecting portion is arranged on the side wall of the body and used for collecting media flowing out of the liquid outlet hole.
Further, the lower extreme of body is the concave connecting portion of establishing, the inner wall of connecting portion the outer wall screw-thread fit of return bend.
Further, the upper end of the body is in a cone frustum shape.
Further, the connecting member includes a bolt and a nut.
Further, a plurality of the connecting pieces are distributed on the same circumference.
The detection method for the leakage of the shut-off valve comprises the following steps of:
s1, selecting a detection head with a required size, and measuring the volume of one drop of medium leaked from the detection heads with different sizes;
s2, installing a detection head with the minimum size in the required size to detect the leakage amount; if the leakage state exists, selecting a detection head with the maximum size in the required size to detect the leakage amount of the detected valve; if the leakage amount is less than one drop within the specified detection time, replacing the detection head with a smaller size for detection; calculating the leakage amount in a specified time according to the volume of one drop leaked from the detection head with the corresponding size calculated in the step S1; and if the leakage quantity is higher in precision, selecting the detection head with the minimum size within the required size for detection.
Further, the specific measurement method of step S1 includes the steps of:
s11, installing the corresponding detection head on the bent pipe, and installing the detected valve in the detection device;
s12, before the leakage quantity is detected, the valve is opened, the medium flows through the detected valve and the bent pipe, and the valve is closed after the whole bent pipe is filled with the medium;
s13, cleaning the liquid collecting part and keeping the liquid collecting part dry;
s14, slowly opening the valve to make the medium overflow from the detecting head drop by drop, and counting the medium to reach the target drop number X;
s15, all media in the liquid collecting part are taken out and put into a volume measuring vessel, and the total volume V of the target drop number is calculatedGeneral assemblyAccording to the formula V, mono ═ VGeneral assemblyX, calculating the volume V of a single drop of mediumSheet。
Further, in step S12, when the medium fills the entire elbow and just one drop of the medium overflows, the valve is closed.
Further, the specific measurement method of step S2 includes the steps of:
s21, opening the detected valve to make the medium fill the whole bend pipe and then close the valve; cleaning the liquid collecting part and keeping the liquid collecting part dry;
s22, pressurizing the inlet end of the detected valve, maintaining the pressure after the target pressure required by the test is reached, and setting the pressure maintaining time according to the test requirement;
s23, observing the number X of medium drops from one position of the detection head in the pressure keeping timeMeasuring；
S24, after reaching the pressure maintaining time, according to the formula VSide surveyX isMeasuringAnd further obtaining the volume of the leaked medium;
s25, collecting the medium in the liquid collecting part, and carrying out volume measurement on the medium by a volume measuring vessel to obtain VCore(ii) a Through VCoreAnd VMeasuringComparing, if the difference is within one drop of medium volume, indicating VMeasuringThe data is valid.
Further, in step S21, when the medium fills the entire elbow and just one drop of the medium overflows, the valve is closed.
The invention has the following beneficial effects:
the detection device has simple structure and low cost, and is beneficial to equipment popularization. The overflow medium is collected through the matching of the liquid outlet hole and the liquid collecting part of the detection head; the detection method can be used for carrying out error-proof judgment on the leakage amount calculated by the number of the drops by counting the overflowing medium and calculating the leakage amount according to the volume of each drop, and can be used for carrying out volume measurement on the medium collected by the liquid collecting part so as to ensure the accuracy of the measured data. The detection head is arranged to be of a detachable structure, and the detection head with different diameter liquid through holes is replaced to match with valves with different calibers, so that accurate leakage can be measured. And the detection precision can be improved by replacing the detection head with the liquid through hole with a smaller diameter.
Drawings
FIG. 1 is a right side view of a shut-off type valve leak detection device of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
the reference numbers are as follows:
1. the device comprises a left flange, a right flange, a connecting piece, a bent pipe, a detection head, a detected valve, a detection head, a bolt, a detection head body, a detection head body, a liquid outlet, a connection part, and a liquid collection part.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model provides a detection apparatus that shutoff type valve leaked, as shown in fig. 1-2, including left flange 1, right flange 2, connecting piece 3, return bend 4 and detection head 5, left flange 1 connects the water inlet that is detected by valve 9, right flange 2 connects the delivery port that is detected by valve 9, left flange 1 and right flange 2 pass through connecting piece 3 fixed connection, and make left flange 1, right flange 2 respectively with be detected the butt joint face zonulae occludens of valve 9, in order to prevent that the medium from overflowing from left flange 1 and being detected valve 9, the right flange 2 and being detected the joint gap between the valve 9, and then the influence leaks the volume and detects. Wherein, left flange 1 is connected with the water source, and right flange 2 is connected return bend 4 to the other end detachable of return bend 4 installs and detects 5, and detects that the opening of head 5 upwards.
The detection head 5 includes a body 51, a liquid outlet 52 is axially disposed on the body 51, and a liquid collecting portion 54 is disposed on a side wall of the body 51 for collecting a medium overflowing from the liquid outlet 52.
In one embodiment, as shown in fig. 1-2, the lower end of the body 51 is recessed with a connection portion 53, and the connection portion 53 is threadedly engaged with the elbow 4; specifically, the inner wall of the connecting portion 53 is provided with an internal thread, and the outer wall of the elbow 4 is provided with an external thread which is matched with the internal thread, so that the elbow 4 is quickly connected with the detection head 5. In order to improve the sealing performance between the elbow 4 and the detection head 5, a seal ring is mounted on the top end of the elbow 4.
In one embodiment, as shown in fig. 1-2, the upper end of the body 51 is in the shape of a truncated cone; after the medium emerges from the upper end of the detection head 5, the medium quickly falls into the liquid collecting part 54 by using the conical inclined surface; if the upper end of the body 51 is a plane, part of the medium may remain, and the final leakage amount detection may be affected.
In one embodiment, as shown in fig. 1-2, the connecting member 3 includes bolts 31 and nuts 32, the left flange 1 is provided with a plurality of first fixing holes at intervals along the circumferential direction thereof, and is provided with second fixing holes at corresponding positions, the bolts 31 pass through the first fixing holes and the second fixing holes and protrude from the second fixing holes, and are connected with the nuts 32. By turning the nut 32 so that the left flange 1 and the right flange 2 will be clamped by the valve to be tested.
In one embodiment, as shown in fig. 1-2, several connectors 3 are distributed on the same circumference. Preferably, the connecting members 3 are equally spaced. At this time, one of the first fixing holes can be aligned with any one of the second fixing holes and fixed by the connecting piece 3, and then the other first fixing holes are aligned with the second fixing holes, thereby completing the installation of the detected valve.
In one embodiment, as shown in fig. 1-2, the edges of the left and right flanges 1, 2 are square. Of course, it may also be circular or polygonal.
The invention also discloses a detection method for the leakage of the shutoff valve, and the detection device comprises the following steps:
s1, selecting a detection head with a required size, and measuring the volume of one drop of medium leaked from the detection heads with different sizes; in particular, the method comprises the following steps of,
s11, installing the corresponding detection head on the bent pipe, and installing the detected valve in the detection device;
s12, before detecting a drop of leakage quantity, opening the valve, and closing the valve after the medium flows through the detected valve and the bent pipe until the whole bent pipe is filled with the medium;
s13, cleaning the liquid collecting part and keeping the liquid collecting part dry;
s14, slowly opening the valve to make the medium overflow from the detecting head drop by drop, and counting the medium to reach the target drop number X;
s15, all the media in the liquid collecting part are taken out and put into a volume measuring vessel, and the total volume V of the target drop number is calculatedGeneral assemblyAccording to the formula V, mono ═ VGeneral assemblyX, calculating the volume V of a single drop of mediumSheet。
S2, installing a detection head with the minimum size in the required size to detect the leakage amount; if the leakage state exists, selecting a detection head with the maximum size in the required size to detect the leakage amount of the detected valve; if the leakage amount is less than one drop within the specified detection time, replacing the detection head with a smaller size for detection; calculating the leakage amount in a specified time according to the volume of one drop leaked from the detection head with the corresponding size calculated in the step S1; and if the leakage quantity is higher in precision, selecting the detection head with the minimum size within the required size for detection.
S21, opening the detected valve to make the medium fill the whole bend pipe and then close the valve; cleaning the liquid collecting part and keeping the liquid collecting part dry;
s22, pressurizing the inlet end of the detected valve, maintaining the pressure after the target pressure required by the test is reached, and setting the pressure maintaining time according to the test requirement;
s23, observing the number X of medium drops from one position of the detection head in the pressure keeping timeMeasuring；
S24, after reaching the pressure maintaining time, according to the formula VMeasuringX isSide surveyAnd further obtaining the volume of the leaked medium;
s25, collecting the medium in the liquid collecting part, and carrying out volume measurement on the medium by a volume measuring vessel to obtain VCore(ii) a Through VCoreAnd VMeasuringComparing, if the difference is within one drop of medium volume, indicating VMeasuringThe data is valid.
In step S12, when the medium fills the entire elbow and just one drop of the medium overflows, the valve is closed.
In step S21, when the medium fills the entire elbow and just one drop of the medium overflows, the valve is closed.
In the above embodiment, the detection head 5 is replaceable, so as to replace the detection heads 5 with different diameter liquid through holes to deal with the detection of valves with different calibers. In particular, for small diameter valves, the internal diameter of the test head may be relatively large, and once leaked, the amount of leakage may be less than one drop. It is difficult to calculate the leakage, but it is obvious that the medium is higher than the upper end surface of the detection head, and the medium is raised but does not flow down. For this case, the inner diameter of the detection head can be reduced. For example, the inner diameter of the detection head can be divided into several steps, 5mm, 4mm, 3mm, 2mm steps and the like. This can increase the different detection ranges. For the leakage detection of valves with different calibers, the detection heads with different inner diameters can be replaced, so that for the leakage with less than one drop, the leakage amount with less than one drop can be reduced by reducing the inner diameter of the detection head, and the leaked medium can flow out by replacing the small-caliber detection head. The leakage amount of the valves with different calibers can be accurately detected. The leakage rate measurement of valves with different calibers and different leakage amounts is realized by replacing the detection head of the measuring device.
The above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; it is intended that the following claims be interpreted as including all such alterations, modifications, and equivalents as fall within the true spirit and scope of the invention.
Claims (10)
1. The detection device for the leakage of the shutoff valve is characterized by comprising a left flange, a right flange, a connecting piece, a bent pipe and a detection head, wherein the left flange and the right flange are respectively arranged at a water inlet and a water outlet of a detected valve and are connected by the connecting piece, the left flange is connected with a water source and is connected with the water inlet of the detected valve; one end of the elbow is connected with the right flange and is communicated with the water outlet of the detected valve, the other end of the elbow is detachably connected with the detection head, and the opening of the detection head is upward;
the detection head comprises a body, a liquid outlet hole penetrating through the body is axially formed in the body, and a liquid collecting portion is arranged on the side wall of the body and used for collecting media flowing out of the liquid outlet hole.
2. A valve shut-off type valve leak detection device according to claim 1, wherein the lower end of the body is recessed with a connection portion, the inner wall of the connection portion is in threaded engagement with the outer wall of the elbow.
3. The device for detecting the leakage of the shutoff type valve according to claim 1, wherein the upper end of the body is in a cone frustum shape.
4. A detection arrangement for leak in a shut-off type valve according to claim 1, wherein said connection member comprises a bolt and a nut.
5. A valve shut-off type valve leak detection device as claimed in claim 1, wherein said plurality of said connecting members are arranged on a common circumference.
6. A method for detecting leakage of a shut-off type valve, using the detection device of any one of claims 1 to 5, comprising the steps of:
s1, selecting a detection head with a required size, and measuring the volume of one drop of medium leaked from the detection heads with different sizes;
s2, installing a detection head with the minimum size in the required size to detect the leakage amount; if the leakage state exists, selecting a detection head with the maximum size in the required size to detect the leakage amount of the detected valve; if the leakage amount is less than one drop within the specified detection time, replacing the detection head with a smaller size for detection; calculating the leakage amount in a specified time according to the volume of one drop leaked from the detection head with the corresponding size calculated in the step S1; and if the leakage quantity is higher in precision, selecting the detection head with the minimum size within the required size for detection.
7. The method for detecting leakage of a shut-off type valve according to claim 6, wherein the specific measurement method of the step S1 comprises the following steps:
s11, installing the corresponding detection head on the bent pipe, and installing the detected valve in the detection device;
s12, before the leakage quantity is detected, the valve is opened, the medium flows through the detected valve and the bent pipe, and the valve is closed after the whole bent pipe is filled with the medium;
s13, cleaning the liquid collecting part and keeping the liquid collecting part dry;
s14, slowly opening the valve to make the medium overflow from the detecting head drop by drop, and counting the medium to reach the target drop number X;
s15, all the media in the liquid collecting part are taken out and put into a volume measuring vessel, and the total volume V of the target drop number is calculatedGeneral assemblyAccording to the formula V, mono ═ VGeneral assemblyX, calculating the volume V of a single drop of mediumSheet。
8. The method for detecting leakage of a shut-off valve according to claim 7, wherein in step S12, when the medium fills the entire elbow and just one drop of the medium overflows, the valve is closed.
9. The method for detecting leakage of the shut-off type valve according to claim 6, wherein the specific measurement method in the step S2 comprises the following steps:
s21, opening the detected valve to make the medium fill the whole bend pipe and then close the valve; cleaning the liquid collecting part and keeping the liquid collecting part dry;
s22, pressurizing the inlet end of the detected valve, maintaining the pressure after the target pressure required by the test is reached, and setting the pressure maintaining time according to the test requirement;
s23, observing the number X of medium drops from one position of the detection head in the pressure keeping timeMeasuring；
S24, after reaching the pressure maintaining time, according to the formula VMeasuringX isMeasuringAnd further obtaining the volume of the leaked medium;
s25, collecting the medium in the liquid collecting part, and carrying out volume measurement on the medium by a volume measuring vessel to obtain VCore(ii) a Through VCoreAnd VMeasuringComparing, if the difference is within one drop of medium volume, V is indicatedMeasuringThe data is valid.
10. The method for detecting leakage of a shut-off valve according to claim 9, wherein in step S21, when the medium fills the entire elbow and just one drop of the medium overflows, the valve is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210260952.1A CN114659730A (en) | 2022-03-16 | 2022-03-16 | Leakage detection device and detection method for shutoff valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210260952.1A CN114659730A (en) | 2022-03-16 | 2022-03-16 | Leakage detection device and detection method for shutoff valve |
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| Publication Number | Publication Date |
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| CN114659730A true CN114659730A (en) | 2022-06-24 |
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|---|---|---|---|
| CN202210260952.1A Pending CN114659730A (en) | 2022-03-16 | 2022-03-16 | Leakage detection device and detection method for shutoff valve |
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| CN (1) | CN114659730A (en) |
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- 2022-03-16 CN CN202210260952.1A patent/CN114659730A/en active Pending
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