阅读说明：本技术 液体泄漏流量检测装置、检测方法及换流阀 (Liquid leakage flow detection device, detection method and converter valve ) 是由 郑力 孟佳 张翔 赵赢峰 陈赤汉 李海英 于 2019-08-30 设计创作，主要内容包括：本公开提供一种液体泄漏流量检测装置、检测方法及换流阀。液体泄漏流量检测装置包括：容器,用于盛接泄漏的液体,包括进水口和出水口；液体检测模块,包括检测探头,检测探头与泄漏的液体接触产生信号,液体检测模块传送出信号；升降机构,用于将液体检测模块设置于容器上,并可调节检测探头相对于容器底部的高度。本公开的液体泄漏流量检测装置可调整泄漏流量阈值的大小,提升产品的适应性。(The disclosure provides a liquid leakage flow rate detection device, a liquid leakage flow rate detection method and a converter valve. The liquid leakage flow rate detection device includes: the container is used for containing leaked liquid and comprises a water inlet and a water outlet; the liquid detection module comprises a detection probe, the detection probe is contacted with leaked liquid to generate a signal, and the liquid detection module transmits the signal; and the lifting mechanism is used for arranging the liquid detection module on the container and adjusting the height of the detection probe relative to the bottom of the container. The liquid leakage flow detection device can adjust the size of the leakage flow threshold value and improve the adaptability of products.)

1. A liquid leakage flow rate detection device, comprising:

the container is used for containing leaked liquid and comprises a water inlet and a water outlet;

the liquid detection module comprises a detection probe, the detection probe is contacted with the leaked liquid to generate a signal, and the liquid detection module transmits the signal;

and the lifting mechanism is used for arranging the liquid detection module on the container and adjusting the height of the detection probe relative to the bottom of the container.

2. The fluid leak flow detection device of claim 1, wherein the water inlet is located at a top of the container and the water outlet is located at a bottom of the container.

3. The liquid leakage flow detection apparatus of claim 2, wherein the container further comprises a weir, the weir being positioned below the water inlet.

4. The fluid leak flow detection device of claim 1, wherein a strainer is disposed at the water inlet.

5. The fluid leakage flow sensing device of claim 1, wherein the container includes a mounting plate at a top end, and the lifting mechanism is coupled to the mounting plate.

6. The fluid leakage flow sensing device of claim 5, wherein the mounting plate has a threaded bore;

the lifting mechanism comprises:

a bearing located on a sidewall of the liquid detection module;

one end of the screw penetrates into the bearing, and the other end of the screw is in threaded connection with the threaded hole of the mounting plate;

and the locking nut is used for locking the screw rod which is adjusted in place.

7. The fluid leak flow detection device of claim 1, wherein a scale is marked on a sidewall of the container and/or a scale is marked on a sidewall of the fluid detection module.

8. The fluid leakage flow rate detection device of claim 1, wherein the number of fluid detection modules is multiple, and the height of the detection probe of each fluid detection module relative to the bottom of the container is a corresponding preset value.

9. The fluid leakage flow sensing device of claim 1, wherein a probe guard rail is disposed at a bottom of the fluid sensing module, and the sensing probe is located in a space defined by the probe guard rail.

10. The fluid leakage flow detection device of claim 1, further comprising a dust cap having a cavity therein, wherein the top of the fluid detection module is positioned in the cavity, and wherein the dust cap is coupled to the container;

the container also includes a drip pan for collecting leaked liquid and directing the leaked liquid into the water inlet.

11. A method of fluid leak flow detection, comprising:

introducing leaked liquid into a container from a water inlet, wherein the leaked liquid flows out of the container from a water outlet, the leakage flow rate is increased, and the liquid level in the container is increased;

if the leakage flow reaches a leakage flow threshold value, the liquid in the container is contacted with a detection probe of a liquid detection module, the detection probe generates a signal, and the signal is transmitted by the liquid detection module;

and if the leakage flow threshold value is adjusted, adjusting the height of the detection probe relative to the bottom of the container to correspond to the adjusted leakage flow threshold value.

12. The method for detecting liquid leakage flow according to claim 11, wherein the height h of the detection probe relative to the bottom of the container, the opening area a of the water outlet and the leakage flow threshold Q satisfy the following relation:

wherein g is the gravity acceleration and mu is the water outlet flow coefficient.

13. The method of liquid leak flow testing according to claim 12, wherein the height h of the test probe relative to the bottom of the container is calibrated by a simulated leak test by:

and (3) inputting liquid into the container, maintaining the input flow as the leakage flow threshold Q, and after the liquid level in the container stops rising and is stable, the stable liquid level height is the height h of the detection probe corresponding to the leakage flow threshold Q relative to the bottom of the container.

14. The method of claim 11, wherein if the leakage flow rate is greater than a maximum leakage flow rate threshold in the plurality of liquid detection modules, excess liquid in the container is drained from the overflow.

15. A converter valve comprising a valve tower and the liquid leakage flow rate detection device of any one of claims 1 to 10, wherein the liquid leakage flow rate detection device is located at the bottom of the valve tower.

Technical Field

The disclosure belongs to the field of power transmission equipment, and particularly relates to a liquid leakage flow detection device, a liquid leakage flow detection method and a converter valve.

Background

The direct current converter valve is a core device of extra-high voltage direct current transmission, and internal elements of the direct current converter valve are usually cooled by deionized circulating water. The liquid leakage detection device is arranged at the bottom of the valve tower of the converter valve and used for detecting whether the cooling water loop has leakage and the severity of the leakage, and the detection device generally reports the leakage in two grades of slight leakage and severe leakage. In the field of extra-high voltage direct current converter valve engineering, leakage flow of 10L/h is generally used as a slight leakage alarm, and leakage flow of 15L/h is used as a serious leakage alarm.

The early water leakage detection device can only detect whether water leakage exists, and the quantity and duration of the water leakage cannot be known. In recent years, the direct current converter valve tower water leakage detection device can realize real-time detection of leakage and judgment of leakage flow, but the judged threshold index is difficult to flexibly adjust. For example, patent CN102519689A, and the document "design and implementation of water leakage detection function of valve tower of high voltage dc transmission converter valve" (meng chow, wang hong qing, etc. are published in "electric measurement and instrumentation", 2016, 53 (12)). The leakage flow rate is related to the size of the bottom small hole and the length of the opening of the light barrier, and if the leakage flow rate corresponding to the leakage flow rate needs to be changed, the light barrier needs to be replaced or the size of the small hole needs to be changed. In actual processing, the size of the small hole cannot be absolutely accurate, and for the detection of the tiny leakage, the deviation of the flow rate of 1L/h is probably caused by the increase of the diameter of the small hole by 0.1mm, and flexible correction is difficult.

The floater that patent CN107817072A used floats and drives the pivot and rotate the scheme that certain angle arouses the light path dislocation, and the floater of using is very light, and its weight error also can influence the rotatory angle of floater under corresponding liquid level, and then leads to leaking the flow and judges inaccurately. In the actual production debugging, need carry out the judgement threshold value deviation that the counter weight was brought in order to adjust each part error to the floater, this kind of mode practice is got up the degree of difficulty and is got up for a long time. And if multi-stage flow judgment exists, independent threshold adjustment is difficult to perform in a decoupling mode.

Disclosure of Invention

The disclosure aims to provide a liquid leakage flow rate detection device, a liquid leakage flow rate detection method and a converter valve. The leakage flow threshold is flexibly adjusted by adjusting the height of the detection probe relative to the bottom of the container.

One embodiment of the present disclosure provides a liquid leakage flow rate detection device, including: the container is used for containing leaked liquid and comprises a water inlet and a water outlet; the liquid detection module comprises a detection probe, the detection probe is contacted with the leaked liquid to generate a signal, and the liquid detection module transmits the signal; and the lifting mechanism is used for arranging the liquid detection module on the container and adjusting the height of the detection probe relative to the bottom of the container.

According to some embodiments of the disclosure, the water inlet is located at a top of the container and the water outlet is located at a bottom of the container.

According to some embodiments of the disclosure, the container further comprises a weir, the weir being located below the water inlet.

According to some embodiments of the disclosure, a strainer is disposed at the water inlet.

According to some embodiments of the present disclosure, the container includes a mounting plate at a top end, the lift mechanism being coupled to the mounting plate.

According to some embodiments of the present disclosure, the mounting plate is provided with a threaded hole; the lifting mechanism comprises: a bearing located on a sidewall of the liquid detection module; one end of the screw penetrates into the bearing, and the other end of the screw is in threaded connection with the threaded hole of the mounting plate; and the locking nut is used for locking the screw rod which is adjusted in place.

According to some embodiments of the present disclosure, a scale is marked on a sidewall of the container, and/or a scale is marked on a sidewall of the liquid detection module.

According to some embodiments of the present disclosure, the number of the liquid detection modules is multiple, and the height of the detection probe of each liquid detection module relative to the bottom of the container is a corresponding preset value.

According to some embodiments of the present disclosure, a probe guardrail is disposed at a bottom of the liquid detection module, and the detection probe is located in a space defined by the probe guardrail.

According to some embodiments of the present disclosure, the liquid leakage flow rate detection device further comprises a dust cover, a cavity is formed inside the dust cover, the top of the liquid detection module is located in the cavity, and the dust cover is connected to the container; the container also includes a drip pan for collecting leaked liquid and directing the leaked liquid into the water inlet.

An embodiment of the present disclosure also provides a method for detecting a liquid leakage flow rate, including: introducing leaked liquid into a container from a water inlet, wherein the leaked liquid flows out of the container from a water outlet, the leakage flow rate is increased, and the liquid level in the container is increased; if the leakage flow reaches a leakage flow threshold value, the liquid in the container is contacted with a detection probe of a liquid detection module, the detection probe generates a signal, and the signal is transmitted by the liquid detection module; and if the leakage flow threshold value is adjusted, adjusting the height of the detection probe relative to the bottom of the container to correspond to the adjusted leakage flow threshold value.

According to some embodiments of the present disclosure, the height h of the detection probe relative to the bottom of the container, the opening area a of the water outlet and the leakage flow threshold Q satisfy the relation:wherein g is the gravity acceleration and mu is the water outlet flow coefficient.

According to some embodiments of the present disclosure, the height h of the detection probe relative to the bottom of the container is calibrated by a simulated leak test: and (3) inputting liquid into the container, maintaining the input flow as the leakage flow threshold Q, and after the liquid level in the container stops rising and is stable, the stable liquid level height is the height h of the detection probe corresponding to the leakage flow threshold Q relative to the bottom of the container.

According to some embodiments of the disclosure, if the leakage flow rate is greater than a maximum leakage flow rate threshold in the plurality of liquid detection modules, excess liquid in the container is drained by an overflow vent.

An embodiment of the present disclosure also provides a converter valve, including a valve tower and the liquid leakage flow rate detection device as described above, where the liquid leakage flow rate detection device is located at the bottom of the valve tower.

The disclosed liquid leakage flow detection device and detection method adjust the height of the detection probe relative to the bottom of the container through the lifting mechanism; the size of the leakage flow threshold of the liquid can be flexibly and conveniently adjusted; the applicability of the product is greatly improved, the production and field debugging efficiency is improved, the technical level requirements of installation and debugging personnel are reduced, and the maintenance convenience is improved.

Drawings

FIG. 1 is a schematic view of a fluid leakage flow sensing device according to one embodiment of the present disclosure;

FIG. 2 is a bottom schematic view of a fluid leakage flow sensing device according to one embodiment of the present disclosure;

FIG. 3 is an exploded view of a fluid leakage flow sensing device according to one embodiment of the present disclosure;

FIG. 4 is a schematic view of a liquid detection module according to one embodiment of the present disclosure;

FIG. 5 is a schematic view of a dust cap installation according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a method of fluid leak flow detection according to one embodiment of the present disclosure;

FIG. 7 is a flow chart of a method of detecting a liquid leakage flow according to an embodiment of the disclosure.

Wherein the content of the first and second substances,

100 containers; 101 a water inlet; 102 water outlet; 103 an overflow; 104 a filter screen; 105 mounting a plate; 106 threaded holes; 107 a baffle; 108 a drip tray; 109 connecting holes; 110 a support block; 200 a liquid detection module; 201 detecting a probe; 202 probe guard rail; 203 an optical fiber interface; 204 scales; 210 a first liquid detection module; 220 a second liquid detection module; 300 a lifting mechanism; 301 bearings; a 302 screw; 303 locking the nut; 304 a locknut; 305 a groove; 400 dust cover.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways, without departing from the spirit or scope of the present disclosure. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present disclosure, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience of description and simplicity of description only, and do not indicate or imply that the referenced apparatus or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present disclosure. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present disclosure, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection: may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not directly, but via another feature in between. Also, a first feature "on," "above," and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under", "below" and "beneath" a second feature includes the first feature being directly above and diagonally above the second feature, or simply meaning that the first feature is less level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the disclosure. To simplify the disclosure of the present disclosure, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present disclosure. Moreover, the present disclosure may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

The exemplary embodiments of the present disclosure will be described below with reference to the accompanying drawings, and it should be understood that the exemplary embodiments described herein are merely for the purpose of illustrating and explaining the present disclosure and are not intended to limit the present disclosure.

As shown in fig. 1, 2, 3, and 4, an exemplary embodiment of the present disclosure provides a liquid leakage flow rate detection apparatus. The liquid leakage flow detection device is arranged at the bottom of the converter valve, and can send a corresponding signal if the liquid leakage flow of the converter valve reaches a leakage flow threshold value. The liquid leakage flow rate detecting apparatus includes a container 100, a liquid detecting module 200, and a lifting mechanism 300. The leaked liquid flows into the container 100, the liquid detection module 200 is mounted on the container 100 through the lifting mechanism 300, and if the liquid in the container rises to a position where the liquid detection module 200 can detect, it indicates that the leakage flow rate reaches the leakage flow rate threshold value.

The container 100 is used to contain leaked liquid and includes a water inlet 101 and a water outlet 102. In this embodiment, the container 100 is approximately square (or may have other shapes) and has a cavity inside. Liquid leaking from the converter valves is collected in the water inlet 101 and enters the vessel 100 through the water inlet 101. The liquid in the container 100 flows out of the water outlet 102.

Optionally, the container 100 is provided with a water inlet 101 on each of four side walls, the water inlet 101 being located at the top of the container, and the water outlet 102 being located at the bottom center of the container. In this embodiment, the number of the water outlets 102 is one, and a plurality of water outlets 102 may be provided according to the requirement.

As shown in fig. 6, the opening area (cross-sectional area) of the water outlet is a, the flow coefficient of the water outlet is μ (ratio of actual flow to ideal flow), the height of the liquid surface of the container is H, and the flow Q of the liquid discharged through the water outlet is then_outComprises the following steps:

from the above formula, it can be derived that only the inflow Q is_inGreater than the water outlet flow Q_outIn this case, the liquid level rises. The higher the liquid level H is, the higher the water outlet flow Q_outThe larger. When the water inlet flow rate Q_inEqual to the water flowQuantity Q_outThe liquid level will be stable and constant. Therefore, the leakage flow rate Q can be judged by the liquid level H reached by the leakage liquid in the container_in。

The size of the opening area A of the water outlet can be properly designed according to the requirement, for example, the opening area A can be designed to be 2-10 mm². In this embodiment, the size of the opening area A of the water outlet is 7mm². The water outlet flow coefficient mu can be calculated according to an empirical formula, and can also be obtained by using actual test data of a real object with the water outlet. In this embodiment, the outlet flow coefficient μ is 0.6.

The container 100 also includes a drip tray 108, the drip tray 108 being adapted to collect leaked liquid and direct the leaked liquid into the water inlet 101. In this embodiment, the four corners of the side wall of the container 100 are provided with support blocks 110, and the water pan 108 is installed outside the side wall of the container 100 through the support blocks 110. The leaked liquid is collected by the pan surface of the drip pan 108 and flows into the water inlet 101. The drip tray 108 is provided with a plurality of connection holes 109, and the container 100 is installed at the bottom of the valve tower of the converter valve through the connection holes 109.

As shown in fig. 4, the liquid detection module 200 includes a detection probe 201. The detection probe 201 is located in the container 100, and if the liquid in the container 100 contacts the detection probe 201, the detection probe 201 generates a signal and the liquid detection module transmits the signal.

The liquid in the container 100 contacts the detection probe 201, indicating that the liquid level H reaches the height of the detection probe 201 relative to the bottom of the container 100. At this time, the leakage flow rate is greater than or equal to the threshold leakage flow rate corresponding to the height of the detection probe 201 relative to the bottom of the container 100. When the leakage flow reaches the leakage flow threshold value, a controller (not shown in the figure) can send out an alarm after receiving the signal transmitted by the liquid detection module.

Optionally, the detection probe 201 is located at the bottom of the liquid detection module 200, and a probe guard 202 is provided on the periphery of the detection probe 201, that is, the detection probe 201 is located in a space surrounded by the probe guard 202. Set up like this, let liquid can smoothly contact with test probe 201 on the one hand, on the other hand avoids probably to test probe 201's collision among production, the debugging process.

In this embodiment, the detecting probe 201 may be a total reflection glass prism. When the prism is not in contact with liquid, the optical signal is subjected to a total reflection phenomenon in the prism and passes through the prism. When the prism is in contact with the liquid, most of the optical signal will be refracted into the liquid and the optical signal will be interrupted. The liquid detection module 200 is connected to a controller through an optical fiber interface 203, and the controller determines whether the leakage flow rate reaches a leakage flow rate threshold value based on the presence or absence of the optical signal.

The lifting mechanism 300 is used to mount the liquid detection module 200 on the container 100. The height of the detection probe 210 relative to the bottom of the container 100 can be adjusted by adjusting the lifting mechanism 300, so as to adjust the corresponding leakage flow threshold of the liquid detection module 200.

The liquid leakage flow rate detection device of the embodiment adjusts the height of the detection probe 210 relative to the bottom of the container 100 through the lifting mechanism 300, and can flexibly and conveniently adjust the size of the liquid leakage flow rate threshold; the applicability of the product is greatly improved, the production and field debugging efficiency is improved, the technical level requirements of installation and debugging personnel are reduced, and the maintenance convenience is improved.

According to an alternative aspect of the present disclosure, the container 100 further comprises an overflow gap 103, the overflow gap 103 being located below the water inlet 101. When the leakage flow is large and the water outlet 102 cannot discharge the liquid in the container 100 in time, the excessive liquid in the container 100 is discharged through the overflow port 103, so that the damage of the equipment can be avoided.

According to an optional technical scheme of the present disclosure, a filter screen 104 is disposed at the water inlet 101. The filter screen 104 can filter large-particle impurities in the leaked liquid, so that the impurities are prevented from entering the container 100, the water outlet 102 is prevented from being blocked, and the operation of the equipment is prevented from being influenced.

In this embodiment, the vessel 100 further comprises a baffle 107. The lower end of the guide plate 107 is inclined, and the guide plate 107 is arranged at the water inlet 101. The liquid filtered by the screen 104 flows along the flow guide plate 107 into the interior of the container 100.

According to an alternative aspect of the present disclosure, the container 100 includes a mounting plate 105 at the top end. The mounting plate 105 is fixed to the top end of the container 100 by screws, covering the top end opening of the container 100. The mounting plate 105 is provided with a threaded hole 106, and the elevating mechanism 300 is connected to the mounting plate 105 through the threaded hole 106.

Optionally, the lifting mechanism 300 includes a bearing 301, a threaded screw 302, and a locking nut 303. The side wall of the liquid detection module 200 extends out of the bearing block, and the bearing 301 is installed on the bearing block of the side wall of the liquid detection module 200. One end of the screw 302 passes through the inner hole of the bearing 301 along the vertical direction, and the screw 302 is in interference fit with the bearing 301. The other end of the screw 302 is in threaded connection with the threaded hole 106 of the mounting plate. The height of the liquid detection module 200, i.e., the height of the detection probe 210 relative to the bottom of the container 100, can be adjusted by rotating the screw 302, thereby adjusting the leak flow threshold. In this embodiment, the two opposite sidewalls of the liquid detecting module 200 are provided with the lifting mechanism 300.

The locking nut 303 is positioned on the screw 302, and after the screw 302 is adjusted in place, the locking nut 303 is screwed down, so that the locking nut 303 contacts the mounting plate 105 to lock the screw 302, and the screw 302 cannot rotate. Optionally, the screw 302 is further provided with a locknut 304, and the locknut 304 abuts against the locknut 303, so that the locknut 303 is prevented from being loosened in operation, and further the height of the liquid detection module 200 is changed, and the product accuracy is affected. The top of the screw 302 is provided with a groove 305 for facilitating the rotation of the screw 302.

According to an optional aspect of the present disclosure, a scale 204 is marked on a sidewall of the liquid detection module 200. If the liquid leakage flow detection device is produced in batch, the scales 204 can help a debugging person to quickly adjust the liquid detection module 200 to a preset height, so that the production efficiency is improved. The scale 204 may be disposed on the sidewall of the container 100, or on both the sidewall of the container 100 and the sidewall of the liquid detection module 200, so that the debugging personnel can conveniently debug the container.

According to an optional technical scheme of the present disclosure, the number of the liquid detection modules 200 is multiple, and the height of the detection probe 201 of each liquid detection module relative to the bottom of the container 100 is a corresponding preset value. The height of the detection probe 201 relative to the bottom of the container 100 may be different for different liquid detection modules in order to generate a multi-level signal. In this embodiment, the liquid detection module 200 includes a first liquid detection module 210 and a second liquid detection module 220.

The first liquid detection module 210 has a greater vertical height relative to the second liquid detection module 220, and the first liquid detection module 210 can enter deeper into the container 100. The sensing probe 1 of the first liquid sensing module 210 is positioned lower than the sensing probe 2 of the second liquid sensing module 220. Once the liquid level in the container 100 rises, the sensing probe 1 is triggered first. The signal of the detection probe 1 can be used as an alarm signal for the slight level of leakage. If the liquid level continues to rise and reaches the height of the detection probe 2, the detection probe 2 is triggered to send out a signal. The signal of the detection probe 2 can be used as an alarm signal for the severity level of the leak. If the liquid level is still rising, the liquid is discharged through the overflow port 103.

As shown in fig. 5, according to an alternative embodiment of the present disclosure, the fluid leakage flow rate detection apparatus further includes a dust cover 400. The dust cover 400 has a cavity therein, and the top of the liquid detection module 200 is located in the cavity of the dust cover 400. The dust cap 400 is coupled to the container 100 to prevent other liquids or dust from entering the body leakage flow rate sensing device.

As shown in fig. 7, an embodiment of the present disclosure also provides a method for detecting a liquid leakage flow rate by the liquid leakage flow rate detection apparatus described above. The method comprises the following steps:

leaked liquid is introduced into the container through the water inlet 101, and flows out of the container through the water outlet 102, so that the leakage flow rate is increased, and the liquid level in the container is increased.

The opening area (cross-sectional area) of the water outlet 102 is A, the flow coefficient of the water outlet is mu (ratio of actual flow to ideal flow), the liquid level height of the current container is H, and the flow Q of the liquid discharged from the water outlet at the moment_outComprises the following steps:

from the above formula, it can be derived that only the inflow Q is_inGreater than the water outlet flow Q_outIn this case, the liquid level rises. The higher the liquid level H is, the higher the water outlet flow Q_outThe larger.When the water inlet flow rate Q_inEqual to the water outlet flow Q_outThe liquid level will be stable and constant. Therefore, the leakage flow rate Q can be judged by the liquid level H reached by the leakage liquid in the container_in。

If leakage flow rate Q_inWhen the leakage flow rate threshold Q is reached, the liquid in the container 100 contacts the detection probe of the liquid detection module, and the detection probe generates a signal and the liquid detection module transmits the signal.

In this embodiment, the height h of the detection probe 201 relative to the bottom of the container, the opening area a of the water outlet 102, and the leakage flow threshold Q satisfy the following relation:wherein g is the gravity acceleration and mu is the water outlet flow coefficient.

When the liquid level height H is equal to H,the liquid in the container 100 contacts the detection probe 201 and generates a signal.

As shown in fig. 6, it is exemplified that the liquid leakage flow rate detection apparatus of the present disclosure includes a first liquid detection module 210 and a second liquid detection module 220. The height of the sensing probe 1 of the first liquid sensing module 210 with respect to the bottom of the container 100 is h₁The second liquid detection module 220 detects the height h of the probe 2 relative to the bottom of the container 100₂。

When the leaked liquid begins to accumulate in the container, the bottom water outlet 102 cannot discharge the liquid in the container in time, and the liquid level begins to rise. The liquid level reaches H₁＝h₁That is, the liquid level reaches the height of the detection probe 1, there must be:since the leakage flow reaches the leakage flow threshold corresponding to the detection probe 1, the detection probe 1 will prompt the controller to generate a slight leakage alarm signal.

If the leakage flow is large enough, the liquid level rises to H₂＝h₂Then, there must be:if the leakage flow exceeds the leakage flow threshold corresponding to the detection probe 2, the detection probe 2 will prompt the controller to generate a serious leakage alarm signal.

If the leak flow rate threshold Q needs to be adjusted, the height of the detection probe 210 relative to the bottom of the container 100 is adjusted to correspond to the adjusted leak flow rate threshold.

Different use environments have different leakage flow threshold settings when slight and serious leakage alarms. The height h of the inspection probe relative to the bottom of the container 100 can be adjusted by rotating the screw 302₁、h₂To adjust the corresponding leakage flow threshold.

In actual production, due to errors in the size of the water outlet 102 caused by machining, the height h of the originally set detection probe relative to the bottom of the container cannot accurately correspond to the required leakage flow threshold. At this point, calibration can be performed using a simulated leak test:

the liquid is supplied to the container 100 by the pump, the input flow rate is maintained at the leakage flow rate threshold Q, and after the liquid level in the container stops rising and stabilizes, the stable liquid level height is the height h of the detection probe corresponding to the leakage flow rate threshold Q with respect to the bottom of the container.

Optionally, if the liquid leakage flow rate detection apparatus includes a plurality of liquid detection modules, when the leakage flow rate is greater than a maximum leakage flow rate threshold value in the plurality of liquid detection modules, the excess liquid in the container is discharged from the overflow port.

An embodiment of the present disclosure also provides a converter valve, including a valve tower and a liquid leakage flow rate detection device as above, the liquid leakage flow rate detection device being located at the bottom of the valve tower.

The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of protection of the present disclosure.

Finally, it should be noted that: although the present disclosure has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.