Open channel flow monitoring equipment

Abstract

The utility model relates to the technical field of underground safety monitoring, and provides open channel flow monitoring equipment. The open channel flow monitoring equipment comprises a shell, a filtering assembly, a sinking resisting assembly and a monitoring assembly, the shell comprises a sand filtering flow channel and a monitoring flow channel, and the monitoring flow channel is arranged at the flow outlet end of the sand filtering flow channel; the filtering assembly is arranged at the incoming flow end of the sand filtering flow channel and is used for filtering the water-sand mixture; the sedimentation resisting assembly is arranged at the outflow end of the sand filtering flow channel and used for conducting sedimentation treatment on the water-sand mixture; the monitoring assembly is arranged in the monitoring flow channel and used for monitoring the flow of the water-sand mixture flowing out of the self-sinking-resisting assembly. According to the open channel flow monitoring equipment provided by the utility model, the concentration of solid particles in a water-sand mixture is effectively reduced through dual treatment of filtering and settling resistance, so that the measured value deviation of traditional monitoring equipment is greatly reduced, the accuracy of flow monitoring is improved, and the reliability of early warning of water inrush and sand inrush accidents is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of underground safety monitoring, especially relates to a open channel flow monitoring equipment. BACKGROUND

[0002] In some areas where coal seams are formed in later years, the stratum lithology has low consolidation degree, and part of sandstone layers have loose structure, which is easy to develop cracks under the influence of mining stress in the process of coal mining. When the working face advances to the bottom of the high water head pressure aquifer, the underground water carries the loose sand body to form a water-sand mixed flow through the mining cracks and quickly inrush into the goaf, which is easy to cause water inrush and sand inrush accidents.

[0003] At present, electromagnetic flowmeters, ultrasonic flowmeters and other devices are generally used for underground water inrush monitoring. However, there are a large number of solid particles in the water-sand mixed flow, and the density of the water-sand mixed flow is quite different from the medium density of the water flow itself, which leads to a large deviation between the measured value and the true water flow. The misjudgment of the water-sand mixed flow has a great influence on disaster warning, and further poses a certain threat to the safety of underground personnel and equipment. UTILITY MODEL CONTENTS

[0004] The utility model provides a open channel flow monitoring equipment to solve the defect that the water-sand mixed flow is misjudged in the prior art, through the double processing of filtering and blocking sinking, the concentration of solid particles in the water-sand mixture is effectively reduced, which greatly reduces the deviation of the measured value of the traditional monitoring equipment such as electromagnetic flowmeter or ultrasonic flowmeter, thereby improving the accuracy of flow monitoring, further improving the reliability of water inrush and sand inrush accident warning, and reducing the safety risk faced by underground personnel and equipment.

[0005] The open channel flow monitoring equipment provided by the utility model comprises:

[0006] The shell comprises:

[0007] The sand filtering flow channel;

[0008] The monitoring flow channel is arranged at the outflow end of the sand filtering flow channel;

[0009] The filtering assembly is arranged at the inflow end of the sand filtering flow channel, and the filtering assembly is used for filtering the water-sand mixture;

[0010] The sinking blocking assembly is arranged at the outflow end of the sand filtering flow channel, and the sinking blocking assembly is used for precipitating the water-sand mixture;

[0011] The monitoring assembly is arranged at the monitoring flow channel, and the monitoring assembly is used for monitoring the flow of the water-sand mixture flowing out of the sinking blocking assembly.

[0012] According to the open channel flow monitoring equipment provided by the utility model, the sinking blocking assembly comprises:

[0013] At least one first flow guide plate is arranged at the outflow end of the sand filtering flow channel, and the first flow guide plate and the bottom of the sand filtering flow channel are arranged at a first preset interval;

[0014] A second flow guide plate is arranged on the side of the first flow guide plate facing the outflow end of the sand filtering flow channel, and is arranged at a second preset interval with the first flow guide plate, and the height of the upper edge of the second flow guide plate is less than the height of the upper edge of the first flow guide plate.

[0015] In the case where the number of the first flow guide plates is more than two, the first flow guide plates and the second flow guide plates are alternately and interval arranged.

[0016] According to the open channel flow monitoring equipment provided by the utility model, the first preset interval is a, wherein the value range of a is: 1cm≤a≤3cm.

[0017] According to the open channel flow monitoring equipment provided by the utility model, the second preset interval is b, wherein the value range of b is: 0.5m≤b≤1m.

[0018] According to the open channel flow monitoring equipment provided by the utility model, the height of the shell is h, and the height of the second flow guide plate ranges from 0.6h to 0.8h.

[0019] According to the open channel flow monitoring equipment provided by the utility model, the filter assembly comprises at least one filter plate, the filter plate is arranged at the inflow end of the sand filtering flow channel, and a plurality of filter holes or filter grooves are arranged on the filter plate.

[0020] According to the open channel flow monitoring equipment provided by the utility model, the diameter of the filter hole is e, wherein the value range of e is: 1.5cm≤e≤2.5cm;

[0021] Alternatively, the width of the filter groove is f, wherein the value range of f is: 1.5cm≤f≤2.5cm.

[0022] According to the open channel flow monitoring equipment provided by the utility model, the monitoring flow channel comprises a Parshall trough, and the Parshall trough comprises:

[0023] ‌a contraction section connected to the outflow end of the sand filtering flow channel, the contraction section gradually contracts along the inflow direction;

[0024] a throat section connected to the contraction section, and the monitoring assembly is arranged in the throat section;

[0025] ‌a diffusion section connected to the throat section, and the diffusion section gradually expands along the inflow direction.

[0026] The open channel flow monitoring equipment provided by the utility model, the monitoring assembly comprises a pressure sensor, the pressure sensor is arranged in the throat section, and the pressure sensor is used for monitoring the pressure of the water flow after the water-sand mixture is filtered, so as to monitor the flow of the water flow after the water-sand mixture is filtered.

[0027] The open channel flow monitoring equipment provided by the utility model, the bottom of the sand filtering flow channel is provided with a sewage outlet, and the sewage outlet is used for cleaning the sediment.

[0028] In the open channel flow monitoring equipment provided by the utility model, the filter assembly and the sedimentation prevention assembly are cooperatively arranged, the filter assembly is used for preliminarily filtering the water-sand mixture at the inflow end of the sand filtering flow channel, the loose sand particles with a large particle size are intercepted, then the sedimentation prevention assembly is used for performing sedimentation treatment on the water-sand mixture at the outflow end of the sand filtering flow channel, and the fine sand particles that are not filtered are further settled under the action of the sedimentation prevention, so that the content of solid particles in the fluid that finally enters the monitoring flow channel is effectively reduced, and therefore the monitoring assembly can perform flow measurement on the fluid after the interference of the solid particles is reduced.

[0029] Compared with the prior art that directly monitors the water-sand mixed fluid, in the open channel flow monitoring equipment provided by the utility model, the concentration of the solid particles in the water-sand mixture is effectively reduced through the double treatment of filtering and sedimentation prevention, the fluid density that flows through the monitoring assembly is closer to the medium density of the water flow itself, which greatly reduces the measurement deviation of the traditional monitoring equipment such as the electromagnetic flowmeter or the ultrasonic flowmeter, thereby improving the accuracy of flow monitoring, further improving the reliability of the water inrush and sand collapse accident early warning, and reducing the safety risk of the downhole personnel and equipment.

[0030] Compared with the existing filter structure in the prior art open channel, in the open channel flow monitoring equipment provided by the utility model, the positional relationship between the filter assembly, the sedimentation prevention assembly and the monitoring assembly is fixed, and will not affect the monitoring effect of the monitoring assembly due to the change of the position of the open channel flow monitoring equipment in the open channel, that is, the filter assembly, the sedimentation prevention assembly and the monitoring assembly are integrated into an integral structure through the shell, so that the water-sand mixture monitored by the monitoring assembly is under the same filtering condition, and therefore when the transverse comparison is performed, the influence of the external environment on the monitoring result can be avoided, and the accuracy of the monitoring result can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical scheme of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0032] Figure 1 is an application schematic view of the open channel flow monitoring equipment under a top view angle provided by the embodiment of the present application.

[0033] Figure 2 is a sectional view of the open channel flow monitoring equipment under a side view angle provided by the present application.

[0034] Reference signs:

[0035] 100: shell; 110: sand filtering flow channel; 120: monitoring flow channel; 121: Parshall trough; 1211: contraction section; 1212: throat section; 1213: diffusion section; 200: filtering assembly; 210: filtering plate; 300: sedimentation prevention assembly; 310: first flow guide plate; 320: second flow guide plate; 400: monitoring assembly; 410: pressure sensor. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the ordinary skilled in the art without making creative efforts are within the protection scope of the present application.

[0037] In the description of the embodiments of the present application, it should be noted that unless explicitly defined and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium. For the ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] In the embodiments of the present application, unless explicitly defined and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0039] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0040] Figure 1 is an application schematic diagram of the open channel flow monitoring equipment in the present embodiment of the present application under a top view angle; Figure 2 is a sectional view of the open channel flow monitoring equipment in the present embodiment of the present application under a side view angle.

[0041] Referring to Figure 1 and Figure 2 , the present embodiment of the present application provides an open channel flow monitoring equipment, which comprises a shell 100, a filtering assembly 200, a sinking resisting assembly 300 and a monitoring assembly 400. The shell 100 is hollow inside and is provided with openings at both ends to form a flow channel for water and sand mixture to flow through. The flow channel comprises a sand filtering flow channel 110 and a monitoring flow channel 120, and the monitoring flow channel 120 is arranged at the outflow end of the sand filtering flow channel 110. The shell 100 of the sand filtering flow channel 110 and the shell 100 of the monitoring flow channel 120 can be independent parts which are assembled together when in use. Alternatively, they can be integrated parts, for example, the shell 100 with the sand filtering flow channel 110 and the monitoring flow channel 120 is made by integral processing.

[0042] The filtering assembly 200 is arranged at the inflow end of the sand filtering flow channel 110 and is used for filtering the water and sand mixture. The sinking resisting assembly 300 is arranged at the outflow end of the sand filtering flow channel 110 and is used for precipitating the water and sand mixture. It should be noted that, for the convenience of explanation, the flow direction of the water and sand mixture, i.e. the "inflow direction", is taken as a reference to explain each part. The "inflow end" refers to one end of a part through which the water and sand mixture enters, and the "outflow end" refers to one end of a part through which the water and sand mixture exits. In other words, the "inflow end" is equivalent to the inlet end of a part, and the "outflow end" is equivalent to the outlet end of a part.

[0043] The monitoring assembly 400 is arranged in the monitoring flow channel 120, and the monitoring assembly 400 is used for monitoring the flow of the water-sand mixture flowing out of the blocking and sinking assembly 300, and the monitoring assembly 400 can be specifically selected from components such as an electromagnetic flowmeter and an ultrasonic flowmeter.

[0044] It can be understood that in the open channel flow monitoring device provided in the embodiment of the utility model, the filter assembly 200 and the blocking and sinking assembly 300 are arranged in a cooperative structure, the water-sand mixture is preliminarily filtered by the filter assembly 200 at the inflow end of the sand filtering flow channel 110, and the loose sand bodies with large particles are intercepted, then the water-sand mixture is subjected to sedimentation treatment by the blocking and sinking assembly 300 at the outflow end of the sand filtering flow channel 110, so that the fine sand particles that are not filtered further settle under the blocking and sinking action, and thus the solid particle content in the fluid finally entering the monitoring flow channel 120 can be effectively reduced, so that the monitoring assembly 400 can measure the flow of the fluid with reduced solid particle interference.

[0045] Compared with the scheme in the prior art that directly monitors the water-sand mixed fluid, in the open channel flow monitoring device provided in the embodiment of the utility model, the concentration of the solid particles in the water-sand mixture is effectively reduced by the double processing of filtering and blocking and sinking, and the fluid flowing through the monitoring assembly 400 has a density closer to the medium density of the water flow itself, which greatly reduces the measurement value deviation of the traditional monitoring device such as the electromagnetic flowmeter or the ultrasonic flowmeter, thereby improving the accuracy of flow monitoring, further improving the reliability of the water and sand inrush accident early warning, and reducing the safety risk of the downhole personnel and equipment.

[0046] Compared with the existing filter structure in the existing open channel, in the open channel flow monitoring device provided in the embodiment of the utility model, the positional relationship between the filter assembly 200, the blocking and sinking assembly 300 and the monitoring assembly 400 is fixed, and will not affect the monitoring effect of the monitoring assembly 400 due to the change of the position of the open channel flow monitoring device in the open channel, that is, the filter assembly 200, the blocking and sinking assembly 300 and the monitoring assembly 400 are integrated into an integral structure by the shell 100, so that the water-sand mixture monitored by the monitoring assembly 400 is all under the same filtering condition, and thus when the lateral comparison is performed, the influence of the external environment on the monitoring result can be avoided, and the accuracy of the monitoring result can be ensured.

[0047] Continuously referring to Figure 2 In the optional embodiment of the utility model, the blocking and sinking assembly 300 comprises a first flow guide plate 310 and a second flow guide plate 320, the first flow guide plate 310 can be provided with one or two or more than two, and the number of the second flow guide plate 320 is the same as that of the first flow guide plate 310; the first flow guide plate 310 is arranged at the outflow end of the sand filtering flow channel 110, and the first flow guide plate 310 and the bottom of the sand filtering flow channel 110 are arranged at a first preset interval, so as to form a first flow bypass.

[0048] The second flow guide plate 320 is arranged on the side of the first flow guide plate 310 facing the outflow end of the sand filtering flow channel 110 and is arranged at a second preset interval with the first flow guide plate 310; the height of the upper edge of the second flow guide plate 320 is less than the height of the upper edge of the first flow guide plate 310, so as to form a second flow bypass; it should be noted that the height of the upper edge of the second flow guide plate 320 is less than the height of the upper edge of the first flow guide plate 310, so as to avoid the problem of backflow of the water-sand mixture at the upper edge of the first flow guide plate 310.

[0049] In the case where the number of the first flow guide plates 310 is more than two, the first flow guide plates 310 and the second flow guide plates 320 are alternately and intervally arranged, and the interval between any adjacent first flow guide plate 310 and second flow guide plate 320 is arranged at the second preset interval.

[0050] Referring to Figure 2 It can be understood that, in the open channel flow monitoring device provided by the embodiment of the present application, the first flow bypass is formed by the first preset interval between the first flow guide plate 310 and the bottom of the sand filtering flow channel 110, so as to force the water-sand mixture to flow downward to generate flow bypass, reduce the flow rate and promote the larger sand particles to settle at the bottom of the flow channel due to the gravity in the flow bypass process; further, the second flow bypass formed by the second flow guide plate 320 arranged at a height lower than the upper edge of the first flow guide plate 310 can limit the upward flow of the water-sand mixture after passing through the first flow bypass, slow down the upward speed of the water-sand mixture and prolong the residence time of the sand particles in the flow channel, so as to enhance the sedimentation effect of the fine sand particles.

[0051] In the case where a plurality of first flow guide plates 310 and a plurality of second flow guide plates 320 are arranged, the plurality of first flow guide plates 310 and the plurality of second flow guide plates 320 are alternately and intervally arranged, so as to form a plurality of flow bypass paths, and further make the fluid repeatedly change the flow direction and flow rate in the alternating upward and downward flow bypass process, so as to promote the sand particles of different particle sizes to settle in stages, thereby effectively improving the sedimentation treatment effect of the water-sand mixture in the limited flow channel space, providing the subsequent monitoring assembly 400 with the to-be-measured fluid having a lower solid particle content and a more stable flow state, and further reducing the flow measurement error.

[0052] Referring to Figure 2It can be understood that, in the optional embodiment of the utility model, the first preset interval is a, wherein the value range of a is 1cm to 3cm, that is, a can take the value of 1cm, 1.5cm, 2cm, 2.5cm or 3cm; it can be understood that, by limiting the first preset interval within the above value range, the risk of flow channel blockage caused by too small interval is avoided, and the blocking effect of eddy current on sand particles caused by too large interval is prevented, so that a better balance between fluid flux and sand particle settling efficiency can be formed, and a foundation for subsequent stable measurement of fluid in the flow channel 120 can be laid.

[0053] Referring to Figure 2 It can be understood that, in the optional embodiment of the utility model, the second preset interval is b, wherein the value range of b is 0.5m to 1m, that is, b can take the value of 0.5m, 0.7m, 0.9m or 1m; it can be understood that, by limiting the second preset interval within the above value range, the horizontal distance between the second eddy current port and the first eddy current port can be adapted to the flow characteristics of the high flow rate water-sand mixture underground, providing sufficient expansion space for the water-sand mixture after passing through the first eddy current port to reduce the flow rate, and promoting the sand particles to accelerate settling in the horizontal flow section due to kinetic energy attenuation.

[0054] Referring to Figure 2 It can be understood that, in the optional embodiment of the utility model, the height of the shell 100 is h, and the height of the second flow guide plate 320 is in the range of 0.6h~0.8h, that is, the height of the second flow guide plate 320 can be 0.6h, 0.7h or 0.8h; it can be understood that, by limiting the height of the second flow guide plate 320 to 0.6 times to 0.8 times of the height of the shell 100, the overall structure of the shell 100 is proportionally constrained, which can increase the contact probability of sand particles with the bottom of the flow channel under the premise of ensuring that the second flow guide plate 320 effectively blocks the direct overtop flow of fluid.

[0055] At the same time, the height proportion is adapted to the alternating layout of the first flow guide plate 310 and the second flow guide plate 320, which can make the fluid maintain smooth transition of flow direction when the flow direction is alternately converted up and down, and can avoid the secondary suspension of sand particles caused by excessive attenuation of fluid kinetic energy due to the second flow guide plate 320 being too high, or shorten the sand particle settling time caused by fluid overflowing too early due to insufficient height. In addition, the combination of the second preset interval and the height limitation of the second flow guide plate 320 can guide the fluid to form a smooth flow transition in the alternating eddy current path up and down, avoiding the re-suspension of settled sand particles caused by the intensification of fluid turbulence.

[0056] In the optional embodiment of the utility model, the filtering assembly 200 includes at least one filter plate 210, the filter plate 210 is arranged at the inflow end of the sand filtering flow channel 110, a plurality of filter holes or filter grooves are arranged on the filter plate 210, the diameter of the filter hole is e, wherein the value range of e is 1.5cm to 2.5cm; or the width of the filter groove is f, wherein the value range of f is 1.5cm to 2.5cm, that is, e or f can take the value of 1.5cm, 1.7cm, 2cm or 2.5m.

[0057] It can be understood that, in the open channel flow monitoring equipment provided by the utility model embodiment, the diameter of the filter hole or the width of the filter groove of the filter plate 210 is limited to 1.5cm to 2.5cm, which is adapted to the distribution characteristics of the large particle size particles in the coal seam loose sand body, and the size of the filter hole or the filter groove at the inflow end of the sand filtering flow channel 110 can be used for size screening, so that the sand particles with a diameter or width greater than the set value can be intercepted, the large particle sand body is prevented from entering the subsequent flow channel to cause the blocking of the sinking blocking assembly 300 or the abrasion of the monitoring assembly 400, and meanwhile, under the premise of ensuring the filtering efficiency, the smaller particle size sand particles and the water flow can smoothly pass through, the continuity of the fluid flow can be maintained, and the water sand mixture is prevented from accumulating at the filter plate 210 to increase the flow channel pressure due to the too small filter hole or filter groove.

[0058] Referring to Figure 1 and Figure 2 It can be understood that, in the optional embodiment of the utility model, the monitoring flow channel 120 includes the Parshall trough 121, the Parshall trough 121 includes the contraction section 1211, the throat section 1212 and the diffusion section 1213, the contraction section 1211 is connected to the outflow end of the sand filtering flow channel 110, and the contraction section 1211 gradually contracts along the flow direction; the throat section 1212 is connected to the contraction section 1211, and the monitoring assembly 400 is arranged at the throat section 1212; the diffusion section 1213 is connected to the throat section 1212, and the contraction section 1211 gradually expands along the flow direction.

[0059] It can be understood that, in the open channel flow monitoring equipment provided by the utility model embodiment, the monitoring flow channel 120 is arranged as the Parshall trough 121 structure including the contraction section 1211, the throat section 1212 and the diffusion section 1213, the flow channel cross section of the contraction section 1211 gradually contracts along the flow direction at the outflow end of the sand filtering flow channel 110, so that the fluid is guided to accelerate, the low sand content fluid subjected to the sinking treatment forms a stable critical flow state at the throat section 1212, and the fixed relationship between the liquid level height and the flow rate measured by the monitoring assembly 400 at the throat section 1212 can realize the flow rate calculation, this mode is simple and direct, based on the existing Parshall trough 121 structure, without the need of additionally designing the corresponding flow rate calculation template for the open channel flow monitoring equipment, the production manufacturing cost and the design difficulty of the open channel flow monitoring equipment can be effectively reduced.

[0060] In addition, the design of the gradually expanding diffusion section 1213 along the incoming flow direction can avoid the interference of downstream water level fluctuation on the flow state of the throat section 1212 by slowing down the fluid flow rate and restoring the fluid pressure, thereby ensuring the stability of the flow monitoring.

[0061] In the optional embodiment of the utility model, the monitoring assembly 400 comprises a pressure sensor 410, the pressure sensor 410 is arranged at the throat section 1212, and the pressure sensor 410 is used for monitoring the pressure of the water-sand mixture so as to monitor the flow rate of the water flow after the water-sand mixture is filtered. It can be understood that in the open channel flow monitoring device provided by the embodiment of the utility model, the pressure of the water-sand mixture is monitored by arranging the pressure sensor 410 at the throat section 1212 of the Parshall trough 121, the corresponding relationship between the fluid pressure and the fluid level height under the critical flow state of the throat section 1212 can be utilized to obtain the fluid level height, and then based on the stable corresponding relationship between the fluid level height and the flow rate, the pressure signal can be directly converted into flow rate data.

[0062] Compared with the electromagnetic or ultrasonic flow meter directly used in the high sand-containing fluid in the prior art, the scheme is adapted to the flow state characteristics of the Parshall trough 121 of the low sand-containing fluid and the pressure sensing principle, the solid particles are eliminated from the physical interference of the sensor, the pressure-flow conversion relationship is solidified by utilizing the fluid mechanics characteristics, the anti-interference performance and the long-term stability of the flow monitoring can be improved in the complex downhole environment, and reliable data basis is provided for the water inrush and sand collapse early warning.

[0063] In the optional embodiment of the utility model, the bottom of the sand filtering flow channel 110 is provided with a blowdown port, and the blowdown port is used for cleaning the sediment. It can be understood that in the open channel flow monitoring device provided by the embodiment of the utility model, the sedimented sand particles in the settling and accumulation assembly 300 can be concentratedly discharged through the bottom blowdown port by arranging the blowdown port at the bottom of the sand filtering flow channel 110, the sedimented sand body can be cleaned regularly during the maintenance process of the open channel flow monitoring device, the stable flow rate distribution and sand particle sedimentation path of the water-sand mixture in the sand filtering flow channel 110 can be ensured, and the blowdown port can effectively reduce the blowdown difficulty and provide convenience for the blowdown operation.

[0064] It should be noted that the technical solutions in the various embodiments of the utility model can be combined with each other, but the combination of the technical solutions is based on the fact that the combination of the technical solutions can be realized by the ordinary skill in the art; when the combination of the technical solutions is contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, that is, it is not within the protection scope of the utility model.

[0065] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not limited to; although the present application is described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still be modified to the technical solutions recorded in the foregoing examples, or part of the technical features are replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An open channel flow monitoring device, characterized by, The application relates to a sand filter device. The device comprises: a housing (100), which comprises: a sand filtering flow channel (110); a monitoring flow channel (120) arranged at the outflow end of the sand filtering flow channel (110); a filtering assembly (200) arranged at the inflow end of the sand filtering flow channel (110), which is used for filtering treatment of a water-sand mixture; a sinking prevention assembly (300) arranged at the outflow end of the sand filtering flow channel (110), which is used for precipitation treatment of the water-sand mixture; 2. The open channel flow monitoring device of claim 1, wherein, a monitoring assembly (400) arranged at the monitoring flow channel (120), which is used for monitoring the flow of the water-sand mixture flowing out of the sinking prevention assembly (300). The sinking prevention assembly (300) comprises: at least one first flow guide plate (310) arranged at the outflow end of the sand filtering flow channel (110), and the first flow guide plate (310) is arranged at a first preset interval with the bottom of the sand filtering flow channel (110); a second flow guide plate (320) arranged at the side of the first flow guide plate (310) facing the outflow end of the sand filtering flow channel (110), and the second flow guide plate (320) is arranged at a second preset interval with the first flow guide plate (310), and the height of the upper edge of the second flow guide plate (320) is less than that of the first flow guide plate (310).

3. The open channel flow monitoring device of claim 2, wherein, In the case that the number of the first flow guide plates (310) is more than two, the first flow guide plates (310) and the second flow guide plates (320) are alternately and interval arranged.

4. The open channel flow monitoring device of claim 2, wherein, The first preset interval is a, and the value range of a is 1cm<=a<=3cm.

5. The open channel flow monitoring device of claim 2, wherein, The second preset interval is b, and the value range of b is 0.5m<=b<=1m.

6. The open channel flow monitoring device of any one of claims 1 to 5, wherein, The height of the housing (100) is h, and the height of the second flow guide plate (320) ranges from 0.6h to 0.8h.

7. The open channel flow monitoring device of claim 6, wherein, The filtering assembly (200) comprises at least one filter plate (210) arranged at the inflow end of the sand filtering flow channel (110), and the filter plate (210) is provided with a plurality of filter holes or filter grooves. The diameter of the filter hole is e, and the value range of e is 1.5cm<=e<=2.5cm.

8. The open channel flow monitoring device of any one of claims 1 to 5, wherein, Alternatively, the width of the filter groove is f, and the value range of f is 1.5cm<=f<=2.5cm. The monitoring flow channel (120) comprises a Parshall trough (121), and the Parshall trough (121) comprises: a contraction section (1211) connected to the outflow end of the sand filtering flow channel (110), which gradually contracts along the inflow direction; a throat section (1212) connected to the contraction section (1211), and the monitoring assembly (400) is arranged at the throat section (1212); a diffusion section (1213) connected to the throat section (1212), which gradually expands along the inflow direction.

9. The open channel flow monitoring device of claim 8, wherein, The monitoring assembly (400) comprises a pressure sensor (410) arranged in the throat section (1212), the pressure sensor (410) being configured to monitor the pressure of the filtered water-sand mixture flow, so as to monitor the flow of the filtered water-sand mixture flow.

10. The open channel flow monitoring device of any one of claims 1 to 5, wherein, The bottom of the sand filtering channel (110) is provided with a sewage outlet, and the sewage outlet is used for cleaning the sediment.

Images