Flow detection device and flow detection method

Abstract

The application provides a flow detection device and a flow detection method. The flow detection device comprises a pipeline, a first transducer, a second transducer and a flow rate adjusting mechanism. The first transducer and the second transducer are arranged at intervals in the pipeline and are in communication with the lumen of the pipeline. The flow rate adjusting mechanism is located in the lumen between the first transducer and the second transducer. In the case that the flow rate adjusting mechanism is in a first state, the flow area of the flow rate adjusting mechanism is a first area. In the case that the flow rate adjusting mechanism is in a second state, the flow area of the flow rate adjusting mechanism is a second area, and the second area is greater than the first area. In the flow detection device, the flow rate adjusting mechanism between the first transducer and the second transducer can adjust the flow area of the channel between the first transducer and the second transducer, so as to avoid that the flow rate of the fluid between the first transducer and the second transducer is too large or too small, thereby being beneficial to improving the flow detection precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water metering, and in particular to a flow detection device and a flow detection method. BACKGROUND

[0002] A flow meter is a device for measuring the flow of a liquid. Existing flow meters are mostly mechanical, and have the disadvantages of short service life, low precision, and easy clogging.

[0003] An ultrasonic water meter measures flow by using the difference in propagation time of ultrasonic waves in forward flow and reverse flow. It has the advantages of non-contact, low pressure loss, low power consumption, and long service life.

[0004] However, in actual production operations, the form of fluid in the pipeline varies, which leads to unstable measurement accuracy of the ultrasonic water meter. SUMMARY

[0005] The present application provides a flow detection device and a flow detection method to solve the problem of unstable measurement accuracy of the ultrasonic water meter in the prior art.

[0006] In one aspect, the present application provides a flow detection device, comprising a pipeline, a first transducer, a second transducer, and a flow rate adjusting mechanism. The first transducer and the second transducer are arranged at intervals in the pipeline and are in communication with the lumen of the pipeline. The flow rate adjusting mechanism is located in the lumen of the pipeline between the first transducer and the second transducer. The flow rate adjusting mechanism is configured to switch between a first state and a second state. In the case where the flow rate adjusting mechanism is in the first state, the flow area of the flow rate adjusting mechanism is a first area. In the case where the flow rate adjusting mechanism is in the second state, the flow area of the flow rate adjusting mechanism is a second area, and the second area is greater than the first area.

[0007] In some further optional technical solutions, the flow rate adjusting mechanism comprises a first adjusting member and a second adjusting member. The first adjusting member comprises a first flow rate adjusting part, and the second adjusting member comprises a second flow rate adjusting part. The first adjusting member is configured to move relative to the second adjusting member between a first position and a second position. In the case where the first adjusting member is located at the first position relative to the second adjusting member, the overlapping area of the projections of the first flow rate adjusting part and the second flow rate adjusting part in the flow direction of the pipeline is a third area. In the case where the first adjusting member is located at the second position relative to the second adjusting member, the overlapping area of the projections of the first flow rate adjusting part and the second flow rate adjusting part in the flow direction of the pipeline is a fourth area, and the fourth area is greater than the third area.

[0008] In some further optional technical solutions, the second adjusting member further comprises a barrel part connected with the second flow rate adjusting part, an outer diameter of the barrel part is smaller than an inner diameter of the pipeline, and a flow rate adjusting channel is formed between an outer peripheral wall of the barrel part and an inner side wall of the pipeline, at least part of the second flow rate adjusting part protrudes from the outer peripheral wall of the barrel part, and the first flow rate adjusting part is located in the flow rate adjusting channel.

[0009] In some further optional technical solutions, the first adjusting member is sleeved on the barrel part and rotationally matched with the barrel part.

[0010] In some further optional technical solutions, the first adjusting member further comprises a main body part, the main body part is connected with the first flow rate adjusting part to form an annular structure.

[0011] In some further optional technical solutions, the first adjusting member comprises a plurality of first flow rate adjusting parts, the second adjusting member comprises a plurality of second flow rate adjusting parts, the first flow rate adjusting parts and the second flow rate adjusting parts are spaced apart along an outer peripheral direction of the barrel part, and one first flow rate adjusting part corresponds to one second flow rate adjusting part.

[0012] In some further optional technical solutions, a gap between two adjacent first flow rate adjusting parts corresponds to a first central angle, and a central angle corresponding to the second flow rate adjusting part is a second central angle, the second central angle is greater than or equal to the first central angle.

[0013] In some further optional technical solutions, the flow rate adjusting mechanism further comprises a driving assembly, the driving assembly is connected with and drives one of the first adjusting member and the second adjusting member to rotate relative to the other between the first position and the second position.

[0014] In some further optional technical solutions, the driving assembly comprises a driving member, a gear and a rack, the rack is arranged on the first adjusting member or the second adjusting member, the gear is engaged with the rack, the driving member is connected with the gear, and the driving member drives one of the first adjusting member and the second adjusting member to rotate relative to the other between the first position and the second position through the gear and the rack.

[0015] In some further optional technical solutions, the driving assembly further comprises a transmission shaft, a sealing sleeve and a cover, a side wall of the pipeline is provided with a second mounting hole, the sealing sleeve is arranged in the second mounting hole, the sealing sleeve is sleeved on the transmission shaft and sealingly matched with the transmission shaft, the cover covers the second mounting hole, a first end of the transmission shaft penetrates through the cover and is connected with the driving member, and a second end of the transmission shaft penetrates through a pipe wall of the pipeline and is connected with the gear.

[0016] In some further optional technical solutions, the flow detection device further comprises a first reflecting member and a second reflecting member, the first reflecting member and the second reflecting member are both arranged in the pipeline, the first reflecting member is located at the first end of the flow rate adjusting mechanism, and the second reflecting member is located at the second end of the flow rate adjusting mechanism; the first reflecting member and the second reflecting member are both provided with an avoiding channel, the avoiding channel is opposite to the flow rate adjusting channel, and the avoiding channel of the first reflecting member and the avoiding channel of the second reflecting member are communicated through the flow rate adjusting channel in the case that the flow rate adjusting mechanism is in the second state.

[0017] In some further optional technical solutions, the first reflecting member and the second reflecting member both comprise a bracket and a reflecting sheet, the bracket is fixedly arranged in the lumen of the pipeline, the bracket is provided with a mounting groove, and the reflecting sheet is positioned and matched with the mounting groove.

[0018] In another aspect, the application provides a flow detection method, comprising:

[0019] collecting an actual flow rate value of the fluid in the flow rate adjusting mechanism between the first transducer and the second transducer;

[0020] determining whether the actual flow rate value is within a preset target flow rate range;

[0021] in the case that the actual flow rate value is outside the target flow rate range, adjusting the flow area of the flow rate adjusting mechanism so that the actual flow rate value is within the target flow rate range;

[0022] in the case that the actual flow rate value is within the target flow rate range, determining the fluid flow rate passing through the flow rate adjusting mechanism according to the actual flow rate value and the flow area of the current flow rate adjusting mechanism.

[0023] In some further optional technical solutions, in the case that the actual flow rate value is outside the target flow rate range, adjusting the flow area of the flow rate adjusting mechanism so that the actual flow rate value is within the target flow rate range, comprises:

[0024] determining a first flow area value for controlling the flow area size of the flow rate adjusting mechanism according to the actual flow rate value, the preset target flow rate, and the flow area of the current flow rate adjusting mechanism;

[0025] adjusting the flow area of the flow rate adjusting mechanism according to the first flow area value.

[0026] The flow detection device provided in the application is characterized in that the flow rate adjusting mechanism is arranged between the first transducer and the second transducer, and the flow rate of the fluid flowing through the pipeline between the first transducer and the second transducer can be adjusted by the flow rate adjusting mechanism, so as to avoid that the flow rate of the fluid in the fluid channel between the first transducer and the second transducer is too large or too small. Specifically, in the case that the fluid flow in the pipeline increases, the flow rate adjusting mechanism can be adjusted to the second state, so as to increase the flow area of the flow rate adjusting mechanism, and ensure that the flow rate of the fluid flowing through the pipeline between the first transducer and the second transducer is within the preset range. In the case that the fluid flow in the pipeline decreases, the flow rate adjusting mechanism can be adjusted to the first state, so as to reduce the flow area of the flow rate adjusting mechanism, and ensure that the flow rate of the fluid flowing through the pipeline between the first transducer and the second transducer is within the preset range. Therefore, the flow rate adjusting device provided in the application can avoid that the increase or decrease of the fluid flow in the pipeline changes the flow rate of the fluid in the pipeline between the first transducer and the second transducer, and thus is beneficial to ensure the stability of the fluid form in the pipeline between the first transducer and the second transducer during the flow detection process, and thus improves the stability of the detection precision of the flow detection device. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the application and, together with the description, further serve to explain the principles of the application.

[0028] Figure 1 An exploded view of the flow detection device in some optional embodiments of the application;

[0029] Figure 2 An assembly view of the flow detection device in some optional embodiments of the application;

[0030] Figure 3 A schematic view of the pipeline in some optional embodiments of the application;

[0031] Figure 4 A sectional view of the flow detection device in some optional embodiments of the application;

[0032] Figure 5 An assembly view of the flow rate adjusting mechanism, the first reflecting member and the second reflecting member in some optional embodiments of the application;

[0033] Figure 6 A schematic view of the flow rate adjusting mechanism in the first state in some optional embodiments of the application;

[0034] Figure 7 A schematic view of the flow rate adjusting mechanism in the second state in some optional embodiments of the application;

[0035] Figure 8Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0036] Figure 9 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0037] Figure 10 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0038] Figure 11 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0039] Figure 12 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0040] Figure 13 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0041] Figure 14 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0042] Figure 15 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0043] Figure 16 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0044] Figure 17 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0045] Figure 18 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0046] Figure 19 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0047] Figure 20 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0048] Figure 21 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0049] Figure 22 Fig. 2 is a schematic view of a flow rate adjustment mechanism in accordance with some embodiments of the present application;

[0050] Figure 23The control schematic diagram of the flow detection device in some optional embodiments of the present application;

[0051] Figure 24 The flow chart of the flow detection method in some optional embodiments of the present application.

[0052] The description of reference signs: 100-pipe; 110-first mounting hole; 120-second mounting hole; 130-connection part; 200-first transducer; 300-second transducer; 400-flow rate adjusting mechanism; 401-flow rate adjusting channel; 402-main channel; 410-first adjusting member; 411-first flow rate adjusting part; 412-main body part; 420-second adjusting member; 421-second flow rate adjusting part; 422-cylinder part; 430-driving assembly; 431-gear; 432-rack; 433-transmission shaft; 4331-first connecting section; 4332-second connecting section; 4333-sealing section; 4334-second sealing groove; 434-sealing sleeve; 4341-first sealing groove; 435-cover; 436-sealing member; 500-first reflecting member; 510-avoiding channel; 520-bracket; 521-mounting groove; 522-third sealing groove; 530-sealing ring; 600-second reflecting member; 700-controller.

[0053] The specific embodiments of the present application have been shown in the above-mentioned drawings, and will be described in more detail hereinafter. These drawings and the written description are not intended to restrict the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0054] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description of the exemplary embodiments is intended to apply to various alternative embodiments of the application. It is to be understood that the following description is not intended to limit the application to the exact embodiment described. It is to be understood that the exemplary embodiments are merely examples of how the application can be implemented.

[0055] In the related art, in order to improve the measurement accuracy of the ultrasonic water meter, a flow guide pipe with a small diameter is arranged between the first ultrasonic transducer and the second ultrasonic transducer, so as to reduce the flow area of the fluid flow passage between the first ultrasonic transducer and the second ultrasonic transducer, increase the flow rate of the fluid in the pipe between the first ultrasonic transducer and the second ultrasonic transducer, and then increase the time difference of the ultrasonic signals of the forward and reverse flows, so as to improve the measurement accuracy of the ultrasonic water meter.

[0056] However, the inventors find that, in the process of implementing the flow detection device provided in the present application, when the flow rate of the fluid passing between the first ultrasonic transducer and the second ultrasonic transducer is small, the time difference of the forward and reverse flow ultrasonic signals is small, which leads to the decrease of the accuracy of the ultrasonic water meter. When the flow rate of the fluid passing between the first ultrasonic transducer and the second ultrasonic transducer is large, the main sound beam of the ultrasonic signal emitted by the first ultrasonic transducer or the second ultrasonic transducer is affected by the fluid and deviates, which leads to the decrease of the intensity of the received ultrasonic signal, and further leads to the decrease of the accuracy of the ultrasonic water meter. That is, when the flow rate of the fluid in the liquid conveying pipeline changes, the flow rate of the fluid passing between the first ultrasonic transducer and the second ultrasonic transducer changes, which easily leads to the inconsistency of the measurement accuracy.

[0057] To solve the above problems, the present application provides a flow detection device and a flow detection method. The flow detection device adjusts the flow area of the fluid flow passage between the first transducer and the second transducer through the flow rate adjusting mechanism, so as to keep the flow rate of the fluid between the first transducer and the second transducer within the preset flow rate range. The preset flow rate range can be the range of the required flow rate of the fluid between the first transducer and the second transducer when the detection accuracy of the flow detection device reaches the required detection accuracy. Alternatively, in the actual production process, the corresponding preset flow rate range can be set according to the actual accuracy requirement.

[0058] Further, in the case of connecting the flow detection device to the pipeline with different flow rates or connecting the flow detection device to the pipeline with fluctuating flow rate, the measurement accuracy of the flow detection device can be ensured to be consistent.

[0059] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes can not be described in detail in some examples. The following will be described in combination with Figures 1 to 24 The embodiments of the present application are described.

[0060] Reference is made to Figures 1 to 7 In some optional embodiments, the flow detection device includes a pipeline 100, a first transducer 200, a second transducer 300, and a flow rate adjusting mechanism 400. Optionally, the pipeline 100 is a basic structural member, which can provide a mounting base for the first transducer 200, the second transducer 300, and / or the flow rate adjusting mechanism 400.

[0061] In some optional embodiments, the pipe 100 is provided with a connecting portion 130 at each end of the pipe 100, so that the pipe 100 can be connected to a fluid conveying pipeline through the connecting portion 130. Optionally, the connecting portion 130 can be provided with a thread, so that the pipe 100 can be connected to the fluid conveying pipeline through the thread.

[0062] In some optional embodiments, the first transducer 200 and the second transducer 300 are arranged in the pipe 100 and communicate with the lumen of the pipe 100. The flow rate adjusting mechanism 400 is arranged in the lumen of the pipe 100 between the first transducer 200 and the second transducer 300, so as to adjust the flow rate of the fluid in the pipe 100 between the first transducer 200 and the second transducer 300 through the flow rate adjusting mechanism 400. The first transducer 200 and the second transducer 300 communicate with the lumen of the pipe 100, so that the detection signals emitted by the first transducer 200 and the second transducer 300 can enter the lumen of the pipe 100.

[0063] Optionally, the detection signal emitted by the first transducer 200 enters the lumen of the pipe 100 between the first transducer 200 and the second transducer 300 and is transmitted to the second transducer 300, so that the second transducer 300 can receive the detection signal emitted by the first transducer 200. The detection signal emitted by the second transducer 300 enters the lumen of the pipe 100 between the first transducer 200 and the second transducer 300 and is transmitted to the first transducer 200, so that the first transducer 200 can receive the detection signal emitted by the second transducer 300.

[0064] Referring to Figures 1 to 4 In some optional embodiments, the pipe 100 is provided with two first mounting holes 110 arranged along the flow direction of the pipe 100, so as to provide a mounting basis for the first transducer 200 and the second transducer 300. Further optionally, the two first mounting holes 110 each penetrate the pipe wall of the pipe 100 and communicate with the lumen of the pipe 100. The flow direction of the pipe 100 is the flow direction of the fluid in the pipe 100 without disturbance.

[0065] In some embodiments, the first transducer 200 and the second transducer 300 are arranged outside the pipe 100, so that the detection signals emitted by the first transducer 200 and the second transducer 300 can enter the pipe 100 from the first mounting hole 110 and be transmitted out of the pipe 100 from the first mounting hole 110.

[0066] In some other optional embodiments, the first transducer 200 and the second transducer 300 can be arranged in the pipe 100, and the first transducer 200 and the second transducer 300 can be loaded into the pipe 100 from the first mounting hole 110 or taken out of the pipe 100.

[0067] Optionally, of the two first mounting holes 110, one is located at one side of the first end of the flow rate adjusting mechanism 400, and the other is located at one side of the second end of the flow rate adjusting mechanism 400. For example, the first transducer 200 is arranged in the first mounting hole 110 located at one side of the first end of the flow rate adjusting mechanism 400, and the second transducer 300 is arranged in the first mounting hole 110 located at one side of the second end of the flow rate adjusting mechanism 400.

[0068] In some optional embodiments, the first transducer 200 and the second transducer 300 are both ultrasonic transducers, so that the first transducer 200 and the second transducer 300 can both emit ultrasonic signals. For example, the first ultrasonic signal emitted by the first transducer 200 reaches the second transducer 300 through the pipeline 100 between the first transducer 200 and the second transducer 300. The time required for the first ultrasonic signal to travel from the first transducer 200 to the second transducer 300 is a first time length. The second ultrasonic signal emitted by the second transducer 300 reaches the first transducer 200 through the pipeline 100 between the first transducer 200 and the second transducer 300. The time required for the second ultrasonic signal to travel from the second transducer 300 to the first transducer 200 is a second time length. The flow rate of the fluid flowing through the pipeline 100 between the first transducer 200 and the second transducer 300 is determined according to the difference between the first time length and the second time length.

[0069] In some optional embodiments, the flow rate adjusting mechanism 400 is configured to switch between a first state and a second state. When the flow rate adjusting mechanism 400 is in the first state, the flow area of the flow rate adjusting mechanism 400 is a first area. When the flow rate adjusting mechanism 400 is in the second state, the flow area of the flow rate adjusting mechanism 400 is a second area, and the second area is greater than the first area. Optionally, the flow area of the flow rate adjusting mechanism 400 is the cross-sectional area of the channel in the flow rate adjusting mechanism 400 for the fluid to pass through, in a direction perpendicular to the flow direction of the channel. The flow direction of the channel is the flow direction of the fluid passing through the channel without disturbance.

[0070] The flow rate adjusting device provided by the above embodiments can adjust the flow rate of the fluid passing through the flow rate adjusting mechanism 400 by adjusting the state of the flow rate adjusting mechanism 400, thereby changing the flow area of the flow rate adjusting mechanism 400, and further adjusting the flow rate of the fluid passing through the flow rate adjusting mechanism 400, so as to ensure that the flow rate of the fluid passing through the flow rate adjusting mechanism 400 is within a preset range, and improve the detection accuracy of the flow rate detection device. Moreover, the flow rate of the fluid between the first transducer 200 and the second transducer 300 can be controlled to be in a laminar flow state by controlling the flow rate of the fluid passing through the flow rate adjusting mechanism 400, thereby reducing the influence of the form of the fluid between the first transducer 200 and the second transducer 300 on the detection signal, and improving the accuracy of ultrasonic measurement.

[0071] In addition, the flow regulating device provided by the above embodiment can adjust the flow area of the flow rate regulating mechanism 400 according to the flow rate of the fluid entering the pipe, so as to ensure that the flow rate of the fluid passing through the flow rate regulating mechanism 400 is within the preset range, and also reduce the pressure loss during the fluid transmission, and thus can be applied to fluid transmission pipes with different flow rates.

[0072] In the related art, the fluid inlet end of the ultrasonic water meter is provided with a regulating valve, so as to adjust the flow rate passing through the ultrasonic water meter through the regulating valve, so as to ensure that the flow rate in the ultrasonic water meter is constant, thereby improving the detection accuracy. However, this will cause an increase in pressure loss during fluid transmission. In addition, by controlling the inflow amount of the ultrasonic water meter, the flow rate of the fluid after passing through the ultrasonic water meter will be constant, and thus cannot be applied to fluid transmission pipes with adjustable flow rates. The flow regulating device provided by the above embodiment adjusts the flow area of the flow rate regulating mechanism 400, which not only helps to ensure that the flow rate of the fluid in the flow rate regulating mechanism 400 is within the preset flow rate range, but also can be applied to fluid transmission pipes with different flow rates or adjustable flow rates.

[0073] In some optional embodiments, the pipe 100 includes a fluid inlet and a fluid outlet. For example, the fluid inlet is connected to an upstream pipe junction in the pipe to be detected, so that the fluid can enter the pipe 100 from the fluid transmission pipe. In further optional embodiments, the fluid outlet is connected to a downstream pipe junction in the pipe to be detected, so that the fluid passing through the flow detection device can enter the fluid transmission pipe.

[0074] In some optional embodiments, the second area is greater than the flow area of the fluid inlet and / or the fluid outlet. Further optionally, the first area is less than the flow area of the fluid inlet and / or the fluid outlet. This embodiment can adjust the flow rate of the fluid passing through the pipe 100 between the first transducer 200 and the second transducer 300 to be greater than or less than the flow rate of the fluid entering the pipe 100 through the flow rate regulating mechanism 400, thereby helping to improve the application range of the flow detection device.

[0075] In some further optional embodiments, as Figure 6 and Figure 7As shown, the flow rate adjusting mechanism 400 includes a first adjusting member 410 and a second adjusting member 420. The first adjusting member 410 includes a first flow rate adjusting portion 411. The second adjusting member 420 includes a second flow rate adjusting portion 421. The first adjusting member 410 is configured to move relative to the second adjusting member 420 between a first position and a second position. Optionally, when the flow rate adjusting mechanism 400 is in the first state, the first flow rate adjusting portion 411 and the second flow rate adjusting portion 421 are arranged in the flow direction of the pipe 100, and the first flow rate adjusting portion 411 and the second flow rate adjusting portion 421 at least partially overlap. Optionally, the first flow rate adjusting portion 411 abuts against one side of the second flow rate adjusting portion 421. Exemplarily, the first flow rate adjusting portion 411 and the second flow rate adjusting portion 421 are in sliding fit.

[0076] Optionally, the first adjusting member 410 is configured to rotate relative to the second adjusting member 420 between the first position and the second position. Optionally, the first adjusting member 410 and the second adjusting member 420 are in rotational fit, so as to switch the state of the flow rate adjusting mechanism 400 by relative rotation of the first adjusting member 410 and the second adjusting member 420.

[0077] In some other optional embodiments, the first adjusting member 410 and the second adjusting member 420 can also be configured to move relative to each other in translation. Exemplarily, the first adjusting member 410 and the second adjusting member 420 can also be in sliding fit, so as to adjust the size of the flow area of the flow rate adjusting mechanism 400 by moving the first adjusting member 410 and the second adjusting member 420 away from or close to each other.

[0078] Referring to Figure 6 When the first adjusting member 410 is located at the first position relative to the second adjusting member 420, the overlapping area of the projections of the first flow rate adjusting portion 411 and the second flow rate adjusting portion 421 in the flow direction of the pipe 100 is a third area. Optionally, when the first adjusting member 410 is located at the first position relative to the second adjusting member 420, the first flow rate adjusting portion 411 and the second flow rate adjusting portion 421 overlap in the flow direction of the pipe 100.

[0079] Referring to Figure 7 When the first adjusting member 410 is located at the second position relative to the second adjusting member 420, the overlapping area of the projections of the first flow rate adjusting portion 411 and the second flow rate adjusting portion 421 in the flow direction of the pipe 100 is a fourth area, and the fourth area is greater than the third area.

[0080] The greater the overlapping area of the projections of the first flow rate adjusting part 411 and the second flow rate adjusting part 421 in the flow direction of the pipe 100, the smaller the flow area of the flow rate adjusting mechanism 400. For example, when the first adjusting part 410 is located at the first position relative to the second adjusting part 420, the flow rate adjusting mechanism 400 is in the second state. When the first adjusting part 410 is located at the second position relative to the second adjusting part 420, the flow rate adjusting mechanism 400 is in the first state.

[0081] The flow rate adjusting mechanism 400 can adjust the flow area by rotating or moving the first adjusting part 410 and the second adjusting part 420, so that the flow rate of the fluid in the flow rate adjusting mechanism 400 is within the preset flow rate range.

[0082] In some optional embodiments, referring to Figures 5 to 11 、 Figure 14 and Figure 15 , the second adjusting part 420 further comprises a barrel part 422 connected to the second flow rate adjusting part 421. Further optionally, the outer diameter of the barrel part 422 is smaller than the inner diameter of the pipe 100, and the outer peripheral wall of the barrel part 422 and the inner side wall of the pipe 100 form a flow rate adjusting passage 401. At least part of the second flow rate adjusting part 421 protrudes from the outer peripheral wall of the barrel part 422, and the first flow rate adjusting part 411 is located in the flow rate adjusting passage 401. Figure 6 、 Figure 7 、 Figure 14 and Figure 15 In some optional embodiments, the passage in the barrel part 422 is the main passage 402, so that the fluid can pass through the flow rate adjusting mechanism 400 along the main passage 402.

[0083] In the above embodiments, two fluid transmission passages can be formed between the second adjusting part 420 and the pipe 100, i.e., the flow area of the flow rate adjusting mechanism 400 is the sum of the flow area of the main passage 402 and the flow area of the flow rate adjusting passage 401. At least part of the second flow rate adjusting part 421 protrudes from the outer peripheral wall of the barrel part 422, and the first flow rate adjusting part 411 is located in the flow rate adjusting passage 401, so that the first flow rate adjusting part 411 and the second flow rate adjusting part 421 can block the flow of fluid in the flow rate adjusting passage 401.

[0084] Therefore, the flow area of the flow rate adjusting passage 401 is increased or decreased during the movement of the first adjusting member 410 relative to the second adjusting member 420 between the first position and the second position, thereby adjusting the flow area of the flow rate adjusting mechanism 400. In addition, the flow area of the barrel portion 422 in the flow detection device provided by the above embodiment can remain unchanged to provide a transmission channel for the detection signals emitted by the first transducer 200 and / or the second transducer 300. Moreover, the first flow rate adjusting portion 411 and the second flow rate adjusting portion 421 can also avoid blocking the fluid in the main passage 402 and interfering with the fluid pattern, thereby benefiting the detection accuracy of the flow detection device.

[0085] In some optional embodiments, as shown in Figure 10 , Figure 11 and Figure 14 , the barrel portion 422 and the pipe 100 can form an annular flow rate adjusting passage 401. Further optionally, the barrel portion 422 is cylindrical, the pipe 100 is a cylindrical passage, and the barrel portion 422 is coaxially arranged with the pipe 100.

[0086] In some optional embodiments, the first flow rate adjusting portion 411 can be a protruding structure arranged on the inner side wall of the pipe 100. The second flow rate adjusting portion 421 can be a protruding structure arranged on the outer side wall of the barrel portion 422. Further, the second adjusting member 420 can be rotationally matched with the pipe 100, so that the second adjusting member 420 can rotate relative to the first flow rate adjusting portion 411 to adjust the size of the flow area of the flow rate adjusting mechanism 400.

[0087] In other optional embodiments, the second adjusting member 420 can be fixedly arranged in the pipe 100, and the first adjusting member 410 is movably arranged between the barrel portion 422 and the pipe 100, so as to adjust the size of the flow area of the flow rate adjusting mechanism 400 by moving the first adjusting member 410 relative to the barrel portion 422.

[0088] In some optional embodiments, as shown in Figures 6 to 9 , the first flow rate adjusting portion 411 and the second flow rate adjusting portion 421 can both be arranged as arc-shaped blocks. Further optionally, the second flow rate adjusting portion 421 is an arc-shaped block arranged on the outer surface of the barrel portion 422. Further optionally, the thicknesses of the first flow rate adjusting portion 411 and the second flow rate adjusting portion 421 in the radial direction are equal, thereby benefiting the control of the variation amount of the flow area of the flow rate adjusting mechanism 400. In some optional embodiments, the size of the variation amount of the flow area of the flow rate adjusting mechanism 400 can be adjusted according to the angle of relative rotation of the first adjusting member 410 and the second adjusting member 420.

[0089] In some alternative embodiments, the first adjusting member 410 is sleeved on the barrel portion 422 and rotationally cooperates with the barrel portion 422 to adjust the flow area of the flow rate adjusting mechanism 400 by relative rotation of the first adjusting member 410 and the second adjusting member 420. In further alternative embodiments, the first adjusting member 410 comprises a main body portion 412 connected with the first flow rate adjusting portion 411 to form a ring structure.

[0090] In the above embodiments, the first adjusting member 410 is sleeved on the barrel portion 422, which is beneficial to improve the stability of the assembly between the first adjusting member 410 and the second adjusting member 420.

[0091] In some further alternative embodiments, the barrel portion 422 comprises a first segment and a second segment connected with the first segment. In further alternative embodiments, the second flow rate adjusting portion 421 is arranged on the first segment of the barrel portion 422, and the first adjusting member 410 is sleeved on the second segment. In further alternative embodiments, at least a part of the first adjusting member 410 abuts against the second flow rate adjusting portion 421 to limit the position of the first adjusting member 410 and the second flow rate adjusting portion 421.

[0092] Referring to Figures 6 to 9 In some alternative embodiments, the main body portion 412 can be a ring structure, and the first flow rate adjusting portion 411 is connected to the inner side wall and / or the outer side wall of the main body portion 412. Alternatively, the main body portion 412 and the first flow rate adjusting portion 411 are an integral structure.

[0093] Referring to Figure 9 In some alternative embodiments, the main body portion 412 is a cylindrical structure. Alternatively, the first flow rate adjusting portion 411 is arranged on the inner side wall of the main body portion 412 and protrudes from the inner side wall of the main body portion 412. In further alternative embodiments, the first flow rate adjusting portion 411 can be an arc-shaped protrusion arranged on the inner side wall of the main body portion 412, so that the inner side wall of the main body portion 412 and the outer side wall of the barrel portion 422 can form a channel for fluid to pass through.

[0094] In some alternative embodiments, the first flow rate adjusting portion 411 is arranged on the outer side wall of the main body portion 412 and protrudes from the outer side wall of the main body portion 412. In further alternative embodiments, the first flow rate adjusting portion 411 can be an arc-shaped protrusion arranged on the outer side wall of the main body portion 412, so that the main body portion 412 and the inner side wall of the pipeline 100 can form a channel for fluid to pass through.

[0095] In some alternative embodiments, the first adjusting member 410 can be a cylindrical structure, and a second passage is formed through the first adjusting member 410 along the flow direction of the pipe 100 on the wall of the first adjusting member 410, so as to increase or decrease the flow area of the second passage blocked by the second adjusting member 420 by adjusting the relative position of the second adjusting member 420 and the first adjusting member 410, so as to adjust the flow area of the flow rate adjusting mechanism 400.

[0096] Referring to Figure 13 In some alternative embodiments, the first adjusting member 410 includes a plurality of first flow rate adjusting portions 411. For example, the first adjusting member 410 includes two first flow rate adjusting portions 411. Further alternatively, the plurality of first flow rate adjusting portions 411 are arranged at intervals around the cylindrical portion 422, so that a fluid transmission passage can be formed between two adjacent first flow rate adjusting portions 411. Alternatively, the plurality of first flow rate adjusting portions 411 can be uniformly distributed around the cylindrical portion 422.

[0097] Referring to Figure 14 and Figure 15 In some alternative embodiments, the second adjusting member 420 includes a plurality of second flow rate adjusting portions 421. Further alternatively, the plurality of first flow rate adjusting portions 411 and the plurality of second flow rate adjusting portions 421 are arranged at intervals along the circumferential direction of the cylindrical portion 422, and one first flow rate adjusting portion 411 corresponds to one second flow rate adjusting portion 421.

[0098] In the above embodiments, the plurality of first flow rate adjusting portions 411 and the plurality of second flow rate adjusting portions 421 are arranged at intervals around the cylindrical portion 422, which is beneficial to reduce the stroke of the rotation of the first adjusting member 410 and the second adjusting member 420, so as to quickly adjust the flow rate of the fluid in the flow rate adjusting mechanism 400 to a preset flow rate range, and improve the detection accuracy of the flow detection device.

[0099] In some alternative embodiments, as shown in Figure 13 The gap between two adjacent first flow rate adjusting portions 411 corresponds to a first central angle θ2. Referring to Figure 15 The second flow rate adjusting portion 421 corresponds to a second central angle θ1, and the second central angle θ1 is greater than or equal to the first central angle θ2, so that the second flow rate adjusting portion 421 can block the fluid flow passage formed between two adjacent first flow rate adjusting portions 411, which is beneficial to increase the adjustment range of the flow area of the flow rate adjusting mechanism 400. In some alternative embodiments, the first central angle θ2 is 90°, and the second central angle θ1 is 92.5°.

[0100] In some alternative embodiments, as shown in Figure 3As shown, the flow rate adjusting mechanism 400 further comprises a driving assembly 430. Optionally, the driving assembly 430 is connected with and drives one of the first adjusting member 410 and the second adjusting member 420 to rotate relative to the other between the first position and the second position.

[0101] Optionally, the first adjusting member 410 movably cooperates with the pipe 100, and the second adjusting member 420 is limitedly cooperated with the pipe 100. Further, the driving assembly 430 is drivingly connected with the first adjusting member 410, and the driving assembly 430 can drive the first adjusting member 410 to move relative to the pipe 100, thereby realizing the movement of the first adjusting member 410 relative to the second adjusting member 420 between the first position and the second position. For example, the first adjusting member 410 is rotatably cooperated with the pipe 100, so that the first adjusting member 410 is driven to rotate relative to the pipe 100 by the driving assembly 430, thereby realizing the rotation of the first adjusting member 410 relative to the second adjusting member 420 between the first position and the second position.

[0102] In some other optional embodiments, the second adjusting member 420 movably cooperates with the pipe 100, and the first adjusting member 410 is limitedly cooperated with the pipe 100. Further, the driving assembly 430 is drivingly connected with the second adjusting member 420, and the driving assembly 430 drives the second adjusting member 420 to move relative to the first adjusting member 410 between the first position and the second position.

[0103] In some further optional embodiments, as shown, Figure 23 The flow rate detecting device further comprises a controller 700. Further optionally, the controller 700 is connected with the first transducer 200 and the second transducer 300 respectively, and the controller 700 can determine the first time interval according to the time interval between the emission of the ultrasonic signal by the first transducer 200 and the reception of the ultrasonic signal by the second transducer 300. Further, the second time interval is obtained according to the time interval between the emission of the ultrasonic signal by the second transducer 300 and the reception of the ultrasonic signal by the first transducer 200. And further, the flow rate of the fluid passing through the flow rate detecting device is determined according to the difference between the first time interval and the second time interval.

[0104] In some further optional embodiments, the flow rate of the fluid passing through the flow rate adjusting mechanism 400 can be determined according to the difference between the first time interval and the second time interval, and further, the flow rate of the fluid passing through the flow rate detecting device is determined according to the flow rate of the fluid in the flow rate adjusting mechanism 400 and the current flow area of the flow rate adjusting mechanism 400.

[0105] In some further optional embodiments, the controller 700 can control the flow rate adjusting mechanism 400 according to the detected flow rate of the fluid in the flow rate adjusting mechanism 400 and the preset flow rate range, so as to adjust the flow rate of the fluid passing through the flow rate adjusting mechanism 400.

[0106] Exemplarily, in a case that the flow rate of the fluid in the flow rate adjusting mechanism 400 is greater than the preset flow rate range, the flow rate of the fluid in the flow rate adjusting mechanism 400 can be reduced by increasing the flow area of the flow rate adjusting mechanism 400. In a case that the flow rate of the fluid in the flow rate adjusting mechanism 400 is less than the preset flow rate range, the flow rate of the fluid in the flow rate adjusting mechanism 400 can be increased by decreasing the flow area of the flow rate adjusting mechanism 400. Therefore, the flow detection device provided by the above embodiment can not only adapt to the change of the flow rate or the pressure of the fluid in the pipeline, but also improve the detection accuracy of the flow detection device.

[0107] In some optional embodiments, the driving assembly 430 comprises a driving member, a gear 431 and a rack 432. The rack 432 is arranged on the first adjusting member 410 or the second adjusting member 420, and the gear 431 is engaged with the rack 432. The driving member is connected with the gear 431, and the driving member drives one of the first adjusting member 410 and the second adjusting member 420 to rotate relative to the other between the first position and the second position through the gear 431 and the rack 432.

[0108] In the above embodiment, the driving member drives the first adjusting member 410 to rotate relative to the second adjusting member 420 between the first position and the second position through the gear 431 and the rack 432, which is beneficial to improve the transmission accuracy, improve the accuracy of the relative transmission angle of the first adjusting member 410 and the second adjusting member 420, and further improve the accuracy of adjusting the flow area of the flow rate adjusting mechanism 400 and the detection accuracy of the flow detection device.

[0109] In a further optional embodiment, the driving member can be a stepper motor. Exemplarily, the step angle a of the driving member is less than or equal to 3°. The step angle a of the stepper motor is the angle through which the rotor turns when the energization state of the winding of the stepper motor changes once. The step angle a is generally determined by the number of stator phases, the number of rotor teeth and the energization mode. The stepper motor is an actuator that converts electrical pulses into angular displacement. The stepper driver receives a pulse signal and drives the stepper motor to rotate in a set direction by a fixed angle, which is called “step angle”. Therefore, the rotation of the stepper motor is step by step at a fixed angle. The angular displacement can be controlled by controlling the number of pulses, so as to accurately position the first adjusting member 410 relative to the second adjusting member 420, and accurately adjust the size of the flow area of the flow rate adjusting mechanism 400.

[0110] Reference Figure 4 and Figure 5In some optional embodiments, the outer sidewall of the first adjusting member 410 is provided with a receiving groove, and the rack 432 is arranged on the groove wall of the receiving groove. Further optionally, a further optional gear 431 is arranged in the receiving groove and meshes with the rack 432 in the receiving groove. Further optionally, the receiving groove can be an arc-shaped groove arranged on the outer sidewall of the first adjusting member 410. Optionally, the receiving groove is arranged on the side of the first flow rate adjusting portion 411 away from the barrel portion 422, and the groove depth of the receiving groove is smaller than the thickness of the first flow rate adjusting portion 411 in the radial direction, i.e., the receiving groove does not penetrate through the first flow rate adjusting portion 411, thereby being beneficial to preventing the fluid from entering the receiving groove.

[0111] In further optional embodiments, the gear 431 is recessed in the receiving groove, so as to avoid the gear 431 protruding from the outer sidewall of the first flow rate adjusting portion 411, thereby being beneficial to reducing the gap between the first adjusting member 410 and the pipeline 100 and improving the tightness of the assembly of the first adjusting member 410 and the pipeline 100.

[0112] In some optional embodiments, the main body portion 412 can have a cylindrical structure, and the first flow rate adjusting portion 411 is located on the inner sidewall of the main body portion 412. Further optionally, the receiving groove is arranged on the outer sidewall of the main body portion 412. Further optionally, the outer sidewall of the main body portion 412 is in sealing fit with the inner sidewall of the pipeline 100, so as to further prevent the fluid from entering the receiving groove.

[0113] In some further optional embodiments, the receiving groove is arranged on the part of the main body portion 412 and the first flow rate adjusting portion 411 that overlap in the radial direction, so that the receiving groove can penetrate through the main body portion 412 and be at least partially recessed in the first flow rate adjusting portion 411.

[0114] The above embodiments can reduce the thickness of the main body portion 412 in the radial direction while keeping the groove depth of the receiving groove unchanged, thereby being beneficial to increasing the adjustment range of the flow area of the flow rate adjusting mechanism 400.

[0115] In some optional embodiments, the driving assembly 430 is arranged on the first adjusting member 410, and the driving assembly 430 is connected with the second adjusting member 420, so that the driving assembly 430 can drive the second adjusting member 420 to rotate relative to the first adjusting member 410. For example, the driving member and the gear 431 are arranged on the first adjusting member 410, and the driving member is connected with the gear 431, so that the driving member can drive the gear 431 to rotate. Further optionally, the rack 432 is arranged on the second adjusting member 420. In some further optional embodiments, the first adjusting member 410 is fixedly arranged on the pipeline 100. The driving member drives the gear 431 to rotate. The gear 431 meshes with the rack 432 to drive the second adjusting member 420 to rotate.

[0116] In some alternative embodiments, the driving assembly 430 is arranged on the second adjusting member 420, and the driving assembly 430 is connected with the first adjusting member 410, so that the driving assembly 430 can drive the first adjusting member 410 to rotate relative to the second adjusting member 420. For example, the second adjusting member 420 is fixedly arranged on the pipeline. The driving member and the gear 431 are arranged on the second adjusting member 420. The gear rack 432 is arranged on the first adjusting member 410. In some further alternative embodiments, the second adjusting member 420 is provided with a relief hole, and a transmission shaft connecting the driving member and the gear 431 penetrates the relief hole of the second adjusting member 420.

[0117] In some further alternative embodiments, as shown in Figure 16 the driving assembly 430 further comprises a transmission shaft 433, a sealing sleeve 434 and a cover 435.

[0118] The sidewall of the pipeline 100 is provided with a second mounting hole 120. The sealing sleeve 434 is arranged in the second mounting hole 120. The sealing sleeve 434 is sleeved on the transmission shaft 433 and sealingly matches the transmission shaft 433. The cover 435 covers the second mounting hole 120. The first end of the transmission shaft 433 penetrates the cover 435 and is connected with the driving member. The second end of the transmission shaft 433 penetrates the pipe wall of the pipeline 100 and is connected with the gear 431.

[0119] In the above embodiments, the sealing sleeve 434 is beneficial to improve the sealing performance between the driving assembly 430 and the pipeline 100, and is further beneficial to prevent the fluid in the pipeline 100 from flowing out.

[0120] Referring to Figures 17 to 19 In some alternative embodiments, the inner sidewall of the sealing sleeve 434 is provided with a first sealing groove 4341. The driving assembly 430 further comprises a sealing member 436, which is arranged in the first sealing groove 4341, and at least part of the sealing member 436 protrudes from the inner sidewall of the sealing sleeve 434. In some further alternative embodiments, the sealing member 436 is annular in structure, and the sealing member 436 is sleeved on the transmission shaft 433 and sealingly matches the outer sidewall of the transmission shaft 433.

[0121] In the above embodiments, the first sealing groove 4341 not only provides mounting space for the sealing member 436, but also limits the position of the sealing member 436, so as to improve the stability of the assembly of the sealing member 436. In addition, at least part of the sealing member 436 protrudes from the inner sidewall of the sealing sleeve 434, which is beneficial to reduce the frictional resistance of the transmission shaft 433 during rotation.

[0122] In some further optional embodiments, the first sealing groove 4341 may be an annular groove disposed on the inner sidewall of the sealing sleeve 434. The seal 436 may be a retaining ring. In some further optional embodiments, a second sealing groove 4334 is disposed on the outer sidewall of the drive shaft 433. Optionally, at least a portion of the seal 436 is located within the second sealing groove 4334.

[0123] In the above embodiments, the annular first sealing groove 4341 provides installation space for the annular seal 436 and helps to define the position of the seal 436 in the axial direction of the sealing sleeve 434, so as to prevent the seal 436 from sliding along the sealing sleeve 434, thereby improving the stability of the seal 436. In addition, the second sealing groove 4334 helps to improve the sealing performance between the seal 436 and the drive shaft 433, and helps to prevent the drive shaft 433 from sliding relative to the seal 436, thereby improving the stability of the assembly structure of the drive shaft 433, the sealing sleeve 434, and the seal 436.

[0124] In some further optional embodiments, the inner sidewall of the sealing sleeve 434 is provided with a plurality of first sealing grooves 4341. Optionally, the plurality of first sealing grooves 4341 may be spaced apart along the axial direction of the sealing sleeve 434. Further optionally, the outer sidewall of the drive shaft 433 is provided with a plurality of second sealing grooves 4334. The plurality of second sealing grooves 4334 are spaced apart along the axial direction of the drive shaft 433. In some optional embodiments, a seal 436 corresponds to one first sealing groove 4341 and one second sealing groove 4334 respectively.

[0125] In the above embodiments, the plurality of first sealing grooves 4341, the plurality of second sealing grooves 4334 and the plurality of sealing elements 436 can further improve the sealing performance between the drive shaft 433 and the sealing sleeve 434, which is beneficial to prevent fluid from flowing out of the pipe 100.

[0126] In some optional embodiments, the drive shaft 433 includes a first connecting section 4331, a second connecting section 4332, and a sealing section 4333. Optionally, the sealing section 4333 is connected between the first connecting section 4331 and the second connecting section 4332. Further optionally, a second sealing groove 4334 is disposed on the outer wall of the sealing section 4333. (See reference...) Figure 17 and Figure 19 In some optional embodiments, the sealing sleeve 434 is fitted onto the sealing section 4333 and seals with the sealing section 4333.

[0127] In further optional embodiments, the first connecting section 4331 and the second connecting section 4332 have a dimension in a radial direction of the transmission shaft 433 that is smaller than a dimension of the sealing section 4333 in the radial direction of the transmission shaft 433. In further optional embodiments, the second mounting hole 120 comprises a first hole section and a second hole section in communication with the first hole section. Optionally, the first hole section is located at an end of the second hole section closer to the inside of the pipe 100. Optionally, the first hole section has a smaller hole diameter than the second hole section, and a first positioning step is formed at the joint of the first hole section and the second hole section. In the case that the transmission shaft 433 is mounted in the second mounting hole 120, the end of the sealing section 4333 connected to the first connecting section 4331 abuts against the first positioning step. In further optional embodiments, the cover 435 covers an end of the second hole section away from the first hole section and forms a mounting cavity with the first hole section. Optionally, the second connecting section 4332 of the transmission shaft 433 penetrates the cover 435, and the end of the transmission shaft 433 connected to the second connecting section 4332 abuts against a side of the cover 435 facing the mounting cavity.

[0128] In some optional embodiments, the cover 435 can be connected with the pipe 100 through, but not limited to, screw connection, buckle connection or threaded connection. Optionally, the second mounting hole 120 is provided with internal threads, the cover 435 is provided with external threads, and the cover 435 is threadedly engaged with the internal wall of the second mounting hole 120.

[0129] In some optional embodiments, the side of the cover 435 facing the inside of the pipe 100 has a receiving groove, and the sealing sleeve 434 is at least partially located in the receiving groove. This embodiment is beneficial to further improve the sealing performance between the drive assembly 430 and the pipe 100.

[0130] Referring to Figure 16 and Figure 20 In some optional embodiments, the cover 435 comprises a threaded section and a detachable section connected to the threaded section. The threaded section is threadedly engaged with the second mounting hole 120. Further optionally, the detachable section is provided in a prismatic shape. For example, the detachable section is provided in a hexagonal shape to facilitate the detachment of the cover 435.

[0131] Referring to Figure 1 , Figure 4 , Figure 5 and Figure 22In some optional embodiments, the flow detection device further comprises a first counter member 500 and a second counter member 600. The first counter member 500 and the second counter member 600 are both arranged in the pipe 100, and the first counter member 500 is located at the first end of the flow rate adjusting mechanism 400, and the second counter member 600 is located at the second end of the flow rate adjusting mechanism 400. The first counter member 500 and the second counter member 600 are both provided with an avoiding passage 510, and the avoiding passage 510 is opposite to the flow rate adjusting passage 401. When the flow rate adjusting mechanism 400 is in the second state, the avoiding passage 510 of the first counter member 500 and the avoiding passage 510 of the second counter member 600 are communicated through the flow rate adjusting passage 401.

[0132] In some optional embodiments, the avoiding passage 510 of the first counter member 500 and the avoiding passage 510 of the second counter member 600 are opposite in the flow direction of the pipe 100. Further optionally, when the flow rate adjusting mechanism 400 is in the second state, the avoiding passage 510 is opposite to the gap between two adjacent first flow rate adjusting portions 411 and the gap between two adjacent second flow rate adjusting portions 421.

[0133] Optionally, the avoiding passage 510 can be a through hole or a groove arranged on the first counter member 500 or the second counter member 600, so as to avoid the first counter member 500 and the second counter member 600 from blocking the passage for the fluid to flow in the flow rate adjusting mechanism 400.

[0134] In some optional embodiments, the first counter member 500 is connected to the first end of the flow rate adjusting mechanism 400, and the second counter member 600 is connected to the second end of the flow rate adjusting mechanism 400. In some optional embodiments, the first counter member 500 and the second adjusting member 420 are respectively abutted to the two ends of the first adjusting member 410 in the flow direction of the pipe 100, so as to avoid the first adjusting member 410 from moving in the flow direction of the pipe 100 in the pipe 100. In some optional embodiments, the second counter member 600 is abutted to the side of the second adjusting member 420 away from the first counter member 500.

[0135] In some optional embodiments, the two ends of the barrel portion 422 of the second adjusting member 420 are respectively abutted to the first counter member 500 and the second counter member 600, which is beneficial to prevent the fluid in the barrel portion 422 from being disturbed during the flow rate adjustment, and is beneficial to improve the detection accuracy of the flow detection device.

[0136] Reference Figure 1 , Figure 4 and Figure 22In some optional embodiments, the first reflector 500 and the second reflector 600 are in sealing engagement with the inner side wall of the pipe 100. For example, the outer side wall of the first reflector 500 and the second reflector 600 is provided with a third sealing groove 522. Further optionally, the first reflector 500 and the second reflector 600 further comprise a sealing ring 530. Optionally, the sealing ring 530 is arranged in the third sealing groove 522, and at least part of the sealing ring 530 protrudes from the outer side wall of the first reflector 500 and the second reflector 600, so that the first reflector 500 and the second reflector 600 can be in sealing engagement with the inner side wall of the pipe 100 through the sealing ring 530.

[0137] With reference to Figure 4 As an optional embodiment, the first reflector 500 and the second reflector 600 are in fastening engagement with the pipe 100. Optionally, the first reflector 500 and the second reflector 600 can be fastened to the pipe 100 by screws.

[0138] In some optional embodiments, the first reflector 500 and the second reflector 600 each comprise a bracket 520 and a reflector sheet, wherein the bracket 520 is fixedly arranged in the lumen of the pipe 100 to provide a mounting basis for the reflector sheet through the bracket 520. The bracket 520 is provided with a mounting groove 521, and the reflector sheet is in positioning engagement with the mounting groove 521. Further optionally, the reflecting surface of the reflector sheet faces the first mounting hole 110, so that the detection signal reflected by the reflector sheet can reach the first transducer 200 or the second transducer 300 along the first mounting hole 110, and the detection signal emitted by the first transducer 200 and the second transducer 300 can be reflected by the reflector sheet.

[0139] In the above embodiments, the mounting groove 521 is beneficial to improve the mounting precision of the reflector sheet and the stability of the assembly of the reflector sheet and the bracket 520, and reduce the mounting difficulty of the reflector sheet.

[0140] In some optional embodiments, the flow detection device described in the present application can be, but is not limited to, an ultrasonic flowmeter.

[0141] On the other hand, the present application provides a flow detection method.

[0142] With reference to Figure 24 In some optional embodiments, the flow detection method described in the present application comprises:

[0143] Step S10: collecting an actual flow rate value of the fluid in the flow rate adjusting mechanism between the first transducer and the second transducer.

[0144] With reference to Figure 2 、 Figure 4 and Figure 23In some optional embodiments, the first transducer 200 emits a first ultrasonic signal.

[0145] The first ultrasonic signal reaches the second transducer 300 through the pipeline 100 between the first transducer 200 and the second transducer 300.

[0146] The controller 700 obtains a first time length of the first ultrasonic signal propagating from the first transducer 200 to the second transducer 300 according to a time when the first transducer 200 emits the first ultrasonic signal and a time when the second transducer 300 receives the first ultrasonic signal.

[0147] Further, the second transducer 300 emits a second ultrasonic signal. The second ultrasonic signal reaches the first transducer 200 through the pipeline 100 between the second transducer 300 and the first transducer 200. The controller 700 obtains a second time length of the second ultrasonic signal propagating from the second transducer 300 to the first transducer 200 according to a time when the second transducer 300 emits the second ultrasonic signal and a time when the first transducer 200 receives the second ultrasonic signal.

[0148] Further, the controller 700 can determine an actual flow rate value of the fluid in the flow rate adjusting mechanism 400 between the first transducer 200 and the second transducer 300 according to a difference between the first time length and the second time length.

[0149] Further, the controller 700 can determine an actual flow rate value of the fluid in the flow rate adjusting mechanism 400 between the first transducer 200 and the second transducer 300 according to a difference between the first time length and the second time length.

[0150] Step S30: judging whether the actual flow rate value is within a preset target flow rate range.

[0151] For example, the target flow rate range is set according to the detection accuracy of the flow rate detection device. For example, the preset target flow rate can be 0.1 m / s.

[0152] Step S50: in the case that the actual flow rate value is outside the target flow rate range, adjusting the through-flow area of the flow rate adjusting mechanism to make the actual flow rate value be within the target flow rate range.

[0153] Step S50: in the case that the actual flow rate value is outside the target flow rate range, adjusting the through-flow area of the flow rate adjusting mechanism to make the actual flow rate value be within the target flow rate range.

[0154] Optionally, in the case that the actual flow rate value is greater than the maximum value of the target flow rate range, the controller 700 controls the flow rate adjusting mechanism 400 to increase the through-flow area of the flow rate adjusting mechanism 400. For example, the controller 700 controls the flow rate adjusting mechanism 400 to switch to the second state to increase the through-flow area of the flow rate adjusting mechanism 400, thereby reducing the flow rate of the fluid at the flow rate adjusting mechanism 400.

[0155] Optionally, in the case that the actual flow rate value is greater than the maximum value of the target flow rate range, the controller 700 controls the flow rate adjusting mechanism 400 to increase the through-flow area of the flow rate adjusting mechanism 400. For example, the controller 700 controls the flow rate adjusting mechanism 400 to switch to the second state to increase the through-flow area of the flow rate adjusting mechanism 400, thereby reducing the flow rate of the fluid at the flow rate adjusting mechanism 400.

[0156] In the case that the actual flow rate value is less than the minimum value of the range of the target flow rate, the controller 700 controls the flow rate adjusting mechanism 400 to decrease the flow area of the flow rate adjusting mechanism 400. For example, the controller 700 controls the flow rate adjusting mechanism 400 to switch to the first state to decrease the flow area of the flow rate adjusting mechanism 400, thereby increasing the flow rate of the fluid at the flow rate adjusting mechanism 400.

[0157] 5 Step S70: In the case that the actual flow rate value is within the range of the target flow rate, the first flow area value is determined according to the actual flow rate value and the current flow area of the flow rate adjusting mechanism 400.

[0158] The flow area of the flow rate adjusting mechanism determines the flow rate of the fluid passing through the flow rate adjusting mechanism.

[0159] The flow detection method provided by the above embodiment acquires the flow rate of the fluid at the flow rate adjusting mechanism 400, i.e., the flow rate of the fluid between the first transducer 200 and the second transducer 300. The flow rate of the fluid at the flow rate adjusting mechanism 400 is detected only in the case that the flow rate of the fluid at the flow rate adjusting mechanism 400 is within the range of the preset target flow rate. Thus, it is beneficial to prevent the flow rate of the fluid at the flow rate adjusting mechanism 400 from being too large or too small to affect the flow detection accuracy.

[0160] The flow rate of the fluid passing through the flow rate adjusting mechanism 400 is determined only in the case that the flow rate of the fluid at the flow rate adjusting mechanism 400 is within the range of the preset target flow rate. Thus, it is beneficial to ensure that the flow detection structure is performed in the case that the flow rate of the fluid at the flow rate adjusting mechanism 400 is within the range of the preset target flow rate, thereby preventing the flow rate of the fluid at the flow rate adjusting mechanism 400 from being too large or too small to affect the flow detection accuracy.

[0161] In some optional embodiments, step S50, in the case that the actual flow rate value is outside the range of the target flow rate, the flow area of the flow rate adjusting mechanism 400 is adjusted to be within the range of the target flow rate, including:

[0162] Step S51: determining a first flow area value for controlling the flow area of the flow rate adjusting mechanism according to the actual flow rate value, the preset target flow rate, and the current flow area of the flow rate adjusting mechanism.

[0163] For example, in the case that the pressure and the flow rate of the fluid entering the flow detection device are constant, the flow rate of the fluid in the flow rate adjusting mechanism 400 is inversely proportional to the flow area of the flow rate adjusting mechanism 400. Thus, the controller 700 can determine the first flow area value according to the actual flow rate value, the preset target flow rate, and the current flow area of the flow rate adjusting mechanism 400.

[0164] Step S52: adjusting the flow area of the flow rate adjusting mechanism according to the first flow area value.

[0165] Further optionally, the controller 700 adjusts the flow area of the flow rate adjusting mechanism 400 according to the first flow area value.

[0166] In some alternative embodiments, the step S52 of adjusting the flow area of the flow rate adjusting mechanism according to the first flow area value comprises:

[0167] determining the amount of change of the flow area of the flow rate adjusting mechanism 400 according to the first flow area value and the current flow area of the flow rate adjusting mechanism 400;

[0168] determining the angle of relative rotation of the first adjusting member 410 and the second adjusting member 420 according to the amount of change of the flow area of the flow rate adjusting mechanism 400.

[0169] In some alternative embodiments, the flow detection method described herein can be applied to the flow detection device described herein. Alternatively, the flow detection method described herein can be used for detecting fluid flow in an ultrasonic flow meter.

[0170] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0171] It will be understood that the application is not limited to the precise structures herein described and illustrated in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application is indicated by the appended claims, rather than by the specification.

Claims

1. A flow detecting device, characterized by, The application relates to a flow rate regulating mechanism (400) for a flow rate sensor, comprising a pipe (100), a first transducer (200) and a second transducer (300) which are arranged in the pipe (100) and communicate with the pipe cavity of the pipe (100), and the flow rate regulating mechanism (400) is arranged in the pipe cavity of the pipe (100) between the first transducer (200) and the second transducer (300), The flow rate regulating mechanism (400) is configured to switch between a first state and a second state, in the case that the flow rate regulating mechanism (400) is in the first state, the flow area of the flow rate regulating mechanism (400) is a first area; In the case that the flow rate regulating mechanism (400) is in the second state, the flow area of the flow rate regulating mechanism (400) is a second area, and the second area is larger than the first area; The flow rate regulating mechanism (400) comprises a first adjusting member (410) and a second adjusting member (420), the first adjusting member (410) comprises a first flow rate adjusting part (411), the second adjusting member (420) comprises a second flow rate adjusting part (421), and the first adjusting member (410) is configured to move relative to the second adjusting member (420) between a first position and a second position, In the case that the first adjusting member (410) is located at the first position relative to the second adjusting member (420), the overlapping area of the projections of the first flow rate adjusting part (411) and the second flow rate adjusting part (421) in the flow direction of the pipe (100) is a third area; in the case that the first adjusting member (410) is located at the second position relative to the second adjusting member (420), the overlapping area of the projections of the first flow rate adjusting part (411) and the second flow rate adjusting part (421) in the flow direction of the pipe (100) is a fourth area, and the fourth area is larger than the third area.

2. The flow detection device of claim 1, wherein, The second adjusting member (420) further comprises a barrel part (422) connected with the second flow rate adjusting part (421), the outer diameter of the barrel part (422) is smaller than the inner diameter of the pipe (100), a flow rate regulating channel (401) is formed between the outer peripheral wall of the barrel part (422) and the inner side wall of the pipe (100), at least part of the second flow rate adjusting part (421) protrudes outward from the outer peripheral wall of the barrel part (422), and the first flow rate adjusting part (411) is located in the flow rate regulating channel (401).

3. The flow detection device of claim 2, wherein, The first adjusting member (410) is sleeved on the barrel part (422) and rotationally matched with the barrel part (422).

4. The flow detection device of claim 3, wherein, The first adjusting member (410) further comprises a main body part (412) which is connected with the first flow rate adjusting part (411) to form a ring structure.

5. The flow detection device of claim 2, wherein, The first adjusting member (410) comprises a plurality of first flow rate adjusting parts (411), and the second adjusting member (420) comprises a plurality of second flow rate adjusting parts (421), A plurality of the first flow rate adjusting portions (411) and a plurality of the second flow rate adjusting portions (421) are spaced apart along the outer circumferential direction of the barrel portion (422), and one of the first flow rate adjusting portions (411) corresponds to one of the second flow rate adjusting portions (421).

6. The flow detection device of claim 5, wherein, The gap between two adjacent first flow rate adjusting portions (411) corresponds to a first central angle, and the second flow rate adjusting portion (421) corresponds to a second central angle, and the second central angle is greater than or equal to the first central angle.

7. The flow detecting device according to any one of claims 1 to 6, characterized by The flow rate adjusting mechanism (400) further comprises a driving assembly (430) connected to and driving one of the first adjusting member (410) and the second adjusting member (420) to rotate relative to the other between the first position and the second position.

8. The flow detection device of claim 7, wherein, The driving assembly (430) comprises a driving member, a gear (431) and a rack (432), the rack (432) is arranged on the first adjusting member (410) or the second adjusting member (420), the gear (431) is engaged with the rack (432), the driving member is connected with the gear (431), and the driving member drives one of the first adjusting member (410) and the second adjusting member (420) to rotate relative to the other between the first position and the second position through the gear (431) and the rack (432).

9. The flow detection device of claim 8, wherein, The driving assembly (430) further comprises a transmission shaft (433), a sealing sleeve (434) and a cover (435), The side wall of the pipeline (100) is provided with a second mounting hole (120), the sealing sleeve (434) is arranged in the second mounting hole (120), the sealing sleeve (434) is sleeved on the transmission shaft (433) and sealingly matched with the transmission shaft (433), the cover (435) covers the second mounting hole (120), the first end of the transmission shaft (433) penetrates the cover (435) and is connected with the driving member, and the second end of the transmission shaft (433) penetrates the pipe wall of the pipeline (100) and is connected with the gear (431).

10. The flow detecting device according to any one of claims 2 to 6, wherein Further comprising a first reflecting member (500) and a second reflecting member (600), the first reflecting member (500) and the second reflecting member (600) are arranged in the pipeline (100), the first reflecting member (500) is located at the first end of the flow rate adjusting mechanism (400), and the second reflecting member (600) is located at the second end of the flow rate adjusting mechanism (400). The first reflecting member (500) and the second reflecting member (600) are both provided with an avoiding passage (510), the avoiding passage (510) is opposite to the flow rate adjusting passage (401), and the avoiding passage (510) of the first reflecting member (500) and the avoiding passage (510) of the second reflecting member (600) are communicated through the flow rate adjusting passage (401) when the flow rate adjusting mechanism (400) is in the second state.

11. The flow detection device of claim 10, wherein, The first reflector (500) and the second reflector (600) each comprise a bracket (520) and a reflecting sheet, the bracket (520) is fixedly arranged in the lumen of the pipeline (100), the bracket (520) is provided with a mounting groove (521), and the reflecting sheet is positioned and matched with the mounting groove (521).

12. A flow rate detection method, the method being applied to the flow rate detection apparatus according to any one of claims 1 to 11, characterized by, Comprise: Collecting an actual flow rate value of a fluid in a flow rate adjusting mechanism between a first transducer and a second transducer; Determining whether the actual flow rate value is within a preset target flow rate range; In a case where the actual flow rate value is outside the target flow rate range, adjusting a flow area of the flow rate adjusting mechanism so that the actual flow rate value is within the target flow rate range; In a case where the actual flow rate value is within the target flow rate range, determining a flow rate of the fluid through the flow rate adjusting mechanism according to the actual flow rate value and a current flow area of the flow rate adjusting mechanism.

13. The flow detection method of claim 12, wherein, In a case where the actual flow rate value is outside the target flow rate range, adjusting a flow area of the flow rate adjusting mechanism so that the actual flow rate value is within the target flow rate range, comprising: Determining a first flow area value for controlling a size of the flow area of the flow rate adjusting mechanism according to the actual flow rate value, the preset target flow rate and a current flow area of the flow rate adjusting mechanism; Adjusting the flow area of the flow rate adjusting mechanism according to the first flow area value.

Images