Device for detecting the pressure of a liquid flow in a pipe

Abstract

The present application relates to the technical field of pressure sensor, in particular to a device for detecting liquid flow pressure in pipeline. The device for detecting liquid flow pressure in pipeline comprises a pipeline, a circuit system and at least four sensing units, the at least four sensing units are electrically connected with the circuit system, every four sensing units constitute a venturi bridge structure, the pipeline is provided with at least four opening structures, one sensing unit is arranged in each opening structure, and the sensing unit detects the pressure of liquid flow in the pipeline through the opening structure. The problem that a large-size cavity needs to be made at the pressure sensing part of the fine pipeline to accommodate the pressure sensor, which destroys the consistency of the pipeline and brings errors to the detected pressure is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure sensor, in particular to a device for detecting liquid flow pressure in pipeline. BACKGROUND

[0002] It is a common requirement to monitor pressure in liquid flow channel. In order to obtain pressure data in pipeline, a pressure sensor is generally arranged on the inner wall of the pipeline. For large-size pipeline, this method is simple and effective. However, for fine pipeline, especially in the sub-millimeter size range, a large-size cavity needs to be made at the pressure sensing part to accommodate the pressure sensor. However, such a cavity destroys the consistency of the pipeline, increases the complexity of the inertia and pressure change of the liquid flow, and brings errors to the detected pressure. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application provides a device for detecting liquid flow pressure in pipeline, which aims to solve the problem that in fine pipeline, a large-size cavity needs to be made at the pressure sensing part to accommodate the pressure sensor, which destroys the consistency of the pipeline and brings errors to the detected pressure.

[0004] The technical scheme provided by the present application is as follows:

[0005] A device for detecting liquid flow pressure in pipeline, comprising a pipeline, a circuit system and at least four sensing units, the at least four sensing units being electrically connected to the circuit system, every four sensing units forming a Venturi bridge structure, the pipeline being provided with at least four opening structures, one sensing unit being arranged in each opening structure, the sensing unit detecting the pressure of liquid flow in the pipeline through the opening structure.

[0006] Further, the sensing unit cover is arranged on the opening structure, and the connection between the sensing unit and the opening edge of the opening structure is a sealed connection.

[0007] Further, the opening structure is provided with a first pipe, the first pipe comprising an open first end, a closed second end and a pipe cavity, the first end being in communication with the opening structure, and one sensing unit being arranged in one pipe cavity.

[0008] Further, the at least four opening structures comprise a first opening structure and a second opening structure.

[0009] The sensing unit cover is arranged on the first opening structure, and the connection between the sensing unit and the opening edge of the first opening structure is a sealed connection.

[0010] The second opening structure is provided with a first pipe, the first pipe includes an open first end, a closed second end and a pipe cavity, the first end is communicated with the second opening structure, and one sensing unit is arranged in the pipe cavity.

[0011] Further, the number of the at least one sensing unit is four, and the four sensing units form a Wheatstone bridge structure with the circuit system.

[0012] Further, the pipe includes a first pipe section, a second pipe section and a bent pipe, one end of the bent pipe is connected with the first pipe section, the other end of the bent pipe is connected with the second pipe section, and the first pipe section connection and the second pipe section connection are arranged in parallel.

[0013] Further, the number of the opening structures is four, four opening structures are arranged in the first pipe section or the second pipe section, and one sensing unit is arranged in each of the four opening structures.

[0014] Further, the number of the opening structures is four, two of the four opening structures are arranged in the first pipe section, the other two of the four opening structures are arranged in the second pipe section, and one sensing unit is arranged in each of the four opening structures.

[0015] Further, the number of the opening structures is eight, four of the eight opening structures are arranged in the first pipe section, the other four of the eight opening structures are arranged in the second pipe section, the four opening structures of the first pipe section correspond to the four opening structures of the second pipe section in up-down direction, two opening structures corresponding in up-down direction form one pair of opening structures, and one sensing unit is arranged in each pair of opening structures.

[0016] Further, the distance from each sensing unit to the starting point or the ending point of the pipe is the same.

[0017] According to the technical scheme, the opening structure is arranged on the pipe, the sensing unit is arranged in the opening structure, the sensing unit detects the pressure of the liquid flow in the pipe through the opening structure, and thus neither the sensing unit nor the circuit system is arranged in the pipe, thereby solving the problem that a large-size cavity needs to be arranged at the pressure sensing position in the fine pipe to accommodate the pressure sensor, the cavity destroys the consistency of the pipe, and the pressure detected is inaccurate. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the device for detecting the pressure of the liquid flow in the pipe according to the embodiment of the application.

[0019] Figure 2is another structural schematic view of the device for detecting the pressure of liquid flow in a pipeline provided by the embodiment of the present application.

[0020] Figure 3 is another structural schematic view of the device for detecting the pressure of liquid flow in a pipeline provided by the embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0022] As shown in Figure 1 The embodiment of the present application provides a device for detecting the pressure of liquid flow in a pipeline, which comprises a pipeline 2, a circuit system and at least four sensing units 3, the at least four sensing units 3 are electrically connected with the circuit system, every four sensing units constitute a Venturi bridge structure, the pipeline 2 is provided with at least four opening structures 1, one sensing unit 3 is arranged in each opening structure 1, and the sensing unit 3 detects the pressure of liquid flow in the pipeline 2 through the opening structure 1.

[0023] The opening structure 1 is arranged on the pipeline 2, the sensing unit 3 is arranged in the opening structure 1, and the sensing unit 3 detects the pressure of liquid flow in the pipeline through the opening structure 1, so that neither the sensing unit 3 nor the circuit system is in the pipeline 2, thereby solving the problem that in a fine pipeline, a large-size cavity needs to be made at the pressure sensing part to accommodate the pressure sensor, and the cavity destroys the consistency of the pipeline, thereby causing errors in the detected pressure.

[0024] In the embodiment, every four sensing units constitute a Venturi bridge structure, and each sensing unit is one arm of the Venturi bridge.

[0025] In the embodiment, the sensing unit 3 is a pressure-sensitive resistor.

[0026] In the embodiment, one sensing unit 3 can be arranged in one opening structure 1, or two sensing units 3 can be arranged in two opening structures 1.

[0027] In the embodiment, the pressure of liquid flow in the pipeline 2 is transmitted to the sensing unit 3 through the opening structure 1, so that the sensing unit 3 detects the pressure of liquid flow in the pipeline 2.

[0028] In the embodiment, the sensing unit 3 is covered on the opening structure 1, and the connection between the sensing unit 3 and the opening edge of the opening structure 1 is a sealed connection. By sealing the opening structure 1 with the sensing unit 3, the pressure of the liquid flow in the pipeline 2 is transmitted to the sensing unit 3, and a large-sized cavity does not need to be made, so that neither the sensing unit 3 nor the circuit system is in the pipeline, which can effectively reduce the error caused by the detected pressure.

[0029] In some embodiments, the opening structure 1 is provided with a flexible sealing member, the flexible sealing member seals the opening structure 1, and the sensing unit 3 is attached to the flexible sealing member. By sealing the opening structure 1 with the flexible sealing member, and then attaching the sensing unit 3 to the flexible sealing member, the pressure of the liquid flow in the pipeline 2 is transmitted to the sensing unit 3, and a large-sized cavity does not need to be made, so that neither the sensing unit 3 nor the circuit system is in the pipeline, which can effectively reduce the error caused by the detected pressure.

[0030] Specifically, the flexible sealing member is a film.

[0031] As shown in Figure 2 In some embodiments, the opening structure 1 is provided with a first pipe 4, the first pipe 4 includes an open first end, a closed second end and a pipe cavity, the first end is in communication with the opening structure 1, and one sensing unit 3 is arranged in one pipe cavity. Although the first pipe 4 is arranged in communication with the pipeline 2, the first pipe 4 only needs to accommodate one sensing unit 3, and generally the sensing unit 3 and the circuit system constitute a pressure sensor, so that one sensing unit 3 is much smaller than one pressure sensor, and a large-sized cavity does not need to be made, so that neither the sensing unit 3 nor the circuit system is in the pipeline, which can effectively reduce the error caused by the detected pressure.

[0032] In some embodiments, the at least four opening structures include a first opening structure and a second opening structure; the sensing unit is covered on the first opening structure, and the connection between the sensing unit and the opening edge of the first opening structure is a sealed connection; the second opening structure is provided with a first pipe, the first pipe includes an open first end, a closed second end and a pipe cavity, the first end is in communication with the second opening structure, and one sensing unit is arranged in one pipe cavity. That is, at least one of the at least four opening structures is the first opening structure, and at least one is the second opening structure.

[0033] In the embodiment, the number of the at least one sensing unit 3 is four, and the four sensing units 3 and the circuit system constitute a Wheatstone bridge structure.

[0034] In some embodiments, the pipeline 2 comprises a first pipeline section 21, a second pipeline section 22, and a bent pipeline section 23, one end of the bent pipeline section 23 is connected with the first pipeline section 21, the other end of the bent pipeline section 23 is connected with the second pipeline section 22, the first pipeline section 21 and the second pipeline section 22 are arranged in parallel with each other. Specifically, the first pipeline section 21 and the second pipeline section 22 are both straight pipelines, and the diameters of the first pipeline section 21, the second pipeline section 22, and the bent pipeline section 23 are all the same size.

[0035] In some embodiments, the pipeline 2 is a straight pipeline.

[0036] In some embodiments, the pipeline 2 comprises more than three straight pipeline sections and a bent pipeline section 23 arranged between any two straight pipeline sections in sequence. The two straight pipeline sections are arranged in parallel with each other.

[0037] In the present embodiment, the number of the opening structures 1 is four, the four opening structures 1 are arranged in the first pipeline section 21 or the second pipeline section 22, and one sensing unit 3 is arranged in each of the four opening structures 1. That is, the four sensing units 3 are arranged in the first pipeline section 21 or the second pipeline section 22. Since the first pipeline section 21 or the second pipeline section 22 is a straight pipeline, the four sensing units 3 are arranged in the straight pipeline to detect the pressure of the liquid flow in the pipeline 2. The flow rate of the straight pipeline is more stable than that of the bent pipeline section 23, and the detected pressure is more accurate.

[0038] In some embodiments, the number of the opening structures 1 is four, two of the four opening structures 1 are arranged in the first pipeline section 21, and the other two of the four opening structures 1 are arranged in the second pipeline section 22. One sensing unit 3 is arranged in each of the four opening structures 1. That is, two sensing units 3 are arranged in the first pipeline section 21 or the second pipeline section 22. Since the first pipeline section 21 or the second pipeline section 22 is a straight pipeline, the four sensing units 3 are arranged in the straight pipeline to detect the pressure of the liquid flow in the pipeline. The flow rate of the straight pipeline is more stable than that of the bent pipeline section 23, and the detected pressure is more accurate.

[0039] As Figure 3As shown, in some embodiments, the number of the opening structures 1 is eight, four of the eight opening structures 1 are arranged on the first section of the pipeline 21, and the other four of the eight opening structures 1 are arranged on the second section of the pipeline 22. The four opening structures 1 of the first section of the pipeline 21 correspond to the four opening structures 1 of the second section of the pipeline 22 in an up-down manner. Two opening structures 1 corresponding in an up-down manner form a pair of opening structures 1, and one sensing unit 3 is arranged in each pair of opening structures 1. One sensing unit 3 is arranged in the first section of the pipeline 21 and the second section of the pipeline 22, that is, one sensing unit 3 is arranged in the two sections of the pipeline, and the first section of the pipeline 21 and the second section of the pipeline 22 will flow through each sensing unit 3, that is, the upstream and downstream of the pipeline 2 will flow through each sensing unit 3, so that the detected pressure is more accurate.

[0040] In some embodiments, each sensing unit is arranged at two positions of the pipeline, and the sum of the distances from the two positions to the starting point or the ending point of the pipeline is the same. That is, the distance between each adjacent two pairs of opening structures 1 is the same. The four sensing units 3 are uniformly distributed, and the upstream and downstream of the pipeline will flow through each sensing unit 3, and the number of times of going back and forth is the same. The sum of the distances from each position of the pipeline flowing through the sensing unit 3 to the starting point or the ending point of the pipeline is the same, that is, the pressure detected by each sensing unit 3 in the pipeline is basically the same.

[0041] In the present embodiment, the pipeline is a fine pipeline. Specifically, the pipeline is a pipeline in the sub-millimeter size range, that is, a pipeline in the range of 0.1 to 1 millimeter.

[0042] The above only describes the preferred embodiments of the present application and should not be used to limit the present application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for detecting the pressure of liquid flow in a pipeline, characterized in that, The device includes a pipe, a circuit system, and at least four sensing units. The at least four sensing units are electrically connected to the circuit system. Each group of four sensing units forms a Venturi bridge structure. The pipe is provided with the at least four opening structures. Each opening structure is equipped with a sensing unit. The sensing unit detects the pressure of the liquid flow in the pipe through the opening structure. The pipeline includes a first section of pipeline, a second section of pipeline, and a bent section of pipeline. One end of the bent section of pipeline is connected to the first section of pipeline, and the other end of the bent section of pipeline is connected to the second section of pipeline. The first section of pipeline and the second section of pipeline are arranged parallel to each other. The number of opening structures is eight. Four of the eight opening structures are located in the first section of the pipe, and the other four opening structures are located in the second section of the pipe. The four opening structures in the first section of the pipe and the four opening structures in the second section of the pipe are vertically corresponding. Two vertically corresponding opening structures form a pair of opening structures, and a sensing unit is deployed in each pair of opening structures. The sum of the distances from each sensing unit at its two locations on the pipeline to either the starting point or the end point of the pipeline is the same.

2. The device for detecting liquid flow pressure in a pipeline according to claim 1, characterized in that, The sensing unit is disposed on the opening structure, and the connection between the sensing unit and the edge of the opening structure is a sealed connection.

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