CN214465267U - Non-intrusive hydraulic system flow detection device - Google Patents
Non-intrusive hydraulic system flow detection device Download PDFInfo
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- CN214465267U CN214465267U CN202120558581.6U CN202120558581U CN214465267U CN 214465267 U CN214465267 U CN 214465267U CN 202120558581 U CN202120558581 U CN 202120558581U CN 214465267 U CN214465267 U CN 214465267U
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Abstract
The utility model provides a non-intrusive hydraulic system flow detection device, which comprises a flow calibration system, a temperature regulation system and a measurement system; the measuring system is used for measuring the flow of the measured pipeline; the flow calibration system comprises a hydraulic pump, a stop valve A, a flowmeter, a flow cartridge valve and a pipeline to be measured which are sequentially connected along a hydraulic pipeline; the temperature regulation system comprises a heating loop, a cooling loop and a heat exchanger; the hydraulic oil in the tested pipeline returns to the oil tank through the heat exchanger; the heating loop is used for heating hydraulic oil in the oil tank; the cooling loop is connected with the heat exchanger; the measuring system comprises two ultrasonic transducers; the ultrasonic transducer is arranged on the outer wall of the measured pipeline. The utility model discloses carry out flow calibration earlier before measurement system tests, guaranteed the accuracy of test result, the measurement system who adopts ultrasonic transducer to constitute measures the flow of being surveyed the pipeline, need not to reserve the detection interface, can realize flow detection, and easy operation is swift, and the precision is high.
Description
Technical Field
The utility model relates to a hydraulic system technical field, concretely relates to non-intrusive hydraulic system flow detection device.
Background
With the continuous development of industrial technology, hydraulic systems and devices are developed in the direction of high pressure, high power, high precision and large capacity, the composition and structure of the hydraulic systems and devices become more and more complex, and meanwhile, the loss caused by system failure also increases, so how to improve the reliability of the complex hydraulic systems has become an important research content at present. In order to improve the reliability, the transmission of the hydraulic system needs to be detected in real time, and all elements and liquid in the hydraulic system work in a closed space, so that certain difficulty is brought to the real-time detection of the system.
The flow rate is one of the important parameters of the hydraulic system, and the size of the flow rate directly reflects the operating condition of the hydraulic system. The non-intrusive flow detection is carried out on the hydraulic system, and the non-contact detection of the liquid flow of a plurality of temporary positions of the system can be conveniently realized on the premise of not increasing the complexity of the hydraulic system and not influencing the hydraulic working condition.
In view of the above, there is a need for a non-intrusive hydraulic system flow detection device to solve the problems in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a non-intrusive hydraulic system flow detection device to solve hydraulic system flow detection's problem.
In order to achieve the above object, the utility model provides a non-intrusive hydraulic system flow detection device, which comprises a flow calibration system, a temperature regulation system and a measurement system; the temperature adjusting system is communicated with a hydraulic pipeline of the flow calibration system; the measuring system is used for measuring the flow of the measured pipeline;
the flow calibration system comprises a hydraulic pump, a stop valve A, a flowmeter, a flow cartridge valve and a pipeline to be measured which are sequentially connected along a hydraulic pipeline;
the temperature regulating system comprises a heating loop, a cooling loop and a heat exchanger; the hydraulic oil in the tested pipeline returns to the oil tank through the heat exchanger; the heating loop is used for heating hydraulic oil in the oil tank; the cooling loop is connected with the heat exchanger;
the measuring system comprises two ultrasonic transducers; the ultrasonic transducer is arranged on the outer wall of the measured pipeline; the two ultrasonic transducers are arranged at intervals along the length direction of the pipeline to be measured.
Further, the heating circuit comprises a heating oil pump, a solenoid valve A and a safety valve; an oil outlet of the heating oil pump is communicated with an oil inlet of the electromagnetic valve A; an oil outlet of the electromagnetic valve A returns oil to an oil tank; the safety valve is arranged between the heating oil pump and the electromagnetic valve A;
further, the cooling water loop comprises a cooling water pump, a stop valve B, an electromagnetic valve C and a one-way valve; the water outlet of the cooling water pump is communicated with the water inlet of the stop valve B; the water outlet of the stop valve B is respectively communicated with the water inlets of the electromagnetic valve B and the electromagnetic valve C, the water outlet of the electromagnetic valve B is communicated with the heat exchanger, and the water outlet of the electromagnetic valve C returns water to the cooling water tank; the one-way valve is arranged between the water outlets of the solenoid valve B and the solenoid valve C.
Further, a filter is arranged between the pipeline to be measured and the heat exchanger.
Further, the ultrasonic transducer is arranged on the outer wall of the measured pipeline in a V shape.
Use the technical scheme of the utility model, following beneficial effect has:
(1) the utility model discloses in, adopted the flow calibration system, carried out the flow calibration before measurement system tests, guaranteed the accuracy of test result.
(2) The utility model discloses a measurement system that ultrasonic transducer constitutes measures the flow of being surveyed the pipeline, is a non-intrusive hydraulic detection method, need not to reserve the detection interface, also need not to contact with being surveyed the pipeline, can realize the detection of flow, and it has overcome traditional intrusive detection method and has increased the shortcoming of hydraulic system complexity.
(3) The utility model discloses in, adopted the high accuracy hydraulic oil temperature regulation system who comprises heating circuit and cooling water return circuit, can be with temperature error steerable 1 ℃. The flow detection of the hydraulic system under different temperature conditions can be met.
(4) The utility model relates to a non-intervention formula hydraulic system flow detection device, to the influence of the type of the material of temperature, pipeline and hydraulic oil to the testing result, set up the type of different temperature, different pipeline material and different hydraulic oil, mark detecting system, in the actual test, only need the material type and the hydraulic oil type of input temperature value, pipeline, just can detect flow value under current condition to it is more accurate to make the result.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a schematic diagram of a non-intrusive hydraulic system flow detection device;
FIG. 2 is a schematic flow measurement diagram;
the system comprises a hydraulic pump 1, a stop valve A, a stop valve 3, a flowmeter 4, a flow cartridge valve 5, a pipeline to be detected 6, an ultrasonic transducer 7, a heating oil pump 8, an electromagnetic valve A, a safety valve 10, an oil tank 11, a heat exchanger 12, a cooling water pump 13, a stop valve B, a stop valve 14, an electromagnetic valve B, a solenoid valve 15, an electromagnetic valve C, a solenoid valve 16, a one-way valve 17, a cooling water tank 18 and a filter.
Detailed Description
The embodiments of the invention will be described in detail hereinafter with reference to the accompanying drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Example 1:
referring to fig. 1 to 2, a non-intrusive hydraulic system flow detection device includes a flow calibration system, a temperature adjustment system and a measurement system; the temperature adjusting system is communicated with a hydraulic pipeline of the flow calibration system; the measuring system is used for measuring the flow of the measured pipeline 5;
the flow calibration system comprises a hydraulic pump 1, a stop valve A2, a flowmeter 3, a flow cartridge valve 4 and a measured pipeline 5 which are sequentially connected along a hydraulic pipeline; in this embodiment, the pipeline 5 to be measured is preferably a hydraulic steel pipe.
The temperature regulation system comprises a heating loop, a cooling loop and a heat exchanger 11; the hydraulic oil in the tested pipeline returns to the oil tank through the heat exchanger 11; the heating loop is used for heating hydraulic oil in the oil tank; the cooling loop is connected with the heat exchanger 11;
the measuring system comprises two ultrasonic transducers 6; the ultrasonic transducer 6 is arranged on the outer wall of the measured pipeline 5; the two ultrasonic transducers are arranged at intervals along the length direction of the pipeline to be measured.
The heating loop comprises a heating oil pump 7, a solenoid valve A8 and a safety valve 9; an oil outlet of the heating oil pump 7 is communicated with an oil inlet of the electromagnetic valve A8; the oil outlet of the electromagnetic valve A8 returns oil to the oil tank 10; the relief valve 9 is provided between the heating oil pump 7 and the electromagnetic valve A8;
the cooling water loop comprises a cooling water pump 12, a stop valve B13, a solenoid valve B14, a solenoid valve C15 and a one-way valve 16; the water outlet of the cooling water pump 12 is communicated with the water inlet of the stop valve B13; the water outlet of the stop valve B13 is respectively communicated with the water inlets of the electromagnetic valve B14 and the electromagnetic valve C15, the water outlet of the electromagnetic valve B14 is communicated with the heat exchanger 11, and the water outlet of the electromagnetic valve C15 returns water to the cooling water tank 17; check valve 16 is disposed between the outlet of solenoid valve B14 and solenoid valve C15.
A filter 18 is arranged between the measured pipeline 5 and the heat exchanger 11.
The ultrasonic transducer 6 is arranged on the outer wall of the measured pipeline 5 in a V shape.
The working principle of the non-intrusive hydraulic system flow detection device is as follows:
the embodiment relates to a method for increasing the propagation of ultrasonic waves in a fluid by adopting a time difference method and adopting an external V-shaped mounting mode for a pair of ultrasonic transducers. The measuring schematic diagram is shown in fig. 2:
in fig. 2, TRA and TRB are ultrasonic transducers, D is the outer diameter of the measured pipeline, D is the inner diameter of the measured pipeline, and L is the distance between the front end faces of the ultrasonic transducers; theta0For the angle of incidence of the ultrasonic waves, θ1Is the angle of refraction, theta, of the ultrasonic waves in the pipe under test2Is the angle of refraction of the ultrasonic waves in the fluid.
In the measurement scheme of fig. 2, the ultrasonic transducers TRA and TRB will simultaneously transmit ultrasonic pulses and simultaneously receive ultrasonic signals transmitted by each other under the action of the control circuit. The K value of the ultrasonic transducer determines the incident angle theta of the ultrasonic signal0Will determine θ, and the pipe material and the value of K will determine θ together1Size of (a pipe lining is not present), θ2Will be determined by the pipe material and the type of fluid being measured.
After ultrasonic signal is transmitted, the angle theta is0Through the transducer wedge, after refraction at the transducer interface, the ultrasonic wave is at θ1Is passed through the wall of the tube, a second refraction occurs at the interface of the tube wall and the fluid being measured, after which the ultrasonic signal is reflected at θ2The ultrasonic signals are reflected by the opposite inner side of the pipe wall through the measured fluid, and enter the other transducer in the reverse order (assuming that a pair of ultrasonic transducers has good consistency and the installation position is in a perfect ideal state).
Let the sound velocity of the ultrasonic signal in the measured fluid be C0In the pipe wall, the speed of sound is C1If the time required from TRA to TRB in the case of the ultrasonic downstream is t1The time required from TRB to TRA in the case of reverse flow is t2Simultaneously order
Then the formula (1) and the formula (2) are provided;
in the formula: tau is1，τ2Delaying the ultrasonic transducer wedge and the circuit;
for equations (1) and (2), let us assume that the ultrasonic transducer wedge and the circuit delay have better consistency, so that τ can be approximated1，τ2Equation (1) is subtracted from equation (2) to yield the equivalent:
namely, formula (3)
In general industrial measurements, the flow rate of the liquid is often several meters per second, while the propagation velocity of the acoustic wave in the liquid is about 1500 meters per second, so v in formula (3)2sin2θ2The term can be ignored, so that the error brought to the system is not more than 10-4Even in a 0.5-level or 1-level table, the omission of this entry does not affect the accuracy of the entire table. In view of this, formula (3) is further simplified to give formula (4):
in the formula L3Can be represented by the outer diameter D and the inner diameter D of the measured pipeline, and the front edge of the ultrasonic transducer is set to be Le(the size of the leading edge of the transducer is an important parameter of the transducer), and the distance between the front end faces when the transducer is installed is L (as shown in FIG. 2), the following formula (5):
conversion of the formula (5) to give (6)
From the equation (6), in an ideal state, the flow velocity is only equal to the inner diameter of the measured pipeline, the sound velocity of the ultrasonic wave in the measured fluid, and the refraction angle of the ultrasonic wave signal from the pipe wall to the measured fluid. When the formula (6) is used for calculating the flow velocity, an ideal precondition is that the error of the distance L of the front end face is within the measurement allowable range when the transducer is installed, and if the deviation of L is too large, the measurement result is greatly influenced.
Correcting the linear flow velocity calculated by the formula (6) to obtain the surface flow velocity:
νA＝ην
in the formula: eta is correction coefficient of surface velocity to linear velocity
The flow through the pipe to be tested is (7):
(7) the flow volume formula calculated by the formula is obtained on the premise of perfect measurement, and in order to obtain a true flow volume value, further correction needs to be carried out on Q, so that the formula (8) is obtained:
the flow velocity, the flow volume and the sound velocity can be obtained from the flow velocity calculation formula (6)
Proportional to the sound velocity, the sound velocity varies with the temperature, and the error caused by the temperature variation is relatively large and must be corrected.
When the temperature is T, the sound velocity of the measured medium is expressed by the formula (9):
C＝C0(1+bT) (9)
in the formula: c0Is T0Is the sound velocity value at 0 ℃; and b is the sound velocity temperature coefficient of the measured medium.
Before testing, the measuring system is calibrated, the flow of the flow calibration system is adjusted through the plug-in flow valve, reading is carried out through the flowmeter, and then the flow of the flow calibration system is measured through the portable testing system and is compared with the reading of the flowmeter.
The flow calibration system is connected with a temperature regulation system, the temperature of the tested hydraulic oil can be controlled to be +/-1 ℃, and the test result and the result of the flow calibration system are compared at different temperatures, so that the flow values at different temperatures can be calculated. In the actual test, the sound speed value at the actual temperature, θ, is input2Will be determined by the pipe material and the type of fluid being measured.
In order to make the detection result more accurate, in the flow calibration system, the pipelines made of different materials and the types of the hydraulic oil are replaced, the detection result and the result of the flow calibration system are used, and therefore theta of the pipelines made of different materials and the hydraulic oil is calculated2Therefore, the detection result is more accurate.
The utility model relates to a non-intervention formula hydraulic system flow detection device, to the influence of the type of the material of temperature, pipeline and hydraulic oil to the testing result, set up the type of different temperature, different pipeline material and different hydraulic oil, mark detecting system, in the actual test, only need the material type and the hydraulic oil type of input temperature value, pipeline, just can detect flow value under current condition to it is more accurate to make the result.
The utility model discloses non-intrusive hydraulic pressure detection method has overcome traditional intrusive detection method and has increased the shortcoming of hydraulic system complexity, need not to reserve the detection interface, can realize flow detection.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A flow detection device of a non-intrusive hydraulic system is characterized by comprising a flow calibration system, a temperature regulation system and a measurement system; the temperature adjusting system is communicated with a hydraulic pipeline of the flow calibration system; the measuring system is used for measuring the flow of the measured pipeline (5);
the flow calibration system comprises a hydraulic pump (1), a stop valve A (2), a flowmeter (3), a flow cartridge valve (4) and a pipeline to be measured (5) which are sequentially connected along a hydraulic pipeline;
the temperature regulation system comprises a heating circuit, a cooling circuit and a heat exchanger (11); the hydraulic oil in the tested pipeline returns to the oil tank through the heat exchanger (11); the heating loop is used for heating hydraulic oil in the oil tank; the cooling loop is connected with the heat exchanger (11);
the measuring system comprises two ultrasonic transducers (6); the ultrasonic transducer (6) is arranged on the outer wall of the measured pipeline (5); the two ultrasonic transducers are arranged at intervals along the length direction of the pipeline to be measured.
2. The non-intrusive hydraulic system flow detection device of claim 1, wherein the heating circuit includes a heating oil pump (7), a solenoid valve a (8), and a relief valve (9); an oil outlet of the heating oil pump (7) is communicated with an oil inlet of the electromagnetic valve A (8); an oil outlet of the electromagnetic valve A (8) returns oil to an oil tank (10); the safety valve (9) is arranged between the heating oil pump (7) and the electromagnetic valve A (8).
3. The non-intrusive hydraulic system flow detection device of claim 2, wherein the cooling water circuit includes a cooling water pump (12), a shutoff valve B (13), a solenoid valve B (14), a solenoid valve C (15), and a check valve (16); the water outlet of the cooling water pump (12) is communicated with the water inlet of the stop valve B (13); the water outlet of the stop valve B (13) is respectively communicated with the water inlets of the electromagnetic valve B (14) and the electromagnetic valve C (15), the water outlet of the electromagnetic valve B (14) is communicated with the heat exchanger (11), and the water outlet of the electromagnetic valve C (15) returns water to the cooling water tank (17); the one-way valve (16) is arranged between the water outlets of the electromagnetic valve B (14) and the electromagnetic valve C (15).
4. A non-intrusive hydraulic system flow detection device as defined in any one of claims 1 to 3, wherein a filter (18) is provided between the pipe (5) under test and the heat exchanger (11).
5. The non-intrusive hydraulic system flow detection device as defined in claim 1, wherein said ultrasonic transducer (6) is installed in a V-shape on the outer wall of the pipe (5) to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120558581.6U CN214465267U (en) | 2021-03-18 | 2021-03-18 | Non-intrusive hydraulic system flow detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120558581.6U CN214465267U (en) | 2021-03-18 | 2021-03-18 | Non-intrusive hydraulic system flow detection device |
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| Publication Number | Publication Date |
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| CN214465267U true CN214465267U (en) | 2021-10-22 |
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| CN202120558581.6U Expired - Fee Related CN214465267U (en) | 2021-03-18 | 2021-03-18 | Non-intrusive hydraulic system flow detection device |
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- 2021-03-18 CN CN202120558581.6U patent/CN214465267U/en not_active Expired - Fee Related
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Granted publication date: 20211022 |