Device and method for monitoring residual fatigue life of energy accumulator

Abstract

The invention relates to the technical field of energy accumulators, in particular to an energy accumulator residual fatigue life monitoring device and method. The monitoring device comprises an acquisition system, an analysis system and an early warning system. The acquisition system is used for acquiring parameters at a liquid phase inlet and a liquid phase outlet of the energy accumulator; the analysis system is used for receiving the parameters acquired by the acquisition system, and the analysis system processes the received parameters and then transmits signals to the early warning system; the early warning system is used for grading the input data and then carrying out grading alarm processing. The energy accumulator residual fatigue life monitoring device and the energy accumulator residual fatigue life monitoring method can achieve the purpose of monitoring the energy accumulator residual fatigue life, and have the functions of real-time monitoring and early warning in advance. Meanwhile, the accident rate can be reduced, and long-term safe operation of the energy accumulator is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of accumulators, and in particular to a device and method for monitoring the remaining fatigue life of an accumulator. Background Art

[0002] With the vigorous development of society, problems such as energy depletion, environmental pollution, and climate change are becoming increasingly prominent. Energy conservation and energy storage have become a consensus for the development of all countries. As an energy storage and energy-saving device, accumulators can reduce system impact and pressure pulsation for hydraulic systems with intermittent operation or large changes in working pressure, ensure the normal operation of the hydraulic system, improve its dynamic quality, extend its service life, and reduce noise. They are indispensable components of modern hydraulic systems, and their performance directly determines the quality of the hydraulic system performance.

[0003] Accumulators are fixed pressure vessels. In TSG 21-2016 "Regulations on Safety Technical Supervision of Fixed Pressure Vessels", the pressure shell of accumulators is managed by "name classification", that is, for any product called "accumulator", its pressure shell only needs to comply with the general, design and manufacturing requirements in the regulations. The pressure shell of the accumulator does not need to be registered for use, and does not need to be inspected regularly within the design life. The user unit is responsible for its safety management during service. With the advancement of construction technology and the expansion of application demand areas, many new, high-pressure, and large-volume accumulators continue to appear. Some accumulators have already belonged to Class III pressure vessels, and the safety risks have increased, bringing great pressure and challenges to the safe operation of the equipment. Because accumulators are subjected to high-frequency cyclic alternating loads, fatigue damage and wear are the main damage modes of accumulators in service, especially the accumulator liquid inlet and outlet positions are more prone to fatigue damage. Since regular inspection is not required, after long-term service, the user unit cannot accurately obtain the safety status and remaining fatigue life of the accumulator, which brings hidden dangers to safe use. Once an accident occurs, it is easy to cause personal injury and property loss. Therefore, there is an urgent need for a technology or solution for monitoring the remaining fatigue life of the accumulator. Summary of the invention

[0004] The first object of the present invention is to provide an accumulator remaining fatigue life monitoring device, which can solve the problems existing in the prior art;

[0005] The second object of the present invention is to provide a method for monitoring the remaining fatigue life of an accumulator, using the remaining fatigue life monitoring device for an accumulator as described above to monitor the remaining fatigue life of the accumulator.

[0006] The present invention provides an accumulator remaining fatigue life monitoring device, which includes a collection system, an analysis system and an early warning system;

[0007] The acquisition system is used to collect parameters at the liquid inlet and outlet of the accumulator;

[0008] The analysis system is used to receive the parameters collected by the collection system, and the analysis system processes the received parameters and transmits the signals to the early warning system;

[0009] The early warning system is used to classify input data and then perform graded alarm processing.

[0010] Preferably, the collection system is connected to the energy accumulator via a connection system.

[0011] Preferably, the connection system comprises a tee;

[0012] The tee is arranged on the connecting pipe of the pressure gauge at the liquid phase end of the accumulator, and the collection system is connected to an interface of the tee.

[0013] Preferably, the acquisition system includes a sensor and a signal transmitter;

[0014] The sensor is used to measure the real-time parameters of the gas phase space of the accumulator, and the signal transmitter is used to transmit the measured parameter values ​​to the analysis system.

[0015] Preferably, the acquisition system includes a plurality of sensors, and the plurality of sensors are used to acquire the pressure, temperature and loading rate at the liquid inlet and outlet of the accumulator.

[0016] Preferably, the analysis system comprises a logic controller, a counter and a signal transmitter;

[0017] The logic controller is used to determine whether the measured parameter value meets the set conditions, the counter is used to count the number of times the set conditions are met, and the signal transmitter is used to transmit the counter value to the early warning system.

[0018] Preferably, the early warning system is composed of a controller, a signal transmitter and an external control module;

[0019] The controller is used to classify the transmitted data and transmit it to the external control module according to different levels.

[0020] A method for monitoring the remaining fatigue life of an accumulator, which uses the above-mentioned device for monitoring the remaining fatigue life of an accumulator to monitor the remaining fatigue life of the accumulator, and comprises the following steps:

[0021] The acquisition system acquires the parameters at the inlet and outlet of the liquid phase of the accumulator, and transmits the acquired parameters to the analysis system;

[0022] The analysis system receives the parameters collected by the acquisition system, processes the received parameters and transmits the signals to the early warning system;

[0023] The early warning system will classify the input data and then perform graded alarm processing.

[0024] Preferably, the parameters collected by the collection system include pressure, temperature and loading rate at the liquid inlet and outlet of the accumulator.

[0025] Preferably, the condition criteria set in the analysis system are: taking the cumulative number of various cycle loads of the accumulator during the entire service life as a criterion;

[0026] If the sum of the number of cyclic loads does not reach the number of cycles allowed by the fatigue design curve at a given alternating stress amplitude, it is considered that the accumulator will not fail due to fatigue. The total number of cycles includes the number of alternating pressures the accumulator is subjected to, the number of times the pressure fluctuates by more than 20%, the equivalent number of different loading rates, and the equivalent number of temperature differences.

[0027] Beneficial effects:

[0028] The accumulator remaining fatigue life monitoring device and method can achieve the purpose of monitoring the accumulator remaining fatigue life, and has the functions of real-time monitoring and early warning; at the same time, it can reduce the accident rate and ensure the long-term safe operation of the accumulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of an accumulator remaining fatigue life monitoring device provided in a specific embodiment of the present invention;

[0031] Description of reference numerals:

[0032] 1: Accumulator; 2: Tee; 3: Pressure gauge. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figure 1 As shown, this embodiment provides an accumulator remaining fatigue life monitoring device, which includes a collection system, an analysis system and an early warning system.

[0037] The acquisition system is used to collect parameters at the liquid inlet and outlet of the accumulator 1;

[0038] The analysis system is used to receive the parameters collected by the acquisition system, and the analysis system processes the received parameters and transmits the signals to the early warning system;

[0039] The early warning system is used to classify the input data and then perform graded alarm processing.

[0040] The collection system is connected to the energy storage device 1 via a connection system.

[0041] The connection system comprises a tee 2 .

[0042] The tee 2 is arranged on the connecting pipe of the pressure gauge 3 at the liquid phase end of the accumulator 1 , and the collection system is connected to an interface of the tee 2 .

[0043] Specifically, the connection system is composed of a tee 2, a valve and a connecting pipe, and is connected to the liquid inlet and outlet of the accumulator so as to connect the data acquisition system with the accumulator and measure its related parameters.

[0044] The acquisition system includes sensors and signal transmitters.

[0045] The sensor is used to measure the real-time parameters of the gas phase space of the accumulator, and the signal transmitter is used to transmit the measured parameter values ​​to the analysis system.

[0046] The acquisition system includes a plurality of sensors, and the plurality of sensors are used to acquire the pressure, temperature and loading rate at the liquid inlet and outlet of the accumulator.

[0047] The analysis system includes a logic controller, a counter and a signal transmitter;

[0048] The logic controller is used to determine whether the measured parameter value meets the set conditions, the counter is used to count the number of times the set conditions are met, and the signal transmitter is used to transmit the counter value to the early warning system.

[0049] The early warning system is composed of a controller, a signal transmitter and an external control module;

[0050] The controller is used to classify the transmitted data and transmit it to the external control module according to different levels.

[0051] In this embodiment, a method for monitoring the remaining fatigue life of an accumulator is also provided. The method uses the above-mentioned device for monitoring the remaining fatigue life of the accumulator to monitor the remaining fatigue life of the accumulator, and the method comprises the following steps:

[0052] The acquisition system acquires the parameters at the inlet and outlet of the liquid phase of the accumulator, and transmits the acquired parameters to the analysis system;

[0053] The analysis system receives the parameters collected by the acquisition system, processes the received parameters and transmits the signals to the early warning system;

[0054] The early warning system will classify the input data and then perform graded alarm processing.

[0055] The parameters collected by the acquisition system include the pressure, temperature and loading rate at the inlet and outlet of the accumulator liquid phase.

[0056] The condition criteria set in the analysis system are: the cumulative number of various cycle loads of the accumulator during the entire service life is used as the criterion;

[0057] If the sum of the number of cyclic loads does not reach the number of cycles allowed by the fatigue design curve at a given alternating stress amplitude, it is considered that the accumulator will not fail due to fatigue. The total number of cycles includes the number of alternating pressures the accumulator is subjected to, the number of times the pressure fluctuates by more than 20%, the equivalent number of different loading rates, and the equivalent number of temperature differences.

[0058] This criterion is expressed by the formula:

[0059] N1+N2+N3+N4≤N

[0060] N—The total number of cycles allowed.

[0061] N1—Number of alternating pressure cycles including starting and stopping.

[0062] N2—The number of cycles in which the pressure fluctuation range is greater than or equal to 20% of the working pressure.

[0063] N3—Equivalent times of different loading rates, which is obtained by multiplying the number of alternating pressure cycles by the coefficients listed in Table 1. That is, the higher the loading rate, the higher the equivalent times.

[0064] The function of loading rate can be expressed by an empirical formula:

[0065]

[0066] Where: v is the loading rate of the liquid phase part of the accumulator;

[0067] v0—Base loading rate of the liquid phase part of the accumulator.

[0068] Table 1 Loading rate equivalent coefficient

[0069] Function value of loading rate ≤1 1～2 2～5 5～10 Loading rate equivalent factor 0 1 2 3

[0070] N4—Temperature difference equivalent times, is obtained by multiplying the temperature difference change times by the coefficients listed in Table 2. That is, the higher the temperature difference, the higher the equivalent times.

[0071] Table 2 Temperature equivalent coefficient

[0072] Temperature difference △T / ℃ ≤28 29～56 57～83 Temperature Equivalence Factor 0 1 2

[0073] Note: ΔT=T-T0

[0074] T—Real-time temperature of the accumulator liquid inlet and outlet.

[0075] T0—Accumulator liquid phase operating temperature.

[0076] The early warning system has three levels of warning: blue warning, yellow warning and red warning. The warning criteria are as follows:

[0077] (1) When When the vehicle is in blue warning mode, the vehicle should be stopped for inspection.

[0078] (2) When When the warning is yellow, the vehicle should be stopped for inspection and fatigue analysis.

[0079] (3) When N1+N2+N3+N4=N, it is a red warning. At this time, the vehicle should be stopped for inspection.

[0080] And conduct evaluation on suitability for use.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An accumulator residual fatigue life monitoring device, characterized in that: Including collection system, analysis system and early warning system; The acquisition system is used to collect parameters at the liquid inlet and outlet of the accumulator; The analysis system is used to receive the parameters collected by the collection system, and the analysis system processes the received parameters and transmits the signals to the early warning system; The early warning system is used to classify input data and then perform graded alarm processing.

2. The accumulator remaining fatigue life monitoring device according to claim 1, characterized in that: The collection system is connected to the energy accumulator via a connection system.

3. The accumulator remaining fatigue life monitoring device according to claim 2, characterized in that: The connection system includes a tee; The tee is arranged on the connecting pipe of the pressure gauge at the liquid phase end of the accumulator, and the collection system is connected to an interface of the tee.

4. The accumulator remaining fatigue life monitoring device according to claim 1, characterized in that: The acquisition system includes a sensor and a signal transmitter; The sensor is used to measure the real-time parameters of the gas phase space of the accumulator, and the signal transmitter is used to transmit the measured parameter values ​​to the analysis system.

5. The accumulator remaining fatigue life monitoring device according to claim 4, characterized in that: The acquisition system includes a plurality of sensors, and the plurality of sensors are used to acquire the pressure, temperature and loading rate at the liquid inlet and outlet of the accumulator.

6. The accumulator remaining fatigue life monitoring device according to claim 1, characterized in that: The analysis system includes a logic controller, a counter and a signal transmitter; The logic controller is used to determine whether the measured parameter value meets the set conditions, the counter is used to count the number of times the set conditions are met, and the signal transmitter is used to transmit the counter value to the early warning system.

7. The accumulator remaining fatigue life monitoring device according to claim 1, characterized in that: The early warning system is composed of a controller, a signal transmitter and an external control module; The controller is used to classify the transmitted data and transmit it to the external control module according to different levels.

8. A method for monitoring the remaining fatigue life of an accumulator, characterized in that: The remaining fatigue life of an accumulator is monitored by using the remaining fatigue life monitoring device of any one of claims 1 to 7, which comprises the following steps: The acquisition system acquires the parameters at the inlet and outlet of the liquid phase of the accumulator, and transmits the acquired parameters to the analysis system; The analysis system receives the parameters collected by the acquisition system, processes the received parameters and transmits the signals to the early warning system; The early warning system will classify the input data and then perform graded alarm processing.

9. The method for monitoring the remaining fatigue life of an accumulator according to claim 8, characterized in that: The parameters collected by the acquisition system include the pressure, temperature and loading rate at the inlet and outlet of the accumulator liquid phase.

10. The method for monitoring the remaining fatigue life of an accumulator according to claim 8, characterized in that: The condition criteria set in the analysis system are: the cumulative number of various cycle loads of the accumulator during the entire service life is used as the criterion; If the sum of the number of cyclic loads does not reach the number of cycles allowed by the fatigue design curve at a given alternating stress amplitude, it is considered that the accumulator will not fail due to fatigue. The total number of cycles includes the number of alternating pressures the accumulator is subjected to, the number of times the pressure fluctuates by more than 20%, the equivalent number of different loading rates, and the equivalent number of temperature differences.

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