KR-20260064738-A - Method for detecting foreign objects in fluid flow, vortex flowmeter measurement system, and heat pump heating system

Abstract

The present invention relates to a method for detecting foreign entities (E), in particular bubbles or particulate solids, in a fluid flow (F), the method being performed using a vortex flow meter measuring system (1) having a vortex sensor (11), and at least the following method steps are performed: A step of continuously detecting a measurement signal (S) using a vortex sensor (11), A step of determining the actual value of at least one measurement variable dependent on a measurement signal (S) - said measurement variable is sensitive to extraneous entities (E) accompanying within the fluid flow (F) -, A step of determining the deviation of the actual value from the set value - said set value characterizes the fluid flow (F) without external entities (E) -, and A step of determining and outputting an indicator signal (I) as a measure of the concentration of extraterrestrial entities (E) accompanying the fluid flow (F) based on the deviation of the actual value.

Inventors

• 슈트라우브, 안드레아스
• 프리드리히스, 르네
• 빌케, 바스티안

Assignees

• 시카 독토어 시베르트 운트 쿤 게엠베하 운트 체오. 카게

Dates

Publication Date

20260507

Application Date

20241010

Priority Date

20231011

Claims (10)

1. A method for detecting foreign entities (E), particularly bubbles or particulate solids, within a fluid flow (F), The above method is performed using a vortex flow meter measuring system (1) having a vortex sensor (11), and at least the following method steps: A step of continuously detecting a measurement signal (S) using the above vortex sensor (11), A step of determining the actual value of at least one measurement variable dependent on the above measurement signal (S) - the measurement variable is sensitive to external entities (E) accompanying within the fluid flow (F) -, A step of determining the deviation of the above actual value from the set value - the above set value characterizes the fluid flow (F) without external entities (E) - and The method is characterized by performing the step of determining and outputting an indicator signal (I) as a measure of the concentration of extraterrestrial entities (E) accompanying the fluid flow (F) based on the deviation of the actual value above. method.
2. In paragraph 1, A method characterized in that at least one measurement variable is formed from frequency information and/or amplitude information of the measurement signal (S).
3. In paragraph 1 or 2, A method characterized in that at least one measurement variable is formed as the number of supercritical deviations per unit time from the average value of the frequency and/or amplitude of the measurement signal (S).
4. In any one of paragraphs 1 through 3, A method characterized in that at least one measurement variable is selected as a function of the flow rate of the fluid flow (F).
5. In any one of paragraphs 1 through 4, A method characterized in that, when detecting the above measurement signal (S), the sampling rate and/or signal amplification is adapted to the flow rate of the above fluid flow (F).
6. In any one of paragraphs 1 through 5, A method characterized in that, when detecting the above measurement signal (S), the sampling rate is in the range of 1 kHz to 20 kHz, particularly in the range of 2 kHz to 8 kHz.
7. In any one of paragraphs 1 through 6, A method characterized in that the validity of the above-mentioned instruction signal (I) is continuously evaluated and a corresponding validity signal (V) is output.
8. In Paragraph 7, A method characterized in that the validity of the above-mentioned indicator signal (I) is evaluated based on the flow rate of the above-mentioned fluid flow (F), and changes in the flow rate cause a decrease in validity.
9. As a vortex flow meter measurement system (1) having a vortex sensor (11), an evaluation unit (12), and an output unit (13), The above vortex flow meter measuring system (1) is designed to perform a method for detecting foreign entities (E) in a fluid flow (F) according to any one of claims 1 to 8, the evaluation unit (12) is designed to determine the indication signal (I), and the output unit (13) is designed to output the indication signal (I). Vortex flow meter measurement system.
10. A heat pump heating system (100) comprising an operating circuit (2) having a refrigerant, a heating circuit (3) having heating water, and a heat exchanger (4), wherein the operating circuit (2) and the heating circuit (3) are in a state of heat contact using the heat exchanger (4). The heating circuit (3) is characterized by having a vortex flow meter measuring system (1) according to claim 9 and being designed to detect the refrigerant in the heating water. Heat pump heating system

Description

Method for detecting foreign objects in fluid flow, vortex flowmeter measurement system, and heat pump heating system The present invention relates to a method for detecting foreign entities in a fluid flow, particularly bubbles or foreign particles, using a vortex flow meter measuring system, and to a vortex flow meter measuring system designed to correspond thereto and a heat pump heating system equipped with the same. One aspect of monitoring fluid flow in pipelines relates to the detection of associated foreign entities, such as particulate solids or bubbles, within the flowing liquid. For process control, it is desirable to know the occurrence and concentration of such foreign entities, especially in processes with high hygiene requirements, such as the food processing industry, where they are classified as contaminants. Another application is leakage in the fluid circuit of a heat pump heating system, where gaseous refrigerant may enter the heating water circuit and potentially cause an explosion. For example, Publication WO 2006/088423 A1 discloses a method for detecting foreign bodies in a medium based on testing using microwave and ultrasonic irradiation. Additionally, Publication DE 10 2021 128 381 A1 discloses a method for detecting an alien body in a fluid medium within a pipeline, wherein an appropriate measurement of the dielectric constant of the medium is performed using an electrode or antenna arranged therein. Further measures for improving the present invention are described in more detail below, together with the description of embodiments of the present invention based on the drawings. The drawings are schematically: FIG. 1: Vortex flow meter measuring system according to the present invention, Fig. 2: Exemplary signal curves, and FIG. 3: A heat pump heating system according to the present invention is illustrated. FIG. 1 illustrates a schematic cross-sectional view of a vortex flow meter measuring system (1) according to the present invention designed to perform a method according to the present invention for detecting an external entity E within a fluid flow F. The vortex flow meter measuring system (1) comprises a measuring tube (15) in which a prismatic obstacle (14) is arranged, and a vortex sensor (11) arranged downstream of the obstacle (14). The presence of the disturbance body (14) within the fluid flow F induces the formation of an illustrated Karman vortex path consisting of a reverse-rotating and offset vortex W, which can be measured as an alternating pressure fluctuation at the vortex sensor (11). An alien entity E accompanying the fluid flow F, illustrated herein as a bubble, has a characteristic effect on the formation of a Karman vortex path, and the method according to the present invention is based on the identification and evaluation of this effect in the measurement signal of the vortex sensor (11). To this end, an evaluation unit (12) receives a measurement signal continuously recorded from the vortex sensor (11), determines an indication signal to be output therefrom, that is, determines the actual value of at least one measurement variable under consideration and the deviation from the corresponding set value, and determines the indication signal as a measure of the concentration of the alien entity E accompanying the fluid flow F based on the determined deviation. The indication signal and, preferably, the validity signal also continuously determined by the evaluation unit (12), can be output by an output unit (13), and in particular, can be output as continuous voltage signals. FIG. 2 illustrates exemplary signal curves during the implementation of the method according to the present invention, namely the time curve of the measurement signal S from the vortex sensor and the associated indication signal I and validity signal V. The signal curves include four different flow states Z0-Z3, which differ in terms of the concentration of each alien entity and the flow rate of the fluid flow being monitored, according to the specifications of Table 1. fluid stateConcentration of alien speciesFluid flow rateZ 0doesn't existConsistencyZ 1heightConsistencyZ 2heightincreaseZ 3lownessConsistency The measurement signal S in flow state Z0, i.e., a fluid flow of constant flow rate without accompanying external entities, is essentially formed by a sinusoidal signal, and at this time, two vortices flowing through the vortex sensor per cycle duration are detected. In flow states Z1-Z3, when accompanying external entities are present, the measurement signal S is significantly modified and exhibits a much more structured frequency spectrum. The measurement variables considered for the detection of foreign entities are formed particularly from frequency information and/or amplitude information of the measurement signal S, and the evaluation of the measurement signal S is performed over several cycles of the fundamental frequency to determine each actual value. In this embodiment, th