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JP-3255719-U - Ultrasonic flowmeter

JP3255719UJP 3255719 UJP3255719 UJP 3255719UJP-3255719-U

Abstract

[Problem] To provide an ultrasonic flow meter that can be easily assembled and allows for the smallest possible flow resistance for the fluid medium flowing through the measuring tube. [Solution] An ultrasonic flow meter 1 has a measuring tube 10 through which a flow space 11 extends, through which a flow medium 20 can flow in the flow direction, a first ultrasonic transducer 12 is installed at a first position, and a second ultrasonic transducer 13 or a reflecting surface is installed at a second position, thereby sending ultrasonic waves into the flow space and receiving the sent ultrasonic waves again by the other ultrasonic transducer or the reflecting surface, respectively, while forming an ultrasonic propagation path 16, an inner wall segment 15 is installed inside the measuring tube, the sent ultrasonic waves strike and reflect off this inner wall segment, and the ultrasonic propagation path has sections perpendicular and lateral to the flow direction. [Selection Diagram] Figure 2

Inventors

  • アルミン・クリスティアン・ヴェルカー
  • ルーカス・オスマー・シュミット
  • バスティアン・ヴィルケ

Assignees

  • ジーカ・ドクトル・ジーベルト・ウント・キューン・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング・ウント・コンパニー・コマンデイトゲゼルシャフト

Dates

Publication Date
20260507
Application Date
20251128
Priority Date
20241129

Claims (14)

  1. An ultrasonic flow meter (1) comprising a measuring tube (10), through which a flow space (11) extends, through which a flow medium (20) can flow in at least one flow direction (111), a first ultrasonic transducer (12) is installed at a first position (I), and at least one second ultrasonic transducer (13) or at least one reflecting surface is installed at a second position (II), thereby sending ultrasonic waves (14) into the flow space (11) and receiving the sent ultrasonic waves (14) again by the other ultrasonic transducers (12, 13) or reflecting surface, respectively, forming an ultrasonic propagation path (16), and an inner wall segment (15) is installed inside the measuring tube (10), to which the sent ultrasonic waves (14) strike and are reflected, in an ultrasonic flow meter, An ultrasonic flow meter (1) characterized in that the ultrasonic propagation path (16) has sections perpendicular (16a) and lateral (16b) to the flow direction (111).
  2. The ultrasonic flow meter (1) according to claim 1, characterized in that the ultrasonic propagation path (16) is formed in an M-shape, the inner "V-shaped" section of the M-shape is formed to extend diagonally with respect to the flow direction (111), and the outer "I-shaped" section of the M-shape is formed to extend perpendicularly with respect to the flow direction (111).
  3. The ultrasonic flowmeter (1) according to claim 1 or 2, characterized in that at least one or more inner wall segments (15) form a cavity (17), the cavity (17) is at least partially or completely covered by shape-coupled cover surfaces (18, 19) for separation of the fluid in the flow space (11) from the ultrasonic transducers (12, 13), and each of the cavity (17) has a single spatial volume (21) that is fluid-technically separated from the flow space (11).
  4. The ultrasonic flowmeter (1) according to any one of claims 1 to 3, characterized in that the cover surfaces (18, 19) are formed from a membrane (22), and the membrane (22) allows the spatial volume portion (21) of the cavity (17) to be filled with a flow medium (20) that flows through the flow space (11).
  5. The ultrasonic flowmeter (1) according to any one of claims 1 to 4, characterized in that the membrane (22) forms a planar body having an opening and/or a perforated surface and/or is formed in a sieve shape.
  6. An ultrasonic flowmeter (1) according to any one of claims 1 to 5, characterized in that at least one small tube is installed, and each small tube connects the spatial volume section (21) to the flow medium (20) inside the tube.
  7. The ultrasonic flow meter (1) according to any one of claims 1 to 6, characterized in that the spatial volume portion (21) is filled with a sealing compound (24), and the cover surfaces (28, 29) are formed from the sealing compound (24).
  8. The ultrasonic flowmeter (1) according to any one of claims 1 to 7, characterized in that the sealing compound (24) has the same or similar sound propagation characteristics as the flow medium.
  9. The ultrasonic flow meter (1) according to any one of claims 1 to 8, characterized in that the flow medium (20) is a gas.
  10. The ultrasonic flow meter (1) according to any one of claims 1 to 9, characterized in that the flow medium (20) is a liquid.
  11. The ultrasonic flow meter (1) according to any one of claims 1 to 10, characterized in that the flow medium (20) is a phase mixture and/or has gaseous, liquid, or solid components.
  12. The ultrasonic flow meter (1) according to any one of claims 1 to 11, characterized in that the flow medium (20) is at least partially formed of H2O.
  13. The ultrasonic flow meter (1) according to any one of claims 1 to 12, characterized in that the sealing compound (24) behaves like polyurethane and/or like "AptFlex F7" and/or has components of polyurethane and/or "AptFlex F7", or is composed of polyurethane and/or "AptFlex F7".
  14. The ultrasonic flowmeter (1) according to any one of claims 1 to 13, characterized in that the thickness of the membrane (22) matches half of the wavelength of sound in the material of the membrane (22) or an integer multiple of said wavelength.

Description

This invention relates to an ultrasonic flow meter comprising a measuring tube through which a flow space extends, through which a flow medium can flow in at least one flow direction; a first ultrasonic transducer is installed at a first position, and at least one second ultrasonic transducer or at least one reflecting surface is installed at a second position, thereby enabling the transmission of ultrasonic waves into the flow space and the transmission of ultrasonic waves to be received again by the other ultrasonic transducer or by reflection from the reflecting surface, forming an ultrasonic propagation path; and an inner wall segment is installed inside the measuring tube, to which the transmission of ultrasonic waves strikes and is reflected. Based on Patent Document 1, an ultrasonic flow meter is known. This ultrasonic flow meter includes a measuring tube through which a flow space extends, and through which a flow medium flows. In this case, a first ultrasonic transducer is installed at a first position and a second ultrasonic transducer is installed at a second position in order to emit ultrasonic waves into the flow space and receive the emitted ultrasonic waves again by the other ultrasonic transducer. The ultrasonic sensors are positioned in the measuring tube at a predetermined angle to form an oblique path for ultrasonic waves through the tube. Ultrasonic waves can be emitted by a first ultrasonic transducer and received by a second ultrasonic transducer, and vice versa. When the flow medium flows along the longitudinal axis through the flow space of the measuring tube, the flow medium carries the ultrasonic waves to the receiving ultrasonic transducer more quickly than when sound propagates in the opposite direction of flow. Therefore, the resulting time-of-flight difference is evaluated by the evaluation electronic equipment, allowing for the inference of the flow velocity of the flow medium within the flow space of the measuring tube. Unfortunately, this leads to the drawback that, since the ultrasound must penetrate the tube wall, both ultrasonic transducers must be positioned on the outside of the measuring tube, forming a predetermined angle with respect to the longitudinal axis. Patent Document 2 discloses another configuration of an ultrasonic flowmeter. This ultrasonic flowmeter includes a measuring tube through which a flow space extends, through which a flow medium can flow, and a first ultrasonic transducer is positioned in a first position and a second ultrasonic transducer is positioned in a second position such that ultrasonic wave propagation occurs between the ultrasonic transducers. A flow restriction element is provided to affect the propagation of ultrasonic waves in the flow passage, the flow restriction element is positioned between two of three reflectors in total, the flow restriction element includes a first wedge having a first inclined surface, the first wedge having a plurality of first teeth protruding from the first inclined surface, the flow passage includes an inlet opening, the flow path includes an inlet opening, the inlet opening is positioned on the opposite side from the outlet opening, the fluid path extends from the inlet opening to the outlet opening, and the three reflectors are first reflectors The apparatus includes a first reflector, the most closely positioned of the three reflectors to the outlet opening; the three reflectors include a second reflector, the most closely positioned of the three reflectors to the inlet opening; a flow limiting element is inserted between the first and second reflectors; the flow passage has a fourth wedge with a fourth inclined surface, the fourth wedge having at least one tooth protruding from the fourth inclined surface, and the fourth wedge is positioned between the second reflector and the inlet opening. In particular, the flow limiting element significantly narrows the remaining flow cross-section, resulting in pressure loss in the flow meter. Ultrasonic flowmeters are the most precise and versatile instruments for measuring the flow rate of liquids and gases. They utilize the properties of ultrasound, which moves through various media at characteristic velocities. The velocity of the ultrasound is influenced by the flow velocity of the medium. The fundamental principles of ultrasonic flow measurement are based on three key methods: The time-of-flight method involves two ultrasonic transducers transmitting and receiving signals along and in the direction of flow, with the time-of-flight difference used to calculate the flow velocity. In contrast, the Doppler method measures the frequency change of ultrasound reflected by particles or bubbles in the medium, making it particularly suitable for media containing particles or bubbles. The cross-correlation method analyzes the delay between correlated signals from different transducers, making this method ideal for heterogeneous flows. Advances in technologies such as