JPS5926245Y2 - Bypass type fluidic flow meter - Google Patents

Description

[Detailed description of the invention] This invention is mainly used to integrate the amount of heat consumed in each unit when distributing and supplying a heat transfer fluid such as a heating medium or a cooling refrigerant to each unit in a housing complex or a certain area. The supply amount of heat transfer fluid, which is a factor in
In other words, it measures the flow rate, and compared to the tangential impeller type flow meter that has been used in the past, it has no mechanical moving parts, and has heat-resistant and corrosion-resistant treatment to maintain the durability of that part. It is unnecessary and the entire structure is simple, compact, and easy to construct at low cost. ◎ There is no performance deterioration in the low flow rate range due to frictional loads on mechanically moving parts, and the measurement flow rate range can be widened.

Installation with a wide range of air bubble accumulation and stagnation phenomena in the O fluid does not occur within the inclined angle, making installation easy and with very little measurement error.

(2) It is not easily influenced by the pressure, temperature, viscosity, specific gravity, etc. of the fluid, and can accurately determine the volumetric flow rate of any fluid.

A fluidic flowmeter that uses a fluidic element has many advantages in terms of structure and performance. Specifically, an orifice is provided in the fluid flow path, and the upstream and downstream portions of the orifice are arranged with respect to the axis of the flow path. Bypass channels are connected at right angles or approximately at right angles, and fluid flows periodically and automatically in proportion to the fluid flow velocity between these two bypass flow channels in a parallel or nearly parallel attitude to the axis of the flow channel. The present invention relates to a bypass type fluidic flowmeter that is provided with a fluidic element that changes direction and is provided with a detection device that captures periodic changes in the flow direction caused by the fluidic element as a pulse signal.

In addition to the above-mentioned advantages, the bypass fluidic flowmeter with the above configuration incorporates a fluid element in a relatively small flow area flowing in the bypass flow path with respect to the fluid flow path. In addition to reducing the pressure loss and making the structure more compact, it is possible to detect flow rate over a wide flow rate range by simply changing the design of the onofice diameter according to the measured flow rate range and pipe dimensions, etc. It has the advantage that it can be implemented advantageously in terms of economy, production, and strength by using one type of fluid element.

The purpose of this invention is to significantly improve the flow rate detection accuracy of the bypass type Freydijk flowmeter, which has the above-mentioned features, by effectively utilizing the unique phenomenon obtained due to the bypass type. have

In the bypass type fluidic flowmeter according to the present invention, in which the detection device is configured as described in detail at the beginning, the detection device is installed at the fluid outlet portion from the fluid element to the downstream side bypass flow path in accordance with the flow direction change. It is characterized by comprising a pressure detection element inserted into one of the left and right vortex areas which are alternately generated.

That is, in the bypass type flowmeter, vortices are generated alternately on the left and right sides of the fluid element outlet due to periodic changes in the fluid flow direction.

The vortex generation region has a much larger pressure change than the feedback flow path of the fluid element.

This invention is a unique phenomenon obtained due to such a bypass shape, and the pressure detection element is inserted into one side of the vortex area where the degree of pressure change is larger than other parts, and the pressure detection element is inserted in one side of the vortex area where the degree of pressure change is larger than other parts. It is possible to reliably and accurately detect periodic changes in the flow rate as a pulse signal, and therefore, the desired flow rate detection can be performed with extremely high accuracy even though the detection is in a small flow rate region.

Next, the embodiment of the present invention will be described in detail based on the figures.
The figure shows a flow path 3 in which a heat transport fluid such as high-temperature water is circulated between a thermal energy supply device 1 and a load device 2.
a first temperature sensing element 4 for measuring the temperature of the fluid supplied to the load device 2; A second temperature sensing element 5 measures the discharge temperature, a voltage detection section 6 detects the temperature difference between the temperatures measured by the temperature sensing elements 4 and 5 as a voltage difference, and the number increases or decreases in direct proportion to the detected voltage difference. A temperature difference detection device 8 having a V-F converter 7 that generates a pulse signal is provided, and counts the number of pulses from the V-F converter 7, and issues a command when the count reaches a set value. A display device 11 having a counting mechanism 9 that transmits a signal and an integration display mechanism 10 that operates based on the command signal is provided.

Further, a flow rate detection device 12 (referring to the fluidic flow meter of the present invention, the specific configuration of which will be described later) detects the amount of fluid that has passed through the load device 2.

), and a pulse transmitter 13 that transmits a pulse signal with a set pulse width each time the measured value by the flow rate detection device 12 reaches a certain value, and a pulse transmitter 13 that transmits a pulse signal with a set pulse width. A pulse width adjustment device 14 is provided for changing the settings.

The temperature sensing elements 4 and 5 are constructed using a PN junction semiconductor, and utilize changes in the forward voltage drop of the semiconductor due to changes in the temperature of the heat transport fluid to increase the temperature of the heat transport fluid. The device is configured to convert temperature changes into voltage changes.

As shown in FIGS. 2 and 3, a pipe 26 having joining flanges 26A, 26A at both ends of the fluid flow path 3 is connected in the middle of the fluid flow path 3, and the flow inside this pipe 26 is Road 3
An onofice 27 that generates pressure loss is provided inside,
Bypass passages 28 and 29 are connected to the upstream and downstream parts of the orifice 27 and are oriented upward at right angles or substantially at right angles to the axis of the flow passage 3, and between the upper ends of both bypass passages 28 and 29. The flow rate detection device 12 using the fluid element 24 is installed in a horizontal position parallel or substantially parallel to the axis of the flow path 3.

As clearly shown in FIG. 4, the flow rate detection device 12 incorporates a fluid element 24 that periodically and automatically changes the flow direction of the fluid by its own self-oscillation. To explain the effect in detail, the fluid flowing in from point 15 increases its flow velocity due to the presence of the throttle, bends the flow path at point 20 so as to adhere to one wall surface 16 due to the Coanda effect, and flows at point 17. The main jet stream A flows into the downstream bypass passage 29 via the outlet part 18 having the same cross-sectional area as the inlet part 15, while the branched flow opening flows into the feedback passage 19. 20, which influences the main jet and bends it so that it adheres to the other wall 16'.

Then, this jet flow reaches 17', and the main jet flow A' flows through the outlet part 18 to the downstream bypass flow path 29, while the branched flow port ' flows into the feedback flow path 19'.
20 and, as before, influences the main jet and changes the direction of the flow.

In this way, the flow direction of the main jet flow is periodically and automatically changed in proportion to the flow velocity of the bypass fluid. In this case, as shown in FIG. 5, vortices a and a' are alternately generated on the left and right as the fluid flow direction is changed.

Therefore, the pressure detection element 21 is located in either the left or right vortex area.
By positioning the fluid element 24 in the inserted position, periodic changes in the flow direction due to the fluid element 24 are captured, and this is transmitted as a pulse signal to the counting mechanism 9 via the pulse transmitting device 13 described above to display the cumulative amount of heat. It is possible to do so.

In FIG. 1, 23 indicates the voltage detection section 6, V-F.
This is a power saving switch interposed in a power supply mechanism from a power supply device 22 to the converter 7, the counting mechanism 9, and the display mechanism 10.

In the above embodiment, since the pressure detection element 21 is actuated once when a certain amount of heat transfer fluid passes, the amount of heat transfer fluid that has passed can be determined by the number of pulses sent from the pulse transmitter 13. , pulse transmitter 1
Since the pulse width of the pulse signal from 3 is constant, V-
The number of pulses sent from the F converter 7 to the counting mechanism 9 in one transmission is determined by the difference in temperature measured by the thermosensors 4 and 5, and as a result, the number of pulses counted by the counting mechanism 9 is the same as that of the load device 2. The amount of heat consumed is , and this is what is displayed.

[Brief explanation of the drawing]

The drawings show an embodiment of the bypass type fluidic flowmeter according to the present invention, in which Fig. 1 is a block diagram of the state in which it is applied to an integral calorimeter, Fig. 2 is an enlarged partially cutaway perspective view of the main part, and Fig. 3
The figures are a vertical sectional view taken along the line III--III in FIG. 2, FIG. 4 is an enlarged plan view of the fluid element, and FIG. 3... Fluid flow path, 21... Detection tool, 2
4... Fluid element, 27... Orifice, 28.29... Bypass channel.

Claims (1)

[Scope of utility model registration request] An orifice 27 is provided in the fluid flow path 3, and bypass flow paths 28 and 29 that are perpendicular or approximately perpendicular to the axis of the flow path 3 are connected at the upstream and downstream portions of the orifice 27, and these Across the flow paths 28 and 29,
A fluid element 24 that periodically and automatically changes the fluid flow direction in proportion to the fluid flow velocity in a posture parallel or substantially parallel to the axis of the flow path 3 is provided, and the periodic change in the flow direction by the fluid element 24 is In a bypass fluidic flow meter configured with a detection device 21 that captures pulse signals, the detection device 21 is connected to the fluid outlet section 29A from the fluid element 24 to the downstream bypass channel 29 to detect the flow. A bypass type fluidic flowmeter characterized in that it consists of a pressure detection element inserted into one of the left and right vortex areas that are alternately switched and generated as the direction changes.