JPH0128425Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a high temperature fluid flow meter, more specifically,
This invention relates to a high-temperature flowmeter that converts the flow rate of high-temperature fluid into an electrical signal, amplifies it, and measures it.

The rotor is rotated according to the flow rate of the fluid to be measured,
Various flowmeters have been proposed that measure the flow rate by integrating and displaying the rotation of the rotor, and are well known as, for example, oval flowmeters, roots flowmeters, and the like. One of the means for cumulatively displaying the rotation of the rotor is to integrate a permanent magnet into the rotor, and to install a Hall element, a reed switch, a magnetic Some devices include a magnetic sensor that changes in binary (on, off) depending on the presence or absence of magnetism, such as a resistive element, and amplify the output of the sensor and display the integrated value.

As mentioned above, in the case of a flowmeter that measures the flow rate of the fluid to be measured by electrically or magnetically detecting and amplifying it, the sensor part is relatively resistant to high temperatures;
The amplifier section is sensitive to high temperatures, and when the fluid to be measured is a high-temperature fluid, the high temperature of the fluid to be measured may be transmitted to the amplifier section, causing the amplifier section to malfunction or the electrical components of the amplifier section to be damaged. There were problems such as heat damage.

The present invention was developed in view of the above-mentioned circumstances, and is particularly designed to effectively protect the amplifier section from high temperatures in flowmeters that measure the flow rate of high-temperature fluid by converting and amplifying it into an electrical signal. The purpose of this design was to provide a flowmeter with a

The figure is a partial cross-sectional configuration diagram for explaining one embodiment of the present invention, in which 10 is a flow meter main body, 2
0 is a sensor section, 30 is an amplifier section, 40 is a heat shield section, and the flow meter main body 10 has an inlet IN through which the fluid to be measured flows into the meter main body 10, as is well known.
and a rear cover 11 having an outlet OUT through which the fluid to be measured that has passed through the meter main body 10 flows out, and filters dust, grains, etc. mixed in the fluid to be measured flowing in from the inlet IN. It consists of a filter 12, an end plate 13, a metering chamber 14 containing a rotor, such as an oval gear, which rotates according to the flow rate of the fluid to be measured flowing in, a front lid 15, and the like. The rotor is rotated according to the flow rate of the fluid to be measured. This rotation of the rotor is achieved by providing a magnetic sensing element 20 such as a Hall element, reed switch, or magnetoresistive element on the end face of the rotor at a position facing the permanent magnet M. Permanent magnet M is magnetic sensor 2
0, the magnetic sensor 20
If the magnetic sensor 20 is turned on or off, the magnetic sensor 20 will turn on or off according to the rotation of the rotor, and the flow rate of the fluid to be measured can be determined by counting the on/off operations of the magnetic sensor 20. can be weighed. In this case, since the output signal of the magnetic sensor 20 is minute, the output of the magnetic sensor 20 is generally amplified and counted. belongs to. The amplifier section 30 uses a large number of electronic components, which are generally sensitive to heat.If the fluid to be measured is a high-temperature fluid, the amplifier section will be affected by the heat. There was a risk that the electronic components in the amplifier section would be damaged by heat.

The present invention has been made to solve the above-mentioned problems, and in particular, to effectively isolate heat between the magnetic sensor 20 and the amplifier section 30 to protect the amplifier section 30 from thermal damage. It was done for that purpose.

In the figure, 41 is a cylindrical body having heat dissipation fins on its outer surface, and the sensor section 20 and amplifier section 30 are connected by the cylindrical body 41 having the heat dissipation fins.
A lead wire 2 from the sensor 20 passes through the cylindrical body.
1 is connected to the amplifier section 30. Therefore, the heat of the meter main body 10 is effectively radiated by the cylindrical body 41 having the radiation fins, and the lead wire 21 from the sensor section 20 is connected to the amplifier section 30 through the cylindrical body. I can do it. In this way, the present invention effectively isolates heat between the sensor section 20 and the amplifier section 30, and also wires the lead wire 21 from the sensor 20 through the heat dissipation cylinder. 20 may be radiated within the cylindrical body 41 and transferred to the amplifier section 30. The present invention is designed to effectively shield such thermal radiation, and the thermal insulating plate 42 shown in the figure is provided for this purpose. The wire plate 42 effectively blocks the radiant heat from being transmitted to the amplifier section 30, and the radiant heat from the sensor section 20 is transmitted to the heat dissipating cylinder 41.
and is effectively radiated by the heat radiating cylinder 41. In this way, the detection signal transmitted to the amplifier section 30 and amplified by the amplifier section 30 is transmitted to any desired location through the lead wire 31 and displayed on an integration display (not shown).

As is clear from the above description, according to the present invention, in a flowmeter that electrically or magnetically detects and amplifies the flow rate of a high-temperature fluid to be measured, the sensor section and the amplifier section are effectively thermally isolated. Therefore, the amplifier section can be effectively protected from malfunction or thermal damage due to the influence of heat. Also,
Conventionally, a long cylindrical body was required for heat dissipation, but according to the present invention, by arranging a heat insulating plate inside the cylindrical body, it is possible to make the cylindrical body short and small. By arranging the insulating plate within a cylindrical body having a heat dissipating surface, it becomes possible to form a compact heat shielding plate.

[Brief explanation of the drawing]

The figure is a partial cross-sectional configuration diagram for explaining one embodiment of the present invention. 10...Measuring instrument body part, 20...Sensor part, 3
0... Amplifier section, 40... Heat cutoff section, 41... Heat radiation cylinder, 42... Heat insulation plate.

Claims (1)

[Scope of utility model registration request] Equipped with a metering chamber section having a rotor that rotates according to the flow rate of the high temperature fluid to be measured, a sensor section that electrically or magnetically detects the rotation of the rotor, and an amplifier section that amplifies the output signal of the sensor section. In the flowmeter, the measuring chamber and the amplifier are connected by a cylindrical body in which a plurality of heat radiation fins are arranged in parallel, and a thermal insulating plate for blocking heat radiation is disposed inside the cylindrical body. High temperature fluid flow meter.