CN102279057A - Pressure type fluid temperature sensor - Google Patents

Abstract

The invention discloses a pressure type fluid temperature sensor, which is composed of: a sealed rigid temperature bulb (1) containing a temperature-sensitive fluid inside, the rigid temperature bulb (1) and a fluid pressure sensor capable of outputting electrical signals via a connecting conduit (11). The pressure-sensing cavity (5) of the sensor (3) is connected. The fluid temperature sensor is resistant to electromagnetic interference and is suitable for the measurement of flammable and explosive fluids; it can output electrical signals and can be connected with a computer or network to realize remote monitoring.

Description

A pressure type fluid temperature sensor

technical field

The invention relates to a pressure type fluid temperature sensor.

Background technique

The easiest way to measure fluid temperature is with a mercury thermometer. However, it cannot output electrical signals, cannot automatically collect data, and cannot be connected to a computer or network for remote monitoring. Using thermocouples and platinum resistors to measure fluid temperature can output electrical signals and automatically collect data; however, because the probe itself is charged, there is a safety hazard for flammable and explosive fluids, and the probe is also susceptible to environmental electromagnetic interference, which affects the accuracy of measurement results. ..

Contents of the invention

The purpose of the present invention is to provide a pressure type fluid temperature sensor, which is resistant to electromagnetic interference and suitable for the measurement of flammable and explosive fluids; and can output electrical signals and can be connected with a computer or network to realize remote monitoring.

The technical problem solved by the present invention is that the adopted technical solution is: a pressure type fluid temperature sensor, which is composed of: a sealed rigid temperature bulb with a temperature-sensitive fluid inside, a rigid temperature bulb through a connecting conduit and a fluid capable of outputting electrical signals The pressure sensing cavity of the pressure sensor is connected.

Work process and principle of the present invention are:

Place the rigid temperature package in the fluid environment of the measured temperature. The temperature-sensitive fluid (gas or liquid) in the temperature package will sense the temperature of the fluid outside the package and will expand with heat and contract with cold to generate corresponding positive and negative pressures. The pressure passes through The connecting conduit is transmitted to the pressure-sensing chamber of the fluid pressure sensor, and the fluid pressure sensor measures the pressure of the pressure-sensing chamber and outputs an electrical signal, which changes in proportion to the fluid pressure inside the bag, and the fluid pressure inside the bag is in turn related to the pressure outside the bag. The ambient temperature of the measured fluid changes proportionally, thereby realizing the detection of the ambient temperature of the fluid outside the temperature bulb.

Compared with prior art, the beneficial effect of the present invention is:

1. The sensor can output electrical signals, which is convenient to connect with a computer or network to realize remote monitoring.

2. The temperature bulb and the fluid pressure sensor that uses the electric signal output are separated in space by the connecting conduit. The temperature bulb that is in direct contact with the measured fluid is not charged during measurement, and has high flame-proof, explosion-proof performance and safety. , suitable for the measurement of flammable and explosive fluids.

3. The sensitive effect of the temperature bulb on temperature is non-electromagnetic, and has a strong ability to resist electromagnetic interference, and is suitable for use in environments with large electromagnetic interference.

The inner diameter of the above-mentioned connecting conduit is 0.5-2.0mm.

In this way, the connecting conduit is actually a capillary tube, which can effectively transmit the pressure in the temperature bulb to the pressure-sensing cavity; at the same time, it can reduce the influence of the temperature bulb on the fluid pressure sensor due to heat conduction.

The fluid pressure sensor mentioned above is a silicon piezoresistive fluid pressure sensor.

The fluid pressure sensor mentioned above is a silicon capacitive fluid pressure sensor.

These two kinds of fluid pressure sensors are made by microelectronic technology, and have small volume and high sensitivity. In this way, the volume of the entire instrument can be reduced and its measurement accuracy can be improved.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

FIG. 1 is a schematic cross-sectional structure diagram of a pressure fluid temperature sensor according to Embodiment 1 of the present invention.

FIG. 2 is a schematic cross-sectional structure diagram of a pressure fluid temperature sensor according to Embodiment 2 of the present invention.

Detailed ways

Embodiment one

Figure 1 shows that a specific embodiment of the present invention is a pressure type fluid temperature sensor, which is composed of a pressure type fluid temperature sensor, and its composition is: a sealed rigid temperature bulb 1 with a temperature sensitive fluid inside, The rigid temperature bulb 1 communicates with the pressure sensing cavity 5 of the fluid pressure sensor 3 capable of outputting electrical signals through a connecting conduit 11 .

The inner diameter of the connecting conduit 11 in this example is 0.5-2.0 mm.

The fluid pressure sensor 3 in this example is a silicon piezoresistive fluid pressure sensor.

Embodiment two

FIG. 2 shows that the pressure fluid temperature sensor 3 of this example is basically the same as that of the first embodiment, except that the fluid pressure sensor 3 of this example is a silicon capacitive fluid pressure sensor.

The rigid temperature bulb 1 of the present invention can be made of materials with good heat transfer and strong rigidity, such as metals such as copper, stainless steel, aluminum, titanium, tungsten, or materials such as ceramics and glass. The temperature-sensitive fluid can be gases such as air, nitrogen, and argon, or liquids such as Freon, ether, and methyl chloride. Connecting conduit 11 then available copper, stainless steel, titanium or glass etc. are made. In addition to the above silicon piezoresistive and silicon capacitive fluid pressure sensors, the fluid pressure sensor 3 of the present invention can also be various pressure sensors capable of measuring fluid (gas, liquid) pressure and outputting electrical signals.

Claims (4)

1. A pressure type fluid temperature sensor, its composition is: the rigid temperature bulb (1) of the temperature-sensitive fluid of adornment inside sealing, rigidity temperature bulb (1) through connecting conduit (11) and the fluid pressure sensor ( 3) The pressure sensing cavity (5) is connected. 2. The pressure type fluid temperature sensor according to claim 1, characterized in that, the inner diameter of the connecting conduit (11) is 0.5-2.0 mm. 3. The pressure type fluid temperature sensor according to claim 1, characterized in that, the fluid pressure sensor (3) is a silicon piezoresistive fluid pressure sensor. 4. The pressure type fluid temperature sensor according to claim 1, characterized in that, the fluid pressure sensor (3) is a silicon capacitive fluid pressure sensor.

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