The device measuring the level of a cryogenic liquid on the basis of discrete monolithic high-temperature superconductors

 

(57) Abstract:

The invention relates to cryogenic engineering. Device for measuring the level of cryogenic liquid consists of a sensor and the secondary recording unit. The sensor is a combination of sensitive high-temperature superconducting (HTS) elements of yttrium ceramics. HTS elements are connected in series in a single chain and are staggered along the length of the sensor inside the dielectric base or on top of him. The heater uses a CHIP resistor or a conductor of a high-resistance alloy. The heating elements turn on sectional or along the entire length of the sensor. The technical result consists in increasing the accuracy, availability of wide range of applications and versatility of use. 2 C.p. f-crystals, 3 ill.

The present invention relates to the fields of cryogenic engineering, cryogenic engineering.

This device can also be used where applicable liquefied nitrogen, oxygen, argon:

1) in industry, in the exercise of certain technological operations;

2) modern magnetic HTS (high Temperature with the e: klapproth for gynecology, Oncology, proctology, ENT, and others, as well as in klapproth for cosmetology and dermatology, equipment for General and local cryotherapy, equipment for freeze/thaw and long-term storage of biological products (blood, bone marrow, and other biomaterials);

4) in agriculture for storing biological substances;

5) Metrology - cooling node electron gun electron microscope;

6) in radio astronomy, when cooled, highly sensitive input stages radios mm waveband;

7) in show business, for special effects.

Also there is a need to determine the level of the refrigerant during its transportation in Dewar vessels, such as: 50LD,35LD, 25LD and oxygen/asadabadi stations DTP-70, MKDS-70.

Analogue of the invention is the following patent:

S. Siegmann, N. J. Guntherodt "Fullstandsdetector fur Kryogene Flussigkeiten", Int. Patent PCT/CH90/00166, the main drawback of which is the way of realization of the long sensitive element on the basis of HTS (high Temperature superconductor) of the conductor, in contrast, this device is designed as a series of miniature HTS elements connected in a circuit that allows used for assigning chuvstvitelnostyu sharp changes of level and wider measurement range. The measurement accuracy is defined by the location of the HTS elements and limited to their minimum size and width of the dielectric base on which they are located. Therefore, it is possible to create sensors on the length of more than 1.5 meters. In addition, the presence of discrete elements permit allows local, sectional heating, making this type of sensor is advantageous compared to analogue, which is heated along the entire length of the sensing element.

Specified in the characterizing part of the formula signs suggest the proposed solution meets the criterion of "novelty". As the set of distinctive signs and restrictive parts unknown of scientific-technical and patent literature, the device meets the criterion of "inventive step".

The invention is illustrated in Fig. 1-3, where

Fig. 1 - view of the sensor from above;

Fig. 2 - the image slice of the sensor with the heater on the basis of resistors;

Fig. 3 - the image slice of the sensor with the heater on the basis of a high-resistance alloy;

Figure 1:

1 - HTS-sensor - sensitive element (Y-123);

2 - pécs is ceramics or other resistant to the refrigerant dielectric.

On the figure 2:

1 - HTS-sensor - sensitive element (Y-123);

2 - heating element: CHIP resistor;

3 - based hosting sensitive HTS sensors;

4 - heat insulator to reduce the influence of the heating element on the medium;

5 - dielectric insulating gasket;

6 - solder (POS 61) providing mechanical and electrical connection;

7 casting compound.

Figure 3:

1 - base hosting sensitive HTS elements;

2 - heater;

3 - sensitive HTS element.

Device for measuring cryogenic liquid consists of 2 parts: the level sensor and the secondary block.

The level sensor is a set of tiny elements, made of a monolithic piece of yttrium ceramics (Y1Ba2Cu3ABOUT7), The HTSC material (Y-123). Item sizes are chosen based on the desired resolution and technological restrictions on their manufacture. It is recommended to use the size corresponding to the CHIP-resistors (1.550.8 mm; 2.01.25 mm; 3.21.6 mm). The ends of the sensors are equipped with contacts through which the connection with pechay interelement switching (it is transferred to the measuring current from sensor to sensor) and removal of indications. The stacking order of HTS elements may be different (chess, intervals, and so on), for example U-shaped. This arrangement of the sensing elements allows to minimize the measurement error caused by the temperature gradient along the length of the base of the transmitter.

The work plane HTS elements in contact with the environment, both directly and through the heat-conducting plate. To the opposite side of the sensing elements adjacent the heater. The heater is necessary in order to accelerate the transition elements, in pairs, in normal (non-superconducting state). The implementation of the heater or in the form of a set of standard CHIP resistors (Fig. 1), either in the form of the zigzag conductor located in the thickness of the substrate (Fig. 3).

External contacts HTS sensor is connected to the secondary recording unit. One pair of external contacts - current. The second pair - potential. In addition to measuring wires attached to the sensor heating conductors that produce heating of the coil of the sensing element, then through the current contacts (I+I-the sensor is skipped measuring current, which determine the m state. Because the level of superconductivity along the sensor varies in accordance with the level change of the refrigerant, changing the voltage taken from the potential end (U+U-) (noise current is constant). The value of the fixed secondary voltage supply is inversely proportional to the level of the refrigerant in the vessel. The registering unit provides a constant flowing current, measuring intervals of time not more interval resolution (to reduce the introduction of perturbations in the medium) and heating of the heater or the entire length of the sensor, or sectional. When the sectional heat level of the refrigerant is determined by the partition number and its ultimate resistance. Sectional heating is preferred because it has minimal insertion perturbation in the medium, however, requires a more complex control system and analysis of the location of the surface of cryohydrate. While the implementation of the registering unit is different from the standard (constant current source and inducing device), because it requires the presence of an adaptive system reading.

The device provides a measurement of the level of cryogenic liquid with the maximum possible accuracy of the air, and as a consequence drop crystals of frost on the working surface of the sensor, which distinguishes this type of device from the other level sensors (capacitive, ultrasonic, and so on ). The invariance of the physical characteristics of sensitive HTS elements makes this transmitter from resistive. The ability to make the sectional heat is an advantage of this device over those types of sensors, where heating is provided throughout the length of the sensor - level meter. The above technical result leads to an expanding Arsenal of technical means of measuring the level of cryogenic liquid (level gauges).

The specified device can be manufactured at the enterprises of the R. F., which corresponds to the criterion "industrial applicability".

1. Device level measurement of cryogenic liquids, consisting of a sensor comprising a sensitive and heating elements, and the secondary recording unit, wherein the sensor transmitter is a set of sensitive high-temperature superconducting (HTS) elements of yttrium ceramics, connected in series in a single chain and staggered on destory or conductor of a high-resistance alloy.

2. The device under item 1, characterized in that the heating elements may be incorporated sectional or along the entire length of the sensor.

3. The device under item 1 or 2, characterized in that the HTS elements made of yttrium ceramics Y-123 (Y1Ba2C3ABOUT7).

 

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