SU1451556A1 - Temperature-sensitive element - Google Patents

Abstract

The invention relates to a measurement technique and can be used in devices for emergency shutdown of objects, the temperature of which has exceeded the permissible limits. The purpose of the invention is to increase the reliability and expansion of the measurement range. The temperature sensor contains a bimetallic plate 1 symmetrically bent relative to the center, a piezo plate 2 and a base 3. The ends of the free ends of the piezoplate 2 and the tongue 4 of the bimetallic plate 1 are installed with a gap relative to each other. A permanent magnet 5 is attached to the free end of the piezoplate 2. Depending on the temperature of the base 3, the position of the free end of the tongue 4 is fixed by the field of the permanent magnet 5 over one of its poles. In this case, friction between the tongue 4 and piezoplate 2 is eliminated. The magnetic circuit in the form of a pack of plates of a calibrated mass of ferromagnetic material provides an extension of the measuring range. 3 hp f-ly, 3 ill. (L

Description

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The invention relates to measuring equipment, namely, devices for measuring and recording fixed temperatures, and can be used in emergency shutdown devices for objects whose temperature has exceeded the permissible limits.

The purpose of the invention is to increase the reliability and broaden the measurement range.

Figure 1 shows the proposed sensor that temperature; Fig. 2 shows an embodiment of a sensor assembly with a magnet-like wire in the form of two plates of calibrated thickness, each of which is located in the plane of the pole of the permanent magnet; in FIG. 3, a cong structure of the free end of the tongue in the shape of a brand, the shelf of which occupies a neutral position with respect to the pole magnet.

: The temperature sensor contains, a .sym .. a bimetallic plate 1, which is metalically bent relative to the middle, a piezoplate 2, installed along the symmetry axis of the bimetallic plate 1 and rigidly fixed at one end on the base 3 in one plate with a bimetallic plate, which is equipped with a tongue 4 facing the piezoplates. Wherein

The free ends of the piezoplates 2 and tongue 4 are set with a gap nriyr relative to each other. To the free end of piezoplate 2 is attached a constant mash 5 in the form of a bar with parallel faces. The constant MiirHHT 5 is attached to the free end of the piezoplate 2 so that its magnetic axis is oriented (lies) in the plane of bending of the bimetallic n, justin 1, and the free end of the pinch

Channel 4 has the ability to move over it from one pole to the other.

To provide discrete adjustment, the sensor is in the required temperature range of operation in FIG.

depicts a node in which the boundaries

Sensor pickups are set by two plates (magnetic core) 6 with a ca- dibic thickness of ferromagnetic material, each of which is located in the plane of the pole of the permanent magnet and the magnetic field, but can also have an additional type of attachment, for example, using glue. In general,

15

20

25

thirty

35

40

five

0

five

0

five

50

55

In addition, the magnetic core 6 can be a pack of plates of calibrated thickness of ferromagnetic material, located both on one and on both sides of the poles of the magnet, and the discreteness of the adjustment depends on the chosen plate thickness.

To obtain an additional (neutral) stable temperature trigger point, FIG. 3 shows a sensor assembly, in which the free end of the pin 4 is filled with a brand. In this case, the width of the flange is equal to the interpolar distance of the magnet 5. In the case of using the magnetic conductor 6, the width of the flange of the brand is increased by the total size of the plate thickness.

The temperature sensor works as follows.

In the initial state, depending on the temperature of the base 3 (Fig. Or, the position of the free end of the tongue 4 is fixed by the field of the permanent magnet 5 over one of its poles. In the process of decreasing (decreasing) the temperature of the base 3 of the sensor, it increases (decreases) and The temperature of the bimetallic plate 1, rigidly embedded with its ends at the base 3. Plate 1, bent from the effects of temperature, moves the free end of the tongue 4 towards the other pole of the magnet 5. At the beginning this movement has a smooth character restrained by elastic by the material of the tongue 4 and the magnetic field of the pole of the magnet 5, over which there is currently a free end of the tongue, but at a certain temperature (as a result of the prevailing influence of the magnetic field of the other pole), the free end of the tongue 4 abruptly passes and takes a fixed position above this pole (trigger effect), while the piezo plate 2 produces a pulsed electrical signal of one polarity.

When the temperature is lowered (raised), the described process repeats in the opposite direction, and piezoplate 2 produces a pulsed electric signal of a different polarity.

The temperature range of the sensor operation depends on the distance between the planes of the poles of the permanent magnet 5. Introduction to the sensor design of the magnetic circuit 6 in the form of plates of calibrated thickness of ferromagnetic material, as shown in Fig. 2, allows, in particular, to expand the temperature range sensor operation by increasing the interpolar distance of the magnetic system.

The width of the shelf is a size equal to the distance between the planes of the poles of the permanent magnet.

In the manufacture of the sensor, in particular, a tongue with specified elastic properties, it is possible to vary the choice of not only the material (J UrtLi l - r "l lit.%, -, ..-- -f - Fragment of the sensor design, poly, but and constructive recognition ... ".." h Achlt t liat ıТТ4ПГГ

as shown in FIG. 3, it is possible to obtain additional (neutral) stability of the temperature point of operating by imparting the free end of the tongue 4 to the shape of the brand. At the same time, the neutrality of the position is achieved by choosing the width of the shelf of the brand equal to the interpolar distance at which the interaction forces of the magnetic field of the poles with the shelf of the brand balance. This equilibrium is disturbed by the further movement of the tongue 4, caused by the bending of the bimetallic plate 1. Depending on whether the temperature of the base 3 increases or decreases, the shelf of the Taurus jumps and takes a position at which one of its lateral planes is fixed above the corresponding pole the magnet 5, and the piezoplast 2, each time it triggers, produces a pulsed electrical signal of a certain polarity. This excludes mechanic-g. A rigid connection (friction) between the tongue 4 and the piezoplate 2, which improves the reliability of the sensor.

The design of the sensor determines the possibility, firstly, of ensuring that it is adjusted to the required temperature range with predetermined response limits due to trusses: first, only the free end of the tongue can be made of ferromagnetic material, and secondly, in the plane of bending The tongue can be 15 crimped, and thirdly, the tongue can be interchangeable.

Claims (3)

1. A temperature sensor containing a bimetallic, temperature-sensitive plate with a tongue freely positioned along its symmetry axis, and rigidly fixed ends and a piezoplast 25 with one rigid end and another free and facing the tongue of the heat-sensitive plate, distinguished by that, in order to increase reliably to 30 ti, it is equipped with a permanent magnet attached to the free end of the piezoplate, while the magnetic axis of the permanent magnet is oriented in the plane of bending of the bimetallic plate, and ortsy free ends of the tongue and the piezoceramic plates are installed with a gap relative to each other, wherein the tongue is made of a ferromagnetic material. 2. Sensor POP.1, characterized in that, in order to extend the measuring range, a magnetic circuit is installed at the poles of the permanent magnet in the form of a package of plates 40 the limits of operation due to us-: 1; b; a crowd of optics performed by installing a magnetic circuit at the poles of the post-45. This magnet, the magnetic core is made in the form of one or several (assembled in a package) plates of a calibrated thickness of ferromagnetic material, secondly, to enable the sensor to work in three-position temperature control systems, performed according to the little-nor-many scheme due to the fact that the free end of the tongue is you (made of ferromagnetic material. 3. Sensor POP.1, I differ by the fact that the free end of the tongue is made in the form of a brand width The 50 shelves of which are equal to the distance between the planes of the poles of the constant mannite. 4 A POP.1 sensor, characterized in that the die in flat The 55 bend is made corrugated. The width of the shelf is a size equal to the distance between the planes of the poles of the permanent magnet. In the manufacture of a sensor, in particular a tongue with specified elastic properties, it is possible to vary the choice of not only the material, but also the constructive acknowledgment, but also the constructive recognition. ".." h Achlt t liat iyTT4PGG Kami: firstly, only the free end of the tongue can be made of ferromagnetic material, secondly, the tongue can be made corrugated in the plane of bending, thirdly, the tongue can be interchangeable. Formula iso bratis 0 1. A temperature sensor containing a bimetallic, heat-sensitive plate with a tongue freely positioned along its symmetry axis, and rigidly fixed ends and a piezoplast 5 with a rigidly fixed end and the other loose and facing the tongue of the heat-sensitive plate, characterized by that, in order to increase reliability, it is equipped with a permanent magnet,. attached to the free end of the piezoplate, while the magnetic axis of the permanent magnet is oriented in the bending plane of the bimetallic plate, and the ends of the free ends of the tab and the piezoplates are installed with a gap relative to each other, while the tab is made of a ferromagnetic material. 2. Sensor POP.1, characterized in that, in order to extend the measuring range, a magnetic circuit is installed at the poles of the permanent magnet in the form of a package of plates 40 :one; b; ovatoy crowd, performed 45. GGma rial.  :one; b; ovatoy crowd, performed 45. GGma rial. (from ferromagnetic material. 3. POP.1 sensor, distinguished by - and with the fact that the free end of the tongue is made in the form of a brand, width The 50 shelves of which are equal to the distance between the planes of the poles of the permanent magnet. 4 A POP-1 sensor, characterized in that the tongue in the bending plane is corrugated. N r cfjus.Z CfJUS.S