The sensing element

 

(57) Abstract:

Heat-sensitive switch relates to the field of electrical engineering and is intended for automatic control, regulation and monitoring of various thermal processes by switching the electric circuit if the temperature-controlled environment from a set value, for example, for a fire alarm. Thermophoretically as prototyp, comprises a cylindrical housing holds the contact system of the movable and fixed contact plates and heat-sensitive power element (TCSA). TCSA made of strips of material with shape memory effect and is situated between the housing and the movable contact plate. The movable contact plate of a cantilever in the dielectric wall of the housing. Unlike the prototype, the contact plates are arranged along the axis of the cylindrical body transverse to the axis direction of the opening of the contacts. TCSA performed as part of the loop, adjacent to the inner cylindrical surface of the housing, one end fixed and the free end is installed with the possibility of impacts on the movable contact. Design thermobaric the ideal of the pipe segment, and the contact plates have electrical outputs from opposite sides. Case thermophoretically second modification is made in the form of a sleeve and two contact plates printed on one side of the housing. The second option is preferable when thermophoretically has been part of the devices, which are increased demands on the tightness of the switch. Along the axis of the switch, the sensing element can be positioned to contact the contact plates by fastening a movable plate, and after it. The technical result is to provide a low inertia and technology. 5 C.p. f-crystals, 8 ill.

The invention relates to electrical engineering and is intended for automatic control, regulation and monitoring of various thermal processes by switching the electric circuit if the temperature-controlled environment from a set value, for example for fire alarm.

Known heat-sensitive switch that contains an axisymmetric body with conductive end walls forming the electrical outputs of the switch (see RF patent M 2087978, MKI H 01 H 37/40). Inside are conts follower. The sliding contact is made in the form of a membrane in the form of a profiled disk. Stationary contact rod is located on the axis of the housing. TCSA made of a material with shape memory effect in the form of a spiral or in the form of two symmetrical plates, one end fixed in the housing, and the other resting on the plunger. This switch, having a number of advantages over the traditional bimetallic thermophoretically, is not without disadvantages. The main one is the inertia, as TCSA is located inside a gated dielectric body having low thermal conductivity. In addition, the switch has a complicated production technology that requires stamping equipment for the manufacture of caps and diaphragms. A large inertia makes such thermophoretically of little use in fire alarm systems.

For the prototype we choose thermophoretically, partially devoid of these shortcomings (see RF patent N 2040816, MKI H 01 H 37/46, 61/06). The switch is a dielectric base which is fixed to the fixed contact in the form of a rod and the movable contact constituting a cantilever on the basis of the elastic plate flanged pin plate performs the function of the membrane, i.e. under the action of the elastic force closes the contact. The direction of the contact opening parallel to the axis of the housing thermophoretically. Contact force of the contact plate depends on its length. As the contact plate located across the cylindrical body of the switch, the size in the radial direction is significantly greater than the axial, that is, the switch is in the form of tablets. Between the bottom of the glass and the movable contact plate is TCSA made of foil tape from a material with shape memory effect in the form of a closed loop with rigid end connection. Here TCSA has a large contact surface with the front plane of the metal housing, which significantly reduces the inertia of such thermophoretically. Inertia and the sensitivity of thermophoretically determined by the size and thickness of its walls and the size of TCSA. However, reduction of the sizes in this design leads to a very serious disadvantage. End wall extruded housing with the overall small size of the switch has a thin wall, prone to deformation even in storage. Closed foil round of TCSA very sensitive to deformations of Torrigiani you must take special precautions boxed thermophoretically. Making a closed loop of TCSA requires the use of equipment, spot welding, which further complicates the manufacturing technology.

Thus, the object of the invention is to develop thermophoretically with low inertia and is adaptable to production.

The technical result achieved by the invention is to increase the resistance to deformation of the body without increasing its thickness and sizes.

To solve this problem, thermophoretically as the prototype, comprises a cylindrical housing holds the contact system of the movable and fixed contact plates and heat-sensitive power element. TCSA made of strips of material with shape memory effect and is situated between the housing and the movable contact plate. The movable contact plate of a cantilever in the dielectric wall of the housing.

Unlike the prototype, the contact plates are arranged along the axis of the cylindrical body transverse to the axis direction of the opening of the contacts. TCSA performed as part of the loop, adjacent to the inner cylindrical surface of the housing, one end fixed and svobodnoradikal can be implemented in two versions. In the first modification, the cylindrical body is made in the form of a segment of a pipe, closed at both ends by a dielectric, and the contact plates are selectremedy to the opposite ends.

Case thermophoretically second modification is made in the form of a sleeve, and the two contact plates printed on one side of the housing. The second option is preferable when thermophoretically has been part of the devices, which are increased demands on the tightness of the switch.

Along the axis of the switch, the sensing element can be positioned to contact the contact plates by fastening a movable plate, and after it.

To create more surface thermal contact of TCSA housing movable contact plate at the location of TCSA it is advisable to perform bending, shifting her from the axis to the cylindrical wall of the housing. Bending changes the elasticity of the movable contact plate.

The invention is illustrated in graphic materials. In Fig. 1 and 2 schematically depicts a longitudinal section and cross section thermophoretically first modification, and Fig. 3 and 4 is a second modification. Fig. 5 and 6 pokazyva with the case. In Fig. 7, 8 switch low operating force of the impact of TCSA by increasing shoulder bending of the contact plate.

The switch comprises a cylindrical metal housing 1 with a dielectric front wall 2, which becomes the dielectric insert, and in the first modification is made as a single part that covers both ends of the housing 1. Cylindrical body 1 made of cut pipe. Box 2 along the axis of the body fixed fixed 3 4 and movable contact plates. The movable contact plate 4 console fixed to the end part of the dielectric insert 2. In the construction of the switches shown in Fig. 1, 2, 5, 6, 7, 8 contact plates 3 and 4 have the electric wires to the opposite ends of the housing. In the construction shown in Fig. 3, 4 both contact plates 3 and 4 are the conclusions from one side of the casing 1 and the casing is made in the form of a sleeve. One-sided reports of contacts facilitate sealing the hull, because a tight seal is required only on one side.

Contact plates 3 and 4 in both modifications are located along the body axis and the direction of the contact opening 5 of the contact plates 3 and 4 perpendicular to this axis. This location is army to perform as part of a round and place it on the inner cylindrical surface of the housing 1. One end of TCSA 6 secured in the slots of the dielectric insert 2, and the other, free end abuts against the movable contact plate 4. Heat-sensitive element 6 is set to a shape memory on a bend with a radius greater than the radius of the hull, or on the plane.

The cylindrical surface of the housing is more rigid and less prone to deformation than the flat surface in the prototype when it is equal to the thickness of the walls. Thermophoretically becomes less demanding in terms of transportation, storage and operation. May reduce the wall thickness and size, which increases the sensitivity and performance of the switch. Simplified manufacturing technology, because the use of a standard workpiece (pieces of tubing or liner), eliminating the need for spot welding. The dielectric insert is made as one with the contact plates in plastautomat. In the second modification of the switch (Fig. 3, 4) mobile plate 4 after fabrication of bends mandrel for forming a movable recoil.

In the axial direction of TCSA 6 can be located before the contact areas 5 of the contact plates 3 and 4 from the side of the mounting plate 4, and after it. In p the e the force of the impact on her. In the second case, when the shoulder of the curve of the movable contact plate increases, required less effort, but more stroke the sensitive element 6. The second option is the location of TCSA allows you to reduce the size of TCSA, which further reduces the inertia of the system.

The surface of thermal contact of TCSA 6 with the housing 1 can be easily increased due to the width of the coil, or by increasing its length without changing the size. In the latter case, the movable contact plate 4 must be offset in the radial direction from the axis of the housing. In order to maintain the axial location of the outlets of the switch, the movable contact plate 4 at the location of TCSA 6 perform with U-shaped curve (see Fig. 5, 6) for switches that have TCSA 6 is located to the place of contact 5. For switches with the location of TCSA 6 after contact 5, the bending plate 4 can be made l-shaped. Bending plate changes its elastic qualities.

Works thermophoretically as follows. In the initial position, the movable contact plate 4 under the action of the elastic force causes the contact 5. At normal temperature, TCSA 6 has the shape of part of a coil with Radiolinja tends to turn in the round with a large radius bending or plate, pressing the contact plate 4 and cuts the connection 5. For this purpose, the parameters of the element 6 and the contact plate 4 should be selected so that the force developed TCSA 6 in the operating temperature range was larger than the drag force of the contact plate 4. For example, for fire alarm temperature alarm thermophoretically depends on the controlled object and varies from 56 to 93 degrees Celsius. The temperature of actuation of the switch is determined primarily by the composition of the alloy TCSA. For a given material and the dimensions of TCSA additional temperature control operation thermophoretically exercise, changing the contact force of the contact plate 4 by changing the thickness of the plate or adjustable lever length, i.e. the length of the plate 4. It is also possible temperature adjustment due to changes of the shoulder of the efforts developed by the element 6, by changing its location in the axial direction. When the cooling switch TCSA 6 again takes the form of a round part with a smaller bending radius and the contact plate 4 under the action of the elastic force closes contact 5.

The above described construction and operation of thermophoretically working on opening canadiense switch will work on contact closure.

1. Temperature-sensitive switch that contains a cylindrical metal housing with contact system of the movable and stationary plates, a closed dielectric end wall, in which a cantilever movable contact plate, and heat-sensitive power element (TCSA) made of a material with shape memory effect and located between the housing and the movable contact plate, characterized in that the contact plates are arranged along the axis of the cylindrical body transverse to the axis direction of the opening of the contacts, and TCSA performed as part of the loop, adjacent to the inner cylindrical surface of the housing, one end fixed, and the free end is installed with the possibility of impacts on the movable contact plate.

2. Heat-sensitive switch under item 1, characterized in that the body is made from a section of a pipe, closed at both ends of the dielectric and the contact plates have the electric wires to the opposite ends of the housing.

3. Heat-sensitive switch under item 1, characterized in that the casing is made in the form of a sleeve and the contact plates printed on one side of the body.

4. Ter is false to the point of contact of the contact plates by mounting the movable contact plate.

5. Temperature-sensitive switch according to any one of paragraphs.1 to 3, characterized in that TCSA in the axial direction is located after the contact location of the contact plates.

6. Temperature-sensitive switch according to any one of paragraphs.1 to 5, characterized in that the movable contact plate at the location of TCSA performed with bending, shifting her from the axis to the cylindrical wall of the housing.

 

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