RU59322U1 - END SWITCH - Google Patents

Abstract

The utility model relates to electrical products, in particular to limit switches, and is intended for remote control of valves of pipeline valves in stationary installations and can be used to signal the position of valves (closed or open) in alternating current circuits with voltage of 380 V at a frequency of 50 or 60 Hz and direct current voltage of 220 V and a rated operating current of 2.5 A. The technical result that can be obtained using the proposed utility model is to expand the number of and gear ratios: 1: 8, 1:44, 1:50, 1: 100, 1: 240 and the use of explosion-proof microswitches, in which the parts causing sparking during normal operation are enclosed in an explosion-proof microswitch shell made in accordance with the requirements GOST R 51330.1-99, and not sparking in the normal mode of electrical parts - into a shell with protection of the type "e", made in accordance with GOST R 51330.8099. The limit switch (1st option) consists of a housing 1, a gearbox 2, a block of microswitches 3, covers 4 and 5, an input device 6, a lever 7, a cam shaft 8 and a screw 9 for adjusting the actuation position, while the lever 7 is connected to the cam shaft 8 through gearbox 2, the latter being configured to expand the number of gear ratios of the gearbox: 1: 8, 1:44, 1:50, 1: 100, 1: 240, and parts of the microswitch block 3 that cause arcing during normal operation are enclosed into the flameproof enclosure of microswitches 3, not a call sparking guides - the shell-protected species "e", the inner and outer grounding clamps (not shown in FIGS.).

The limit switch (2nd option) consists of a housing 1, a gearbox 2, a block of microswitches 3, a cover 4 and 5, an input device 6, a lever 7, a cam shaft 8, a screw 9 for adjusting the actuation position and an input box 10 with cable entries ( in Fig. not shown), while the lever 7 is connected to the cam shaft 8 through gearbox 2, the latter being configured to expand the number of gear ratios of the gearbox: 1: 8, 1:44, 1:50, 1: 100, 1: 240 , while the parts of the block of microswitches 3, causing sparking during normal operation, are enclosed into the flameproof enclosure of the microswitches 3, and not causing sparks, into the enclosure with protection type “e”, internal and external grounding clamps (not shown in FIG.).

Description

The technical field to which the utility model relates.

The utility model relates to electrical products, in particular to limit switches, and is intended for remote control of valves of pipeline valves in stationary installations and can be used to signal the position of valves (closed or open) in alternating current circuits with voltage of 380 V at a frequency of 50 or 60 Hz and direct current voltage of 220 V and a rated operating current of 2.5 A.

State of the art

A circuit breaker is known comprising a contact system consisting of movable and fixed contacts with current leads, a contact spring, a movable contact drive, an overcurrent release, an arcing chamber and a magnetic blast system consisting of current windings connected in series to a fixed contact circuit, ferromagnetic cores and ferromagnetic plates located on both sides of the ferromagnetic cores and the arcing chamber, while the current windings are fixed contact leads, and ferromagnetic cores are made in the form of windings covering the fixed contact conductors (see USSR AS No. 1511784, class NOS 1 N 73/00, 9/30, publ. 09/30/1989).

The disadvantage of this switch is its low reliability against explosion and mechanical strength.

Known end push-button microswitches compact sealed design with die-cast aluminum housing.

The switches are supplied with controls of various designs in housings for side or floor mounting, as well as with one or two bushings for wires of type PG 13.5, type of protection according to D | NP 50 or P 54 (dustproof and splashproof or respectively hermetic design) ( see the BZV 7 | 9 and BZV 7 | 9 series push-button microswitches, Honejwell brochure, product overview “Electrical and Electronic Components”.

The disadvantage of these push-button switches is the design complexity.

The closest in technical essence and the achieved positive effect and accepted by the authors for the prototype is an explosion-proof trip switch VP-701 with explosion protection marking 1 ЕхllТ6 X, comprising a housing with a cover, in which a microswitch unit, an input device, a lever connected to the camshaft via a gearbox are installed , screw (see. Technical description and operating instructions. "Oil-filled switches VP-701", Vneshtorgizdat, 1987).

The disadvantages of this switch is that the switch has the form of explosion protection - oil filling of the shell “o”, which complicates maintenance during operation, the lack of precise adjustment of the operation of microswitches, and the fact that the gearbox can have only two versions with a gear ratio of 1:50 and 1: 100.

Utility Model Disclosure

The technical result that can be obtained using the proposed utility model is to expand the number

reduction gear ratios: 1: 8, 1:44, 1:50, 1: 100, 1: 240 and the use of explosion-proof microswitches, in which the parts causing sparking during normal operation are enclosed in an explosion-proof microswitch shell made in accordance with the requirements of GOST P 51330.1-99, and not sparking in the normal mode of electrical parts - into a shell with type “e” protection, made in accordance with GOST R 51330.8099.

Brief Description of the Drawings

Figure 1 shows the limit switch, General view (1st option). In Fig.2 given the limit switch, General view (2nd option).

Utility Model Implementation

The limit switch (1st option) consists of a housing 1, a gearbox 2, a block of microswitches 3, covers 4 and 5, an input device 6, a lever 7, a cam shaft 8 and a screw 9 for adjusting the actuation position, while the lever 7 is connected to the cam shaft 8 through gearbox 2, the latter being configured to expand the number of gear ratios of the gearbox: 1: 8, 1:44, 1:50, 1: 100, 1: 240, and parts of the microswitch block 3 that cause arcing during normal operation are enclosed into the flameproof enclosure of microswitches 3, not a call guides arcing - wrapped with a type of protection "e", the inner and outer grounding clamps (not shown in FIGS.).

The limit switch (2nd option) consists of a housing 1, a gearbox 2, a block of microswitches 3, a cover 4 and 5, an input device 6, a lever 7, a cam shaft 8, a screw 9 for adjusting the actuation position and an input box 10 with cable entries ( in Fig. not shown), while the lever 7 is connected to the cam shaft 8 through

gearbox 2, the latter being made with the possibility of expanding the number of gear ratios of the gearbox: 1: 8, 1:44, 1:50, 1: 100, 1: 240, while the parts of the microswitch block 3 that cause arcing during normal operation are enclosed in flameproof the shell of microswitches 3, but not causing sparks, into the shell with protection of type “e”, internal and external grounding clamps (not shown in FIG.).

The limit switch (1st and 2nd options) is operated as follows.

Switching the microswitch block 3 on and off is carried out using the lever 7 from the camshaft 8 through the gearbox 2. The response positions are adjusted with the screw 9. Using the input box 10 with cable entries, the cable is inserted with an outer diameter of up to 25 mm. Internal and external grounding clamps ensure the safety of maintenance personnel, and gearbox 2 extends the number of gear ratios of the gearbox to: 1: 8, 1:44, 1:50, 1: 100, 1: 240.

At the junction of the housing 1 with the cover 4 and 5 and cable entries applied gaskets (not shown in Fig.) To protect against dust and moisture.

Explosion-proof limit switches VKV have an explosion-proof design and explosion protection mark 2ExedllBT4:

- explosion protection level “2” - “electrical equipment of increased reliability against explosion”;

- types of explosion protection - protection of type "e" according to GOST R 51330.8-99 and "flameproof enclosure" - "d" according to GOST R 51330.1-99.

Explosion protection level "2" - "electrical equipment of increased reliability against explosion" and types of explosion protection type "e" and

“Flameproof enclosure” - “d” is provided by the following basic measures and means:

- enclosing normally sparkling parts in a flameproof enclosure made in accordance with the requirements of GOST R 51330.1-99 and which has a high degree of protection against the risk of mechanical damage in accordance with GOST 51330.0-99, withstands explosion pressure and excludes the transfer of the explosion into the environment;

- the conclusion of non-sparking live parts in the shell of the inlet compartment, made in accordance with the requirements of GOST R 51330.0-99, which has a high degree of protection against the risk of mechanical damage;

- the implementation of contact electrical clamps in accordance with the requirements of GOST 10434-82, designed for a current density of not more than 2.5 A / mm2 and providing high reliability of contact;

- compliance of the electrical insulation of the product with level 1 according to GOST R 51330.8-99;

- the degree of protection of the shell from external influences 1P65;

- limiting the heating of the outer parts of the switch shell: the temperature does not exceed 135 ° C during normal operation;

- providing reliable cable sealing with an input device;

- the presence on the cover of the explosion protection marking and the warning inscription “Open, unplugged”;

- the presence of external and internal grounding clamps.

The proposed utility model in comparison with the prototype and other well-known technical solutions has the following advantages:

- expanding the number of gear ratios of the gearbox;

- a high degree of protection against the danger of mechanical damage;

- high reliability of contact;

- ensuring the safety of staff.

Claims (1)

Limit switch, comprising a housing with a cover in which a microswitch unit is installed, an input device, a lever connected to the camshaft through a gearbox, a screw, characterized in that the housing is equipped with a second cover, an input box with cable entries, parts of the microswitch unit that cause sparking during normal operation, enclosed in a flameproof enclosure of microswitches, and not causing arcing - in a enclosure with type “e” protection.