SU1305511A1 - Twin pressure relay of refrigerating unit - Google Patents

Abstract

The invention relates to refrigeration technology and can be used in automatic and automated systems for controlling, controlling and regulating the suction pressure and discharge pressure of refrigeration compressors. Purpose 1 of the invention is to increase the operational reliability by increasing the vibration resistance and improving the tuning accuracy during manufacture. The drive element is provided with a spring-loaded button 18 and is connected with it by a threaded connection by a sleeve 19. Such an embodiment of the threaded connection does not need to be locked due to the presence of a spring 20 and eliminates resonance during low-frequency vibration. The executive lever is provided with an eccentric roller mounted on the side, a counter-1 false button 18. 1 Cp f-ly. 3 il. i (L 00 about SP ate 10

Description

The invention relates to refrigeration technology and can be used in automatic and automated systems for controlling, controlling and regulating the suction and discharge pressures of refrigeration compressors.

The purpose of the invention is improving operational reliability by increasing vibration resistance and increasing the tuning accuracy in the manufacture of

FIG. Figure 1 shows the principle of the kinematic circuit of the pressure switch; in FIG. 2, a relay, general view; in fig. 3 - the same, side view.

The dual pressure switch contains a low pressure sensor, consisting of a bellows unit 1, a balance spring lever 2j 3, a setpoint 4 and a panel 5, a return zone setting unit for a low pressure sensor consisting of a lever 6, a spring 7 and setter. 8 tension, high pressure sensor, consisting of bellows 9, enclosed in case 10 and loaded with external pressure, drive lever 11, panel 12, action lever 13, transmitting force from. a lever 11 on a drive element 14 of a microswitch 15, a balance spring 16 and a setpoint 17 of a hectare; a mechanism for controlling the interaction of a low pressure sensor with a drive of a microswitch containing a button 18, a sleeve 19 and a spring 20,

The device works as follows

 When the pressure in the low pressure sensor decreases, the bellows unit 1 is pulled out, the lever 2 moves downwards under the action of the spring 3, and the end of the lever 2 carries away the lever for adjusting the return zone setting. The lever 6 is turned counterclockwise until it stops, after which the lever 6 together with the spring 7 in the kinematic chain is turned off. Upon further downward movement of the lever 2, the button 18 moves away from the drive element 14 of the microswitch 15 and the contacts of the microswitch 5 are switched. When the pressure in the low pressure sensor increases, the lever 2 rotates counterclockwise and the button 18 comes into contact with the drive element 14 of the microswitch 15, however the presence of the microswitch 15 of its own stroke, the switching of the contacts occurs only after passing

lever 2 of a certain distance at which it comes in contact with lever 6 and overcomes ADDITIONAL tension of spring 7 of the setting unit, return zone. With increasing

pressure in the low pressure sensor by an amount determined by the tensioner 8, reverse switching of the contacts takes place. When this spring 20 holds the button 18 in the pressed position. When the pressure in the high pressure sensor increases, the chag 11, breaking the tension of the spring 16, turns the lever 13 counterclockwise, which presses

the drive element 14 of the microtransmitter 15, together with it the button 18 and the sleeve 19 move aside, overcoming the tension of the spring 20. As a result, the contacts of the microswitch Tel 15 size: open. Under reduced pressure in the high pressure sensor, the lever 13 rotates clockwise, while the drive element

14, the micro switch 15, the button 18 and the sleeve 19 return to their original position, which leads to the reverse switching of the contacts of the micro switch 15.

Alternatively, it is possible to install an eccentric roller at the end of the actuating lever 13 for factory adjustment. In this case, the factory adjustment

the relative position of the high pressure sensor and microswitch

15 is carried out directly on the drive element 14 of the microswitch 15 as well as the adjustment of the low pressure sensor, for which it is necessary to screw or unscrew the button 18 in the sleeve 19.

Claims (2)

1. A dual pressure switch of a refrigeration unit, comprising a housing, high and low pressure sensors installed in it, and a microswitch with a drive element that is kinematically connected with a low pressure sensor and a lever mechanism with a high pressure sensor, characterized by that. that, in order to improve operational reliability by increasing vibration resistance and improving tuning accuracy during manufacture, the microswitch drive element is provided with a spring-loaded button and associated with it through a threaded connection a sleeve that is freely installed in a groove made in the lever of the low pressure sensor, and a spring the buttons are supported on the low pressure lever and the lever ZG The mechanism of the high pressure sensor is made of two kinematically interconnected levers — drive and actuator. 2. Relay according to claim 1, characterized in that the actuating lever of the lever mechanism of the high pressure sensor is provided with an eccentric roller mounted near the drive element of the microswitch on the side opposite to the button. 5 -./5 FIG Editor O. Bugir Compiled by V. Dobrovortsev Tehred V. Kadar Proofreader L. Patay Order 1419/38 Circulation 476 VNIIGI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Subscription