SU1041819A2 - Device for automatic protection of air heater against freezing - Google Patents

Abstract

DEVICE AUTOMATIC PROTECTION OF THE HEATER FROM {FREEZING on author) St. No. 765604, distinguished by the fact that, in order to increase the reliability of the protection of the calorifier, the intermediate relay is made: with an additional normally open: Timing contact, having an open and amp on open circuit, is connected respectively to the power supply circuit magnetic motor starter fan. SP 4 ;: 00 co

Description

This invention relates to the regulation of ventilation and air conditioning systems. By main & aut. 9B. Mb 765604 jisBecTHo automatic anti-freeze heater unit containing an outdoor air temperature sensor / switch, control valve installed on the heat transfer pipe with an electric drive having control windings, intermediate p & le, in the circuit whose power supply is connected to the temperature switch sensors the outside air temperature sensor of the return heat medium, the contact of which is connected in parallel with the sensor contact of the outdoor air temperature, the intermediate relay is normally open This contact is included in the power supply circuit, one of the windings, and the normally closed contact is included in the power supply circuit of the other winding of the last 3 ". A disadvantage of the known device is low reliability of the protection of the heater against freezing. The purpose of the invention is to increase the reliability of the calrrifer zzzhshty. The goal is achieved by fe arrangement with an outdoor temperature sensor, a regulating valve installed in the pipeline of an electrically driven heat carrier — having a control winding, an intermediate relay, in the supply circuit of which there is a sensor contact — an external temperature switch, sensor -the temperature switch of the return heat medium, the contact of which is connected parallel to the contact of the sensor-relay flow sensor of the outdoor air, the intermediate relay has a normally open contact; A normal but closed contact is connected to the power circuit of the other winding of the latter, the intermediate relay is wired with an additional normally open contact having a pin. time when disconnected, connected in series to the power supply circuit of the magnetic actuator electr p0 (fan fan. Fig. 1 shows the principle: technological scheme of the proposed device; Fig. 2 shows its principle on the electrical circuit. The device includes a temperature sensor-relay 1 external air regulating 1 valve 2 with electric drive 3, having control windings 4 and 5, intermediate relay 6, in whose supply circuit there is a contact 7 sensor 1 for outdoor air temperature, sensor 8 relay of return temperature The cosmonidizer, pin 9 of which is parallel to pin 7, is a sensor for an external-air temperature switch, intermediate relay 6 has a normally open contact 10 connected to the power supply of one of the drive windings, and a normally closed contact 1.1 is connected to the power circuit of the other winding of the latter. 6 is completed with an additional normally open contact 12 having a time delay, when opened, connected in series in the circuit of the magnetic actuator 13 of the electric motor 14 of the ventilator 15, In addition, the device contains t heater 16, automatic switch 17 connected to the mains, button; 18 Stop, start button 19, close contact 2O of the magnetic pupotel 13, which together with temporary contact 12 forms a blocking circuit of the start button, opening contact 21 of the magnetic starter, form. The power supply circuit of the windings of the actuator and 3 of the control valve 2, pins 22, 23. and 24 of the actuator, connects the power supply network to the electric motor 14 of the fan 15 and the p & 25 room air temperature. The device works as follows: At outside air temperature. . the sensor-relay 1 of the external air temperature closes its contact 7 and opens it at a temperature below 3 ° C. When the temperature of the return body is higher than 20 ° ZO ° C, the sensor 8 of the reverse heat carrier closes its KOHTiaKT 9 and opens it if the temperature is below the specified temperature - ° C. During normal operation of the ventilation system, the circuit breaker 17 and the actuator 13 are turned on, the main contacts 22,23 and 24 of the starter are closed, the closing contact 20 is closed, the opening contact 21 is open, the belt contact 12 is closed, the electric motor 14 of the fan 15 is turned on. The actuator 3 of the regulatory authority is connected to the controller 25 temp.

Ratury that controls the work of the p & -. 17ЛЩ)) a 10yogo valve 2 ,.

If the temperature of the outside air is signified, and the temperature is shunn for some reason, it will remain 5 s less than 2 ° -30 ° C, i.e. if it comes; the threat of freezing of the heater, dap i outdoor tekleuraty in the spirit of raarmknetkontakt 7, sensor | pc relay; 8 Femperat} fy b of the coolant to will also open the contact 9 6 of the current de-energization,. /:

. Its contact 11 is closed, contact 10 is opened, the terminal contact 12 is within a predetermined time and also is closed by breaking the self-locking circuit of the magnetic actuator 13. Starter 13 is turned off and opens its main-; contacts 22, 23 and 24, contact 2O: also opens, contact 21 closes - 20 s, the motor 14 of the fan 15 stops. At 9th time, at a time 21, the magnetic actuator 13 and cootact 11 in line 6. will come to the winding

I k 4 OTFIGA of electric drive-3, and the regulating valve 2 is completely disconnected and the coolant enters the heater. .: /

As soon as the return temperature of the coolant exceeds the preset, time of sensor 9, the relay B of the return heat medium closes, the current. A contact 6 arrives at the relay 11, which is opened, and the contact 1O locks. At the same time, the current will go to the "winding 5" to close the electric drive of the fork 3 of the regulating valve 2, which will allow the heat-transfer agent to enter the heater,

 -. . . ..

When cooling the heater to a temperature lower than 2 OS of contact 9 of the sensor to relay 8 is opened again, the relay closes and the actuator 3 will receive a opening coder,

The proposed device ensures reliability of the sewn up kalrvv: the server from freezing, both when the fan is working and not working.

Claims (1)

DEVICE OF AUTOMATIC- ^: CLEAN PROTECTION OF THE HEATER FROM • FREEZING by ed. St. No. 765604, with the exception that, in order to increase the reliability of sewing) a heater, an intermediate relay is made with an additional normally open contact having a time delay when opened, connected in series to the magnetic fan motor starter. • 1041819