SU960761A1 - Device for regulating air thermodynamic parameters - Google Patents

Description

The invention relates to an air-conditioning technique and can be used to automatically control two interrelated thermodynamic parameters of air — temperature and relative humidity.

It is known a semiconductor device for controlling air temperature, containing a temperature-sensitive resistive bridge as a measuring element. In this device, the regulation is carried out according to the signal of unbalance of the thermo-resistive bridge, which enters through the circuit {eg, to the executive mechanisms of air conditioning | 1.

However, the device does not provide a sufficiently high control accuracy.

Closest to the invention is a semiconductor air temperature regulator containing a measuring bridge connected in series, a pre-amplifier, an AC amplifier connected through a phase-sensitive stage with two switching blocks and

corresponding to them two electromagnetic, relay 2.

The device does not provide a high accuracy of stabilization of the set parameters of temperature and relative humidity, since the adjustment process does not take into account the peculiarities of setting the position controllers and the relationship between the thermodynamic parameters.

The aim of the invention is to improve the accuracy of the device.

The goal is achieved by the fact that in the device for regulating

15 air thermodynamic parameters containing a measuring bridge connected in series, an amplifier stage, a phase-sensitive stage, the first switching element

20 and the executive heating relay, as well as the second switching element connected in series, the input of which is connected to the second output of the phase-sensitive cascade, and the master cooling relay, and the third switching element and the humidity connecting actuator connected in series, an amplifier with a dead zone and a block memory

Claims (3)

A 30 input connected to the second output of the third switching element, and an output to the second (input of the first switching element), the amplifier with the dead zone being connected to the input stage, and the output to the input is a third of its switching element. . The drawing shows the structural scheme of the proposed device. I The device contains a measuring bridge 1 connected in series, a yc filter cascade 2, a phase-sensitive cascade 3. The first output of the phase-sensitive cascade 3 is connected to the first switching element 4 connected to the heating control relay 5, and the second output to the second switching element 6 connected with cooling actuating relay 7. The amplifier 8 with a dead zone input is connected to the output of the amplifier stage 2, and the output - to the third switching element 9, to which the humidity control relay 10 is connected, and the second output of the switching element 9 is connected to the input of the 11 pshshi unit, the output of which is connected with the first switching element 4. In the device, 11 triggers are used as switching elements 4, 6 and 9. The device works in the following way. If the air temperature of the conditioned room corresponds to the set parameters at the outlet of the measuring bridge 1 is absent. Signals are also absent at all subsequent stages of the device. Electrical windings (the relay relays 5.7 and 10 are in a de-energized state, the normally open contacts of the power relay relays 5 and 7 are in the open state, the normally closed contacts of the relay 10 are in if the temperature deviation is small, a signal appears from the preset value in the direction of increasing at the output of measuring bridge 1. A signal that does not reach the threshold for triggering amplifier 8 with the dead zone. neither the amplifier cascade 2 enters the input of the phase-sensitive cascade 3 and amplifies 8 with the dead zone.At the first output of the phase-sensitive cascade 3, a signal is generated that arrives at the first input of the switching element 4, which, when switching to another steady state, forms a control signal The input of the electromagnetic relay 5, as a result of which the short-circuited SRPMaN contacts of the relay 5 occur. In this case, the signal S at the output of the amplifier -8 with the dead zone is absent, the switching element 9 st This condition does not change and the electromagnetic relay 10 is de-energized. With a large deviation of the temperature JH-OT-eadan "th value at the input of the amplifier 8 with the deadband, the threshold is triggered by a signal that, after amplification, goes to the input of the switching element 9,. The transition to another stable state, the switching element 9 sends The first output impulse to the input of the electromagnetic relay 10, which causes the normally closed contacts of the relay 10 to open, thus breaking the relative humidity control circuit. From the second output of the switching element 9, the signal is fed to the input / memory of the memory block 11, and the output state of the block does not change. . When the temperature in air condition deviates from the preset to decrease, a control signal is formed at the second output of the fire sensitive stage 3 and enters the input of the switching element 6, which causes the contact of the electromagnetic relay 7 to close. As a result of the adjustment, the temperature value approaches the set value the signal is stopped and the output of the amplifier is 8 with the dead zone, which causes the switching element 9 to go to the closed state, causing Opening the contacts of the electromagnetic relay 10 and triggering the memory block 11. From the output of the memory block 11., the signal goes to the input of the switching element 4, which puts it in the closed state, as a result of which the contacts of the relay 5 unclock. the values of and by counting the ratio of dead zones of the control loop for temperature and in the chain of blocking of relative humidity, taking into account the dynamic characteristics of the object rso-regulation. The moment of the signal at the output 3 a phase-sensitive de cascade controlled vyborsm .napr c1 yuscheni voltage amplifier. 8. This allows the output of the temperature control loop and the relative humidity control locking circuit to obtain different deadband values for the temperature control process. The introduction of the memory unit and the amplifier with the dead band improves the accuracy of the device, thereby improving the quality of control of the interrelated thermodynamic Air Parameters Formula of the Invention A device for adjusting the thermodynamic parameters of air, comprising series-connected a measurement bridge, an amplifier cascade, a phase-sensitive cascade, a first switching element and a heating control relay, as well as a second switching element connected in series, the input of which is connected to the second output of the phase sensitive garden, and an operating cooling circuit and series-connected The third switchable & element and the humidity control relay is characterized in that, with 11 devices for improving the accuracy of the device, it contains an amplifier with a dead zone and a memory unit, the input is connected output to the second output of the third switching element and the output - to the second input of the first re 1slyuchakitsego member, wherein u.silytel dead band input zgsh communication with the outlet of the amplifier stage and the output of the third switching elemeita - the entrance. Sources of information taken into account in the examination. 1. Author's certificate of the USSR 710030, cl. G 05 D 23/19, 1977. 2. Semiconductor temperature controller three-position MFR 3. Technical description. Orlovsky Instrument Plant, 1973 (prototype). . I YU iJi I, & eight