JPS5815794Y2 - Air conditioner operation circuit - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operating circuit for air conditioners such as packaged air conditioners and chiller units.

Generally, an air conditioner configures a refrigeration cycle by circulating a refrigerant through a compressor, a condenser, a pressure reducing device, and an evaporator.

Power supply to the compressor is controlled by a compressor electromagnetic switch.

That is, when the coil of the electromagnetic switch for the compressor is energized, the contactor of the electromagnetic switch is electromagnetically excited and the contact is closed, so that the compressor motor is energized and the compressor starts operating. The air conditioning function is achieved by exhausting heat from the condenser and absorbing heat from the evaporator in the refrigeration cycle.

When the power to the coil of the compressor electromagnetic switch is cut off, the electromagnetic switch is de-energized and the contacts are opened, so the compressor motor stops operating and the air conditioner stops.

Conventional air conditioners have been controlled by either an automatic return type or a manual return type operating circuit, as shown in FIGS. 1 and 2.

Figure 1 shows an automatic return type.

After automatic operation (in the test, when the start switch 1 is closed, as long as the contact 2 of the safety device is closed, the coil 3 of the time-limited relay is energized, and after a certain -0 hour, the time-limited relay's time-limited contact 4 is turned on.
is closed, the coil 5 of the electromagnetic switch for the compressor is energized, and the compressor is operated.

If the contact 2 of the safety device opens in this state, the power to the electromagnetic switch for the compressor is renewed, the operation of the compressor is stopped, and the power to the coil 3 of the time-limited relay is cut off, and the time-limited contact 4 is turned off. Becomes a wanderer.

If the safety device O-contact 2 is automatically restored and closed, the compressor starts operating again after a certain period of time has elapsed.

On the other hand, in the manual return type, once the contact of the safety device is opened by the self-holding circuit, operation will not be performed unless the start switch 1 is closed again.

That is, as shown in Fig. 2, when the starting switch 1 is closed, as long as the contact 2 of the safety device is closed, the coil 6 of the auxiliary relay is energized, and its A contact is closed, so when the starting switch is opened, the auxiliary relay coil 6 is energized. Since the coil 6 of the auxiliary relay continues to be energized and the coil 5 of the compressor electromagnetic switch is energized, the compressor operates.

When contact 2 of the safety device opens, the coil 60 of the auxiliary relay
Since the current is cut off and the A contact is opened, even if the contact 2 of the safety device is closed again, the compressor electromagnetic switch is not energized.

In other words, it is a manual reset type, and the starting switch must be closed in order to operate again.

In both the automatic return type operating circuit and the manual return type operation circuit, when the contact 9 of the temperature controller is opened, the current to the coil 3 of the time-limited relay is cut off, and its time-limited contact 4 is opened, causing the compressor to shut off. stops.

When the temperature rises and the contact 9 of the temperature regulator is closed again, the coil 3 of the time-limited relay is energized, and after a certain period of time, the time-limited contact 4 is closed and the compressor starts operating.

The conventional operation circuit described above has the following problems.

Manual return type circuits are used in installation situations where the air conditioner can be sufficiently maintained, and are used to constantly manage the safety and operating status of the air conditioner. It is used in places where sufficient maintenance is not possible, and when you want to use the air conditioner until it breaks down.

However, manufacturing two types of air conditioners by forming the operation circuits of the air conditioners differently depending on the application not only results in incompatibility, but also leads to a large amount of inventory, resulting in a large amount of waste.

It is an object of the present invention to solve the above-mentioned problems and provide an operating circuit that can be changed between a manual return type and an automatic return type operation circuit by simply changing the wiring.

The key point of this invention is to create an operating circuit that can be changed to either a manual return type or an automatic return type.
When the safety device, temperature controller, and start switch are connected in series, the A contact of the auxiliary relay is connected in parallel to the B contact of the time limit relay, and the coil of the time limit relay is connected in parallel to the above safety device, the manual It is a return type invitation circuit, and when connected in series, it is configured to become an automatic rear band type operation circuit.

An embodiment of the present invention is shown in FIG.

When the start switch 1 is closed, as long as the contact 2 of the safety device is closed, the time-limited A contact 8 of the time-limited relay is closed, so the coil 6 of the auxiliary relay is energized, and its A contact is closed.
The auxiliary relay remains energized even if the time-limiting contact 8 of the time-limiting relay becomes open.

On the other hand, since the coil 3 of the time relay is also energized, after a certain period of time, the time limit contact 8 opens and at the same time the time limit a contact 4 closes, so that the coil 5 of the compressor electromagnetic switch Electricity is applied and the compressor operates.

When one of the coils 3 of the time-limited relay is connected in parallel with the contact 2 of the safety device, the contact 2 of the safety device opens and the energization to the coil 6 of the auxiliary relay is cut off, but the coil 3 of the time-limited relay Even if the contact 2 of the safety device closes again, the contact 8 remains open, so the coil 6 of the auxiliary relay is not energized, and therefore the electromagnetic switch for the compressor The coil 5 is not energized and the compressor is not operated.

To start operation again, the starter switch must be opened and closed again.

In other words, it becomes a manual return type operation circuit.

If one of the coils of the time-limited relay is connected in series with the contact of the safety device, contact 2 of the safety device (indicated by a broken line)
When the relay is opened, both the auxiliary relay coil 6 and the time-limited relay coil 3 are de-energized, and the operation is stopped. However, when the safety device contact 2 closes again, the time-limited contact 8 is closed. Therefore, the coil 6 of the auxiliary relay is energized, and its a
Since the contact 4 is closed, even if the time-limiting contact 8 is opened, the coil 5 of the compressor electromagnetic switch is energized, so the compressor operates.

In other words, it becomes an automatic return type operation circuit.

In either the automatic reset type operation circuit or the manual reset type operation circuit, when the room temperature drops and the temperature controller contact 9 opens, the auxiliary relay coil 6, the compressor electromagnetic switch coil 5, and the time limit relay are activated. The power to the coil 3 is cut off, and the compressor stops operating.

When the room temperature rises and the contact 9 of the temperature regulator is closed again, the coil 6 of the auxiliary relay and the coil 3 of the time-limited relay are energized, and after a certain period of time, the time-limited contact 4 of the time-limited relay is closed.
is closed, the coil 5 of the compressor electromagnetic switch is energized and the compressor is operated again.

According to the present invention, there are the following effects.

(1) The automatic return type and manual return type operation circuits can be changed by simply changing the wiring, so either one can be selected depending on the installation location.

(2) Easy wiring changes can be made on-site between automatic return type and manual return type.

(3) Compatibility of operating circuits for air conditioner models is improved, and there is no need to design different operating circuits depending on the installation environment and usage, and the number of models can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a conventional automatic return operating circuit, FIG. 2 shows a conventional manual return operating circuit, and FIG. 3 shows an operating circuit according to the present invention. 1...Start switch, 2...Contact of safety device, 3...Coil of time-limited relay, 4...
... Time-limited contact a of time-limited relay, 5... Coil of electromagnetic switch for compressor, 6... Coil of auxiliary relay, I... Time-limited contact of auxiliary relay. Contact point, 8...
. . . Time-limiting relay contact, 9 . . . Temperature controller contact, 10 . . . Stop switch.

Claims (1)

[Scope of utility model registration request] It has a refrigeration cycle in which a compressor, a condenser, a pressure reducing device, and an evaporator are connected in series to circulate a refrigerant, and the refrigeration cycle is operated using a starting switch, a temperature controller, a safety device, a time relay, an auxiliary relay, etc. In the operation circuit of the air conditioner to be operated, the a-contact and b-contact of a time-limited relay are connected in series to the electromagnetic switch coil for the compressor; a safety device, a temperature controller, and a start switch are connected in series, and the b-contact of the time-limited relay is connected in series. When the A contact of the auxiliary relay connected in series with the time relay is connected in parallel to the B contact of the time limit relay, and the coil of the time limit relay is connected in parallel to the above safety device, it becomes a manual reset type operation circuit, and it is connected directly. Shitogi is an air conditioner operating circuit characterized by an automatic return type operating circuit.