JPS589729Y2 - air conditioner - Google Patents

Description

[Detailed description of the invention] This invention relates to an air conditioner equipped with an electric heater for heating, and its purpose is to use a dedicated control device to collect residual heat from the electric heater when the heating operation is stopped. An object of the present invention is to provide an air conditioner that can reliably cool the electric heater without causing overheating, and can easily and reliably prevent overheating of parts surrounding the electric heater.

Generally, in this type of air conditioner, when the heating operation is stopped, if the electric heater and the indoor fan motor are turned off from the heating operation state, and the electric heater and the fan motor are immediately turned off and the operation is stopped, the residual heat of the electric heater will be removed. Therefore, there is a problem that the insulating parts around the electric heater are overheated and damaged, and if the surrounding parts of the electric heater are made of a special heat-resistant material to solve this problem, the cost will increase significantly. There's a problem.

However, in order to eliminate the above-mentioned problems, conventionally, in addition to connecting the heating switch of the operation switch to the indoor fan motor, a series circuit between the stop switch of the operation switch and a dedicated overheat protector was connected. When the heating operation is stopped using the stop switch, if the temperature of the parts surrounding the electric heater rises above a predetermined value due to the residual heat of the heater, the overheat protector is activated and the fan motor is activated to stop the electric heater and the heating operation. In order to cool down the surrounding parts of the heater, it was necessary to specially form an overheat protector that operated in this way and incorporate it into the electric circuit, which increased the number of parts used, complicated the structure, and increased man-hours. There was a problem that the number of parts increased and the cost became high.

The present invention was devised in view of the above problems, and utilizes the high temperature side contact of the overheat protector for the electric heater for heating to connect the high temperature side terminal and normal terminal of the overheat protector to the terminal of the stop switch and the heating operation. By inserting it into the connection circuit between the terminal and the connection point of the indoor fan motor, it is possible to prevent the temperature around the electric heater from rising above the specified temperature when heating operation is stopped, without using a special overheat protector. When the temperature rises, the high-temperature side terminal and the normal terminal of the overheat protector are connected, and the indoor fan motor is operated, thereby ensuring that the electric heater and the parts surrounding the heater are prevented from overheating.

That is, the present invention makes it possible to reliably cool the electric heater and the surrounding parts of the heater to a predetermined temperature or lower when the heating operation is stopped without using a dedicated overheat protector. An indoor fan motor is connected to the first contact, an electric heater for heating is connected to the second contact, and the connection circuit of the heater is connected to the low-temperature side terminal of the desuperheater, and the normal terminal of the desuperheater is connected. is connected to the connection point between the first contact and the indoor fan motor, and the high temperature side terminal is connected to a stop switch in the operation switch, so that when heating operation is stopped, the indoor fan motor is activated by the operation of the overheating preventer. It is characterized by being made to operate as if it were activated.

Embodiments of the present invention will be described in detail below based on the drawings.

In the drawing, 1 is a rotary type operation switch,
The operation switch 1 has a first connection terminal T11°T12 and a second connection terminal T11°T12.
Connection terminal T21. T22. ..., fifth connection terminal T51. Equipped with a set of five types of T52 connection terminals,
It has six types of switches: a heating switch 2, a blower switch 3, a stop switch 4, a blower switch 5, a high cooling switch 6, and a low cooling switch 7. By operating the six types of switches 2, 3. ......, when you operate the desired switch among 7, the following 5 types of connection terminals T11.
T12. T21. , T 22. ......, T5
1. Among the sets of T52, the terminals of a predetermined set corresponding to the operated switch are in a conductive state.

That is, the heating switch 2 has the second connection terminal T21°T22.
between the first contact 8 and the fourth connection terminal T41. 2nd between T42
By operating this heating switch 2, both the first and second contacts 8, 9 are closed, and the second contact point 9 is closed.
．． Fourth connection terminal T21. T22. T41, T4
The two become electrically conductive.

The stop switch 4 is connected to the third connection terminal T31°T3.
A contact 10 is provided between 2 and 2, and by operating this stop switch 4, the contact 10 is closed and the third connection terminal T3 is opened.
1. The connection between T32 becomes conductive.

Note that when the blower switch 3 or 5 is operated, the second connection terminal T21. Only between T22 becomes conductive, and when the cooling high switch 6 is operated, the second. Fifth connection terminal T 21 , T 22 . T51.

When T52 are brought into conduction state and the cooling weak switch 7 is further operated, the first. Fifth connection terminal T 11
．． T12. Thus, conduction occurs between T 51 and T 52.

Reference numeral 11 denotes an electric heater for heating, and during heating operation, the amount of heat generated from the electric heater 11 is released into the room by an indoor fan (not shown) operated by the indoor fan motor 12 to heat the room. be.

Further, 13 is a compressor motor, 14 is an indoor temperature controller, and the fifth connection terminal T51. The compressor motor 13 and the indoor temperature controller 14 are connected to the terminal T52 of the pair of T52.
The high temperature side terminal 15 of the operation switch 1 is connected to the power line L1 of the power supply lines Ll and L2, and the normal terminal 16 of the indoor temperature controller 14 is connected to the power supply line L2. When the cooling high switch 6 or the cooling low switch 7 of No. 1 is activated, if the indoor temperature rises above a predetermined temperature, the indoor temperature regulator 14 operates so that the normal terminal 16 and the high temperature side terminal 15 are electrically connected. Thus, the compressor motor 13 is driven.

Note that QC and OL are an overcurrent relay and overload protection device for the compressor motor 13, and TF is a temperature fuse.

However, in the air conditioner shown in FIG. Connect the normal terminal 18 of the overheat protector 17 to the connection circuit, and
Connecting the terminal T32 connected to the contact 10 of the stop switch 4 in the operation switch 1 to the high temperature side terminal 19,
The low temperature side terminal 20 is connected to the terminal T42 connected to the second contact 9 of the heating switch 2 via the heating heater 11, and the terminal T21. T31 to the power supply line L1, terminal T41 to the low temperature side terminal 21 of the temperature regulator 14, and terminal T of the indoor fan motor 12.
The terminal opposite to the terminal to which 22 was connected was connected to the power supply line L2.

Furthermore, the terminal T12 of the operation switch 1 and the indoor fan motor 1
The terminal T11 is connected to the power supply line L1.

In the air conditioner configured as described above, when the heating switch 2 is activated by operating the operation section of the operation switch 1, the power supply line L1 is connected to the terminal T21 of the operation switch 1. The electric heater 11. An electric circuit is formed that connects the terminal T42 of the operation switch 1, the second contact 9 of the heating switch 2, and the terminal T41 to the power supply line L2 via the indoor temperature regulator 14, and a predetermined amount of heat is radiated from the electric heater 11. On the other hand, the indoor fan motor 12 is also connected to the terminal T of the operation switch 1.
It is operated by forming a circuit connected to the power supply line L2 via the
The amount of heat from the electric heater 11 is released into the room by means of a blowing force (not shown), thereby heating the room.

The overheating preventer 17 is configured so that during the heating operation, the surrounding members of the electric heater 11 are
When it becomes heated more than necessary due to the heat generated by the electric heater 11, the electric heater 11 automatically switches to stop supplying electricity to the electric heater 11.
It operates to protect this peripheral member from being excessively heated.

In other words, the overheating preventer 17 is designed so that safety cannot be maintained unless the temperature detection part of the temperature detecting part is at a temperature below the safety limit temperature 01, such as an electrical component or an insulating member that has a particularly low safety limit temperature among the surrounding members of the electric heater 11. It is usually provided above the air outlet side of the electric heater 11.

During heating operation by the electric heater 11, when the detected temperature θ of this temperature detection section is a normal temperature θ2 lower than the temperature θ1, the normal terminal 18 and the low temperature side terminal 20 are connected to control the energization state of the electric heater 11. However, when the detected temperature θ rises to the set temperature θ2, which is lower than the temperature θ1, a switching operation is performed so that the normal terminal 18 and the high temperature side terminal 19 are connected, and the power to the electric heater 11 is cut off. The electric heater 11 operates in such a way that the surrounding members do not exceed the safe limit temperature θ1.

However, as described above, the overheat preventer 17 operates to cut off the power to the electric heater 11 when the surrounding members of the electric heater 11 are overheated to a predetermined temperature or higher by the electric heater 11 during heating operation. On the other hand, since the indoor fan motor 12 also stops when the heating operation is stopped, the electric heater 1
When the surrounding components become overheated due to the residual heat of step 1, the normal terminal 18 and the high temperature side terminal 19 are connected to operate the indoor fan motor 12, and electricity is generated by the air blown from the indoor fan. This ensures that the heater 11 and surrounding members are cooled.

That is, as shown in FIG. 2, the temperature θ detected by the temperature detection section of the overheat preventer 17 is the normal temperature θ.

During normal heating operation at time t1
When the operation switch 1 is operated to activate the stop switch 4 and stop the heating operation, the first switch of the heating switch 2 is activated. The second contacts 8 and 9 are both turned off, cutting off the electricity to the electric heater 11 and the indoor fan motor 12.

Therefore, when the detected temperature θ starts to rise due to the residual heat of the electric heater 11 and reaches the set temperature θ3, the overheat protector 17 switches to connect the normal terminal 18 and the high temperature side contact 19, and the indoor fan motor 12 is switched to the stop switch 4. The electric heater 11 and the surrounding parts of the electric heater 11 are cooled by the indoor fan, and the temperature exceeds the safe limit temperature θ1. When the temperature drops to a sufficiently low temperature at time t3, the overheat protector 17 switches again so that the normal terminal 18 and the low temperature side terminal 20 are connected, and the indoor fan motor 12 is stopped, safely stopping the heating operation. can be completed.

As described above, the present invention utilizes the high-temperature side contact of the overheat preventer, and when the temperature of the surrounding parts of the electric heater reaches the set temperature or higher when heating operation is stopped, a connection is made between the stop switch of the operation switch and the high-temperature side contact of the overheat preventer. Since the electric heater and its surrounding parts were reliably cooled by operating the indoor fan motor, there was no need to use a special overheat protector for the electric heater's surrounding parts, and the electric circuit It also has a simple structure, requires less man-hours, and can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the operation. 1... Operation switch, 2... Heating switch, 4... Stop switch, 8... First contact, 9... Second Contact, 11... Electric heater for heating, 12... Indoor fan motor, 17... Overheat protector, 18... Regular terminal, 19... ...High temperature side terminal, 20...Low temperature side terminal.

Claims (1)

[Scope of utility model registration request] Connecting the indoor fan motor to the first contact of the heating switch in the operation switch, connecting the electric heater for heating to the second contact, and connecting the connection circuit of the heater to the low temperature side terminal of the desuperheater, The normal terminal of the overheating preventer is connected to the connection point between the first contact and the indoor fan motor, and the high temperature side terminal is connected to a stop switch in the operation switch, so that the overheating preventer operates when heating operation is stopped. An air conditioner characterized in that the indoor fan motor is actuated by: