JPS5842818Y2 - air conditioner - Google Patents

Description

[Detailed description of the invention] This invention relates to an air conditioner in which an air filter is provided in front of the heat exchanger and a fan is provided in the rear of the heat exchanger, and it is possible to perform single-motion defrosting operation with a simple configuration. The purpose is to

Next, this invention will be explained in detail with reference to drawings showing embodiments thereof.

As shown in FIG. 1, in an outdoor unit of a heat pump air conditioner, etc., an air filter 2 is provided in front of a heat exchanger 1, and a fan 3 is provided behind the heat exchanger 1.
A box body 4 is provided between the heat exchanger 1 and the fan 3, through which air flows when the fan 3 is driven, and a box body 4 is provided above the interior of the box body 4, when the detected temperature exceeds the set temperature. A temperature sensor 5 such as a thermostat that emits an alarm signal is provided, and a heat radiating body 7 such as a heat radiating coil that is connected to a heat source 6 such as electricity, gas, or high-temperature refrigerant and has a constant amount of heat radiated per unit time is installed in the box 4. A heat radiator 7 is provided in the lower part of the interior and located near the temperature sensor 5.

Note that the set temperature of the temperature sensor 5 is determined based on the allowable amount of clogging and the allowable amount of frost formation.

When the fan 3 is driven, air flows as shown by the arrow, and the air filtered by the air filter 2 is transferred to the heat exchanger 1.
The heat-exchanged air is then released to the outside.

At this time, part of the heat-exchanged air passes through the box 4,
In order to remove most of the heat emitted from the heat sink 7, the temperature around the temperature sensor 5 is maintained at a low temperature.

Next, when the clogging of the air filter 2 becomes large or the frosting of the heat exchanger 1 progresses, and the amount of air passing through the heat exchanger 1 decreases, the air passing through the box body 4 becomes Since the amount of heat removed by the air also decreases, and the amount of heat radiated from the heat sink 7 is constant, the temperature around the temperature sensor 5 increases, and the temperature sensed by the temperature sensor 5 also increases.

When the sensed temperature becomes higher than the set temperature, the temperature sensor 5 issues an alarm signal T.

Therefore, when the air filter 2 is clogged, the alarm signal T lights up an alarm lamp or sounds an alarm buzzer to instruct the user that the air filter 2 is clogged.

By cleaning the air filter 2, the alarm signal T is canceled and a decrease in the air volume passing through the heat exchanger 1 is prevented, resulting in an adverse effect on the capacity of the heat exchanger 1 and a resulting low pressure drop in the refrigerant during cooling. , to prevent operation failure due to high pressure rise of refrigerant during heating.

In the case of frost formation during heating operation, the above-mentioned alarm signal is used to energize the defrosting device to defrost the air. To solve the problem that defrosting operation is performed due to a drop in outside temperature even though the outside temperature is not present.

Next, FIG. 2 will be explained.

In the figure, the same symbols as above indicate the same thing, 18
a and 18b are a first contact point and a second contact point provided vertically on one side of the upper part of the box body 4, and the first contact point 18a
is connected to a four-way valve actuator 16, and when the four-way valve actuator 16 is energized, the direction of circulation of the refrigerant of the heat pump type air conditioner is reversed and switched from heating operation to defrosting operation (cooling operation).

19a and 19b have a first one on one side of the upper center part inside the box body 4. They are a third contact and a fourth contact provided opposite to the second contacts 18a and 18b, respectively, and the third contact 19
a is connected to the fan actuator 17, and the fourth contact 19b is connected to the power source 11.
are connected to each.

20a and 20b are provided on the other side of the upper central part of the box body 4, and are the third contact 19a and the fourth contact 1, respectively.
9. Fifth and sixth contacts tangent to b, 21 a
, 21 b has a fifth . A seventh contact and an eighth contact are provided opposite to the sixth contacts 20a and 20b, respectively.The seventh contact 21a is connected to the power supply 11, and the eighth contact 21b is connected to the second contact 18b. It is connected.

22 and 23 are respectively the 1st. Second contact 18a, 18
b and 3rd. between the fourth contacts 19a and 19b and the fifth
．． The sixth contact points 20a, 20b and the seventh contact point 20a, 20b. 8th contact 21
A, 21B are a first bimetal and a second bimetal supported at the center, and the first bimetal 22 is designed to have a higher temperature and lower temperature than the second bimetal 23. is always number 1. Second contact 1
8a and 18b, and the second bimetal 23 is always in contact with the fifth
．． The second bimetal 23 contacts the sixth contacts 20a and 20b, and the second bimetal 23 contacts the fifth contact point 23 due to the temperature when the air volume corresponds to the allowable frost amount or more. Leaving the sixth contacts 20a and 20b,
7th. It comes into contact with the eighth contacts 21a and 21b.

Note that the high-temperature design means, for example, the second bimetal 23
However, at 50°C or higher, the 5th and 6th contacts 20a, 20b
Leave the 7th. Eighth contact point 21a.

21 When it comes into contact with b and then the temperature drops below 30℃,
Leaving the seventh and eighth contacts 21a and 21b, the fifth. 6th
When the first bimetal 22 contacts the contacts 20a and 20b, the first bimetal 22 contacts the contacts 20a and 20b. Second contact 18a, 18
b, comes into contact with the third contacts 19a and 19b, and then, when the temperature drops below 10°C, the third. Fourth contact 19a
, 19 b, leaving the 1st. Second contact 18a, 18
The first and second bimetals 22 and 23 are in contact with b.
The operating point is set.

Therefore, if the air fill 2 (no clogging occurs and the heat exchanger 1 is not frosted), a large amount of air flows through the box 4, and most of the heat radiated from the heat radiator 4 is taken away. , the temperature around the bimetals 22, 23 is low, and the first bimetal 22 is connected to the first and second contacts 18a, 18.
b, and the second bimetal 23 connects the fifth and sixth contacts 20.
A, 20B are connected, the fan actuator 17 is energized, the fan 3 is driven, and normal heating operation is performed.

Then, frost builds up on the heat exchanger 1, the amount of air passing through the heat exchanger 1 decreases, the amount of air passing through the box 4 decreases, and the temperature around the bimetal 22, 23 increases. , when the temperature reaches or exceeds the set temperature, the second bimetal 23 changes to the fifth.
It separates from the sixth contacts 20 a , 20 b and comes into contact with the seventh and eighth contacts 21 a , 21 b . 8th contact 2
Connect 1a and 21b.

At that time, since the first bimetal 22 has a higher temperature and lower temperature design than the first bimetal 23, the first bimetal 22 has a higher temperature and lower temperature design than the first bimetal 23. Second contact 18a,
18b continues to be connected, the power to the fan actuator 17 is stopped, and the four-way valve actuator 16 is energized, the drive of the fan 3 is stopped, and defrosting operation is performed.

Since the fan 3 stops and the heat radiator 7 radiates a certain amount of heat, the temperature around the bimetals 22 and 23 continues to rise constantly, and after a certain period of time, the surrounding temperature increases to the first bimetal 22. temperature at which the first bimetal 22 operates. Leaving the second contacts 18a, 18b,
Third. The fourth contacts 19a and 19b come into contact, stopping the power to the four-way valve actuator 16, and energizing the fan actuator 17, completing defrosting.

That is, the second bimetal 23 is the seventh bimetal. Eighth contact 21a
, 21b, the first bimetal 22 becomes the third bimetal 22.
The defrosting time is until the fourth contacts 19a and 19b are connected.

Therefore, both bimetal 2
2. Set the operating temperature of 23.

Next, when the fan 3 is driven, since there is no frost on the heat exchanger 1, a normal amount of air passes through the box 4, the temperature around both bimetals 22 and 23 decreases, and the heat exchanger 1 is not frosted. , the second bimetal 23 is the seventh bimetal 23. Eighth contact 21a, 21
Leave b, 5th. The sixth contacts 20a, 20b are connected, and then the first bimetal 22 is connected to the third... Leaving the fourth contacts 19a and 19b, the first. Second contact 18a
, 18 b.

During the operation, the third contact 19a, the fourth contact 19b, and the fifth contact
Since at least one of the contacts 20a and 6th contact 20b is connected, the fan actuator 1 is always connected.
7 is energized, and the fan 3 continues to drive.

Through the above operations, defrosting is performed and stable heating operation is performed without using a timer.

Note that the defrosting device is linked to a cooling/heating changeover switch of the air conditioner so that it operates only during heating operation in winter or the like.

As described above, according to the air conditioner of this invention, the air filter provided in the front of the heat exchanger, the fan provided at the rear of the heat exchanger, and the space between the heat exchanger and the fan. a box body provided in the box body through which air circulates inside by the drive of the fan; a heat radiator provided at the bottom of the box body and having a constant amount of heat dissipated per unit time; and a heat radiator provided vertically on one side of the top part of the box body. a first contact and a second contact, and the first
A four-way valve actuator is provided between the contact point and one end of the power source and reverses the circulation direction of the refrigerant when energized to switch from heating operation to defrosting operation, and the first
．． a third contact and a fourth contact provided opposite to the second contact, a fan actuator for the fan provided between the third contact and one end of the power supply, and a a fifth contact and a sixth contact provided on the other side of the central portion and tangential to the third contact and fourth contact, respectively;
On the other side of the upper part of the box, the fifth. a seventh contact and an eighth contact provided respectively opposite the sixth contact; and a seventh contact and an eighth contact respectively provided opposite the sixth contact. The second contact point and the third contact point. between the fourth contact point and the fifth contact point. 6th contact point and 7th contact point. a first bimetal and a second bimetal provided between an eighth contact, the second contact being connected to the eighth contact, and the fourth contact and the seventh contact being connected to the other end of the power supply. connection, and the first bimetal is always connected to the first bimetal. contact with the second contact point, and the second bimetal is constantly connected to the fifth contact point. abuts on the sixth contact, and the second
Bimetal is the fifth. The seventh and eighth contacts leave the sixth contact point.
At a high temperature equal to or higher than the temperature at which the first bimetal contacts the contact point, the first bimetal contacts the first bimetal. The third contact point is removed from the second contact point. The second bimetal is set to come into contact with the fourth contact, and the second bimetal is set to contact the seventh contact. The fifth contact point is removed from the eighth contact point. At a low temperature below the temperature at which it contacts the sixth contact, the first bimetal leaves the third and fourth contacts and the first bimetal separates from the third and fourth contacts. By setting it to contact the second contact, clogging of the heat exchanger due to frost formation can be detected with a simple device, inexpensively and reliably, and the detected alarm signal can be used to perform automatic defrosting operation. can.

Furthermore, the temperature sensor can be configured in a small size and can be applied to all air conditioners with different capacities.

[Brief explanation of drawings]

The drawing shows one embodiment of the air conditioner of this invention.
The figure is a schematic diagram, and Figure 2 shows the detailed constituent countries. 1...Heat exchanger, 2...Air filter, 3...Fan, 4...Box, 5...
... Temperature sensor, 7 ... Heat sink, 11 ...
...Power supply, 16...Four-way valve actuator, 17.
...Fan actuator, 18 a, 18 b, 19
a, 19 b, 20 a, 20 b, 21 a. 21 b... 1st. Second. Third. 4th. Fifth.
6th. 7th. 8th contact, 22.23...1st.
Second bimetal.

Claims (1)

[Scope of utility model registration request] an air filter provided on the front side of the heat exchanger, a fan provided on the rear side of the heat exchanger, and an air filter provided between the heat exchanger and the fan, through which air circulates through the interior when the fan is driven. a box body, a heat radiator provided at a lower part of the box body and having a constant amount of heat dissipated per unit time, a first contact point and a second contact point provided vertically on one side of the upper part of the box body, and the first contact point A four-way valve actuator is provided between the contact point and one end of the power source and reverses the circulation direction of the refrigerant when energized to switch from heating operation to defrosting operation, and the first four-way valve actuator is provided on one side of the upper central part of the box body. a third contact and a fourth contact provided opposite to the second contact, a fan actuator for the fan provided between the third contact and one end of the power supply, and a A fifth contact point and a sixth contact point are provided on the other side of the center portion and are tangential to the third contact point and the fourth contact point, respectively, and a fifth contact point and a sixth contact point are provided on the other side of the upper part of the box body. a seventh contact and an eighth contact provided opposite to the sixth contact, respectively;
Each of the above 1. The second contact point and the third contact point. between the fourth contact point and the fifth contact point. 6th contact point and 7th contact point. comprising a first bimetal and a second bimetal provided between the eighth contact point,
the second contact is connected to the eighth contact, the fourth contact and the seventh contact are connected to the other end of the power supply, and the first
The bimetal is always kept in the first position. contact with the second contact point, and the second bimetal is constantly connected to the fifth contact point. The second bimetal contacts the fifth contact. said seventh, leaving the sixth contact;
At a high temperature equal to or higher than the temperature at which the first bimetal contacts the eighth contact, the first bimetal contacts the first bimetal. The third contact point is removed from the second contact point. The second bimetal is set to abut the fourth contact, and the second bimetal is set to abut the seventh contact. The fifth contact point is removed from the eighth contact point. At a low temperature below the temperature at which it contacts the sixth contact, the first bimetal separates from the third and fourth contacts. An air conditioner set to come into contact with the second contact.