JP3074026U - Indoor ventilation control device for air conditioner - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To maintain the blow-out temperature at the start of the heating operation at a more stable constant temperature by controlling the switching of the four-stage operation of the indoor fan more finely. SOLUTION: A conduit temperature sensor 7 for detecting a conduit temperature of an indoor side heat exchanger, and a conduit temperature sensor 7 when a heating operation is started.
And an operation control unit 22 for controlling the operation of the indoor fan 31 based on the conduit temperature detected by the operation control unit 2.
2 is the first in which the conduit temperature is set in advance when the heating operation is started.
The operation of the indoor fan 31 is stopped until the temperature reaches the first temperature, and when the temperature reaches the first temperature, the indoor fan 31 is operated at an extremely low speed. After that, the control to shift to the low-speed operation while repeating the switching between the ultra-low-speed operation and the low-speed operation is performed until the indoor-side fan 31 operates at the blowing air volume selected at the start of the heating operation. Then, the operation shifts to the heating operation based on the selected blowing air volume.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a refrigerant compressor, an indoor fan, an indoor heat exchanger, an outdoor fan, an outdoor heat exchanger, and a pressure reducer inserted between the indoor heat exchanger and the outdoor heat exchanger. And an air conditioner having a refrigeration cycle formed by a refrigerant compressor and a four-way valve for switching the connection between the indoor heat exchanger or the outdoor heat exchanger, and more specifically, at the start of the heating operation. The present invention also relates to an indoor air flow control device for an air conditioner, which always blows warm air at an appropriate temperature into a room.

[0002]

[Prior art]

 Conventional air conditioners switch the four-way valve so that during cooling operation, the refrigerant compressed by the compressor passes through the four-way valve, outdoor heat exchanger, decompressor, indoor heat exchanger, and four-way valve. In the heating operation, the refrigerant compressed by the compressor is again circulated to the compressor via the four-way valve, the indoor heat exchanger, the pressure reducer, the outdoor heat exchanger, and the four-way valve. I have.

By the way, in such a conventional air conditioner, at the time of starting a heating operation, an operation control called a so-called hot start is performed in order to prevent cold air from blowing into a room. In this hot start, when the heating operation is started, the operation of the indoor fan is stopped until the conduit temperature reaches the first preset temperature, and when the first temperature is reached, the indoor fan is operated at an extremely low speed. When the conduit temperature reaches the second preset temperature in the state of the ultra-low speed operation, the operation shifts to the heating operation based on the blowing air volume selected at the start of the heating operation.

[0004] The operation of the indoor side fan includes a very low speed (LL) that cannot be set (selected) by the user, a low speed (L), a medium speed (M), and a high speed (H) that can be set (selected) by the user. ) Can be switched to four stages, and the user can arbitrarily select the air volume from three types of low (L), medium (M) and high (H) when setting manually. It is as follows.

[0005] In this case, for example, when the blowing air volume selected at the start of the heating operation is a High air volume for rotating the indoor fan at a high speed (H), the indoor fan turns to an extremely low speed at the end of the hot start. Since the pipes suddenly started rotating at high speed, the temperature of the conduit dropped sharply, and the outlet temperature dropped sharply by about 10 ° C, causing a problem that cold air was blown into the room. Therefore, in the conventional air conditioner, various measures have been taken to prevent cold air from blowing into the room at the start of the heating operation in order to prevent such a problem.

For example, in the air conditioner described in Japanese Patent Application Laid-Open No. Sho 60-147051, as shown in FIG. 6, when a heating operation is started, an indoor side fan is first operated at a very low speed (LL) to blow out air. When the temperature reaches the constant temperature T0, it is switched from the extremely low speed (LL) to the low speed (L). When the blowout temperature lowered by about 3 ° C. becomes the constant temperature T0 again, this time, the low speed (L) changes to the medium speed (L). M), and when the blowing temperature decreased by about 3 ° C. again becomes a constant temperature T0, the mode is switched from medium speed (M) to high speed (H), and the blowing decreased by about 3 ° C. again by this switching. When the temperature reaches the constant temperature T0 again, thereafter, the heating operation is started by the air flow rate selected at the start of the heating operation (in this example, high speed (H) is selected). You have me. With such control, a sharp decrease in the blow-out temperature is prevented.

[0007]

[Problems to be solved by the invention]

 However, also in the air conditioner described in the above-mentioned conventional Japanese Patent Application Laid-Open No. 60-147051, the rotation of the indoor fan is from low speed (LL) to low speed (L), and low speed (L) to medium speed (M). Each time the speed changes from the medium speed (M) to the high speed (H), the outlet temperature changes by about 3 ° C., so that there is a problem that those who are sensitive to the outlet temperature are also concerned about this temperature difference. The present invention has been devised to solve such a problem. The purpose of the present invention is to make the operation of the indoor side fan extremely low (LL), low speed (L), medium speed (M), and high speed (H). In consideration of the four stages, by controlling the switching of these four stages more precisely, the blowing temperature at the start of the heating operation is maintained at a more stable and constant temperature, and the comfort is further improved. To provide an indoor airflow control device for an air conditioner.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, an indoor air blowing control device for an air conditioner according to claim 1 of the present invention includes a refrigerant compressor, an indoor fan, an indoor heat exchanger, an outdoor fan, and an outdoor heat exchanger. A decompressor interposed between the indoor heat exchanger and the outdoor heat exchanger, and a four-way valve for switching the connection between the refrigerant compressor and the indoor heat exchanger or the outdoor heat exchanger. In an air conditioner having a refrigeration cycle formed, a conduit temperature detecting means for detecting a conduit temperature of the indoor heat exchanger, and a conduit temperature detected by the conduit temperature detecting means when a heating operation is started. Operation control means for controlling the operation of the indoor fan based on the operation of the indoor fan. The operation of the indoor fan can be switched to four stages of ultra-low speed, low speed, medium speed, and high speed. Low air flow, medium When the operation control means is provided so as to be arbitrarily selectable from the three types of high speed, at the time of starting the heating operation, the operation of the indoor side fan is continued until the conduit temperature reaches the first temperature set in advance. The operation is stopped, and when the first temperature is reached, the indoor fan is operated at an extremely low speed. When the conduit temperature reaches a second predetermined temperature in the state of the ultra-low speed operation, thereafter, Control to shift to low-speed operation while repeatedly switching between low-speed operation and low-speed operation is performed until the indoor fan operates at the airflow rate selected at the start of heating operation. It is characterized by shifting to a heating operation based on the air volume.

According to the present invention having such characteristics, at the time of starting the heating operation, the operation of the indoor side fan is stopped until the conduit temperature reaches the preset first temperature, and the operation of the indoor fan is stopped at the first temperature. When this temperature is reached, the indoor fan is operated at an extremely low speed. When the pipe temperature reaches the second preset temperature in this ultra-low speed operation, the switching between the ultra-low speed operation and the low speed operation is repeated thereafter. The control to shift to the low-speed operation is performed until the indoor fan is operated with the airflow rate selected at the start of the heating operation. That is, in the conventional technology, when the operation is switched from the ultra-low speed operation to the low speed operation, the low speed operation is continued to some extent, and then the operation is switched to the medium speed operation. Even when switching to low-speed operation, control is performed so that switching between ultra-low-speed operation and low-speed operation, such as switching back to ultra-low-speed operation and switching to low-speed operation, is performed repeatedly at short time intervals. As a result, even when the operation is finally switched completely from the ultra-low speed operation to the low speed operation, the blow-out temperature hardly decreases (3 ° C. does not decrease as in the conventional technology), and the temperature remains almost constant. And maintain a stable state. This is also the case when switching from low-speed operation to medium-speed operation and when switching from medium-speed operation to high-speed operation.

According to a second aspect of the present invention, there is provided the indoor airflow control device for an air conditioner according to the first aspect, wherein the operation control means shifts from an extremely low speed operation to a low speed operation, and a low speed operation. When the transition from the intermediate operation to the intermediate operation and the transition from the intermediate operation to the high speed operation are respectively the transition from the previous operation to the rear operation, the operation control means switches the operation between the previous operation and the rear operation for a certain period of time. It is characterized by the transition from the pre-operation to the post-operation while repeating at. According to the present invention having such a feature, the amount of heat stored in the conduit increases while switching between the pre-operation and the post-operation is repeated for a fixed time. By completely switching from the pre-operation to the post-operation, the blow-out temperature is hardly reduced, and a stable state with almost constant temperature can be maintained.

According to a third aspect of the present invention, there is provided the indoor airflow control device for an air conditioner according to the first aspect, wherein the operation control means shifts from an extremely low speed operation to a low speed operation, and a low speed operation. When the transition from the intermediate operation to the intermediate operation and the transition from the intermediate operation to the high speed operation are respectively the transition from the previous operation to the rear operation, the operation control means switches the operation between the previous operation and the rear operation. It is characterized by gradually changing from pre-operation to post-operation by repeatedly changing the time ratio. According to the present invention having such characteristics, the amount of heat stored in the conduit increases while the switching between the pre-operation and the post-operation is repeated while changing the operation time ratio. By completely switching from the pre-operation to the post-operation at the stage when the temperature increases, the blow-out temperature hardly decreases, and a stable state in which the temperature is kept almost constant can be maintained.

According to a fourth aspect of the present invention, there is provided the indoor airflow control device for an air conditioner according to the second or third aspect, wherein the operation control means includes: After the operation after the transition is continued for a while, the transition control of the post-operation is started from the next pre-operation. According to the present invention having such characteristics, for example, at the stage when the operation is completely shifted from the ultra-low speed operation to the low speed operation, the operation is continued at the low speed operation for a while. In other words, the transition control from the next low-speed operation to the medium-speed operation is performed after waiting for the blow-off temperature in the low-speed operation to stabilize, so that the blow-out temperature can be maintained at a more stable constant temperature.

[0013]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram (refrigeration cycle) of an air conditioner equipped with the indoor air flow control device of the present invention. In FIG. 1, a discharge port 11 and a suction port 12 of a refrigerant compressor (hereinafter simply referred to as a compressor) 1 are connected to one connection port of an indoor heat exchanger 3 having an indoor fan 31 via a four-way valve 2. , Is connected to one connection port of the outdoor heat exchanger 5 having the outdoor fan 51, and the other connection port of the indoor heat exchanger 3 and the other connection port of the outdoor heat exchanger 5 are connected to the decompression device. 4 are connected. The indoor heat exchanger 3 is provided with a conduit temperature sensor 7 for detecting the temperature (substantially the conduit temperature) of the refrigerant flowing in a conduit (not shown) provided inside. An indoor temperature sensor 21 (see FIG. 2) for detecting the temperature of the intake air (that is, the indoor temperature) is arranged near the air inlet of the indoor unit (not shown).

During the heating operation, by switching the four-way valve 2, the discharge port 11 of the compressor 1 and one connection port of the indoor heat exchanger 3 are connected, and the suction port 12 of the compressor 1 and the outdoor heat exchanger 3 are connected. Since one connection port of the exchanger 5 is connected, the high-temperature refrigerant compressed by the compressor 1 flows as indicated by the solid line arrow in the figure to heat the room. That is, the high-temperature refrigerant compressed by the compressor 1 is supplied to the indoor heat exchanger 3 through the four-way valve 2, where the indoor fan 31 forcibly exchanges heat to heat the indoor. The refrigerant condensed after the heat exchange by the indoor heat exchanger 3 is decompressed by the decompressor 4 and supplied to the outdoor heat exchanger 5, where the outdoor fan 51 forcibly exchanges heat to perform cooling. The surface temperature of the outer heat exchanger 5 is reduced. The refrigerant vaporized after the end of heat exchange by the outdoor heat exchanger 5 is circulated to the compressor 1 again through the four-way valve 2.

On the other hand, during the cooling operation, the four-way valve 2 is switched to connect the discharge port 11 of the compressor 1 to one connection port of the outdoor heat exchanger 5, and to connect the suction port 12 of the compressor 1 to the indoor heat exchanger. Since one connection port of the exchanger 3 is connected, the high-temperature refrigerant compressed by the compressor 1 flows as indicated by a broken line arrow in the figure to cool the room.

FIG. 2 is a block diagram showing an electrical configuration of the indoor airflow control device of the present invention. The output of the conduit temperature sensor 7 for detecting the conduit temperature of the indoor heat exchanger 3 and the output of the indoor temperature sensor 21 for detecting the temperature of the intake air at the air inlet of the indoor unit (ie, the indoor temperature) are shown in FIG. The operation control unit 22 controls the refrigeration cycle shown in FIG. The operation control unit 22 is provided with various switches (not shown) for inputting the indoor set temperature and the like during the heating operation and the cooling operation while the timer unit 23 is bidirectionally connected. The input unit 24 is connected. The timer unit 23 measures an arbitrary time set by the operation control unit 22 (for example, a forced operation time of 40 minutes from the start of operation, a fixed time in each embodiment described later, and the like).

The operation control unit 22 includes software that operates on a microcomputer, and includes various operation modes (heating operation mode, cooling operation mode, defrost operation mode) stored in an internal memory (not shown). 2) is a block for controlling the refrigeration cycle shown in FIG. Further, at the start of the heating operation, the operation control unit 22 stops the operation of the indoor-side fan 31 until the conduit temperature reaches a preset first temperature (for example, 32 ° C.), and the first temperature ( 32 ° C), the indoor fan is operated at an extremely low speed (LL), and when the pipe temperature reaches a preset second temperature (38 ° C) in this ultra-low speed operation, the indoor fan is thereafter operated at an extremely low speed (LL). The control that shifts to the low-speed (L) operation while repeating the switching between the low-speed (LL) operation and the low-speed (L) operation is performed by the airflow rate selected at the time when the indoor fan 31 starts the heating operation (for example, the high airflow rate). ), And then shift to heating operation with the selected airflow.

Here, the operation of the indoor side fan 31 includes an ultra-low speed (LL) that cannot be set (selected) by the user, a low speed (L), and a medium speed (M) that can be set (selected) by the user. ) And high speed (H). At the time of manual setting, the user can arbitrarily select an air volume from three types of low speed (L), medium speed (M), and high speed (H). Next, the operation of the air conditioner equipped with the indoor ventilation control device having the above configuration at the time of starting the heating operation will be described with reference to the timing charts shown in FIGS. 3 is a timing chart showing the operation of the first embodiment, FIG. 4 is a timing chart showing the operation of the second embodiment, and FIG. 5 is a timing chart showing the operation of the third embodiment. Hereinafter, respective embodiments will be described.

[Embodiment 1] The feature of the operation of Embodiment 1 is that, for example, switching between an extremely low speed (LL) operation and a low speed (L) operation is repeated for a predetermined time (for example, 10 seconds or the like). The point is that the operation shifts from the low speed (LL) operation to the low speed (L) operation. Hereinafter, the operation of the first embodiment will be described with reference to the timing chart shown in FIG. In addition, FIG. 3 also shows a graph indicating a change in the outlet temperature in the upper stage.

However, in the first embodiment, at the start of the heating operation, the user manually sets the blowing air volume to the high air volume (that is, the heating operation in which the indoor fan 31 is controlled in the high-speed (H) operation). It is assumed that In the heating operation, the user inputs the indoor set temperature, and the operation control unit 22 performs the heating operation so that the indoor temperature detected by the indoor temperature sensor 21 becomes the input indoor set temperature. However, in the present invention, the control before performing the normal heating operation, that is, the control at the time of the so-called hot start, is characterized by the following. The operation control will be described.

That is, when the start switch of the heating operation (not shown) is operated at a time t 1 in a state where the blown air amount is set to the High air amount, the operation signal is input from the input unit 24 to the operation control unit 22. The operation control unit 22 controls the refrigeration cycle (turns on the compressor 1) based on the operation signal, and starts a heating operation (here, a heating operation at a hot start). When the heating operation is started, the conduit temperature sensor 7 detects the conduit temperature Tp of the indoor heat exchanger 3 as needed, and inputs the detected temperature to the operation control unit 22. In the first embodiment, it is assumed that the conduit temperature Tp at the time t1 is, for example, 22 ° C.

When the heating control operation is started at time t 1, the operation control unit 22 changes the conduit temperature detected by the conduit temperature sensor 7 to a first temperature (for example, 32 ° C.) set in advance. ), The operation of the indoor side fan 31 is stopped. Then, at time t2, when the conduit temperature reaches the first temperature (32 ° C.), the indoor-side fan 31 is operated at a very low speed (LL). Then, at time t3, when the conduit temperature reaches a second temperature (for example, 38 ° C.) set inside in advance, thereafter, the ultra-low speed (LL) operation and the low speed (L) operation are performed for a predetermined time ( At time t4, the operation completely shifts to low-speed (L) operation while switching and repeating at intervals of, for example, 10 seconds). In the first embodiment, the repetition of the very low speed (LL) operation and the low speed (L) operation is defined as three cycles.

When the operation completely shifts to the low-speed (L) operation at time t4, the operation control unit 22 continues the low-speed (L) operation for a certain period of time (here, the same 10 seconds), and thereafter, At time t5, the low-speed (L) operation and the medium-speed (M) operation are switched at regular intervals (similarly, 10 seconds) and repeated, and at time t6, the operation completely shifts to the medium-speed (M) operation. . In the first embodiment, the repetition of the low speed (L) operation and the medium speed (M) operation is defined as three cycles.

Then, at the time t6, when the operation mode completely shifts to the medium speed (M) operation, the operation control unit 22 continues the medium speed (M) operation for a certain period of time (here, the same 10 seconds). Then, at the next time t7, this time, the medium speed (M) operation and the high speed (H) operation are switched and repeated at regular time intervals (similarly, 10 seconds), and at the time t8, the high speed (H) operation is completely performed. Transition. In the first embodiment, the repetition of the medium speed (M) operation and the high speed (H) operation is defined as three cycles. After that, in the first embodiment, since the blowing air amount manually set by the user at the time of starting the heating operation is the High air amount, the normal heating operation is shifted from this time t8.

As described above, according to the operation control of the first embodiment, for example, when the operation shifts from the extremely low speed (LL) operation to the low speed (L) operation, the ultra low speed (LL) operation and the low speed (L) operation are performed. While the switching of the temperature is repeated for a fixed time (10 seconds), the amount of heat stored in the conduit increases, and when the amount of stored heat increases, the operation is completely changed from the ultra-low speed (LL) operation to the low speed (L) operation. Since the switching is performed, as shown in the upper part of FIG. 3, the blowing temperature hardly decreases, and a stable state in which the temperature T0 is maintained substantially constant can be maintained. This is the same when shifting from low-speed (L) operation to medium-speed (M) operation and from medium-speed (M) operation to high-speed (H) operation.

In the first embodiment, the operation time of the low-speed (L) operation from time t4 when the operation has completely shifted from the ultra-low-speed (LL) operation to the low-speed (L) operation, and the low-speed (L) operation to the medium-speed operation The operation time of the medium speed (M) operation from the time t6 when the operation completely shifts to the (M) operation is described as 10 seconds, which is the same as the fixed time in each cycle. By setting it slightly longer than the fixed time (10 seconds) (for example, 20 seconds, etc.), it is possible to completely recover from the slight drop in the blowout temperature at the time of the complete transition, and then proceed to the next cycle. Therefore, the blowing temperature can be maintained at a more stable constant temperature. This operation control corresponds to claim 4.

[Second Embodiment] The feature of the operation of the second embodiment is that, for example, switching between an extremely low speed (LL) operation and a low speed (L) operation is repeated while changing the operation time ratio, and an ultra low speed (LL) operation is performed. ) The point is that the operation shifts from low-speed (L) operation. Hereinafter, the operation of the second embodiment will be described with reference to the timing chart shown in FIG. In addition, FIG. 4 also shows a graph indicating a change in the blowing temperature in the upper part.

However, in the second embodiment, at the start of the heating operation, the user manually sets the blowing air volume to the high air volume (that is, the heating operation in which the indoor fan 31 is controlled in the high-speed (H) operation). It is assumed that In the heating operation, the user inputs the indoor set temperature, and the operation control unit 22 performs the heating operation so that the indoor temperature detected by the indoor temperature sensor 21 becomes the input indoor set temperature. However, in the present invention, the control before performing the normal heating operation, that is, the control at the time of the so-called hot start, is characterized by the following. The operation control will be described.

That is, when the start switch of the heating operation (not shown) is operated at the time t 11 in a state where the air flow is set to the High air flow, the operation signal is input from the input unit 24 to the operation control unit 22. The operation control unit 22 controls the refrigeration cycle (turns on the compressor 1) based on the operation signal, and starts a heating operation (here, a heating operation at a hot start). When the heating operation is started, the conduit temperature sensor 7 detects the conduit temperature Tp of the indoor heat exchanger 3 as needed, and inputs the detected temperature to the operation control unit 22. In the second embodiment, it is assumed that the conduit temperature Tp at the time t11 is, for example, 22 ° C.

When the heating control operation is started at time t 11, the operation control unit 22 sets the conduit temperature detected by the conduit temperature sensor 7 to a first temperature (for example, 32 ° C.) set in advance. ), The operation of the indoor side fan 31 is stopped. Then, at time t12, when the pipe temperature reaches the first temperature (32 ° C.), the indoor fan 31 is operated at a very low speed (LL). Then, at time t13, when the conduit temperature reaches a second temperature (for example, 38 ° C.) which is set inside in advance, switching between the ultra low speed (LL) operation and the low speed (L) operation is performed thereafter. The operation is repeated while changing the operation time ratio, and at time t14, the operation completely shifts to the low-speed (L) operation. In the second embodiment, the ratio of the operation time until switching from the very low speed (LL) operation to the low speed (L) operation is changed in three cycles.

That is, in the first cycle (indicated by reference numeral 81 in FIG. 4), the ratio between the operation time of the very low speed (LL) and the operation time of the low speed (L) is 2: 1, and the next 2 In the cycle (indicated by reference numeral 82 in FIG. 4), the ratio between the operation time of the very low speed (LL) and the operation time of the low speed (L) is set to 1: 1. 83), the ratio of the operation time of the very low speed (LL) to the operation time of the low speed (L) is 1: 2. In this way, by increasing the operation time of the low speed (L) with respect to the operation time of the very low speed (LL) every time the cycle is repeated, the operation from the ultra low speed (LL) operation can be performed without lowering the blowing temperature. A smooth transition to low-speed (L) operation has been achieved.

When the operation completely shifts to the low-speed (L) operation at time t 14, the operation control unit 22 continues the low-speed (L) operation for a certain period of time (here, 10 seconds). At time t15, the switching between the low speed (L) operation and the medium speed (M) operation is repeated while changing the ratio of the operation time, and at time t16, the operation completely shifts to the medium speed (M) operation. In the second embodiment, the ratio of the operation time until switching from the low speed (L) operation to the medium speed (M) operation is changed in three cycles.

That is, in the first cycle (indicated by reference numeral 84 in FIG. 4), the ratio of the operation time of the low speed (L) to the operation time of the medium speed (M) is 2: 1, and the next 2 In the cycle (indicated by reference numeral 85 in FIG. 4), the ratio of the low-speed (L) operation time to the medium-speed (M) operation time is set to 1: 1. The ratio of the operation time at low speed (L) to the operation time at medium speed (M) is 1: 2. In this manner, every time the cycle is repeated, the operation time of the medium speed (M) with respect to the operation time of the low speed (L) is increased, so that the low speed (L) operation can be changed to the medium speed without lowering the blowing temperature. (M) A smooth transition to operation is realized.

Then, at time t16, when the operation mode completely shifts to the medium-speed (M) operation, the operation control unit 22 continues the medium-speed (M) operation for a certain period of time (here, 10 seconds). At the next time t17, this time, switching between the medium speed (M) operation and the high speed (H) operation is repeated while changing the operation time ratio, and at time t18, the operation completely shifts to the high speed (H) operation. In the second embodiment, the ratio of the operation time until switching from the medium speed (M) operation to the high speed (H) operation is changed in three cycles.

That is, in the first cycle (indicated by reference numeral 87 in FIG. 4), the ratio of the operation time at the medium speed (M 2) to the operation time at the high speed (H) is 2: 1, and the next 2 In the cycle (indicated by reference numeral 88 in FIG. 4), the ratio of the medium speed (M) operation time to the high speed (H) operation time is set to 1: 1. The reference numeral 89 indicates that the ratio of the medium speed (M) operation time to the high speed (H) operation time is 1: 2. In this way, every time the cycle is repeated, the high-speed (H) operation time with respect to the medium-speed (M) operation time is increased, so that the high-speed (M) operation can be performed without lowering the blowing temperature. (H) A smooth transition to operation is realized. Thereafter, in the second embodiment, since the air flow rate manually set by the user at the start of the heating operation is the High air flow rate, the operation shifts to the normal heating operation from this time t18.

As described above, according to the operation control of the second embodiment, for example, when shifting from the ultra-low speed (LL) operation to the low-speed (L) operation, the ultra-low speed (LL) operation and the low-speed (L) operation are performed. While the change of the operation time is repeated while changing the operation time ratio, the amount of heat stored in the conduit increases, and when the amount of heat stored increases, the operation is switched from the very low speed (LL) operation to the low speed (L) operation. Since the switching is completely performed, as shown in the upper part of FIG. 4, the blowing temperature is hardly reduced, and a stable state in which the temperature T0 is kept almost constant can be maintained. This is the same when shifting from low-speed (L) operation to medium-speed (M) operation and from medium-speed (M) operation to high-speed (H) operation.

In the second embodiment, the ratio of the operation time of the post-operation to the operation time of the pre-operation is 2: 1 for the first cycle, 1: 1 for the second cycle, and 1: 2 for the third cycle. In the third embodiment, a case where the ratio of the operation time is controlled at a different ratio will be described. In the second embodiment, the operation time of the low-speed (L) operation from time t14 when the operation is completely shifted from the ultra-low-speed (LL) operation to the low-speed (L) operation, and the low-speed (L) operation to the medium-speed (M) The operation time of the medium-speed (M) operation from time t16 when the operation is completely shifted to the operation is described as 10 seconds. However, by setting these operation times slightly longer (for example, 20 seconds), Since it is possible to completely recover from a slight drop in the blow-out temperature at the time of complete transfer and then proceed to the next cycle, the blow-out temperature can be maintained at a more stable and constant temperature. This operation control corresponds to claim 4.

[Third Embodiment] The feature of the operation of the third embodiment is that, as a method of changing the ratio of the operation time of the post-operation to the operation time of the pre-operation, the operation time of the pre-operation is always fixed, and The point is that the operation time is changed so as to become longer sequentially (to be twice or three times) with respect to this fixed time. Hereinafter, the operation of the second embodiment will be described with reference to the timing chart shown in FIG. In addition, FIG. 5 also shows a graph indicating a change in the blowing temperature at the upper stage.

However, in the third embodiment, at the time of starting the heating operation, the user manually sets the blowing air volume to the High air volume (that is, the heating operation in which the indoor fan 31 is controlled in the high-speed (H) operation). It is assumed that In the heating operation, the user inputs the indoor set temperature, and the operation control unit 22 performs the heating operation so that the indoor temperature detected by the indoor temperature sensor 21 becomes the input indoor set temperature. However, in the present invention, the control before performing the normal heating operation, that is, the control at the time of the so-called hot start, is characterized by the following. The operation control will be described.

That is, when the start switch of the heating operation (not shown) is operated at the time t 21 in a state where the air flow is set to the High air flow, the operation signal is input from the input unit 24 to the operation control unit 22. The operation control unit 22 controls the refrigeration cycle (turns on the compressor 1) based on the operation signal, and starts a heating operation (here, a heating operation at a hot start). When the heating operation is started, the conduit temperature sensor 7 detects the conduit temperature Tp of the indoor heat exchanger 3 as needed, and inputs the detected temperature to the operation control unit 22. In the second embodiment, it is assumed that the conduit temperature Tp at the time t21 is, for example, 22 ° C.

When the heating control operation is started at time t21, the operation control unit 22 sets the conduit temperature detected by the conduit temperature sensor 7 to a first temperature (for example, 32 ° C.) set in advance. ), The operation of the indoor side fan 31 is stopped. Then, at time t22, when the pipe temperature reaches the first temperature (32 ° C.), the indoor-side fan 31 is operated at a very low speed (LL). Then, at a time t23, when the conduit temperature reaches a second temperature (for example, 38 ° C.) preset inside, switching between the ultra-low speed (LL) operation and the low speed (L) operation is performed thereafter. The operation is repeated while changing the operation time ratio, and at time t24, the operation completely shifts to the low speed (L) operation. In the third embodiment, the ratio of the operation time until switching from the extremely low speed (LL) operation to the low speed (L) operation is changed in three cycles.

That is, in the first cycle (indicated by reference numeral 91 in FIG. 5), the ratio of the operation time of the very low speed (LL) to the operation time of the low speed (L) is set to 1: 1 and the following 2 In the cycle (indicated by reference numeral 92 in FIG. 5), the ratio of the operation time of the very low speed (LL) to the operation time of the low speed (L) is 1: 2, and the next third cycle (reference numeral in FIG. 5). 93, the ratio of the operation time of the very low speed (LL) to the operation time of the low speed (L) is 1: 3. In this way, by increasing the operation time of the low speed (L) with respect to the operation time of the very low speed (LL) every time the cycle is repeated, the operation from the ultra low speed (LL) operation can be performed without lowering the blowing temperature. A smooth transition to low-speed (L) operation has been achieved.

At time t 24, when the operation completely shifts to the low-speed (L) operation, the operation control unit 22 continues the low-speed (L) operation for a certain period of time (here, 10 seconds), and then performs the next operation. At time t25, the switching between the low speed (L) operation and the medium speed (M) operation is repeated while changing the ratio of the operation time, and at time t26, the operation completely shifts to the medium speed (M) operation. In the third embodiment, the ratio of the operation time until switching from the low speed (L) operation to the medium speed (M) operation is changed in three cycles.

That is, in the first cycle (indicated by reference numeral 94 in FIG. 5), the ratio of the operation time at low speed (L) to the operation time at medium speed (M) is 1: 1 and the following 2 In the cycle (indicated by reference numeral 95 in FIG. 5), the ratio of the low-speed (L) operation time to the medium-speed (M) operation time is 1: 2, and the next third cycle (in FIG. The ratio of the low-speed (L) operation time to the medium-speed (M) operation time is 1: 3. In this manner, every time the cycle is repeated, the operation time of the medium speed (M) with respect to the operation time of the low speed (L) is increased, so that the low speed (L) operation can be changed to the medium speed without lowering the blowing temperature. (M) A smooth transition to operation is realized.

Then, at time t 26, when the operation mode completely shifts to the medium speed (M) operation, the operation control unit 22 continues this medium speed (M) operation for a certain period of time (here, 10 seconds). At the next time t27, this time, switching between the medium speed (M) operation and the high speed (H) operation is repeated while changing the ratio of the operation time, and at time t28, the operation completely shifts to the high speed (H) operation. In the third embodiment, the ratio of the operation time until switching from the medium speed (M) operation to the high speed (H) operation is changed in three cycles.

That is, in the first cycle (indicated by reference numeral 97 in FIG. 5), the ratio of the operation time at the medium speed (M 2) to the operation time at the high speed (H) is 1: 1 and the following 2 In the cycle (indicated by reference numeral 98 in FIG. 5), the ratio of the operation time of the medium speed (M) to the operation time of the high speed (H) is 1: 2, and the next third cycle (in FIG. No. 99) has a ratio of the medium speed (M) operation time to the high speed (H) operation time of 1: 3. In this way, every time the cycle is repeated, the high-speed (H) operation time with respect to the medium-speed (M) operation time is increased, so that the high-speed (M) operation can be performed without lowering the blowing temperature. (H) A smooth transition to operation is realized. Thereafter, in the third embodiment, since the air flow rate manually set by the user at the start of the heating operation is the High air flow rate, the process shifts to the normal heating operation from time t28.

As described above, according to the operation control of the third embodiment, for example, when the operation shifts from the extremely low speed (LL) operation to the low speed (L) operation, the ultra low speed (LL) operation and the low speed (L) operation are performed. While the change of the operation time is repeated while changing the operation time ratio, the amount of heat stored in the conduit increases, and when the amount of heat stored increases, the operation is switched from the very low speed (LL) operation to the low speed (L) operation. Since the switching is completely performed, as shown in the upper part of FIG. 5, the blowing temperature hardly decreases, and a stable state in which the temperature T0 is maintained at a substantially constant temperature can be maintained. This is the same when shifting from low-speed (L) operation to medium-speed (M) operation and from medium-speed (M) operation to high-speed (H) operation.

In the third embodiment, the operation time of the low-speed (L) operation from time t24 when the operation has completely shifted from the ultra-low-speed (LL) operation to the low-speed (L) operation, and the low-speed (L) operation to the medium-speed operation (M) The operation time of the medium speed (M) operation from time t26 when the operation completely shifts to the operation is described as 10 seconds, but these operation times may be set slightly longer (for example, 20 seconds). Thus, since it is possible to completely recover from the slight drop in the blow-out temperature at the time of the complete transition and then proceed to the next cycle, the blow-out temperature can be maintained at a more stable constant temperature. This operation control corresponds to claim 4.

The above-described second and third embodiments are merely examples in which the ratio of the operation time is changed, and the present invention is not limited to such a ratio. In short, when shifting from the pre-operation to the post-operation, if the ratio is changed so that the operation time of the pre-operation is gradually reduced and, conversely, the operation time of the post-operation is gradually increased, It goes without saying that any ratio change is acceptable. The time for performing the hot start control from the start of the heating operation to the transition to the normal heating operation is about 2 minutes to 10 minutes, and at most 15 minutes. If it is longer than this, the user will complain that the control will not be as expected if the High air flow is not reached forever after starting the heating operation, even though the user has manually selected, for example, the High air flow. This is because there is a possibility that you will feel a mistake or mistake it for a malfunction.

[0050]

[Effect of the invention]

 According to the indoor air flow control device for an air conditioner according to claim 1 of the present invention, at the time of starting the heating operation, the operation of the indoor fan is stopped until the conduit temperature reaches the preset first temperature. When the first temperature is reached, the indoor fan is operated at an extremely low speed. When the pipe temperature reaches the second preset temperature in this ultra-low speed operation, the ultra-low speed operation and the low speed operation are thereafter performed. The control to shift to low-speed operation while repeating the switching is performed until the indoor fan is operated with the selected air volume at the start of heating operation. That is, for example, regarding switching between ultra-low speed operation and low speed operation, control is performed so that switching between ultra low speed operation and low speed operation is performed repeatedly at short time intervals. As a result, even when the operation is finally completely switched from the ultra-low speed operation to the low speed operation, the blowout temperature hardly decreases, and a stable state in which the temperature is kept almost constant can be maintained. According to the air conditioner indoor blower control device according to the second aspect of the present invention, the operation is switched from the pre-operation to the post-operation while switching between the pre-operation and the post-operation is repeated for a fixed time. . In other words, while the switching between the pre-operation and the post-operation is repeated for a certain period of time, the amount of heat stored in the conduit increases, and at the stage where the amount of heat storage has increased, the operation from the pre-operation to the post-operation is completely completed. By switching, the blowout temperature hardly decreases, and a stable state in which the temperature is kept almost constant can be maintained. Further, according to the indoor air flow control device for an air conditioner according to claim 3 of the present invention, the switching between the pre-operation and the post-operation is repeated while changing the ratio of the operation time, and the operation is gradually changed from the pre-operation to the post-operation. It is configured to shift to. In other words, the amount of heat stored in the conduit increases while switching between the pre-operation and the post-operation while changing the ratio of operation time. By completely switching to operation, the blow-out temperature is hardly reduced, and a stable state with almost constant temperature can be maintained. Further, according to the air conditioner indoor blower control device according to claim 4 of the present invention, when the operation is shifted from the previous operation to the rear operation, the operation after the transition is continued for a while, and then the operation is performed after the next previous operation. It is configured to start operation transition control. For example, at the stage when the operation is completely shifted from the ultra-low speed operation to the low speed operation, the operation is continued for a while at the low speed operation. In other words, the transition control from the next low-speed operation to the medium-speed operation is performed after waiting for the blowing temperature to stabilize in the low-speed operation, so that the blowing temperature can be maintained at a more stable constant temperature.

[Brief description of the drawings]

FIG. 1 is a system diagram of an air conditioner provided with an indoor ventilation control device of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the indoor ventilation control device of the present invention.

FIG. 3 is a timing chart showing the operation of the first embodiment of the present invention.

FIG. 4 is a timing chart showing the operation of the second embodiment of the present invention.

FIG. 5 is a timing chart showing the operation of the third embodiment of the present invention.

FIG. 6 is a timing chart showing an operation of the conventional air conditioner at the time of starting a heating operation.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 compressor (refrigerant compressor) 2 four-way valve 3 indoor heat exchanger 4 decompressor 5 outdoor heat exchanger 7 conduit temperature sensor (conduit temperature detecting means) 21 indoor temperature sensor 22 operation control unit (operation control unit) 23 timer unit 24 Input section

Claims (4)

[Utility model registration claims] 1. A refrigerant compressor, an indoor fan, an indoor heat exchanger, an outdoor fan, an outdoor heat exchanger, and interposed between the indoor heat exchanger and the outdoor heat exchanger. In an air conditioner including a decompressor and a refrigeration cycle formed by a four-way valve that switches a connection between the refrigerant compressor and the indoor heat exchanger or the outdoor heat exchanger, a pipe temperature of the indoor heat exchanger And an operation control means for controlling the operation of the indoor fan based on the conduit temperature detected by the conduit temperature detecting means at the start of the heating operation. When the operation is provided so that it can be switched between ultra-low speed, low speed, medium speed, and high speed, and the air flow can be arbitrarily selected from three types of low, medium, and high speed. The said driving At the start of the heating operation, the control means stops the operation of the indoor side fan until the conduit temperature reaches a preset first temperature, and operates the indoor side fan at a very low speed when the temperature reaches the first temperature. Then, when the conduit temperature reaches a second preset temperature in the state of the ultra-low speed operation, thereafter, control to shift to the low speed operation while repeatedly switching between the ultra low speed operation and the low speed operation, An indoor air blower control device for an air conditioner, characterized in that the indoor fan is operated until the indoor fan starts operating with a selected air flow rate at the start of a heating operation, and thereafter, the operation shifts to a heating operation using the selected air flow rate. 2. A transition from the ultra-low speed operation to the low speed operation, a transition from the low speed operation to the medium speed operation, and a transition from the medium speed operation to the high speed operation by the operation control means, respectively.
The method according to claim 1, wherein when transitioning from the pre-operation to the post-operation, the operation control means transitions from the pre-operation to the post-operation while repeatedly switching the pre-operation and the post-operation for a predetermined time. An indoor airflow control device for an air conditioner according to the above. 3. A transition from the ultra-low speed operation to the low speed operation, a transition from the low speed operation to the medium speed operation, and a transition from the medium speed operation to the high speed operation by the operation control means, respectively.
When the transition from the previous operation to the rear operation, the operation control means, switching between the front operation and the rear operation,
The indoor ventilation control device for an air conditioner according to claim 1, wherein the operation is repeated while changing the ratio of the operation time to gradually shift from the previous operation to the post operation. 4. When the operation control means shifts from the pre-operation to the post-operation, the operation after the transition is continued for a while, and then the post-operation transition control from the next pre-operation is started. The indoor airflow control device for an air conditioner according to claim 2 or 3.