JP2012242037A - Air conditioner outdoor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner that allows a plurality of blowers to be controlled individually without discrimination.SOLUTION: The air conditioner outdoor unit includes a plurality of blowers arranged vertically in a row, an inverter driving a compressor and a motor for the compressor, a temperature detecting means detecting a temperature of the inverter, and a memory means storing a connecting condition of the blowers. An upper blower and a lower blower of the plurality of blowers are operated at different rotational frequencies in a condition during compressor operation. In such a case where a detected temperature by the temperature detecting means is within a predetermined fluctuation range in a predetermined period, the upper blower and the lower blower are operated by reversely setting the rotational frequencies of the upper blower and lower blower of the plurality of blowers, and in such a case where a reverse connection is determined by distinguishing whether the upper blower and lower blower are connected normally or not by an increase or decrease of the detected temperature, the reverse connecting condition is memorized in the memory means, and then the rotational frequencies of the upper blower and the lower blower are set reversely.

Description

  The present invention relates to an outdoor unit of an air conditioner provided with a plurality of blowers arranged one above the other.

  Conventionally, in an outdoor unit of an air conditioner in which a plurality of (for example, two) fans are arranged side by side with respect to one heat exchanger, the rotational speeds of the upper and lower fans are set to different values for the purpose of noise avoidance and the like. There are some (see, for example, Patent Document 1).

  Hereinafter, a conventional outdoor unit of an air conditioner will be described with reference to the drawings.

  In FIG. 3, inside the outdoor unit 1 of an air conditioner, two air outlets 2 and 3 are vertically arranged on the front surface. One side and the back of the outdoor unit 1 are opened, and an L-shaped heat exchanger 4 is disposed inside the side and the back.

  In the outdoor unit 1, blowers 5 and 6 are provided inside the heat exchanger 4 so as to be arranged vertically. The upper blower 5 is provided at a position corresponding to the upper air outlet 2 and forms a blower circuit by blowing outside air from the air outlet 2 via the heat exchanger 4. Similarly, the lower blower 6 is provided at a position corresponding to the lower air outlet 3, and forms a blower circuit that blows outside air from the air outlet 3 via the heat exchanger 4.

  The internal space of the outdoor unit 1 is divided by the partition wall 7 into a space where the heat exchanger 4 and the blowers 5 and 6 are present and a space where the compressor 8 and the circuit board 9 are present. The circuit board 9 is mounted with components of a compressor inverter 24, which will be described later, the control unit 12, and the like. Further, the circuit board 9 is mounted on the partition wall 7, and the heat radiating plate 10 is provided in a state of penetrating the partition wall 7 from the mounting position and in contact with the air blowing circuit. The heat radiating plate 10 is for radiating heat of a switching element that is a component that generates a large amount of heat among the constituent parts of the inverter 24 for the compressor, and is disposed at a position where the air blow from the upper blower 5 is easily received.

  In other words, the upper blower 5 is used not only for the heat exchange of the heat exchanger 4 and the outside air but also for cooling the compressor inverter 24.

  Next, FIG. 4 shows a circuit configuration diagram of the control unit. AC power supplied from a commercial AC power supply 20 is converted into DC power by a converter including a rectifying unit 21, a power factor improving unit 22, and a smoothing unit 23, and a compressor including a switching element (not shown). It is converted to a predetermined frequency by the inverter 24 and supplied as AC power to the compressor motor 25. Similarly, the fan inverters 26a and 26b configured by switching elements (not shown) are converted to a predetermined frequency, and AC power is supplied to the fan motors 27a and 27b.

  On the other hand, the control circuit 28 has means (not shown) for detecting the temperature of the heat exchanger 4, the outside air temperature, the temperature of the compressor 8, and the like, and the rotation to the compressor inverter 24 and the blower inverters 26 a and 26 b. It has a calculation unit 28a for calculating a drive instruction and a signal output unit 28b for outputting each drive signal, and is controlled so as to realize an optimum operation according to an air conditioning load required from an indoor unit (not shown). I do.

Here, since it is necessary for the upper blower 5 and the lower blower 6 to perform heat exchange of the heat exchanger 4 efficiently, it is desirable to blow the air uniformly over the entire surface of the heat exchanger 4. However, when the upper and lower blowers are set to the same number of rotations, it is known that a wind speed distribution is generated in the vicinity of the air outlet, which causes large so-called periodic noise. (For example, refer to Patent Document 2).

  In order to avoid this, the upper blower 5 is higher or lower than the lower blower 6 according to the number of revolutions calculated by the computing unit 28a so that the blowers 5 and 6 do not have the same number of revolutions. It is controlled to operate, and it is possible to reduce noise caused by the blower.

JP 2002-257382 A JP 2000-356362 A

  However, in the conventional configuration, since the upper blower 5 is used for cooling the compressor inverter 24, the upper and lower blowers 5 and 6 are not only used for reducing noise but also for obtaining an appropriate heat dissipation effect. Therefore, it is necessary to control the upper and lower blowers strictly separately.

  Therefore, even when the fans 5 and 6 have the same specifications for the purpose of sharing, the connection part to the circuit board 9 clearly distinguishes the connection part of the upper fan and the connection part of the lower fan. Had the problem of having to do.

  This invention solves the said conventional subject, and it aims at providing the air conditioner in which each control is possible independently, without distinguishing the multiple fan arranged.

  In order to solve the above-mentioned conventional problems, an outdoor unit of an air conditioner according to the present invention includes a plurality of blowers arranged side by side, an inverter for driving a compressor and a compressor motor, and a temperature of the inverter. Temperature detecting means and storage means for storing the connection state of the blower, and when the compressor is operated, the upper and lower sides of the plurality of blowers are operated at different rotational speeds, and the temperature detected by the temperature detecting means is a predetermined time. In the case of a predetermined fluctuation range, the upper and lower rotational speeds of a plurality of fans are set to operate in reverse, and it is determined whether or not the upper and lower fans are normally connected by increasing and decreasing the temperature detection temperature, When the reverse connection is determined, the reverse connection state is stored in the storage means, and thereafter the normal rotation speed of the upper and lower blowers is reversed so that the upper and lower blowers are connected normally. Contact It is possible to operate at the same rotational speed as if it is, there is no need to perform a strict distinction when connecting a plurality of blower to the circuit board.

  The present invention can provide an air conditioner capable of independent control without distinguishing a plurality of arranged fans.

1 is a circuit configuration diagram of an air conditioner according to Embodiment 1 of the present invention. The flowchart which shows the operation | movement concept in the same Embodiment 1. External perspective view of a conventional air conditioner Circuit diagram of conventional air conditioner

An outdoor unit of an air conditioner according to a first aspect of the present invention includes a plurality of blowers arranged side by side, an inverter that drives a compressor and a compressor motor, temperature detection means that detects the temperature of the inverter, A storage means for storing the connection state, and when the compressor is operated, the top and bottom of the plurality of fans are operated at different rotational speeds, and the temperature detected by the temperature detection means is within a predetermined fluctuation range at a predetermined time. In addition, when the upper and lower rotational speeds of a plurality of blowers are set to operate in reverse, it is determined whether or not the upper and lower fans are normally connected by increasing and decreasing the temperature detection temperature. The reverse connection state is stored in the storage means, and then, when the upper and lower blowers are connected in reverse by reversing the set rotation speeds of the upper and lower blowers, the same number of rotations as when normally connected In motion Since it is possible to, there is no need to perform a strict distinction when connecting a plurality of blower to the circuit board.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows an embodiment of a circuit configuration diagram of a control unit of an air conditioner according to the present invention. FIG. 2 is a time chart showing the operation concept. In FIG. 1, the same components as those in FIG. 4 showing the configuration of the prior art are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, the temperature detection means 30 detects the temperature of the compressor inverter 24 and inputs the detected temperature to the arithmetic unit 28 a provided in the control circuit 28. The control circuit 28 is provided with a storage means 29 and can store the mounting state of the blowers 5 and 6 in either normal or reverse connection.

  FIG. 2 shows the passage of time t on the horizontal axis, where (a) shows the operating state of the compressor 8 ON and OFF, that is, the operating state of the compressor inverter 24, and (b) shows the upper side. The rotational speed setting of the blower 5, (c) shows the change in the setting value of the rotational speed setting of the lower blower 6, and (d) is the temperature change of the compressor inverter 24 detected by the temperature detection means 30. Is shown.

  When the operation is started at time t0, the operating frequency of the compressor inverter 24, the rotational speed setting values of the upper blower 5 and the lower blower 6 are set based on the air conditioning load required from the indoor unit (not shown). Is calculated by the calculation unit 28a, and the operation is started.

  The upper blower 5 and the lower blower 6 are set at different rotational speeds in order to reduce noise, but the upper blower 5 is connected to the compressor inverter 24 via the radiator plate 10 as described in FIG. Since the cooling is also used, for example, as shown in FIG. 2, the rotational speed of the blowers 5 and 6 is determined in consideration of the cooling effect by the heat sink 10 such that the upper side is 500 rpm and the lower side is 300 rpm.

  Although the compressor inverter 24 continues to rise from time t0, as described above, the upper fan 5 and the lower fan 6 continue to operate at the same number of revolutions because they are cooled by the upper fan 5 via the heat sink 10. The temperature is in equilibrium.

  If ΔTc is a temperature change between an arbitrary time t1 and a predetermined time Δt, it can be determined that the temperature of the compressor inverter 24 is stable if ΔTc is within a predetermined value. This time is set to t2, and the rotational speed setting of the upper blower 5 and the lower blower 6 is set in reverse at this time.

  For example, in the case of the control in the present embodiment, as shown in FIG. 2, the upper blower 5 decreases the rotation speed from 500 rpm to 300 rpm, and the lower blower 6 increases the rotation speed from 300 rpm to 500 rpm.

  Here, when the blower 5 is correctly attached to the upper side and the blower 6 is correctly attached to the lower side, the cooling effect is reduced because the number of rotations of the upper blower 5 also used for cooling by the heat sink 10 is reduced. As a result, the temperature of the compressor inverter 24 rises as indicated by the alternate long and short dash line.

  On the other hand, when the blower 5 is mounted on the lower side and the blower 6 is mounted on the reverse side, the blower 6 is mounted on the upper side, so that the cooling effect on the heat radiating plate 10 is increased. The temperature of the compressor inverter 24 decreases as shown by the solid line.

  That is, whether the blowers 5 and 6 are correctly installed by comparing the temperature of the compressor inverter 24 at the time t3 when a certain time has elapsed from t2 with the temperature of the compressor inverter 24 at the time t2. Determine if.

  At time t3, the attachment of the fans 5 and 6 is determined to be normal or reverse connection, and any state is stored in the storage means 29. In the case of reverse connection, the subsequent rotation of the fans 5 and 6 is performed. Set the number setting to the opposite of normal.

  This makes it possible to drive the upper and lower sides at different rotational speeds at a desired rotational speed setting without strictly distinguishing the attachment of the blowers 5 and 6 from the upper side and the lower side. Improvements can be made.

  Moreover, it becomes possible to make the blowers 5 and 6 have exactly the same specifications, and it becomes possible to share parts. Although it is assumed that the blowers 5 and 6 can set a predetermined number of revolutions, even when only the operation / stop is performed, it is possible to obtain the same effect by operating them upside down.

  As described above, the outdoor unit for an air conditioner according to the present invention does not need to be strictly distinguished when assembling, even when it is necessary to drive a plurality of fans at different rotational speeds. It becomes possible to share specifications.

DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Air blowout port 3 Air blowout port 4 Heat exchanger 5 Blower 6 Blower 30 Temperature detection means

Claims (1)

A plurality of blowers provided side by side; an inverter that drives the compressor and the compressor motor; temperature detection means for detecting the temperature of the inverter; and storage means for storing the connection state of the blowers.
When the compressors are operated, the top and bottom of the plurality of fans are operated at different rotational speeds, and the temperature detected by the temperature detecting means has a predetermined fluctuation range at a predetermined time. Set the rotation speed of the
It is determined whether or not the upper and lower fans are normally connected by increasing and decreasing the temperature detection temperature, and when it is determined that the connection is reverse, the reverse connection state is stored in the storage unit, and thereafter An outdoor unit for an air conditioner, wherein the set rotational speed of the blower is reversed.

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