JPS63267857A - Unit type air conditioner - Google Patents

Abstract

PURPOSE:To enable executing of stable cooling without the occurrence of liquid back during cooling operation during a middle season and winter season, by providing a switching thermostat which switches an outdoor blower into a plurality of speed regulations by means of an open air temperature sensor. CONSTITUTION:Cooling and heating are effected by means of an outdoor machine 22, a right indoor machine 25, and a left indoor machine 26, which are situated in a pericounter 21. The open air flows in an air flow passage through an outdoor suction port 18, and is exhausted from an outdoor exhaust port 19 to the outside through an outdoor heat exchanger 28 by means of a suction duct 30. In this case, an open air temperature sensor 33 situated in a suction port 32 perceives a suction air temperature to switch a switching thermostat 45. When an outer air temperature is low, an outdoor blower 29 is run at a low notch to reduce an airflow so that the condensation pressure on the outdoor heat exchanger 28 is brought into a state approximately similar to a proper pressure line W. When the open air temperature is high, the outdoor blower is run at a high notch to bring the condensation pressure into a state approximately similar to the proper pressure line W. This constitution prevents the occurrence of liquid back-flow phenomenon, to the compressor and also provides a stable freezing cycle during the winter season.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for an individual air conditioner installed in a verimator zone of a building.

BACKGROUND OF THE INVENTION Conventionally, this type of individual air conditioner has an outdoor suction port 2 and an outdoor exhaust port 3 formed on the outer wall 1 of a building, and a pericounter 6 on the indoor side 4, as shown in FIG. . An outdoor unit 6 and a right indoor unit 9 and a left indoor unit 10 located on both sides of the outdoor unit 6 and connected by refrigerant pipes 7 and 8 are provided inside the peri-counter 6. The outdoor unit 6 includes a compressor 11, an outdoor heat exchanger 12, and an outdoor blower 13, a suction duct 14 communicating with the outdoor suction port 2, and an exhaust duct 1 communicating with the outdoor exhaust port 3.
5 are connected to the outdoor unit 6, respectively.

By operating the outdoor unit 6, the right indoor unit 9, and the left indoor unit 1o, outdoor air flows into the outdoor suction port 2 and passes through the suction duct 14 to the outdoor unit 6 as shown by arrow A.
, passes through the outdoor heat exchanger 12 , passes through the outdoor blower 13 , and passes through the exhaust duct 16 as shown by arrow B to the outdoor exhaust port 3 .
Exhaust air is discharged to the outside. At the same time, the right indoor unit 9
Refrigerant is sent to the left indoor unit 1o via refrigerant pipes 7 and 8, and the indoor room 4 is cooled by latent heat of evaporation during cooling, and heated by latent heat of condensation during heating.

Problems to be Solved by the Invention With such a conventional configuration, when the heat generation in the room 4 is large, for example, when the building is equipped with many computer-related machines or when the building is used as a kitchen, etc. Depending on conditions specific to the building, such as sunlight conditions, indoor cooling operation may be performed even in the middle of the season or during the heating season. In this case, the outdoor heat exchanger 12 acts as a condenser, but since the temperature of the outside air flowing in from the outdoor suction port 2 is low and the air volume due to the operation of the outdoor blower 13 is constant, the outdoor heat exchanger 12 is operated as a condenser. The condensation pressure in the evaporator (not shown) in the right indoor unit 9 and left indoor unit 1o also decreases due to this decrease in condensation pressure, but compared to the decrease in condensation pressure, the evaporation pressure is As a result, the amount of refrigerant circulated becomes large, and the evaporator does not evaporate sufficiently, resulting in a liquid back phenomenon, resulting in a problem that stable cooling operation cannot be performed during the intermediate season or the heating season (winter).

The present invention solves these problems, and aims to provide an individual air conditioner that performs stable cooling operation without liquid back-up during cooling operation during the intermediate season or winter.

Means for Solving the Problems In order to solve this problem, the present invention provides an outdoor unit with an outdoor heat exchanger, an outdoor blower, and a windward side of the outdoor heat exchanger that receives sunlight, radiant heat, etc. The outdoor air blower is equipped with an outside air temperature sensor that senses the outside air temperature at a position that does not affect the air temperature, and a switching thermostat that switches the outdoor blower to multiple speeds using the outside air temperature sensor.

With this configuration, the outside air temperature sensor senses the temperature of the outside air during cooling operation, and the speed of the outdoor fan is controlled via the switching thermostat based on the detected temperature.When the outside air temperature is low, the outdoor fan is operated at a low speed and When the temperature is high, high-speed operation is performed to keep the outdoor heat exchanger, which acts as a condenser, at a constant condensing pressure.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. As shown in the figure, the outer wall of the building 17. An outdoor suction port 18 and an outdoor exhaust port 19 are formed in the door, and a bell counter 21 is provided on the door and indoor 20 sides. Inside this peri-counter 21 is an outdoor unit 22 and this outdoor unit 2.
A right indoor unit 26 and a left indoor unit 26 are provided, which are located on both sides of 2 and connected by refrigerant pipes 23 and 24. The outdoor unit 22 includes a compressor 27, an outdoor heat exchanger 28, and an outdoor blower 29, and includes a suction duct 30 communicating with the outdoor suction port 18, and an exhaust duct 31 communicating with the outdoor exhaust port 19. are connected to the outdoor unit 22, respectively. The right indoor unit 25 and the left indoor unit 26 are each equipped with an indoor heat exchanger and an indoor blower (both not shown), and an indoor inlet (not shown) provided near the floor of the pericounter 21.
Indoor air is sucked in and blown into the room from the top side (not shown) of the pericounter 21 from each indoor unit 25 and 26. An outside air temperature sensor 33 is provided on the windward side of the outdoor unit 220 and the outdoor heat exchanger 28, that is, at the suction port 32 communicating with the outdoor suction port 18, to detect the outside air temperature, that is, the suction temperature. Multiple speed controls are provided for switching.

This switching control will be explained based on FIG. 2.

The switching control device has terminals 36 to 39 connected to an operation box (not shown) for performing driving operations, and these terminals 36 to 39 constitute a circuit for the outdoor unit 22. That is, from the terminal 36 to the compressor 27, the compressor auxiliary relay 4
0, a circuit is formed through the contact 40a of this compressor auxiliary relay 4o to the terminal 39, and 0LP41 (overload relay) is connected between a and b of the contact 40a to connect the compressor 27.
drive. The terminal 38 is connected to a defrost timer motor 41, and a four-way valve 42 connected to the defrost timer motor 41 and the frost detection contact 40a, and an outdoor blower relay 43 are provided, and the contact 43a of the outdoor blower relay 43 is provided. is provided in the middle of the lead wire 44 of the terminal 36, and is connected between a and b during cooling and between a and c during heating.

A switching thermostat 46 consisting of two stages, which is switched depending on the temperature of the outside air temperature sensor 33, is connected between a and b on the cooling side of the contact 43a, and has a high temperature side contact 46 and a low temperature side contact 47, The strong notch wire 48, the middle notch wire 49, and the weak notch wire 60, which control the speed of the blower 29, are connected to each other, and the strong notch wire 61 is connected between a and c, which is the heating side of the contact 43a. It is connected to 48.

In the above configuration, the outdoor unit 22 provided in the Pericolor rod 21, the right indoor unit 25, and the left indoor unit 26 provide cooling,
Heating is performed, and the air flow path at this time is the outdoor suction port 18.
Outside air flows in from the suction duct 3o, passes through the suction port 32 as shown by arrow A, passes through the outdoor heat exchanger 28, and is exhausted from the outdoor blower 29 to the outside from the outdoor exhaust port 19 as shown by arrow B. At this time, the outside air temperature sensor 33 provided at the suction port 32 senses the suction air temperature and switches the switching thermostat 46. That is, in FIG. 2, since cooling operation will be performed during the intermediate season or heating season, the input is input from the terminal 38 and sent to one end of the outdoor fan relay 43 via the lead wire 52, and the other end is sent to the lead wire 53.
The terminal 39 is energized through the relay 43 for the outdoor blower.
is excited, and its contact 43a becomes the cooling side between a and b. By switching to the cooling side, the switching thermostat 46 is energized via the lead wire 65. Here, the external temperature sensor 33 senses the outside air temperature, and depending on this outside air temperature, the switching thermostat 46 is switched to the high temperature side contact 46 or the low temperature side contact 47. For example, if the outside temperature is D-
24℃ or higher between E and 2jO~9 between D-2 and G-H
℃ and G-I are set to switch at 6°C or lower, if the outside air temperature detected by the outside air temperature sensor 33 is 24°C or higher (higher in the heating season), D- E, the strong notch wire 48 is energized and the outdoor blower 29 is operated at the strong notch. Next, when the outside temperature is within the range of 21℃ to 9℃, between D-F' and G-H.
The middle notch line 49 is energized to operate at the middle notch. Next, when the temperature is 6°C or lower, it becomes between D-2 and G-I, so the weak notch wire 6o is energized and weak notch operation is performed. 29 speed adjustment control is performed. As shown in FIG. 3, by this speed regulation control, when the outside air temperature is low, that is, when it is 6'C or less, the outdoor blower 29 is operated at a low notch to maintain the condensing pressure to the outdoor heat exchanger 28 at an appropriate pressure. line(
Reduce the air volume so that the condition is close to W). Also,
When the outside temperature is between 9°C and 21°C, turn on the outdoor fan 29.
Operate at medium notch and set the air volume so that the condensing pressure is close to the appropriate pressure line (W). The outside temperature is high24
When the temperature is above ℃ (mostly in a state close to cooling), the outdoor blower 29 is operated at a strong notch, and a large amount of air is blown to the outdoor heat exchanger 28 in response to the condensing pressure, which is in the high pressure direction. The condensing pressure is always maintained at an appropriate level during cooling operation in winter by setting the pressure close to the appropriate pressure line (W) depending on the outside temperature.

Effects of the Invention As is clear from the description of the embodiments described above, the present invention includes an outdoor air temperature sensor that detects the outdoor air temperature at the suction port on the windward side of the outdoor unit, and uses the outdoor air temperature sensor to control the outdoor fan at multiple speeds. We installed a switching thermostat to control the outdoor blower in stages according to the outside air temperature during cooling operation during the mid-season and winter months, so the condensation pressure in the outdoor heat exchanger, which acts as a condenser, is reduced. The refrigeration cycle is maintained stably depending on the outside temperature, and there is no phenomenon of a significant drop when the outside temperature is low, unlike in conventional systems, and there is no liquid backflow to the compressor, resulting in a stable refrigeration cycle even in winter. This has the effect that

[Brief explanation of drawings]

Fig. 1 is a plan configuration diagram of an individual air conditioner according to an embodiment of the present invention, Fig. 2 is a control circuit diagram of the individual air conditioner, and Fig. 3 is an outside air temperature and condensation of the individual air conditioner. A correlation diagram showing the pressure relationship, FIG. 4 is a plan configuration diagram of a conventional individual air conditioner. 22...Outdoor unit, 28...Outdoor heat exchanger, 29...Outdoor blower, 33...Outside air temperature sensor, 41... Defrost timer, 42...Four-way valve, 43...Relay for outdoor blower, 46...Switching thermostat. Name of agent: Patent attorney Toshio Nakao and 1 other person 2t
-...is an external machine

Claims (1)

[Claims] The outdoor unit side is equipped with an outdoor heat exchanger, an outdoor blower, and an outside air temperature sensor that senses the outside air temperature at a position on the suction side of the outdoor heat exchanger that does not affect sunlight, radiant heat, etc. An individual air conditioner comprising a multi-stage switching thermostat that switches the outdoor blower to multiple speeds using a temperature sensor.