JPH02254263A - Capacity control device for refrigerating plant - Google Patents

Abstract

PURPOSE:To prevent lowering of refrigerant capacity through enough and high- efficient ensurance of the condensing pressure of a refrigerant even at a low open air temperature period by a method wherein a capacitor is divided into a plurality of capacitor elements which are arranged in positions, having different air flows, in a ventilating passage, and a refrigerant bypass circuit bypassing the capacitor element having a high airflow is mounted at a freezing cycle. CONSTITUTION:A capacitor 13 provided in an outdoor unit casing is divided into a plurality of capacitor elements, i.e., two capacitor elements 13a and 13b. The one capacitor element 13a is disposed as an upper capacitor at the portion, where an airflow is high, of a ventilating passage 22, and the other capacitor element 13b is disposed as a lower capacitor at a position where an airflow is low. On the other hand, a refrigerant bypass circuit 26 mounted at a freezing cycle 24 is mounted in a manner to bypass the upper capacitor 13a having a high airflow, and a 2-way valve 27 serving as a bypass valve is mounted in the middle of the refrigerant bypass circuit. This constitution causes enough and high-efficient ensurance of the condensing pressure of a refrigerant even et a low open air temperature period and prevents lowering of freezing capacity.

Description

[Detailed Description of the Invention] (Objective of the Invention) (Industrial Application Field) This invention relates to a capacity υJilt system of a refrigeration system d used in air conditioners and various types of refrigeration machines, especially at low outside temperatures. Capacity of refrigeration equipment designed to ensure refrigerant condensation pressure ff1
Regarding the tI11 control device.

(Prior Art) Refrigeration cycles are incorporated in air conditioners and various types of refrigeration machines. A refrigeration system equipped with this refrigeration cycle houses a compressor 1, a condenser 2, a receiver tank 3, an outdoor fan 4, etc. in a unit casing of an outdoor unit, as shown in FIG. Reference numeral 5 is an accumulator. The capacitor 2 includes two capacitor elements (m1 capacitor 2a, second capacitor 2b) 2a.

2b, a first and a second capacitor 2a.

2b is arranged in the ventilation passage 6 inside the outdoor unit casing. A refrigerant bypass circuit 7 is provided in the refrigeration cycle 8 so as to bypass the first refrigerant 2a, and this bypass circuit 7 is provided with a two-way valve 9 as a bypass valve.

In this refrigeration system, the capacity and weight control 11 of the condenser 2 is controlled by the opening and closing of the two-way valve 9 and the fan control of the outdoor fan 4.
94a at a rotational speed of tillllll, thereby controlling the refrigeration condensation pressure horn of the condenser 2 to i, II I
I am doing II. Specifically, the cold that circulates within the refrigeration cycle 8! ! ! The temperature is detected by a temperature sensor, and this temperature sensor is used to gradually adjust the rotation speed of the fan motor 4a of the outdoor fan 4, the capacity of the refrigerator 2, and the capacity of the refrigeration system υ1. .

(Problems to be Solved by the Invention) In the conventional refrigeration system, the capacity of condensate +j2 is controlled by opening and closing the two-way valve 9. This allows the refrigerant discharged from the compressor 1 to bypass the first condenser 2a! ' to the second condenser 2b, where it is condensed.

However, in the conventional refrigeration system, the condenser 2 is arranged in the ventilation passage 6 of the outdoor 1-nit casing so that the passage 11ffi of the first condenser 2a and the second condenser 2b are almost equal, and the second condenser 2b is There are many 71s passing through. For this reason, the first condenser 2a is bypassed and the refrigerant discharged from the b1 combiner I2 is condensed in the second condenser with a large air volume, so it is necessary to ensure sufficient condensation pressure of the refrigerant. In particular, low outside air 1
Sometimes it is not possible to secure sufficient condensation pressure of the refrigerant,
Since the condensing pressure decreases, there are problems such as a decrease in refrigerating capacity.

This invention was made in consideration of the above-mentioned circumstances, and it ensures sufficient and efficient condensation pressure of the refrigerant even at low outside temperatures.
An object of the present invention is to provide a capacity control device for a refrigeration system that prevents a decrease in refrigerant capacity.

[Structure of the invention]

(Means for Solving the Problems) Capacity control equipment for the refrigeration system according to the present invention (1. In order to solve the above problems, the compressor, condenser, etc. that constitute the refrigeration cycle are installed in the outdoor unit i/casing. In the capacity control device for a refrigeration system, the capacitor is arranged in a ventilation passage in the outdoor unit casing. IJ
The refrigeration cycle is provided with a refrigerant bypass circuit that bypasses the condenser element with a large amount of H2t.

In addition, in order to solve the problems faced by the prior art, in the control device for the refrigeration equipment according to the present invention, the outdoor unit cushing is formed into a side suction, upward blowing type, and
2 minutes v! The capacitor housed in the above outdoor unit cushioning! The refrigeration cycle is equipped with a refrigerant bypass circuit that bypasses the upper condenser element.

(Function) The capacity control I device of this refrigeration equipment divides the condenser placed in the ventilation passage in the outdoor unit I-casing into a plurality of condenser elements, and at the same time places each condenser element in the space where the volume is controlled. Since the refrigerant bypass circuit is provided so as to bypass the condenser element having a large amount of water, the refrigerant discharged from the compressor 13+r etc. 01 can be directly guided to the condenser element having a small amount of Jul.

By bypassing the condenser element with high ff1M and guiding the discharged refrigerant from the compressor to the condenser element with low ff1ffl, the condensing pressure of the refrigerant can be secured sufficiently efficiently in the condenser even at low outside temperatures, and the refrigeration capacity can be increased. It is possible to prevent deterioration and maintain sufficient reliability of refrigeration.

(Embodiment) Hereinafter, an embodiment of capacity control of a refrigeration system according to the present invention will be described with reference to the accompanying drawings.

1 and 2 show an outdoor unit 10 of a refrigeration system used for air conditioners and various types of refrigeration machines. The outdoor fans 16 and the like are housed respectively. Of these, 12 Mbre Nosa, 1 receiver tank.
4 and the accumulator 15 are arranged at the bottom of the outdoor unit casing 11 (machine room 18), and the capacitor 13
is the middle part of the outdoor unit casing 11 (heat exchange chamber 19
), and an outdoor fan 16 is provided on the top of the unit casing 11. Outdoor unit casing 1
The inside of unit casing 1 is of a side suction, upward blowing type, and inside this unit casing 11, there is a passage 22 extending from the front air suction port 20 to the air blowout port 21 in an approximately dogleg shape or L shape.
Formed in a letter shape.

On the other hand, an accumulator 15, a compressor 12, a condenser 13, and a receiver tank 14 housed in the outdoor unit casing 11 are connected in sequence to constitute the outdoor side of the refrigeration leak 24.

This refrigeration cycle 24 has a packed valve 25a.

It is connected to the indoor side of the refrigeration cycle via 25b.

Further, the capacitor 13 disposed inside the outdoor unit casing 11 is divided into a plurality of capacitor elements, two capacitor elements 73a and 13b in FIG. part and the other 1
3bG is installed as a lower capacitor in the area with low air volume.

In this way, each element 1 to 13a of the capacitor 13.

13b are provided at different positions of ff1ffl in the ventilation passage 22.

On the other hand, the refrigeration cycle 24 is provided with a cold tofu bypass circuit 26 shown in FIG. This refrigerant bypass circuit 26 is provided so as to bypass the upper condenser 1321 with a large amount of Jl, and a two-way valve 27 as a bypass valve is provided in the middle thereof.

Further, a thermostat 30.31.32 is installed as a temperature sensor on the downstream side of the condenser 12 (another position may be used) in the refrigeration cycle 24, for example. - As shown in Figure 1, the operation of the fan 16a of the outdoor fan 16 and the two-way valve 27 of the refrigerant bypass circuit 26 is controlled by υj. Compressor 12 is Ti... 0 due to opening/closing of Kaikai Shinobu 33 i11
N-OFF. Note that the reference numeral 34 is a capacitor for the fan motor 16a of the outdoor fan 16.

The thermostats 30, 31.32 are divided into a small number of temperature zones A, B, C, and D according to the outside temperature. When the outside temperature is high and belongs to zone A, the thermostats 1-32.30
(by outdoor)? The fan motor 16a of the fan 16 is driven at high speed.

When detecting the outside temperature in zone B, thermostat 30
is activated to drive the fan motor 16a at a low speed. In addition, when the outside temperature is low and belongs to the C zone, the thermostat 31 operates to close the two-way valve 27 of the refrigerant bypass circuit 26, and the refrigerant discharged from the compressor 12 bypasses the upper condenser 13a and reaches the lower condenser. It is designed to be directly discharged to 13b.

When the outside temperature is WA/11, which belongs to zone C, the thermostat 32 is activated. This prevents the drive of the main motor 15a from being stopped.

Next, the operation of capacity control equipment for the refrigeration system will be explained.

This refrigeration device uses the outside temperature as a temperature sensor! -30, 31, and 32 when the outside temperature is high, the fan motor 16a of the outdoor fan 16 is driven to rotate at high speed, and when the outside temperature becomes low, it is switched to low speed rotation. Furthermore, when the outside temperature becomes lower, the two-way valve 27 of the refrigerant bypass circuit 26 is closed, and the refrigerant discharged from the compressor 12 bypasses the upper condenser 13a and is guided to the lower condenser 13b. At that time, lower capacitor 1
3b is located in the outdoor unit casing 11) in the ventilation passage 22 with less a, so that the heat exchange k in this lower condenser i3a can be reduced.

Thereby, the condensing pressure of the discharged refrigerant can be increased by 1, and the condensing pressure of the refrigerant can be ensured sufficiently and efficiently.

Furthermore, when the outside temperature is extremely hot in the C zone,
The outdoor fan 16 is stopped to prevent the condensation pressure of the refrigerant from decreasing.

In one embodiment of the present invention, the outdoor unit casing has been described as having side suction and upward blowing, but the outdoor unit casing is not limited to this type. It is also possible to use one type of blowout from either side. In either case,
The capacitor is divided into a plurality of capacitor elements v1, and at least one of each condenser element is arranged in a portion of the ventilation passage with less wind.

(Effect of the invention) As described above, the capacity (li
In the ill III gas charging system, the condenser is divided into multiple condenser elements and placed at different positions in the ventilation path, and a refrigerant bypass circuit is installed in the refrigeration cycle to bypass the condenser element with a large air volume, so that the air flow from the compressor is reduced. By flowing the discharged refrigerant so as to bypass the condenser element with a large ff1fi, sufficient and efficient condensation pressure of the refrigerant can be ensured even in low outside temperature patches, and a decrease in refrigeration capacity can be effectively prevented, so the refrigeration The reliability of the device can be maintained sufficiently.

[Brief explanation of drawings]

Figure 1 t, capacity of refrigeration system r according to this invention ff1i/Jl
l! FIG. 2 is a front view of the outdoor unit of the refrigeration device, and FIG. 3 is a refrigeration cycle diagram showing the capacity control device of the refrigeration device of the present invention. , Fig. 4 is a control circuit diagram for controlling the refrigeration cycle shown in Fig. 3, Fig. 5 is a diagram showing the relationship between outside temperature and refrigerant pressure, and Fig. 6 is a diagram showing the capacity control of a conventional refrigeration system. It is a refrigeration cycle diagram showing the apparatus. 10... Outdoor unit, 11... Outdoor unit casing, 12... Compressor, 13... Condenser, 13a, 13b... Condenser element (L side condenser, lower side capacitor), 15... Akicomulator, 16... Outdoor fan, 16a... Fan motor, 20... Air intake port, 21... Air outlet, 2
2... Ventilation duct, 24... Refrigeration cycle, 26...
Refrigerant bypass circuit, 27... two-way valve, 30.31.3
2...Thermostat (temperature sensor).

Claims (1)

[Scope of Claims] 1. A capacity control device for a refrigeration system in which a compressor, a condenser, etc. constituting a refrigeration cycle are housed in an outdoor unit casing, and the condenser is disposed in a ventilation path in the outdoor unit casing, A capacity control device for a refrigeration system, characterized in that the refrigeration cycle is provided with a refrigerant bypass circuit that bypasses the condenser element with a large air volume, by dividing the refrigerant into a plurality of condenser elements and disposing them at positions with different air volumes in the ventilation path. 2. The outdoor unit casing is formed into a side suction, upward blowout type, and the condenser accommodated in the outdoor unit casing is divided into two parts, and a refrigerant bypass circuit is provided in the refrigeration cycle to bypass the upper condenser element. 1. A capacity control device for a refrigeration device according to 1.