JPH06323650A - Annual operation type air-cooling chiller unit - Google Patents

Abstract

PURPOSE:To prevent rise of a high pressure of a refrigerating cycle. CONSTITUTION:An air side heat exchanger 1 has a speed control blower 3 and an operation/stop control blower 5. The speed of the blower 3 is controlled by, a speed control fan controller 7, and the blower 5 is controlled to be operated or stopped by an operation/stop control high pressure switch. An air side heat exchanger 2 has a speed control blower 4 and an operation/stop control blower 5 disposed reversely to those of the exchanger 1. Thus, an air flow rate bypass of cycles is reduced to a minimum limit to suppress hunting of the operation/stop blower 5, a high pressure of a specific value is maintained to operate a refrigerating cycle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an annual operation type air-cooling type chiller unit which requires annual operation of a computer, a plastic molding machine, and other industrial processes having a cooling load throughout the year.

[0002]

2. Description of the Related Art In a conventional apparatus, as described in Japanese Patent Laid-Open No. 4-6351, an air side heat exchanger that constitutes one refrigeration cycle is divided into two parts, left and right, and each refrigeration cycle is arranged in front and rear. Then, the blower control is performed so as to adjust the pressures of the left and right air side heat exchangers in one refrigeration cycle. Moreover, since the front and rear air side heat exchangers also have independent refrigeration cycles, the pressure adjustment of the front and rear air side heat exchangers is performed independently.

[0003]

When the air side heat exchangers of each refrigeration cycle are arranged on the left and right sides, the left and right air side heat exchangers are affected by the seasonal wind from one direction even if the compressor is operating with the same capacity. A difference occurs in the refrigerant condensing performance in the exchanger, causing an imbalance in the high pressures of the left and right refrigeration cycles. Also, when the compressor is operating at maximum capacity in one refrigeration cycle and less than half capacity in the other refrigeration cycle, there is a difference in refrigerant condensing performance in the left and right air side heat exchangers due to the influence of the refrigerant circulation amount. Occurs, and the high pressures of the left and right refrigeration cycles are unbalanced. Therefore, it is necessary to control the pressure for each of the left and right air side heat exchangers. Also, when one refrigeration cycle is stopped, the pressure does not rise in that refrigeration cycle, so it is not necessary to operate the blower of that refrigeration cycle either, but if all the blowers of that cycle are stopped, another The blower of the refrigeration cycle needs to be operated. However, since the air bypasses the blower that is operating or the blower that is stopped, the amount of air passing through the air-side heat exchanger on the operating side decreases, and the pressure of the refrigeration cycle rises, It is also necessary to solve this pressure rise prevention.

[0004]

In order to achieve the above-mentioned object, the present invention is to control the stoppage of operation of all the blowers constituted for each of the left and right refrigeration cycles, that is, for each of the left and right air side heat exchangers. The rotation speed is controlled to control the pressure of the refrigeration cycle. In this control, if full rotation stop control by the pressure switch is performed, the operating pressure rises excessively or hunting for full operation stop is performed, so one blower for each refrigeration cycle takes a means for controlling the rotation speed. . The rest of the blower is controlled by a pressure switch to stop the operation. If the fans for controlling the rotation speed and for controlling the full rotation stop are arranged symmetrically, the amount of the bypassed wind from the blower increases, so that the total air volume is adjusted by the rotation speed of the fan for controlling the rotation as anti-symmetric. Also, when one refrigeration cycle is stopped, the high-pressure does not rise, so it is not necessary to operate the blower of that cycle, but when stopped, the air volume of the blower of the other refrigeration cycle is bypassed, so at this time It is also necessary to operate the blower of the refrigeration cycle that is stopped. The blower is rotated by using the B contact of the electromagnetic contactor of the compressor which is stopped.

[0005]

[Function] One fan controller arranged for each refrigeration cycle, that is, for each air side heat exchanger adjusts the amount of air passing through the air side heat exchanger by controlling the rotation speed of the blower,
The high-pressure pressure switch controls full rotation only when the high-pressure pressure of the refrigeration cycle rises, and conversely, when the high-pressure pressure drops below a certain pressure, the blower is stopped and the air volume passing through the air-side heat exchanger is adjusted. In addition, since the fan whose speed is controlled is arranged in the opposite direction, the bypassed air volume from the stopped fan speeds up the rotation of the blower for the speed control next to it, increasing the air volume, so the high pressure due to the bypass It won't rise too high. Further, when one of the refrigeration cycles is stopped, the blower rotates in response to the stop signal of the compressor, so that the high pressure of the refrigeration cycle operating without bypassing does not rise too much.

[0006]

[Embodiment] The method for controlling the rotation speed of a blower is to read the high pressure and the refrigerant liquid outlet temperature of the air side heat exchanger, convert the high pressure to a temperature, and perform the difference between the temperature conversion value and the refrigerant liquid outlet temperature. , Or one of the upper and lower limits of the high pressure, or one of the upper and lower limits of the refrigerant outlet temperature of the air side heat exchanger. Although it is conceivable, the explanation will be given by using one range of the upper limit value and the lower limit value of the high pressure, which is the most general and easy one. There is no difference between these types.

An embodiment of the present invention will be described below with reference to FIG. Further, FIG. 2 shows the position of the blower for controlling the rotation speed and controlling the full rotation / stop arranged in the air side heat exchanger. FIG. 3 is an embodiment of an operation circuit diagram for rotating the blower by a compressor stop signal when one refrigeration cycle is stopped.

When the outside air temperature is high, the high pressure rises, so that the pressure exceeds the set pressure. Therefore, the circuit for controlling the rotation speed controls the full rotation and the circuit for controlling the operation stop controls the operation. That is, all the blowers are operated at full rotation, but when the outside air temperature drops and the seasonal wind passes through the air side heat exchanger of one refrigeration cycle and the high pressure side of that cycle drops, and easy control is performed. When the high pressure drops during operation, it is necessary to adjust the air volume to maintain the high pressure above a certain level. In the present invention, the air side heat exchanger 1
When the high pressure of is decreased, the rotation speed control fan controller 7 connected to the gas inlet side of the air side heat exchanger 1 detects the pressure and lowers the rotation speed of the rotation speed control blower 3 to reduce the high pressure. To raise. Even if the number of rotations is reduced, when the high pressure still drops and reaches the OFF set value of the high pressure switch 9, the electric contact moves and the operation stop blower 5 stops. When this stops, the air volume suddenly decreases and the high pressure of the refrigeration cycle rises. When this high pressure rises, the rotation speed control fan controller 7 detects again,
The rotation speed of the rotation speed control blower 3 is increased to increase the air volume, and the high pressure is slightly decreased. At this time, similarly, the air side heat exchanger 2 is operated while maintaining a constant high pressure when the rotation speed of the rotation speed control blower 4 is lowered. Since the operation stop control blower 5 is stopped, the rotation speed control blower 4 which constitutes this heat exchanger in the air side heat exchanger 2 bypasses the air flow heat exchanger 2 because the air volume bypasses the stop air blower 5. The amount of air passing through is reduced and the high pressure of the refrigeration cycle is increased. Then, the rotation speed control fan controller 8 detects the rotation speed, and the rotation speed control blower 4 operates in a balanced manner when the rotation speed increases and the high-pressure pressure in the cycle slightly decreases. On the contrary, when the air-side heat exchanger 2 lowers the high-pressure pressure first, the above-mentioned operations are mainly performed (reverse operations). Further, when one of the refrigeration cycles is stopped and if the compressor of the air-side heat exchanger 2 is stopped, the high pressure of the cycle does not rise at all, so the rotation speed control blower 4 and the operation stop control are performed. Since the blower 6 is controlled to be in a stopped state, the blower of the air-side heat exchanger 1 bypasses air from the blower in which the refrigeration cycle is stopped, and the high pressure of the refrigeration cycle rises. Therefore, the B contact 11 of the compressor electromagnetic switch is closed, and the operation stop control blower 6
To prevent the bypass of the blower of the refrigeration cycle. When the compressor of the refrigeration cycle is stopped, the above-mentioned reverse operation is performed.

[0009]

When the high pressure of one refrigerating cycle is lowered, the high pressure switch is opened, the operation stop control blower is stopped, the air volume is decreased, and the high pressure is increased. When the high-pressure pressure rises, the rotation-speed control fan controller increases the rotation speed of the rotation-speed control blower by the amount of the pressure increase, so that the high-pressure pressure balances at a place where it falls a little. At this time, in the other refrigeration cycle, the air volume bypasses from the blower stopped on the one refrigeration cycle side and the air volume passing through the air side heat exchanger of the other refrigeration cycle decreases, so the other refrigeration cycle has a high pressure. Is increased, and the rotation speed control blower of the refrigeration cycle is controlled to increase the rotation speed to increase the air volume of the cycle and gradually reduce the high pressure to balance it. Therefore, both refrigeration cycles finely adjust the air volume by increasing / decreasing the rotation speed of the rotation speed control blower, so that there is an effect that the high pressure is maintained within a certain range for operation.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a blower control of an air side heat exchanger.

FIG. 2 is a layout view of an air-side heat exchanger blower.

FIG. 3 is a blower control operation circuit diagram.

[Explanation of symbols]

1, 2 ... Air side heat exchanger, 3, 4 ... Rotation speed control blower,
5, 6 ... Operation stop control blower, 7, 8 ... Rotation speed control fan controller, 9, 10 ... Operation stop control high-pressure pressure switch, 11, 12 ... B contact of the compressor electromagnetic switch.

Claims (1)

[Claims] 1. An independent two refrigeration cycle, one integrated air-side heat exchanger and a plurality of blowers are arranged on the left and right sides so as to form a refrigeration cycle, and a compressor corresponding to them is provided. In a refrigeration system consisting of an expansion valve and a water cooler, one of a plurality of blowers for each refrigeration cycle reads the high-pressure pressure and the refrigerant liquid outlet temperature of the air-side heat exchanger, converts the high-pressure pressure into a temperature, and then reads that temperature. A fan controller for controlling the rotation speed of the blower by the difference between the converted value and the refrigerant outlet temperature, or a fan controller for controlling the rotation speed of the blower within one of the upper limit value and the lower limit value of the high pressure, or the air side heat exchanger. One of the fan controllers that controls the rotation speed of the blower within one range of the upper limit value and the lower limit value of the refrigerant liquid outlet temperature of All blowers are equipped with a high-pressure pressure switch for each refrigeration cycle and for each blower.When the pressure exceeds a set pressure, the blower closes and the blower is fully rotated. When the pressure becomes lower by the differential pressure, it opens to control the blower to stop, and the rotation speed control and full rotation / stop control of the blower are arranged on the left and right air side heat exchangers, and the left and right sides are reversed. , When the compressor of one refrigeration cycle is stopped, the B contact of the auxiliary contact of the electromagnetic contactor that controls the stop of the compressor is used to control only the blower that is operated and stopped by opening and closing the pressure switch to fully rotate. Annual operation type air-cooled chiller unit characterized by performing.