JPS6115096A - Drive control system of air cooled type heat exchanger - Google Patents

Abstract

PURPOSE:To secure the quantity of air current enough for substantially keeping a required heat-exchange ability by a procedure in which when one of a plurality of air feeding fans is in a fault, the remaining fans are changed over to high speed driving. CONSTITUTION:In a case where one of the air feeding fans 42a and 42b gets fault and stops its operation, an output from a rotational speed detecting sensor such as a tachometer disposed on the rotational shaft of the fan is used as an input signal to carry out a fault detection, relay contacts 6a and 6b are opened, and the fans on the fault side is removed from a power supply circuit, and a control signal is applied to an inverter 7. The output frequency is raised, and the remaining sound fans are rotated at high speeds and a quantity of air flow substantially equals to that obtained by all of the fans, can be secured.

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

This invention can be used, for example, as an air-cooled radiator that is incorporated into a cooling system that employs a water cooler to radiate the heat generated by the heat load absorbed by the water cooler into the atmosphere, or as an air-cooled condenser unit of a refrigerator. This invention relates to an operation control method for a type heat exchanger.

[Prior art and its problems]

First, Fig. 3 shows the configuration of a conventional air-cooled heat exchanger incorporated in a cooling system including a water cooler.
A water circulation line 4 including a water pump 3 is an air-cooled heat exchanger to which the present invention is applied. The conventional configuration of the air-cooled heat exchanger 4 includes a finned tube-shaped heat exchanger body 41 and a blower fan 42 attached to the heat exchanger body 41.
It consists of Note that 43 is a fan motor, which is operated by receiving power from a power supply circuit (not shown). The operation of such an air-cooled heat exchanger is well known, and pump 3.
By operating the fan 42, the heat of the thermal load absorbed by the water cooler 2 is sent to the air-cooled heat exchanger 4 by the pump 3 using water as a medium, where it exchanges heat with the air and radiates the heat into the atmosphere. be done. By the way, in the conventional configuration described above, if the fan 42 of the air-cooled heat exchanger 4 breaks down during operation, the supply of cooling air to the heat exchanger body 41 is lost and the heat exchanger becomes a natural heat dissipation system, which reduces the heat exchange capacity. will drop significantly. In this case, if the heat load is severe in operating temperature conditions such as electronic equipment, a failure of the air-cooled heat exchanger 4 will directly affect the interruption of operation of the electronic equipment, which is fatal. For this reason, in the past, a spare air-cooled heat exchanger 4° was prepared as shown in the diagram in case of an emergency, and if a failure occurred in the air-cooled heat exchanger during operation, it could be used immediately. Switch the valve,
A redundant system is used to continue operating the cooling system using a spare air-cooled heat exchanger. In the example shown in Figure 3, the blower fan attached to the air-cooled heat exchanger is configured with one unit, but if the air-cooled heat exchanger is configured with two units, However, if one of the two units breaks down, the heat exchange capacity will be reduced by half, making it difficult to continue operating the cooling system as is, as in the illustrated example.

[Purpose of the invention]

This invention was made in consideration of the above points, and its purpose is to ensure that even if one blower fan fails during operation of an air-cooled heat exchanger, the remaining blower fans can continue to maintain the required heat exchange capacity. An object of the present invention is to provide a highly redundant operation control system for an air-cooled heat exchanger that can secure a sufficient amount of air to maintain almost the same amount of air.

[Key points of the invention]

In order to achieve the above object, this invention divides the blower fans of an air-cooled heat exchanger into a plurality of units, configures an independent blower passage for each blower fan, and arranges them in parallel in the heat exchanger body. During operation, all the blower fans are operated to blow the required air volume, and if one of the blower fans breaks down, the remaining fans are switched to high-speed operation to generate an air volume close to the required air volume. This ensures continuous operation of the heat exchanger.

[Embodiments of the invention]

1 and 2 show a configuration diagram and an operation control circuit diagram of an air-cooled heat exchanger according to an embodiment of the present invention, and the same reference numerals as in FIG. 3 indicate the same parts. In the figure, a reference numeral 42 is used as a blower fan of the air-cooled heat exchanger 4.
A plurality of blower fans indicated by a and 42b are connected to the heat exchanger main body 4.
They are arranged side by side on the upper part of the heat exchanger 1 in a wind cylinder 5 that communicates with the heat exchanger main body. In addition, the wind body 5 has each blower fan 42.
The interior thereof is partitioned by a partition wall 51 so as to define an independent air passage for each of the air passages 42a and 42b. on the other hand,
The operation control circuit for the blower fans 42a and 42b is a second
It is configured as shown in the figure. In this figure, fan motors 43a and 43b are induction motors,
The power supply circuit of the fan motor includes a relay contact 6a that cuts off the power supply to the fan motor in the event of a failure of the blower fan;
6b, an inverter 7 for controlling the frequency of power supplied to the fan motor is inserted and connected as a rotation speed control means for the blowing fan. Note that 8 is a blower fan operation switch. In addition, as a failure detection means for each of the blower fans 42a and 42b, for example, the output of a rotation speed detection sensor such as a tachometer installed on the rotation axis of each blower fan is used as an input signal to detect when the blower fan fails and stops. It is equipped with a controller 10 that performs failure detection, disconnects the relay contacts 6a and 6b, and provides a control signal to the inverter 7 to increase the output frequency. With the above configuration, during normal operation, two blower fans 4
2a and 42b are operated together to supply the required air volume to the heat exchanger main body 41. If for some reason one of the blower fans 42a, 42b should fail and the fan should stop while the heat exchanger 4 is operating,
The stop condition is immediately detected and the relay contacts open,
The blower fan on the faulty side is removed from the power supply circuit, and a control signal is given to the inverter 7 to increase its output frequency. As a result, the remaining healthy blower fans rotate at high speed, and it is possible to secure an air volume that is almost close to the air volume obtained by the two blower fans during normal operation. As a result, almost a predetermined heat exchange capacity can be maintained until the failed blower fan is repaired or replaced with a new one, and the operation of the heat exchanger 4 can be continued without causing any trouble to the cooling system. In the illustrated embodiment, an inverter that changes the power supply frequency is used as the rotation speed control means of the fan motor, but it is also possible to use a voltage control device that changes the power supply voltage as the rotation speed control means, or to A variable speed motor may be employed to switch between high and low speeds, and the number of blowing fans is not limited to two, but may be divided into three or more.

【Effect of the invention】

As described above, according to the present invention, the blower fans of an air-cooled heat exchanger are divided into a plurality of units, and each blower fan has an independent air passage, and is arranged in parallel in the heat exchanger body. During operation, all the blower fans are operated to blow the required air volume, and if one of the blower fans breaks down, the remaining fans are switched to high-speed operation to generate an air volume that is close to the required air volume. By controlling the operation so that the heat exchanger continues to operate while ensuring the Redundant operation is now possible with air-cooled heat exchangers of It is possible to provide an excellent operation control method for air-cooled heat exchangers incorporated in cooling systems.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an air-cooled heat exchanger according to an embodiment of the present invention shown together with a cooling system, Fig. 2 is an operation control circuit diagram of the air-cooled heat exchanger of Fig. 1, and Fig. 3 is a conventional FIG. 2 is a configuration circuit diagram of a cooling system together with an air-cooled heat exchanger. 4: Air-cooled heat exchanger, 41: Heat exchanger main body, 42a. 42b: Blowing fan, 43a, 43b: 777 motor, 5: Wind cylinder of blowing fan, 51: Partition wall of wind cylinder, 9:
Inverter as rotation speed control means of the blower fan, lO:
Blow fan failure detection means. 1st U a21i≧5

Claims (1)

[Claims] 1) A blower fan is provided in the heat exchanger body through which the refrigerant flows, and the blower fan is operated to blow cooling air to the heat exchanger body to exchange heat with the refrigerant. An operation control method for an air-cooled heat exchanger, in which the blower fans of the air-cooled heat exchanger are divided into a plurality of units, and each blower fan has an independent air passage and is arranged in parallel in the heat exchanger body. In addition, during normal operation, all the blower fans are operated to blow the required air volume, and when one of the blower fans fails, the remaining fans are switched to high-speed operation to generate the required air volume. An operation control method for air-cooled heat exchangers that is characterized by ensuring continuous operation of the heat exchanger while ensuring an air volume close to . 2) In the operation control method according to claim 1, each blower fan is equipped with a fan failure detection means,
In addition, the fan motor power supply circuit of the ventilation fan increases the power supply voltage or frequency to the fan motors of the remaining healthy ventilation fans excluding the failed ventilation fan, based on the failure detection signal obtained by the failure detection means. Alternatively, an operation control method for an air-cooled heat exchanger, comprising a control means for switching a terminal of a variable speed motor to switch a fan motor of a healthy side blower fan to high speed rotation.