JPS5930234Y2 - compressed air dehumidifier - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a compressed air dehumidifier.

A method of lowering the temperature of the compressed air to be dehumidified is widely used to remove moisture from compressed air, and a conventional dehumidifier for this purpose is constructed as shown in FIG.

That is, the evaporator 1, the compressor 2, the condenser 3, the expansion valve 4, and the condenser cooling fan 5 form a refrigerator, and the compressed air to be dehumidified obtained by the air compressor 6 is transferred to the evaporator 1. While leading from the inlet pipe 7 connected to the surrounding cooling chamber 8 to this cooling chamber 8, preliminary cooling is performed in the preliminary heat exchange chamber 9, and then cooling is performed in the cooling chamber 8, and after cooling, from the cooling chamber 8 to the preliminary heat exchange chamber The compressed air to be dehumidified led to the preheat exchange chamber 9 through the outlet pipe 10 connected to the preheat exchange chamber 9 is heated in the preheat exchange chamber 9 and taken out of the system.

In the conventional dehumidifier, heat is exchanged in the preliminary heat exchanger between the air before the compressed air to be dehumidified is cooled and the air after it has been cooled and dehumidified. Therefore, when high-temperature compressed air enters the cooling room from the preheat exchanger, as in the case where the compressed air to be dehumidified is led directly from the air compressor to the preheat exchanger, the dew point will be low. It is not possible to obtain high-temperature compressed air, and measures must be taken such as installing a forced cooler using a fan in front of the cooling room or increasing the capacity of the refrigerator.

This invention does not require a separate fan etc.
It is an object of the present invention to provide a compressed air dehumidifier that solves the above problems by using a fan in a conventional refrigerator.

This will be explained below based on a specific example.

The basic structure of the refrigerator, which consists of an evaporator 1, a compressor 2, a condenser 3, an expansion valve 4, and a condenser cooling fan 5, is the same in the present invention as in the conventional apparatus. On the side closer to the air compressor 6 than the preheat exchanger 9, the inlet pipe 7 is branched into a first passage 11 and a second passage 12 that bypasses the first passage 11. 1
1, a cooler 13 is installed separately, and the first passage 11 and the second
A flow rate control mechanism 14 is disposed at the entrance to the first passage 12.
The first passage 1 is located at the exit of the passage 11 and the second passage 12.
An inlet pipe 7 is provided as a third passage for guiding the compressed air to be dehumidified from the evaporator 1 to the evaporator 1.

The cooler 13 is arranged opposite to the condenser 3, and the condenser 3
The condenser cooling fan 5 forcibly cools the cooler 13.
It also cools down at the same time.

It is preferable that the condenser 3 is located upstream of the cooler 13 so that air is sent to the cooler 13 after passing through the condenser 3. When arranged in this way,
Even if the temperature of the compressed air guided to the cooler 13 changes, the refrigerating capacity is not affected, and dehumidified compressed air having the same dew point temperature can always be obtained.

The condenser cooling fan 5 may be of the delivery type as shown, or may be of the suction type.

In order to effectively cool the cooler 13, this cooler 1
3 and a condenser cooling fan 5 are disposed within the duct 15.

The flow rate control mechanism 14 controls the amount of air supplied to the cooler 13 according to the temperature of the air sent from the air compressor 6, and then when the air enters the cooling chamber 8 from the inlet pipe 7 via the preliminary heat exchanger 9. This keeps the air temperature almost constant.

In order to perform such a function, a temperature-sensitive valve is provided, which sets the opening degree of the valve by displacing itself depending on the temperature of the compressed air to be dehumidified sent from the air compressor 6. This can be done by changing the amount of compressed air supplied to the passage 11 and the second passage 12, or by configuring the flow rate control mechanism 14 with a temperature detector 16 and a switching valve 17 as shown in FIG. A temperature sensor 16 is attached to the inlet passage 18, and a signal from the temperature detector 16 switches the switching valve 17, so that when the temperature of the compressed air to be dehumidified is high, the compressed air is directed to the first passage 11 side and vice versa. In addition, when the temperature of the compressed air is low, measures such as selectively supplying the compressed air to the second passage 12 side may be taken.

As a result of the above configuration, the amount of compressed air diverted to the first passage 11 having the cooler 13 is controlled by the flow rate control mechanism 14 according to the temperature of the compressed air to be dehumidified supplied from the air compressor 6. Since the temperature of the compressed air passing through the inlet pipe 7 is almost constant, the temperature guided from the preheat exchanger 9 to the cooling chamber 8 hardly changes, and the compressed air having almost the same dew point is passed through the outlet pipe 10. It is possible to obtain compressed air that is taken out at a temperature of approximately the same temperature as the preheat exchanger 9 and further heated to approximately the same temperature.

According to the present invention, since the condenser cooling fan is used as is, the cost can be significantly reduced compared to a method in which such a fan is separately installed.

In addition, since forced cooling is performed using a fan, it is possible to cope with high compressed air temperatures without increasing the output of the refrigerator.Furthermore, the temperature of the compressed air led to the cooling chamber is virtually constant, so it remains constant. It is possible to obtain dehumidified compressed air with a dew point temperature of .

That is, according to the compressed air dehumidifier according to the present invention, as described above, in addition to the preliminary heat exchange chamber for exchanging heat between the compressed air to be dehumidified from the first passage and the compressed air dehumidified by the evaporator, A cooler and a second passage as a bypass passage are provided upstream of this chamber, and the amount of compressed air to be dehumidified supplied to the cooler is controlled by a flow rate control mechanism in accordance with the temperature of the compressed air to be dehumidified. The controlled dehumidified compressed air to the third passage in which the preheat exchange chamber is formed can thus be maintained at a desired constant temperature, thereby reducing the dehumidified compressed air discharged from the preheat exchange chamber. temperature can be kept constant, and dehumidified compressed air with a constant dew point temperature can be obtained.

In addition, according to the compressed air dehumidifying device of the present invention, which consists of a cooler operated by a condenser cooling fan, it is possible to achieve a significant cost reduction, and it is also compact, which increases the capacity of the refrigerator. The situation can also be avoided.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional dehumidifying device, FIG. 2 is an explanatory diagram of the dehumidifying device of the present invention, and FIG. 3 is an explanatory diagram of another specific example of the flow rate control mechanism. 1...Evaporator, 2...Compressor, 3...
...Condenser, 4...Expansion valve, 5...
・Condenser cooling fan, 6...Air compressor, 11
......first passage, 12...second passage, 13...cooler, 14...flow control mechanism, 16...・Temperature detector, 17...Switching valve.

Claims (1)

[Claims for Utility Model Registration] ■ A refrigerator having a compressor, a condenser, an evaporator, and a condenser cooling fan, a first passage to which compressed air to be dehumidified is supplied, and a first passage to which the compressed air to be dehumidified is supplied. dehumidified compressed air,
a cooler provided in a first passage facing the condenser to be cooled by a condenser cooling fan of the refrigerator;
a cooler provided in the passage, a second passage bypassed with respect to the cooler in the first passage, and a compressed temperature to be dehumidified to the cooler, corresponding to the temperature of the compressed air to be dehumidified. In response to this, a flow rate control mechanism for controlling the amount of compressed air to be dehumidified supplied to the cooler, and for exchanging heat between the compressed air to be dehumidified from the first passage and the compressed air dehumidified by the evaporator. , and a preliminary heat exchange chamber formed in a third passage that guides compressed air to be dehumidified from the first passage to an evaporator. 2. The compressed air dehumidifier according to claim 1, wherein the flow rate control mechanism includes a temperature-sensitive valve that sets the valve opening depending on the temperature of the compressed air to be dehumidified. 3. The flow rate control mechanism is defined in claim 1 of the utility model registration claim, which includes a temperature detector that detects the temperature of the compressed air to be dehumidified, and a switching valve that switches the valve based on the output from the temperature detector. Compressed air dehumidifier.