JPH0124531B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dryer device for a compressor, and in particular, in a dryer device using an adsorption cylinder, the adsorption cylinder, which is saturated with moisture absorption, is regenerated by heating with the heat held in the discharge pressure from the compressor. The present invention also relates to a compressor dryer device that can automatically switch between a regenerated adsorption cylinder and an adsorption cylinder in a saturated moisture absorption state by integrating the load time from the air supply pressure of the compressor.

Generally, a plurality of adsorption cylinders are arranged in parallel in the discharge pipe of a compressor, and some of the adsorption cylinders are used for the moisture absorption process, while the other adsorption cylinders that are saturated with moisture absorption are regenerated by heating. A drying device for a compressor is known in which an adsorption cylinder in a moisture absorption process is replaced with a regenerated adsorption cylinder upon completion of a heating regeneration process.

An example of this conventional device is shown in FIG. 1, and its problems will be described in detail.

An aftercooler 2 and a drain separator 3 are interposed in the discharge pipe 5 of the compressor 1, and the pipe is branched on the downstream side via a switching valve 4, and these branch pipes 6
A suction tube 7 is provided in each of the two. Further, a heating means 10 is provided which heats the air blown from the blower 8 with a heater 9 and introduces the hot air into each suction tube 7 .

Therefore, the pressurized air from the compressor 1 is cooled by the aftercooler 2, and the drain is separated by the drain separator 3. The drain is separated and the cooled pressure air is dried by the switching valve 4 while passing through the adsorption cylinder 7 which has been heated and regenerated, and is transferred to the load equipment 11 outside the system.

On the other hand, the adsorption cylinder 7b, which has become saturated with moisture absorption, is heated and regenerated by the hot air sent from the heating means 10, and this hot air flows out of the adsorption cylinder 7b. In this way, pressure from the compressor 1 is introduced into the adsorption cylinder 7b which has been heated and regenerated by the heating means 10 to replace the adsorption cylinder 7a which has been previously used for moisture absorption. With the introduction of pressurized air in this manner, the adsorption cylinder 7b enters the moisture absorption process.

By the way, the pressure air discharged from the compressor is generally at a high temperature of about 110 to 170 degrees Celsius, and conventionally, the pressure air at such a high temperature was cooled to about 40 degrees Celsius in an aftercooler.
It was sent to the adsorption cylinder after being cooled to ℃, and this heat was not used effectively. In addition, a heating means is required to heat and regenerate the adsorption column, which increases the equipment cost and power cost, which is not preferable from an energy saving measure.

In addition, because multiple adsorption cylinders installed in parallel were divided into one for the moisture absorption process and one for the regeneration process, and when replacing these processes, mechanical switching was required at each preset operating time, the limit of the moisture absorption capacity of the adsorption cylinders was reached. There was a risk that humid pressure air that had not been sufficiently dried would be transferred to load equipment outside the system, such as when the temperature exceeded the temperature or the moisture absorption step was started before heating and regeneration was completely completed. (For example, JP-A-54-121461, JP-A-54-109667) Therefore, the present invention was devised to effectively solve the problems in conventional dryer devices of this type.

The object of the present invention is to be able to regenerate the adsorption cylinder without using heating means from outside the system, to set the optimal switching point between regeneration and moisture absorption, and to be able to automatically switch and adjust the capacity. Provides compressor dryer equipment.

In order to achieve the above objectives, the adsorption cylinder is heated and regenerated using the heat held in the pressure of the compressor, and the time when the supply air pressure is higher than a preset value is detected and the integral value is calculated. When the integrated value reaches a value determined by the degree of regeneration of the load in the regeneration process and the moisture absorption capacity in the moisture absorption process, it was found that the functions of these adsorption cylinders should be replaced. As a result, the present invention was completed.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, a receiver 12 is interposed in the discharge pipe 5 of the compressor 1 to absorb the pulsation of the supply air, and branch pipes 13 and 14 are provided on the downstream side to be branched into two. Continuously installed. These branch pipes 1
Adsorption cylinders 15 and 16 are provided in each of the cylinders 3 and 14, respectively. A first switching valve 17 is provided at the branch point between the discharge pipe 5 and the branch pipes 13 and 14, and this switching valve 17 directs the high temperature pressure air from the compressor 1 to either one of the adsorption cylinders 15 or 16. It is constituted by an electromagnetic four-way valve having at least two valve parts, which has the function of introducing dry pressure air and simultaneously taking dry pressure air out of the system from the other adsorption cylinder 16 or 15 as described later. At the outlet 18 of the adsorption cylinder 15 or 16 which is being heated and regenerated by the introduction of high-temperature pressure air from the compressor 1, there is a drain separation device that cools the pressure air that has passed through the adsorption cylinder and removes condensate from the cooled pressure air. 19 is connected via a second switching valve 20.

The separator 19 mainly includes a cooler 21 that cools the pressure air that has passed through the adsorption cylinder, and a cyclone 22 that removes drain from the pressure air that has been cooled by the cooler 21.

Further, the second switching valve 20 transfers the pressurized air discharged from the adsorption column (in the illustrated example, the adsorption column 15) during heating and regeneration to the drain separator 19, and simultaneously removes the drain from the drain separator 19. It is formed by an electromagnetic four-way valve having at least two valve parts configured to transfer the pressurized air to another adsorption cylinder 16 that has been heated and regenerated.

A dry pressurized air transfer path 23 is connected to the first switching valve 17 for transferring dry pressurized air from the adsorption cylinder 16 which is in the process of absorbing moisture to a load device outside the system. Therefore, through the first switching valve 17, either one of the adsorption cylinders 16 or 15 during the moisture absorption process is
The outlet and the dry pressure air transfer path 23 will be automatically connected.

Next, in the present invention, the switching control means 24 that switches between the first switching valve 17 and the second switching valve 20 is a supply pressure detector that specifically detects the amount of pressurized air supplied from the compressor 1. 25 and an integral controller 26 that integrates the load time of the compressor 1 from the supply pressure detector 25.
It is composed of: Air supply pressure detector 25
is constituted by a pressure switch provided in the receiver 12, and the output side of this pressure switch is also connected to the control input sides of the suction valve 101 and the discharge valve 102 of the compressor 1. Note that 27 in the figure is a filter provided at the suction port 28 of the compressor 1. Furthermore, the integral controller 26 is configured to be able to perform integral control using only the integral when the compressor is loaded, without measuring the flow rate, using the air supply pressure detector 25.

The operation of this embodiment having the above configuration will be explained. In the illustrated example, the adsorption cylinder 16 on the right side is in the moisture absorption process, and the adsorption cylinder 15 on the left side is in the heating regeneration process. In this state, the first switching valve 17 and the second switching valve 20 are set in the direction shown by the solid line. By setting the switching valves 17 and 20 in this manner, high-temperature pressure air (160 to 170°C) from the compressor 1 is directly introduced through the receiver 12 into the adsorption cylinder 15 which is saturated with moisture absorption, and the adsorption cylinder 15 absorbs this high temperature. It will be heated and regenerated by pressurized air. Pressure air flowing out from the outlet 18 of the adsorption column 15 during heating and regeneration flows to the drain separator 19 via the second switching valve 20 . The pressurized air introduced into the separator 19 is first cooled by a cooler 21 and drained by a cyclone 22. The pressure air passing through the cyclone 22 is transferred through the second switching valve 20 to the adsorption cylinder 16 which has already been heated and regenerated. The pressure air transferred to the adsorption cylinder 16 absorbs moisture, flows through the first switching valve 17 to the dry pressure air transfer path 23, and is transferred to a load device outside the system.

While supplying such dry pressurized air to the outside of the system, if the demand for it disappears and the discharge pressure of the compressor 1 rises to a value exceeding the set value of the pressure switch as the supply air pressure detector 25, the The power supply from the pressure switch that was supplying constant current to the integral controller 26 is stopped. At the same time, the suction valve 1 of the compressor 1
01 and the discharge valve 102 are closed to reduce the discharge of pressurized air to approximately zero to adjust the capacity.

In this way, the integral controller 26 integrates only the time during which the pressure from the compressor 1 is being supplied to the outside of the system.

Under no load as described above, heating regeneration is not performed in the adsorption column 15 in the regeneration process, and
The adsorption cylinder 16 in the moisture absorption process is not even adsorbing moisture in the pressurized air. Therefore, the time integration by the integral controller 26 as described above is truly accurate to the adsorption cylinders 15, 16.
The switching valves 17 and 2 are controlled by the integral controller 26 when the integral value reaches a predetermined set value.
0 switching can be done simultaneously and optimally.

In this way, the first switching valve 17 and the second switching valve 2
0 and 0 at the same time, the adsorption cylinder 15 in the moisture absorption process and the adsorption cylinder 16 which has been heated and regenerated can be automatically replaced within a closed loop. A switching control signal is generated from the integral controller 26, and the switching valves 17 and 20 are switched, so that the adsorption cylinder 16, which has been in the moisture absorption process, is now converted to high-temperature pressure gas having a large amount of compression heat from the compressor 1. The adsorption cylinder 15, which had been in the regeneration process before switching, will now become the adsorption cylinder in the regeneration process that receives the
This serves as an adsorption column for the moisture absorption process that receives pressurized air from the drain separator 19. In addition, in the present invention, the pressure inside the receiver 12 is detected, and therefore the compressor 1
It is possible to easily and reliably detect that the device is under load, and to obtain highly reliable integral values.

In summary, the present invention exhibits the following excellent effects.

(1) The heating regeneration of the adsorption column can be achieved using the heat held in the discharge pressure of the compressor, which is extremely advantageous in terms of energy saving.

(2) The adsorption tube can automatically switch from the moisture absorption process to the regeneration process based on the integral value of the compressor load time, providing excellent operability.

(3) Capacity can be adjusted within the set range using the air supply pressure detector.

Since the pressure inside the receiver is detected, a stable signal is obtained, it is possible to reliably and easily detect that the compressor is under load, and the reliability of the integral value is high.

[Brief explanation of drawings]

Figure 1 is a system diagram showing an example of a conventional dryer device.
FIG. 2 is a system diagram showing one embodiment of the present invention. In the figure, 1 is a compressor, 15 and 16 are adsorption cylinders, and 17
20 is a first switching valve, 20 is a second switching valve, 19 is a drain separator, 23 is a dry pressure air transfer path, 25 is a supply air pressure detector, and 26 is an integral controller.

Claims (1)

[Claims] 1 a receiver installed in the discharge pipe of the compressor;
There are at least two adsorption cylinders installed in parallel on the downstream side of the receiver, and a second adsorption cylinder that introduces high-temperature pressure air from the compressor to heat and regenerate the adsorption cylinders that have reached moisture absorption saturation among these adsorption cylinders. a drain separator that is connected to the adsorption column during heating and regeneration and removes condensate while cooling the pressure air that has passed through the separator; a second switching valve for transferring the dry pressurized air to the heat-regenerated adsorption cylinder; a dry pressure air transfer path that is connected to the heat-regenerated adsorption cylinder and transfers the dry pressure air to the outside of the system; and a predetermined pressure is applied in the receiver. and an integral controller that integrates the load time of the compressor when the load is on, and switches between the first switching valve and the second switching valve when the integrated value reaches a set value. Compressor dryer equipment.