JPS6129988Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compressed air booster used in a pneumatic drive system.

In general, pneumatic drive systems use compressed air supplied from a factory air source after being reduced to a pressure suitable for each pneumatic device, and the pressure only flows in one direction, from the factory air source to the end. It has a gender gradient. Therefore, high pressure cannot be obtained at the end of the factory line air where a large pressure drop is expected, and in order to obtain the desired high pressure at that end, the pressure of the compressed air supplied from the factory air source must be adjusted above the above level in advance. There is no choice but to set the pressure high enough to allow for pressure drop. However, if the supply pressure from the factory air source is to be sufficiently high, the air must be compressed by an electric motor using a large amount of power at a high compression ratio, which significantly increases the unit price of air. There is a drawback. Furthermore, if the supply pressure from the factory air source is high, if the pressure at the end of use is not properly controlled, the compressed air will be wasted and consumed at a pressure higher than that required by each pneumatic device. In addition, there is also the drawback that economic efficiency is significantly reduced due to leakage.

On the other hand, a pressure increasing mechanism has been known that outputs fluid pressure acting on a large diameter piston as high fluid pressure using a plunger integrated with the large diameter piston. However, these are used for the special purpose of generating ultra-high pressure with little consideration for energy efficiency, and are not compatible with general industrial air drive systems of 10Kg/cm ² or less. However, it is not possible to efficiently increase the line pressure and discharge continuously.

In view of the above, the present invention aims to provide a pressure booster that can efficiently boost and continuously discharge compressed air using the compressed air itself as a power source, and that can be easily applied to general industrial pneumatic drive systems. It is something to do.

In order to achieve such an object, the pressure boosting device of the present invention has a drive piston and a pressure boosting piston that are tightly fitted inside a drive cylinder and a pressure boosting cylinder that are connected to each other via a partition wall so as to be able to slide in the axial direction, respectively. The inside of the drive cylinder and the pressure boosting cylinder are each divided into two drive chambers and two pressure boosting chambers, and between both drive chambers and the inlet port, one of the drive chambers is switched to the inlet port and the other to the atmosphere. A switching valve is connected, and each of the pressurization chambers is communicated with the inlet port via an inlet valve that only allows air to flow in, and each is communicated with the outlet port via an outlet valve that only allows air to flow out, A detector that connects the driving piston and the boosting piston by a rod that slidably penetrates the partition body in a tightly fitted state, and outputs a switching signal to the switching valve when the driving piston or the boosting piston reaches the stroke end. It is constructed by providing

In a pressure booster having such a configuration, the compressed air from the factory air source supplied to the inlet port is pressurized using its own pressure and discharged from the outlet port. When the chamber is communicated with the inlet port and the other drive chamber is communicated with the atmosphere, the booster piston is driven by the accompanying thrust acting on the drive piston, and the compressed air in one booster chamber is discharged under increased pressure,
When the drive piston and booster piston are driven in opposite directions by switching the switching valve at the end of the stroke, the high pressure air in the other booster chamber is discharged under increased pressure, and by repeating this operation, compressed air at the required pressure is released from the outlet port. This is what is output.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In FIG. 1 showing the entire pneumatic drive system in a factory, 1 is a factory air source;
is an air purifier, 3 is an airline, and compressed air from the factory air source 1 (pressure P _M = 3 to 5 kg) is used.
/cm ² ) is sent to the airline 3 via the air purifier 2, and at the end of use where high pressure is required, it is appropriately increased in pressure by the booster 4 (pressure P _H = 5~ 9 Kg/cm ² ), then supplied to the load system 6 via the pressure accumulating container 5. Above load system 6
The air pressure supplied to _the
Kg/cm ² ), as _shown in FIG.
Kg/cm ² ) is recovered by a low-pressure air recovery device 7,
After storing it in the container 5, it can be pressurized by the pressure booster 4 and refluxed to the line.

As shown in FIG. 2, the pressure booster 4 includes an inlet port 11, an outlet port 12, and a _cylinder 13 disposed between them. The pressure of the high-pressure air P _H is raised to twice that of the high-pressure air P H and continuously discharged from the outlet port 12, so that the high-pressure air can be supplied to the load system 6 via the container 5.

The cylinder 13 is constructed by integrally connecting a drive cylinder 14 and a boost cylinder 15 with a partition wall 16 interposed therebetween.
is a drive piston 1 that is tightly fitted so as to be slidable in the axial direction.
7, there are two drive chambers 14a and 14b inside.
Supply/discharge passages 19 and 20 connected to these drive chambers 14a and 14b are connected to the inlet port 11 via a drive valve 21 and an inlet pipe 22. The driven valve 21 is composed of a pressure regulating valve 23, a pressure gauge 24, and a switching valve 25.
3 makes it possible to reduce the pressure of the line air, and the switching valve 25 supplies the air from the pressure regulating valve 23 to one of the drive chambers 14a, 14b, and connects the other drive chamber to the atmosphere. The communication state of 14a and 14b is configured to be switchable. The switching of the switching valve 25 is automatically performed using any force such as electromagnetic force or pilot fluid pressure based on a switching signal from a detector which will be described later. The inside of the boost cylinder 15 is partitioned into two boost chambers 15a and 15b by a boost piston 27 which is slidably and tightly fitted in the axial direction. Inlet channel 28,2 with 29a
9 and an inlet pipe 22 to the inlet port 11 . The inlet valves 28a, 29a are configured as check valves that allow line air to flow from the inlet pipe 22 into the pressurizing chambers 15a, 15b, and prevent the reverse flow. Further, each of the pressurizing chambers 15a and 15b has an outlet valve 30.
Outlet channels 30, 31 with a, 31a are provided, which are connected to the outlet port 12 via an outlet pipe 32. The outlet valves 30a and 31a are check valves that allow the pressurized air in the pressurized chambers 15a and 15b to flow out to the outlet port 12, and prevent backflow thereof. Further, the pair of pistons 17 and 27 are integrally connected at their opposing surfaces by a rod 34, and the rod 34 is slidably penetrated through the partition wall 16 in a tightly fitted state, so that the pair of pistons 17 and 27 are integrally connected. It is designed to be displaced back and forth. Further, a detector 35 is provided on at least one of the drive cylinder 14 and the boost cylinder 15, for electrically or mechanically detecting whether the pistons 17, 27 have reached the upper or lower stroke end.
36, and the detector is configured to output a switching signal for automatically switching the switching valve 25. In addition, in the figure, 37 is a pressure gauge connected to the outlet pipe 32.

Next, the operation of the booster having the above configuration will be explained.

FIG. 2 shows the state immediately after the air is compressed and discharged in the pressurization chamber 15b. In this state, the detector 35 detects the arrival of the drive piston 17 at the stroke end, and based on this, the detector 35 detects that the drive piston 17 has reached the stroke end.
The switching signal output by the switching valve 25 switches the switching valve 25 from the illustrated position to another position. This results in
The line air supplied to the inlet port 11 is connected to the inlet pipe 22, the pressure regulating valve 23, the switching valve 25, and the supply/discharge path 1.
The line air stored in the drive chamber 14b in the previous stroke is discharged to the atmosphere via the supply/discharge passage 20 and the switching valve 25. In addition, line air is constantly supplied to the pressurizing chambers 15a, 15b via the inlet valves 29a, 28a, and the pressurizing piston 27 is in a pressure-balanced state. As a result, the drive is driven by the line air supplied to the drive chamber 14a and the booster chamber 15b.
The downward thrust applied to the boosting pistons 17, 27 overcomes the upward thrust applied to the boosting piston 27 by the line air supplied to the boosting chamber 15b, and the pair of pistons 17, 27 and the rod 34
is moved downward to increase the pressure of the compressed air in the pressurizing chamber 15a, and the outlet passage 31 equipped with the outlet valve 31a is
through the outlet port 12 into the container 5. The boost ratio in this case is the boost piston 2
Pressure receiving area a, b on both sides of 7 (a:b=1:
0.9), the pressure receiving areas on both sides of the drive piston 17 are c and d, and the pair of pistons 27 and 17 have the same diameter, that is, a=d, b=c, and the pressure reduction ratio in the pressure regulating valve 23 is 1 (pressure reduction (without), P _H /P _M =d+b/a=1.9, and the line air can be boosted to about twice the pressure and output. Note that in order to lower the pressure increase ratio, line air may be depressurized by the pressure regulating valve 23 and then added to the drive chamber 14a.

When the pair of pistons 17, 27 and the rod 34 reach their downward stroke ends, the detector 36 detects this and outputs a switching signal, which causes the switching valve 25 to switch to the position shown. As a result, the line air stored in the drive chamber 14a during the previous stroke is released to the atmosphere via the switching valve 25,
The drive chamber 14b includes an inlet pipe 22, a pressure regulating valve 23,
Line air is supplied through the switching valve 25 and the supply/discharge path 20. As a result, contrary to the case described above, the pressurizing pistons 17 and 2 are driven by the line air supplied to the driving chamber 14b and the pressurizing chamber 15a.
The upward thrust applied to the booster piston 27 overcomes the downward thrust applied to the booster piston 27 by the line air supplied to the booster chamber 15b, and the pair of pistons 1
7, 27 and the rod 34 upward to increase the pressure of the air in the pressurization chamber 15b and close the outlet valve 30a.
from the outlet port 12 to the container 5 through an outlet passage 30 with a 100 mm diameter, and returns to the position shown in FIG. The pressure increase ratio in this case is P′ _H /P _M =c+a/b≈2.1, and this pressure increase ratio can also be lowered by the pressure regulating valve 23 in the same manner as described above.

Therefore, the pressure increase ratio by the pressure booster 4 is approximately double, so it is applied to a general industrial pneumatic system with a factory air source pressure of 4 to 5 kg/ ^cm2 , and the pressure is subject to the regulations of the High Pressure Gas Control Law. It is suitable for increasing the pressure to 10 Kg/cm ² or less, and there is no need for cooling because the temperature increase due to compression is small. Further, in order to approximately double the pressure increase ratio, the drive piston 17 and the pressure increase piston 27 can be made to have the same diameter, and the cylinder 13 can have a simple structure.

FIGS. 3 and 4 show specific structural examples of the booster 4. FIG. That is, the booster 4
The driving and boosting cylinders 14 and 15 each having a piston inserted therein are sandwiched between a drive chamber cover 41 and a boosting chamber cover 42 with a partition 16 sandwiched between them, and are held together by a tie rod 43. It is a fixed configuration. Then,
The inlet port 11 formed in the pressurization chamber cover 42 is
The inlet passage 28 provided with the inlet valve 28a communicates with the pressurizing chamber 15a and the inlet pipe 22, and the inlet pipe 22 communicates with the drive valve 21 directly connected to the partition body 16. It communicates with the pressurizing chamber 15b via an inlet passage 29 provided with an inlet valve 29a. Furthermore, the drive valve 2
1 is connected to the drive chamber 1 through supply/discharge passages 19 and 20, respectively.
4a, 14b, and the outlet port 12 formed in the pressurization chamber cover 42 is connected to the outlet valve 31a.
The outlet port 12 is connected to the pressurizing chamber 15a through an outlet passage 31 having an outlet pipe 32 and an outlet valve 30a.
It is connected to 5b.

According to the booster of the present invention, the following features can be obtained.

(1) By simply supplying compressed air from the factory air source to the inlet port, the compressed air can be pressurized and sent out from the outlet port, so it can be easily applied to pneumatic drive systems in the same way as conventional pressure reducing valves. As a result, the air pressure at the end of the airline can be appropriately increased, thereby eliminating the conventional one-way pressure gradient restriction that only reduces the air pressure.

(2) Since compressed air from the factory air source can be pressurized, a low-pressure, large-capacity factory air source with a low unit price can be used, which prevents management errors and air leaks at the terminals of airlines. It is also possible to significantly reduce damage and achieve energy savings.

(3) Since the compressed air supplied to the inlet port itself is used as power, and the compressed air is pressurized and discharged from the outlet port, there is no need to supply new energy to increase the pressure.

(4) The discharge start, discharge speed and discharge stop of pressurized compressed air from the outlet port are performed automatically following the pressure state of the load connected to the outlet port, that is, the pressure at the load is lower than the set pressure. If the pressure drops, discharge from the outlet port will start, and the discharge speed will be faster as the load pressure is lower than the set pressure, and when the load reaches the set pressure, discharge from the outlet port will stop. , no special control device for controlling the discharge, such as an unloader or a pressure switch device in the compressor, is required.

(5) Since the boost piston is pressure-balanced, most of the compressed air added to the drive piston that is integrated with it can be efficiently used to boost the output pressure, which also makes it possible to achieve energy savings.

[Brief explanation of the drawing]

Fig. 1 is an overall block diagram of a factory pneumatic drive system to which the present invention is applied, Fig. 2 is a block diagram of an embodiment of the present invention, and Figs. 3 and 4 are a front view and a side view of an example of the structure. . 4... Boosting device, 11... Inlet port, 12...
...Outlet port, 14...Drive cylinder, 14a,
14b... Drive chamber, 15... Boost cylinder, 15
a, 15b... pressurization chamber, 16... partition body, 17...
... Drive piston, 25 ... Switching valve, 27 ... Boost piston, 28a, 29a ... Inlet valve, 30a,
31a... Outlet valve, 34... Rod, 35, 36
……Detector.

Claims (1)

[Scope of utility model registration request] A drive piston and a booster piston are tightly fitted into a drive cylinder and a booster cylinder that are connected to each other via a partition wall so as to be able to slide in the axial direction. A switching valve is connected between both driving chambers and the inlet port to switch one of the driving chambers into communication with the inlet port and the other with the other. The drive piston and the booster piston are connected to the inlet port through an inlet valve that only allows air to flow in, and to the outlet port through an outlet valve that allows only air to flow out, and the driving piston and booster piston are tightly fitted with the partition body. A booster device, characterized in that it is connected by a rod slidably penetrated by a detector, which outputs a switching signal to the switching valve when the driving piston or the boosting piston reaches a stroke end.