JP2022142040A - factory air system - Google Patents

Abstract

To increase a flow volume of air supplied to a load, in a factory air system.SOLUTION: A factory air system 100 comprises: a first cylinder 110; a second cylinder 120; a first piston 131 housed in the first cylinder, and defining the inside of the first cylinder into a first chamber 111 and a second chamber 112 into which outside air can flow via a first check valve 181; a second piston 132 housed in the second cylinder, and defining the inside of the second cylinder into a third chamber 123 and a fourth chamber 124 into which outside air can flow via a second check valve 182; a piston rod 150 which is inserted into through-holes formed in the second chamber and the fourth chamber, and has the first piston at one end portion, and the second piston at the other end portion; and a switching valve 170. When making an air supply source 105 and the first chamber communicate with each other, the switching valve decompresses air in the third chamber by exhausting the air into the second chamber.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to factory air systems.

Regarding a factory air system, Patent Literature 1 discloses a pressure increasing device for increasing the pressure of a fluid. In this pressure booster, pistons arranged in the first drive chamber, the pressure booster chamber, and the second drive chamber are connected by one piston rod. Each drive chamber is divided into an inner pressure chamber and an outer pressure chamber by an internal piston. In this pressure intensifying device, the exhaust gas from the inner pressurizing chamber is supplied to the outer pressurizing chamber through the return passage, thereby displacing the piston in the drive chamber toward the pressurizing chamber and increasing the pressure in the pressurizing chamber.

JP 2018-84270 A

In the above document, it is possible to increase the pressure of the air. In contrast, factory air systems may have an air pressure reduction. In a factory air system that reduces the pressure of air, there is a demand for a technique capable of increasing the flow rate of air supplied to a load in order to improve the efficiency of air supply.

The present disclosure can be implemented as the following forms.

(1) According to a first aspect of the present disclosure, there is provided a factory air system that decompresses compressed air supplied from an air supply source and supplies it to a load. This factory air system is housed in a first cylinder, a second cylinder, and said first cylinder, and outside air flows into said first cylinder via a first chamber and a first check valve. a first piston that partitions into a possible second chamber; a first piston that is housed in the second cylinder; the interior of the second cylinder is allowed to flow into a third chamber; and external air can flow through the second check valve. and a second piston partitioning into a fourth chamber, and through holes respectively provided in the second chamber and the fourth chamber, and the first piston is provided at one end and the other end an air outlet communicating with the second chamber and the fourth chamber and supplying air supplied from the second chamber or the fourth chamber to the load; and the air supply source, the first chamber, the second chamber, the third chamber and the fourth chamber, and the air supply source, the first chamber, the second chamber and the third chamber are connected to each other. and a switching valve capable of switching the communication state of the fourth chamber, wherein the switching valve switches between the second chamber and the fourth chamber when communicating the air supply source and the first chamber. By communicating with the three chambers, the air in the third chamber is exhausted into the second chamber to be decompressed and sent from the second chamber to the air outlet together with the air in the second chamber.
With such a configuration, when compressed air is supplied to the first chamber, the air in the third chamber is discharged into the second chamber by communicating the second chamber with the third chamber. Since the compressed air is supplied to the air outlet together with the air of the compressed air, the flow rate of the decompressed air supplied to the load can be increased.
(2) In the above aspect, when the air supply source and the third chamber are communicated, the switching valve communicates the first chamber with the fourth chamber, thereby controlling the air in the first chamber. may be exhausted into the fourth chamber to reduce the pressure and supply the air from the fourth chamber to the air outlet together with the air in the fourth chamber. With such a configuration, when compressed air is supplied to the third chamber, the air in the first chamber is discharged into the fourth chamber by communicating the first chamber and the fourth chamber. Since the compressed air is supplied to the air outlet together with the air of the compressed air, the flow rate of the decompressed air supplied to the load can be further increased.
(3) In the above aspect, the switching valve and the first chamber generate a controlled flow from the switching valve toward the first chamber and generate a free flow from the first chamber toward the switching valve. It may be connected through a first speed control valve. With such a configuration, the first piston can be stably moved when the air supply source and the first chamber are communicated with each other. Further, when the first chamber and the fourth chamber are communicated with each other, the air can be smoothly exhausted from the first chamber to the fourth chamber.
(4) In the above aspect, the switching valve and the third chamber generate a controlled flow from the switching valve toward the third chamber and generate a free flow from the third chamber toward the switching valve. It may be connected through a second speed control valve. With such a configuration, the second piston can be stably moved when the air supply source and the third chamber are communicated with each other. Further, when the second chamber and the third chamber are communicated with each other, the air can be smoothly exhausted from the third chamber to the second chamber.
(5) The above aspect may include a mechanical valve that detects the position of the piston rod, and the switching valve may switch the communication state according to pilot air output from the mechanical valve. With such a form, the factory air system can be operated by air pressure without using electricity.
The present disclosure can be implemented in various forms other than the above-described factory air system, such as a decompression device and a decompression method.

It is an explanatory view showing a schematic structure of a factory air system. It is an explanatory view showing a schematic structure of a factory air system. It is an explanatory view showing a schematic structure of a factory air system. It is an explanatory view showing the 1st example of application of a factory air system. FIG. 11 is an explanatory diagram showing a second application example of the factory air system;

A. First embodiment:
1 to 3 are explanatory diagrams showing a schematic configuration of a factory air system 100 as an embodiment of the present disclosure. The following mainly refers to FIG. The factory air system 100 is a system that reduces the pressure of compressed air supplied from an air supply source 105 such as a compressor and supplies it to a load. Factory air system 100 may also be referred to as a pressure reducing device. The factory air system 100 comprises a first cylinder 110 , a second cylinder 120 , a first piston 131 , a second piston 132 , a piston rod 150 , an air outlet 160 and a switching valve 170 .

First cylinder 110 is a hollow tubular member having first top surface 118 and first bottom surface 119 . The second cylinder 120 is a hollow tubular member having a second top surface 128 and a second bottom surface 129 . A first piston 131 is housed in the first cylinder 110 and a second piston 132 is housed in the second cylinder 120 . First cylinder 110 and second cylinder 120 are arranged such that first bottom surface 119 of first cylinder 110 and second bottom surface 129 of second cylinder 120 face each other.

A first piston 131 housed in the first cylinder 110 partitions the inside of the first cylinder 110 into a first chamber 111 and a second chamber 112 . Outside air, that is, the atmosphere, can flow into the second chamber 112 via the first check valve 181 . The first check valve 181 is configured to allow air to flow into the second chamber 112 from the outside and to restrain air from flowing out of the second chamber 112 to the outside.

A second piston 132 housed in the second cylinder 120 partitions the inside of the second cylinder 120 into a third chamber 123 and a fourth chamber 124 . Outside air, that is, the atmosphere, can flow into the fourth chamber 124 via the second check valve 182 . The second check valve 182 is configured to allow air to flow into the fourth chamber 124 from the outside and to prevent air from flowing out of the fourth chamber 124 to the outside.

The piston rod 150 is inserted through through holes provided in the second chamber 112 of the first cylinder 110 and the fourth chamber 124 of the second cylinder 120, respectively. More specifically, the piston rod 150 has a through hole provided in the center of the first bottom surface 119 forming part of the second chamber 112 of the first cylinder 110 and a third chamber 123 of the second cylinder 120. It is inserted through a through hole provided in the center of the second bottom surface 129 forming a part thereof. A first piston 131 is provided at one end of the piston rod 150 and a second piston 132 is provided at the other end. A portion of the piston rod 150 located between the first cylinder 110 and the second cylinder 120 is provided with an enlarged diameter portion 151 having a larger diameter than the other portions.

A mechanical valve for detecting the position of piston rod 150 is arranged between first cylinder 110 and second cylinder 120 . In this embodiment, the first mechanical valve 101 and the second mechanical valve 102 are arranged to individually detect the positions of the first piston 131 and the second piston 132 connected to the piston rod 150 . The first mechanical valve 101 is arranged between the first cylinder 110 and the second mechanical valve 102 , and the second mechanical valve 102 is arranged between the first mechanical valve 101 and the second cylinder 120 . A mechanical valve can also be called a limit valve.

In this embodiment, when the first piston 131 comes closest to the first top surface 118 of the first cylinder 110 and the second piston 132 comes closest to the second bottom surface 129 of the second cylinder 120, that is, the first When the volume of the chamber 111 and the volume of the fourth chamber 124 are the smallest, the enlarged diameter portion 151 of the piston rod 150 contacts the first mechanical valve 101 . When the expanded diameter portion 151 contacts the first mechanical valve 101, the first mechanical valve 101 outputs compressed air as pilot air to a switching valve 170 described later through a flow path (not shown). The pilot air output from the first mechanical valve 101 is hereinafter also referred to as first pilot air. Compressed air used for the first pilot air is supplied from an air supply source 105 .

Further, in this embodiment, when the first piston 131 comes closest to the first bottom surface 119 of the first cylinder 110 and the second piston 132 comes closest to the second top surface 128 of the second cylinder 120, that is, When the volume of the second chamber 112 and the volume of the third chamber 123 are the smallest, the enlarged diameter portion 151 of the piston rod 150 contacts the second mechanical valve 102 . When the expanded diameter portion 151 contacts the second mechanical valve 102, the second mechanical valve 102 outputs compressed air as pilot air to a switching valve 170 described later through a flow path (not shown). The pilot air output from the second mechanical valve 102 is hereinafter also referred to as second pilot air. Compressed air used for the second pilot air is supplied from an air supply source 105 .

Air outlet 160 communicates with second chamber 112 of first cylinder 110 and fourth chamber 124 of second cylinder 120 . The air outlet 160 supplies air supplied from the second chamber 112 or the fourth chamber 124 to the load. The air outlet 160 is connected to a junction of a first outlet channel 161 communicating with the second chamber 112 and a second outlet channel 162 communicating with the fourth chamber 124 . A third check valve 183 is arranged in the first outlet channel 161 , and a fourth check valve 184 is arranged in the second outlet channel 162 . The third check valve 183 allows air to flow out from the second chamber 112 to the air outlet 160 and suppresses air from flowing into the second chamber 112 from the air outlet 160 and the fourth chamber 124 . The fourth check valve 184 allows air to flow out from the fourth chamber 124 to the air outlet 160 and prevents air from flowing into the fourth chamber 124 from the air outlet 160 and the second chamber 112 . The above-described first check valve 181 communicates with the second chamber 112 via the first outlet channel 161 in this embodiment. Also, the above-described second check valve 182 communicates with the fourth chamber 124 via the second outlet channel 162 . However, the first check valve 181 may be directly connected to the second chamber 112 without passing through the first outlet channel 161, and the second check valve 182 may be connected to the second outlet channel 162. It may be directly connected to the fourth chamber 124 without going through.

Air supply source 105 , first chamber 111 , second chamber 112 , third chamber 123 and fourth chamber 124 are connected to switching valve 170 . Specifically, the first chamber 111 and the switching valve 170 are connected by a first flow path 171 . Second chamber 112 and switching valve 170 are connected by a second flow path 172 . Third chamber 123 and switching valve 170 are connected by a third flow path 173 . The fourth chamber 124 and switching valve 170 are connected by a fourth flow path 174 .

The switching valve 170 switches the communication state of the air supply source 105, the first chamber 111, the second chamber 112, the third chamber 123, and the fourth chamber 124 according to the pilot air output from the mechanical valves 101 and 102. . The switching valve 170 of this embodiment is configured as a directional switching valve having a spool inside. More specifically, in this embodiment, the switching valve 170 is composed of a double-type air operated valve that has five ports and can switch the position of the spool between two positions.

A first speed control valve 191 is provided in the first flow path 171 . That is, the switching valve 170 and the first chamber 111 are connected via the first speed control valve 191 . The first speed control valve 191 has a structure in which a check valve and a throttle valve are connected in parallel. The first speed control valve 191 generates a controlled flow from the switching valve 170 toward the first chamber 111 and generates a free flow from the first chamber 111 toward the switching valve 170 by means of the check valve and throttle valve. It is configured to allow

A second speed control valve 192 is provided in the third flow path 173 . That is, the switching valve 170 and the third chamber 123 are connected via the second speed control valve 192 . The second speed control valve 192 has a configuration in which a check valve and a throttle valve are connected in parallel. The second speed control valve 192 generates a controlled flow from the switching valve 170 toward the third chamber 123 and generates a free flow from the third chamber 123 toward the switching valve 170 by means of the check valve and throttle valve. It is configured to allow

The throttle opening of the throttle valves included in the first speed control valve 191 and the second speed control valve 192 is set through simulations and experiments so that the factory air system 100 can smoothly decompress. Note that the speed control valve is also called a speed controller.

FIG. 1 shows a state in which the switching valve 170 is displaced to the first position. In the first position, the switching valve 170 connects the air supply source 105 and the fourth chamber 124 through the third flow path 173, and connects the first chamber 111 and the fourth chamber 124 with the first flow path 171 and the fourth flow path. Communicate through passage 174 . In the first position, the switching valve 170 opens the second flow path 172 so that the second chamber 112 does not communicate with the air supply source 105, the first chamber 111, the third chamber 123, and the fourth chamber 124. Cut off.

FIG. 2 shows a state in which the switching valve 170 is displaced to the second position. In the second position, the switching valve 170 connects the air supply source 105 and the first chamber 111 through the first flow path 171, and connects the second chamber 112 and the third chamber 123 with the second flow path 172 and the third flow path. Communicate with the passage 173 . In the second position, the switching valve 170 closes the fourth flow path 174 so that the fourth chamber 124 does not communicate with the air supply source 105, the first chamber 111, the second chamber 112, and the third chamber 123. Cut off.

In this embodiment, the switching valve 170 is displaced from the first position to the second position when the first pilot air is supplied from the first mechanical valve 101 . Further, the switching valve 170 is displaced from the second position to the first position when the second pilot air is supplied from the second mechanical valve 102 . By alternately displacing the switching valve 170 between the first position and the second position in this manner, the pressure of the compressed air is continuously reduced in the factory air system 100 .

The operation of factory air system 100 will now be described with reference to FIGS. 1-3. In FIG. 1, with the switching valve 170 displaced to the first position, the first piston 131 in the first cylinder 110 reaches the end on the first upper surface 118 side, and the second piston 131 in the second cylinder 120 A state in which the piston 132 has reached the end on the second bottom surface 129 side is shown. Hereinafter, for convenience of explanation, the direction from the first bottom surface 119 to the first top surface 118 of the first cylinder 110 is called the "L direction", and the opposite direction is called the "R direction". The L direction and the R direction are directions in which the first piston 131 and the second piston 132 move, and are directions along the axial direction of the piston rod 150 .

In the state shown in FIG. 1 , the third chamber 123 of the second cylinder 120 is filled with compressed air supplied from the air supply source 105 through the switching valve 170 and the third flow path 173 . The second chamber 112 of the first cylinder 110 is filled with air sucked from the outside through the first check valve 181 .

As shown in FIG. 1, when the first piston 131 and the second piston 132 reach the ends in the L direction, the first mechanical valve 101 contacts the enlarged diameter portion 151 of the piston rod 150, and the first mechanical valve 101 The first pilot air is output to switching valve 170 . Switching valve 170 is displaced from the first position shown in FIG. 1 to the second position shown in FIG. 2 by the input of the first pilot air.

In FIG. 2, by displacing the switching valve 170 to the second position, the first piston 131 in the first cylinder 110 moves in the R direction, and the second piston 132 in the second cylinder 120 moves in the R direction. It shows the state of moving to

When the switching valve 170 is switched from the first position to the second position shown in FIG. 111. Then, the first piston 131 moves in the R direction due to the thrust corresponding to the difference between the front and back pressure receiving areas of the first piston 131 . and through the third check valve 183 to the air outlet 160 . Further, when the first piston 131 moves in the R direction, the second piston 132 is also pushed by the piston rod 150 and moves in the R direction within the second cylinder 120 accordingly. Then, external air is sucked into the fourth chamber 124 of the second cylinder 120 through the second check valve 182, and the compressed air accumulated in the third chamber 123 is released into the third flow path 173 and the second flow path. Air is supplied to the second chamber 112 through 172 while being decompressed. The air supplied to the second chamber 112 is supplied to the air outlet 160 through the first outlet passage 161 and the third check valve 183 together with the air accumulated in the second chamber 112, and is supplied to the load as decompressed air. supplied.

FIG. 3 shows a state in which the first piston 131 and the second piston 132 have reached the ends in the R direction. In this state, the air in the second chamber 112 and the compressed air in the third chamber 123 are all sent to the air outlet 160 and supplied to the load. The first chamber 111 is filled with compressed air supplied from the air supply source 105, and the fourth chamber 124 is filled with air sucked from the outside.

As shown in FIG. 3, when the first piston 131 and the second piston 132 reach the ends in the R direction, the second mechanical valve 102 contacts the enlarged diameter portion 151 of the piston rod 150, and the second mechanical valve 102 The second pilot air is output to switching valve 170 . Switching valve 170 is displaced from the second position shown in FIG. 3 to the first position shown in FIG. 1 by the input of the second pilot air. Then, compressed air is supplied to the third chamber 123, and the second piston 132 moves in the L direction by a thrust corresponding to the difference between the front and back pressure receiving areas of the second piston 132. Accordingly, the first piston 131 is also L. move in the direction As a result, external air is sucked into the second chamber 112 of the first cylinder 110 through the first check valve 181. Air is supplied to the fourth chamber 124 through 174 while being decompressed. The air supplied to the fourth chamber 124 is supplied to the air outlet 160 through the second outlet passage 162 and the fourth check valve 184 together with the air accumulated in the fourth chamber 124, and is supplied to the load as decompressed air. supplied.

In this embodiment, the operation described above is repeatedly performed to supply decompressed air from the factory air system 100 to the load.

According to the factory air system 100 of this embodiment described above, when supplying compressed air to the first chamber 111 of the first cylinder 110 to move the first piston 131 and the second piston 132 in the R direction, By connecting the second chamber 112 and the third chamber 123, the air existing in the third chamber 123 is exhausted to the second chamber 112 of the first cylinder 110 without being discharged to the outside. It is supplied to the load from the second chamber 112 together with the air already accumulated in the second chamber 112 . Therefore, the flow rate of the decompressed air supplied to the load can be increased. Further, in the present embodiment, when compressed air is supplied to the third chamber 123 of the second cylinder 120 to move the second piston 132 and the first piston 131 in the L direction, the first chamber 111 and the fourth chamber 124 , the air existing in the first chamber 111 of the first cylinder 110 is exhausted to the fourth chamber 124 of the second cylinder 120 without being discharged to the outside. The air is supplied from the fourth chamber 124 to the load together with the air. Therefore, it is possible to further increase the flow rate of the decompressed air supplied to the load. Thus, in this embodiment, the flow rate of the decompressed air can be increased in both the R-direction and L-direction actions of the first piston 131 and the second piston 132 .

Furthermore, in this embodiment, since the switching valve 170 and the first chamber 111 of the first cylinder 110 are connected via the first speed control valve 191, the air supply source 105 and the first chamber 111 are communicated. When the compressed air is supplied from the air supply 105 to the first chamber 111, a controlled flow of the compressed air can be produced. Therefore, the first piston 131 can be stably moved. Further, when the first chamber 111 and the fourth chamber 124 are communicated with each other and the compressed air is exhausted from the first chamber 111 to the fourth chamber 124, a free flow of the compressed air can be generated. Air can be smoothly exhausted from the chamber 111 to the fourth chamber 124 . Further, in this embodiment, since the switching valve 170 and the third chamber 123 of the second cylinder 120 are connected via the second speed control valve 192, the air supply source 105 and the third chamber 123 are communicated. When the compressed air is supplied from the air supply 105 to the third chamber 123, a controlled flow of the compressed air can be produced. Therefore, the second piston 132 can be stably moved. Further, when the second chamber 112 and the third chamber 123 are communicated with each other and the compressed air is exhausted from the third chamber 123 to the second chamber 112, a free flow of the compressed air can be generated. Air can be smoothly exhausted from the chamber 123 to the second chamber 112 . Thus, in this embodiment, by providing the factory air system 100 with the first speed control valve 191 and the second speed control valve 192, the factory air system 100 can be made to perform a stable decompression operation.

Further, in this embodiment, the switching valve 170 switches the communication state of each flow path by the pilot air output from the mechanical valves 101 and 102, so the factory air system 100 is operated only by compressed air without using electricity. can be made Therefore, the energy saving performance of the factory air system 100 can be improved.

In this embodiment, the cylinder to which compressed air is supplied can be called a driving cylinder. Also, a cylinder that supplies decompressed air to a load can be called a pump cylinder. In the present embodiment, the switching valve 170 is repeatedly displaced between the first position and the second position, so that the first cylinder 110 and the second cylinder 120 are alternately used as a drive cylinder and a pump cylinder, respectively. Operate.

B. Application example:
FIG. 4 is an explanatory diagram showing a first application example of the factory air system 100 described above. In the first application example shown in FIG. On the other hand, a machining line 20 having NC devices and the like is connected in parallel. Each machining line 20 is equipped with a pressure reducing valve 30 for reducing the pressure of compressed air from 400 kPa to 300 kPa. This 300 kPa decompressed air is used to drive various air cylinders 40 provided in the machining line. The machining line 20 is provided with the factory air system 100 of the above-described embodiment in parallel with the pressure reducing valve 30, and the factory air system 100 reduces the pressure of compressed air from 400 kPa to about 150 kPa. This 150 kPa decompressed air is used, for example, for air blowing of oil used in an NC device and air purging of a spindle.

As noted above, the factory air system 100 can increase the flow rate of vacuum air supplied to the load. Therefore, in the first application example shown in FIG. 4, the inner diameter of the first cylinder 110 and the second cylinder 120 of the factory air system 100 is set to 300 mm, the stroke length is set to 400 mm, and the factory air system 100 is supplied with 166 Nm ³ /( h·unit) of air was supplied, and the air flow rate after decompression was able to be increased to about 200 Nm ³ /(h·unit). Therefore, it is possible to increase the air supply efficiency by at least about 17% compared to reducing the pressure using, for example, a bleed type pressure reducing valve that does not increase the air flow rate.

FIG. 5 is an explanatory diagram showing a second application example of the factory air system 100 described above. In a second application example shown in FIG. 5, a motive power compressor 10 that generates compressed air of 600 kPa is prepared in accordance with an assembly line 50 that requires a high pressure. In the assembly line 50, for example, various parts are attached to automobiles. The motive power compressor 10 is connected in parallel with the assembly line 50 to the factory air system 100 of the above embodiment. A plurality of machining lines 20 are connected in parallel to the factory air system 100 . In each machining line 20, decompressed air decompressed by the factory air system 100 is supplied to various air cylinders 40, and the air further decompressed by the decompression valve 30 is used for air blowing and air purging. In such a second application example, the air used in each machining line 20 can be collectively reduced in the factory air system 100, so each machining line 20 can be efficiently operated. can.

Each pressure value in the first application example and the second application example described above is an example, and various pressure values can be set according to factory equipment. Moreover, the factory air system 100 of the above-described embodiment can be incorporated into various factory facilities, not limited to the first application example and the second application example.

C. Other embodiments:
(C-1) In the above embodiment, an air operated valve is used as the switching valve 170, but a solenoid valve may be used. Further, in the above embodiment, the position of the piston is detected by the mechanical valve, but it may be detected by using an optical or electrical switch.

(C-2) In the above embodiment, the first speed control valve 191 is connected to the first chamber 111 of the first cylinder 110, and the second speed control valve 192 is connected to the third chamber 123 of the second cylinder 120. there is On the other hand, it is possible to adopt a configuration in which the first speed control valve 191 and the second speed control valve 192 are omitted, or a configuration in which either one of them is omitted.

(C-3) In the above embodiment, the factory air system 100 is controlled by the two mechanical valves 101 and 102 and one switching valve 170 . On the other hand, the configurations of the mechanical valve and switching valve are arbitrary, and are not limited to the configurations of the above embodiments. For example, one mechanical valve and a single spring-loaded directional control valve may be used to configure the factory air system. In addition, the factory air system may be configured so that the pressure is reduced when the piston is moved in either one direction, rather than when the piston is moved in both the L and R directions.

The present disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from the scope of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in the respective modes described in the Summary of the Invention column may be used to solve some or all of the above problems, or Substitutions and combinations may be made as appropriate to achieve part or all. Also, if the technical features are not described as essential in this specification, they can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 10... Driving force compressor 20... Machining line 30... Pressure reducing valve 50... Assembly line 100... Factory air system 101... First mechanical valve 102... Second mechanical valve 105... Air supply source 110... First cylinder 111 First chamber 112 Second chamber 118 First upper surface 119 First bottom surface 120 Second cylinder 123 Third chamber 124 Fourth chamber 128 Second chamber Upper surface 129 Second bottom surface 131 First piston 132 Second piston 150 Piston rod 151 Expanded diameter portion 160 Air outlet 161 First outlet flow path 162 Second outlet flow Path 170 Switching valve 171 First flow path 172 Second flow path 173 Third flow path 174 Fourth flow path 181 First check valve 182 Second check valve , 183... Third check valve, 184... Fourth check valve, 191... First speed control valve, 192... Second speed control valve

Claims (5)

A factory air system for depressurizing compressed air supplied from an air supply and supplying it to a load, comprising:
a first cylinder;
a second cylinder;
a first piston that is housed in the first cylinder and divides the interior of the first cylinder into a first chamber and a second chamber into which external air can flow via a first check valve;
a second piston that is housed in the second cylinder and divides the interior of the second cylinder into a third chamber and a fourth chamber into which external air can flow via a second check valve;
a piston rod inserted through through-holes respectively provided in the second chamber and the fourth chamber, having one end provided with the first piston and the other end provided with the second piston;
an air outlet that communicates with the second chamber and the fourth chamber and supplies the air supplied from the second chamber or the fourth chamber to the load;
connected to the air supply source, the first chamber, the second chamber, the third chamber, and the fourth chamber, the air supply source, the first chamber, the second chamber, the third chamber, and a switching valve capable of switching the communication state of the fourth chamber,
The switching valve discharges the air in the third chamber into the second chamber by communicating the second chamber with the third chamber when the air supply source and the first chamber are communicated with each other. a factory air system that decompresses and supplies air from the second chamber to the air outlet together with the air in the second chamber. The factory air system of claim 1, comprising:
When the air supply source and the third chamber are communicated, the switching valve communicates the first chamber with the fourth chamber, thereby exhausting the air in the first chamber into the fourth chamber. a factory air system that depressurizes and sends air from the fourth chamber to the air outlet together with the air in the fourth chamber. A factory air system according to claim 1 or claim 2, wherein
The switching valve and the first chamber are connected via a first speed control valve that generates a controlled flow from the switching valve toward the first chamber and a free flow from the first chamber toward the switching valve. factory air system. A factory air system according to any one of claims 1 to 3,
The switching valve and the third chamber are connected via a second speed control valve that generates a controlled flow from the switching valve toward the third chamber and a free flow from the third chamber toward the switching valve. factory air system. A factory air system according to any one of claims 1 to 4,
Equipped with a mechanical valve that detects the position of the piston rod,
The factory air system, wherein the switching valve switches the communication state according to the pilot air output from the mechanical valve.

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