JPH0592475U - Air booster - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention aims to increase the pressure of a low pressure air of a constant pressure in an air source in a factory to a high pressure as needed. A small-diameter piston cylinder 4 for increasing pressure and a large-diameter piston for operating this small-diameter piston cylinder 5 are provided in a main pipe 5 having an air outlet 13 connected to an air source of a constant pressure and connected to an air tank or an air-using device. A booster 2 composed of a cylinder 3 is connected, and air in the main pipe 5 can be supplied to and discharged from the large-diameter piston cylinder 3 of the booster 2 by a control valve 8a. The control valve 8 is opened and closed by air pressure.
A pressure setting valve 7a for supplying operation air is provided in a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air booster that boosts air from a constant-pressure air source as needed.

[0002]

[Prior Art]

 At automobile manufacturing plants, tools such as a torque wrench that use air and air from a constant pressure air source inside the plant are used to check for leaks in vehicle piping.

[0003]

[Problems to be solved by the device]

 There is no inconvenience when the air pressure to be used is constant pressure in time, but when the air pressure higher than the constant pressure is required, the pressure becomes insufficient and a predetermined work cannot be performed. In such a case, a large compressor is used separately, but it is very difficult to transport and install the large compressor to the work position for outdoor work outside the factory.

An object of the present invention is to provide an air booster that solves the above conventional problems.

[0005]

[Means for Solving the Problems]

 To achieve the above object, the present invention is characterized by a main pipe having an air outlet connected to an air source having a constant pressure at one end and an air tank or an air-using device at the other end, and the main pipe. A booster consisting of a small-diameter piston cylinder for increasing pressure connected to a pipe and a large-diameter piston cylinder for operating this small-diameter piston cylinder; a control valve for supplying and discharging air in the main pipe to the large-diameter piston cylinder of the booster; A pressure setting valve that opens and closes by an air pressure higher than a certain pressure at the air outlet of the main pipe to supply operation air to the control valve.

[0006]

[Action]

 With the above configuration, the booster is not operated within the range set by the pressure setting valve, and the air of constant pressure from the air source is used. However, when the working pressure of air exceeds a certain level, the pressure setting valve opens due to the back pressure generated at the air outlet of the main piping, and the operation air is supplied to the control valve to feed the large-diameter piston cylinder of the booster to the main piping. The control valve is switched to supply air, and the small diameter piston cylinder is operated by the large diameter piston cylinder to boost the air in the small diameter piston cylinder and send it to the main pipe, increasing the pressure of the constant pressure air flowing through the main pipe.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a portable dolly on which casters are mounted, and the device of the present invention is installed on the dolly 1. That is, the main pipe 5 having an air outlet 13 whose one end is connected to an air source of a constant pressure (for example, an air source in a factory) and whose other end is connected to air tanks 15a and 15b described later or an air using device (not shown). The booster 2, the pressure setting valve 7a, the pressure regulator 7b, and the two air tanks 15a and 15b are mounted.

One of the air tanks 15a and 15b is connected to the air outlet 13 of the main pipe 5, and the one air tank 15a and the other air tank 15b are connected by a communication pipe 16. A pressure reducing valve 17 is provided in one of the air tanks 15a, and is connected to an air-using device via the pressure reducing valve 17. When air-using equipment is connected to the air outlet 13 of the main pipe 5 via a hose, the air tanks 15a and 15b are not necessary.

As shown in FIG. 2, the booster 2 is composed of a small-diameter piston cylinder 4 for increasing pressure and a large-diameter piston cylinder 3 for operating the small-diameter piston cylinder 4, and the small-diameter piston cylinder 4 has a small-diameter piston. A large-diameter piston 18 connected to the small-diameter piston 19 by a connecting shaft 20 is inserted in the large-diameter piston cylinder 3 so as to be movable back and forth. Therefore, the inside of the small diameter piston cylinder 4 is divided into the front chamber 4a and the rear chamber 4b by the small diameter piston 19, and the inside of the large diameter piston cylinder 3 is divided into the front chamber 3a and the rear chamber 3b by the large diameter piston 18.

The front chamber 4a of the small diameter piston cylinder 4 is connected to the main pipe 5 by a connecting pipe 11, and check valves 6a and 6b arranged in the same direction are arranged in the main pipe 5 before and after the connecting point of the connecting pipe 11. Has been done.

Further, an air outlet 13 and a pressure setting valve 7a are provided in the main pipe 5 downstream of the check valve 6b on the downstream side.

The rear chamber 3b of the large-diameter piston cylinder 3 of the booster 2 is connected to the main pipe 5 via the first control valve 8a. The first control valve 8a has an air introduction port P1, an air discharge port P2, an operation air introduction port P3, and an air discharge port P4. The air introduction port P1, the air discharge port P2, and the air discharge port P2. The spool valve 22a for switching between the port P4 and the port P4 is constantly pressed by the spring 23a toward the operation air introducing port P3.

The air introduction port P1 is connected to the main pipe 5 by a pipe 9, and the air discharge port P2 is connected to the rear chamber 3b of the large-diameter piston cylinder 3 by a pipe 10. The air exhaust port P4 communicates with the atmosphere. The operation air introduction port P3 will be described later.

Reference numeral 8b is a second control valve. The second control valve a has the same structure as the first control valve 8a. That is, the spool valve has an air introduction port P5, an air discharge port P6, an operation air introduction port P7, and an air discharge port P8, and switches the air introduction port P5, the air discharge port P6, and the air discharge port P8. 22b is constantly pressed by the spring 23b toward the operation air introducing port P7.

A pressure regulator 7 b connected to the air outlet 13 is connected to the operation air introduction port P 7 by a pipe 14.

A first piston valve 21a is arranged at the front end position of the front chamber 3a of the large-diameter piston cylinder 3 of the booster 2, and a second piston valve 21b is arranged at the rear end position of the rear chamber 4b of the small-diameter piston cylinder 4. ing. The first piston valve 21a opens when the large-diameter piston 18 abuts at the forward end of the large-diameter piston 18, and the second piston valve 21b opens when the small-diameter piston 19 abuts at the retracted end of the small-diameter piston 19. It opens.

The pressure setting valve 7a and the air introduction port P5 are connected by a pipe 12, and the air discharge port P6 and the second piston valve 21b are connected by a pipe 24.

The first piston valve 21 a is connected to the operation air introducing port P 3 of the first control valve 8 a by a pipe 25, and the pipe 25 and the second piston valve 21 b are connected by a connecting pipe 26. P9 indicates an exhaust port.

Next, the operation of the present invention will be described. FIG. 2 shows an operating state in which an air pressure below a set pressure, that is, below a certain pressure of an air source in a factory is used. In this case, the air A having a constant pressure introduced into the main pipe 5 from an air source (not shown) is slightly discharged from the air outlet 13.

In this case, the constant-pressure air A introduced into the main pipe 5 passes through the check valve 6a, and a part of the air A enters the front chamber 4a of the small-diameter piston cylinder 4 of the booster 2 from the connecting pipe 11. The small diameter piston 19 is pushed and moved to the retracted end. When the small-diameter piston 19 moves backward, the large-diameter piston 18 also moves to the backward end by the connecting shaft 20.

At the backward movement end of the small-diameter piston 19, the small-diameter piston 19 contacts the second piston valve 21b to switch the second piston valve 21b to the open state, but the large-diameter piston 18 is more than the first piston valve 21a. The first piston valve 21a remains closed because it is separated.

Further, the air A having a constant pressure passing through the check valve 6b downstream from the communication pipe 11 enters the pressure setting valve 7a, but the pressure setting valve 7a is set to the constant pressure of the air pressure A. The inlet of the pipe 12 is closed. Similarly, the pressure regulator 7b also closes the inlet of the pipe 14.

Therefore, the spool valve 22b of the second control valve 8b is pressed by the spring 23b toward the operation air introducing port P7 to communicate the air introducing port P5 and the air deriving port P6. Since the setting valve 7a closes the inlet of the pipe 12 and the first piston valve 21a is closed, operation air is not introduced into the operation air introduction port P3 of the first control valve 8a, and the first control The spool valve 22a of the valve 8a closes the air introduction port P1 by being pressed by the spring 23a, the air discharge port P2 communicates with the air discharge port P4, and the rear chamber 3b of the large-diameter piston cylinder 3 of the booster 2 is opened to the atmosphere. As a result, booster 2 does not increase its pressure.

As a result, the air A having a constant pressure from the air source is discharged from the air outlet 13 of the main pipe 5.

FIG. 3 shows an initial state of operation when the pressure is equal to or higher than a set pressure, that is, the working pressure of an air used for a tool such as a torque wrench exceeds a certain pressure. In this case, the constant-pressure air A introduced from the air source (not shown) into the main pipe 5 is discharged from the air outlet 13 as the pressure-increased air A1.

In this case, a back pressure exceeding a certain pressure is generated at the air outlet 13, and this acts on the pressure setting valve 7 a so that the pressure setting valve 7 a opens the inlet of the pipe 12. When the back pressure exceeding this constant pressure does not reach the set maximum pressure, the pressure regulator 7b still closes the inlet of the pipe 14 and introduces the operation air into the operation air introduction port P7 of the second control valve 8b. Is shut off. Therefore, the spool valve 22b of the second control valve 8b is still pressed by the spring 23b so that the air introduction port P5 and the air derivation port P6 communicate with each other.

Therefore, the back pressure exceeding the predetermined pressure passes through the pipe 12, the air introduction port P5, the air introduction port P6, and the pipe 24, passes through the opened second piston valve 21b, and then the pipe 26 through the pipe 25. To introduce. Since the first piston valve 21a is closed, the back pressure introduced into the pipe 25 enters the operation air introduction port P3 of the first control valve 8a, and the spool valve 22a resists the pressing force of the spring 23a. In the right direction, the air inlet port P1 and the air outlet port P2 are communicated with each other, and the air outlet port P4 is closed.

As a result, the air A having a constant pressure from the air source is supplied from the pipe 9 to the rear chamber 3b of the large-diameter piston cylinder 3 of the booster 2 through the air introduction port P1, the air discharge port P2, and the pipe 10. Although the front chamber 4a of the small-diameter piston cylinder 4 is filled with a constant pressure of air A, the large-diameter piston 18 moves forward due to the pressure-receiving area difference between the large-diameter piston 18 and the small-diameter piston 19, and the connecting shaft 20 The small-diameter piston 19 is moved forward via the compressor to compress and increase the air A having a constant pressure (for example, 5 kg / cm2) filling the front chamber 4a of the small-diameter piston cylinder 4 to a certain pressure or more (for example, 8 kg / cm2) from the air outlet 13. ), The air A1 increased in pressure is discharged.

When the small diameter piston 19 moves to the forward end, the second piston valve 21b closes, and the forward end of the large diameter piston 18 switches the first piston valve 21a to the exhaust port P9. As a result, the operation air of the first control valve 8a is shut off, and the first piston valve 21a communicates with the atmosphere through the exhaust port P9. Therefore, the spool valve 22a is pushed leftward by the spring 23a, As in the state of No. 2, the air introduction port P1 is closed, the air outlet port P2 and the air discharge port P4 are communicated with each other, and the rear chamber 3b of the large-diameter piston cylinder 3 is communicated with the atmosphere.

Therefore, the air A having a constant pressure is reintroduced into the front chamber 4a of the small-diameter piston cylinder 4, and the small-diameter piston 19 and the large-diameter piston 18 are returned to their original positions at the retracted ends. The small-diameter piston 19 and the large-diameter piston 18, which have returned to the original position, move forward and backward as described above when a back pressure equal to or higher than the constant pressure of the air A of the air source is generated at the air outlet 13. The pressure is increased by repeating the reciprocating operation of.

By the way, when the pressure rises to the maximum pressure (for example, 9.8 kg / cm 2) due to the forward and backward reciprocating operations of the small-diameter piston 19 and the large-diameter piston 18, there is a risk of damage to tools and the like. In this case, the pressure regulator 7b operates to open the inlet of the pipe 14 and introduces the operation air into the operation air introduction port P7 of the second control valve 8b, and as shown in FIG. The spool valve 22b is pushed to the right against the pressing force of the spring 23b, the air introduction port P5 is closed, and the air outlet port P6 and the air discharge port P8 are connected.

As a result, the operation air introduced into the operation air introduction port P3 of the first control valve 8b via the pipe 24, the second piston valve 21b, the pipe 26, and the pipe 25 is transferred to the second control valve 8b. Of the first control valve 8a is pushed to the left by the spring 23a, and the air introduction port P1 is closed as shown in the state of FIG. The rear chamber 3b of the large-diameter piston cylinder 3 communicates with the atmosphere by connecting the port P2 and the air exhaust port P4.

Therefore, the air in the rear chamber 3b of the large-diameter cylinder 3 is discharged to the atmosphere, and the small-diameter piston 19 and the large-diameter piston 18 move to the retracted ends to stop the pressure boosting operation and prevent the adverse effects of the maximum pressure. To do.

In the above embodiment, the trolley 1 is a portable type with casters, and can be easily moved to the work site for outdoor work, but work that does not require movement. A stationary base may be used on site.

[0035]

[Effect of the device]

 As described above, according to the present invention, a small-diameter piston cylinder for increasing pressure and a large-diameter cylinder for operating this small-diameter piston cylinder are installed in a main pipe having an air outlet connected to an air source of a constant pressure and connected to an air tank or an air-using device. Connected to a booster consisting of a large-diameter piston cylinder so that the air in the main pipe can be supplied to and discharged from the large-diameter piston cylinder in the booster by a control valve, and the main pipe's air outlet can be opened and closed by an air pressure above a certain level. Since the pressure setting valve for supplying the operation air to the control valve is provided, it is possible to increase the pressure of the constant pressure of the air source to the high pressure by using the low pressure air of the constant pressure of the air source as needed. This has the advantage that a separate large compressor facility can be omitted.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing an example of the present invention.

FIG. 2 is a sectional view of an essential part of the present invention showing an operating state at a set pressure or less.

FIG. 3 is a sectional view of an essential part of the present invention showing an operating state above a set pressure.

FIG. 4 is a sectional view of an essential part of the present invention showing an operating state at the maximum set pressure.

[Explanation of symbols]

 1 Bogie 2 Booster 3 Large Piston Cylinder 4 Small Piston Cylinder 5 Main Pipe 7a Pressure Setting Valve 7b Pressure Regulator 8a First Control Valve 8b Second Control Valve 13 Air Outlet 21a First Piston Valve 21b Second Piston Valve 22a Spool Valve 22b Spool valve P1 Air inlet port P2 Air outlet port P3 Operation air inlet port P4 Air exhaust port P5 Air inlet port P6 Air outlet port P7 Operation air inlet port P8 Air outlet port P9 Exhaust port

Claims (1)

[Scope of utility model registration request] 1. A main pipe having one end connected to an air source of constant pressure and the other end having an air outlet connected to an air tank or an air-using device, a small-diameter piston cylinder for increasing pressure connected to the main pipe, and the main pipe. A booster consisting of a large-diameter piston cylinder for operating a small-diameter piston cylinder,
A control valve for supplying / discharging air in the main pipe to / from a large-diameter piston cylinder of the booster; and a pressure setting valve for opening / closing by an air pressure higher than a certain pressure at the air outlet of the main pipe to supply operation air to the control valve. An air booster characterized by having.