JPH0447432Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure increase device that increases and supplies fluid pressure.

The present inventors previously proposed a pressure boosting air supply device that can keep the output pressure approximately constant regardless of increases or decreases in load flow rate or pressure (Utility Model Publication No. 59-144203).
Publication No.).

In this device, pistons in a pair of cylinders that are connected to each other through a partition wall are connected to each other by a rod that penetrates the partition wall in an airtight manner. The drive chambers are connected to the inlet port via an inlet check valve that allows air to flow in, and to the outlet port via an outlet check valve that allows air to flow out, and are provided within the partition walls on the outer end surfaces of the pistons in both cylinders. A driving valve is disposed to alternately switch and connect the inlet port and the exhaust port, and a switching push rod provided on the driving piece projects into the pressure intensifying chamber.

In such a pressure booster, it is desirable for the whole to be integrated into one block for handling purposes, and from the viewpoint of manufacturing and maintenance, each component is constructed like a block and their connections are It is desirable to be able to assemble it by hand, or to be able to maintain it by replacing parts of it.

From this perspective, the purpose of this invention is to improve manufacturing,
The object of the present invention is to provide a pressure booster that is easy to handle and maintain.

In order to achieve the above object, the pressure booster of the present invention connects a main body block equipped with an inlet port, an outlet port, and an exhaust port with a pair of cylinders sandwiching it, and a piston that slides within these cylinders. a check valve connected to the main body block by a rod passing through the main body block in an airtight manner, and allowing fluid to flow into the main body block only from an inlet port to each pressure increasing chamber inside both pistons;
A check valve that only allows fluid to flow from each of the pressure intensification chambers to the outlet port is installed on both sides of the main body block by housing the check valve element in the valve hole provided in the side surface of the main body block facing the pressure intensification chamber. A switching valve is installed in the main body block by holding it by a side plate fixed to the main body block, and a switching valve is installed in the main body block to switch the drive chambers on the outside of both pistons into communication with the inlet port and the exhaust port. It is configured to be incorporated by protruding from the side plate and holding it by the side plate.

In the pressure booster of the present invention, most of the various valves and the flow paths that communicate them are provided within the main body block, and the fluid passages are opened on the side of the main body block facing the pressure increase chamber. A check valve hole is provided in the main body block to accommodate the check valve body, and a switching valve is housed in a through hole penetrating the main body block, and these are held by a side plate fixed to the side surface of the main body block. Therefore, by installing side plates on both sides of the main body block, the check valve body and directional control valve can be held on the main body block. Since no machining is required, machining the main body block and assembling the valve are extremely simple.

Additionally, if the various valves are assembled into the main body block in advance using the side plate, the overall assembly can be done by simply integrating the main body block and a pair of cylinders. It is easy to perform and therefore greatly simplifies manufacturing and maintenance.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, which schematically shows the basic structure of the pressure booster of the present invention, 1 is a main body block, and the main body block 1 is equipped with an inlet port 2, an outlet port 3, and an exhaust port 4. The pistons 6a and 6b of the pair of cylinders 5A and 5B, which are sandwiched and arranged on both sides, are connected to the main body block 1.
The pistons 6 in both cylinders 5A and 5B are connected to each other by rods 7 passed through the cylinders 5A and 5B in an airtight manner.
a, 6b inside them (main block 1
Pressure intensifying chambers 8a, 8b and drive chambers 9a, 9b are defined on the side) and outside, respectively.

Inlet check valves 10a and 10b, outlet check valves 11a and 11b, a governor 12, and a switching valve 13 are incorporated into the fluid flow path formed inside the main body block 1, and furthermore, the outside of the main body block 1 includes Pipe 14 constituting an external flow path
a and 14b are attached.

The inlet check valves 10a, 10b only allow fluid to flow from the inlet port 2 into the pressure intensifier chambers 8a, 8b, and the outlet check valves 11a, 11b allow fluid to flow from the pressure intensifier chambers 8a, 8b into the outlet port 3. It only allows outflow. Further, the governor 12 is for controlling the output pressure (secondary pressure) from the outlet port 3, and the switching valve 13 is for controlling the output pressure (secondary pressure) from the outlet port 3.
and 9b are switched to communicate with the inlet port 2 via the governor 12, and the other is connected to the exhaust port 4.
This is for switching communication between the two. Thus, the inlet 16, feedback port 17, and outlet 18 of the governor 12 are communicated with the inlet port 2, the outlet port 3, and the input port 19 of the switching valve 13, respectively, through channels in the main body block 1, and The output ports 20a, 20b and the exhaust ports 21a, 21b of the switching valve 13 are communicated with the drive chambers 9a, 9b and the exhaust port 4 through channels in the main body block 1 and channels in the pipes 14a, 14b, respectively, Further, the position switching push rods 22a, 22b provided on the switching valve 13 are connected to the pressure increasing chamber 8a,
When the pistons 6a, 6b which are projected into the drive chambers 8b and thereby reciprocate come into contact with the push rods 22a, 22b, the rods 22a, 22b are pushed in alternately and the switching valve 13 is switched, and the drive chambers 9a, 9b are switched. Governor 12 and exhaust port 4
The structure is such that the terminals are alternately communicated with each other.

In the pressure booster having the above configuration, the state shown in FIG. 1 is when the pistons 6a, 6b and rod 7 have reached the leftward stroke end in the same figure, increasing the pressure of the compressed air in the right pressure boosting chamber 8a. When the output is finished from the outlet port 3, the switching valve 13 is switched to the position shown, and the left drive chamber 9b is switched to the switching valve 1.
At the same time, the right drive chamber 9a is connected to the switching valve 1 through the inlet port 2 and the governor 12.
3 and exhaust port 4 are shown open to the atmosphere. Therefore, the pistons 6a, 6b and the rod 7 are started to be driven to the right by the resultant force of the force acting on the piston 6b in the left driving chamber 9b and the force acting on the piston 6a in the right pressure intensifying chamber 8a. Accordingly, the compressed air in the left pressure intensifying chamber 8b is compressed, and the outlet check valve 11
outflows from outlet port 3 through b. In parallel with this, line air as primary pressure is supplied from the inlet port 2 through the inlet check valve 10a to the pressure intensifying chamber 8a.
Of course, there will be an inflow into the country.

In this way, when the pistons 6a, 6b and rod 7 reach the rightward stroke end, the push rod 22b is pushed and switched by the left piston 6b, and the valve 13 is automatically switched to the opposite position from that shown in the figure. As a result, the pistons 6a, 6b and the rod 7 move to the left again, and the line air that has risen in the pressure intensifying chamber 8a on the right side is outputted from the outlet port 3 through the outlet check valve 11a. Pressurized line air is continuously output from the pressure intensification chamber.

Further, the secondary pressure outputted from the outlet port 3 of the pressure booster as described above is set to an arbitrary value by the governor 12, and the secondary pressure is regulated substantially constant regardless of the increase or decrease in the load flow rate. be pressured. That is, the secondary pressure at the outlet port 3 is fed back to the feedback port 17 of the governor 12, and the output pressure of the governor 12 is increased or decreased according to fluctuations in the secondary pressure.
The pressure of the compressed air applied to the drive chambers 9a, 9b is adjusted, and the secondary pressure is regulated to a desired set pressure.

The above-mentioned pressure increase device is specifically constructed as shown in FIG. 2 and subsequent figures.

In the pressure booster shown in FIGS. 2 to 8,
The main body block 1 includes a center block 31 and an adapter 32 attached thereto, and has an inlet port 2 on the back of the center block 31 and an outlet port 3 for selectively opening on the front, back and bottom surfaces thereof.
However, there are also exhaust ports 4 on both sides of the adapter 32.
are formed respectively. Further, the cylinders 5A and 5B have cylinder tubes 33a and 33b.
As shown in FIG. 2, the cylinder 5B is divided into a pressure increasing chamber 8b and a driving chamber 9b by a piston 6b, and the cylinder 5A has a pressure increasing chamber 8b and a driving chamber 9b, as shown in FIG. They are symmetrically constructed, and the pistons of both cylinders 5A, 5B are connected by the rod 7 mentioned above. Then,
The main body block 1 and cylinders 5A, 5B are as follows:
As shown in FIGS. 4, 6, and 8, both ends of the cylinder tubes 33a, 33b are fitted into the annular convex portions 31c protruding from both sides of the center block 31 via seals, and the side cover 34a ,34b
and are integrated by fastening with four tie rods 35a to 35d passing through the main body block 1, and elbow-shaped conduit joints 30a, 30b attached to both sides of the adapter 32 and side covers 34a, 34b. Between the pipes 14a and 14b
is installed.

Of the four check valves built into the main body block 1, there is one from the pressure boosting chamber 8b to the outlet port 3.
The check valve 11b allows fluid to flow out to the
As shown in FIGS. 4 to 6, the valve hole 36a at the end of the flow path 36 passing through the center block 31
A check valve seat 37a, a cylindrical valve guide 37b, and a perforated plate 37c are arranged from the pressure intensifying chamber 8b side, and these are fixed to the side plate 31b on the side surface of the center block 31, and the step inside the valve hole 36a. and fix it by sandwiching it between the valve guides 3 and 3.
A check valve body 38 having a triangularly cut out periphery as shown in FIG. It is configured to be separated from 37a and opened. A check valve provided at the other end of the flow path 36 is also constructed in the same manner.

On the other hand, the inlet check valve 1 only allows fluid to flow from the inlet port 2 into the pressure increase chambers 8a and 8b.
0a, 10b, as shown in FIGS. 4, 5, and 8, the valve hole 39a is inserted into the valve hole 39a at the end of the flow path 39 passing through the center block 31.
A check valve body 40 is provided which approaches and separates from the check valve seat 39b inside the center block 31, and is held in a non-escapeable manner by the porous portions of side plates 31a and 31b fixed to the side surfaces of the center block 31. The check valve body 40 is similar to the check valve seat shown in FIG.
9b is closed, but is separated from the check valve seat 39b by fluid pressure from the flow path side, and opens it.

Further, the governor 12 incorporated into the main body block 1 has an inlet 16 and an outlet 1, as shown in FIG.
8 and a feedback port 17, the inlet 16 is connected to the inlet port 2 of the center block 31, and the outlet 18 is connected to the inlet port 2 of the center block 31.
is communicated with the input port 19 of the switching valve 13, and the feedback port 17 is communicated with the outlet port 3 of the center block 31, respectively. The inlet 16 and outlet 18 of the governor 12 communicate with each other through a valve seat 42 formed in a valve seat body 41, and the valve seat 42 is configured to be openable and closable by a valve body 44 biased by a valve spring 43. A rod-shaped relief valve body 45 integrally fixed to the valve body 44 projects into a feedback chamber 46 communicating with the feedback port 17. The relief valve seat 45 is for opening and closing the relief valve seat 48 of the relief valve seat body 47, and is connected to a diaphragm 50 that partitions the feedback chamber 46 and the relief chamber 49 communicating with the atmosphere.
A pressure regulating spring 53 for setting secondary pressure is inserted through the diaphragm shell 51 mounted thereon, and is compressed between the shell 51 and the spring retainer 52, and the spring retainer 52 is connected to the handle 5.
It is supported by a pressure adjusting screw 56 which moves forward and backward with respect to the bonnet 55 by rotation of 4.

In the governor 12 configured as described above, the valve seat 42 and the relief valve seat 48 are opened and closed by the vertical movement of the diaphragm 50. That is, the biasing force of the pressure regulating spring 53 acting on the upper surface of the diaphragm 50 causes the feedback chamber 46 to act on the lower surface of the diaphragm 50.
, the diaphragm 50 keeps the relief valve seat 48 closed by the relief valve body 45 and compresses the valve spring 43 to move the valve seat 42 according to the difference in the urging force. Open it. Therefore, 2 at outlet port 3
When the next pressure is lower than the pressure set by the pressure regulating spring 53, the feedback chamber 46 becomes a low pressure state, and the pressure regulation is supplied from the inlet 16 to the outlet 18 through the valve seat 42, and the pressure is controlled via the switching valve 13. The fluid pressure supplied to the chamber is increased, thereby increasing the driving force of the piston and rod and increasing the secondary pressure at the outlet port 3. On the contrary, when the urging force due to the fluid pressure in the feedback chamber 46 is large, the relief valve seat body 47 separates from the relief valve body 45 and the relief valve seat 48
At the same time, the valve body 44 urged by the valve spring 43 closes the valve seat 42, and the secondary pressure is reduced to the set pressure.

The set pressure in the governor 12 is adjusted by turning the handle 54 to adjust the biasing force of the pressure regulating spring 53.

In the figure, 57 is an orifice, 2 of outlet port 3.
The pulsating changes in the next pressure are reflected in the feedback chamber 46.
59 indicates an atmospheric communication hole.

The switching valve 13 incorporated in the center block 31 is configured as a spool valve, as shown in FIG. That is, the center block 31 is formed with a through hole 61 that communicates with the pair of pressure increasing chambers 8a and 8b, and the sleeve 62 fitted in the through hole 61 is connected to the pair of side plates 31a through spacers 64a and 64b. , 31b, and there are lands 66a, 66 inside them that slide within the sleeve 62 on the outer peripheral surface.
A flow path switching spool 65 equipped with a spool 65 and push rods 22a and 22b that press the spool 65.
is inserted so that it can slide in the axial direction. The push rods 22a, 22b have flanges 68a, 68b fixed to their outer ends, which function as spring seats, and springs 69a, 69b are compressed between the flanges 68a, 68b and spacers 64a, 64b. 22b is always urged toward the pressure intensifying chambers 8a, 8b.

Therefore, the input port 1 in the switching valve 13
9 and output ports 20a, 20b communicate with the outlet 18 of the governor 12 and one end of the pipes 14a, 14b, and the exhaust ports 21a, 21b communicate with the exhaust port 4, respectively.

This switching valve 13 is connected to the push rod 22.
By alternately pushing a and 22b in the axial direction, it is possible to switch between the illustrated position and other positions. That is, in the illustrated state, the left push rod 22b
When the spring 69b is pushed in by the piston 6b while compressing the spring 69b, the spool 65 is also pushed accordingly and switched. Thereafter, when the pressing force of the left push rod 22b is removed, the push rod 22b returns to the state shown in the figure due to the biasing force of the spring 69b, but the spool 65 remains in the switched state. In this state, when the right push rod 22a is pressed, the spool 6
5 is switched to the position shown.

The above pressure booster can be used by being attached in any direction. For example, in order to attach the bottom surface to the mounting surface 73 in FIGS. 2 and 3, the outer end surface of the side covers 34a, 34b should be Foot 74a, 74b having an L-shaped cross section may be fixed to the lower part of the pressure booster using two lower tie rods 35c, 35d, and these feet 74a, 74b may be used to attach to the mounting surface 73. To attach the side surface of the foot to the mounting surface, the foot may be attached horizontally to the side cover 34a, 34b using the tie rods 35a, 35d or 35b, 35c on the side surface. Each of the above feet 74a, 74b
is constructed with two sides having different widths, and therefore, by changing the side to be attached to the side cover, the distance L between the pressure booster and the mounting surface can be adjusted.

The pressure intensifier of the present invention has a check valve that only allows fluid to flow into the pressure intensifier chamber from the inlet port, a check valve that only allows fluid to flow out from the pressure intensifier chamber to the outlet port, and a check valve that only allows fluid to flow from the inlet port into the pressure intensifier chamber. A switching valve that switches between the port and the exhaust port for communication is held by a side plate and incorporated into the main body block.

By attaching side plates to both sides of the main body block, the check valve body and directional control valve can be held on the main body block, and there is no need to process the main body block to hold them. Processing and valve assembly are extremely simple. Moreover, since fluid can be connected and discharged to these valves by simply connecting piping to the inlet port and the outlet port, piping work can be simplified.

Furthermore, if the main body block is manufactured in advance with these valves installed, the overall assembly can be easily accomplished by integrating the main body block and a pair of cylinders, which is an extremely simple assembly process. It is therefore extremely simple to manufacture and maintain.

[Brief explanation of the drawing]

Figure 1 is a basic configuration diagram of an embodiment of the present invention, Figures 2 and 3 are a front view and left side view showing the specific configuration, and Figures 4 and 5 are a side view and cross section of the center block. 6, and 8 are sectional views of essential parts of the main body block, and FIG. 7 is a sectional view taken along the line X--X in FIG. 6. 1...Main block, 2...Inlet port, 3...
...Outlet port, 4...Exhaust port, 5A, 5B...
... Cylinder, 6a, 6b ... Piston, 7 ... Rod, 8a, 8b ... Pressure increase chamber, 9a, 9b ... Drive chamber, 10a, 10b, 11a, 11b ... Check valve, 13 ... Switching valve, 22a, 22b...
...Push rod, 31a, 31b...Side plate, 36a, 39a...Valve hole, 38, 40...
...Check valve body.

Claims (1)

[Scope of utility model registration request] A main body block equipped with an inlet port, an outlet port, and an exhaust port is connected to a pair of cylinders sandwiching the main body block, and pistons sliding within these cylinders are connected to each other by a rod that penetrates the main body block in an airtight state. , a check valve that only allows fluid to flow from the inlet port into each pressure increasing chamber inside both pistons, and a check valve that only allows fluid to flow out from each pressure increasing chamber to the outlet port. A check valve element is housed in a valve hole provided on the side surface of the main body block facing the pressure intensifying chamber, and the check valve element is assembled by being held by side plates fixed to both sides of the main body block. , a switching valve for switching and communicating the drive chambers on the outside of both pistons with the inlet port and the exhaust port is incorporated by protruding the switching push rod into the pressure intensifying chamber and holding it by the side plate. Features a pressure booster.