JPS639791A - Flow pass switching valve - Google Patents

Abstract

PURPOSE:To make switching of flow passes with a simple construction, by making a pair of switching valves to function so as to connect one of a pair of supply ports to a low pressure port at the same time as the other one of said supply ports is connected to a high pressure port. CONSTITUTION:When a solenoid 60 is electrically energized, a plunger 61 is protruded against a spring 54 to push a switching valve 50, a moving rod 55, and another switching valve 51 together, causing a supply port 41 to connect with a low pressure port 47 while the other supply port 41 to connect with a high pressure port 46. Consequently, for instance, pilot pressure can be led to pilot pressure passes 31, 32, to drive the piston 36 of a valve 20 to the right. When electrical energizing of said solenoid 60 is cut off, said switching valve 50 cuts the continuity between said ports 41, 47 and connects said supply port 41 to said high pressure port 46, while said other switching valve 51 cuts the continuity between said other ports 42, 46 and connects said port 42 to said low pressure port 47, driving said piston 36 to the left.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a flow path switching valve used to alternately supply high pressure and low pressure to a pair of clam ports.

"Prior art and its problems" According to the notation of electromagnetic switching valves, this type of flow path switching valve is:
It is expressed as shown in FIG. This flow path switching valve 10 is located between a pair of supply ports 11, 12, a high pressure port 13, and a low pressure port 14, and when the port 10a is connected to these pipes, the supply port The supply port 12 is connected to the low pressure port 14, respectively, and the supply port 11 is connected to the low pressure port 14 when connected to the port 10blFr.
2 are connected to the high pressure port 13, respectively. , Flow path switching valves with such functions are known in the past with various structures such as spool valves and diaphragm valves, but all of these have complex structures and require high processing accuracy. , which was expensive.

``Object of the invention'' The present invention provides the following advantages:
It is an object of the present invention to obtain a switching valve capable of switching the above-mentioned flow paths with a simple structure.

"Summary of the Invention" The present invention basically uses a pair of on-off valves that can operate independently, and opens and closes them in conjunction with each other. That is, in the present invention, for a pair of supply ports,
A flow path switching valve that selectively connects a high-pressure port and a low-pressure port, a pair of switching valves attached to each pair of supply ports and communicating the supply ports with either the high-pressure port or the low-pressure port; The switching valve is provided with an interlocking drive means that operates in conjunction so that when one supply port is communicated with the low pressure port or the high pressure port, the other supply port is communicated with the high pressure port or the low pressure port. It is characterized by this.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. In this embodiment, the present invention is applied to a flow path switching valve that operates a diaphragm type pilot operated directional switching valve, and FIGS. 1 and 2 show the first embodiment.

First, diaphragm type pilot operation direction switching well '20
To explain this, the basic form of this directional valve is disclosed in U.S. Patent No. 4.
, No. 516,605. diaphragm 21
is sandwiched between the flow path block 22 and the control block 23. The flow path block 22 is formed with a single inflow hole 25 that receives pressurized air from the pump 24, and a pair of supply holes 26.27 and a discharge hole 28.29. These inflow holes 25, supply holes 26, 27, and discharge holes 2
The diaphragm 21 is opened between the supply hole 26 (27) and the inflow hole 25 and between the supply hole 26 (27) and the discharge hole 28 (29). It is opened and closed by

That is, the control block 23 has a pilot pressure passage 30
33 are formed. Pilot pressure passage 30 (
31) is in the center of the supply hole 26 (27), and the pilot pressure passage 32 (33) is in the center of the supply hole 26 (27) and the discharge hole 28 (
29), and when pilot pressure is applied from here, the diaphragm 21 closes to the flow path block 2.
2 side, cutting off the communication between the supply hole 26 (27) and the inflow hole 25, or the supply hole 26 (27) and the discharge hole 28 (
29) Cut off communication.

In this example, the cylinder device 35 is connected to the supply hole 26.27, and therefore, as shown in FIG.
The pressurized air supplied to the piston 5 is supplied to the left chamber of the cylinder device 135, and the piston 36 moves to the left. At this time, the air in the stone chamber of the cylinder device 35 is discharged from the supply hole 27 to the discharge hole 29. On the other hand, as shown in FIG. 2, when pilot pressure is applied to the pilot pressure passage 30.33, the pressurized air supplied to the inflow hole 25 is supplied to the right side of the cylinder device 35, and the piston 36 moves to the right. At this time, the air in the left chamber of the cylinder assembly 35 is discharged from the exhaust hole 26 through the
It is discharged at 8.

The above diaphragm type directional control valve therefore has a pilot pressure passage 30 (33) and a pilot pressure passage 31 (32).
) is required to have a flow path switching valve that alternately selects and guides pilot pressure and atmospheric pressure (pressure lower than pilot pressure).

The present invention proposes a flow path switching valve suitable for use, for example, for such purposes. The valve body 40 has a first supply port 41 communicating with the pilot pressure passage 30 (33) and a second supply port 42 communicating with the pilot pressure passage 31 (32).
42 communicate with valve chambers 43 and 44, respectively. Valve chamber 4
3 and 44 communicate with each other through a communication path 45, and a high pressure port (pilot pressure port) 46 opens into this communication path 45. The valve body 40 also includes valve chambers 43 and 44.
Low pressure ports (atmospheric pressure ports) 47 and 48 are formed on the same axis as the communication passage 45 and communicate with each other.

The pole valves 5o and 51 inserted into the valve chambers 43 and 44 constitute switching valves that can each operate independently. This Pall valve 50 (51) is connected to the communication passage 45 or the low pressure port 47.
By approaching and separating the valve seat at the end of 48, the supply port j
1 (42) is selectively communicated with the communication path 45 (high pressure port 46) and the low pressure port 47 (48). Among them, the ball valve 50 is biased by a compression spring 54 so as to communicate the supply port 42 with the low pressure port 48 and cut off the communication with the high pressure port 46 in the free state. On the other hand, the ball valve 51 communicates with the ball valve 50 through an interlocking port 55 loosely inserted into the communication path 45, and indirectly receives the biasing force of the compression spring 54, and due to this biasing force, the ball valve 51 is not in the free state. The supply port 41 is communicated with the high pressure port 46 and disconnected from the low pressure port 47.

Brush jar 61 of solenoid 6o as interlocking drive means
is engageable with the ball valve 50 through the low pressure port 47 . When this solenoid 60 is in the energized state, its plunger 61 protrudes to the right in the figure, and the compression spring 5
4, pushing the ball valve 50, the interlocking rod 55, and the ball valve 51 against the force of At the same time, the ball valve 5 connects the supply port 42 to the high pressure port 46 and cuts off the communication with the low pressure port 48. In contrast, in the de-energized state, the plunger 61 is connected to the ball valve 5 as shown in FIG. It retreats to the non-coupled position with 5Q and returns to the free state due to the force of the compression spring 54.

Therefore, in the main flow path switching valve configured as described above, when the solenoid 6o in FIG. 1 is energized, the supply port 41 communicates with the low pressure port 47, and the supply port 42 communicates with the high pressure port 46. Therefore, as a result of the pilot pressure being applied to the pilot pressure passages 31, 32 of the directional control valve 2o, the piston 36 moves to the right. On the other hand, when the power to the solenoid 60 is cut off, the plunger 61 moves to the ball valve 5 as shown in FIG.
Move away from 0. Then, due to the force of the compression spring 54, the ball valve 50 cuts off communication between the supply port 41 and the low pressure port 47, and then connects the supply port 41 with the high pressure port 46, and at the same time, the ball valve 51 disconnects the supply port 41 and the high pressure port. 46 is cut off, and the supply port 42 is now communicated with the low pressure port 47. That is, as a result of the pilot pressure being applied to the supply port 42, the pilot pressure passage 30.3
The third side becomes the pilot pressure, and as a result, the piston 36 moves to the left.

FIG. 3 shows a second embodiment of the invention. This embodiment is characterized in that the left-right relationship between the pilot pressure port and the atmospheric pressure port in the first embodiment is reversed, and a solenoid 608 is disposed between a pair of switching valves. In other words, the high pressure ports 46a, 46b\ from the outside of the left and right valve chambers 43, 44, respectively! Low pressure ports 47a, 48a are opened from the inside! It is opened.

The solenoid 6 is connected to the low pressure ports 47a and 48a.
The plungers 61a, 61t) on both sides of 0 are warmly passed through so that the tip of the image can be engaged with the ball valve 50.51. In this embodiment, the ball valves 50 and 51 are both connected by compression springs 54a, 541) to communicate the common supply ports 41, 42 with the high pressure ports 46a, 46b in the free state and with the low pressure ports 47a, 48a. It is urged to cut off the

The plunger 61a (61b) is operated by the restoring spring 62.
When the solenoid 60 is energized to move to the right in the figure and the solenoid 60 is de-energized, the plunger 611)
Press to connect the supply port 42@low pressure port 48a. At this time, the plunger 61a separates from the ball valve 50. Therefore, the ball valve 50 closes the low pressure port 47a by the force of the compression spring 54a, and communicates the supply port 41 with the high pressure port 46a. On the other hand, when the solenoid 60 is energized, the plunger 61a (6Tb) is activated by the restoring spring 62.
As shown in the figure, the supply port 41 communicates with the low pressure port 47a and the high pressure port 46a, the supply port 42 is disconnected from the low pressure port 48a and communicates with the high pressure port 46t).

Therefore, the flow path switching valve of this embodiment has a solenoid 6o.
In the de-energized state, the supply port 41 is connected to the high pressure port 46.
a, and the supply port 42 communicates with the low pressure port 48a. Therefore, in this state, pilot pressure is applied to the pilot pressure passages 30 and 33 of the directional control valve 20, and the piston 36 moves to the left.On the other hand, when the solenoid 60 is energized, the supply port 41 is at low pressure as described above. port 4
7a, and as a result of the supply port 42 communicating with the high pressure port 46b, the pilot pressure passage 31 is connected from the supply port 42.
．． Pilot pressure is applied to 32, and piston 36 moves to the right.

In the above embodiment, a ball valve was used as an example of a switching valve attached to the supply ports 41, 42, but the present invention is also applicable to valves other than ball valves, such as valves made of an elastic body instead of balls, as shown in FIG. A switching valve using the valve body 64 operates in the same manner.

"Effects of the Invention" As described above, according to the flow path switching valve of the present invention, the independently operable switching valve attached to a pair of supply ports is connected to the low pressure port by the interlocking drive means. Alternatively, when the supply port is connected to the high pressure port, the other supply port is connected to the high pressure port or the low pressure port, so that a flow path switching valve that can reliably switch between high pressure and low pressure can be obtained. Since each switching valve itself can be a simple and inexpensive one, it is possible to provide a flow path switching valve that is simple and inexpensive as a whole.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views showing an embodiment in which the flow path switching valve of the present invention is applied to a diaphragm type pilot-operated directional switching valve in different operating states, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a cross-sectional view showing another structure of the switching valve. FIG. 2o... Directional switching valve, 21... Diaphragm, 22
. . . Channel block, 23 . . . Control block, 24.
... pump, 25 ... inflow hole, 26.27 ... supply hole, 28.29 ... discharge hole, 30.31. -32.
33...Pilot pressure passage, 35...Cylinder insertion, 36...Piston, 40...Valve body, 41
．． 42... Supply port, 43.44... Valve chamber, 45
...Connection path, 46.46a, 46 b ...High pressure port, 47.47a, 48.48 a-Low pressure port, 5
0.5]...Switching valve (ball valve), 54.54a, 5
4b...Compression spring, 55...Interlocking rod, 60...
・Solenoid, 61...plunger. Patent applicant Fujikura Rubber Industries Co., Ltd. Figure 3 Figure 4] Figure 4 Figure 5

Claims (1)

[Claims] In a flow path switching valve that selectively connects either a high pressure port or a low pressure port to a pair of supply ports, the flow path switching valve is attached to each of the pair of supply ports, and the supply port a pair of independently operable switching valves that communicate the supply port with either the high pressure port or the low pressure port; A flow path switching valve characterized by comprising: an interlocking drive means that is operated in conjunction so that the supply port communicates with the high pressure port or the low pressure port.