JPH0334487Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure combining valve that combines pressure from a plurality of pressure sources.

Conventionally, as shown in the first diagram, multiple pressure sources a, b, c
When controlling the operation of the control device d using the pressure from the pressure source as a signal, it is necessary to provide as many circuits e, f, and g connecting this and the control device d as there are pressure sources, but the distance between the pressure source and the control device is long. The total length of the circuits becomes long, making it uneconomical, and if there are obstacles along the way, it becomes difficult to install many circuits.

The present invention aims to eliminate these inconveniences, and has one end side of the spool 2 slidably provided in the valve housing 1 as a large pressure-receiving surface facing the synthetic pressure chamber 4 in which the synthetic pressure port 3 is formed. 5, and a stepped portion is formed on the other end side of the spool 2, and each stepped portion is used as a small pressure receiving surface 8 facing the partial pressure chamber 7 in which the dividing pressure port 6 is formed and facing the large pressure receiving surface 5. , the spool 2
A variable aperture 11 is provided in the middle of the variable aperture 11 which, by sliding, narrows the flow path 10 connecting the combined pressure chamber 4 and the tank port 9.
The combined pressure chamber 4 is connected to the partial pressure chamber 7 through a connecting path 13 with a check valve 12 interposed therebetween for allowing fluid to flow into the combined pressure chamber 4.

The spool 2 is connected to the valve housing 1 as seen in FIG.
The force generated by the pressure of the combined pressure chamber 4 acting on the large pressure-receiving surface 5 and each small pressure-receiving surface 8
The spool 2 slides to a position where the force generated by the pressure of each partial pressure chamber 7 is balanced. Reference numeral 15 denotes a recess formed on the outer periphery of the intermediate portion of the spool 2, and the tank port 9 and the connection path 13 are formed on both sides of the spool bore 14 at a location corresponding to the recess 15.
The spool 2 is connected to the synthetic pressure chamber 4 through a flow path 10 formed with an opening in the spool 2. In this case, when the spool 2 slides to some extent, the recess 15 is connected to the tank port 9 or the connection path 13, and when connected to the tank port 9, the variable valve housing 1 and the edge of the recess 15 are connected. The fluid flowing out to the tank port 9 is throttled by the throttle 11 according to the sliding distance of the spool 2. The connection path 13 is branched and connected to each partial pressure chamber 7, and each branch path 13a is provided with a check valve 12, respectively.

Its operation is controlled by a plurality of pressure sources 17 as shown in the third figure.
The pressure signals from a, 17b, 17c are transmitted to the control device 1.
8 and its operation is controlled. Each pressure source 17a, 17 is connected to each partial pressure port 6.
b, 17c are connected, one circuit is connected to the composite pressure port 3 by the control device 18, and each small pressure receiving surface 8
When the sum of the forces generated by the pressure of each pressure source acting on the large pressure receiving surface 5 is equal to the force generated by the pressure of the control device 18 acting on the large pressure receiving surface 5, the spool 2 is moved to the tank port 9 and It stops at the position where the connection path 13 is closed.

When the pressure acting on the large pressure receiving surface 5 increases, the spool 2 connects the combined pressure chamber 4 to the tank port 9 via the variable throttle 11, so the pressure in the control device 18 becomes low, and due to the decrease in pressure, the large pressure receiving surface 5 It stops when the force generated on the side is balanced with the force generated on the small pressure receiving surface 8 side. Further, when the pressure acting on the large pressure receiving surface 5 becomes low, the spool 2 moves to narrow the open variable throttle 11, increases the pressure in the combined pressure chamber 4, and stops when it balances with the force generated on the small pressure receiving surface 8 side. Further, when the pressure acting on the large pressure receiving surface 5 becomes low while the spool 2 is stopped at the position where the tank port 9 and the connection path 13 are closed, the combined pressure chamber 4 is closed to the connection path 13.
Since the spool 2 slides to connect to the combined pressure chamber 4, the pressure of the pressure source higher than the pressure of the combined pressure chamber 4 is introduced to the chamber 4 via the check valve 12,
The pressure in the chamber 4 increases and stops when it balances with the force on the small pressure receiving surface 8 side.

If the area of each small pressure receiving surface 8 is equal and the total is equal to the area of the large pressure receiving surface 5, a pressure corresponding to the average pressure acting on each small pressure receiving surface 8 will be obtained in the composite pressure chamber 4 when the spool 2 stops balancing. This allows the controller 18 to perform control operations in accordance with the average pressure of the plurality of pressure sources.

In this way, according to the present invention, the spool 2 has a large pressure receiving surface 5 on one end side and a plurality of small pressure receiving surfaces 8 on the other end side.
By sliding the spool 2, the variable throttle 1 is created by sliding the composite pressure chamber 4 facing the large pressure receiving surface 5.
1 to the tank port 9 or to the partial pressure chamber 7 via the check valve 12, it is possible to obtain a pressure in the combined pressure chamber 4 corresponding to the pressure acting on each partial pressure chamber 7. If this is applied to the case where the pressure of multiple pressure sources is combined and transmitted to the device, the total length of the transmission circuit can be shortened and it is economical, and only one circuit is required to be connected to the device 18. This has the effect of simplifying the flow path.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional example, FIG. 2 is a cutaway side view of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of a state of use. 1...Valve housing, 2...Spool, 3...Combined pressure port, 4...Combined pressure chamber, 5...Large pressure receiving surface, 6
...Partial pressure port, 7...Partial pressure chamber, 8...Small pressure receiving surface, 9...Tank port, 10...Flow path, 11...
...Variable throttle, 12...Check valve, 13...Connection path.

Claims (1)

[Scope of utility model registration request] A synthetic pressure chamber 4 in which a synthetic pressure port 3 is formed is formed at one end of a spool 2 that is slidably provided in the valve housing 1.
The large pressure receiving surface 5 faces the large pressure receiving surface 5, and a stepped portion is formed on the other end side of the spool 2, and each stepped portion faces the partial pressure chamber 7 in which the dividing pressure port 6 is formed and faces the large pressure receiving surface 5. A variable throttle 11 is provided in the intermediate part of the spool 2 to narrow the flow path 10 connecting the combined pressure chamber 4 and the tank port 9 by sliding the small pressure receiving surface 8. Check valve 1 that allows
A pressure combining valve connected to a partial pressure chamber 7 through a connecting path 13 with a pressure valve 2 interposed therebetween.