JPS59200872A - Flow distributing and collecting valve - Google Patents

Abstract

PURPOSE:To change the ratio of flow distribution and collection easily by a method wherein a choking means, provided in a flow path connecting liquid pressure chambers to ports, is arranged in a housing. CONSTITUTION:The housing 2 is provided with one set of first port 8, two sets of second ports 10, 11 and a spool chamber 12. A spool 14 is fitted slidably into the spool chamber 12. The housing 2 is also provided with liquid paths 28, 30, connecting the port 8 to two sets of liquid pressure chambers 24, 26. The variable choke valves 32, 34 are arranged in the paths. According to this method, it is enough to change only the choking means independently of the spool in case necessity to change the ratio of flow distribution and collection of the flow collecting valve is caused.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow dividing/collecting valve. The dividing/collecting valve is a dividing valve that distributes the liquid supplied through one liquid passage to two liquid passages at a fixed ratio by its action;
It is divided into a flow collection valve that merges the liquid supplied from two liquid passages into one liquid passage at a fixed ratio, and a separation flow collection valve that serves both purposes, but in principle they are the same. It is.

The dividing/collecting valve is composed of a housing, a spool, and a conventional throttle means. Howsink is one first bow),
2 (equipped with tlil's second bow 1~ and spool chamber,
A spool is disposed in the spool chamber so as to be slidable in the axial direction, dividing the spool chamber into a first hydraulic pressure chamber and a second hydraulic pressure chamber,
The pressure receiving surfaces facing opposite to each other receive the hydraulic pressure of both hydraulic pressure chambers. The spool is secretly held in a neutral position by a spring, but when a difference in hydraulic pressure occurs between the two hydraulic pressure chambers, the spool moves to the hydraulic pressure chamber with lower hydraulic pressure and connects both hydraulic chambers and the two hydraulic pressure chambers. The function is to change the flow area of the liquid passage connecting the two boats so that the liquid pressure in both hydraulic pressure chambers becomes equal. In addition, each of the two liquid passages in both the hydraulic pressure chambers and the first boat is provided with throttling means that applies a predetermined resistance to the liquid flowing through those liquid passages. The pressure on the first boat side of these two throttling means is common, and the hydraulic pressure on the side of the two hydraulic pressure chambers is kept equal by the action of the spool, so these two throttling means The flow rate of liquid passing through is maintained at a constant ratio determined by the ratio of the flow path areas of the two restricting means.

2. Conventionally, the two throttling means were provided on the spool and moved together with the spool.

Therefore, if it becomes necessary to change the ratio of split flow to the two liquid passages or the ratio of flow collection from the two liquid passages, it is necessary to replace the throttling means with the spool or replace the dividing/collection valve itself. Met.

The present invention has realized that the above-mentioned drawbacks are due to the fact that in the conventional separating/collecting valve, the throttling means is provided on the spool and moved together with the spool, and the present invention has been developed by removing the throttling means from the spool. It is designed to be separated and installed in the housing.

In this way, if it becomes necessary to change the flow rate, the flow concentration ratio of the flow collection valve, or the flow collection ratio, it is better to change only the throttling means, which has nothing to do with the spool. For example, 2 (11i1
If the throttling means is constituted by fixed orifice parts +4 removably provided in each of the liquid passages in the housing, the distribution/concentration ratio can be easily changed by replacing the fixed orifice members. In addition, since the throttling means does not move together with the spool, it can be made into a variable throttling valve.In this way, the deviation can be easily changed by adjusting the min/flow collection ratio. is iM
It will be done.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the drawings.

Figures 1 and 2 are diagrams showing a flow dividing/collecting valve that can perform both a flow dividing function and a flow collecting function. Indicates that it is functioning as a valve.

In FIG. 1, reference numeral 2 denotes a housing, which consists of one housing body 4 and two auxiliary members 6. The housing 2 includes one first boat 8, two second boats 10.
11 and a spool chamber 12. Spool chamber 1
A spool 14 is slidably fitted into 2. This spool I4 consists of a first member 16 and a second member 18 which are engaged in an axially removable manner by a distance d, both members 16, 18 being supported by a compression coil spring 20, 22.22, they are kept approximately half the distance d apart.

The spool 14 is fitted into the spool chamber 12, thereby dividing the spool chamber 12 into a first hydraulic pressure chamber 24 and a second hydraulic pressure chamber 26.
Receives hydraulic pressure of 4,26.

Liquid passages 28 and 30 are provided in the housing 2 to connect the first boat 8 and the two hydraulic chambers 24 and 26. These liquid passages 28, 30 are formed across the housing main body 4 and the auxiliary member 6, and variable throttle valves 32 and 34 are provided in the portions formed in the auxiliary member 6, respectively.
is provided. Each variable throttle" valve is equipped with a valve element 36 screwed to the auxiliary member 6, and a tapered shaft part 38 provided at the tip of the valve element is connected to a throttle hole 40 provided in the middle of the liquid passage 28 or 30. It is being inserted into.

By screwing the valve element 36 forward or backward, the area of the annular gap formed between the opening periphery of the throttle hole 40 and the outer peripheral surface of the tapered shaft portion 38 changes. .

The first hydraulic pressure chamber 24 and the second hydraulic pressure chamber 26 are formed by a plurality of holes 42 formed radially in the first member 16 and second member 18 of the spool 14, and in the inner peripheral surface of the spool chamber 12. The second boats 10 and 11 are connected to the second boats 10 and 11 by liquid passages formed by annular grooves 44 and annular grooves 44, respectively. Hole 4
The opening of the second annular groove 44 is entirely positioned within the annular groove 44 when the spool 14 is in the neutral position. When the opening of the hole 420 is moved to the side of It is designed to be reduced.

The space 46 between the first member 16 and the second member 18 of the spool 14 is communicated with the first boat 8 through a communication passage 48, so that the hydraulic pressure in the space 46 is always the same as the hydraulic pressure in the first boat 8. It is designed to become.

The diverting/collecting valve configured as described above functions as a diverting valve when the pressure on the first boat 8 side is high and the pressure on the second boat 10, 11 side is low. That is, the liquid flowing in from the first boat 8 is partially divided and reaches the hydraulic pressure chambers 24 and 26 through the liquid passages 28 and 30, and flows out from the second boats 10 and 11 to the outside.

Now, suppose that the flow path areas of the two variable throttle valves 32 and 34 are adjusted to be the same, and the two second bows) 10
and 11 are equal, then spool 1
4 will not move from the neutral position shown in FIG. 1, and the same amount of liquid will be discharged from the two second bows 0 and 11. However, when a difference occurs between the hydraulic pressures in the two second boats 1-10.11, for example, when the hydraulic pressure in the second boat 10 becomes higher than the hydraulic pressure in the second boat 11, the first hydraulic pressure 24 also becomes higher than the hydraulic pressure in the second hydraulic pressure chamber 26, and the spool 14 is moved to the second hydraulic pressure chamber 26 side where the hydraulic pressure is lower. Due to this movement, a part of the opening 1 of the hole 42 of the second member 18 comes out of the annular groove 44, and the hydraulic pressure chamber 2
6 and the bow 1-11, the flow area of the liquid passage is reduced, and a throttling effect occurs here, whereby the hydraulic pressure chamber 2
6 hydraulic pressure will be increased. On the other hand, on the first member 16 side, the opening of the hole 42 has an annular shape 11'l as a whole.
'i 44, so the hydraulic pressure chamber 2
The flow area of the liquid passage connecting 4 and 10 remains unchanged, and no throttling effect occurs. Second hydraulic chamber 26 of spool 14
The movement to the side is continued until the hydraulic pressures in the hydraulic pressure chamber 24 and the second hydraulic chamber 26 become equal, and when the hydraulic pressures in both hydraulic pressure chambers reach equal f, the spool 14 stops. do.

That is, the spool 14 has two second boats 10 and 11.
The first hydraulic pressure chamber 24 and the second hydraulic pressure chamber 2
Both hydraulic pressure chambers 24, 26 are kept equal in hydraulic pressure with 6.
and boat 10. '11 and has the effect of changing the flow area of the liquid passage. If the hydraulic pressures in the first hydraulic pressure chamber 24 and the second hydraulic pressure chamber 26 are kept equal in this way, the hydraulic pressure difference before and after the variable throttle valves 32 and 34 is kept equal. Since the flow path areas of these variable throttle valves are made equal as described above, the flow rates of the liquid passing through these variable throttle valves are also kept equal. That is, the two second boats 1'0
Even if there is a hydraulic pressure difference between I-10 and 11, the liquid supplied from the first boat 8 is distributed to the second boats I-10 and 11 in half.

In addition, when it is desired to change the distribution ratio between the two second boats 10 and 11, the throttle valve 32 is rotated by rotating the valve 36.
What is necessary is to change the flow path area of and 34. For example, when it is desired to reduce the distribution amount to the second boat 10, the flow path area of the variable throttle valve 32 is decreased, while the flow path area of the variable throttle valve 34 is increased. In this way, two variable throttle valves 3
Even if the flow path areas of variable throttle valve 2 and 34 are changed, there is no change in the function of spool 14 to maintain the same hydraulic pressure in first hydraulic pressure chamber 24 and second hydraulic pressure chamber 26. and 34
The difference in fluid pressure before and after the flow is kept equal, and the flow rate flowing to the variable throttle valve 32 side, which has a small flow path area, decreases, and the flow rate flowing to the variable throttle valve 34 side increases. From the above explanation, it can be seen from the above explanation that the once set separation rate of the two second boats 1 to 10 and 11 is maintained at a certain level regardless of the fluctuation of the hydraulic pressure in these boats. it is obvious.

Next, an explanation will be given of the operation when the flow dividing valve of this embodiment functions as a flow collecting valve. It functions as a flow collecting valve when the hydraulic pressure of the second boats 10 and 11 becomes higher than the hydraulic pressure of the first boat 8. In this case, the first member 16 and the second member 18 of the spool 14 and are closest to each other as shown in FIG. This is because the hydraulic pressure between the first hydraulic chamber 24 and the second hydraulic chamber 26 becomes higher than the hydraulic pressure of the first boat 8, that is, the hydraulic pressure of the space 46, by the hydraulic pressure difference between the variable throttle valves 32 and 34. be.

Even when functioning as a flow collecting valve, the spool I4 functions to maintain the same hydraulic pressure in the first hydraulic pressure chamber 24 and the second hydraulic pressure chamber 26, regardless of the hydraulic pressure difference between the second bows 11O and 11. Therefore, the difference in hydraulic pressure before and after the variable throttle valves 32 and 34 is kept equal.

For example, if the fluid pressures at the second balls l-10 and 11 of 2 + 1 lil are equal, and the fluid pressure of 10 increases from the state where the spool 14 is stopped at the neutral position shown in FIG. 2 to the second ball 1, Then, the hydraulic pressure in the first hydraulic pressure chamber 24 increases accordingly, and the spool I4 is moved toward the second hydraulic pressure chamber 26 side. With this movement, a part of the opening of the hole 42 of the first member 16 comes off from the annular groove 44, and the flow area of the liquid passage connecting the second boat 10 and the first hydraulic pressure chamber 24 is reduced. The fluid pressure in the first fluid pressure chamber 24 decreases due to its throttling effect.

On the other hand, in the second member 18, the opening of the hole 42 does not deviate from the annular groove 44, so the flow path area remains unchanged and no throttling effect occurs. Eventually, the spool 14 moves to a position where the hydraulic pressures in the first hydraulic pressure chamber 24 and the second hydraulic pressure chamber 26 become equal, and comes to rest. If the hydraulic pressure with the hydraulic chamber 26 is maintained equal, the hydraulic pressure difference before and after the variable throttle valves 32 and 34 is also maintained equal, and the variable throttle valve 32 is maintained even though the hydraulic pressure fluctuates between the second boats 10 and 11. The flow rate of liquid passing through and 34, that is, the flow rate of liquid passing through bows 1 to 10 and 11, will be maintained at the same ratio as before the hydraulic pressure difference occurred.

If the throttling means for the liquid passages 28 and 30 are both variable throttling valves as in this embodiment, when the flow passage area of one throttling means is decreased, the flow passage area of the other throttling means is increased. Therefore, it is possible to avoid an increase in the hydraulic pressure loss of the flow dividing valve as a whole, which is unavoidable when the total area of the flow passages decreases. However, if such an increase in hydraulic pressure loss is acceptable, it is also possible to replace one of the restricting means with a fixed orifice member 50 shown in FIG. 3. This orifice member 50 has a small and simple shape with a through hole formed in the center of a disc, and the O ring 52
It is housed in a counterbore for mounting. The fixed orifice member 50 is accommodated in a somewhat movable state, but due to the pressure difference created before and after the fixed orifice member 50, it comes into close contact with either the auxiliary member 6 or the housing body 4, and is not connected to those surfaces. Fixed orifice member 5
To prevent liquid from leaking from a gap between 0 and 0 to such an extent that there is no practical problem.

Since the fixed orifice member 50 is simply fitted into the counterbore as described above, it can be easily replaced with another fixed orifice member by removing the auxiliary member 6 from the housing body 4. therefore,
A fixed orifice member 50 is used not only on the liquid passage 28 side but also as a restricting means on the liquid passage 30 side, and when it becomes necessary to change the flow separation ratio, one or both fixed orifice members 50 can be replaced. It is also possible to deal with this by

Further, the variable throttle valve is not limited to that of the embodiment described above. For example, as shown in FIG. 4, the variable throttle valve 56-
By using , it becomes possible to change the split/concentrate ratio in stages.

Yet another embodiment is shown in FIG. In this example, the first
This corresponds to the embodiment shown in FIG. 2 and FIG. 2, in which the variable throttle valves 32 and 34 are replaced with a single rotary variable throttle valve 60. The throttle valve 60 is provided at a branch point between the liquid passages 2B and 3o communicating with the first hydraulic pressure chamber 24 and the second hydraulic pressure chamber 26 and the liquid passage 62 communicating with the first boat 8.

That is, the sleeve 64 is press-fitted into the circular hole formed in the housing main body 4 at this branch part, and the sleeve 64
A valve element 66 is rotatably fitted therein. Portions of the sleeve 64 corresponding to the liquid passages 28, 30 and 62 and the space 46 are provided with holes 6B, 70 and 72, respectively.
．． 74 is formed. In the neutral position, the valve element 66 makes the opening areas of the holes 68 and 70 equal, but when it is rotated in either the forward or reverse direction from the neutral position, the opening area of one of the holes is reduced and The shape is such that the opening area of the other hole is increased by that amount.

Furthermore, a communication hole 76 is formed in the valve element 66 so that the space 46 can be communicated with the liquid passage 62 no matter which position the valve element is rotated. Since other parts are the same as those in the embodiment shown in FIGS. 1 and 2, the same parts are given the same reference numerals to indicate correspondence, and detailed explanation will be omitted.

According to this embodiment, by rotating one rotary type variable throttle valve 60, two liquid passages 28 and 30 are opened.
The flow area of both liquid passages can be changed at the same time, and the total flow area of both liquid passages can be kept equal. Therefore, the dividing/collecting ratio of the dividing/collecting valve can be changed to a desired value more easily.

Note that the interlocking variable throttle valve that simultaneously changes the flow area of the two liquid passages 28 and 30 is not limited to the Rochley type, and it is also possible to adopt one in which one valve element is moved in the axial direction.

Above, an embodiment in which the present invention is applied to a flow dividing and collecting valve capable of performing both a flow dividing action and a flow collecting action has been described in detail. For example, in the positional relationship shown in FIG. If the first member 16 and the second member 18 are fixed in the relative positional relationship shown in FIG. 2 to form an integrated spool, it becomes a flow diverter valve that can perform only a flow diversion function. If so, it becomes a flow collecting valve that performs only a flow collecting function. Therefore, it is needless to say that the present invention can be applied to the dividing valve and the collecting valve in exactly the same way.

In addition to the above, without departing from the spirit of the present invention,
It goes without saying that the present invention can be practiced with various modifications and improvements based on the knowledge of those skilled in the art.

[Brief explanation of drawings]

FIGS. 1 and 2 are front sectional views showing the state in which a flow dividing and collecting valve according to an embodiment of the present invention performs a flow dividing function and a flow collecting function, respectively. FIGS. 3 and 4 are front views showing a portion of a flow dividing/collecting valve, which is another embodiment of the present invention, in cross section. FIG. 5 is a front sectional view of a flow dividing/collecting valve which is still another embodiment of the present invention. 2: Housing 8: First bow 1-10.1
1: Second bow 1-12 Varnish spool chamber 14 Varnish spool 22: Compression coil spring 24: First hydraulic pressure chamber 26: Second hydraulic pressure chamber 28.3
0, 62: Liquid passage 32. 34, 56: Variable throttle valve 42: Hole 44: Annular groove 50: Fixed orifice member 54: Valve
6o: Rotary variable diaphragm Applicant: Technol Co., Ltd.

Claims (1)

[Scope of Claims] A housing comprising a second boat of 2 fll and a spool chamber; It is divided into a pressure chamber and a second hydraulic pressure chamber, and receives the hydraulic pressure of both hydraulic pressure chambers on pressure receiving surfaces facing opposite to each other, and is normally held in a neutral position by a spring, but when pressure is applied to both hydraulic pressure chambers. When a difference occurs, move to the example of the hydraulic pressure chamber with the lower hydraulic pressure, and change the flow area of the liquid passage connecting the two hydraulic pressure chambers and the second boat of the 2FLL& to the hydraulic pressure chamber of the two hydraulic pressure chambers. a spool that changes the spool to be equal; and a restricting means that applies a predetermined resistance to the liquid flowing through the two liquid passages connecting the two liquid pressure chambers and the first boat, When the liquid flows to the second boat of or in the opposite direction, the flow rate in the two second boats is kept at a constant ratio regardless of the fluctuation of the liquid pressure in the two second boats. A flow collector valve, characterized in that the two throttle means are provided not on the spool but on the housing. (2) The dividing/collecting valve according to claim 1, wherein the two throttling means are fixed orifice members each of which is independently replaceable in the liquid passage in the housing. (3) The dividing/collecting valve according to claim 1, wherein at least one of the two throttle means is a variable throttle valve. (4) The two throttle means are provided at a branching point between one liquid passage communicating with the first boat and two liquid passages communicating with the first and second hydraulic pressure chambers, and are movable. an interlocking type variable throttle which is provided with a single valve element and increases the flow area of one of the two flow passages communicating with the two hydraulic pressure chambers and decreases the flow passage area of the other by moving the valve element; 2. The separating/collecting valve according to claim 1, which is a valve.