JPH0361073B2 - - Google Patents

Description

Detailed Description of the Invention Technical Field The present invention relates to a main body having a supply port, two output ports, and two discharge ports, and two valve bodies disposed coaxially on the main body and connected to each other. This invention relates to a 5-port solenoid valve that has a switch and is controlled by an external pilot valve.

Prior Art and Problems As a five-port solenoid valve controlled by an external pilot valve, for example, a valve as shown in FIG. 2 is known.

In the conventional solenoid valve, two valve seats 51 and 52 are provided in the flow paths connecting the supply port P and the two output ports A and B, respectively, and the respective output ports A and B and the discharge ports R ₁ and R. _Two valve seats 5 provided in the flow paths connecting the two valves respectively.
One valve body 56 is housed in a main body 55 having a valve body 55 having a valve body 3 and 54. In the first switching position of the valve element 56, the first valve part 57 is in contact with the valve seat 51, and the fourth valve part 60 is in contact with the valve seat 5.
4, the second valve part 58 and the third valve part 59 are separated from the valve seat, and the second valve part 58 is in the second switching position.
is seated on the valve seat 52, the third valve part 59 is seated on the valve seat 53, and the first valve part 57 and the fourth valve part 60 are separated from the valve seat. The spacing between each valve part and the spacing between each valve seat are related to processing accuracy, and dimensional errors cannot be avoided. Therefore, unless the position of either the valve seat or the valve part is made adjustable, the two valve parts will not be able to accurately seat on each valve seat at each switching position, and the position of either valve part and the valve seat will not be adjusted. There will be a gap between them. In order to solve this problem, it is known that the valve seats 53 and 54 are screwed onto the main body as shown in FIG. In this case, positioning the valve seat is a complicated and time-consuming task, and it is not always possible to adjust the valve seat to ensure accurate seating.

Means for Solving the Problems The present invention solves the above problems by configuring the valve body by two separate valve bodies disposed coaxially and facing each other, each valve body having a first valve part and a second valve part, respectively. and a piston part, the first valve part is seated on a supply valve seat provided in a flow path connecting the supply port and the output port, and the second valve part is seated in a flow path connecting the output port and the discharge port. The piston is formed to be seated in a direction opposite to the first valve portion on a discharge valve seat provided in a passageway, the cylindrical inner wall of the drive piston slides around the piston, and the cylinder chamber of the main body slides around the drive piston. The first valve part, second valve part, and piston part of each valve body receive pressure in the direction of closing the supply valve seat when seated, the pressure receiving area A ₂ of the valve part, the pressure receiving area A ₁ of the other valve part, and the piston. The pressure receiving area A ₀ of the drive piston and the pressure receiving area A ₃ of the drive piston are set to have a difference in area from each other so that A ₁ <A ₀ <A ₂ <A ₃ , and the two valve bodies are connected to each other by a connecting rod. The distance between the valve parts of both valve bodies to be seated at the same time is maintained at a distance smaller than the distance between the valve seats to be seated by one or two stop members attached to approximately the center of the connecting rod. The valve bodies are formed so as to be movable relative to the connecting rod up to a distance at which the corresponding valve seats can be attached and removed together, and the outputs of the two normally open pilot valves are connected to the cylinder chamber outside the piston portion of each valve body. The problem was solved by a 5-port solenoid valve that is characterized by:

Effects According to the present invention, two valve bodies are disposed coaxially and facing each other in opposite directions, and include a first valve portion seated on a supply valve seat, a second valve seat seated on a discharge valve seat, and a piston portion. the supply fluid pressure acts on the first valve seat,
Since the output of the pilot valve acts on the piston portion from the side opposite to the supply fluid pressure, both valve bodies are moved individually in accordance with the difference in applied pressure. In order to create a pressure difference between the pressure acting on the valve body from both sides, the pressure receiving area A ₁ of the first valve part, the pressure receiving area A ₂ of the second valve part, and the pressure receiving area A ₀ of the piston part during sealing are determined. The pressure receiving area A ₃ of the piston is set to a value that satisfies the relationship A ₁ <A ₀ <A ₂ <A ₃ . Two valve bodies are connected by a connecting rod, and a stop member attached to the connecting rod keeps both valve bodies at a constant interval, that is, the distance between the seating surfaces of the valve parts where both valve bodies are to be seated simultaneously on their respective valve seats. can be maintained at a spacing smaller than the valve seat surface spacing,
However, since both valve bodies are configured to be movable relative to the connecting rod, by switching the pilot valve, the pilot fluid acts on the driving piston and piston portion related to one valve body, and acts on the driving piston and piston portion related to the other valve body. When the pilot fluid acting on the drive piston is discharged, the other valve body is moved by the pressure difference acting on the first valve part and the piston part, and the second valve part is seated on the discharge valve seat. At this time, the one valve body and the connecting rod are moved in one direction by the driving piston receiving the pilot fluid pressure, and the first valve portion of this valve body is seated on the supply valve seat. When the second valve portion of the other valve body is seated on the discharge valve seat, the stop member of the connecting rod comes into contact and the drive piston stops. Since the one valve element is movable relative to the connecting rod by the pilot fluid pressure acting on the piston part, the first valve element of the other valve element is seated at the same time or immediately after the second valve element of one valve element is seated. The valve portion seats on the supply valve seat.

According to the present invention, the two valve bodies can be reliably seated without being affected by machining accuracy.

Embodiments The structure and operation of the present invention will be explained in detail with reference to embodiments shown in the drawings.

In FIG. 1, a valve chamber 2 is formed in a main body 1, and the valve chamber 2 has two valve bodies, a first valve body 3a and a second valve body 3b coaxially arranged in opposite directions. They are placed opposite each other. The main body 1 is formed with a supply port P, two output ports, namely a first output port A and a second output port B, and two discharge ports, namely a first discharge port _R1 and a second discharge port _R2. The flow path connecting the supply port P and the first output port A has a first
A second valve seat 5 is formed as a supply valve seat in the flow path where the valve seat 4 connects the supply port P and the second output port B, and a second valve seat 5 is formed as a supply valve seat in the flow path that connects the first output port A and the first output port _R1 . A third valve seat 6 is formed as a discharge valve, and a fourth valve seat 7 is formed as a discharge valve in the flow path connecting the second output port B and the second discharge port _R2 .

The first valve body 3a has a first valve part 8a, a second valve part 9a, and a piston part 10a, and the second valve body 3b has a first valve part 8a, a second valve part 9a, and a piston part 10a.
It has a valve part 8b, a second valve part 9b, and a piston part 10b. The first valve part 8a of the first valve body 3a is formed to be seated on the first valve seat 4, and the second valve part 9a is formed to be seated on the third valve seat 6 from the opposite direction to the first valve part 8a,
The arrangement is such that when either the first valve part 8a or the second valve part 9a is seated on the valve seat, the other valve part is away from the valve seat. Similarly, the second valve body 3b
The first valve part 8b is seated on the second valve seat 5, the second valve part 9b is formed to be seated on the fourth valve seat 7 from the opposite direction to the first valve part 8b, and the first valve part 8b is seated on the second valve seat 5. The arrangement relationship is set such that when either one of the first valve portion and the second valve portion 9b is seated on the valve seat, the other is away from the valve seat. Both valve bodies 3a and 3b are connected by a connecting rod 17. The connecting rod 17 passes through both valve bodies 3a and 3b,
a stop member 18 formed approximately in the center of the connecting rod 17;
For example, the distance between the valve bodies 3a and 3b is maintained at a predetermined length by a flange formed integrally with the connecting rod 17 or by a retaining ring or nut attached to the connecting rod 17. That is, the stop member 18 makes the distance between the valve parts 8a and 9b of both valve bodies seated at the same time smaller than the distance between the valve seats 4 and 7, and the distance between the valve parts 8b and 9a from the valve seat 5.
The valve bodies 3a and 3b can be held at a distance from the connecting rod at a relative position slightly smaller than the distance between the valve bodies 3a and 6. After one valve body 3a or 3b is seated on the valve seat, both valve bodies 3a and 3b are supported by the connecting rod so that they can move relative to the connecting rod until the other valve body is seated on the valve seat. There is. As a result, both the valve bodies 3a and 3b can be freely attached to and detached from the connecting rod 17 from both end sides.

Two cylinder chambers 11 and 12 are formed in the main body 1, and a first driving piston 13a is slidably guided in the first cylinder chamber 11, and a second driving piston 13b is slidably guided in the second cylinder chamber 12. The piston portion 10a of the first valve body 3a is slidingly guided on the cylindrical inner wall 14 of the first driving piston 13a, and the piston portion 10b of the second valve body 3b is slidingly guided on the cylindrical inner wall 14 of the second driving piston 13b. be done.

A pilot supply port PP is formed in the main body 1 at a portion where the supply port P of the valve chamber 2 is open.
The first cylinder chamber 11 includes a first driving piston 1
A first pilot port PA ₁ is formed outside the piston portion 3a, and a second pilot port PA ₂ is similarly formed in the second cylinder chamber 12 outside the piston portion 10b. Pilot supply port PP is flow path 1
4 is connected to the input ports of the first normally open pilot valve 15 and the second normally open pilot valve 16. 1st
The outlet port of the pilot valve 15 is connected to the first pilot port PA ₁ of the first cylinder chamber 11,
The outlet port of the second pilot valve 16 is connected to the second pilot port PA ₂ of the second cylinder chamber 12.

The first valve portion 8a or 8 of the first and second valve body 3
b and the second valve part 9a or 9b are valve parts that receive the supply valve seats 4 and 5 in the closing direction during sealing, and in _FIG . In the figure, the pressure receiving area of the first valve parts 8a and 8b
A ₁ and the pressure receiving area of the piston A ₀ and the driving piston 1
The pressure receiving area A ₃ of 3a and 13b is A ₁ <A ₀ <A ₂ <A ₃
There is a difference in area from each other so that As a result, the first valve body 3a and the second valve body 3b are pushed and moved by the pressing force of the drive piston 13a or 13b, and when both drive pistons receive pilot fluid pressure, they come to rest due to the balance of forces and are held at that position. be done.

When the first pilot valve 15 is ON and the second pilot valve 16 is OFF, the first pilot port
Since PA ₂ is in the discharge state, the first cylinder chamber 1
The first driving piston 13a and the first valve body 3 communicate with the fluid in the first cylinder chamber 11 via a through passage 19 provided in the first driving piston 13a.
The fluid in the space 20 between the piston part 10a and the piston part 8a is discharged, and the fluid pressure acting on the first valve part 8a starts to move to the left in the figure, and at the same time, the fluid pressure in the second cylinder chamber 12 causes the first valve part 8a to move to the left. Piston 1 of body 3b
0b is pushed by the second driving piston 13b, and the second valve body 3b is pushed to the left in the figure toward the first valve body 3a. At this time, the second valve part 9a of the first valve body 3a is seated on the third valve seat 6, and the second valve part 9a of the first valve body 3a is seated on the third valve seat 6 at the same time or a little later.
The second valve body 3b, which is pushed in direct contact with the driving piston 13b, is seated on the second valve seat 5. Further, the stop portion 18 of the connecting rod 17, which is pushed in direct contact with the second driving piston 13b, stops with a gap between the first valve body 3a and the first valve body 3a. After switching, the end of the connecting rod 17 is in contact with the first drive piston 13a, and a slight gap is formed between the first drive piston 13a and the piston portion 10a of the first valve body 3a. First valve body 3a
is movable relative to the connecting rod 17 by the distance between the stop member 18 and the first driving piston 13a. At the time of this switching, the first valve seat 4 is opened and the third valve seat 6 is closed, so fluid is supplied from the first port A, and the second output port B is communicated with the second discharge port R ₂ to be in the discharge state. become. When the first pilot valve 15 is OFF, the second pilot valve 16 is
When ON, the first pilot port _PA2 receives the pressure of the pilot fluid, and the second pilot port PA2 receives the pressure of the pilot fluid.
Since PA ₂ is in the discharge state, contrary to the above, the second valve body 3b moves to the right in the figure due to the pressure difference between both ends, and at this time, the first valve body 3a is pushed by the first driving piston 13a and the first valve body 3a moves to the right in the figure. Move to the right. At this time, the second valve body 3
The second valve part 9b of the first valve body 3a is seated on the fourth valve seat 7, and at the same time or immediately after that, the first valve part 8a of the first valve body 3a is seated on the fourth valve seat 7.
It will be in a state where it is seated on the valve seat 4. The second valve body 3b is also movable relative to the connecting rod 17 by the gap between it and the second drive piston 13b and the gap between it and the stop member 18, similarly to the first valve body. When both pilot valves 15 and 16 are OFF, both driving pistons 13
Since the valve bodies 3a and 13b press against each other and the forces are balanced, both the valve bodies 3a and 3b do not move and are held at their positions.

In the example shown in FIG. 1, the first valve part 8a is seated on the first valve seat 4 from the right side of the figure, and the first valve part 8b is seated on the second valve seat 5.
, the second valve part 9a is seated on the third valve seat 6 from the left side in the figure, and the second valve part 8b is seated on the fourth valve seat 7 from the right side in the figure. is also possible.

Effects The present invention provides a poppet electromagnetic valve that can reliably seat a plurality of valve bodies connected to each other by a connecting rod almost simultaneously on their respective valve seats of the main body, even if a valve body and a main body with low machining accuracy are used. A valve was obtained.

The availability of such poppet valves has the advantage of spool valves in that multiple valve discs can be seated on the valve seat at the same time and held in that position, yet is free from dust and deterioration. A poppet valve has been obtained which can avoid the drawbacks of spool valves such as sticking or abrasion due to the presence of oil and the like.

According to the present invention, it is possible to obtain a valve that can be seated almost simultaneously on the valve seat by using two poppet valve bodies of the same shape, even for main bodies with slightly different valve seat spacing. Productivity has been improved because the machining accuracy of the body and main body is not an issue.

According to the present invention, it has become possible to reliably hold the switching position without requiring any special means due to the difference in pressure receiving area between each valve part and the piston part of the valve body.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a 5-port solenoid valve according to the present invention, and FIG. 2 is a sectional view of a conventional 5-port solenoid valve. 1... Main body, 3a, 3b... Valve body, 4, 5...
Supply valve seat, 6, 7...Discharge valve seat, 8a, 8b...
First valve part, 9a, 9b... Second valve part, 10a, 1
0b... Piston part, 11... First cylinder chamber, 12... Second cylinder chamber, 13a... First
Drive piston, 13b...Second drive piston, 1
4... Cylindrical inner wall, 15, 16... Pilot valve,
17... Connecting rod, 18... Stopping member.

Claims (1)

[Claims] 1. A 5-port solenoid valve including a main body having a supply port, two output ports, and two discharge ports, a valve body capable of reciprocating within the main body, and a pilot valve connected to the main body. In the above, two separate valve bodies are arranged coaxially and facing each other in opposite directions.
Each valve body has a first valve part, a second valve part, and a piston part, and the first valve part is connected to a supply port provided in a flow path connecting a supply port and an output port. The second valve portion is formed to sit in a direction opposite to the first valve portion on a discharge valve seat provided in a flow path connecting an output port and a discharge port;
The piston part is slidably guided by the driving piston and the cylindrical inner wall, the driving piston is slidably guided by the cylinder chamber of the main body, and the first valve part and the second valve part of each valve body and the piston part are connected to a seat supply valve. The pressure receiving area _A2 of the valve part in the direction of closing the seat, the pressure receiving area _A1 of the other valve part, _{the pressure receiving area A0 of the piston part, and the pressure receiving area A3 of the drive piston are A1 < A 0 < A 2 <} A ₃ , the two valve bodies are connected to each other by a connecting rod that is moved by the driving piston, and one or two stop members are installed approximately in the center of the connecting rod. The distance between the valve parts of both valve bodies that should be seated at the same time is maintained at a smaller interval than the gap between the valve seats that should be seated, and both valve bodies are moved relative to the connecting rod until the relative distance that the corresponding valve seats are seated together. 5-port solenoid valve, characterized in that the outputs of the two normally open pilot valves act on the driving piston and piston portion of one valve body from the outside, respectively.