JPH02217672A - Poppet valve and manufacture of the same - Google Patents

Abstract

PURPOSE:To reduce the number of parts used and man-hours for assembly works and set the inter-valve element spacing with good precision by burn fitting each valve seat to the flow path inner walls of the body, forming a valve element in a single piece with rods to be inserted in each flow path, and inserting each rod fitted with valve element into the flow path. CONSTITUTION:Valve seats 29, 30, 37, 38 of rubber are burn fitted to the inner walls of flow paths 25, 26 provided in a body 21. Valve elements 32, 33, 40 and pistons 34, 41 are formed in a single piece construction with rods 31, 39 to be inserted in these flow paths 25, 26. The rod 31 fitted with the valve element 32 is pressure fitted into the flow path 25, while the other rod 39 with valve element 40 is pressure fitted into the flow path 26. Thus the number of parts used and man-hours for assembly works can be reduced. Also this enables accurate setting of inter-valve element spacing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a poppet valve used for controlling the transfer of various fluids and a method for manufacturing the poppet valve.

[Conventional technology]

Conventionally, as an example of a poppet valve, as shown in Fig. 2, three chambers, A%B and C1, are set in the main body 1, and one boat is provided in each chamber, and an A boat and a B boat are provided. A three-port type is known in which the communication between the B boat and the C boat is switched to the communication between the B boat and the C boat, and the communication between the B boat and the C boat is switched to the communication between the A boat and the B boat.

2 and 3 are valve seats installed opposite to each other in the main body 1, 4 is a cylinder chamber also provided in the body, 5 is a rod, 6 and 7
8 is a valve body fixed to the rod 5, 8 is a piston also fixed to the rod 5, 9 is a pressing spring, and the valve receives pressure from the pilot solenoid 0 to move the piston 8. 5 and valve bodies 6 and 7 to switch the flow paths as described above. two valve bodies 6, 7
The two valve seats 2 and 3 are sandwiched between each valve seat 2 and 3.
The outer diameter is set to be larger than the inner diameter of each valve seat 2, 3 so that the end face contacts the valve seats 2, 3. The body main body 1 and the valve bodies 6 and 7 are each formed of a rigid material such as metal, and the valve bodies 6 and 7 are provided with a sealing member 1 made of an elastic material to increase the sealing force when closed.
1.12 is included.

[Problem to be solved by the invention 1 The following problems are pointed out with respect to the above-mentioned conventional valve.

That is, the body main body 1 and the valve bodies 6 and 7 are both molded from a rigid material, and the outer diameter of the valve bodies 6 and 7 is the same as that of the valve seats 2 and 3.
Since the inner diameter is set larger than the inner diameter of the valve body 1, it is not possible to fix the valve bodies 2 and 3 to the rod 5 in advance when inserting the rod 5 into the main body 1 when assembling the valve. That is, if we insert the rod 5 from above the main body 1 in the figure, the rod 5 is
However, since the lower valve body 7 must pass through the inner diameter portions of the valve seats 2 and 3, it cannot be fixed to the rod 5 in advance. Therefore, the valve body 7 must be retrofitted to the rod 5 after the rod 5 is inserted into the body main body 1. Accordingly, the following demands have been made.

■Reducing the number of parts Within the range mentioned above, the above valve consists of the following eight parts (excluding the 10 parts of the pilot solenoid) 1. Body main body 1... Note 1 2. Rod 5... Note 2 3. Lower side valve body 7 4, pressing spring 9 5, upper valve body seal member 11 6, lower valve body seal member 12 7, seal member 13 such as an O-ring interposed between the rod 5 and the valve body 7. 8. Seal member 14 such as an O-ring fitted to the outer periphery of the piston 8 Note 1 - The valve seats 2 and 3 are integrated Note 2 - The upper valve body 6 and the piston 8 are integrally molded. be able to.

There is a desire to reduce the number of parts compared to the conventional technology which consists of eight parts.

■Reduction of assembly man-hours To assemble the eight parts mentioned above, a seven-step assembly process is required, and there is a desire to reduce the assembly man-hours.

■Ensuring dimensional accuracy In order to move the movable parts consisting of the piston 8, rod 5, and two valve bodies 6 and 7 and reliably switch the flow path, the spacing (distance) between the two valve bodies 6 and 7 must be set with high precision. However, according to the above-mentioned valve, since this interval is a composite of the dimensions of multiple parts, there is a large variation in the dimensions.In contrast, it is necessary to improve the dimensional accuracy of the interval. It is requested.

The present invention has been devised in view of the above points and for the purpose of meeting the above demands.

[Means for Solving the Problems 1] In order to achieve the above object, the manufacturing method according to the first aspect of the present invention includes baking a valve seat made of an elastic material and having a predetermined inner diameter dimension on the inner wall of the flow path of the body main body. , a valve element having an outer diameter larger than the inner diameter of the valve seat is integrally molded on a rod to be inserted into the flow path, and the rod with the valve element is pushed apart by the valve element to spread the valve seat. It is characterized in that it is inserted into the flow path so as to pass through the inner diameter side of the seat.

The manufacturing method according to the second aspect is characterized in that, in the first aspect, an outer wall portion of the valve body on the front side in the insertion direction is tapered in advance.

Further, the manufacturing method according to the third claim includes the first or second manufacturing method described above.
In the claim, a cylinder chamber is provided in the body main body,
The rod is provided with a piston, and at the same time as the valve seat is baked into the body, a sealing member made of an elastic material is baked into the inner wall of the cylinder chamber.

Further, in the manufacturing method according to the fourth aspect, in the first, second or third aspect, at the same time as baking the valve seat onto the body main body, a sealing member made of an elastic material is attached to an end wall portion of the body main body. It is characterized by burning.

Further, the valve according to a fifth aspect includes a main body provided with a flow path, two valve seats made of an elastic material and facing away from each other and baked into the inner wall of the flow path, and a rod inserted into the flow path. The present invention relates to a three-port type valve, characterized in that it has two valve bodies integrally molded with the rod and located outside the valve seat.

A valve according to a sixth aspect of the invention includes: a main body provided with a flow path; two valve seats made of an elastic material facing each other and baked into the inner wall of the flow path; and a rod inserted into the flow path. The present invention relates to a three-port type valve having a valve body integrally molded with the rod and located between the two valve seats.

A valve according to a seventh aspect of the invention is a four-port type valve characterized in that the structure of the fifth aspect and the structure of the sixth aspect are provided together.

[Function] In addition to the 3-port type shown in the above-mentioned prior art, poppet valves include a 2-port type (consisting of 1 valve seat and 1 valve body, which simply opens and closes the flow path) and 4 or more port valves. There is a type with a boat, and the manufacturing method according to the first to fourth aspects of the present invention can be applied to any of them.

Furthermore, as for the driving means for moving the movable members such as rods and valve bodies, various types such as mechanical and electromagnetic types can be considered in addition to those using air pressure from a combination of a cylinder and piston. The first claim is based on this point and constitutes the requirements without limiting the drive method, and includes a body main body,
Consists of 3 parts and 2 assembly steps: valve seat and rod with valve body. In the above conventional technology, the valve seat 2 corresponds to this.
．． It consists of 5 parts and 4 steps: the body 1 with 3, the rod 5, the valve body 7 and the two seal members 12 and 13, and the first
According to the manufacturing method according to the claims, the number of parts can be reduced by two and the number of assembly steps can be reduced by two steps. In the manufacturing method according to the second aspect, a guide taper is attached to the valve body to make it easier to push out the valve seat.

The third claim specifies the drive method of the movable member as a pressure type using a combination of a cylinder and piston, and is composed of five parts: a body body, a valve seat, a rod with a valve body, a piston, and a sealing member, and the number of assembly steps is reduced. Since we decided to bake the valve seat and seal member at the same time, there were three steps. In the above-mentioned conventional technology, seven parts and six steps correspond to this: the main body 1 with valve seats 2 and 3, the rod 5, the valve body 7, the piston 8, and three seal members 12, 13, and 14. According to the manufacturing method according to the third aspect, the number of parts can be reduced by two and the number of assembly steps can be reduced by three. The fourth claim takes into consideration the sealing performance when connecting the end cover to the body main body, and when citing the first claim, the four parts of the body main body, the valve seat, the rod with the valve body, and the sealing member.
It consists of several parts, and the number of assembly steps is two because the valve seat and sealing member are baked at the same time. In the above prior art, what corresponds to this is a main body 1 with valve seats 2 and 3. Rod 5, valve body 7 and three seal members 12.
According to this manufacturing method, the number of parts can be reduced by 2 and the number of assembly steps can be reduced by 3. In addition, when citing the third claim, it is made up of six parts: a body body, a valve seat, a rod with a valve body, a piston, and two seal members, and the assembly process involves baking the valve seat and two seal members at the same time. Since I decided to do this, there are 3 steps. In the above conventional technology, what corresponds to this is a body main body 1 with valve seats 2 and 3, a rod 5, and a valve body 7.
, piston 8 and four sealing members 12.13.14
．． According to this manufacturing method, the number of parts can be reduced by two and the number of assembly steps can be reduced by four steps. Note that the end cap may be integrally molded with the main body.

The valve of the fifth claim corresponds to the above-mentioned prior art and has two valve seats.
This is a two-valve type three-boat valve, and by implementing the above manufacturing method, the number of parts is reduced by two compared to the conventional technology.

The valve of claim 6 is a two-valve-seat, one-valve element type three-boat valve in which one valve element is disposed between two valve seats, and the number of parts is reduced by two compared to the prior art by implementing the above manufacturing method. has been reduced.

The valve according to the seventh aspect is a four-port type valve by combining the valves according to the fifth and sixth aspects.

〔Example] Next, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the main body 21 is made of synthetic resin.
is molded, and end caps 22 and 23 are connected to both end walls to form a body. The inside of the body is divided into four chambers, E, F, and G, and each chamber has one boat to set up a four-boat valve. The valve is pilot solenoid 2
In response to the supply and discharge of pressure from 4, communication between D and E boats and communication between F and G boats is switched to communication between D and F boats and communication between E and G boats, and communication between D and F boats is switched. and the communication between the E boat and the G boat, the communication between the D boat and the E boat, and the communication between the F boat and the G boat.
Switch to boat communication.

The body main body 21 is provided with a first flow path 25 that connects the D chamber, the F chamber, and the G chamber in series, and a second flow path 26 that connects the D chamber, the E chamber, and the G chamber in series, and the flow path 25. Set the valve to 3 baud every 26. In the G chamber, cylinder chambers 27 and 28 are formed for each of the flow passages 25 and 26.

First and second rubber valve seats 29 and 30 facing away from each other across the F chamber are baked onto the inner wall of the first flow path 25, and a rigid rod 31 is inserted into the flow path 25. to the first and second
The valve body 32, 33 and piston 34 are integrally molded. 1st
A taper 32a is attached to the valve body 32. A pressing spring 35 is interposed between the second valve seat 30 and the piston 34,
The first seal member 36 is baked onto the inner wall of the cylinder chamber 27 . The outer diameter of the first valve body 32 is set to be smaller than the inner diameter of the second valve seat 30 and larger than the inner diameter of the first valve seat 29, and the rod 31 with the valve body 32 is It is press-fitted into the flow path 25 from the left side.

Third and fourth rubber valve seats 37 and 38 facing each other with the E chamber in between are baked on the inner wall of the second flow path 26, and a rigid rod 39 inserted into the flow path 26 is attached to the third and fourth rubber valve seats 37, 38. 3 valve body 4
0 and the piston 41 are integrally molded. A taper 40a is attached to the valve body 40. A pressing spring 42 is interposed between the fourth valve seat 38 and the piston 41, and a second seal member 43 is baked onto the inner wall of the cylinder chamber 28. Third valve body 40
The outer diameter of the valve body 40 is set to be larger than the inner diameter of the third and fourth valve seats 37, 38, and the rod 39 with the valve body 40 is press-fitted into the flow path 26 from the left side in the figure. A third seal member 44 is baked onto the end wall portion of the main body 21. The first to fourth valve seats 29, 30, 37, 38 and the first to third valve seats 29, 30, 37, 38
It is assumed that the sealing members 36, 43, and 44 are grilled at the same time.

[Effects of the Invention] As explained above, according to the present invention, it is possible to reduce the number of parts and the number of assembly steps. Further, according to the present invention, since the movable member is integrated, the interval between the two valve bodies can be set with high accuracy.

FIG. 1 is a sectional view of a poppet valve according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional poppet valve.

End cover 25.26 flow path 29, 30.37.38 valve seat 32.33.40 Valve body 34.41 Piston 36, 43.44 seal member 21 body 22.23 2728 cylinder chamber 31.390 pounds 32a, 40a Theba 35.42 Pressing spring R, E, F, G boat

Claims (7)

[Claims] 1. A valve seat made of an elastic material having a predetermined inner diameter is baked onto the inner wall of the flow path of the body body, and a valve body having an outer diameter larger than the inner diameter of the valve seat is integrally molded onto a rod to be inserted into the flow path. A method for manufacturing a poppet valve, comprising inserting the rod with the valve body into the flow path so that the valve body pushes the valve seat apart and passes through the inner diameter side of the valve seat. . 2. 2. The method of manufacturing a poppet valve according to claim 1, wherein the outer wall portion of the valve body on the front side in the insertion direction is tapered in advance. 3. A cylinder chamber is provided in the body main body, a piston is provided in the rod, and a sealing member made of an elastic material is baked into the inner wall of the cylinder chamber at the same time as the valve seat is baked into the body main body. A method for manufacturing a poppet valve according to item 1 or 2. 4. Item 1, 2, or 3, characterized in that a sealing member made of an elastic material is baked into an end wall portion of the body main body at the same time as the valve seat is baked into the body main body.
The method for manufacturing the poppet valve described in section. 5. A main body provided with a flow path, two valve seats made of an elastic material facing away from each other and baked into the inner wall of the flow path, a rod inserted into the flow path, and a valve seat integrally molded with the rod. A 3-port poppet valve characterized by having two valve bodies located outside the valve seat. 6. A main body provided with a flow path, two valve seats made of an elastic material facing each other and baked into the inner wall of the flow path, a rod inserted into the flow path, and a valve seat integrally molded with the rod. A 3-port poppet valve characterized by having a valve body located between valve seats. 7. A 4-port poppet valve, characterized in that the structure of item 5 above and the structure of item 6 above are provided together.