JP2832575B2 - Gate valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an isolation valve, more specifically, to a valve device which is inserted into a fluid circuit and exhibits a check function. The present invention relates to a so-called self-operated valve that can open a downstream circuit to the atmosphere through the valve device when the pressure becomes low.

[0002]

2. Description of the Related Art As an on-off valve of the above-mentioned type, there is one disclosed in Japanese Patent Publication No. 3-43506, which includes two check valves (1a) and (1b) as shown in FIG. And a responsive valve connected to the diaphragm (D). The check valves (1a) and (1b) are separately provided at the inlet (31) to the valve chamber (30) provided in the valve box (3) and at the outlet (32). (31), the backflow from the downstream side to the upstream side at the outlet (32) is prevented.

The bottom wall of the valve chamber (30) has an intake port (33).
Is provided, and a response valve corresponds to this. This response valve is provided with a valve body (2) at the lower end of a hollow shaft (21) connected to a diaphragm (D), which is in contact with the intake port (33). The interior of the hollow shaft (21) communicates with the atmosphere through the intake port (33), and the base end of the hollow shaft (21) is located near the diaphragm (D). ) Communicates with the inside of the independent vacant room (34).

The primary vacant space (35) of the diaphragm (D) communicates with the upstream side of the inlet (31), and the secondary side of the diaphragm (D) serves as a valve chamber (30). And the hollow shaft (21)
A valve portion (22) is formed at the base end of the vacant space (3).
It is in contact with the open end of 4). In the above-described conventional device, normally, the gas flows from the upstream side to the downstream side along the route of the inlet (31) → the valve chamber (30) → the outlet (32). At this time, the valve body (2) is closed by the pressure balance acting on the primary side and the secondary side of the diaphragm (D), and the valve part (22) is closed by the independent vacant chamber (3).
4) The open end is kept closed. When a reverse flow state occurs, the check valves (1a) and (1b) are closed. In particular, at the entrance (3
When the upstream side of 1) is in a negative pressure state, the diaphragm (D) bends toward the primary side pressurizing chamber (35) due to the pressure difference with the valve chamber (30), as shown in FIG. Valve (2) and valve (2
2) is opened, the valve chamber (30) is opened to the atmosphere side, and the communication between the upstream circuit and the downstream circuit of the valve box (3) is cut off. That is, the edge is cut off.

Therefore, backflow to the upstream side of the inlet (31) is reliably prevented. However, in this conventional device, the whole becomes large and the volume in the valve chamber (30) is relatively large. As a result, both sides of the hollow shaft (21) are opened to open the valve chamber (30) to the atmosphere side. By ensuring that the provided valve element (2) and valve section (22) are opened, the above-mentioned margining function is ensured.

A relatively long hollow shaft (21) is interlocked with the diaphragm (D) so that both the valve body (2) and the valve portion (22) at both ends of the hollow shaft (21) can be opened and closed. There is a need. As a result, smooth operation of the hollow shaft (21) may not be obtained. Furthermore, during normal use, if one of them is not closed, there is a disadvantage that the valve chamber (30) and the atmosphere side are always in communication with each other, causing leakage.

The present invention has been made in view of the above-mentioned point, and has been made in consideration of the following problem. "A check valve (1a) is provided at an inlet (31) and an outlet (32) of a valve chamber (30) formed in a valve box (3). ) (1b), an intake port (33) is formed in the valve chamber (30), which is closed by a member interlocking with the diaphragm (D), and the primary side of the diaphragm (D) is connected to the inlet (31). ) And the diaphragm
With the secondary side of (D) facing the valve chamber (30), the diaphragm (D)
When the primary side of the intake becomes lower than the valve chamber (30),
(33) is an open-cut valve that allows the whole to be miniaturized, and one valve seat opens and closes the responsive valve so that its operation can be assured. In addition, another object is to reduce the number of parts.

[0008]

[Technical Means] The technical means of the present invention for solving the above-mentioned problem is that "a primary side and a valve chamber (3) are provided at the center of the diaphragm (D).
0) side is provided with a cylindrical body (23), and the cylindrical body (23) is slidably fitted into the intake port (33) in an outer peripheral airtight state and slidably,
A valve seat (24) is provided on the end face of the cylinder (23) on the valve chamber (30) side, and a valve shaft (41) is provided in the valve chamber (30) coaxially with the cylinder (23). A check valve (1) is provided in the valve chamber (30), corresponds to the inlet (31), and is a lift valve provided coaxially with the fixed valve body (4). And the valve shaft of this check valve (1a)
(11) is slidably fitted into the cylindrical shaft portion (41), and the check valve (1a) is interposed between the check shaft and the bottom wall of the cylindrical shaft portion (41).
(12), the check valve (1b) is disposed downstream of the outlet (32).

[0009]

The above technical means operates as follows. Normally, the pressure on the primary side of the diaphragm (D) is high, so the valve seat
(24) is in contact with the fixed valve body (4), and the circuit on the outlet (32) side is closed. Then, the check valves (1a) and (1b) are opened and the inlet (3
Flow from 1) to exit (32).

When a reverse flow occurs, the check valves (1a) and (1b) are closed. When the upstream side of the inlet (31) becomes lower than the internal pressure of the valve chamber (30), the primary side of the diaphragm (D) becomes the valve chamber (30).
The internal pressure of the diaphragm (D) falls below the internal pressure, the diaphragm (D) shifts to the primary side, and the cylinder (23) associated therewith moves outward. As a result, the valve seat (24) and the fixed valve body (4) separate from each other, and this portion is opened. Thereby, the inside of the valve chamber (30) is released to the atmospheric pressure, and the upstream side and the downstream side of the valve chamber (30) are cut off.

In this case, the cylindrical body (23) is slidably held by the intake port (33), and this is linked with the operation of the diaphragm (D). Moreover, the diaphragm (D) and intake port (33)
Even in the state in which と approaches, the above-mentioned series of operations is not affected, so that the operation of the cylindrical body (23) is smooth. The valve that opens and closes the intake port (33) in conjunction with the diaphragm (D) is a fixed valve body.
Since only the combination of (4) and the valve seat (24) is provided, the number of valve units linked to the diaphragm (D) is only one.

Further, since the entire check valve (1a) is accommodated in the valve chamber (30), the entire check valve (1a) is generally smaller than the type in which the check valve (1a) is provided outside the valve chamber (30). Can be downsized.

[0013]

[Effect] The diaphragm (D) and the intake port (33) are provided close to each other, and the valve mechanism for opening and closing the intake port (33) and the check valve (1b) are both in the valve chamber (30). Because it is accommodated, the whole becomes compact. Since there is only one valve portion that opens and closes the intake port (33) in conjunction with the diaphragm (D), the overall degree of leakage due to dust bite is smaller than that of the conventional one.

Since the cylindrical body (23) interlocked with the diaphragm (D) is short and slidably fitted to the intake port (33), the operation of the diaphragm (D) and the members interlocked therewith is smooth. is there. Therefore, the edge cutting operation is reliable.

[0015]

Next, an embodiment of the present invention will be described in detail with reference to FIGS. In this embodiment, the valve box (3) is opened downward and extends from the side wall of the vacant chamber constituting the valve chamber (30) to the inlet side cylindrical portion.
(37) and a main body (3a) in which an outlet side cylinder (39) is connected, and a dish-shaped lid plate (3b) for closing an open end of the chamber,
The lid plate (3b) is provided with an air inlet (33), and
Diaphragm (D) between the open end of the empty space in (3a) and the lid plate (3b)
Is interposed.

The check valve (1b) is disposed so that the axis of the check valve (1a) is inclined at an angle of about 45 degrees and is substantially perpendicular to the axis. The check valve (1a) is housed in a valve chamber (30) in a valve box (3), and the other check valve (1b) is located downstream of an outlet (32) of the valve chamber (30). It is arranged. Each check valve is a lift valve, and is in contact with a valve seat formed on the downstream end surface of the inlet (31) and the outlet (32). The valve shaft (13) of the check valve (1b) has a cylindrical portion (51) of a lid (5) screwed to a component wall of a downstream flow path of the valve chamber (30) in the valve box (3). ) Is slidably fitted to the valve shaft (13) and is normally urged in the valve closing direction by a spring (52) interposed between the valve shaft (13) and the bottom wall of the cylindrical portion (51). ing. The diameter of the screw portion of the lid (5) is set to be larger than the diameter of the check valve (1b), and the check valve (1b) is screwed without the lid (5) attached. When the cover (5) is screwed and mounted with the spring (52) interposed after being inserted from the part, the check valve (1b) is mounted in a predetermined state.

The other check valve (1a) is supported so as to be able to open and close in relation to a cylindrical shaft (41) of a fixed valve body (4) housed in a valve chamber (30). The fixed valve body (4) is formed on an end face of a cylindrical shaft portion (41) formed in a bottomed cylindrical shape, and is provided in a valve chamber (3).
It faces the central part of the diaphragm (D) arranged near the component wall of (0). A flange (42) protrudes from the end opposite to the cylindrical shaft (41), and the flange (42) is fitted into a stepped hole (36) formed in the middle of the valve chamber (30). Then, it is fixed to a locking ring (43) which fits into the engaging groove of the stepped hole (36) along the lower surface of the flange portion (42) in a retaining state.

The cylindrical shaft portion (41) is open to the upper end surface of the flange portion (42), and a check valve (1) is provided in the flange portion (42).
The valve shaft (11) of a) is fitted. The check valve (1a) is urged in a valve closing direction by a spring (12) interposed between the valve shaft (11) and the bottom wall of the cylindrical shaft portion (41). Have been. Naturally, the opening posture of the inlet (31) and the cylinder shaft (4
The mounting position of the flange portion (42) is set so that the position of (1) is coaxial with the position of (1), and in this embodiment, the stepped hole (36) and the entrance (3
1), the direction of movement of the center of the diaphragm (D) and the inlet port (33) of the lid plate (3b) are coaxially arranged.

Beside the vacant space of the main body (3a), the main body (3a)
A communication path (61) that is open to the side wall open end face of the vacant chamber and that communicates with the inside of the inlet-side cylinder (37) is formed, and a diaphragm ( A through-hole (D ₁ ) is formed at a portion of the periphery of D) that coincides with the open end of the communication path (61). The lid plate (3b) is formed in a dish shape, and the air inlet (33) protrudes from the center of the recess. Further, a diaphragm (D) is interposed between the diaphragm (D) and the open end of the cover plate (3b) so as to close the recess, thereby forming a primary side pressurizing chamber (35). And, in the constituent wall of the lid plate (3b), the through hole (D ₁ )
A communication groove (62) is formed, which communicates with the primary side pressure chamber (35).

The cylindrical body (23) presses the periphery of the central through-hole of the diaphragm (D) by a flange (25) formed at the base end and a plate nut screwed into a threaded part following the flange (25). O-ring (26) is housed in a concave groove formed on the outer periphery of the distal end of the cylindrical body (23), and is connected to the diaphragm (D) in this manner, whereby the cylindrical intake port is connected to the lid plate (3b). (33) Airtight sliding inside. Further, a valve seat (24) is formed around the central opening of the flange portion (25). In this embodiment, the valve seat (24) is formed by a packing member.

In this embodiment, normally, FIG.
As shown in (1), the check valves (1a) and (1b) open, and the inlet side cylinder (37)
The pressure from the side acts on the primary-side pressurizing chamber (35) through the communication passage (61) and the communication hole (62), whereby the diaphragm (D)
Is bent to the fixed valve body (4) side to cut off the circuit to the intake port (33) and communicates from the upstream side to the downstream side, so that there is no leakage from the valve chamber (30) to the outside. In this embodiment, the flange (42)
Is formed with a plurality of through-holes (44), (44), so that the passage resistance due to the formation of the flange portion (42) in the valve box (3) in the communication state is reduced. It has become.

When a backflow condition occurs, the check valves (1a) and (1b) close. At this time, the pressure on the upstream side of the check valve (1a), that is, on the inlet side cylindrical portion (37) may be lower than that of the valve chamber (30), but in this case, the primary side pressurizing chamber (35 ), The diaphragm (D) deflects toward the primary pressurizing chamber (35), and the fixed valve body (4) and the valve seat (24) separate from each other. Mouth (3
Open to the atmosphere side via 3).

The operating pressure of the diaphragm (D) depends on the pressure receiving area of the diaphragm (D) and the operating pressure adjusting spring (B) interposed between the flange (42) and the flange (25).
And an O-ring (2) interposed between the cylindrical body (23) and the intake port (33).
It is set by the relationship with the sliding resistance in 6). or,
In this embodiment, when the axis from the inlet-side tubular portion (37) to the outlet-side tubular portion (39) is set to a horizontal posture, the axis of the valve chamber (30) is oblique. Therefore, the intake port (33) and the cylindrical body (23) face obliquely downward, and the fluid in the valve chamber (30) is more easily discharged than when these are configured to face just below.

Further, in the above embodiment, the cylindrical shaft portion of the check valve (1a)
(41), the cylinder shaft (41) of the fixed valve body (4) and the diaphragm
Since the axis of the cylinder (23) provided in (D) is inclined with respect to the vertical line, the opening surfaces of the inlet (31), outlet (32) and valve seat (24) are inclined. . Therefore, dust and the like located at the peripheral portion of the valve seat (24) and the like naturally fall downward, and the valve seat (24)
It is difficult for garbage to collect in parts.

Further, since the primary vacant space (35) is inclined, even if dust enters the primary vacant space (35), it will be located below the primary vacant space (35). Will accumulate. Therefore, there is less fear that the dust gets stuck in the relative sliding portion between the cylinder (23) and the intake port (33), and the smooth operation of the cylinder (23) can be secured. Further, in the above embodiment, the valve shaft of the check valve (1a) (1b)
(11) A through hole (H) (H) is formed in (13), a space surrounded by the valve shaft (11) and the cylinder shaft (41), and the valve shaft (13) and the cylinder (51). The space surrounded by is connected to the inside and outside. Therefore, when the check valves (1a) and (1b) open and close, the fluid in the enclosed space enters and exits through the through holes (H) and (H), whereby the check valves (1a) ( The smooth operation of 1b) can be secured.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a conventional example (in a state where a valve body (2) and a valve portion (22) are opened).

FIG. 2 is an explanatory diagram when there is a normal flow;

FIG. 3 is a cross-sectional view of the embodiment of the present invention (cross-sectional view when the primary side has a low pressure).

FIG. 4 is a cross-sectional view when there is a normal flow;

[Explanation of symbols]

 (3) ・ ・ ・ Valve box (30) ・ ・ ・ Valve room (31) ・ ・ ・ Inlet (32) ・ ・ ・ Outlet (1a) (1b) ・ ・ ・ Check valve (33) ・ ・ ・ Inlet (D) ・ ・ ・ Diaphragm (23) ・ ・ ・ Cylinder (24) ・ ・ ・ Valve seat (41) ・ ・ ・ Cylinder shaft (4) ・ ・ ・ Fixed valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 11/10 F25B 41/04 F16K 15/18

Claims (3)

(57) [Claims] An inlet (3) of a valve chamber (30) formed in a valve box (3).
Check valves (1a) and (1b) are provided at 1) and the outlet (32), and the valve chamber (30)
A suction port (33) is formed at the end of the diaphragm (D), which is closed by a member interlocking with the diaphragm (D), and the primary side of the diaphragm (D) is communicated with the upstream side of the inlet (31), and the diaphragm (D) is closed. Diaphragm with the secondary side facing inside the valve chamber (30)
In a gate valve in which the intake port (33) is opened when the primary side of (D) becomes lower in pressure than the valve chamber (30), the primary side and the valve chamber (30) are located at the center of the diaphragm (D). A cylinder (23) communicating with the cylinder body (23) is provided, and the cylinder (23) is slidably fitted to the intake port (33) in an outer peripheral airtight state and slidably fitted to the valve chamber ( A valve seat (24) is provided on the end face on the side of (30), and a fixed valve body (4) which is coaxial with the cylindrical body (23) and has a cylindrical shaft portion (41) in the valve chamber (30).
The check valve (1a) is housed in the valve chamber (30) and the inlet (31)
And a lift valve provided coaxially with the fixed valve body (4), and the valve shaft (11) of the check valve (1a) is
(41) is slidably fitted inside, and the check valve (1a) is urged in the valve closing direction by a spring (12) interposed between the check valve and the bottom wall of the cylindrical shaft portion (41), A gate valve in which the check valve (1b) is disposed downstream of the outlet (32). 2. The gate valve according to claim 1, wherein the intake port is set so as to face a direction inclined from a vertically downward direction. 3. A check valve (1a) having a cylindrical shaft portion (41) and a fixed valve body (4).
The cylindrical body (41) and the cylindrical body (23) provided on the diaphragm (D)
3. The gate valve according to claim 1, wherein an axis of the valve is inclined with respect to a vertical line.