JPH08159330A - Valve disc open/close device for slide valve - Google Patents

Abstract

PURPOSE: To provide a valve disc open/close device for a slide valve, allowing the application of a simple structure as well as an easy manual operation with a small force, and ensuring high safety. CONSTITUTION: A valve disc is connected to the lower end of the piston stem 6 of an actuator 12. Also, a ball screw 13 formed out of an external thread section 13a formed on the outer surface of the stem 6 and an internal thread section 13b engaged therewith, is provided and the first intermediate gear 16 is made to gear with a piston stem side gear 14 integrated with the section 13b. An interlocking shaft 19 is interlocked with and jointed to a manual operation shaft 17 via a warm gear mechanism 18. At the same time, the second intermediate gear 21 is made to gear with a manual operation side gear 20 fixed to the shaft 19, and a clutch mechanism 22 is provided for jointing the gears 16 and 21 to each other in such a state as freely separable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide valve such as a high temperature slide valve installed in the middle of a flow path through which a high temperature fluid containing a powdered fluid such as a chemical catalyst is passed in a petroleum refining facility. The body can be opened and closed easily by switching from driving by an actuator to manual operation.

[0002]

2. Description of the Related Art An example of a high temperature slide valve is shown in FIGS.
Describing on the basis of the above, the inlet 2a of the flow path 2 for circulating the high temperature fluid containing the powder fluid in the valve box 1 is formed in a taper shape, and the valve seat 3 provided substantially in the center of the flow path 2 is provided. A valve member 5 formed by a cone member 3A having through holes 3a and 3b formed in the center thereof and an orifice plate 3B provided at an end face on the downstream side of the cone member 3A, and opening and closing the flow path 2 is the orifice plate 3B. Is slidably supported by a guide member 4 provided on the downstream end face of the valve body 5, and the valve body 5 is slid by an actuator via a piston stem 6 to open (closed line in FIG. 4) or close the flow path 2 (see FIG. 4). The state of the virtual line in FIG. 4) is possible. In the figure, 8 is a heat-resistant material lined on the inner surface of the valve box 1, 9 is a connecting member for integrally connecting the cone member 3A and the valve box 1, 10 is an inlet 2a, a valve seat 3 and a valve body 5. It is a wear resistant material that is lined in the part that is exposed to high temperature fluid.

In order to open and close the valve body 5, a manual operation means (not shown) is provided separately from the actuator. Conventionally, the manual operation means is provided separately from the piston stem 6. It is composed of two provided manual handle operating drive shafts and a split nut that is screwed into the male screw portion of each drive shaft, and is operated manually when the actuator is out of conformity such as drive system failure. The valve body 5 can be manually slid by means.

[0004]

SUMMARY OF THE INVENTION In the above conventional configuration,
The structure of the manual operation means is complicated, the production cost is high,
The manual operation requires an excessive amount of labor, and the valve body may unexpectedly slide during the manual operation, which may pose a danger to a worker, resulting in a safety problem.

In view of the above problems, it is an object of the present invention to provide a valve body opening / closing device for a slide valve which has a simple structure and can be easily manually operated with a small force. There is.

[0006]

In order to achieve the above-mentioned object, the present invention is designed so that a valve element provided in a flow passage in a valve box is connected to a piston stem of an actuator provided outside the valve box to drive the actuator. By sliding the valve body to open and close the flow path, a male screw portion formed on the outer peripheral surface of the piston stem and a female screw portion screwed to the male screw portion are formed. A ball screw is provided, a first intermediate gear is meshed with a piston stem-side gear integrally formed with the female screw portion, and an interlocking shaft is interlockingly connected to a manually operating shaft via a worm gear mechanism, and the interlocking shaft is A second intermediate gear is meshed with the fixed manual side gear, and a clutch mechanism is provided for connecting the first intermediate gear and the second intermediate gear in a disengageable manner.

[0007]

In the above construction, the valve body can be slid to open or close the flow path in the valve box by driving the actuator to expand and contract with the clutch mechanism normally turned off.

Next, if the actuator is incompatible with the drive system or the like, the clutch mechanism may be turned on and the manually operated shaft may be manually rotated in the forward and reverse directions. Accordingly, the piston stem can be expanded and contracted by the ball screw to slide the valve element through the worm gear mechanism, the interlocking shaft, the manual side gear, both intermediate gears, and the piston stem side gear.

In this case, the valve body is slid through the piston stem not only when it is driven by an actuator but also when it is manually operated, and the piston stem is also used. The structure is simpler and the manufacturing cost can be reduced.

Further, since the ball screw is provided between the piston stem and the gear on the piston stem side, the manual operation can be easily performed with a small force. Moreover, due to the self-locking function peculiar to the worm gear mechanism, there is no risk of the valve body unexpectedly sliding during manual operation, and safety is high.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a valve body opening / closing device for a slide valve, which is an embodiment of the present invention.
2 is provided with a ball screw 13 consisting of a male screw portion 13a formed on the outer peripheral surface of the piston stem 6 and a female screw portion 13b screwed to the male screw portion 13a, and the piston stem integrally formed with the female screw portion 13b. The first intermediate gear 16 fixed to the intermediate shaft 15 is meshed with the side gear 14, the interlocking shaft 19 is interlockingly connected to the manual operation shaft 17 via the worm gear mechanism 18, and the manual side fixed to the interlocking shaft 19 is connected. The second intermediate gear 21 is meshed with the gear 20,
The second intermediate gear 21 is rotatably arranged on the intermediate shaft 15, and a clutch mechanism 22 is provided for connecting the first intermediate gear 16 and the second intermediate gear 21 in a disengageable manner. Reference numeral 23 is a manual handle detachably attached to the manual operation shaft 17, 24 is a brake device such as a band brake provided on the intermediate shaft 15, and 25 is a bearing that rotatably supports the intermediate shaft 15 and the interlocking shaft 19. .

According to the above construction, since the piston stem 6 is used for both the driving operation by the actuator 12 and the manual operation, the structure is simpler than the conventional one and the manufacturing cost can be reduced.

The clutch mechanism 22 may be an electromagnetic clutch mechanism, a hydraulic clutch mechanism, or a manual friction clutch mechanism shown in FIG. This is because a plurality of one-side friction plates 28 are slidably attached to the boss portion 16a of the first intermediate gear 16 which is keyed to the intermediate shaft 15 and are rotatably arranged on the intermediate shaft 15 via bearings 29. A plurality of the other side friction plates 30 are slidably attached to the cylindrical body 21a which is protrudingly provided on the provided second intermediate gear 21 and which is loosely fitted to the boss portion 16a. And the friction plates 30 on the other side are alternately arranged, and the boss portion 16
A cam lever 32 is inserted into a recess 31 formed in the outer peripheral surface of a along the axial direction, and the vicinity of the base end of the cam lever 32 is swingably supported via a pivot shaft 33. A base end portion 32a of each of the friction plates 28 and 30 is opposed to the front end portion 32b of the shift plate 34, and a shift pulley 34 is slidably fitted onto the boss portion 16a. When the shift pulley 34 is slid from the off state of the clutch mechanism 22 shown by the solid line in FIG. 2, as shown by the phantom line in FIG.
By pushing down the tip portion 32b of the cam lever 32 about the pivot shaft 33, the base plates 32a of the cam lever 32 press the friction plates 28, 30 against each other,
The clutch mechanism 22 is turned on, and the first intermediate gear 16
And the second intermediate gear 21 can be interlockingly connected.

In the above structure, the clutch mechanism 2 is usually used.
2 and the actuator 24 is driven to expand and contract with the brake device 24 turned off. As a result, the valve body 5 is slid through the piston stem 6, and the flow passage 2 in the valve box 1 is moved.
Can be opened or closed (see FIGS. 3 and 4). After the opening / closing adjustment by the valve body 5 is completed, the brake device 24 is turned on, whereby the valve body 5 can be prevented from sliding unexpectedly.

Next, when the actuator 12 has a nonconformity such as a failure of the drive system, the brake device 24
Is turned off, the clutch mechanism 22 is turned on, and the manual handle 23 is manually operated to manually operate the manual operation shaft 17
Can be rotated forward and backward. As a result, the piston stem 6 is expanded and contracted by the ball screw 13 via the worm gear mechanism 18, the interlocking shaft 19, the manual gear 20, the intermediate gears 16 and 21, and the piston stem gear 14, and the valve body 5
Can be slid.

In this case, since the ball screw 13 having a very small frictional resistance is used, the piston stem 6 can be easily expanded and contracted by manual operation. In addition, the self-locking function peculiar to the worm gear mechanism 18 allows the valve body 5
There is no risk of accidental sliding, and safety is high.

In the above embodiment, the actuator 12
For this, various cylinder devices such as a hydraulic type, a hydraulic type, and an electric type can be used.

[0018]

According to the present invention, the valve body is slid through the piston stem not only when the actuator is driven but also when the actuator is manually operated, and the piston stem is also used. Therefore, the structure is simpler than the conventional one, and the manufacturing cost can be reduced.

Further, since the ball screw is provided between the piston stem and the gear on the piston stem side, the manual operation can be easily performed with a small force. Moreover, due to the self-locking function peculiar to the worm gear mechanism, there is no risk of the valve body unexpectedly sliding during manual operation, and safety is high.

[Brief description of drawings]

FIG. 1 is a front view of an essential part showing a valve body opening / closing device in a slide valve that is an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a clutch mechanism used in the device.

FIG. 3 is a vertical sectional view of the slide valve.

FIG. 4 is a cross-sectional view of the slide valve.

[Explanation of symbols]

 1 Valve Box 2 Flow Path 5 Valve Body 6 Piston Stem 12 Actuator 13 Ball Screw 13a Male Threaded Part 13b Female Threaded Part 14 Piston Stem Side Gear 16 First Intermediate Gear 17 Manual Operation Shaft 18 Worm Gear Mechanism 19 Interlocking Shaft 20 Manual Side Gear 21st 2 Intermediate gear 22 Clutch mechanism

Claims (1)

[Claims] 1. A valve body provided in a flow path inside the valve box is connected to a piston stem of an actuator provided outside the valve box, and the actuator is driven to slide the valve body to drive the flow. In a slide valve configured to open and close a passage, a ball screw having a male screw portion formed on an outer peripheral surface of the piston stem and a female screw portion screwed to the male screw portion is provided, and a piston integrally formed with the female screw portion. The first intermediate gear is meshed with the stem-side gear, the interlocking shaft is interlocked with the manual operation shaft via a worm gear mechanism, and the second intermediate gear is meshed with the manual-side gear fixed to the interlocking shaft. A valve body opening / closing device for a slide valve, comprising a clutch mechanism that releasably connects the first intermediate gear and the second intermediate gear.