JPH0322630Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a variable throttle device installed in a fluid conduit.

[Prior art and its problems]

When obtaining the performance of a machine by flowing fluid at a predetermined flow rate through a pipe, for example when supplying lubricating oil to the bearings of rotating machinery, it is necessary to ensure that the predetermined flow rate required by the bearing flows. The conduit is equipped with a variable throttle mechanism that adjusts the flow rate. However, when assembling and manufacturing machines and pipes, foreign matter such as chips and rags adheres to them. For this reason, before starting the rotating mechanism, a filter is installed in the pipe line to circulate the fluid through the mechanical parts and pipe lines through which the fluid flows, to collect and eliminate foreign objects floating in the fluid, and to prevent damage caused by foreign objects. It is prevented.
After removal, the filter is removed and a throttle mechanism is attached to ensure a predetermined flow rate. For this reason, by attaching a casing that can house and replace both the throttle mechanism and filter to the pipe line and replace the throttle mechanism and filter, flow rate adjustment and foreign matter removal can be performed separately. A variable aperture device is known.
The prior art will be described below with reference to the drawings.

FIG. 4 is a sectional view of a variable diaphragm device equipped with a conventional diaphragm mechanism. The cast casing 1 is provided with a fluid inlet nozzle 1a and an outlet nozzle 1b. The upper opening 1c of the casing 1 is threaded, and a lid 2 consisting of a tightening screw is inserted into this threaded hole and closes the opening 1c via a gasket 10.
In addition, the lid 2 is provided with a threaded through hole,
A valve stem 3a of a throttle mechanism 3 is screwed into this threaded through hole, and the tip of the valve stem 3 is provided with a throttle section 3b having a plurality of slits 3c as shown in FIG. Therefore, the height H between the collar 3d of the throttle portion 3b and the shoulder 1d of the casing 1 is adjusted by screwing the valve stem 3a. As a result, the slit 3c is opened according to the height H and serves as a fluid flow path.
In addition, screw the lock nut 4 onto the valve stem 3a, tighten it to the tightening screw 2 through the gasket 10, and then tighten the lock nut 4 onto the valve stem 3a.
This prevents a from loosening. Further, a cap nut 5 is tightened to the lock nut 4 via a gasket 10 to prevent fluid from leaking to the outside from the threaded portion of the valve stem 3a. With such a configuration, the inlet nozzle 1a
A predetermined flow rate of the fluid flowing in through the opening slit 3c of the throttling mechanism 3 flows in the direction of the arrow, and flows out from the outlet nozzle 1b.

By the way, as mentioned above, the assembly of mechanical parts and conduits,
During manufacturing, foreign matter attached to the lid 2, squeezing mechanism 3, lock nut 4, and cap nut 5 are removed as shown in Fig. 6.
(See FIG. 4) is removed and the filter 6 is inserted into the same casing 1. That is, the filter 6 made of a wire mesh cage is inserted through the opening 1c of the casing 1 and placed on the shoulder 1d of the casing 1.
Then, open the lid 2a equipped with the filter retainer 6a.
screw into the opening 1c through the gasket 10.
is closed. Note that the filter retainer 6a prevents the filter 6 from slipping out.

With this configuration, the fluid flowing in from the inlet nozzle 1a flows in the direction of the arrow, flows from the inside of the wire cage filter 6 to the outside, and flows out from the outlet nozzle 1b. At this time, foreign matter floating in the fluid is collected by the filter 6. Therefore, the foreign matter is removed from the fluid by stopping the flow of the fluid, opening the lid 2a, and removing the filter 6.

After the foreign matter is removed as described above, the throttle mechanism is inserted and adjusted as shown in FIG. 4 to determine the height H so that a predetermined flow rate flows.

However, in such a structure, since the lid and lock nut consisting of the tightening screw are large, a large tightening torque is required. For this reason, a large spanner is required and a large space must be taken up. In addition, since the lid is tightened by screw fitting, even if a gasket is used, there is a problem that it becomes difficult to apply surface pressure uniformly to the gasket due to manufacturing errors in the threads, and there is a risk of fluid leakage. . Furthermore, since the distance from the position of the inlet nozzle and the outlet nozzle to the lower part is long, there is also the drawback that a large space must be secured in consideration of the installation height.

[Purpose of invention]

In view of the above-mentioned points, the present invention aims to provide a variable throttle device with a compact structure that reduces fluid leakage and facilitates replacement of the flow rate throttle mechanism and the filter for removing foreign matter in the fluid. shall be.

[Summary of the idea]

The above object, according to the present invention, is a variable diaphragm device that can freely replace a fluid flow rate diaphragm mechanism and a filter, which comprises a top plate having an opening in the center and fixed to the opening surface of the top plate. a first container, a second container which stores and holds the first container inside and has a top plate with an opening in the center fixed to the opening surface; A first pipe provided through the side wall; and a first pipe provided through the side walls of both the first container and the second container at different positions approximately at the same height as the first pipe provided. A second pipe provided therein and a valve rod whose distal end is inserted into an opening in the upper plate of the first container to form a throttle mechanism are screwed into the center of the opening in the upper plate of the second container. a first lid that closes the second container; a second lid that has a presser bar on its inner surface and that closes the opening of the top plate of the second container;
a filter inserted into an opening in a top plate of the container, the first lid having the valve stem, the second lid and the filter being selectively connected to the first container and the second lid. This is achieved by attaching it to a container.

[Example of idea]

Embodiments to which the present invention is applied will be described below based on the drawings. FIGS. 1 and 2 are cross-sectional views of a variable diaphragm device according to an embodiment of the present invention. FIG. 1 shows the diaphragm mechanism, and FIG. 2 shows the variable diaphragm device with a filter attached. . Furthermore, Figure 1,
In FIG. 2 and FIG. 3, which will be described later, the same parts as in FIGS. 4 to 6 are designated by the same reference numerals.
In FIG. 1, reference numeral 11 denotes a first container, which includes a bottom plate 11a and a cylindrical body 1 that is welded to the bottom plate and stands upright.
1b and an upper plate 11c forming an opening 11d and welded to the cylindrical body 11b. The second container 12 stores the first container 11, and the second container 12 stores the first container 11.
The first container 11 is supported by sharing the bottom plate 11a of the two containers. That is, the second container 12
consists of a bottom plate 11a, a cylindrical body 12b welded to the bottom plate and standing upright, and an opening 12d formed in the cylindrical body 12b.
and an upper plate 12c welded to the upper plate 12c. 1st
The inlet nozzle 13, which is a tube, penetrates the lower tube wall of the cylindrical body 12b and is attached by welding. Further, the outlet nozzle 14 as the second pipe is located at a different position from the inlet nozzle 13 and at approximately the same level as the inlet nozzle 13, and is connected to both the cylindrical body 11b of the first pipe 11 and the cylindrical body 12b of the second container. It is attached by welding through the wall. Then, the lid 15 is attached to the upper plate 1 by bolts 16 via the gasket 20 so as to close the opening 12d of the second container 12.
It is tightened to 2c.

The throttle mechanism 3 has the same structure as the conventional example shown in FIG. It is inserted in 11d.
As described above, the flow rate is adjusted by the insertion depth of this constriction part. The lock nut 17 is tightened to the lid 15 via the gasket 20 to prevent the valve stem 3b from loosening. Further, the cap nut 18 is tightened to the lock nut 17 via the gasket 20 to prevent fluid from leaking to the outside from the thread of the valve stem 3a.

With this structure, from the inlet nozzle 13 to the second
The fluid that has flowed into the container 12 rises through the annulus of the first container 11 and the second container 12, and the flow rate is adjusted until the fluid flows through the slit 3c of the open constriction portion 3b.
It flows into the first container 11 through the outlet nozzle 14 and exits to the outside.

By the way, before the fluid is circulated through the machine as described above, foreign matter adhering to mechanical parts and pipes is removed by a filter made of a wire mesh cage as described above. That is, as shown in FIG.
7 (see FIG. 1) is removed, the filter 6 is inserted into the first container 11 through the opening 11d, the filter 6 is placed on the upper plate 11c, and the opening 11d is closed with a wire mesh. Then, a lid 15a provided with a filter retainer 6a for preventing the filter 6 from coming off is tightened with a bolt 16a via a gasket 20.

With this structure, the fluid flowing in from the inlet nozzle 13 enters the second container 12 in the direction of the arrow, flows up the annulus between the first container 11 and the second container 12, and reaches the inlet of the filter 6. from the outlet nozzle 1 to the outside of the filter.
It flows out through 4. At this time, foreign matter floating in the fluid is collected by the filter 6. After collection, the lid 15a is removed, the filter 6 is removed, and the throttling mechanism is inserted as described above to obtain a normal fluid flow.

With this configuration, the lids 15, 15a are tightened with a plurality of bolts via the gasket, so
The surface pressure applied to the gasket can be made almost uniform, eliminating fluid leakage from this location. Third
The figure is a sectional view of a variable diaphragm device according to a different embodiment of the present invention, which is equipped with a diaphragm mechanism. In the figure, a bottom plate 11a of a first container 11 is welded to a bottom plate 12a of a second container 12 and supported by a plurality of upright support columns 19 by welding. Even with such a structure, the same effect as described above can be obtained in replacing the throttle mechanism and filter and in fluid flow.

[Effect of idea]

As is clear from the above description, the present invention has a double container structure consisting of a first container and a second container housing the first container, and the flow of fluid is directed to the second container.
from the inlet nozzle of the container into the second container;
further flowing into the first container through a diaphragm mechanism or filter provided at the opening of the first container,
By arranging the flow to the outside through the outlet nozzle penetrating the first container and the second container, the inlet nozzle and the outlet nozzle can be easily positioned at the bottom of the container and at the same level. This has the advantage that the length below the inlet nozzle and outlet nozzle can be shortened, requiring less space. Also the second
The lid that closes the opening of the container is tightened with bolts through the gasket, so unlike conventional screw fittings, it can be tightened with a small tightening torque, does not require a large space for tightening, and can be tightened with a gasket. Since a uniform surface pressure is applied to these parts, there is an effect that there is no leakage of fluid from these parts.
In addition, since the structure according to the present invention can easily use a welded structure, it also has the effect of reducing the manufacturing cost when the number of manufactured pieces is small.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a variable diaphragm device equipped with a diaphragm mechanism according to an embodiment of the present invention, FIG. 2 is a sectional view of a variable diaphragm device equipped with a filter according to an embodiment of the present invention, and FIG. A sectional view of a variable diaphragm device equipped with a diaphragm mechanism according to a different embodiment of the invention, FIG. 4 is a sectional view of a variable diaphragm device equipped with a conventional diaphragm mechanism, and FIG. FIG. 6 is a sectional view of a variable diaphragm device equipped with a conventional filter. 3: Throttle mechanism, 6: Filter, 11: First container, 11d: Opening of first container, 12: Second container, 12d: Opening of second container, 13: Inlet as first pipe Nozzle, 14: outlet nozzle as second tube, 15, 15a: lid.

Claims (1)

[Scope of utility model registration request] A variable throttle device that can freely replace a fluid flow rate throttle mechanism and a filter, the first container having an upper plate having an opening in the center fixed to the opening surface of the upper plate; a second container which stores and holds the inside of the container, and has an upper plate having an opening in the center fixed to the opening surface thereof, and a first pipe provided through a side wall of the second container. a second tube that penetrates the side walls of both the first container and the second container at a different position at approximately the same height as the first tube; a first lid that is inserted into the opening of the upper plate of the first container and has a valve rod that forms a throttle mechanism screwed into the center thereof and closes the opening of the upper plate of the second container; a second lid having a presser bar thereon and closing an opening in a top plate of the second container; and a filter inserted into an opening in a top plate of the first container; A variable diaphragm device characterized in that a first lid with a rod, the second lid and a filter are selectively attached to the first container and the second container.