JPH0113883Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an internal protection device for a manufacturing powder conveyance processing device equipped with a vacuum valve, and in particular, a simple shielding sleeve that completely protects the sealing part of the vacuum valve and the valve mechanism from circulating powder. By simply adding a vacuum valve, a commercially available vacuum valve can be used, which is not only advantageous in terms of cost, but also promises improved operability and durability due to its effective dustproof function.

For example, in the production of heat-resistant superalloy powder, ultra-cleanliness is required for the produced powder, and it is necessary to completely prevent non-metallic particles and dissimilar metal particles from entering the production process due to dust, and to prevent re-oxidation due to the atmosphere. There is.

Therefore, in view of these requirements, the container of each device is evacuated, and the powder is handled in the vacuum or in an inert gas filled after the vacuum is evacuated.

In each device, even if it is continuous,
Even if it is a batch type, it is necessary to have ports for introducing and discharging the powder, and a vacuum valve is also required for evacuation in between.

By the way, there are various types of commercially available vacuum valves, such as L-type or S-type vacuum valves, flap valves, and ball valves, but even if you use any of these, powder will accumulate in various places such as the valve mechanism and seal parts, and they will not work immediately. The vacuum valve becomes inoperable and cannot fully perform its original vacuum valve function, and this is generally the same with flap valves and gate valves.

This invention was devised in view of these circumstances, and the feature here is that the upper entrance passage, the lower exit passage, and the intermediate guide passage between both passages are arranged in a substantially serial relationship. A vacuum valve, such as a gate or flap type, is arranged in the manufacturing powder conveyance path, and the valve body that closes between the inlet passage and the guide passage is placed in the valve casing outside the intermediate guide passage, and is configured to stand by when opened. In the above-mentioned inlet passage, a fixed sleeve having a contact receiving surface at the lower end is provided, and the outlet passage is composed of an outer cylinder and a presser cylinder having a double inner and outer cylinder, and when the vacuum valve is opened, A blocking sleeve for blocking the outer periphery of the intermediate guide passage in a cylindrical shape is provided between the outer cylinder and the presser cylinder so as to be able to move forward and backward through a seal so that the inlet passage and the outlet passage are directly connected, The shielding sleeve has an upper part thereof a close contact surface that is pressed against the close contact receiving surface, and a sleeve cover that surrounds the presser cylinder from the inside.

This invention will be explained below with reference to illustrated embodiments.

FIG. 1 shows an example in which powder produced in an atomizing chamber 1 is stored in a powder container 2 located below it. Each part is as shown in FIGS. 2 to 7.

Heat-resistant superalloy powder is produced in the atomizing chamber 1, and the powder is transferred to the lower powder container 2 under conditions that do not involve non-metallic substances or foreign metal particles, and prevent re-oxidation due to the atmosphere. Two sets of vacuum valves 3 and shutoff valves 4 are arranged in series between the atomizing chamber 1 and the powder container 2, which are carried in under vacuum or in an inert gas atmosphere, and one set of vacuum valves 3 is installed at the lower end of the powder container 2. and a shutoff valve 4.

First, the upper vacuum valve 3 and shutoff valve 4 are as shown in FIGS. 2 to 4, and each vacuum valve 3 is a commercially available gate valve type. It takes the configuration of adding.

The vacuum valve 3 has a gate valve 5 equipped with a vacuum gasket on the upper surface, and the gate valve 5 moves the inside of the valve casing 7 into the closed state shown by the solid line in FIG. 2 by opening and closing a gate lever 6 from the outside. Each responds to the open state of the virtual line. In this case, the gate lever 6 is equipped with a lever shaft 8 shown in FIG. 4 and a swing arm (not shown) connecting the gate valve 5 and the same shaft 8, which together with the gate valve 5 constitute a valve mechanism. The seal portion is constituted by the ring seal 9 shown in FIG. 2 and the like.

Atomized chamber 1 and valve casing 7
A shielding fixing sleeve 11 with a mounting flange 10 coaxially protrudes downward on the inner periphery of the gap, and forms a contact receiving surface 12 with a tapered surface at its lower end, and an inlet passage 13 is formed on its upper side. A tapered cylindrical introduction tube 14 forming an upper portion is fixedly provided.

On the other hand, a shut-off valve outer cylinder 16 is attached to the lower inner periphery of the valve casing 7 with a clamp mechanism 15, and a shut-off sleeve 17, which is a feature of this invention, is movable up and down on the inner periphery of the outer cylinder 16. It is fitted.

The sleeve 17 may be vertically raised and lowered linearly, but in this example, the following rotational raising and lowering method is used. This is to ensure light and smooth opening/closing operation, and in this case, a sleeve holding cylinder 18 is provided along the inner circumference of the shutoff sleeve 17, and an O-ring 19 is interposed between this and the shutoff valve outer cylinder 16. At the same time, a double row of O-rings 19 are interposed on the outer periphery of the upper end of the presser cylinder 18. On the other hand, regarding the outer periphery of the shielding sleeve 17, an O-ring 19 is similarly fitted and arranged on the inner periphery of the upper end of the outer cylinder 16, and
A grease nipple 20 is provided protruding from the outer cylinder 16 in order to facilitate the raising and lowering of the shielding sleeve 17 and to strengthen the vacuum seal by applying vacuum grease. Although the O-ring 19 is shown as an example of the sealing mechanism, other sealing mechanisms may of course be used.

In this way, the upper end of the shielding sleeve 17 is formed with an elevating contact surface 21 that presses against the contact receiving surface 12 as it rises, and the sleeve cover 2
2 is fixed in a hanging shape. This cover 22 effectively prevents powder from intervening between the shielding sleeve 17 and the sleeve presser cylinder 18.

In addition, in order to raise and lower the shielding sleeve 17, the outer cylinder 16
A cam groove 23 is formed in the cam groove 23, and the closing operating lever 24 is taken out from the closing sleeve 17 through the groove 23, and is opened and closed within the range shown in FIG.

Therefore, after the gate valve 5 is closed and vacuum is drawn, the valve 5 is retracted into the valve casing 7, and in this state, the shutoff operation lever 2 is
4 in the closing direction, the vertical contact surface 21 is tightly fitted to the contact receiving surface 12, and the outer periphery of the intermediate guide passage 25 where the gate valve 5 was located is completely closed.
A ring seal 9, a valve mechanism, a valve casing 7 side, and a powder passage are defined. This allows the powder to be transported from the inlet passage 13 to the outlet passage 26 without affecting other parts. Note that 27 indicates a roller follower.

In this way, one set of the vacuum valve 3 and the shutoff valve 4 is constructed, and two sets of these are arranged vertically at the bottom of the atomizing chamber 1 mentioned above, and are connected to each other by the clamp mechanism 15. .

On the other hand, at the end of the powder container 2 in FIG. 1, there is provided a shutoff valve 4 with three vacuum valves having a configuration substantially similar to that described above, and this is as shown in FIGS. 5 to 7. The detailed explanation will be omitted.

Furthermore, although they are structurally similar to the above-mentioned ones, they are shown in FIGS. 8 and below as different mounting objects.

Fig. 8 shows an elevator platform frame 28 equipped with an elevator guide rod 29 and a powder container 2 mounted thereon.A vacuum valve 3 and a shutoff valve 4 are provided on the inlet and outlet sides, respectively. It is said to be equipped with 30 vibrating sieves. Connecting pipe 3 from this vibrating sieve 30
The lower end of 1 is a telescopic pipe 32, and a vacuum valve 3 and a shut-off valve 4 are connected to the lower end of the telescopic pipe 32, and a blender 33 at the bottom is connected.
are connected. The present invention is as described above, and according to the present invention, when guiding the powder, the blocking sleeve 17 shuts off the seal packing of the vacuum valve 3, the valve mechanism, the casing, etc. from the powder. In addition to solving the problem of inoperability due to accumulation of powder, the vacuum valve 3 does not need to be specially configured, and is commercially available, since it is possible to completely prevent powder from occurring by simply adding the blocking sleeve 17. It is useful in that it allows you to reuse what you have.

In addition, since the shielding sleeve 17 is provided between the outer cylinder 16, which is a dual inner and outer cylinder, and the presser cylinder 18, through a seal 19, the shielding sleeve 17 can be moved back and forth smoothly and accurately. Furthermore, the contact surface 21 formed on the upper part of the blocking sleeve can be replaced with the contact surface 1 formed on the fixed sleeve 11 of the entrance passage 13.
2, the outer periphery of the intermediate guide passage 25 can be completely closed off, and the shielding sleeve 17 has a sleeve cover 22 that surrounds the presser tube 18 from the inside. Therefore, it is possible to effectively prevent powder and the like from entering the sliding portion, and also prevent premature damage to the seal 19.

In addition to gate valves, flap valves and other types of valves may also be used, and the term "other" refers to other valve types in which the inlet, outlet, and intermediate guide passage are in series, and in which the blocking sleeve and the valve do not interfere when the valve is opened. refers to

[Brief explanation of drawings]

Figure 1 is a front view of a vacuum valve/shutoff valve configured into a device equipped with an atomizing chamber/powder container, Figure 2 is a detailed view of section E in Figure 1, and Figure 3 is its F section.
-F line sectional view, Figure 4 is Figure 1 A-A line sectional view,
Figure 5 is a detailed view of part C in Figure 1, Figure 6 is Figure 5 D-
Figure 7 is a sectional view taken along the line B-B in Figure 1. Figure 8 shows a device that includes a powder container, a vibrating sieve, a blender, etc., and is housed in the lower powder container, with a vacuum valve and shutoff valve attached. This is a front view. 3...Vacuum valve, 4...Shutoff valve, 13...Inlet passage, 17...Shielding sleeve, 25...Intermediate guide passage, 26...Outlet passage.

Claims (1)

[Claims for Utility Model Registration] A valve body that has an upper inlet passage, a lower outlet passage, and an intermediate guide passage between the two passages in a substantially series relationship, and closes the gap between the inlet passage and the guide passage is an intermediate guide. In a vacuum valve such as a gate or flap type configured to stand by when opened in the valve casing outside the passage in the manufacturing powder conveyance path, a fixed valve having a tight receiving surface at the lower end in the entrance passage. A sleeve is provided, and the outlet passage is made up of an outer cylinder and a presser cylinder, which are double-cylindered inside and outside, and an intermediate guide passage is provided so that when the vacuum valve is opened, the inlet passage and the outlet passage are in direct communication with each other. A shielding sleeve that blocks the outer periphery in a cylindrical shape is provided between the outer cylinder and the presser cylinder so as to be able to move forward and backward through a seal, and the shielding sleeve has a tight fitting on its upper part that is pressed against the tight receiving surface. 1. An internal protection device for a manufacturing powder conveyance processing device with a vacuum valve, characterized in that the sleeve cover has a surface and surrounds the presser cylinder from the inside.