JPH04106594U - Removable multi-stage orifice - Google Patents

Abstract

(57) [Summary] [Purpose] To easily replace the orifice plate installed inside the short pipe casing. [Structure] The orifice plate 12 and the ring-shaped spacer 14 are sequentially inserted into the short tube casing 10, the most advanced (most downstream) orifice plate 12 is brought into contact with the annular seal shoulder 10a, and then the short tube casing 10 is brought into contact with the annular seal shoulder 10a. The most upstream orifice plate 12' is attached to the internal threaded portion 10b of the
Then, screw in the ring-shaped lock nut 16 to lock it. Therefore, by releasing the lock, all the orifice plates and spacers can be easily attached and detached (replaced).

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is for fluid piping, especially high pressure fluid piping in general chemical industry, petrochemical industry, etc. Concerning the multi-stage orifice that reduces the pressure of the fluid inside, it is especially easy to replace the orifice. This invention relates to a removable multi-stage orifice configured to allow

0002

[Conventional technology]

Generally, an orifice connected to the fluid piping is used to reduce the fluid pressure in the fluid piping. Multi-stage orifice with one orifice plate installed inside the short pipe casing. A multistage orifice with multiple orifices installed is used.

However, in high-pressure fluids, the pressure reduction width (differential pressure) that is generally required is large, so if a single-stage orifice is used, the noise due to fluid squeezing noise increases and the orifice diameter rapidly decreases due to erosion. The disadvantage is that the orifice life is shortened due to enlargement. For this reason, multi-stage orifices are usually used for large differential pressures (usually 10 kgf/cm ² or more). According to this, the differential pressure per orifice stage is reduced, so that the noise is reduced, and at the same time, it is also possible to effectively suppress changes over time in orifice performance (enlargement of orifice diameter).

0004

[Problem that the idea aims to solve]

However, the conventional multi-stage orifice has the following drawbacks. In other words, in general, in multi-stage orifices, the change in orifice performance over time is As mentioned above, the differential pressure per orifice stage is small, so it is suppressed, but However, it is not completely prevented. Therefore, even in multi-stage orifices, It is necessary to replace each orifice plate at regular intervals. However, conventional A multi-stage orifice may have each orifice plate welded to the short tube casing. It was fixed by press fitting. For this reason, in conventional multi-stage orifices, , When replacing the orifice plate at regular intervals, the orifice plate Replacing the entire multistage orifice is difficult and impractical, and the entire multistage orifice is usually replaced. was. Note that replacing the orifice plate is not related to changes in orifice performance over time. In addition, changes in usage conditions (flow rate, pressure, etc.) may also make it necessary, so the above-mentioned difficulties It was further encouraged.

[0005] Therefore, the purpose of this invention is to easily replace the orifice plate when necessary. The object of the present invention is to provide a removable multi-stage orifice.

[0006]

[Means to solve the problem]

In order to achieve the above objective, the removable multi-stage orifice according to the present invention is used for fluid piping. Multiple orifice plates are sequentially linked inside the short pipe casing that is connected to the It is characterized by being removably attached via a tag-shaped spacer.

[0007] In this case, in the direction of fluid flow, the orifice plate on the most downstream side is connected to the short tube case. the annular seal shoulder provided on the downstream inner circumferential surface of the thing, and then the upstream orifice. After installing the plate in sequence through the ring-shaped spacer, attach the ring-shaped lock nut. It is preferable to lock it by screwing it into the internal thread provided on the upstream inner circumferential surface of the short pipe casing. or, in addition, the most upstream orifice plate may be placed inside the short pipe casing. It can also be locked to the same location. Note that the ring-shaped spacer is connected to the downstream orifice. Attachment to the spray plate is advantageous during assembly.

[0008]

[Effect]

Each orifice plate is fitted with a lock nut and/or the most upstream orifice. When the plate is unlocked, it can be easily attached to and detached from the short tube casing. subordinate Therefore, the orifice performance may change over time or the conditions of use of the orifice may change. In some cases, only the orifice plate can be replaced without replacing the entire multi-stage orifice. This can be done easily and inexpensively by simply replacing or changing it.

[0009]

【Example】 Next, an embodiment of the detachable multi-stage orifice according to the present invention will be explained with reference to the attached drawings. This will be explained in detail below.

0010 FIG. 1 shows the inside of an opposed flange short pipe casing 10 with flanges at both ends. Then, the five orifice plates 12, 12' are sequentially connected through the ring-shaped spacer 14. It is attached removably. Note that the casing 10 is a short pipe of another type, e.g. For example, it should be configured with an opposed threaded short tube casing with threaded sections at both ends. I can do it.

[0011] The short pipe casing 10 has an annular seal shoulder 10a on its inner peripheral surface on the downstream side and It has an internal threaded portion 10b on its inner peripheral surface. The four downstream orifice plates 12 and The ring-shaped spacer 14 has an outer diameter approximately equal to the inner diameter d of the short pipe casing 10. each ring-shaped spacer 14 is Each downstream orifice plate 12 is connected by spot welding 14a at multiple locations. It is worn. The most upstream orifice plate 12' has a short pipe casing on its outer peripheral surface. It has an external thread that is screwed into the internal threaded portion 10b of the tag 10. Further, reference numeral 16 is a link The figure shows a lock nut with an outer circumferential surface having an outer thread that is screwed into the inner threaded portion 10b. has. Note that the spacer 14 can be constructed without being attached to the orifice plate 12. You can do it.

0012 When assembling the removable multi-stage orifice of the present invention, which has such a configuration, First, the attached orifice plate 12 and ring-shaped spacer 14 are sequentially removed. Insert into the short pipe casing 10 to insert the most advanced (most downstream) orifice plate 1 2 against the annular seal shoulder 10a, and then the inner threaded portion of the short pipe casing 10. Screw the most upstream orifice plate 12' into the The assembly is completed by screwing in and locking. Also, each orifice sp. When replacing the rate 12', remove the lock nut 16 and orifice plate 1. By releasing the lock of 2', each orifice plate is attached to the short pipe casing 1. It is easily separated from 0. Please note that locking is done only with the lock nut 16. In other words, the orifice plate 12' can be connected to other orifices without locking. It may be configured similarly to the plate 12.

[0013] Therefore, according to the removable multi-stage orifice of the present invention, the drawbacks of the single-stage orifice can be overcome. In other words, noise caused by fluid squeezing noise and shortened orifice life can be eliminated. Of course, there is a problem with the conventional multi-stage orifice, namely the orifice for the short tube casing. The difficulty of replacing the fiss plate is completely eliminated as described above. like this According to the present invention, multi-stage orifices are used in orifices for large pressure differences in high-pressure fluids. You can replace only the orifice plate or open the orifice plate without changing the entire orifice. It is configured so that the orifice diameter or orifice stage number can be easily changed. Easy to handle changes in orifice performance over time and changes in operating conditions (flow rate, pressure, etc.) And it can be done at low cost. It is also generally easy to maintain as well. And it can be done at low cost.

[0014] Although the present invention has been described above with reference to a preferred embodiment, the present invention is limited to the above-mentioned embodiment. Without limitation, many design changes are possible within the spirit of the invention. .

[0015]

[Effect of the idea]

As explained above, the removable multi-stage orifice according to the present invention has a short pipe casing. Multiple orifice plates can be installed and removed sequentially through ring-shaped spacers inside the In other words, in a multi-stage orifice, the multi-stage orifice You can replace the orifice plate or change the orifice diameter without changing the entire orifice. Or, since the structure is configured so that the number of orifice stages can be easily changed, the orifice performance can be improved. Easily and inexpensively respond to changes in performance and operating conditions (flow rate, pressure, etc.) can do. Also, general maintenance tasks can be handled easily and inexpensively as well. I can do that. Note that the orifice of the present invention is configured in multiple stages, so The differential pressure per stage of the orifice becomes smaller, causing noise due to fluid throttling and orifice. Needless to say, shortening of service life can be solved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a detachable multi-stage orifice according to the present invention.

[Explanation of symbols]

10...Short pipe casing 10a...Annular seal shoulder 10b...Inner thread part 12, 12'...orifice plate 14...Ring-shaped spacer 14a...Spot welding 16...Ring lock nut

Claims (4)

[Scope of utility model registration request] 1. A removable multi-stage orifice comprising a plurality of orifice plates removably installed in sequence through a ring-shaped spacer inside a short pipe casing connected to a fluid piping. 2. With respect to the fluid flow direction, the orifice plate on the most downstream side is brought into contact with an annular seal shoulder provided on the downstream inner circumferential surface of the short pipe casing, and then the orifice plate on the upstream side is sequentially attached through a ring-shaped spacer. After installing the
2. The removable multi-stage orifice according to claim 1, wherein the ring-shaped lock nut is screwed into an internal thread provided on the upstream inner circumferential surface of the short pipe casing to lock it. 3. The removable multi-stage orifice according to claim 2, further comprising locking the most upstream orifice plate to an internal threaded portion of the short pipe casing. 4. The removable multi-stage orifice according to claim 2 or 3, wherein the ring-shaped spacer is attached to the orifice plate on the downstream side thereof.