JPH0426760Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention consists of a main body to which piping is connected, a bottomed case that houses a filter element, etc., and a case guard that covers and protects it. The present invention relates to a case guard holding device for holding a case guard on a main body of a pressure vessel such as an air filter or an air lubricator that can be assembled freely.

"Prior Art" Conventional case guard holding devices of this type are roughly classified into the following three types based on their structure.

(1) Screw-in method As shown in Figure 6, there are female screws 2 on the bottom of the main body 1.
A male screw 6 is provided at the upper end of the outer peripheral surface of the case guard 5 that covers the case 4, and the male screw 6 is screwed into the female screw 2 of the main body 1 to complete the case guard. 5 is held in the main body 1, and at the same time, the upper end of the case 4 is brought into pressure contact with the top surface of the recess 3 by this screwing, and is held in the main body 1.

(2) Engagement method As shown in FIG. 7, there are a plurality of engagement protrusions 3a on the inner peripheral surface of the recess 3 of the main body 1, and a plurality of engagement protrusions 4a on the upper ends of the case 4 and the case guard 5. , 5a are provided respectively, and these engaging protrusions 4a, 5a are connected to the main body 1.
The case 4 and the case guard 5 are held on the main body 1 at the same time by engaging with the engagement protrusion 3a.

(3) Clamp ring method As shown in Fig. 8, the clamp ring 7 is screwed onto the male screw 8 provided on the outer circumferential surface of the main body 1, and the clamp ring 7 and the lower surface of the main body 1 are connected to the flange of the case 4. The portion 4b and the flange portion 5b of the case guard 5 are held.

``Problems that the invention aims to solve'' However, in all three conventional methods, when trying to make the main body more compact, the area where the case and case guard are attached is large, which limits miniaturization. There were also problems such as high cost.

The purpose of the present invention is to reduce the space of the mounting portion of the case and the case guard as much as possible to reduce the overall size, and to reduce the manufacturing cost with a simple holding structure.

"Means for solving the problem" In order to achieve this purpose, the present invention applies and improves the conventional screw-in method and engagement method, and its configuration is as follows. .

A recess with a female thread is provided on the lower surface of the main body to which the piping is connected, and a recess with a male thread and a case guard holding recess is provided on the upper end of the outer circumferential surface of the bottomed case that houses the filter element and the lower side thereof. Furthermore, an inner convex portion is provided at the upper end of a case guard that covers the case. Then, the male screw of the case is screwed into the female screw of the main body, and the inner convex part of the case guard is fitted into the case guard holding recess of the case and held between the recess and the lower edge of the recess of the main body. be.

"Operation" According to this structure, when the case is screwed into the recess of the main body, the upper end of the case guard is simultaneously held between the lower edge of the recess and the outer surface of the case, and is suspended from the lower surface of the main body. become a state. In this case, the inner convex portion at the upper end of the case guard fits into the case guard holding recess on the outer peripheral surface of the case, and the case guard is also firmly held against the case.

"Embodiment" Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

Fig. 1 shows the case where it is applied to an air filter, and the main body 10 has piping connection ports 11 on both sides.
12. A circular recess 13 is provided on the lower surface, and a female thread 14 is engraved on the inner peripheral surface of the recess 13, and the lower opening edge of the recess 13 is chamfered as shown in FIG. It has a tapered surface 15.

The transparent case 16 has a cylindrical shape with a bottom, and the outer peripheral surface has a male screw 1 at the upper end, as shown in FIG.
7 is engraved therein, and a case guard holding recess 18 is formed below the male thread 17 extending all around the circumference, and a slightly vertically elongated protrusion 19 is further formed below this recess 18 as shown in FIG. There are four sets of two wires arranged in parallel.

The case guard 20 that covers the case 16 also has a cylindrical shape with a bottom, and as shown in FIG.
An inner convex portion 21 that curves inward around the entire circumference of its upper edge
At the same time, a plurality of splits 22 are formed at the upper end portion including the inner convex portion 21 to provide elasticity to the portion between them, and a slightly vertically elongated four-way wall recessed inward is formed on the lower side of the split 22. A plurality of vertically elongated windows 24 are provided below the recessed convex portions 23, and a hole 25 is provided at the center of the bottom.

In order to assemble the main body 10, case 16, and case guard 20 configured in this way, the case 16 is covered with the case guard 20, and the case guard 2 is assembled.
As shown in FIG.
At the same time, the recessed protrusions 23 of the case guard 20 are fitted between the protrusions 19 of each set of the case 16 as shown in FIG. 3, and the case guard is inserted in this state. 20 and turn the case 16 together with the male screw 17 of the main body 1.
0 female screw 14. By this screwing, the inner convex portion 21 of the case guard 20 is divided into two parts.
2, the tapered surface 1 of the recess 13 of the main body 10 expands slightly due to the elastic force caused by the
5, and is held between this tapered surface 15 and the case guard holding recess 18 of the case 16, so that the entire case guard 20 is firmly suspended from the lower surface of the main body 10, as shown in FIG.

In FIG. 1, a deflector 26, a cylindrical filter element 27, and a buttful plate 28 are attached to the lower side of the main body 10 in a case 16 with mounting bolts 29, and the case 1
A known manual drain valve 30 is attached to the bottom of the case guard 6, and its operating rod 31 projects downward from the hole 25 of the case guard 20.

"Effects of the invention" As stated above, the present invention has the following effects.

By screwing the case into the recess of the main body, the inner protrusion of the case guard fits into the case guard holding recess of the case and is held between the recess and the lower edge of the recess of the main body, making assembly easy. easy,
Moreover, since the structure is a simple mechanism, it can be provided at low cost.

Since there is less space to attach the case and case guard to the main body, it can be made smaller.

The case guard is held between the case and the main body using the screwing force of the case, and the inner convex part of the case guard is fitted into the case guard holding recess of the case, so that the case guard can be securely held in the main body.

[Brief description of the drawings]

Drawings 1 to 5 show one embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of the whole, Fig. 2 is an enlarged sectional view of the main part, and Fig. 3 is a cross-sectional view of the case and case guard. 4 is a partial longitudinal sectional view of the case, and FIG. 5 is a longitudinal sectional view of the case guard. Figure 6,
FIGS. 7 and 8 are sectional views of conventional examples, respectively. 10...Body, 13...Recess, 14...Female thread, 15...Tapered surface, 16...Case, 17
...Male thread, 18...Case guard holding recess, 2
0...Case guard, 21...Inner convex portion, 22...
...Discount.

Claims (1)

[Claims for Utility Model Registration] 1. Female thread 1 on the bottom surface of the main body 10 to which piping is connected.
4, and a male screw 17 and a case guard holding recess 18 are provided on the upper end of the outer peripheral surface of the bottomed case 16 that accommodates a filter element, etc. An inner convex portion 21 is provided at the upper end of the case guard 20 that covers the male thread 17 of the case 16.
is screwed into the female screw 14 of the main body 10, and the inner protrusion 21 of the case guard 20 is fitted into the case guard holding recess 18 of the case 16, and is held between the recess 18 and the lower edge of the recess 13 of the main body 10. A case guard holding device for a pressure vessel characterized by: 2. The case guard holding device for a pressure vessel according to claim 1, wherein a split 22 is formed at the upper end of the case guard 20, and the upper end has elastic force. 3 Attach the case guard 2 to the lower edge of the recess 13.
The case guard holding device for a pressure vessel according to claim 1 or 2, characterized in that a tapered surface 15 is formed with which the inner convex portion 21 of 0 is pressed.