JPH0121129Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field of the invention The present invention relates to a reserve tank for a heat exchanger. More specifically, the present invention relates to an improvement in the pressure-resistant structure of a pressurized reserve tank for a heat exchanger made of a resin material.

(b) Background of the technology Pressurized reserve tanks for heat exchangers are increasingly made of resin materials, which are lightweight and have excellent anti-corrosion properties. For this reason, a method is adopted in which the upper half having the neck and the lower half other than the neck are separately molded, and then the two are joined and integrated. Therefore, the strength of the integration at the joint between the upper half and the lower half determines the pressure resistance of the pressurized reserve tank for a heat exchanger.

For this reason, there is a strong need for the development of strong integration means at the joint between the upper half and the lower half.

(C) Prior Art and Problems Conventionally, as a means of integrating the upper and lower halves of a reserve tank for a heat exchanger, fixation by welding has been used. Figure 7 shows the structure of a reserve tank for a heat exchanger that is fixed by welding.At the joint C between the upper half A and the lower half B, which have a neck 1, the joint ends of the two are connected. Connecting part C by providing flanges 2a and 2b
The area has been expanded to improve the adhesion effect of welding.

Nylon, which has good heat resistance, is suitable as a resin material for use in reserve tanks for heat exchangers. However, as a characteristic of nylon, it has a low adhesion effect due to welding. However, there are problems in that durability is poor and water leakage is likely to occur.

In addition, as a measure against water leakage, it is known to adopt a structure using packing as shown in Japanese Utility Model Publication No. 51-6615, but there is no problem with sealing performance, but pressure resistance must be considered. The issue remains.

(iv) Purpose of the invention Based on the above, the purpose of the invention is to strengthen the integration between the upper and lower halves of a pressurized heat exchanger reserve tank made of resin material. .

(e) Structure of the invention In order to achieve this objective, the reserve tank for a heat exchanger according to the invention is constructed by separately molding an upper half having a neck for attaching a pressurizing cap and a lower half other than this, and making it possible to combine both. In a resin reserve tank for a heat exchanger that is integrated by joining the upper and lower halves, packing is inserted at the joint between the upper and lower halves, and the upper and lower halves are connected at or near this joint. An engaging portion is provided that engages with the lower half and prevents separation.

(f) Examples of the invention Hereinafter, examples of the reserve tank for a heat exchanger according to the invention will be described.

FIG. 1 shows the overall structure of a reserve tank for a heat exchanger according to the present invention, in which an upper half A having a neck 1 and a lower half B other than the neck 1 are joined and integrated. A packing 3 such as an O-ring is installed at the joint C between the upper half A and the lower half B, and the inside of this joint C (inside the tank)
An engaging portion 4 is provided nearby.

2 and 3 are enlarged views of the joint portion C. In FIG. 2, the packing 3 is housed in a groove 6 provided at the joint end 5a of the upper half A, and the packing 3 is inserted into the joint of the lower half B. The engaging portion 4 is in pressure contact with the end 5b, and the engaging portion 4 has a stepped portion 4b shaped such that the joining end 5b of the lower half B extends inward, and the joining end 5b of the upper half A extends in the direction of the lower half B. It consists of a hook part 4a that looks like this, and a stepped part 4.
b engages with the hook portion 4a to prevent the upper half A and the lower half B from separating. Note that FIG. 3 shows a structure in which the step portion 4b and the foot portion 4a are reversed in structure.

In the structure shown in FIGS. 2 and 3, when joining the upper half A and the lower half B, if they are brought into pressure contact, the stepped part 4b and the hook part 4a will engage, and the upper half A and the hook part 4a will be engaged. and lower half B are integrated, and separation between the two is prevented.

In the structure shown in FIGS. 2 and 3, when internal pressure is applied, stress acts to separate the upper half A and the lower half B, but when this stress acts, the stepped portion 4b and the joint surface D of the tip of the hook part 4a are brought into further pressure contact, preventing separation of the upper half A and the lower half B, and improving sealing performance to prevent steam from reaching the joint part C. The infiltration of such substances is prevented. Moreover, even if steam or the like intrudes into the joint portion C, the packing 3 prevents it from leaking to the outside. Further, the step portion 4b and the hook portion 4 at the joint surface D
The further pressure contact with the tip of the joint portion C brings the joining ends 5a and 5b of the joint portion C into pressure contact with each other by lever action, or further increases the pressure contact between these ends and the packing 3, thereby improving the sealing performance.

It is preferable that the engaging part 4 consisting of the step part 4b and the hook part 4a shown in FIGS. 2 and 3 be provided around the entire circumference of the upper half part A and the lower half part B. There is no problem even if it is provided partially.

The embodiment shown in FIG. 4 has the engaging portion 4 in FIG. 2 symmetrically provided on the outside, and although the structure is slightly more complicated than that in FIG. 2, it has the advantage of further improving pressure resistance and sealing performance. be.

The embodiment shown in FIG. 5 has flanges 2a and 2b shown in FIG. 7 in addition to the embodiment shown in FIG. Although it cannot be expected to improve the sealing performance, it has the advantage of improving the sealing performance.

In addition to the embodiment shown in FIG. 5, the embodiment shown in FIG. 6 has fasteners 6 fitted and fixed to the flanges 2a and 2b, and has the advantage of improved pressure resistance compared to FIGS. 2 and 5. There is.

In addition, when the engaging part 4 in the above-mentioned embodiment has a considerable thickness in the upper half part A and the lower half part B,
It is also possible to provide it in the joint portion C itself.

(G) Effects of the invention As described above, in the reserve tank for a heat exchanger according to the invention, the upper half and the lower half are strongly integrated, and the pressure resistance and sealing performance are improved. In particular, similar effects can be obtained by using nylon, which has good heat resistance, as the resin material, making it possible to provide a reserve tank for a heat exchanger with good heat resistance.

Furthermore, during manufacturing, the upper and lower halves are assembled by simply pressing them together, which simplifies the assembly work, simplifies assembly equipment, and reduces manufacturing costs. be.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a reserve tank for a heat exchanger according to the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a sectional view showing a modification of FIG. 2.
4 to 6 are sectional views of main parts showing other embodiments of the reserve tank for a heat exchanger according to the present invention, respectively;
FIG. 7 is a sectional view showing a conventional example. 1... Netting, 3... Packing, 4... Engaging part, A... Upper half, B... Lower half, C... Joining part.

Claims (1)

[Scope of utility model registration request] In a resin reserve tank for a heat exchanger, the upper half with the neck for attaching the pressure cap and the lower half other than the above are separately molded and then joined and integrated. It is characterized by interposing a packing in the joint part with the joint part, and providing an engaging part in which the upper half and the lower half part are engaged and prevented from separating at this joint part or in a place close to this. Reserve tank for heat exchanger.