JPH0449503Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an improvement of a heat exchanger for precipitating liquids that uses a plastic tube as a heat transfer tube, and specifically relates to a heat exchanger with improved durability. .

[Conventional technology]

BACKGROUND ART Conventionally, in plating tanks, degreasing tanks, and various reaction tanks, tubes made of corrosion-resistant resin such as fluororesin are used as heat exchanger tubes as heat exchangers used for heating or cooling highly corrosive liquids. For example, in Japanese Utility Model Application Publication No. 60-43876, a large number of small-diameter, thin-walled plastic tubes are inserted into several groups through a plurality of through holes provided in a spacer, and both ends of the tubes are bundled. A heat exchanger is disclosed in which a honeycomb-like joint is formed at the terminal part and a weight is provided along the bundle of plastic tubes to prevent floating in the liquid tank. discloses a heat exchanger in which a bundle of plastic tubes with honeycomb-like joints formed at both ends is attached to a corrosion-resistant support plate to prevent floating or shaking in a liquid tank.

[The problem that the idea aims to solve]

By the way, when such a heat exchanger is used to heat various precipitating treatment solutions, such as those used in electroless plating or phosphate film treatment, which is used as a base for painting rust prevention on steel, these treatment solutions However, in the liquid, it tends to accumulate between the plastic tubes of the plastic tube bundle and in the tube insertion holes and gaps between the plastic tubes and the spacer, so the accumulated liquid is excessively heated by the steam passing through the plastic tubes, and the processing liquid Metal salts, complexing agents, etc. dissolved in the liquid precipitate as crystals in the gaps and on the spacers, and the precipitation is particularly noticeable near the liquid surface because the plastic tubes are densely packed. However, there was a problem that these crystals damaged the plastic tube. In this case, if the precipitated crystals are needle-shaped, the life of the tube will be extremely short, and an improvement has been awaited.

Therefore, this invention solves the problems of the prior art described above, and provides a heat exchanger for precipitating liquids that has excellent durability and whose tubes will not be damaged by crystals even when used in a plating tank etc. is its purpose.

[Means to solve the problem]

In order to achieve the above-mentioned purpose of this invention, according to this invention, a plurality of plastic tubes are bundled, and both ends of the plastic tubes are integrally connected to a sleeve to form a bundle of plastic tubes arranged in a honeycomb shape. In a device in which heat exchange is performed by immersing a midway portion in a precipitating liquid, the plurality of plastic tubes are supported apart from each other by a spacer at a position above the liquid level, and the portion submerged in the liquid is A heat exchanger for a precipitable liquid is constituted, at least a part of which is loosely held together by a support and supported so as to be swingable within a predetermined range.

[Effect]

When the heat exchanger configured as described above is immersed in a precipitation liquid such as a plating liquid, and the liquid is heated by flowing a high temperature fluid such as steam into each plastic tube, each plastic tube is heated. Since the tubes are supported by spacers provided above the liquid surface so that they are separated from each other near the liquid surface, the liquid flows smoothly through the gaps between the plastic tubes near the liquid surface and does not stagnate. . Therefore, excessive heating of the liquid is prevented, so that the precipitation of crystals in this area, which has hitherto been particularly noticeable, is eliminated.

In addition, when submerged in liquid, multiple plastic tubes are loosely tied together by a support and supported so that they can swing within a predetermined range. oscillates due to the stirring of the liquid. Due to this oscillation, gaps are formed between each plastic tube, and since these are fluctuating, the liquid in the liquid tank is difficult to stay between the tubes, and even if crystals are deposited, they are quickly removed. , they do not attach and grow.

〔Example〕

FIG. 1 is an overall front view showing an embodiment of a heat exchanger for precipitable liquids according to this invention. It is composed of a body 30.

Here, the plastic tube bundle 10 is made of, for example, a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (hereinafter referred to as PFA).
A plurality of plastic tubes 11 are bundled together, and sleeves 12 made of polytetrafluoroethylene resin are fitted onto both ends of the plastic tubes 11, and the sleeves 12 made of polytetrafluoroethylene resin are bonded together by means such as heat fusion to form a honeycomb-like airtight seal at the ends. A connecting portion is formed, and in the embodiment, it is bent into a substantially U-shape.

As shown in detail in a plan view in FIG. 2, the spacer 20 is made of a corrosion-resistant plastic plate in which a large number of tube insertion holes 21 are arranged on the vertices of an equilateral triangle.
The plastic tubes 11 are received in the tube insertion holes 21, and the plastic tubes 11 are supported at equal intervals from each other, and a support rod 34 of a support body 30, which will be described later, is inserted into a portion near the short side. It has a rod insertion hole 22,
The spacer 20 is placed close to both end portions of the plastic tube bundle 10.

Next, the support body 30 consists of two support plates 31 and two support rods 34, and the support plate 31 has a large elliptical tube bundle insertion hole 32 and a tube bundle insertion hole 32, as shown in FIG. It is a corrosion-resistant plastic plate having two rod insertion holes 33 on both sides, and is provided at two bent portions of the substantially U-shaped plastic tube bundle 10, and the plastic tube bundle 10 is loosely bundled. to hold. Further, as the support rod 34, for example, a lead rod coated with PFA is used, and is bent along the shape of the plastic tube bundle 10, and these support plates 34
1 and each rod insertion hole 22 of the spacer 20, one each is disposed on the inner circumference side and the outer circumference side of the plastic tube bundle 10, and this support rod 34
This fixes the support plate 31 and the spacer 20 at a predetermined position on the plastic tube bundle 10, and also maintains the bent shape of the plastic tube bundle 10.

In this way, 10 plastic tube bundles
The plastic tubes 11 are held apart from each other by spacers 20 near their ends, and their shape is controlled by two supports 31 and two support rods 34 in the middle. At the same time, the plastic tube bundle 10 is loosely tied at two places, so that each plastic tube 11 can swing within a predetermined range. In this case, plastic tube 11
The swing range can be appropriately selected depending on the situation inside the liquid tank, for example, by changing the size of the tube bundle insertion holes 32 of the support plate 31, the number of support plates 31, their positions, etc. Furthermore, it is of course possible to change the number of support rods 34 and their positions.

When the heat exchanger 1 having such a configuration is applied to heating a liquid in which dissolved substances tend to precipitate, such as plating liquid, a terminal joint (not shown) is connected to the sleeve 12, and a steam supply pipe is connected to the terminal joint. The plastic tube bundle 10 is used by connecting the plastic tube bundle 10 to a predetermined position in a liquid tank with the spacer 20 positioned above the liquid level. Here, each plastic tube 11 is
Since the spacer 20 securely holds the liquid near the liquid surface, it is difficult for the liquid to stagnate in the gaps between the plastic tubes 11 near the liquid surface, where crystals often precipitated in the past. is prevented. Furthermore, when in the liquid, the plastic tube bundle 10 is loosely held by the support plate 31 of the support body 30, and each plastic tube 11
are supported so as to be able to swing within a predetermined range, so each plastic tube 11 swings due to changes in the pressure of the fluid flowing within the plastic tube 11 or agitation of the fluid within the liquid tank T. A gap is formed between the two, and this gap is constantly changing, so that liquid is difficult to accumulate, and even if crystals precipitate, they are quickly removed and do not adhere and grow.

Although not shown in the embodiment, as a means for fixing the positions of the spacer 20 and the support plate 31 with respect to the support rod 34, for example, a method of inserting a fixing tube into the support rod 34 described in Japanese Utility Model Application No. 60-43877 can be used. ,
Alternatively, it can be fixed by tying it with monofilament without using a fixing tube, and a rod or pipe made of other materials may be used instead of the lead rod. Furthermore, for example, the support rod 3
4 is replaced by a monofilament, and this monofilament is tied to the spacer 20 and the support plate 31 in sequence. If both ends thereof are tied to the sleeve 12, it is not necessarily necessary to provide the support rod 34. Furthermore, instead of the support plate 31, a filament may be used to bind and hold the plastic tube bundle 10.

FIGS. 4 and 5 show other embodiments of heat exchangers for precipitable liquids according to their respective inventions. Note that explanations of parts that overlap with those of the embodiment in FIG. 1 will be omitted, and the same parts will be designated by the same reference numerals.

In the heat exchanger 40 of the embodiment shown in FIG.
A single plastic plate 41 is used as a spacer to hold both ends of the plastic tube bundle 10 together. A plastic plate 42 serving as a support member is secured to the spacer 41 at its upper portion, intersecting the center portion of the spacer 41.
The plastic tube bundle 10 is inserted into a hole similar to the tube bundle insertion hole 32 of the support plate 31 shown in FIG. It is becoming. In this case, 1 plastic tube bundle
Since the plastic tube 11 is supported in three places near both ends and in the center, each plastic tube 11 does not come apart, and is held loosely in the center, so that each plastic tube 11
works properly to prevent liquid stagnation and to quickly remove any crystal deposits. In the heat exchanger 50 shown in FIG. 5, a plastic tube bundle 10 is inserted into the hollow part of a coiled metal or plastic support rod 51 and is loosely gripped from the outside. This coiled rod 51 holds the plastic tube bundle 10 approximately by U.
It retains its shape. Both ends of the rod 51 are fixed to the spacer 20, and each plastic tube 11 is configured to be able to swing within the rod 51. In this case, the rod 51 is used as the support rod 34 in the embodiment shown in FIG.
Lead rods coated with PFA are suitable, and as in the heat exchanger of the embodiment shown in FIG. When it flows, it acts as a weight and prevents it from rising.

[Effects of the invention] As explained above, according to this invention, a plurality of plastic tubes are bundled and both end portions of the plastic tubes are integrally connected to a sleeve to form a honeycomb-like airtight joint. In a device that performs heat exchange by immersing the middle part of the bundle in a solution containing dissolved crystalline substances, such as a plating solution, a plurality of plastic tubes are used.
For precipitating liquids, which are supported apart from each other by spacers at positions above the liquid level, and the parts submerged in the liquid are loosely held together by a support and supported so as to be able to swing within a predetermined range. Since it is a heat exchanger, the liquid flows freely through the gaps between the plastic tubes near the liquid level, so there is no stagnation. In addition, each plastic tube oscillates in the liquid, creating gaps between the tubes, and this gap changes, making it difficult for the liquid to stay between the tubes, and even if crystals precipitate, they are quickly removed. . Therefore, the plastic tube is not damaged by crystals deposited between the plastic tubes or between the plastic tube and the tube insertion hole of the spacer, unlike in the past, and the durability is greatly improved. .

Note that this invention is not limited to the above-mentioned embodiments; for example, changes may be made within the technical concept of this invention, such as changing the material and shape of the support, or changing the arrangement of the tube insertion holes of the spacer to a rectangular arrangement. Of course, various modifications are possible.

[Brief explanation of the drawing]

Fig. 1 is an overall front view showing an embodiment of the heat exchanger for precipitable liquids according to this invention, and Fig. 2 shows a part of the spacer used in the heat exchanger for precipitable liquids of the embodiment shown in Fig. 1. Plan view shown in Figure 3
This figure is a plan view of the support plate, and FIGS. 4 and 5 are overall front views showing other embodiments. 10...Plastic tube bundle, 11...Plastic tube, 12...Sleeve, 20,
41...Spacer, 31...Support plate, 30,4
2,51...Support.

Claims (1)

[Scope of utility model registration request] In a method in which a plurality of plastic tubes are bundled, both end portions of which are integrally bonded to a sleeve and arranged in a honeycomb shape, the middle part of the plastic tube bundle is immersed in a precipitating liquid to perform heat exchange. The plastic tubes of the book are supported apart from each other by spacers above the liquid level, and the parts submerged in the liquid are
1. A heat exchanger for a precipitable liquid, characterized in that at least a part of the heat exchanger is loosely held together by a support and is supported so as to be swingable within a predetermined range.