JPH045905Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The invention relates to a plate heat exchanger in which a lining is attached to the opening in the frame for the entry and exit of a heat exchange medium, and more specifically, the metal lining can be welded to the frame in a good manner The present invention relates to a plate heat exchanger.

PRIOR TECHNOLOGY A plate heat exchanger generally has a predetermined number of heat exchange plates stacked between a pair of plate-shaped frames, and a different number of heat exchange plates are placed in the space formed between each plate. By passing the media alternately, heat exchange between the two types of heat exchange media is performed. Further, the plate-shaped frame is provided with openings that serve as inlet holes or outlet holes for a heat exchange medium into the space formed between the plates.

By the way, when a corrosive heat exchange medium is used for heat exchange in the plate heat exchanger, the heat exchange plate that comes into direct contact with the medium is made of a corrosion-resistant material. However, for reasons of cost, the frame in which only the apertures are in contact with the medium is made of a metal material that is generally readily available, and only the area around the apertures is made of a corrosion-resistant material. A lining is installed to prevent the apertures from being corroded by media.

Figures 3 and 4 show an example of a frame in which a lining is fitted around an aperture for the above purpose. In the figure, 1 is a frame, 2 is an opening formed in the frame 1 that serves as an inlet hole or an exit hole for a heat exchange medium, 3a and 3b are recesses formed on the outer periphery of the openings at both ends of the opening 2, and 4 is an opening. This is the lining attached to 2. The lining 4 is composed of a pair of cylindrical bodies 5a and 5b as shown in FIG. 4, and flanges 6a and 6b are integrally formed at one open end of each cylindrical body 5a and 5b, respectively. be. When the lining 4 consisting of the pair of cylindrical bodies 5a and 5b is attached to the opening 2 of the frame 1, the fourth
As shown in the figure, a pair of cylindrical bodies 5a, 5b were inserted into the opening 2, and the flanges 6a, 6b were brought into contact with the seating surfaces 3a', 3b' of the recesses 3a, 3b provided on both sides of the opening 2. Afterwards, as shown in FIG. 5, a pair of cylinder bodies 5a, 5
The lining 4 is attached to the opening 2 by welding the openings at opposite ends of the openings 2 to each other within the opening 2. Further, some of the above-mentioned linings 4 have the structure shown in FIGS. 6 and 7. The lining 4 shown in FIG. 6 has a flange 6 at one open end.
The cylindrical body 5a is made up of a cylindrical body 5a having a diameter of 1.5 mm, and a flange 6b welded to the other open end of the cylindrical body 5a. The lining 4 shown in FIG. 7 is composed of a cylindrical body 5a inserted into the opening 2 and a pair of flanges 6a and 6b welded to both ends of the cylindrical body 5a. Then, the lining 4 shown in FIGS. 6 and 7 above
Similarly to those shown in FIGS. 3 to 5, each member is placed in the opening 2 provided in the frame 1 as shown, and then the opposing parts of each member are welded together within the opening 2. By doing so, the lining 4 is attached to the opening 2.

Among the linings to be attached to the opening 2, there is also a metal lining manufacturing method disclosed in Japanese Patent Publication No. 59-501120 and a metal lining manufactured by this method. As shown in FIG. 8, the lining 10 disclosed in this publication is formed by plastic working a thin circular plate to form an open cylinder 12 having a flange 11 at the end. Then, this cylinder 12 is inserted into an opening 2 provided in the frame 1, and the end of the cylinder 12 protruding from the opening 2 is opened outward by plastic working, and flanged as shown by the dashed line in the figure. Accordingly, the lining 10 is attached to the opening 2.

Problems to be Solved by the Invention As shown in Figs.
When the welding is performed by welding the members together, an inert gas such as Ar gas may be supplied to the welding part to cut off air in order to perform the welding well. That is, various materials are selected as the material for the lining 4 depending on the liquid quality of the heat exchange medium, but if metal titanium or the like is used as this material, the welding part becomes high temperature due to welding heat, and the temperature in the air increases. Oxidized by oxygen. For this reason, an inert gas is supplied to the welded portion of the lining 4 to block air and prevent oxidation.

By the way, since the above-mentioned welding is performed from the center side of the opening 2, the air in the high temperature area can be blocked off with an inert gas on the welding surface side of the lining 4 by using an appropriate jig. The air filling the gap formed between the inner circumferential surface of the lining 2 and the outer circumferential surface of the lining 4 cannot be replaced with inert gas. There was a problem in that the lining 4 was oxidized by oxygen contained in the air, making it impossible to perform good welding. Furthermore, this
The gap 1 is necessarily formed due to dimensional tolerances during processing and assembly reasons between the lining 4 and the frame 1, and this gap 1 cannot be eliminated.

Furthermore, if the lining 10 shown in FIG. 8 is fitted into the opening 2 drilled in the frame 1 by forming the flange 11 by plastic working, there is no need for welding. The above problem will be resolved. However, in this case, in order to apply plastic working to the lining 10, a thick lining material cannot be used;
The wall thickness is limited to around 1mm. For this reason, for example, in a type where the lining has a groove for attaching a gasket for media sealing, a medium-thick board with a thickness of about 6 to 10 mm is used as the lining material, and the wall thickness of the lining is set to 6 to 10 mm. Lining 1 of the type shown in Figure 8 is required.
0 cannot be used, and the lining 4 shown in FIGS. 3 to 7 must be used, resulting in the above-mentioned problem.

Means for Solving the Problem A plurality of members constituting the lining are arranged in the openings formed in the frame of the plate heat exchanger that serve as inlet holes or outlet holes for the heat exchange medium, and each of these members is For those that are joined by welding within a hole, one end is opened on the outside of the frame and the other end is located on the outer periphery of the hole on the frame surface, and the other end is located on the outside of the hole. A ventilation groove is provided to open into the gap formed between the surface and the member constituting the lining, and to supply inert gas into the gap.

Function As mentioned above, inert gas is supplied through the ventilation groove provided in the frame into the gap formed between the inner circumferential surface of the hole bored in the frame and the member constituting the lining. By doing so, the members constituting the lining can be welded together in an inert gas atmosphere.

Embodiment FIGS. 1 and 2 show an embodiment of the present invention. In the figures, 20 is a frame of a plate heat exchanger, and 21 is an inlet hole for a heat exchange medium drilled in the frame 20. Opening hole serving as an exit hole, 22a, 2
2b is a recess formed on the outer periphery of the openings at both ends of the aperture 21. As shown in FIG. Reference numeral 4 denotes a lining installed in the opening 21, and this lining 4 has a flange 6 at one opening end, similar to that shown in FIGS. 3 to 5.
a pair of cylindrical bodies 5a and 6b respectively formed;
5b. 23a and 23b are ventilation grooves provided in the seating surfaces 22a' and 22b' that contact the flanges 6a and 6b of the recesses 22a and 22b;
The ventilation grooves 23a, 23b are formed by arranging a pair of cylinders 5a, 5b constituting the lining 4 in the opening 21, and bringing the flanges 6a, 6b into contact with the seating surfaces 22a', 22b' of the recesses 22a, 22b, respectively. In this state, one end 2 of each ventilation groove 23a, 23b
3a', 23b' are open to the outside of the frame 20,
The other end portions 23a'' and 23b'' open into the space 1 formed between the inner circumferential surface of the opening 21 and the lining 4.

In the above configuration, the cylindrical bodies 5a and 5b constituting the lining 4 are arranged in the opening 21 of the frame 20 in which the ventilation grooves 23a and 23b are provided in the seating surfaces 22a' and 22b' of the recesses 22a and 22b. body 5a, 5
After bringing the flanges 6a, 6b of b into contact with the seating surfaces 22a', 22b' of the recesses 22a, 22b, the cylinders 5a,
When welding the opposite end surfaces of the frames 20, if an inert gas is supplied into the ventilation groove 23b from the end 23b' of one ventilation groove 23b by opening outward from the frame 20, the inert gas can be supplied to the ventilation groove 23b. The other end 2 of 23b
3b'' into the space 1 formed between the inner peripheral surface of the opening 21 and the lining 4, and in parallel with this, the air in the space 1 passes through the other ventilation groove 23a and flows into the frame 20. is exhausted to the outside, and the space between the two is filled with inert gas.In this state, as in the conventional case,
By welding the opposite end surfaces of the pair of cylinders 5a and 5b while supplying inert gas to the welding surface side of the lining 4 using a suitable jig, the welding work can be performed in an inert gas atmosphere. Since oxidation by oxygen does not occur, a good weld can be obtained.

Incidentally, in the above embodiment, an example in which two ventilation grooves 23a and 23b were provided in the frame 20 was explained.
Only one ventilation groove is provided, and when inert gas is supplied into the gap 1 through this ventilation groove, the air in the gap 1 is transferred to the cylindrical bodies 5a, 5 inserted into the openings 21.
The air may be exhausted to the outside from the gap formed at the joint part b. In addition, as described above, the present invention is applicable not only to the welding of the lining 4 consisting of the pair of cylinders 5a and 5b within the opening 21, but also to the necessary parts of the lining 4 of the type shown in FIGS. 6 and 7. Needless to say, this method can also be applied when welding inside the hole 21.

Effects of the Invention As described above, the present invention provides a ventilation groove that serves as a passage for inert gas in a portion located on the outer periphery of the aperture on the frame surface, and connects the inner circumferential surface of the aperture with the member constituting the lining. Since inert gas is supplied through the ventilation groove into the gap formed between the two, when welding each member constituting the lining,
The air in the space can be replaced by an inert gas. Therefore, the welding operation described above can be performed in an inert gas atmosphere, and oxidation due to oxygen can be prevented during welding, so that a good welded part can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the main parts of a frame having a lining of a plate heat exchanger according to the present invention;
FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a front view showing a conventional example of a frame having a lining.
Figure 4 is a sectional view taken along the - line in Figure 3, and Figure 5 is a cross-sectional view of Figure 4.
A sectional view showing a welded state of the lining shown in the figure, and FIGS. 6 to 8 are sectional views showing other examples of the lining installed in the opening of the frame. 20...Frame, 21...Opening hole, 23a, 2
3b...Vent groove, l...Between, 4...Lining, 5a, 5b...Cylinder body, 6a, 6b...Flange.

Claims (1)

[Scope of utility model registration request] A plurality of members constituting the lining are placed in the openings drilled in the frame of the plate heat exchanger that serve as inlet holes or outlet holes for the heat exchange medium, and each member is welded within the openings. In what is to be joined, a member having one end opening on the outer side of the frame and the other end forming the inner circumferential surface of the opening and the lining at a portion located on the outer periphery of the opening on the frame surface. 1. A plate heat exchanger, characterized in that a ventilation groove is provided in the space formed between the space and the space for supplying an inert gas into the space.