JPH0756434B2 - Plate heat exchanger - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate heat exchanger, and more particularly to a plate heat exchanger having a heat transfer plate provided with a gasket groove into which a sealing gasket is fitted.

A plate heat exchanger comprises a plurality of corrugated heat transfer plates clamped between a fixed frame and a movable frame. The corrugated heat transfer plate with a gasket is a horizontal guide
It hangs vertically from the bar. To prevent the gasket from falling off the vertical corrugated heat transfer plate during assembly and disassembly, prior to installing the heat transfer plate on the guide bar,
The gasket must be attached securely.

[0003]

BACKGROUND OF THE INVENTION Generally speaking, there are two types of heat transfer plates for heat exchangers. In one of those types,
An adhesive is used to hold the gasket in the gasket groove. In another type, no adhesive is used to hold the gasket in the gasket groove. An example of the latter is shown in U.S. Pat. No. 4,377,204.

[0004]

SUMMARY OF THE INVENTION A first object of the present invention is a corrugated heat exchanger provided with a corrugated heat transfer plate of a type that does not use an adhesive to hold a gasket in a gasket groove. The object is to provide a gasket that does not fall off from the vertical corrugated heat transfer plate when disassembled.

A second object of the present invention is to provide a plate heat exchanger as described above, which can be manufactured at a low cost. A third object of the present invention is to provide a plate heat exchanger in which the corrugated heat transfer plate according to the present invention can be used in combination with a conventional heat transfer plate that holds a gasket with an adhesive. is there.

A fourth object of the present invention is to provide a method of forming a hole in the outer side wall of the gasket groove of the corrugated heat transfer plate.

[0007]

In order to achieve the above object, in the plate heat exchanger of the present invention, the gasket is integrally formed with a tab having a thickness gradually decreasing toward the tip, The tab is to be fitted to the outer side wall of the gasket groove of the heat transfer plate.

A long gasket groove is provided at a position slightly inserted from the edge of the heat transfer plate according to the present invention. Holes are provided in the outer sidewall of the gasket groove. A gasket made of a flexible and compressible material has a long body portion that fits into the groove. In order to connect this gasket to the corrugated heat transfer member without using an adhesive, a tab that is formed integrally with the main body part and gradually decreases in thickness as it goes to the tip is tightened with the edge of the hole. Insert it in the proper condition. To insert the tab into the hole, the gasket may be moved laterally or depressed.

The above holes may be formed by using a punching die before the smooth metal plate is used as the heat transfer plate.

[0010]

In order to form the plate heat exchanger according to the present invention, a plurality of heat transfer plates having the above gaskets may be clamped between the fixed frame and the movable frame. Also, by combining the heat transfer plate with the gasket as described above and the heat transfer plate with the gasket using the adhesive,
A plate heat exchanger can be formed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The gasket 1 shown in FIGS. 1-7 is made of a flexible and compressible material and has an elongated body portion 2 with an integrally formed tab 3. The tabs 3 are formed at regular intervals in the longitudinal direction of the gasket, and project laterally from the body portion 2 of the gasket on the side opposite to the heat transfer surface of the heat transfer plate to be sealed. There is. The bottom surface 4 (FIG. 7) of the tab 3 is preferably horizontal and smooth and coplanar or flush with the smooth horizontal close contact surface 5 which is the bottom surface of the body portion 2.

The heat transfer plate 6 (which is preferably a metal or a material having a relatively large rigidity similar to that of the metal) is provided with a long groove 7 along the entire circumference of the heat transfer plate and the heat transfer plate. When a port hole is provided in the board, it is provided along the port hole. Since the close heat transfer surface is provided on the inside of the gasket, that is, on the side opposite to the edge 9 of the heat transfer plate, the lower surface 5 of the main body portion 2 of the gasket has the bottom 8 of the groove.
It fits in the groove 7 so as to be in close contact with. Further, the main body portion 2 of the gasket has a smooth close contact surface 10 on the upper surface which comes into close contact with the heat transfer plate located on the front surface thereof.

The groove 7 is provided at a position slightly inward from the edge 9 of the heat transfer plate, and is depressed more than the peripheral portion 11 between the groove 7 and the edge of the heat transfer plate. The groove 7 comprises an inner side wall 12 and an outer side wall 13 which are open upwards. The outer sidewall 13 of the groove has a serpentine corrugation, as seen in FIG. 5, thereby forming an extension 14 of the groove 7. The expanded portion 14 cuts into the peripheral portion 11, and the bottom surface thereof is flush with the bottom surface of the groove 7. One of the purposes of corrugating the outer side wall of the groove 7 is to strengthen the heat transfer plate.
The peripheral portion 11 between the adjacent extended portions 14 is an inward portion 15 that is inwardly intruded from the edge of the heat transfer plate.

On the outer side wall of the groove 7, holes 16 of the same shape are formed at a portion in contact with the indented portion 15 at regular intervals in the longitudinal direction of the groove. As shown in FIG. 5, it is desirable that the hole 16 be slightly elliptical. Hole 16 is the outer sidewall
Range from a vertical edge 17 facing outward in the lateral direction at a portion where 13 contacts the bottom surface of the groove 7 to a vertical edge 18 facing laterally inward at a portion where the outer side wall 13 contacts the peripheral portion 11. It extends. The holes 16 are provided at the same spacing as the tabs 3 to receive the tabs 3 when the gasket body portion 2 is fitted into the groove 7.

The holes 16 may be formed by cutting or may be formed by using a punching die before the smooth plate material is formed into a heat transfer plate by molding.
The holes 16 may be formed by punching or cutting after forming the heat transfer plate. In any case, the holes 16 should not be formed beyond the upper and lower edges of the outer side wall 13 of the gasket groove 7.

The tab 3 is an elongated member having a bottom surface 4 as well as side surfaces 19 and 20 on both sides and a top surface 21. Side 19
Desirably, and 20 are on a plane perpendicular to the longitudinal centerline of the body portion 2 of the gasket. Top 21
Is laterally outward from the body,
The distance from the bottom surface 4 is reduced. The vertical thickness of the tab near the body portion 2 of the gasket (ie the top surface)
The distance between 21 and the bottom surface 4) is greater than the height of the hole 16. At the tip of the tab, the vertical thickness of the tab is less than the height of the hole 16. Insert the tab 3 into the hole 16 and pull it out from under the outer edge of the heat transfer plate. As shown in FIG. 7, the thickness of the tab 3 at the contact point is slightly larger than the height of the hole.
Therefore, the tab 3 is in an interference fit and the edge of the hole
It can be said that it is slightly compressed at 17 and 18. The width of the tab 3 may be such that there is some clearance between the side surfaces 19, 20 on both sides of the tab 3 (as shown in FIG. 6) and the side edges 22, 23 of the hole 16, or , The side edge of the hole 22,
It may be a tight fit with 23.

The hole 16 is not a blind hole and nothing prevents the insertion of the tab 3. To attach the gasket 1 to the heat transfer plate 6, align the tabs 3 with the holes 16 and fit the body portion 2 into the groove 7. The body portion is then moved laterally to insert the tab into the hole, either manually or with a tool. The tabs are flexible and compressible so that they will be distorted and compressed into the holes. If all the tabs are pushed into the holes in this way, the assembly work is completed. If desired, the tab may be grasped and pulled out from under the heat transfer plate in order to fully attach the tab and completely fit the body portion 2 of the gasket into the groove 7.

The gasket 1 shown in FIG. 8 has a tab 25 in which the shape of the tab is partially changed. Tab 25
Are formed at regular intervals in the longitudinal direction of the gasket, and project laterally from the body portion 2 of the gasket 1 on the side opposite to the heat transfer surface of the heat transfer plate to be sealed. 1 shows one of a plurality of tabs (which replaces the above-mentioned tab 3) integrally formed with the gasket. The bottom surface 26 of this tab is also preferably flush with the bottom surface 5 of the body portion 2 of the gasket. The top surface 27 of this tab is preferably parallel to the bottom surface 26, and the distance between it and the bottom surface is such that the top surface of the bottom 8 of the groove 7 of the heat transfer plate 6 and the peripheral portion 11 are separated.
Equal to the distance to the top surface of the. The relationship between each such surface is clearly shown in FIG. In FIG. 9, the gasket is completely fitted into the groove of the heat transfer plate 6 with the tab completely fitted in one of the holes 16. In the state of FIG. 9, neither the body portion of the gasket nor the tab is in such a compressed state.

The tab 25 has a protrusion 28 protruding outward. Between the bottom surface of the protrusion 28 and the bottom surface 26 of the tab,
There is a vertical step 30 that faces inward in the lateral direction. Figure 9
When the tabs are fully seated as shown in, the step 30 will
Close to edge 17 of 16.

The top surface 29 of the protrusion 28 is preferably parallel to the bottom surface 26 and top surface 27 of the tab. Top surface 29 of protrusion 28
Between the tab and the top surface of the tab, there is a vertical step 31 facing outward in the lateral direction. When the tab is fully inserted as shown in FIG. 9, the step 31 is in close contact with the hole edge 18 and the top surface 29 of the protrusion is in close contact with the lower surface of the peripheral portion 11.

The gasket having the tabs shown in FIGS. 8 and 9 is prepared by first aligning the tabs 25 with the holes 16 and fitting the body portion 2 of the gasket into the groove 7 of the heat transfer plate. , Attached to the heat transfer plate 6. The body portion is then moved laterally to insert the tab into the hole, either manually or with a tool. Pushing all the tabs into the holes in this way, the step 30 should be flush with the edges of the holes 16 as shown in FIG.
Close the tabs so that they are in close contact with 17, and attach the step 31 to the edge of the hole.
The assembly work is completed when the tab is closely attached and it is confirmed that the tab is completely inserted. The width of the tab is preferably narrower than the width between the side edges 22,23 of the hole 16.

The tab 25 'integrally formed with the gasket 1 shown in FIG. 10 is similar to the tab 25 shown in FIGS. 8 and 9, but goes beyond the tip of the protrusion 28 to the outside. The difference is that it comprises a triangular monolithic extension 32 such that the sides 33 and 34 approach each other. The extension of this triangle is generally horizontal and has a step
It is located underneath 31 and has corners 35 and 36 in a longitudinal position in the longitudinal direction of the gasket. Corner 35 and
The tabs 36 project more outward than the side surfaces on both sides of the tab.
The distance between the corner portion 35 and the corner portion 36 is larger than the distance between the side edge 22 and the side edge 23 of the hole 16 of the heat transfer plate 6, so when the tab is completely fitted into the hole, These corners serve as a stopper. That is, the stepped portion 30 is brought into close contact with the edge 17 of the hole,
Tab 25 'until the step 31 is flush against the edge 18 of the hole.
When is completely fitted into the hole, the corner portion of the extension portion elastically deformed when passing through the hole returns to a state where no stress is applied after passing, so that it can serve as a retainer.

The tab 25 "integrally formed with the gasket shown in FIG. 11 is generally similar to the tab 25 shown in FIGS. 8 and 9, except that the tab is grasped at the bottom of the heat transfer plate. It is different in that it is provided with an extension protrusion 28 'to facilitate the task of pulling it out of the door and putting the tab fully inserted into the hole 16. The tabs 25 and 25' are rather long in their own right, Although it is suitable for grasping the protrusion 28 and pulling it out from under the heat transfer plate so that the tab is completely inserted in the hole, the extended protrusion 28 'shown in FIG. 11 makes this work easier. Let's train.

The gasket 1 shown in FIG. 12 is integrally formed with a tab whose shape is partially changed. Figure 12
The tab 40 shown in has a long cylindrical body. The main body may have a circular cross section, or may have an elliptical shape because the hole 16 of the heat transfer plate 6 is generally elliptical.
The tab 40 projects horizontally in the lateral direction and its bottom surface is generally flush with the lower surface 5 of the body portion 2 of the gasket. The end of this tab is almost vertical and is generally vertical.
It is 41. A button-shaped extension portion 42 is integrally formed on the end surface 41. The extension 42 also has a generally vertical end surface 43. Although these end faces 41 and 43 are almost vertical, it is desirable that they are slightly inclined upward as shown in FIG. The size and shape of the button-shaped extension portion 42 is approximately the same as or slightly smaller than the size and shape of the hole 16 of the heat transfer plate 6. The button-shaped extension is smaller than the tab. Therefore, the bottom surface of the extension is substantially flush with the bottom surface of the tab, but the top surface of the extension is lower than the top surface of the tab. Since the end surface of the button-shaped extension portion 42 is inclined, when the body portion 2 of the gasket is fitted into the groove 7 and downward pressure is applied to the tab 40, the button-shaped extension portion is easily fitted into the hole. . That is, when inserting the tab with the button-shaped extension into the hole, there is little lateral movement of the gasket. Of course, as shown in FIG. 13, tab 40
The body portion of the at least partially fits into the hole. However, the upper edge of the button-shaped extension only fits under the upper edge of the hole. With the tab inserted in the hole, the end surface 41 located at the top of the button-shaped extension contacts the upper edge of the hole.

FIG. 14 shows a heat transfer plate 6'as a modified example.
The cross section of is shown. The holes 16 'of the heat transfer plate are not formed by removing the metal in the relevant portion,
The metal is cut along the three sides of the hole to be formed, that is, the side to be the upper edge of the hole and the side edges on both sides. It is formed by bending it so that it becomes an extension of 8'and making it horizontal. The gasket tabs shown in Figures 1 and 12 are
It can be easily inserted into the hole of the heat transfer plate according to the modified example shown in FIG.

In the gasket shown in FIG. 15, recesses 50 are formed at regular intervals in the longitudinal direction of the main body portion 2 instead of the tabs. The concave portions are side surfaces 51 and 52 formed so as to form a right angle with the longitudinal centerline of the main body portion 2.
It has a vertical back surface 53 and a horizontal bottom surface 54 that are formed parallel to the center line. The holes 16 "are not formed by removing the metal on that portion of the sidewall of the groove, but by cutting the metal along the three sides of the hole that is to be formed, then using a generally rectangular tab 56. In order to form the
The heat transfer plate 6 ″ is the same as the heat transfer plate 6 ″ except that it is formed by bending it so that it is flush with the heat transfer plate 11.
It is almost the same. The hole 16 ″ is otherwise the same as the hole 16 of the heat transfer plate 6. The hole 16 ″ and the tab 56 are formed at the same distance as the recess 50 of the gasket, and the side wall of the groove is It is formed in a portion in contact with the entrance portion 15.

FIG. 18 shows a state in which a gasket is attached. In this state, the tab 56 fits in the recess 50 of the gasket and is in close contact with the bottom surface 54 of the recess. This gasket must be allowed to move downward and slightly laterally in order to be completely fitted in the groove of the heat transfer plate as shown in FIG. The beveled lower surface 57 of the body portion 2 of the gasket helps to help clear the edges of the tabs when fitting the gasket into the groove. The body portion 2 of the gasket fits under the tab 56, but not the hole 16 ".

Some of the gaskets described above may be called push gaskets. For example, the gaskets of Figures 8-13, 15 and 18 may be considered push gaskets. All the gaskets described above are gaskets that do not use an adhesive.

[0029]

As described above, in the present invention, the gasket is provided with the tab integrally formed, and the tab fits into the hole provided on the outer side wall of the groove of the heat transfer plate. No fixing means are required to keep it attached to the hot plate.

[Brief description of drawings]

FIG. 1 is an isometric view of a portion of a gasket according to the present invention showing one of a plurality of tabs integrally formed with the gasket at regular intervals in the longitudinal direction of the gasket. Is.

FIG. 2 is an isometric view showing a part of a heat transfer plate according to the present invention.

3 is a view of a part of the heat transfer plate shown in FIG. 2 viewed from the side opposite to FIG.

4 is a cross-sectional view taken along the line IV-IV in FIG. 2, showing a hole formed in the outer side wall of the gasket groove of the heat transfer plate.

FIG. 5 is a partial plan view of the heat transfer plate, showing holes formed in the outer side wall of the gasket groove.

FIG. 6 is a partial plan view of the heat transfer plate, showing a state in which a gasket is fitted in a groove and a tab is inserted into a hole on an outer side wall of the groove.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a diagram showing a first modification of the tab of the gasket.

9 is a sectional view similar to FIG. 7, showing the tab of FIG. 8 completely inserted into the hole of the heat transfer plate of FIG. 2;

FIG. 10 is a view showing a second modified example of the tab of the gasket.

FIG. 11 is a view showing a third modified example of the tab of the gasket.

FIG. 12 is a diagram showing a fourth modification (push-in type) of the tab.

FIG. 13 is a cross-sectional view similar to FIG. 7, showing a state in which the tab of FIG. 12 is inserted into the hole of the heat transfer plate.

14 is a cross-sectional view taken along the same cross-section as FIG. 4, showing FIG.
13 shows a modification of the heat transfer plate for attaching the tab of the gasket shown in FIG.

FIG. 15 is an isometric view showing a part of a gasket according to another embodiment of the present invention.

[Fig. 16] For mounting the gasket shown in Fig. 15,
It is an isometric view which showed a part of another modification of a heat transfer plate.

FIG. 17 is a view of a part of the heat transfer plate shown in FIG. 16 seen from the side opposite to FIG. 16.

18 is a sectional view taken along line XVIII-XVIII in FIG. 16.

[Explanation of symbols]

 1 gasket 2 body part 3 tab 6 heat transfer plate 7 groove 11 peripheral part 12 inner side wall 13 outer side wall 16 hole

Claims (19)

[Claims] 1. A long groove is provided at a position slightly intruding from the edge of the heat transfer plate, and the groove is depressed more than the peripheral portion between the groove and the edge of the heat transfer plate. The groove has a bottom, an inner side wall and an outer side wall, and a plurality of holes are formed in the outer side wall, and these holes are arranged at regular intervals in the longitudinal direction of the groove. A gasket made of a flexible and compressible material and having a long body portion fits into the groove, the gasket being formed integrally with the body portion into the hole. A tab to be fitted is provided, and since the tab completely fits the main body portion of the gasket into the groove, the side of the heat transfer plate opposite to the side where the groove is formed is provided. Hold it with your hand or tool and pull it out through the hole A plate-shaped heat exchanger characterized in that it projects sufficiently from the hole described above, and the tab gradually decreases in thickness as it goes to the tip, and becomes an interference fit with the edge of the hole. 2. Both side walls of the groove open upward from the bottom, and the hole has an upper edge at a portion where the outer side wall contacts the peripheral portion, and the outer side. The side wall has a lower edge where it contacts the bottom of the groove, and the tab has a top surface and a bottom surface that are inclined with respect to each other so that the thickness gradually decreases toward the tip. cage, interference fit described above, characterized in that occur between and the upper edge and the lower edge of the hole, with the top surface and said bottom surface of said tab plate of claim 1, wherein Type heat exchanger. 3. A long groove is provided at a position slightly intruding from the edge of the heat transfer plate, and the groove is depressed more than the peripheral portion between the groove and the edge of the heat transfer plate. The groove has a horizontal bottom, an inner side wall and an outer side wall, and a plurality of holes are formed in the outer side wall, and these holes are spaced at regular intervals in the longitudinal direction of the groove. A gasket made of a flexible and compressible material and having a long body portion fits in the groove, the gasket being formed integrally with the body portion A plate heat exchanger comprising a tab that fits into a hole, the thickness of the tab gradually decreasing toward the tip, and the tab becomes an interference fit with the edge of the hole. 4. Both side walls of the groove are open upward from the bottom, and the hole has an upper edge at a portion where the outer side wall contacts the peripheral portion, and the outer side. The side wall has a lower edge where it contacts the bottom of the groove, and the tab has a top surface and a bottom surface that are inclined with respect to each other so that the thickness gradually decreases toward the tip. A plate according to claim 3 , characterized in that the interference fit occurs between the upper and lower edges of the hole and the top and bottom surfaces of the tab. Type heat exchanger. 5. The body portion of the gasket has a bottom surface that contacts the bottom of the groove, and the bottom surface of the tab is smooth and horizontal, and is generally coplanar with the bottom surface of the body portion. The plate heat exchanger according to claim 4 . 6. A long groove is provided at a position slightly intruding from the edge of the heat transfer plate, and the groove is depressed more than the peripheral portion between the groove and the edge of the heat transfer plate, The groove comprises a bottom, an inner side wall and an outer side wall, which side walls open upwards from the bottom,
A plurality of holes are formed in the outer side wall, and these holes are formed at regular intervals in the longitudinal direction of the groove. A gasket made of a flexible and compressible material and having a long body portion, the upper edge being in contact with the upper edge and the lower edge being in contact with the bottom of the groove. The gasket has a tab formed integrally with the main body portion and fitted into the hole, the tab having a top surface and a bottom surface, and the tab is fitted with the hole described above. A plate heat exchanger, characterized in that, for holding, the bottom surface has a step portion in close contact with the lower edge of the hole. 7. The tab has a top surface with a second step that contacts the upper edge of the hole when the step contacts the lower edge of the hole. And claim 6
The plate heat exchanger described. 8. The tab is integrally formed therewith,
It has a laterally extending extension, which has side faces approaching each other as it goes outwards from the two corners, between the two corners. distance is greater than the width of the hole, when the tab is fitted completely above the hole, the two corners, characterized in that the mesh with said holes, according to claim 6, wherein Plate heat exchanger. 9. The plate heat exchanger according to claim 8 , wherein the extension portion of the tab has a substantially triangular shape. 10. The tab includes on its top surface a second step which contacts the upper edge of the hole when the step contacts the lower edge of the hole. And claim
9. The plate heat exchanger according to item 9 . 11. The tab is provided with an extension protrusion at its tip for grasping the tip of the tab and pulling it out from under the heat transfer plate to completely fit the body portion of the gasket into the groove. The plate heat exchanger according to claim 7 , wherein the extension protrusion has a length sufficient to project to the outside of the hole when the tab is inserted into the hole. 12. A long groove is provided at a position slightly intruding from the edge of the heat transfer plate, and the groove is depressed more than the peripheral portion between the groove and the edge of the heat transfer plate. The groove comprises a bottom and an inner side wall and an outer side wall which are open upwards and outwardly, the outer side wall being provided with a plurality of holes, which are formed in the groove. A gasket that is formed at regular intervals in the longitudinal direction, is made of a flexible and compressible material, and has a long body portion,
The gasket fits in the groove and the gasket comprises a tab formed integrally with the body part and at least partially fitted in the hole, the tab having a tip at the top edge of the hole. A plate heat exchanger having a button-shaped extension that fits underneath. 13. The hole is characterized in that the outer side wall has an upper edge at a portion contacting the peripheral portion, and the outer side wall has a lower edge at a portion contacting a bottom of the groove. 13. The plate heat exchanger according to claim 12 . 14. The button-shaped extension extends under the upper edge of the hole when the tab is pushed down to fit into the hole, as set forth in claim 12 . Plate heat exchanger. 15. The plate heat exchanger according to claim 14, wherein the size and the shape of the button-shaped extension portion substantially match the size and the shape of the hole. 16. The plate-type heat exchange device according to claim 15, wherein the tip of the tab has a portion on the button-shaped extension portion that contacts the upper edge of the hole. vessel. 17. A long groove is provided at a position slightly intruding from the edge of the heat transfer plate, and the groove is depressed more than the peripheral portion between the groove and the edge of the heat transfer plate, The groove has a bottom, an inner side wall and an outer side wall, and the outer side wall is formed with a plurality of tabs, the tabs being spaced apart in the longitudinal direction of the groove. A gasket made of a flexible and compressible material and having a long body portion fits in the groove, the body portion of the gasket having a recess for receiving the tab. A plate heat exchanger characterized in that 18. The tab is formed by cutting the material of the outer sidewall and bending the cut material upwardly toward the inner sidewall.
18. The plate heat exchanger according to claim 17. 19. The recess is formed in an upper portion of the main body portion along an outer edge of the main body portion, and when the main body portion is pushed down to fit into the groove, the recess is formed. 19. The plate heat exchanger according to claim 18, wherein, under the recess, the surface of the body portion is inclined upward and outward to facilitate clearing of the edge of the tab.