ES2429137T3 - Heat exchanger with profiled round heat exchanger plates - Google Patents

Abstract

Heat exchanger composed of round heat exchanger plates (2-2x) profiled with through holes to transfer heat between means of an equal or different state of aggregation, comprising - a package of plates (1) formed by at least two pairs of assembled heat exchanger plates (16,16a) that are composed of two heat exchanger plates (2-2x), welded respectively to the gas in the through holes, and two closing plates (19, 19a) with holes of passage for a medium circulating through the package of plates (1) that delimit on both sides the pairs of exchanger plates of assembled (16, 16a), the pairs of heat exchange plates (16, 16a) being welded tightly to the gas contiguous in each case and the delimiter closing plates (19, 19a) on the outer periphery to form an independent pressure chamber, and - a pressure-stable housing (21) with holes passage (25, 25a) arranged on the side of the wrapper for a second half that circulates through the plate package (1) located on the side of the wrapper and with front through holes (25, 25a) with connecting sleeves (23 , 23a) that can be welded to the opening holes of the closing plates (19, 19a), characterized in that - the plate package (1) is delimited on both sides by means of a package holding plate (3 or 3a) with holes of passages (20 or 20a), which has a diameter greater than the diameter of the plate package (1) and adapted to the inner diameter of the housing envelope (12); - the plate package (1) is secured by at least four clamping bolts (4-4x) that run in the periphery of the heat exchange plates (2-2x) and are welded to the package holding plates (3, 3a); - the fastening bolts (4, 4a or 4b, 4c) are positioned in the marginal area of a predetermined opening angle (a; a1), located on the side of the envelope, and there are additionally fixed one ovarian dividing elements wrap (10) in case of a multipass plate package (1); - the zones between the fastening bolts (4, 4b and 4a, 4c) are respectively covered with a chapalateral (6 or 6a) which is fixed on the adjacent fastening bolts (4, 4b; 4a, 4c) and has a shape adapted to the periphery of the heat exchanger plates (2-2x) of the plate package (1); - the side plates (6; 6a) are configured at the ends with U-bent parts (7, 7a) that are hermetically supported on the inner diameter of the housing envelope (12); - the opening angles (a; a1), located on the side of the envelope, are sealed by a metal seal (8) with respect to the areas of the plate package (1) covered with the side plates (6; 6a); and - the plate package (1) is housed in a stable position in the housing envelope (12) by means of the U-shaped parts (7, 7a) of the side plates (6, 6a) and the housing envelope (12) It is metallic closed tightly gas tight by means of end plates (13 or 13a) with connecting sleeves (23, 23a) that at the same time fix the plate package (1) laterally in the housing (21).

Description

Heat exchanger with profiled round heat exchanger plates.

The invention relates to a heat exchanger composed of profiled round heat exchanger plates with through holes for transferring heat between means of an equal or different state of aggregation, comprising a package of plates formed by at least two pairs of assembled heat exchanger plates that are composed of two heat exchanger plates, welded respectively gas tightly in the through holes, and two closing plates with through holes for a circulating medium to

10 through the package of plates that delimit on both sides the pairs of assembled heat exchanger plates, the adjacent heat exchange plate pairs being welded in gas-tight manner in each case and the delimiter closure plates on the outer periphery to form an independent pressure chamber, and comprises a pressure-stable housing with through holes arranged on the side of the wrapper for a second means that circulates on the side of the wrapper through the plate package and with

15 front through holes with connecting sleeves that can be welded to the through holes of the closing plates.

In this type of heat exchangers it is very problematic, as is already known, to supply the second means on the side of the envelope to the inside of the cylindrical housing to, on the one hand, largely avoid or even completely bypass flow between the plate pack and the inner wall of the cylindrical housing that would significantly reduce the efficiency of the heat exchanger and, on the other hand, set up an entry area on the side of the wrap that ensures maximum request as much as possible and uniform of the designed heat exchanger surface of the plate pack with the incoming medium on the side of the wrap.

25 In order to avoid as far as possible a shunt, it is known to provide adaptable guide plates between the outer contour of the plate package and the inner wall of the housing that press the rubber seals against the outer surface of the plate package and against the inner surface of the heat exchanger housing to seal the entrance area with respect to the remaining wrap surface of the plate package. On the one hand, the rubber seals can become brittle, break and, therefore, cause leaks under thermal conditions and, on the other

On the other hand, rubber seals are not suitable for all applications, for example, at high pressure and temperature ranges, in which this type of heat exchanger is preferably used.

From WO02 / 16852A1 a heat exchanger of the type mentioned at the beginning is known. In this case, in the periphery of the plate package, passage guides are provided for the incoming heat exchanger means 35 on the side of the envelope, which have an inner tubular structure of the housing and are partially attached to the plate package, at least two of the tubular structure passage guides that rest on the inner wall of the surrounding housing are disposed opposite to the package of plates. The areas of the passage guides, which have an inner tubular structure and configure the entrance and exit zone, are connected to tubes that engage the inlet and outlet sleeves of the surrounding housing, being sealed

At least one of the pipes against the inner wall of the inlet and / or outlet sleeve is metallic against leaks.

An inlet zone configured in this way on the side of the envelope prevents a branch between the inner wall of the housing and the plate package. However, if used at high pressure intervals, it is necessary that the areas of the passage guides, attached to the periphery of the plate package, rest on the inner wall of the housing with the help of additional measures to achieve a stability corresponding to the pressure in the heat exchanger. For this purpose, WO02 / 16852, for example, proposes to additionally fill these areas with a non-circulating heat exchanger medium. Due to their compact configuration, the passage guides, manufactured in this way, for the entrance area located on the side of the envelope can not be economically adapted in a variable way to each field of application and performance with a view to creating the premise that the maximum flow conditions in the inlet zone, located on the side of the casing, of the heat exchanger that are needed for a uniform solicitation of the plate package and, therefore, for each application always prevail Optimum utilization of the designed heat exchanger surface of the plate package. Therefore, if you want to achieve this goal through the guidelines

In accordance with WO02 / 16852, specific step guides have to be manufactured for each intended application. The manufacture of specific passage guides is, however, laborious from a technical point of view and therefore expensive.

From EP0760078B1 a plate heat exchanger is known which is composed of several plate modules assembled and fastened by means of fastening screws in a frame between separate frame plates and in which the adjacent outer heat exchanger plate of adjacent modules It is welded around the holes. A plate heat exchanger with this configuration is not suitable for the high pressure range or for the solicitation of the plate package on the side of the envelope.

5 A plate heat exchanger is known from EP0868642B1, in which the profiled and assembled heat exchanger plates are permanently welded to the through holes to form a plate package. In this regard, the plates are provided with at least one hole that forms in the welded plate package a channel for the fixing element, through which

10 extends a clamping screw that fixes the plate heat exchanger on a bearing element or on a fixing plate, while using the clamping screw to hold the welded plate package and thus compensate for the pressure differences generated. A plate heat exchanger with this configuration is also completely inadequate in the high pressure range and in a temperature range of -200 ° to + 900 °. In addition, the solicitation with a medium on the side of the envelope is impossible due to the complete realization

15 welded.

Therefore, it is an object of the present invention to improve the heat exchangers mentioned at the beginning by being able to economically manufacture the heat exchanger as a compact heat exchanger, metallic sealed and without wear, for the high pressure range and for a range of temperature from -200ºC to

20 + 900 ° C from standard prefabricated modules according to the intended applications and can be designed from the point of view of the fluid technique so that the designed heat exchanger surface is used to the maximum for thermal transfer during application of the plate pack on the side of the wrap.

This objective is achieved according to the invention because

-

 the plate package is delimited on both sides by a package holding plate with passage holes, which has a diameter greater than the diameter of the plate package and adapted to the inside diameter of the housing envelope;

30 - the plate package is secured by at least four fastening bolts that run on the periphery of the heat exchange plates and are welded to the package securing plates;

-

 the clamping bolts are positioned in the marginal area of a predetermined opening angle, located

on the side of the envelope, and in these one or more dividing elements of the envelope are additionally fixed in case of a multipass plate package;

-

 the areas between the fastening bolts outside the opening angle are respectively covered with a side plate that is fixed on the adjacent fastening bolts and has a shape adapted to the periphery of the heat exchanger plates of the plate package;

-

 the side plates are configured at the ends with U-bent parts that are hermetically supported on the inside diameter of the housing envelope;

-

 the opening angles, located on the side of the envelope, are sealed by a metal seal with respect to the areas of the plate package covered with the side plates; Y

-

 The plate package is housed in a stable position in the housing envelope by means of the U-bent parts of the side plates and the housing envelope is metal tightly sealed by gas by means of end plates with connecting sleeves which at the same time fix the side plate package

50 in the housing.

The innovative combination of features creates the premise that the heat exchanger can be economically designed from prefabricated standard modules such as a compact, metal-sealed and wear-free heat exchanger, both in a fully welded embodiment and with a metal sealed housing 55 and that it has a correct industrial application on a large scale, for example, in the refrigeration and air conditioning technique, the power plant technique, the domestic technique, the chemical process technique, etc., at a temperature service from -200ºC to + 900ºC. Due to the package clamping plates, which delimit on both sides the plate package consisting of pairs of heat exchange plates welded tightly to gas and closing plates, and which are welded together by means of the clamping bolts,

both the pressure inside the plate package and the pressure on the side of the casing are absorbed by the incoming medium, as well as possible pressure bumps generated by the temporary increase in pressure by means of the package clamping plates and the bolts of subjection. Therefore, the welded seams of joint and seal between the heat exchange plates and the closing plates are not essentially under pressure, of

5 so that the presence of leaks can also be excluded due to a rupture of welded seams caused by a permanent pressure load on the plate package or a possible increase in pressure, for example, unavoidable pressure shocks, if the exchanger of heat is used in a high pressure range.

As a result of the design of the opening angle of the entrance area, located on the side of the envelope,

10 by positioning the fastening bolts on the package securing plate that delimits the entrance area, and the metallic sealed coating of the remaining periphery of the plate package by the side plates, the premise is given that the area of entrance located on the side of the envelope can be adapted very economically to those optimal flow conditions of the envelope means that guarantee in case of the predetermined application a uniform solicitation of the package of plates by the side of the envelope and therefore , a

15 maximum utilization of the designed heat exchanger surface. In addition, the fastening of the plate package by means of the fastening bolts together with the U-bent part of the ends of the side cover plates, which are hermetically supported on the inner diameter of the housing envelope after assembly, simplifies much the assembly of the heat exchanger and, therefore, allows a very economic execution of the same. Rather, by hermetically sealed support of the U-bent parts of the plates

20 sideways in the inner diameter of the casing envelope are prevented at the same time bypass on the side of the casing and the plate package itself is placed in a stable position in the casing envelope.

According to a preferred embodiment of the invention, the metal joint of the opening angles, located on the side of the envelope, is made of a gauze-like metallic fabric that in the area between the bolts of

25 and under the side plates is tightly inserted in the form of strips in the recesses between adjacent pairs of heat exchange plates. This allows to effectively counteract the shunt of the side of the wrap on the periphery of the plate package and make the gasket with a sealing material, highly resistant to heat and chemicals, which is clearly fixed in position by the side plates .

According to another preferred embodiment of the invention, the sealed areas between the fastening bolts are evacuated in each case with respect to the opening angles, located on the side of the envelope, by means of a comb plate that is inserted into the grooves of the adjacent pairs of heat exchange plates and fixed on the fastening bolts along the fastening bolts, as well as resting on the inner wall of the

35 shell wrap. These comb plates advantageously have the comb shape adapted to the contour of the grooves between the pairs of heat exchange plates. By means of these comb plates, on the one hand, the sealing of the sealed grooves between two pairs of heat exchange plates in each case and the metal gasket inserted in the grooves is clearly maintained in the predetermined position with respect to the area of entry, so that bypass can also be effectively prevented

40 on the side of the envelope on the periphery of the plate package, if the incoming medium on the side of the envelope is a gaseous medium. On the other hand, in case of a corresponding width of the combs, additional support of the plate package can be created on the inner wall of the housing wrap and thus support the stable position of the plate package on the housing wrap.

According to another preferred embodiment of the invention, the package fastening plates are supported in the area between the fastening bolts, which is covered with the side plates, approximately in the diameter of the plate package.

Thus, after inserting the metal seals into the grooves between the adjacent pairs of plates

50 heat exchangers can be clearly fixed and locked both the side plates on the side on the supported part of the package securing plates and the combs adjacent to the fastening bolts before welding.

According to another preferred embodiment of the invention, each of the side plates is composed of two

55 partial side plates, one of the partial side plates having a rectilinear end partially covered flat by the other partial side plate which is provided with an end, configured in the form of Z, which is supported by the inner diameter of the envelope of Case. Through the two-part configuration of the side plates and the proposed arrangement on the covered periphery of the plate package, as well as the Z-shaped configuration of the free end of one of the two partial side plates that rests on the inner diameter of The housing wrap, the inserted metal gasket is completely covered and placed in a stable position on the covered periphery of the plate package, thus avoiding a shunt on the side of the wrap. This further creates the premise that it is possible to vary the width as a result of the design in two parts of the side plates, which allows adapting the side plates to the surface without problems

5 to be covered. Accordingly, the opening angle, located on the side of the envelope, of the inlet zone can be adapted exactly to the intended application of the heat exchanger during manufacturing only by the modified positioning of the anchoring bolts on the plates for securing the package in such a way that maximum solicitation occurs with the wrapping medium and the heat exchange surface designed for heat transfer is optimally utilized.

10 The maintenance-free heat exchanger design makes it possible for the housing wrap to be advantageously welded to the end plates. A compact, gas-tight and fully welded heat exchanger is thus made available, in which the presence of leaks and leaks can be completely excluded.

Naturally, if necessary, one of the end plates can also be welded to the housing wrap and one of the end plates can be attached to the housing wrap in a removable and gas-tight manner. However, in this case it is recommended that the separable joint between the end plate and the casing shell be metal sealed.

Other details of the invention are derived from the following detailed description and the accompanying drawings, in which preferred embodiments are represented.

In the drawings they show:

Fig. 1 a schematic representation of a heat exchanger, fully welded, with two connecting sleeves on the side of the plates and two wrap sleeves;

Fig. 2 a schematic representation of a package of plates, partially in section, with fastening bolts and fastening plate in the front view;

Fig. 3 a schematic section A-A of figure 1;

Fig. 4 a schematic representation of a partially interrupted view B of Figure 3;

35 Fig. 5 a schematic representation of a package holding plate in the side view with a closed side plate and a side plate designed in two parts.

The heat exchanger is essentially composed of a plate package 1 with closure plates 19, 19a,

40 pack clamp plates 3, 3a, clamp bolts 4-4x, side plates 6, 6a or partial side plates 6b, 6c and 6d, 6e, combs 5-5c, metal seals 11 and the housing wrap 12 with the two end plates 13, 13a, as well as at least two wrap sleeves 14, 14a, fixed on the housing wrap 12, and at least two connecting sleeves 23, 23a on the side of the plates that are fixed on the end plates 13, 13a.

In the embodiment shown, the housing 21 is a fully welded pressure vessel, which is formed from the housing envelope 12 and the two end plates 13; 13a with through holes 25; 25a gas tightly welded on the contour with the housing wrap 12. In the passage hole 25 of the end plate 13 the connecting sleeve 23 is provided on the side of the plates and in the passage hole 25a of the plate extreme

50 13a, the connecting sleeve 23a is provided on the side of the plates, which respectively pass through the end plates 13; 13a and the package holding plate 3, 3a and are joined in the contour with the end plate 13; 13a.

Through holes 12 are provided through holes 15; 15a on the side of the envelope, in which 55 the gasket sleeves 14 are welded tightly to the gas; 14a for the wrapping medium.

The plate package 1 is composed of a plurality of 2-2x heat exchange plates, round, profiled and assembled together that were determined for the intended application from the thermotechnical point of view, as well as being composed of closing plates 19, 19a that close the plate package 1 in the

extremes

The 2-2x heat exchanger plates are gas tightly welded in the contour of the through holes to form pairs of heat exchanger plates 16; 16th The pairs of heat exchanger plates 16; 16a, contiguous in each case, are gas-tightly welded together with the closing plates 19; 19a, which close, on the outer periphery.

The closing plates 19; 19a are configured with through holes that together with the through holes of the heat exchanger plates 2-2x configure the passageways 24; 24a through the plate package 1. In

10 the through holes of the closing plates 19; 19a the ends of the connecting sleeves 23, 23a on the side of the plates, which pass through the package holding plate 3, are welded tightly to the gas; 3a and the end plate 13; 13a of the housing 21.

The plate package 1 is delimited on both sides by the package retaining plates 3; 3rd with holes

15 of step 20; 20a, which are fastened by 4-4x fastening screws. The 4-4x clamping screws run adjacent to the periphery of the plate pack 1 and are welded on both sides in pack clamp plates 3; 3a based on a predetermined clamping of the plate pack with the pack clamping plates 3; 3rd.

As Figure 3 shows, the clamping bolts 4, 4b or the clamping bolts 4a, 4c are positioned in the

20 pack clamping plates 3; 3a in the extreme areas of the opening angles α; α1 of the entrance area, located on the side of the wrapper, of the plate pack 1 for the wrapping medium. Therefore, the opening angles α; α1 on the side of the envelope can be adapted economically and individually to the planned performance and to the conditions related to the technique of the media of the envelope used in a heat exchanger before welding the fastening bolts 4, 4b and 4a, 4c. As a result of this the

The premise that the corresponding available wrapping surface of the plate pack 1 is uniformly requested by the wrapping means, which allows each heat exchanger to be designed for its particular application such that optimum utilization of the heat exchanger surface of designed heat of the package of plates 1 from the thermotechnical point of view.

30 The fastening bolts 4d, 4e, which run on the periphery of the plate package 1, are displaced 90 ° from the center of the opening angles α; α1 and the 4f-4x clamping bolts are located in the area of the opening angles α, α1 and welded on the package clamping plates 3; 3a in order to continue stabilizing the plate package 1. In this special case, the fastening bolts 4f; 4x are rectangular and are used simultaneously to fix the rectilinear end 18 of the partial side plate 6c; 6f on the periphery of the package

35 of plates 1.

The areas on the periphery of the plate package 1, located between the fastening bolts 4, 4b and 4a, 4c, are metallic sealed with respect to the opening angles α; α1 of the entrance area of the envelope side to prevent a diversion of the envelope side at the periphery of the plate package 1. For this purpose, in the grooves

40 22 between pairs of adjacent heat exchange plates 16, 16a respectively are tightly inserted metal seals 8 in the form of strips that are preferably made of a gauze-like metal fabric and extend over the entire area between the fastening bolts 4, 4b or 4a, 4c.

The metal seals 8 are located in a stable position with respect to the opening angles α; α1 of the zone

45 of entry of the side of the envelope by means of comb plates 5, 5a or 5b, 5c that engage in the recesses 22 of the adjacent pairs of heat exchange plates 16, 16a and extend along the package of plates 1. These comb plates 5; 5th; 5b; 5c run on the opposite side of the opening angles α; α1 in parallel to clamping bolts 4; 4th; 4b; 4c and are welded on the fastening bolts 4; 4th; 4b; 4c.

50 The combs of the comb plates 5; 5th; 5b; 5c are advantageously configured with a contour corresponding to the shape of the recesses 22. Therefore, the comb plates 5-5c support at the same time the sealing of the entrance area of the envelope side. The comb plates 5-5c are advantageously designed with a width such that after mounting the heat exchanger they rest on the inner wall of the housing 21. This further improves the pressure-stable position of the plate package 1 in the housing 21.

55 The area between the fastening bolts 4, 4b and 4a, 4c and along the plate package 1, sealed with the metal seals 8 inserted in the recesses 22, is covered with partial side plates 6b, 6c or 6d, 6e, as shown in figure 5 on the left side, or with side plates 6; 6a in the form of a single piece, as shown in Figure 5 on the right side, which are welded in the fastening bolts 4; 4th; 4b; 4c and stably position the metal seals 8 in the recesses 22 between the adjacent pairs of heat exchange plates 16, 16a on the side of the casing also in case of high pressures.

The end, adjacent to the fastening bolts 4; 4th; 4b; 4c, of the side plates 6; 6th or side plates

5 partial 6b; 6c; 6d; 6e is configured with congruent angled U-shaped parts 7, 7a or 7b, 7c which, after mounting, are tightly supported on the inner wall of the housing casing 12. By means of these U-bent parts 7, 7a or 7b, 7c of the side plates 6, 6a or the partial side plates 6b-6e, the plate package 1 is placed in a stable position in the housing 21 and stabilized with respect to the pressure, and at the same time, the metal seals 8 in the grooves 22 are requested under pressure by means of the side plates 6, 6a or the plates

10 partial sides 6b-6e and, therefore, pressurized tightly into the grooves 22.

As Figure 3 and Figure 5 show on the left side, the partial side plates 6c and 6e are configured in each case with a rectilinear end 18 covered by the fastening bolts 4f; 4x and partially by a partial side plate 6d; 6b provided with an end 17 configured in the form of Z. The end 17, configured in the form of Z, of the partial side plates 6d; 6b is separated from the plate package 1 here in such a way that after mounting it is hermetically supported on the inner wall of the housing envelope 12 and thus configures another support point of the plate package 1 on the inner wall of the housing envelope 12, which once again improves the position stability and the pressure stability of the plate package 1. As a result of the configuration of the partial side plates 6d, 6e or 6b, 6c, specifically of a of the two side plates

20 partial 6d; 6e or 6b; 6c, which interact, with a rectilinear end 18 that is covered with the other partial side plate 6d; 6c or 6b; 6c, the partial side plates 6d, 6e or 6b, 6c can be individually adapted to the area to be covered and defined by the selected opening angle α, α1 of the entrance area located on the side of the envelope.

25 As can be seen in Figure 3 and as indicated in Figure 2, the described embodiment of the heat exchanger has a multi-step design. For this purpose, a metal plate-passing element 9 is inserted in the passage channel 24a of the plate package 1 and a metal wrapping element 10 is inserted on the side of the wrapping. The metal wrapping element 10 is wrapped grooved on the side directed towards the plate package 1 and arranged at the junction point of two pairs of heat exchanger plates 16, 16a and

30 sealed by the metal seals 6 inserted in the recesses 22 of the adjacent pairs of heat exchanger plates 16, 16a in the contour of the plate pack 1 and hermetically fixed on the side of the envelope with respect to the inner wall of the housing wrap 12 with a metal seal 11.

The heat exchanger, proposed according to the invention and sealed completely by metal, does not require almost

35 maintenance and, therefore, is suitable for compact construction with a completely welded design in the range of pressures and high temperatures. Due to the special embodiment, it can also be economically designed from standard prefabricated modules for each individual application in order to take advantage of the designed heat exchanger surface optimally.

Claims (7)

1. Heat exchanger composed of profiled round heat exchanger plates (2-2x) with through holes for transferring heat between means of an equal or different state of aggregation, which comprises

-

 a package of plates (1) formed by at least two pairs of assembled heat exchanger plates (16, 16a) which are composed of two heat exchange plates (2-2x), welded respectively gas tightly in the holes of passage, and two closing plates (19, 19a) with holes for a medium

10 circulating through the package of plates (1) that delimit on both sides the pairs of assembled heat exchanger plates (16, 16a), the adjacent heat exchange plate pairs (16, 16a) being welded tightly to the gas in each case and the closing closing plates (19, 19a) on the outer periphery to form an independent pressure chamber, and 15 - a pressure-stable housing (21) with through holes (25, 25a) disposed on the side of the wrapper for a second means circulating through the plate pack (1) located on the side of the wrapper and with front through holes (25, 25a) with connecting sleeves (23, 23a) that can be welded to the through holes of the closing plates (19, 19a),  20 characterized because

-

 the plate package (1) is delimited on both sides by a package holding plate (3 or 3a) with through holes (20 or 20a), which has a diameter greater than the diameter of the plate package (1) and adapted to the inside diameter of the housing envelope (12);

-

 The plate package (1) is secured by at least four clamping bolts (4-4x) that run on the periphery of the heat exchanger plates (2-2x) and are welded to the package holding plates (3, 3a);

-

 the clamping bolts (4, 4a or 4b, 4c) are positioned in the marginal area of an opening angle

Predetermined (α; α1), located on the side of the envelope, and in these one or more wrapper dividing elements (10) are additionally fixed in case of a multipass plate package (1);

-

 the zones between the fastening bolts (4, 4b and 4a, 4c) are covered respectively with a sheet

side (6 or 6a) that is fixed on the adjacent fastening bolts (4, 4b; 4a, 4c) and has a shape adapted to the periphery of the heat exchange plates (2-2x) of the plate package (1 );

-

 the side plates (6; 6a) are configured at the ends with U-bent parts (7, 7a) that are hermetically supported on the inside diameter of the housing shell (12);

40 - the opening angles (α; α1), located on the side of the envelope, are sealed by a metal seal (8) with respect to the areas of the plate package (1) covered with the side plates (6; 6a) ; Y

-

 the plate package (1) is housed in a stable position in the housing envelope (12) by the U-bent parts (7, 7a) of the side plates (6, 6a) and the housing envelope (12) is metallic closed of

45 gas-tight manner by means of end plates (13 or 13a) with connecting sleeves (23, 23a) that at the same time fix the plate package (1) laterally in the housing (21). 2. Heat exchanger according to claim 1, characterized in that the metal seal (8) of the opening angles (α; α1), located on the side of the envelope, is made of a gauze-type metallic fabric 50 which in the area between the fastening bolts (4; 4b; 4a; 4c) is tightly inserted in the form of strips in the slits (22-22x) of adjacent pairs of heat exchange plates (16-16x) and covered with the side plates (6; 6a). 3. Heat exchanger according to claim 1 and 2, characterized in that the sealed areas between 55 the fastening bolts (4, 4b; 4a, 4c) are evacuated in each case with respect to the opening angles (α; α1), located on the side of the envelope, by means of a comb plate (5; 5a; 5b; 5c) which is inserted in the slits (22-22x) of the adjacent pairs of heat exchange plates (16-16x) and fixed in the clamping bolts (4; 4b; 4a; 4c) along the bolts of support (4; 4b; 4a; 4c). 4. Heat exchanger according to claim 3, characterized in that the comb plates (5, 5a, 5b, 5c) have a comb shape adapted to the contour of the slits (22-22x) between the pairs of heat exchange plates ( 16-16x). 5. Heat exchanger according to one of claims 1 to 4, characterized in that the package clamping plates (3, 3a) are supported in the area between the clamping bolts (4, 4b or 4a, 4c) approximately in the diameter of the plate package (1). 6. Heat exchanger according to one of claims 1 to 5, characterized in that the plates 10 sides (6; 6a) are composed of two partial side plates (6b, 6c or 6d, 6e), one of the partial side plates (6b or 6c or 6d or 6e) having a rectilinear end (18) partially covered in a manner flat by the other partial side plate (6b or 6c or 6d or 6e) that is provided with an end (17), configured in a Z-shape, which rests on the inner diameter of the housing envelope (12). Heat exchanger according to one of claims 1 to 6, characterized in that the housing casing (12) is welded on the end plates (13, 13a). 8. Heat exchanger according to one of claims 1 to 6, characterized in that one of the end plates (13; 13a) are welded in the housing envelope (12) and one of the end plates (13; 13a) is attached to the housing envelope (12) in a removable and gas-tight manner. 9. Heat exchanger according to claim 8, characterized in that the separable joint between the end plate (13 or 13a) and the housing envelope (12) is metallic sealed.