KR20110112815A - Heat accumulator - Google Patents

Abstract

The present invention relates to a regenerator (10) comprising a mass storage tank (12) for storing a storage medium (18), which is disposed on the ground when in use, the storage tank (12) having an inner tank (14) and An outer tank 16. The inner tank 14 is made of a temperature resistant thermoplastic and the outer tank 16 is made of a pressure resistant thermoplastic. A thermal insulation material is disposed in the gap between the inner tank 14 and the outer tank 16.

Description

Heat accumulator {HEAT ACCUMULATOR}

The present invention relates to a regenerator comprising a storage medium, in particular a large storage tank for storing hot water, and a method for producing said storage tank.

The operation of the heating device or the supply of hot water is often done by a regenerator. In principle, the heat accumulator can absorb heat from a heat source, such as a solar heating device, and store it for a long time. If necessary, the stored energy can be taken out of the regenerator again and used for example for heating.

DE 2005 037 997 A1 is known to have a heat accumulator comprising at least one storage tank disposed on the ground, which storage tank is formed of a pressure resistant material and is surrounded by a pressure resistant thermal insulation material.

The heat accumulator may be configured to include an inner tank, an outer tank and a thermal insulation disposed between the inner tank and the outer tank. The inner tank is formed to withstand the internal pressure caused by the storage medium contained in the regenerator. The thermal insulation is placed around the inner tank in a pressureless state. The outer tank used as thermal insulation and protective sleeve does not receive much of the internal pressure. Therefore almost all of the internal pressure is

 Are accepted. If the inner tank is made of plastic, the inner tank must have a very large wall thickness to have sufficient strength to withstand the internal pressure permanently. The higher the temperature of the storage medium stored in the regenerator, the greater the wall thickness required. From the long-term internal pressure diagram of the thermoplastic material, it can be seen that the reference voltage decreases with temperature over the time axis. At the same duration, the higher the temperature, the lower the reference voltage. Because of this, it is undesirable to have a large wall thickness of the required inner tank, because this increases the weight of the heat accumulator, which makes it difficult to handle, increases transport costs, and increases the cost due to increased material consumption. Is because the outer diameter is quite large. In order to use the regenerator at home, the outer diameter of the regenerator should preferably not exceed the normal door width of 79 cm. The large wall thickness thus reduces the inner diameter of the heat tank and also limits the maximum capacity of the regenerator.

An object of the present invention is to provide a large-capacity heat storage device which is cheap in construction and can be manufactured relatively simply, and which can efficiently store heat for a longer time.

This object is achieved by the features of claim 1. Preferred refinements of the invention are set forth in the dependent claims.

According to the invention, the mass storage tank of the regenerator comprises an inner tank and an outer tank, the inner tank is formed of a temperature resistant thermoplastic plastic, and the outer tank is formed of a pressure resistant thermoplastic plastic. A pressure resistant heat insulating material is arranged in the gap between the inner tank and the outer tank.

It is preferable when the wall thickness of the outer tank is larger than the wall thickness of the inner tank. It is particularly preferable when the outer tank, the inner tank and the thermal insulation material are formed such that the pressure applied to the heat storage is substantially received by the outer tank. This pressure applied to the regenerator is the internal pressure applied to the storage medium contained in the regenerator. As an alternative or in addition, external pressure may be applied to the regenerator. This is particularly the case when the heat accumulator is placed on the ground and not filled or only partially filled with storage media. Substantially the pressure is received by the outer tank and is not accommodated at all by the inner tank and the heat insulating material or only a small part, so that the sum of the wall thicknesses of the outer tank and the inner tank is less than when the pressure is received only by the inner tank. Everything is small. From the long-term internal pressure diagram of the thermoplastic material, it is provided that the lower the temperature, the smaller the wall thickness is needed to accommodate the uniform pressure. The inner tank has approximately the temperature of the storage medium, but since the outer tank has a room temperature or a temperature of the ground disposed therein, the sum of the required wall thicknesses is small. Due to the combined small wall thickness, the weight of the regenerator is reduced and the material cost is reduced. In this case, the material cost can be reduced by about 50%. In addition, this smaller wall thickness can be handled more simply in manufacturing techniques, and the reduced weight facilitates transport and the associated transport costs are reduced. In addition, the cooling time of the inner and outer tanks in the manufacturing process is reduced.

Also preferably, the plastic forming the outer tank is suitable for placement on the ground. This allows the heat accumulator to be placed on the ground in a space-saving manner.

A particular advantage of the heat accumulator according to the invention is that the storage tank can be produced particularly simply and inexpensively, since the production of a storage tank which can be formed of inexpensive thermoplastic plastic can be achieved with a blow molding method which can be carried out relatively simply. That can be.

In a preferred refinement of the invention, the storage tank is substantially in the form of a sphere, spheroid or cylinder. Preferably the sphere shape can be selected for use on the ground, since the sphere can expect minimal heat loss depending on the ratio of volume to surface, while at the same time the sphere can demonstrate high pressure resistance.

The heat resistant plastic of the inner tank is preferably polypropylene (PP) or polyethylene (PE), because the PP or PE has a heat resistance up to 95 ° C. when the inner tank is used to receive hot water, for example This is because the temperature is adjusted according to the conditions. This provides the advantage that the wall thickness of the inner tank can be chosen relatively thin in the manufacture of the inner tank, thereby saving material costs.

The pressure resistant plastic of the outer tank is preferably polyethylene (PE), duroplastic or glass fiber reinforced plastic (GFK).

The pressure resistant thermal insulation material of the intermediate layer between the outer tank and the inner tank is preferably a rigid blowing agent, in particular polyurethane (PU), since the polyurethane is adapted to the pressure conditions of the inner tank, which is 100 to 200 kPa.

In addition, the outer tank preferably comprises at least one first part and at least one second part. It is particularly preferred if the parts have a maximum dimension of less than 79 cm in one direction, for example if they each have a length of up to 79 cm. This allows parts of the outer tank to be carried through a standard door which is simply 79 cm wide. By the outer tank being composed of a plurality of parts, a larger capacity of the heat accumulator can be realized and nevertheless the heat accumulator can simply be carried into the inner space.

Another aspect of the invention relates to a method of manufacturing a mass storage member for storing thermal energy, in which the inner tank is produced by a blow molding process from thermoplastic plastics. In another blow molding process, an outer tank having a larger diameter than the inner tank is made of thermoplastic plastic. The outer tank is divided into at least two parts. The parts are arranged at predetermined intervals with respect to the outer surface of the inner tank with a gap therebetween. Subsequently the parts of the outer tank are joined together and the gap between the inner tank and the outer tank is filled with plastic foam material.

Another aspect of the invention relates to a method of manufacturing a large capacity storage tank for storing thermal energy, in which the inner tank is made of a thermoplastic plastic in a blow molding process, the diameter being larger than the inner tank in another blow molding process. At least two parts of the outer tank having the cylinder are made of thermoplastic plastic. On the inner side of the parts of the outer tank facing the inner tank in the assembled state, each layer is provided with a layer of plastic-foaming material in the foaming process, the layer having at least partly an intermediate region between the inner tank and the outer tank. It is dimensioned to be filled. Portions of the outer tank are joined to each other after being disposed around the inner tank.

Particular preference is given when the parts of the inner tank and the outer tank are each carried to a position where the storage tank should be installed and assembled there. This simplifies the transport of the heat accumulator or individual parts of the heat accumulator, which parts can simply be carried through the door or through another smaller opening.

The parts of the outer tank are preferably joined to each other by threaded connections consisting of at least one outer thread and at least one inner thread. The threads can simply be integrally formed together in the manufacture of the parts in a blow molding process. In addition, the screw coupling portion can be separated without damage when disassembling the heat accumulator.

As an alternative the parts of the outer tank can be joined to each other by a fixing ring.

The method claims relate to a manufacturing method for various products according to the invention, as defined by the structural and functional features in the claims. The above features can be considered to characterize manufacturing steps for examples of various products.

The invention is explained below in connection with the drawings with reference to the embodiments.

1 is a cross-sectional view schematically showing a heat accumulator disposed on the ground.
FIG. 2 is a cross-sectional view detailing the neck region of the heat accumulator according to FIG. 1. FIG.
3 is a sectional view schematically showing three heat storage devices of different capacities;
4 is a simplified illustration of a regenerator for use on the ground, according to a first embodiment of the invention;
5 is a simplified illustration of a regenerator for use on the ground, according to a second embodiment of the invention;
6 is a simplified illustration of a regenerator for use on the ground, according to a third embodiment of the present invention;
7 is a simplified illustration of a regenerator for use on the ground, according to a fourth embodiment of the invention.
8-10 illustrate an embodiment of a three layer wall structure for an inner tank.

1 shows a spherical heat accumulator 10 comprising an inner tank 14 and an outer tank 16 in a simple cross section. In this embodiment the storage tank 12 is disposed on the ground in use. The inner tank 14 is produced by a blow molding process and is formed of a temperature resistant thermoplastic plastic, preferably solid (such as non-foamable) polypropylene (PP). The inner tank 14 may be filled with hot water, for example the storage medium 18. The material of the inner tank 14 is chosen so that the durability of the material is ensured for the operating temperature of the storage medium 18, in this case hot water up to 95 ° C. The capacity of the storage tank 14 is approximately 3000 l in this embodiment, which corresponds to the diameter of the spherical storage tank 12 of approximately 2.10-2.20 m. The outer tank 12 is likewise formed of plastic. The size and weight of the storage tank 14 are suitable for transporting the cargo of the storage tank 14, for example via long lines in a cargo vehicle.

The outer tank 16, likewise produced by the blow molding method, is a pressure resistant thermoplastic, preferably solid polyethylene (PE), in order to achieve a sufficiently high resistance of the outer tank 16 to earth pressure on the ground acting from the outside. Is done. This achieves particularly high stability of the storage tank 12.

A gap 20 is formed between the inner tank 14 and the outer tank 16, which gap is filled with a pressure resistant heat insulating rigid blowing agent, preferably polyurethane (PU). The gap 20 is loaded by the pressure of the hot water 18 in the inner tank 14. The gap 20 is filled with a pressure resistant heat insulating rigid blowing agent, thereby minimizing the heat loss of the storage medium 18 in the inner tank 14, in which case the inner tank 14, simultaneously, of 100 to 200 kPa (approximately 10 to Compression of the gap 20 by the internal pressure of 20 orders) is prevented.

The storage tank 12 is closed in a compression-resistant manner by a pressure cover 22 made of steel, and the pressure cover 22 can be removed for management of the inner tank 14. The regenerator 10 is coupled to an energy delivery system (not shown), in which case the storage tank 12 is provided with a pipe 24 for the discharge of the storage medium 18 and the supply of the storage medium 18. Another pipe 40 is provided for this purpose. The assembly housing 26, for example formed of a plastic cylinder, is arranged in the neck region 28 of the storage tank 12, and the lower side of the housing is arranged in the outer tank 16. The housing can here be welded to the outer tank 16. This assembly housing 26 with insulation 30 is used to protect the armature (not shown) arranged in the assembly area for the connection 32 from precipitation and ground. The insulating portion 30 is made of a thermally insulating plastic material such as polyurethane (PU), and there is a heat conducting bridge in the region of the pressure cover 22 to prevent heat loss occurring in the region.

FIG. 2 shows the neck region 28 of the storage tank 12 according to FIG. 1 in a detailed sectional view. In this embodiment, a pipe penetration 34 is arranged in the neck 36 of the storage tank 12 for supply and / or discharge of the storage medium 18. The pipe 24 is connected to the inner wall of the inner tank 14 in the region of the pipe penetration 34 to improve the seal using the weld seam 44. The pipe 24 is flanged by the flange 46 in the region of the pipe penetration 34 of the outer tank 16. The retaining ring 42 is used to lock the pressure cover 22. The other cover 38 is arranged above the pressure cover 22. The cover 38 is made of thermally insulating plastic and is used to thermally insulate the storage tank 12 in the region of the pressure cover 22 formed of steel.

FIG. 3 shows three heat accumulators 10a, 10b, 10c in cross section, which are in this case distinguished by the different capacities of the respective inner tanks 14, in this embodiment 2000, 3000 or 4000. has a capacity of l. The first heat accumulator 10a having a capacity of 2000 l comprises a spherical inner tank 14a having a diameter of 1.60 m and a spherical outer tank 16a having a diameter of 1.80 m. The second heat accumulator 10b has a capacity of 3000 l and includes an inner tank 14b having a diameter of 1.80 m and an outer tank 16b having a diameter of 2.00 m. The third heat storage 10c having a capacity of 4000 l includes an inner tank 14c having a diameter of 2.00 m and an outer tank 16c having a diameter of 2.20 m.

Each inner tank 14 and each outer tank 16 of the spherical heat accumulator 10 is manufactured by the blow molding method as mentioned above.

The blow molding method is used to make each inner tank 14 or outer tank 16 from plastic. In this blow molding method, the plastic granules forming the base of the thermoplastic plastic are first melted in the extruder and the heated plastic hose is guided through the nozzle into the open blow molding tool. Subsequently the blow molding tool is closed and the plastic hose contained is inflated by compressed air and pressed against the contour of the blow molding tool. The cooling surface of the blow molding tool rapidly cools the plastic hose, in which case the plastic hardens to fit the shape of the blow molding tool. By changing the material thickness of the plastic hose, the wall thickness of the hollow body can be adjusted. At the end of the cooling process the hollow body can be removed from the blow molding tool.

As described above in the blow molding process, the inner tank 14 is made of thermoplastic plastic and in another blow molding process, the outer tank 16 is made of thermoplastic plastic, so that the storage tank 12 can be simply manufactured. In this case, the outer tank 16 has a larger diameter than the inner tank 14. The outer tank 16 is then divided into at least two parts, with the parts of the divided outer tanks 16 being arranged at predetermined intervals with respect to the outer surface of the inner tank 14, in this case of the outer tank 16. The parts are joined to each other by a welding process, and the gap 20 between the inner tank 14 and the outer tank 16 is filled with a plastic-foaming material.

In the blow molding process, different blow molds are needed for the production of the inner tank or the outer tank. The blow molds can be made relatively complicated and costly. The blow molding method can thus be developed such that the same blow mold is used for the production of multiple storage tanks having different capacities for the inner tank and the outer tank as required. The storage tank 10a according to FIG. 3 with a small capacity comprises an outer tank 16a, which is produced by a blow mold having an outer diameter of 1.80 m. To make the inner tank 14b from other plastic material, the same blow mold can be used for the storage tank 10b having a medium capacity. To produce the inner tank 14c, a blow mold for the outer tank 16b can be used for the storage tank 10c. In order to manufacture the three storage tanks 10a, 10b, 10c shown in FIG. 3, only six blow molds are needed, but only four. Since the diameter of the outer tank and the inner tank must be the same, the blow mold can be used once for the outer tank and once for the inner tank. In a similar manner, the blow mold can continue to be used for a larger number of storage tanks.

4 shows a simple cross-sectional view of a heat accumulator 50 according to a first embodiment of the invention for use on the ground. Members having the same configuration or the same function have the same reference numerals.

The regenerator 50 is used in particular in heating systems in connection with solar heating devices, heat pumps, solid fuel boilers, heating boilers and gas boilers. The regenerator 50 is filled with the storage medium 18. The problem of the heat storage device 50 is to store the heat of the storage medium 18 for as long as possible.

Like the specific heat accumulator 10 for use on the ground according to FIGS. 1 to 3, the ground heat accumulator 50 according to FIG. 4 is similarly blown with the internal tank 14 produced by the blow molding method. An outer tank 16 manufactured. The inner tank 14 is made of plastic, in particular polypropylene. The outer tank is made of thermoplastic plastics, in particular polyethylene, polypropylene or duro plastics. The diameter of the inner tank 14 is smaller than the inner diameter of the outer tank 16. As a result, the gap formed between the inner tank 14 and the outer tank 16 is filled with a pressure resistant heat insulating rigid foaming agent, preferably rigid polyurethane. By using plastic, the heat of the storage medium 18 can be stored for a long time. Since the thermal conductivity of the plastic is substantially lower than that of the metal material, the heat loss is low.

The outer tank 16 has an outer diameter of up to 79 cm as the largest dimension. Due to this, the heat accumulator 50 can be carried through a standard door having a width of 80 cm without any problem, so that the heat accumulator 50 can simply be mounted in a house, in particular a basement, without having to be divided into individual parts. Can be. The regenerator 50 has a capacity of about 400 l.

The bottom 15a of the inner tank 14 is formed in a hemispherical shape. In addition, the segment 15b in the opposite direction to the bottom 15 is also formed in a hemispherical shape, and the opening region of the inner tank 14 is formed in the segment. The intermediate region 15c between the bottom 15a and the segment 15b is formed in a cylindrical shape. Due to this structural shape of the inner tank 14, high pressure resistance is achieved. The outer tank 16 has approximately the same shape as the inner tank 14. Since the bottom 17 of the outer tank 16 is not fully hemispherical but flattened, the heat accumulator 50 can be safely erected with this flattened bottom down in use.

As an alternative, the inner tank 14 and the outer tank 16 can be formed completely hemispherical. This achieves a very high pressure resistance of the heat accumulator 50.

The heat accumulator 50 has a tank opening on the side opposite the bottom, which opening is pressure-tightly sealed by the pressure cover 58. The pressure cover 58 includes a plurality of openings 60, 62, through which the various components, in particular heat exchangers, temperature sensors, water pipes and / or discharge pipes can be inserted. In addition, the opening of the heat accumulator 50 and the pressure cover 58 are covered by the pot-type insulating hood 64. The insulating hood 64 comprises two members in the form of a half ring coupled with the insulating disk, which members surround the insulating disk. The insulating hood 64 is used to insulate the heat accumulator 50 while protecting the components inserted through the openings 60, 62.

The outer tank 16 comprises a first part 52 and a second part 54, which parts are fixedly coupled to one another via a weld connection 56. The weld connection 56 is preferably arranged in the cylindrical intermediate region of the outer tank 16.

Internal pressure is applied to the regenerator 50 by the storage medium 18. Due to the internal pressure, the heat accumulator 50 is subjected to a hoop stress. The internal pressure can in particular be accommodated by the inner tank 14, the outer tank 16 and the rigid foam insulation. From the long-term internal pressure diagram for the plastics used, the reference stresses that can be tolerated maximum at the desired operating temperature and the appropriate operating temperature of the parts can be measured. The parts are designed such that the hoop stress caused by the internal pressure is less than or equal to the reference stress measured. If the stress that actually appears is greater than the reference stress, then the desired sustained life at the operating temperature is not achieved. In order that the reference stress is not exceeded, the higher the internal pressure, the larger the wall thickness of each component should be selected. The smaller the reference stress, the higher the temperature of the part. The regenerator 50 is designed such that most of the stress caused by the internal pressure is absorbed by the outer tank 16. The outer tank 16 has a temperature corresponding substantially to room temperature, ie approximately 20 ° C. In contrast, the average temperature of the inner tank 14 is significantly higher due to the warm storage medium 18. If the temperature of the storage medium is 95 ° C, the average temperature of the inner tank 14 is 60 to 70 ° C. In order to withstand a uniform internal pressure, the outer tank 16 requires a significantly smaller wall thickness than the inner tank 14. The sum of the wall thickness of the inner tank 14 of the regenerator 50 and the wall thickness of the outer tank 16 is such that the inner tank and the outer tank in the regenerator where the stress caused by the inner pressure is substantially received by the inner tank. Is significantly less than the sum of the wall thicknesses. This saves up to 50% of the material. In addition, the heat accumulator 50 is thus lighter, so that it can be simply handled and carried inexpensively. In addition, the reduced wall thickness significantly reduces the cooling time in the blow molding process.

In the present invention, the wall thickness of the outer tank 16 is 1.5 to 2.5 times greater than the wall thickness of the inner tank 14 in all embodiments.

Preferably, the inner tank 14 and the rigid foam insulation are configured to have long time creep behavior, the long creep behavior being adjusted to each other to ensure a minimum residual duration. In addition, the outer tank 16 is preferred when it has sufficient strength to absorb the stress caused by the internal pressure after reaching the minimum remaining duration.

5 shows a simple cross-sectional view of a heat accumulator 70 according to a second embodiment of the invention for use on the ground. Unlike the regenerator 50 shown in FIG. 4, the cylindrical intermediate region of the regenerator 70 is longer, so that the regenerator 70 according to FIG. 5 has a larger capacity than the regenerator 50 according to FIG. 4. Has In use, the heat accumulator 70 is erected with the bottom 16a down.

Each of the inner tank 14 and the outer tank 16 of the heat accumulators 50 and 70 according to FIGS. 4 and 5 is manufactured by a blow molding method, as described above. The heat accumulators 50, 70 according to FIG. 4 or 5 can simply be manufactured in the manner described in the description of FIG. 3 with respect to the specific heat accumulator 10 for use on the ground.

6 shows a simple cross-sectional view of a heat accumulator 80 according to a third embodiment of the invention for use on the ground. The outer diameter of the inner tank 14 is approximately 79 cm. The outer tank 16 is divided into two parts 52, 54. The two parts 52, 54 of the outer tank 16 are each designed so that the maximum dimension in one direction does not exceed 79 cm. Due to this, the two parts 52, 54 of the inner tank 14 and the outer tank 16 can simply be transported individually through a standard door having a width of about 80 cm, whereby a house, in particular The heat accumulator 80 may simply be installed in the basement.

The first part 52 of the outer tank 16 and the second part 54 of the outer tank 16 are joined to each other by threaded connections. To this end, one of the two parts 52, 54 includes an internal thread 82, and the other parts 52, 54 have an external thread 84 that is complementary to the internal thread 82. . When installing the heat accumulator 80 in a specific position, the two parts 52, 54 of the outer tank 16 can be joined together, in particular simply, by means of threaded connections. In addition, the two parts 52, 54 can be separated from one another simply without damage in disassembly. The heat loss is reduced by the fastening screw joints.

As an alternative, the two parts 52, 54 can be joined to each other by a fixing ring.

FIG. 7 shows a simple cross-sectional view of a heat accumulator 90 according to a fourth embodiment of the invention for use on the ground. The heat accumulator 90 includes an inner tank 14 having a diameter of about 79 cm. The outer tank 16 is divided into three parts 92, 94, 96. The three portions 92, 94, 96 are each designed not to exceed a length of 79 cm. The first portion 92 is coupled to the second portion 94 by the first screw engaging portion 98, and the second portion 94 is the third portion 96 by the second screw engaging portion 100. Is coupled to. Threaded portions 98 and 100 are formed by internal threads and by external threads complementary to the internal threads, respectively.

Outer- and inner threads are integrally formed together in portions 92, 94, 96 in a blow molding method. By forming the regenerator 90 in multiple parts, larger capacity is achieved.

In an alternative embodiment of the invention, the heat accumulator 90 consists of three or more parts, for example four parts, so that a larger capacity of the heat accumulator is achieved and / or the size of the parts is reduced. Can be carried through a smaller door or other opening.

The storage tank 12 of the heat accumulators 80, 90 according to FIGS. 6 and 7 can be produced simply by a blow molding method. For this purpose in the first blow molding process, as described in connection with FIG. 3, the inner tank 14 is made of thermoplastic plastic. In other blow molding processes the individual parts 52, 54, 92, 94, 96 of the outer tank 16 are manufactured, in which case each inner- or outer thread 82, 84 is directly integrally formed. In the next step, the rigid foam insulation is disposed in the individual parts 52, 54, 92, 94, 96. To this end, the parts 52, 54, 92, 94, 96 of the outer tank 16 are filled with a rigid foam material by a foam mold with an inner core, the diameter of the inner core 14 being of the inner tank 14. It corresponds to the outer diameter. In this process the portions 52, 54, 92, 94, 96 form an outer shape and the inner core of the foam mold forms a corresponding inner shape. The gaps between the parts 52, 54, 92, 94, 96 and the inner core are each filled with an insulating hard foam, so that an insulating portion is formed. The rigid foam insulation is attached to the portions 52, 54, 92, 94, 96 even after removing the inner core. The portions 52, 54, 92, 94, 96 are folded over the inner tank 14 and fixedly joined to each other by threaded joints formed by the inner and outer threads 82, 84, thereby making the inner tank 14 Portions 52, 54, 92, 94, 96 of the outer tank are conveyed and mounted to the installation positions of the regenerators 80, 90, respectively.

The heat accumulators 50, 70, 80, 90 described in FIGS. 4 to 7 are erected vertically for operation, ie their longitudinal axes are vertical. The outer parts 52, 54, 92, 94, 96 and the corresponding rigid foam insulation have horizontal separation lines, which offers important technical advantages. Vertical separation of the insulation and outer parts creates a relatively long separation line. When pressure is applied to the outer shell through the rigid foam insulation due to the internal pressure of the inner tank 14, the gap expands along the separation line between the portions, and the loss of heat released through the gap increases. In the present invention, heat loss is reduced, in particular because a relatively short separation path and improved sealing force are achieved when screwing the parts together.

In embodiments so far the inner tank 14 consists of solid PE or PP in a single layer. To further improve heat storage properties, the inner tank 14 may have a three-layer wall structure. The examples according to FIGS. 8, 9 and 10 are embodiments for an inner tank 14 having an inner layer 102, an intermediate layer 104 and an outer layer 106. Preferably the inner layer 102 comprises a solid PP or a solid PE and the outer layer 106 comprises a solid PP or a solid PE. Interlayer 104 includes foamed PP or foamed PE (FIG. 8).

The embodiment according to FIG. 9 shows an improvement, in which the intermediate layer 104 comprises a reinforcement 108 made of solid or foamed PP or PE and further made of glass fiber 108. This may further improve the pressure stability of the inner tank 14. Optionally, the outer glass fiber sheath 110 of the outer layer 106 may also be provided with a polyester resin or an epoxy resin to further increase the pressure resistance. In the embodiment according to FIG. 9, the inner layer 102 and the outer layer 106 may be made of solid PE or PP and the intermediate layer 104 may be made of foamed PE or PP. The outer layer 106 includes a glass fiber sheath 110. In this structure, the thermal insulation is improved by the foamed intermediate layer 104 and the pressure resistance is improved by the glass fiber sheath 110.

Important in heating technology is oxygen diffusion. To ensure high corrosion resistance of the heating pipes, oxygen diffusion should not exceed the limit. For this purpose, DIE 4726 must be satisfied. In the examples according to the invention the ratio of tank surface to tank capacity is relatively large and the wall thickness of the inner tank 14 is also large, so very little oxygen diffusion can occur. Another improvement can be achieved by an oxygen-blocking layer in the inner tank 14. In the example according to FIG. 10, a barrier layer known as EVOH (ethylene-vinyl-alcohol) or SELAR (product name) is used as the intermediate layer 112. The layer 112 may be combined with the intermediate layer 104 according to the embodiments of FIGS. 8 and 9. Alternatively or additionally, external fluorination and / or internal fluorination of the inner tank 14 can be effected.

10, 10a, 10b, 10c, 50, 70, 80, 90 heat storage
12, 12a, 12b, 12c storage tank
14, 14a, 14b, 14c inner tank
16, 16a, 16b, 16c outer tank
18 storage medium, hot water
20 clearance
22 pressure cover
24 exhaust pipe
26 assembly housing
28 neck area
30 insulation
32 Assembly area for connections
34 Pipe penetration
36 neck
38 closure cover
40 inlet pipe
42 retaining ring
44 welding seam
46 flange
52, 54, 92, 94, 96 parts of outer tank
56 welded connections
58 pressure cover
60, 62 holes
64 insulated hood
82, 84 threads
98, 100 screw connection
102 Inner Layer
104 Middle Floor
106 Outer Layer
108 Fiberglass Reinforcements
110 fiberglass sheath
112 blocking layer

Claims (22)

Regenerator 10, 50, 70, 80, 90 comprising a mass storage tank 12 for storing a storage medium 18, wherein the storage tank 12 comprises an inner tank 14 and an outer tank 16. In a heat storage device comprising:
The inner tank 14 is formed of a temperature resistant thermoplastic plastic, the outer tank 16 is formed of a pressure resistant thermoplastic plastic,
A thermal insulation material is disposed in the gap 20 between the inner tank 14 and the outer tank 16,
The wall thickness of the outer tank (16) is 1.5 to 2.5 times greater than the wall thickness of the inner tank (14). 2. The heat accumulator according to claim 1, wherein the inner tank has a wall thickness of 4 to 10 mm, preferably 6 to 8 mm. 3. The regenerator according to claim 1 or 2, characterized in that the outer tank (16) has a wall thickness of 8 to 20 mm, preferably 10 to 15 mm. The heat storage device according to claim 1, wherein the distance between the outer surface of the inner tank and the inner surface of the outer tank is 50 to 100 mm, preferably 70 to 90 mm. . The heat storage according to any one of claims 1 to 4, wherein the outer diameter of the outer tank is 500 to 1000 mm, preferably 750 to 800 mm. 6. The inner tank 14 according to any one of the preceding claims, wherein the inner tank 14 has a capacity of 200 to 600 l, preferably for use outside of the building, and has a capacity of 2000 to 4000 l. Regenerator having a capacity of 200 to 800 l for internal use. 7. The inner tank 14 according to any one of the preceding claims, wherein the inner tank 14 has a three-layer structure, wherein the inner layer comprises solid PP or solid PE and the outer layer comprises solid PP or PE. Heat storage 8. The regenerator of claim 7, wherein the intermediate layer comprises PP- or PE-foam. 8. The regenerator of claim 7, wherein the intermediate layer comprises PE or PP and each comprises a glass fiber reinforcement. 10. The regenerator as claimed in claim 7, wherein the outer layer of the inner tank (14) further comprises a glass fiber-reinforced portion. 11. A method according to any one of claims 7 to 10, characterized in that it comprises an oxygen-blocking layer and / or external fluorination and / or internal fluorination to reduce the oxygen diffusion of the inner tank 14. Heat accumulator. The heat accumulator according to claim 1, wherein the outer tank comprises at least one first part and a second part, separate from the second part. 13. Regenerator according to claim 12, characterized in that the length of each of the portions (52, 54) in the longitudinal axis is smaller than the diameter of the portions (52, 54). 14. Heat storage according to claim 12 or 13, characterized in that the lengths of the parts (52, 54, 92, 94, 96) of the outer tank (16) are each up to 790 mm. 15. The method according to any one of claims 12 to 14, wherein the first portion (52) or the second portion (54) of the outer tank (16) comprises an external thread and the other portion is relative to the external thread. A complementary internal thread, wherein the first portion (52) and the second portion (56) can be coupled to each other by threaded connections formed by external threads and internal threads. 15. The regenerator according to any one of claims 12 to 14, characterized in that the first part (52) can be joined by the second ring (54). As a method of manufacturing a large capacity storage tank 12 for storing thermal energy, the inner tank 14 is made of thermoplastic plastic in a blow molding process,
The outer tank 16 having a larger diameter than the inner tank 14 is made of thermoplastic plastic in another blow molding process,
The outer tank 16 is divided into at least two parts of ring shapes 52 and 54, the parts of the outer tank 16 being outside of the inner tank 14 such that a gap 20 is disposed therebetween. In the manufacturing method of the storage tank arranged at predetermined intervals with respect to the surface,
The parts of the outer tank 16 are joined to each other,
The gap (20) between the inner tank (14) and the outer tank (16) is filled with a plastic-foaming material. 18. The method according to claim 17, wherein the ring-shaped portions (52, 54) of the outer tank (16) are joined to each other by at least one threaded portion. 19. A plurality of storage tanks (10a, 10b, 10c) with different capacities are produced and the inner tank (14b) for a storage tank (10b) with medium capacities. A blow mold of the outer tank (16a) of the storage tank (10a) having a reduced capacity as a blow mold for use is used. 20. The blow mold according to claim 19, wherein a blow mold for the inner tank 14c of the storage tank 10c having a reduced capacity is used as a blow mold for the outer tank 12b for the storage tank 10b having an intermediate capacity. Manufacturing method As a method of manufacturing a large capacity storage tank 12 for storing thermal energy, the inner tank 14 is made of thermoplastic plastic in a blow molding process,
At least two parts 52, 54, 92, 94, 96 of the outer tank 16 having a diameter larger than the diameter of the inner tank 14 are made of thermoplastic plastic by another blow molding process,
On the inner side of the parts 52, 54, 56, 92, 94, 96 of the outer tank 16, facing the inner tank in the assembled state, a layer of plastic foam material is arranged, respectively Is designed so that the intermediate region 20 between the inner tank 14 and the outer tank 16 is at least partially filled by the layer,
The portions 52, 54, 56, 92, 94, 96 of the outer tank 16 are disposed around the inner tank 14,
Subsequently the parts (52, 54, 92, 94, 96) of the outer tank (16) are joined to each other. 22. The method of claim 21, wherein the portions 52, 54, 92, 94, 96 of the outer tank 16 are each formed by at least one threaded engagement formed of at least one outer thread and at least one inner thread. Coupling each other, the inner thread and the outer thread are each of the parts 52, 54 in a blow molding process for the production of the parts 52, 54, 92, 94, 96 of the outer tank 16. , 92, 94, 96) is formed integrally together.

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