Technical area

[001] This invention relates to an apparatus for drying a water damaged floor structure, com prising a suction blower for drawing process air from the floor structure, a sorption dehumififier for receiving the process air from the suction blower mixed with process air from the environ ment through an inlet and converting the thus mixed process air to dry air, a common housing for the suction blower and the sorption dehumidifier, and a PTC element arranged in a regener ation chamber in the sorption dehumidifier for a rotating type sorption block in the sorption de humidifier.

Background

[002] A general drying apparatus of this kind is known from SE 1450924. However, this drying device is not stated to be particularly intended for drawing wet process air from a floor struc ture.

Disclosure of the invention

[003] An object of the invention is to provide an apparatus of the above identified kind that is particularly adapted to effectively dry a floor structure by providing a high vacuum and energy efficiently converting the humid process air into hot dry air which in various applications can be returned to the floor structure, either directly through dry air flow or indirectly through heat transfer, depending on application.

[004] Another object is to provide an optimized integrated drying machine which is easy to handle, transport and install, has a low noise and is energy efficient.

[005] According to the invention, the suction blower is a side channel blower capable of heat ing the process air, an additional fan being arranged between the suction blower and the sorp tion dehumidifier to increase the flow of the mixed process air from the suction blower and the surrounding environment, and the housing has a sound and heat insulation. The side channel blower has an inherently high ability to generate high suction power and to heat the humid process air. The additional blower is capable of increasing the flow of the pressurized heated humid process air entering the dehumidifier. The presence of the PTC element in the dehumidi fier enables continuous dehumidification at high temperatures without activating a protective device against overheating, which is not the case with traditional pipe dehumidifiers. As a re sult, the drying device also becomes more or less self-regulating, so that it can work safer with out supervision. Thus, the PTC element is crucial for the proper operation of the device.

[006] The energy efficiency is achieved by the fact that a large part of the heat which is other wise emitted to the environment from the suction blower including its motor and suction and pressure lines can be suitably delivered to the dehumidifier inside the heat insulated housing where it is reused by the dehumidifier. The suction blower provides the greater part of the pro cess air flow through the intermediate layer and therefore needs high power which generates high heat. This is advantageous and of great importance for this type of drying operation, where the dry air emitted from the dehumidifier needs to be as hot as possible for best drying results.

[007] In one embodiment, the suction blower may be located at the underside of the dehu midifier in the housing. Then the dehumidifier can be heated by convection from rising air heated by the suction blower in the housing.

[008] The sound and heat insulation may be a laminate comprising a thicker insulating and damping layer and a thinner reflective layer. Thereby the dryer can easily be heat and sound in sulated.

[009] Other features and advantages of the invention may be indicated by the claims and the following detailed description.

Brief description of the drawing

[010] FIG. 1 is a simplified side view, partly in section and with parts broken away, showing a drying apparatus according to the invention during a drying operation of a floor structure; [Oil] FIG. 2 is a simplified perspective view with broken away parts of a dryer according to the invention during a drying operation of a floor structure according to FIG. 1; [012] FIG. 3 is a simplified side view, partly in section and with parts broken away, show ing a drying apparatus of FIG. 1 during a drying operation of another floor structure; and

[013] FIG. 4 is a diagrammatic plan view showing a drying apparatus of FIG. 1 during an alter native drying operation where the floor structure has two outlet openings.

[014] In the drawings, wherever possible, same reference numerals are throughout used for components with the same or similar function.

Detailed description of embodiments

[015] In the embodiment shown in FIG. 1, the drying apparatus 100 according to the invention is intended to dry a water damaged floor structure 10 of the type having a damp proofing layer 30 in an intermediate layer 32 having an air gap between a flooring 20 and a subfloor 40.

[016] Typically, in such a floor structure 10, the flooring 20 may consist of a surface layer 22, a chipboard layer 24 and a heat-insulating layer 26 of cellular plastic, while the subfloor 40 may consist of a base/baseplate 42 of concrete and a soundproofing cellular plastic layer 44. The damp proofing layer 30 may be a membrane known under the trademark Platon ^® which is formed with a pattern of projections projecting at least from a bottom side 34 of the mem brane to define the air gap 32 between the subfloor 40 and the flooring 20.

[017] In the flooring 20, e.g. with a cutter not shown, a space 80 is opened-up down to the damp proofing layer 30. The space 80 provides access to the damp proofing layer 30 to form a dry air inlet 38 therewith. The dry air inlet 38 can be made with any suitable means, e.g. manu ally with a knife (not shown), which cuts an opening in the layer, after which the material thus cut away is removed.

[018] At the top of the flooring 20, the space 80 is sealed closed by a plate 70 during the dry ing operation described below. The plate 70 may have a pair of through-tubes 72 and 74 for sealingly receiving a respective dry air conduit 56 and a process air conduit 66, in turn, extend ing to a respective dry air outlet 52 and a process air inlet 64 of the drying apparatus 100. The dry air conduit 56 extends through the space 80 and into the dry air inlet 38 where it is sealed by a suitable sealing agent, such as bitumen. The process air conduit 66, in turn, extends only into the space 80 which can be regarded as an outlet orifice chamber for humid process air. The plate 70 may be attached and sealed to the flooring 20 by suitable means not shown, e.g. glue or screws and sealing strips.

[019] The drying operation is carried out such that the drying device 100 creates a strong un derpressure and draws process air 68 from the process air line 66 while pressing heated dry air 58 into the dry air line 56. The heated dry air 58 is spread in all directions while accumulating moisture from the subfloor 40. When the process air 68 reaches the end edges of the layer 30, it is forced by the strong underpressure to change direction and flow radially toward the space 80 and accumulate more moisture in the portion of the gap 32 at the the top of layer 30. The process air 68 then enters the space 80, from which it is sucked into the process air line 66 and further to the drying apparatus 100.

[020] The drying apparatus 100 has a housing 102 with an internal sound and heat insulation. The sound and heat insulation comprises a laminate having a thicker sound attenuating and heat insulating layer 104 and a thinner sound and heat reflecting layer or film 106. The laminate may be adhered to the interior of the housing 102.

[021] Within the sound and heat insulation 104, 106, in the housing 102, a dehumidifier 50 is mounted parallel to a suction blower 60. More specifically, the dehumidifier 50, in a manner not shown per se, is suitably installed on one side of the housing 102, and the suction blower 60 is mounted in close heat conductive contact directly to a bottom side of the dehumidifier 50.

[022] As can be seen most clearly in FIG. 1, the suction blower 60 is a side channel blower in cluding an electric motor 122 and a centrifugal blower housing 124, which has a suction duct 126 arranged to be connected to the above-mentioned process air line 66, and an outlet duct 128 connected to an inlet 152 of the dehumidifier 50.

[023] Dehumidifier 50 is a sorption dehumidifier having an inlet 170 for process air 172 from the environment. At the inlet 170 there is a fan or blower, such as a duct fan 154, to increase the flow rate of the process air flow 172 from the environment mixed with the process air flow 68 heated by the suction blower further into the dehumidifier 50. After the fan 154, the process air is conducted into a sorption block 156 which can be of a rotating type. The sorption block 156 has an absorbent for accumulating moisture in the process air and is capable of dividing the outgoing flow into the above-mentioned dry-air flow 58 and a wet-air flow 78 which is discharged from the drying apparatus 100 through an outlet duct 162, from which it can be dis charged through a wet-air conduit 76. Dehumidifier 50 also has a regeneration chamber 158 in which there is a self-regulating so-called PTC (Positive Temperature Coefficient) element 160 to further heat the resulting dry air when needed. Without such a PTC element, dehumidification would deteriorate by activating an over-heat protective device and thereby degrading opera tion.

[024] In FIG. 2, there is also shown a slightly modified dryer device 100 mounted on a hand trolley 108 to be easily moved over shorter distances.

[025] In the embodiment shown in FIG. 3, the drying apparatus 100 according to the invention is intended to dry a moisture-damaged floor structure 10 of the kind which, below a flooring 20 with a surface layer 22, has an intermediate layer 32 in the form of a porous heat-insulating layer between an upper concrete layer 42' and a lower concrete layer / subfloor 40 such as a frame / base plate in a building wall. In this example, therefore, there is no moisture-protecting layer or air gap as in the example already described. The air transported here and collecting moisture in the intermediate layer 32 can now flow more uniformly in the porous layer be tween the inlet opening 38 and the outlet opening 80, which in this case are arranged at greater distances from each other in the floor structure.

[026] FIG. 4 shows the possibility of sucking process air 68 from two outlet openings 80 in the floor structure 10 with the drying apparatus 100. In a manner not shown more than two outlet openings 80 are likewise possible. Even more than one inlet port 38 can be used.

[027] As initially indicated, the drying apparatus according to the invention can also be used in applications where the dry air is not returned to the floor structure. The heated dry air can then for example be used to transfer heat to the floor structure (not shown).

[028] The above detailed description is primarily intended to facilitate understanding and no unnecessary limitations of the invention are to be construed therefrom. The modifications which will become apparent to those skilled in the art upon review of the specification may be made without departing from the scope of the appended claims.