EP4506633A1 - Ventilation device for domestic use and method for assembling or maintenance of a ventilating device - Google Patents

Abstract

The invention relates to a ventilation device (100) for domestic use, comprising a housing (102), at least one supply air and/or exhaust air line (104, 106) arranged in the housing (102) for guiding a supply air or exhaust air flow (108, 110) through the housing (102), at least one radial fan (116) arranged in the supply air and/or exhaust air line (104, 106) with backward-curved blades (120) for generating the supply air or exhaust air flow (108, 110), and at least one differential pressure sensor (128) arranged within the housing (102), which is designed to detect pressure conditions at at least two measuring points (132, 132') in the housing (102), on the basis of which a supply air or exhaust air flowing through the supply air and/or exhaust air line (104, 106) exhaust air volume flow is controlled.

The housing (102) is formed from at least a first housing part (112) and a second housing part (114) corresponding to the first housing part (112) and forming a connecting region (124), wherein the differential pressure sensor (128) is arranged in the connecting region (124) of the first and second housing parts (112, 114) in a receiving space (126) defined by at least one of the housing parts (112, 114) and unaffected by the supply air or exhaust air flow (108, 110).

Description

The invention relates to a ventilation device for domestic technology, comprising a housing, at least one supply air and/or exhaust air line arranged in the housing for guiding a supply air or exhaust air flow through the housing, at least one radial fan arranged in the supply air and/or exhaust air line with backward-curved blades for generating the supply air or exhaust air flow, and at least one differential pressure sensor arranged within the housing, which is set up to detect pressure conditions at at least two measuring points in the housing, on the basis of which a supply air or exhaust air volume flow flowing through the supply air and/or exhaust air line is controlled. The invention also relates to a method for assembling or maintaining a ventilation device.

Ventilation devices for building services are known in the prior art, in particular living space ventilation devices, which are used to ventilate or de-ventilate rooms in buildings. Such ventilation devices are used in particular to ensure a controlled exchange of air in the rooms, with room air being replaced by fresh outside air either continuously or alternately at predetermined intervals. The ventilation devices have an air-conducting connection between the room or rooms in the building and an outside area of the building. Ventilation devices are known which have a combined supply air and exhaust air line for guiding the supply air or exhaust air flow through the housing. Other ventilation devices have a supply air and exhaust air line each formed separately in the housing for guiding the supply air and exhaust air flow through the housing.

Particularly efficient ventilation devices, especially residential ventilation devices, use radial fans with backward-curved blades to generate the supply air or exhaust air flow in the ventilation device. Due to the low air deflection, which results in lower shock losses, these have a lower power consumption when the ventilation device is in operation. Furthermore, such efficient ventilation devices have a constant volume flow control so that despite changing operating conditions during operation, for example increasing filter contamination or system-related influences, for example additional accessories such as silencers or pipe lengths adapted to the installation situation, the required volume flow can be provided.

However, constant volume flow control cannot be implemented on radial fans with backward-curved blades using the radial fan characteristic field that is otherwise used. On such radial fans, differential pressure measurement is typically used for volume flow control. During differential pressure measurement, pressures in the housing are recorded at at least two measuring points using a differential pressure sensor. The differential pressure determined from this, which is preferably proportional to the volume flow conveyed in the supply air or exhaust air line, serves as a control variable for the supply air or exhaust air volume flow flowing through the supply air and/or exhaust air line. In order to accurately record the differential pressure, it is necessary to position the differential pressure sensor used for this purpose in a defined manner so that any influences such as tolerances during assembly, which could have a negative effect on the measurement result, are avoided. Furthermore, it is also crucial that such a differential pressure sensor is protected from any particles carried along with the supply air or exhaust air flow, such as dust or moisture, in order to keep deviations in the pressure measurement as low as possible.

The invention was therefore based on the object of avoiding any disadvantages that may occur when measuring the differential pressure in a ventilation device and, in particular, of demonstrating a ventilation device for domestic engineering, in particular a living space ventilation device, and a method for assembling or maintaining a ventilation device, on or by means of which the assembly of the differential pressure sensor is simplified, despite a continued reliable and, above all, precise differential pressure measurement, wherein, in particular, the differential pressure sensor can be easily removed or replaced if necessary.

The invention solves the underlying problem according to a first aspect by a ventilation device for domestic technology of the aforementioned type with the features according to claim 1. In particular, the ventilation device is characterized in that the housing is formed from at least a first housing part and a second housing part corresponding to the first housing part and forming a connecting region, wherein the differential pressure sensor is arranged in the connecting region of the first and second housing parts in a receiving space defined by at least one of the housing parts and unaffected by the supply air or exhaust air flow.

The invention here follows the approach of arranging the differential pressure sensor directly in the connection area of two housing parts forming the housing, instead of at any point within the housing, in a receiving space that is not directly influenced by the supply air or exhaust air flow. This means that the differential pressure sensor is above all protected and, at best, unaffected by the supply air or exhaust air flow and any particles carried along with it in the housing. The receiving space for the differential pressure sensor is preferably designed as a recess directly adjacent to the connection area in which the two housing parts are in direct or only indirect contact with one another. The receiving space for the differential pressure sensor is preferably unaffected by or is not directly acted upon by the volume flow that flows through the supply air and/or exhaust air line, but has a pressure-conducting connection to the supply air and/or exhaust air line. This essentially ensures continuous, stable pressure conditions within the receiving space for the differential pressure sensor. The differential pressure sensor can, for example, be mounted on a bracket formed in the receiving space.

Preferably, the control or adjustment of the volume flow generated by the radial fan within the supply air and/or exhaust air line is carried out on the basis of the pressure conditions recorded by the differential pressure sensor at the two measuring points in the housing by means of a control device on the ventilation unit that is connected to the differential pressure sensor and the radial fan in a signal-conducting manner.

The accommodation space for the differential pressure sensor preferably has a connection to a section of the supply air or exhaust air line carrying the supply air or exhaust air flow. A first measuring point is thus formed in the accommodation space for detecting the pressure using the differential pressure sensor, in which a lower pressure is measured compared to the environment, but which is tapped in a flow-calmed area of the housing, which is not influenced by flow effects or turbulence. This achieves a sufficiently large pressure difference to a second measuring point of the differential pressure sensor, at which the pressure in the supply air or exhaust air flow with maximum flow is preferably tapped. The differential pressure sensor accommodated within the accommodation space is therefore only connected to a measuring line at one of its measuring connections, which is led to the other (second) measuring point to transmit the pressure for the required differential pressure. The sufficiently large pressure difference enables precise control of the volume flow at the radial fan.

A further development of the invention provides that the receiving space for the differential pressure sensor is arranged above a receiving space for the radial fan, which are preferably formed in different housing parts. By arranging the differential pressure sensor above the receiving space for the radial fan, the latter is positioned at a higher point in the housing, so that a measuring line leading towards the differential pressure sensor is laid upwards. Any condensate that forms within the housing does not reach the differential pressure sensor via the lines, but is guided away from the sensor. The receiving space for the differential pressure sensor preferably forms a cavity on the upper (second) housing part that is closed at the top and can only be reached from the underside of the second housing part. The receiving space for the radial fan is preferably formed in the lower (first) housing part.

In a further embodiment, the connecting area between the first and second housing parts is formed exactly above the radial fan arranged in the housing. By designing the connecting area directly above the receiving space for the radial fan, a structurally simple separation of the housing of the ventilation device is achieved. In particular, the completion of the individual housing parts with the components to be equipped with them is simplified. Access to the receiving space for the differential pressure sensor is from the underside of the upper (second) housing part. The differential pressure sensor is therefore arranged directly above the radial fan. The holding part, which is arranged in the connecting area of the housing parts, can, in one embodiment, for example, have direct contact with air-conducting sections of the receiving space accommodating the radial fan or of the radial fan itself.

According to a preferred embodiment of the ventilation device, the differential pressure sensor is arranged on a holding part that is separate from the housing parts and is accommodated in the connection area between the first and second housing parts. Instead of arranging the differential pressure sensor directly on a housing part, it is placed on a separate component. In the event of maintenance, the differential pressure sensor can be easily removed from the holding part in the connection area between the housing parts of the ventilation device. The differential pressure sensor is accommodated on the holding part in such a way that it protrudes into the special receiving space defined by at least one of the housing parts and is thus still housed safely and, above all, protected in the fan housing. The holding part is arranged between the first and second housing parts, with areas of the holding part preferably being in contact with or connected to both the first and second housing parts.

The holding part for the differential pressure sensor is preferably provided as a separating part for at least areas of the housing parts of the housing that are to be joined together. The holding part thus directly separates areas of the otherwise connected housing parts from one another, with the housing parts acting on the holding part from preferably opposite sides. In a preferred embodiment, the holding part together with the differential pressure sensor arranged on it is held in position by means of the housing parts acting on it. The housing parts in the connection area preferably have corresponding surface sections that correspond to the holding part and define the position of the holding part in the connection area relative to the housing parts. This simplifies the assembly/maintenance of the ventilation device because the holding part with the differential pressure sensor arranged on it is mounted in the correct place in a position-accurate manner thanks to the predefined alignment.

A further development of the ventilation device provides that the holding part has a substantially flat surface element extending along the connection area, which has one or more recesses that cooperate with the supply air or exhaust air line in the housing. The holding part, which in one embodiment only extends over a relatively small section in the connection area, can in an alternative embodiment extend between the first and second housing parts up to the external dimensions of the housing formed by the housing parts. In particular, the surface element of the holding part has specially designed material projections or shaped recesses on its sides facing away from one another, which only allow a predetermined installation position of the holding part together with the differential pressure sensor on, for example, the lower (first) housing part. The upper (second) housing part is placed on the lower housing part and the holding part resting on it. The surface element has, for example, recesses that correspond to the supply air or exhaust air line running through the housing.

According to a preferred development, the recess(es) have a material web that protrudes approximately vertically from the surface element and is preferably aligned with the wall of the supply air or exhaust air line. The transition between the housing parts and the holding part arranged between them in the area of the supply air and/or exhaust air line is thus designed to be step-free, which promotes trouble-free guidance of the supply air or exhaust air flow in the supply air and/or exhaust air line. The material web preferably protrudes on both sides of the surface element in the area of a recess. The material web also engages in recesses that are in the area of the supply air and/or Exhaust air lines are formed on the housing parts. Preferably, the housing parts and the holding part for the pressure sensor are connected to one another in a materially bonded manner, so that a seal is created in the connection area of the components that are in direct contact with one another (first and second housing parts and holding part).

Preferably, the holding part comprises a receiving section for the differential pressure sensor, on which the differential pressure sensor is reversibly detachably received. This simplifies the assembly and disassembly of the differential pressure sensor on the holding part itself and on a housing of the ventilation device that accommodates the holding part together with the differential pressure sensor.

According to a preferred embodiment of the ventilation device, the receiving section has an elastically deformable locking part that can be brought into a holding operative connection with the differential pressure sensor for a reversibly releasable positive connection of the differential pressure sensor to the receiving section. By providing an elastically deformable locking part, for example a spring or snap hook on the receiving section, a structurally simple possibility for implementing a reversibly releasable locking of the differential pressure sensor on the holding part, in particular on its receiving section, is achieved. The differential pressure sensor can be released from the receiving section on the holding part by moving the locking part from its locking position, in particular without tools. The receiving section preferably has an insertion area and a locking area for the sensor. The locking area for the differential pressure sensor, in particular for the circuit board that accommodates the differential pressure sensor, preferably runs parallel to the surface element of the holding part. The locking area and the insertion area for inserting the differential pressure sensor into the receiving section are aligned with each other at an angle in the range of approximately 100 to approximately 170 degrees.

According to a preferred development, the differential pressure sensor has at least two measuring connections, whereby only one of the measuring connections is connected in an air-conducting manner to a measuring line that extends in particular into the intake area of the radial fan. Due to the protected accommodation of the differential pressure sensor in a flow-calmed area above the radial fan, a measuring connection measures the pressure directly in the accommodation space. The other measuring connection is coupled to a measuring line that extends into the intake area of the radial fan and records the static pressure there, which is reduced compared to the pressure in the accommodation space. The volume flow generated by the radial fan is determined from the differential pressure determined on the basis of other factors and operating conditions that must be taken into account, such as the fan speed. and adjusted or controlled if necessary. By arranging the differential pressure sensor directly above the radial fan, the measuring line used to record the pressure in the intake area of the radial fan can have an advantageously short line length, which minimizes inaccuracies when measuring the pressure conditions in the housing.

In one embodiment of the invention, it is provided that the measuring line, which is led from the one measuring connection on the differential pressure sensor to the intake area of the radial fan, is led through a recess in the holding part for the differential pressure sensor. This counteracts constriction or kinking, which would lead to pressure losses in the measuring line and thus to falsification of the measurement results, if the measuring line is designed in particular as a flexible hose.

According to one embodiment, at least one of the housing parts is made of at least partially foamed plastic, in particular expanded polystyrene (EPS) or expanded polypropylene. Preferably, the entire housing with its first and second housing parts consists of a foamed plastic. The multi-part nature of the housing simplifies its manufacture, in particular the formation of the supply air and/or exhaust air strands or the receiving spaces for the differential pressure sensor and the radial fan in the housing parts. In addition, the corresponding surfaces forming the connection area of the housing parts can be used to produce the required recesses or elevations for the holding part that interacts with the housing parts in a simplified manner.

According to a second aspect, the object underlying the invention is achieved by a method for assembling a ventilation device, in particular a ventilation device according to claim 1. In particular, the method is characterized by the steps: providing a housing consisting of at least two housing parts and at least one differential pressure sensor; electrically connecting the differential pressure sensor to a control of the ventilation device using at least one connecting line; joining the two housing parts to one another, wherein a receiving space for the differential pressure sensor is formed which is unaffected by the supply air and/or exhaust air flow and is defined by at least one of the housing parts, and positioning the differential pressure sensor in the receiving space relative to one of the housing parts in the connection area of the housing parts to one another, preferably using a holding part to be arranged in the connection area, on which the differential pressure sensor is received in a particularly reversibly detachable manner.

In its own form, the invention according to the second aspect proposes a method for assembling a ventilation device, which is significantly simplified compared to the known methods by arranging the differential pressure sensor in the connection area between the housing consisting of two housing parts. The differential pressure sensor can be arranged in the connection area between the first and second housing parts, in particular without tools, using a holding part that holds the differential pressure sensor. The electrical connection of the differential pressure sensor takes place before the differential pressure sensor is positioned on the housing part and preferably before the housing parts are joined. The holding part is simply placed on the surfaces on the lower housing part that form the connection area by bringing it into contact with the receptacles formed on at least one, in particular the lower (first) housing part, and positioned thereon. The two housing parts are joined preferably by the material-locking connection, in particular gluing, of the housing parts to one another. The differential pressure sensor is then inserted into the joined housing. At best, or at least almost, the assembly can be carried out without tools and, in addition, positioning the differential pressure sensor using the holding part on the housing prevents incorrect assembly of the differential pressure sensor. Preferably, according to one embodiment of the method, only one measuring connection on the differential pressure sensor is provided with a measuring line that is routed into the intake area on the radial fan.

According to a further aspect, the invention relates to a method for maintaining a ventilation device, in particular a ventilation device according to claim 1. In particular, the method is characterized by the steps: making the interior of a housing consisting of at least two housing parts joined together accessible; removing a differential pressure sensor from the connection area of the two housing parts, preferably removing the differential pressure sensor from a holding part arranged in the housing, on which the differential pressure sensor is accommodated in a particularly reversibly detachable manner, and at least replacing the defective differential pressure sensor with a new differential pressure sensor. The holding part is preferably arranged in the connection area of the two housing parts. The removal of the differential pressure sensor on the holding part is preferably carried out by mechanically decoupling the differential pressure sensor from the holding part, in particular by removing a reversibly detachable form-fitting connection between the differential pressure sensor and an elastically deformable locking part on the holding part, and electrically decoupling the differential pressure sensor from a control of the ventilation device by disconnecting a connection cable from the differential pressure sensor by means of the reversibly detachable receptacle of the differential pressure sensor in the housing, Maintaining a ventilation device is made significantly easier, particularly on the holding part, which is arranged in the connection area of the housing consisting of at least two housing parts. The differential pressure sensor can be removed from the holding part without tools thanks to the form-fitting connection, which can preferably be removed by hand, and can be replaced with a new, intact differential pressure sensor in the event of a defect.

In yet another aspect, the invention relates to the use of a differential pressure sensor arranged on a holding part, which is arranged in a connecting region of a housing consisting of at least two housing parts, for detecting pressure conditions in a ventilation device in domestic engineering, in particular in a living space ventilation device. With the inventive use, in particular of a differential pressure sensor arranged reversibly on a holding part, a ventilation device in domestic engineering can be equipped with a differential pressure sensor in a simple manner. With the aid of this, the pressure conditions at at least two measuring points within the ventilation device can then be detected in a simple and safe manner and on the basis of these, a resulting volume flow in a supply air and/or exhaust air line in the housing can be determined and, if necessary, adjusted.

The methods according to the invention as well as the use according to the invention make use of the same advantages as the ventilation device according to the invention of the first aspect. The preferred embodiments or further developments described for the first aspect are also at the same time preferred embodiments of the methods according to the invention and the use and vice versa, provided that they do not fundamentally contradict each other, which is why reference is made to the above statements in this regard to avoid repetition.

Fig. 1

eine schematische räumliche Ansicht eines erfindungsgemäßen Lüftungsgeräts im Schnitt;

Fig. 2

eine schematische Ansicht des im Lüftungsgerät nach Fig. 1 eingesetzten Differenzdrucksensors;

Fig. 3

eine perspektivische Ansicht eines im Verbindungsbereich der Gehäuseteile des Lüftungsgeräts nach Fig. 1 angeordneten Halteteils;

Fig. 4

eine vergrößerte, schematische Schnittansicht eines Aufnahmeabschnitts am Halteteil nach Fig. 3;

Fig. 5

eine weitere schematische, räumliche Teilansicht des erfindungsgemäßen Lüftungsgeräts nach Fig. 1, und

Fig. 6

noch eine weitere räumliche Schnittansicht des Lüftungsgeräts nach Fig. 1.

The invention is described in more detail below using a preferred embodiment of a ventilation device with reference to the attached figures.

Fig. 1

a schematic spatial view of a ventilation device according to the invention in section;

Fig. 2

a schematic view of the ventilation unit according to Fig. 1 differential pressure sensor used;

Fig. 3

a perspective view of a housing part of the ventilation unit according to Fig. 1 arranged holding part;

Fig. 4

an enlarged, schematic sectional view of a receiving section on the holding part according to Fig. 3 ;

Fig. 5

a further schematic, spatial partial view of the ventilation device according to the invention according to Fig. 1 , and

Fig. 6

another spatial sectional view of the ventilation unit according to Fig. 1 .

Fig. 1 shows a spatial representation of a ventilation device 100 according to the invention in section, which is used for ventilating and/or de-ventilating rooms in a building not shown in detail. The ventilation device 100 has a housing 102 in which at least one supply air line 104 and one exhaust air line 106 run. A supply air flow 108 is guided through the supply air line 104 into the building, in particular its rooms, and an exhaust air flow 110 is guided from the rooms to the outside of the building through the exhaust air line.

The housing 102 is made up of several parts and has a first housing part 112 and a second housing part 114. The first housing part 112 forms a lower housing part and the second housing part 114 forms the upper housing part of the ventilation device 100. In the supply air line 104 of the housing 102, in particular a section of the supply air line 104 in the first housing part 112, a radial fan 116 is arranged, which has a fan wheel 118 with backward-curved blades 120. Such a radial fan 116 with backward-curved blades 120 is used for the efficient generation of a volume flow in modern ventilation devices.

The only partially shown exhaust air line 106, in the form of a bypass channel that can be coupled to the exhaust air line 106 in a fluid-conducting manner, is also assigned a radial fan (not shown in detail) for generating a volume flow within the exhaust air line 106 of the ventilation device 100. The radial fan arranged in the exhaust air line 106 also has a fan wheel with backward-curved blades. The radial fan arranged in the exhaust air line 106 is designed identically to the radial fan 116 arranged in the supply air line 104 or is arranged in a similar form in the first housing part 112.

The radial fan 116 is arranged in a receiving space 122 in the first, lower housing part 112. The receiving space 122 and also the radial fan 116 are formed or arranged exactly below a connecting region 124 separating the first housing part 112 and the second housing part 114 from one another. The connecting region 124 separates the first and the second housing parts 112, 114 from one another along a plane E that runs essentially horizontally.

Furthermore, a differential pressure sensor 128 is arranged within the housing 102, in particular in a receiving space 126, which is positioned near or in the connecting area 124 of the first and second housing parts 112, 114. The differential pressure sensor 128 is designed to detect pressure conditions at at least two measuring points 132, 132', wherein a supply air or exhaust air volume flow flowing through the supply air line 104 and/or the exhaust air line 106 is set or controlled on the basis of the pressures detected at the measuring points 132, 132'. The supply air or exhaust air volume flow is set in particular by influencing the speed of the radial fan 116. The radial fan 116 has a drive device (not shown in detail) in the form of an electric motor.

The receiving space 126 accommodating the differential pressure sensor 128 is arranged within the housing 102 in such a way that it is unaffected by the supply air or exhaust air flow 108, 110. However, the receiving space 126 for the differential pressure sensor 128 has a connection to a section of the supply air or exhaust air line 104, 106 carrying the supply air or exhaust air flow 108, 110.

The receiving space 126 for the differential pressure sensor 128 is arranged above the receiving space 122 for the radial fan 116, whereby both receiving spaces 122, 126 are formed in different housing parts 112, 116. As can be seen from Fig. 1 As can also be seen, the connection area 124 is located exactly above the radial fan 116 arranged in the housing 102.

Fig. 2 shows an embodiment of the differential pressure sensor 128 used in the receiving space 126, which is arranged on a circuit board 130, also referred to as a circuit board. The differential pressure sensor 128 has two measuring connections 134, 136. By arranging the differential pressure sensor 128 within the flow-calmed receiving space 126, a pressure measurement can be carried out directly on site in the receiving space 122 by means of the measuring connection 134. A first measuring point 132 is thus within the receiving space 126, whereby the measuring connection 134 precisely detects the static pressure present in the receiving space 126.

In the embodiment shown here, the differential pressure sensor 128 is arranged on a holding part 128 that is separate from the housing parts 112, 114 and is accommodated in the connection area 124 between the first and second housing parts 112, 114. The holding part 138 functions as a type of separating part between the housing parts 112, 114 of the ventilation device 100. The holding part 128 separates at least areas of mutually facing surfaces of the housing parts 112, 114 to be joined.

As from Fig. 3 As can be seen from the drawing, the holding part 138 has a substantially flat surface element 140 extending along the connecting area 124. The surface element 140 defines the connecting area 124 and has contact surfaces 142, 144 facing away from one another, which come into direct contact with the first and second housing parts 112, 114. Recesses 146, 148 are formed on the surface element 140, which correspond to the supply air and exhaust air ducts 104, 106 in the housing 102. Material webs 150, 152, which protrude approximately perpendicularly from the surface element, run along the entire circumference of the recesses 146, 148. In the embodiment shown here, as in connection with Fig. 1 As can be seen, these are aligned with the walls of the supply air and exhaust air ducts 104, 106.

As can be seen from the Figures 3 and 4 As can be seen, a receiving section 154 for the differential pressure sensor 128 is provided on the holding part 138, by means of which the differential pressure sensor 128, in particular its circuit board 130, is reversibly detachably received. In the embodiment shown here, the receiving section 154 has, for example, an insertion area 156, via which the circuit board 130 together with the differential pressure sensor 128 is inserted at an insertion angle α, based on the surface element 140, in a range of 10° to 80°, preferably 45°.

The receiving section 154 also has a locking region 158 for the circuit board 130 together with the differential pressure sensor 128, which is aligned approximately parallel to the surface element 140 of the holding part 138. The insertion region 156 on the receiving section 154 and the locking region 158 for the sensor extend at an alignment angle in the range of approximately 100° to approximately 170° to one another.

To lock the circuit board 130 of the differential pressure sensor 128 in the locking area 158, an active connection is provided on the receiving section 154 which is in holding contact with the circuit board 130. An elastically deformable locking part 160 is designed for a reversibly detachable form-fitting connection with the sensor. If necessary, the differential pressure sensor 128, for example in the event of a defect, can thus be removed and replaced easily and, above all, without tools from the connection area of the housing parts 112, 114, in particular on the holding part 138.

The Figures 5 and 6 show similar to Fig. 1 Sectional views of the ventilation device 100, wherein the sections run in different planes of the housing 102 to illustrate the structure of the ventilation device 100. At least one of the housing parts 112, 114 is at least partially made of a foamed plastic, in particular expanded polystyrene or propylene.

Fig. 5 shows the radial fan 116 in a completed configuration, so that in particular an intake area 162 of the radial fan 116 can be seen. As can be seen from Fig. 5 As can be seen, a measuring line 164 ends in the intake area 162 of the radial fan 116, which leads from the intake area 162 in the direction of the differential pressure sensor 128 ( Fig. 1 ). The end of the measuring line 164 assigned to the intake area 162 forms the second measuring point 132', which is spaced apart from the first measuring point 132, for detecting the pressure conditions in the housing 102.

On the basis of the pressures recorded in the receiving space 122 and at the intake area 162, the differential pressure measurement is carried out by the differential pressure sensor 128, wherein the volume flow at the radial fan 116 is adjusted by adjusting the speed of the fan wheel 118 on the basis of the pressure difference, which is proportional to the volume flow generated by the radial fan 116.

Identical components are provided with the same reference symbols.

list of reference symbols

100

ventilation unit

102

Housing

104

supply air line

106

exhaust air duct

108

supply air flow

110

exhaust air flow

112

first housing part

114

second housing part

116

radial fan

118

fan wheel

120

shovels

122

recording room

124

connection area

126

recording room

128

differential pressure sensor

130

circuit board

132, 132'

measuring point

134, 136

measuring connection

138

holding part

140

surface element

142, 144

contact surface

146, 148

recess

150, 152

material bridge

154

recording section

156

insertion area

158

locking area

160

locking part

162

intake area

164

measuring line

E

level

α

insertion angle

β

alignment angle

Claims (15)

Ventilation device (100) of building services, comprising a housing (102), at least one supply air and/or exhaust air line (104, 106) arranged in the housing (102) for guiding a supply air or exhaust air flow (108, 110) through the housing (102), at least one radial fan (116) arranged in the supply air and/or exhaust air line (104, 106) with backward curved blades (120) for generating the supply air or exhaust air flow (108, 110), and at least one differential pressure sensor (128) arranged within the housing (102), which is designed to detect pressure conditions at at least two measuring points (132, 132') in the housing (102), on the basis of which a supply air or exhaust air volume flow flowing through the supply air and/or exhaust air line (104, 106) is controlled, characterized in that the housing (102) is formed from at least a first housing part (112) and a second housing part (114) corresponding to the first housing part (112) and forming a connecting region (124), wherein the differential pressure sensor (128) is arranged in the connecting region (124) of the first and second housing parts (112, 114) in a receiving space (126) defined by at least one of the housing parts (112, 114) and unaffected by the supply air or exhaust air flow (108, 110). Ventilation device according to claim 1,
characterized in that the receiving space (126) for the differential pressure sensor (128) has a connection to a section of the supply air or exhaust air line (104, 106) carrying the supply air or exhaust air stream (108, 110). Ventilation device according to claim 1 or 2,
characterized in that the receiving space (126) for the differential pressure sensor (128) is arranged above a receiving space (122) for the radial fan (116), which are preferably formed in different housing parts (112, 114). Ventilation device according to one of the preceding claims,
characterized in that the connecting region (124) is formed exactly above the radial fan (116) arranged in the housing (102). Ventilation device according to one of the preceding claims,
characterized in that the differential pressure sensor (128) is arranged on a holding part (138) which is separate from the housing parts (112, 114) and which is received in the connecting region (124) between the first and second housing parts (112, 114). Ventilation device according to claim 5,
characterized in that the holding part (138) for the differential pressure sensor (128) is provided as a separating part for at least regions of the housing parts (112, 114) of the housing (102) to be joined together. Ventilation device according to claim 5 or 6,
characterized in that the holding part (138) has a substantially flat surface element (140) extending along the connecting region (124) which has one or more recesses (146, 148) cooperating with the supply air or exhaust air line (104, 106) in the housing (102). Ventilation device according to claim 7,
wherein the recess(es) (146, 148) has a material web (150, 152) projecting approximately perpendicularly from the surface element (140), which is preferably flush with the wall of the supply air or exhaust air duct (104, 106). Ventilation device according to one of the preceding claims 5 to 8,
characterized in that the holding part (138) comprises a receiving section (154) for the differential pressure sensor (128), on which the differential pressure sensor is reversibly detachably received. Ventilation device according to claim 9,
wherein the receiving portion (154) has an elastically deformable locking part (160) that can be brought into a holding operative connection with the differential pressure sensor (128) for a reversibly releasable positive connection with the receiving portion (154). Ventilation device according to one of the preceding claims,
characterized in that the differential pressure sensor (128) has at least two measuring connections (134, 136), wherein only one of the measuring connections (134, 136) is connected in an air-conducting manner to a measuring line (164) extending in particular into the intake region (162) of the radial fan (116). Ventilation device according to one of the preceding claims,
characterized in that at least one of the housing parts (112, 114) is partially made of foamed plastic, in particular expanded polystyrene Method for assembling a ventilation device (100), in particular a ventilation device according to claim 1, comprising the steps: - providing a housing (102) consisting of at least two housing parts (112, 114) and at least one differential pressure sensor (128); - electrically connecting the differential pressure sensor (128) to a control of the ventilation device (100) using at least one connecting cable; - joining the two housing parts (112, 114) together, wherein a receiving space (126) is formed for the differential pressure sensor (128) which is unaffected by the supply air or exhaust air flow (108, 110) and defined by at least one of the housing parts (112, 114), and - Positioning the differential pressure sensor (128) in the receiving space (128) relative to one of the housing parts (112, 114) in the connection region of the housing parts (112, 114) to one another, preferably using a holding part (138) to be arranged in the connection region (124), on which the differential pressure sensor (128) is received in a particularly reversibly detachable manner. Method for maintaining a ventilation device (100), in particular a ventilation device according to claim 1, comprising the steps: - making accessible the interior of a housing (102) consisting of at least two housing parts (112, 114); - removing a differential pressure sensor (128) from the connection area of the two housing parts (112, 114), preferably removing the differential pressure sensor (128) from a holding part (138) arranged in the housing (102), on which the differential pressure sensor (128) is received in a particularly reversibly detachable manner, and - at least replacing the defective differential pressure sensor (128) with a new differential pressure sensor (128). Use of a differential pressure sensor (128) arranged on a holding part (138), wherein the holding part (138) is arranged in a connecting region (124) of a housing (102) consisting of at least two housing parts (112, 114), for detecting pressure conditions in a ventilation device (100) of domestic technology, in particular a living space ventilation device.

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