The invention relates to a pressure compensation element according to the preamble
of claim 1 and an arrangement according to the preamble of
Inside tightly formed housing can
with a change in the climatic conditions undesirable condensation
be formed. To prevent the formation of condensation, is
known, the housing
to provide with a pressure compensation element.
Pressure compensation element is in an individually adapted bore
screwed in the housing.
Inside the pressure balance element is an air-permeable however
Membrane (semipermeable) arranged, which separates the inside of the housing from the outside of the housing.
Humidity can escape from the housing through the membrane.
In contrast, sprayed water is kept away from the inside of the housing by the membrane.
Pressure compensation elements consist of a receiving part in which
the membrane is housed, and a lid, which serves as impact protection element
serves. The lid is attached either to the receiving part,
glued or welded with this. Im built into the housing
Condition of the pressure compensation element, the lid protects the receiving part
and the membrane from mechanical influences from outside,
such as unintentional bumps or blows. To the
Impact resistance of such pressure compensation element made of plastic
continue to increase
These were trained more massive. The pressure compensation element should
relative to the usable membrane area
be made small so as not to hinder other component.
As a result, pressure compensation elements that were particularly impact-resistant and
Nevertheless, should be made small, made of metal. such
However, pressure compensation elements are significantly more expensive than pressure equalization elements
made of plastic. In addition, it is desirable, too
to further improve the protection of pressure compensation elements made of metal.
The invention is therefore based on the problem, a pressure compensation element
provide that provides high protection against external influences and at the same time
is in production.
this problem by a pressure compensation element with the features
of claim 1 and by an arrangement with the features
of claim 19.
Receiving part and the impact protection element formed as a one-piece capsule
could, the protection of the pressure compensation element against punches and
Small construction significantly increased. The protection affects
especially in the access of the housing occlusive state
of the pressure compensation element. The capsule interior is thereby of
the impact protection element facing away from the capsule with the
while the capsule forms the sole outer shell of the pressure compensation element.
This means that no
further, separate elements of the pressure compensation element outside
the capsule are arranged. The pressure compensation element points
in particular no additional
Cover on, which in turn protects the impact protection element from shocks. to
of the capsule interior and above
indirectly the interior of the housing has
the impact protection element in an advantageous embodiment, at least
a breakthrough on.
An advantageous embodiment of the invention is the impact protection element
rounded. The groundbreaking of the capsule interior surface of the impact protection element
has in particular the shape of a ball cap or a cap
an oval shaped body
on. The attack surface
the impact protection element is thereby minimized.
a particularly preferred embodiment, the pressure compensation element
a labyrinth system that places the membrane in front of the capsule interior
penetrating foreign bodies
Through the breakthrough of the impact protection element in the capsule interior
invading foreign bodies,
such as a wire or the fluid of a high-pressure cleaner,
no longer on a straight path and with unchecked power
hit the membrane. The foreign bodies are preferred, based
on their entry into the capsule interior, within the labyrinth system
at least 90 degrees, better 120 degrees, even better 150 degrees
and in particular distracted by at least 180 degrees. The direction of movement
a foreign body penetrated into the labyrinth system becomes at least
temporarily by the aforementioned angle relative to the direction of entry
distracted. The distraction can also be the result of several previous
Be individual distractions.
The invention further provides an arrangement with a pressure compensation element according to the invention and a cable gland of a housing, wherein the outer shape of the pressure compensation element is formed complementary to the inner shape of the cable gland. In this case, the pressure compensation element is preferably by means of cap nut fixed in the cable gland. The cable gland for its part preferably has a high impact and impact resistance. By accommodating the pressure compensation element in such a cable gland, the protection of the pressure compensation element is largely taken over by the cable gland. The self-protection of the pressure compensation element is limited only to the surfaces that are not enclosed by the cable gland. As a result of this embodiment, the protection of the pressure compensation element from external influences is thus also indirectly increased.
the pressure compensation elements are mass-produced in series,
because the inner diameter of cable glands is normalized and
only the capsule of the pressure compensation element must be adapted thereto. The housing point
usually one or more holes on, for such cable glands
normalized. It is therefore no longer necessary for a variety
different holes in the wall of the housing respectively
individually adapted in scope
To provide pressure compensation elements. The manufacturing costs
the pressure compensation elements can be further reduced.
with existing cable gland cost-effective with a matching pressure compensation element
Pressure compensation element preferably has the outer shape of a conventional
Blind stopper for
the respective cable gland on. Advantageously, the pressure compensation element
with the exception of the impact protection element completely from the cable gland
taken, the impact protection element on the cap nut
adapted outer shape
having. As a result, the attack surface of the pressure compensation element
Actions from outside
of the housing
Details and advantages of the invention will become apparent from the dependent claims and the
in the figures schematically illustrated embodiments, hereinafter
to be discribed; show it:
1 an inventive arrangement in a sectional view, with a pressure compensation element, inserted in a cable gland,
2 the pressure compensation element 1 in an enlarged view,
3 the pressure compensation element 1 in a representation illustrating the individual parts,
4 an inventive pressure compensation element for screwing in a sectional view,
5 another inventive pressure compensation element for screwing in a sectional view and
6 the object out 5 in the plan view.
Hereinafter, the same or equivalent elements of the invention are uniformly provided with a reference numeral. 1 to 3 show a total of an inventive pressure compensation element 2 with a receiving part 4 in which a semipermeable membrane 6 is arranged. The pressure compensation element 2 has an impact protection element 8th on, that the receiving part 4 and the membrane 6 against mechanical influences from outside the pressure compensation element 2 protects. Here are the receiving part 4 and the impact protection element 8th as a one-piece capsule 10 formed, which is the outer shell of the pressure compensation element 2 forms.
The capsule 10 points in the area of the impact protection element 8th breakthroughs 12 for ventilation of the capsule interior 14 on.
1 shows an arrangement according to the invention 15 with a pressure compensation element 2 in a cable gland 16 used and with a cap nut 18 is fixed. The outer shape of the pressure compensation element 2 is complementary to the inner form of the cable gland 16 educated. The impact protection element 8th is on the outside, so on the side facing away from the capsule interior, partially rounded. The rounding is modeled on the nature of a ball cap. In this case, the pressure compensation element 2 with the exception of the impact protection element 8th completely from the cable gland 16 recorded and the impact protection element 8th has one on the cap nut 18 adapted outer shape. By this configuration, the attack surface of the pressure compensation element 2 clearly limited.
The impact protection element 8th can, as shown, on the cap nut 18 rest and thereby slipping in the pressure compensation element 2 into the cable gland 16 prevent. In an embodiment not shown here, the impact protection element 8th but also completely in the opening of the cap nut 18 be housed. As a result, the attack surface of the pressure compensation element 2 further reduced.
For adjusting the pressure compensation element 2 to the cable gland 16 is the recording part 4 round cylindrical and has also one to the respective cable gland 16 adjusted length. For better fixation of the pressure compensation element 2 in the cable gland 16 has the receiving part 4 outside circumferential projections 20 at the height of a seal 22 the cable gland 16 on.
The pressure compensation element 2 points between the lid or impact protection element 8th and the Memnran 6 a labyrinth system 24 on, that's the membrane 6 in front of the capsule interior 14 invading foreign bodies protects. The protection refers to a protection against the breakthroughs 12 in the capsule interior 14 passing foreign bodies. The labyrinth system 24 has a first chicane 26 and another chicane 28 on. The first chicane 26 is between the impact protection element 8th and the membrane 6 arranged and protects the membrane 6 from direct exposure to the capsule interior 14 passing foreign bodies. Already by the first chicane 26 So for example, through the breakthroughs 12 foreign body entering the capsule interior is not in a straight trajectory on the membrane 6 meet, but gets distracted. For this purpose fills the first chicane 25 the cross section of the capsule interior 14 below the impact protection element 8th full surface except one or more channels 30 , The channels 30 are outside of straight lines between the breakthroughs 12 the impact protection element 8th and the membrane 6 arranged. This staggered arrangement to the breakthroughs 8th or the membrane 6 prevents the previously described direct action of the capsule interior 14 passing foreign bodies on the membrane 6 ,
Preference is given to several channels 30 provided on the one hand by the first chicane 26 and on the other hand, from the inner wall 32 the capsule 10 be limited. In the case of a capsule 10 , their recording part 4 cylindrically shaped, has the first chicane 26 a likewise round cross section of the same diameter as the receiving part 4 and has outwardly distributed recesses as channels 30 on. By this arrangement, on the one hand, the blocking function of the first chicane 26 ensured and on the other hand, enough air can be the first chicane 26 happen.
Between the first chicane 26 and the impact protection element 8th is at least a first spacer 34 arranged. In the illustrated preferred embodiment, the spacer is 34 in one piece with the first chicane 26 connected. First spacer 34 and first chicane 26 form a one-piece assembly. The assembly can be manufactured and assembled inexpensively.
The further chicane 28 is formed so that they one at the first chicane 26 at least temporarily deflected by at least 90 degrees, but better by 115 degrees and in particular by 130 degrees. The further chicane fills the cross section of the capsule interior 14 below the first chicane 26 entire surface except one opening 36 that are outside straight lines between the output of the channels 30 and the membrane 6 is arranged.
The first chicane 26 points to the impact protection element 8th opposite side a circumferential first projection 38 on, whereas the other chicane 28 on the first chicane 26 facing side another advantage 40 having. Here stands the first projection 38 towards the membrane 6 over the further lead 40 out. As a result, a must enter the labyrinth system of the foreign body, the first projection 38 has passed, change its direction of movement significantly, to the other projection 30 to get past and onto the membrane 6 hold true. Between the first chicane 26 and another chicane 28 are more spacers 42 arranged. In the illustrated, preferred embodiment, the further spacers 42 as rearward extensions of the first spacers 34 educated. The first chicane 26 as well as the first spacers 34 and the other spacers 42 form a one-piece assembly with the advantages mentioned above.
The further chicane 26 has a revolving hold-down 44 on. The membrane 6 on the one hand by the hold-down 44 and on the other hand from a membrane carrier 46 fixed directly or indirectly. This fulfills the further chicane 28 in addition to the labyrinth function, the function of a holder for the membrane also exists in one component 6 ,
The first advantage 38 and the further advantage 40 are each frustoconical in the facing area. The lateral surfaces of the truncated cone are parallel to each other. This may cause the further chicane 28 be formed in a simple manner so that the opening 36 the further chicane 28 to hold down 44 extended funnel-shaped. Through this funnel-shaped extension a free membrane surface is ensured, which in an advantageous manner relative to the available cross-section of the receiving part 4 is formed large. Despite the small design of the pressure compensation element 2 This is the necessary air exchange through the membrane 6 ensured.
Between the hold down 44 and the membrane 6 is a sealing ring 48 made of an elastic material. This has at the same time a spring function in addition to the sealing function. This is that the membrane 6 between the hold down 44 and the membrane carrier 46 on the one hand is firmly enough clamped to slippage of the membrane 6 on the other hand, but not in relation to the membrane 6 harder materials of the blank holder 44 or the membrane carrier 46 is damaged. In addition, the spring function is to keep all loose parts inside the capsule 14 to prevent a wobble and thus an undesirable knocking against each other. A noisy rattling of the pressure compensation element 2 is thereby desirably avoided.
4 and 5 each show further embodiments of a pressure compensation element according to the invention 2 , Unlike in the 1 to 3 embodiment shown have the pressure compensation elements 2 in the 4 and 5 an external thread 50 on the receiving part 4 on. With the help of external thread 50 can these pressure compensation elements 2 be screwed into holes in a housing. The fixation and sealing of the pressure compensation element 2 takes place in a conventional manner, for example by counter nuts not shown in the figures and a sealing ring.
The impact protection element 8th has the shape of a regular hexagon in cross-section and is adapted in size to conventional hex wrench. The pressure compensation element 2 is doing this with the help of a on impact protection element 8th engaging Allen key screwed into the housing.
In 5 and 6 is another embodiment of the pressure compensation element 2 shown. How out 6 this one does not show up to the capsule interior 14 continuous notch 52 on. The pressure compensation element 2 is screwed with a tool in the opening of a housing. The tool engages in the aforementioned notch 52 the impact protection element 8th one. 6 also shows the arrangement of the breakthroughs 12 the impact protection element 8th , This arrangement is maintained substantially in the embodiments described so far.
How out 1 to 5 seen, the capsule points 10 at the impact protection element 8th opposite side a capsule opening 54 on, through which the capsule interior 14 with the labyrinth system 24 , the sealing ring 48 , the membrane 6 and the membrane carrier 46 is fillable. These in the capsule interior 14 accommodated, loose parts ( 24 . 48 . 6 . 46 ) become one end of the impact protection element 8th from falling out of the capsule 10 prevented. The membrane carrier 46 also has a groove 56 on that to the capsule inside 32 and the capsule opening 54 is open. The groove 56 can circulating or even partially introduced on the membrane support 46 be provided. After filling the capsule interior 14 with the aforementioned loose parts ( 24 . 48 . 6 . 46 ) becomes part of the capsule 10 in the area of the capsule opening 54 by thermal deformation in the groove 56 pressed and with the membrane carrier 46 merged. The groove 56 can also be part of a separate closure element, not shown in the figures, that on the membrane support 46 is supported. The fixation of the membrane carrier 46 at the capsule 10 but can also be done by gluing, jamming, wedging or a snap closure or the like.
In the figures, the groove 56 just not yet with the capsule 10 welded state shown. With the help of the weld in the groove 56 are those in the capsule interior 14 accommodated loose parts ( 24 . 48 . 6 . 46 ) in a simple and cost effective manner to fall out of the capsule opening 54 prevented. In addition, when welding the capsule 10 in the groove 56 on the loose parts in the capsule interior 14 a slight pressure towards the impact protection element 8th applied. As a result, the sealing ring 48 slightly compressed and fixed in this state when cooling the weld bead. In the welded state of the pressure compensation element 2 become the loose parts ( 24 . 48 . 6 . 46 ) in the capsule interior 14 prevented from unwanted shaking, as previously described.