DE102010012290A1 - Device for separating condensate from respiratory gas - Google Patents

Abstract

A device for separating condensate from breathing gas is to be improved with regard to its gas tightness. To achieve this, a liftable valve disk (11) is provided, which is located between two permanent magnets (8, 15) and closes a liquid passage (7) on the first permanent magnet (8) when the collecting container (6) is removed.

Description

The invention relates to a device for the separation of condensate from breathing gas.

A device of the type mentioned is known from US 4,457,305 known. The device, hereinafter referred to as water trap, consists of an inlet channel and an outlet channel for respiratory gas, which are arranged at an angle to each other. At the lowest point there is a valve passage through a liquid passage to remove the condensate from the breathing gas channel. The liquid passage opens into a liquid container, which is pushed onto a connection flange. On the bottom surface of the liquid collection container is a pin pointing in the direction of the valve, which is to be sized in length such that a valve body lifts the valve from its valve seat through the pin when the liquid collection container is connected to the connection flange. When the valve is open, the condensate can flow out of the breathing gas channel into the liquid collecting tank. If, however, the fluid collection tank is removed from the connection flange, the valve body lies on the valve seat and the fluid passage is closed. The arranged in the liquid passage valve also serves to close the respiratory gas channel to the environment, so that when removed container no breathing gas can escape into the environment.

A disadvantage of the known water trap is that the valve body rests on the valve seat only by its own weight force and it can therefore lead to leaks and loss of breathing gas at an unfavorable positioning or change in position of the water trap when the liquid collection tank is removed.

The invention has for its object to improve a device of the type mentioned in terms of gas tightness.

The solution of the problem arises from the features of claim 1.

Advantageous embodiments of the device according to the invention are specified in the subclaims.

The advantage of the device according to the invention is that the closing force of the valve disk is reinforced by a first permanent magnet arrangement on the valve seat and the valve disk is fixed relative to the valve seat. The liquid passage leading out of the respiratory gas channel is closed by the valve plate. The valve disk is designed to be liftable and includes a closing body of ferromagnetic material. The closing body can be designed as a metal or plastic plate with ferromagnetic properties. The collecting container for the condensate separated from the respiratory gas has a second permanent magnet arrangement which is arranged such that the valve disk is located in the collecting container connected to the respiratory gas channel, between the first permanent magnet arrangement and the second permanent magnet arrangement. The permanent magnets are matched to one another in such a way that the second permanent magnet arrangement exerts a greater magnetic force on the valve disk than the first permanent magnet arrangement. As a result, the valve disk is attracted by the second permanent magnet arrangement and the valve disk lifts off from the valve seat, as a result of which the fluid passage is open and condensate can flow out of the respiratory gas channel into the collecting container. If, however, the collecting container and thus the second permanent magnet arrangement are removed, the valve disk is attracted by the first permanent magnet arrangement and the liquid passage is closed.

Conveniently, the first permanent magnet arrangement is designed as an annular permanent magnet, wherein the liquid passage extends through the center of the annular permanent magnet. It is also possible to carry out the first permanent magnet arrangement of individual, arranged in a circle permanent magnet and to provide the liquid passage such that it passes through the center of the circle.

Conveniently, the valve plate consists of a membrane with attached closing body of ferro-, ferri-, para-, or permanent magnetic material.

Conveniently, the second permanent magnet arrangement is designed as an annular or circular permanent magnet.

An embodiment of the invention is shown in the figure and explained in more detail below.

Show it:

1 a water trap according to the invention in longitudinal section,

2 a side view of the breathing gas duct with the connection flange;

3 a sectional view AA after the 2 .

4 a side view of the water trap,

5 a sectional view CC according to the 4 .

6 a sectional view BB according to the 4 ,

1 schematically illustrates the structure of a water trap according to the invention 1 in longitudinal section. A respiratory gas channel 2 with a gas inlet 3 and a gas outlet 4 is lowered down and is at the lowest point via a cylindrical channel section with a connecting flange 5 a collection container 6 connected for condensate. Starting from the lowest point of the respiratory gas channel 2 runs in the region of the cylindrical channel section a liquid passage 7 from the respiratory gas channel 2 through the center of an annular, first permanent magnet 8th in the collection container 6 , At the bottom of the channel section is a membrane 9 with a ferromagnetic closing body 10 attached, which together a valve disk 11 form and in cooperation with the first permanent magnet 8th as a valve seat, a shut-off valve 12 within the fluid passage 7 are. The closing body 10 is at the bottom of the membrane made of an elastomer 9 attached, leaving the membrane 9 in the closed position of the shut-off valve 12 on the first permanent magnet 8th rests and by their inherent elasticity performs a sealing function. On the outside of the closing body 10 There are several, circularly arranged holes 13 that also in the membrane 9 are present through the condensate, which is above the membrane 9 located in the collection container 6 can drain away. The collection container 6 has a centrally located pin 14 at its top with a second, annular permanent magnet 15 is provided. The valve plate 11 is located between the first permanent magnet 8th and the second permanent magnet 15 , The permanent magnets 8th . 15 are coordinated so that the second permanent magnet 15 a larger magnetic force on the closing body 10 exerts as the first permanent magnet 8th , When the collection container 6 at the respiratory gas channel 2 is located, the closing body 10 due to the larger magnetic force of the second permanent magnet 15 attracted and the shut-off valve 12 it is open.

In the 1 is the shut-off valve 12 illustrated in the open position. That in the respiratory gas channel 2 accumulated condensate can pass through the liquid passage 7 and about the holes 13 in the collection container 6 flow away.

2 shows a side view of the breathing gas channel 2 with removed collecting container 6 ,

In the 3 is the sectional view AA after the 2 illustrated. The same components are given the same reference numbers 1 Mistake. With removed collection container 6 becomes the closing body 10 of the valve disk 11 from the first permanent magnet 8th attracted and the membrane 9 closes the fluid passage 7 , The shut-off valve 12 is closed.

4 shows a side view of the water trap 1 with the collection container 6 ,

In the 5 is the sectional view CC according to the 4 illustrated, looking at the first permanent magnet 8th with the centrally located liquid passage 7 ,

6 shows the sectional view BB after the 4 overlooking the membrane 9 and those behind the membrane 9 lying closing body 10 , In the closing body 10 and the membrane 9 There are four holes 13 , for the discharge of the condensate.

• • Eigengewichtskraft des ferromagnetischen Schließkörpers 10 mit Membran 9, F_g[N] = m[kg]·g[ m / s²] (1) g = Gravitationskonstante
• • Druckkraft auf den ferromagnetischen Schließkörper 10, die durch den herrschenden Druck im Atemgaskanal 2 hervorgerufen wird, F_d[N] = p[ N / m²]·π·R 2 / 2[m²] (2)
• • Rückstellkraft durch die Membran 9, auf der sich der ferromagnetische Schließkörper 10 befindet. F_f[N] – D[ N / m]·s[m] (3)

At the shut-off valve 12 . 1 , the following forces have to be considered:

• • Dead weight of the ferromagnetic closing body 10 with membrane 9 . F _g [N] = m [kg] · g [m / s 2] (1) g = gravitational constant
• • Pressure on the ferromagnetic closing body 10 caused by the prevailing pressure in the respiratory gas channel 2 is caused F _d [N] = p [N / m 2] · π · R 2/2 [m ² ] (2)
• • Restoring force through the membrane 9 on which the ferromagnetic closing body 10 located. F _f [N] - D [N / m] * s [m] (3)

μ₀ = magnetische FeldkonstanteThe magnetic force of the first permanent magnet 8th can be calculated with the help of formula (4): Example calculation for a ring magnet:

μ ₀ = magnetic field constant

In addition, the magnetic force of a magnet depends on other factors, for. B. the thickness of the ferromagnetic closure body 10 , Thin iron sheet adheres worse, thick flat iron sticks better; Unalloyed, low-carbon steel adheres better than high-alloy chrome steel. When designing the magnets, these factors must be considered.

The magnetic flux density can be calculated by the formula (5) for a ring magnet:

The sum of all on the ferromagnetic closing body 10 acting forces must be smaller than those of the first permanent magnet 8th caused magnetic force F _mag1 . F _g + F _d + F _f <F _mag1 (6)

To the closing body 10 from the first permanent magnet 8th to solve and so the fluid passage 7 to open, must for the magnetic force F _{mag1 of} the first permanent magnet 8th and the second permanent magnet 15 with the magnetic force F _{mag2 the} following applies: F _mag1 <F _mag2

When using two equally strong permanent magnets must pass through the membrane 9 an artificial distance can be created so that the closing body 10 not directly on the first permanent magnet 8th is present, but in between a distance remains. personnel F _mag1 : Magnetic force of the first permanent magnet 8th [N] F _mag2 : Magnetic force of the second permanent magnet 15 [N] F _g Dead weight of the closing body 10 with membrane 9 [N] F _d thrust [N] F _f Diaphragm restoring force [N] Table [1]: Forces

Tabelle [2]: Variable

Table [2]: Variable

LIST OF REFERENCE NUMBERS

1

Water falls

2

Breathing gas channel

3

gas inlet

4

gas outlet

5

flange

6

Clippings

7

liquid passage

8th

first permanent magnet

9

membrane

10

closing body

11

valve disc

12

shut-off valve

13

drilling

14

pen

15

second permanent magnet

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 4457305 [0002]

Claims (7)

Device for separating condensate from respiratory gas with - a respiratory gas channel ( 2 ), - one with the respiratory gas channel ( 2 ) connectable collecting container ( 6 ), - a liquid passage ( 7 ) between the respiratory gas channel ( 2 ) and the collecting container ( 6 ), - a shut-off valve ( 12 ) in the liquid passage ( 7 ), which - a first permanent magnet arrangement ( 8th ) as a valve seat, - a second permanent magnet arrangement ( 15 ) at the collecting container ( 6 ), - a liftable valve disc ( 11 ) made of ferromagnetic material between the first permanent magnet arrangement ( 8th ) and the second permanent magnet arrangement ( 15 ) in such a way that with the respiratory gas channel ( 2 ) associated collecting container ( 6 ) the second permanent magnet arrangement ( 15 ) a the valve plate ( 11 ) from the valve seat ( 8th ) exerts lifting magnetic force. Device according to claim 1, characterized in that the first permanent magnet arrangement ( 8th ) is designed as an annular permanent magnet and that the liquid passage ( 7 ) than through the center of the annular permanent magnet ( 8th ) is formed running. Device according to claim 1, characterized in that the first permanent magnet arrangement ( 8th ) consists of individual, arranged in a circle permanent magnet and the liquid passage ( 7 ) is formed as running through the circle center. Device according to one of claims 1 to 3, characterized in that the valve disc ( 11 ) from a membrane ( 9 ) with attached closing body ( 10 ) consists of ferro-, ferri-, para- or permanent magnetic material. Device according to one of claims 1 to 4, characterized in that the second permanent magnet arrangement ( 15 ) is formed as an annular - or circular permanent magnet. Device according to one of claims 1 to 5, characterized in that the magnetic force of the second permanent magnet arrangement ( 15 ) greater than that of the first permanent magnet arrangement ( 8th ). Device according to one of claims 1 to 6, characterized in that the closing body ( 10 ) to the first permanent magnet arrangement ( 8th ) a greater distance than the second permanent magnet arrangement ( 15 ) having.

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