DE102017011432B3 - Pressure reducing device for a cooking pot - Google Patents

Abstract

The invention relates to a pressure reducing device 1 for a cooking pot 30, in particular hybrid pressure cooker, comprising at least one lid 8 with a safety valve 6 or pressure relief valve. In order to keep the food after the cooking process in a saucepan 30 fresh, the invention provides that in a conventional saucepan or hybrid pressure cooker, a vacuum is generated, wherein a connection element sealingly placed on the safety or 6 pressure relief valve and for connecting a vacuum generating Device is provided and the lid 8, 31 has at least one sealing element, which is provided for overpressure and / or negative pressure.

Description

The invention relates to a pressure reducing device for a cooking pot, in particular hybrid pressure cooker, comprising at least one lid with a safety valve or pressure relief valve, wherein a connecting element on the safety or pressure relief valve sealingly placed and provided for connection of a vacuum generating device and the lid at least one sealing element has, which is intended to seal overpressure and / or negative pressure.

Cooking pots are usually delivered with a lid, which is used for closing. As far as it is a simple saucepan, this lid is removable at any time and also fulfills no special function. In contrast, hybrid pressure cookers are equipped with a lid and overpressure or safety valve, whereby the lid is held on the pressure cooker by suitable means. As a rule, this locking means are used, which embrace the lid and an existing edge of the pressure cooker, so that a secure fit is ensured.

From the European patent EP 1 416 837 B1 For example, a lid for a pressure cooker known which can be locked on U-shaped retaining claws on the pouring rim of a normal pot.

This measure is necessary because pressure cookers operate on the principle of Siedepunkterhöhung, so that on the one hand is required that the lid is firmly connected to the cooking pot and on the other hand, a pressure relief valve is provided, via which the working pressure can be adjusted. In addition to the pressure relief valve, a safety valve or a combination of safety and overpressure valve could additionally be provided so that the desired pressure regulation can take place and in the event of an undesired pressure increase during the cooking process, an automatic pressure reduction takes place. The pressure cookers are designed as pressure vessels and must meet appropriate safety standards.

Pressure cookers or steam cooking appliances of general type use the steam at an elevated pressure to cook the food. The use of steam as a heat transfer medium is known. For example, such Dampfgarvorrichtungen the vapor at atmospheric pressure as in US 4,011,805 A use with heat transfer by convection. From the US 4 173 215 A For example, steam is known as a heat transfer medium at atmospheric pressure, also with forced convection heat transfer. In this latter arrangement, water is introduced into the bottom of a steam chamber, and a heat source outside this chamber heats this water to produce steam. The chamber is vented to maintain the pressure within the cooking vessel at approximately atmospheric pressure. Such Dampfgarvorrichtungen can use the steam at an elevated pressure as in the well-known pressure cooker.

In addition, there is a problem that after preparing the food they should be kept fresh for a longer time.

From the DE 10 2008 009 247 A1 a lid for food containers is known, wherein the lid is provided with a circumferential elastic sealing element and a flow channel to seal the interior of the food container and to produce an overpressure in the food container can. A pressure regulation in the interior of the food container via a combined shut-off and pressure relief valve.

From the WO 2014/047360 A1 a cooking pot is known which has a lid with an annular sealing element. The sealing element in this case has a U-shaped cross-section and is inserted in a groove and at the edge of the lid. With the known designs, however, no pressure reduction can be made within the cooking pot.

The present invention is therefore an object of the invention to provide a device that allows the production of a vacuum in a conventional saucepan or hybrid pressure cooker to keep the food fresh in a saucepan.

The task is solved with a pressure reducing valve with the features of the preamble of claim 1, characterized in that the connection element consists of a bell-shaped cap and directly on the safety or pressure relief valve can be placed. Further advantageous embodiments of the invention will become apparent from the dependent claims.

The connecting element according to the invention can be placed on each pressure cooker with safety valve or pressure relief valve, in such a way that the safety valve is enclosed. With a sealing element, the connecting element is sealed against the lid, so that the space between the connection element and the lid and via the safety valve of the cooking chamber of the pressure cooker can be vacuumed. The embodiment of the sealing element takes place in such a way that a seal of overpressure but possibly also of negative pressure follows. Thus, it is possible to use after cooking the same saucepan to store the food, with the help of the connecting element within the cooking pot, a vacuum can be made so that the food can be stored for a long period without loss of flavor and vitamins.

The particular advantage is that a conventional pot can be used, which is closed with a special lid, the lid allows the conversion of a normal saucepan to a hybrid pressure cooker. An essential part of the cover here is a safety or pressure relief valve, so that when a preset steam pressure is exceeded, the steam can escape via the valve. The pressure reducing devices can be placed using the connection element on almost every cover of a hybrid pressure cooker, as far as a safety or pressure relief valve is present. The air is extracted from the pot by means of a vacuum device via the safety or overpressure valve, so that after the cooking process has finished, the food that is to be prepared can be stored for a prolonged period after it has cooled down. For this purpose, it is necessary that the lid is provided with a sealing element, for example, to perform the cooking process under pressure. A separate or modified sealing element is used to generate the negative pressure.

The connecting element consists of a cap, a check valve, a Wrasenknopf and a lock cylinder. The cap is placed directly on the safety valve or pressure relief valve, wherein the cap is provided for receiving the check valve, so that after reaching the desired vacuum, the air can not get back into the pressure cooker. The closure cylinder here serves to connect, for example, a vacuum pump and is screwed to the cap to form a unit which is axially movable spring-biased within the Wrasenknopfes.

Thus, the cap can be placed on the safety valve or pressure relief valve this is bell-shaped towards the lid and has a circumferential elastic seal, which comes to rest directly on the lid of the cooking pot. As far as the vacuum pump is used, the air between the cap and the lid and the air is sucked out of the pressure cooker via the check valve first. Here, the cap is pressed firmly by the resulting vacuum on the lid, so that a different attachment of the cap over the lid is not required. Only when an overpressure in the pressure cooker is created by heating the food or air is supplied via a second valve in the interior of the pressure cooker, the cap can be removed with steam button again.

The sealing element provided for the closure cap is firmly anchored to a base body in a recess of the closure cap and has a sealing lip projecting from the base body, which comes to lie on the outside of the lid.

In a further embodiment of the invention, it is provided that the connection element has a cylindrical end portion, which contains the check valve in a stepped bore, wherein the bore is provided at the end with a thread into which the closure cylinder can be screwed. The closure cylinder and the closure cap thus form a two-part but firmly interconnected unit, which is mounted axially movable within the Wrasenknopfes, with the aid of a compression spring is supported against the Wrasenknopf.

The check valve preferably consists of a ball check valve, which is received in a stepped bore of the cap. Above the ball check valve, the lock cylinder is screwed in, so that on the one hand the mobility of the ball is limited and on the other hand, a direct suction from the cap starting up to the top approach for a vacuum pump is present. In this case, a sealing element is additionally arranged between the upper end portion and the closure cylinder, in order to seal off the suction channel with respect to the atmosphere.

In a further embodiment of the invention it is provided that between the end portion and Wrasenknopf a free space is formed, in which a spring element rests, which is supported against the Wrasenknopf, so that the closure cylinder and the cap in the Wrasenknopf are resiliently movable up and down.

The closure cylinder also has a bore which extends from the bore of the end portion to the exposed end of the closure cylinder and serves as a connection for a vacuum pump. The Wrasenknopf itself is frusto-conical and also in the lower portion aligned to the lid section bell-shaped, so that the cap is covered and the Wrasenknopf comes to rest against the lid to support the pressure reducing device relative to the lid, when the cap rests on the lid with the elastic seal. The Wrasenknopf this limits the mobility of the cap in the axial direction and in this way allows the seal, in particular the sealing lip is pressed firmly on the lid of the pressure cooker when creating the vacuum.

The production of the necessary lid can in this case be made of metal, in particular stainless steel, but it is also possible to use a lid made of plastic, which may for example be at least partially transparent. Both types of lids must be equipped with a safety or overpressure valve, so that the pressure reduction device can be placed with the connection element. As a rule, a lid is sufficient, which is used both for cooking the food or for storing the food under vacuum. Alternatively, there is the possibility that a special lid with holding means is used only for cooking and another lid only for the production of the vacuum, so that the use is possible with normal cooking pots. Both covers must have a safety or overpressure valve.

As far as the lid is made of plastic, it may be reinforced via annular and / or radical ribs, so that a sufficient stability is ensured.

If the lid is used both for cooking and for storing food, the intended sealing element must be usable for both overpressure and underpressure. As far as a single lid is used only for storing the food, it is sufficient if the seal of this cover makes a seal at low pressure. The seal itself can be made in one piece, but it is also possible that two separate seals are provided for each cover, one being used for the overpressure and the other for the negative pressure.

In a particular embodiment of the invention it is provided that the seal has at least one sealing lip, which rests under vacuum on the inner wall of the pot. Alternatively, there is the possibility that the seal has at least one further sealing lip, which bears against the lid under vacuum. Such a seal thus enables a seal at positive and negative pressure.

In a further embodiment of the invention, it is provided that the seal of the lid is received in a peripheral groove and rests with a sealing lip on the pot inner wall, and / or that the seal of the lid rests in a recess of a plastic lid and rests with a sealing lip on the pot inner wall , This first sealing lip, which allows a seal against the inner wall pot is provided here for the generation of the vacuum.

As far as the seal located in the lid does not form a sufficient positive connection with the lid, there is also the possibility that the part of the seal, which rests in the groove or recess of the lid, a sealing lip relative to the lid or by a slotted design an additional sealing surface has opposite the lid. This particular form of seal thus has a second sealing lip or sealing surface which comes into contact with the lid so that improved sealing of the cooking pot and the lid is possible.

Alternatively, there is the possibility that the seal has an integrally formed sealing strip, which rests against the inner wall of the pot and seals the pot against pressure.

The particular advantage of the present invention is that using the pressure reducing device, a conventional cooking pot or pressure cooker can be used both for cooking food and beyond the ready-cooked food can be stored after cooling under vacuum. For this purpose, it is possible to use a vacuum pump after the cooking process to create a vacuum within the cooking pot or pressure cooker. As far as the food is cooked in a conventional manner with appropriate overpressure in the pressure cooker, a vacuum can be done after cooling to extend the period of storage.

The pressure reducing device is in this case constructed in such a way that it can be placed on any conventional safety valve or pressure relief valve, that is can be slipped open and on the existing channel of overpressure or safety valve extraction of the air contained in the pressure cooker is possible. To open the pressure cooker can compensate for this by heating the existing vacuum or via a second valve, air can be introduced into the interior of the pressure cooker. Alternatively, a movement of the overpressure or safety valve for ventilation is sufficient, this can be done by pulling on the valve seal.

The invention will be explained again with reference to the figures.

• 1 in einer geschnittenen Ansicht eine Druckminderungseinrichtung,
• 2 in einer geschnittenen Teilansicht einen Metalldeckel mit Dichtung und
• 3 in einer geschnittenen Teilansicht eine weitere Ausführungsform einer Dichtung für einen Kunststoffdeckel.

It shows

• 1 in a sectional view, a pressure reducing device,
• 2 in a sectional partial view of a metal lid with seal and
• 3 in a sectional partial view of another embodiment of a seal for a plastic lid.

1 shows a pressure reducing device 1 in a sectioned side view. The pressure reducing device 1 consists of a cap 2 , a check valve 3 , a Wrasenkopf 4 and a lock cylinder 5 , The pressure reducing device 1 is to be placed on an existing safety device 6 or pressure relief valve provided, which in a cylindrical Anformung 7 a lid 8th is included. The lid 8th can be made of metal or plastic. On the security 6 and pressure relief valve and the Anformung 7 becomes the pressure reducer 1 put on so that a sealing element 9 the cap 2 with your sealing lip 10 directly on the lid 8th to come to rest. The sealing element 9 with a basic body 11 and the molded sealing lip 10 is in a recess 12 the cap 2 recorded and anchored. To create a vacuum below the lid 8th becomes the cap 2 manually pressed down so that the sealing lip 10 in contact with the lid 8th arrives. The cap 2 is for this purpose in the lower area in the direction of the lid 8th bell-shaped and goes in the upper part in a cylindrical end portion 13 above. The end section 13 is integral with the cap 2 connected and has a stepped bore 14 on the one hand above the safety 6 and pressure relief valve opens and in an extended stepped bore 15 the check valve 3 receives. Above the check valve 3 is a threaded hole 16 present, in which the lock cylinder 5 is screwed. Between locking cylinder 5 and the end section 13 is a seal 17 arranged to prevent air intake during suction. The stepped bore 14 the cap 2 is through another hole 18 of the lock cylinder 5 led to the outwardly projecting end. The end is chamfered and serves to connect, for example, a vacuum pump. Using the vacuum pump, the air from the bore 18 , the stepped bore 14 and thus from the interior 19 the bell-shaped cap 2 as well as the security 6 or overpressure valve 6 be sucked out of the interior of the cooking pot, not shown. The production of the vacuum turns the cap 2 together with the lock cylinder 5 to the lid 8th pressed, taking over the check valve 3 with seal 20 a re-entry of air is prevented. A ventilation of the pressure cooker can only be done via another valve, which can be opened manually or if, for example, the existing food in the pressure cooker is heated, so that an overpressure arises. Once the negative pressure is released, the pressure reducing device 1 from the security 6 or pressure relief valve are removed.

So that the cap 2 and the lock cylinder 5 within the Wrath button 4 are axially movable, is the Wrasenknopf with the lower the lid 8th associated end also bell-shaped, with a conical wall 21 the bell shape is reached. Once the conical wall 21 on the lid 8th lies to rest lies the Wrasenkopf 4 opposite the lid 8th off and the cap 2 with lock cylinder 5 as a unit may be in a hole 22 of the lock cylinder 5 move axially, with a spring bias by a spring 3 which is achieved in a free space 24 is located and facing the Wrasenknopf 4 supported.

Through the vacuum, the cap is 2 together with the lock cylinder 5 against the lid 8th pressed and through the check valve 3 ensures that no air gets inside the pressure cooker. As far as an air supply via another valve, the cap can be 2 with lock cylinder 5 from the lid 8th lift off and remove manually.

2 shows in a sectional partial view of a cooking pot 30 attached lid 31 , The lid 31 is here by a holding device 32 with the edge 33 of the cooking pot 30 connected. The holding device 32 is part of a locking unit, which is on the lid 31 can be put on and for connecting cooking pot 30 and lid 31 is provided, thus a cooking process under pressure in the saucepan 30 can be done. The lid 31 is at the edge of the outer diameter of the cooking pot 30 adapted and has by a rounded shape a groove 34 on. In the throat groove 34 lies a sealing element 35 a, and all around the entire edge of the lid. The sealing element 35 consists of a beaded sealing body 36 , on which a first beaded sealing lip 37 is formed. The sealing lip 37 This is designed to be on the inside 38 of the cooking pot 30 abuts and during the cooking process allows a seal, so that an overpressure in the saucepan 30 arises. However, this Anformung can not be used for a negative pressure, because in such a case, the Anformung from the inside 38 would take off. For this reason, the sealing element 35 a sealing lip 39 on, which integral with the sealing element 35 is connected and with a sealing surface 40 immediately at the top of the cooking pot 30 is present or when generating a vacuum within the cooking pot 30 comes to the plant. For this reason, the sealing lip 39 formed much more elastic than the molded sealing lip 37 ,

Thus, there is the possibility with the sealing element 35 a seal at an overpressure in the interior of the cooking pot 30 but also in the generation of a vacuum by means of a pressure reducing device by the plant of the sealing lip 39 at the top of the cooking pot 30 in order to prevent the ingress of air into the interior of the saucepan 30 to prevent.

3 shows in a sectional partial view another solution with a plastic lid 41 which is on an identical saucepan 30 can be placed and this with its edge area 42 on the upper edge 43 of the cooking pot 30 to come to rest. About an identical holding device 32 there is the possibility of the plastic lid 41 with the cooking pot 30 to connect, so that in case of creating an overpressure inside the cooking pot 30 the plastic lid 41 can not stand out. It is in this case a plastic lid 41 which by ribs 44 is amplified, which can be partly radial and partly in the circumferential direction. The plastic lid 41 is below with a sealing element 45 equipped, which in a recess 46 the plastic lid 41 is included. The sealing element 45 consists of a sealing body 47 which is on the inside of the lid 41 on the one hand and with a projection 48 into the recess 46 intervenes. Also in this case is the sealing element 45 guided over the entire edge of the lid. An integrally formed sealing tongue 49 lies on the inside 38 of the cooking pot 30 in case of overpressure seals the lid opposite the cooking pot 30 in so far from that an existing pressure in the interior can escape only via the safety or pressure relief valve. To this sealing element 45 also to use for a negative pressure is a sealing lip 50 provided, which integral with the sealing element 45 is formed and in the case of a negative pressure at the top 43 of the cooking pot 30 to come to rest. In this way, thus an ingress of air into the interior of the cooking pot 30 prevented.

Alternatively, there is the possibility both in the first and in the second variant of the sealing element 35 and 45 an additional sealing lip in the area of the seal body 36 . 47 provide or make it so elastic by slotting that in addition a seal against the lid 31 respectively 41 can be done.

LIST OF REFERENCE NUMBERS

1

Pressure reducing device

2

cap

3

check valve

4

Wrasenknopf

5

lock cylinders

6

safety valve

7

conformation

8th

cover

9

sealing element

10

sealing lip

11

body

12

recess

13

end

14

stepped bore

15

Stepped bore area

16

threaded hole

17

poetry

18

drilling

19

inner space

20

poetry

21

wall

22

drilling

24

free space

30

cooking pot

31

cover

32

holder

33

edge

34

fillet groove

35

sealing element

36

seal body

37

sealing lip

38

inside

39

sealing lip

40

sealing surface

41

Plastic lid

42

border area

43

edge

44

ribs

45

sealing element

46

recess

47

seal body

48

head Start

49

seal tongue

50

sealing lip

Claims (11)

Pressure reducing device (1) for a cooking pot (30), in particular hybrid pressure cooker comprising at least one lid (8, 31) with a safety valve (6) or pressure relief valve, wherein a connecting element to the safety (6) or pressure relief valve sealingly placed and the Connection of a vacuum generating device is provided and the lid (8, 31) at least one sealing element (35, 45), which is provided for sealing overpressure and / or negative pressure, characterized in that the connecting element of a bell-shaped cap (2) exists and can be placed directly on the safety (6) or pressure relief valve. Pressure reduction device (1) after Claim 1 , characterized in that the connection element has a check valve (3), a Wrasenknopf (4) and a lock cylinder (5). Pressure reduction device (1) after Claim 1 or 2 , characterized in that the closure cap (2) has a circumferential elastic seal (17, 20) which comes to rest on the lid (8, 31) of the cooking pot from the outside. Pressure reducing device (1) according to one of Claims 1 . 2 or 3 , characterized in that the seal (17, 20) with its base body (11) in a recess (12) of the closure cap (2) is anchored and from the base body (11) projecting sealing lip (10). Pressure reducing device (1) according to one of Claims 1 to 4 , characterized in that the connecting element has a cylindrical end portion (13) which receives in a stepped bore (14) the check valve (3), wherein a bore (18, 22) is end provided with a thread, in which the closure cylinder (5 ) can be screwed. Pressure reducing device (1) according to one of Claims 1 to 5 , characterized in that between the end portion (13) and closure cylinder (5), a sealing element is arranged, and / or that between the end portion (13) and Wrasenknopf (4) a clearance (24) is formed, in which a spring element rests, which against the Wrasenknopf (4) is supported, so that the closure cylinder (5) and the closure cap (2) in the Wrasenknopf (4) are resiliently moved up and down. Pressure reducing device (1) according to one of Claims 1 to 6 characterized in that the closure cylinder (5) has the bore (18, 22) extending from the bore (18, 22) of the end portion (13) to the exposed end of the closure cylinder (5) and as a port for a vacuum pump is provided, and / or that the Wrasenknopf (4) is frusto-conical and formed in the lower to the lid (8, 31) aligned portion bell-shaped. Pressure reducing device (1) according to one of Claims 1 to 7 , characterized in that the lid (8, 31) is made of metal, for example made of stainless steel, or that the lid (8, 31) consists of plastic, and / or that an existing plastic lid (41) via annular and / or radial ribs (44) is reinforced. Pressure reducing device (1) according to one of Claims 1 to 8th , characterized in that the sealing element (35, 45) is formed in one piece or at least two parts, and / or that the sealing element (35, 45) at least one sealing lip (37, 39, 50), which under vacuum on a pot inner wall of the cooking pot (30) is present. Pressure reducing device (1) according to one of Claims 1 to 9 , characterized in that the sealing element (35, 45) of the lid (8, 31, 41) is received in a peripheral groove (34) and with a sealing lip (37) on the pot inner wall, or that the sealing element (35, 45 ) of the lid (8, 31, 41) rests in a recess (46) of a plastic lid and rests with a sealing lip (50) on the pot inner wall, and / or that part of the seal (17, 20) which in the groove ( 34) or recess (46) rests, a sealing lip (37, 50) relative to the cover (8, 31, 41) or by a slotted design an additional sealing surface relative to the cover (8, 31, 41). Pressure reducing device (1) according to one of Claims 1 to 10 , characterized in that the sealing element (35, 45) has an integrally formed sealing strip, which rests against the inner wall of the pot and the cooking pot (30) seals against pressure.

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