EP1739350A1 - Variable pressure regulator for a gas blowpipe - Google Patents

Abstract

The regulator comprises a membrane (1) that is pre-loaded using the springs (2,3) among which one is directly housed in groove (51) provided in screw (5). The springs apply pressure to enable passage of small flow of pressurized gas. The screw is actuated from exterior through access hole (61) in the casing (6).

Description

The subject of the present invention is a variable pressure regulator for a gas torch.

In gas torches, pressure control devices are already known for passing a small flow of pressure gas from a first gas inlet chamber (connected to the feed bottle) to a secondary chamber of gas. gas outlet (connected to the torch burner). It is also known to place these regulators in the factory within the own torch, therefore resulting in a constant and predetermined pressure without the user having the possibility of making a subsequent adjustment in situ according to the actual needs of each operation.

The object of the present invention is a regulator integrated on the own torch which allows the user to vary the pressure of the small gas flow which is supplied from the first gas inlet chamber to the second gas outlet chamber .

• a) la membrane est pressée dans un sens (ouverture) par l'action du premier ressort fixé dans une cavité conformée dans le corps intérieur du chalumeau à gaz ;
• b) la membrane est pressée dans le sens opposé (fermeture) sur l'action d'un deuxième ressort logé de manière réglable dans une cavité conformée dans une vis ;
• c) la vis est vissée directement ou indirectement sur le corps du chalumeau et elle peut être actionnée de l'extérieur par un orifice d'accès conformé dans la structure du chalumeau à gaz.
• c) la vis dispose d'un limiteur de course qui établit les pressions minimum et maximum donnant la plage où la pression de sortie est comprise.

The regulator according to the invention integrated on the own blowpipe is provided with a membrane pretarée by means of two springs which press against the position to pass a small flow of pressure gas from the first gas inlet chamber to the second gas outlet chamber when the closing and opening forces are balanced. During its operation:

• a) the membrane is pressed in one direction (opening) by the action of the first spring fixed in a cavity formed in the inner body of the gas torch;
• b) the membrane is pressed in the opposite direction (closing) on the action of a second spring housed in an adjustable manner in a cavity formed in a screw;
• c) the screw is screwed directly or indirectly to the body of the torch and can be actuated from the outside by an access orifice shaped in the structure of the gas torch.
• c) The screw has a stroke limiter which sets the minimum and maximum pressures giving the range where the outlet pressure is included.

The pressure of the gas flow is between 0 ≤ P ≤ 4 Bar and preferably between 2 ≤ P ≤ 3 Bar.

To better understand the object of the present invention, a preferred embodiment is shown on plans, susceptible of incidental changes that will not change its foundation.

Figure 1 shows a detailed partial section of a gas torch with the variable pressure regulator, object of the invention, integrated on the own torch.

This figure shows the structure and the components and their arrangement on the torch's own body for a non-limiting example of a practical embodiment.

An exemplary non-limiting practical embodiment of the present invention is described below.

The object of the present invention is a variable pressure regulator for a gas torch.

The regulator object of the invention is integrated on the own torch and is provided with a diaphragm (1) prearranged by means of two springs (2), (3) which presses against it in counterposition to let pass a small gas pressure stream from a first gas inlet chamber (Ci) to a second gas outlet chamber (C ₂ ) when the closing and opening forces are balanced.

According to the embodiment shown - see Figure 1 - the spring (2) which presses the membrane (1) in an opening direction is fixed in a cavity (41) inside the inner body (4) of the torch to gas.

This spring (2) exerts a continuous pressure on the membrane (1) in one direction (opening) by the interposition of a pusher (7a).

The spring (3) which exerts a pressure on the membrane (1) in the opposite direction is accommodated adjustably in a cavity (51) formed in a screw (5).

This screw (5) has a conformation (52) allowing its access from the outside (by means of a traditional screwdriver, star, Allen key or any other similar tool) and is screwed directly or indirectly to the inner body ( 4) gas torch.

The screw (5) is accessible and manipulable from the outside with a suitable tool and it has a stroke limiter which establishes the two extreme stops blocking the advance or recoil of the screw (5). These stops correspond and they establish the maximum and minimum force of the spring (3) and respectively the maximum pressures (P ₂ ) and minimum (P ₁ ) of the spring (3) giving the range where the gas outlet pressure is always located.

In the embodiment shown, the screw (5) is screwed (50) in a stop (8) which in turn secures the membrane (1) screwing (80) into the inner body (4) of the gas torch.

The spring (3) exerts a continuous pressure on the membrane (1) in one direction (closing) with the interposition of a pusher (7b).

To facilitate the action on the screw (5), there is provided an orifice (61) formed in the structure (6) of the torch and axially viewing the conformation (52) of the screw (5). The minimum and maximum force of the spring (3) determines the minimum and maximum pressure giving the range where the gas outlet pressure is still located. In general, this pressure P is always between P ₁ (minimum) and P ₂ (maximum): P ₁ ≤ P ≤ P ₂ with P ₁ = 0 Bar and P ₂ = 4 Bar.

This pressure P is always between P ₁ (minimum) and P ₂ (maximum): P ₁ ≤ P ≤ P ₂ with P ₁ = 2 Bar and P ₂ = 3 Bar.

Claims (4)

Variable pressure regulator for gas torch, the regulator being integrated on the handle which is provided with an inner body (4) and a structure (6), the regulator is provided with a membrane (1) pretared by means two springs (2), (3) exerting pressure thereon in counterposition to allow a small flow of pressurized gas (P) to pass; characterized in that one of the springs (3) is adjustably housed in a cavity (51) formed in a screw (5), screwed directly or indirectly to the inner body (4) of the torch, which screw (5) can to be reached from the outside by means of an access port (61) shaped in the structure (6). Variable pressure regulator for gas torches according to the preceding claim, characterized in that the screw (5) has a stroke limiter which establishes the minimum pressures (P ₁ ) and (P ₂ ) maximum giving the range where find the outlet pressure P ₁ ≤P≤P ₂ . Variable pressure regulator for gas torch according to the preceding claims, characterized in that the pressure (P) of the gas flow rate is between 0 ≤ P ≤ 4 Bar and preferably between 2 ≤ P ≤ 3 Bar. Variable pressure regulator for a gas torch according to the preceding claims, characterized in that the diaphragm (1) is pressed in one direction (opening) by the spring (2) and in the opposite direction (closing) by the spring (3) to allow a small flow of gas to flow through a first chamber (Ci) gas inlet to a secondary chamber when the closing and opening forces are balanced.

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