WO2017016635A1

WO2017016635A1 - Device for increasing the pressure of a fluid, in particular in the form of a pressurized-gas bottle valve

Info

Publication number: WO2017016635A1
Application number: PCT/EP2016/001149
Authority: WO
Inventors: Robert Adler; Sascha Dorner; Christoph Nagl; Johannes FRITZER
Original assignee: Linde Aktiengesellschaft
Priority date: 2015-07-30
Filing date: 2016-07-05
Publication date: 2017-02-02
Also published as: TW201712228A; DE102015009850A1

Abstract

The present invention relates to a device (1) for increasing the pressure of a fluid, in particular in the form of a pressurized-gas bottle valve (1), and to a method for increasing the pressure of a fluid. The device (1) comprises a hydraulic fluid chamber (8) in which a displacement piston (9) is arranged. By displacement of a hydraulic fluid by way of the displacement piston (9), a double diaphragm (6, 7) in a compression chamber (3) is actuated, whereby a fluid for compression is delivered from a suction duct (4) to a pressure duct (5) and is compressed. The displacement piston (9) is driven by an eccentric (10) via a drive shaft (11). The device (1) also has a pressure-limiting valve (18) which is arranged in the region of the hydraulic fluid chamber (8). Furthermore, a safety valve (19) which is regulable by way of a valve cam (20) is provided. The drive shaft has coupling means (27), for example for coupling to a drilling machine. The device is preferably used for the evacuation of pressurized-gas bottles in the domestic sector.

Description

description

Device for increasing the pressure of a fluid, in particular in the form of a

Compressed gas cylinder valve

The invention relates to a device for increasing the pressure of a fluid, in particular in the form of a compressed gas cylinder valve, and a method for increasing the pressure of a fluid by means of a device according to the invention.

Among the most widely used storage systems for hydrogen gas include

Compressed gas storage, liquid gas storage and metal hydride storage. Prior art compressed gas reservoirs have at least one valve which serves as a shut-off valve or throttling device. In addition, such valves with a

Safety device be equipped with rupture discs are mostly used. The valves are usually screwed in via threads and fixed and sealed with, for example, Teflon.

When removing gas from gas cylinders with pure gas phase inevitably decreases the pressure of the remaining gas in the bottle. An overflow into a further gas storage is therefore only possible with a pressure difference. For pressure increase according to the prior art is at the time of removal

Gas stores regularly uses a compressor that is not part of the

Gas storage is. It must therefore appropriate high-pressure lines as

Connection between compressed gas cylinder and compressor are available. In the prior art devices for the compression of gases, e.g.

Reciprocating compressor and rotary compressor known.

For refueling operations by home users, the use of external gas compressors due to the high cost, space requirements and the

Security risks are generally unfavorable.

The invention is therefore based on the object to provide a device for increasing the pressure of fluids and a method for increasing the pressure of a fluid with which in a safer, easier and more cost-effective way a removal of Gas from gas storage and in particular an overflow of gas, for example in a second gas storage is possible.

To achieve the object of the invention, a device for

Pressure increase of a fluid according to claim 1 and a method for increasing the pressure of a fluid according to claim 15 disclosed. Advantageous embodiments of

Apparatus for increasing the pressure of a fluid according to the invention are specified in the corresponding subclaims and are described below. According to claim 1, a device according to the invention for increasing the pressure of a fluid on a suction channel, a compression chamber with a volume and a pressure channel. In this case, the compression chamber can be brought into fluid communication with the suction channel, so that via the suction channel fluid in the

Compression chamber is sucked. Furthermore, the compression chamber can be brought into flow communication with the pressure channel, so that compressed fluid can be dispensed from the compression chamber via the pressure channel. In this case, the device furthermore has a double membrane, which has a first membrane and a second membrane adjacent to the first membrane. The double membrane adjoins the compression chamber and the device is adapted to the

Double membrane by means of a hydraulic fluid to deform or move so that the volume of the compression chamber of the device increases in a suction stroke, so that fluid through the suction channel into the compression chamber of the

Device is sucked, and that reduces the volume of the compression chamber of the device in a pressure cycle, so that in the compression chamber compressed fluid can be dispensed from the device via the pressure channel.

According to a particular aspect of the present invention is a

Device according to the invention integrated in a compressed gas cylinder valve and allows advantageously a fluid removal from a gas storage without a

space-consuming, expensive and by a private user safety problematic to use external compressors. Due to the particularly small dimensions, the simplicity of operation, and in particular the below-described, integrable safety devices provides such

Merging of a compressed gas cylinder valve and a device for compression or pressure increase of a fluid is an ideal solution for refueling

Gas tanks, e.g. Hydrogen tanks, by home users (home refueling) dar.

In an advantageous manner, in particular, the torque required for operating the device for increasing the pressure can be provided via a suitable coupling means, inter alia, by commercially available low-power drills or cordless screwdrivers, so that the device for

Pressure increase preferably without an internal motor manages, whereby both the size and the cost of the pressure increase device can be kept low.

Another advantage of the invention is the use of a double diaphragm to seal the hydraulic fluid chamber. This effectively counteracts mixing of working fluid and hydraulic fluid, preventing malfunctioning and thus providing greater safety to the user.

Additional safety devices are provided in particular embodiments of the invention, which are described in detail below

Pressure relief valve and a safety valve, which prevent hazards to the user by increasing pressures in the pressure increase device. The

Device may also include a heat exchanger for cooling of escaping gas, whereby the user from possible scalds through

escaping hot gas is protected. An inventive device for increasing the pressure can be used for a wide variety of gases and liquids. Adaptation for a specific fluid can be easily accomplished, e.g. By adjusting the drive power, the materials used, the volumes and the dimensioning of the heat exchanger done. The fluid to be compressed may be a gas, a gas mixture or a liquid / gas mixture, preferably a gas, more preferably hydrogen gas.

According to a further advantageous embodiment, the hydraulic fluid is a

Hydraulic fluid, more preferably an incompressible hydraulic fluid. According to a further advantageous embodiment of the invention is the

Double membrane of the device sealed so that mixing of the working fluid to be compressed and the hydraulic fluid is prevented. Furthermore, the double membrane is preferably gas-tight, so that in the

Compression chamber located gas can not leave the compression chamber through the double membrane.

According to a preferred embodiment of the invention, the device further comprises a hydraulic fluid chamber for receiving the hydraulic fluid and a

Displacement piston, which is arranged in the hydraulic fluid chamber or projects into this. In this case, the displacement piston is designed to press the hydraulic fluid to deform or move the double diaphragm against the double diaphragm. According to a further preferred embodiment, the hydraulic fluid chamber and the displacer have a circular cross-sectional area.

According to a further preferred embodiment, the device for

Pressure increase on an eccentric, which is designed to be against the

To press the displacer, so that the displacer presses the hydraulic fluid in the pressure cycle against the double diaphragm. Preferably, the displacer is displaceable by the eccentric in a periodic reciprocating motion, so that alternately present a pressure and a suction cycle. According to a preferred embodiment of the invention, the eccentric on a circular cross-sectional area or a cam shape or is formed as a cam, which may have a circumference which deviates from a circular shape

According to a preferred embodiment, the device for increasing the pressure of a fluid for driving or rotating the eccentric on a coupled to the eccentric drive shaft. Here, the eccentric can be fixed to the drive shaft. The drive shaft is preferably adapted to the eccentric by rotation of the drive shaft about its longitudinal or cylindrical axis in the said

To rotate. According to a further advantageous embodiment of the invention, the eccentric with the drive shaft in one piece, that is, integral, executed or connected to this via a different connection means. According to a further advantageous embodiment of the invention, the drive shaft is adapted to be mechanically connected or preferably coupled to a device for generating a torque.

Particularly preferably, the drive shaft of the device is designed to be coupled or driven with an external, in particular mobile drive, so that the drive shaft rotates as intended, wherein in such a drive, e.g. can be a drill or a cordless screwdriver.

According to another preferred embodiment of the invention, the

Device an inlet for introducing fluid into the suction channel or to

Connecting a first fluid container (e.g., pressurized gas bottle, see below) such that the suction passage is connectable to the first fluid container.

According to a further advantageous embodiment, the device has a

Outlet for dispensing compressed fluid or for connecting a second fluid container (or a conduit), so that the pressure channel in

Flow connection with the second fluid container or the conduit can be brought.

According to a further advantageous embodiment, the first fluid container is a gas container, preferably a compressed gas container, particularly preferably one

Pressure gas cylinder.

According to a further advantageous embodiment, the device has a suction valve which is adapted to the flow connection between the

Closing or interrupting the compression chamber and the suction channel during the pressure cycle and keep it open during the suction cycle.

According to a further advantageous embodiment, the suction valve has a first body, in particular in the form of a ball, and a (first) biasing means, preferably a (first) compression spring, on. In this case, the first biasing means is so tensioned, that the first body by means of the tensioned first biasing means is stable in a position in which the first body closes the flow connection between the compression chamber and the suction channel. Such a valve is also referred to as a spring-biased ball valve.

The suction valve may in particular also be a flutter valve, in particular of a fiber-reinforced (for example carbon fiber) plastic, in which case the first body also simultaneously forms the (second) biasing means. Such flutter valves are designed to open without separate drive due to pressure differences on the two valve sides in the forward direction and close automatically again. The flutter valve or the corresponding body in this case has elastic properties that allow the closure of the flutter valve.

According to a further advantageous embodiment of the invention, the device has a pressure valve which is designed to close or interrupt the flow connection between the compression chamber and the pressure channel during the suction cycle and to open during, in particular at the end, the pressure cycle, so that the compressed fluid can be dispensed from the compression chamber or from the device via the pressure channel.

According to a preferred embodiment of the invention, this pressure valve has a second body, in particular in the form of a ball, and a (second) biasing means, preferably in the form of a (second) compression spring on. This is the second one

Tensioning means tensioned so that the second body by means of the tensioned second biasing means is stable in a position in which the second body of the

Closes flow communication between the compression chamber and the pressure channel.

Of course, according to one embodiment of the invention, the pressure valve can also be a flutter valve (see above).

According to a further advantageous embodiment, the device has a

Heat exchanger, which is adapted to cool out of the pressure channel emerging fluid. Accordingly, that heat exchanger is arranged in particular downstream of the pressure channel or on the pressure channel. According to a further advantageous According to the inventors, the said heat exchanger is configured to use ambient air as the coolant. Furthermore, the heat exchanger can use a liquid coolant and can be configured in particular for evaporative cooling.

Due to the compression of the fluid in the device, there may be a strong heating of the fluid upon exiting the pressure channel. For example, withdrawn hydrogen gas at an inlet temperature of 20 ° C, a

Inlet pressure of 50 bar and an outlet pressure of 300 bar a

Outlet temperature at the pressure channel of 215 ° C on.

According to a further advantageous embodiment of the heat exchanger is designed so that the temperature of the emerging from the pressure channel fluid by at least 50 ° C to 175 ° C, in particular 75 ° C to 175 ° C, in particular 100 ° C to 175 ° C, in particular 125 ° C to 175 ° C, in particular 150 ° C to 175 ° C, in particular by at least 175 ° C is lowered.

According to a further preferred embodiment of the invention, the device comprises a leakage indicating means, which is adapted to a discharge of

To display hydraulic fluid from the hydraulic fluid chamber.

According to a further advantageous embodiment of the invention, the device has a pressure relief valve. In this case, the pressure limiting valve has a guided in a cylinder piston, wherein the cylinder opens into the hydraulic fluid chamber of the device. The pressure relief valve further includes a (third) biasing means for biasing the piston against hydraulic fluid in the hydraulic fluid chamber. In this case, the third biasing means is adapted to bias the piston against the hydraulic fluid so that the piston moves when exceeding a maximum pressure and thereby limits the pressure of the hydraulic fluid.

When the maximum pressure is exceeded, a part of the hydraulic fluid from the hydraulic fluid chamber flows into the part of the cylinder softer into the cylinder

Hydraulic fluid chamber opens and which by the movement of the piston in Fluid communication is made with the hydraulic fluid chamber and is made free.

According to a further advantageous embodiment, the cylinder of

Pressure limiting valve closed by a closure means relative to the surrounding atmosphere, wherein the closure means projects in particular into the cylinder and is preferably sealed by means of a sealing means. In this case, the closure means / sealing means separates the hydraulic fluid in the hydraulic fluid chamber from a rear side of the pressure limiting valve, which is loaded with atmospheric pressure.

According to a further advantageous embodiment of the invention it is provided that the third biasing means is supported on the closure means. The third

Biasing means is thus arranged in particular between the piston and the closure means, wherein in particular the piston and the closure means in the direction of the longitudinal or cylindrical axis of the cylinder face each other. As the third biasing means increases in tension, the piston moves toward the closure means and the cylinder is progressively released, allowing hydraulic fluid to flow into the cylinder to limit pressure.

According to a further advantageous embodiment of the invention, displaced by the displacer of the device volume of the hydraulic fluid displaced when exceeding the maximum pressure only the piston of the

Pressure relief valve. That is, when the maximum pressure of the hydraulic fluid is exceeded, the double diaphragm is not deformed beyond its normal position, and overshoot of allowable maximum pressure in the compression chamber and in the hydraulic fluid chamber is prevented. At the same time this prevents excessive loading of the double membrane. According to a further advantageous embodiment of the invention, said piston and / or the displacer on a circular cross-sectional area.

Here, the cross section of the piston or displacer is meant perpendicular to the direction of movement of the respective piston. According to a further advantageous embodiment, the third biasing means is configured as a third compression spring, wherein the third compression spring is adapted to press the piston against located in the hydraulic fluid chamber or in the cylinder hydraulic fluid.

The pressure limiting valve is preferably designed such that the displaced by the displacer volume can be compensated by a comparatively small stroke of the piston in the pressure relief valve. The biasing force of the third biasing means is provided only as a restoring force for the pressure relief valve. As specific values, diameter ratios between the displacer piston and the piston of the pressure limiting valve, which are less than or equal to 5 (for example between 5 and 1), in particular less than or equal to 1, in particular less than or equal to 0.5, may be mentioned here. Alternatively and additionally, by selecting a spring which is particularly long in relation to the spring travel (third biasing means), a similar effect can be achieved. For the third biasing means, ratios between spring length in a prestressed state and spring length in the compressed state in the range of preferably 0.6 to 1, preferably in the range of 0.8 to 1, may be mentioned here.

In a special application, the operating pressure is limited to 300bar. The displacement of the displacer is then e.g. 1, 6ccm. The displacer diameter is here e.g. 20mm. The piston of the pressure relief valve has e.g. a piston diameter of 12mm.

The use of a safety device according to the invention in the form of the pressure limiting valve does not cause any mechanical damage to the system in the event of pressure being exceeded. Furthermore, the pressure relief valve in the event of a pressure exceeding advantageously reusable. Furthermore, the simple design of the pressure relief valve allows a particularly favorable solution for ensuring the pressure protection. As a result, this prevents

Pressure relief valve with advantage by the lack of movement of the

Double membrane the gas flows through the valves and protects subsequent elements from a pressure exceeded. According to a further advantageous embodiment of the device for increasing the pressure, said maximum pressure is 100 bar to 300 bar, in particular 150 bar to 300 bar, in particular 200 bar to 300 bar, in particular 250 bar to 300 bar,

especially 300 bar. The upper pressure limit can also be 350 bar in single-stage operation (a device according to the invention).

According to a further embodiment of the invention it is provided to provide a device comprising several devices according to the invention (for example two), e.g. are connected in series. Herewith the possibility exists e.g. from 50 bar to 300 bar and then from 300 bar to 750 bar. According to a further advantageous embodiment, the stroke volume of the displacement piston of the pressure increase device is 1 cubic centimeter to 20 cubic centimeters, in particular 1.6

Cubic centimeter. According to a further advantageous embodiment, the diameter of the

Cross section of the displacer of the pressure increase device 10 millimeters to 50 millimeters, in particular 20 millimeters.

According to a further advantageous embodiment, the diameter of the cross section of the piston of the pressure limiting valve of the device for

Pressure increase 10 mm to 80 mm, in particular 12 mm.

According to a further advantageous embodiment of the invention, the device has a safety valve and in particular a valve cam. That's it

Safety valve can be brought into an open position in which a flow connection between the compression chamber of the device and the pressure channel of the

Device is open (with open pressure valve) and compressed fluid via the safety valve from the compression chamber enters the pressure channel, as well as in a closed position in which those flow connection between the

Compression chamber of the device and the pressure channel of the device is interrupted by the safety valve, so that no fluid passes through the safety valve in the pressure channel. The drive shaft of the device is preferably coupled to the valve cam, for example mechanically connected, such that the valve cam moves the safety valve periodically during the rotation of the drive shaft, in particular during the pressure stroke into the open position. According to a further advantageous embodiment of the invention, the valve cam and the eccentric of the device are designed to perform a common rotation.

According to a further advantageous embodiment of the invention, the valve cam has a circular cross-sectional area. Preferably, the valve cam is as

Cam formed, e.g. ground in the form of a cam. The

In particular, the cam may have a circumference that deviates from a circular shape.

According to a further advantageous embodiment, the valve cam is integrally, that is, integrally formed with the eccentric, wherein preferably the eccentric and the valve cam are fixed via a fastening means on the drive shaft or are integrally formed therewith or integrally therewith.

According to a further, alternative embodiment of the invention, the valve cam and the eccentric are formed separately, wherein the valve cam and the eccentric can be connected to each other and / or separately via a connecting means with the drive shaft or each integrally formed thereon.

According to a further advantageous embodiment, the safety valve is biased by a (fourth) biasing means, preferably in the form of a (fourth) compression spring against the valve cam, ie in the direction of the closed position, so that the safety valve moves by spring force in the closed position, unless it is moved by the action of the valve cam against the spring force in the open position. Thus, in this embodiment, the safety valve is closed during the suction cycle and opened during the pressure cycle. This results in a seal between the pressure channel and the compression chamber. By this sealing e.g. prevented in a damage, a fluid flow.

The coupling of the state of the safety valve to the suction cycle or pressure cycle of the device results from the shape of the valve cam and the shape of the eccentric, each of which is in particular firmly connected to the drive shaft. Preferably, the safety valve has a valve piston, with a first end portion which is slidably disposed in a valve cylinder. The valve cylinder preferably extends through the pressure channel and opens into a

Valve chamber through which the compression chamber is in fluid communication with the pressure channel when the safety valve is in its open position (in particular during the pressure stroke).

The valve piston is further preferably configured with one with the

Drive shaft connected valve cam cooperate, which is preferably adapted to press upon rotation of the drive shaft against the first end portion of the valve piston and thereby to move the valve piston in a first position corresponding to the open position of the safety valve.

The valve piston furthermore preferably has a second end section, which projects into the valve chamber in this first position, so that compressed fluid can pass the second end section via the valve cylinder and into the pressure channel.

The valve piston is further preferably biased by means of the fourth biasing means, which is preferably formed as a fourth compression spring, which is arranged in particular in the valve chamber and presses against the second end portion of the valve piston in the direction of a second position corresponding to the closed position of the safety valve , Due to this bias, the valve piston moves due to the valve cam shape in the suction cycle from its first position back to its second position in which the second end portion interrupts a flow connection between the valve chamber and the valve cylinder (and thus also with the pressure channel).

Preferably, the second end portion of the valve piston is cone-shaped and configured to engage in a form-fitting manner in the second position of the valve piston in a corresponding conical portion of the valve cylinder, so that that flow connection between the valve chamber and the valve cylinder or pressure channel is interrupted.

By means of the safety valve according to the invention, the control times by adapting the cam grinding or cam shape are readily adaptable. Therefore Complex functions such as those determined from measurements can be easily realized. A gas flow is only possible if, according to the cam or the cam shape is also provided that the

Safety valve is open. In the event of damage to the device for increasing the pressure of a fluid, the safety valve moves to its safe rest position

(closed position of the safety valve). Due to the low

Friction losses require only a small amount of power to drive the safety valve. Compared to electrical or pneumatic isolation valves, the safety valve according to the invention represents a particularly favorable solution for isolating the device from downstream elements.

According to a particularly advantageous embodiment of the present invention it is provided that the inlet of the device is adapted to a

Compressed gas cylinder to be connected, the device continues a

Bottle valve configured to open and close a flow connection between the inlet and the suction channel.

This embodiment of the device thus provides in other words, the

Carrying out device as part of a compressed gas cylinder valve, wherein the housing of the pressure increase device and the cylinder valve form a unit. The outlet channel of the bottle valve, which is separated from the gas storage or the compressed gas cylinder by the cylinder valve, is connected to the suction channel in such a configuration. Preferably, the inlet of the device is configured to be brought into flow communication with the compressed gas cylinder, so that gas from the compressed gas cylinder via the inlet and the cylinder valve can be dispensed into the suction channel, and so in particular the device or the housing of the device together with cylinder valve is carried by the compressed gas cylinder and is portable.

According to an advantageous embodiment, the device has a fitting associated with said cylinder valve for closing and opening the

Flow connection between the inlet and the suction channel. Preferably, the outlet of the device or the

Compressed gas cylinder valve for connecting a container or a pipe

configured, in which or in which the fluid is to be given. According to a further advantageous embodiment, the housing of the device or of the compressed gas cylinder valve preferably has a maximum diameter of 150 mm and a maximum height of 150 mm.

For example, with the present device according to the invention

Hydrogen gas from a compressed gas cylinder with an inlet pressure of 50 bar to an outlet pressure of 300 bar (single stage, in particular at most 350 bar), e.g. upon refueling the compressed gas storage of a hydrogen bicycle or vehicle using hydrogen as fuel (e.g., fuel cell). A filling amount of the compression chamber is, for example, 29 g of hydrogen gas. On the basis of an adiabatic compression process, an energy of 87.76 kJ must be supplied. Thus, with a typical drive power of the drive shaft of 250 W, a typical compressed gas storage of 1, 1 1 volume can be refueled in less than 5 minutes. In this case, assuming an isentropic process at an inlet temperature of 20 ° C, an outlet temperature of 2 5 ° C is reached. A heat exchanger thus preferably carries out a heat of about 75 kJ assuming an atmospheric pressure of 300 bar. Therefore, the heat exchanger is typically on a medium

Power of approx. 238 W dimensioned.

Another aspect of the present invention relates to a method for

Pressure increase of a fluid in the preferably an inventive

Device (or an inventive compressed gas cylinder valve) is used. In the method according to the invention for increasing the pressure of a fluid, preferably a gas, in particular of gaseous hydrogen, using a device according to the invention for pressure increase, the fluid through the

Suction channel sucked into the compression chamber in a suction cycle. In a subsequent pressure cycle, the fluid in the compression chamber is compressed and discharged through the pressure channel. In the method can under Another preferred fluid, more preferably a gas, particularly preferably gaseous hydrogen, are transferred from a first gas reservoir with a first pressure in a second gas reservoir with a second pressure, wherein the second pressure may be greater than the first pressure. Alternatively, a fluid, preferably gas, particularly preferably gaseous hydrogen, from a

Gas storage are removed.

Accordingly, the device / compressed gas cylinder valve or the method according to the invention can advantageously be used for refueling a motor vehicle with a fluid, preferably with a gas, more preferably with hydrogen.

Further features and advantages of the invention will be explained below in the description of exemplary embodiments with reference to the figures. Show it:

1 shows a sectional view of a device according to the invention for increasing the pressure;

2 shows a sectional view of a compressed gas cylinder valve according to the invention; and FIG. 3 shows a sectional view of a pressure-limiting valve according to the invention.

1 shows a device 1 for pressure increase, with a compression chamber 3, a suction channel 4, which via an inlet 14 with a first fluid container (not shown) in fluid communication, and with a pressure channel 5, via an outlet 15 with a second fluid container (not shown) in FIG

Flow connection can be brought. Correspondingly, a fluid or gas can pass from the first fluid container via the suction channel 4 into the device 1, be compressed there and output via the pressure channel 5 into a second fluid container.

The suction channel 4 and the pressure channel 5 each open into the compression chamber 3. In this case, a flow connection between the suction channel 4 and the

Compressor 3 interrupted by a suction valve 12 which is configured to open when a maximum pressure difference between the suction channel 4 and the compression chamber 3 is exceeded, so that to be compressed fluid during a Saugtakts on the suction channel 4 and the (open) suction valve 12 in the

Compression chamber 3 passes. During this, a pressure valve 13 is closed and interrupts a flow connection between the compression chamber 3 and the pressure channel 5.

The pressure valve 13 is configured to open when a maximum pressure difference between the compression chamber 3 and the pressure channel 5 is exceeded, during a pressure cycle following the suction cycle (the suction valve 12 is closed during the pressure cycle). Preferably, the two valves 12, 13 are each a spring-biased ball valve. In this case, the two valves 12,13 each have a ball 12a, 13a, which are each biased by a spring means or biasing means 23 (not visible at ball 12 in Fig. 1) against the position at which the respective

Flow connection is interrupted.

For compressing the fluid, the device 1 comprises a hydraulic fluid chamber 8 filled with a hydraulic fluid or a hydraulic fluid, e.g. in the form of a cylindrical recess which adjoins the compression chamber 3. In the hydraulic fluid chamber 8, a cylindrical displacer 9 is slidably disposed so that the displacer 9 is a cross section of

Hydraulic fluid chamber 3, which extends transversely to a direction of movement of the displacer piston 9, fills and in the direction of movement in the hydraulic fluid chamber 8 back and forth is movable. The hydraulic fluid chamber 8 is completed or limited here on a first side by an end face of the displacement piston 9. On a second side opposite the first side, the compression chamber 3 adjoins the

Hydraulic fluid chamber 8, wherein between the compression chamber 3 and the hydraulic fluid chamber 8, a double diaphragm 6.7, comprising a first diaphragm 6 and a voltage applied to the first diaphragm 6 second diaphragm 7, is arranged.

The double diaphragm 6, 7 thus separates the hydraulic fluid chamber 8 from the

Compression chamber 3 from and seals the hydraulic fluid chamber 8 on the second side against leakage of hydraulic fluid. As can be seen from Fig. 1, the double membrane 6, 7 extends along an extension plane parallel to the said cross-section of the chamber 8 and the end face of the displacement piston 9 extends. The direction of movement of the piston 9 thus extends perpendicular to

Extension plane of the double diaphragm 6, 7. When the displacer 9 is moved in its direction of movement to the opposite double diaphragm 6, 7, the double diaphragm 6, 9 is acted upon with hydraulic fluid and deflected in the direction of the compression chamber 3, which corresponds to the pressure. In the suction cycle, however, the displacer 9 in the direction of movement of the

Double diaphragm 6, 7 moves away, wherein a negative pressure arises, according to which the double diaphragm 6, 7 is moved in the direction of the hydraulic fluid chamber 8, so that the compression chamber 3 increases its volume and sucks in fluid through the suction channel 4 and the correspondingly open suction valve 12.

The diameter of the particular circular double diaphragm 6,7 is greater than the inner diameter of said cross section of the hydraulic fluid chamber 8, so that the opening of the hydraulic fluid chamber 8 on the second side through the

Double membrane 6,7 is closable. Here, the double membrane 6, 7 with a peripheral edge region on a front side of the chamber 8, which bounds that opening, sealingly. In FIG. 1, the double membrane 6, 7 is depicted in a position which corresponds to the end of the printing cycle of the device 1. Thus, the double diaphragm 6,7 is curved in the position shown in the direction of the compression chamber 3.

Further, in Fig. 1, a leak indicating means 16 for indicating leakage of hydraulic fluid from the hydraulic fluid chamber 8 is shown. The leakage indicating means 6 is arranged on a side of the double diaphragm 6, 7 facing away from the hydraulic fluid chamber 8 and is in fluid communication with that end face of the chamber 8 at an outer edge of the double diaphragm 6, 7, so that hydraulic fluid which passes by the double diaphragm 6, 7 is detectable by means of the leakage indicator means 16. For this purpose, the leakage-indicating means 16 can have a receptacle for receiving the leakage fluid, which can then be visually detected in the receptacle.

1, the device 1 further comprises a drive shaft 1 1, which extends along a longitudinal or cylindrical axis, in particular parallel to the plane of extension of the double membrane 6, 7 and in particular perpendicular to Movement direction of the displacer 9. The drive shaft 1 1 is on a side facing away from the double diaphragm 6, 7 side of the displacer 9th

is provided and is connected for driving the displacement piston 9 with an eccentric 10. The drive shaft 1 1 has in particular a circular

Cross-section and has at a free end (on an outside of the device 1) via a coupling means 27, e.g. in the form of a recess which is designed and provided for coupling the drive shaft 1 1 with a (in particular external) device for generating a torque. That said

Torque generating agent may be e.g. positively and / or non-positively engage in said recess (for example, cordless screwdriver, etc.).

The eccentric 10 is in particular provided on the drive shaft 1 1, that he moves in the pressure cycle of the device 1 when rotating the drive shaft 1 1 about the longitudinal axis of the drive shaft 1 1 to the displacer 9 and this against the hydraulic fluid in the chamber. 8 presses, so that the double membrane 6, 7 the previously sucked in the suction cycle in the compression chamber 3 compressed fluid in the pressure cycle and outputs via the pressure channel 5 with the pressure valve 13 open.

According to Figure 1, the displacer 9 may further comprise a recess 28 at a contact surface to the eccentric 10 to that contact surface between the eccentric 10 and the displacer 9 to reduce the friction

Reduce.

The device 1 for pressure increase or compression can furthermore according to FIG. 1 have a safety valve 19, which is configured to

To interrupt flow communication between the compression chamber 3 and the pressure channel 5 and to close the pressure channel 5. The safety valve 9 has for this purpose a valve piston 31, with a first end portion 32 which is slidably disposed in a valve cylinder 32 a and in particular by means of two on

End portion 32 of circumferential seals 32 b is sealed, so that the compressed fluid can not escape via the valve cylinder 32 a. The valve cylinder 32a extends with a portion through the pressure channel 5, wherein that portion has a smaller inner diameter than that portion of the valve cylinder 32a, which receives the first end portion 32 of the valve piston 31, and opens into a valve chamber 33, via which the compression chamber. 3 in Fluid communication with the pressure channel 5 is when the safety valve 19 is in its open position (in particular during the pressure cycle).

The valve piston 31 cooperates with a connected to the drive shaft 1 1 valve cam 20 which is adapted to press upon rotation of the drive shaft 1 1 against the first end portion 32 of the valve piston 31 and thereby to move the valve piston 31 in a first position, the the open position of the safety valve 19 corresponds. In this first position of the valve piston 31, a second protrudes

End portion 30 of the valve piston 31 into the valve chamber 33, so that compressed fluid can pass the second end portion 30 over the valve cylinder 32a in the pressure channel 5. The valve piston 31 is further biased by means of a (fourth) biasing means 29, preferably in the form of a (fourth) compression spring 29, which is arranged in the valve chamber 33 and presses against the second end portion 30 of the valve piston 31, toward a second position, the the closed position of the safety valve 19 corresponds. Due to this bias, the valve piston 31 moves due to the valve cam shape in the suction cycle from its first position back to its second position in which the second end portion 30 interrupts a flow connection between the valve chamber 33 and the valve cylinder 32a (and thus also with the pressure channel 5). For this purpose, the second end portion 30 of the valve piston is preferably formed cone-shaped and engages in the second position of the valve piston 31 positively in a corresponding conical portion 32c of the valve cylinder 32a, so that those flow connection between the valve chamber 33 and the valve cylinder 32a and pressure channel 5 is interrupted , The valve cam 20 may in particular be formed integrally with the eccentric 10. In the figure 1, the valve cam 20 is in a maximum raised position with respect to the valve piston 31, ie, this has been advanced by the valve cam 20 straight into its first position, against the bias of the fourth compression spring 29, so that the flow connection between the compression chamber 3 and the pressure channel 5 is opened.

Furthermore, the printing device according to the invention according to FIG. 1 has a

Heat exchanger 17, for example, downstream of the pressure channel 5 and the pressure channel 5 and upstream of the outlet 15 is arranged. The heat exchanger 17 serves to cool the compressed fluid discharged via the pressure channel 5. Finally, the device 1 for pressure increase according to Figures 1 and 3, a pressure relief valve 18 with a piston 22, a cylinder 21, and a (third) biasing means 35, preferably in the form of a compression spring 35 on.

The piston 22 of the pressure relief valve 18 is slidably disposed in the cylinder 21 and is supported via the third biasing means 35 at a

Closing means 26 a, which closes the cylinder 21 outwardly at a first end of the cylinder 21, wherein further the cylinder 21 at a

opposite second end opens into the hydraulic fluid chamber 8 of the device 1.

Furthermore, a sealing means 26 is preferably provided, which rotates on the closure means 26a and seals the cylinder 21 against the environment of the device 1.

The piston 22 is moved on reaching a maximum pressure in the hydraulic fluid chamber against the spring force of the third biasing means 35 in the cylinder 21 from the chamber 8, whereby the volume of the chamber 8 effectively increases and

is limited according to the prevailing pressure on the said maximum pressure.

FIG. 2 shows an embodiment of a further aspect of the invention, in which a device 1 according to the invention is designed as a compressed gas cylinder valve or is integrated in such a device, ie a housing 24 of the device 1 is provided which is provided with a cylinder valve 25a for shutting off the Suction channel 4 forms a unit.

In detail, this embodiment of the device 1 according to FIG. 2 furthermore has an inlet 25, which is configured to connect a compressed gas cylinder, so that the device 1 is carried, in particular, by the compressed gas cylinder 2, and an outlet 34, which is provided on the housing 24 Connecting a container to be filled (eg gas tank) or a corresponding line is formed. The inlet 25 is connected to the suction channel 4 of the compressed gas cylinder valve 2 in FIG

Fluid connection can be brought, via the valve 25 a, which is eg manually operable (eg via a corresponding valve). With the cylinder valve 25a open, fluid from a compressed gas cylinder connected to the compressed gas cylinder valve 1 can be sucked through the inlet 25 and the suction channel 4 into the device 1 or the compressed gas cylinder valve 1, can be compressed by the device 1 and through the pressure channel 5 and outlet 34 at elevated pressure dispensable.

On the housing 24, a coupling means 27 is further provided, which is connected to the drive shaft 1 1 of the device 1, and is accessible for example via a recess of the housing 24. Via the coupling means 27, for example, in the manner described above, a torque can be transmitted to the drive shaft 11, which drives the compressed gas cylinder valve 1 for the compression of the fluid.

LIST OF REFERENCE NUMBERS

Device for increasing the pressure or 1 compressed gas cylinder valve

Compressed gas cylinder 2

Compaction chamber 3

Suction channel 4

Pressure channel 5 first diaphragm 6 second diaphragm 7

Hydraulic fluid chamber 8

Displacement piston 9

Eccentric 10

Drive shaft 1 1

Suction valve 12

First body or ball 12a

Pressure valve 13

Second body or ball 13a

Inlet 14

Outlet 15

Leakage indicator means 16

Heat exchanger 17

Pressure limiting valve 18

Safety valve 19

Valve cam 20

Cylinder 21

Piston 22

Second biasing means 23

Housing 24

Inlet 25

Bottle valve 25a

Sealant 26

Closure means 26a

Coupling means 27

Recess 28 Fourth biasing means 29

Second end section 30

Ventilkoben 31

Second end section 32

Valve cylinder 32a

Seal 32b

Cone-shaped portion 32c

Valve chamber 33

Outlet 34

Third biasing means 35

Claims

Patent claims

Device for increasing the pressure of a fluid, comprising a suction channel (4), a compression chamber (3) with a volume, and a pressure channel (5), wherein

• the compression chamber

(3) can be brought into flow connection with the suction channel (4), so that via the suction channel

(4) Fluid can be sucked into the compression chamber (3), and wherein

• The compression chamber (3) can be brought into flow connection with the pressure channel (5), so that via the pressure channel

(5) compressed fluid can be discharged from the compression chamber (3), characterized in that

the device (1) has a double membrane (6,7), having a first membrane (6) and one on the first membrane

(6) adjacent second membrane (7), wherein the double membrane (6,7) adjoins the compression chamber (3) and the device (1) is designed to hold the double membrane (6,

7) to deform using a hydraulic fluid in such a way that

• The volume of the compression chamber (3) of the device (1) increases in a suction cycle, so that fluid flows into the suction channel (4).

Compression chamber (3) of the device (1) can be sucked in, and that

• The volume of the compression chamber (3) of the device (1) is reduced in a pressure cycle, so that fluid in the compression chamber (3) can be compressed and can then be discharged from the device (1) via the pressure channel (5).

Device according to claim 1, characterized in that the device (1) has a hydraulic fluid chamber (8) for receiving the hydraulic fluid and a displacer piston (9) which is in the hydraulic fluid chamber

(8) is arranged, wherein the displacement piston (9) is designed to press the hydraulic fluid to deform the double membrane (6,7) against the double membrane (6,7).

Device according to claim 2, characterized in that the device (1) has an eccentric (10) which is designed to act against the Press the displacer piston (9) so that the displacer piston (9)

Hydraulic fluid presses against the double membrane (6,7).

Device according to claim 3, characterized in that the device (1) for rotating the eccentric (10) is connected to the eccentric (10).

Has drive shaft (1 1), which is designed to set the eccentric (10) in rotation by rotating the drive shaft (11).

Device according to one of the preceding claims, characterized

characterized in that the device (1) has an inlet (14) for introducing a fluid to be compressed into the suction channel (4), and / or that

Device (1) has an outlet (15) in flow communication with the pressure channel (5) for dispensing the compressed fluid.

Device according to one of the preceding claims, characterized

characterized in that the device has a suction valve (12) which is designed to keep the flow connection between the compression chamber (3) and the suction channel (4) open during the suction cycle and to interrupt it during the pressure cycle.

Device for increasing pressure according to claim 6, characterized in that the suction valve (12) is designed as a flutter valve, or that the suction valve (12) has a first body (12a), preferably in the form of a ball, and a first biasing means, wherein the The first prestressing means can be tensioned in such a way that the first body (12a) can be held in a position by means of the tensioned first prestressing means in which the body (12a) interrupts the flow connection between the compression chamber (3) and the suction channel (4).

Device according to one of the preceding claims, characterized

characterized in that the device has a pressure valve (13) which is designed to interrupt the flow connection between the compression chamber (3) and the pressure channel (5) during the suction cycle and to open it during the pressure cycle, so that in the compression chamber (3 ) compressed fluid can be discharged from the compression chamber (3) via the pressure channel (5).

9. Device according to claim 8, characterized in that the pressure valve (13) is designed as a flutter valve, or that the pressure valve (13) has a second body (13a), preferably in the form of a second ball, and a second biasing means (23). has, wherein the second prestressing means (23) can be tensioned in such a way that the second body (12a) can be held in a position by means of the tensioned second prestressing means (23) in which the second body (13a) maintains the flow connection between the compression chamber (3). and the pressure channel (5).

10. Device according to one of the preceding claims, characterized

characterized in that the device (1) has a heat exchanger (17) which is designed to cool fluid emerging from the pressure channel (5).

11. Device according to claim 2 or one of claims 3 to 10 so far

based on claim 2, characterized in that the device (1) has a leakage indicator means (16) which is designed to indicate an exit of hydraulic fluid from the hydraulic fluid chamber (8).

12. Device according to claim 2 or one of claims 3 to 1 1 so far

based on claim 2, characterized in that the device (1) has a pressure relief valve (18) for limiting a pressure in the

Has a hydraulic fluid chamber (8), wherein the pressure relief valve (18) has a piston (22) guided in a cylinder (21), the cylinder (21) opening into the hydraulic fluid chamber (8) of the device (1), and wherein the

Pressure relief valve (18) has a third biasing means (35) for biasing the piston (22) against hydraulic fluid located in the hydraulic fluid chamber (8), the third biasing means (35) being designed to bias the piston (22) against the hydraulic fluid, that the piston (22) moves when a defined maximum pressure is exceeded

Hydraulic fluid chamber (8) moves to limit said pressure.

13. Device according to claim 4 or one of claims 5 to 12 if

based on claim 4, characterized in that the device (1) has a safety valve (19) and a valve cam (20), whereby the

Safety valve (19) can be brought into an open position in which the Flow connection between the compression chamber (3) of the device (1) and the pressure channel (5) of the device (1) is open, and in a closed position in which the flow connection between the compression chamber (3) of the device (1) and the pressure channel (5) the device (1) through that

Safety valve (19) is interrupted, and the drive shaft (1 1) of

Device (1) is connected to the valve cam (20) in such a way that the valve cam (20) moves the safety valve (19) into the open position during the printing cycle when the drive shaft (11) rotates.

14. Device according to claim 5 or one of claims 6 to 13 so far

based on claim 5, characterized in that the inlet (14) of the device (1) is designed to be connected to a compressed gas bottle (2), the device (1) further comprising a bottle valve (25a) configured to do so is to open and close a flow connection between the inlet (14) and the suction channel (4).

15. A method for increasing the pressure of a fluid using a device (1) according to one of claims 1 to 14, comprising the following steps:

(1) sucking in the fluid through the suction channel (4) into the compression chamber (3) in one suction cycle,

(2) compression of the fluid located in the compression chamber (3) in a pressure cycle, and

(3) Dispensing the fluid through the pressure channel (5) in the printing cycle.