WO2012113946A1 - Oxygen compressor - Google Patents
Oxygen compressor Download PDFInfo
- Publication number
- WO2012113946A1 WO2012113946A1 PCT/ES2012/000037 ES2012000037W WO2012113946A1 WO 2012113946 A1 WO2012113946 A1 WO 2012113946A1 ES 2012000037 W ES2012000037 W ES 2012000037W WO 2012113946 A1 WO2012113946 A1 WO 2012113946A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cylinders
- oxygen
- compression
- compressor
- relation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B25/00—Multi-stage pumps
- F04B25/005—Multi-stage pumps with two cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
Definitions
- the present invention is related to the packaging of oxygen, in bottles or containers similar containers, proposing a compressor that allows the compression of oxygen, for packaging in an advantageous way.
- the application gas is introduced in the same tablets, using compressor equipment formed by cylinders driven by a rotary gearmotor or by a hydraulic or pneumatic cylinder in linear motion, generally comprising two compression stages that perform a progressive compression, so that the first stage compresses to a certain pressure and the second stage completes the compression to the packaging pressure.
- the compression is performed in a constant manner, and there may be gaps between the compression and the supply of the gas supply, when this supply varies.
- gas turbulence occurs, which leads to alterations of the electronic measuring devices that are arranged in the equipment, resulting in distorted measures obtained.
- a compressor is proposed that allows oxygen compression to be packaged to be packaged under advantageous conditions, solving the drawbacks of conventional devices of said function.
- This compressor object of the invention conventionally consists of two compression stages connected in series, each of said stages comprising a compression cylinder and a cooler, with a Rotary or linear drive motor that acts on the movement of the pistons of both cylinders, so that the oxygen that is supplied to be compressed passes through the first compression stage, where precompression and cooling occurs, and then goes through the second stage of compression, where there is more intense compression and other cooling.
- the cylinders of the compression stages are arranged electrically grounded, whereby the static electricity and EDM generated by the operation, by friction of said compression cylinders, is discharged without remaining accumulated, and consequently the risk of explosions and broken shafts and rods.
- the actuation of the compression cylinders is established by a motor-reducer, in relation to which a frequency inverter is arranged, which in combination with a pressure sensor adjusts the operation of the compression according to the supply of oxygen in each moment, thus avoiding gaps between the supply of oxygen and compression.
- a motor-reducer in relation to which a frequency inverter is arranged, which in combination with a pressure sensor adjusts the operation of the compression according to the supply of oxygen in each moment, thus avoiding gaps between the supply of oxygen and compression.
- the cylinder heads of the cylinders are provided with a circuit of coolant and double jacket, so that the oxygen comes out at a low temperature and lengthens the life of the compressor, making it easier to maintenance operations on said chillers and cylinders.
- said compressor object of the invention results in very advantageous characteristics for the function to which it is intended, acquiring its own life and preferential character with respect to conventional compressors of the same application.
- Figure 1 shows a diagram of the functional assembly of the compressor object of the invention, with actuation of the compression cylinders by a motor-reducer.
- Figure 2 is a perspective of the compressor according to an exemplary embodiment.
- Figure 3 is an enlarged perspective of a compression stage of the recommended compressor.
- Figure 4 is a sectional view of the previous compression stage.
- Figure 5 is an enlarged section of the cylinder of the compression stage.
- Figure 6 is a view of the compressor assembly with the ground connections of the compression cylinders and the parts related thereto.
- the object of the invention relates to a compressor for compressing the oxygen intended to be packaged in consumer containers, comprising two compression stages formed by two cylinders (1 and 2), which are operated by the same actuator (3). , to perform, by means of the cylinder (1) of the first stage a precompression and with the cylinder (2) of the second stage a compression complement up to the packing pressure.
- the compression stages in turn comprise two coolers (4 and 5), which are arranged externally with respect to the respective cylinders (1 and 2), so that the oxygen to be compressed enters the first cylinder (1) and at the outlet It passes through the corresponding cooler (4), then entering the second cylinder (2) and at the outlet of the latter passes through the respective cooler (5), from where it is directed to the packaging, as shown in Figure 1.
- the actuation of the compression cylinders (1 and 2) is carried out by means of an actuator (3) formed by a gearmotor, in relation to which a frequency inverter (not shown) is arranged, and in relation thereto a pressure sensor that measures the oxygen pressure that is supplied to be compressed, so that, depending on the supply (6) of the oxygen at each moment, the frequency inverter adjusts the actuation of the cylinders (1 and 2), preventing the occurrence of mismatches between said oxygen supply (6) and compression.
- a frequency inverter (not shown) is arranged, and in relation thereto a pressure sensor that measures the oxygen pressure that is supplied to be compressed, so that, depending on the supply (6) of the oxygen at each moment, the frequency inverter adjusts the actuation of the cylinders (1 and 2), preventing the occurrence of mismatches between said oxygen supply (6) and compression.
- said actuation of the cylinders (1 and 2) can also be carried out by means of an actuator (3) formed by a hydraulic cylinder with linear movement, placed between the two cylinders (1 and 2).
- ground connections are also provided by cables (7), as seen in Figure 6, whereby the static electricity generated by said cylinders (1 and 2) in operation it is discharged to ground, thus avoiding accumulations of static electricity and EDM and with it the danger of explosions due to them.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
Description
COMPRESOR DE OXIGENO OXYGEN COMPRESSOR
Sector de la técnica Technical sector
La presente invención está relacionada con el envasado de oxigeno, en botellas o recipientes contenedores semejantes, proponiendo un compresor que permite realizar la compresión del oxigeno, para el envasado de una manera ventajosa. The present invention is related to the packaging of oxygen, in bottles or containers similar containers, proposing a compressor that allows the compression of oxygen, for packaging in an advantageous way.
Estado de la técnica State of the art
Es conocido el envasado de oxigeno y otros gases de manera comprimida en botellas metálicas o recipientes semejantes, para el consumo en las aplicaciones que se requiera, realizándose dicho envasado a partir de un suministro desde una máquina de producción o desde un depósito cisterna. It is known the packaging of oxygen and other gases in a compressed manner in metal bottles or similar containers, for consumption in the required applications, said packaging being made from a supply from a production machine or from a tank tank.
Para el envasado en esos recipientes de consumo, el gas de aplicación se introduce en los mismos comprimido, utilizándose para ello un equipo compresor formado por unos cilindros accionados por un motorreductor de giro o por un cilindro hidráulico o neumático en movimiento lineal, comprendiendo generalmente dos etapas de compresión que realizan una compresión progresiva, de manera que la primera etapa comprime hasta una cierta presión y la segunda etapa completa la compresión hasta la presión de envasado. For the packaging in these consumption containers, the application gas is introduced in the same tablets, using compressor equipment formed by cylinders driven by a rotary gearmotor or by a hydraulic or pneumatic cylinder in linear motion, generally comprising two compression stages that perform a progressive compression, so that the first stage compresses to a certain pressure and the second stage completes the compression to the packaging pressure.
Dichos equipos de compresión de gases presentan, sin embargo, los inconvenientes siguientes: Such gas compression equipment, however, has the following disadvantages:
-Los cilindros de compresión generan en su funcionamiento electricidad estática y electroerosión, de lo cual se deriva un peligro de explosiones y genera rotura prematura por envejecimiento de los materiales, debido a la combustibilidad del oxigeno. -Compression cylinders generate static electricity and EDM in their operation, from which a danger of explosions derives and generates premature breakage due to the aging of the materials, due to the combustibility of oxygen.
-La compresión se realiza de una manera constante, pudiendo haber desfases entre la compresión y el suministro de la alimentación del gas, cuando esta alimentación varia. -The compression is performed in a constant manner, and there may be gaps between the compression and the supply of the gas supply, when this supply varies.
-Los cilindros de compresión requieren una refrigeración para evitar sobrecalentamientos peligrosos, incluyéndose un sistema de refrigeración en las culatas y camisas de los propios cilindros, lo cual plantea dificultades importantes para el mantenimiento, ya que para cualquier operación en el sistema de refrigeración se requiere el desmontaje de los cilindros de compresión correspondientes. -Compression cylinders require refrigeration to avoid dangerous overheating, including a cooling system in the cylinder heads and sleeves of the cylinders themselves, which poses major maintenance difficulties, since for any operation in the refrigeration system the disassembly of the corresponding compression cylinders.
-En la compresión se producen turbulencias del gas, lo cual da lugar a alteraciones de los aparatos electrónicos de medida que van dispuestos en el equipo, resultando desvirtuadas las medidas que se obtienen. -In compression, gas turbulence occurs, which leads to alterations of the electronic measuring devices that are arranged in the equipment, resulting in distorted measures obtained.
Objeto de la invención Object of the invention
De acuerdo con la invención se propone un compresor que permite realizar en unas condiciones ventajosas la compresión de oxigeno para ser envasado, solucionando los inconvenientes de los aparatos convencionales de dicha función. In accordance with the invention, a compressor is proposed that allows oxygen compression to be packaged to be packaged under advantageous conditions, solving the drawbacks of conventional devices of said function.
Este compresor objeto de la invención consta de manera convencional de dos etapas de compresión conectadas en serie, comprendiendo cada una de dichas etapas un cilindro de compresión y un enfriador, con un motor rotativo o lineal de accionamiento que actúa el movimiento de los pistones de ambos cilindros, de forma que el oxigeno que se suministra para ser comprimido pasa por la primera etapa de compresión, en donde se produce una precompresión y un enfriamiento, y luego pasa por la segunda etapa de compresión, en donde se produce una compresión más intensa y otro enfriamiento. This compressor object of the invention conventionally consists of two compression stages connected in series, each of said stages comprising a compression cylinder and a cooler, with a Rotary or linear drive motor that acts on the movement of the pistons of both cylinders, so that the oxygen that is supplied to be compressed passes through the first compression stage, where precompression and cooling occurs, and then goes through the second stage of compression, where there is more intense compression and other cooling.
En ese conjunto funcional, según la invención, los cilindros de las etapas de compresión se disponen conectados eléctricamente a tierra, con lo cual la electricidad estática y electroerosión que genera el funcionamiento, por el rozamiento de dichos cilindros de compresión, se descarga sin que quede acumulada, evitándose asi el peligro de explosiones y roturas de ejes y vástagos. In that functional set, according to the invention, the cylinders of the compression stages are arranged electrically grounded, whereby the static electricity and EDM generated by the operation, by friction of said compression cylinders, is discharged without remaining accumulated, and consequently the risk of explosions and broken shafts and rods.
Según una realización, el accionamiento de los cilindros de compresión se establece mediante un motor- reductor, en relación con el cual se dispone un variador de frecuencia, el cual en combinación con un sensor de presión ajusta el funcionamiento de la compresión de acuerdo con el suministro del oxigeno en cada instante, evitando asi desfases entre la alimentación del oxigeno y la compresión. No obstante, mediante un grupo hidráulico y un cilindro de accionamiento con movimiento lineal colocado en el centro de los dos cilindros de compresión, el equipo puede funcionar del mismo modo. According to one embodiment, the actuation of the compression cylinders is established by a motor-reducer, in relation to which a frequency inverter is arranged, which in combination with a pressure sensor adjusts the operation of the compression according to the supply of oxygen in each moment, thus avoiding gaps between the supply of oxygen and compression. However, by means of a hydraulic group and a drive cylinder with linear movement placed in the center of the two compression cylinders, the equipment can operate in the same way.
En los pistones de los cilindros de compresión se disponen además unos segmentos guias anulares de rozamiento sobre la pared interna de los cilindros, con lo cual se evitan las turbulencias del oxigeno que se comprime, de manera que las medidas que proporcionan los aparatos electrónicos son más exactas, lográndose un funcionamiento del compresor más eficiente. In the pistons of the compression cylinders there are also some annular guide friction segments on the inner wall of the cylinders, thereby avoiding the turbulence of the oxygen that is compressed, so that the measures that provide electronic devices are more accurate, achieving a more efficient operation of the compressor.
Y en las etapas de compresión, las culatas de los pistones de los cilindros van provistas con un circuito de liquido refrigerante y doble camisa, de forma que el oxigeno sale a baja temperatura y se alarga la vida útil del compresor, resultando además más sencillas las operaciones de mantenimiento en dichos enfriadores y en los cilindros. And in the compression stages, the cylinder heads of the cylinders are provided with a circuit of coolant and double jacket, so that the oxygen comes out at a low temperature and lengthens the life of the compressor, making it easier to maintenance operations on said chillers and cylinders.
Por todo ello, dicho compresor objeto de la invención resulta de unas características muy ventajosas para la función a la que está destinado, adquiriendo vida propia y carácter preferente respecto de los compresores convencionales de la misma aplicación. Therefore, said compressor object of the invention results in very advantageous characteristics for the function to which it is intended, acquiring its own life and preferential character with respect to conventional compressors of the same application.
Descripción de las figuras Description of the figures
La figura 1 muestra un esquema del conjunto funcional del compresor objeto de la invención, con accionamiento de los cilindros de compresión mediante un motor-reductor. Figure 1 shows a diagram of the functional assembly of the compressor object of the invention, with actuation of the compression cylinders by a motor-reducer.
La figura 2 es una perspectiva del compresor según un ejemplo de realización. Figure 2 is a perspective of the compressor according to an exemplary embodiment.
La figura 3 es una perspectiva ampliada de una etapa de compresión del compresor preconizado. Figure 3 is an enlarged perspective of a compression stage of the recommended compressor.
La figura 4 es una vista en sección de la etapa de compresión anterior. Figure 4 is a sectional view of the previous compression stage.
La figura 5 es una sección ampliada del cilindro de la etapa de compresión. Figure 5 is an enlarged section of the cylinder of the compression stage.
La figura 6 es una vista del conjunto del compresor con las conexiones a tierra de los cilindros de compresión y de las partes relacionadas con ellos. Figure 6 is a view of the compressor assembly with the ground connections of the compression cylinders and the parts related thereto.
Descripción detallada de la invención Detailed description of the invention
El objeto de la invención se refiere a un compresor para comprimir el oxigeno destinado a envasarse en recipientes de consumo, comprendiendo dos etapas de compresión formadas por sendos cilindros (1 y 2), los cuales son actuados por un mismo actuador (3) de accionamiento, para realizar, mediante el cilindro (1) de la primera etapa una precompresión y con el cilindro (2) de la segunda etapa un complemento de compresión hasta la presión de envasado. The object of the invention relates to a compressor for compressing the oxygen intended to be packaged in consumer containers, comprising two compression stages formed by two cylinders (1 and 2), which are operated by the same actuator (3). , to perform, by means of the cylinder (1) of the first stage a precompression and with the cylinder (2) of the second stage a compression complement up to the packing pressure.
Las etapas de compresión comprenden a su vez sendos enfriadores (4 y 5) , los cuales van dispuestos exteriormente respecto de los respectivos cilindros (1 y 2), de manera que el oxigeno a comprimir entra en el primer cilindro (1) y a la salida del mismo pasa por el enfriador (4) correspondiente, introduciéndose luego en el segundo cilindro (2) y a la salida de éste pasa por el respectivo enfriador (5), desde donde se dirige al envasado, como se observa en la figura 1. The compression stages in turn comprise two coolers (4 and 5), which are arranged externally with respect to the respective cylinders (1 and 2), so that the oxygen to be compressed enters the first cylinder (1) and at the outlet It passes through the corresponding cooler (4), then entering the second cylinder (2) and at the outlet of the latter passes through the respective cooler (5), from where it is directed to the packaging, as shown in Figure 1.
Según una realización (figura 1), el accionamiento de los cilindros (1 y 2) de compresión se realiza mediante un actuador (3) formado por un motorreductor , en relación con el cual se dispone un variador de frecuencia (no representado) , y en relación con el mismo un sensor de presión que mide la presión del oxigeno que se suministra para ser comprimido, de forma que, en función de la alimentación (6) del oxigeno en cada instante, el variador de frecuencia ajusta el accionamiento de los cilindros (1 y 2), evitando que se produzcan desfases entre dicha alimentación (6) del oxigeno y la compresión. Aunque dichas máquinas también pueden trabajar a un número fijo de revoluciones por minuto, sin necesidad de usar un variador. According to one embodiment (Figure 1), the actuation of the compression cylinders (1 and 2) is carried out by means of an actuator (3) formed by a gearmotor, in relation to which a frequency inverter (not shown) is arranged, and in relation thereto a pressure sensor that measures the oxygen pressure that is supplied to be compressed, so that, depending on the supply (6) of the oxygen at each moment, the frequency inverter adjusts the actuation of the cylinders (1 and 2), preventing the occurrence of mismatches between said oxygen supply (6) and compression. Although these machines can also work at a fixed number of revolutions per minute, without using a drive.
No obstante, dicho accionamiento de los cilindros (1 y 2) puede realizarse igualmente mediante un actuador (3) formado por un cilindro hidráulico con movimiento lineal, colocado entre los dos cilindros (1 y 2) . However, said actuation of the cylinders (1 and 2) can also be carried out by means of an actuator (3) formed by a hydraulic cylinder with linear movement, placed between the two cylinders (1 and 2).
En relación con los cilindros (1 y 2) y respecto de las estructuras relacionadas con los mismos, se disponen además conexiones a tierra mediante cables (7), como se observa en la figura 6, con lo cual la electricidad estática que generan dichos cilindros (1 y 2) en el funcionamiento se descarga a tierra, evitando asi acumulaciones de electricidad estática y electroerosión y con ello el peligro de explosiones por causa de las mismas. In relation to the cylinders (1 and 2) and with respect to the structures related thereto, ground connections are also provided by cables (7), as seen in Figure 6, whereby the static electricity generated by said cylinders (1 and 2) in operation it is discharged to ground, thus avoiding accumulations of static electricity and EDM and with it the danger of explosions due to them.
Por otro lado, en los pistones (8) de los cilindros (1 y 2) se dispone una junta especial de labio y muelle (9) para asegurar la hermeticidad con respecto a la camisa (10) correspondiente, unos segmentos guias (11) que rozan sobre la camisa (10), haciendo dichos segmentos guias (11) un efecto de guiado y centrado del pistón (8) , y una junta aro pistón (12) de hierro colado resistente al desgaste y con altas propiedades anticorrosivas. En el recorrido del pistón, éste va rozando con la camisa (10) y, al ser los dos metálicos y estar siempre en contacto, descarga la electricidad estática y electroerosión que con el roce del deslizamiento se puedan producir. Con estos elementos se evitan las turbulencias del oxigeno dentro de los mencionados cilindros (1 y 2) y con ello la influencia negativa de esas turbulencias en los aparatos electrónicos de medida que controlan el funcionamiento del compresor. On the other hand, in the pistons (8) of the cylinders (1 and 2) there is a special lip and spring seal (9) to ensure airtightness with respect to the corresponding jacket (10), guide segments (11) rubbing on the jacket (10), said guide segments (11) making a guiding and centering effect of the piston (8), and a piston ring gasket (12) made of wear-resistant cast iron with high anti-corrosive properties. In the course of the piston, this one is rubbing with the jacket (10) and, being the two metallic ones and always being in contact, discharge static electricity and EDM that can occur with the friction of the slip. With these elements, the turbulence of oxygen within the aforementioned cylinders (1 and 2) is avoided and with it the negative influence of these turbulence on the electronic measuring devices that control the operation of the compressor.
Aunque toda la explicación del compresor preconizado se ha hecho con referencia a la compresión de oxigeno, por ser ésta su aplicación principal, el sistema puede ser utilizado de igual modo para comprimir otros gases, como helio, nitrógeno, etc. Although all the explanation of the recommended compressor has been made with reference to oxygen compression, since this is its main application, the system can be used in the same way to compress other gases, such as helium, nitrogen, etc.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES201100190A ES2368406B1 (en) | 2011-02-22 | 2011-02-22 | OXYGEN COMPRESSOR. |
| ESP2011000190 | 2011-02-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012113946A1 true WO2012113946A1 (en) | 2012-08-30 |
Family
ID=44863398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/ES2012/000037 Ceased WO2012113946A1 (en) | 2011-02-22 | 2012-02-21 | Oxygen compressor |
Country Status (2)
| Country | Link |
|---|---|
| ES (1) | ES2368406B1 (en) |
| WO (1) | WO2012113946A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2999105A1 (en) * | 2023-08-24 | 2025-02-24 | Ceimsa Electromedicina S L | ELECTROHYDRAULIC COMPRESSOR FOR VOLATILE GASES (Machine-translation by Google Translate, not legally binding) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB276612A (en) * | 1926-08-30 | 1928-02-02 | Tech D Etudes Et D Entpr S Pou | Improved process of and apparatus for the cooling of piston compressors |
| US2765976A (en) * | 1952-03-14 | 1956-10-09 | Pennsylvania Pump & Compressor | Two stage compressor |
| US4111609A (en) * | 1975-10-22 | 1978-09-05 | Anton Braun | Multistage gas compressor |
| US4627795A (en) * | 1982-03-30 | 1986-12-09 | Linde Aktiengesellschaft | Piston assembly for a compressor or the like |
| US20030094097A1 (en) * | 2001-11-16 | 2003-05-22 | Karl-Wilhelm Herwig | Piston and cylinder unit including a housing, a piston and a piston rod |
| US20040113336A1 (en) * | 2001-11-12 | 2004-06-17 | Leif Lundahl | Device at an energy accumulating piston-cylinder tool |
| US20090038472A1 (en) * | 2007-08-10 | 2009-02-12 | Hyco Pacoma Gmbh | Piston and Cylinder Unit |
-
2011
- 2011-02-22 ES ES201100190A patent/ES2368406B1/en active Active
-
2012
- 2012-02-21 WO PCT/ES2012/000037 patent/WO2012113946A1/en not_active Ceased
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB276612A (en) * | 1926-08-30 | 1928-02-02 | Tech D Etudes Et D Entpr S Pou | Improved process of and apparatus for the cooling of piston compressors |
| US2765976A (en) * | 1952-03-14 | 1956-10-09 | Pennsylvania Pump & Compressor | Two stage compressor |
| US4111609A (en) * | 1975-10-22 | 1978-09-05 | Anton Braun | Multistage gas compressor |
| US4627795A (en) * | 1982-03-30 | 1986-12-09 | Linde Aktiengesellschaft | Piston assembly for a compressor or the like |
| US20040113336A1 (en) * | 2001-11-12 | 2004-06-17 | Leif Lundahl | Device at an energy accumulating piston-cylinder tool |
| US20030094097A1 (en) * | 2001-11-16 | 2003-05-22 | Karl-Wilhelm Herwig | Piston and cylinder unit including a housing, a piston and a piston rod |
| US20090038472A1 (en) * | 2007-08-10 | 2009-02-12 | Hyco Pacoma Gmbh | Piston and Cylinder Unit |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2368406B1 (en) | 2012-09-07 |
| ES2368406A1 (en) | 2011-11-17 |
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