A biomass fuel feeding system suitable for a variety of biomass fuels

Abstract

The utility model provides a kind of be applicable to a variety of biomass fuel feeding system, including reduction motor, conveying main cylinder, feed interface, main shaft, helical blade, the output end of the reduction motor is fixedly connected with main shaft, the front end of the reduction motor is fixedly connected with conveying main cylinder, the top of the conveying main cylinder is fixedly connected with feed interface;The top end of the feed interface is square mouth, the outer surface of the main shaft is fixedly connected with helical blade.The utility model has the advantages that: it has excellent material adaptability: it can efficiently handle high moisture content, various forms, poor flowability fluffy biomass fuel (such as garden waste, straw, wood chips, etc.), greatly broaden the source of biomass raw materials, reduce production cost.The system fundamentally solves the problem of blockage: through the physical way of "pre-compression + strong push", the possibility of bridging and blocking of materials in the feeding system is eliminated from mechanism, the continuity of production is guaranteed, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of biomass furnace technology, and in particular to a feeding system suitable for various biomass fuels. Background Technology

[0002] Urban landscaping waste (such as dead branches and fallen leaves) is used as the core feedstock for biomass gasification furnaces. This approach not only effectively solves the problem of urban green waste disposal, turning waste into treasure, but also achieves significant ecological and economic benefits.

[0003] However, this raw material route also presents unique technical challenges. Although the morphology of these landscaping wastes meets the feeding requirements after preliminary crushing, their natural moisture content is extremely high (typically 40%–60% or even higher), and their texture is loose and lacks fluidity. When these materials are transported through a traditional screw feed system, they are prone to adhesion, bridging, and blockage at the inlet and feeding chamber. The material cannot enter the high-temperature gasifier uniformly and stably, directly leading to an imbalance in the pyrolysis and gasification process within the furnace. This manifests as fluctuations in gas production, decreased syngas quality (unstable calorific value), and drastic fluctuations in furnace temperature, severely restricting the continuous, stable, and efficient operation of the gasification system and increasing the operational burden and safety risks associated with manual unblocking. Therefore, a feeding system suitable for various biomass fuels is proposed to address these problems. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0005] Therefore, one objective of this utility model is to propose a feeding system suitable for various biomass fuels, in order to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0006] To achieve the above objectives, one embodiment of the present invention provides a feeding system suitable for various biomass fuels, including a geared motor, a conveying main cylinder, a feeding interface, a main shaft, and spiral blades. The output end of the geared motor is fixedly connected to the main shaft, the front end of the geared motor is fixedly connected to the conveying main cylinder, and the top of the conveying main cylinder is fixedly connected to the feeding interface. The top port of the feed interface is square, and a spiral blade is fixedly connected to the outer surface of the main shaft; The main shaft and spiral blades are located inside the main conveying cylinder; A pre-compression chamber is fixedly connected to the front end of the main conveying cylinder, and the pre-compression chamber is conical in shape. The port of the pre-compression chamber is fixedly connected to the push chamber, and the end of the push chamber is fixedly connected to a port for docking with the gasifier. A hydraulic mechanism is fixedly connected to the side of the chamber to be pushed, and a high-speed piston is fixedly connected to the output end of the hydraulic mechanism. The front end of the upper half of the push chamber is fixedly connected to a first track, and the rear end of the push chamber is fixedly connected to a second track. An upper gate is movably connected inside the first track, and a lower gate is movably connected inside the second track. A hydraulic cylinder is fixedly connected to the top of the second track, and the end of the output end of the hydraulic cylinder is fixedly connected to the top surface of the corresponding upper and lower gate plates.

[0007] Preferably, in any of the above embodiments, the geared motor is connected to the main shaft via a coupling, and the conveying main cylinder is made of stainless steel.

[0008] The above technical solution employs a three-stage collaborative working mechanism: screw pre-compression, piston powerful pushing, and double-gate sealing. This system abandons the traditional, simple mode that relies solely on screw conveying, and creatively adopts a three-stage collaborative working mechanism of "screw pre-compression + piston powerful pushing + double-gate sealing," integrating mechanical engineering, fluid mechanics, and automatic control technologies. It aims to achieve stable, sealed, and efficient conveying of biomass fuels with high moisture content and a tendency to become fluffy.

[0009] Preferably, in any of the above schemes, the conveying main cylinder is welded to the feeding interface, and the inner diameter of the pre-compression chamber gradually decreases from the input port to the output port.

[0010] Preferably, in any of the above embodiments, the pre-compression chamber is connected to the push chamber via a flange, and the high-speed piston can enter the lower part of the push chamber.

[0011] The screw conveyor and pre-compression module, located at the front of the system, is connected to the raw material silo outlet via a feed inlet. Its core component is a specially designed screw feeder. Unlike conventional screws, the screw discharge end of this system is not straight-through, but connected to a gradually narrowing conical "pre-compression chamber." When loose materials with high moisture content are conveyed forward by the screw blades, they are forced into this chamber with its gradually decreasing cross-sectional area.

[0012] During this process, the material is subjected to tremendous mechanical compression, effectively expelling internal air and some free moisture, resulting in a significant reduction in volume and a substantial increase in density. This pre-compression process transforms the originally loose, easily bridging material into a relatively dense and stable "fuel block," preparing it for subsequent pushing and fundamentally eliminating the material conditions that could cause blockage at the feed inlet.

[0013] The hydraulic piston powerful pushing module: After the pre-compressed fuel block is discharged from the conical cavity outlet, it does not directly enter the furnace, but falls into the pushing chamber of a reciprocating piston pusher driven by a hydraulic mechanism. Upon receiving a pushing command, the system instantly applies a huge thrust, driving the piston to move in a high-speed linear motion. With its powerful kinetic energy, it propels the fuel block into the gasifier furnace with extremely high speed and force, like launching a "cannonball".

[0014] This impact-feeding method has three major advantages: great inertia: overcoming the backflow force caused by the positive pressure in the furnace; deep into the furnace: ensuring that the fuel is delivered to the core area of ​​the gasification reaction, rather than accumulating at the inlet; and thorough blockage: its powerful kinetic energy is sufficient to disperse any weak material accumulation that may form at the inlet, thus completely preventing blockage.

[0015] The dual-gate linkage sealing module is a key design feature ensuring the safety of the entire gasifier system. A dual-gate sealing valve is installed. The two gates, one moving up and one down, alternately open and close through precise program control. Their working cycle is strictly linked to the piston pushing action: In the first stage, during the feed preparation period, the upper gate is open and the lower gate is closed. The piston pusher retracts, and the fuel block formed in the pre-compression chamber falls into the chamber to be pushed. At this time, the lower gate acts as an absolute safety barrier, completely isolating the furnace from the external environment.

[0016] Step Two: The Powerful Pushing Phase. At this point, the upper gate closes rapidly, sealing the upper feed channel; almost simultaneously, the lower gate opens quickly, making way for the fuel blocks. The piston advances instantly, pushing the fuel blocks into the furnace at high speed.

[0017] During the reset sealing period, the piston retracts, the lower gate immediately closes, and the furnace is resealed. The upper gate then reopens to receive the next fuel block, beginning the next cycle.

[0018] Throughout this process, one gate remains tightly closed, forming a dynamic and absolutely reliable mechanical seal. This design perfectly solves the leakage problems that may exist when traditional single gates or star feeders are used to seal positive pressure furnaces, completely eliminating the reverse overflow of high-temperature flue gas and leaked combustible gases, ensuring extremely high safety.

[0019] Preferably, of any of the above solutions, the hydraulic mechanism is installed horizontally, and the first and second tracks are installed vertically.

[0020] Preferably, in any of the above schemes, the upper gate controls whether the pre-compression chamber is connected to the push chamber, and the lower gate controls whether the push chamber is connected to the port.

[0021] The improvements of this system are as follows: Excellent material adaptability: It can efficiently process loose biomass fuels with high moisture content, diverse forms, and poor flowability (such as garden waste, straw, and wood chips), greatly expanding the sources of biomass raw materials and reducing production costs. Fundamentally solving the clogging problem: Through a physical method of "pre-compression + powerful pushing," the possibility of material bridging and clogging within the feeding system is eliminated from the mechanism, ensuring continuous production and reducing maintenance costs.

[0022] Extremely high system safety and sealing: The interlocking design of the dual gate valves forms an impenetrable safety barrier, ensuring stable operating conditions within the high-pressure gasifier and eliminating any risk of backfire, providing a cornerstone for the safe operation of the entire system. Optimized combustion and improved efficiency: The deep insertion depth of the fuel blocks allows for full and rapid contact with the high-temperature reaction layer, improving gasification efficiency and syngas quality, reducing tar production, and also contributing to stable furnace temperature, ultimately enhancing the energy conversion efficiency and economic benefits of the entire system.

[0023] This system features an ingenious structural design, high reliability, and a combination of innovation and practicality. It provides a highly efficient, safe, and reliable solution to the industry challenges of feeding high-moisture-content biomass raw materials, and has extremely broad market application prospects.

[0024] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows: This system is applicable to various biomass fuel feeding systems and boasts excellent material adaptability: it can efficiently process loose biomass fuels with high moisture content, diverse forms, and poor flowability (such as garden waste, straw, and wood chips), greatly expanding the sources of biomass raw materials and reducing production costs. This system fundamentally solves the clogging problem: through a physical method of "pre-compression + powerful pushing," it eliminates the possibility of material bridging and clogging within the feeding system, ensuring continuous production and reducing maintenance costs.

[0025] This system boasts extremely high system safety and sealing: the interlocking design of the dual gate valves forms an impenetrable safety barrier, ensuring stable operating conditions within the high-pressure gasifier and eliminating any risk of backfire, thus providing a cornerstone for the safe operation of the entire system. Optimized combustion and improved efficiency: The deep insertion depth of the fuel blocks allows for full and rapid contact with the high-temperature reaction layer, improving gasification efficiency and syngas quality, reducing tar production, and also contributing to stable furnace temperature, ultimately enhancing the overall system's energy conversion efficiency and economic benefits.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a first-view structural schematic diagram of the present invention; Figure 2 This is a structural schematic diagram of the present invention from a second perspective; Figure 3 This is a structural schematic diagram of the present invention from a third-view perspective; Figure 4 This is a partial structural diagram of the interior of the push chamber of this utility model.

[0028] In the diagram: 1-gear motor, 2-main conveyor cylinder, 3-feeding interface, 4-main shaft, 5-spiral blade, 6-pre-compression chamber, 7-push chamber, 8-port, 9-hydraulic mechanism, 10-high-speed piston, 11-first track, 12-second track, 13-upper gate, 14-lower gate, 15-hydraulic cylinder. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] like Figure 1-4 As shown, this is applicable to various biomass fuel feeding systems, including a geared motor 1, a conveying main cylinder 2, a feeding interface 3, a main shaft 4, and a spiral blade 5. The output end of the geared motor 1 is fixedly connected to the main shaft 4, the front end of the geared motor 1 is fixedly connected to the conveying main cylinder 2, and the top of the conveying main cylinder 2 is fixedly connected to the feeding interface 3. The top port of the feed interface 3 is square, and the outer surface of the main shaft 4 is fixedly connected with a spiral blade 5; The main shaft 4 and the spiral blade 5 are located inside the main conveying cylinder 2; A pre-compression chamber 6 is fixedly connected to the front end of the main conveying cylinder 2. The pre-compression chamber 6 is conical in shape. The port of the pre-compression chamber 6 is fixedly connected to the push chamber 7, and the end of the push chamber 7 is fixedly connected to a port 8 to connect to the gasifier. A hydraulic mechanism 9 is fixedly connected to the side of the push chamber 7, and a high-speed piston 10 is fixedly connected to the output end of the hydraulic mechanism 9. The front end of the upper half of the push chamber 7 is fixedly connected to the first track 11, and the rear end of the push chamber 7 is fixedly connected to the second track 12. The upper gate 13 is movably connected inside the first track 11, and the lower gate 14 is movably connected inside the second track 12. A hydraulic cylinder 15 is fixedly connected to the top of the second track 12, and the end of the output end of the hydraulic cylinder 15 is fixedly connected to the top surface of the corresponding upper gate 13 and lower gate 14.

[0032] Example 1: The geared motor 1 is connected to the main shaft 4 via a coupling. The conveying main cylinder 2 is made of stainless steel. The conveying main cylinder 2 is welded to the feed interface 3. The inner diameter of the pre-compression chamber 6 gradually decreases from the input port to the output port. The pre-compression chamber 6 is connected to the push chamber 7 via a flange. The high-speed piston 10 can enter the lower part of the push chamber 7. The hydraulic mechanism 9 is installed horizontally, and the first track 11 and the second track 12 are installed vertically. The upper gate 13 controls whether the pre-compression chamber 6 is connected to the push chamber 7, and the lower gate 13 controls whether the push chamber 7 is connected to the port 8.

[0033] Example 2: This system includes a three-stage collaborative working mechanism: screw pre-compression, piston powerful push, and double gate sealing. This system abandons the traditional, simple mode that relies solely on screw conveying, and creatively adopts a three-stage collaborative working mechanism of "screw pre-compression + piston powerful push + double gate sealing," integrating mechanical engineering, fluid mechanics, and automatic control technologies. It aims to achieve stable, sealed, and efficient conveying of biomass fuel with high moisture content and loose texture.

[0034] The screw conveyor and pre-compression module is located at the front of the system and is connected to the raw material silo outlet via feed interface 3. Its core component is a specially designed screw feeder. Unlike conventional screws, the screw discharge end of this system is not straight but connected to a gradually narrowing conical "pre-compression chamber 6". When loose materials with high moisture content are conveyed forward by the screw blades 5, they are forced into this chamber with a gradually decreasing cross-sectional area.

[0035] During this process, the material is subjected to tremendous mechanical compression, effectively expelling internal air and some free moisture, resulting in a significant reduction in volume and a substantial increase in density. This pre-compression process transforms the originally loose, easily bridging material into a relatively dense and stable "fuel block," preparing it for subsequent pushing and fundamentally eliminating the material conditions that could cause blockage at the feed inlet.

[0036] The hydraulic piston powerful pushing module: After the pre-compressed fuel block is discharged from the conical cavity outlet, it does not directly enter the furnace, but falls into the pushing chamber 7 of a reciprocating piston pusher driven by a hydraulic mechanism 9. After receiving a pushing command, the system instantly applies a huge thrust, driving the piston to move in a high-speed linear motion. With its powerful kinetic energy, the fuel block is pushed into the gasifier furnace at extremely high speed and force, like a "cannonball".

[0037] This impact-feeding method has three major advantages: great inertia: overcoming the backflow force caused by the positive pressure in the furnace; deep into the furnace: ensuring that the fuel is delivered to the core area of ​​the gasification reaction, rather than accumulating at the inlet; and thorough blockage: its powerful kinetic energy is sufficient to disperse any weak material accumulation that may form at the inlet, thus completely preventing blockage.

[0038] The dual-gate linkage sealing module is a key design feature ensuring the safety of the entire gasifier system. A dual-gate sealing valve is installed. The two gates, one moving up and one down, alternately open and close through precise program control. Their working cycle is strictly linked to the piston pushing action: In the first stage, during the feed preparation period, the upper gate 13 is open and the lower gate 14 is closed. The piston pusher retracts, and the fuel block formed in the pre-compression chamber 6 falls into the chamber of the push-out compartment 7. At this time, the lower gate 14 acts as an absolute safety barrier, completely isolating the furnace from the external environment.

[0039] Step Two: The Powerful Pushing Phase. At this time, the upper gate 13 quickly closes, sealing the upper feed channel; almost simultaneously, the lower gate 14 rapidly opens, making way for the fuel block. The piston advances instantly, pushing the fuel block into the furnace at high speed.

[0040] During the reset sealing period, the piston retracts, and the lower gate 14 immediately closes, resealing the furnace. The upper gate 13 then reopens, ready to receive the next fuel block and begin the next cycle.

[0041] Throughout this process, one gate remains tightly closed, forming a dynamic and absolutely reliable mechanical seal. This design perfectly solves the leakage problems that may exist when traditional single gates or star feeders are used to seal positive pressure furnaces, completely eliminating the reverse overflow of high-temperature flue gas and leaked combustible gases, ensuring extremely high safety.

[0042] The working principle of this utility model is as follows: After the system starts, the geared motor 1 begins to run, driving the main shaft 4 to rotate via the coupling. The spiral blades 5 on the main shaft 4 rotate accordingly. Biomass fuel (such as garden waste, straw, wood chips, etc.) enters the main conveying cylinder 2 from the raw material bin outlet through the feed inlet 3 (the feed inlet 3 is welded to the main conveying cylinder 2). As the spiral blades 5 rotate, the fuel is conveyed forward. Since the front end of the main conveying cylinder 2 is connected to the pre-compression chamber 6, and the inner diameter of the pre-compression chamber 6 gradually decreases from the inlet to the outlet, when the loose material with a high moisture content is conveyed forward by the spiral blades 5 to the pre-compression chamber 6, it will be forced into this cavity with a gradually decreasing cross-sectional area. During this process, the material is subjected to huge mechanical compression force, and the air and some free moisture inside are effectively discharged. The volume of the material is greatly reduced, and the density is significantly increased. The originally loose and easily bridging material is transformed into a relatively dense and stable "fuel block", preparing for subsequent pushing.

[0043] After being pre-compressed, the fuel blocks are discharged from the outlet of the pre-compression chamber 6 (which is connected to the push chamber 7 via a flange) and fall into the push chamber 7. At this time, the system is in the feeding preparation period. The upper gate 13 is open, the lower gate 14 is closed, the piston pusher retracts, and the fuel blocks formed in the pre-compression chamber 6 fall into the chamber of the push chamber 7. The lower gate 14 acts as a safety barrier, completely isolating the furnace from the external environment. When the system receives the push command, the hydraulic mechanism 9 (horizontally installed) instantly applies a huge thrust, driving the high-speed piston 10 (which can enter the lower part of the push chamber 7) to move in a high-speed linear motion. The high-speed piston 10, with its powerful kinetic energy, propels the fuel blocks into the gasifier furnace at extremely high speed and force, like launching a "cannonball". This impact-type feeding method has great inertia, which can overcome the back-blowing force brought about by the positive pressure in the furnace; it can ensure that the fuel is delivered to the core area of ​​the gasification reaction, rather than accumulating at the inlet; its powerful kinetic energy is enough to disperse any weak material accumulation that may form at the inlet, completely preventing blockage.

[0044] The dual-gate linkage sealing module is a key design feature ensuring the safety of the entire gasifier system. During the strong push phase, the upper gate 13 quickly closes, sealing the upper feed channel (i.e., the connection between the pre-compression chamber 6 and the push chamber 7; the upper gate 13 controls whether the pre-compression chamber 6 and the push chamber 7 are connected); almost simultaneously, the lower gate 14 quickly opens, making way for the fuel block, and the high-speed piston 10 pushes the fuel block into the furnace at high speed. After entering the reset sealing phase, the high-speed piston 10 retracts, and the lower gate 14 immediately closes, resealing the furnace (the lower gate 14 controls whether the push chamber 7 and port 8 are connected). Subsequently, the upper gate 13 reopens, ready to receive the next fuel block, starting the next cycle. Throughout this process, one gate remains tightly closed. The first track 11 and the second track 12 (vertically installed) guide the movement of the upper gate 13 and the lower gate 14, respectively. The hydraulic cylinder 15 (fixedly connected to the top of the second track 12, with its output end fixedly connected to the top surface of the corresponding upper gate 13 and lower gate 14) provides power for the gate's movement, forming a dynamic and absolutely reliable mechanical seal. This design perfectly solves the leakage problems that may exist in traditional single-gate or star-shaped feeders when sealing a positive-pressure furnace, completely eliminating the reverse overflow of high-temperature flue gas and leaked combustible gases, ensuring stable operating conditions within the high-pressure gasifier, eliminating any risk of backfire, and providing a guarantee for the safe operation of the entire system.

[0045] Through the coordinated work of the above three stages, this feeding system achieves stable, sealed, and efficient transportation of biomass fuel with high moisture content and loose texture, optimizes the combustion process, and improves the system's energy conversion efficiency and economic benefits.

[0046] Compared with the prior art, the present invention has the following advantages: This system is applicable to various biomass fuel feeding systems and boasts excellent material adaptability: it can efficiently process loose biomass fuels with high moisture content, diverse forms, and poor flowability (such as garden waste, straw, and wood chips), greatly expanding the sources of biomass raw materials and reducing production costs. This system fundamentally solves the clogging problem: through a physical method of "pre-compression + powerful pushing," it eliminates the possibility of material bridging and clogging within the feeding system, ensuring continuous production and reducing maintenance costs.

[0047] This system boasts extremely high system safety and sealing: the interlocking design of the dual gate valves forms an impenetrable safety barrier, ensuring stable operating conditions within the high-pressure gasifier and eliminating any risk of backfire, thus providing a cornerstone for the safe operation of the entire system. Optimized combustion and improved efficiency: The deep insertion depth of the fuel blocks allows for full and rapid contact with the high-temperature reaction layer, improving gasification efficiency and syngas quality, reducing tar production, and also contributing to stable furnace temperature, ultimately enhancing the overall system's energy conversion efficiency and economic benefits.

Claims

1. A feeding system suitable for various biomass fuels, characterized in that, It includes a geared motor (1), a conveying main cylinder (2), a feeding interface (3), a main shaft (4), and a spiral blade (5). The output end of the geared motor (1) is fixedly connected to the main shaft (4), the front end of the geared motor (1) is fixedly connected to the conveying main cylinder (2), and the top of the conveying main cylinder (2) is fixedly connected to the feeding interface (3). The top port of the feed interface (3) is square, and the outer surface of the main shaft (4) is fixedly connected with a spiral blade (5). The main shaft (4) and the spiral blades (5) are located inside the main conveying cylinder (2); The front end of the main conveying cylinder (2) is fixedly connected to a pre-compression chamber (6), which is conical in shape. The port of the pre-compression chamber (6) is fixedly connected to the push chamber (7), and the end of the push chamber (7) is fixedly connected to a port (8) to connect to the gasifier. A hydraulic mechanism (9) is fixedly connected to the side of the push chamber (7), and a high-speed piston (10) is fixedly connected to the output end of the hydraulic mechanism (9). The front end of the upper half of the push chamber (7) is fixedly connected to a first track (11), and the rear end of the push chamber (7) is fixedly connected to a second track (12). The first track (11) is movably connected to an upper gate (13), and the second track (12) is movably connected to a lower gate (14). A hydraulic cylinder (15) is fixedly connected to the top of the second track (12), and the end of the output end of the hydraulic cylinder (15) is fixedly connected to the top surface of the corresponding upper gate (13) and lower gate (14).

2. The biomass fuel feeding system as described in claim 1, characterized in that: The geared motor (1) is connected to the main shaft (4) via a coupling, and the conveying main cylinder (2) is made of stainless steel.

3. A biomass fuel feeding system as described in claim 2, characterized in that: The conveying main cylinder (2) is welded to the feeding interface (3), and the inner diameter of the pre-compression chamber (6) gradually decreases from the input port to the output port.

4. A biomass fuel feeding system as described in claim 3, characterized in that: The pre-compression chamber (6) is connected to the push chamber (7) via a flange, and the high-speed piston (10) can enter the lower part of the push chamber (7).

5. A biomass fuel feeding system as described in claim 4, characterized in that: The hydraulic mechanism (9) is installed horizontally, and the first track (11) and the second track (12) are installed vertically.

6. A biomass fuel feeding system as described in claim 5, characterized in that: The upper gate (13) controls the connection between the pre-compression chamber (6) and the push chamber (7), and the lower gate (14) controls the connection between the push chamber (7) and the port (8).

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