Gas pressure reduction system for coffee machine

Abstract

The invention discloses a gas pressure reduction system for a coffee machine, the gas pressure reduction system is matched with the coffee machine for use, the coffee machine comprises a main machine and a gas cylinder, the main machine comprises a water bin and a coffee extraction bin, the gas cylinder is communicated with the input end of the gas pressure reduction system, and the output end of the gas pressure reduction system is communicated to the water bin; the gas decompression system comprises a high-pressure pipeline, a gas decompression device and a low-pressure pipeline, the input end of the high-pressure pipeline is connected with the gas cylinder, the output end is connected with a high-pressure cavity of the gas decompression device, the low-pressure cavity of the gas decompression device is connected with the input end of the low-pressure pipeline, and the output end of the low-pressure pipeline is communicated to the water sump; the gas pressure reducing device comprises a valve seat, a valve rod, a gas inlet nozzle, a floating blocking mechanism and an adjusting knob; the floating blocking mechanism comprises a floating rod and an elastic piece; the elastic piece comprises at least one set of belleville springs. The invention provides the gas pressure reduction system with a brand new structure, and the gas pressure reduction system is used for realizing pressure reduction of the high-pressure gas output by the gas cylinder, so that the pressure required by coffee extraction is obtained, and the pressure value is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of daily necessities, and particularly relates to a gas pressure reducing system for a coffee machine. Background Art

[0002] At present, most of the Italian coffee machines on the market adopt the pump pressure type (high-pressure extraction). The principle is to actively apply pressure through an electric pump or a piston device to force hot water to quickly pass through the coffee powder layer. Representatives include semi-automatic / full-automatic Italian coffee machines and capsule coffee machines, etc. The above coffee machines have the disadvantages of large volume and high cost.

[0003] Some gas cylinder type coffee machines have emerged on the market. They have the advantage of small volume compared with traditional Italian coffee machines, and at the same time, they can provide the air pressure required for extraction and can extract the fragrance of coffee.

[0004] The gas source of the gas cylinder type coffee machine comes from a gas cylinder, and the gas stored in the gas cylinder is high-pressure gas, which needs to be depressurized before use. However, the gas pressure reducing system for coffee machines used in existing gas cylinder type coffee machines is generally set independently of the coffee machine, that is, the coffee machine is connected to the gas pressure reducing system for coffee machines involved in patents such as the patent No. CN204062068U and CN205654929U in an external connection manner. Therefore, although the coffee machine has a small volume, the overall coffee machine after connecting the external gas pressure reducing system for coffee machines has the disadvantages of large volume, unattractive appearance, and inability to integrate with the coffee machine. In addition, the pressure regulating knob of the existing coffee machine adopts a threaded connection method, which requires a lot of effort to rotate, and some even need to connect an extension handle externally to turn the pressure regulating knob to adjust the pressure. The prior art also has the defects of inconvenient pressure adjustment and laborious operation. Summary of the Invention

[0005] The purpose of the present invention is to provide a gas pressure reducing system for a coffee machine, which can at least solve one of the above problems.

[0006] According to one aspect of the present invention, there is provided a gas pressure reducing system for a coffee machine, which is used in cooperation with a coffee machine. The coffee machine includes a main body and a gas cylinder. The main body includes a water tank and a coffee extraction chamber. The gas cylinder is communicated with the input end of the gas pressure reducing system, and the output end of the gas pressure reducing system is communicated to the water tank. The gas pressure reducing system includes a high-pressure pipeline, a gas pressure reducing device, and a low-pressure pipeline. The input end of the high-pressure pipeline is connected to the gas cylinder, and the output end is connected to the high-pressure chamber of the gas pressure reducing device. The low-pressure chamber of the gas pressure reducing device is connected to the input end of the low-pressure pipeline, and the output end of the low-pressure pipeline is communicated to the water tank;

[0007] The gas pressure reducing device includes a valve seat, a valve stem, an air inlet nozzle, a floating plugging mechanism, and an adjusting knob. A high-pressure chamber and a low-pressure chamber are formed in the valve seat. The air inlet nozzle is installed in the valve seat and separates the high-pressure chamber from the low-pressure chamber. An air inlet passage is formed in the air inlet nozzle, and an air hole is provided at the end of the air inlet passage. The valve stem is installed in the valve seat. The floating plugging mechanism is installed at the first end of the valve stem and cooperates with the air outlet end of the air hole. The adjusting knob is installed at the second end of the valve stem and can drive the valve stem to rotate;

[0008] The floating plugging mechanism includes a floating rod and an elastic member. One end of the floating rod is movably sleeved on the valve stem, and the other end cooperates with the air hole. The elastic member is sleeved on the outer periphery of the floating rod, and both ends thereof are respectively abutted against the valve stem and the floating rod. Under the action of the elastic member, the floating rod always elastically contacts the air inlet nozzle;

[0009] The elastic member includes at least one set of disc springs;

[0010] Assume that the pressure value of the high-pressure gas output from the gas cylinder is P1, the pressure value of the low-pressure gas entering the low-pressure chamber from the high-pressure chamber is P0, and the pressure value for pressing the air inlet nozzle through the preset floating plugging mechanism is P2. Then P0 should satisfy: P0 ≤ P1 - P2.

[0011] In some embodiments, a limiting boss is formed at one end of the floating rod away from the valve stem. The limiting boss is movably installed in the low-pressure chamber and cooperates with the air hole. The first end of the elastic member abuts against the limiting boss.

[0012] In some embodiments, the gas pressure reducing device further includes a bearing. The bearing is installed at the end of the valve stem away from the adjusting knob and sleeved on the outer periphery of the floating rod. The two ends of the elastic member abut against the bearing.

[0013] In some embodiments, the floating plugging mechanism further includes a plugging piece. The plugging piece is installed at the center of the end face of the floating rod close to the air inlet nozzle and cooperates with the air hole.

[0014] In some embodiments, the valve stem is threadedly connected to the valve seat.

[0015] In some embodiments, a first threaded connection portion is provided on the outer wall of the valve stem, and a second threaded connection portion cooperating with the first threaded connection portion is provided on the inner wall of the valve seat.

[0016] In some embodiments, the air inlet nozzle is threadedly connected to the valve seat.

[0017] In some embodiments, a third threaded connection portion is provided on the outer wall of the air inlet nozzle, and a fourth threaded connection portion cooperating with the third thread is provided on the inner wall of the valve seat.

[0018] In some embodiments, the gas pressure reducing device further includes a sealing cover, which is installed on the end face of the valve seat away from the valve stem and is in sealing cooperation with the valve seat. The valve seat, the air inlet nozzle, and the sealing cover jointly enclose a high-pressure chamber.

[0019] In some embodiments, the gas pressure reducing system further includes a high-pressure sensor and a low-pressure sensor. The high-pressure sensor is cooperated with the high-pressure pipeline to detect the air pressure value of the high-pressure gas in the high-pressure pipeline, and the low-pressure sensor is cooperated with the low-pressure pipeline to detect the air pressure value of the low-pressure gas in the low-pressure pipeline.

[0020] Advantages of the present invention:

[0021] The present invention provides a gas pressure reducing system with a brand-new structure, which is used to reduce the pressure of the high-pressure gas output by the gas cylinder to obtain the pressure required for extracting coffee. The gas pressure reducing system is provided with a high-pressure pipeline, a gas pressure reducing device, and a low-pressure pipeline, which can not only reduce the pressure, but also form a complete gas path, effectively realizing the connection between the gas source and the gas-using components;

[0022] The gas pressure reducing device of the gas pressure reducing system adopts a floating plugging mechanism, which has a certain pressing force by itself. The high-pressure gas in the high-pressure chamber needs to overcome this pressing force before it can enter the low-pressure chamber. Thus, it can ensure that the gas entering the low-pressure chamber has a stable air pressure value, which ensures the stability of the extraction pressure required for subsequent coffee making;

[0023] The gas pressure reducing device adopts a disc spring as an elastic member. The disc spring has the advantages of short stroke, heavy load, small required space, easy maintenance and replacement, long service life, etc. Compared with the cylindrical helical compression spring used in traditional pressure reducing valves or pressure reducing structures, the elastic member formed by the combination of disc springs has a smaller requirement for the axial dimension, thereby reducing the overall volume of the pressure reducing device, and then can be effectively combined with the coffee machine, and can also achieve a large-scale pressure reducing effect;

[0024] The gas pressure reducing device is provided with a bearing, which adopts a miniature thrust ball flat bearing. Its function is to bear the axial load, and it has the advantages of high axial load and high stiffness. At the same time, its axial space occupation is small. More importantly, this bearing can realize the smooth operation of the adjustment knob, and the screwing process is smooth, greatly improving the user experience;

[0025] The gas pressure reducing system of the present invention can be effectively combined with the coffee machine. As a part of the coffee machine, it not only has a simple structure, but also has a beautiful appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. is a three-dimensional structure schematic diagram of applying the gas pressure reducing system of the present invention;

[0027] Figure 2 is Figure 1 a perspective structural schematic diagram of the coffee machine shown with some structures omitted;

[0028] Figure 3 is Figure 1 a perspective structural schematic diagram of the main body of the coffee machine shown;

[0029] Figure 4 is Figure 3 a top - view structural schematic diagram of the main body shown;

[0030] Figure 5 is Figure 4 a sectional structural schematic diagram of the main body shown in the B - B direction

[0031] Figure 6 a perspective structural schematic diagram of the overall pressure - reducing device of the present invention;

[0032] Figure 7 is Figure 6 a bottom - view structural schematic diagram of the pressure - reducing device shown;

[0033] Figure 8 is Figure 7 a sectional structural schematic diagram of the pressure - reducing device shown in the A - A direction;

[0034] Figure 9 an exploded structural schematic diagram of the pressure - reducing device of the present invention;

[0035] Figure 10 a perspective structural schematic diagram of the valve seat of the present invention.

[0036] Figures 1 to 10 Reference numerals in

[0037] a - main body; b - gas pressure - reducing system; c - gas cylinder; d - first housing; e - second housing; f - base; a1 - water tank; a2 - coffee extraction chamber; a3 - fixing seat; a4 - powder bowl; a5 - mounting seat; b1 - high - pressure pipeline; b2 - gas pressure - reducing device; b3 - low - pressure pipeline; b4 - high - pressure sensor; b5 - low - pressure sensor; b31 - intake pipe;

[0038] 1 - valve seat; 2 - valve stem; 3 - air inlet nozzle; 4 - floating plugging mechanism; 5 - adjusting knob; 6 - bearing; 7 - sealing cover; 11 - high - pressure chamber; 12 - low - pressure chamber; 13 - second threaded connection part; 14 - fourth threaded connection part; 15 - first connection hole; 16 - second connection hole; 21 - first threaded connection part; 22 - guide groove; 31 - intake channel; 32 - air hole; 33 - third threaded connection part; 41 - floating rod; 42 - elastic member; 43 - plugging piece; 421 - disc spring; 411 - limiting boss. Detailed Implementation Manner

[0039] The present invention will be further described in detail below with reference to the accompanying drawings.

[0040] Figures 1 to 10 Schematically shows a gas pressure reducing system for a coffee machine according to an embodiment of the present invention.

[0041] This gas pressure reducing system for a coffee machine is used in conjunction with the coffee machine.

[0042] As shown in Figures 1 to 5 , the coffee machine includes a main body a and a gas cylinder c. The main body a includes a water tank a1 and a coffee extraction chamber a2 connected by a one-way valve. The gas cylinder c is connected to the input end of the gas pressure reducing system b, and the output end of the gas pressure reducing system b is connected to the water tank a1. The gas pressure reducing system b includes a high-pressure pipeline b1, a gas pressure reducing device b2, and a low-pressure pipeline b3. The input end of the high-pressure pipeline b1 is connected to the gas cylinder c, and the output end is connected to the high-pressure chamber 11 of the gas pressure reducing device b2. The low-pressure chamber 12 of the gas pressure reducing device b2 is connected to the input end of the low-pressure pipeline b3, and the output end of the low-pressure pipeline b3 is connected to the water tank a1.

[0043] Preferably, the main body a of this embodiment further includes a fixing seat a3, a powder bowl a4, and a mounting seat a5. The fixing seat a3 is arranged at the bottom of the water tank a1. The mounting seat a5 is arranged at the bottom of the fixing seat a3 and is detachably connected to the fixing seat a3. The powder bowl a4 is used to hold coffee powder. The powder bowl a4 is sleeved in the mounting seat a5 and can be pressed by the mounting seat a5 against the bottom of the fixing seat a3. A coffee extraction chamber a2 is jointly formed between the powder bowl a4 and the fixing seat a3. An air inlet pipe b31 is installed on the fixing seat a3. The first end of the air inlet pipe b31 is connected to the output end of the low-pressure pipeline b3, and the second end penetrates through the water tank a1 and extends to the top position inside the water tank a1. Thus, the hot water in the water tank a1 will flow out from the bottom of the water tank a1 into the powder bowl a4, contact the coffee powder in the powder bowl a4 to obtain coffee liquid, and the coffee liquid flows out from the filter holes at the bottom of the powder bowl a4.

[0044] As shown in Figures 6 to 10 , the pressure reducing device of this embodiment includes a valve seat 1, a valve rod 2, an air inlet nozzle 3, a floating plugging mechanism 4, and an adjustment knob 5. A high-pressure chamber 11 and a low-pressure chamber 12 are formed inside the valve seat 1. The air inlet nozzle 3 is installed inside the valve seat 1 and separates the high-pressure chamber 11 and the low-pressure chamber 12. An air inlet channel 31 is opened in the air inlet nozzle 3, and a gas hole 32 is provided at the end of the air inlet channel 31. The valve rod 2 is sleeved on the valve seat 1. The floating plugging mechanism 4 is installed at the first end of the valve rod 2 and cooperates with the gas outlet end of the gas hole 32. The floating plugging mechanism 4 can always keep elastic contact with the air inlet nozzle 3. The adjustment knob is installed at the second end of the valve rod 2 and can drive the valve rod 2 to rotate.

[0045] Preferably, the floating plugging mechanism 4 includes a floating rod 41 and an elastic member 42. One end of the floating rod 41 is movably sleeved on the valve rod 2, and the other end is matched with the air hole 32. The elastic member 42 is sleeved on the outer periphery of the floating rod 41 and its two ends respectively abut against the valve rod 2 and the floating rod 41. Under the action of the elastic member 42, the floating rod 41 is always in elastic contact with the air inlet nozzle 3.

[0046] Preferably, a guiding groove 22 for limit cooperation with the floating rod 41 is formed at one end of the valve rod 2 away from the adjusting knob 5.

[0047] Preferably, the elastic member 42 includes at least one set of disc springs 421.

[0048] More preferably, there are two sets of disc springs 421 in this embodiment, and each set of disc springs 421 includes two disc spring pieces combined in an opposing manner.

[0049] Preferably, a limit boss 411 is formed at one end of the floating rod 41 away from the valve rod 2. The limit boss 411 is movably installed in the low-pressure chamber 12 and is matched with the air hole 32. The first end of the elastic member 42 abuts against the limit boss 411.

[0050] Preferably, the pressure reducing device further includes a bearing 6. The bearing 6 is installed at one end of the valve rod 2 away from the adjusting knob 5 and is sleeved on the outer periphery of the floating rod 41. The second end of the elastic member 42 abuts against the bearing 6.

[0051] More preferably, the bearing 6 is a commercially available miniature thrust ball plain bearing 6 with the model F4-8M. It can obtain a very high axial load and high stiffness in a very small space.

[0052] Preferably, the floating plugging mechanism 4 further includes a plugging piece 43. The plugging piece 43 is installed at the center of one end face of the floating rod 41 close to the air inlet nozzle 3 and is matched with the air hole 32.

[0053] More preferably, the plugging piece 43 is a tetrafluoro gasket. The fluorine gasket has good characteristics such as corrosion resistance, anti-aging and non-conductivity. It can have good mechanical strength between -100°C and 100°C. In this embodiment, the tetrafluoro gasket can achieve soft contact with the air inlet nozzle 3. It can not only avoid direct contact between the floating rod 41 and the air inlet nozzle 3, reduce friction and extend the service life, but also have good sealing performance after plugging to prevent air leakage and gas leakage.

[0054] Preferably, the valve rod 2 is threadedly connected to the valve seat 1.

[0055] More preferably, a first threaded connection portion 21 is provided on the outer wall of the valve rod 2, and a second threaded connection portion 13 matched with the first threaded connection portion 21 is provided on the inner wall of the valve seat 1.

[0056] Preferably, the air inlet nozzle 3 is threadedly connected to the valve seat 1.

[0057] More preferably, a third threaded connection portion 33 is provided on the outer wall of the air inlet nozzle 3, and a fourth threaded connection portion 14 that cooperates with the third threaded connection portion 33 is provided on the inner wall of the valve seat 1.

[0058] Preferably, the pressure reducing device further includes a sealing cover 7. The sealing cover 7 is fixedly installed on the end face of the valve seat 1 away from the valve stem 2 by fasteners such as screws and is in sealing cooperation with the valve seat 1 through a sealing ring. The valve seat 1, the air inlet nozzle 3, and the sealing cover 7 jointly enclose a high-pressure chamber 11.

[0059] In addition, in order to achieve this, a first connection hole 15 for accessing the high-pressure pipeline b1 and a second connection hole 16 for accessing the low-pressure pipeline b3 are further provided on the valve seat 1 of this embodiment. The first connection hole 15 communicates with the high-pressure chamber 11, and the second connection hole 16 communicates with the low-pressure chamber 12.

[0060] Preferably, the coffee machine further includes a first housing d, a second housing e, and a base f. The base f contacts the external installation surface. The first housing d is installed on the upper end surface of the base f and extends vertically upward from the base f. The second housing e is installed on one side surface of the first housing d and extends horizontally perpendicular to the first housing d. The main unit a is installed through the second housing e. One end of the valve seat 1 of the gas pressure reducing device b2 is fixedly connected to the first housing d by fasteners such as screws, and the other end penetrates through the first housing d and extends into the second housing e. The adjustment knob 5 is exposed outside the first housing d. The high-pressure pipeline b1 and the low-pressure pipeline b3 are both arranged inside the first housing d and the second housing e. The gas cylinder c is installed in the first housing d.

[0061] Preferably, the gas pressure reducing system b further includes a high-pressure sensor b4 and a low-pressure sensor b5. The high-pressure sensor b4 cooperates with the high-pressure pipeline b1 to detect the air pressure value of the high-pressure gas in the high-pressure pipeline b1. The low-pressure sensor b5 cooperates with the low-pressure pipeline b3 to detect the air pressure value of the low-pressure gas in the low-pressure pipeline b3.

[0062] The working principle of the gas pressure reducing device b2 of the present invention is as follows:

[0063] Taking the specific application of the gas pressure reducing device b2 of the present invention in a coffee machine as an example, this Italian coffee machine uses a gas cylinder c as the gas source. The gas cylinder c can use a commercially available 8g carbon dioxide small steel cylinder. The pressure range of the high-pressure gas in the gas cylinder c is 60 - 70 bar. For a professional Italian coffee machine, it mainly makes rich and mellow Italian coffee by soaking and filtering coffee powder with hot water at about 93 degrees Celsius under a pressure of 9 bar.

[0064] Assume that the pressure value of the high-pressure gas output by the gas cylinder c is P1, the pressure value of the low-pressure gas entering the low-pressure chamber 12 from the high-pressure chamber 11 is P0, and the pressure value for pressing the gas inlet nozzle 3 through the preset floating plugging mechanism 4 is P2. Then, P0 should satisfy: P0 ≤ P1 - P2.

[0065] The working principle of the gas pressure reducing device b2 in this embodiment is as follows: Taking the gas cylinder c with an output pressure of 65 bar (i.e., P1 = 65 bar) as an example, the pressing force for pressing the gas inlet nozzle 3 by the floating plugging mechanism 4 is set to 56 bar (i.e., P2 = 56 bar) by adjusting the adjustment knob 5 and setting the elastic member 42. In this state, the high-pressure gas in the high-pressure chamber 11 can cause the floating rod 41 of the floating plugging mechanism 4 to move away from the gas inlet nozzle 3 and enter the low-pressure chamber 12 through the air hole 32. Since the high-pressure gas overcomes the pressing force of the floating plugging mechanism 4 pressing the gas inlet nozzle 3, that is, the high-pressure gas is passively decompressed, the pressure of the gas actually entering the low-pressure chamber 12 is decompressed to 9 bar (i.e., P0 = 9 bar); when the output pressure of the gas cylinder c is lower than 65 bar or the air pressure in the low-pressure chamber 12 is greater than 9 bar, the floating plugging mechanism 4 can be reset under the action of the elastic member 42 to block the air hole 32 of the gas inlet nozzle 3 again. In this way, it can ensure that the gas entering the low-pressure chamber 12 can be stabilized at about 9 bar, and further ensure that the extraction pressure is stabilized at about 9 bar, meeting the extraction pressure requirements of a professional Italian coffee machine.

[0066] The working principle of the coffee machine applying the gas pressure reducing system b of the present invention is as follows: After the gas cylinder c is installed and punctured, the high-pressure gas in the gas cylinder c is input into the gas pressure reducing device b2 through the high-pressure pipeline b1 for decompression. The decompressed low-pressure gas is transported to the air inlet pipe b31 through the low-pressure pipeline b3. The low-pressure gas comes out from the outlet end of the air inlet pipe b31 to pressurize the water in the water tank a1. The water in the water tank a1 breaks through the one-way valve under the action of the air pressure and enters the coffee extraction chamber a2, contacts the coffee powder in the powder bowl a4, and the coffee liquid is obtained and flows out from the bottom of the powder bowl a4.

[0067] The gas pressure reducing system b of the present invention has at least the following advantages over the prior art:

[0068] 1. The present invention provides a gas pressure reducing system b with a brand-new structure. The gas pressure reducing system b is used to reduce the pressure of the high-pressure gas output by the gas cylinder c to obtain the pressure required for coffee extraction. The gas pressure reducing system b is provided with a high-pressure pipeline b1, a gas pressure reducing device b2, and a low-pressure pipeline b3. It can not only reduce the pressure but also form a complete gas path, effectively realizing the connection between the gas source and the gas-using components;

[0069] 2. The gas pressure reducing device b2 of the gas pressure reducing system b adopts a floating plugging mechanism 4. The floating plugging mechanism 4 has a certain pressing force of its own. The high-pressure gas in the high-pressure chamber 11 needs to overcome this pressing force before it can enter the low-pressure chamber 12. Thus, it can ensure that the gas entering the low-pressure chamber 12 has a stable air pressure value, which ensures the stability of the extraction pressure required for subsequent coffee making.

[0070] The gas pressure reducing device b2 adopts a disc spring 421 as the elastic member 42. The disc spring 421 has the advantages of short stroke, heavy load, small required space, easy maintenance and replacement, and long service life. Compared with the cylindrical helical compression spring used in traditional pressure reducing valves or pressure reducing structures, the elastic member 42 formed by combining the disc springs 421 has less demand for axial dimensions, thus reducing the overall volume of the pressure reducing device, and then can be effectively combined with the coffee machine, and can also achieve a large-scale pressure reducing effect.

[0071] The gas pressure reducing device b2 is provided with a bearing 6. The bearing 6 adopts a miniature thrust ball plain bearing 6, and its function is to bear axial loads, and it has the advantages of high axial load and high stiffness. At the same time, its axial space occupation is small. More importantly, the bearing 6 can realize the smooth operation of the adjusting knob 5, and the screwing process is smooth, greatly improving the user experience.

[0072] The gas pressure reducing system b of the present invention can be effectively combined with the coffee machine. As a part of the coffee machine, it not only has a simple structure but also has a beautiful appearance.

[0073] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A gas pressure reducing system for a coffee machine, which is used in conjunction with the coffee machine. The coffee machine includes a main unit (a) and a gas cylinder (c). The main unit (a) includes a water tank (a1) and a coffee extraction chamber (a2), and is characterized in that, The gas cylinder (c) is communicated with the input end of the gas pressure reducing system (b), and the output end of the gas pressure reducing system (b) is communicated with the water sump (a1). The gas pressure reducing system (b) includes a high-pressure pipeline (b1), a gas pressure reducing device (b2) and a low-pressure pipeline (b3). The input end of the high-pressure pipeline (b1) is connected to the gas cylinder (c), and the output end is connected to the high-pressure chamber (11) of the gas pressure reducing device (b2). The low-pressure chamber (12) of the gas pressure reducing device (b2) is connected to the input end of the low-pressure pipeline (b3), and the output end of the low-pressure pipeline (b3) is communicated with the water sump (a1); The gas pressure reducing device (b2) includes a valve seat (1), a valve rod (2), an air inlet nozzle (3), a floating plugging mechanism (4) and an adjusting knob (5). A high-pressure chamber (11) and a low-pressure chamber (12) are formed in the valve seat (1). The air inlet nozzle (3) is installed in the valve seat (1) and separates the high-pressure chamber (11) from the low-pressure chamber (12). An air inlet passage (31) is formed in the air inlet nozzle (3), and an air hole (32) is arranged at the end of the air inlet passage (31). The valve rod (2) is installed in the valve seat (1), and the floating plugging mechanism (4) is installed at the first end of the valve rod (2) and cooperates with the air outlet end of the air hole (32). The adjusting knob is installed at the second end of the valve rod (2) and can drive the valve rod (2) to rotate; The floating plugging mechanism (4) includes a floating rod (41) and an elastic member (42). One end of the floating rod (41) is movably sleeved on the valve rod (2), and the other end cooperates with the air hole (32). The elastic member (42) is sleeved on the outer periphery of the floating rod (41), and both ends thereof are respectively abutted against the valve rod (2) and the floating rod (41). Under the action of the elastic member (42), the floating rod (41) always elastically contacts the air inlet nozzle (3); The elastic member (42) includes at least one set of disc springs (421); Assume that the pressure value of the high-pressure gas output by the gas cylinder (c) is P1, the pressure value of the low-pressure gas entering the low-pressure chamber (12) from the high-pressure chamber (11) is P0, and the pressure value for pressing the air inlet nozzle (3) by presetting the floating plugging mechanism (4) is P2. Then P0 should satisfy: P0 ≤ P1 - P2.

2. The gas pressure reducing system for a coffee machine according to claim 1, characterized in that, A limiting boss (411) is formed at one end of the floating rod (41) away from the valve rod (2). The limiting boss (411) is movably installed in the low-pressure chamber (12) and cooperates with the air hole (32). The first end of the elastic member (42) abuts against the limiting boss (411).

3. The gas pressure reducing system for a coffee machine according to claim 2, wherein, The gas pressure reducing device (b2) further includes a bearing (6). The bearing (6) is installed at one end of the valve rod (2) away from the adjusting knob (5) and is sleeved on the outer periphery of the floating rod (41). The second end of the elastic member (42) abuts against the bearing (6).

4. The gas pressure reducing system for a coffee machine according to claim 1, characterized in that The floating plugging mechanism (4) further includes a plugging piece (43), and the plugging piece (43) is installed at the center of the end face of the floating rod (41) close to the air inlet nozzle (3) and is matched with the air hole (32).

5. The gas pressure reducing system for a coffee machine according to claim 1, characterized in that, The valve rod (2) is threadedly connected to the valve seat (1).

6. The gas pressure reducing system for a coffee machine according to claim 5, characterized in that, A first threaded connection portion (21) is provided on the outer wall of the valve rod (2), and a second threaded connection portion (13) that is matched with the first threaded connection portion (21) is provided on the inner wall of the valve seat (1).

7. The gas pressure reducing system for a coffee machine according to claim 1, wherein, The air inlet nozzle (3) is threadedly connected to the valve seat (1).

8. The gas pressure reducing system for a coffee machine according to claim 7, characterized in that, A third threaded connection portion (33) is provided on the outer wall of the air inlet nozzle (3), and a fourth threaded connection portion (14) that is matched with the third thread is provided on the inner wall of the valve seat (1).

9. The gas pressure reducing system for a coffee machine according to any one of claims 1-8, characterized in that, The gas pressure reducing device (b2) further includes a sealing cover (7), and the sealing cover (7) is installed on the end face of the valve seat (1) away from the valve rod (2) and is in sealing cooperation with the valve seat (1). The valve seat (1), the air inlet nozzle (3), and the sealing cover (7) together enclose to form the high-pressure chamber (11).

10. The gas pressure reduction system for a coffee machine according to any one of claims 1-8, characterized in that, The gas pressure reducing system (b) further includes a high-pressure sensor (b4) and a low-pressure sensor (b5). The high-pressure sensor (b4) is matched with the high-pressure pipeline (b1) and is used to detect the air pressure value of the high-pressure gas in the high-pressure pipeline (b1). The low-pressure sensor (b5) is matched with the low-pressure pipeline (b3) and is used to detect the air pressure value of the low-pressure gas in the low-pressure pipeline (b3).

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