A pressure reducing valve for a soda water cylinder

Abstract

The application discloses a pressure reducing valve suitable for a soda water cylinder, which comprises a valve body, the valve body is provided with a cylinder mounting port and a gas outlet port, the valve body is provided with a pressure reducing mechanism, the pressure reducing mechanism comprises a valve core assembly, the valve core assembly is arranged in the valve body, the valve body is provided with a gas inlet assembly, the gas inlet assembly comprises a floating piston, the valve body is provided with a piston cavity, part of the floating piston is movably arranged in the piston cavity, the floating piston divides the piston cavity into a first cavity and a second cavity, the valve core assembly is located between the first cavity and the gas outlet port, the second cavity is in communication with the outside of the valve body, the valve body is provided with a through hole, the through hole is located between the piston cavity and the cylinder mounting port, part of the floating piston is movably arranged in the through hole, the floating piston is provided with a gas inlet channel, the gas inlet channel is in communication with the first cavity and the cylinder mounting port respectively, and when the first cavity is provided with compressed gas, the floating piston can be pushed to move towards the cylinder mounting port, so that the floating piston further pushes open the valve core of the cylinder valve, and labor is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure reducing valve, in particular to a pressure reducing valve suitable for soda water cylinder. BACKGROUND

[0002] The soda water cylinder is filled with high-pressure carbon dioxide gas, if the soda water cylinder without pressure reducing valve is directly opened, the high-pressure gas will gush out at a very fast speed, which is easy to cause safety hazard, in order to ensure safety and to make soda water with better taste, the carbon dioxide gas in the cylinder needs to be reduced to a certain value by the pressure reducing valve before use, the bottle valve is arranged at the bottle mouth of the soda water cylinder, the bottle valve is used to realize sealing and opening and closing of the gas, the pressure reducing valve has a cylinder mounting port, the cylinder is screwed to the cylinder mounting port, the cylinder mounting port has a sealing element for sealing, the pressure reducing valve has a plunger matched with the bottle valve, during the screwing process, the sealing element is first compressed tightly by the cylinder mouth to ensure the sealing between the cylinder mouth and the pressure reducing valve, so as to prevent gas leakage, with the continuous screwing action, the plunger gradually pushes open the valve core of the bottle valve, the gas in the cylinder enters the cylinder mounting port, and an opposite force is applied, at this time, the valve core of the bottle valve is not completely opened, the operator still needs to continue to screw, but the subsequent screwing operation becomes laborious due to the opposite force, and even it is difficult to screw, in this case, the operator is difficult to judge whether the valve core of the bottle valve has been completely opened in place through the hand feeling, this uncertainty makes the operator difficult to control the screwing degree, which is easy to cause over-screwing, so that the sealing element is plastically deformed due to over-compression, resulting in sealing failure and safety hazard of gas leakage, therefore, it is necessary to improve. SUMMARY

[0003] The present application aims at the defects and deficiencies of the prior art, and provides a pressure reducing valve suitable for soda water cylinder, which has simple and reasonable structure and is convenient to operate, after the floating piston pushes open the valve core of the bottle valve, it is not necessary to manually screw again, the floating piston can move to the cylinder direction under the action of gas pressure, so as to further push open the valve core of the bottle valve, ensure that the valve core of the bottle valve is completely opened, realize labor saving, and the floating piston can continuously apply force to the valve core of the bottle valve, so as to ensure the supply of gas.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] The application discloses a pressure reducing valve suitable for a soda water cylinder, which comprises a valve body, wherein the valve body is provided with a cylinder mounting port and a gas outlet port, the valve body is provided with a pressure reducing mechanism, the pressure reducing mechanism comprises a valve core assembly, the valve core assembly is arranged in the valve body, the valve body is provided with a gas inlet assembly, the gas inlet assembly comprises a floating piston, the valve body is provided with a piston cavity, part of the floating piston is movably arranged in the piston cavity, the floating piston divides the piston cavity into a first cavity and a second cavity, the valve core assembly is located between the first cavity and the gas outlet port, and the second cavity is in communication with the outside of the valve body.

[0006] The valve body is provided with a through hole located between the piston cavity and the cylinder mounting port, and part of the floating piston is movably arranged in the through hole.

[0007] The floating piston is provided with a gas inlet channel, one end of the gas inlet channel is in communication with the first cavity, and the other end of the gas inlet channel is in communication with the cylinder mounting port.

[0008] When the first cavity is provided with compressed gas, the compressed gas in the first cavity can push the floating piston to move towards the cylinder mounting port.

[0009] Further, the valve body comprises a valve body and a gas inlet connector, the valve body is provided with the gas outlet port, the gas inlet connector is provided with the cylinder mounting port, the valve body and the gas inlet connector are connected in a matched mode, the piston cavity is located between the valve body and the gas inlet connector, and the through hole is arranged in the gas inlet connector.

[0010] Further, the floating piston comprises a piston part and a top rod part, the piston part is located in the piston cavity, a first sealing ring is arranged between the piston part and the circumferential wall of the piston cavity, the top rod part is movably arranged in the through hole, a second sealing ring is arranged between the top rod part and the circumferential wall of the through hole, and the piston part and the top rod part are arranged in a matched mode to form the gas inlet channel.

[0011] Further, the valve body is provided with an elastic element matched with the floating piston, and the elastic element enables the floating piston to always have a tendency to move away from the cylinder mounting port.

[0012] Further, the elastic element is a wave-shaped gasket, the wave-shaped gasket is arranged in the second cavity, and the wave-shaped gasket is matched with the floating piston.

[0013] Further, a third sealing ring is arranged in the cylinder mounting port, and the third sealing ring is matched with the bottle opening of the cylinder in a sealing mode.

[0014] Further, a filter sheet is arranged in the gas inlet channel.

[0015] Further, the valve body has a valve cavity, and the pressure reducing mechanism further comprises a pressure regulating assembly cooperating with the valve core assembly, the valve cavity comprises a first valve cavity part and a second valve cavity part, the valve core assembly is arranged in the first valve cavity part, and at least part of the pressure regulating assembly is arranged in the second valve cavity part.

[0016] Further, the valve core assembly comprises a first valve core seat, a second valve core seat, a valve core top rod, a top rod seat, a valve core spring and a sealing gasket, the first valve core seat is fixedly arranged in the first valve cavity part, the second valve core seat is fixedly connected with the first valve core seat, the first valve core seat is hollowly arranged, the valve core top rod and the top rod seat are arranged in the first valve core seat, the top rod seat is limited between the first valve core seat and the second valve core seat, the top rod seat is provided with a guide channel, the valve core top rod is slidingly arranged in the guide channel, and part of the valve core top rod is guided and matched with the circumferential wall of the guide channel, the sealing gasket is limited between the first valve core seat and the top rod seat, the sealing gasket has a valve port, part of the valve core top rod is arranged in the valve port and sealingly matched with the valve port, the valve core spring cooperates with the valve core top rod to drive the valve core top rod to move towards one side of the valve port, one end of the valve core top rod close to the pressure regulating assembly is arranged as a guide end, the first valve core seat is provided with a guide hole guided and matched with the guide end, the guide hole is coaxially arranged with the guide channel, the second valve core seat is provided with an air inlet, a gap is formed between the valve core top rod and the circumferential wall of the guide channel, the first valve core seat is provided with an air outlet, one end of the valve port is communicated with the air inlet through the gap, the other end of the valve port is communicated with the air outlet, and the air outlet is further communicated with the air outlet port.

[0017] Further, the pressure regulating assembly comprises a pressure regulating nut, a pressure regulating piston and a pressure regulating spring, the pressure regulating nut is threadedly connected with the circumferential wall of the second valve cavity part, one end of the pressure regulating spring abuts against the pressure regulating nut, and the other end of the pressure regulating spring abuts against the pressure regulating piston, the valve core assembly comprises a valve core top rod, the valve core top rod is in abutting cooperation with the pressure regulating piston, the pressure regulating piston is provided with a fourth sealing ring between the pressure regulating piston and the circumferential wall of the second valve cavity part, the circumferential wall of the second valve cavity part is provided with a pressure relief port matched with the fourth sealing ring, and the pressure relief port is located on the sliding path of the pressure regulating piston.

[0018] The beneficial effects of the present application are: the decompression valve suitable for the soda water gas cylinder, which comprises a valve body, the valve body is provided with a gas cylinder mounting port and a gas outlet port, the valve body is provided with a piston cavity and an air inlet assembly, the air inlet assembly comprises a floating piston, the floating piston is movably arranged in the piston cavity, the floating piston divides the piston cavity into a first cavity and a second cavity, the floating piston is provided with an air inlet channel, one end of the air inlet channel is communicated with the first cavity, and the other end of the air inlet channel is communicated with the gas cylinder mounting port, in the process that the gas cylinder is screwed into the gas cylinder mounting port, the top rod part of the floating piston pushes open the valve core of the bottle valve, the gas in the gas cylinder enters the first cavity through the air inlet channel, when the first cavity has compressed gas, the compressed gas in the first cavity can drive the floating piston to move towards the gas cylinder mounting port, so that the top rod part can further push open the valve core of the bottle valve, the valve core of the bottle valve is completely opened, manual labor is not needed, the problem that the sealing element is damaged due to excessive screwing is avoided, and labor-saving operation is realized; in addition, the top rod part can continuously apply force to the valve core of the bottle valve under the action of gas pressure, the valve core of the bottle valve is always in a completely open state, the stable supply of gas is ensured, and the soda water gas cylinder can continuously and stably output carbon dioxide gas. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a cross-sectional structure schematic view of the first embodiment of the present application;

[0020] Figure 2 is Figure 1 is an enlarged structure schematic view of A in the figure;

[0021] Figure 3 is Figure 1 is an enlarged structure schematic view of B in the figure;

[0022] Figure 4 is a first cross-sectional structure schematic view of the second embodiment of the present application;

[0023] Figure 5 is a second cross-sectional structure schematic view of the second embodiment of the present application;

[0024] Figure 6 is a structure schematic view of the valve core assembly.

[0025] Figures 1-6 is

[0026] 1, air inlet joint;

[0027] 11, gas cylinder mounting port; 111, third sealing ring;

[0028] 12, through hole;

[0029] 13, second step part;

[0030] 2, floating piston;

[0031] 21, ejector rod; 211, protruding column; 212, second pressure receiving surface; 213, second sealing ring;

[0032] 22, piston; 221, first pressure receiving surface; 222, first sealing ring;

[0033] 23, air inlet channel; 231, air inlet hole; 232, air outlet hole; 2321, filter;

[0034] 31, first valve core seat; 312, air outlet; 313, guide part; 314, threaded part; 315, guide hole;

[0035] 32, valve core ejector rod; 321, guide end;

[0036] 33, ejector rod seat; 331, sealing gasket; 3311, valve port; 332, guide channel;

[0037] 34, second valve core seat; 341, air inlet; 342, fifth sealing ring;

[0038] 35, valve core spring;

[0039] 4, pressure regulating assembly;

[0040] 41, pressure regulating nut;

[0041] 42, pressure regulating spring;

[0042] 43, pressure regulating piston; 431, fourth sealing ring;

[0043] 5, valve body;

[0044] 51, air outlet port;

[0045] 521, first valve cavity part; 522, pressure regulating cavity;

[0046] 53, air vent;

[0047] 54, pressure relief port;

[0048] 61, first cavity; 62, second cavity;

[0049] 63, first step part;

[0050] 7, wave-shaped gasket. DETAILED DESCRIPTION

[0051] The present application will be further described below in conjunction with the accompanying drawings.

[0052] As Figures 1-6The diagram shows a pressure reducing valve for soda water cylinders, comprising a valve body having a cylinder mounting port 11 and an outlet port 51. The cylinder mounting port 11 is connected to the cylinder, and the cylinder opening is equipped with a cylinder valve. The valve body has a pressure reducing mechanism, which includes a valve core assembly disposed within the valve body. The valve body also has an air inlet assembly, which includes a floating piston 2. The valve body has a piston chamber, and a portion of the floating piston 2 is movably disposed within the piston chamber, dividing the piston chamber into a first chamber 61 and a second chamber 62. The valve core assembly is located between the first chamber 61 and the outlet port 51. The second chamber 62 communicates with the outside of the valve body, i.e., with the atmosphere, to balance pressure and ensure that the floating piston 2 can slide normally.

[0053] refer to Figure 2 , Figure 4 The valve body is provided with a through hole 12, which is located between the piston chamber and the gas cylinder mounting port 11, and a portion of the floating piston 2 is movably inserted through the through hole 12.

[0054] The floating piston 2 has an air intake channel 23, one end of which is connected to the first chamber 61, and the other end of which is connected to the gas cylinder mounting port 11.

[0055] When the first chamber 61 contains compressed gas, the compressed gas in the first chamber 61 can push the floating piston 2 to move toward the direction of the gas cylinder mounting port 11.

[0056] Preferably, in this embodiment, the reference Figure 2 , Figure 4 The floating piston 2 includes a piston portion 22 and a push rod portion 21. The piston portion 22 and the push rod portion 21 are provided with an air intake channel 23. The piston portion 22 and the push rod portion 21 are arranged in a "T" shape on the longitudinal axis section. The piston portion 22 is located in the piston cavity. A first sealing ring 222 is provided between the piston portion 22 and the peripheral wall of the piston cavity. The piston portion 22 is slidably sealed to the peripheral wall of the piston cavity through the first sealing ring 222. In this embodiment, the piston portion 22 has a first mounting groove for installing the first sealing ring 222. Of course, in other embodiments, the first mounting groove can also be provided on the peripheral wall of the piston cavity.

[0057] The top rod part 21 movably penetrates the through hole 12, and a second sealing ring 213 is arranged between the top rod part 21 and the circumferential side wall of the through hole 12. The top rod part 21 is in sliding sealing cooperation with the circumferential side wall of the through hole 12 through the second sealing ring 213. In the embodiment, the top rod part 21 has a second mounting groove for mounting the second sealing ring 213. Of course, in other embodiments, the second mounting groove can also be arranged on the circumferential side wall of the through hole 12.

[0058] Specifically, the first sealing ring 222 and the second sealing ring 213 are both O-shaped sealing rings.

[0059] With reference to Figure 2 , one end of the piston part 22 located in the first cavity 61 has a first pressure receiving surface 221, and the gas in the first cavity 61 acts on the first pressure receiving surface 221. An end of the top rod part 21 close to the gas cylinder mounting port 11 has a second pressure receiving surface 212. Specifically, the piston part 22 and the top rod part 21 have an annular transition surface therebetween, which is the second pressure receiving surface 212. The gas in the gas cylinder mounting port 11 acts on the second pressure receiving surface 212. The area of the first pressure receiving surface 221 is greater than the area of the second pressure receiving surface 212. Because the area of the first pressure receiving surface 221 is greater than the area of the second pressure receiving surface 212, the pressure generated by the gas in the first cavity 61 acting on the first pressure receiving surface 221 is greater than the pressure generated by the gas in the gas cylinder mounting port 11 acting on the second pressure receiving surface 212. Therefore, the floating piston 2 moves to the gas cylinder direction under the action of the gas pressure.

[0060] In the prior art, the bottle port of the soda gas cylinder is provided with a bottle valve for sealing and opening and closing the gas. The pressure reducing valve has a gas cylinder mounting port 11, and the gas cylinder is mounted in the gas cylinder mounting port 11 by a threaded connection, that is, the gas cylinder is screwed into the gas cylinder mounting port 11. The gas cylinder mounting port 11 of the soda gas cylinder has a sealing element for sealing. The pressure reducing valve has a thimble cooperating with the bottle valve. During the screwing process, the sealing element is first compressed against the bottle port of the gas cylinder to ensure the sealing and prevent gas leakage. With the continuous screwing action, the thimble gradually pushes open the valve core of the bottle valve, and the gas in the gas cylinder enters the gas cylinder mounting port 11 to apply a counterforce. At this time, the valve core of the bottle valve has not been completely opened, and the operator still needs to continue screwing. However, the counterforce makes the subsequent screwing operation laborious, and even the gas cylinder is difficult to screw. In this case, the operator cannot determine whether the valve core of the bottle valve has been completely opened to the position by hand feeling. This uncertainty makes it difficult for the operator to control the screwing force, and the screwing is easily overdone, which causes the sealing element to be plastically deformed due to excessive compression, resulting in sealing failure and safety hazards of gas leakage.

[0061] It should be noted that the top pin needs to be displaced to the position and keep the current position to ensure the continuous gas output of the gas cylinder, if the tightening force is too small, the displacement of the top pin is not in place, the valve core of the cylinder valve is not completely opened, which will cause insufficient gas output, affecting the production effect of the soda water, in addition, the sealing element is easily rebounded due to insufficient stress, after rebounding, the top pin cannot keep the existing displacement state, causing the interruption of gas supply, affecting the use; if the tightening force is too large, the sealing element will be damaged.

[0062] The pressure reducing valve suitable for the soda water gas cylinder disclosed by the application, in the process of rotating the gas cylinder into the gas cylinder mounting port 11, the top rod part 21 pushes open the valve core of the cylinder valve, so that the cylinder valve is initially opened, the gas in the gas cylinder enters the first cavity 61 through the gas inlet channel 23, when the first cavity 61 has compressed gas, the compressed gas in the first cavity 61 can push the floating piston 2 to move towards the gas cylinder mounting port 11, so that the top rod part 21 can further push open the valve core of the cylinder valve, ensuring that the valve core of the cylinder valve is completely opened, without the need for the operator to manually and laboriously rotate, avoiding the problem of damage to the sealing element due to excessive rotation, and realizing labor-saving operation; in addition, the top rod part 21 can continuously apply force to the valve core of the cylinder valve under the action of gas pressure, ensuring that the valve core of the cylinder valve is always in a completely open state, ensuring the stable supply of gas, so that the soda water gas cylinder can continuously and stably output carbon dioxide gas.

[0063] In an embodiment, the piston part 22 and the top rod part 21 are integrally arranged, and the piston part 22 and the top rod part 21 are coaxially arranged, and this integrated arrangement can ensure the connection strength and movement consistency between the piston part 22 and the top rod part 21.

[0064] In another embodiment, the piston part 22 and the top rod part 21 are fixedly connected through thread connection, welding or interference fit, etc., to ensure the stability of the connection, and the piston part 22 and the top rod part 21 are coaxially arranged to ensure the stability of the floating piston 2 during movement, avoiding the situation of deviation or shaking.

[0065] Reference Figures 1-2 The valve body 5 has a first step part 63 in limiting cooperation with the piston part 22, the gas inlet connector 1 has a second step part 13 in limiting cooperation with the piston part 22, and the piston part 22 is floatingly arranged between the first step part 63 and the second step part 13. The top rod part 21 is provided with a convex column 211 at one end close to the gas cylinder mounting port 11, and at least part of the convex column 211 extends into the gas cylinder mounting port 11 and cooperates with the cylinder valve of the soda water gas cylinder.

[0066] The convex column 211 is provided with an air inlet hole 231 communicating with the gas cylinder mounting port 11, and the piston part 22 is provided with an air outlet hole 232 communicating with the first cavity 61. The two ports of the air inlet channel 23 correspond to the air inlet hole 231 and the air outlet hole 232 respectively.

[0067] Preferably, in the present embodiment, with reference to Figure 1 、 Figure 4 , the valve body includes a valve body 5 having the air outlet port 51 and an air inlet joint 1 having the gas cylinder mounting port 11. The valve body 5 is connected to the air inlet joint 1 in a mating manner, specifically, the valve body 5 and the air inlet joint 1 are connected through a threaded fitting. The end of the valve body 5 connected to the air inlet joint 1 is provided with a first external thread, and the air inlet joint 1 is provided with a first internal thread matching the first external thread, ensuring stable and reliable connection between the valve body 5 and the air inlet joint 1. The piston cavity is located between the valve body 5 and the air inlet joint 1, and the through hole 12 is provided in the air inlet joint 1.

[0068] Preferably, in the present embodiment, the valve body is provided with an elastic member cooperating with the floating piston 2. The elastic member enables the floating piston 2 to always have a tendency to move away from the gas cylinder mounting port 11.

[0069] Preferably, in the present embodiment, the elastic member is a wave washer 7, which is arranged in the second cavity 62 and abuts against the piston part 22 of the floating piston 2. After the gas cylinder is removed, the floating piston 2 can rebound under the elastic action of the wave washer 7. Compared with a conventional spring, the wave washer 7 has a smaller thickness, which can effectively save installation space.

[0070] Preferably, in the present embodiment, a third mounting groove is arranged in the gas cylinder mounting port 11, and a third sealing ring 111 is arranged in the third mounting groove. Of course, in other embodiments, the third mounting groove can also be arranged on the peripheral side wall of the piston cavity. The third sealing ring 111 sealingly cooperates with the mouth of the gas cylinder. When the gas cylinder is connected to the gas cylinder mounting port 11, the mouth of the gas cylinder first contacts and abuts against the third sealing ring 111 to form a seal, and then the convex column 211 pushes open the valve core of the cylinder valve, so that the compressed gas in the gas cylinder enters the pressure reducing valve, ensuring effective sealing and connection of the gas cylinder and the gas cylinder mounting port 11.

[0071] Preferably, the cross section of the third sealing ring 111 is oval, and the long axis direction of the oval cross section is consistent with the height direction of the third sealing ring 111 (i.e. the axial direction / thickness direction during installation or use). Compared with a conventional O-shaped sealing ring, this oval cross section design enables the third sealing ring 111 to obtain a larger compression amount while having a smaller rebound force, thereby providing a more reliable sealing effect.

[0072] Preferably, in the embodiment, the air inlet channel 23 is provided with a filter sheet 2321 for filtering impurities, and the piston part 22 is provided with a sink groove matched with the filter sheet 2321, and the filter sheet 2321 is arranged in the sink groove.

[0073] Preferably, in the embodiment, the valve body has a valve cavity and a vent port 53 between the piston cavity and the valve cavity, the pressure reducing mechanism further comprises a pressure regulating assembly 4 matched with the valve core assembly, the valve cavity comprises a first valve cavity part 521 and a second valve cavity part, the valve core assembly is arranged in the first valve cavity part 521, and at least part of the pressure regulating assembly 4 is arranged in the second valve cavity part.

[0074] Figures 1-3 is a structural schematic view of a first embodiment in the application, Figures 4-5 is a structural schematic view of a second embodiment in the application, and in the two embodiments, the valve body 5 has different shapes.

[0075] Reference is made to Figure 3 , Figure 6 Preferably, in the embodiment, the valve core assembly comprises a first valve core seat 31, a second valve core seat 34, a valve core top rod 32, a top rod seat 33, a valve core spring 35 and a sealing gasket 331, the first valve core seat 31 is fixedly arranged in the first valve cavity part 521 of the valve cavity, along the axial direction of the first valve core seat 31, the first valve core seat 31 has a guide part 313 and a threaded part 314, compared with the threaded part 314, the guide part 313 is arranged closer to the floating piston 2, the guide part 313 is matched with the circumferential side wall of the first valve cavity part 521 in a guide manner, the threaded part 314 is fixedly connected with the circumferential side wall of the first valve cavity part 521, the threaded part 314 is provided with a second external thread, the circumferential side wall of the first valve cavity part 521 has a second internal thread matched with the second external thread, so as to ensure stable and reliable connection.

[0076] The second valve core seat 34 is fixedly connected with the first valve core seat 31, an outer peripheral wall of the second valve core seat 34 is provided with a third external thread, and an inner peripheral wall of the first valve core seat 31 has a third internal thread matched with the third external thread, so that the connection is stable and reliable. The first valve core seat 31 is hollow, the valve core top rod 32, the top rod seat 33 and the valve core spring 35 are all arranged in the first valve core seat 31, the top rod seat 33 is axially limited between the first valve core seat 31 and the second valve core seat 34, the valve core top rod 32 is arranged in the top rod seat 33 and can slide along the axial direction of the top rod seat 33, the sealing gasket 331 is axially limited between the first valve core seat 31 and the top rod seat 33, the top rod seat 33 is provided with a guide channel 332, the valve core top rod 32 is slidingly arranged in the guide channel 332, and part of the valve core top rod 32 is guided by the peripheral side wall of the guide channel 332. The sealing gasket 331 is limited between the first valve core seat 31 and the top rod seat 33, the sealing gasket 331 has a valve port 3311, part of the valve core top rod 32 penetrates the valve port 3311 and sealingly cooperates with the valve port 3311, the valve core spring 35 cooperates with the valve core top rod 32 to drive the valve core top rod 32 to move towards the side of the valve port 3311, the valve core top rod 32 is a conical structure, the outer diameter of the valve core top rod 32 far away from the valve port 3311 decreases towards the side adjacent to the valve port 3311, and in the process of continuously penetrating into the valve port 3311, the gap between the valve core top rod 32 and the inner wall of the valve port 3311 gradually decreases until the valve port 3311 is blocked.

[0077] The fifth sealing ring 342 is arranged between the second valve core seat 34 and the first valve core seat 31. In this embodiment, the second valve core seat 34 is provided with a fifth mounting groove for mounting the fifth sealing ring 342. Of course, in other embodiments, the fifth mounting groove can also be arranged on the inner wall of the first valve core seat 31.

[0078] The valve core top rod 32 is provided with a guide end 321 close to the pressure regulating assembly 4, the guide end 321 is connected with the pressure regulating assembly 4 in a matched mode, and the pressure regulating assembly 4 is used for adjusting the opening degree between the valve core top rod 32 and the valve port 3311.

[0079] The first valve core seat 31 is provided with a guide hole 315 guided with the guide end 321, the guide hole 315 is coaxially arranged with the guide channel 332, the guide channel 332 and the guide hole 315 play a guiding and supporting role for the valve core top rod 32, avoid the valve core top rod 32 from shaking unexpectedly, ensure the smooth movement of the valve core top rod 32, the second valve core seat 34 is provided with an air inlet 341, a gap is formed between the valve core top rod 32 and the peripheral side wall of the guide channel 332, the first valve core seat 31 is provided with an air outlet 312, one end of the valve port 3311 communicates with the air inlet 341 through the gap, the other end of the valve port 3311 communicates with the air outlet 312, the air outlet 312 also communicates with the air outlet port 51, the compressed gas in the first cavity 61 passes through the air inlet port 53, the air inlet 341, the valve port 3311 and the air outlet 312 in turn, and finally flows out to the air outlet port 51.

[0080] In the installation, the valve core assembly can be pre-assembled into an integral whole, and then installed into the first valve cavity portion 521 as a whole, so as to improve the assembly efficiency.

[0081] Preferably, in the embodiment, the pressure regulating assembly 4 includes a pressure regulating nut 41, a pressure regulating piston 43 and a pressure regulating spring 42, the pressure regulating nut 41 is threadedly connected with the peripheral side wall of the second valve cavity portion, one end of the pressure regulating spring 42 abuts against the pressure regulating nut 41, the other end of the pressure regulating spring 42 abuts against the pressure regulating piston 43, the pressure regulating spring 42 drives the pressure regulating piston 43 to move towards the side of the valve port 3311, the valve core assembly includes the valve core top rod 32, the valve core top rod 32 is in abutting engagement with the pressure regulating piston 43, by rotating the pressure regulating nut 41, the pressure regulating spring 42 acts on the pressure regulating piston 43 to change the displacement of the pressure regulating piston 43, and then adjust the opening between the valve core top rod 32 and the valve port 3311, and then adjust the outlet air pressure.

[0082] The fourth sealing ring 431 is arranged between the pressure regulating piston 43 and the circumferential wall of the second valve cavity portion. In the embodiment, the pressure regulating piston 43 is provided with a fourth mounting groove for mounting the fourth sealing ring 431. Of course, in other embodiments, the fourth mounting groove can also be arranged on the circumferential wall of the second valve cavity portion. The pressure regulating piston 43 is in sliding sealing cooperation with the circumferential wall of the second valve cavity portion through the fourth sealing ring 431. The pressure regulating piston 43 is arranged with a pressure regulating cavity 522 which is in communication with the gas outlet 312 of the valve core assembly. The circumferential wall of the second valve cavity portion is provided with a pressure relief port 54 which cooperates with the fourth sealing ring 431. The compressed gas in the pressure regulating cavity 522 is in communication with the outside atmosphere through the pressure relief port 54. The pressure relief port 54 is located on the sliding path of the pressure regulating piston 43. Preferably, the fourth sealing ring 431 is a Y-shaped sealing ring. The opening of the Y-shaped sealing ring faces away from the side of the pressure regulating spring 42. Under normal circumstances, the Y-shaped sealing ring is used to block the communication between the pressure regulating cavity 522 and the pressure relief port 54, so that the compressed gas in the pressure regulating cavity 522 cannot be discharged through the pressure relief port 54. When the gas pressure in the pressure regulating cavity 522 exceeds the preset threshold value, the gas pressure pushes the pressure regulating piston 43 to slide, thereby driving the Y-shaped sealing ring to move synchronously. When the Y-shaped sealing ring moves to no longer be able to seal the pressure relief port 54, the high-pressure gas in the pressure regulating cavity 522 can be in communication with the outside through the pressure relief port 54, thereby achieving pressure relief.

[0083] In the prior art, the pressure reducing valve needs to be additionally provided with a pressure relief device to achieve the pressure relief function. However, the pressure reducing valve suitable for the soda water bottle of the present application does not need to be additionally provided with a pressure relief device, thereby effectively saving the cost.

[0084] The above description is only the preferred embodiment of the present application, and any equivalent changes or modifications made to the structure, features and principles described in the scope of the present application are included in the scope of the present application.

Claims

1. A pressure reducing valve suitable for soda water cylinder, comprising a valve body having a cylinder mounting port (11) and a gas outlet port (51), the valve body is provided with a pressure reducing mechanism, the pressure reducing mechanism comprises a valve core assembly, the valve core assembly is arranged in the valve body, characterized in that: the valve body is provided with a gas inlet assembly, the gas inlet assembly comprises a floating piston (2), the valve body is provided with a piston cavity, part of the floating piston (2) is movably arranged in the piston cavity, the floating piston (2) divides the piston cavity into a first cavity (61) and a second cavity (62), the valve core assembly is located between the first cavity (61) and the gas outlet port (51), the second cavity (62) is in communication with the outside of the valve body; the valve body is provided with a through hole (12), the through hole (12) is located between the piston cavity and the cylinder mounting port (11), part of the floating piston (2) movably passes through the through hole (12); the floating piston (2) has a gas inlet channel (23), one end of the gas inlet channel (23) is in communication with the first cavity (61), the other end of the gas inlet channel (23) is in communication with the cylinder mounting port (11); the valve body has a valve cavity, the pressure reducing mechanism further comprises a pressure regulating assembly (4) matched with the valve core assembly, the valve cavity comprises a first valve cavity part (521) and a second valve cavity part, the pressure regulating assembly (4) comprises a pressure regulating piston (43), a fourth sealing ring (431) is arranged between the pressure regulating piston (43) and the circumferential wall of the second valve cavity part, the circumferential wall of the second valve cavity part is provided with a pressure relief port (54) matched with the fourth sealing ring (431), the pressure relief port (54) is located on the sliding path of the pressure regulating piston (43); when the first cavity (61) has compressed gas, the compressed gas in the first cavity (61) can push the floating piston (2) to move towards the cylinder mounting port (11). The valve body comprises a valve body (5) and a gas inlet connector (1), the valve body (5) has the gas outlet port (51), the gas inlet connector (1) has the cylinder mounting port (11), the valve body (5) and the gas inlet connector (1) are connected in a matched mode, the piston cavity is located between the valve body (5) and the gas inlet connector (1), and the through hole (12) is arranged in the gas inlet connector (1). The floating piston (2) comprises a piston part (22) and a top rod part (21), the piston part (22) is located in the piston cavity, a first sealing ring (222) is arranged between the piston part (22) and the circumferential wall of the piston cavity, the top rod part (21) movably passes through the through hole (12), a second sealing ring (213) is arranged between the top rod part (21) and the circumferential wall of the through hole (12), and the piston part (22) and the top rod part (21) are matched to be provided with the gas inlet channel (23). The valve body is provided with an elastic member matched with the floating piston (2), the elastic member makes the floating piston (2) always have a tendency to move away from the cylinder mounting port (11). ​ ​ 2. A pressure reducing valve for a carbonated beverage cylinder according to claim 1, wherein: ​ 3. A pressure reducing valve for use with a carbonated beverage cylinder as defined in claim 1, wherein: ​ 4. A pressure reducing valve for a carbonated beverage cylinder according to claim 1 or 3, wherein: ​ 5. A pressure reducing valve for a carbonated beverage cylinder according to claim 4, wherein: The elastic member is a wave washer (7), the wave washer (7) is arranged in the second cavity (62), and the wave washer (7) is matched with the floating piston (2).

6. A pressure reducing valve for use with a carbonated beverage cylinder as defined in claim 1, wherein: The gas cylinder mounting port (11) is provided with a third sealing ring (111), and the third sealing ring (111) is sealingly matched with the bottle opening of the gas cylinder.

7. A pressure reducing valve for use with a carbonated beverage cylinder as defined in claim 1, wherein: The air inlet channel (23) is provided with a filter sheet (2321).

8. A pressure reducing valve for use with a carbonated beverage cylinder as defined in claim 1, wherein: The valve core assembly is arranged in the first valve cavity portion (521), and at least part of the pressure regulating assembly (4) is arranged in the second valve cavity portion.

9. A pressure reducing valve for a carbonated beverage cylinder according to claim 8, wherein: The valve core assembly comprises a first valve core seat (31), a second valve core seat (34), a valve core top rod (32), a top rod seat (33), a valve core spring (35) and a sealing gasket (331), the first valve core seat (31) is fixedly arranged in the first valve cavity portion (521), the second valve core seat (34) is fixedly connected with the first valve core seat (31), the first valve core seat (31) is arranged in a hollow manner, the valve core top rod (32) and the top rod seat (33) are arranged in the first valve core seat (31), the top rod seat (33) is limited between the first valve core seat (31) and the second valve core seat (34), the top rod seat (33) is provided with a guide channel (332), the valve core top rod (32) is slidingly arranged in the guide channel (332), part of the valve core top rod (32) is guided in cooperation with the circumferential wall of the guide channel (332), the sealing gasket (331) is limited between the first valve core seat (31) and the top rod seat (33), the sealing gasket (331) has a valve port (3311), part of the valve core top rod (32) is arranged in the valve port (3311) and sealingly cooperates with the valve port (3311), the valve core spring (35) cooperates with the valve core top rod (32) to drive the valve core top rod (32) to move towards the valve port (3311), one end of the valve core top rod (32) close to the pressure regulating assembly (4) is provided as a guide end (321), the first valve core seat (31) is provided with a guide hole (315) in guided cooperation with the guide end (321), the guide hole (315) is coaxially arranged with the guide channel (332), the second valve core seat (34) is provided with an air inlet (341), a gap is formed between the valve core top rod (32) and the circumferential wall of the guide channel (332), the first valve core seat (31) is provided with an air outlet (312), one end of the valve port (3311) communicates with the air inlet (341) through the gap, the other end of the valve port (3311) communicates with the air outlet (312), and the air outlet (312) further communicates with the air outlet port (51).

10. A pressure reducing valve for use with a carbonated beverage cylinder as defined in claim 8, wherein: The pressure regulating assembly (4) comprises a pressure regulating nut (41) and a pressure regulating spring (42), the pressure regulating nut (41) is in threaded connection with the peripheral side wall of the second valve cavity part, one end of the pressure regulating spring (42) is in abutment with the pressure regulating nut (41), the other end of the pressure regulating spring (42) is in abutment with a pressure regulating piston (43), the valve core assembly comprises a valve core top rod (32), the valve core top rod (32) is in abutment with the pressure regulating piston (43).

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