A diving constant pressure valve

Abstract

The present invention relates to a diving constant pressure valve, comprising: a valve body, one end of which is connected to a gas cylinder and the other end is connected to a breathing apparatus; a constant pressure chamber, formed within the valve body and communicating with the breathing apparatus; a piston assembly, located within the constant pressure chamber and capable of linearly moving within the constant pressure chamber to reciprocally slide between a first position and a second position; pressure regulation is achieved through the linear movement of the piston assembly. When the air pressure introduced into the constant pressure chamber is too high, it pushes the piston assembly to slide from the first position to the second position. At the same time, the piston assembly blocks the gas supply from the gas cylinder, and the gas within the constant pressure chamber flows towards the breathing apparatus to release the pressure; when the air pressure within the constant pressure chamber decreases, the piston assembly resets from the second position to the first position, reconnecting the constant pressure chamber with the gas cylinder to initiate a new round of pressure regulation cycle, thereby obtaining a stable and safe low-pressure output and avoiding the problems of unstable and insufficient low-pressure output when the high pressure of the gas cylinder decreases.

Description

Technical Field

[0001] The present invention relates to the technical field of diving equipment, and particularly to a diving constant pressure valve. Background Art

[0002] In diving equipment, before the gas in the gas cylinder is supplied to a person for breathing, it needs to pass through a constant pressure valve first to adjust the high-pressure gas in the gas cylinder into a stable low-pressure gas, and then introduce it into a breathing apparatus for the person to inhale oxygen while diving. The gas pressure after pressure regulation by the existing constant pressure valve is unstable, and the gas introduced into the breathing apparatus may be greater than the safe air pressure. Moreover, when the high pressure of the gas cylinder decreases, it will affect the low-pressure output of the constant pressure valve, resulting in insufficient and unstable low-pressure output. Therefore, it is necessary to provide a diving constant pressure valve that can obtain stable and safe gas after pressure regulation and avoid the problems of unstable and insufficient low-pressure output when the high pressure of the gas cylinder decreases. Summary of the Invention

[0003] The purpose of the present invention is to provide a diving constant pressure valve that can obtain stable and safe gas after pressure regulation and avoid the problems of unstable and insufficient low-pressure output when the high pressure of the gas cylinder decreases.

[0004] According to one aspect of the present invention, there is provided a diving constant pressure valve, comprising:

[0005] A valve body, one end of which is connected to a gas cylinder and the other end is connected to a breathing apparatus;

[0006] A constant pressure chamber, formed in the valve body and communicating with the breathing apparatus;

[0007] A piston assembly, located in the constant pressure chamber and capable of linearly moving in the constant pressure chamber to reciprocate between a first position and a second position;

[0008] When the piston assembly is in the first position, the constant pressure chamber is connected to the gas cylinder, and the gas in the gas cylinder enters the constant pressure chamber, increasing the air pressure in the constant pressure chamber, and the piston assembly slides from the first position to the second position under the action of the air pressure;

[0009] When the piston assembly is in the second position, the piston assembly blocks the connection between the constant pressure chamber and the gas cylinder, and the gas in the constant pressure chamber flows towards the breathing apparatus, reducing the air pressure in the constant pressure chamber, and then causing the piston assembly to slide from the second position to the first position, connecting the constant pressure chamber to the gas cylinder.

[0010] Preferably, the linear direction of sliding from the first position to the second position is denoted as the first direction,

[0011] The constant pressure chamber includes:

[0012] a first chamber in communication with the respirator;

[0013] a second chamber, connected to the gas cylinder;

[0014] The piston assembly comprises:

[0015] an upper piston, located in the first chamber;

[0016] a lower piston, located in the second chamber;

[0017] A push rod, connected to the upper piston and the lower piston respectively;

[0018] When the piston assembly is located at the second position, the lower piston blocks the first chamber and the second chamber, and the gas in the first chamber flows toward the respirator, reducing the air pressure in the first chamber, thereby causing the piston assembly to slide from the second position to the first position along the first direction, connecting the first chamber with the second chamber.

[0019] More preferably, the piston assembly further comprises:

[0020] A first return spring, along the first direction, the first return spring is located at one end of the upper piston away from the lower piston, and one end of the first return spring abuts against the top of the first chamber, and the other end abuts against the upper piston, and the acting direction of the first return spring is the first direction;

[0021] When the gas in the gas cylinder enters the first chamber and the gas pressure in the first chamber increases, the upper piston overcomes the force of the first return spring under the action of the gas pressure and causes the piston assembly to slide from the first position to the second position;

[0022] When the gas in the first chamber flows toward the respirator and the air pressure in the first chamber decreases, the upper piston overcomes the force of the air pressure under the action of the first return spring, causing the piston assembly to slide from the second position to the first position along the first direction, thereby connecting the first chamber with the second chamber.

[0023] More preferably, the second cavity is further provided with:

[0024] an abutment member, fixed to the second cavity;

[0025] The piston assembly also includes:

[0026] A second return spring, along the first direction, the second return spring is located at an end of the lower piston away from the upper piston, and one end of the second return spring abuts against the abutting member, and the other end abuts against the lower piston. The acting force direction of the second return spring is the first direction;

[0027] When the gas in the gas cylinder enters the first chamber and increases the air pressure in the first chamber, the lower piston is driven by the upper piston to overcome the acting force of the second return spring, so that the piston assembly slides from the first position to the second position;

[0028] When the gas in the first chamber flows to the respirator and reduces the air pressure in the first chamber, the lower piston is driven by the upper piston and under the action of the first return spring to overcome the acting force of the air pressure, so that the piston assembly slides from the second position to the first position along the first direction, thereby connecting the first chamber and the second chamber.

[0029] More preferably, the piston assembly further includes:

[0030] A connecting member, disposed between the first chamber and the second chamber, and the interior of the connecting member is penetrated to connect the first chamber and the second chamber;

[0031] A first opening is formed at an end of the connecting member close to the second chamber. When the piston assembly is in the first position, the first opening is separated from the lower piston; when the piston assembly is in the second position, the first opening is in contact with the lower piston, and the lower piston blocks the first opening.

[0032] More preferably, along the first direction, a connecting groove is recessed at an end of the upper piston close to the lower piston;

[0033] A second opening is formed at an end of the connecting member close to the first chamber. When the piston assembly is at any position between the first position and the second position, the connecting groove connects the second opening and the respirator.

[0034] More preferably, a first through hole penetrating the first chamber along the first direction is formed on the valve body,

[0035] The diving constant pressure valve further includes:

[0036] A water isolation film, disposed at one end of the valve body, and when observed along the first direction, the water isolation film completely covers the first through hole.

[0037] More preferably, the diving constant pressure valve further includes:

[0038] Low-pressure safety valve, a first passage communicating the low-pressure safety valve with the first chamber is formed in the valve body, and a second passage communicating the first passage with the outside is formed in the low-pressure safety valve;

[0039] The low-pressure safety valve includes:

[0040] An end cap,

[0041] A low-pressure safety plug, located between the first passage and the second passage,

[0042] A third return spring, located between the end cap and the low-pressure safety plug, and one end of the third return spring abuts against the end cap, and the other end abuts against the low-pressure safety plug,

[0043] A protrusion is formed at one end of the first passage close to the low-pressure safety plug, and the low-pressure safety plug abuts against the protrusion under the action of the third return spring and blocks the second passage;

[0044] When the air pressure in the first chamber is greater than the safety value, the low-pressure safety plug overcomes the acting force of the third return spring under the action of the air pressure and separates from the second passage to communicate the first passage and the second passage.

[0045] Preferably, the diving constant pressure valve further includes:

[0046] A medium-pressure pipe, communicating the first chamber with the breathing apparatus;

[0047] An air inlet nozzle, communicating the second chamber with the gas cylinder, a third passage is formed between the air inlet nozzle and the second chamber, and a fourth passage is formed between the air inlet nozzle and the gas cylinder.

[0048] Preferably, the diving constant pressure valve further includes:

[0049] An air source switch, located between the gas cylinder and the air inlet nozzle, and the air source switch blocks or opens the fourth passage;

[0050] A high-pressure safety valve, communicating with the gas cylinder;

[0051] A pressure gauge, communicating with the gas cylinder.

[0052] The present invention has the following beneficial effects:

[0053] The pressure regulation is achieved through the linear movement of the piston assembly. When the air pressure in the constant pressure chamber is too high, it pushes the piston assembly to slide from the first position to the second position. At the same time, the piston assembly blocks the gas supply from the gas cylinder, and the gas in the constant pressure chamber flows towards the breathing apparatus, releasing the pressure. When the air pressure in the constant pressure chamber decreases, the piston assembly resets from the second position to the first position, reconnecting the constant pressure chamber with the gas cylinder and starting a new pressure regulation cycle, thereby obtaining a stable and safe low-pressure output. At the same time, when the high pressure in the gas cylinder decreases, that is, when the air pressure flowing into the constant pressure chamber decreases, the piston assembly is in a state where the constant pressure chamber is connected to the gas cylinder, and the constant pressure chamber always remains connected to the breathing apparatus. Even if the high pressure in the gas cylinder decreases, it will not affect the output of the low-pressure gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0055] Figure 1 Schematic perspective view of a diving constant pressure valve according to an embodiment of the present invention;

[0056] Figure 2 Another schematic perspective view of a diving constant pressure valve according to an embodiment of the present invention;

[0057] Figure 3 Exploded view of a diving constant pressure valve according to an embodiment of the present invention;

[0058] Figure 4 Top view of a diving constant pressure valve according to an embodiment of the present invention;

[0059] Figure 5 For Figure 4 Schematic cross-sectional view taken along line A-A in , and corresponding to the state when the piston assembly is in the first position;

[0060] Figure 6 For Figure 5 Corresponding to the state when the piston assembly is in the second position;

[0061] Figure 7 For Figure 4 Schematic cross-sectional view taken along line B-B in ;

[0062] Figure 8 For Figure 4 Schematic cross-sectional view taken along line C-C in ;

[0063] Figure 9 ForFigure 4 Schematic cross-sectional view at D-D in [the figure];

[0064] Figure 10 is Figure 4 Schematic cross-sectional view at E-E in [the figure];

[0065] Figure 11 is Figure 4 Schematic cross-sectional view at F-F in [the figure];

[0066] Figure 12 Another three-dimensional structure schematic diagram of the diving constant pressure valve according to an embodiment of the present invention;

[0067] Figure 13 is Figure 12 Schematic cross-sectional view at G-G in [the figure];

[0068] Explanation of the reference numerals in the attached drawings: 100, diving constant pressure valve; 10, valve body; 200, gas cylinder; 300, breathing apparatus; 20, constant pressure chamber; 30, piston assembly; D1, first position; D2, second position; F1, first direction; 21, first chamber; 22, second chamber; 31, upper piston; 32, lower piston; 33, push rod; 34, first return spring; 35, second return spring; 36, connecting member; 41, first opening; 42, connecting groove; 43, second opening; 44, first through hole; 37, water isolation membrane; 50, low-pressure safety valve; 45, first channel; 46, second channel; 51, end cover; 52, low-pressure safety plug; 53, third return spring; 47, protrusion; 61, medium-pressure pipe; 62, air inlet nozzle; 48, third channel; 49, fourth channel; 63, gas source switch; 64, high-pressure safety valve; 65, pressure gauge; 11, upper valve body; 12, lower valve body; 221, abutting member; Detailed implementation manners

[0069] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0070] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0072] Please refer to Figures 1 - 13 , an embodiment of the present invention provides a diving constant pressure valve 100, including: a valve body 10, a constant pressure chamber 20, and a piston assembly 30.

[0073] Wherein, one end of the valve body 10 is connected to the gas cylinder 200, and the other end of the valve body 10 is connected to the breathing apparatus 300. The constant pressure chamber 20 is formed in the valve body 10 and is in communication with the breathing apparatus 300. The piston assembly 30 is located in the constant pressure chamber 20 and can linearly move in the constant pressure chamber 20 to reciprocate between a first position D1 and a second position D2. When the piston assembly 30 is located at the first position D1, the constant pressure chamber 20 is in communication with the gas cylinder 200, and the gas in the gas cylinder 200 enters the constant pressure chamber 20, increasing the air pressure in the constant pressure chamber 20. Under the action of the air pressure, the piston assembly 30 slides from the first position D1 to the second position D2. When the piston assembly 30 is located at the second position D2, the piston assembly 30 blocks the constant pressure chamber 20 from the gas cylinder 200, and the gas in the constant pressure chamber 20 flows to the breathing apparatus 300, reducing the air pressure in the constant pressure chamber 20. As a result, the piston assembly 30 slides from the second position D2 to the first position D1, connecting the constant pressure chamber 20 with the gas cylinder 200, thereby performing a new round of pressure regulation cycle.

[0074] In an embodiment, the linear direction of sliding from the first position D1 to the second position D2 is denoted as the first direction F1. The constant pressure chamber 20 includes: a first chamber 21 and a second chamber 22. Among them, the first chamber 21 is communicated with the breathing apparatus 300, and the second chamber 22 is communicated with the gas cylinder 200. The piston assembly 30 includes: an upper piston 31, a lower piston 32, and a push rod 33. Among them, the upper piston 31 is located in the first chamber 21, the lower piston 32 is located in the second chamber 22, and the push rod 33 is connected to the upper piston 31 and the lower piston 32 respectively. When the piston assembly 30 is located at the second position D2, the lower piston 32 blocks the first chamber 21 and the second chamber 22, and the gas in the first chamber 21 flows to the breathing apparatus 300, causing the air pressure in the first chamber 21 to decrease. Furthermore, the piston assembly 30 slides along the first direction F1 from the second position D2 to the first position D1, causing the first chamber 21 and the second chamber 22 to be communicated. At the same time, when the high pressure in the gas cylinder 200 decreases, that is, when the air pressure flowing into the constant pressure chamber 20 decreases, the piston assembly 30 is in a state where the constant pressure chamber 20 is communicated with the gas cylinder 200, and the constant pressure chamber 20 always remains in a state of being communicated with the breathing apparatus 300. Even if the high pressure of the gas cylinder decreases, it will not affect the output of low-pressure gas.

[0075] In an embodiment, the piston assembly 30 further includes: a first return spring 34.

[0076] Among them, along the first direction F1, the first return spring 34 is located at one end of the upper piston 31 facing away from the lower piston 32, and one end of the first return spring 34 abuts against the top of the first chamber 21, and the other end abuts against the upper piston 31. The acting force direction of the first return spring 34 is the first direction F1. When the gas in the gas cylinder 200 enters the first chamber 21, causing the air pressure in the first chamber 21 to increase, the upper piston 31 overcomes the acting force of the first return spring 34 under the action of the air pressure, causing the piston assembly 30 to slide from the first position D1 to the second position D2. When the gas in the first chamber 21 flows to the breathing apparatus 300, causing the air pressure in the first chamber 21 to decrease, the upper piston 31 overcomes the acting force of the air pressure under the action of the first return spring 34, causing the piston assembly 30 to slide along the first direction F1 from the second position D2 to the first position D1, and further causing the first chamber 21 and the second chamber 22 to be communicated.

[0077] Specifically, a contact member 221 is further provided in the second chamber 22, and the contact member 221 is fixed to the second chamber 22. The piston assembly 30 further includes: a second return spring 35.

[0078] Among them, along the first direction F1, the second return spring 35 is located at one end of the lower piston 32 away from the upper piston 31, and one end of the second return spring 35 abuts against the abutting member 221, and the other end abuts against the lower piston 32. The acting force direction of the second return spring 35 is the first direction F1. When the gas in the gas cylinder 200 enters the first chamber 21 and the air pressure in the first chamber 21 increases, the lower piston 32 is driven by the upper piston 31 to overcome the acting force of the second return spring 35, so that the piston assembly 30 slides from the first position D1 to the second position D2. When the gas in the first chamber 21 flows to the respirator 300 and the air pressure in the first chamber 21 decreases, the lower piston 32 is driven by the upper piston 31 and under the action of the first return spring 34 to overcome the acting force of the air pressure, so that the piston assembly 30 slides from the second position D2 to the first position D1 along the first direction F1, thereby connecting the first chamber 21 and the second chamber 22.

[0079] In an embodiment, the piston assembly 30 further includes: a connecting member 36.

[0080] Among them, the connecting member 36 is arranged between the first chamber 21 and the second chamber 22, and the inside of the connecting member 36 is penetrated to connect the first chamber 21 and the second chamber 22. A first opening 41 is formed at one end of the connecting member 36 close to the second chamber 22. When the piston assembly 30 is in the first position D1, the first opening 41 is separated from the lower piston 32; when the piston assembly 30 is in the second position D2, the first opening 41 is in contact with the lower piston 32, and the lower piston 32 blocks the first opening 41.

[0081] Among them, along the first direction F1, a connecting groove 42 is formed by recessing one end of the upper piston 31 close to the lower piston 32. A second opening 43 is formed at one end of the connecting member 36 close to the first chamber 21. When the piston assembly 30 is at any position between the first position D1 and the second position D2, the connecting groove 42 connects the second opening 43 and the respirator 300. So that when the air pressure in the gas cylinder 200 is extremely low, the gas can still flow to the respirator 300.

[0082] In one embodiment, a first through hole 44 is formed in the valve body 10 and penetrates through the first chamber 21 along the first direction F1. The diving constant pressure valve 100 further includes a water isolation membrane 37. The water isolation membrane 37 is disposed at one end of the valve body 10, and when observed along the first direction F1, the water isolation membrane 37 completely covers the first through hole 44. The valve body 10 includes an upper valve body 11 and a lower valve body 12. The first chamber 21 is located in the upper valve body 11, and the second chamber 22 is located in the lower valve body 12. The water isolation membrane 37 is disposed on the upper valve body 11 to prevent water from entering the valve body 10, thereby protecting the device from rusting.

[0083] Specifically, the diving constant pressure valve 100 further includes a low pressure safety valve 50. A first channel 45 communicating the low pressure safety valve 50 with the first chamber 21 is formed in the valve body 10, and a second channel 46 communicating the first channel 45 with the outside is formed in the low pressure safety valve 50.

[0084] The low pressure safety valve 50 includes an end cap 51, a low pressure safety plug 52, and a third return spring 53. The low pressure safety plug 52 is located between the first channel 45 and the second channel 46, and the third return spring 53 is located between the end cap 51 and the low pressure safety plug 52. One end of the third return spring 53 abuts against the end cap 51, and the other end abuts against the low pressure safety plug 52. A protrusion 47 is formed at one end of the first channel 45 close to the low pressure safety plug 52. The low pressure safety plug 52 abuts against the protrusion 47 under the action of the third return spring 53 and blocks the second channel 46. When the air pressure in the first chamber 21 is greater than the safety value, the low pressure safety plug 52 overcomes the acting force of the third return spring 53 under the action of the air pressure and separates from the second channel 46 to communicate the first channel 45 and the second channel 46. Thus, when the air pressure of the gas flowing to the breathing apparatus 300 after pressure regulation in the constant pressure chamber 20 is still greater than the safety value, the gas will leak out from the second channel 46 to release the pressure, thereby achieving the purpose of reducing the air pressure.

[0085] In one embodiment, the diving constant pressure valve 100 further includes a medium pressure pipe 61, an air inlet nozzle 62, an air source switch 63, a high pressure safety valve 64, and a pressure gauge 65.

[0086] Among them, the medium-pressure pipe 61 communicates the first chamber 21 with the breathing apparatus 300, and the medium-pressure pipe 61 is rotatably connected to the valve body 10. One end of the medium-pressure pipe 61 is connected to the valve body 10, and the other end is connected to the breathing apparatus 300. Since the medium-pressure pipe 61 can rotate relative to the valve body 10, when the user bites the breathing apparatus 300 in the mouth and the head rotates, the obstruction feeling can be reduced. The air inlet nozzle 62 communicates the second chamber 22 with the gas cylinder 200. The air inlet nozzle 62 and the second chamber 22 form a third passage 48, and the air inlet nozzle 62 and the gas cylinder 200 form a fourth passage 49. High-pressure gas is filled into the gas cylinder 200 through the air inlet nozzle 62. The gas source switch 63 is located between the gas cylinder 200 and the air inlet nozzle 62, and the gas source switch 63 blocks or opens the fourth passage 49 to effectively store the gas in the gas cylinder 200 and reduce the leakage of gas during storage. The high-pressure safety valve 64 is connected to the gas cylinder 200 to prevent the air pressure from being too high when the gas cylinder 200 is inflated, so as to protect the safety of the product and personnel. The pressure gauge 65 is connected to the gas cylinder 200 to display the air pressure in the gas cylinder 200.

[0087] Thereby, pressure regulation is achieved through the linear movement of the piston assembly 30. When the air pressure introduced into the constant pressure chamber 20 is too high, the piston assembly 30 is pushed to slide from the first position D1 to the second position D2. At the same time, the piston assembly 30 blocks the air supply of the gas cylinder 200, and the gas in the constant pressure chamber 20 flows to the breathing apparatus 300 to release the pressure. When the air pressure in the constant pressure chamber 20 decreases, the piston assembly 30 resets from the second position D2 to the first position D1, reconnects the constant pressure chamber 20 with the gas cylinder 200, and starts a new round of pressure regulation cycle, so as to obtain a stable and safe low-pressure output. At the same time, when the high pressure in the gas cylinder 200 decreases, that is, when the air pressure flowing into the constant pressure chamber 20 decreases, the piston assembly 30 is in a state where the constant pressure chamber 20 is connected to the gas cylinder 200, and at the same time, the constant pressure chamber 20 always remains connected to the breathing apparatus 300. Even if the high pressure of the gas cylinder decreases, it will not affect the output of low-pressure gas.

[0088] The above embodiments only represent several embodiments of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of this invention patent shall be subject to the appended claims.

Claims

1. A diving constant pressure valve, characterized in that, Comprising: A valve body, one end of which is connected to a gas cylinder and the other end is connected to a breathing apparatus; A constant pressure chamber, formed within the valve body and communicating with the breathing apparatus; A piston assembly, located within the constant pressure chamber and capable of linearly moving within the constant pressure chamber to reciprocally slide between a first position and a second position; When the piston assembly is at the first position, the constant pressure chamber is in communication with the gas cylinder, and the gas within the gas cylinder enters the constant pressure chamber, increasing the air pressure within the constant pressure chamber. Under the action of the air pressure, the piston assembly slides from the first position to the second position; When the piston assembly is at the second position, the piston assembly blocks the constant pressure chamber from the gas cylinder, and the gas within the constant pressure chamber flows towards the breathing apparatus, reducing the air pressure within the constant pressure chamber. As a result, the piston assembly slides from the second position to the first position, causing the constant pressure chamber to be in communication with the gas cylinder; The linear direction of sliding from the first position to the second position is denoted as the first direction; The constant pressure chamber includes: A first chamber, communicating with the breathing apparatus; A second chamber, communicating with the gas cylinder; The piston assembly includes: An upper piston, located within the first chamber; A lower piston, located within the second chamber; A push rod, connected to both the upper piston and the lower piston respectively; When the piston assembly is at the second position, the lower piston blocks the first chamber from the second chamber, and the gas within the first chamber flows towards the breathing apparatus, reducing the air pressure within the first chamber. As a result, the piston assembly slides along the first direction from the second position to the first position, causing the first chamber to be in communication with the second chamber.

2. The diving constant pressure valve according to claim 1, characterized in that, The piston assembly further includes: A first return spring, along the first direction, the first return spring is located at the end of the upper piston facing away from the lower piston, and one end of the first return spring abuts against the top of the first chamber, while the other end abuts against the upper piston. The acting force direction of the first return spring is the first direction; When the gas within the gas cylinder enters the first chamber, increasing the air pressure within the first chamber, the upper piston overcomes the acting force of the first return spring under the action of the air pressure, causing the piston assembly to slide from the first position to the second position; When the gas within the first chamber flows towards the breathing apparatus, reducing the air pressure within the first chamber, the upper piston overcomes the acting force of the air pressure under the action of the first return spring, causing the piston assembly to slide along the first direction from the second position to the first position, thereby causing the first chamber to be in communication with the second chamber.

3. The constant pressure valve for diving according to claim 2, characterized in that, There is also provided within the second chamber: An abutting member, fixed to the second chamber; The piston assembly further includes: A second return spring, along the first direction, the second return spring is located at the end of the lower piston facing away from the upper piston, and one end of the second return spring abuts against the abutting member, while the other end abuts against the lower piston. The acting force direction of the second return spring is the first direction; When the gas in the gas cylinder enters the first chamber and the air pressure in the first chamber increases, the lower piston is driven by the upper piston to overcome the acting force of the second return spring, so that the piston assembly slides from the first position to the second position; When the gas in the first chamber flows to the breathing apparatus and the air pressure in the first chamber decreases, the lower piston is driven by the upper piston and under the action of the first return spring to overcome the acting force of the air pressure, so that the piston assembly slides from the second position to the first position along the first direction, thereby connecting the first chamber and the second chamber.

4. The diving constant pressure valve according to claim 1, characterized in that, The piston assembly further includes: A connecting member, which is arranged between the first chamber and the second chamber, and the inside of the connecting member is penetrated to connect the first chamber and the second chamber; One end of the connecting member close to the second chamber forms a first opening. When the piston assembly is in the first position, the first opening is separated from the lower piston; when the piston assembly is in the second position, the first opening is in contact with the lower piston, and the lower piston blocks the first opening.

5. The diving constant pressure valve according to claim 4, characterized in that, Along the first direction, one end of the upper piston close to the lower piston is recessed to form a connecting groove; One end of the connecting member close to the first chamber forms a second opening. When the piston assembly is in any position between the first position and the second position, the connecting groove connects the second opening and the breathing apparatus.

6. The diving constant pressure valve according to claim 1, wherein A first through hole penetrating the first chamber along the first direction is formed on the valve body, The diving constant pressure valve further includes: A water isolation film, which is arranged at one end of the valve body, and when observed along the first direction, the water isolation film completely covers the first through hole.

7. The diving constant pressure valve according to claim 1, characterized in that, The diving constant pressure valve further includes: A low-pressure safety valve. A first channel connecting the low-pressure safety valve and the first chamber is formed on the valve body, and a second channel connecting the first channel and the outside is formed on the low-pressure safety valve; The low-pressure safety valve includes: An end cap, A low-pressure safety plug, which is located between the first channel and the second channel, A third return spring, which is located between the end cap and the low-pressure safety plug, and one end of the third return spring abuts against the end cap, and the other end abuts against the low-pressure safety plug, A protrusion is formed at one end of the first channel close to the low-pressure safety plug. The low-pressure safety plug abuts against the protrusion under the action of the third return spring and blocks the second channel; When the air pressure in the first chamber is greater than the safety value, the low-pressure safety plug overcomes the acting force of the third return spring under the action of the air pressure and is separated from the second channel to connect the first channel and the second channel.

8. The diving constant pressure valve according to claim 1, characterized in that, The diving constant pressure valve further includes: A medium-pressure pipe, which connects the first chamber and the breathing apparatus; An air inlet nozzle, which connects the second chamber and the gas cylinder. The air inlet nozzle and the second chamber form a third channel, and the air inlet nozzle and the gas cylinder form a fourth channel.

9. The diving constant pressure valve according to claim 8, characterized in that, The diving constant pressure valve further includes: An air source switch, which is located between the gas cylinder and the air inlet nozzle, and the air source switch blocks or opens the fourth channel; High-pressure safety valve, communicating with the gas cylinder; Pressure gauge, communicating with the gas cylinder.

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