Breathing gas supply device and gas cylinder connection module

Abstract

The utility model relates to the field of ventilation treatment equipment, and discloses breathing gas supply equipment and a gas cylinder connecting module, and the breathing gas supply equipment comprises the gas cylinder connecting module (1) and a plurality of gas cylinders (2) connected to the gas cylinder connecting module. The gas cylinder connecting module is provided with a main gas channel (11) used for conveying breathing gas to a user and branch gas channels (12) correspondingly connected between the gas cylinder connecting ports and the main gas channel. The gas cylinders can supply breathing gas to the main gas channel through the branch gas channels, gas outlets of the gas cylinders (2) are provided with gas flow control units, and the gas flow control units are arranged to limit the gas outlet flow of the gas cylinders when the gas cylinders have preset gas pressure at least before the corresponding gas cylinders are connected to the preset positions of the gas cylinder connecting openings. According to the breathing gas supply equipment, the gas outlet flow and pressure can be limited in the process that the gas cylinder is connected to the public gas path, so that the gas cylinder is effectively prevented from being bounced off, and the breathing gas supply equipment has high use safety.

Description

Technical Field

[0001] The utility model relates to a ventilation treatment device, in particular to a breathing gas supply device. In addition, the utility model also relates to a gas cylinder connection module that can be used for the breathing gas supply device. Background Art

[0002] An oxygen respirator is a device that stores oxygen and supplies oxygen to the human body through the oxygen output device of the cylinder itself when the user needs to inhale oxygen. For example, in scenarios such as home convalescence, medical care, or for people who have or may have altitude sickness in high-altitude areas, it is often necessary to supply oxygen to the human body additionally for ventilation treatment or to relieve the impact of high-altitude hypoxia on the human body. Since the oxygen respirator has the advantages of small size, convenient to carry, and can be refilled with oxygen after use, it is widely used for travel to facilitate timely human convalescence. The oxygen respirator can also be used as a convenient breathing tool for travelers, people undergoing oxygen therapy, or people in high-altitude areas.

[0003] Due to the small size of the portable oxygen respirator, its capacity is limited and cannot meet the needs of long-term oxygen inhalation or oxygen use by multiple people. In this regard, the cylinders of multiple portable oxygen respirators can be connected to each other to achieve capacity expansion. Thus, oxygen can be supplied by a single portable oxygen respirator monomer, or the oxygen capacity can be increased by connecting and expanding the multi-cylinder connection to meet the needs of multiple people for oxygen inhalation, long-term oxygen supply, or multiple people inhaling oxygen simultaneously.

[0004] Currently, the common gas path for connecting multiple cylinders to the cylinder is connected by an extension pipe or a quick connector. After connection, the formed integrated unit merges the gas into the main airway in the common gas path and then supplies it to the user. However, this confluence method can only achieve the effect of capacity expansion and has many defects in actual use: on the one hand, when the remaining gas volume in one of the gas cylinders is insufficient, or when the pressure in one gas cylinder is significantly higher than that of other gas cylinders, the air pressure in the main airway may be higher than the air pressure in some gas cylinders, which will cause the gas to flow back to the gas cylinders with low pressure, affecting the gas supply of the common gas path; on the other hand, when connecting the gas cylinder to the common gas path, the high-pressure gas instantaneously sprays out from the gas outlet of the cylinder body, which is likely to cause the cylinder body to bounce off, with a relatively high safety risk. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the problem that the cylinder body is easily bounced off during the process of connecting the gas cylinder to the common gas path in the prior art, with a relatively high safety risk, and provide a breathing gas supply device that can effectively prevent the gas cylinder from bouncing off the common gas path and has high use safety.

[0006] To achieve the above purpose, on the one hand, the utility model provides a breathing gas supply device, including:

[0007] A gas cylinder connection module, which has a plurality of gas cylinder connection ports, a main airway for delivering breathing gas to a user, and branch airways respectively corresponding to and connecting between each of the gas cylinder connection ports and the main airway;

[0008] A plurality of gas cylinders, the bottle mouths of which are connected to the gas cylinder connection ports so as to be able to supply breathing gas to the main airway through the branch airways,

[0009] Wherein, an air flow control unit is provided at the gas outlet of the gas cylinder, and the air flow control unit is configured to define the gas outlet flow rate of the gas cylinder at a predetermined air pressure at least before a predetermined position where the corresponding gas cylinder is connected to the gas cylinder connection port.

[0010] Preferably, the air flow control unit includes a throttle orifice provided at the gas outlet of the gas cylinder, so as to define the gas outlet flow rate from the gas cylinder to the main airway of the corresponding gas cylinder at a predetermined air pressure through the throttle orifice.

[0011] Preferably, the throttle orifice is set such that when the air pressure in the gas cylinder is 2 atmospheres, the gas outlet flow rate of the gas cylinder does not exceed 10 L / min. In particular, when the air pressure in the gas cylinder is 2 atmospheres, the gas outlet flow rate of the gas cylinder can be 5 L / min.

[0012] Preferably, the bottle mouth of the gas cylinder and the gas cylinder connection port are formed as one body.

[0013] Preferably, the bottle mouth of the gas cylinder is detachably connected to the gas cylinder connection port, and the air flow control unit includes a gas cylinder check valve provided at the gas outlet of the gas cylinder. The gas cylinder check valve is configured to remain closed during the process of connecting the gas cylinder to the gas cylinder connection port and open until the gas cylinder is connected to a predetermined position.

[0014] Preferably, an internal thread is formed at the gas cylinder connection port, an external thread for screwing to the internal thread is provided at the bottle mouth of the gas cylinder, and the gas cylinder check valve is configured to remain closed during the process of screwing the bottle mouth of the gas cylinder to the gas cylinder connection port until a predetermined number of screwing turns is reached.

[0015] Preferably, the gas cylinder check valve includes a valve body formed with the gas outlet, a valve stem extending into the valve body and capable of moving between an open position and a closed position, and a return spring elastically abutted against the valve stem. The return spring causes the valve stem to tend to remain in the closed position; a push rod is provided at one end of the branch airway facing the gas cylinder connection port. During the process of connecting the gas cylinder to the gas cylinder connection port, the push rod pushes the valve stem towards the open position against the elastic force of the return spring.

[0016] Preferably, a tapered orifice portion that tapers in a direction away from the return spring is formed in the inner cavity of the valve body, and a sealing ring for sealingly cooperating with the tapered orifice portion is provided on the valve stem.

[0017] Preferably, a one-way valve disc is sleeved on the ejector rod and is located in the branch air passage and is configured to only allow air flow to flow from the corresponding gas cylinder to the main air passage.

[0018] Preferably, a gasket surrounding the inlet of the branch air passage is provided in the gas cylinder connection port. In a state where the gas cylinder is connected to the gas cylinder connection port, the bottle mouth of the gas cylinder is sealingly abutted against the gasket.

[0019] Preferably, an air passage one-way valve is provided in the branch air passage, and the air passage one-way valve is configured to only allow air flow to flow from the corresponding gas cylinder to the main air passage.

[0020] Preferably, a flow control valve is provided on the branch air passage, and the flow control valve can be adjusted to switch the on-off state of the branch air passage and adjust the gas flow rate from the corresponding gas cylinder to the main air passage.

[0021] Preferably, the volume of a single gas cylinder is less than or equal to 1 L.

[0022] A second aspect of the present utility model provides a gas cylinder connection module, which has a plurality of gas cylinder connection ports, a main air passage for delivering breathing gas to a user, and branch air passages respectively corresponding to and connected between each of the gas cylinder connection ports and the main air passage. An internal thread for connecting a gas cylinder is formed at the gas cylinder connection port, and an ejector rod for opening a gas cylinder one-way valve at the gas outlet of the gas cylinder when the gas cylinder is connected to a predetermined position is provided at one end of the branch air passage facing the gas cylinder connection port.

[0023] Through the above technical solutions, the gases stored in the multiple gas cylinders connected to the gas cylinder connection ports can respectively converge into the main air passage through the corresponding branch air passages for the user to use. Thus, the whole can have a relatively large gas capacity, which is convenient for meeting the needs of multiple people for oxygen inhalation, long-term oxygen supply, or multiple people inhaling oxygen simultaneously. By providing an air flow control unit at the gas outlet of the gas cylinder, the gas outlet flow rate of the gas cylinder at a predetermined air pressure can be limited before the gas cylinder is connected to the predetermined position of the gas cylinder connection port. Thereby, the gas outlet flow rate and pressure can be restricted during the process of connecting the gas cylinder to the common air path (especially for gas cylinders that can be detached from the gas cylinder connection module), effectively preventing the gas cylinder from being bounced off, and thus having relatively high use safety.

[0024] In some preferred embodiments of the present utility model, when the remaining gas volume in a certain gas cylinder is insufficient, or when the pressure in a certain gas cylinder is significantly higher than that of other gas cylinders, the on-off control unit can prevent the gas in the main airway from flowing back to the low-pressure gas cylinder by cutting off the communication flow path between the low-pressure gas cylinder and the main airway, so that the gas supply from other gas cylinders to the main airway and the user will not be affected. Description of the Drawings

[0025] Figure 1 is a cross-sectional view of a breathing gas supply device according to a preferred embodiment of the present utility model;

[0026] Figure 2 is Figure 1 an enlarged view of the partial area A in

[0027] Figure 3 is a view showing Figure 1 the breathing gas supply device in

[0028] Figure 4 is Figure 3 an enlarged view of the partial area B in

[0029] Figure 5 is a cross-sectional view of a breathing gas supply device according to another preferred embodiment of the present utility model;

[0030] Figure 6 is a cross-sectional view of a breathing gas supply device according to still another preferred embodiment of the present utility model.

[0031] Description of the Reference Numerals

[0032] 1 - Gas cylinder connection module; 11 - Main airway; 12 - Branch airway; 13 - Flow control valve; 14 - Sealing gasket; 15 - Internal thread; 16 - Thumb rod; 17 - Check valve disc;

[0033] 2 - Gas cylinder; 21 - Throttle hole; 22 - Gas cylinder check valve; 221 - Valve body; 221a - Tapered orifice part; 222 - Valve rod; 223 - Return spring; 224 - Sealing ring; 23 - External thread. Detailed Description of the Embodiments

[0034] The following provides a detailed description of the specific embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not intended to limit the present utility model.

[0035] Refer to Figures 1 to 4As shown, a breathing gas supply device according to a preferred embodiment of the present utility model includes a gas cylinder connection module 1 and a plurality of gas cylinders 2 connected thereto. The gas cylinder 2 can be, for example, an oxygen cylinder storing oxygen or other breathing gases. The gas cylinder 2 involved in this solution is mainly a container for storing gas, so it should not be limited to only gas cylinders. For example, it can be a plurality of independently arranged cavities opened in the gas cylinder connection module 1, as long as it can meet the gas storage function, no further limitation will be made here. And since each gas cylinder 2 is independently arranged, when there is no gas or a gas supply problem in a certain gas cylinder 2, the other independently arranged gas cylinders 2 can all achieve supplementary gas supply, so as to meet more usage scenarios of users and the usage requirements of large-capacity gas supply, and it has high safety.

[0036] Preferably, the volume (volume) of a single gas cylinder 2 or cavity is set to not exceed 1 L, and three to four of them can be continuously arranged. In this way, not only can the portable carrying requirement be achieved, but also large-capacity gas storage can be realized. When a single gas cylinder 2 fails, it will not affect the use of other gas cylinders of the device, and it has high safety.

[0037] Among them, the gas cylinder connection module 1 has a plurality of gas cylinder connection ports, and the gas cylinder 2 can be connected to the gas cylinder connection module 1 through these gas cylinder connection ports. The gas cylinder connection module 1 also has a main airway 11 for delivering breathing gas to the user and branch airways 12 respectively corresponding to be connected between each gas cylinder connection port and the main airway 11. The breathing gas stored in each gas cylinder 2 can be supplied to the main airway 11 through the corresponding branch airway 12, so that the user can obtain breathing gas through the main airway 11. For this reason, the gas cylinder connection module 1 can be provided with a gas supply joint (not shown) for connecting the main airway 11 to the user interface (such as through a breathing pipeline). Thus, the gases stored in the plurality of gas cylinders 2 connected to the gas cylinder connection ports can be respectively converged into the main airway 11 through the corresponding branch airways 12 for the user to use. Therefore, this breathing gas supply device can have a relatively large gas capacity, which is convenient to meet the needs of multiple people for oxygen inhalation, long-term oxygen supply, or multiple people inhaling oxygen simultaneously.

[0038] In this breathing gas supply device, an air flow control unit is provided at the air outlet of the gas cylinder 2. The air flow control unit is set to limit the air outlet flow rate of the gas cylinder 2 when it has a predetermined air pressure at least before the corresponding gas cylinder 2 is connected to the predetermined position of the gas cylinder connection port. Thus, during the process of connecting the gas cylinder to the common gas path, the air flow control unit can limit the air outlet flow rate and pressure of the gas cylinder, thereby effectively preventing the gas cylinder from being bounced off, and thus having high usage safety. The air flow control unit described here can be, for example, Figures 1 to 4 or Figure 6 the gas cylinder one-way valve 22 shown in Figure 5 or Figure 6The throttle orifice 21 shown in [figure number] will be described in detail later. The common gas path is a gas path disposed inside the gas cylinder connection module and communicable with a plurality of gas cylinder connection ports. The above-mentioned main air duct 11, branch air duct 12, etc. all belong to the common gas path.

[0039] In addition, an on-off control unit capable of preventing the air flow from flowing from the main air duct 11 to the corresponding gas cylinder 2 may be provided on the branch air duct 12 and / or at the air outlet of the gas cylinder 2. For example, the on-off control unit may be an air duct check valve disposed in the branch air duct 12 and / or a flow control valve 13 disposed on the branch air duct 12, etc., which will be described in detail later. Thus, when the remaining gas volume in a certain gas cylinder 2 is insufficient, or when the pressure in a certain gas cylinder 2 is significantly higher than the pressure in other gas cylinders 2, the on-off control unit can prevent the gas in the main air duct 11 from flowing back to the low-pressure gas cylinder by cutting off the communication flow path between the low-pressure gas cylinder and the main air duct 11, so that it will not affect the gas supply from other gas cylinders to the main air duct and the user.

[0040] In Figures 1 to 4 In the preferred embodiment shown in [figure number], the on-off control unit includes an air duct check valve disposed in the branch air duct 12. The air duct check valve is configured to only allow the air flow to flow from the corresponding gas cylinder 2 to the main air duct 11, and prevent the gas in the main air duct 11 from flowing back to the gas cylinder 2. With this setting, regardless of the remaining gas volume in the gas cylinder 2 or whether its internal pressure is lower than the internal pressure of the main air duct 11, the gas in the main air duct 11 can be automatically prevented from flowing back to the gas cylinder 2 without manual operation, which has high reliability. The air duct check valve can be configured in a variety of suitable structural forms. In the illustrated preferred embodiment, the air duct check valve is configured as a check valve disc 17 located in the branch air duct 12. The check valve disc 17 tends to close the communication path between the branch air duct 12 and the corresponding gas cylinder 2 under the action of the air pressure in the branch air duct 12, and can only be opened when the pressure in the gas cylinder 2 is higher than the air pressure in the branch air duct 12. More specifically, the check valve disc 17 can be sleeved on the ejector rod 16 used to open the gas cylinder check valve 22 during the process of connecting the gas cylinder 2, as Figure 4 shown in [figure number].

[0041] Continuing to refer to Figures 1 to 4As shown, the breathing gas supply device of this preferred embodiment further includes a flow control valve 13 that can serve as the above-mentioned on-off control unit. The flow control valve 13 is provided on the branch airway 12 and can be adjusted to switch the on-off state of the branch airway 12 and adjust the gas flow from the corresponding gas cylinder 2 to the main airway 11. Thus, when the remaining gas volume in a certain gas cylinder 2 is insufficient (for example, a pressure indicating element can be provided on the gas cylinder to determine its remaining gas volume or pressure), the flow control valve 13 on its corresponding branch airway 12 can be manipulated to switch it to the position where the branch airway 12 is cut off, so as to prevent the gas in the main airway 11 from flowing back to the low-pressure gas cylinder 2. In this case, the above-mentioned airway check valve can be omitted, and the gas backflow can be prevented by manual manipulation. At the same time, the flow control valve 13 can be used to adjust the gas flow from the corresponding gas cylinder 2 to the main airway 11, which can be used to control the output flow of the main airway 11, facilitating the user to adjust according to the remaining gas volume and gas volume demand.

[0042] The flow control valve 13 can be arranged in a variety of suitable structural forms. In the illustrated preferred embodiment, the flow control valve 13 has a valve stem rotatably connected to the module body. The valve stem has a throttling opening. When the valve stem is rotated to different positions, the throttling opening can communicate with or cut off the branch airway 12, or has throttling openings of different sizes, so as to switch the on-off state of the branch airway 12 or adjust the gas flow from the corresponding gas cylinder 2 to the main airway 11. As Figure 1 and Figure 2 shown, when the gas volume in the gas cylinder 2 on the right side of the illustration is insufficient, or as Figure 3 and Figure 4 shown, when disassembling and assembling the gas cylinder 2 on the right side of the illustration, or in other situations where the connection between the main airway 11 and the gas cylinder 2 needs to be cut off, the valve stem of the flow control valve 13 on the branch airway 12 corresponding to the gas cylinder 2 can be rotated so that its throttling opening is cut off from the branch airway 12, thus avoiding the influence on the gas supply in the main airway 11. By adjusting the size of the throttling opening, it is convenient to freely switch different gas supply modes and control the gas supply flow.

[0043] As mentioned above, during the process of connecting the gas cylinder 2 to the common gas path such as the gas cylinder connection module 1, the high-pressure gas instantaneously sprays out from the gas outlet of the cylinder body, which is likely to cause the cylinder body to bounce off, with a relatively high safety risk. Therefore, in Figures 1 to 4In the preferred embodiment shown, the mouth of the gas cylinder 2 is detachably connected to the gas cylinder connection port, and a gas cylinder check valve 22 is provided at the gas outlet of the gas cylinder 2. The gas cylinder check valve 22 is configured to remain closed during the process of connecting the gas cylinder 2 to the gas cylinder connection port and to open until the gas cylinder 2 is connected to a predetermined position. Thus, in a state where the gas cylinder 2 and the gas cylinder connection port of the gas cylinder connection module 1 are not fully connected, the gas cylinder check valve 22 remains closed, that is, the gas cylinder check valve 22, as the aforementioned gas flow control valve, limits the gas outlet flow rate of the gas cylinder 2 to 0; when the gas cylinder 2 is connected to a predetermined position, the gas cylinder check valve 22 is opened to supply breathing gas to the branch airway 12 of the gas cylinder connection module 1. Through this setting, it is possible to avoid the gas cylinder from bouncing off due to the instantaneous ejection of high-pressure gas from the gas outlet during the process of connecting the gas cylinder 2 to the gas cylinder connection module 1, effectively improving the use safety of the breathing gas supply device. In addition, by providing the gas cylinder check valve 22 at the gas outlet of the gas cylinder 2, the gas cylinder 2 itself can be sealed, and when necessary, the gas cylinder 2 can be quickly depressurized by opening the gas cylinder check valve 22.

[0044] Typically, the gas cylinder 2 can be connected to the gas cylinder connection port of the gas cylinder connection module 1 by a threaded connection. For this purpose, an internal thread 15 can be formed at the gas cylinder connection port, and an external thread 23 for screwing into the internal thread 15 is provided at the mouth of the gas cylinder 2. The gas cylinder check valve 22 is configured to remain closed during the process of screwing the mouth of the gas cylinder 2 onto the gas cylinder connection port until a predetermined number of screwing turns is reached. Thus, setting the opening timing of the gas cylinder check valve 22 based on the number of screwing turns between the gas cylinder 2 and the gas cylinder connection port can effectively ensure that the connection relationship established between the gas cylinder 2 and the gas cylinder connection port when the gas cylinder check valve 22 is opened can prevent the gas cylinder from bouncing off. In other embodiments, the gas cylinder 2 can also be configured to be connected to the gas cylinder connection module 1 by other means such as snap connection.

[0045] The gas cylinder check valve 22 can also be configured in a variety of suitable structural forms. In Figures 1 to 4In the preferred embodiment shown, the gas cylinder check valve 22 includes a valve body 221 formed with an air outlet, a valve stem 222 extending into the valve body 221 and capable of moving between an open position and a closed position, and a return spring 223 elastically abutted against the valve stem 222. The return spring 223 causes the valve stem 222 to tend to remain in the closed position, thereby keeping the gas cylinder 2 itself sealed when not connected or not connected to a predetermined position. In contrast, a push rod 16 is provided at one end of the branch air passage 12 facing the gas cylinder connection port. During the process of connecting the gas cylinder 2 to the gas cylinder connection port, the push rod 16 pushes the valve stem 222 towards the open position against the elastic force of the return spring 223, so that the gas cylinder check valve 22 is opened. Thus, through the above-mentioned threaded connection relationship and the relative arrangement relationship between the push rod 16 and the valve stem 222, the sequence of threaded insertion and the opening of the gas cylinder check valve 22 can be effectively controlled, thereby avoiding the gas cylinder being bounced off at the moment when the air outlet is opened during the gas cylinder connection process, effectively protecting the operator and users from harm, and making the connection safer, more reliable and more user-friendly. In an alternative embodiment, the gas cylinder check valve 22 can also be arranged in a structure similar to the check valve piece 17, so as to be opened by means of pushing by the push rod 16 and closed in the natural state.

[0046] Further, in order to ensure the sealing performance, in the above-mentioned gas cylinder check valve 22, a tapered port portion 221a that tapers in a direction away from the return spring 223 can be formed in the inner cavity of the valve body 221, and a sealing ring 224 for sealing cooperation with the tapered port portion 221a can be provided on the valve stem 222, so as to seal and fit the inner wall of the valve body 221 with the sealing ring 224 when the valve stem 222 is not pushed, thereby avoiding the leakage of the gas in the gas cylinder.

[0047] In addition, a sealing gasket 14 can be provided in the gas cylinder connection port around the entrance of the branch air passage 12. In the state where the gas cylinder 2 is connected to the gas cylinder connection port, the valve body 221 is sealed and abutted against the sealing gasket 14 to establish a sealed communication relationship between the gas cylinder 2 and the branch air passage 12, avoiding the escape of the breathing gas at the connection position.

[0048] Figure 5 A breathing gas supply device according to another preferred embodiment of the present invention is provided. The breathing gas supply device is combined with the above Figures 1 to 4Compared with the described preferred embodiment, the flow control valve provided on the branch airway 12 and the cylinder one-way valve at the air outlet of the cylinder 2 are omitted, and each cylinder 2 is fixedly connected to the cylinder connection module 1. Through this setting, the production cost can be saved and the structural complexity can be reduced compared with the above preferred embodiment. At the same time, the airway one-way valve for preventing the gas in the main airway 11 from flowing back to the cylinder 2 can also be omitted, so that the inflation device connected to the cylinder connection module 1 can be used to inflate the cylinder with a lower air pressure. In this breathing gas supply device, a throttle hole 21 is provided at the air outlet of the cylinder 2 to limit the gas flow rate from the cylinder 2 to the main airway 11 when the corresponding cylinder 2 has a predetermined air pressure through the throttle hole 21. For example, when the air pressure in the cylinder 2 is 2 atmospheres, the air outlet flow rate of the cylinder 2 does not exceed 10 L / min. Preferably, when the air pressure in the cylinder 2 is 2 atmospheres, the air outlet flow rate of the cylinder 2 is 5 L / min. In addition, the gasket 14 and the like in the breathing gas supply device of this preferred embodiment are basically the same as those in the above combination Figures 1 to 4 described preferred embodiment and will not be elaborated here.

[0049] Figure 6 A breathing gas supply device according to another preferred embodiment of the present invention is provided. This breathing gas supply device is generally the same as the above combination Figures 1 to 4 described preferred embodiment, and has the same cylinder one-way valve 22, ejector rod 16, threaded connection structure (internal thread 15 at the cylinder connection port and external thread 23 at the cylinder mouth), airway one-way valve (one-way valve piece 17), gasket 14, etc., and will not be elaborated here. This breathing gas supply device omits the flow control valve provided on the branch airway 12, and a throttle hole 21 is provided at the air outlet of the cylinder 2 to limit the gas flow rate from the cylinder 2 to the main airway 11 when the corresponding cylinder 2 has a predetermined air pressure through the throttle hole 21. For example, when the air pressure in the cylinder 2 is 2 atmospheres, the air outlet flow rate of the cylinder 2 does not exceed 10 L / min. Preferably, when the air pressure in the cylinder 2 is 2 atmospheres, the air outlet flow rate of the cylinder 2 is 5 L / min.

[0050] The present invention also provides a cylinder connection module 1 that can be used in the above breathing gas supply device. The cylinder connection module 1 has a plurality of cylinder connection ports, a main airway 11 for delivering breathing gas to the user, and branch airways 12 respectively corresponding to and connected between each cylinder connection port and the main airway 11. As Figures 1 to 4 and Figure 6As shown, an internal thread 15 for connecting a gas cylinder 2 is formed at the gas cylinder connection port, and a push rod 16 for opening a gas cylinder one-way valve 22 at the gas outlet of the gas cylinder 2 when the gas cylinder 2 is connected to a predetermined position is provided at one end of the branch air passage 12 facing the gas cylinder connection port. In addition, the gas cylinder connection module 1 may further have an air passage one-way valve, a flow control valve, etc., and it has the same technical advantages as the above-mentioned breathing gas supply device, which will not be repeated here.

[0051] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solutions of the present invention, including any suitable combination of each specific technical feature. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods. But these simple modifications and combinations should also be regarded as the content disclosed by the present invention and all fall within the protection scope of the present invention.

Claims

1. A breathing gas supply device, characterized in that include: A gas cylinder connection module (1), the gas cylinder connection module (1) comprising a plurality of gas cylinder connection ports, a main airway (11) for delivering breathing gas to a user, and branch airways (12) respectively connected to each of the gas cylinder connection ports and the main airway (11); a plurality of gas cylinders (2), wherein the cylinder ports of the gas cylinders (2) are connected to the gas cylinder connection port so as to be able to supply breathing gas to the main airway (11) through the branch airway (12), Wherein, an air flow control unit is provided at the air outlet of the gas cylinder (2), and the air flow control unit is configured to limit the air outlet flow rate of the gas cylinder (2) when it has a predetermined air pressure at least before the corresponding gas cylinder (2) is connected to a predetermined position of the gas cylinder connection port.

2. The breathing gas supply device according to claim 1, characterized in that The air flow control unit comprises a throttle hole (21) arranged at the air outlet of the gas cylinder (2), so as to limit the air outlet flow rate of the corresponding gas cylinder (2) from the gas cylinder (2) to the main air channel (11) through the throttle hole (21) when the gas cylinder (2) has a predetermined air pressure.

3. The breathing gas supply device according to claim 2, characterized in that The throttle hole (21) is configured such that when the gas pressure in the gas cylinder (2) is 2 atmospheres, the gas outlet flow rate of the gas cylinder (2) does not exceed 10 L / min.

4. The breathing gas supply device according to claim 3, characterized in that When the gas pressure in the gas cylinder (2) is 2 atmospheres, the gas outlet flow rate of the gas cylinder (2) is 5 L / min.

5. The breathing gas supply device according to claim 2, characterized in that The bottle mouth of the gas cylinder (2) and the gas cylinder connecting port are formed as one piece.

6. The breathing gas supply device according to claim 1, characterized in that The mouth of the gas cylinder (2) is detachably connected to the gas cylinder connection port, and the airflow control unit comprises a gas cylinder one-way valve (22) arranged at the gas outlet of the gas cylinder (2), and the gas cylinder one-way valve (22) is arranged to remain closed during the process of connecting the gas cylinder (2) to the gas cylinder connection port until the gas cylinder (2) is connected to a predetermined position and then opened.

7. The breathing gas supply device according to claim 6, characterized in that An internal thread (15) is formed at the gas cylinder connection port, and the mouth of the gas cylinder (2) is provided with an external thread (23) for being screwed to the internal thread (15), and the gas cylinder one-way valve (22) is arranged to remain closed during the process of screwing the mouth of the gas cylinder (2) to the gas cylinder connection port until a predetermined number of screwing turns is reached.

8. The breathing gas supply device according to claim 6, characterized in that The gas cylinder one-way valve (22) comprises a valve body (221) formed with the gas outlet, a valve stem (222) extending into the valve body (221) and capable of moving between an open position and a closed position, and a return spring (223) elastically abutting against the valve stem (222), wherein the return spring (223) causes the valve stem (222) to tend to remain in the closed position; a push rod (16) is provided at one end of the branch gas channel (12) facing the gas cylinder connection port, and during the process of connecting the gas cylinder (2) to the gas cylinder connection port, the push rod (16) overcomes the elastic force of the return spring (223) and pushes the valve stem (222) toward the open position.

9. The breathing gas supply device according to claim 8, characterized in that A tapered mouth portion (221a) which gradually contracts in a direction away from the return spring (223) is formed in the inner cavity of the valve body (221), and a sealing ring (224) for sealingly cooperating with the tapered mouth portion (221a) is provided on the valve stem (222).

10. The breathing gas supply device according to claim 8, characterized in that The push rod (16) is sleeved with a one-way valve sheet (17) located in the branch airway (12) and configured to only allow airflow from the corresponding gas cylinder (2) to flow to the main airway (11).

11. The breathing gas supply device according to claim 1, characterized in that A sealing gasket (14) is arranged around the entrance of the branch airway (12) in the gas cylinder connection port. When the gas cylinder (2) is connected to the gas cylinder connection port, the mouth of the gas cylinder (2) is sealed against the sealing gasket (14).

12. The breathing gas supply device according to claim 1, characterized in that An airway one-way valve is provided in the branch airway (12), and the airway one-way valve is configured to only allow airflow from the corresponding gas cylinder (2) to flow to the main airway (11).

13. The breathing gas supply device according to claim 1, characterized in that The branch airway (12) is provided with a flow control valve (13), and the flow control valve (13) can be adjusted to switch the on and off state of the branch airway (12) and adjust the gas flow from the corresponding gas cylinder (2) to the main airway (11).

14. The breathing gas supply device according to claim 1, characterized in that The volume of a single gas cylinder (2) is less than or equal to 1L.

15. A gas cylinder connection module (1), characterized in that: The gas cylinder connection module (1) comprises a plurality of gas cylinder connection ports, a main air channel (11) for delivering breathing gas to a user, and branch air channels (12) respectively connected to each of the gas cylinder connection ports and the main air channel (11), wherein an internal thread (15) for connecting a gas cylinder (2) is formed at the gas cylinder connection port, and a push rod (16) is provided at one end of the branch air channel (12) facing the gas cylinder connection port for opening a gas cylinder one-way valve (22) at the gas outlet of the gas cylinder (2) when the gas cylinder (2) is connected to a predetermined position.

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