CN114681832A

CN114681832A - Circulating respiratory protection instrument and pre-inflation method for circulating respiratory protection instrument

Info

Publication number: CN114681832A
Application number: CN202011629389.8A
Authority: CN
Inventors: 孙震宇; 郭建树; 胡咏梅
Original assignee: Draeger Safety Equipment China Co ltd
Current assignee: Draeger Safety Equipment China Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2022-07-01

Abstract

The invention discloses a circulating respiratory protection instrument and a pre-inflation method for the same, wherein the circulating respiratory protection instrument comprises: an oxygen cylinder provided with a cylinder valve and containing oxygen; a pressure reducer connected downstream of the oxygen cylinder and configured to reduce a pressure of oxygen from the oxygen cylinder; the automatic air supply device is arranged in the automatic air supply path, is connected with the pressure reducer and is used for supplying oxygen to the breathing loop; and the pre-inflation system is arranged in the pre-inflation path, is connected with the pressure reducer and is used for supplying oxygen to the breathing loop, the automatic gas supply path and the pre-inflation path are arranged in parallel, the pre-inflation system executes a first pre-inflation operation within a preset time after a cylinder valve of the oxygen cylinder is opened, and oxygen flows through the breathing loop through the pre-inflation path so as to discharge original gas in the breathing loop. This application can be when the oxygen cylinder is opened, and the system of charging gas in advance is carried out gas charging to the gas circuit system through the gas charging system in advance to ensure that the oxygen content in the breathing circuit is in the safe state.

Description

Circulating respiratory protection instrument and pre-inflation method for circulating respiratory protection instrument

Technical Field

The application relates to the field of safety rescue equipment, in particular to a circulating respiratory protection instrument with a pre-inflation system and a pre-inflation method for the circulating respiratory protection instrument.

Background

A cyclic respiratory protection apparatus, such as an oxygen respirator, is widely used in rescue tasks such as fire rescue and mine rescue as common rescue equipment.

Conventional oxygen respirators are normally supplied in a metered dose, i.e. at a standard constant flow rate, the most common type of oxygen-metered respirator being used for a period of about 4 hours under standard operating conditions. In practice, however, there are often situations where different oxygen supply amounts are required. For example, if the user is doing heavy physical labor, a greater oxygen demand is required; if the user takes a temporary rest or walks slowly, etc., the demand for oxygen is relatively small.

Therefore, in view of the above situation, there is a need for a novel cyclic respiratory protection apparatus capable of supplying oxygen on demand, which can adjust the oxygen supply amount in real time according to the actual oxygen demand of the user. And since the oxygen concentration in the breathing circuit of the oxygen demand circulation breathing protection apparatus is variable, it is also required to ensure that the oxygen concentration in the breathing circuit is not lower than 21% under any condition, i.e. to maintain the oxygen content under normal air conditions, so as to ensure the use safety and comfort of users.

Disclosure of Invention

The main purpose of the present application is to provide a circulating respiratory protection apparatus and a pre-inflation method for the circulating respiratory protection apparatus, which aim to solve the problems in the prior art that oxygen supply cannot be performed as required and that the oxygen content in a respiratory loop cannot be maintained at not less than 21% during the oxygen supply process.

To achieve the above object, according to one aspect of the present application, there is provided a cyclic respiratory protection apparatus comprising: an oxygen cylinder provided with a cylinder valve and containing oxygen therein; a pressure reducer connected downstream of the oxygen cylinder and configured to reduce a pressure of oxygen from the oxygen cylinder; an automatic gas supply device arranged in the automatic gas supply path and connected with the pressure reducer for supplying oxygen to the breathing circuit; and the pre-inflation system is arranged in the pre-inflation path and connected with the pressure reducer so as to supply oxygen to the breathing circuit, wherein the automatic gas supply path and the pre-inflation path are arranged in parallel between the pressure reducer and the breathing circuit, and the pre-inflation system executes first pre-inflation operation in a preset time after the bottle valve of the oxygen bottle is opened so that oxygen from the oxygen bottle flows through the breathing circuit through the pre-inflation path so as to discharge original gas in the breathing circuit.

The circulating respiratory protection instrument is internally provided with a pre-inflation system which can execute pre-inflation operation at the moment when the oxygen cylinder valve is opened and last for a preset time, so that oxygen in the oxygen cylinder flows through the respiratory loop at a larger air flow, thereby achieving the effects of flushing and removing original gas (including nitrogen) in the respiratory loop; and, in subsequent use, oxygen can be continuously supplied through the automatic gas supply device. This ensures that the oxygen content in the breathing circuit is kept at least 21% in any case, thereby preventing injury or discomfort to the user.

Further, the pre-inflation system comprises: a sensor connected to the oxygen cylinder, the sensor configured to sense opening of the cylinder valve and generate an electrical signal based on the opening of the cylinder valve; a control unit in communication with the sensor and receiving the electrical signal from the sensor; and an electromagnetic valve disposed in the pre-charge path and electrically connected to the control unit, wherein the control unit generates a control signal upon receiving the electrical signal indicating that the cylinder valve is open, and the electromagnetic valve opens in response to the control signal.

The pre-inflation system is realized in an electrical form through a sensor, a control unit and an electromagnetic valve, and the opening and closing of the electromagnetic valve are realized through signal control.

Further, the breathing circuit comprises: CO 2₂An absorption tank; a breathing air bag; a cooling tank; and an end connection path, a first of the end connection pathsTerminal to the CO₂A second end of the terminal connection path is used for connecting with a respiratory system of a user between the absorption tank and the cooling tank, wherein gas exhaled by the user firstly flows through the CO₂The absorption tank gets into after getting rid of carbon dioxide the gasbag, when the user breathes in, gaseous follow gasbag gets into in order to cool off, later get into user's respiratory, thereby realize breathing circuit and user's gas exchange.

Setting CO in the breathing circuit₂The absorption tank can effectively absorb CO in the exhaled air of the user₂And passing the remaining gas (including the remaining oxygen) into the breathing bag, which further supplies oxygen to the user as a result of passing through the CO₂The gaseous temperature is higher behind the absorption tank, for avoiding the user to receive the injury, sets up the cooling tank so that cool off high-temperature gas, later with refrigerated oxygen through end-to-end connection route supply for the user. The breathing circuit is capable of effecting gas exchange efficiently during use.

Further, the circulation respiratory protection instrument still includes air feed end connection path, the first end of air feed end connection path with automatic air feed path with the gas path that dashes in advance is connected, the second end of air feed end connection path is connected CO end connection₂At the input end of the canister.

The automatic gas supply path and the pre-charging gas path are arranged in parallel and are converged in the gas supply end connecting path and further connected to CO together₂The input end of the absorption tank. Due to CO₂The absorption tank is the starting point of the breathing circuit, and the automatic gas supply path is connected with CO₂The input end of the absorption tank can most effectively realize the supply of oxygen, and the pre-charging gas path is connected with CO₂The input end of the absorption tank can realize the flushing of oxygen on the whole breathing loop in the pre-flushing operation, so that the original gas including nitrogen is fully discharged; meanwhile, the automatic air supply path and the pre-flushing air path share the air supply end connection path, so that the pipeline design is simplified, and materials are saved.

Further, the circulation respiratory protection instrument still includes manual air feeder, manual air feeder set up in manual air feed route in order to be used for to breathe the return circuit supply oxygen, manual air feed route with automatic air feed route with the parallel setting in preflush gas route the pressure reducer with breathe between the return circuit, and the first end in manual air feed route with the pressure reducer is connected, the second end in manual air feed route with the air feed end is connected the route and is connected, wherein, manual air feeder is configured to be used for: a) manually actuated in the event of a failure of the pre-insufflation system to perform a second pre-insufflation operation to flow oxygen from the oxygen cylinder through the breathing circuit via the manual gas supply path so as to expel pre-existing gas within the breathing circuit; and/or b) is manually actuated while the automatic gas supply device is operating to perform an oxygen increasing operation to increase the supply of oxygen to the breathing circuit.

The manual air supply device is arranged, so that pre-inflation operation can be performed as an alternative under the condition that the pre-inflation system fails, original air in the breathing circuit is exhausted, and the manual air supply device can also supplement oxygen supply of the automatic air supply device, for example, the manual air supply device can be used for manually supplementing oxygen when a user feels that the oxygen is insufficient, so that more flexible use and wider application range of the circulating breathing protection instrument are realized. In addition, the manual air supply path, the automatic air supply path and the pre-flushing air path are arranged in parallel and share the air supply end connecting path, so that the pipeline design is simplified, and materials are saved.

Further, circulation respiratory protection instrument still includes manual air feeder, manual air feeder set up in manual air feed route in order to be used for to breathe return circuit supply oxygen, the first end in manual air feed route with the decompressor is connected, the second end in manual air feed route is connected the output end department of cooling tank.

The second end of the manual air supply path is arranged at the output end of the cooling tank, so that oxygen can be directly supplied to a user, and the supply of oxygen can be quickly and effectively supplemented.

Further, the solenoid valve is closed after the predetermined time, which is in the range of 5 to 12 seconds.

After the pre-charging operation is completed, the oxygen content in the breathing circuit is not lower than 21%, and then the oxygen content can be maintained to be not lower than 21% through the supply of the automatic air supply device, so that the electromagnetic valve is closed, unnecessary waste can be avoided, and energy can be saved. The duration of the pre-charge operation for 5 to 12 seconds has proven to ensure that adequate venting in the breathing circuit is achieved.

Further, the sensor is a pressure sensor connected to an output end of the oxygen cylinder and generating the electrical signal by sensing a change in air pressure at the output end of the oxygen cylinder.

The pressure sensor is a commonly used sensor type, can quickly sense the opening of the cylinder valve by sensing the air pressure change at the output end of the oxygen cylinder, and correspondingly generates an electric signal.

Further, the electromagnetic valve is electrically connected with the control unit in a wired manner or a wireless manner.

The electromagnetic valve is electrically connected with the control unit in a wired mode or a wireless mode, and a flexible connection mode between the electromagnetic valve and the control unit is realized.

According to another aspect of the present application, there is also provided a pre-inflation method for a cyclic respiratory protection apparatus, the cyclic respiratory protection apparatus being the cyclic respiratory protection apparatus described above, the pre-inflation method comprising the steps of: opening a cylinder valve of an oxygen cylinder of the cyclic respiratory protection apparatus, wherein the oxygen cylinder contains oxygen inside; sensing the opening of the cylinder valve and generating an electrical signal based on the opening of the cylinder valve; generating a control signal based on the received electrical signal; and in response to the control signal, enabling a pre-charging system of the circulating respiratory protection apparatus to execute a first pre-charging operation within a preset time, and enabling oxygen from the oxygen bottle to pass through a respiratory circuit of the circulating respiratory protection apparatus through a pre-charging path so as to exhaust original gas in the respiratory circuit.

Carry out the operation of making a breath in advance to circulation respiratory protection instrument through making a breath in advance the gas system, should make a breath in advance the gas system can carry out the operation of making a breath in advance in the twinkling of an eye that oxygen cylinder valve opened and last a predetermined time in advance, make the oxygen in the oxygen cylinder flow through breathing circuit with great tolerance to reach and erode and remove the effect of original gas (including nitrogen gas) in the breathing circuit, avoid the user to cause the injury or cause the discomfort when using.

By using the technical scheme, the pre-aeration path can be opened in the moment of starting the circulating respiratory protection instrument by using the pre-aeration system, so that oxygen with larger air volume flows through the whole air path system, and the effects of flushing and exhausting other original gases (including nitrogen) in the respiratory loop as far as possible are achieved. And the circulation respiratory protection instrument is also provided with a manual air supply device, so that the pre-inflation function can be realized as an alternative under the condition that the pre-inflation system fails, and the supply of oxygen can be supplemented when the oxygen demand is large.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application, and the description of the exemplary embodiments and illustrations of the application are intended to explain the application and are not intended to limit the application. In the drawings:

fig. 1 shows a schematic view of a cyclic respiratory protection apparatus according to a first embodiment of the present application; and

fig. 2 shows a schematic view of a cyclic respiratory protection apparatus according to a second embodiment of the present application.

Wherein the figures include the following reference numerals:

a cyclic respiratory protection apparatus 1;

the system comprises a pre-inflation system 100, a sensor 10, a control unit 20 and an electromagnetic valve 30;

an oxygen cylinder 40, a pressure reducer 41, a manual air supply device 50 and an automatic air supply device 60;

breathing air bag 70, CO₂An absorption tank 80, a cooling tank 90;

an automatic air supply path 101, a pre-charging air path 102, a manual air supply path 103, an air supply end connecting path 104 and a tail end connecting path 105;

pressure gauge 11

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

According to an aspect of the present application, there is provided a cyclic respiratory protection apparatus comprising: an oxygen cylinder provided with a cylinder valve and containing oxygen therein; a pressure reducer connected downstream of the oxygen cylinder and configured to reduce a pressure of oxygen from the oxygen cylinder; an automatic gas supply device arranged in the automatic gas supply path and connected with the pressure reducer for supplying oxygen to the breathing circuit; and the pre-inflation system is arranged in the pre-inflation path and connected with the pressure reducer so as to supply oxygen to the breathing circuit, wherein the automatic gas supply path and the pre-inflation path are arranged in parallel between the pressure reducer and the breathing circuit, and the pre-inflation system executes first pre-inflation operation in a preset time after the bottle valve of the oxygen bottle is opened so that oxygen from the oxygen bottle flows through the breathing circuit through the pre-inflation path so as to discharge original gas in the breathing circuit.

Fig. 1 shows a schematic view of a cyclic respiratory protection apparatus according to a first embodiment of the present application; and figure 2 shows a schematic view of a cyclic respiratory protection apparatus according to a second embodiment of the present application.

Referring to fig. 1, a cyclic respiratory protection apparatus 1, such as an oxygen respirator, is disclosed according to an embodiment of the present application. The cyclic respiratory protection apparatus includes an oxygen cylinder 40, a pressure reducer 41, an automatic gas supply 60, and a pre-inflation system 100. The oxygen cylinder 40 contains oxygen and is provided with a cylinder valve which can be opened or closed, the pressure reducer 41 is arranged at the downstream of the oxygen cylinder 40 and is connected with the oxygen cylinder, the oxygen cylinder 40 and the pressure reducer 41 are positioned in a high-pressure area, the gas pressure is higher, therefore, in order to avoid the injury to a user caused by the too high oxygen pressure, when the circulating respiratory protection device is operated, the pressure reducer 41 can be used for reducing the gas pressure from the oxygen cylinder 40. An automatic air supply device 60 and a pre-charging system 100 are provided downstream of the pressure reducer 41 and connected to the pressure reducer, respectively, so as to supply oxygen to the breathing circuit, wherein the automatic air supply device 60 is provided in an automatic air supply path 101, and the pre-charging system 100 is provided in a pre-charging path 102, which are provided in parallel between the pressure reducer 41 and the breathing circuit, so that oxygen can be supplied to the breathing circuit independently from each other. In particular, the pre-flush system 100 may perform a first pre-flush operation for a predetermined time after the cylinder valve of the oxygen cylinder 40 is opened, such that oxygen from the oxygen cylinder flows through the breathing circuit via the pre-flush path 102 to exhaust the original gas in the breathing circuit, as will be described in detail below.

With continued reference to fig. 1, the automatic gas supply path 101 and the pre-flush gas path 102 may both open into and meet at a gas supply end connection path 104, where oxygen from the oxygen cylinder 40 may flow through the gas supply end connection path 104 and into the breathing circuit.

This breathing circuit is shown in fig. 1, which may comprise CO₂ An absorption tank 80, a breathing bag 70 and a cooling tank 90, wherein a gas supply side connection path 104 is connectable to the CO₂At the input of the canister 80 to supply oxygen from the oxygen cylinder 40 to the breathing circuit. Furthermore, the breathing circuit has an end connection 105, the first end of which is connected to the CO₂Between the absorption tank 80 and the cooling tank 90, a second end is used for connection to the respiratory system of the user.

The breathing circuit cycles as follows. In use of the cyclic respiratory protection apparatus 1, exhaled gas including carbon dioxide from the user first enters the CO via the terminal connection 105₂An absorption tank 80 (starting point of breathing cycle) where carbon dioxide is absorbed after a chemical reaction, and then the rest of the gas enters the breathing bag 70, which is in an inflated state; when the user inhales, the gas in the resuscitation bag 70 (which is free of carbon dioxide) exits the resuscitation bag and enters the cooling tank 90 as it is in CO₂The chemical reaction that goes on in the absorption tank 80 can be exothermic for the gas temperature that gets into breathing gasbag 70 is higher, therefore when the user breathes in, and the gas that leaves breathing gasbag need cool off in cooling tank 90 the back can be inhaled by the user through end connecting path 105, avoids causing the injury to the user, and breathing gasbag 70 is in the state of lacking gas this moment. The above process is the working process of the breathing circuit and the user for gas exchange.

When the respiratory circuit passesAfter a plurality of gas exchange processes, the oxygen is gradually consumed, the breathing air bag 70 is in a gas shortage state, and the automatic gas supply device 60 can make the oxygen from the oxygen bottle 40 from the CO through the automatic gas supply path 101 and the gas supply end connecting path 104₂The input to the canister enters the breathing circuit and is replenished into the resuscitation bag 70. Oxygen from the oxygen cylinder 40 may also be admitted to the breathing circuit from other locations in the breathing circuit, such as from the breathing bag 70, via the automatic gas supply 60, without departing from the scope of the present application.

With continued reference to fig. 1, there is shown a pre-charging system 100 that includes a sensor 10, a control unit 20, and a solenoid valve 30. The sensor 10 may be coupled to the oxygen cylinder 40 and configured to sense an opening of a cylinder valve of the oxygen cylinder and generate a corresponding electrical signal based thereon. For example, in one non-limiting embodiment, the sensor 10 may be a pressure sensor configured to couple to the output of the oxygen cylinder 40 and sense a change in pressure at the output of the oxygen cylinder when the cylinder valve of the oxygen cylinder is opened, thereby generating an electrical signal indicative of the opening of the cylinder valve. However, it is within the scope of the present application that the sensor 10 may be any suitable type of sensor capable of sensing the cylinder valve opening and oxygen output of an oxygen cylinder. The sensor 10 may communicate with the control unit 20 and transmit the generated electrical signal to the control unit, which in turn the control unit 20 generates a control signal based on the electrical signal. The control unit 20 may further be electrically connected with the solenoid valve 30 in a wired manner (e.g., via a cable) or a wireless manner, and transmit the generated control signal to the solenoid valve 30 to control the solenoid valve 30 to be opened at a large opening. Therefore, at the moment when the cylinder valve of the oxygen cylinder 40 is opened, the electromagnetic valve 30 can be automatically opened electrically, so that the oxygen from the oxygen cylinder rapidly flows through the pre-charging path 102, the gas supply end connecting path 104 and the CO as the starting point of the breathing circuit in sequence at the atmospheric quantity₂The canister 80 enters the breathing circuit so as to flush the whole breathing circuit with oxygen in order to evacuate the original gases present in the breathing circuit, including nitrogen, which makes it possible to bring the oxygen content of the breathing circuit to a level not lower than 21%, and therefore to a level not lower than that of the breathing circuitThe environment in the breathing circuit is equal to the normal air state, and the harm to the user caused by insufficient oxygen is avoided.

The solenoid valve 30 may be automatically closed after being opened for a predetermined time, and then continue to be normally operated by the automatic gas supply device 60 to continuously supply oxygen. Preferably, the predetermined time may be in the range of 5 to 12 seconds, and more preferably, the predetermined time may be 10 seconds.

As shown in fig. 1, the cyclic respiratory protection apparatus 1 may further include a manual gas supply device 50 provided in a manual gas supply path 103 for supplying oxygen to the respiratory circuit, the manual gas supply path may be provided between the pressure reducer 41 and the respiratory circuit in parallel with the automatic gas supply path 101 and the pre-charging path 102, and a first end of the manual gas supply path 103 is connected to the pressure reducer 41 and a second end is connected to a gas supply end connection path 104 so as to be connected to the CO via the gas supply end connection path₂The input end of the absorption tank 80 is connected. The manual air supply path 103, the automatic air supply path 101 and the priming air path 102 are arranged in parallel and connected to the breathing circuit through the same air supply end connection path 104, so that the pipeline design of the air supply system is simplified, and materials are saved.

Wherein the manual gas supply 50 may be arranged to be manually actuated in case of failure of the pre-charging system 100, more specifically of the solenoid valve 30, to perform a second pre-charging operation. Specifically, in the second pre-charging operation, the manual gas supply device 50 may flow oxygen from the oxygen cylinder 40 through the breathing circuit via the manual gas supply path 103 to flush and discharge the original gas in the breathing circuit. Further, the manual gas supply device 50 may be manually actuated while the automatic gas supply device 60 is operated, so as to perform an oxygen increasing operation in a case where the demand of oxygen by the user is large and the supply of the automatic gas supply device cannot satisfy the demand, assisting the automatic gas supply device 60 in increasing the supply of oxygen to the breathing circuit.

Fig. 2 shows a second embodiment of a manual air supply 50. The difference from the first embodiment shown in fig. 1 is that in this second embodiment the first end of the manual air supply path 103, where the manual air supply means 50 is located, is still connected to the pressure reducer 41, while the second end of the manual air supply path is connected at the output end of the cooling tank 90, i.e. the oxygen supplied through the manual air supply path will reach the user's respiratory system more directly, which makes the supply of oxygen more efficient when the manual air supply means 50 is supplementing the supply of the automatic air supply means 60. However, it should be understood that the manual air supply device 50 in this embodiment cannot achieve the pre-inflation function.

In addition, a pressure gauge 11 can be arranged in the circulating respiratory protection instrument 1, so that a user can visually observe the pressure value of the oxygen cylinder.

In particular, the oxygen cylinder 40 and the pressure reducer 41 are in the high pressure region of the air pressure, the automatic air supply 60, the pre-inflation system 100 and the manual air supply 50 are in the medium pressure region of the air pressure, and the breathing circuit is in the low pressure region of the air pressure. The breathing circuit in the low pressure region may provide comfortable use for the user.

In the following, the pre-inflation method for the cyclic respiratory protection apparatus 1 of the present application will be described with reference to fig. 1.

Firstly, opening a cylinder valve of an oxygen cylinder 40 of the circulating respiratory protection apparatus 1; sensing the opening of the cylinder valve by the sensor 10 and generating an electrical signal based on the opening of the cylinder valve; the control unit 20, which is in communication with the sensor 10, may receive the electrical signal and generate a control signal based on the received electrical signal, while transmitting the control signal to the solenoid valve 30 electrically connected to the control unit 20; and in response to the control signal, opening the solenoid valve 30 of the pre-charging system 100, performing a pre-charging operation within a predetermined time period, so that oxygen from the oxygen cylinder 40 flows through the whole breathing circuit of the cyclic respiratory protection device via the pre-charging path 102 in a larger amount, so as to flush the breathing circuit and discharge the original gas in the breathing circuit, thereby making the oxygen content in the breathing circuit not less than 21%, and then maintaining the oxygen content not less than 21% through the normal oxygen supply operation of the automatic oxygen supply device 60.

By the technical scheme, the pre-inflating function of the air path system can be realized through the pre-inflating system while the oxygen cylinder of the circulating respiratory protection instrument is opened, so that the content of oxygen in a respiratory loop is not lower than 21%. And the circular breathing protection instrument is also provided with a manual air supply device, so that the function of pre-inflation can be realized as an alternative under the condition that the pre-inflation system fails, and the supply of oxygen can be supplemented when the oxygen demand is large.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cyclic respiratory protection apparatus, comprising:

an oxygen cylinder (40) provided with a cylinder valve and containing oxygen therein;

a pressure reducer (41) connected downstream of the oxygen cylinder (40) and reducing the pressure of oxygen from the oxygen cylinder;

an automatic gas supply device (60) arranged in the automatic gas supply path (101) and connected with the pressure reducer (41) for supplying oxygen to the breathing circuit; and

a pre-charging system (100) arranged in a pre-charging path (102) and connected with the pressure reducer (41) for supplying oxygen to the breathing circuit,

wherein the automatic gas supply path (101) and the pre-inflation path (102) are arranged in parallel between the pressure reducer (41) and the breathing circuit, and the pre-inflation system (100) executes a first pre-inflation operation within a preset time after the cylinder valve of the oxygen cylinder (40) is opened, so that oxygen from the oxygen cylinder flows through the breathing circuit via the pre-inflation path (102) to discharge original gas in the breathing circuit.

2. A cyclic respiratory protection apparatus according to claim 1, wherein the pre-charge system (100) comprises:

a sensor (10) connected to the oxygen cylinder (40), the sensor (10) being arranged to sense the opening of the cylinder valve and to generate an electrical signal based on the opening of the cylinder valve;

a control unit (20) in communication with the sensor (10) and receiving the electrical signal therefrom; and

a solenoid valve (30) disposed in the pre-charge path (102) and electrically connected with the control unit (20),

wherein the control unit (20) generates a control signal upon receiving the electrical signal indicating that the cylinder valve is open, the solenoid valve (30) opening in response to the control signal.

3. A cyclic respiratory protection apparatus according to claim 1 or claim 2 wherein the breathing circuit comprises:

CO₂an absorption tank (80);

a breathing airbag (70);

a cooling tank (90); and

a terminal connection path (105) having a first end connected to the CO₂An absorption tank (80) and the cooling tank (90), the second end of the terminal connection path is used for connecting with the respiratory system of a user,

wherein the gas exhaled by the user first flows through the CO₂And the absorption tank (80) is used for removing carbon dioxide and then enters the breathing air bag (70), when a user inhales, gas enters the cooling tank (90) from the breathing air bag to be cooled and then enters the respiratory system of the user, so that the gas exchange between the breathing circuit and the user is realized.

4. A cyclic respiratory protection apparatus according to claim 3, wherein the cyclic respiratory protection apparatus (1) further comprises a gas supply end connection path (104), a first end of the gas supply end connection path is connected with the automatic gas supply path (101) and the pre-inflation path (102), and a second end of the gas supply end connection path is connected with the CO₂At the input end of the canister (80).

5. A cyclic respiratory protection apparatus according to claim 4, wherein the cyclic respiratory protection apparatus (1) further comprises a manual gas supply device (50) arranged in a manual gas supply path (103) for supplying oxygen to the breathing circuit, the manual gas supply path being arranged in parallel with the automatic gas supply path (101) and the pre-charging path (102) between the pressure reducer (41) and the breathing circuit, and a first end of the manual gas supply path (103) being connected with the pressure reducer (41) and a second end of the manual gas supply path being connected with the gas supply connection path (104), wherein the manual gas supply device (50) is configured for:

a) is manually actuated in the event of failure of the pre-charging system (100) to perform a second pre-charging operation, causing oxygen from the oxygen cylinder (40) to flow through the breathing circuit via the manual gas supply path (103) so as to vent pre-existing gas within the breathing circuit; and/or

b) Is manually actuated while the automatic gas supply (60) is operating to perform an oxygen increase operation to increase the supply of oxygen to the breathing circuit.

6. A cyclic respiratory protection apparatus according to claim 3 wherein the apparatus (1) further comprises a manual gas supply (50) provided in a manual gas supply path (103) for supplying oxygen to the breathing circuit, a first end of the manual gas supply path being connected to the pressure reducer (41) and a second end of the manual gas supply path being connected at an output of the cooling tank (90).

7. A cyclic respiratory protection apparatus according to claim 2 wherein the solenoid valve (30) is closed after the predetermined time, the predetermined time being in the range of 5 to 12 seconds.

8. A cyclic respiratory protection apparatus according to claim 2, wherein the sensor (10) is a pressure sensor connected to the output of the oxygen cylinder (40) and generating the electrical signal by sensing a change in air pressure at the output of the oxygen cylinder.

9. A cyclic respiratory protection apparatus according to claim 2 wherein the solenoid valve (30) is electrically connected to the control unit (20) by wire or wirelessly.

10. A pre-inflation method for a cyclic respiratory protection apparatus, wherein the cyclic respiratory protection apparatus (1) is a cyclic respiratory protection apparatus according to any one of claims 1 to 9, the pre-inflation method comprising the steps of:

opening a cylinder valve of an oxygen cylinder (40) of the cyclic respiratory protection apparatus (1), wherein the oxygen cylinder contains oxygen inside;

sensing the opening of the cylinder valve and generating an electrical signal based on the opening of the cylinder valve;

generating a control signal based on the received electrical signal; and

in response to the control signal, a pre-charging system (100) of the cyclic respiratory protection apparatus (1) is caused to perform a first pre-charging operation for a predetermined time, and oxygen from the oxygen bottle (40) is caused to pass through a respiratory circuit of the cyclic respiratory protection apparatus via a pre-charging path (102) so as to vent the original gas in the respiratory circuit.