Gas circuit assembly and breathing machine

Abstract

The utility model relates to an air path assembly and a breathing machine, the air path assembly is used for fluid conveying of the breathing machine, the air path assembly comprises a base and an airflow introducer, the base is provided with an air outlet path, a first air inlet path and a second air inlet path, the first air inlet path and the second air inlet path are communicated with the air outlet path, and the first air inlet path is used for being communicated with an air source; and the airflow introducer communicates with the second air inlet path and is further used for communicating with the external environment so as to introduce external air into the second air inlet path. Gas in the gas source can be introduced into the gas path assembly through the first gas inlet path and conveyed to a breathing machine user through the gas outlet path. Meanwhile, the airflow introducer can introduce the external air into the second air inlet path, and when no air source provides air, the airflow introducer can guide the external air to flow into the air outlet path through the second air inlet path so as to be conveyed to the respirator user, so that the air path assembly has two different air supply modes. The breathing machine comprises the gas circuit assembly, and due to the fact that the breathing machine has two gas supply modes, the breathing machine can be suitable for various scenes.

Description

Technical Field

[0001] The present application relates to the technical field of ventilators, and in particular to an air circuit assembly and a ventilator. Background Art

[0002] A ventilator is a medical device that can assist or replace the user's spontaneous ventilation. It is currently commonly used in scenarios such as respiratory failure, anesthesia respiratory management during major surgery, respiratory support therapy, and emergency resuscitation.

[0003] In traditional technology, ventilators usually use gas sources to supply air to users through high-pressure gas provided by high-pressure gas sources. However, in this gas supply method, the ventilator relies on the gas supplied by the high-pressure gas source and is not suitable for other complex scenarios (such as outdoor scenarios). Utility Model Content

[0004] Based on this, it is necessary to provide an air circuit assembly and a ventilator to address the problem that the current ventilator uses an air source to supply air, which makes the ventilator's usage scenario single.

[0005] An air circuit assembly, the air circuit assembly is used for fluid delivery of a ventilator, the air circuit assembly comprises:

[0006] A base, wherein the base is provided with an air outlet, and a first air inlet and a second air inlet respectively connected to the air outlet, wherein the first air inlet is used to connect to an air source;

[0007] An airflow introducer is connected to the second air inlet path, and is also used to communicate with the external environment to introduce external air into the second air inlet path.

[0008] In one embodiment, the gas circuit assembly further includes a stop valve, which is disposed on a base. When the stop valve is opened, the second gas inlet circuit is connected to the gas outlet circuit. When the stop valve is closed, the second gas inlet circuit is disconnected from the gas outlet circuit.

[0009] In one embodiment, the base includes a connecting piece, the connecting piece is provided with a connecting cavity, the connecting cavity includes a mixing cavity, a control cavity and a connecting port connecting the mixing cavity and the control cavity, the second air inlet path is connected to the control cavity, the air outlet path is connected to the mixing cavity, and a partial structure of the stop valve passes through the control cavity to open or block the connecting port.

[0010] In one embodiment, the connecting member has a first opening and a second opening, the first opening connects the control chamber with the second air inlet path, and the second opening connects the mixing chamber with the air outlet path; the stop valve includes a valve body and a blocking member, and the blocking member is movably arranged through the control chamber to open or block the connecting port.

[0011] In one embodiment, the base includes an oxygen pipe, which is connected to the connecting piece and is used to communicate with an oxygen source; the first air inlet path includes an oxygen branch formed in the oxygen pipe, and the oxygen branch is connected to the mixing chamber.

[0012] In one embodiment, the base includes an air pipe, which is connected to the connecting piece and is used to communicate with an air source; the first air inlet path includes an air branch formed in the air pipe, and the air branch is connected to the mixing chamber.

[0013] In one embodiment, the base includes a thermal flow meter, the thermal flow meter is connected to the connecting piece, and the first air inlet path is formed in the thermal flow meter.

[0014] In one embodiment, the air flow introducer is a turbine fan, the base also includes an air flow pipe, the air flow pipe is connected to the connecting piece, the second air inlet path is formed in the air flow pipe, and the turbine fan is connected to the air flow pipe.

[0015] In one embodiment, the thermal flow meter and / or the air flow tube are detachably connected to the connecting piece.

[0016] The present application also provides a ventilator, which includes the air circuit assembly as described above.

[0017] In the above-mentioned air circuit assembly, the first air inlet and the second air inlet are respectively connected to the air outlet. The first air inlet is also connected to the air source, so the gas in the air source can be introduced into the air circuit assembly through the first air inlet, and transmitted to the user of the ventilator through the air outlet. At the same time, the air flow introducer can introduce external air into the second air inlet, so when there is no air source to provide gas, the air flow introducer can guide the external air to flow into the air outlet through the second air inlet to be transmitted to the user of the ventilator. In other words, the air circuit assembly in the present application provides two air supply modes, and when there is an air source, the air source can be directly used for air supply. When there is no air source in the outdoors, etc., the air flow introducer can be used to introduce external air to achieve the purpose of air supply. Such a setting enriches the air supply method of the ventilator used by the air circuit assembly and improves the use scenario of the ventilator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an axial schematic diagram of a gas circuit assembly provided in one embodiment of the present application.

[0019] Figure 2 for Figure 1 A top view of the base in the air path assembly is shown.

[0020] Figure 3 for Figure 2 A cross-sectional view of the base along line AA is shown.

[0021] Figure 4 for Figure 1 Axial view of the base of the gas circuit assembly shown.

[0022] Figure numerals: 10, gas path assembly; 100, base; 101, first air inlet; 101a, oxygen branch; 101b, air branch; 102, second air inlet; 103, air outlet; 110, connecting piece; 111, connecting chamber; 111a, mixing chamber; 111b, control chamber; 111c, connecting port; 111d, step portion; 111e, protruding nozzle; 112, first opening; 113, second opening; 114, first opening Three openings; 115, fourth opening; 120, oxygen pipe; 121, oxygen inlet; 122, first flow meter; 130, air pipe; 131, air inlet; 132, second flow meter; 140, air outlet pipe; 150, air flow pipe; 160, mounting plate; 200, air flow introducer; 300, stop valve; 310, valve body; 320, plugging piece; 400, pressure reducing valve; 500, proportional valve; 600, air supply flow meter. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0024] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0025] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0029] An embodiment of the present application provides a ventilator (not shown in the figure, the same below), which includes an air circuit assembly 10, and the air circuit assembly 10 has two different air supply modes. When there is an air source in the scene where the ventilator is used, the air circuit assembly 10 can transmit the gas in the air source to the user. When the scene where the ventilator is used does not include an air source, the air circuit assembly 10 can introduce air from the external environment into the air circuit assembly 10 and transmit it to the user. This arrangement allows the ventilator to ventilate the patient even in scenes where there is no air source, such as outdoors.

[0030] See also Figures 1 to 3 , an air circuit assembly 10 provided in one embodiment of the present application is used for fluid delivery of a ventilator. The air circuit assembly 10 includes a base 100 and an air flow introducer 200, the base 100 is provided with a first air inlet 101, a second air inlet 102 and an air outlet 103, the first air inlet 101 and the second air inlet 102 are respectively connected to the air outlet 103. The first air inlet 101 is also used to connect to an air source. The air flow introducer 200 is connected to the second air inlet 102, and the air flow introducer 200 is also used to communicate with the external environment to introduce external air into the second air inlet 102.

[0031] In the above-mentioned air circuit assembly 10, the first air inlet 101 and the second air inlet 102 are respectively connected to the air outlet 103. The first air inlet 101 is also connected to the air source, so the gas in the air source can be introduced into the air circuit assembly 10 through the first air inlet 101, and transmitted to the user of the respirator through the air outlet 103. At the same time, the air flow introducer 200 can introduce external air into the second air inlet 102, so when there is no air source to provide gas, the air flow introducer 200 can guide the external air to flow into the air outlet 103 through the second air inlet 102 to be transmitted to the user of the respirator. In other words, the air circuit assembly 10 in the present application provides two air supply modes, and when there is an air source, the air source can be directly used for air supply. When there is no air source in the outdoors, the air flow introducer 200 can be used to introduce external air to achieve the purpose of air supply. Such a setting enriches the air supply mode of the respirator used by the air circuit assembly 10 and improves the use scenario of the respirator.

[0032] Furthermore, since the ventilator provided in the present application has two different air supply methods, when the ventilator user is transferred from an outdoor scene to an indoor scene with an air source such as a hospital, there is no need to remove the ventilator from the user to replace the hospital ventilator. The air supply method can be switched to the air source air supply method by connecting the air source to the base 100, which is easy to operate and can improve the compatibility of the ventilator. For the sake of convenience, the air supply method using an air source for air supply will be referred to as air source air supply, and the air supply method in which the air flow is introduced from the outside by the air flow introducer 200 for air supply will be recorded as external air supply.

[0033] See also Figure 3In one embodiment, the gas circuit assembly 10 further includes a stop valve 300, which is disposed on the base 100. When the stop valve 300 is opened, the second gas inlet 102 is connected to the gas outlet 103, and when the stop valve 300 is closed, the second gas inlet 102 is cut off from the gas outlet 103. In other words, by controlling the on-off of the stop valve 300, the start and cut-off of the external gas supply can be controlled. Thus, a suitable gas supply method can be selected according to the actual use of the ventilator.

[0034] It should be noted that the gas source supply and the external gas supply are not limited to independent application, that is, when the gas source is used for gas supply, the stop valve 300 can also be controlled to open to introduce external air supply. During actual use of the ventilator, the on and off of the stop valve 300 can be controlled according to actual application requirements, and no specific limitation is made here.

[0035] See also Figure 2 and Figure 3 In one embodiment, the base 100 includes a connecting piece 110, and the connecting piece 110 is provided with a connecting chamber 111, and the connecting chamber 111 includes a mixing chamber 111a, a control chamber 111b, and a connecting port 111c connecting the mixing chamber 111a and the control chamber 111b. The second air inlet 102 is connected to the control chamber 111b, and the air outlet 103 is connected to the mixing chamber 111a. Part of the structure of the stop valve 300 is penetrated by the control chamber 111b to open or block the connecting port 111c. Therefore, when the stop valve 300 blocks the connecting port 111c, the second air inlet 102 cannot be connected to the air outlet 103 through the connecting chamber 111, and air is supplied through the air source at this time. When the shut-off valve 300 opens the connecting port 111c, the second air inlet path 102 can be connected to the air outlet path 103 by sequentially controlling the chamber 111b, the connecting port 111c and the mixing chamber 111a. At this time, the air flow introducer 200 can introduce external air into the ventilator through the above-mentioned airway to achieve external air supply.

[0036] Please continue reading Figure 2 and Figure 3 In one embodiment, the connecting member 110 has a first opening 112, a second opening 113, a third opening 114 and a fourth opening 115. The first opening 112 connects the control chamber 111b with the second air inlet 102, so that the gas in the second air inlet 102 can enter the control chamber 111b through the second opening 113. The second opening 113 connects the mixing chamber 111a with the air outlet 103, so that the gas in the mixing chamber 111a can communicate with the air outlet 103 through the second opening 113 to supply air to the user. The stop valve 300 includes a valve body 310 and a blocking member 320, and the blocking member 320 is movably arranged through the control chamber 111b to open or block the connecting port 111c.

[0037] The valve body 310 may be located outside the connecting piece 110 to relatively reduce the volume of the connecting piece 110 and facilitate better sealing.

[0038] See also Figure 3 In one embodiment, the cavity structure size of the control cavity 111b is different from that of the mixing cavity 111a, so that a step portion 111d is formed at the connection between the two. The communication port 111c is opened at the step portion 111d, and the blocking member 320 is fitted with the end surface of the step portion 111d to block the communication port 111c.

[0039] Furthermore, part of the end surface of the step portion 111d protrudes into the control cavity 111b to form a protruding mouth 111e, and the communication port 111c is formed at the protruding mouth 111e. The blocking member 320 includes a flexible body, and when the blocking member 320 abuts against the protruding mouth 111e, the flexible body can be adaptively deformed according to the shape of the protruding mouth 111e to fully block the communication port 111c.

[0040] Please refer again Figure 1 In one embodiment, the gas source may include an oxygen source and an air source. The base 100 includes an oxygen pipe fitting 120, which is connected to the connecting piece 110, and the oxygen pipe fitting 120 is used to communicate with the oxygen source. The first air inlet path 101 includes an oxygen branch 101a formed in the oxygen pipe fitting 120, and the oxygen branch 101a is connected to the mixing chamber 111a. By providing the oxygen pipe fitting 120 that is separate from the connecting piece 110, the molding difficulty of the connecting piece 110 can be reduced; at the same time, it can also facilitate the installation of various valve body structures and sensor structures on the oxygen pipe fitting 120. It should be noted that the oxygen pipe fitting 120 can be set to a tubular shape, but is not limited to being set to a tubular shape. In order to improve the convenience of connection and installation, the oxygen pipe fitting 120 can also be set to other shapes.

[0041] Furthermore, the third opening 114 is used to connect the oxygen branch 101a with the mixing chamber 111a.

[0042] Furthermore, an oxygen inlet 121 is provided at one end of the oxygen pipe 120 away from the connecting piece 110 , and the oxygen inlet 121 is used to be connected to an oxygen source to receive oxygen.

[0043] Please continue reading Figure 1In one embodiment, the base 100 includes an air pipe 130, which is connected to the connecting piece 110 and is used to communicate with an air source; the first air inlet path 101 includes an air branch 101b formed in the air pipe 130, and the air branch 101b is connected to the mixing chamber 111a. By providing an air pipe 130 that is separate from the connecting piece 110, the difficulty of forming the connecting piece 110 can be further reduced; at the same time, it can also be convenient to install various valve body 310 structures and sensor structures on the air pipe 130. It should be noted that the air pipe 130 can be set to a tubular shape, but is not limited to being set to a tubular shape. In order to improve the convenience of connection and installation, the air pipe 130 can also be set to other shapes.

[0044] Since the air pipe 130 and the oxygen pipe 120 are both connected to the mixing chamber 111 a , the air introduced by the air pipe 130 and the oxygen introduced by the oxygen pipe 120 can be mixed in the mixing chamber 111 a and delivered to the user through the air outlet 103 .

[0045] Furthermore, the fourth opening 115 is used to connect the air branch 101b with the mixing chamber 111a.

[0046] Furthermore, an air inlet 131 is provided at one end of the air pipe 130 away from the connecting piece 110 , and the air inlet 131 is used to communicate with an air source to introduce air.

[0047] In one embodiment, the oxygen source may be a high-pressure oxygen storage structure, such as an oxygen tank, etc. The air source may be a high-pressure air storage structure, such as an air tank, etc.

[0048] See also Figure 1 and Figure 3 In one embodiment, the base 100 includes a thermal flow meter, the thermal flow meter is connected to the connecting piece 110, and the first air inlet 101 is formed in the thermal flow meter. It can be understood that since the thermal flow meter itself has a tubular inner cavity, which can be used to transport gas, the thermal flow meter can be used to form the first air inlet 101.

[0049] Furthermore, the base 100 may include two thermal flow meters, which are respectively referred to as a first flow meter 122 and a second flow meter 132. The first flow meter 122 may be a part of or the entire structure of the oxygen pipe 120. The second flow meter 132 may be a part of or the entire structure of the air pipe 130.

[0050] That is to say, for the oxygen pipe fitting 120, the oxygen pipe fitting 120 may include a thermal flow meter (i.e., the first flow meter 122) to form the oxygen branch 101a and detect the oxygen flow rate. Of course, in other embodiments, the oxygen pipe fitting 120 is not limited to using a thermal flow meter. For example, the oxygen pipe fitting 120 may include an oxygen pipe (not shown in the figure, the same below) and a flow meter (not shown in the figure, the same below) provided on the oxygen pipe.

[0051] For the air pipe 130, the air pipe 130 may also include a thermal flow meter (i.e., the second flow meter 132) to form the air branch 101b and detect the air flow. Of course, in other embodiments, the air pipe 130 is not limited to using a thermal flow meter. For example, the air pipe 130 may include an air pipe (not shown in the figure, the same below) and a flow meter (not shown in the figure, the same below) provided on the air pipe.

[0052] In one embodiment, the base 100 further includes a mounting plate 160, and the connecting piece 110, the oxygen pipe 120, and the air pipe 130 are all disposed on the mounting plate 160. Thus, by connecting the connecting piece 110, the oxygen pipe 120, and the air pipe 130 through the mounting plate 160, the position stability of the three can be improved.

[0053] See also Figure 4 In one embodiment, the gas circuit assembly 10 further includes fluid control valves such as a pressure reducing valve 400 and a proportional valve 500. Taking the oxygen branch 101a as an example, the pressure reducing valve 400 and the proportional valve 500 can be directly installed on the oxygen pipe 120 to communicate with the oxygen branch 101a. Alternatively, the pressure reducing valve 400 and the proportional valve 500 can be installed on the mounting plate 160 to communicate with the oxygen branch 101a.

[0054] Similarly, the pressure reducing valve 400 and the proportional valve 500 can be directly installed on the air pipe 130 to communicate with the air branch 101b. Alternatively, the pressure reducing valve 400 and the proportional valve 500 can be installed on the mounting plate 160 to communicate with the air branch 101b.

[0055] See also Figure 4 In one embodiment, the base 100 further includes an air outlet pipe 140, the air outlet pipe 140 is connected to the connecting piece 110, and the air outlet path 103 is formed in the air outlet pipe 140. The air path assembly 10 further includes an air supply flow meter 600, which is disposed in the air outlet pipe 140 to detect the flow of the air outlet path 103. In one embodiment, the air supply flow meter 600 may be a thermal flow meter, and the air supply flow meter 600 may be connected in series with the air outlet pipe 140.

[0056] Of course, in some embodiments, similar to the above, when the gas supply flow meter 600 is used as a thermal flow meter, it itself can be used to form the gas outlet path 103.

[0057] See also Figure 1 and Figure 2 In one embodiment, the airflow introducer 200 may be a turbo blower. Of course, the airflow introducer 200 is not limited to being a turbo blower, and may also be configured as other devices having the function of introducing gas.

[0058] The base 100 further includes an airflow pipe 150, which is connected to the connecting member 110. The second air inlet 102 is formed in the airflow pipe 150, and the turbo fan is connected to the airflow pipe 150. The airflow pipe 150 can be connected to the control chamber 111b through the first opening 112.

[0059] In one embodiment, the thermal flow meter and / or the airflow tube 150 are detachably connected to the connecting piece 110. In this way, the structure of the connecting piece 110 can be relatively simplified, and the airflow tube 150 is detachably connected to the connecting piece 110, so it is convenient to connect and install the valve body structure and the sensor structure on the airflow tube 150.

[0060] Furthermore, the oxygen pipe 120, the air pipe 130 and the air outlet pipe 140 can also be arranged to be detachably connected to the connecting piece 110. In this way, not only can the structure of the connecting piece 110 be relatively simplified, but also, since each pipeline is detachably connected to the connecting piece 110, it is convenient to connect and install the valve body structure and the sensor structure on each pipeline.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An air circuit assembly, the air circuit assembly is used for fluid delivery of a ventilator, characterized in that: The gas circuit assembly comprises: A base, wherein the base is provided with an air outlet, and a first air inlet and a second air inlet respectively connected to the air outlet, wherein the first air inlet is used to connect to an air source; An airflow introducer is connected to the second air inlet path, and is also used to communicate with the external environment to introduce external air into the second air inlet path.

2. The gas circuit assembly according to claim 1, characterized in that: The gas circuit assembly further comprises a stop valve, which is arranged on a base. When the stop valve is opened, the second gas inlet circuit is connected to the gas outlet circuit. When the stop valve is closed, the second gas inlet circuit is cut off from the gas outlet circuit.

3. The gas circuit assembly according to claim 2, characterized in that: The base includes a connecting piece, which is provided with a connecting cavity. The connecting cavity includes a mixing cavity, a control cavity and a connecting port connecting the mixing cavity and the control cavity. The second air inlet path is connected to the control cavity, and the air outlet path is connected to the mixing cavity. Part of the structure of the stop valve passes through the control cavity to open or block the connecting port.

4. The gas circuit assembly according to claim 3, characterized in that: The connecting member has a first opening and a second opening, the first opening connects the control chamber with the second air inlet path, and the second opening connects the mixing chamber with the air outlet path; the stop valve includes a valve body and a blocking member, and the blocking member is movably arranged through the control chamber to open or block the connecting port.

5. The gas circuit assembly according to claim 4, characterized in that: The base includes an oxygen pipe, which is connected to the connecting piece and is used to communicate with an oxygen source; the first air inlet path includes an oxygen branch formed in the oxygen pipe, and the oxygen branch is connected to the mixing chamber.

6. The gas circuit assembly according to claim 5, characterized in that: The base includes an air pipe, which is connected to the connecting piece and is used to communicate with an air source; the first air inlet path includes an air branch formed in the air pipe, and the air branch is connected to the mixing chamber.

7. The gas circuit assembly according to claim 3, characterized in that: The base includes a thermal flow meter, the thermal flow meter is connected to the connecting piece, and the first air inlet path is formed in the thermal flow meter.

8. The gas circuit assembly according to claim 7, characterized in that: The airflow introducer is a turbine fan, the base also includes an airflow pipe, the airflow pipe is connected to the connecting piece, the second air inlet path is formed in the airflow pipe, and the turbine fan is connected to the airflow pipe.

9. The gas circuit assembly according to claim 8, characterized in that: The thermal flow meter and / or the air flow pipe are detachably connected to the connecting piece.

10. A ventilator, characterized in that: The ventilator comprises an air circuit assembly as described in any one of claims 1 to 9.

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