Breathing machine

Abstract

The utility model relates to a breathing machine. Comprising an exhalation valve which comprises a shell and a built-in sensor, and the built-in sensor is arranged in the shell; the external sensor is arranged outside the exhalation valve; the first detector comprises a first switching valve and a first pressure detection piece, the first switching valve is connected with the shell and the external sensor, and the first pressure detection piece is connected with the first switching valve; the second detector comprises a second switching valve and a second pressure detection piece, the second switching valve is connected with the shell and the external sensor, and the second pressure detection piece is connected with the second switching valve; the first switching valve and the second switching valve are switched to an external detection position, and the first pressure detection piece and the second pressure detection piece respectively detect the pressure of two positions in the external sensor; the first switching valve and the second switching valve are switched to the built-in detection position, and the first pressure detection piece and the second pressure detection piece respectively detect the pressure of two positions in the built-in sensor. In this way, the convenience of expiration flow detection can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a ventilator. Background Art

[0002] A ventilator is a widely used medical device that can help patients take in oxygen and expel carbon dioxide. Generally, a ventilator needs to detect the patient's exhaled air flow, but traditional ventilators usually have the defect of inconvenient detection. Summary of the invention

[0003] A technical problem solved by the present application is how to improve the convenience of exhalation flow detection.

[0004] A ventilator, comprising:

[0005] An exhalation valve, comprising a housing and a built-in sensor, wherein the built-in sensor is arranged inside the housing;

[0006] An external sensor, arranged outside the exhalation valve;

[0007] A first detector includes a first switching valve and a first pressure detection member, wherein the first switching valve is connected to the housing and the external sensor, and the first pressure detection member is connected to the first switching valve; and

[0008] A second detector includes a second switching valve and a second pressure detection member, wherein the second switching valve is connected to the housing and the external sensor, and the second pressure detection member is connected to the second switching valve;

[0009] In the first detection state, the first switching valve and the second switching valve are both switched to the external detection position, and the first pressure detection component and the second pressure detection component respectively detect the pressure at two positions in the external sensor; in the second detection state, the first switching valve and the second switching valve are both switched to the internal detection position, and the first pressure detection component and the second pressure detection component respectively detect the pressure at two positions in the internal sensor.

[0010] In one embodiment, an exhalation tube is further included, wherein the exhalation tube is connected between the exhalation valve and the external sensor, and gas enters the exhalation valve through the external sensor and the exhalation tube.

[0011] In one embodiment, the first switching valve has a first main air inlet, a first auxiliary air inlet and a first detection port, and the first pressure detection component is arranged at the first detection port; the second switching valve has a second main air inlet, a second auxiliary air inlet and a second detection port, and the second pressure detection component is arranged at the second detection port; in the first detection state, the first main air inlet is connected with the interior of the external sensor and the first detection port, and the second main air inlet is connected with the interior of the external sensor and the second detection port; in the second detection state, the second main air inlet is connected with the interior of the built-in sensor and the first detection port, and the second main air inlet is connected with the interior of the built-in sensor and the second detection port.

[0012] In one embodiment, the external sensor includes a housing and a first diaphragm, wherein the first diaphragm is located in the housing and divides the inner cavity of the housing into a first upstream cavity and a first downstream cavity, wherein the first upstream cavity is connected to a first main air inlet, and the first downstream cavity is connected to the second main air inlet.

[0013] In one of the embodiments, it further includes a first sampling tube connected between the first upstream chamber and the first main air inlet.

[0014] In one of the embodiments, a second sampling tube is further included, and the second sampling tube is connected between the first downstream chamber and the second main air inlet.

[0015] In one embodiment, the built-in sensor includes a second diaphragm, which divides the inner cavity of the built-in sensor into a second upstream cavity and a second downstream cavity. The shell is provided with a first connecting port and a second connecting port, the first connecting port is connected to the first auxiliary air inlet and the second upstream cavity, and the second connecting port is connected to the second auxiliary air inlet and the second downstream cavity.

[0016] In one embodiment, the air inlet further includes a first connecting pipe connected between the first connecting port and the first auxiliary air inlet.

[0017] In one embodiment, the invention further includes a second connecting pipe connected between the second connecting port and the second auxiliary air inlet.

[0018] In one embodiment, the exhalation valve and the external sensor are arranged along a first direction, the first detector and the second detector are arranged along a second direction, and the first direction and the second direction are arranged at an angle.

[0019] A technical effect of an embodiment of the present application is: by switching the first switching valve and the second switching valve between the external detection position and the internal detection position, the ventilator is switched between the first detection state and the second detection state, and then the external sensor can detect a smaller exhalation flow, thereby improving the detection accuracy, and the internal sensor can detect a larger exhalation flow. In this way, the ventilator can use different sensors for detection according to different exhalation flows, which can not only improve the detection accuracy, but also avoid the installation of various lines and improve the convenience of exhalation flow detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A simplified connection diagram of a ventilator provided in one embodiment.

[0021] Figure 2 for Figure 1 A simplified partial plan view of an external sensor in the ventilator is shown.

[0022] Figure 3 for Figure 1 A simplified plan view of the exhalation valve in the ventilator shown.

[0023] Figure numerals: ventilator 10, external sensor 100, shell 110, first diaphragm 120, first upstream cavity 130, first downstream cavity 140, exhalation valve 200, shell 210, first connecting port 211, second connecting port 212, built-in sensor 220, second membrane 221, second upstream cavity 222, second downstream cavity 223, first detector 300, first switching valve 310, first main air inlet 311, first auxiliary air inlet 312, first detection port 313, first pressure detection component 320, second detector 400, second switching valve 410, second main air inlet 411, second auxiliary air inlet 412, second detection port 413, second pressure detection component 420, first sampling tube 510, second sampling tube 520, first connecting tube 610, second connecting tube 620, exhalation tube 700. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] See also Figure 1 , Figure 2 and Figure 3 In one embodiment of the present application, a ventilator 10 is provided, which includes an external sensor 100, an exhalation valve 200, a first detector 300, and a second detector 400. Through the joint action of the external sensor 100, the exhalation valve 200, the first detector 300, and the second detector 400, the flow rate of the gas exhaled by the patient can be detected, thereby providing a reference basis for the patient's critical condition or the airtightness of the ventilator 10.

[0031] In some embodiments, the external sensor 100 is used to detect the gas flow rate. The external sensor 100 is arranged outside the exhalation valve 200, so that the external sensor 100 and the exhalation valve 200 are arranged at a distance from each other. The external sensor 100 includes a housing 110 and a first diaphragm 120, and the first diaphragm 120 allows gas to pass through. The first diaphragm 120 is located in the inner cavity of the housing 110, so that the first diaphragm 120 divides the inner cavity of the housing 110 into a first upstream cavity 130 and a first downstream cavity 140, and the gas passes through the first diaphragm 120 from the first upstream cavity 130 to the first downstream cavity 140. In the process of gas passing through the first diaphragm 120, the energy of the gas is lost, so that the pressure of the gas decreases, so the pressure in the first upstream cavity 130 will be greater than the pressure in the first downstream cavity 140, so that there is a pressure difference between the first upstream cavity 130 and the first downstream cavity 140. The external sensor 100 can calculate the flow rate of the gas flowing into the external sensor 100 according to the pressure difference between the first upstream chamber 130 and the first downstream chamber 140 .

[0032] In some embodiments, the exhalation valve 200 includes a housing 210 and a built-in sensor 220, the built-in sensor 220 is integrated inside the housing 210, and the built-in sensor 220 includes a second diaphragm 221, and the second diaphragm 221 allows gas to pass through. The second diaphragm 221 is located in the inner cavity of the built-in sensor 220, so that the second diaphragm 221 divides the inner cavity of the built-in sensor 220 into a second upstream cavity 222 and a second downstream cavity 223, and the gas passes through the second diaphragm 221 from the second upstream cavity 222 to the second downstream cavity 223. In the process of gas passing through the second diaphragm 221, the energy of the gas is lost, so that the pressure of the gas decreases, so the pressure in the second upstream cavity 222 will be greater than the pressure in the second downstream cavity 223, so that there is a pressure difference between the second upstream cavity 222 and the second downstream cavity 223. The built-in sensor 220 can calculate the flow rate of the gas flowing into the built-in sensor 220 according to the pressure difference between the second upstream cavity 222 and the second downstream cavity 223. The housing 210 is provided with a first communication port 211 and a second communication port 212 which are spaced apart from each other on the housing 210. The first communication port 211 is communicated with the second upstream chamber 222, and the second communication port 212 is communicated with the second downstream chamber 223.

[0033] In some embodiments, the exhalation valve 200 and the external sensor 100 are arranged along a first direction, so that the exhalation valve 200 and the external sensor 100 are spaced a certain distance apart along the first direction. The first detector 300 and the second detector 400 are arranged along a second direction, so that the first detector 300 and the second detector 400 are spaced a certain distance apart along the second direction. The first direction and the second direction are arranged at an angle, for example, the first direction and the second direction can be perpendicular to each other, so that the reasonable layout of the various components of the ventilator 10 can be facilitated.

[0034] In some embodiments, the ventilator 10 further includes a first sampling tube 510 and a first connecting tube 610, both of which are used to transport gas. The first detector 300 includes a first switching valve 310 and a first pressure detection member 320, the first switching valve 310 is connected to the housing 210 and the external sensor 100, and the first pressure detection member 320 is connected to the first switching valve 310. For example, the first switching valve 310 has a first main air inlet 311, a first auxiliary air inlet 312 and a first detection port 313, the first pressure detection member 320 is disposed at the first detection port 313, and the first pressure detection member 320 is used to detect the gas pressure of the first detection port 313. The first sampling tube 510 is connected between the first upstream cavity 130 and the first main air inlet 311, so that one end of the first sampling tube 510 is fixed on the external sensor 100 and the other end is fixed on the first switching valve 310, and then the inner cavity of the first sampling tube 510 is connected to the first upstream cavity 130 and the first main air inlet 311 at the same time.

[0035] The first connecting tube 610 is connected between the first connecting port 211 and the first auxiliary air inlet 312, so that one end of the first connecting tube 610 is fixed on the first switching valve 310 and the other end is fixed on the exhalation valve 200, thereby making the inner cavity of the first connecting tube 610 simultaneously connected with the second upstream cavity 222 and the first auxiliary air inlet 312.

[0036] The ventilator 10 has a first detection state and a second detection state. In the first detection state, the first switching valve 310 will switch to the external detection position, so that the first main air inlet 311 and the first detection port 313 are connected to each other, while the first auxiliary air inlet 312 and the first detection port 313 are not connected to each other and are isolated from each other. Therefore, in the first detection state, the gas in the first upstream cavity 130 can enter the first detection port 313 through the first sampling tube 510 and the first main air inlet 311 in sequence, so that the first pressure detection is used to detect the pressure of the first detection port 313, and the pressure of the first detection port 313 is equal to the pressure of the first upstream cavity 130, so that the first pressure detection can detect the pressure of the gas in the first upstream cavity 130.

[0037] In the second detection state, the first switching valve 310 will switch to the built-in detection position, so that the first main air inlet 311 and the first detection port 313 are not connected to each other but isolated from each other, while the first auxiliary air inlet 312 and the first detection port 313 are connected to each other. Therefore, in the second detection state, the gas in the second upstream cavity 222 can enter the first detection port 313 through the first connecting port 211, the first connecting pipe 610, and the first auxiliary air inlet 312 in sequence, so that the first pressure detection member 320 is used to detect the pressure of the first detection port 313, and the pressure of the first detection port 313 is equal to the pressure of the second upstream cavity 222, so that the first pressure detection member 320 can detect the pressure of the gas in the second upstream cavity 222.

[0038] In some embodiments, the ventilator 10 further includes a second sampling tube 520 and a second connecting tube 620, both of which are used to transport gas. The second detector 400 includes a second switching valve 410 and a second pressure detection member 420, the second switching valve 410 is connected to the housing 210 and the external sensor 100, and the second pressure detection member 420 is connected to the second switching valve 410. For example, the second switching valve 410 has a second main air inlet 411, a second auxiliary air inlet 412, and a second detection port 413, and the second pressure detection member 420 is disposed at the second detection port 413, and the second pressure detection member 420 is used to detect the gas pressure of the second detection port 413. The second sampling tube 520 is connected between the first downstream cavity 140 and the second main air inlet 411, so that one end of the second sampling tube 520 is fixed on the external sensor 100 and the other end is fixed on the second switching valve 410, thereby making the inner cavity of the second sampling tube 520 communicate with the first downstream cavity 140 and the second main air inlet 411 at the same time.

[0039] The second connecting tube 620 is connected between the second connecting port 212 and the second auxiliary air inlet 412, so that one end of the second connecting tube 620 is fixed on the second switching valve 410 and the other end is fixed on the exhalation valve 200, thereby making the inner cavity of the second connecting tube 620 simultaneously connected with the second downstream cavity 223 and the second auxiliary air inlet 412.

[0040] The ventilator 10 has a first detection state and a second detection state. In the first detection state, the second switching valve 410 will switch to the external detection position, so that the second main air inlet 411 and the second detection port 413 are connected to each other, while the second auxiliary air inlet 412 and the second detection port 413 are not connected to each other and are isolated from each other. Therefore, in the first detection state, the gas in the first downstream cavity 140 can enter the second detection port 413 through the second sampling tube 520 and the second main air inlet 411 in sequence, so that the second pressure detection member 420 is used to detect the pressure of the second detection port 413, and the pressure of the second detection port 413 is equal to the pressure of the first downstream cavity 140, so that the second pressure detection member 420 can detect the pressure of the gas in the first downstream cavity 140.

[0041] In the second detection state, the second switching valve 410 will switch to the built-in detection position, so that the second main air inlet 411 and the second detection port 413 are not connected to each other but isolated from each other, while the second auxiliary air inlet 412 and the second detection port 413 are connected to each other. Therefore, in the second detection state, the gas in the second downstream cavity 223 can enter the second detection port 413 through the second connecting port 212, the second connecting pipe 620, and the second auxiliary air inlet 412 in sequence, so that the second pressure detection is used to detect the pressure of the second detection port 413, and the pressure of the second detection port 413 is equal to the pressure of the second downstream cavity 223, so that the second pressure detection member 420 can detect the pressure of the gas in the second downstream cavity 223.

[0042] Therefore, when the ventilator 10 is in the first detection state, the first switching valve 310 and the second switching valve 410 are both switched to the external detection position, so that the first pressure detection member 320 is used to detect the pressure in the first upstream cavity 130 in the external sensor 100, and the second pressure detection member 420 is used to detect the pressure in the first downstream cavity 140 in the external sensor 100, and the external sensor 100 can calculate the flow of the gas flowing through the external sensor 100 according to the pressure difference between the first upstream cavity 130 and the first downstream cavity 140. When the ventilator 10 is in the second detection state, the first switching valve 310 and the second switching valve 410 are both switched to the internal detection position. So that the first pressure detection member 320 is used to detect the pressure in the second upstream cavity 222 in the internal sensor 220, and the second pressure detection member 420 is used to detect the pressure in the second downstream cavity 223 in the internal sensor 220, and the internal sensor 220 can calculate the flow of the gas flowing through the internal sensor 220 according to the pressure difference between the second upstream cavity 222 and the second downstream cavity 223.

[0043] The ventilator 10 further includes an exhalation tube 700, which is connected between the exhalation valve 200 and the external sensor 100. The gas enters the exhalation valve 200 through the external sensor 100 and the exhalation tube 700, so that the exhalation valve 200 discharges the carbon dioxide exhaled by the patient. For example, the inner cavity of the exhalation tube 700 is connected to the first downstream cavity 140 of the external sensor 100 and the second upstream cavity 222 of the internal sensor 220 at the same time, and the gas exhaled by the patient passes through the first upstream cavity 130 and the first downstream cavity 140 in sequence to enter the second upstream cavity 222.

[0044] When the patient's exhaled air flow is small, the ventilator 10 will be in the first detection state. At this time, since the first main air inlet 311 and the first detection port 313 are interconnected, and the first auxiliary air inlet 312 is isolated from the first detection port 313, the first pressure detection component 320 can only detect the pressure in the first upstream cavity 130 of the external sensor 100, and the first pressure detection component 320 cannot detect the pressure in the second upstream cavity 222 of the built-in sensor 220. At the same time, since the second main air inlet 411 and the second detection port 413 are interconnected, and the second auxiliary air inlet 412 is isolated from the second detection port 413, the second pressure detection component 420 can only detect the pressure in the first downstream cavity 140 of the external sensor 100, and the second pressure detection component 420 cannot detect the pressure in the second downstream cavity 223 of the built-in sensor 220. Therefore, the first pressure detection member 320 and the second pressure detection member 420 detect the air pressure in the external sensor 100, while the first pressure detection member 320 and the second pressure detection member 420 cannot detect the air pressure in the internal sensor 220, so that the external sensor 100 can calculate the flow rate of the gas flowing through the external sensor 100 according to the pressure difference between the first upstream cavity 130 and the first downstream cavity 140. In fact, since the external sensor 100 is close to the patient, the detection accuracy of the small flow rate gas can be improved through the detection of the external sensor 100.

[0045] When the patient's exhalation flow is large, the ventilator 10 will be in the second detection state. At this time, since the first main air inlet 311 and the first detection port 313 are isolated from each other, and the first auxiliary air inlet 312 is connected to the first detection port 313, the first pressure detection component 320 cannot detect the pressure in the first upstream cavity 130 of the external sensor 100, and the first pressure detection component 320 can only detect the pressure of the second upstream cavity 222 in the built-in sensor 220. At the same time, since the second main air inlet 411 and the second detection port 413 are isolated from each other, and the second auxiliary air inlet 412 is connected to the second detection port 413, the second pressure detection component 420 cannot detect the pressure in the first downstream cavity 140 of the external sensor 100, and the second pressure detection component 420 can only detect the pressure of the second downstream cavity 223 in the built-in sensor 220. Therefore, the first pressure detection member 320 and the second pressure detection member 420 detect the air pressure in the built-in sensor 220, while the first pressure detection member 320 and the second pressure detection member 420 cannot detect the air pressure in the external sensor 100, so that the built-in sensor 220 can calculate the flow rate of the gas flowing through the built-in sensor 220 according to the pressure difference in the second upstream cavity 222 and the second downstream cavity 223. In fact, when the flow rate of the patient's exhaled gas is large, the flow rate can be detected by the built-in sensor 220 integrated in the exhalation valve 200.

[0046] Therefore, by switching the first switching valve 310 and the second switching valve 410 between the external detection position and the internal detection position, the ventilator switches between the first detection state and the second detection state, and then the external sensor 100 can detect a smaller exhalation flow rate, thereby improving the detection accuracy, and the internal sensor 220 can detect a larger exhalation flow rate. In this way, the ventilator 10 can use different sensors for detection according to different exhalation flows, which can not only improve the detection accuracy, but also avoid the installation of various lines and improve the convenience of exhalation flow detection.

[0047] 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.

[0048] 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. A ventilator, It is characterized in that include: An exhalation valve, comprising a housing and a built-in sensor, wherein the built-in sensor is arranged inside the housing; An external sensor, arranged outside the exhalation valve; A first detector, comprising a first switching valve and a first pressure detecting member, wherein the first switching valve is connected to the housing and the external sensor, and the first pressure detecting member is connected to the first switching valve; and A second detector includes a second switching valve and a second pressure detection member, wherein the second switching valve is connected to the housing and the external sensor, and the second pressure detection member is connected to the second switching valve; In the first detection state, the first switching valve and the second switching valve are both switched to the external detection position, and the first pressure detection component and the second pressure detection component respectively detect the pressure at two positions in the external sensor; in the second detection state, the first switching valve and the second switching valve are both switched to the internal detection position, and the first pressure detection component and the second pressure detection component respectively detect the pressure at two positions in the internal sensor.

2. The ventilator according to claim 1, It is characterized in that It also includes an exhalation tube, which is connected between the exhalation valve and the external sensor, and the gas enters the exhalation valve through the external sensor and the exhalation tube.

3. The ventilator according to claim 1, It is characterized in that The first switching valve has a first main air inlet, a first auxiliary air inlet and a first detection port, and the first pressure detection component is arranged at the first detection port; the second switching valve has a second main air inlet, a second auxiliary air inlet and a second detection port, and the second pressure detection component is arranged at the second detection port; In the first detection state, the first main air inlet is connected with the interior of the external sensor and the first detection port, and the second main air inlet is connected with the interior of the external sensor and the second detection port; in the second detection state, the second main air inlet is connected with the interior of the built-in sensor and the first detection port, and the second main air inlet is connected with the interior of the built-in sensor and the second detection port.

4. The ventilator according to claim 3, It is characterized in that The external sensor includes a shell and a first diaphragm, wherein the first diaphragm is located in the shell and divides the inner cavity of the shell into a first upstream cavity and a first downstream cavity, wherein the first upstream cavity is connected to a first main air inlet, and the first downstream cavity is connected to the second main air inlet.

5. The ventilator according to claim 4, It is characterized in that The system also includes a first sampling tube connected between the first upstream chamber and the first main air inlet.

6. The ventilator according to claim 4, It is characterized in that The system also includes a second sampling tube connected between the first downstream chamber and the second main air inlet.

7. The ventilator according to claim 3, It is characterized in that The built-in sensor includes a second diaphragm, which divides the inner cavity of the built-in sensor into a second upstream cavity and a second downstream cavity. The shell is provided with a first connecting port and a second connecting port, the first connecting port is connected to the first auxiliary air inlet and the second upstream cavity, and the second connecting port is connected to the second auxiliary air inlet and the second downstream cavity.

8. The ventilator according to claim 7, It is characterized in that The invention also includes a first communicating pipe connected between the first communicating port and the first auxiliary air inlet.

9. The ventilator according to claim 7, It is characterized in that The invention further includes a second communicating pipe connected between the second communicating port and the second auxiliary air inlet.

10. The ventilator according to claim 1, It is characterized in that The exhalation valve and the external sensor are arranged along a first direction, the first detector and the second detector are arranged along a second direction, and the first direction and the second direction are arranged at an angle.

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