Breathing assisting device and breathing gas supply system

Abstract

The invention relates to installation of a water level detection module in a breathing assisting device, and provides a breathing assisting device and a breathing gas supply system. A respiratory assist device for heating and humidifying a flow of gas delivered to a user, comprising: a humidifier unit, at least part of the outer peripheral surface of which forms a first curved surface; the heating module is used for providing heat energy for the humidifier unit so as to heat water in the humidifier unit; the shell is provided with a surrounding part, the surrounding part is used for surrounding the humidifier unit and the heating module, and at least part of the surrounding part forms a second curved surface; and the water level identification module is installed on the fence part, the water level identification module is provided with a first side and a second side which are opposite, at least one part of the first side is matched with the first curved surface, and at least one part of the second side is matched with the second curved surface. The invention mainly solves the technical problems of large structure size, many parts and high cost of a water level detection module independently arranged on the breathing assisting device.

Description

Technical Field

[0001] The invention relates to the installation of a water level detection module in a breathing assistance device. Background Art

[0002] The gas sources of ventilators, anesthesia machines and oxygen therapy devices are often relatively dry and cold, which can easily irritate the cardiopulmonary system. Humidifiers have the function of heating and humidifying respiratory gases, and can be used as supporting equipment for ventilators and anesthesia machines, while oxygen therapy devices are generally also equipped with heating and humidification devices. By heating and humidifying the respiratory airflow, it is helpful for patients to adapt to mechanical ventilation, keep the alveoli moist and active, keep the airways and airway secretions moist, and also help to suction sputum and prevent airway blockage. Therefore, the heating and humidification function is very critical.

[0003] The heating and humidification function is an important function of medical equipment such as ventilators, humidifiers and oxygen therapy devices. Its implementation principle is to heat the water in the water tank installed on the instrument to produce hot water at a certain temperature, and use the hot water to heat and humidify the gas flowing through the water tank.

[0004] An important factor affecting the normal function of heating and humidification is the water level in the water tank. If the water level is too high or too low, it will have an adverse effect on the effect of heating and humidification. Therefore, the humidifier system control software needs to obtain the water level information in the water tank in real time. Most of the water level detection in the industry relies on algorithm estimation, and the accuracy of the algorithm estimation is low; some of it is achieved by setting up a physical water level recognition structure. However, setting up a physical water level recognition structure requires adding an independent water level detection module. The water level detection module will protrude from the outside of the heating and humidification device, resulting in a larger structure size of the humidifier, more parts, and increased costs. There is also a risk of scratching or bumping the water tank during use; in addition, the added water level detection module is more abrupt and will affect the appearance of the device. All of the above factors are not conducive to the application of this detection method. Summary of the invention

[0005] The present invention mainly solves the technical problems that a water level detection module separately provided in a respiratory assistance device has a large structure size, many parts and high cost.

[0006] In a first aspect, the present invention provides a breathing assistance device.

[0007] A breathing assistance device for heating and humidifying a flow of gas delivered to a user, comprising:

[0008] A humidifier unit having an inlet port and an outlet port, the humidifier unit being configured to receive a gas flow through the inlet port, heat water in the humidifier unit to heat and humidify the gas flow, and discharge the heated and humidified gas flow through the outlet port; the humidifier unit comprising an outer peripheral surface, at least a portion of which forms a first curved surface;

[0009] a heating module, the heating module being used to provide thermal energy to the humidifier unit to heat water in the humidifier unit;

[0010] A housing, wherein the housing has an enclosure portion, the enclosure portion is used to enclose the humidifier unit and the heating module, and at least a portion of the enclosure portion forms a second curved surface;

[0011] And a water level identification module, which is installed on the enclosure part and is used to identify the water level in the humidifier unit. The water level identification module has a first side and a second side opposite to each other, at least a portion of the first side is adapted to the first curved surface, and at least a portion of the second side is adapted to the second curved surface.

[0012] In a technical solution, the humidifier unit is installed to the enclosure portion along an installation direction; on a projection plane perpendicular to the installation direction, a projection of the water level identification module at least partially overlaps with a projection of the enclosure portion.

[0013] In a technical solution, the enclosure portion has a mounting portion, and the water level identification module is mounted on the mounting portion and is located on a side of the enclosure portion close to the humidifier unit.

[0014] In a technical solution, the enclosure portion is provided with an installation cavity having an installation port for installing the water level identification module, and at least a portion of the water level identification module is installed in the installation cavity.

[0015] In a technical solution, the loading port of the installation cavity faces the humidifier unit, the water level identification module includes a capacitive water level sensor, and the enclosure portion covers a side of the capacitive water level sensor that faces away from the humidifier unit.

[0016] In a technical solution, the humidifier unit is installed to the enclosure portion along the installation direction; a portion of the second curved surface forms a loading structure for guiding the humidifier unit to be loaded along the installation direction and fixed to the shell.

[0017] In a technical solution, the water level identification module includes a module panel, and a side of the module panel facing the humidifier unit is a first side of the water level identification module, which is used to directly contact the outer peripheral surface of the humidifier unit.

[0018] In a technical solution, the water level identification module further includes a capacitive water level sensor having a first surface and a second surface opposite to each other, wherein the first surface is adapted to the first side.

[0019] In a technical solution, the first surface and the second surface have the same surface curvature.

[0020] In a technical solution, the capacitive water level sensor is fixed on the module panel by adhesive bonding.

[0021] In a technical solution, the enclosure part includes a first part on which the water level identification module is installed and a second part connected to the first part along the circumference of the shell, and at least part of the first part forms the second curved surface; the heating module is arranged on the shell and located at the bottom of the humidifier unit, the maximum height of the top of the first part from the heating module is a first height, and the maximum height of the top of the second part from the heating module is a second height, wherein the first height is greater than the second height; the height of the water level identification module is greater than the second height and less than the first height.

[0022] In a technical solution, the top of the first part and the top of the second part are connected via a curved transition.

[0023] In a technical solution, the water level identification module is movably arranged along the installation direction; the size of the water level identification module in the horizontal direction perpendicular to the installation direction is larger than its size in the vertical direction, the water level identification module includes a first guide structure, and the enclosure part includes a second guide structure, the first guide structure and the second guide structure are socketed and matched along the movable direction of the water level identification module to realize the guidance of the water level identification module; wherein, the matching clearance between the first guide structure and the second guide structure in the horizontal direction perpendicular to the installation direction is larger than the matching clearance in the vertical direction.

[0024] In a technical solution, an elastic member is provided between the water level identification module and the housing, and the elastic member is used to apply a thrust force toward the water level identification module to the water level identification module.

[0025] In a technical solution, the dimension of the water level identification module in a horizontal direction perpendicular to the installation direction is larger than its dimension in a vertical direction, the water level identification module includes a first guide structure, the enclosure part includes a second guide structure, the first guide structure and the second guide structure are socketed and matched along the movable direction of the water level identification module to guide the water level identification module; the elastic member is a coil spring, and the coil spring is sleeved on the radial outside of the first guide structure and the second guide structure.

[0026] In a technical solution, the shell includes an elastic pushing structure for applying a pushing force to the humidifier unit toward the water level identification module.

[0027] In a technical solution, the water level identification module is movably arranged along the installation direction; the enclosure part includes a third guide structure, and the water level identification module includes a fourth guide structure, and the third guide structure and the fourth guide structure are arranged along the vertical direction; wherein, the third guide structure and the fourth guide structure are snap-fitted together to realize the guidance of the water level identification module, and the end of the third guide structure close to the humidifier unit or the end of the fourth guide structure away from the humidifier unit is a blind end, and the blind end is used to limit the movable range of the water level identification module.

[0028] In a technical solution, the first curved surface and the second curved surface have the same surface curvature.

[0029] In one technical solution, the water level identification module is connected to a cable, and the shell is provided with a cable passage opening for the cable to pass through. The shell includes a retaining wall located on the side of the cable passage opening close to the humidifier unit, and the height of the retaining wall is configured to be higher than the heating module to prevent liquid from flowing into the cable passage opening.

[0030] In a second aspect, the present invention provides a breathing gas supply system.

[0031] A breathing gas supply system comprises a gas generating device for outputting an airflow, a gas pipeline and a breathing assistance device as described in any of the above technical solutions, wherein the gas generating device is connected to the breathing assistance device through the gas pipeline.

[0032] In a technical solution, the breathing assistance device is located on the upper side of the gas generating device, or the breathing assistance device is located on one side of the gas generating device in the horizontal direction and protrudes from the side of the gas generating device.

[0033] In one technical solution, the breathing assistance device is located at the bottom of the side of the gas generating device, the water level identification module is arranged on the side of the breathing assistance device close to the gas generating device, a loading structure is provided on the shell of the breathing assistance device, and the loading structure is used to guide the humidifier unit to be loaded and fixed to the shell, and a water tank loading port is provided on the side of the breathing assistance device away from the gas generating device, and the water tank loading port allows the humidifier unit to enter the loading structure.

[0034] In a third aspect, the present invention provides another breathing assistance device.

[0035] A breathing assistance device for heating and humidifying a flow of gas delivered to a user, comprising:

[0036] A humidifier unit having an inlet port and an outlet port, the humidifier unit being adapted to receive a gas flow through the inlet port, heat water inside the humidifier unit to heat and humidify the gas flow, and discharge the heated and humidified gas flow through the outlet port; the humidifier unit comprising an outer peripheral surface, at least a portion of which forms a first curved surface;

[0037] a heating module, the heating module being used to provide thermal energy to the humidifier unit to heat water in the humidifier unit;

[0038] A housing, wherein the housing has an enclosure portion, and the enclosure portion is used to enclose the periphery of the humidifier unit and the heating module;

[0039] and a water level identification module mounted on the enclosure portion for identifying the water level in the humidifier unit, the water level identification module having a first side and a second side opposite to each other, at least a portion of the first side being adapted to the first curved surface, and at least a portion of the second side being mounted in cooperation with the enclosure portion;

[0040] The enclosure portion is provided with an installation cavity having an installation port for installing the water level identification module, and at least a portion of the water level identification module is arranged in the installation cavity.

[0041] In a fourth aspect, the present invention provides yet another breathing assistance device.

[0042] A breathing assistance device for heating and humidifying a flow of gas delivered to a user, comprising:

[0043] a humidifier unit having an inlet port and an outlet port, the humidifier unit being adapted to receive a gas flow through the inlet port, heat water inside the humidifier unit to heat and humidify the gas flow, and discharge the heated and humidified gas flow through the outlet port;

[0044] a heating module, the heating module being used to provide thermal energy to the humidifier unit to heat water in the humidifier unit;

[0045] A housing, wherein the housing has an enclosure portion, and the enclosure portion is used to enclose the periphery of the humidifier unit and the heating module;

[0046] and a water level identification module, which is mounted on the enclosure portion and is used to identify the water level in the humidifier unit;

[0047] The enclosure part includes a first part on which the water level identification module is installed and a second part connected to the first part along the circumference of the shell; the heating module is arranged on the shell and located at the bottom of the humidifier unit, the maximum height of the top of the first part from the heating module is a first height, and the maximum height of the top of the second part from the heating module is a second height, wherein the first height is greater than the second height; the height of the water level identification module is greater than the second height and less than the first height.

[0048] Beneficial effects of the present invention:

[0049] According to the above-mentioned breathing assistance device, the enclosure part set on the shell can provide an installation basis for the water level identification module. No matter whether it is relying on the first side and the second side of the water level identification module to respectively adapt to the first curved surface formed by the outer peripheral surface of the humidifier unit and the second curved surface formed by the enclosure part, or the water level identification module is installed in the installation cavity on the enclosure part, or the water level identification module is installed in the first part of the enclosure part that is higher than the heating module, at least a part of the water level identification module can be integrated with the enclosure part, which is beneficial to control the structural size of the shell, create conditions for reducing the number of parts (for example, the water level identification module utilizes at least a part of the shell), and is also beneficial to reducing material costs and parts costs. It can also avoid the water level identification module being too abrupt on the shell of the breathing assistance device, thereby helping to reduce the impact on the appearance of the breathing assistance device, reduce the risk of scratching or bumping the water tank, and is beneficial to the application of the detection method of setting a physical water level identification structure.

[0050] Similarly, for the breathing gas supply system, the water level identification module in the breathing assistance device of the present invention can control the structural dimensions of the shell while achieving more accurate water level detection, thereby creating conditions for reducing the number of parts, thereby helping to reduce material costs and parts costs, and can avoid being too protruding on the shell of the corresponding device in the breathing gas supply system or on the shell of the breathing assistance device itself, thereby reducing the risk of scratching or bumping the water tank, having a beautiful appearance, and facilitating the application of the detection method of setting a physical water level identification structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A three-dimensional diagram of a host in one embodiment of a breathing assistance device in the present invention;

[0052] Figure 2 for Figure 1 Schematic diagram of the middle enclosure;

[0053] Figure 3 for Figure 1 Schematic diagram of the middle enclosure after removing the water level recognition module;

[0054] Figure 4 for Figure 1 Schematic diagram of the assembly structure of the water level identification module;

[0055] Figure 5 This is a schematic diagram of another embodiment of a breathing assistance device in the present invention with the water level identification module removed;

[0056] Figure 6 for Figure 5 Schematic diagram of the assembly structure of the water level identification module;

[0057] Figure 7 A three-dimensional diagram of a host in one embodiment of a breathing gas supply system of the present invention;

[0058] Figure 8 for Figure 7 Schematic diagram of the middle enclosure;

[0059] Fig. 9 for Figure 7 A schematic diagram of the structure of the host after the humidifier unit is installed;

[0060] Fig.10 for Fig. 9 The main unit and humidifier unit are separated.

[0061] List of feature names corresponding to the reference numerals in the figure:

[0062] 100, housing; 110, enclosure portion; 111, first portion; 112, second portion; 113, transition portion; 120, installation cavity; 121, loading port; 130, operation panel; 140, loading chute;

[0063] 200, water tank unlock button;

[0064] 300. Heating module;

[0065] 400, water level recognition module; 410, module panel; 420, water level sensor; 430, wedge-shaped protrusion;

[0066] 510, first guide structure; 520, second guide structure; 530, third guide structure; 540, fourth guide structure; 550, reinforcing rib plate; 551, embedded groove;

[0067] 600, elastic parts;

[0068] 710, crossing line; 720, retaining wall;

[0069] 900, main body, 910, humidifier unit; 911, limiter; 920, adapter. DETAILED DESCRIPTION

[0070] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0071] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0072] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0073] The respiratory assistance device provided by the present invention is used for heating and humidifying the gas flow delivered to the user, and can be used in devices such as ventilators, anesthesia machines and oxygen therapy devices that require heating and humidification of respiratory gases. The water level in the humidifier unit is detected by a water level detection module. Compared with water level detection based on algorithm estimation, the water level detection accuracy can be better guaranteed, and the scope of application is wider. In addition, when a sensor is used for water level recognition in order to improve the accuracy of water level recognition, since the water level to be detected in the humidifier unit must be higher than the heating module in the respiratory assistance device, it is necessary to additionally set a detection module higher than the top surface of the shell on the shell of the respiratory assistance device, resulting in the detection module being abrupt and having a rough structure. In some embodiments of the present invention, a barrier portion is provided on the shell of the respiratory assistance device, and the water level detection module is integrated into the barrier portion, so that at least a portion of the shell of the water level recognition module utilizes the barrier portion, which can not only achieve a higher detection accuracy, but also ensure a beautiful appearance.

[0074] An embodiment of a breathing assistance device in the present invention:

[0075] In one embodiment, please refer to Figures 1 to 4 The respiratory assistance device is a humidifier, which includes two main parts: a host and a humidifier unit (not shown in the figure, which can be a humidifier unit common to humidifiers). The host includes a housing 100, a heating module 300 and a water level identification module 400. The housing 100 can include a separate upper housing and a bottom housing, or an integrated housing. The bottom housing can be provided with a power socket, a power board, etc., and the upper housing can be provided with an operation panel 130, a main control board, etc. The host can be removably placed for the humidifier unit, and the humidifier unit can be heated by the heating module 300. The heating module 300 is generally located at the top of the housing 100, and its top surface can contact the bottom surface of the humidifier unit and provide heat energy to the humidifier unit by heat transfer, thereby generating a corresponding heating temperature under the control of a control unit (such as a main control board), realizing the heating of the water in the humidifier unit, so that the water in the humidifier unit meets the corresponding heating and humidification requirements. The specific structure and control method of the heating module 300 can adopt the existing technology, which will not be described in detail in the present invention.

[0076] In particular, when the breathing aid is used as a stand-alone unit, please refer to Figure 1 , an operation panel 130 is generally provided on it, and the operation panel 130 can be provided on the side of the housing. A display screen can be provided on the operation panel 130 to facilitate display of device information and / or touch operation. In order to more clearly explain the specific implementation and technical solution of the present invention, please refer to Figure 1, the side of the respiratory assistance device on which the operation panel 130 is provided is regarded as the front side of the respiratory assistance device, which is generally also the loading side when the humidifier unit is installed on the respiratory assistance device. Correspondingly, the side of the respiratory assistance device facing away from the operation panel 130 is regarded as the rear side. At the same time, the left side and the right side when the user faces the operation panel 130 are regarded as the left side and the right side of the respiratory assistance device, respectively. Of course, it should be noted that the above definition of orientation does not limit the specific implementation methods and technical solutions of the present invention to be arranged in this way.

[0077] In some other embodiments, the breathing assistance device can also be integrated with a corresponding device in the matching breathing gas supply system as a part of the corresponding device in the breathing gas supply system to form an oxygen therapy device (see Figures 7 to 10 ). In this case, the respiratory assistance device itself may also omit the control panel and be controlled by the corresponding device in the respiratory gas supply system.

[0078] The humidifier unit is a conventional structure in a humidifier. In simple terms, it can be considered as a water tank with an inlet port and an outlet port, also called a humidifier tank. The humidifier unit may include a main body located at the lower half, and an inlet port and an outlet port located at the top; the inlet port and the outlet port are connected to the top surface of the main body and can be communicated with the adapter tube 920 (see Fig. 9 and Fig.10 ). In some other embodiments, the adapter tube 920 may not be required. The humidifier unit is configured to receive a gas flow through an inlet port, heat the water in the humidifier unit by means of the above-mentioned heating module 300 to heat and humidify the gas flow, and discharge the heated and humidified gas flow through an outlet port. In addition, the cross-section of the lower half of the humidifier unit is generally circular, and the outer peripheral surface is a cylindrical surface or a conical surface with a small taper. For ease of distinction, the outer peripheral surface of the lower half of the humidifier unit is referred to as the first curved surface in the present invention. A limiting portion 911 is generally provided at the bottom of the outer peripheral surface of the humidifier unit. Specifically, in one embodiment, the humidifier unit may include a plastic cover body and a metal chassis connected to the bottom of the plastic cover body, and the bottom of the plastic cover body and the metal chassis both protrude radially outward from the humidifier unit to form an annular protrusion, namely, the limiting portion 911. When installing the humidifier unit on the respiratory assistance device, the limiting portion 911 can be aligned with the loading chute 140 arranged horizontally at the top of the respiratory assistance device (please refer to Figure 2 , which will be described in detail below), the humidifier unit can be limited in the vertical direction by relying on the limiting part 911.

[0079] Of course, in some other embodiments, the humidifier unit may also be in other shapes, for example, the overall profile is cylindrical, and the inlet port and the outlet port do not adopt the shape of Fig. 9The humidifier unit does not protrude from the top surface of the main body, but is directly opened on the top surface of the main body. In addition, the limiting portion 911 at the bottom of the humidifier unit can also be formed by a plastic cover alone, or by a metal chassis alone.

[0080] It should be noted that the humidifier units on the market can be divided into dedicated water tanks and universal water tanks. Dedicated water tanks are closed water tanks suitable for specific products. Water level detection can be achieved through optical sensors, but the structure is relatively complex and the cost is relatively high, so they are generally not universal. Universal water tanks are open water tanks that can be adapted to different hosts. They have a simple structure and low cost, and generally use algorithms to identify water levels. Some hosts of respiratory assistance devices will also directly assemble a detection module outside the housing 100 for the universal water tank, and rely on sensors to achieve more accurate water level detection than algorithm recognition, but there are also problems with the abruptness and rough structure of the above-mentioned detection module.

[0081] In the present invention, please refer to Figures 1 to 3 The housing 100 of the breathing assistance device has an enclosure portion 110, and the enclosure portion 110 is used to enclose the humidifier unit and the heating module 300. It should be noted that the above-mentioned "enclosure" refers to at least partial surrounding and shielding, and is not used to limit the enclosure portion 110 to completely surround the humidifier unit and the heating module 300. In the present invention, a part of the enclosure portion 110 is used to install the water level identification module 400, which can realize effective detection of the water level through the physical water level identification structure with less change to the original housing structure, and enable at least a part of the water level identification module 400 to be integrated with the enclosure portion 110, which is beneficial to control the structural size of the housing 100, create conditions for reducing the number of parts, and also help reduce material costs and parts costs.

[0082] The humidifier unit can generally be detachably loaded onto the respiratory assistance device. In order to realize the installation of the humidifier unit onto the housing 100 of the respiratory assistance device, a loading structure is provided on the housing 100 of the respiratory assistance device. The loading structure is used to guide the humidifier unit to be loaded and fixed to the housing 100. In a specific embodiment, please refer to Figure 2 and Figure 3The loading structure includes a loading chute 140, which is arranged on the side of the two second parts 112 of the enclosure part 110 close to each other. The end of the loading chute 140 away from the first part 111 of the enclosure part 110 forms a water tank loading port for the flange plate at the bottom of the humidifier unit to be pushed in the horizontal direction to enter the loading structure. The top of the breathing assistance device is also provided with a water tank unlocking button 200 corresponding to the water tank loading port. The water tank unlocking button 200 can move up and down. When loading the humidifier unit, the water tank unlocking button 200 is pressed down to expose the water tank loading port. After the humidifier unit is loaded in place, the water tank unlocking button 200 is reset upward under the action of the elastic member 600, closing the water tank loading port and preventing the humidifier unit from being easily withdrawn.

[0083] In one embodiment, at least part of the enclosure portion 110 forms a second curved surface. The second curved surface includes an inner curved surface located on the side of the enclosure portion 110 close to the center of curvature, and also includes an outer curved surface located on the side of the enclosure portion 110 facing away from the center of curvature. Figures 1 to 3 In one embodiment, the cross-sectional outer contour of the rear half of the enclosure portion 110 is semicircular, forming a second curved surface. Part of the second curved surface forms the above-mentioned loading structure, which is used to guide the humidifier unit to be loaded and fixed to the housing 100 along the installation direction.

[0084] In one embodiment, the enclosure portion 110 has a mounting portion, and the water level identification module 400 is mounted on the mounting portion and is located on a side of the enclosure portion 110 close to the humidifier unit. It should be noted that the mounting portion can be a mounting cavity 120, a mounting plane, or a mounting protrusion facing the humidifier unit. In a specific embodiment, please refer to Figure 2 and Figure 3 The enclosure 110 is provided with an installation cavity 120, and the installation cavity 120 has a loading port 121 for installing the water level identification module 400, and at least a part of the water level identification module 400 is installed in the installation cavity 120. The loading chute 140 on the top of the respiratory assistance device extends in the front-to-back direction, and its extension direction is the installation direction when the humidifier unit is installed on the enclosure 110. The loading structure can guide the humidifier unit to be loaded and fixed to the housing 100 along the installation direction. Based on the setting of the above-mentioned installation part, on the projection plane perpendicular to the installation direction, the projection of the water level identification module 400 and the projection of the enclosure 110 at least partially overlap, which also reflects the integration of the water level identification module 400 and the enclosure 110.

[0085] The water level recognition module 400 is used to recognize the water level in the humidifier unit. In a specific embodiment, please refer to Figure 4The water level identification module 400 includes a module panel 410 and a water level sensor 420. The water level sensor 420 is fixedly arranged on the side of the module panel 410 facing away from the humidifier unit. The water level identification module 400 has a first side and a second side that are opposite to each other. The side of the module panel 410 facing the humidifier unit is the first side of the water level identification module 400, and the outer contour of the module panel 410 facing away from the humidifier unit is the second side of the water level identification module 400. In addition, in some other embodiments, the water level identification module 400 can also be a closed integral part, for example, it is made by a molding process, and the components for realizing the water level sensing function are wrapped in the injection molded part; if the components for realizing the water level sensing function can meet the use scenarios of the respiratory assistance device, such as structural strength, wear resistance, etc., they can also be directly used as the water level identification module.

[0086] In one embodiment, at least a portion of the first side of the water level identification module 400 is adapted to the first curved surface of the humidifier unit, so as to directly fit in contact with the corresponding outer peripheral surface of the humidifier unit. At least a portion of the second side of the water level identification module 400 is adapted to the second curved surface, so as to reduce the space occupied by the water level identification module 400 on the enclosure 110. The above-mentioned "adaptation" refers to having complementary shapes, or having the same or close bending angles. For example, the shape of at least a portion of the first side of the water level identification module 400 can complement the first curved surface of the humidifier unit so as to fit in contact with the outer peripheral surface of the humidifier unit; and the bending angle (i.e., curvature) of the second side of the water level identification module 400 is consistent with the corresponding position of the enclosure 110, so that at least a portion of the second side can utilize the three-dimensional space occupied by the enclosure 110. The loading port 121 of the installation cavity 120 on the enclosure 110 for installing the water level recognition module 400 faces the humidifier unit. The water level recognition module 400 includes a water level sensor 420. The enclosure 110 covers the side of the water level sensor 420 facing away from the humidifier unit.

[0087] In order to facilitate structural design and improve structural aesthetics, in a specific embodiment, the first curved surface and the second curved surface have the same surface curvature, which is equivalent to the first curved surface and the second curved surface having the same central axis. Of course, in some other embodiments, the first curved surface and the second curved surface may also have their own central axes.

[0088] In the above embodiment, the side surfaces of the housing 100 and the enclosure 110 facing away from the humidifier unit are cylindrical. In one embodiment, the cross-sectional shape of the housing 100 may also be other shapes, such as a rounded rectangle, and the side of the enclosure facing away from the humidifier unit may also be a rounded rectangle. Correspondingly, the second side of the water level identification module 400 may also be other shapes that can be adapted to the shape of the enclosure 110, such as a plane shape. Of course, regardless of the shape of the enclosure 110, the water level identification module 400 can still be designed and manufactured according to the shape shown in the figure as long as it can match the enclosure 110.

[0089] Since the outer peripheral surface of the humidifier unit and the housing 100 is generally a cylindrical surface, in order to adapt to the water level detection of the humidifier unit, in a specific embodiment, the first side of the module panel 410 is in an arc shape, which can be consistent with the outer arc surface of most open water tanks on the market, and can fit very tightly, so as to improve the water level detection accuracy. The water level sensor 420 has a first surface and a second surface relative to each other, and the first surface is adapted to the first side of the water level recognition module 400. In some embodiments, the water level sensor 420 is roughly in an arc shape, and its first surface and second surface are both arc surfaces; at the same time, the first side of the module panel 410 is consistent with the shape of the first surface of the water level sensor 420, and the water level sensor 420 can be fixed on the module panel 410 by adhesive bonding, and there is no need to preset a gap between the water level sensor 420 and the module panel 410. For example, the gap between the two can be eliminated by applying glue to avoid the gap affecting the accurate detection of the water level sensor 420. In one embodiment, the first surface and the second surface have the same surface curvature, which can facilitate the design and manufacture of the water level recognition module 400.

[0090] The water level sensor 420 can also be fixedly connected to the module panel 410 in other ways, for example, by fasteners such as screws and rivets, or by snap-fitting with a snap-fit ​​structure. In addition, it can also be crimped and fixed by setting a pressure plate.

[0091] In one embodiment, the water level sensor 420 may be a capacitive sensor that uses a capacitive measurement principle. Measuring water level using a capacitive measurement principle is a prior art and will not be described in detail in the present invention. However, in the present invention, a capacitive sensor with an arc is used in a respiratory assistance device, which can be matched with a humidifier unit to achieve a higher water level detection accuracy, and conveniently integrates the water level identification module 400 into the enclosure portion 110 of the housing 100. Compared with other methods of measuring water levels using other measurement principles (such as optical measurement), capacitive sensors can measure water levels without modifying the humidifier unit, and can therefore be adapted to most third-party humidifier units on the market, increasing the overall versatility of the device.

[0092] Since the water level identification module 400 can be integrated with the shell of the respiratory assistance device, even if it is configured to be larger in size, it will not cause excessive space occupation and excessive structural size. Therefore, it can achieve a larger area coverage of the humidifier unit along the circumference of the humidifier unit, increase the contact area with the humidifier unit, and thus improve the detection tolerance (for example, there is dirt on a part of the outer peripheral surface of the humidifier unit), which is beneficial to avoid false alarms and ensure detection accuracy.

[0093] Since the humidifier unit is a detachable unit, the sizes of different humidifier units may be different, and the position of the humidifier unit after installation may not be able to be accurately controlled. Considering that whether the water level recognition module 400 and the humidifier unit are reliably attached will affect the water level detection accuracy, therefore, in one embodiment, the water level recognition module 400 is not simply fixedly installed on the enclosure portion 110, but can be loaded along the loading direction of the humidifier unit on the housing 100 (that is, the extension direction of the loading chute 140, that is, the water level recognition module 400 along the installation direction, which can be referred to Figure 1 Elastic floating in the front and back directions).

[0094] Specifically, in one embodiment, the water level recognition module 400 is movably arranged along the installation direction. To achieve the floating installation of the water level recognition module 400, please refer to Figure 4 The water level recognition module 400 includes a first guide structure 510, please refer to Figure 3 , the enclosure part 110 includes a second guide structure 520, and the first guide structure 510 and the second guide structure 520 are sleeved and matched along the moving direction of the water level identification module 400 to guide the water level identification module 400. The spacing direction of the first guide structure 510 and the second guide structure 520 in the circumferential direction of the enclosure part 110 corresponds to the longer side of the water level identification module 400, which can play a more stable guiding role for the water level identification module 400. Of course, in other embodiments, the number of guide structures can also be increased or decreased, for example, three guide structures are set at the left, middle and right, or only one guide structure is set in the middle of the left and right directions of the water level identification module 400, and an anti-rotation structure is set to prevent the water level identification module 400 from rotating.

[0095] The size of the water level identification module 400 in the horizontal direction perpendicular to the installation direction is larger than its size in the vertical direction. Due to the large manufacturing error or deformation in the direction with the larger size, in order to avoid the first guide structure 510 and the second guide structure 520 from getting stuck due to the size error, the matching clearance between the first guide structure 510 and the second guide structure 520 in the horizontal direction perpendicular to the installation direction is larger than the matching clearance in the vertical direction. In this way, even if the water level identification module 400 has a large manufacturing error or deformation in the direction with the larger size, the first guide structure 510 and the second guide structure 520 can also achieve better guidance, which is convenient for installation, so that the water level identification module 400 moves more smoothly, and the smooth operation of the water level identification module 400 can be ensured. It should be noted that the matching clearance is a general term in the mechanical field. For objects that are fitted together, the diameter difference between the hole and the object inserted into the hole is the matching clearance.

[0096] In a specific embodiment, please refer to Figure 3 and Figure 5 The first guide structure 510 on the water level identification module 400 is a guide column, and the second guide structure 520 on the enclosure portion 110 is a hollow column, and the hollow column forms a guide hole for the guide column to be inserted. Figure 3 and Figure 4 In the embodiment, the above-mentioned fitting clearance can be achieved by relying on the dimensional relationship between the guide column and the guide hole. For example, the left-right dimensions of the guide hole and the guide column can differ more greatly, so that the left-right fitting clearance between the guide hole and the guide column can be greater than the up-down fitting clearance.

[0097] In some other embodiments, the first guide structure 510 and the second guide structure 520 may also adopt other forms. For example, the first guide structure 510 adopts a hollow column, while the second guide structure 520 adopts a guide column; for example, one of the first guide structure 510 and the second guide structure 520 adopts a long guide protrusion extending along the installation direction of the water level identification module 400, and the other adopts a guide groove extending along the installation direction of the water level identification module 400.

[0098] On the basis that the water level recognition module 400 can move forward and backward, in order to achieve elastic floating so as to elastically abut against the outer peripheral surface of the humidifier unit, in one embodiment, please refer to Figure 4 and Figure 5The breathing assistance device includes an elastic push structure for applying a push force to the humidifier unit toward the water level identification module 400. In a specific embodiment, the elastic push structure is formed by an elastic member 600, and the elastic member 600 can be a coil spring. The coil spring is sleeved on the radial outside of the first guide structure 510 and the second guide structure 520. The first guide structure 510 and the second guide structure 520 can be relied on to a certain extent to avoid the spring from deforming laterally and outwardly when compressed, thereby affecting the elasticity of the elastic member 600, and ensuring stable elastic force output. In a specific embodiment, the elastic member 600 can also be other structural forms, such as a spring, an air spring, etc.

[0099] In order to improve the guiding reliability, a reinforcing rib plate 550 is provided on the radial outer side of the guide column as the first guiding structure 510, and the reinforcing rib plate 550 is connected between the cavity wall of the installation cavity 120 and the outer peripheral surface of the guide column, and / or, a reinforcing rib plate 550 is provided on the radial outer side of the hollow column as the second guiding structure 520, and the reinforcing rib plate 550 is connected between the side away from the humidifier unit and the outer peripheral surface of the guide column. Please refer to Figure 3 , the reinforcing rib plates 550 can be arranged in a cross shape.

[0100] Since the elastic member 600 such as a spring may be separated from the water level recognition module 400 and the humidifier unit, in order to facilitate assembly and improve reliability, in one embodiment, an elastic member fixing structure for fixing the elastic member 600 is provided on the water level recognition module 400 and / or the humidifier unit. Figure 4 , at least part of the reinforcing rib plate 550 is provided with an embedding groove 551, and the corresponding end of the coil spring can be snapped into the embedding groove 551 in the form of interference fit, so as to achieve a fixed connection with the water level identification module 400 and / or the humidifier unit. Of course, in other embodiments, the elastic member 600 can also be fixed by other structures, for example, the elastic member 600 can be adhesively fixed to the water level identification module 400 and / or the humidifier unit, and for another example, an elastic buckle can be provided to rely on the buckle to achieve the fixation of the elastic member 600.

[0101] Since the water level recognition module 400 is movable along the installation direction, please refer to Figure 3 and Figure 4 The enclosure portion 110 includes a third guide structure 530, and the water level identification module 400 includes a fourth guide structure 540. The third guide structure 530 and the fourth guide structure 540 are arranged in a vertical direction; wherein the third guide structure 530 and the fourth guide structure 540 are engaged with each other to guide the water level identification module 400, and the end of the third guide structure 530 close to the humidifier unit or the end of the fourth guide structure 540 away from the humidifier unit is a blind end, and the blind end is used to limit the movable travel of the water level identification module 400. Specifically, in one embodiment, please refer to Figure 3 The mounting cavity 120 on the enclosure portion 110 is provided with cavity wall guide grooves on both sides of the cavity wall along the circumference of the enclosure portion 110, and the cavity wall guide grooves form a third guide structure 530; at the same time, please refer to Figure 4 , module clamping protrusions are respectively provided on the sides of the module panel 410 of the water level identification module 400 along the circumferential direction of the enclosure part 110, and the module clamping protrusions can be embedded in the cavity wall guide groove, and are arranged in the vertical direction with the cavity wall guide groove to form a fourth guide structure 540. The cavity wall guide groove and the module clamping protrusion cooperate with each other to not only achieve guidance, but also the end of the cavity wall guide groove close to the humidifier unit as the third guide structure 530 is a blind end, which can limit the movement stroke of the module clamping, thereby preventing the water level identification module 400 from escaping from the installation cavity 120.

[0102] For other embodiments, please refer to Figure 5 and Figure 6 , the left and right sides of the installation cavity 120 can also penetrate to the circumferential sides of the enclosure part 110, but the side wall of the enclosure part 110 close to the humidifier unit forms a stop wall on the left and right sides of the installation cavity 120; and the water level recognition module 400 is provided with elastic arms on both sides in the left and right directions, and the elastic arms are provided with wedge-shaped protrusions 430, forming elastic buckles, which can prevent the water level recognition module 400 from escaping from the installation cavity 120. In summary, an anti-slip structure is provided between the water level recognition module 400 and the enclosure part 110 to prevent the water level recognition module 400 from escaping from the installation cavity 120 along the installation direction, which can improve the reliability of the product.

[0103] In order to detect the water level of the humidifier unit, in one embodiment, please refer to Figure 3 The water level recognition module 400 is connected with a cable, and the housing 100 is provided with a cable port 710 for the cable to pass through. The housing 100 includes a retaining wall 720 located on a side of the cable port 710 close to the humidifier unit, and the height of the retaining wall 720 is configured to be higher than the heating module 300 to prevent liquid from flowing into the cable port 710. The retaining wall 720 can not only protect the circuit in the respiratory assistance device, but also prevent the user from seeing the inside of the housing 100, which can also improve the aesthetics of the product.

[0104] In one embodiment, reference may be made to Figures 1 to 3The enclosure portion 110 includes a first portion 111 on which the water level identification module 400 is installed and a second portion 112 connected to the first portion 111 along the circumference of the shell 100. The first portion 111 of the enclosure portion 110 is used to install the water level identification module 400. In one embodiment, considering the effective detection of the water level, the height of the portion of the enclosure portion 110 for installing the water level identification module 400 from the bottom surface of the respiratory assistance device is higher than that of the other portions to meet the detection requirements of the water level in the humidifier unit. Of course, the increased height of the enclosure portion 110 will cause a certain degree of obstruction to the corresponding side of the humidifier unit, but at the same time it can provide a mounting base for the water level identification module 400, and can use the sensor to achieve higher water level detection accuracy. There is no need to separately set up a water level identification module 400 with a shell, and the structure is more compact, which is conducive to forming a more ample installation space for the water level identification module.

[0105] Relative to the heating module 300 disposed on the shell 100 and located at the bottom of the humidifier unit, the maximum height of the top of the first part 111 from the heating module 300 is a first height, and the maximum height of the top of the second part 112 from the heating module 300 is a second height, wherein the first height is greater than the second height; the height of the water level identification module 400 is greater than the second height and less than the first height.

[0106] In order to increase the aesthetics, in one embodiment, the enclosure portion 110 also has a transition portion 113 located between the first portion 111 and the second portion 112. The transition portion 113 connects the top of the first portion 111 and the top of the second portion 112 through a curved transition, thereby avoiding the formation of obvious steps on the shell surface. It should be noted that in some other embodiments, the entire enclosure portion 110 can also be set to a form with a flat top. Although the overall height of the enclosure portion 110 is relatively high, compared with the water level identification module 400 having a shell provided separately, it can still gain a larger installation space for the water level identification module.

[0107] The above-mentioned breathing assistance device (humidifier) ​​utilizes the enclosure part 110 to integrate the water level identification module 400. The water level identification module 400 is used to realize water level detection through a sensor, which can ensure the detection accuracy; at the same time, from the outside, there is no installation structure of the water level identification module 400 on the breathing assistance device, and there is no need for an installation hole for the water level identification module 400, which can ensure the integrity of the appearance structure of the breathing assistance device.

[0108] An embodiment of a breathing gas supply system in the present invention:

[0109] A breathing gas supply system comprises a gas generating device for outputting a gas flow, a gas pipeline, and a breathing assistance device in any of the above embodiments, wherein the gas generating device is connected to the breathing assistance device through the gas pipeline.

[0110] In one embodiment, the breathing assistance device is located on the upper side of the gas generating device, or the breathing assistance device is located on one side of the gas generating device in the horizontal direction and protrudes from the side of the gas generating device.

[0111] In a specific embodiment, please refer to Figure 7 The gas generating device can be the main body 900 of the oxygen therapy device, and the breathing assist device is integrated on the oxygen therapy device and used as a functional module of the oxygen therapy device. Similarly, the gas generating device is connected to the breathing assist device through a gas pipeline.

[0112] In order to ensure the stability of the humidifier unit and facilitate the arrangement of the enclosure part 110, preferably, the breathing assistance device is located at the bottom of the side of the gas generating device, and the water level identification module 400 is arranged on the side of the breathing assistance device close to the gas generating device. The enclosure part 110 and the shell 100 of the main part 900 can be an integral structure or a split structure; at the same time, a loading structure is provided on the shell 100 of the breathing assistance device, and the loading structure is used to guide the humidifier unit to be loaded and fixed to the shell 100. A water tank loading port is provided on the side of the breathing assistance device away from the gas generating device, and the water tank loading port is used for the humidifier unit to enter the loading structure. The above-mentioned loading structure can be consistent with the loading structure mentioned above, and the details will not be described in detail here. The top surface of the enclosure part 110 is an inclined surface, which gradually increases from the front side to the rear side of the breathing assistance device. Of course, in other embodiments, the enclosure part 110 can refer to Figure 1 As shown, it is divided into a first part 111, a second part 112 and a third part, or adopts other structural forms described above, such as a flat top form. Of course, it is also possible to Figure 1 The enclosure structure shown is set up as Figure 8 The structure shown.

[0113] In another specific embodiment, the gas generating device may be a ventilator, and the breathing assist device may be a humidifier, for example Figure 1 In the structure shown, the humidifier can be used in conjunction with the ventilator as an independent auxiliary device, and the two are connected by a gas pipeline to form a complete breathing gas supply system.

[0114] In another embodiment of a breathing assistance device of the present invention, the embodiment is Figure 1 The difference between the illustrated embodiment is that, in this embodiment, the second curved surface formed by the enclosure portion 110 on the shell 100 of the breathing assistance device may be ignored, as long as at least a portion of the second side of the water level identification module 400 can be installed in cooperation with the enclosure portion 110. For example, the water level identification module 400 can be fixed to the enclosure portion 110 by means of screws, gluing, etc., even if the shape does not match.

[0115] In another embodiment of a breathing assistance device of the present invention, Figure 1 The difference of the embodiment shown is that, in this embodiment, the first curved surface formed by at least part of the outer peripheral surface of the humidifier unit and the second curved surface formed by the enclosure part 110 on the housing 100 of the respiratory assistance device can be ignored. The water level recognition module 400 uses the housing 100 corresponding to the enclosure part 110 and can be installed on the enclosure part 110 in any way. The part of the enclosure part 110 where the water level recognition module 400 is installed has a higher height than the adjacent parts, so that there is enough space to accommodate the water level recognition module 400. Similarly, even if the shape does not match, the water level recognition module 400 can also be fixed to the enclosure part 110 and used to detect the water level in the humidifier unit.

[0116] Specifically, the enclosure portion 110 includes a first portion 111 on which the water level identification module 400 is installed and a second portion 112 connected to the first portion 111 along the circumference of the shell 100; the heating module 300 is arranged on the shell 100 and is located at the bottom of the humidifier unit, the maximum height of the top of the first portion 111 from the heating module 300 is a first height, and the maximum height of the top of the second portion 112 from the heating module 300 is a second height, wherein the first height is greater than the second height; the height of the water level identification module 400 is greater than the second height and less than the first height.

[0117] Of course, the enclosure portion 110 may have an installation portion, and the water level identification module 400 is installed on the installation portion and is located on a side of the enclosure portion 110 close to the humidifier unit; further, the enclosure portion 110 may be provided with an installation cavity 120, and the installation cavity 120 has an installation port 121 for installing the water level identification module 400, and at least a portion of the water level identification module 400 is installed in the installation cavity 120.

[0118] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A breathing assistance device for heating and humidifying a gas flow delivered to a user, characterized in that include: A humidifier unit having an inlet port and an outlet port, the humidifier unit being configured to receive a gas flow through the inlet port, heat water in the humidifier unit to heat and humidify the gas flow, and discharge the heated and humidified gas flow through the outlet port; the humidifier unit comprising an outer peripheral surface, at least a portion of which forms a first curved surface; a heating module, the heating module being used to provide thermal energy to the humidifier unit to heat water in the humidifier unit; A housing, wherein the housing has an enclosure portion, the enclosure portion is used to enclose the humidifier unit and the heating module, and at least a portion of the enclosure portion forms a second curved surface; And a water level identification module, which is installed on the enclosure part and is used to identify the water level in the humidifier unit. The water level identification module has a first side and a second side opposite to each other, at least a portion of the first side is adapted to the first curved surface, and at least a portion of the second side is adapted to the second curved surface.

2. The breathing assistance device according to claim 1, characterized in that The humidifier unit is installed to the enclosure portion along an installation direction; on a projection plane perpendicular to the installation direction, a projection of the water level identification module at least partially overlaps with a projection of the enclosure portion.

3. The breathing assistance device according to claim 1, characterized in that The enclosure portion has a mounting portion, and the water level identification module is mounted on the mounting portion and is located at a side of the enclosure portion close to the humidifier unit.

4. The breathing assistance device according to claim 1, characterized in that: The enclosure portion is provided with an installation cavity having an installation port for installing the water level identification module, and at least a portion of the water level identification module is installed in the installation cavity.

5. The breathing assistance device according to claim 4, characterized in that The loading port of the installation cavity faces the humidifier unit, the water level identification module includes a capacitive water level sensor, and the enclosure portion covers a side of the capacitive water level sensor that faces away from the humidifier unit.

6. The breathing assistance device according to claim 2, characterized in that: The humidifier unit is installed to the enclosure portion along the installation direction; a portion of the second curved surface forms a loading structure for guiding the humidifier unit to be loaded along the installation direction and fixed to the shell.

7. The breathing assistance device according to claim 1, characterized in that: The water level identification module comprises a module panel, and a side of the module panel facing the humidifier unit is a first side of the water level identification module, which is used to directly contact with the outer peripheral surface of the humidifier unit.

8. The breathing assistance device according to claim 7, characterized in that The water level identification module further includes a capacitive water level sensor having a first surface and a second surface opposite to each other, wherein the first surface is adapted to the first side.

9. The breathing assistance device according to claim 8, characterized in that The first surface and the second surface have the same surface curvature.

10. The breathing assistance device according to claim 8, characterized in that The capacitive water level sensor is fixed on the module panel by adhesive bonding.

11. The breathing assistance device according to claim 1, characterized in that: The enclosure part includes a first part on which the water level identification module is installed and a second part connected to the first part along the circumference of the shell, and at least part of the first part forms the second curved surface; the heating module is arranged on the shell and located at the bottom of the humidifier unit, the maximum height of the top of the first part from the heating module is a first height, and the maximum height of the top of the second part from the heating module is a second height, wherein the first height is greater than the second height; the height of the water level identification module is greater than the second height and less than the first height.

12. The breathing assistance device according to claim 11, characterized in that The top of the first part and the top of the second part are connected via a curved surface transition.

13. The breathing assistance device according to claim 2, characterized in that: The water level identification module is movably arranged along the installation direction; the size of the water level identification module in the horizontal direction perpendicular to the installation direction is larger than its size in the vertical direction, the water level identification module includes a first guide structure, and the enclosure part includes a second guide structure, the first guide structure and the second guide structure are socketed and matched along the movable direction of the water level identification module to realize the guidance of the water level identification module; wherein, the matching clearance between the first guide structure and the second guide structure in the horizontal direction perpendicular to the installation direction is larger than the matching clearance in the vertical direction.

14. The breathing assistance device according to claim 1 or 13, characterized in that: An elastic member is provided between the water level identification module and the housing, and the elastic member is used to apply a thrust force toward the water level identification module to the water level identification module.

15. The breathing assistance device according to claim 14, characterized in that The dimension of the water level identification module in a horizontal direction perpendicular to the installation direction is larger than its dimension in a vertical direction. The water level identification module includes a first guide structure, and the enclosure portion includes a second guide structure. The first guide structure and the second guide structure are sleeved together along the movable direction of the water level identification module to guide the water level identification module. The elastic member is a coil spring, and the coil spring is sleeved on the radial outside of the first guide structure and the second guide structure.

16. The breathing assistance device according to claim 1, characterized in that The housing includes an elastic pushing structure for applying a pushing force to the humidifier unit toward the water level identification module.

17. The breathing assistance device according to claim 2, characterized in that: The water level identification module is movably arranged along the installation direction; the enclosure part includes a third guide structure, and the water level identification module includes a fourth guide structure, and the third guide structure and the fourth guide structure are arranged in a vertical direction; wherein, the third guide structure and the fourth guide structure are snap-fitted together to realize the guidance of the water level identification module, and an end of the third guide structure close to the humidifier unit or an end of the fourth guide structure away from the humidifier unit is a blind end, and the blind end is used to limit the movable range of the water level identification module.

18. A breathing assistance device according to any one of claims 1 to 17, characterized in that: The first curved surface and the second curved surface have the same surface curvature.

19. A breathing assistance device according to any one of claims 1 to 17, characterized in that: The water level identification module is connected to a cable, and a cable passage is provided on the shell for the cable to pass through. The shell includes a retaining wall located on a side of the cable passage close to the humidifier unit, and the height of the retaining wall is configured to be higher than the heating module to prevent liquid from flowing into the cable passage.

20. A breathing gas supply system, characterized in that: The invention comprises a gas generating device for outputting a gas flow, a gas pipeline and the breathing assistance device according to any one of claims 1 to 19, wherein the gas generating device is connected to the breathing assistance device through the gas pipeline.

21. The breathing gas supply system according to claim 20, characterized in that The breathing assistance device is located on the upper side of the gas generating device, or the breathing assistance device is located on one side of the gas generating device in the horizontal direction and protrudes from the side surface of the gas generating device.

22. The breathing gas supply system of claim 20, wherein: The breathing assistance device is located at the bottom of the side of the gas generating device, the water level identification module is arranged on the side of the breathing assistance device close to the gas generating device, a loading structure is provided on the shell of the breathing assistance device, and the loading structure is used to guide the humidifier unit to be loaded and fixed to the shell, and a water tank loading port is provided on the side of the breathing assistance device away from the gas generating device, and the water tank loading port is for the humidifier unit to enter the loading structure.

23. A breathing assistance apparatus for heating and humidifying a flow of gas delivered to a user, characterized in that include: A humidifier unit having an inlet port and an outlet port, the humidifier unit being adapted to receive a gas flow through the inlet port, heat water inside the humidifier unit to heat and humidify the gas flow, and discharge the heated and humidified gas flow through the outlet port; the humidifier unit comprising an outer peripheral surface, at least a portion of which forms a first curved surface; a heating module, the heating module being used to provide thermal energy to the humidifier unit to heat water in the humidifier unit; A housing, wherein the housing has an enclosure portion, and the enclosure portion is used to enclose the periphery of the humidifier unit and the heating module; and a water level identification module mounted on the enclosure portion for identifying the water level in the humidifier unit, the water level identification module having a first side and a second side opposite to each other, at least a portion of the first side being adapted to the first curved surface, and at least a portion of the second side being mounted in cooperation with the enclosure portion; The enclosure portion is provided with an installation cavity having an installation port for installing the water level identification module, and at least a portion of the water level identification module is arranged in the installation cavity.

24. A breathing assistance apparatus for heating and humidifying a flow of gas delivered to a user, characterized in that include: a humidifier unit having an inlet port and an outlet port, the humidifier unit being adapted to receive a gas flow through the inlet port, heat water inside the humidifier unit to heat and humidify the gas flow, and discharge the heated and humidified gas flow through the outlet port; a heating module, the heating module being used to provide thermal energy to the humidifier unit to heat water in the humidifier unit; A housing, wherein the housing has an enclosure portion, and the enclosure portion is used to enclose the periphery of the humidifier unit and the heating module; and a water level identification module, which is mounted on the enclosure portion and is used to identify the water level in the humidifier unit; The enclosure part includes a first part on which the water level identification module is installed and a second part connected to the first part along the circumference of the shell; the heating module is arranged on the shell and located at the bottom of the humidifier unit, the maximum height of the top of the first part from the heating module is a first height, and the maximum height of the top of the second part from the heating module is a second height, wherein the first height is greater than the second height; the height of the water level identification module is greater than the second height and less than the first height.

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