Oxygen inlet module of breathing machine

Abstract

The utility model discloses a breathing machine oxygen inlet module which comprises a valve body assembly and an oxygen inlet connector, the valve body assembly comprises a valve seat, the valve seat is provided with an oxygen inlet and an oxygen outlet, the oxygen inlet connector is communicated with the oxygen inlet in a butt joint mode, the oxygen inlet module further comprises an air inlet filter element, and the oxygen inlet connector is provided with an inserting end in butt joint with the oxygen inlet. The air inlet filter element is detachably fixed to the inserting end so that the air inlet filter element can be detached from the oxygen inlet along with the inserting end. According to the oxygen valve, the inserting end of the oxygen inlet connector is connected with the oxygen inlet of the valve seat in an inserting mode and communicated with the oxygen inlet channel in the valve seat, and the other end of the oxygen inlet connector is used for being connected with an oxygen pipeline of oxygen production equipment. The air inlet filter element is detachably installed at the inserting end, so that when a user pulls the oxygen inlet connector out of the oxygen inlet, the air inlet filter element can be pulled out along with the inserting end, and therefore the air inlet filter element is exposed outside. At the moment, a user can easily complete mounting and dismounting of the air inlet filter element, the operation sight line and the operation space are wider, and the maintenance convenience of the oxygen inlet module is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to an oxygen supply module for a ventilator. Background Art

[0002] A ventilator generally includes an air intake module, an oxygen intake module and a mixing module. The air intake module is used to inhale external air, and the oxygen intake module is used to connect to the oxygen production equipment to introduce oxygen. The oxygen and air are then mixed in the mixing module and supplied to the patient's inhalation end by the fan.

[0003] The oxygen inlet module usually includes a shell and an oxygen connector. The oxygen connector is used to connect to the pipeline of the oxygen production equipment. The shell is integrated with a valve body for adjusting pressure or ratio, as well as an oxygen inlet and an oxygen outlet. The oxygen connector is plugged into the oxygen inlet, and the oxygen outlet is used to connect to the oxygen outlet pipeline to introduce oxygen into the mixing module.

[0004] In order to ensure the purity of oxygen, a filter element is also provided in the oxygen inlet channel of the shell to filter impurities in the oxygen output by the oxygen connector. As a consumable, the filter element needs to be taken out frequently for cleaning or replacement. In the prior art, the filter element is arranged inside the oxygen inlet channel of the shell. The removal method is to first pull out the oxygen connector from the oxygen inlet port, and then remove the filter element through the oxygen inlet port. The caliber of the oxygen inlet port is small, which limits the user's line of sight and the user's operating space. This makes it difficult to disassemble and install the filter element, and it is difficult for users to install and disassemble it by themselves, resulting in a poor user experience. Utility Model Content

[0005] The utility model provides an oxygen inlet module for a ventilator, so as to solve the problem that a filter element in an oxygen inlet channel of the oxygen inlet module is difficult to install and disassemble, and users are not easy to install and disassemble by themselves, which affects the use experience.

[0006] The technical solution adopted by the utility model is:

[0007] A ventilator oxygen inlet module comprises a valve body assembly and an oxygen inlet connector, wherein the valve body assembly comprises a valve seat, the valve seat has an oxygen inlet port and an oxygen outlet port, the oxygen inlet connector is connected to the oxygen inlet port, and the oxygen inlet module further comprises an air inlet filter element, the oxygen inlet connector has a plug-in end connected to the oxygen inlet port, and the air inlet filter element is detachably fixed to the plug-in end so that the air inlet filter element can be removed from the oxygen inlet port together with the plug-in end.

[0008] The ventilator oxygen supply module of the utility model also has the following additional technical features:

[0009] The plug-in end is provided with a fixing part, the air intake filter element is provided with a matching part matching with the fixing part, the air intake filter element extends into the plug-in end, or the air intake filter element is sleeved on the outer periphery of the plug-in end so that the fixing part and the matching part are matched and fixed.

[0010] The fixing part includes a first threaded section, and the mating part includes a second threaded section. The first threaded section and the second threaded section are fixedly mated; alternatively, the fixing part includes a first buckle, and the mating part includes a second buckle. The first buckle and the second buckle are snap-fitted and fixed.

[0011] The insertion end extends into the oxygen inlet. A seal is provided between the insertion end and the inner wall of the oxygen inlet.

[0012] The oxygen inlet joint is further provided with a connecting rib position, the valve seat is provided with a connecting port, and the oxygen inlet module further includes a fastener. The fastener passes through the connecting rib position and is fixedly connected to the connecting port.

[0013] The valve body assembly further includes a valve body disposed on the valve seat. The valve seat is provided with a pressure reducing chamber. The inlet of the valve body communicates with the oxygen inlet, and the outlet of the valve body communicates with the pressure reducing chamber.

[0014] An oxygen outlet channel communicating with the oxygen outlet is further provided inside the valve seat. The oxygen outlet channel communicates with the pressure reducing chamber. A first filter element and a second filter element are sequentially arranged in the oxygen outlet channel.

[0015] There is a diameter-expanded section between the first filter element and the second filter element. The cross-sectional area of the inlet end of the diameter-expanded section is smaller than the cross-sectional area of the outlet end of the diameter-expanded section.

[0016] The cross-sectional area of the diameter-expanded section gradually increases from the inlet end to the outlet end, so as to form a flow guiding transition surface on the surface of the diameter-expanded section.

[0017] The valve body assembly further includes a valve cover fixed to the valve seat. The valve seat is provided with a mating sunk groove. The mating sunk groove and the valve cover cooperate to form a pressure reducing chamber.

[0018] The valve body includes a pressure reducing valve and a proportional valve. The inlet of the pressure reducing valve communicates with the oxygen inlet, the outlet of the pressure reducing valve communicates with the inlet of the proportional valve, and the outlet of the proportional valve communicates with the pressure reducing chamber.

[0019] Due to the adoption of the above technical solutions, the beneficial effects obtained by the present utility model are as follows:

[0020] 1. In the present utility model, the insertion end of the oxygen inlet joint is inserted into the oxygen inlet of the valve seat, so as to communicate with the oxygen inlet channel inside the valve seat. The other end of the oxygen inlet joint is used to connect the oxygen pipeline of the oxygen generation device. The intake air filter element is detachably installed at the insertion end, so that when the user pulls out the oxygen inlet joint from the oxygen inlet, the intake air filter element can be pulled out together with the insertion end and thus exposed to the outside. At this time, the user can easily complete the installation and disassembly of the intake air filter element, and the operation sight and operation space are more open and not restricted, thereby further reducing the operation difficulty, improving the maintenance convenience of the oxygen inlet module, and making the use and maintenance more convenient.

[0021] 2. As a preferred embodiment of the present utility model, the insertion end is provided with a fixing portion, and the intake air filter element is provided with a cooperating portion that cooperates with the fixing portion. The fixing portion includes a first threaded section, and the cooperating portion includes a second threaded section. The first threaded section and the second threaded section are cooperatively fixed. The intake air filter element is screwed and fixed to the insertion end of the oxygen inlet joint by means of threaded cooperation, further simplifying the installation structure of the two, reducing the difficulty of assembly and disassembly, reducing the learning cost of users, and making it easier to operate. In addition, the threaded cooperation can ensure good sealing performance and prevent oxygen leakage at the connection between the two.

[0022] 3. As a preferred embodiment of the present utility model, the valve body assembly further includes a valve body disposed on the valve seat. The valve seat is provided with a decompression chamber. The inlet of the valve body communicates with the oxygen inlet, and the outlet of the valve body communicates with the decompression chamber. After oxygen enters the interior of the valve seat, it passes through the decompression or adjustment of the valve body and then enters the decompression chamber, further reducing the air pressure of the oxygen. During this process, not only the pressure of the oxygen is reduced, but also the flow rate of the oxygen is slowed down, so that it can be better mixed with air in the mixing module, ensuring the oxygen content in the gas inhaled by the patient. On the other hand, after the oxygen enters the decompression chamber, the air pressure decreases and the flow rate slows down, which can effectively reduce the noise generated by the oxygen flow and reduce the whistling sound generated during the high-speed flow of oxygen. It helps to achieve the silent design of the ventilator and improve the user experience of the patient.

[0023] 4. As a preferred embodiment of the present utility model, an oxygen outlet channel communicating with the oxygen outlet is further provided inside the valve seat. The oxygen outlet channel communicates with the decompression chamber. The oxygen outlet channel has a diameter-expanded section, and the cross-sectional area of the inlet end of the diameter-expanded section is smaller than the cross-sectional area of the outlet end of the diameter-expanded section. When oxygen flows through the oxygen outlet channel, it passes through the diameter-expanded section. Due to the change in the cross-sectional area inside the diameter-expanded section, the air pressure of the oxygen decreases again during the flow process, thereby further improving the decompression effect of the oxygen inlet module on oxygen and reducing the noise generated when oxygen flows inside the valve seat.

[0024] 5. As a preferred embodiment of the present utility model, the oxygen inlet module further includes a first filter element and a second filter element disposed in the oxygen outlet passage, and the diameter-expanded section is located between the first filter element and the second filter element. The diameter-expanded section being located between the first filter element and the second filter element causes the pressure reduction process of oxygen in the diameter-expanded section to occur after the oxygen passes through the first filter element and before reaching the second filter element. Thus, oxygen flows through the first filter element and the second filter element at different flow rates. Specifically, the flow rate of oxygen when flowing through the first filter element is relatively fast, and the first filter element plays a primary filtering role on oxygen, with a filtering accuracy lower than that of the second filter element. Oxygen can quickly pass through the first filter element to ensure the flow rate. The filtering accuracy of the second filter element is higher than that of the first filter element, and it performs fine filtering on oxygen. At this time, the flow rate of oxygen decreases after passing through the diameter-expanded section, enabling oxygen to be in full contact with the second filter element, extending the contact time, thereby improving the filtering effect, and also making the contact between oxygen and the second filter element more gentle, avoiding violent collisions between oxygen and the second filter element and generating noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present utility model and constitute a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0026] Figure 1 is a schematic structural diagram of the oxygen inlet module of the ventilator under an embodiment of the present utility model;

[0027] Figure 2 is a schematic structural diagram of the oxygen inlet joint and the air inlet filter element under an embodiment of the present utility model;

[0028] Figure 3 is Figure 2 a cross-sectional view of the oxygen inlet joint and the air inlet filter element in ;

[0029] Figure 4 is a cross-sectional view of the valve seat under an embodiment of the present utility model;

[0030] Figure 5 is a cross-sectional view of the valve seat under an embodiment of the present utility model from another perspective;

[0031] Figure 6 is Figure 5 an enlarged view of area A in ;

[0032] Figure 7 is a cross-sectional view of the valve seat under an embodiment of the present utility model from yet another perspective.

[0033] Wherein:

[0034] 1 Valve seat; 11 Oxygen inlet channel; 12 Oxygen outlet channel; 121 Diameter-expanded section; 122 Second diameter-expanded section; 123 First filter element; 124 Second filter element; 13 Connection port; 14 Pressure-reducing chamber; 141 Inlet; 142 Outlet; 15 Oxygen inlet; 16 First communication section; 17 Second communication section; 18 Third communication section;

[0035] 2 Oxygen inlet connector; 21 Insertion end; 211 First insertion section; 212 Second insertion section; 22 Connection rib position; 23 Sealing element; 24 Installation groove; 25 Insertion channel;

[0036] 3 Valve body; 31 Pressure-reducing valve; 32 Proportional valve;

[0037] 4 Valve cover;

[0038] 5 Intake air filter element; 51 First mating section; 52 Second mating section; 53 Sealing ring;

[0039] 6 Fastener;

[0040] 7 Pressure sensor;

[0041] 8 Flow sensor. Detailed implementation manner

[0042] In order to more clearly illustrate the overall concept of the present utility model, the following will be described in detail by way of examples in conjunction with the drawings of the specification.

[0043] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present utility model is not limited by the specific embodiments disclosed below.

[0044] In addition, in the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0045] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0046] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the descriptions with reference to terms such as "embodiment", "example", "an example", "illustration" or "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0047] As Figure 1 、 Figure 2 、 Figure 7 shown, a oxygen intake module of a ventilator includes a valve body 3 assembly and an oxygen intake joint 2. The valve body 3 assembly includes a valve seat 1. The valve seat 1 has an oxygen intake port 15 and an oxygen outlet. The oxygen intake joint 2 is in butt communication with the oxygen intake port 15. The oxygen intake module further includes an intake air filter element 5. The oxygen intake joint 2 has a plug-in end 21 for docking with the oxygen intake port 15. The intake air filter element 5 is detachably fixed to the plug-in end 21 so that the intake air filter element 5 can be removed from the oxygen intake port 15 together with the plug-in end 21.

[0048] In the present utility model, all components of the valve body 3 assembly are integrated on the valve seat 1, so that the oxygen intake module can be installed on the ventilator as a single and complete module, or removed from the ventilator, which is convenient for maintenance and repair. Moreover, when installing and disassembling, there is no need to dock or disassemble a large number of pipelines, reducing the problems of reduced reliability of pipeline connection and decreased sealing performance caused by frequent installation and disassembly of pipelines.

[0049] In addition, an oxygen channel extending from the oxygen intake port 15 to at least the oxygen outlet is provided inside the valve seat 1, so that the flow of oxygen is completely carried out inside the valve seat 1. This not only eliminates the need for additional pipelines, simplifies the structure, and avoids the problems of messy pipeline layout and easy entanglement with each other, but also can avoid the problem that external pipelines are prone to interference with other components.

[0050] In the present utility model, the insertion end 21 of the oxygen inlet joint 2 is inserted into the oxygen inlet 15 of the valve seat 1, thereby communicating with the oxygen inlet channel 11 inside the valve seat 1. The other end of the oxygen inlet joint 2 is used to connect the oxygen pipeline of the oxygen generation device. The intake air filter element 5 is detachably installed at the insertion end 21, so that when the user pulls out the oxygen inlet joint 2 from the oxygen inlet 15, as Figure 2 shown, the intake air filter element 5 can be pulled out together with the insertion end 21 and thus be exposed to the outside. At this time, the user can easily complete the installation and disassembly of the intake air filter element 5, and the operation line of sight and the operation space are more open and not restricted, thereby further reducing the operation difficulty, improving the maintenance convenience of the oxygen inlet module, and making the use and maintenance more convenient.

[0051] The present utility model does not limit the assembly method of the insertion end 21 and the intake air filter element 5. In a preferred embodiment, as Figure 2 , Figure 3 shown, the insertion end 21 is provided with a fixing portion, and the intake air filter element 5 is provided with a cooperating portion that cooperates with the fixing portion. The intake air filter element 5 extends into the insertion end 21, or the intake air filter element 5 is sleeved on the outer periphery of the insertion end 21 so that the fixing portion and the cooperating portion are fixedly combined.

[0052] In this embodiment, the intake air filter element 5 is inserted into the insertion end 21 or sleeved on the outside of the insertion end 21, so that the intake air filter element 5 and the oxygen inlet joint 2 have an overlapping section in the axial direction, improving the sealing performance at the connection between the two and preventing oxygen leakage.

[0053] In a specific embodiment, as Figure 3 shown, the intake air filter element 5 is inserted into the insertion end 21 and communicates with the channel inside the oxygen inlet joint 2.

[0054] Furthermore, as Figure 3 shown, a sealing ring 53 is provided between the intake air filter element 5 and the inner wall of the insertion end 21 to ensure the sealing performance at the connection.

[0055] Specifically, as Figure 3 shown, the insertion end 21 has a first insertion section 211 and a second insertion section 212 along the oxygen flow direction. The inner diameter of the first insertion section 211 is smaller than the inner diameter of the second insertion section 212. The intake air filter element 5 has a first cooperating section 51 that cooperates with the first insertion section 211 and a second cooperating section 52 that cooperates with the second insertion section 212. The outer diameter of the first cooperating section 51 is smaller than the outer diameter of the second cooperating section 52. The sealing ring 53 is provided at the step surface between the first cooperating section 51 and the second cooperating section 52.

[0056] One end of the oxygen inlet joint 2 located outside the valve seat 1 is internally provided with a stepped insertion channel 25 for insertion and cooperation with the oxygen pipeline of the oxygen generation device. The inner diameter of the insertion channel 25 decreases step by step in the oxygen flow direction, so that it can be inserted and cooperated with oxygen pipelines of different diameters, improving the adaptability of the oxygen inlet joint 2.

[0057] The structures of the fixing part and the mating part are not limited in this embodiment, and it includes but is not limited to the cases listed in the following embodiments:

[0058] Embodiment 1: In this embodiment, the fixing part includes a first threaded section, and the mating part includes a second threaded section. The first threaded section and the second threaded section are fixedly mated.

[0059] The intake air filter element 5 is screwed and fixed to the insertion end 21 of the oxygen inlet joint 2 by means of threaded mating, further simplifying the installation structure of the two, reducing the difficulty of installation and disassembly, reducing the learning cost of users, and making it easier to operate. In addition, the threaded mating method can ensure good sealing performance and avoid oxygen leakage at the connection between the two.

[0060] As Figure 3 shown, the inside of the insertion end 21 is a variable diameter structure, and the outer wall of the intake air filter element 5 is also a variable diameter structure. Among them, the first threaded section can be arranged on the large diameter section, or on the small diameter section, or the first threaded section can be arranged on both the large diameter section and the small diameter section. The second threaded section is correspondingly arranged on the large diameter section and / or the small diameter section of the intake air filter element 5 corresponding to the first threaded section, and is not limited here.

[0061] Embodiment 2: In this embodiment, the fixing part includes a first buckle, and the mating part includes a second buckle. The first buckle and the second buckle are fixedly buckled.

[0062] Fixing is achieved through buckle mating, which also makes the installation and disassembly of the intake air filter element 5 relatively simple and convenient, and the user operation is more rapid.

[0063] Of course, the intake air filter element 5 and the insertion end 21 can also be fixed by other methods, such as being connected by screws, etc., and are not limited here.

[0064] Preferably, as Figure 3 、 Figure 4 shown, the insertion end 21 extends into the oxygen inlet 15, and a sealing member 23 is arranged between the insertion end 21 and the inner wall of the oxygen inlet 15.

[0065] The setting of the sealing member 23, on the one hand, improves the sealing performance between the insertion end 21 and the inner wall of the oxygen inlet 15, avoiding oxygen leakage. On the other hand, the inner wall of the oxygen inlet 15 presses against the outer wall of the insertion end 21 to deform the sealing member 23, increasing the frictional resistance, and can also improve the insertion stability of the oxygen inlet interface, reducing the risk of the oxygen inlet interface slipping out of the oxygen inlet 15.

[0066] Specifically, as Figure 3 shown, at least one mounting groove 24 is provided on the outer wall of the plug-in end 21 at intervals along the axial direction, and the seals 23 are correspondingly arranged in the mounting grooves 24, so as to form multiple seals to ensure the sealing performance.

[0067] In a preferred embodiment, as Figure 3 、 Figure 4 shown, the oxygen inlet joint 2 is further provided with a connecting rib position 22, the valve seat 1 is provided with a connecting port 13, and the oxygen inlet module further includes a fastener 6. The fastener 6 passes through the connecting rib position 22 and is fixedly connected to the connecting port 13.

[0068] The oxygen inlet joint 2 is fixedly connected to the valve seat 1 through the fastener 6, so that the connection between the oxygen inlet joint 2 and the valve seat 1 is more stable, reducing the possibility of the oxygen inlet joint 2 falling off. Specifically, as Figure 4 shown, the connecting rib position 22 is arranged on the outer wall of the oxygen inlet joint 2 and is provided with a fixing hole. The outer surface of the valve seat 1 is provided with a connecting port 13, and the connecting rib position 22 and the valve seat 1 are tightly connected through a fastener 6 such as a screw.

[0069] When disassembling the oxygen inlet joint 2, first remove the fastener 6, unlock the oxygen inlet joint 2 from the valve seat 1, and then pull out the plug-in end 21 of the oxygen inlet joint 2 from the valve seat 1.

[0070] As a preferred embodiment of the present invention, as Figure 5 shown, the valve body 3 assembly further includes a valve body 3 provided on the valve seat 1. The valve seat 1 is provided with a decompression chamber 14. The inlet of the valve body 3 communicates with the oxygen inlet 15, and the outlet of the valve body 3 communicates with the decompression chamber 14.

[0071] Specifically, as Figure 1 、 Figure 5 、 Figure 7 shown, the valve body 3 includes a pressure reducing valve 31 and a proportional valve 32. The inlet of the pressure reducing valve 31 communicates with the oxygen inlet 15, the outlet of the pressure reducing valve 31 communicates with the inlet of the proportional valve 32, and the outlet of the proportional valve 32 communicates with the decompression chamber 14.

[0072] After the oxygen enters from the oxygen inlet 15, it first flows through the pressure reducing valve 31, and the air pressure is reduced under the regulation of the pressure reducing valve 31, and then passes through the proportional valve 32 for the regulation of proportion and flow rate. However, in actual use, the air flow needs to have a certain pressure to enable the proportional valve 32 to work normally. Therefore, although the oxygen is decompressed by the pressure reducing valve 31 before passing through the proportional valve 32, in order to ensure the normal operation of the proportional valve 32, the pressure reducing valve 31 cannot reduce the pressure of the oxygen too much. That is to say, after the oxygen flows through the pressure reducing valve 31 and the proportional valve 32, it still has a relatively large pressure.

[0073] Therefore, in this embodiment, a pressure reduction chamber 14 is provided downstream of the valve body 3. After the oxygen enters the inside of the valve seat 1, it enters the pressure reduction chamber 14 after being reduced in pressure or adjusted by the valve body 3. The pressure reduction chamber 14 has a relatively large volume compared to the oxygen flow channel, further reducing the air pressure of the oxygen. During this process, not only the pressure of the oxygen is reduced, but also the flow rate of the oxygen is slowed down, so that it can be better mixed with the air in the mixing module, ensuring the oxygen content in the gas inhaled by the patient. On the other hand, after the oxygen enters the pressure reduction chamber 14, the air pressure decreases and the flow rate slows down, which can also effectively reduce the noise generated by the oxygen flow and reduce the whistling sound emitted during the high-speed flow of the oxygen. This helps to achieve the silent design of the ventilator and improve the patient's use experience.

[0074] Specifically, as Figure 5 , Figure 7 shown, the oxygen channel includes a first connection section 16 connecting the oxygen inlet 15 and the inlet of the pressure reducing valve 31, a second connection section 17 connecting the outlet of the pressure reducing valve 31 and the inlet of the proportional valve 32, and a third connection section 18 connecting the outlet of the proportional valve 32 and the pressure reduction chamber 14.

[0075] It should be noted that the pressure reduction chamber 14 can be formed inside the valve seat 1 or formed by the cooperation of the valve seat 1 and other components. For example, in a preferred embodiment, as Figure 5 shown, the valve body 3 assembly further includes a valve cover 4 fixed to the valve seat 1. The valve seat 1 is provided with a mating sunk groove, and the mating sunk groove and the valve cover 4 cooperate to form the pressure reduction chamber 14.

[0076] Forming the pressure reduction chamber 14 by the cooperation of the valve cover 4 and the valve seat 1 makes the structure of the oxygen inlet module simpler. Specifically, as Figure 5 shown, the pressure reduction chamber 14 is located at the edge of the valve body 3. The pressure reduction chamber 14 has an inlet 141 communicating with the valve body 3 and an outlet 142 communicating with the oxygen outlet channel 12. The inlet 141 and the outlet 142 are located on the same side and are arranged at intervals to reasonably utilize the structure of the valve seat 1 and improve the structural compactness.

[0077] Furthermore, as Figure 5 , Figure 6 shown, an oxygen outlet channel 12 communicating with the oxygen outlet is further provided inside the valve seat 1. The oxygen outlet channel 12 communicates with the pressure reduction chamber 14. The oxygen outlet channel 12 has a diameter-expanded section 121, and the cross-sectional area of the inlet end of the diameter-expanded section 121 is smaller than the cross-sectional area of the outlet end of the diameter-expanded section 121.

[0078] When the oxygen flows through the diameter-expanded section 121 during the flow in the oxygen outlet channel 12, due to the change in the cross-sectional area in the diameter-expanded section 121, the air pressure of the oxygen decreases again during the flow process, thereby further improving the pressure reduction effect of the oxygen inlet module on the oxygen and reducing the noise generated when the oxygen flows inside the valve seat 1.

[0079] It should be noted that the structure of the diameter-expanding section 121 is not limited in this embodiment. In one embodiment, as Figure 6 shown, the cross-sectional area of the diameter-expanding section 121 gradually increases from the inlet end to the outlet end, so as to form a flow-guiding transition surface on the surface of the diameter-expanding section 121. The gradually increasing cross-sectional area of the diameter-expanding section 121 can form a flow-guiding transition surface on the inner wall, which can improve the guiding effect on oxygen and the oxygen flow efficiency. In another embodiment, the diameter-expanding section 121 has a stepped diameter change between the inlet end and the outlet end, so that the cross-sectional area increases.

[0080] Specifically, the flow-guiding transition surface can be the Figure 6 inclined surface shown in, or it can be an arc surface or other irregular curved surfaces, etc.

[0081] Furthermore, as Figure 6 shown, the oxygen inlet module further includes a first filter element 123 and a second filter element 124 disposed in the oxygen outlet passage 12, and the diameter-expanding section 121 is located between the first filter element 123 and the second filter element 124.

[0082] The diameter-expanding section 121 is located between the first filter element 123 and the second filter element 124, so that the pressure reduction process of oxygen in the diameter-expanding section 121 occurs after oxygen passes through the first filter element 123 and before reaching the second filter element 124. Thus, oxygen flows through the first filter element 123 and the second filter element 124 at different flow rates. Specifically, the flow rate of oxygen when flowing through the first filter element 123 is relatively fast, and the first filter element 123 plays a primary filtering role on oxygen, and the filtering accuracy is lower than that of the second filter element 124. Oxygen can quickly pass through the first filter element 123 to ensure the flow rate. The filtering accuracy of the second filter element 124 is higher than that of the first filter element 123, and it performs fine filtering on oxygen. At this time, the flow rate of oxygen decreases after passing through the diameter-expanding section 121, which can make oxygen fully contact with the second filter element 124, extend the contact time, thereby improving the filtering effect, and can also make the contact between oxygen and the second filter element 124 more gentle, avoiding violent collisions between oxygen and the second filter element 124 and generating noise.

[0083] The first filter element 123 and the second filter element 124, on the one hand, enable oxygen to pass through the micropores, playing a role in combing the air flow and reducing the signal noise of the flow sensor, and on the other hand, reducing the pneumatic noise of the output oxygen.

[0084] Specifically, as Figure 6 shown, a second diameter-expanding section 122 is further provided between the outlet 142 of the decompression chamber 14 and the first filter element 123 in the oxygen outlet passage 12, and the cross-sectional area of the second diameter-expanding section 122 gradually increases from the outlet 142 of the decompression chamber 14 to the first filter element 123.

[0085] Among them, the internal structure of the valve seat 1 can be processed to form an enlarged diameter section 121, or the enlarged diameter section 121 can be arranged on a component separated from the valve seat 1, and the component can be fixed in the oxygen outlet channel 12 of the valve seat 1 through subsequent assembly, which is not limited herein.

[0086] Specifically, as Figure 1 , Figure 4 shown, the oxygen inlet module further includes a pressure sensor 7 and a flow sensor 8 arranged in the oxygen outlet channel 12.

[0087] It can be understood that in the present utility model, on the path of oxygen flow, the intake air filter element 5 filters the oxygen source to ensure the cleanliness of the oxygen source; then the pressure reducing valve 31 controls the gas source pressure of the oxygen source to facilitate the realization of the oxygen mixing accuracy; then the pressure sensor 7 monitors the oxygen pressure after decompression in real time; then the proportional valve 32 controls the magnitude of the oxygen flow output to control the output oxygen concentration. The flow sensor 8 is used to detect the oxygen flow and output a flow signal to facilitate the control of the software algorithm.

[0088] In the present utility model, the parts not described can be realized by adopting or referring to the existing technologies.

[0089] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key point of each embodiment is to illustrate the differences from other embodiments.

[0090] The above are only the embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the scope of the claims of the present utility model.

Claims

1. A ventilator oxygen inlet module, comprising a valve body assembly and an oxygen inlet connector, wherein the valve body assembly comprises a valve seat, the valve seat has an oxygen inlet and an oxygen outlet, the oxygen inlet connector is connected to the oxygen inlet, and is characterized in that: The oxygen inlet module also includes an air inlet filter element. The oxygen inlet connector has a plug-in end that docks with the oxygen inlet port. The air inlet filter element is detachably fixed to the plug-in end so that the air inlet filter element can be removed from the oxygen inlet port together with the plug-in end.

2. The ventilator oxygen supply module according to claim 1, characterized in that: The plug-in end is provided with a fixing portion, the air intake filter element is provided with a matching portion matching with the fixing portion, the air intake filter element extends into the interior of the plug-in end, or the air intake filter element is sleeved on the outer periphery of the plug-in end so that the fixing portion and the matching portion are matched and fixed.

3. The ventilator oxygen supply module according to claim 2, characterized in that: The fixing portion includes a first thread segment, the matching portion includes a second thread segment, and the first thread segment and the second thread segment are matched and fixed; or, The fixing portion includes a first buckle, the matching portion includes a second buckle, and the first buckle and the second buckle are buckled and fixed.

4. The ventilator oxygen supply module according to claim 1, characterized in that: The plug-in end extends into the interior of the oxygen inlet, and a sealing member is arranged between the plug-in end and the inner wall of the oxygen inlet.

5. The ventilator oxygen supply module according to claim 1 or 4, characterized in that: The oxygen inlet joint is further provided with a connection rib, the valve seat is provided with a connection port, and the oxygen inlet module further comprises a fastener, which passes through the connection rib and is fixedly connected to the connection port.

6. The ventilator oxygen supply module according to claim 1, characterized in that: The valve body assembly further comprises a valve body arranged on the valve seat, the valve seat is provided with a decompression chamber, the inlet of the valve body is connected to the oxygen inlet, and the outlet of the valve body is connected to the decompression chamber.

7. The ventilator oxygen supply module according to claim 6, characterized in that: An oxygen outlet channel communicating with the oxygen outlet is also provided inside the valve seat, the oxygen outlet channel is communicated with the decompression chamber, and a first filter element and a second filter element are sequentially provided inside the oxygen outlet channel.

8. The ventilator oxygen supply module according to claim 7, characterized in that: An expanded diameter section is provided between the first filter element and the second filter element, and a cross-sectional area of ​​an inlet end of the expanded diameter section is smaller than a cross-sectional area of ​​an outlet end of the expanded diameter section.

9. The ventilator oxygen supply module according to claim 8, characterized in that: The cross-sectional area of ​​the diameter expansion section gradually increases from the inlet end to the outlet end, so as to form a flow guiding transition surface on the surface of the diameter expansion section.

10. The oxygen supply module for a ventilator according to claim 6, characterized in that: The valve body assembly further comprises a valve cover fixed to the valve seat, the valve seat is provided with a matching recessed groove, and the matching recessed groove cooperates with the valve cover to form the decompression chamber.

11. The oxygen supply module for a ventilator according to claim 6, characterized in that: The valve body comprises a pressure reducing valve and a proportional valve, the inlet of the pressure reducing valve is communicated with the oxygen inlet, the outlet of the pressure reducing valve is communicated with the inlet of the proportional valve, and the outlet of the proportional valve is communicated with the pressure reducing chamber.

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