APL valve assembly, pressure reducing valve, and anesthesia machine

Abstract

The present disclosure provides an APL valve assembly, a pressure reducing valve and an anesthesia machine, the APL valve assembly comprising: a solenoid valve, a primary pressure reducing valve, a secondary pressure reducing valve and a switching assembly connected in sequence; the inlet of the solenoid valve is communicated with an oxygen source of the anesthesia machine; the solenoid valve is closed when powered on and opened when powered off; the switching assembly is fixedly connected with an anesthetic gas circuit device, the switching assembly is provided with a working cavity, a discharge cavity and a switching piece, the inlet of the switching assembly, the working cavity and the discharge cavity are connected in sequence; the anesthetic gas circuit device is provided with a circuit cavity, a first waste gas discharge cavity, a second waste gas discharge cavity communicated with the first waste gas discharge cavity, the working cavity and the second waste gas discharge cavity are communicated; the switching piece is configured to: close the circuit cavity when the pressure in the working cavity is greater than the pressure in the circuit cavity, open the circuit cavity when the pressure in the working cavity is not greater than the pressure in the circuit cavity, and the circuit cavity and the first waste gas discharge cavity are communicated. The APL valve assembly is automatically closed when powered on and automatically opened when powered off, thereby reducing the workload of medical staff.

Description

Technical Field

[0001] This disclosure relates to the field of medical device technology, and in particular to an APL valve assembly, a pressure reducing valve, and an anesthesia machine. Background Technology

[0002] The gas outlet of the anesthesia machine forms a circuit with the user's airway, called the anesthesia breathing circuit. The APL valve (Adjustable Pressure Limiting valve) on the anesthesia machine is a safety valve that limits the pressure of the anesthesia breathing circuit and is mainly used when the anesthesia machine is powered off.

[0003] The APL valve primarily sets the pressure by controlling the compression of an elastic element. The elastic element applies pressure to the valve plate, which seals the circuit cavity of the anesthetic gas circuit device, which is connected in series in the anesthetic breathing circuit. If the pressure within the anesthetic breathing circuit exceeds the APL set value, the gas in the circuit will push open the valve plate to release waste gas.

[0004] When the anesthesia machine is powered on, the APL valve needs to be manually closed; if the anesthesia machine suddenly loses power, the APL valve also needs to be manually operated. This increases the workload of medical staff. Summary of the Invention

[0005] In view of this, the purpose of this disclosure is to provide an APL valve assembly, a pressure reducing valve, and an anesthesia machine. The APL valve assembly can automatically close when the anesthesia machine is powered on and automatically open when the anesthesia machine is powered off, without the need for manual operation, thus reducing the workload of medical staff.

[0006] In a first aspect, this disclosure provides an APL valve assembly, comprising: a solenoid valve, a primary pressure reducing valve, a secondary pressure reducing valve, and a switching assembly; wherein the outlet of the solenoid valve, the primary pressure reducing valve, the secondary pressure reducing valve, and the inlet of the switching assembly are sequentially connected, and the inlet of the solenoid valve is used to connect to the oxygen source of the anesthesia machine; the solenoid valve is in a closed state when energized and in an open state when de-energized; the switching assembly is used to be fixedly connected to an anesthetic gas circuit device, and the switching assembly is provided with a working chamber, a discharge chamber, and a switching element, and the inlet of the switching assembly, the working chamber, and the discharge chamber are sequentially connected; the anesthetic gas circuit device is provided with a circuit cavity, a first waste gas discharge chamber, and a second waste gas discharge chamber connected to the first waste gas discharge chamber, and the working chamber is used to connect to the second waste gas discharge chamber; the switching element is configured to: close the circuit cavity when the pressure in the working chamber is greater than the pressure in the circuit cavity; and open the circuit cavity when the pressure in the working chamber is not greater than the pressure in the circuit cavity, so that the circuit cavity and the first waste gas discharge chamber are connected.

[0007] In some embodiments, the secondary pressure reducing valve includes: a valve body having an inlet, a first cavity, a second cavity, and an outlet sequentially connected; a valve cap being axially fixed to the valve body and rotatably disposed on the valve body about the axial direction; a connecting post being threadedly engaged with the valve body and circumferentially fixed to the valve cap; and a valve core assembly being connected to the connecting post via an elastic element capable of axial extension and retraction; wherein a first diaphragm is disposed within the valve body, and the first diaphragm, the valve body, and the valve core assembly form a third cavity; the third cavity communicates with the second cavity; the valve core assembly is fixedly connected to the first diaphragm, the valve core of the valve core assembly is located within the first cavity, a first sealing element is disposed at the communication point between the first cavity and the second cavity, the valve core can abut against the first sealing element to separate the first cavity and the second cavity, and the valve core can separate from the first sealing element to allow communication between the first cavity and the second cavity.

[0008] In some embodiments, the valve body is provided with a connecting hole that connects a third cavity and a second cavity; radially, the connecting hole is located on one side of the valve core assembly.

[0009] In some embodiments, a limiting member is provided in the first cavity; when the valve core and the first seal are separated, the limiting member can abut against the valve core assembly in the axial direction.

[0010] In some embodiments, one of the valve body and the valve cap is provided with a first groove, and the other is provided with a latch, the latch being located within the first groove, and the latch and the first groove abutting in the axial direction; in the radial direction, there is a gap between the latch and the first groove; and / or, one of the connecting column and the valve cap is provided with a second groove, and the other is provided with a protrusion, the protrusion being located within the second groove, and the protrusion and the second groove abutting in the circumferential direction.

[0011] In some embodiments, the valve body includes a mounting base, a first valve seat, a second valve seat, a mounting post, and a third valve seat; wherein the mounting base, the first valve seat, the second valve seat, and the third valve seat are sequentially distributed along the axial direction and fixedly connected; the valve cap and the mounting base are relatively fixed in the axial direction, and the valve cap is rotatably disposed on the mounting base about the axial direction; the mounting base is sleeved on the connecting post, and the connecting post and the mounting base are threadedly engaged; a portion of the valve core assembly and the elastic element are located within the mounting base; a portion of the first diaphragm is sandwiched between the first valve seat and the second valve seat; the second valve seat, the first diaphragm, the mounting post, and the valve core assembly form a sealed third cavity; the mounting post is disposed within the second valve seat, and the mounting post, the valve core assembly, and the second valve seat form a second cavity; a portion of the second valve seat is located within the third valve seat, and the third valve seat, the second valve seat, the valve core, and the first sealing element form a first cavity; both the air inlet and the air outlet are disposed on the third valve seat.

[0012] In some embodiments, the valve core assembly includes a first pressure member, a second pressure member, a third pressure member, a valve stem, and a valve core; wherein one end of the first pressure member abuts against an elastic member in the axial direction, the second pressure member is fixedly connected to the first pressure member, the third pressure member abuts against the second pressure member, the third pressure member is fixedly connected to the valve stem, and the valve core is fixedly connected to the valve stem; in the axial direction, the third pressure member is located on the side of the first diaphragm away from the third cavity; the valve stem extends axially and passes through the first diaphragm, the third cavity, and the second cavity, with a portion of the valve stem located within the first cavity; both the third pressure member and the valve stem are sealed to the first diaphragm.

[0013] In some embodiments, the valve core and valve stem are either an integral structure or separate structures.

[0014] In some embodiments, the circumferential outer wall of the end where the valve body is connected to the valve cap is provided with a pressure scale value, and the valve cap is provided with a pressure indicator that cooperates with the pressure scale value; and / or, the first seal is a star-shaped sealing ring; and / or, an inlet quick-connect fitting is provided at the inlet and an outlet quick-connect fitting is provided at the outlet; and / or, the output pressure range of the secondary pressure reducing valve is 0-10 kPa.

[0015] In some embodiments, the switching assembly includes a pressure shell, an inlet of which is disposed on the pressure shell, the pressure shell being fixedly connected to the housing of the anesthetic gas circuit device, and a switching element being pressed between the pressure shell and the housing. A portion of the pressure shell and the switching element form a working chamber, and a portion of the pressure shell and a portion of the switching element are used to form the discharge chamber with the housing. The working chamber communicates with the discharge chamber and the second waste gas discharge chamber; and / or, the switching element is a second diaphragm; and / or, a secondary pressure reducing valve is disposed on the anesthesia machine housing of the anesthesia machine; and / or, an inlet quick-connect connector is provided at the inlet of the switching assembly.

[0016] In some embodiments, the pressure shell includes an outer shell and a partition disposed within the outer shell. The inner cavity of the outer shell is divided into a first sub-cavity and a second sub-cavity by the partition. The partition is provided with a through hole that connects the first sub-cavity and the second sub-cavity. The switching member and the first sub-cavity form a working cavity. The second sub-cavity, a portion of the switching member, and the shell form a discharge cavity. The partition and the switching member are pressed together.

[0017] In a second aspect, this disclosure provides an anesthesia machine, which includes: the APL valve assembly described in any of the preceding claims.

[0018] Thirdly, this disclosure provides a pressure reducing valve for use in an APL valve assembly. The pressure reducing valve includes: a valve body having an inlet, a first cavity, a second cavity, and an outlet sequentially connected; a valve cap being axially fixed to the valve body and rotatably disposed on the valve body about the axial direction; a connecting post being threadedly engaged with the valve body and circumferentially fixed to the valve cap; and a valve core assembly being connected to the connecting post via an elastic element capable of axial extension and retraction. A first diaphragm is disposed within the valve body, and the first diaphragm, the valve body, and the valve core assembly form a third cavity, which is connected to a second cavity. The valve core assembly is fixedly connected to the first diaphragm, and the valve core of the valve core assembly is located within the first cavity. A first sealing element is disposed at the connection between the first cavity and the second cavity, allowing the valve core to abut against the first sealing element to separate the first cavity and the second cavity, and allowing the valve core to separate from the first sealing element to allow the first cavity and the second cavity to connect.

[0019] In some embodiments, the valve body includes a mounting base, a first valve seat, a second valve seat, a mounting post, and a third valve seat; wherein the mounting base, the first valve seat, the second valve seat, and the third valve seat are sequentially distributed along the axial direction and fixedly connected; the valve cap and the mounting base are relatively fixed in the axial direction, and the valve cap is rotatably disposed on the mounting base about the axial direction; the mounting base is sleeved on the connecting post, and the connecting post and the mounting base are threadedly engaged; a portion of the valve core assembly and the elastic element are located within the mounting base; a portion of the first diaphragm is sandwiched between the first valve seat and the second valve seat; the second valve seat, the first diaphragm, the mounting post, and the valve core assembly form a sealed third cavity; the mounting post is disposed within the second valve seat, and the mounting post, the valve core assembly, and the second valve seat form a second cavity; a portion of the second valve seat is located within the third valve seat, and the third valve seat, the second valve seat, the valve core, and the first sealing element form a first cavity; both the air inlet and the air outlet are disposed on the third valve seat.

[0020] In some embodiments, the valve core assembly includes a first pressure member, a second pressure member, a third pressure member, a valve stem, and a valve core; wherein one end of the first pressure member abuts against an elastic member in the axial direction, the second pressure member is fixedly connected to the first pressure member, the third pressure member abuts against the second pressure member, the third pressure member is fixedly connected to the valve stem, and the valve core is fixedly connected to the valve stem; in the axial direction, the third pressure member is located on the side of the first diaphragm away from the third cavity; the valve stem extends axially and passes through the first diaphragm, the third cavity, and the second cavity, with a portion of the valve stem located within the first cavity; both the third pressure member and the valve stem are sealed to the first diaphragm.

[0021] The APL valve assembly provided in this embodiment can automatically close when the anesthesia machine is powered on and automatically open when the anesthesia machine is powered off, without the need for manual operation, effectively reducing the workload of medical staff.

[0022] The technical features mentioned above, as well as those shown individually in the accompanying drawings, can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the APL valve assembly provided in an embodiment of this disclosure; Figure 2 A schematic diagram showing the connection of the APL valve assembly, oxygen source, and anesthetic gas circuit device provided in an embodiment of this disclosure; Figure 3 A schematic diagram showing the connection between the switching component of the APL valve assembly and the anesthetic gas circuit device provided in the embodiments of this disclosure; Figure 4 for Figure 3 The front view of the structure shown; Figure 5 for Figure 4 Sectional view along axis AA; Figure 6 A schematic diagram of the structure of the switching element shut-off circuit cavity of the APL valve assembly provided in this embodiment of the disclosure; Figure 7 A schematic diagram of the secondary pressure reducing valve of the APL valve assembly provided in this embodiment of the present disclosure in the closed state; Figure 8 for Figure 7 A magnified view of part B in the middle section; Figure 9 for Figure 7 A magnified view of part C in the middle; Figure 10 A schematic diagram of the secondary pressure reducing valve of the APL valve assembly provided in this embodiment of the present disclosure in the open state; Figure 11 for Figure 10 A magnified view of part D in the middle.

[0025] The annotations in the attached figures are explained as follows: 100-APL valve assembly; 11-First stage pressure reducing valve; 12-Second stage pressure reducing valve; 12a-Pressure reducing valve; 121-Valve body; 1201-Inlet; 1202-Outlet; 1203-First chamber; 1204-Second chamber; 1205-Third chamber; 1206-Connecting hole; 1211-Mounting base; 12111-First slot; 12112-Base plate; 1212-First valve seat; 1213-Second valve seat; 1214-Mounting post; 1215-Third valve seat; 12151-Mounting hole; 1216-Inlet quick-connect fitting; 1217-Outlet quick-connect fitting; 122-First diaphragm; 123-Valve cap; 1231-Snap-on; 124-Connecting post; 124 1-Receiving groove, 1242-Protrusion, 125-Valve core assembly, 1251-First pressing element, 1252-Second pressing element, 1253-Third pressing element, 1254-Valve stem, 1255-Valve core, 126-Elastic element, 127-First sealing element, 128-Limiting element, 1281-Limiting groove, 129-Second sealing element, 1210a-Third sealing element, 1210b-Fourth sealing element; 13-Switching assembly, 131-Pressure shell, 1311-Outer shell, 1312-Partition plate, 13121-Through hole, 132-Inlet quick connector, 133-Switching element, 134-First chamber, 135-Second chamber; 01-Working chamber, 02-Discharge chamber; 14-Solenoid valve; 200-Oxygen source; 300 - Anesthetic gas circuit device, 31 - Housing, 32 - Circuit cavity, 33 - First exhaust gas discharge cavity, 34 - Second exhaust gas discharge cavity. Detailed Implementation

[0026] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments.

[0027] In the description of the embodiments of this disclosure, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature.

[0028] In the description of the embodiments disclosed herein, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, "linking" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. "Rotary connection" refers to a connection where the two parts can rotate relative to each other after connection. "Sliding connection" refers to a connection where the two parts can slide relative to each other after connection.

[0029] The directional terms used in the embodiments of this disclosure, such as "inner" and "outer," are merely for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this disclosure, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure. Furthermore, unless otherwise stated in this disclosure, "a plurality of" refers to two or more.

[0030] In the description of embodiments of this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0031] In the description of the embodiments disclosed herein, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0032] The terms "parallel" and "perpendicular" used in this disclosure refer to "basically parallel" and "basically perpendicular" in actual operation. "Basically parallel" can be understood as parallelism with a certain degree of error, and similarly, "basically perpendicular" can be understood as perpendicularity with a certain degree of error.

[0033] This disclosure provides an APL valve assembly for an anesthesia machine that can automatically close when the anesthesia machine is powered on and automatically open when the anesthesia machine suddenly loses power, eliminating the need for manual operation and reducing the workload of medical staff.

[0034] like Figure 1 As shown, the APL valve assembly 100 provided in this embodiment includes: a solenoid valve 14, a primary pressure reducing valve 11, a secondary pressure reducing valve 12, and a switching assembly 13.

[0035] like Figure 2 As shown, the inlet of the solenoid valve 14 can be connected to the oxygen source 200 of the anesthesia machine via a pipeline or other connecting parts. The pressure of the oxygen output from the oxygen source 200 is within a first set range, for example, the first set range is 200 kPa-300 kPa.

[0036] The outlet of solenoid valve 14, the first-stage pressure reducing valve 11, the second-stage pressure reducing valve 12, and the inlet of switching assembly 13 are connected in sequence. Specifically, the outlet of solenoid valve 14 is connected to the inlet of the first-stage pressure reducing valve 11. The outlet of the first-stage pressure reducing valve 11 can be connected to the air inlet 1201 of the second-stage pressure reducing valve 12 through a pipeline or other connecting parts. The air outlet 1202 of the second-stage pressure reducing valve 12 can be connected to the inlet of switching assembly 13 through a pipeline or other connecting parts.

[0037] Solenoid valve 14 is closed when energized and open when de-energized. Therefore, solenoid valve 14 can be referred to as a normally open solenoid valve.

[0038] The first-stage pressure reducing valve 11 is used to reduce the pressure of the oxygen output from the oxygen source 200 for the first time, and the second-stage pressure reducing valve 12 is used to reduce the pressure of the oxygen for the second time.

[0039] For example, the maximum input pressure of the primary pressure reducing valve 11 can be 1 MPa, and the maximum output pressure can be 0.4 MPa. The primary pressure reducing valve 11 reduces the pressure of oxygen output from the oxygen source 200 to 30 kPa-50 kPa. The input pressure range of the secondary pressure reducing valve 12 can be 30 kPa-50 kPa, and the output pressure range can be 0-10 kPa, to meet the needs of the anesthesia machine. For example, the secondary pressure reducing valve 12 reduces the pressure of oxygen to 6 kPa.

[0040] The switching component 13 is used for fixed connection with the anesthetic gas circuit device 300. For example, Figure 3 As shown, the switching component 13 can be fixed to the housing 31 of the anesthetic gas circuit device 300 by bolts.

[0041] like Figure 4 and Figure 5 As shown, the switching assembly 13 is provided with a working chamber 01, a discharge chamber 02, and a switching element 133. The inlet, working chamber 01, and discharge chamber 02 of the switching assembly 13 are connected sequentially.

[0042] The anesthetic gas circuit device 300 is provided with a circuit cavity 32, a first waste gas discharge cavity 33, and a second waste gas discharge cavity 34. The second waste gas discharge cavity 34 is connected to the first waste gas discharge cavity 33, and the working cavity 01 of the switching component 13 is used to connect to the second waste gas discharge cavity 34; the second waste gas discharge cavity 34 is used to connect to the waste gas collection device.

[0043] The switching element 133 is disposed between the working chamber 01 and the loop chamber 32. The switching element 133 is configured to: close the loop chamber 32 when the pressure in the working chamber 01 is greater than the pressure in the loop chamber 32; and open the loop chamber 32 when the pressure in the working chamber 01 is not greater than the pressure in the loop chamber 32, so that the loop chamber 32 and the first exhaust gas discharge chamber 33 are connected.

[0044] For example, the outlet end of the loop cavity 32 is provided with a boss, which surrounds the periphery of the outlet of the loop cavity 32. The switching member 133 can be pressed onto the boss under pressure to close the loop cavity 32.

[0045] It should be noted that after the switching element 133 closes the circuit cavity 32, the circuit cavity 32 is in a closed state, and the closed circuit cavity 32 is not connected to the first exhaust gas discharge cavity 33; after the switching element 133 opens the circuit cavity 32, the circuit cavity 32 is in an open state, and the open circuit cavity 32 is connected to the first exhaust gas discharge cavity 33. Since the second exhaust gas discharge cavity 34 is connected to the first exhaust gas discharge cavity 33, the open circuit cavity 32 is connected to the first exhaust gas discharge cavity 33 and the second exhaust gas discharge cavity 34.

[0046] The aforementioned APL valve assembly 100 is used in an anesthesia machine. When the anesthesia machine is powered off, the solenoid valve 14 is de-energized and opened. The gas from the oxygen source 200, after being depressurized by the primary pressure reducing valve 11 and the secondary pressure reducing valve 12, enters the working chamber 01. When the pressure in the working chamber 01 is greater than the pressure in the circuit chamber 32, such as... Figure 6 As shown, the switching element 133 closes the outlet of the loop cavity 32 under the action of pressure difference, preventing the loop gas from entering the second exhaust cavity 34 through the first exhaust cavity 33, thereby preventing the exhaust gas from being discharged through the second exhaust cavity 34. In this case, the APL valve assembly 100 is in the working state. It can be understood that after the switching element 133 closes the outlet of the loop cavity 32, according to the force balance, the pressure in the loop cavity 32 is equal to the pressure in the working cavity 01, thereby ensuring that the pressure in the anesthetic gas is within the set pressure range. The APL valve assembly 100 is in the working state, and the working cavity 01 is kept in communication with the second exhaust cavity 34. During the process of reducing the output pressure value of the secondary pressure reducing valve 12, the pressure in the working cavity 01 can be reduced in time. In this way, when the anesthesia machine is powered off, the APL valve assembly 100 can be automatically opened without manual operation, and the risk of excessively low loop pressure due to human negligence can also be avoided.

[0047] When the pressure inside the circuit cavity 32 exceeds the pressure inside the working cavity 01, the switching element 133 is pushed open, and the gas inside the circuit cavity 32 is discharged to the second exhaust gas discharge cavity 34 through the first exhaust gas discharge cavity 33. The switching element 133 automatically closes the circuit cavity 32 when the pressure inside the circuit cavity 32 equals the pressure inside the working cavity 01, and so on.

[0048] The aforementioned APL valve assembly 100 is used in an anesthesia machine. When the anesthesia machine is powered on, the solenoid valve 14 is energized and closed, cutting off the oxygen source 200 of the APL valve assembly 100. The residual gas in the working chamber 01 is discharged through the second exhaust chamber 34, and the pressure in the working chamber 01 drops to equal to or less than the pressure in the circuit chamber 32. Figure 5 As shown, the switching element 133 opens the loop cavity 32, connecting it to the first exhaust gas discharge cavity 33. This allows the exhaust gas within the loop cavity 32 to be discharged through the first exhaust gas discharge cavity 33 and the second exhaust gas discharge cavity 34. In this state, the APL valve assembly 100 is in a disabled (closed) state, and pressure control is taken over by the anesthesia machine's ventilator system. Thus, when the anesthesia machine is powered on, the APL valve assembly 100 can automatically close without manual operation.

[0049] As can be seen from the above, the APL valve assembly 100 provided in this embodiment can automatically close when the anesthesia machine is powered on and automatically open when the anesthesia machine is powered off, without the need for manual operation, effectively reducing the workload of medical staff.

[0050] The APL valve assembly 100 provided in this embodiment includes a solenoid valve 14, a primary pressure reducing valve 11, a secondary pressure reducing valve 12, and a switching assembly 13, thereby dividing the APL valve assembly 100 into four parts. Since the output pressure value of the secondary pressure reducing valve 12 needs to be manually adjusted, the secondary pressure reducing valve 12 is installed on the anesthesia machine housing. The solenoid valve 14, the primary pressure reducing valve 11, and the switching assembly 13 do not require manual operation, so that the solenoid valve 14, the primary pressure reducing valve 11, and the switching assembly 13 do not need to be installed on the anesthesia machine housing, thereby reducing the area occupied by the APL valve assembly 100 on the anesthesia machine housing, which is beneficial for the installation of the APL valve assembly 100. Moreover, it is beneficial for the miniaturization design and usability of the anesthesia machine. The solenoid valve 14, the primary pressure reducing valve 11, and the switching assembly 13 can be installed in other locations besides the anesthesia machine housing, improving the installation flexibility of the solenoid valve 14, the primary pressure reducing valve 11, and the switching assembly 13.

[0051] For example, the secondary pressure reducing valve 12 can be fixed to the anesthesia machine housing by a threaded connection, snap-fit ​​structure or other structure.

[0052] In the APL valve assembly 100 provided in this embodiment, the "normally open when power-off" characteristic of the solenoid valve 14 is utilized to bind the electrical state of the solenoid valve 14 to the power supply state of the anesthesia machine. When the anesthesia machine experiences a sudden power outage, the solenoid valve 14 instantly loses its magnetic constraint and automatically opens, without waiting for sensor signals or controller commands. Compared to manually rotating the APL valve knob to open it, this utilizes the rapid transmission characteristics of pneumatics to complete the airway connection instantly upon power failure, allowing the high-pressure gas from the oxygen source 200 to quickly enter the working chamber 01 and drive the switching element 133 to actuate. This ensures that the APL valve is already in standby mode the instant the ventilator stops working due to a power outage, effectively preventing the PEEP value (Positive End-Expiratory Pressure) from becoming too low and effectively protecting the patient's ventilation safety.

[0053] The APL valve assembly 100 provided in this embodiment utilizes a primary pressure reducing valve 11 and a secondary pressure reducing valve 12 to perform two-stage pressure reduction on high-pressure oxygen, which facilitates precise control of the gas pressure output by the secondary pressure reducing valve 12, thereby improving the stability of the pressure in the working chamber 01, improving the switching accuracy of the switching element 133, and thus improving the reliability of the APL valve assembly 100.

[0054] In the APL valve assembly 100 provided in this embodiment, the working chamber 01 is always connected to the second exhaust gas discharge chamber 34 regardless of whether the APL valve assembly 100 is in a working state or a failed state. This means that in the power failure state, the gas in the circuit cavity 32 and the gas in the working chamber 01 share the second exhaust gas discharge chamber 34 for discharge, which simplifies the gas path design of the APL valve assembly 100. Moreover, the gas (oxygen) discharged from the working chamber 01 is collected in the second exhaust gas discharge chamber 34 and then discharged, which reduces the probability of danger caused by gas overflow.

[0055] In some embodiments, the switching assembly 13 includes a housing 131, which can be fastened to the housing 31 of the anesthetic gas circuit device 300 by screws.

[0056] The inlet of the switching component 13 is located in the pressure shell 131. In order to facilitate the connection between the switching component 13 and the secondary pressure reducing valve 12, the inlet of the switching component 13 is provided with an inlet quick connector 132 for connecting the pipeline from the secondary pressure reducing valve 12.

[0057] The switching element 133 is pressed between the pressure shell 131 and the housing 31. A portion of the pressure shell 131 and the switching element 133 form a working chamber 01, and a portion of the pressure shell 131 and a portion of the switching element 133 are used to form an exhaust chamber 02 with the housing 31. The working chamber 01 is connected to the exhaust chamber 02 and the second exhaust gas exhaust chamber 34.

[0058] The above structure uses a clamping switching component 133 between the pressure shell 131 and the housing 31, which improves the structural compactness and also helps to reduce the number of parts; by using the housing 31 of the anesthetic gas circuit device 300 itself as part of the cavity, the number of parts is reduced and the component volume is reduced.

[0059] To facilitate the formation of the working chamber 01 and the discharge chamber 02, the pressure shell 131 includes an outer shell 1311 and a partition 1312 disposed within the outer shell 1311. The outer shell 1311 and the partition 1312 can be an integral structure or a separate structure. The inner cavity of the outer shell 1311 is divided into a first sub-cavity 134 and a second sub-cavity 135 by the partition 1312. The partition 1312 is provided with a through hole 13121, which connects the first sub-cavity 134 and the second sub-cavity 135. The switching member 133 is pressed between the end face of the pressure shell 131 and the housing 31. The partition 1312 and the switching member 133 are pressed together, and the switching member 133 and the first sub-cavity 134 form the working chamber 01. The second sub-cavity 135, a portion of the switching member 133, and the housing 31 form the discharge chamber 02. In this structure, the partition 1312 not only serves to separate the chambers but also supports the switching element 133, improving its stability. When the solenoid valve 14 closes to release pressure, the gas in the working chamber 01 can quickly enter the second sub-chamber 135 through the through hole 13121 and then be discharged into the second exhaust chamber 34. The exhaust path of the through hole 13121 greatly shortens the pressure release time, significantly reducing the response time of the APL valve from "working state" to "failure state," thus ensuring the timeliness of the ventilator takeover control.

[0060] To improve the performance of the APL valve assembly 100, the diameter of the through hole 13121 is less than 1 mm. In some other embodiments, the diameter of the through hole 13121 may also be 1 mm or other values, and this application embodiment does not limit this.

[0061] In some embodiments, the switching element 133 can be a second diaphragm, which serves as both a pressure sensing element and a switching actuation element. It has no mechanical friction, extremely fast response speed, and no risk of lubricant contamination, thus meeting the cleanliness requirements of anesthetic gases. Alternatively, the switching element 133 can be of other types, which are not limited in this disclosure.

[0062] In this embodiment of the disclosure, the first diaphragm 122 and the second diaphragm can both be silicone diaphragms or other types.

[0063] In some embodiments, the circumferential outer wall of the end where the valve body 121 connects to the valve cap 123 is provided with a pressure scale value, and the valve cap 123 is provided with a pressure indicator mark that cooperates with the pressure scale value. In this way, the scale mark makes pressure adjustment visible, and the output pressure value of the secondary pressure reducing valve 12 can be clearly obtained, which facilitates the operator to adjust the valve cap 123, thereby making it easier to adjust the output pressure value of the secondary pressure reducing valve 12 and avoiding the blind adjustment by the operator based on feeling.

[0064] For example, pressure scale values ​​are engraved on the outer peripheral wall near the valve cap 123, with a pressure scale range of 0-10 kPa. The knob can be rotated 300 degrees from 0-10 kPa. The pressure scale values ​​can include scale lines and pressure values, including 0, 1 kPa, 2 kPa, 3 kPa, 4 kPa, 5 kPa, 6 kPa, 7 kPa, 8 kPa, 9 kPa, and 10 kPa. The minimum pressure value represented by the scale line is 0.1 kPa. The edge of the valve cap 123 has a pointer-shaped pressure indicator. When the valve cap 123 is rotated, the pressure indicator points to different scales, thus visually displaying the current output pressure value.

[0065] In some embodiments, to simplify the operation of the operator, when the valve cap 123 is at the first preset angle, the output pressure of the secondary pressure reducing valve 12 is the lower limit of the output pressure setting range; when the valve cap 123 is at the second preset angle, the output pressure of the secondary pressure reducing valve 12 is the upper limit of the output pressure setting range; the angle difference between the second preset angle and the first preset angle is less than 360°, for example, the angle difference between the second preset angle and the first preset angle can be 300°.

[0066] The specific structure of the secondary pressure reducing valve 12 in the APL valve assembly 100 is designed according to actual requirements. For example... Figure 7 As shown, in some embodiments, the secondary pressure reducing valve 12 includes: a valve body 121, a valve cap 123, a connecting post 124, a valve core assembly 125, and an elastic element 126.

[0067] The valve body 121 is provided with an air inlet 1201, a first chamber 1203, a second chamber 1204, and an air outlet 1202, which are sequentially connected. Specifically, the air inlet 1201 is connected to the inlet of the first chamber 1203, the outlet of the first chamber 1203 is connected to the inlet of the second chamber 1204, and the outlet of the second chamber 1204 is connected to the air outlet 1202.

[0068] The valve cap 123 and the valve body 121 are fixed relative to each other in the axial direction, and the valve cap 123 is rotatably disposed on the valve body 121 about the axial direction. It can be understood that the axial direction is the axial direction of the secondary pressure reducing valve 12, the axial direction of the valve cap 123 is the axial direction of the secondary pressure reducing valve 12, and the axial direction of the valve body 121 is also the axial direction of the secondary pressure reducing valve 12.

[0069] For example, such as Figure 8 As shown, to facilitate the connection between the valve cap 123 and the valve body 121, the valve body 121 is provided with a first retaining groove 12111, and the valve cap 123 is provided with a retaining clip 1231. The retaining clip 1231 is located within the first retaining groove 12111, and the retaining clip 1231 and the first retaining groove 12111 abut against each other in the axial direction, thus restricting the axial movement of the valve cap 123. In the radial direction, there is a gap between the retaining clip 1231 and the first retaining groove 12111, which is a movable gap, allowing the valve cap 123 to rotate smoothly around the axial direction. In this structure, by pressing the retaining clip 1231 radially, the retaining clip 1231 can be placed within the first retaining groove 12111, facilitating the installation of the valve cap 123.

[0070] In another example, the positions of the latch 1231 and the first slot 12111 can be interchanged, that is, the first slot 12111 is set on the valve cap 123, and the latch 1231 is set on the valve body 121.

[0071] like Figure 7 As shown, the connecting post 124 and the valve body 121 are threaded together, and the connecting post 124 and the valve cap 123 are relatively fixed in the circumferential direction. The circumferential direction refers to the circumferential direction of the valve body 121. The fact that the connecting post 124 and the valve cap 123 are relatively fixed in the circumferential direction can be understood as the connecting post 124 rotating with the valve cap 123.

[0072] For example, in order to facilitate the connection of valve cap 123 and connecting post 124, a protrusion 1242 is provided on the circumferential side wall of connecting post 124, and a second slot is provided on the inner wall of valve cap 123. The protrusion 1242 is located in the second slot, and the protrusion 1242 and the second slot abut against each other in the circumferential direction, so that connecting post 124 and valve cap 123 are relatively fixed in the circumferential direction, and connecting post 124 and valve cap 123 will not rotate relative to each other.

[0073] In another example, the positions of the protrusion 1242 and the second slot can be interchanged, that is, the second slot is provided on the connecting post 124, and the protrusion 1242 is provided on the valve cap 123.

[0074] It should be noted that the connection structure between the connecting column 124 and the valve cap 123, and the connection structure between the valve cap 123 and the valve body 121, do not affect each other and can be combined according to actual conditions.

[0075] The connecting column 124 and the valve body 121 are threaded together. Specifically, the connecting column 124 has an external thread, and the valve body 121 has a threaded hole. The connecting column 124 is located inside the threaded hole, and the external thread of the connecting column 124 and the threaded hole of the valve body 121 are threaded together. In this way, the rotational motion of the valve cap 123 can be accurately converted into the linear motion of the connecting column 124, ensuring the stability of the two-stage pressure reducing valve 12.

[0076] The valve core assembly 125 is connected to the connecting post 124 via an elastic element 126, which is capable of axial extension and contraction. The elastic element 126 can be a spring or other types, and this embodiment does not limit the specific type.

[0077] To facilitate the connection between the connecting post 124 and the valve core assembly 125, the connecting post 124 is provided with a receiving groove 1241. One end of the elastic member 126 is located in the receiving groove 1241, and the end face of the elastic member 126 and the bottom of the receiving groove 1241 abut against each other in the axial direction. The other end of the elastic member 126 abuts against the valve core assembly 125 in the axial direction.

[0078] In the two-stage pressure reducing valve 12, a first diaphragm 122 is disposed within the valve body 121. The first diaphragm 122, the valve body 121, and the valve core assembly 125 form a third cavity 1205, which is connected to a second cavity 1204. It should be noted that the second cavity 1204 has two outlets; one outlet of the second cavity 1204 is connected to the air outlet 1202, and the other outlet of the second cavity 1204 is connected to the third cavity 1205.

[0079] For example, the valve body 121 is provided with a connecting hole 1206. In the radial direction, the connecting hole 1206 is located on one side of the valve core assembly 125; the connecting hole 1206 connects the third cavity 1205 and the second cavity 1204. The diameter of the connecting hole 1206 is designed according to the actual situation, and this embodiment does not limit it.

[0080] In the above structure, a small fitting gap is reserved between the valve core assembly 125 and the inner wall of the second cavity 1204 to ensure that the valve core assembly 125 can move axially.

[0081] The valve core assembly 125 and the first diaphragm 122 are fixedly connected. The valve core 1255 of the valve core assembly 125 is located in the first cavity 1203. A first sealing element 127 is provided at the connection between the first cavity 1203 and the second cavity 1204. The valve core 1255 can abut against the first sealing element 127 to separate the first cavity 1203 and the second cavity 1204. The valve core 1255 can also separate from the first sealing element 127 to allow the first cavity 1203 and the second cavity 1204 to connect.

[0082] It is understood that the valve core assembly 125 passes through the first diaphragm 122, the third cavity 1205, and the second cavity 1204, with the first cavity 1203, the second cavity 1204, and the third cavity 1205 distributed axially. The first seal 127 can be a star-shaped seal ring. In the above embodiment, high-pressure gas, for example, gas pressure of 30-50 kPa, enters the inlet 1201 of the secondary pressure reducing valve 12, enters the first chamber 1203 through the inlet 1201, and then enters the second chamber 1204 through the first chamber 1203. A portion of the gas in the second chamber 1204 is discharged through the outlet 1202, and a portion of the gas in the second chamber 1204 enters the third chamber 1205. When the pressure in the third chamber 1205 reaches the output pressure value, the pressure in the third chamber 1205 pushes the first diaphragm 122 to deform axially upward, causing the first diaphragm 122 to recover. During the deformation process, the first diaphragm 122 drives the valve core assembly 125 to move axially upward, causing the valve core 1255 of the valve core assembly 125 to abut against the first seal 127, thus achieving isolation between the first chamber 1203 and the second chamber 1204, that is, the secondary pressure reducing valve 12 is in the closed state. Figure 7 and Figure 9 The diagram shows the secondary pressure reducing valve 12 in the closed state. As the pressure at the outlet 1202 decreases or the output pressure of the secondary pressure reducing valve increases, the pressure of the elastic element 126 pushes the first diaphragm 122 to move axially downward, causing the valve core 1255 of the valve core assembly 125 to separate from the first seal 127, thus connecting the first chamber 1203 and the second chamber 1204, i.e., the secondary pressure reducing valve 12 is in the open state. Figure 10 and Figure 11 The secondary pressure reducing valve 12 is shown in the open position.

[0083] When the output pressure of the secondary pressure reducing valve 12 is 0, it is in the closed state. The high-pressure gas in the first chamber 1203 applies pressure F to the valve core 1255, causing it to close tightly and ensuring no gas output from the secondary pressure reducing valve 12. The cross-section of the valve core 1255 is perpendicular to the axial direction, and its cross-sectional area is small. Therefore, only a force greater than F needs to be applied to the valve core 1255 to open the secondary pressure reducing valve 12.

[0084] The deformation of the first diaphragm 122 is relatively small, resulting in a shorter opening stroke for the valve core assembly 125. This ensures a smaller opening gap for the valve core assembly 125, thereby minimizing output pressure fluctuations in the secondary pressure reducing valve 12. The volume of the third chamber 1205, the diameter of the inlet 1201, and the gap between the valve core assembly 125 and the inner wall of the second chamber 1204 can be precisely calculated to ensure a high response speed for the secondary pressure reducing valve 12, thus improving its accuracy. For example, the accuracy of the secondary pressure reducing valve 12 can be ±0.1%.

[0085] In the above embodiments, since the valve cap 123 and the valve body 121 are relatively fixed in the axial direction, the valve cap 123 does not move in the axial direction. Rotating the valve cap 123 around the axial direction causes the connecting column 124 and the valve cap 123 to rotate and move axially, as the connecting column 124 and the valve body 121 are relatively fixed in the circumferential direction and are threadedly engaged. The elastic element 126 deforms as the connecting column 124 moves axially. Therefore, by rotating the valve cap 123, the compression deformation of the elastic element 126 can be adjusted, that is, the preload of the elastic element 126 on the valve core assembly 125 can be adjusted, thereby adjusting the output pressure of the secondary pressure reducing valve 12. For example, rotating the valve cap 123 clockwise moves the connecting column 124 downwards, increasing the compression of the elastic element 126 and increasing the output pressure of the secondary pressure reducing valve 12; rotating the valve cap 123 counterclockwise moves the connecting column 124 upwards, decreasing the compression of the elastic element 126 and decreasing the output pressure of the secondary pressure reducing valve 12.

[0086] In the above embodiments, stepless pressure regulation can be achieved by rotating the valve cap 123; the connecting column 124 and the valve body 121 are threadedly engaged, and the threaded drive has a speed reduction and force increase function, which makes the operator feel clearly when rotating the valve cap 123, and can achieve fine adjustment within the range of 0-10kPa, avoiding "over-adjustment" or "under-adjustment" of the output pressure value; the threaded drive also has a self-locking function, and the thread self-locking characteristic ensures that the output pressure value is not easily changed under equipment vibration or airflow pulsation, thus improving the stability of the APL valve's output pressure value.

[0087] In the above embodiment, when the pressure at the outlet 1202 increases, the pressure in the third chamber 1205 increases synchronously, pushing the first diaphragm 122 to overcome the elastic force of the elastic element 126 and move upward, causing the valve core 1255 to approach or adhere to the first sealing element 127, reducing the flow rate of gas entering the second chamber 1204. In this way, the opening can be automatically adjusted according to the change of outlet load, reducing the output pressure fluctuation of the secondary pressure reducing valve 12, thereby reducing the probability of the APL valve assembly 100 being opened or refused to operate, and improving the reliability of the APL valve assembly 100.

[0088] In the above embodiment, the output pressure value of the secondary pressure reducing valve 12 precisely limits the maximum pressure of the circuit, constructing an airlock sealing structure to ensure the reliability of pressure limiting under power failure conditions.

[0089] like Figure 7 As shown, in some embodiments, a limiting member 128 is provided in the first cavity 1203. When the valve core 1255 and the first seal 127 are separated, the limiting member 128 can abut against the valve core assembly 125 in the axial direction. It can be understood that the limiting member 128 is located at the end of the first cavity 1203 that is axially away from the first seal 127.

[0090] To facilitate the limiting member 128 in limiting the valve core assembly 125, a limiting groove 1281 is formed on the side of the limiting member 128 facing the valve core 1255. The limiting groove 1281 is used to accommodate a portion of the valve core assembly 125. Alternatively, the limiting member 128 and the valve core assembly 125 can be axially limited by other structures, which is not limited in this embodiment.

[0091] In the above embodiments, during the downward axial movement of the valve core assembly 125, the limiting member 128 can prevent the valve core assembly 125 from continuing to move downward, limiting the maximum opening stroke of the valve core assembly 125. This prevents the valve core assembly 125 from generating excessive tensile force on the first diaphragm 122, protecting the first diaphragm 122 and reducing the probability of damage to the first diaphragm 122. Since the limiting member 128 limits the maximum opening stroke of the valve core assembly 125, it can reduce the output pressure fluctuation of the secondary pressure reducing valve 12 and improve the control accuracy of the secondary pressure reducing valve 12. At the same time, it also ensures that the secondary pressure reducing valve 12 has a constant maximum flow capacity, improving the reliability of the secondary pressure reducing valve 12.

[0092] In the APL valve assembly 100, the specific structure of the valve body 121 of the secondary pressure reducing valve 12 is designed according to the actual situation. For example... Figure 7 As shown, in some embodiments, to facilitate the processing of the valve body 121 and simplify the assembly of the secondary pressure reducing valve 12, the valve body 121 adopts a split design. Specifically, the valve body 121 includes a mounting base 1211, a first valve seat 1212, a second valve seat 1213, a mounting post 1214, and a third valve seat 1215. The mounting base 1211, the first valve seat 1212, the second valve seat 1213, and the third valve seat 1215 are arranged sequentially along the axial direction and fixedly connected.

[0093] The valve cap 123 and the mounting base 1211 are fixed relative to each other in the axial direction, and the valve cap 123 is rotatably mounted on the mounting base 1211 about the axial direction. The specific connection structure between the valve cap 123 and the mounting base 1211 can be referred to the connection structure between the valve cap 123 and the valve body 121 described above, and will not be repeated here.

[0094] Mounting base 1211 is fitted over connecting post 124, and connecting post 124 and mounting base 1211 are threaded together; portions of valve core assembly 125 and elastic element 126 are located within mounting base 1211. It is understood that mounting base 1211 is used to accommodate portions of connecting post 124, elastic element 126, and valve core assembly 125. The base plate 12112 of mounting base 1211 has clearance holes for valve core assembly 125 to pass through.

[0095] The first valve seat 1212 and the mounting base 1211 can be fixedly connected by threaded fasteners or snap-fit ​​structures.

[0096] A portion of the first diaphragm 122 is sandwiched between the first valve seat 1212 and the second valve seat 1213. It can be understood that the fixed connection between the first valve seat 1212 and the second valve seat 1213 achieves the clamping of the edge portion of the first diaphragm 122, and the first diaphragm 122 is sealed to both the first valve seat 1212 and the second valve seat 1213. The second valve seat 1213, the first diaphragm 122, the mounting post 1214, and the valve core assembly 125 form a sealed third cavity 1205.

[0097] Mounting post 1214 is disposed within second valve seat 1213. For example, second valve seat 1213 is provided with threaded hole, which is threadedly engaged with mounting post 1214. Mounting post 1214, valve core assembly 125 and second valve seat 1213 form second cavity 1204.

[0098] It should be noted that a first sealing element 127 and a second sealing element 129 are provided between the mounting post 1214 and the second valve seat 1213 to ensure a sealed connection between the mounting post 1214 and the second valve seat 1213. The first sealing element 127 and the second sealing element 129 can both be O-rings or other types, and this embodiment does not limit the specific type.

[0099] Part of the second valve seat 1213 is located inside the third valve seat 1215. The third valve seat 1215, the second valve seat 1213, the valve core 1255 and the first sealing element 127 form a first cavity 1203. The air inlet 1201 and the air outlet 1202 are both located in the third valve seat 1215.

[0100] It is understood that the third valve seat 1215 is sleeved on the second valve seat 1213, and the third valve seat 1215 and the second valve seat 1213 can be fixedly connected by a threaded connector; the third valve seat 1215 and the second valve seat 1213 are provided with a third sealing element 1210a and a fourth sealing element 1210b at the mating surface to make the third valve seat 1215 and the second valve seat 1213 sealed together, and the third sealing element 1210a and the fourth sealing element 1210b are distributed axially at intervals.

[0101] There is at least one third seal 1210a and at least one fourth seal 1210b. In the axial direction, the air outlet 1202 is located between the third seal 1210a and the fourth seal 1210b; the fourth seal 1210b is closer to the valve core 1255 than the third seal 1210a; the fourth seal 1210b has the function of separating the first cavity 1203 and the second cavity 1204; the third seal 1210a has the function of sealing the second cavity 1204 to prevent leakage between the second cavity 1204 and the external space.

[0102] The third seal 1210a and the fourth seal 1210b can both be O-rings or other types, and this disclosure does not limit this.

[0103] The aforementioned connecting hole 1206 and limiting member 128 can both be provided in the second valve seat 1213. The third valve seat 1215 can be fixed to the anesthesia machine housing by a threaded connector, snap-fit ​​structure or other structure. For example, the third valve seat 1215 is provided with a mounting hole 12151, and the third valve seat 1215 is fixed to the anesthesia machine housing by a threaded fastener that mates with the mounting hole 12151.

[0104] To ensure the reliability of the secondary pressure reducing valve 12, all seals involved in the secondary pressure reducing valve 12 can be made of elastic materials resistant to high-pressure oxygen, such as fluororubber or other materials. This disclosure does not limit this.

[0105] The split structure of the valve body 121 reduces the processing difficulty of the complex cavity inside the valve body 121 and reduces the scrap rate of the valve body 121. At the same time, it facilitates the assembly, inspection and replacement of components such as the first diaphragm 122 and the valve core assembly 125, which is beneficial to the later maintenance of the secondary pressure reducing valve 12.

[0106] In some other embodiments, the first valve seat 1212 and the mounting base 1211 may be an integral structure, or the valve body 121 may be other structures, and is not limited to the above embodiments.

[0107] In the APL valve assembly 100, the specific structure of the valve core assembly 125 of the secondary pressure reducing valve 12 is designed according to the actual situation. For example... Figure 7 As shown, in some embodiments, the valve core assembly 125 adopts a split assembly structure. Specifically, the valve core assembly 125 includes a first pressing member 1251, a second pressing member 1252, a third pressing member 1253, a valve stem 1254, and a valve core 1255.

[0108] The first pressing member 1251 and the elastic member 126 abut against each other in the axial direction. For example, a portion of the first pressing member 1251 may be fitted onto the elastic member 126.

[0109] The first pressing member 1251 may be provided with a weight-reducing hole, which can also be used to fix the elastic member 126 and the first pressing member 1251. The first pressing member 1251 may be in the form of a block or other shapes, and this embodiment does not limit the shape.

[0110] The second pressing member 1252 and the first pressing member 1251 can be fixedly connected by threaded engagement, or the second pressing member 1252 and the first pressing member 1251 can be fixedly connected by other structures, which is not limited in this embodiment. The second pressing member 1252 can be block-shaped or other shapes, which is not limited in this embodiment.

[0111] The third pressing member 1253 and the second pressing member 1252 abut against each other. Alternatively, the third pressing member 1253 and the second pressing member 1252 can also be fixedly connected.

[0112] The third pressure member 1253 is located at one end of the valve stem 1254. The third pressure member 1253 and the valve stem 1254 can be fixedly connected by threaded engagement. For example, the third pressure member 1253 can be a nut structure, which is sleeved on the threaded section of the valve stem 1254. Alternatively, the third pressure member 1253 and the valve stem 1254 can also be fixedly connected by a snap-fit ​​structure or other structures.

[0113] In the axial direction, the third pressure member 1253 is located on the side of the first diaphragm 122 away from the third cavity 1205, and the first diaphragm 122 is sandwiched between the valve stem 1254 and the third pressure member 1253. The valve stem 1254 extends axially and passes through the first diaphragm 122, the third cavity 1205 and the second cavity 1204. The valve stem 1254 extends downward into the first cavity 1203, and the valve core 1255 is fixed to the valve stem 1254. The valve stem 1254 is locked by the third pressure member 1253, so that a rigid connection and seal are formed between the valve stem 1254 and the first diaphragm 122.

[0114] It should be noted that, to ensure the sealing performance of the third cavity 1205, both the third pressure member 1253 and the valve stem 1254 are sealed to the first diaphragm 122. The valve stem 1254 passes through the first diaphragm 122, the second valve seat 1213, and the mounting post 1214. There is a small gap between the valve stem 1254 and the mounting post 1214 to ensure that the valve stem 1254 can reciprocate axially relative to the mounting post 1214. The valve stem 1254 has a first rod segment, a second rod segment, and a third rod segment, which are sequentially distributed and connected axially. The diameters of the first and third rod segments are both smaller than the diameter of the second rod segment. The first rod segment passes through the first diaphragm 122, which is sandwiched between the end face of the second rod segment near the first rod segment and the third pressure member 1253. The valve core 1255 is disposed on the third rod segment.

[0115] As described above, the valve body 121 includes a mounting base 1211, a first valve seat 1212, a second valve seat 1213, a mounting post 1214, and a third valve seat 1215. The first pressing member 1251 and the elastic member 126 are both located inside the mounting base 1211. The first pressing member 1251 passes through the bottom plate 12112 of the mounting base 1211, and the second pressing member 1252 passes through the bottom plate 12112 of the mounting base 1211. The second pressing member 1252 is sleeved on a portion of the first pressing member 1251 so that the second pressing member 1252 and the first pressing member 1251 are threadedly engaged. A portion of the second pressing member 1252, a portion of the first diaphragm 122, and the third pressing member 1253 are all located inside the first valve seat 1212. The second valve seat 1213, the first diaphragm 122, the mounting post 1214, the third pressing member 1253, and the valve stem 1254 form a sealed third cavity 1205. In this structure, the mounting post 1214 plays a good guiding role for the valve stem 1254, preventing the valve core 1255 from deflecting during movement, and ensuring the coaxiality of the valve core 1255 and the first sealing element 127, thereby improving the sealing performance and the adjustment accuracy of the secondary pressure reducing valve 12.

[0116] In the above embodiments, the split structure of the valve core assembly 125 makes the clamping of the first diaphragm 122 more secure and reliable; each component of the valve core assembly 125 can be processed separately, and the precision is easier to guarantee; when the valve core 1255 is worn, only the valve core 1255 or the valve stem 1254 with the valve core 1255 needs to be replaced, without scrapping the entire assembly, thus reducing the maintenance cost of the secondary pressure reducing valve 12.

[0117] In the above embodiments, the valve core 1255 and the valve stem 1254 can be an integral structure, which can improve the reliability of the valve core 1255 in separating the first cavity 1203 and the second cavity 1204. When the valve core 1255 is worn, only the valve stem 1254 with the valve core 1255 needs to be replaced, without scrapping the entire component, which can reduce the maintenance cost of the secondary pressure reducing valve 12.

[0118] In some other embodiments, the valve core 1255 and the valve stem 1254 can also be a separate structure. When the valve core 1255 is worn, only the valve core 1255 needs to be replaced, without scrapping the entire component, thus reducing the maintenance cost of the secondary pressure reducing valve 12.

[0119] To facilitate the connection between the secondary pressure reducing valve 12 and the primary pressure reducing valve 11, and between the secondary pressure reducing valve 12 and the switching assembly 13, an inlet quick-connect fitting 1216 is provided at the air inlet 1201, and an outlet quick-connect fitting 1217 is provided at the air outlet 1202. In this way, the inlet quick-connect fitting 1216 and the outlet quick-connect fitting 1217 can effectively improve the assembly efficiency of the pipeline and facilitate the production and maintenance of the equipment.

[0120] The specific types of the quick-connect fitting 1216 for air intake and quick-connect fitting 1217 for air exhaust can be selected according to the actual situation, and this disclosure does not limit them.

[0121] Based on the APL valve assembly 100 provided in the above embodiments, this disclosure also provides an anesthesia machine, which includes the APL valve assembly 100 described in the above embodiments.

[0122] The anesthesia machine integrates the aforementioned APL valve assembly 100. The overall control system of the anesthesia machine is electrically connected to the solenoid valve 14 to achieve power synchronization, that is, the solenoid valve 14 is energized and closed when the anesthesia machine is turned on, and the solenoid valve 14 is de-energized and opened when the anesthesia machine is turned off or the power is cut off.

[0123] The anesthesia machine features a fully automatic switching capability with the APL valve assembly 100. In practical applications, whether it's a planned shutdown or a sudden power outage, the APL valve assembly 100 can automatically enter working mode without the need for emergency intervention by medical personnel, greatly improving the safety of the anesthesia process.

[0124] Based on the APL valve assembly 100 provided in the above embodiments, this disclosure also provides a pressure reducing valve 12a, which can be applied to medical pneumatic control applications where high-pressure gas is precisely reduced to low pressure (e.g., 0-10 kPa). For example, the pressure reducing valve 12a is applied to the APL valve assembly 100.

[0125] Pressure reducing valve 12a can be the two-stage pressure reducing valve 12 mentioned earlier. The specific structure of pressure reducing valve 12a is described in the previous text and will not be repeated here.

[0126] The above description is merely a preferred embodiment of this disclosure and an explanation of the technical principles used, and is not intended to limit this disclosure. The described embodiments are only a part of the embodiments of this disclosure, and not all of them. Various modifications and variations can be made to this disclosure by those skilled in the art. The scope of protection in this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalent features without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions provided in this disclosure.

Claims

1. An APL valve assembly, characterized in that, include: Solenoid valve (14), primary pressure reducing valve (11), secondary pressure reducing valve (12) and switching assembly (13); The outlet of the solenoid valve (14), the first-stage pressure reducing valve (11), the second-stage pressure reducing valve (12) and the inlet of the switching assembly (13) are connected in sequence. The inlet of the solenoid valve (14) is used to connect with the oxygen source (200) of the anesthesia machine. The solenoid valve (14) is in a closed state when energized and in an open state when de-energized. The switching assembly (13) is used to be fixedly connected to the anesthetic gas circuit device (300). The switching assembly (13) is provided with a working chamber (01), an exhaust chamber (02) and a switching element (133). The inlet of the switching assembly (13), the working chamber (01) and the exhaust chamber (02) are connected in sequence. The anesthetic gas circuit device (300) is provided with a circuit cavity (32), a first waste gas discharge cavity (33) and a second waste gas discharge cavity (34) connected to the first waste gas discharge cavity (33), and the working cavity (01) is used to communicate with the second waste gas discharge cavity (34); The switching element (133) is configured to: close the circuit cavity (32) when the pressure in the working chamber (01) is greater than the pressure in the circuit cavity (32); and open the circuit cavity (32) when the pressure in the working chamber (01) is not greater than the pressure in the circuit cavity (32), so that the circuit cavity (32) and the first exhaust gas discharge chamber (33) are connected.

2. The APL valve assembly according to claim 1, characterized in that, The secondary pressure reducing valve (12) includes: The valve body (121) is provided with an air inlet (1201), a first cavity (1203), a second cavity (1204) and an air outlet (1202) connected in sequence. Valve cap (123) and valve body (121) are fixed relative to each other in the axial direction, and valve cap (123) is rotatably disposed on valve body (121) about the axial direction. A connecting post (124) is threadedly fitted to the valve body (121), and the connecting post (124) and the valve cap (123) are relatively fixed in the circumferential direction; A valve core assembly (125) is connected to the connecting post (124) via an elastic element (126), the elastic element (126) being capable of extending and retracting along the axial direction; The valve body (121) is provided with a first diaphragm (122), and the first diaphragm (122), the valve body (121) and the valve core assembly (125) form a third cavity (1205); the third cavity (1205) and the second cavity (1204) are connected. The valve core assembly (125) and the first diaphragm (122) are fixedly connected. The valve core (1255) of the valve core assembly (125) is located in the first cavity (1203). A first sealing element (127) is provided at the communication point between the first cavity (1203) and the second cavity (1204). The valve core (1255) can abut against the first sealing element (127) to separate the first cavity (1203) and the second cavity (1204), and the valve core (1255) can separate from the first sealing element (127) to make the first cavity (1203) and the second cavity (1204) communicate.

3. The APL valve assembly according to claim 2, characterized in that, The valve body (121) is provided with a connecting hole (1206), which connects the third cavity (1205) and the second cavity (1204); in the radial direction, the connecting hole (1206) is located on one side of the valve core assembly (125).

4. The APL valve assembly according to claim 2, characterized in that, A limiting member (128) is provided inside the first cavity (1203); when the valve core (1255) and the first seal (127) are separated, the limiting member (128) can abut against the valve core assembly (125) in the axial direction.

5. The APL valve assembly according to claim 2, characterized in that, One of the valve body (121) and the valve cap (123) is provided with a first slot (12111), and the other is provided with a buckle (1231). The buckle (1231) is located in the first slot (12111), and the buckle (1231) and the first slot (12111) abut against each other in the axial direction. In the radial direction, there is a gap between the buckle (1231) and the first slot (12111). And / or, one of the connecting post (124) and the valve cap (123) is provided with a second slot and the other is provided with a protrusion (1242), the protrusion (1242) is located in the second slot, and the protrusion (1242) and the second slot abut against each other in the circumferential direction.

6. The APL valve assembly according to claim 2, characterized in that, The valve body (121) includes a mounting base (1211), a first valve seat (1212), a second valve seat (1213), a mounting post (1214), and a third valve seat (1215). The mounting base (1211), the first valve seat (1212), the second valve seat (1213), and the third valve seat (1215) are sequentially distributed and fixedly connected along the axial direction; The valve cap (123) and the mounting base (1211) are fixed relative to each other in the axial direction, and the valve cap (123) is rotatably disposed on the mounting base (1211) about the axial direction; the mounting base (1211) is sleeved on the connecting post (124), and the connecting post (124) and the mounting base (1211) are threaded together; a portion of the valve core assembly (125) and the elastic element (126) are both located inside the mounting base (1211); A portion of the first diaphragm (122) is sandwiched between the first valve seat (1212) and the second valve seat (1213); the second valve seat (1213), the first diaphragm (122), the mounting post (1214), and the valve core assembly (125) form a sealed third cavity (1205). The mounting post (1214) is disposed in the second valve seat (1213), and the mounting post (1214), the valve core assembly (125), and the second valve seat (1213) together form the second cavity (1204). A portion of the second valve seat (1213) is located within the third valve seat (1215), and the third valve seat (1215), the second valve seat (1213), the valve core (1255), and the first sealing element (127) together form the first cavity (1203); the air inlet (1201) and the air outlet (1202) are both located on the third valve seat (1215).

7. The APL valve assembly according to any one of claims 2-6, characterized in that, The valve core assembly (125) includes a first pressure member (1251), a second pressure member (1252), a third pressure member (1253), a valve stem (1254), and the valve core (1255). Wherein, one end of the first pressure member (1251) and the elastic member (126) abut in the axial direction, the second pressure member (1252) and the first pressure member (1251) are fixedly connected, the third pressure member (1253) and the second pressure member (1252) abut in the axial direction, the third pressure member (1253) and the valve stem (1254) are fixedly connected, and the valve core (1255) and the valve stem (1254) are fixedly connected; In the axial direction, the third pressure member (1253) is located on the side of the first diaphragm (122) away from the third cavity (1205); the valve stem (1254) extends along the axial direction and passes through the first diaphragm (122), the third cavity (1205) and the second cavity (1204), with a portion of the valve stem (1254) located within the first cavity (1203); both the third pressure member (1253) and the valve stem (1254) are sealed to the first diaphragm (122).

8. The APL valve assembly according to claim 7, characterized in that, The valve core (1255) and the valve stem (1254) are either an integral structure or a separate structure.

9. The APL valve assembly according to any one of claims 2-6, characterized in that, The valve body (121) is provided with a pressure scale value on the circumferential outer wall of the end where it is connected to the valve cap (123), and the valve cap (123) is provided with a pressure indicator mark that is used in conjunction with the pressure scale value. And / or, the first seal (127) is a star-shaped seal ring; And / or, an air inlet quick connector (1216) is provided at the air inlet (1201), and an air outlet quick connector (1217) is provided at the air outlet (1202). And / or, the output pressure range of the secondary pressure reducing valve (12) is 0-10 kPa.

10. The APL valve assembly according to any one of claims 1-6, characterized in that, The switching assembly (13) includes a pressure shell (131), the inlet of the switching assembly (13) is disposed in the pressure shell (131), the pressure shell (131) is fixedly connected to the housing (31) of the anesthetic gas circuit device (300), and the switching element (133) is pressed between the pressure shell (131) and the housing (31). A portion of the pressure shell (131) and the switching element (133) form the working chamber (01), and a portion of the pressure shell (131) and a portion of the switching element (133) are used to form the discharge chamber (02) with the housing (31). The working chamber (01) is connected to the second waste gas discharge chamber (34) through the discharge chamber (02). And / or, the switching element (133) is a second diaphragm; And / or, the secondary pressure reducing valve (12) is used to be installed on the anesthesia machine housing of the anesthesia machine; And / or, the inlet of the switching component (13) is provided with an inlet quick connector (132).

11. The APL valve assembly according to claim 10, characterized in that, The pressure shell (131) includes an outer shell (1311) and a partition (1312) disposed inside the outer shell (1311). The inner cavity of the outer shell (1311) is divided into a first sub-cavity (134) and a second sub-cavity (135) by the partition (1312). The partition (1312) is provided with a through hole (13121) which connects the first sub-cavity (134) and the second sub-cavity (135). The switching member and the first sub-cavity (134) form the working cavity (01). The second sub-cavity (135), a portion of the switching member (133), and the shell (31) form the discharge cavity (02). The partition (1312) and the switching member (133) are pressed together.

12. An anesthesia machine, characterized in that, include: The APL valve assembly (100) as described in any one of claims 1-11.

13. A pressure reducing valve, characterized in that, For APL valve assembly (100), the pressure reducing valve (12a) includes: The valve body (121) is provided with an air inlet (1201), a first cavity (1203), a second cavity (1204) and an air outlet (1202) connected in sequence. Valve cap (123) and valve body (121) are fixed relative to each other in the axial direction, and valve cap (123) is rotatably disposed on valve body (121) about the axial direction. A connecting post (124) is threadedly fitted to the valve body (121), and the connecting post (124) and the valve cap (123) are relatively fixed in the circumferential direction; A valve core assembly (125) is connected to the connecting post (124) via an elastic element (126), the elastic element (126) being capable of extending and retracting along the axial direction; The valve body (121) is provided with a first diaphragm (122), the first diaphragm (122), the valve body (121) and the valve core assembly (125) form a third cavity (1205), and the third cavity (1205) is connected to the second cavity (1204); The valve core assembly (125) and the first diaphragm (122) are fixedly connected. The valve core (1255) of the valve core assembly (125) is located in the first cavity (1203). A first sealing element (127) is provided at the communication point between the first cavity (1203) and the second cavity (1204). The valve core (1255) can abut against the first sealing element (127) to separate the first cavity (1203) and the second cavity (1204), and the valve core (1255) can separate from the first sealing element (127) to make the first cavity (1203) and the second cavity (1204) communicate.

14. The pressure reducing valve according to claim 13, characterized in that, The valve body (121) includes a mounting base (1211), a first valve seat (1212), a second valve seat (1213), a mounting post (1214), and a third valve seat (1215). The mounting base (1211), the first valve seat (1212), the second valve seat (1213), and the third valve seat (1215) are sequentially distributed and fixedly connected along the axial direction; The valve cap (123) and the mounting base (1211) are fixed relative to each other in the axial direction, and the valve cap (123) is rotatably disposed on the mounting base (1211) about the axial direction; the mounting base (1211) is sleeved on the connecting post (124), and the connecting post (124) and the mounting base (1211) are threaded together; a portion of the valve core assembly (125) and the elastic element (126) are both located inside the mounting base (1211); A portion of the first diaphragm (122) is sandwiched between the first valve seat (1212) and the second valve seat (1213); the second valve seat (1213), the first diaphragm (122), the mounting post (1214), and the valve core assembly (125) form a sealed third cavity (1205). The mounting post (1214) is disposed in the second valve seat (1213), and the mounting post (1214), the valve core assembly (125), and the second valve seat (1213) together form the second cavity (1204). A portion of the second valve seat (1213) is located within the third valve seat (1215), and the third valve seat (1215), the second valve seat (1213), the valve core (1255), and the first sealing element (127) together form the first cavity (1203); the air inlet (1201) and the air outlet (1202) are both located on the third valve seat (1215).

15. The pressure reducing valve according to claim 13 or 14, characterized in that, The valve core assembly (125) includes a first pressure member (1251), a second pressure member (1252), a third pressure member (1253), a valve stem (1254), and the valve core (1255). Wherein, one end of the first pressure member (1251) and the elastic member (126) abut in the axial direction, the second pressure member (1252) and the first pressure member (1251) are fixedly connected, the third pressure member (1253) and the second pressure member (1252) abut in the axial direction, the third pressure member (1253) and the valve stem (1254) are fixedly connected, and the valve core (1255) and the valve stem (1254) are fixedly connected; In the axial direction, the third pressure member (1253) is located on the side of the first diaphragm (122) away from the third cavity (1205); the valve stem (1254) extends along the axial direction and passes through the first diaphragm (122), the third cavity (1205) and the second cavity (1204), with a portion of the valve stem (1254) located within the first cavity (1203); both the third pressure member (1253) and the valve stem (1254) are sealed to the first diaphragm (122).

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