Pressure relief valve and anesthesia machine

Abstract

This application discloses a pressure relief valve and an anesthesia machine. The pressure relief valve includes a valve body assembly and a valve core assembly. The valve core assembly includes a first valve core, a second valve core, and a first elastic element. The first elastic element, the first valve core, and the second valve core all extend along a first direction. The first valve core is drivenly connected to the valve body assembly, and the second valve core is movably connected to the first valve core along the first direction. The first elastic element is connected between the first valve core and the second valve core. The end of the second valve core away from the first valve core is adapted to abut against the pressure-relieved component of the main body of the anesthesia machine. Operating the valve body assembly can drive the first valve core to reciprocate along the first direction to adjust the compression of the first elastic element, thereby adjusting the pressure of the second valve core on the pressure-relieved component. By designing the valve core assembly as a combination of the first valve core, the second valve core, and the first elastic element, this application simplifies the overall structure, greatly facilitates the disassembly and assembly of the pressure relief valve, and reduces maintenance difficulty and cost.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and in particular relates to a pressure relief valve and an anesthesia machine. Background Technology

[0002] During surgical anesthesia, the anesthesia machine needs to provide a stable anesthetic gas delivery environment for the patient by precisely controlling the airway pressure. As the core component of the anesthesia machine's airway pressure control, the pressure relief valve needs to adjust the pressure relief state in real time according to changes in airway pressure to ensure the patient's respiratory safety and the stability of anesthetic gas delivery.

[0003] In the existing technology, the structure of the pressure relief valve is relatively complicated, which makes it inconvenient to disassemble or maintain the pressure relief valve. Summary of the Invention

[0004] The technical problem to be solved by this application is: to provide a pressure relief valve and an anesthesia machine, addressing the issue that the existing intraoperative pressure relief valve has a cumbersome structure, making it inconvenient to disassemble or maintain.

[0005] To address the aforementioned issues, this application provides a pressure relief valve, comprising a valve body assembly and a valve core assembly. The valve core assembly includes a first valve core, a second valve core, and a first elastic element, wherein the first elastic element, the first valve core, and the second valve core all extend along a first direction. The first valve core is drivenly connected to the valve body assembly, the second valve core is movably connected to the first valve core along the first direction, the first elastic element is connected between the first valve core and the second valve core, and the end of the second valve core away from the first valve core is adapted to abut against the pressure relief component on the main body of the anesthesia machine; Operating the valve body assembly can drive the first valve core to reciprocate along the first direction to adjust the compression of the first elastic element, thereby adjusting the pressure of the second valve core on the pressure-relieving element.

[0006] Optionally, the first valve core is provided with a first mounting hole, the second valve core is provided with a second mounting hole, the first mounting hole and the second mounting hole are connected and both extend along the first direction, the second valve core is slidably connected to the first valve core, and the first elastic element is assembled in the first mounting hole and the second mounting hole.

[0007] Optionally, the valve body assembly includes a handle and a retaining sleeve, the retaining sleeve being sleeved outside the first valve core, and the handle being sleeved outside the retaining sleeve; The handle is provided with a first transmission structure, and the handle can drive the first valve core to rotate around a first axis through the first transmission structure. The fixed sleeve is provided with a second transmission structure. When the first valve core rotates around the first axis, the fixed sleeve can drive the first valve core to reciprocate along the first direction through the second transmission structure; wherein, the extension direction of the first axis coincides with the first direction.

[0008] Optionally, the first transmission structure includes a transmission groove, the transmission groove being open on one side along the first direction, the first valve core including a first connecting section and a second connecting section connected together, the first connecting section and the second connecting section being arranged sequentially along the first direction, and the second connecting section being provided with the first assembly hole; The first connecting segment is movably connected to the transmission groove along the first direction, and the circumferential displacement of the first valve core is limited by the handle; When the first valve core rotates around the first axis, the second transmission structure can drive the first valve core to reciprocate along the first direction through the second connecting section.

[0009] Optionally, the second transmission structure includes a protruding post disposed on the inner wall of the fixed sleeve, and the outer peripheral surface of the second connecting section is provided with a spiral opening groove; or, the second transmission structure includes a spiral opening groove disposed on the inner wall of the fixed sleeve, and the outer peripheral surface of the second connecting section is provided with a protruding post. The opening of the slot faces the protrusion, and the protrusion is driven to the slot.

[0010] Optionally, the valve core assembly further includes a buffer seat and a second elastic element, the buffer seat being adapted to abut against the pressure relief element, and the buffer seat being movably connected to the end of the second valve core away from the first valve core along the first direction; The second elastic element extends along the first direction and is connected between the buffer seat and the fixed sleeve.

[0011] Optionally, the handle is movably connected to the fixed sleeve along the first direction, and the valve core assembly further includes a push rod that extends along the first direction, passes through the first valve core, has one end fixedly connected to the second valve core, and has the other end fixedly connected to the handle.

[0012] Optionally, a limiting block is provided on the outer peripheral surface of the fixing sleeve, and the fixing sleeve, the limiting block and the handle form an accommodating space; The accommodating space is provided with a third elastic element, which extends along the first direction and connects between the handle and the limiting block.

[0013] Optionally, the pressure relief valve further includes a nut and a fixed seat. The fixed seat is sleeved on the outside of the fixed sleeve and fixedly connected thereto. The handle and the fixed seat are arranged sequentially along the first direction. The handle is movably connected to the fixed seat along the first direction. The nut is threadedly connected to the end of the fixed seat away from the handle.

[0014] According to the pressure relief valve provided in the embodiments of this application, when it is necessary to adjust the airway pressure of the anesthesia machine, the first valve core, which is connected to it, is driven to reciprocate along the first direction by operating the valve body assembly. Since the first elastic element is connected between the first valve core and the second valve core, the movement of the first valve core will directly change the compression of the first elastic element, and the change in the compression of the elastic element will correspondingly change its force on the second valve core. Since the second valve core is movably connected to the first valve core along the first direction, and its end away from the first valve core abuts against the pressure relief component of the anesthesia machine body, the second valve core will adjust the pressure on the pressure relief component under the action of elastic force, and finally realize the function of adjusting the pressure relief state in real time according to the change of airway pressure, ensuring a stable anesthetic gas delivery environment and protecting the patient's respiratory safety. This application simplifies the overall structure by designing the valve core assembly as a combination of a first valve core, a second valve core, and a first elastic element. This greatly facilitates the disassembly and assembly of the pressure relief valve, reducing maintenance difficulty and cost. At the same time, by using the valve body assembly to drive the first valve core to move and adjust the compression of the first elastic element, thereby controlling the pressure of the second valve core on the pressure relief element, precise and real-time adjustment of airway pressure can be achieved. This effectively ensures patient respiratory safety and the stability of anesthetic gas delivery, improving the reliability of the anesthesia machine.

[0015] An anesthesia machine provided in this application includes a main body, a pressure relief component, and the aforementioned pressure relief valve. The pressure relief component is disposed on the main body, and the end of the second valve core away from the first valve core abuts against the pressure relief component. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a pressure relief valve provided in one embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the internal structure cut along line AA; Figure 3 for Figure 1 Exploded view; Figure 4 This is a schematic diagram of the handle of the pressure relief valve provided in one embodiment of this application; Figure 5 This is a schematic diagram of the structure of the first valve core of the pressure relief valve provided in one embodiment of this application; Figure 6 This is a schematic diagram showing the connection relationship between the pressure relief valve and the main body in one embodiment of this application; Figure 7 for Figure 6 A schematic diagram of the internal structure cut along line BB; Figure 8 for Figure 7 A magnified view of C.

[0018] The reference numerals in the accompanying drawings are as follows: 10. Pressure relief valve; 20. Main body; 201. Component to be pressure relieved; 1. Valve body assembly; 11. Handle; 111. First transmission structure; 112. Protrusion; 1111. Transmission groove; 12. Fixing sleeve; 121. Second transmission structure; 1211. Protrusion; 122. Limiting block; 2. Valve core assembly; 21. First valve core; 211. First mounting hole; 212. First connecting section; 2121. Hollow structure; 2122. Perforation; 213. Second connecting section; 2131. Opening groove; 22. Second valve core; 221. Second mounting hole; 23. First elastic element; 24. Buffer seat; 25. Second elastic element; 26. Push rod; 3. Accommodation space; 4. Third elastic element; 5. Nuts; 6. Fixture. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] In the description of this application, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] like Figures 1 to 8 As shown, one embodiment of this application provides a pressure relief valve 10, including a valve body assembly 1 and a valve core assembly 2. The valve core assembly 2 includes a first valve core 21, a second valve core 22 and a first elastic member 23. The first elastic member 23, the first valve core 21 and the second valve core 22 all extend along a first direction. The first valve core 21 is drivenly connected to the valve body assembly 1, the second valve core 22 is movably connected to the first valve core 21 along the first direction, the first elastic member 23 is connected between the first valve core 21 and the second valve core 22, and the end of the second valve core 22 away from the first valve core 21 is adapted to abut against the pressure relief member 201 on the main body 20 of the anesthesia machine. Operating the valve body assembly 1 can drive the first valve core 21 to reciprocate along a first direction to adjust the compression of the first elastic element 23, thereby adjusting the pressure of the second valve core 22 on the pressure relief element 201. The "first direction" is the reference layout and movement direction of the core components inside the pressure relief valve 10, which can be understood as the "main axis direction of pressure adjustment" running through the entire pressure relief valve 10. From a structural layout perspective, the first elastic element 23 (such as a spring), the first valve core 21, and the second valve core 22 all extend along this direction, meaning that their central axes coincide with the "first direction," forming a coaxial assembly structure. This layout avoids force loss or jamming problems caused by misalignment between components, making force transmission more direct and stable. From a motion logic perspective, the "first direction" is also the reciprocating direction of the first valve core 21 and the movable direction of the second valve core 22: when operating the valve body assembly 1, the first valve core 21 moves closer to or further away from the second valve core 22 along this direction, thereby compressing or releasing the first elastic element 23; simultaneously, the second valve core 22 can only move along this direction to abut or disengage from the pressure-relieved component 201, completing the adjustment of the pressure on the pressure-relieved component 201. The first direction can be an auxiliary direction. Figure 1In the X direction. In the prior art, the second valve core 22 of some pressure relief valves 10 and the pressure relief component 201 adopt a "direct fixed connection" design (such as locking with bolts, welding or integral molding). This structure has obvious defects: on the one hand, the fixed connection requires additional design of complex connection structures (such as matching threaded holes, welding points or snap-fit ​​components), which increases the number of parts of the pressure relief valve 10 and makes the assembly steps cumbersome. This not only increases the production and manufacturing cost, but also makes the pressure relief valve 10 larger and difficult to fit into the compact installation space inside the anesthesia machine; on the other hand, when it is necessary to disassemble or maintain the pressure relief valve 10, since the second valve core 22 is fixed to the pressure relief component 201, the operator must first disassemble the relevant structure of the pressure relief component 201 of the anesthesia machine body 20 (such as disassembling the breathing airway, removing the valve plate fixing frame, etc.) before the pressure relief valve 10 can be removed as a whole. The maintenance process is time-consuming and laborious, and may also damage the components of the anesthesia machine body 20 due to frequent disassembly, affecting the overall stability of the equipment. This application adopts a "separate contact design between the second valve core 22 and the pressure relief component 201," where the two interact solely through "contact pressure," requiring no fixed connection structure. The end of the second valve core 22 furthest from the first valve core 21 only needs to be aligned with the pressure relief component 201 and maintain a moderate contact force to achieve pressure control. This simplifies the connection between the pressure relief valve 10 and the anesthesia machine body 20, eliminating the need for additional fixing components, reducing the number of parts, and making the overall structure of the pressure relief valve 10 more compact and concise. It significantly reduces the difficulty of disassembly and maintenance—when the pressure relief valve 10 needs to be replaced or repaired, it can simply be removed directly from the anesthesia machine body 20 without disassembling the pressure relief component 201 and surrounding structures, greatly shortening maintenance time and reducing the risk of damage to the components of the anesthesia machine body 20. The pressure relief component 201 is prior art and will not be described in detail in this application. For example, the pressure relief component 201 can be a "valve" in the breathing circuit of an anesthesia machine (usually made of elastic material, such as a silicone valve, which has a certain compressive strength and reset capability). The second valve core 22 can abut against the middle of the valve. The valve acts as a "pressure threshold switch" in the respiratory circuit: Under normal operating conditions, the valve is closed, ensuring the airtightness of the respiratory circuit of the main body 20 of the anesthesia machine, allowing anesthetic gas to be stably delivered to the patient's airway; when the pressure in the respiratory circuit exceeds the safety threshold due to abnormal conditions (such as a sudden increase in the patient's airway resistance, or an overload of the anesthesia machine's gas delivery volume), the high pressure in the circuit will exert an outward thrust on the valve. When this thrust is greater than the resistance force of the second valve core 22 on the valve, the valve will be "broken" (i.e., disengaged from the closed position, forming an exhaust channel). At this time, the excess high-pressure gas in the circuit is discharged through the channel opened by the valve until the pressure in the respiratory circuit drops to a safe range. The valve then closes again under its own elasticity or the recovery of the circuit pressure, completing a "real-time pressure relief" process, ensuring the patient's respiratory safety and the stability of the anesthetic gas delivery.Compared to the cumbersome structure of the pressure relief valve 10 in the prior art, this application greatly simplifies the overall structure through the "separate contact" design and "coaxial component layout"—reducing the number of fixed connection parts and avoiding complex assembly relationships. This not only reduces manufacturing costs but also makes the disassembly and assembly of the pressure relief valve 10 more convenient: maintenance personnel can quickly replace or repair the pressure relief valve 10 without disassembling the core components of the anesthesia machine's breathing circuit (such as valve plates and pipes), reducing equipment downtime, lowering the difficulty and risk of maintenance operations, and significantly reducing the maintenance costs of the anesthesia machine in the long term. The pressure relief valve 10 achieves precise and flexible adjustment of the respiratory airway pressure relief threshold through the transmission logic of "operating valve body assembly 1 → driving the first valve core 21 to move → adjusting the compression of the first elastic element 23 → changing the contact force of the second valve core 22 on the valve plate": When it is necessary to increase the pressure relief threshold (such as for patients with larger body weight and higher airway resistance), the valve body assembly 1 can be operated to drive the first valve core 21 to move closer to the second valve core 22 in the first direction, increasing the compression of the first elastic element 23, so that the contact force of the second valve core 22 on the valve plate increases. At this time, a higher airway pressure is required to break through the valve plate, thereby adapting to the patient's special breathing needs; when it is necessary to decrease the pressure relief threshold (such as for infant patients or people with sensitive airways), the valve body assembly 1 is operated in reverse to reduce the compression of the first elastic element 23, reducing the contact force of the second valve core 22 on the valve plate, so that the airway pressure can be relieved at a lower value, avoiding high pressure from damaging the patient's airway. This adjustability allows the pressure relief valve 10 to adapt to different patient usage scenarios, improving the clinical applicability of the anesthesia machine and further ensuring patient respiratory safety. By adopting a "coaxial component layout" and a "separate contact" design, the pressure relief valve 10 has a more compact overall size, requiring less space inside the anesthesia machine and improving the feasibility of technology promotion.

[0023] like Figure 2As shown, in one embodiment, the first valve core 21 has a first mounting hole 211, and the second valve core 22 has a second mounting hole 221. The first mounting hole 211 and the second mounting hole 221 are connected and both extend along a first direction. The second valve core 22 is slidably connected to the first valve core 21, and the first elastic element 23 is mounted in the first mounting hole 211 and the second mounting hole 221. The connection design of the first mounting hole 211 and the second mounting hole 221 provides a "coaxial built-in installation space" for the first elastic element 23 (such as a spring): both ends of the elastic element are embedded in the first mounting hole 211 and the second mounting hole 221, respectively. The structure of the two holes extending along the first direction can strictly limit the deformation direction of the elastic element—avoiding lateral displacement, bending, or misalignment of the elastic element during compression or release, and ensuring that the elastic force of the elastic element is always transmitted to the second valve core 22 along the first direction. While the second valve core 22 is slidably connected to the first valve core 21, the interconnected structure of the two mounting holes forms a "dual guiding mechanism": on the one hand, the sliding mating surface between the second valve core 22 and the first valve core 21 serves as the primary guiding structure, ensuring that the second valve core 22 moves along the first direction; on the other hand, the first elastic element 23 is assembled within the two holes, and its axial extension characteristics help restrict the movement direction of the second valve core 22, preventing the second valve core 22 from jamming, shifting, or tilting during sliding. It is understandable that the connection between the second valve core 22 and the first valve core 21 can be: the first valve core 21 can be fitted outside the second valve core 22, or the second valve core 22 can be fitted outside the first valve core 21. The first mounting hole 211 and the second mounting hole 221 adopt an "embedded interconnected design," housing the first elastic element 23 inside the valve core, eliminating the need for additional installation space for the elastic element outside the valve core. This "embedded layout" further reduces the overall volume of the valve core assembly 2, making the pressure relief valve 10 more suitable for the compact installation environment inside the anesthesia machine. The number of external parts was reduced, structural redundancy was avoided, and the risk of spatial interference between the pressure relief valve 10 and other components of the anesthesia machine (such as breathing airway pipes and sensors) was reduced. This improved the utilization rate of the internal space of the equipment and provided a structural basis for the subsequent miniaturization upgrade of the pressure relief valve 10.

[0024] like Figure 2-4 and Figure 8 As shown, in one embodiment, the valve body assembly 1 includes a handle 11 and a fixing sleeve 12, the fixing sleeve 12 being sleeved on the outside of the first valve core 21, and the handle 11 being sleeved on the outside of the fixing sleeve 12. The handle 11 is provided with a first transmission structure 111, and the handle 11 can drive the first valve core 21 to rotate around the first axis through the first transmission structure 111. The fixed sleeve 12 is provided with a second transmission structure 121. When the first valve core 21 rotates around the first axis, the fixed sleeve 12 can drive the first valve core 21 to reciprocate along the first direction through the second transmission structure 121. The extension direction of the first axis coincides with the first direction. The first axis is a reference axis passing through the core components of the pressure relief valve 10, and its extension direction completely coincides with the first direction, which is the extension and movement direction of the first valve core 21, the second valve core 22, and the first elastic element 23. The first valve core 21 rotates around the first axis and simultaneously reciprocates along this axis (the first direction), ensuring that the transmission and pressure regulation actions are performed along the same reference direction, avoiding directional deviations that could affect accuracy.

[0025] The nested structure and transmission design of "handle 11 + fixed sleeve 12" makes operation more convenient and labor-saving. Simply rotate the external handle 11 to drive the first valve core 21 to rotate around the first axis via the first transmission structure 111. There is no need to directly push the valve core, which conforms to the ergonomic design and is easy for operators to control. At the same time, the second transmission structure 121 of the fixed sleeve 12 can accurately convert the rotational motion of the first valve core 21 into reciprocating movement along the first direction. The angle of rotating the handle 11 corresponds to the movement distance of the first valve core 21. Based on this, the compression of the first elastic element 23 can be precisely adjusted to achieve fine control of the pressure relief threshold. In addition, the nested form of the fixed sleeve 12 covering the first valve core 21 and the handle 11 covering the fixed sleeve 12 can not only effectively protect the internal transmission components and reduce external impurities or external force interference, but also strictly limit the movement direction of each component to avoid deviation or jamming, which greatly improves the overall stability and service life of the pressure relief valve 10.

[0026] like Figure 2-4 As shown, in one embodiment, the first transmission structure 111 includes a transmission groove 1111, the transmission groove 1111 is open on one side along the first direction, the first valve core 21 includes a first connecting section 212 and a second connecting section 213 connected together, the first connecting section 212 and the second connecting section 213 are arranged sequentially along the first direction, and the second connecting section 213 is provided with a first assembly hole 211. The first connecting section 212 is movably connected to the transmission groove 1111 along the first direction, and the circumferential displacement of the first valve core 21 is limited by the handle 11. When the first valve core 21 rotates around the first axis, the second transmission structure 121 can drive the first valve core 21 to reciprocate along the first direction through the second connecting section 213. The first connecting section 212 of the first valve core 21 can be square, hexagonal, or other polygonal shapes. The transmission groove 1111 is designed as a matching polygonal groove. This "polygonal fit" structure can completely restrict the circumferential displacement of the first valve core 21, preventing slippage between the first valve core 21 and the handle 11. Its transmission principle is similar to turning a bolt with a handle. The handle (handle 11) fits tightly with the polygonal rod of the bolt (first valve core 21) through the polygonal hole. When the handle is turned, the torque can be completely transmitted to the bolt through the polygonal contact surface, ensuring that the first valve core 21 rotates synchronously around the first axis with the handle 11. Secondly, the first connecting section 212 is movably connected to the transmission groove 1111 along the first direction. When the second transmission structure 121 drives the first valve core 21 to reciprocate along the first direction through the second connecting section 213, the polygonal structure will not hinder the axial movement of the first valve core 21, realizing "synchronous rotation and axial movement". This design ensures stable transmission and avoids transmission failure or adjustment deviation caused by slippage. In addition, this structural design is simple and easy to process. The polygonal fit does not require additional positioning or locking parts, which can not only ensure transmission efficiency, but also reduce production difficulty and cost. At the same time, it makes the assembly of the first valve core 21 and the handle 11 more convenient, further improving the overall assembly efficiency and maintenance convenience of the pressure relief valve 10. It ensures that when the operator turns the handle 11, he can accurately control the rotation and movement of the first valve core 21, thereby stably adjusting the compression of the first elastic element 23 and ensuring the accuracy of pressure relief threshold control.

[0027] like Figure 2-5 As shown, in one embodiment, the second transmission structure 121 includes a protrusion 1211, which is disposed on the inner wall of the fixed sleeve 12, and the outer peripheral surface of the second connecting section 213 is provided with a spiral opening groove 2131; or, the second transmission structure 121 includes a spiral opening groove 2131, which is disposed on the inner wall of the fixed sleeve 12, and the outer peripheral surface of the second connecting section 213 is provided with a protrusion 1211. The opening of the slot 2131 faces the protrusion 1211, which is connected to the slot 2131. The principle of the second transmission structure 121 is similar to that of the threaded connection: the cooperation between the protrusion 1211 and the spiral slot 2131 can smoothly convert the rotational motion of the first valve core 21 into reciprocating movement along the first direction, with high transmission efficiency and no jamming. This structure does not require complex parts, is simple to process and assemble, and has low cost. At the same time, the spiral design allows the axial movement distance and rotation angle of the first valve core 21 to correspond precisely, which makes it easy for the operator to precisely adjust the compression of the first elastic element 23 by controlling the rotation amplitude of the handle 11, thereby accurately controlling the pressure relief threshold and ensuring the stability of the airway pressure of the anesthesia machine.

[0028] In one embodiment, the second connecting segment 213 is threadedly connected to the fixed sleeve 12. The principle of the threaded connection in this embodiment is equivalent to the transmission connection principle between the protrusion 1211 and the opening slot.

[0029] like Figure 2-3 As shown, in one embodiment, the valve core assembly 2 further includes a buffer seat 24 and a second elastic member 25. The buffer seat 24 is adapted to abut against the pressure relief member 201. The buffer seat 24 is movably connected to the end of the second valve core 22 away from the first valve core 21 along a first direction. The second elastic element 25 extends along the first direction and is connected between the buffer seat 24 and the fixed sleeve 12. The beneficial effects are significant: the buffer seat 24 can buffer the direct pressure of the second valve core 22 on the pressure-relief component 201, preventing hard contact damage to the pressure-relief component 201; the second elastic element 25 can adapt to pressure fluctuations, assisting in adjusting the pressure of the buffer seat 24, making the pressure relief threshold control more stable; at the same time, the buffer structure can reduce the impact of sudden pressure changes on the valve core assembly 2, extend the component's lifespan, and further ensure the stability of the anesthesia machine's airway pressure.

[0030] like Figure 2As shown, in one embodiment, the handle 11 is movably connected to the fixed sleeve 12 along a first direction. The valve core assembly 2 further includes a push rod 26, which extends along the first direction and passes through the first valve core 21. One end of the push rod 26 is fixedly connected to the second valve core 22, and the other end of the push rod 26 is fixedly connected to the handle 11. The push rod 26 can be fixedly connected to the handle 11 by bolts, and the push rod 26 can be inserted into the connecting groove of the second valve core 22. Under normal conditions, the handle 11 and the fixed sleeve 12 are rotated together through a transmission structure, and the two work together to drive the first valve core 21. When the handle 11 rotates, the first transmission structure 111 drives the first valve core 21 to rotate synchronously around the first axis. At the same time, the fixed sleeve 12 converts the rotational motion of the first valve core 21 into reciprocating movement along the first direction through the second transmission structure 121 (such as the engagement of the protrusion 1211 and the spiral opening groove 2131). During the movement of the first valve core 21, the compression of the first elastic element 23 between it and the second valve core 22 is changed. Then, through the elastic force transmission of the first elastic element 23, the resistance force of the second valve core 22 to the pressure relief element 201 is adjusted, thereby realizing the routine adjustment of the pressure relief threshold of the breathing circuit of the anesthesia machine. In special circumstances (such as jamming of the first elastic element 23, or an abnormal increase in respiratory pressure requiring emergency decompression), the handle 11 can move relative to the fixed sleeve 12 in the first direction (pull the handle 11 outward). Since the push rod 26 extends in the first direction and its two ends are fixedly connected to the handle 11 and the second valve core 22 respectively, the axial movement of the handle 11 will be directly transmitted to the second valve core 22 through the push rod 26, causing the second valve core 22 to move synchronously in the first direction. During this process, the relative position between the second valve core 22 and the pressure-relief component 201 changes, and the resistance of the second valve core 22 to the pressure-relief component 201 is significantly reduced, thereby rapidly reducing the decompression threshold of the respiratory airway, causing the pressure-relief component 201 (such as a valve plate) to open at a lower pressure, timely venting excess pressure in the airway, and avoiding damage to the patient's airway caused by high pressure.

[0031] like Figures 2-5As shown, in one embodiment, the first connecting segment 212 is provided with a hollow structure 2121, which extends along a first direction and communicates with the first mounting hole 211 through a through hole 2122. The hollow structure 2121 opens on the side away from the second connecting segment 213 along the first direction. The handle 11 is provided with a protrusion 112, which extends along the first direction and is connected to the hollow structure 2121. The first valve core 21 can rotate relative to the protrusion 112 around a first axis and can reciprocate relative to the protrusion 112 along the first direction. The push rod 26 extends into the hollow structure 2121 through the through hole 2122 and is connected to the protrusion 112. The hollow structure 2121 of the first connecting section 212 extends along the first direction and is adapted to the protrusion 112 extending in the same direction on the handle 11. By setting the shape of the first connecting section 212, the opening groove 2131, the protrusion 112 and the hollow structure 2121, the circumferential displacement of the first valve core 21 is strictly limited, ensuring that the handle 11 can stably transmit torque to drive the first valve core 21 to rotate synchronously when it rotates, without hindering the smooth movement of the first valve core 21 along the first direction, thus ensuring the stability of pressure regulation under normal conditions; at the same time, the hollow structure 2121 is connected to the first assembly through the through hole 2122. The hole 211 provides a built-in installation channel for the push rod 26. The push rod 26 can pass through the through hole 2122, extend into the hollow structure 2121, and connect with the protrusion 112, so that the push rod 26 is completely built into the mating space between the valve core assembly 2 and the handle 11, avoiding collision damage or interference from impurities caused by exposure, and making the overall structure more compact and integrated. In addition, the opening design on the side of the hollow structure 2121 away from the second connecting section 213 facilitates the assembly of the push rod 26 and the protrusion 112 and the replacement of parts during later maintenance, taking into account transmission reliability, structural compactness, and maintenance convenience. One feasible solution is: the hollow structure 2121 is cylindrical, the outer peripheral surface of the first connecting section 212 is square (with chamfered corners), the opening groove 2131 is oriented in a direction matching the outer peripheral surface of the first connecting section 212, and the protrusion is cylindrical and matches the hollow structure 2121.

[0032] like Figure 2-3 As shown, in one embodiment, a limiting block 122 is provided on the outer peripheral surface of the fixing sleeve 12, and the fixing sleeve 12, the limiting block 122 and the handle 11 enclose and form an accommodating space 3. The accommodating space 3 is provided with a third elastic element 4, which extends along the first direction and connects between the handle 11 and the limiting block 122. The limiting block 122 on the outer periphery of the fixed sleeve 12, together with the handle 11 and the fixed sleeve 12, forms the accommodating space 3. The built-in third elastic element 4 connects the handle 11 and the limiting block 122 along the first direction. When the handle 11 is pulled in special circumstances, the stretching amount of the third elastic element 4 is limited by the limiting block 122, which can prevent the handle 11 from being pulled out excessively, causing the top rod 26 or the second valve core 22 to exceed its displacement, thus preventing the pressure adjustment of the pressure relief component 201 from going out of control. At the same time, under normal conditions, the third elastic element 4 can provide a restoring force for the handle 11, ensuring that the handle 11 is stably attached to the fixed sleeve 12, preventing the handle 11 from shifting due to vibration, etc., and ensuring the stability of normal pressure adjustment. The structure is simple and highly practical.

[0033] like Figure 2-3 As shown, in one embodiment, the pressure relief valve 10 further includes a nut 5 and a fixing seat 6. The fixing seat 6 is sleeved on the outside of the fixing sleeve 12 and fixedly connected thereto. The handle 11 and the fixing seat 6 are arranged sequentially along a first direction. The handle 11 is movably connected to the fixing seat 6 along the first direction. The nut 5 is threadedly connected to the end of the fixing seat 6 away from the handle 11. The fixing seat 6 is sleeved on and fixedly connected to the outside of the fixing sleeve 12, forming a transition carrier for connecting the pressure relief valve 10 and the anesthesia machine body 20. The nut 5 is threadedly connected to the end of the fixing seat 6 away from the handle 11. During assembly, it is only necessary to align the fixing seat 6 with the installation position of the anesthesia machine body 20 and tighten the nut 5 to firmly fix the pressure relief valve 10 as a whole. The operation is simple and efficient, and no complicated tools are required. At the same time, the threaded connection has good disassembly. During subsequent maintenance, the pressure relief valve 10 can be removed by unscrewing the nut 5, which is convenient for disassembly and assembly.

[0034] According to the pressure relief valve 10 provided in the embodiments of this application, when it is necessary to adjust the airway pressure of the anesthesia machine, the valve body assembly 1 is operated to drive the first valve core 21, which is connected to it, to reciprocate along the first direction. Since the first elastic element 23 is connected between the first valve core 21 and the second valve core 22, the movement of the first valve core 21 will directly change the compression of the first elastic element 23, and the change in the compression of the elastic element will correspondingly change its force on the second valve core 22. Since the second valve core 22 is movably connected to the first valve core 21 along the first direction, and its end away from the first valve core 21 abuts against the pressure relief component 201 of the anesthesia machine body 20, the second valve core 22 will adjust the pressure on the pressure relief component under the action of elastic force, and finally realize the function of adjusting the pressure relief state in real time according to the change of airway pressure, ensuring a stable anesthetic gas delivery environment and ensuring the patient's respiratory safety. This application simplifies the overall structure by designing the valve core assembly 2 as a combination of a first valve core 21, a second valve core 22, and a first elastic element 23. This greatly facilitates the disassembly and assembly of the pressure relief valve 10, reducing maintenance difficulty and cost. At the same time, by using the valve body assembly 1 to drive the first valve core 21 to move and adjust the compression of the first elastic element 23, thereby controlling the pressure of the second valve core 22 on the pressure relief element, precise and real-time adjustment of airway pressure can be achieved, effectively ensuring patient respiratory safety and the stability of anesthetic gas delivery, and improving the reliability of the anesthesia machine.

[0035] In addition, such as Figure 1-8 As shown in the figure, this application provides an anesthesia machine, including a main body 20, a pressure relief component 201, and a pressure relief valve 10 as described in the above embodiment. The pressure relief component 201 is disposed on the main body 20, and the end of the second valve core 22 away from the first valve core 21 abuts against the pressure relief component 201. The end of the second valve core 22 of the pressure relief valve 10 away from the first valve core 21 abuts against the pressure relief component 201 on the main body 20, which can accurately adjust the opening pressure threshold of the pressure relief component 201, ensuring that the respiratory airway pressure of the anesthesia machine is always within a safe range. This ensures stable delivery of anesthetic gas and avoids damage to the patient's airway caused by high pressure in the airway, thereby improving the safety and reliability of the anesthesia process. The pressure relief valve 10 itself has advantages such as simple structure, convenient disassembly and maintenance, precise adjustment, and rapid emergency response. After being assembled with the main body 20 of the anesthesia machine, it can reduce the overall maintenance difficulty and cost of the anesthesia machine, extend the service life of the equipment, and adapt to the pressure adjustment needs of different clinical scenarios, thereby improving the clinical applicability of the anesthesia machine. It should be noted that the pressure relief component 201 can be a valve plate. The pressure relief component 201 is prior art and will not be described in detail in this application.

[0036] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A pressure relief valve, characterized in that, It includes a valve body assembly and a valve core assembly. The valve core assembly includes a first valve core, a second valve core, and a first elastic element. The first elastic element, the first valve core, and the second valve core all extend along a first direction. The first valve core is drivenly connected to the valve body assembly, the second valve core is movably connected to the first valve core along the first direction, the first elastic element is connected between the first valve core and the second valve core, and the end of the second valve core away from the first valve core is adapted to abut against the pressure relief component on the main body of the anesthesia machine; Operating the valve body assembly can drive the first valve core to reciprocate along the first direction to adjust the compression of the first elastic element, thereby adjusting the pressure of the second valve core on the pressure-relieving element.

2. The pressure relief valve according to claim 1, characterized in that, The first valve core is provided with a first mounting hole, and the second valve core is provided with a second mounting hole. The first mounting hole and the second mounting hole are connected and both extend along the first direction. The second valve core is slidably connected to the first valve core, and the first elastic element is assembled in the first mounting hole and the second mounting hole.

3. The pressure relief valve according to claim 2, characterized in that, The valve body assembly includes a handle and a fixing sleeve, the fixing sleeve being sleeved on the outside of the first valve core, and the handle being sleeved on the outside of the fixing sleeve; The handle is provided with a first transmission structure, and the handle can drive the first valve core to rotate around a first axis through the first transmission structure. The fixed sleeve is provided with a second transmission structure. When the first valve core rotates around the first axis, the fixed sleeve can drive the first valve core to reciprocate along the first direction through the second transmission structure; wherein, the extension direction of the first axis coincides with the first direction.

4. The pressure relief valve according to claim 3, characterized in that, The first transmission structure includes a transmission groove, which opens on one side along the first direction. The first valve core includes a first connecting section and a second connecting section connected together. The first connecting section and the second connecting section are arranged sequentially along the first direction. The second connecting section is provided with the first assembly hole. The first connecting segment is movably connected to the transmission groove along the first direction, and the circumferential displacement of the first valve core is limited by the handle; When the first valve core rotates around the first axis, the second transmission structure can drive the first valve core to reciprocate along the first direction through the second connecting section.

5. The pressure relief valve according to claim 4, characterized in that, The second transmission structure includes a protruding post disposed on the inner wall of the fixed sleeve, and the outer peripheral surface of the second connecting section is provided with a spiral opening groove; or, the second transmission structure includes a spiral opening groove disposed on the inner wall of the fixed sleeve, and the outer peripheral surface of the second connecting section is provided with a protruding post. The opening of the slot faces the protrusion, and the protrusion is driven to the slot.

6. The pressure relief valve according to claim 3, characterized in that, The valve core assembly further includes a buffer seat and a second elastic element. The buffer seat is adapted to abut against the pressure relief element and is movably connected to the end of the second valve core away from the first valve core along the first direction. The second elastic element extends along the first direction and is connected between the buffer seat and the fixed sleeve.

7. The pressure relief valve according to claim 3, characterized in that, The handle is movably connected to the fixed sleeve along the first direction. The valve core assembly also includes a push rod that extends along the first direction and passes through the first valve core. One end of the push rod is fixedly connected to the second valve core, and the other end of the push rod is fixedly connected to the handle.

8. The pressure relief valve according to claim 7, characterized in that, The outer peripheral surface of the fixed sleeve is provided with a limiting block, and the fixed sleeve, the limiting block and the handle form an accommodating space; The accommodating space is provided with a third elastic element, which extends along the first direction and connects between the handle and the limiting block.

9. The pressure relief valve according to claim 3, characterized in that, The pressure relief valve also includes a nut and a fixed seat. The fixed seat is sleeved on the outside of the fixed sleeve and fixedly connected thereto. The handle and the fixed seat are arranged in sequence along the first direction. The handle is movably connected to the fixed seat along the first direction. The nut is threadedly connected to the end of the fixed seat away from the handle.

10. An anesthesia machine, characterized in that, The device includes a main body, a pressure relief component, and a pressure relief valve as described in any one of claims 1 to 9, wherein the pressure relief component is disposed on the main body, and the end of the second valve core away from the first valve core abuts against the pressure relief component.

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