APL valve and anesthesia machine

Abstract

The invention relates to the technical field of medical instruments, in particular to an APL valve and an anaesthesia machine. The APL valve comprises a valve outer shell, a valve inner shell assembly, a valve base assembly and a valve heightening seat assembly, and the valve base assembly and the valve heightening seat assembly are fixedly connected to form a base of the APL valve; the valve shell is provided with a cylindrical knob part and a scale marking part extending in an umbrella shape at the bottom end of the knob part; the valve inner shell assembly is located in the valve outer shell and comprises an inner shell, an inner shell base assembly and an inner shell functional assembly. The inner shell is fixedly connected with the valve outer shell and moves along with the valve outer shell. The inner shell base assembly is located in the inner shell and detachably connected with the valve base assembly. The inner shell functional assembly is located in the inner shell base assembly and is driven by the valve outer shell and the inner shell to axially move relative to the inner shell base assembly so as to adjust the opening pressure of the APL valve. The APL valve and the anaesthesia machine provided by the invention have the advantages of miniaturization, accurate adjustment, quick disassembly and assembly, pressure relief protection, user friendliness and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an APL valve and an anesthesia machine. Background Art

[0002] Anesthesia breathing circuit is a circuit formed by connecting the gas outlet of an anesthesia machine to the user's respiratory tract, which is called an anesthesia breathing circuit.

[0003] The commonly used ventilation modes in the anesthesia breathing circuit are manual ventilation and mechanical ventilation modes. The APL (adjustable pressure limiting) valve plays a crucial role. Its core function is to control the gas pressure in the manual drive gas branch of the anesthesia machine, and it is an adjustable pressure limiting valve.

[0004] The operation of the APL valve is based on a simple mechanical principle: it is equipped with an air inlet and an air outlet, and the valve plate assembly closes the air inlet under the elastic force generated by the elastic member. Once the pressure at the air inlet exceeds the elastic force of the elastic member set by the user's screwing, the gas will push open the valve plate assembly and be released through the air outlet to adjust and stabilize the gas pressure.

[0005] However, the APL valve also faces technical challenges during actual operation. After the user screws and sets the elastic force of the elastic member, during the gas release process, the gas can only return to the elastic force set by the user. But when the user setting value is too high, in an emergency, it is impossible to quickly adjust the pressure of the APL valve to atmospheric pressure instantaneously; furthermore, due to the protruding height of the external part of the APL valve, when disinfecting and sterilizing the APL, the user needs to disassemble the APL valve from the circuit component.

[0006] Therefore, the problems of rapid pressure relief and rapid disassembly of the APL valve during its operation need to be solved urgently to improve the overall performance of the anesthesia machine and the user experience. Summary of the Invention

[0007] The purpose of the present invention is to overcome the above-mentioned defects of the prior art, and thus provide an APL valve and an anesthesia machine.

[0008] To solve the above technical problems, the APL valve provided by the technical solution of the present invention includes: a valve outer shell, a valve inner shell assembly, a valve base assembly, and a valve heightening seat assembly, wherein,

[0009] The valve base assembly and the valve heightening seat assembly are fixedly connected to form the base of the APL valve;

[0010] The valve outer shell has a cylindrical knob portion and a scale marking portion extending in an umbrella shape at the bottom end of the knob portion;

[0011] The valve inner shell assembly is located inside the valve outer shell and includes: an inner shell, an inner shell base assembly, and an inner shell functional assembly; wherein,

[0012] The inner shell is fixedly connected to the valve outer shell and moves with the valve outer shell;

[0013] The inner shell base assembly is located inside the inner shell and is detachably connected to the valve base assembly;

[0014] The inner shell functional assembly is located inside the inner shell base assembly and axially moves relative to the inner shell base assembly driven by the valve outer shell and the inner shell to adjust the opening pressure of the APL valve.

[0015] As an improvement of the above APL valve, the inner shell base assembly includes an inner shell base and a guide post; wherein, the inner shell base is located inside the inner shell and is detachably connected to the valve base assembly; the guide post is fixedly arranged on the inner wall of the inner shell base; the inner shell functional assembly includes: a valve core rod, a valve core, a guide nut and a pressure spring; wherein, the upper end of the valve core rod is fixedly connected to the valve outer shell, and the lower end is connected to the valve core; the guide nut is sleeved on the valve core rod, is slidably connected to the valve core rod in the axial direction, and is driven to rotate by the valve core rod in the circumferential direction; the chute cooperates with the guide post, so that the guide nut moves axially along the inner shell base assembly when rotating; wherein, the valve outer shell drives the valve core rod to rotate, and then drives the guide nut to rotate; one end of the pressure spring abuts against the guide nut, and the other end abuts against the valve core, and the pre-tightening force provided by the pressure spring for the valve core is adjusted by adjusting the axial position of the guide nut; wherein, the valve core lifts to relieve pressure when the internal pressure of the circuit is greater than the pre-tightening force provided by the pressure spring, and resets after the pressure drops.

[0016] As an improvement of the above APL valve, the guide nut is located at the corresponding position of the knob part of the valve outer shell.

[0017] As an improvement of the above APL valve, the inner shell functional assembly further includes: a lifting spring; wherein, a flange is arranged on the valve core rod above the guide nut; one end of the lifting spring abuts against the inner shell base, and the other end abuts against the flange of the valve core rod; when the valve outer shell is lifted axially by an external force, the valve core rod and the valve core are driven to move upward, so that the APL valve quickly relieves pressure, and then the internal pressure of the circuit is instantaneously released to the atmospheric pressure; after the external force is removed during pressure relief, the valve core rod is axially moved by the elastic force of the lifting spring to reset the valve core, so that the APL valve restores the original set opening pressure.

[0018] As an improvement of the above APL valve, a first shock-absorbing washer is arranged between the pressure spring and the guide nut, and a second shock-absorbing washer may be arranged between the pressure spring and the valve core.

[0019] As an improvement to the above APL valve, the inner shell base assembly further includes: a feel washer. A feel washer sealing groove is provided on the outer wall of the inner shell base, and the feel washer is installed in the sealing groove to provide a damping feeling when rotating the valve housing.

[0020] As an improvement to the above APL valve, the inner valve shell assembly further includes: an inner valve shell feel assembly; wherein, the inner valve shell feel assembly includes: a feel spring, a support post, and a support post baffle; an assembly hole is provided at the bottom edge of the inner shell, the feel spring is located in the assembly hole, the first end of the support post extends through the feel spring, and the second end abuts against the support post baffle; the support post baffle is fixedly connected to the inner shell; a semi-circular protrusion extending out of the support post baffle is further provided at the second end of the support post; the support post is driven by the inner shell to perform a circumferential rotation; several support post grooves are provided on the inner shell base on the rotation circumference of the support post; when the valve housing drives the support post to rotate through the inner shell, the support post impacts the support post grooves of the inner shell base to provide sound feedback during the process of adjusting the pressure.

[0021] As an improvement to the above APL valve, the inner shell base and the valve base assembly are detachably connected through a fastening nut cover and a guide pin; wherein, a positioning hole is provided at the bottom of the inner shell base along the axial direction of the inner shell base, one end of the guide pin is inserted into the positioning hole of the inner shell base along the axial direction of the inner shell base, and the other end is inserted into the valve base assembly to realize the circumferential fixation of the inner shell base and the valve base assembly; a flange is provided on the outer wall of the inner shell base near the bottom, the fastening nut cover is threadedly connected to the valve base assembly, and the axial fixation of the inner shell base and the valve base assembly is realized by squeezing the flange on the outer wall of the inner shell base.

[0022] As an improvement to the above APL valve, a male housing buckle is provided inside the scale marking part of the valve housing, and a pressure scale dial is provided outside; a female inner shell buckle matching the male housing buckle is provided at the corresponding position on the outer side of the inner shell; after the male housing buckle and the female inner shell buckle are engaged, the inner shell is fixedly connected to the valve housing and moves with the valve housing; the APL valve further includes a scale dial, wherein the scale dial is located below the valve housing, sleeved outside the inner shell base, and fixedly connected to the inner shell base; the scale dial is provided with scale lines.

[0023] To achieve another object of the present invention, the present invention further provides an anesthesia machine including the above APL valve.

[0024] Compared with the prior art, the advantages of the present invention are that the APL valve provided by the present invention and the anesthesia machine including the APL valve have the advantages of miniaturization, precise adjustment, quick disassembly and assembly, pressure relief protection and user-friendliness. The valve housing and the inner housing of the present invention are both composed of a cylindrical part and an umbrella part. The guiding nut is arranged inside the inner housing base and is located at the corresponding position of the cylindrical part, making the APL valve more compact and smaller in volume; the inner housing assembly of the valve is closely matched with the valve housing, and the rotating housing can adjust the valve core pressure to achieve precise control; the quick-disassembly design is convenient for maintenance and cleaning, and improves the service life; it has an instant pressure relief function, which can quickly reduce the loop pressure in case of emergency and enhance safety; the feel washer and sound feedback design make the operation more intuitive and avoid misoperation. In addition, the pressure dial clearly shows the set pressure, enhancing the visual adjustment experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a schematic diagram of the overall structure of the APL valve provided by an embodiment of the present invention;

[0026] Figure 2 is the sectional view along Figure 1 the tangent line A-A in

[0027] Figure 3 FIG. is an exploded view of the APL valve;

[0028] Figure 4 FIG. is a schematic diagram of the installation of the feel washer 8241;

[0029] Figure 5 FIG. is a schematic diagram of the installation of the support column 8223;

[0030] Figure 6 FIG. is a schematic diagram of the position of the support column groove 8243a;

[0031] Figure 7 FIG. is a schematic diagram of the installation of the male housing buckle 81a and the female inner housing buckle 8221a;

[0032] Figure 8 FIG. is a schematic diagram of the installation of the inner housing base 8243 and the dial 827;

[0033] Figure 9 FIG. is a position relationship diagram of the valve housing 81 and the valve heightening seat assembly 84;

[0034] Figure 10 FIG. is a schematic diagram after the APL valve is installed on the anesthesia machine. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The following further illustrates the technical solutions provided by the present invention in conjunction with embodiments.

[0036] Embodiment 1

[0037] The APL valve provided in this embodiment will be described in detail below in conjunction with the accompanying drawings.

[0038] The APL valve provided in this embodiment is mainly divided into six parts, as Figures 1-3 shown, including: valve outer shell 81, valve inner shell assembly 82, valve base assembly 83, valve heightening seat assembly 84, first fastening screw 85, and second fastening screw 86.

[0039] The valve base assembly 83 and the valve heightening seat assembly 84 are fixedly connected to jointly form the base of the APL valve.

[0040] The valve inner shell assembly 82 is arranged inside the valve outer shell 81. The valve outer shell 81 has a cylindrical knob part and a scale marking part extending in an umbrella shape at the bottom end of the knob part. As Figure 7 shown, a shell male buckle 81a is arranged inside the scale marking part. As Figure 1 and Figure 3 shown, a pressure scale dial 81b is arranged on the outside.

[0041] As Figures 2-3 shown, the valve inner shell assembly 82 includes: third fastening screw 821, valve inner shell feel assembly, inner shell functional assembly, inner shell base assembly, first set screw 825, adapter plate 826, scale dial 827, and fastening nut cover 828.

[0042] The valve inner shell feel assembly includes: inner shell 8221, feel spring 8222, support column 8223, support column baffle 8224, and fourth fastening screw 8225. As Figures 2-3 shown, the inner shell 8221 has a shape that fits the inside of the valve outer shell 81, including an inner shell cylindrical part and an inner shell umbrella part. As Figure 7 shown, an inner shell female buckle 8221a that matches the shell male buckle 81a is arranged on the outside of the inner shell umbrella part of the inner shell 8221. After the shell male buckle 81a and the inner shell female buckle 8221a are latched, the inner shell 8221 is fixedly connected to the valve outer shell 81 and moves with the valve outer shell 81.

[0043] As Figure 5As shown in the figure, an assembly hole is provided at the bottom edge of the inner shell umbrella part of the inner shell 8221. A feel spring 8222 is placed in the assembly hole. The feel spring 8222 is sleeved on a support column 8223. The upper end of the support column 8223 extends into the assembly hole of the inner shell 8221, and the lower end contacts a support column baffle 8224. The support column baffle 8224 is detachably connected to the inner shell 8221 by a fourth fastening screw 8225, so as to press the support column 8223 between the support column baffle 8224 and the top end of the assembly hole of the inner shell 8221, enabling the support column 8223 to rotate with the inner shell 8221. The support column 8223 is further provided with a semi-circular protrusion passing through the support column baffle 8224. During assembly, first install the feel spring 8222 and the support column 8223 into the assembly hole of the inner shell 8221, then press the support column 8223 with the support column baffle 8224, and finally fix it with the fourth fastening screw 8225. After such installation, the feel component of the valve inner shell forms an integral body. The adapter plate 826 is located at the inner top of the inner shell 8221 and is fixedly connected to the inner shell 8221 by a first fastening screw 85.

[0044] As Figures 2-3 shown, the inner shell base assembly includes: a feel washer 8241, a guide post 8242, an inner shell base 8243, a first sealing ring 8244, and a guide pin 8245.

[0045] As Figures 2-3 shown, the inner shell base 8243 is hollow inside, located inside the inner shell 8221, and is fixedly connected to the valve base assembly 83. The outer wall of the inner shell base 8243 is provided with a feel washer sealing groove along the circumferential direction. As Figure 4 shown, the feel washer 8241 is installed into the feel washer sealing groove. The feel washer contacts the inner wall of the inner shell 8221 and provides friction when the valve outer shell 81 drives the inner shell 8221 to rotate.

[0046] As Figures 2-3 shown, the guide post 8242 is inserted into the inner wall of the inner shell base 8243 along the radial direction of the inner shell base 8243 and is located at the corresponding position of the inner shell cylindrical part of the inner shell 8221. The guide post 8242 can be pressed into the inner shell base 8243 during machining.

[0047] As Figures 2-3As shown in the figure, one end of the guiding pin shaft 8245 is inserted into the threaded hole at the bottom of the inner shell base 8243 along the axial direction of the inner shell base 8243, and the other end is inserted into the valve base assembly 83 to achieve the circumferential fixation of the inner shell base 8243 and the valve base assembly 83. A flange is provided on the outer wall of the inner shell base 8243 near the bottom. The fastening nut cover 828 is threadedly connected to the valve base assembly 83, and by pressing the flange on the outer wall of the inner shell base 8243, the axial fixation of the inner shell base 8243 and the valve base assembly 83 is achieved. A groove for accommodating the first sealing ring 8244 is provided on the outer wall of the inner shell base 8243 to seal the gap between the inner shell base 8243 and the valve base assembly 83.

[0048] As Figure 6 shown in the figure, on the rotation circumference of the support column 8223 of the inner shell base 8243, a number of support column grooves 8243a are provided. When the valve outer shell 81 drives the support column 8223 to rotate through the inner shell 8221, the support column 8223 impacts the support column groove 8243a of the inner shell base 8243 to provide sound feedback during the process of adjusting the pressure.

[0049] As Figures 2-3 shown in the figure, the dial 827 is located below the valve outer shell 81, sleeved on the outside of the inner shell base 8243, and fixedly connected to the inner shell base 8243. The dial 827 is provided with scale lines 827a. Specifically, as Figure 8 shown in the figure, the dial 827 includes scale lines 827a, limit bumps 827b, and limit block guide grooves 827c. The inner shell base 8243 includes support column grooves 8243a, scale line orientation blocks 8243b, bump limit grooves 8243c, and limit blocks 8243d. The assembly relationship between the dial 827 and the inner shell base 8243 is as follows: the scale lines 827a and the scale line orientation blocks 8243b in the same direction limit the radial and circumferential positions of the dial 827 and the inner shell base 8243 through the limit block guide grooves 827c and the limit blocks 8243d, while the limit bumps 827b and the bump limit grooves 8243c limit the axial positions of the dial 827 and the inner shell base 8243, so that the dial 827 is fixed on the inner shell base 8243.

[0050] As Figures 2-3 shown in the figure, the inner shell functional components include: a lifting spring 8231, a valve core rod 8232, a guiding nut 8233, a first shock-absorbing washer 8234, a pressure spring 8235, a valve core lock nut 8236, a set screw 8237, a second shock-absorbing washer 8238, and a valve core 8239.

[0051] As Figures 2-3As shown, the guiding nut 8233 is located inside the inner shell base 8243. The sliding groove 8233a of the guiding nut 8233 matches the guiding column 8242. When the guiding nut 8233 rotates, it moves up and down along the axial direction of the inner shell base 8243.

[0052] As Figures 2-3 shown, the top end of the valve core rod 8232 passes upward through the guiding nut 8233 and is fixedly connected to the valve housing 81 by the third fastening screw 821. The bottom end of the valve core rod 8232 passes through the guiding nut 8233 and is fixedly connected to the valve core 8239 by the valve core lock nut 8236 and the set screw 8237. When the valve core rod 8232 rotates, it drives the guiding nut 8233 to rotate. The valve core rod 8232 is slidably connected to the guiding nut 8233 in the axial direction. A flange is provided on the valve core rod 8232 above the guiding nut 8233. The lifting spring 8231 is sleeved on the valve core rod 8232 above the guiding nut 8233. Its upper end abuts against the inner shell base 8243, and its lower end abuts against the flange of the valve core rod 8232. The pressure spring 8235 is sleeved on the valve core rod 8232 below the guiding nut 8233. Its upper end abuts against the guiding nut 8233, and its lower end abuts against the valve core 8239. A second shock-absorbing washer 8238 can also be provided between the lower end of the pressure spring 8235 and the valve core 8239. A first shock-absorbing washer 8234 can also be provided between the upper end of the pressure spring 8235 and the guiding nut 8233.

[0053] After the inner shell assembly 82 is assembled, it is fixed to the valve housing 81. The valve base assembly 83 and the valve heightening seat assembly 84 are fixedly connected by the first fastening screw 85 to jointly form the base of the APL valve. The valve heightening seat assembly 84 is inserted into the circuit assembly 10 of the anesthetic machine as Figure 10 shown, and then fixed with the second fastening screw 86. The valve inner shell assembly 82 in the valve housing 81 is inserted into the valve base assembly 83 via the guiding column 8245 and then locked by the fastening nut cover 828. The reverse process of this process can realize the quick disassembly of the APL valve, leaving the valve heightening seat assembly 84 on the circuit assembly 10, and the rest of the valve can be another whole, which is convenient for the staff to clean and disinfect.

[0054] When the support column 8223 slides on the inner shell base 8243 under the action of the feel spring 8222, the inner shell base 8243 is provided with a support column groove 8243a, which can enable the support column 8223 to move repeatedly in the support column groove 8243a and on the plane, increasing the screwing click sound. There is also the damping effect of the feel washer 8241, making the mechanical APL valve have a damping feeling when rotating, which conforms to the ergonomic design.

[0055] Due to the elastic force of the pressure spring 8235, the valve core 8239 fits and seals with the valve base assembly 83. When the force F1 acting on the sealing surface of the valve core 8239 by the internal pressure P1 of the circuit is greater than or equal to the spring force F2 generated by the pressure spring 8235, the valve core 8239 lifts to relieve pressure, causing the internal pressure P1 of the circuit to rapidly drop. When it equals the spring force F2, the valve core 8239 resets and continues to fit and seal with the valve base assembly 83.

[0056] The male housing buckle 81a of the valve housing 81 is locked with the female housing buckle 8221a of the inner housing 8221. When it is necessary to rapidly relieve the internal pressure P1 of the circuit to atmospheric pressure, the valve housing 81 can be pulled up, further driving the inner valve housing assembly 82 to lift, and further driving the valve core 8239 away from the valve base assembly 83. After releasing the hand, the inner valve housing assembly 82 resets through the lifting spring 8231.

[0057] Installation method

[0058] Inner valve housing feel component: During assembly, first install the feel spring 8222 and the support column 8223 into the assembly holes of the inner housing 8221, then press the support column 8223 with the support column baffle 8224, and finally fix it with a fastening screw.

[0059] Inner housing functional component: During assembly, first place the shock-absorbing washer 8238 into the valve core 8239, then sequentially install the guiding nut 8233, the washer 8234, and the pressure spring 8235 from below the valve core rod 8232, then insert the valve core 8239 after squeezing the pressure spring 8235 into the inner hole of the valve core rod 8232. Next, place the valve core lock nut 8236 from the upper end of the valve core rod 8232, fix the valve core lock nut 8236 with the valve core 8239, then screw the set screw 8237 into the upper end of the valve core lock nut 8236, and finally install the lifting spring 8232 into the upper end of the valve core rod 8232.

[0060] Inner housing base component: During assembly, sequentially install the feel washer 8241 and the first sealing ring 8244 into the sealing ring groove of the inner housing base 8243, insert the guiding pin shaft 8245 into the threaded hole of the inner housing base 8243, and the guiding column 8242 has been pressed into the inner housing base 8243 during machining.

[0061] Inner housing assembly 82: During assembly, first insert the inner housing functional component into the inner housing base component, then install the adapter plate 826 into the inner housing base component, then fix the adapter plate 826 with the inner housing functional component using the first set screw 825. Then, sequentially install the fastening nut cover 828 and the scale plate 827 from the upper part of the inner housing base component. Next, install the inner housing base component from the lower end into the inner valve housing feel component, and finally fix it with the third fastening screw 821.

[0062] Assembly of the mechanical APL valve and the circuit component 10: During assembly, first install the valve heightening seat component 84 into the circuit component 10, then fix it with the second fastening screw 86. Next, install the valve base component 83 into the valve heightening seat component 84 through the guiding pin shaft 8245 and fix it with the first fastening screw 85. Then, install the inner shell component 82 into the valve base component 83 and fix it by screwing the fastening nut cover 828. Finally, insert the valve outer shell 81 from above the inner shell component 82 and fix it through the male buckle 81a of the outer shell and the female buckle 8221a of the inner shell.

[0063] Application method

[0064] a. Function of specific pressure relief: By rotating the valve outer shell 81, on the one hand, the pressure scale dial 81b (specific indication not given) corresponds to the scale line 827a, thus giving a rated pressure; on the other hand, the inner shell base 8243 of the inner shell base component and the valve base component 83 are fixed. The chute 8233a of the guiding nut 8233 therein can rotate around the guiding column 8242 with the rotation of the valve outer shell 81, causing the guiding nut 8233 to rise or fall, thereby releasing or squeezing the pressure spring 8235, and further squeezing or releasing the valve core 8239, so that the opening pressure between the valve core 8239 and the valve base component 83 decreases or increases.

[0065] b. Lifting function: By pulling up the valve outer shell 81, drive the inner shell component 82 and the valve core rod 8232 to rise. The valve core rod 8232 squeezes the lifting spring 8231 and drives the valve core 8239 to rise, so as to move away from the valve base component 83 to achieve the pressure relief function; after releasing the valve outer shell 81, it resets through the lifting spring 8231.

[0066] c. Quick disassembly function: As Figure 9 shown, by screwing the fastening nut cover 828, the upper part and the lower part of the mechanical APL valve can be separated. The valve heightening seat component 84 and the valve base component 83 remain on the 10 circuit component, and components such as the valve outer shell 81 are removed as a whole, which can facilitate the cleaning and disinfection of the mechanical APL valve.

[0067] Embodiment 2

[0068] This embodiment provides an anesthesia machine, including the APL valve provided in Embodiment 1.

[0069] The present invention has the following advantages:

[0070] The APL valve provided in this embodiment and the anesthesia machine including this APL valve are designed such that by lifting the valve cover, the pressure can be quickly released to atmospheric pressure, and the set value can be restored by simply releasing the hand, which simplifies the user operation. In addition, in order to meet the user's need for cleaning and disinfection, the present invention designs a quick-disassembly structure. Without tools, the user can disassemble the APL valve from the circuit component through simple operations, meeting the requirement that the components of the anesthesia breathing circuit can be cleaned and disinfected. At the same time, the operating size of the head of the APL valve in the present invention is smaller and more compact than that of traditional valves, making it easier for users to operate.

[0071] The APL valve provided by the present invention is provided with the function of screwing touch, which enables simple user operation and conforms to ergonomics; it is provided with the function of screwing contacts, which adds sound feedback during the process of the user setting the pressure; it is provided with the function of opening pressure, enabling the user to quickly set at the commonly used pressure set value; it is provided with the function of lifting for quick pressure relief, enabling the user to instantly return the airway pressure to atmospheric pressure at any set value of the opening pressure, and restoring the set opening pressure value when resetting.

[0072] Regarding the function of lifting for quick pressure relief, since traditional mechanical APL valves cannot achieve the function of quick pressure release, which may increase the risk of emergencies, the present invention makes up for these deficiencies in design.

[0073] Regarding the quick-disassembly function for easy disinfection, in traditional designs, the mechanical APL valve is fixed to the circuit component by screw fastening. During disinfection, tools are required to disassemble the mechanical APL valve from the circuit component, which increases the inconvenience for medical operators. The present invention can well solve this problem.

[0074] Regarding the feature of miniaturization, the valve housing 81 and the inner housing 8221 of the APL valve provided by the present invention are both composed of a cylindrical part and an umbrella part. The guiding nut 8233 is arranged inside the inner housing base 8243 and is located at the corresponding position of the cylindrical part, making the APL valve more compact and smaller in volume.

[0075] The device structure of the present invention is original. This improved design significantly improves the practicability, safety, and maintenance convenience of the breathing circuit module, making it more adaptable to the strict requirements of the medical environment. All those applying the idea of the present invention fall within the protection scope of the present invention.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An APL valve, comprising: Valve housing, valve inner housing assembly, valve base assembly and valve raised seat assembly, wherein: The valve base assembly and the valve heightening seat assembly are fixedly connected to form the base of the APL valve; The valve housing has a cylindrical knob portion, and a scale marking portion extending in an umbrella shape at the bottom end of the knob portion; The valve inner shell component is located inside the valve outer shell, and includes: an inner shell, an inner shell base component and an inner shell functional component; wherein, The inner shell is fixedly connected to the valve outer shell and moves with the valve outer shell; The inner shell base assembly is located inside the inner shell and is detachably connected to the valve seat assembly; The inner shell functional component is located inside the inner shell base component, and is driven by the valve outer shell and the inner shell to move axially relative to the inner shell base component to adjust the opening pressure of the APL valve.

2. The APL valve according to claim 1, characterized in that: The inner shell base assembly includes an inner shell base and a guide column; wherein, The inner shell base is located inside the inner shell and is detachably connected to the valve base assembly; the guide column is fixedly arranged on the inner wall of the inner shell base; The inner shell functional component includes: a valve core rod, a valve core, a guide nut and a pressure spring; wherein, The upper end of the valve core rod is fixedly connected to the valve housing, and the lower end is connected to the valve core; The guide nut is sleeved on the valve core rod, is slidably connected with the valve core rod in the axial direction, and is driven to rotate by the valve core rod in the circumferential direction; The slide groove cooperates with the guide column so that the guide nut moves axially along the inner shell base assembly when rotating; wherein the valve shell drives the valve core rod to rotate, thereby driving the guide nut to rotate; One end of the pressure spring abuts against the guide nut, and the other end abuts against the valve core. The preload force provided by the pressure spring to the valve core is adjusted by adjusting the axial position of the guide nut; wherein the valve core is lifted to release pressure when the internal pressure of the circuit is greater than the preload force provided by the pressure spring, and is reset after the pressure is reduced.

3. The APL valve according to claim 2, characterized in that: The guide nut is located at a position corresponding to the knob portion of the valve housing.

4. The APL valve according to claim 2, characterized in that: The inner shell functional component also includes: a lifting spring; wherein the valve core rod located on the upper side of the guide nut is provided with a flange; one end of the lifting spring abuts against the inner shell base, and the other end abuts against the flange of the valve core rod; when the valve outer shell is lifted axially by an external force, the valve core rod and the valve core are driven to move upward, so that the APL valve is quickly depressurized, and then the internal pressure of the circuit is instantly released to atmospheric pressure; after the pressure is relieved, the external force is removed, and the valve core rod is pushed axially by the elastic force of the lifting spring, so that the valve core is reset, thereby restoring the APL valve to the originally set opening pressure.

5. The APL valve according to claim 2, characterized in that: A first shock-absorbing washer is arranged between the pressure spring and the guide nut, and a second shock-absorbing washer may be arranged between the pressure spring and the valve core.

6. The APL valve according to claim 2, characterized in that: The inner shell base assembly further comprises a hand-feeling washer, the outer wall of the inner shell base is provided with a hand-feeling washer sealing groove, and the hand-feeling washer is installed in the sealing groove to provide a damping feeling when the valve outer shell is rotated.

7. The APL valve according to claim 2, characterized in that: The valve inner shell component also includes: a valve inner shell feel component; wherein, The valve inner shell hand feeling component includes: a hand feeling spring, a support column and a support column baffle; The bottom edge of the inner shell is provided with an assembly hole, the hand-feel spring is located in the assembly hole, the first end of the support column extends through the hand-feel spring, and the second end abuts against the support column baffle; the support column baffle is fixedly connected to the inner shell; The second end of the support column is also provided with a semicircular protrusion extending from the support column baffle; the support column is driven by the inner shell to perform circular rotation; The inner shell base is provided with a plurality of support column grooves on the rotation circumference of the support column; when the valve outer shell drives the support column to rotate through the inner shell, the support column hits the support column groove of the inner shell base to provide sound feedback during the pressure adjustment process.

8. The APL valve according to claim 2, characterized in that: The inner shell base and the valve base assembly are detachably connected through a fastening nut cover and a guide pin shaft; wherein, A positioning hole is set at the bottom of the inner shell base along the axial direction of the inner shell base, one end of the guide pin shaft is inserted into the positioning hole of the inner shell base along the axial direction of the inner shell base, and the other end is inserted into the valve base assembly to achieve circumferential fixation of the inner shell base and the valve base assembly; a flange is set on the outer wall of the inner shell base close to the bottom, the fastening nut cover is threadedly connected with the valve base assembly, and the inner shell base and the valve base assembly are fixed by squeezing the flange of the outer wall of the inner shell base.

9. The APL valve according to claim 1, characterized in that The inner side of the scale mark portion of the valve outer shell is provided with an outer shell male buckle, and the outer side is provided with a pressure dial surface; the outer side of the inner shell is provided with an inner shell female buckle matching the outer shell male buckle at a corresponding position of the outer shell male buckle; after the outer shell male buckle and the inner shell female buckle are clamped, the inner shell is fixedly connected to the valve outer shell and moves with the valve outer shell; the APL valve also includes a dial, wherein the dial is located below the valve outer shell, sleeved on the outer side of the inner shell base, and fixedly connected to the inner shell base; the dial is provided with scale lines.

10. An anesthesia machine, characterized in that: The APL valve comprises any one of claims 1-9.

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