An APL valve and an anesthesia machine

Abstract

The application relates to the technical field of medical devices, in particular to an APL valve and an anesthesia machine. The APL valve comprises a valve shell, a valve inner shell assembly, a valve base assembly and a valve heightening seat assembly, the valve base assembly and the valve heightening seat assembly are fixedly connected to form a base of the APL valve; the valve shell has a cylindrical knob part and a scale mark part extending in an umbrella shape at the bottom end of the knob part; the valve inner shell assembly is located in the valve shell and comprises an inner shell, an inner shell base assembly and an inner shell function assembly; the inner shell is fixedly connected with the valve shell and moves with the valve shell; the inner shell base assembly is located in the inner shell and is detachably connected with the valve base assembly; the inner shell function assembly is located in the inner shell base assembly and axially moves relative to the inner shell base assembly driven by the valve shell and the inner shell to adjust the opening pressure of the APL valve. The APL valve and the anesthesia machine provided by the application have the advantages of miniaturization, accurate adjustment, quick disassembly and assembly, pressure relief protection and user friendliness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an APL valve and an anesthesia machine. BACKGROUND

[0002] An anesthesia breathing circuit is a circuit formed by connecting the gas output port of an anesthesia machine with the respiratory tract of a user.

[0003] The common ventilation modes of the anesthesia breathing circuit are manual ventilation and mechanical ventilation mode. The APL (adjustable pressure limiting) valve plays a crucial role, and its core function is to control the gas pressure in the manually driven gas branch of the anesthesia machine, which is a kind of 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 piece assembly is closed under the elastic force generated by the elastic element. Once the pressure of the air inlet exceeds the elastic force of the elastic element set by the user, the gas will push away the valve piece assembly and release through the air outlet to adjust and stabilize the gas pressure.

[0005] However, the APL valve also faces technical challenges in actual operation. After the user sets the elastic force of the elastic element, the gas can only recover to the elastic force set by the user during the release process, but when the user sets a high value, the pressure of the APL valve cannot be quickly adjusted to atmospheric pressure in an emergency. Furthermore, due to the protruding height of the APL valve, the user needs to disassemble the APL valve from the circuit assembly when disinfecting and sterilizing the APL.

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

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

[0008] To solve the above technical problems, the technical scheme of the present application provides an APL valve, which comprises a valve housing, a valve inner housing 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 housing has a cylindrical knob portion, and a scale mark portion extending in an umbrella shape at the bottom end of the knob portion;

[0011] The valve inner housing assembly is located inside the valve housing and comprises an inner housing, an inner housing base assembly and an inner housing functional assembly; wherein,

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

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

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

[0015] As an improvement of the above-mentioned APL valve, the inner shell base assembly comprises an inner shell base and a guide column; the inner shell base is located inside the inner shell and is detachably connected with the valve base assembly; the guide column is fixedly arranged on the inner wall of the inner shell base; the inner shell functional assembly comprises a valve core rod, a valve core, a guide nut and a pressure spring; the upper end of the valve core rod is fixedly connected with the valve shell, and the lower end is connected with the valve core; the guide nut is sleeved on the valve core rod, is in sliding connection with the valve core rod in the axial direction, and is driven to rotate by the valve core rod in the circumferential direction; a sliding groove cooperates with the guide column to enable the guide nut to move axially along the inner shell base assembly when rotating; the valve shell drives the valve core rod to rotate and further 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; the pre-tightening force provided by the pressure spring for the valve core is adjusted by adjusting the axial position of the guide nut; the valve core is lifted to release pressure when the internal pressure of the circuit is greater than the pre-tightening force provided by the pressure spring, and is reset after the pressure decreases.

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

[0017] As an improvement of the above-mentioned APL valve, the inner shell functional assembly further comprises a lifting spring; 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 shell is lifted axially by external force, the valve core rod and the valve core are lifted upward, the APL valve is rapidly depressurized, and then the internal pressure of the circuit is instantaneously released to the atmospheric pressure; after depressurization, the external force is removed, the valve core rod is axially moved by the elastic force of the lifting spring, the valve core is reset, and thus the APL valve restores the original set opening pressure.

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

[0019] As an improvement of the APL valve, 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 damping feeling when the valve shell is rotated.

[0020] As an improvement of the APL valve, the valve inner shell assembly further comprises: a valve inner shell hand feeling assembly; wherein the valve inner shell hand feeling assembly comprises: a hand feeling spring, a support column and a support column baffle; the inner shell bottom edge is provided with an assembly hole, the hand feeling spring is located in the assembly hole, the first end of the support column extends into the hand feeling spring, and the second end abuts against the support column baffle; the support column baffle is fixedly connected with the inner shell; the second end of the support column is further provided with a semicircular protrusion extending out of the support column baffle; the support column is driven by the inner shell to rotate circumferentially; the inner shell base is provided with a plurality of support column grooves on the circumferential rotation of the support column; when the valve shell drives the support column to rotate through the inner shell, the support column strikes the support column grooves of the inner shell base to provide sound feedback in the process of adjusting pressure.

[0021] As an improvement of the APL valve, the inner shell base and the valve base assembly are detachably connected through a fastening nut cover and a guide pin shaft; wherein the bottom of the inner shell base is provided with a positioning hole in 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 in 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; the outer wall close to the bottom of the inner shell base is provided with a flange, the fastening nut cover is threadedly connected with the valve base assembly, and the inner shell base and the valve base assembly are axially fixed by extruding the flange of the outer wall of the inner shell base.

[0022] As an improvement of the APL valve, the inner shell base and the valve base assembly are detachably connected through a fastening nut cover and a guide pin shaft; wherein the bottom of the inner shell base is provided with a positioning hole in 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 in 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; the outer wall close to the bottom of the inner shell base is provided with a flange, the fastening nut cover is threadedly connected with the valve base assembly, and the inner shell base and the valve base assembly are axially fixed by extruding the flange of the outer wall of the inner shell base.

[0023] To achieve another object of the present application, the present application also provides an anesthesia machine comprising the APL valve.

[0024] Compared with the prior art, the APL valve and the anesthesia machine comprising the same have the advantages of miniaturization, precise adjustment, quick disassembly and assembly, pressure relief protection and user friendliness. The valve housing and the inner housing are composed of a cylindrical part and an umbrella part, the guide nut is arranged inside the inner housing base and located at the corresponding position of the cylindrical part, so that the APL valve is more compact and smaller in size; the inner housing assembly and the valve housing are tightly matched, the rotating housing can adjust the pressure of the valve core to realize precise control; the quick disassembly design facilitates maintenance and cleaning and prolongs the service life; the instantaneous pressure relief function can quickly reduce the circuit pressure in an emergency to improve safety; the touch gasket and the sound feedback design make the operation more intuitive and avoid misoperation. In addition, the pressure scale disc clearly displays the set pressure to enhance the visual adjustment experience. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The overall structure schematic diagram of the APL valve provided by the embodiment of the present application is shown in the figure.

[0026] Figure 2 The cross-sectional view along the A-A tangent line. Figure 1

[0027] Figure 3 The exploded view of the APL valve.

[0028] Figure 4 The installation schematic diagram of the touch gasket 8241.

[0029] Figure 5 The installation schematic diagram of the support column 8223.

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

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

[0032] Figure 8 The installation schematic diagram of the inner housing base 8243 and the scale disc 827.

[0033] Figure 9 The position relationship diagram of the valve housing 81 and the valve heightening seat assembly 84.

[0034] Figure 10 The schematic diagram of the APL valve and the anesthesia machine after installation. DETAILED DESCRIPTION

[0035] The technical solutions provided by the present application are further illustrated below in combination with the embodiments.

[0036] Embodiment 1

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

[0038] The APL valve provided in this embodiment is mainly divided into six parts, such as Figures 1-3 As shown, it includes: valve housing 81, valve inner housing assembly 82, valve base assembly 83, valve riser assembly 84, first fastening screw 85, and second fastening screw 86.

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

[0040] The valve inner housing assembly 82 is disposed inside the valve outer housing 81. The valve outer housing 81 has a cylindrical knob portion and a scale marking portion extending in an umbrella shape from the bottom end of the knob portion. Figure 7 As shown, a male housing buckle 81a is provided on the inner side of the scale marking section, as... Figure 1 and Figure 3 As shown, a pressure scale dial 81b is provided on the outer side.

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

[0042] The valve inner housing tactile assembly includes: an inner housing 8221, a tactile spring 8222, a support post 8223, a support post baffle 8224, and a fourth fastening screw 8225. For example... Figures 2-3 As shown, the inner shell 8221 has a shape that fits inside the valve outer shell 81, including a cylindrical portion and a umbel portion. As... Figure 7 As shown, the outer side of the inner shell umbrella portion of the inner shell 8221 is provided with an inner shell female buckle 8221a that matches the outer shell male buckle 81a. After the outer shell male buckle 81a and the inner shell female buckle 8221a are engaged, the inner shell 8221 is fixedly connected to the valve shell 81 and moves with the valve shell 81.

[0043] like Figure 5As shown, the bottom edge of the inner shell umbrella of the inner shell 8221 is provided with an assembly hole, and a hand spring 8222 is placed in the assembly hole. The hand 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 is in contact with a support column stop plate 8224. The support column stop plate 8224 is detachably connected with the inner shell 8221 through a fourth fastening screw 8225, so as to press the support column 8223 between the support column stop plate 8224 and the top end of the assembly hole of the inner shell 8221, and make the support column 8223 rotate with the inner shell 8221. The support column 8223 is also provided with a semicircular protrusion penetrating through the support column stop plate 8224. During assembly, the hand spring 8222 and the support column 8223 are first assembled into the assembly hole of the inner shell 8221, then the support column stop plate 8224 is used to press the support column 8223, and finally the fourth fastening screw 8225 is used for fixation. After such assembly, the hand feeling assembly of the valve inner shell forms an integral whole. The adapter disc 826 is located at the top inside of the inner shell 8221, and is fixedly connected with the inner shell 8221 through the first fastening screw 85.

[0044] As shown in Figures 2-3 , the inner shell base assembly includes a hand feeling washer 8241, a guide column 8242, an inner shell base 8243, a first sealing ring 8244, and a guide pin shaft 8245.

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

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

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

[0048] like Figure 6 As shown, the inner shell base 8243 has several support column grooves 8243a on the rotation circumference of the support column 8223. When the valve shell 81 drives the support column 8223 to rotate through the inner shell 8221, the support column 8223 strikes the support column grooves 8243a of the inner shell base 8243 to provide audible feedback during the pressure adjustment process.

[0049] like Figures 2-3 As shown, the dial 827 is located below the valve housing 81, fitted around the inner housing base 8243, and fixedly connected to the inner housing base 8243. The dial 827 is provided with scale lines 827a. Specifically, as shown... Figure 8 As shown, the dial 827 includes a scale line 827a, a limiting protrusion 827b, and a limiting block guide groove 827c. The inner shell base 8243 includes a support column groove 8243a, a scale line orientation block 8243b, a protrusion limiting groove 8243c, and a limiting block 8243d. The assembly relationship between the dial 827 and the inner shell base 8243 is as follows: the scale line 827a and the scale line orientation block 8243b are in the same direction, and the limiting block guide groove 827c and the limiting block 8243d restrict the radial and circumferential positions of the dial 827 and the inner shell base 8243. The limiting protrusion 827b and the protrusion limiting groove 8243c restrict the axial position of the dial 827 and the inner shell base 8243, so that the dial 827 is fixed on the inner shell base 8243.

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

[0051] like Figures 2-3As shown, the guide nut 8233 is located inside the inner shell base 8243. The groove 8233a of the guide nut 8233 matches the guide post 8242, so that when the guide nut 8233 rotates, it moves up and down along the axial direction of the inner shell base 8243.

[0052] like Figures 2-3 As shown, the top end of the valve core rod 8232 passes upward through the guide 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 guide 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 guide nut 8233 to rotate, and the valve core rod 8232 and the guide nut 8233 are slidably connected in the axial direction. The valve core rod 8232 located on the upper side of the guide nut 8233 is provided with a flange. The lifting spring 8231 is sleeved on the valve core rod 8232 located on the upper side of the guide nut 8233, with its upper end abutting against the inner housing base 8243 and its lower end abutting against the flange of the valve core rod 8232. A pressure spring 8235 is fitted onto the valve core rod 8232 located below the guide nut 8233, with its upper end abutting against the guide nut 8233 and its lower end abutting against the valve core 8239. A second damping washer 8238 may also be provided between the lower end of the pressure spring 8235 and the valve core 8239. A first damping washer 8234 may also be provided between the upper end of the pressure spring 8235 and the guide nut 8233.

[0053] After the inner housing assembly 82 is assembled, it is fixed to the valve housing 81. The valve base assembly 83 and the valve riser assembly 84 are fixedly connected by the first fastening screw 85, together forming the base of the APL valve. The valve riser assembly 84 is then inserted into... Figure 10 In the circuit assembly 10 of the anesthesia machine shown, the valve inner shell assembly 82 inside the valve housing 81 is then fixed with the second fastening screw 86, and the valve inner shell assembly 82 inside the valve housing 81 is inserted into the valve base assembly 83 via the guide post 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 riser assembly 84 on the circuit assembly 10, and the rest of the valve can be another whole, which is convenient for staff to clean and disinfect.

[0054] When the support column 8223 slides on the inner shell base 8243 through the action of the hand-feel spring 8222, the inner shell base 8243 is provided with a support column groove 8243a, which allows the support column 8223 to move repeatedly on the support column groove 8243a and the flat surface, increasing the turning click sound. In addition, the damping effect of the hand-feel washer 8241 makes the mechanical APL valve have a damping feel when rotating, which conforms to the ergonomic design.

[0055] Valve core 8239 due to the elastic force of pressure spring 8235, so that the valve core 8239 and valve seat assembly 83 seal, when the loop inside the pressure P1 and the force F1 of the valve core 8239 sealing surface ≥ pressure spring 8235 generated spring force F2, the valve core 8239 lift pressure relief, so that the loop inside the pressure P1 drops rapidly, until equal to the spring force F2, the valve core 8239 reset continues to seal with the valve seat assembly 83.

[0056] Valve housing 81 shell male buckle 81a and 8221a inner shell female buckle lock when the need to make the loop inside the pressure P1 to atmospheric pressure, you can quickly relieve by pulling up the valve housing 81, further drive the valve inner shell assembly 82 lift, further drive the valve core 8239 away from the valve seat assembly 83, after the hand, the valve inner shell assembly 82 through the lift spring 8231 reset.

[0057] Installation method

[0058] Valve inner shell hand feel assembly: first assembled into the inner shell 8221 assembly hole, then use the support column baffle 8224 to press the support column 8223, finally use the fastening screw;

[0059] Inner shell functional assembly: first put the shock pad 8238 into the valve core 8239, then in turn from the valve core rod 8232 below the guide nut 8233, washer 8234, pressure spring 8235, then the valve core 8239 extruded pressure spring 8235 after inserting into the valve core rod 8232 hole, then put the valve core lock nut 8236 from the valve core rod 8232 top, the valve core lock nut 8236 and valve core 8239 fixed, then the tight screw 8237 from the valve core lock nut 8236 top into, finally the lift spring 8232 into the valve core rod 8232 top;

[0060] Inner shell base assembly: assembled in turn in the inner shell base 8243 sealing ring groove, the guide pin shaft 8245 inserted into the inner shell base 8243 threaded hole, the guide column 8242 has been pressed into the inner shell base 8243 in machining;

[0061] Inner shell assembly 82: first assembled into the inner shell base assembly, then the adapter disc 826 into the inner shell base assembly, then use the first tight screw 825 to fix the adapter disc 826 and inner shell functional assembly, then in turn from the inner shell base assembly upper fastening nut cover 828, dial 827, then the inner shell base assembly from the lower end into the valve inner shell hand feel assembly, finally use the third fastening screw 821 fixed;

[0062] Mechanical APL valve assembly with circuit assembly 10: when assembling, first, valve booster seat assembly 84 is assembled into circuit assembly 10, then fixed with second fastening screw 86, then valve base assembly 83 is assembled into valve booster seat assembly 84 through guide pin shaft 8245, and fixed with first fastening screw 85, then inner shell assembly 82 is assembled into valve base assembly 83, and fixed with fastening nut cover 828, finally, valve outer shell 81 is inserted from above inner shell assembly 82, and fixed through outer shell male buckle 81a and inner shell female buckle 8221a.

[0063] Application mode

[0064] a. Function of specific pressure relief: by rotating valve outer shell 81, on one hand, pressure scale dial face 81b (not given in detail) corresponds to scale line 827a, so as to give a rated pressure; on the other hand, inner shell base 8243 of inner shell base assembly is fixed with valve base assembly 83, and the sliding groove 8233a of guide nut 8233 can rotate around guide column 8242 with the rotation of valve outer shell 81, so as to make guide nut 8233 rise or fall, so as to release or extrude pressure spring 8235, and further extrude or release valve core 8239, so as to reduce or increase the opening pressure of valve core 8239 and valve base assembly 83.

[0065] b. Lifting function: by pulling up valve outer shell 81, inner shell assembly 82 and valve core rod 8232 are lifted, valve core rod 8232 extrudes lifting spring 8231 and drives valve core 8239 to rise, so as to achieve pressure relief function by moving away from valve base assembly 83; after releasing valve outer shell 81, lifting spring 8231 is reset.

[0066] c. Quick release function: as shown in Figure 9 , by screwing fastening nut cover 828, the upper part and the lower part of mechanical APL valve can be separated, valve booster seat assembly 84 and valve base assembly 83 are left on circuit assembly 10, and valve outer shell 81 and other components are taken down as a whole, so as to facilitate the cleaning and disinfection of mechanical APL valve.

[0067] Embodiment 2

[0068] The embodiment provides an anesthesia machine comprising the APL valve provided in embodiment 1.

[0069] The present application has the following advantages:

[0070] The APL valve and the anesthesia machine comprising the same provided by the embodiment are characterized in that the APL valve is designed with a valve cover which can be quickly depressurized to atmospheric pressure and restored to the set value by releasing the hand, thereby simplifying the user operation.

[0071] The APL valve provided by the present application is provided with a screw touch function, which can make the user operation simple and meet the ergonomics; a screw touch point function is provided, which increases the sound feedback in the process of setting the pressure by the user; an opening pressure function is provided, which enables the user to quickly set at the commonly used pressure setting value; a lifting quick pressure relief function is provided, which enables the user to instantly return the airway pressure to atmospheric pressure at any opening pressure setting value and restore the set opening pressure value when reset.

[0072] The lifting quick pressure relief function can compensate for the deficiencies of the traditional mechanical APL valve which cannot realize the function of quick pressure relief and may increase the risk of emergencies.

[0073] The quick disassembly function for disinfection can solve the problem that the fixing mode of the mechanical APL valve and the circuit assembly in the traditional design is a screw fastening mode, and the mechanical APL valve needs to be disassembled from the circuit assembly by using a tool during disinfection, thereby increasing the inconvenience of medical personnel.

[0074] The small size feature is that the valve shell 81 and the inner shell 8221 of the APL valve provided by the present application are both composed of a cylindrical part and an umbrella part, the guide nut 8233 is arranged inside the inner shell base 8243 and located at the corresponding position of the cylindrical part, so that the APL valve is more compact and small in size.

[0075] The device structure of the present application is original, and the improved design significantly improves the practicality, safety and maintenance convenience of the breathing circuit module, so that it is more suitable for the strict requirements of the medical environment. Any application of the idea of the present application is within the protection scope of the present application.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. An APL valve comprising: The valve housing, valve inner housing assembly, valve base assembly and valve riser assembly, wherein, The valve base assembly and valve riser assembly are fixedly connected to form the base of the APL valve; The valve housing has a cylindrical knob part, and a scale mark part extending in the shape of an umbrella at the bottom end of the knob part; The valve inner housing assembly is located inside the valve housing and comprises an inner housing, an inner housing base assembly and an inner housing functional assembly; wherein, The inner housing is fixedly connected with the valve housing and moves with the valve housing; The inner housing base assembly is located inside the inner housing and is detachably connected with the valve base assembly; The inner housing functional assembly is located inside the inner housing base assembly and moves axially relative to the inner housing base assembly under the drive of the valve housing and the inner housing to adjust the opening pressure of the APL valve; The inner housing base assembly comprises an inner housing base and a guide column; wherein, The inner housing base is located inside the inner housing and is detachably connected with the valve base assembly; the guide column is fixedly arranged on the inner wall of the inner housing base; The inner housing functional assembly comprises 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 with the valve housing, and the lower end is connected with 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 rotatably driven by the valve core rod in the circumferential direction; The sliding groove cooperates with the guide column to enable the guide nut to move axially along the inner housing base assembly when rotating; wherein, the valve housing drives the valve core rod to rotate and further 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; 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 is lifted to release pressure when the pressure inside the loop is greater than the pre-tightening force provided by the pressure spring, and is reset after the pressure decreases; The inner housing functional assembly further comprises 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 housing base, and the other end abuts against the flange of the valve core rod; when the valve housing is lifted axially by external force, the valve core rod and the valve core are lifted upward, the APL valve is rapidly depressurized, and the pressure inside the loop is instantaneously released to atmospheric pressure; after depressurization, the external force is removed, the valve core rod is axially moved by the elastic force of the lifting spring, the valve core is reset, and the APL valve returns to the original set opening pressure; The inner side of the scale mark part of the valve housing is provided with a housing male buckle, and the outer side is provided with a pressure scale disc surface; the outer side of the inner housing is provided with an inner housing female buckle matched with the housing male buckle at the corresponding position of the housing male buckle; after the housing male buckle and the inner housing female buckle are clamped, the inner housing is fixedly connected with the valve housing and moves with the valve housing; the APL valve further comprises a scale disc, wherein, the scale disc is located below the valve housing, is sleeved on the outer side of the inner housing base and is fixedly connected with the inner housing base; the scale disc is provided with scale lines.

2. The APL valve of claim 1, wherein The guide nut is located at the corresponding position of the knob part of the valve housing.

3. The APL valve of claim 1, wherein, A first shock-absorbing washer is arranged between the pressure spring and the guide nut, and a second shock-absorbing washer can be arranged between the pressure spring and the valve core.

4. The APL valve of claim 1, wherein The inner housing base assembly further comprises a hand feeling washer, an outer wall of the inner housing base is provided with a hand feeling washer sealing groove, and the hand feeling washer is installed in the sealing groove to provide damping feeling when the valve housing is rotated.

5. The APL valve of claim 1, wherein The valve inner housing assembly further comprises a valve inner housing hand feeling assembly; wherein, The valve inner housing hand feeling assembly comprises a hand feeling spring, a support column and a support column stop plate; The inner housing bottom edge is provided with an assembly hole, the hand feeling spring is located in the assembly hole, a first end of the support column extends into the hand feeling spring, and a second end abuts against the support column stop plate; the support column stop plate is fixedly connected with the inner housing; The second end of the support column is further provided with a semicircular protrusion extending out of the support column stop plate; the support column is driven by the inner housing to rotate circumferentially; The inner housing base is provided with a plurality of support column grooves on a rotating circumference of the support column; when the valve housing drives the support column to rotate by the inner housing, the support column strikes the support column grooves of the inner housing base to provide sound feedback in the pressure adjustment process.

6. The APL valve of claim 1, wherein, The inner housing base and the valve base assembly are detachably connected through a fastening nut cover and a guide pin shaft; wherein, The inner housing base bottom is provided with a positioning hole in an axial direction of the inner housing base, one end of the guide pin shaft is inserted into the positioning hole of the inner housing base in the axial direction of the inner housing base, and the other end is inserted into the valve base assembly to realize circumferential fixation of the inner housing base and the valve base assembly; an outer wall close to the bottom of the inner housing base is provided with a flange, the fastening nut cover is threadedly connected with the valve base assembly, and the inner housing base and the valve base assembly are fixed by extruding the flange of the outer wall of the inner housing base.

7. An anaesthesia machine characterised in that, The APL valve comprises any one of claims 1-6.

Images