A direct-acting medical demand valve

Abstract

The present invention discloses a direct-acting medical demand valve, which includes a valve body, a valve core assembly disposed within the valve body, an upper valve cover assembly coupled to the upper portion of the valve body, and a lower valve cover assembly coupled to the lower portion of the valve body. The valve core assembly includes a lever drive assembly and a pressure-regulating spring assembly. This solution utilizes a lever drive assembly and a pressure-regulating spring assembly disposed within the valve body to generate a slight pressure change at the valve outlet to sense the patient's needs for gas delivery and gas cut-off. The pressure-regulating spring assembly can also adjust the valve's opening force, allowing gas delivery according to the patient's needs. A spring button is disposed within the valve cover assembly to cooperate with the lever drive assembly. When the patient is not breathing spontaneously, the button can be forcibly pressed to deliver gas, thereby improving the patient's survival rate.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a direct-acting medical demand valve. Background Art

[0002] As a pressure-reducing device for gas storage and use, gas pressure reducing valves are increasingly being used across a wide range of applications. Besides conventional compressed gas supply, they are also used in gas control and specialized applications. In medical oxygen therapy, a gas pressure reducing valve is typically used to reduce the gas pressure to the required level, with a flow meter then setting the desired flow rate for open-circuit oxygen inhalation. However, in specialized applications, such as field or battlefield emergency response, it is crucial to efficiently utilize the oxygen carried to prolong the oxygen supply time for patients and the injured while awaiting rescue.

[0003] Unlike conventional methods, patients receive oxygen through a closed breathing mask. After decompression, the oxygen supply is not set by a flow meter. Instead, the demand valve at the back controls the oxygen supply based on demand. For patients with spontaneous breathing, when they inhale, the demand valve senses the inhalation and automatically opens to supply air. When the patient stops inhaling or exhaling, the demand valve automatically closes, conserving the air supply. Furthermore, for patients without spontaneous breathing, manual artificial respiration can be performed until the patient resumes spontaneous breathing. This significantly reduces the workload of medical staff and improves patient survival rates.

[0004] As mentioned above, medical demand valves operate by sensing the patient's inhalation, i.e., the slight pressure change generated at the valve outlet. In actual use, for safety reasons, the gas source pressure is relatively low, but patients and injured individuals often require high gas volumes. Conventional pressure-reducing valve structures cannot meet these requirements. Therefore, existing demand valves are designed as pilot-operated pressure-reducing valves, utilizing a small pilot valve to control the main valve to achieve the required high output flow.

[0005] See also Figure 1 , which shows the existing pilot valve structure. It can be seen from the figure that the existing pilot valve structure includes a valve cover 10, a button spring 11, a diaphragm 12 and other components placed in the valve cover assembly, and the throttle hole 10 is located in the valve body.

[0006] When using a pilot valve, the main valve's opening and closing are controlled by the pressure differential created by the pilot valve opening. This pressure differential is in turn controlled by the pilot valve's diameter and the size and ratio of the throttle aperture. Due to intake pressure limitations, the pilot valve's diameter should be minimized to improve pressure stability. However, due to manufacturing process limitations, the throttle aperture cannot be made smaller.

[0007] On the other hand, as mentioned above, the negative pressure generated by the patient is quite weak, and the pressure differential across the main valve disc cannot be too large. Therefore, the demand valve main valve can only be sealed with a soft rubber diaphragm to accommodate the smaller disc force. However, due to the influence of rubber hardness, operating temperature, dimensional accuracy, and valve seat assembly accuracy, the actual main valve opening varies greatly. Adjustments are required during the assembly process to control the sealing force of the main valve. If the main valve sealing force is too strong, the smaller disc operating force cannot open the main valve disc or the main valve disc cannot open fully, and the main valve will not function properly. If the main valve sealing force is too weak, the main valve seal is poor and direct leakage may occur.

[0008] It can be seen from this that for the demand valve, the pilot valve structure has new problems such as weak pressure and difficult to control the operating force. It is very difficult to control the sealing force of the main valve during assembly and debugging, resulting in low production efficiency and high cost. Summary of the Invention

[0009] In order to solve the problems existing in the existing medical demand valve adopting the pilot valve structure, a new medical demand valve solution is needed.

[0010] To this end, the purpose of the present invention is to provide a direct-acting medical demand valve, which can achieve adjustable valve opening force and solve the problems of too small valve operating force and difficult debugging.

[0011] In order to achieve the above-mentioned objectives, the present invention provides a direct-acting medical demand valve, which includes a valve body, a valve core assembly arranged in the valve body, an upper valve cover assembly cooperated with the upper part of the valve body, a lower valve cover assembly cooperated with the lower part of the valve body, a two-stage series lever arranged in the valve body, a diaphragm arranged in the valve body, and a pressure-regulating spring assembly arranged in the valve body, the upper valve cover assembly is arranged at the upper end of the valve body, the diaphragm seal is arranged between the upper valve cover assembly and the upper end of the valve body, and contacts and cooperates with the upper valve cover assembly; the valve core assembly is arranged in the valve body through the pressure-regulating spring assembly, and contacts and cooperates with the diaphragm through the two-stage series lever, and the two-stage series lever amplifies the air pressure sensed by the diaphragm to operate the opening and closing of the valve; the lower valve cover assembly is arranged at the lower end of the valve body and cooperates with the valve core assembly.

[0012] Furthermore, the diaphragm is a corrugated rubber flexible diaphragm with a metal disc attached to the center of the lower part.

[0013] Furthermore, the two-stage series lever includes a primary lever and a secondary lever, and the power point at the tail of the secondary lever cooperates with the middle of the primary lever to serve as the resistance point of the primary lever.

[0014] Furthermore, the head of the secondary lever has a hinge hole as a fulcrum, the end is a power point, and the middle screw hole on the fulcrum side is a resistance point.

[0015] Furthermore, an adjusting top screw is provided on the secondary lever, and serves as a resistance point of the secondary lever to cooperate with the top of the valve guide rod in the valve core assembly.

[0016] Furthermore, the head of the first-level lever has a hinge hole as a fulcrum, the end is a power point, and the middle side close to the fulcrum is a resistance point.

[0017] Furthermore, the valve cover assembly mainly includes a center cap, a movable sleeve, a safety spring, a button, a screw cover, a reset spring and a valve cover. The safety spring is placed in the central concave cavity of the center cap, the center cap is placed in the movable sleeve, the button is in the shape of a round cover, the upper edge portion is covered and arranged above the movable sleeve, the lower central concave cavity is fitted with the safety spring, the safety spring is screwed into the movable sleeve by the button in a threaded manner, the reset spring is placed in the annular cavity below the movable sleeve, and then the movable sleeve is placed in the screw cover, and is screwed into the central cavity of the valve cover by the upper button in a threaded manner.

[0018] Furthermore, the valve lower cover assembly mainly includes a valve lower cover, a breathing valve flap, an inhalation valve and a valve screw; the valve screw penetrates the inhalation valve and is screwed into the central screw hole of the exhalation valve flap in a threaded manner to fix the inhalation valve; and the exhalation valve flap is then placed in the concave cavity in the valve lower cover.

[0019] Furthermore, the valve core assembly mainly includes a valve stem, a valve seat seal, a valve seat and a valve guide rod. The valve seat seal is embedded in the lower inner cavity of the valve seat; the valve guide rod is placed in the central circular hole of the valve seat, and the lower part of the valve guide rod cooperates with the upper end of the valve stem to squeeze each other and transmit lever power. The non-circular valve guide rod cooperates with the central circular hole of the valve seat to form an air duct.

[0020] Furthermore, the pressure regulating spring assembly includes a locking nut, an adjusting piston, a sealing ring, a spring washer and a valve stem spring; the sealing ring and the spring washer are placed in the adjusting piston, and the adjusting piston is fixed by a locking nut, which cooperates with the valve stem spring.

[0021] The direct-acting medical demand valve provided by the present invention adopts a lever to amplify the weak outlet pressure signal, directly operates the valve opening, and can adjust the valve opening force, which can solve the problem of too small operating force and difficult debugging of the existing valve, and realize the function of the demand valve.

[0022] At the same time, the direct-acting medical demand valve can also eliminate the force exerted on the valve core by changes in intake pressure, thereby ensuring sufficient output flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 This is a schematic diagram of the pilot-operated demand valve structure;

[0025] Figure 2 Schematic cross-sectional view of a direct-acting medical demand valve in an example of the present invention;

[0026] Figure 3 Schematic diagram of an explosion of a direct-acting medical demand valve in an example of the present invention;

[0027] Figure 4 Schematic diagram of the inhalation working process of the direct-acting medical demand valve in an example of the present invention;

[0028] Figure 5 This is a schematic diagram of the exhalation workflow of a direct-acting medical demand valve in an example of the present invention;

[0029] Figure 6 This is a schematic diagram of the artificial air supply process of a direct-acting medical demand valve in an example of the present invention;

[0030] Figure 7 This is a schematic diagram of the working process of stopping artificial air supply by a direct-acting medical demand valve in an example of the present invention;

[0031] Figure 8 This is a schematic diagram of the artificial air supply protection workflow of a direct-acting medical demand valve in an example of the present invention; DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0033] See also Figure 2 and Figure 3 , which shows a cross-sectional schematic diagram and component exploded diagram of the direct-acting medical demand valve of the present invention.

[0034] As can be seen from the figure, the present invention consists of a valve body 400, a valve upper cover assembly 100, a valve core assembly 200 and a valve lower cover assembly 300. The valve core assembly 200 built into the valve body 400 cooperates with the valve body 400 to connect the valve upper cover assembly 100 at the top and the valve lower cover assembly 300 at the bottom.

[0035] The valve body 400 constitutes the entire demand valve body, and is used to carry the valve upper cover assembly 100 , the valve core assembly 200 and the valve lower cover assembly 300 .

[0036] The overall shape is cylindrical. The upper end of the valve body 400 is annular with a connecting thread on the outside, and a concave cavity inside. There is a small concave cavity in the center of the bottom surface of the concave cavity, and screw holes are set in the lower concave cavity and the bottom surface of the small concave cavity. The lower end of the small concave cavity is small in the middle and large at both ends. The center is a revolving cavity, and the large end on the outside of the revolving cavity has an internal thread. The side of the valve body 400 is an air inlet, and an inclined hole is set at the bottom of the air inlet to connect with the middle of the central revolving cavity. The lower end of the valve body 400 is also annular with a connecting thread on the outside, and a concave cavity inside. A ring protrudes in the center of the concave cavity, and the outer edge of the ring is threaded. A straight hole is set on the edge of the concave cavity on the valve body to connect with the concave cavity below the valve body.

[0037] The valve cover assembly 100 in this example is mainly composed of a center cap 106, a movable sleeve 103, a safety spring 107, a button 105, a screw cover 102, a return spring 104 and a valve cover 101, wherein the center cap 106, the movable sleeve 103, the safety spring 107, the button 105, the screw cover 102, and the return spring 104 are mutually cooperated and built into the valve cover 101.

[0038] The valve cover 101 is in the shape of a dome as a whole, with a concave cavity in the center, an internal connecting thread at the bottom, a ring in the center, an internal connecting thread at the top of the ring, and a side hole leading to the outside.

[0039] The screw cap 102 is annular as a whole, has an edge on the upper part, external threads, and internal steps.

[0040] The movable sleeve 103 is annular as a whole, with an annular concave cavity at the bottom and an internal thread at the top.

[0041] The return spring 104 is a cylindrical coil spring.

[0042] The button 105 is in the shape of a dome as a whole, with an edge on the upper part, a central concave cavity on the lower part, and external threads.

[0043] The center cap 106 is generally cup-shaped, with a rim at the top and a concave cavity in the center.

[0044] The safety spring 107 is a cylindrical coil spring.

[0045] In this way, the safety spring 107 in the valve upper cover assembly 100 is placed in the central concave cavity of the center cap 106, the center cap 106 is placed in the movable sleeve 103, the button 105 is a round cover, the upper edge part is covered and arranged above the movable sleeve 103, the lower central concave cavity is fitted with the safety spring 107, the safety spring 107 is screwed into the movable sleeve 103 by the button 105 in a threaded manner, the reset spring 107 is placed in the lower annular cavity of the movable sleeve 103, and then the movable sleeve 103 is placed in the screw cover 102, and the upper button 105 is screwed into the central cavity of the valve upper cover 101 in a threaded manner. The above structure constitutes the upper cover assembly 100.

[0046] The valve core assembly 200 in this example is mainly composed of a valve stem 202, a valve seat seal 203, a valve seat 204, a valve guide rod 205, a diaphragm 206, a diaphragm pressure plate 207, a locking nut 208, an adjusting piston 209, a sealing ring 210, a sealing ring 211, a spring washer 212, a valve stem spring 213, a round seat plate 214, an adjusting top screw 215, a long pin shaft 216, a secondary lever 217, a square seat plate 218, a short pin shaft 219, a screw 220, and a primary lever 221, which cooperate with each other.

[0047] The valve stem 202 is a multi-step rod-shaped rotating body with cylindrical upper and lower ends. The upper middle portion is a conical sealing surface, and the middle and lower middle portions are multi-step cylinders. The diameter of the lower end cylinder is consistent with the orifice of the valve sealing seat 203.

[0048] The valve seat seal 203 adopts an annular sealing gasket, and the inner hole is the valve port, which is the same size as the diameter of the lower end of the valve stem 202.

[0049] The valve seat 204 is in the shape of a screw with a central circular hole, a slot on the upper portion and an annular cavity on the lower portion.

[0050] The valve guide rod 205 is a columnar body with a convex head at the bottom, and the columnar side surface is an irregular circle with a guide.

[0051] The diaphragm 206 is a corrugated rubber flexible membrane with a metal disc attached to the center of its lower portion to increase rigidity.

[0052] The diaphragm pressure plate 207 is preferably an annular thin sheet.

[0053] The locking nut 208 is preferably a nut with a through hole.

[0054] The regulating piston 209 is a hollow piston with a lower regulating thread, a double-step hole in the center, an outer circle piston with an annular groove on the upper part, an regulating thread on the lower part, and an operating hole for regulating on the lower end surface.

[0055] The sealing rings 210 and 211 are preferably O-shaped rubber sealing rings, but are not limited thereto and other shapes of sealing rings may also be used.

[0056] The spring washer 212 is preferably an annular washer.

[0057] The valve stem spring 213 adopts a cylindrical spring of corresponding specifications.

[0058] The round seat plate 214 is preferably a disc-shaped plate with a mounting hole, a center through slot, and a small sink.

[0059] The hinge hole at the head of the secondary lever 217 is a fulcrum, a power point at the end, and a screw hole in the middle close to the fulcrum is a resistance point.

[0060] Square seat plate 218 is a square plate with rounded corners, mounting holes and small sinks.

[0061] The screws 220 are used to fix the round seat plate 214 and the square seat plate 218 .

[0062] The first-level lever 221 has a hinge hole at its head as a fulcrum, a power point at the end, and a resistance point in the middle near the fulcrum.

[0063] The valve seat seal 203 in this assembly is embedded in the annular cavity below the valve seat 204 and screwed into the threads at the upper end of the rotating cavity in the center of the valve body 400. The valve guide rod 205 is inserted into the central hole of the valve seat 204. Its lower portion engages with the upper end of the valve stem 202 to transmit lever force. An air passage is formed between the non-circular valve guide rod 205 and the central circular hole of the valve seat 204.

[0064] The diaphragm 206 is a corrugated flexible rubber sheet with a large deformation amount. It is placed on the upper annular opening of the valve body 400. The diaphragm pressure plate 207 is placed on the diaphragm 206. The valve upper cover assembly 100 connects the diaphragm pressure plate 207 through a threaded connection. The diaphragm 206 and the valve body 400 are tightened and sealed. The diaphragm pressure plate 207 is used to prevent the diaphragm 206 from being twisted during the tightening process.

[0065] Secondly, the diaphragm 206, the first-level lever 221, the short pin 219, the square seat plate 218, the second-level lever 217, the round seat plate 214, the long pin 216, the adjusting top screw 215 and the screw 220 in the valve core assembly 200 cooperate with each other to form a corresponding lever drive assembly.

[0066] The round seat plate 214 is placed in the small concave cavity of the valve body 400, the long pin shaft 216 is inserted into the hinge shaft hole of the head of the secondary lever 217, and the long pin shaft 216 and the head of the secondary lever 217 are placed together in the small recessed groove of the round seat plate 214. The screw 220 fixes the round seat plate 214 and the long pin shaft 216 together in the small concave cavity of the valve body 400.

[0067] The short pin 219 is inserted into the hinge shaft of the head of the first-level lever 221. The short pin 219 and the head of the first-level lever 221 are placed together in the small recessed groove of the square seat plate 218. The screw 220 fixes the square seat plate 218 and the short pin 219 together in the concave cavity of the valve body 400. The power point at the tail of the secondary lever 217 cooperates with the middle of the first-level lever 221, which is the resistance point of the first-level lever 221. The first-level lever 221 can squeeze the second-level lever 217.

[0068] Furthermore, the adjusting screw 215 is screwed into the screw hole of the secondary lever 217 , and serves as a resistance point of the secondary lever 217 to cooperate with the top of the valve guide rod 205 .

[0069] In conjunction with this, the diaphragm 206 in this example is a corrugated, flexible rubber membrane that allows for large deformation. A metal disc is attached to its lower center to enhance rigidity. This metal disc engages with the power point at the tail of the primary lever 221 to drive the primary lever 221. Simultaneously, an adjustable top screw 215 is threaded into the threaded hole of the secondary lever 217. By tightening or loosening the top screw 215, the clearance between the secondary lever 217 and the valve guide stem 205 can be adjusted, eliminating any idle travel between the diaphragm 206 and the primary lever 221. The secondary lever 217 acts as a resistance point, engaging with the top of the valve guide stem 205 to squeeze it and ensure that the valve guide stem 205 is driven to open and shift.

[0070] The locking nut 208, regulating piston 209, sealing ring 210, sealing ring 211, spring washer 212 and valve stem spring 213 in the valve core assembly 200 cooperate with each other to form a corresponding pressure regulating spring assembly.

[0071] The sealing ring 210 and spring 212 are cushioned within the center hole of the regulating piston 209, while the sealing ring 211 is positioned within a groove on the outer periphery of the regulating piston 209. The valve stem spring 213 is inserted into the center of the regulating piston 209, which is located outside the lower end of the valve stem 202. The assembled regulating piston 209 is screwed into the central rotation chamber of the valve body 400 from the lower end. The regulating piston 209 has a specific adjustment range. Rotating the regulating piston 209 adjusts the preload of the valve stem spring 213 within a certain range, thereby controlling the opening pressure of the demand valve. Once the regulating piston 209 is adjusted, it is secured with the locking nut 208.

[0072] Furthermore, the lower end of the valve stem 202 passes through the sealing ring 210, out of the regulating piston 209, and into the lower cavity of the valve body 400. The diameter of the lower end of the valve stem 202 is consistent with the diameter of the sealing hole of the valve seat 204. The axial force acting on the valve stem 202 by the inlet and outlet pressures is completely balanced, and the axial force acting on the valve stem 202 by the inlet and outlet pressures is close to zero, eliminating the influence of the inlet and outlet pressures on the axial movement of the valve stem 202. The sealing ring 211 seals the regulating piston 209 and the valve body 400.

[0073] The valve lower cover assembly 300 in this example is mainly composed of a valve lower cover 301, a breathing valve flap 302, an air intake valve 303 and a valve screw 304, which cooperate with each other and have a breathing valve mechanism.

[0074] The valve lower cover 301 is in the shape of a cover with a tapered outlet pipe at the lower center, a concave cavity and an annular boss at the upper center, an inner connecting thread at the edge, and a hollow space between the annular boss and the outer edge.

[0075] The exhalation valve flap 302 is preferably in a double ring shape, with the outer ring being made of a flexible rubber material, the inner ring being hollowed out as an airway, the center being a threaded hole, and the inner and outer rings being connected by a rubber sheet.

[0076] The suction valve 303 is preferably a thin elastic rubber disc with a center hole.

[0077] The shutter screw 304 is in the shape of a cylindrical screw and has a long screw head.

[0078] In this manner, the valve screw 304 penetrates the inhalation valve 303 and is screwed into the central screw hole of the exhalation valve disc 302, securing the inhalation valve 303. The exhalation valve disc 302 is then placed within the concave cavity of the valve lower cover 301. This arrangement constitutes the exhalation valve lower cover assembly 300. The valve lower cover assembly 300 is then locked onto the lower end of the valve body 400, securing the exhalation valve disc 302 and sealing it.

[0079] The resulting direct-acting medical demand valve utilizes a diaphragm-type pressure-reducing valve structure, using a two-stage series lever to amplify the air pressure sensed by the diaphragm to operate the valve. The valve stem features a tapered sealing structure to increase sealing force and ensure sealing performance.

[0080] In specific implementation, the preload force of the valve core return spring can be selected according to the hardness of the valve seat sealing material, and the total lever ratio can be selected according to the preload force and the size of the diaphragm area to ensure the opening and closing of the valve.

[0081] The valve sealing seat is embedded in the valve seat, which has wider applicability. Different sealing materials can be selected according to different intake pressures to ensure more reliable sealing.

[0082] To compensate for the negative impact of reduced valve opening caused by the amplified lever force, this solution increases the flow rate by increasing the valve diameter. To eliminate the impact of the inlet pressure generated by the increased valve diameter on the valve opening and closing force, the valve core in this solution adopts a fully balanced structure.

[0083] This solution further adds an adjusting screw (i.e., adjusting top screw) controlled by the valve stem, eliminates the idle stroke on the upper part of the valve stem, effectively utilizes the smaller displacement of the lever, and at the same time increases the flexibility of the diaphragm and increases the deformation of the diaphragm. By increasing the deformation of the diaphragm, the valve opening displacement is increased to ensure that the valve has sufficient opening degree when working.

[0084] In addition, the solution adds an adjustment device to facilitate the adjustment of the valve stem spring force loading, eliminating the influence of processing and assembly factors on the demand valve opening pressure, and effectively adjusting the opening force of the control valve.

[0085] The medical demand valve with direct-acting structure thus formed uses a lever to amplify the weak outlet pressure signal, directly operates the valve to open, and can adjust the valve opening force, which can solve the problems of insufficient valve operating force and difficult debugging, and realize the function of the demand valve; at the same time, the valve core adopts a completely balanced structure to eliminate the force of the intake pressure change on the valve core, increase the valve opening, and ensure sufficient output flow.

[0086] The following example illustrates the operation process of the direct-acting demand valve.

[0087] See also Figure 4 , which is a schematic diagram of the working process of the present invention during inhalation.

[0088] As can be seen from the diagram, the outlet is connected to the patient's breathing mask. When the patient exhales, a certain negative pressure is generated in the breathing mask and transmitted to the valve outlet. Under the force of this negative pressure, the inhalation valve 303 is first opened, and the air is transmitted through the vertical hole in the valve body 400 into the concave cavity above the valve body 400, acting on the bottom of the diaphragm 206.

[0089] Negative pressure creates air pressure on diaphragm 206, which is connected to the atmosphere through the side holes in valve cover 101. This creates a pressure differential between the upper and lower parts of diaphragm 206. The atmospheric pressure is greater than the negative pressure, pushing diaphragm 206 downward. The metal disc at the lower center of diaphragm 206 drives the tail power point of primary lever 221, causing primary lever 221 to rotate downward around the short fulcrum pin 219, amplifying the applied force. The tail power point of secondary lever 217, aligned with the middle of primary lever 221, serves as the resistance point for primary lever 221. The force acting on the tail power point of secondary lever 217 at the resistance point of primary lever 221 drives secondary lever 217 downward around the long fulcrum pin 216.

[0090] By loosening or tightening the top screw 215, the clearance between the secondary lever 217 and the valve guide stem 205 can be adjusted, eliminating the idle travel between the diaphragm 206 and the primary lever 221. The secondary lever 217 acts as a resistance point, cooperating with the top of the valve guide stem 205 to squeeze it, further amplifying the force. Because the axial force acting on the valve stem 202 is completely balanced, the amplified force overcomes the preload of the spring, driving the valve stem 202 downward to open.

[0091] The intake air enters from the inlet, passes through the valve opening, the air passage between the valve guide rod 205 and the valve seat 204, enters the upper concave cavity of the valve body 400, and is then introduced into the lower concave cavity of the valve body 400 through the vertical hole in the valve body 400, passes through the hollow hole of the exhalation valve disc 302, opens the inhalation valve 303, and is output from the outlet to supply air to the patient.

[0092] The amplified induced force of the upper and lower pressures on diaphragm 202 forms a balance with the preload force of spring 213. The negative pressure required to open the valve is directly related to the preload force of spring 213. Adjusting piston 209 adjusts the preload force of spring 213, thereby adjusting the negative pressure required to open the valve.

[0093] When the patient stops breathing, the outlet pressure returns to atmospheric pressure. Figure 2As shown, the suction valve 103 returns to its original closed state, the pressure difference between the upper and lower parts of the diaphragm 206 disappears, and the valve stem 202 is reset under the elastic force of the spring 213, closing the valve and stopping the air supply. The diaphragm 206, valve guide rod 205, and lever mechanism are reset simultaneously, returning to their initial state.

[0094] See also Figure 5 , which is a schematic diagram of the working process of the present invention during exhalation.

[0095] When the patient exhales, air enters the concave cavity below the valve body 400. Since the inhalation valve 303 is closed, the exhalation pressure blows up the inner ring of the exhalation valve flap 302 and exhausts the exhaled air into the atmosphere through the hollow holes on the edge of the valve lower cover 301. This cycle repeats, allowing air to be delivered and terminated as needed.

[0096] See also Figure 6-Figure 8 When the patient cannot breathe on his own, artificial respiration can be performed through this device.

[0097] Depend on Figure 6 It can be seen that when the button 105 is manually pressed, the safety spring 107 and the center cap 106 push the diaphragm 206 downwards, opening the demand valve to supply air. Figure 7 As shown, releasing button 105 resets the movable sleeve 103 under the action of return spring 104, simultaneously driving button 105, safety spring 107, and center cap 106 back to their initial state. Driven by the spring force, valve stem 202 returns to its original position, closing the valve and stopping air delivery. Residual air pressure in the patient's body, in turn, acts on the inhalation valve 303 and expiratory valve flap 302, blowing it open and expelling the remaining exhaled air to the atmosphere.

[0098] When using artificial respiration, press button 105 to use artificial air supply. If the air supply pressure reaches the required air supply pressure and continues to rise beyond the air supply requirement, Figure 8 As shown, the air supply pressure will push back the diaphragm 206 and the center cap 106, overcome the elastic force of the safety spring 107, and reset the diaphragm 206 and the center cap 106, thereby closing the valve and stopping the air supply to prevent the artificial air supply pressure from being too high and injuring the patient.

[0099] As can be seen from the above, the direct-acting valve solution in this example uses a two-stage series lever to amplify the sensing force of the diaphragm to drive the valve to open. The reasonable arrangement of the two-stage lever and the structural layout have higher operational reliability. Different lever ratios can be selected according to different operating force requirements to adapt to different intake pressures. At the same time, the use of a conical valve stem structure increases the sealing force and improves the sealing effect of the valve.

[0100] This example solution uses a balanced valve core structure to eliminate the impact of changes in intake pressure on valve operation. This ensures a stable negative pressure value for valve opening and a stable flow rate, making the valve output performance unaffected by the inlet and outlet ports. The valve opening can be made larger, and the valve flow rate can be increased.

[0101] In this embodiment, the adjusting screw is also used to eliminate the assembly gap, fully utilize the stroke of the lever, and ensure that the valve has sufficient opening and sufficient output flow.

[0102] This example solution also adopts an adjustment structure composed of an adjusting piston, a locking nut, a sealing ring, a sealing ring, and a spring washer, so that the opening negative pressure value of the valve can be easily adjusted to achieve the best function and effect, eliminate the influence of part processing errors, make debugging more convenient, and increase production efficiency.

[0103] Finally, it should be noted that the present solution is not limited to the above-mentioned implementation mode, but can be modified and changed in various ways according to design requirements and other factors within the scope of the attached claims or their equivalent solutions, such as the position, form and arrangement of the lever seat, the layout of the inlet and outlet positions, the configuration of other valve core structures, the structural form of the regulating piston, the combination and disassembly of parts, etc.

[0104] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A direct-acting medical demand valve, characterized in that: The invention comprises a valve body, a valve core assembly arranged in the valve body, a valve upper cover assembly matched with the upper part of the valve body, a valve lower cover assembly matched with the lower part of the valve body, a two-stage series lever arranged in the valve body, a diaphragm arranged in the valve body, and a pressure-regulating spring assembly arranged in the valve body, the valve upper cover assembly is arranged at the upper end of the valve body, the diaphragm seal is arranged between the valve upper cover assembly and the upper end of the valve body, and contacts and cooperates with the valve upper cover assembly; the valve core assembly is arranged in the valve body through the pressure-regulating spring assembly, and contacts and cooperates with the diaphragm through the two-stage series lever, and the two-stage series lever amplifies the air pressure sensed by the diaphragm to operate the opening and closing of the valve; the valve lower cover assembly is arranged at the lower end of the valve body and cooperates with the valve core assembly; The valve cover assembly mainly includes a center cap, a movable sleeve, a safety spring, a button, a screw cover, a return spring and a valve cover, wherein the safety spring is placed in the central concave cavity of the center cap, the center cap is placed in the movable sleeve, the button is in the shape of a round cover, the upper edge portion is covered and arranged above the movable sleeve, the lower central concave cavity fits the safety spring, the safety spring is screwed into the movable sleeve by the button in a threaded manner, the return spring is placed in the lower annular cavity of the movable sleeve, and then the movable sleeve is placed in the screw cover, and the upper button is screwed into the central cavity of the valve cover by a threaded manner. When performing artificial respiration, the button in the valve cover assembly is pressed, and the center cap pushes the diaphragm in the valve core assembly to move downward by the safety spring, opening the demand valve to supply air; after the air supply is completed, the button is released, and under the action of the return spring, the movable sleeve is reset, and at the same time, the button, safety spring and center cap are reset and restored to the initial state. Driven by the spring elastic force, the valve stem of the valve core assembly is reset, the valve is closed, and the air supply is stopped; The valve core assembly mainly includes a valve stem, a valve seat seal, a valve seat and a valve guide rod. The valve seat seal is embedded in the inner cavity of the lower part of the valve seat; the valve guide rod is placed in the central circular hole of the valve seat. The lower part of the valve guide rod cooperates with the upper end of the valve stem to squeeze each other and transmit lever power. The non-circular valve guide rod cooperates with the central circular hole of the valve seat to form an air passage. The valve lower cover assembly mainly includes a valve lower cover, a breathing valve disc, an inhalation valve and a valve screw; the valve screw penetrates the inhalation valve and is screwed into the central screw hole of the exhalation valve disc in a threaded manner to fix the inhalation valve; the exhalation valve disc is then placed in the concave cavity in the valve lower cover.

2. The direct-acting medical demand valve according to claim 1, characterized in that: The diaphragm is a corrugated rubber flexible diaphragm with a metal disc attached to the center of the lower part.

3. The direct-acting medical demand valve according to claim 1, characterized in that: The two-stage series lever includes a primary lever and a secondary lever, wherein the power point at the tail of the secondary lever cooperates with the middle of the primary lever and serves as the resistance point of the primary lever.

4. The direct-acting medical demand valve according to claim 3, characterized in that: The head of the secondary lever has a hinge hole as a fulcrum, the end is a power point, and the middle screw hole on the fulcrum side is a resistance point.

5. The direct-acting medical demand valve according to claim 3, characterized in that: The secondary lever is provided with an adjusting top screw, which serves as a secondary lever resistance point and cooperates with the top of the valve guide rod in the valve core assembly.

6. The direct-acting medical demand valve according to claim 3, characterized in that: The head of the first-level lever is provided with a hinge shaft hole as a fulcrum, the end is a power point, and the middle side close to the fulcrum is a resistance point.

7. The direct-acting medical demand valve according to claim 1, characterized in that: The pressure regulating spring assembly comprises a locking nut, an adjusting piston, a sealing ring, a spring washer and a valve stem spring; the sealing ring and the spring washer are placed in the adjusting piston, and the adjusting piston is fixed by a locking nut, which cooperates with the valve stem spring.

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