Medical oxygen pressurized oxygen cabin door anti-misopening bolt device

Abstract

The utility model provides a kind of medical oxygen pressurized oxygen cabin door anti-misoperation latch device, belong to medical oxygen pressurized oxygen cabin technical field, this medical oxygen pressurized oxygen cabin door anti-misoperation latch device includes latch body, limit block and cabin door connecting seat, the latch body is slender rod structure, one end of the latch body is provided with operating end, the other end of the latch body is provided with insertion end, the cross-sectional area of the insertion end is less than the cross-sectional area of the operating end, the limit block is fixedly installed on cabin door frame, limit block inside is equipped with latch passageway, the inlet end diameter of the latch passageway is greater than the outlet end diameter, the insertion end of the latch body passes through the latch passageway and is locked with the cabin door connecting seat cooperation;It can solve the mechanism that existing locking device lacks from gas pressure change self-adapting enhanced locking force, cannot fundamentally prevent misoperation of opening under pressurized state from structure, there is major use safety hazard problem.

Description

Technical Field

[0001] This utility model belongs to the technical field of medical oxygen pressurization chambers, specifically, it relates to a door anti-accidental opening latch device for a medical oxygen pressurization chamber. Background Technology

[0002] Medical oxygen pressurization chambers are important medical devices in clinical treatment, widely used for the treatment of carbon monoxide poisoning, decompression sickness, gas gangrene, and ischemic hypoxic diseases. The chamber is filled with high-pressure oxygen, raising the internal pressure to 1.5 to 3 times atmospheric pressure. Breathing in this hyperbaric oxygen environment significantly improves blood oxygen levels and tissue oxygenation, achieving therapeutic goals. During pressurization and treatment, the chamber door must remain reliably locked. Any accidental opening will cause the high-pressure gas inside to be released instantly, generating tremendous impact and airflow, which can cause serious injury to patients and medical staff, and may also damage the chamber structure and surrounding facilities. Commonly used door locking methods in existing technologies include rotary mechanical locks, bolt locks, and electromagnetic locks. These locking devices are typically designed with a fixed locking force, achieving locking through the mechanical engagement of a latch or pin with the door frame. However, this fixed locking force design has a significant flaw. When the pressure inside the oxygen chamber increases, the outward pushing force on the hatch also increases. If the locking force design margin is insufficient, locking failure may occur under high pressure. More seriously, if operators do not operate according to procedures and attempt to unlock the hatch before the internal pressure has completely dropped to a safe level, the fixed-force mechanical or electromagnetic lock cannot sense the internal pressure and can still be forcibly unlocked, causing the hatch to violently open under the pressure difference and leading to a catastrophic accident. Utility Model Content

[0003] In view of this, the present invention provides a medical oxygen pressurization chamber door anti-accidental opening latch device, which can solve the problem that the existing medical oxygen pressurization chamber door locking devices usually adopt mechanical locks or electromagnetic lock structures. These locking devices rely on a fixed locking force to prevent the door from opening during the pressurization process. However, as the internal air pressure of the oxygen chamber increases continuously during the pressurization process, the outward pushing force on the door also increases. When the air pressure reaches a high level, the fixed locking force may not be sufficient to resist the door pushing force. Moreover, the operator may accidentally operate the unlocking device before fully confirming that the air pressure inside the chamber has dropped to a safe value, causing the door to open suddenly and causing a serious safety accident. The existing locking devices lack a mechanism to adaptively increase the locking force with changes in air pressure, and cannot fundamentally prevent accidental opening operations under pressurization conditions, posing a significant safety hazard.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a medical oxygen pressurized chamber door anti-accidental opening latch device to prevent the oxygen chamber door from being accidentally opened under pressurization. It includes a latch body, a limiting block, and a door connecting seat. The latch body has a slender rod-like structure, with an operating end at one end and an insertion end at the other end. The cross-sectional area of ​​the insertion end is smaller than that of the operating end. The limiting block is fixedly installed on the door frame, and a latch channel is formed inside the limiting block. The diameter of the inlet end of the latch channel is larger than... The diameter of the outlet end is such that the insertion end of the pin body passes through the pin channel and locks with the door connecting seat. The door connecting seat is fixed on the door body and has a locking hole. The insertion end is inserted into the locking hole to achieve locking. A pressure-sensing contact surface is formed between the limiting block and the pin body. When the internal air pressure of the oxygen chamber increases, the pin body is pushed outward by the door and squeezes against the contact surface of the limiting block. The squeezing action prevents the pin body from exiting the pin channel.

[0006] The technical effects of the anti-accidental opening latch device for the door of a medical oxygen pressurized chamber provided by this utility model are as follows: By setting a pressure-sensing contact surface structure between the latch body and the limiting block, when the internal air pressure of the oxygen chamber increases, the door is pushed outward and transmitted to the latch body, causing the contact surface between the latch body and the limiting block to exert a squeezing effect. Due to the conical structure design of the inlet diameter of the latch channel being larger than the outlet diameter, the higher the air pressure, the greater the squeezing force, and the less likely the latch body is to retract from the latch channel. This achieves an adaptive anti-accidental opening function where the higher the air pressure, the more secure the lock, effectively preventing safety accidents caused by operators accidentally opening the door while the oxygen chamber is pressurized.

[0007] Based on the above technical solution, the anti-accidental opening latch device for the door of the medical oxygen pressurized oxygen chamber of this utility model can be further improved as follows:

[0008] The pin channel has a transition slope between its inlet and outlet ends, and the angle between the transition slope and the axis of the pin body is 15° to 45°.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting a transition slope between the inlet and outlet ends of the latch channel and limiting the angle between the transition slope and the axis of the latch body to the range of 15° to 45°, the latch body can generate a self-locking effect along the transition slope when it is subjected to the door thrust. If the angle is too small, the self-locking effect will not be obvious, and if the angle is too large, the latch body will easily get stuck and cannot be opened normally. This angle range ensures reliable locking under pressurized conditions and also ensures smooth unlocking after depressurization.

[0010] Furthermore, the insertion end surface of the pin body is provided with a plurality of annular protrusions, and an annular groove is formed between adjacent annular protrusions, wherein the outer diameter of the annular protrusion is larger than the outer diameter of the annular groove.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting multiple annular protrusions and annular grooves between adjacent annular protrusions on the insertion end surface of the pin body, when the pin body is inserted into the locking hole, the annular protrusions form multi-point contact with the inner wall of the locking hole, which increases the friction and biting force. At the same time, the annular grooves provide buffer space for deformation, so that the pin body can form a stronger mechanical locking effect with the limiting block when subjected to air pressure thrust, further improving the reliability and stability of preventing accidental opening.

[0012] Furthermore, the operating end is provided with anti-slip texture, which is distributed in a grid pattern on the outer surface of the operating end.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting the anti-slip texture in a grid pattern on the surface of the operating end, the coefficient of friction between the operator's hand and the operating end is increased, so that the operator can still hold the operating end firmly even when wearing gloves or with wet hands, making it easier to pull out the latch body to unlock the hatch after depressurization. At the same time, the grid pattern has a better multi-directional anti-slip effect than other texture forms, adapting to different angles of grip operation, and improving the ease of operation and safety of the device.

[0014] Furthermore, the inner wall of the pin channel outlet end of the limiting block is provided with a conical boss, the top of which points towards the inlet end of the pin channel.

[0015] The beneficial effects of the above-mentioned improvement scheme are as follows: by setting a conical protrusion on the inner wall of the pin channel outlet end of the limiting block, and with the top of the conical protrusion pointing towards the pin channel inlet end, when the pin body moves outward under air pressure, the insertion end of the pin body will wedge with the conical protrusion. The greater the air pressure, the stronger the clamping force, forming a two-stage locking mechanism. This, combined with the conical structure of the pin channel, produces a double self-locking effect. Even if the pin body undergoes a slight displacement under external force, the conical protrusion can still effectively prevent it from continuing to exit.

[0016] Furthermore, the insertion end of the pin body is provided with a spherical head, the diameter of which is larger than the diameter of the insertion end rod.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By setting a spherical head with a diameter larger than the diameter of the insertion end of the pin body, when the pin body is fully inserted into the locking hole, the spherical head is stuck in the deep section of the locking hole, forming a physical limiting structure to prevent the pin body from automatically exiting under air pressure fluctuations or vibrations. At the same time, the smooth shape of the spherical head can reduce the frictional resistance with the inner wall of the locking hole during insertion and extraction, which not only ensures the stability of the locked state, but also facilitates the unlocking operation after depressurization, thus achieving a balance between reliable locking and convenient operation.

[0018] Furthermore, the locking hole of the hatch connecting seat is a stepped hole structure, which includes a shallow hole section and a deep hole section. The diameter of the shallow hole section is smaller than the diameter of the deep hole section, and a stepped surface is formed between the shallow hole section and the deep hole section.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by designing the locking hole of the hatch connecting seat as a stepped hole structure including a shallow hole section and a deep hole section, and the diameter of the shallow hole section is smaller than that of the deep hole section, and a stepped surface is formed between the two sections, the spherical head of the pin body can be accurately positioned in the deep hole section, while the insertion end rod body is guided and supported by the shallow hole section. The stepped surface provides axial limiting for the spherical head. This stepped mating structure not only improves the mating accuracy between the pin body and the locking hole, but also enhances the shear resistance of the overall structure, effectively preventing the pin body from bending, deforming or breaking under high air pressure impact.

[0020] Furthermore, the limiting block is made of stainless steel, and its outer surface is polished to a mirror finish.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by using stainless steel to make the limiting block and polishing the outer surface of the limiting block to make it mirror-like, stainless steel has excellent corrosion resistance and mechanical strength, which can resist oxidation in the medical oxygen environment and wear during long-term use. The mirror polishing treatment not only improves the surface smoothness and reduces the coefficient of friction, making it easier to insert and pull out the pin body, but also facilitates daily cleaning and disinfection, meets the hygiene requirements of medical devices, and extends the service life of the device.

[0022] Furthermore, a transition arc segment is provided between the operating end and the insertion end of the pin body, and the radius of curvature of the transition arc segment is 2 to 5 times the diameter of the insertion end.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting a transition arc segment with a radius of curvature of 2 to 5 times the diameter of the insertion end between the operating end and the insertion end of the pin body, the stress concentration phenomenon caused by right angle or sharp corner structure is avoided, making the stress distribution of the pin body more uniform when subjected to air pressure thrust, reducing the risk of fatigue fracture of the pin body under high pressure environment. At the same time, the smooth transition arc segment can reduce the interference with the pin channel of the limit block during insertion and withdrawal, improving the smoothness and comfort of operation. The optimized radius of curvature range ensures both structural strength and manufacturability.

[0024] Furthermore, the outer wall of the hatch connecting seat is provided with reinforcing ribs, which are evenly distributed along the circumference of the hatch connecting seat, and the thickness of the reinforcing ribs is 1 / 2 to 2 / 3 of the wall thickness of the hatch connecting seat.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By setting reinforcing ribs evenly distributed along the circumference on the outer wall of the hatch connecting seat, and setting the thickness of the reinforcing ribs to 1 / 2 to 2 / 3 of the thickness of the hatch connecting seat wall, the overall rigidity and deformation resistance of the hatch connecting seat are significantly improved. When the internal pressure of the oxygen chamber acts on the hatch and is transmitted to the hatch connecting seat, the reinforcing ribs can effectively distribute and bear the load, preventing the hatch connecting seat from undergoing plastic deformation under long-term high pressure, which would cause the locking hole position to shift. This ensures the precise fit between the pin body and the locking hole, maintains the long-term reliability of the anti-misoperation device, and at the same time, this thickness ratio ensures the reinforcement effect while avoiding excessive weight increase.

[0026] Compared with existing technologies, the beneficial effects of the anti-accidental opening latch device for the medical oxygen pressurized chamber door provided by this utility model are as follows: This utility model innovatively designs a conical channel mating structure between the latch body and the limiting block. Utilizing the outward pushing force generated by the internal air pressure of the oxygen chamber acting on the door, a self-locking effect is created at the contact surface between the latch body and the limiting block. This achieves an adaptive anti-accidental opening function where the locking force increases with higher air pressure, fundamentally solving the problem of insufficient fixing and locking force in existing technologies. The entire device adopts a purely mechanical structure design, independent of electrical or electronic control systems, possessing extremely high reliability and stability, and its protective function will not be affected by power failures or electronic component malfunctions. The annular protrusion on the latch body and the conical protrusion on the limiting block form a double self-locking mechanism, ensuring that the door will not be accidentally opened even in extreme conditions. The stepped hole structure and the spherical head mating design ensure precise positioning and stable locking of the latch body, preventing accidental unlocking under vibration or impact conditions. The anti-slip texture and smooth transition section of the operating end ensure ease of operation, allowing operators to easily unlock the device after depressurization. The stainless steel material and mirror-polished finish ensure long-term stable operation of the device in medical oxygen environments, meeting the stringent requirements of medical devices. The reinforced rib structure improves the load-bearing capacity of the door connector, guaranteeing that locking accuracy does not decrease after long-term use. Overall, this invention provides a simple, reliable, and highly protective solution for preventing accidental opening of medical oxygen chamber doors, significantly improving the safety of oxygen chamber use. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a device for preventing accidental opening of the door of a medical oxygen pressurization chamber;

[0029] Figure 2 A schematic diagram of the structure of the insertion end surface of the pin body;

[0030] Figure 3 A schematic diagram of the locking hole of the hatch connector;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Plugging body; 20. Limiting block; 30. Door connecting seat. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-3 The diagram shows a schematic of a medical oxygen pressurized chamber door anti-accidental opening latch device provided by this utility model. In the diagram, it is used to prevent the oxygen chamber door from being accidentally opened under pressurization. It includes a latch body 10, a limiting block 20, and a door connecting seat 30. The latch body has a slender rod-like structure, with an operating end at one end and an insertion end at the other end. The cross-sectional area of ​​the insertion end is smaller than that of the operating end. The limiting block is fixedly installed on the door frame, and an opening is provided inside the limiting block. The latch channel has an inlet diameter larger than the outlet diameter. The insertion end of the latch body passes through the latch channel and locks with the hatch connecting seat. The hatch connecting seat is fixed to the hatch body and has a locking hole. The insertion end is inserted into the locking hole to lock. A pressure-sensitive contact surface is formed between the limiting block and the latch body. When the internal pressure of the oxygen chamber increases, the latch body is pushed outward by the hatch and squeezed against the contact surface of the limiting block. The squeezing action prevents the latch body from exiting the latch channel.

[0035] In the above technical solution, a transition slope is provided between the inlet and outlet ends of the pin channel, and the angle formed between the transition slope and the axis of the pin body is 15°~45°.

[0036] Furthermore, in the above technical solution, the insertion end surface of the pin body is provided with multiple annular protrusions, and annular grooves are formed between adjacent annular protrusions. The outer diameter of the annular protrusions is larger than the outer diameter of the annular grooves.

[0037] Furthermore, in the above technical solution, the operating end is provided with anti-slip texture, which is distributed in a grid pattern on the outer surface of the operating end.

[0038] Furthermore, in the above technical solution, a conical boss is provided on the inner wall of the pin channel outlet end of the limiting block, and the top of the conical boss points towards the inlet end of the pin channel.

[0039] Furthermore, in the above technical solution, the insertion end of the pin body is provided with a spherical head, the diameter of which is larger than the diameter of the insertion end rod.

[0040] Furthermore, in the above technical solution, the locking hole of the hatch connecting seat is a stepped hole structure, which includes a shallow hole section and a deep hole section. The diameter of the shallow hole section is smaller than the diameter of the deep hole section, and a step surface is formed between the shallow hole section and the deep hole section.

[0041] Furthermore, in the above technical solution, the limiting block is made of stainless steel, and the outer surface of the limiting block is polished to a mirror finish.

[0042] Furthermore, in the above technical solution, a transition arc segment is provided between the operating end and the insertion end of the pin body, and the radius of curvature of the transition arc segment is 2 to 5 times the diameter of the insertion end.

[0043] Furthermore, in the above technical solution, the outer wall of the hatch connecting seat is provided with reinforcing ribs, which are evenly distributed along the circumference of the hatch connecting seat, and the thickness of the reinforcing ribs is 1 / 2 to 2 / 3 of the wall thickness of the hatch connecting seat.

[0044] The following is a specific embodiment 1 of this utility model: The medical oxygen pressurized oxygen chamber door anti-accidental opening latch device provided in this embodiment is made of high-quality 304 stainless steel bar, with an overall length of 180mm. The insertion end is 100mm long and 12mm in diameter, while the operating end is 80mm long and 20mm in diameter. The two ends are connected by a circular arc with a radius of curvature of 30mm, forming a smooth variable diameter structure. Five annular protrusions are evenly distributed axially on the surface of the insertion end. Each annular protrusion has an outer diameter of 13mm and a height of 0.5mm. The distance between adjacent annular protrusions is 15mm, and the annular groove between the annular protrusions has an outer diameter of 12mm, forming a periodic convex-concave structure. The end of the insertion end is provided with a spherical head with a diameter of 16mm. The surface of the spherical head has been precision ground to a surface roughness of Ra0.8. The outer surface of the operating end is knurled to create a grid-like anti-slip texture with a grid spacing of 2mm and a texture depth of 0.3mm, ensuring good anti-slip performance without excessive wear on gloves. The limiting block is made of 316L stainless steel using a precision casting process, with dimensions of 60mm long, 40mm wide, and 35mm high. It is fixed to the predetermined position on the oxygen chamber door frame using four M8 bolts. The inner pin channel of the limiting block has an inlet diameter of 14mm and an outlet diameter of 12.5mm, with a total channel length of 35mm. The transition slope between the inlet and outlet ends forms a 25° angle with the axis. This angle has been repeatedly tested and verified to ensure a self-locking effect while facilitating unlocking operations after pressure relief. The inner wall of the pin channel outlet end has a 3mm high conical boss with a top diameter of 11mm, a bottom diameter of 12.5mm, and a cone angle of 60 degrees. The outer surface of the limiting block undergoes multiple polishing processes to achieve a mirror finish, which is both aesthetically pleasing and easy to clean and disinfect. The hatch connecting seat is made of aluminum alloy and CNC machined. It is cylindrical in shape, with an outer diameter of 50mm and a height of 30mm. It is fixed to the inner side of the hatch body with three M6 bolts. A stepped hole is located in the center of the connecting seat. The shallow section has a diameter of 13mm and a depth of 15mm, while the deep section has a diameter of 17mm and a depth of 15mm. A 2mm wide annular step is formed between the two sections. The spherical head is inserted into the deep section, where the step provides axial restraint. Six reinforcing ribs are evenly distributed circumferentially on the outer wall of the hatch connecting seat. Each rib has a radial height of 8mm, a circumferential width of 5mm, and a thickness of 2mm. The ribs are integrally machined with the hatch connecting seat body, and the connection points are rounded to avoid stress concentration. The fit clearances of all components in the entire system are precisely controlled. The fit clearance between the insertion end of the pin body and the pin channel is 0.25mm~0.5mm, ensuring both smooth insertion and effective self-locking.

[0045] The following is another specific embodiment 2 of this utility model: Embodiment 2 is based on Embodiment 1, but the number of annular protrusions on the insertion end surface of the pin body is increased to 8, the outer diameter of each annular protrusion is reduced to 12.8 mm, and the distance between adjacent annular protrusions is shortened to 8 mm, forming a denser protrusion distribution. This improvement creates more contact points between the pin body and the inner wall of the pin channel, significantly enhancing friction and engagement force, and further improving the reliability of the self-locking effect. Simultaneously, a guide chamfer with a diameter of 15 mm and a depth of 5 mm is added to the pin channel entrance end of the limiting block, making it easier to align the pin body with the center of the pin channel during insertion, reducing insertion difficulties caused by alignment deviations, and improving operational convenience and success rate. Practical use verification shows that this improved solution, while maintaining the original anti-misoperation performance, increases the success rate of insertion operations by approximately 20 percentage points, making it particularly suitable for oxygen chamber applications requiring frequent operation. Operators report that this improvement significantly enhances the user experience.

[0046] The following is another specific embodiment 3 of this utility model: Embodiment 3 is based on Embodiment 1. An axial blind hole with a diameter of 8mm and a depth of 40mm is opened inside the operating end of the latch body. A stainless steel spring is installed inside the blind hole. One end of the spring rests against the bottom of the blind hole, and the other end acts on the entrance end face of the latch channel through a stainless steel pressure block. The free length of the spring is 45mm, the working length is 38mm, and the spring stiffness is 0.5N / mm. This improvement ensures that the latch body is slightly pulled back by the spring in the normal locked state, maintaining a tight insertion and preventing loosening or slight withdrawal of the latch body due to vibration or slight impact. Simultaneously, a 2mm deep annular groove is added to the bottom of the deep hole section of the locking hole in the door connector to accommodate slight deformation of the spherical head under spring tension, ensuring a precise fit even after long-term use. This improved solution is particularly suitable for oxygen chamber environments with significant vibration or frequent door opening and closing operations, effectively preventing the accumulation of small displacements caused by fatigue in the latch body during long-term use.

[0047] Specifically, the principle of this invention is as follows: The core technology of this device utilizes the direct physical connection between the internal air pressure of the oxygen chamber and the door thrust, achieving a self-locking effect where the locking force adaptively increases with air pressure through ingenious mechanical structure design. When the oxygen chamber begins to pressurize, the increased internal air pressure causes the door to experience an outward thrust. This thrust is transmitted through the door body to the door connector fixed to the door, and then acts outward through the pin body inserted into the locking hole. Since the insertion end of the pin body passes through the pin channel within the limiting block, and the pin channel is designed as a conical structure with an inlet diameter larger than the outlet diameter, when the pin body attempts to move outward under the door thrust, a wedge-shaped locking effect is generated between the pin body and the inner wall of the pin channel. According to the principle of frictional self-locking, when the cone angle of the conical channel is within a certain range, the normal pressure will generate a sufficiently large frictional force to prevent the axial movement of the pin body. Moreover, the greater the door thrust, the greater the normal pressure and the greater the frictional force, thus forming a self-locking state. The annular protrusion on the insertion end of the pin increases the contact area and locking force with the inner wall of the channel, while the conical protrusion on the inner wall of the outlet end of the limiting block provides a secondary locking effect. Together, they form a double self-locking mechanism. When the oxygen chamber is depressurized, the pressure difference between the inside and outside of the chamber disappears, the hatch no longer exerts outward pushing force, the clamping force between the pin and the limiting block disappears, the self-locking effect is released, and the operator can easily pull out the pin to unlock it. The spherical head of the pin and the stepped hole of the hatch connecting seat provide precise axial positioning, preventing accidental movement of the pin during pressure fluctuations. The entire anti-accidental opening mechanism relies entirely on the physical action of air pressure and the geometric relationship of the mechanical structure, without requiring sensors to detect pressure or a control system to make judgments, thus possessing inherent safety and extremely high reliability.

[0048] Before starting oxygen therapy, the operator first confirms that the cabin door is closed. The operator aligns the insertion end of the pin with the locking hole on the cabin door connector and pushes it axially. The insertion end passes through the pin channel of the limiting block, and the annular protrusion on the surface of the insertion end passes through the conical section of the pin channel. When a clicking sound or change in resistance is heard or felt as the pin is inserted, it indicates that the spherical head has entered the deep section of the locking hole, and the pin is locked. At this point, the oxygen chamber's pressurization system is activated, filling the chamber with high-pressure oxygen. As the pressure inside the chamber gradually increases, the cabin door experiences an outward pushing force. This force acts on the limiting block through the cabin door connector and the pin, creating a self-locking state between the pin and the pin channel of the limiting block. The higher the pressure, the stronger the self-locking force. Throughout the pressurization treatment process, even if the operator accidentally attempts to pull out the pin, the self-locking effect prevents it from being pulled out, and the cabin door remains reliably locked. After treatment, the depressurization system of the oxygen chamber is activated to gradually release the high-pressure gas inside. When the pressure inside the chamber drops to near atmospheric pressure, the pressure gauge installed in the oxygen chamber confirms that the pressure difference between the inside and outside of the chamber has been eliminated. At this point, the door is no longer subjected to outward pushing force, the clamping force between the latch and the limiting block disappears, and the self-locking effect is automatically released. The operator holds the operating end of the latch, utilizing the anti-slip texture on the surface for a good grip, and pulls the latch outward axially. The insertion end passes through the conical protrusion of the limiting block and the latch channel in sequence. Once fully withdrawn, the door can be opened. The entire operation process is simple and intuitive, requiring no special training. Furthermore, the mechanical self-locking principle fundamentally prevents accidental opening under pressure.

Claims

1. A latch device for preventing accidental opening of the door of a medical oxygen pressurization chamber, used to prevent the chamber door from being accidentally opened under pressurization, characterized in that, The device includes a latch body, a limiting block, and a door connecting seat. The latch body is a slender rod-shaped structure with an operating end at one end and an insertion end at the other end. The cross-sectional area of ​​the insertion end is smaller than that of the operating end. The limiting block is fixedly installed on the door frame and has a latch channel inside. The diameter of the inlet end of the latch channel is larger than that of the outlet end. The insertion end of the latch body passes through the latch channel and engages with the door connecting seat for locking. The door connecting seat is fixed to the door body and has a locking hole. The insertion end is inserted into the locking hole to achieve locking. A pressure-sensitive contact surface is formed between the limiting block and the latch body. When the internal pressure of the oxygen chamber increases, the latch body is pushed outward by the door and is squeezed against the contact surface of the limiting block. This squeezing action prevents the latch body from exiting the latch channel.

2. The anti-accidental opening latch device for the door of a medical oxygen pressurized oxygen chamber according to claim 1, characterized in that, A transition slope is provided between the inlet and outlet ends of the pin channel, and the angle between the transition slope and the axis of the pin body is 15° to 45°.

3. The anti-accidental opening latch device for the door of a medical oxygen pressurization chamber according to claim 2, characterized in that, The insertion end surface of the pin body is provided with a plurality of annular protrusions, and an annular groove is formed between adjacent annular protrusions. The outer diameter of the annular protrusions is larger than the outer diameter of the annular groove.

4. The anti-accidental opening latch device for the door of a medical oxygen pressurization chamber according to claim 3, characterized in that, The operating end is provided with anti-slip texture, which is distributed in a grid pattern on the outer surface of the operating end.

5. The anti-accidental opening latch device for the door of a medical oxygen pressurization chamber according to claim 4, characterized in that, The inner wall of the pin channel outlet end of the limiting block is provided with a conical boss, the top of which points towards the inlet end of the pin channel.

6. The anti-accidental opening latch device for the door of a medical oxygen pressurized oxygen chamber according to claim 5, characterized in that, The insertion end of the pin body is provided with a spherical head, the diameter of which is larger than the diameter of the insertion end rod.

7. The anti-accidental opening latch device for the door of a medical oxygen pressurization chamber according to claim 6, characterized in that, The locking hole of the hatch connecting seat is a stepped hole structure, which includes a shallow hole section and a deep hole section. The diameter of the shallow hole section is smaller than the diameter of the deep hole section, and a step surface is formed between the shallow hole section and the deep hole section.

8. The anti-accidental opening latch device for the door of a medical oxygen pressurization chamber according to claim 7, characterized in that, The limiting block is made of stainless steel, and its outer surface is polished to a mirror finish.

9. The anti-accidental opening latch device for the door of a medical oxygen pressurized oxygen chamber according to claim 8, characterized in that, A transition arc segment is provided between the operating end and the insertion end of the pin body, and the radius of curvature of the transition arc segment is 2 to 5 times the diameter of the insertion end.

10. The anti-accidental opening latch device for the door of a medical oxygen pressurized oxygen chamber according to claim 9, characterized in that, The outer wall of the hatch connecting seat is provided with a reinforcing rib plate, which is evenly distributed along the circumference of the hatch connecting seat, and the thickness of the reinforcing rib plate is 1 / 2 to 2 / 3 of the wall thickness of the hatch connecting seat.

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