Oxygen cabin control system

Abstract

The utility model discloses an oxygen cabin control system, which comprises an MCU (Microprogrammed Control Unit) module, a power supply module, a detection module, an input module, an output module and an execution module, the MCU module is electrically connected with the power supply module, the input module and the output module respectively; the input module is electrically connected with the detection module; the output module is electrically connected with the execution module; the detection module comprises a touch screen, a scram button and an oxygen concentration sensor; the execution module comprises an air compressor, a molecular sieve oxygen generation unit and a plurality of electromagnetic door stopper assemblies; the touch screen and the oxygen concentration sensor are arranged in the cabin body; the air inlet end of the air compressor is communicated with external air, the air outlet end of the air compressor is communicated with the air inlet end of the molecular sieve oxygen generation unit, and the oxygen outlet end of the molecular sieve oxygen generation unit is communicated with the interior of the cabin body; the scram button is arranged in the cabin body; a cabin door is hinged to the side edge of the cabin body; the electromagnetic door stopper assembly is arranged between the cabin body and the cabin door.

Description

Technical Field

[0001] The utility model relates to the technical field of oxygen chamber control, in particular to an oxygen chamber control system. Background Art

[0002] With the continuous development of science and technology, people's requirements for the living standard are constantly increasing, and civilian hyperbaric oxygen chambers have gradually gained the favor of many people. However, during the use of existing hyperbaric oxygen chambers, there is a lack of detection and control of the oxygen chamber, it is difficult to quickly seal and fit the chamber door and the chamber body, and supply oxygen to the chamber body. Moreover, when emergencies occur in the oxygen chamber, there are no timely detection and control measures, and the safety is poor, which is difficult to meet the actual use requirements. Content of the Utility Model

[0003] The purpose of the utility model is to provide an oxygen chamber control system, which can detect and control the oxygen chamber in time, and effectively improve the safety of using the oxygen chamber.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An oxygen chamber control system includes an MCU module, a power supply module, a detection module, an input module, an output module and an execution module; the MCU module is electrically connected to the power supply module, the input module and the output module respectively; the input module is electrically connected to the detection module and is used for collecting the detection information of the detection module; the output module is electrically connected to the execution module and is used for controlling the operation of the devices in the execution module; the detection module includes a touch screen, an emergency stop button and an oxygen concentration sensor; the execution module includes an air compressor, a molecular sieve oxygen generation unit and a plurality of electromagnetic door suction components; the touch screen and the oxygen concentration sensor are arranged inside the chamber and are used for detecting the oxygen concentration inside the chamber and displaying it on the touch screen; the air inlet end of the air compressor is communicated with the external air, the air outlet end of the air compressor is communicated with the air inlet end of the molecular sieve oxygen generation unit, and the oxygen outlet end of the molecular sieve oxygen generation unit is communicated with the inside of the chamber. When the oxygen concentration inside the chamber is lower than the threshold value, the air compressor compresses the air and conveys it to the molecular sieve oxygen generation unit, and the generated oxygen is conveyed into the chamber; the emergency stop button is arranged inside the chamber and is used for emergently closing the air compressor, the molecular sieve oxygen generation unit and the electromagnetic door suction components; the chamber door is hinged on the side of the chamber; the electromagnetic door suction components are arranged between the chamber and the chamber door and are used for sucking or separating the chamber and the chamber door.

[0006] Further, the detection module further includes a barometric pressure sensor disposed inside the cabin, and the execution module further includes a pressure relief control unit disposed on the cabin wall; the barometric pressure sensor is electrically connected to the input module, and the output module is electrically connected to the execution module, and is used to open the pressure relief control unit to communicate the inside of the cabin with the outside air when the barometric pressure inside the cabin is lower than the lowest threshold, higher than the highest threshold, or the emergency stop button is pressed.

[0007] Further, the detection module further includes a temperature and humidity sensor disposed inside the cabin, which is used to detect the temperature and humidity inside the cabin and display them on the touch screen.

[0008] Further, the execution module further includes a fan module disposed on the sides of the air compressor and the molecular sieve oxygen generation unit, which is used to cool the air compressor and the molecular sieve oxygen generation unit.

[0009] Further, the electromagnetic door suction assembly includes an electromagnet, a fixed frame, an iron block, a buffer bump, and a buffer spring; the electromagnet is installed on the cabin; one end of the fixed frame is fixedly connected to the edge of the cabin door; the iron block is fixed on the fixed frame close to the electromagnet side, and the outer edge of the cabin door is closely attached to the cabin by the attraction between the iron block and the electromagnet after the electromagnet is energized; a buffer hole is provided on the iron block; the buffer spring is located in the buffer hole, one end of the buffer spring is fixedly connected to the fixed frame, and the other end of the buffer spring is fixedly connected to the buffer bump; the outer end of the buffer bump passes through the buffer hole and extends out towards the electromagnet side, and the buffer bump is pressed back into the buffer hole by the electromagnet when closing the cabin door.

[0010] Further, mounting members are provided on the cabin; the mounting members include a mounting plate and mounting springs disposed on both sides of the mounting plate; one end of the mounting spring is fixedly connected to the cabin, and the other end of the mounting spring is fixedly connected to the mounting plate; the electromagnet is fixed on the mounting plate on the side away from the mounting spring; guide rods are respectively provided on both sides of the mounting plate; one end of the guide rod is fixedly connected to the cabin, and the other end of the guide rod passes through the mounting plate; the mounting spring is sleeved outside the guide rod between the mounting plate and the cabin.

[0011] Further, the execution module further includes a limit switch fixed on one side of the electromagnet, and the limit switch uses a microswitch; the microswitch is electrically connected to the input module, and the electromagnet is electrically connected to the output module, and is used to disconnect the circuit of the electromagnet by pressing the reed on the microswitch through the fixed frame when closing the cabin door.

[0012] Further, a silica gel ring is fixed at the position where the cabin is in close contact with the cabin door; the silica gel ring is tightly clamped between the cabin and the cabin door.

[0013] After adopting the above technical solution, the utility model has the following beneficial effects:

[0014] 1. A oxygen chamber control system of the present utility model can suck and combine the chamber body and the chamber door through an electromagnetic door suction component when the chamber door is closed for use, realizing the sealed fit of the chamber body and the chamber door; then compress the fresh air outside the chamber through an air compressor and transport it to the molecular sieve oxygen generation unit, and transport the generated oxygen into the chamber body, which can increase the oxygen concentration in the chamber, and can detect the oxygen concentration in the chamber body through an oxygen concentration sensor and display it on the touch screen; in addition, when an emergency occurs in the oxygen chamber, the emergency stop button can be pressed urgently to quickly turn off the air compressor and the molecular sieve oxygen generation unit, stop supplying too much oxygen to the chamber, and after the electromagnetic door suction component is turned off and powered off, the chamber door and the chamber body will no longer be sucked and the chamber door will bounce open and separate, which can quickly open the chamber door to avoid danger, can detect and control the oxygen chamber in time, and effectively improves the safety of using the oxygen chamber.

[0015] 2. A oxygen chamber control system of the present utility model, a pressure sensor is arranged in the chamber body, a pressure relief control unit is arranged on the chamber body wall, and the pressure relief control unit can adopt an electromagnetic valve. When the air pressure in the chamber body is lower than the lowest threshold, higher than the highest threshold or the emergency stop button is pressed, the pressure relief control unit can be opened to connect the inside of the chamber body with the outside air, quickly balancing the gas pressure inside and outside the chamber body and improving the safety of the oxygen chamber.

[0016] 3. A oxygen chamber control system of the present utility model, a temperature and humidity sensor is arranged in the chamber body, and the temperature and humidity in the chamber body can be detected through the temperature and humidity sensor and displayed on the touch screen; the air compressor can adopt a refrigerating air compressor with refrigeration function. When it is relatively hot in summer, etc., the air can be refrigerated and compressed, and after being screened by the molecular sieve oxygen generation unit to remove nitrogen in the air, the refrigerated oxygen can be transported into the chamber body, and the air compressor and the molecular sieve oxygen generation unit can be arranged outside the chamber body and cooled through a fan module.

[0017] 4. A oxygen chamber control system of the present utility model, when closing the chamber door, the buffer bump is pressed by the electromagnet and retracts into the buffer hole. Due to the buffering effect of the buffer spring, the electromagnet and the iron block can achieve soft contact when approaching gradually, and then the electromagnet and the iron block are attracted and combined after being electrified, which can further close the outer edge of the chamber door and the chamber body, realizing the sealing of the chamber door and the chamber body, and the silica gel ring can further improve the sealing effect of the chamber door and the chamber body. When the electromagnet is powered off, under the restoring force of the buffer spring and the elastic force of the silica gel ring, the electromagnet and the iron block can be separated, realizing the automatic bounce open of the chamber door from the chamber body, with simple operation and good use effect.

[0018] 5. A control system for an oxygen chamber of the present utility model. One end of the guide rod is fixedly connected to the chamber body, and the other end of the guide rod passes through the mounting plate. The mounting spring is sleeved outside the guide rod between the mounting plate and the chamber body. When the chamber door is closed, the buffer bump can drive the electromagnet to move slightly backward, realizing the soft contact between the iron block on the chamber door and the electromagnet on the chamber body, preventing the hard collision between the iron block and the electromagnet when the chamber door is closed forcefully, and improving the service life of the iron block and the electromagnet. In addition, when the chamber door is opened, the fixed frame does not press the reed on the microswitch, and the circuit of the electromagnet is disconnected. When the chamber door is closed, the fixed frame presses the reed on the microswitch, making the circuit of the electromagnet energized, so that the chamber door and the chamber body are further tightly attracted together, without keeping the circuit of the electromagnet energized all the time, effectively reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present utility model;

[0020] Figure 2 is a partial enlarged view of the connection part of the chamber body, chamber door and electromagnetic door suction assembly of the present utility model;

[0021] Figure 3 is a three-dimensional structural diagram of the chamber body and chamber door of the present utility model;

[0022] Figure 4 is a schematic structural diagram of the inside of the chamber body of the present utility model near the chamber door side;

[0023] Figure 5 is a schematic structural diagram of the connection part of the chamber body, chamber door and electromagnetic door suction assembly of the present utility model;

[0024] Figure 6 is an exploded view of the electromagnetic door suction assembly of the present utility model;

[0025] Figure 7 is an exploded view of a part of the chamber body, silica gel ring and chamber door of the present utility model.

[0026] The reference numerals in the drawings are shown as:

[0027] 1. MCU module; 2. Power supply module; 3. Detection module; 31. Touch screen; 32. Emergency stop button; 33. Oxygen concentration sensor; 34. Air pressure sensor; 35. Temperature and humidity sensor; 36. Limit switch; 4. Input module; 5. Output module; 6. Execution module; 61. Air compressor; 62. Molecular sieve oxygen generation unit; 63. Electromagnetic door suction assembly; 630. Electromagnet; 631. Fixed bracket; 632. Iron block; 6320. Buffer hole; 633. Buffer bump; 634. Buffer spring; 635. Mounting part; 6350. Mounting plate; 6351. Mounting spring; 6352. Guide rod; 64. Pressure relief control unit; 65. Fan module; 7. Cabin body; 71. Cabin door; 72. Silicone ring. Detailed implementation manners

[0028] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0029] Please refer to Figures 1 to 7, An oxygen chamber control system, comprising an MCU module 1, a power supply module 2, a detection module 3, an input module 4, an output module 5 and an execution module 6; the MCU module 1 is electrically connected to the power supply module 2, the input module 4 and the output module 5 respectively; the input module 4 is electrically connected to the detection module 3 for collecting the detection information of the detection module 3; the output module 5 is electrically connected to the execution module 6 for controlling the operation of the devices in the execution module 6; the detection module 3 includes a touch screen 31, an emergency stop button 32 and an oxygen concentration sensor 33; the execution module 6 includes an air compressor 61, a molecular sieve oxygen generation unit 62 and a plurality of electromagnetic door suction components 63; the touch screen 31 and the oxygen concentration sensor 33 are arranged inside the chamber body 7 for detecting the oxygen concentration inside the chamber body 7 and displaying it on the touch screen 31; the air inlet end of the air compressor 61 is communicated with the external air, the air outlet end of the air compressor 61 is communicated with the air inlet end of the molecular sieve oxygen generation unit 62, and the oxygen outlet end of the molecular sieve oxygen generation unit 62 is communicated with the inside of the chamber body 7, for when the oxygen concentration inside the chamber body 7 is lower than the threshold value, compressing the air by the air compressor 61 and delivering it to the molecular sieve oxygen generation unit 62 and delivering the generated oxygen to the inside of the chamber body 7; wherein, the air compressor 61 can adopt an existing refrigeration air compressor with the function of refrigerating air, the molecular sieve oxygen generation unit 62 can adopt an existing molecular sieve oxygen generator that can filter out nitrogen in the air, and the specific structures of the air compressor 61 and the molecular sieve oxygen generation unit 62 will not be described in detail one by one; the emergency stop button 32 is arranged inside the chamber body 7 for urgently closing the air compressor 61, the molecular sieve oxygen generation unit 62 and the electromagnetic door suction components 63; a chamber door 71 is hinged on the side of the chamber body 7; the electromagnetic door suction components 63 are arranged between the chamber body 7 and the chamber door 71 for sucking or separating the chamber body 7 and the chamber door 71.

[0030] As Figure 1 shown, the detection module 3 further includes a pressure sensor 34 arranged inside the chamber body 7, and the execution module 6 further includes a pressure relief control unit 64 arranged on the wall of the chamber body 7; the pressure sensor 34 is electrically connected to the input module 4, and the output module 5 is electrically connected to the execution module 6, for when the air pressure inside the chamber body 7 is lower than the lowest threshold value, higher than the highest threshold value or the emergency stop button 32 is pressed, opening the pressure relief control unit 64 to communicate the inside of the chamber body 7 with the external air.

[0031] As Figure 1 shown, the detection module 3 further includes a temperature and humidity sensor 35 arranged inside the chamber body 7 for detecting the temperature and humidity inside the chamber body 7 and displaying them on the touch screen 31.

[0032] As Figure 1 shown, the execution module 6 further includes a fan module 65 arranged on the sides of the air compressor 61 and the molecular sieve oxygen generation unit 62 for cooling the air compressor 61 and the molecular sieve oxygen generation unit 62.

[0033] As Figure 2 , Figure 5 , Figure 6 and Figure 7 shown, the electromagnetic door sucker assembly 63 includes an electromagnet 630, a fixing bracket 631, an iron block 632, a buffer bump 633 and a buffer spring 634; the electromagnet 630 is installed on the cabin body 7; one end of the fixing bracket 631 is fixedly connected to the edge of the cabin door 71; the iron block 632 is fixed on the fixing bracket 631 on the side close to the electromagnet 630, and the outer edge of the cabin door 71 is closely attached to the cabin body 7 by the attraction between the electromagnet 630 and the iron block 632 after the electromagnet 630 is energized; a buffer hole 6320 is provided on the iron block 632; the buffer spring 634 is located in the buffer hole 6320, one end of the buffer spring 634 is fixedly connected to the fixing bracket 631, and the other end of the buffer spring 634 is fixedly connected to the buffer bump 633; the outer end of the buffer bump 633 penetrates out of the buffer hole 6320 towards the side close to the electromagnet 630, and when the cabin door 71 is closed, the buffer bump 633 is pressed by the electromagnet 630 and retracts into the buffer hole 6320.

[0034] As Figure 2 , Figure 5 , Figure 6 and Figure 7 shown, an installation member 635 is provided on the cabin body 7; the installation member 635 includes an installation plate 6350 and installation springs 6351 provided on both sides of the installation plate 6350; one end of the installation spring 6351 is fixedly connected to the cabin body 7, and the other end of the installation spring 6351 is fixedly connected to the installation plate 6350; the electromagnet 630 is fixed on the installation plate 6350 on the side far from the installation spring 6351; guide rods 6352 are respectively provided on both sides of the installation plate 6350; one end of the guide rod 6352 is fixedly connected to the cabin body 7, and the other end of the guide rod 6352 penetrates through the installation plate 6350; the installation spring 6351 is sleeved outside the guide rod 6352 between the installation plate 6350 and the cabin body 7.

[0035] As Figure 1 , Figure 2 , Figure 5 and Figure 6 shown, the execution module 6 further includes a limit switch 36 fixed on one side of the electromagnet 630, and the limit switch 36 uses a micro switch; the micro switch is electrically connected to the input module 4, and the electromagnet 630 is electrically connected to the output module 5, and is used to disconnect the circuit of the electromagnet 630 by pressing the reed on the micro switch through the fixing bracket 631 when the cabin door 71 is closed.

[0036] As Figure 2 , Figure 3 , Figure 5 and Figure 7As shown, a silica gel ring 72 is fixed at the position where the cabin body 7 is in close contact with the cabin door 71; the silica gel ring 72 is tightly clamped between the cabin body 7 and the cabin door 71.

[0037] It can be understood that in the present disclosure, "a plurality of" means two or more, and other quantifiers are similar thereto. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. The singular forms of "a", "the", and "said" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0038] It can be further understood that the terms "first", "second", etc. are used to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other and do not represent a specific order or importance. In fact, the expressions such as "first" and "second" can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0039] It can be further understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0040] It can be further understood that unless otherwise specified, "connection" includes direct connection without other components between the two, and also includes indirect connection with other elements between the two.

[0041] It can be further understood that although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring these operations to be performed in the specific order shown or in a serial order, or requiring all the operations shown to obtain the desired result. In a specific environment, multitasking and parallel processing may be beneficial.

[0042] Other embodiments of the present disclosure will be readily apparent to those skilled in the art in view of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only illustrative, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0043] As mentioned above, the above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. An oxygen chamber control system, characterized in that: It includes an MCU module (1), a power supply module (2), a detection module (3), an input module (4), an output module (5), and an execution module (6); the MCU module (1) is electrically connected to the power supply module (2), the input module (4), and the output module (5) respectively; the input module (4) is electrically connected to the detection module (3) and is used to collect the detection information of the detection module (3); the output module (5) is electrically connected to the execution module (6) and is used to control the operation of the devices in the execution module (6); the detection module (3) includes a touch screen (31), an emergency stop button (32), and an oxygen concentration sensor (33); the execution module (6) includes an air compressor (61), a molecular sieve oxygen generation unit (62), and several electromagnetic door suction assemblies (63); the touch screen (31) and the oxygen concentration sensor (33) are arranged inside the cabin (7) and are used to detect the oxygen concentration inside the cabin (7) and display it on the touch screen (31); the air inlet end of the air compressor (61) is communicated with the external air, the air outlet end of the air compressor (61) is communicated with the air inlet end of the molecular sieve oxygen generation unit (62), and the oxygen outlet end of the molecular sieve oxygen generation unit (62) is communicated with the inside of the cabin (7). When the oxygen concentration inside the cabin (7) is lower than the threshold value, the air compressor (61) compresses the air and transports it to the molecular sieve oxygen generation unit (62), and the generated oxygen is transported into the cabin (7); the emergency stop button (32) is arranged inside the cabin (7) and is used to urgently shut down the air compressor (61), the molecular sieve oxygen generation unit (62), and the electromagnetic door suction assemblies (63); the cabin door (71) is hinged on the side of the cabin (7); the electromagnetic door suction assemblies (63) are arranged between the cabin (7) and the cabin door (71) and are used to suck or separate the cabin (7) and the cabin door (71).

2. The oxygen chamber control system according to claim 1, wherein: The detection module (3) further includes a pressure sensor (34) arranged inside the cabin (7), and the execution module (6) further includes a pressure relief control unit (64) arranged on the cabin wall of the cabin (7); the pressure sensor (34) is electrically connected to the input module (4), and the output module (5) is electrically connected to the execution module (6). When the air pressure inside the cabin (7) is lower than the lowest threshold value, higher than the highest threshold value, or the emergency stop button (32) is pressed, the pressure relief control unit (64) is opened to communicate the inside of the cabin (7) with the external air.

3. The oxygen chamber control system according to claim 1, characterized in that: The detection module (3) further includes a temperature and humidity sensor (35) arranged inside the cabin (7) and is used to detect the temperature and humidity inside the cabin (7) and display them on the touch screen (31).

4. The oxygen chamber control system according to claim 1, wherein: The execution module (6) further includes a fan module (65) arranged on the sides of the air compressor (61) and the molecular sieve oxygen generation unit (62) and is used to cool the air compressor (61) and the molecular sieve oxygen generation unit (62).

5. The oxygen chamber control system according to claim 1, characterized in that: The electromagnetic door sucker assembly (63) includes an electromagnet (630), a fixing bracket (631), an iron block (632), a buffer bump (633) and a buffer spring (634); the electromagnet (630) is installed on the cabin body (7); one end of the fixing bracket (631) is fixedly connected to the edge of the cabin door (71); the iron block (632) is fixed on the fixing bracket (631) on the side close to the electromagnet (630), and the cabin door (71) outer edge is closely attached to the cabin body (7) by the attraction between the electromagnet (630) and the iron block (632) after the electromagnet (630) is energized; a buffer hole (6320) is provided on the iron block (632); the buffer spring (634) is located in the buffer hole (6320), one end of the buffer spring (634) is fixedly connected to the fixing bracket (631), and the other end of the buffer spring (634) is fixedly connected to the buffer bump (633); the outer end of the buffer bump (633) penetrates out of the buffer hole (6320) towards the side close to the electromagnet (630), and when the cabin door (71) is closed, the buffer bump (633) is pressed by the electromagnet (630) and retracts into the buffer hole (6320).

6. The oxygen chamber control system according to claim 5, wherein: An installation member (635) is provided on the cabin body (7); the installation member (635) includes an installation plate (6350) and installation springs (6351) provided on both sides of the installation plate (6350); one end of the installation spring (6351) is fixedly connected to the cabin body (7), and the other end of the installation spring (6351) is fixedly connected to the installation plate (6350); the electromagnet (630) is fixed on the installation plate (6350) on the side away from the installation spring (6351); guide rods (6352) are respectively provided on both sides of the installation plate (6350); one end of the guide rod (6352) is fixedly connected to the cabin body (7), and the other end of the guide rod (6352) penetrates through the installation plate (6350); the installation spring (6351) is sleeved outside the guide rod (6352) between the installation plate (6350) and the cabin body (7).

7. The oxygen chamber control system according to claim 6, wherein: The execution module (6) further includes a limit switch (36) fixed on one side of the electromagnet (630), and the limit switch (36) uses a micro switch; the micro switch is electrically connected to the input module (4), and the electromagnet (630) is electrically connected to the output module (5), and is used to disconnect the circuit of the electromagnet (630) by pressing the reed on the micro switch through the fixing bracket (631) when closing the cabin door (71).

8. The oxygen chamber control system according to claim 1, characterized in that: A silica gel ring (72) is fixed at the position where the cabin body (7) is in close contact with the cabin door (71); the silica gel ring (72) is tightly clamped between the cabin body (7) and the cabin door (71).

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