A connection structure of a pressure reducer and a cylinder valve for an air breathing apparatus

Abstract

The application relates to the field of connecting structures, in particular to a connecting structure for a pressure reducer and a cylinder valve of an air respirator, which comprises a connecting end fixedly connected to the pressure reducer, a valve cylinder fixedly connected to the cylinder valve and detachably connected with the connecting end so that the pressure reducer is communicated with the cylinder valve, a pressure measuring block slidably connected in the valve cylinder and capable of being pushed by gas sent out by the cylinder valve to move correspondingly, a reset spring arranged in the valve cylinder and capable of forcing the pressure measuring block to reset when the cylinder valve is closed and controlling the moving distance of the pressure measuring block under different pressure gas flows, and an end cylinder of the connecting end is sleeved on the valve cylinder, the end cylinder is slidably connected with a pop-up block, the end cylinder is provided with a reaction mechanism capable of moving the pop-up block when the moving distance of the pressure measuring block under the action of the gas flow reaches the maximum, the cylinder valve can be uniformly produced, does not need to be separately manufactured and produced into two types, and the installation of the cylinder valve on two different specifications of cylinders is facilitated.

Description

Technical Field

[0001] This application relates to the field of connection structures, and in particular to a connection structure between a pressure reducer and a gas cylinder valve for an air respirator. Background Technology

[0002] An air respirator is a protective device worn in special environments, such as fires, dense smoke, oxygen deficiency, or hazardous substance leaks, to provide breathing protection for workers.

[0003] Existing self-contained breathing apparatuses generally include a pressure regulator connected to a gas cylinder, a mask worn by the user, and a supply valve located on the mask and connected to the pressure regulator to regulate the gas pressure entering the mask. The gas cylinder has a cylinder valve to control the release of gas from the cylinder, and the cylinder valve and pressure regulator are detachably connected. However, because gas cylinders have various pressure specifications, corresponding pressure regulators also exist in various sizes. When the maximum pressure the pressure regulator can withstand is less than the gas cylinder pressure, it is more likely to be damaged. To address this, the applicant filed a patent application (publication number CN207838054) that incorporates different bosses or grooves on pressure regulators and cylinder valves of different sizes. This prevents pressure regulators with lower maximum pressure withstand capabilities from connecting to cylinder valves with higher gas pressures, reducing the likelihood of accidents.

[0004] Regarding the aforementioned technologies, the cylinder valves corresponding to the two different specifications of gas cylinders are different. This means that when installing the cylinder valves to the corresponding gas cylinders, it is necessary to repeatedly confirm that the correct cylinder valve is installed on the gas cylinders with different pressures. Furthermore, the two types of cylinder valves have different connection structures with the pressure regulators and need to be manufactured separately, rather than being mass-produced in a unified manner. This results in a relatively inconvenient production and installation process for the cylinder valves. Summary of the Invention

[0005] To facilitate the production and installation of gas cylinder valves, this application provides a connection structure between a pressure reducer and a gas cylinder valve for an air respirator.

[0006] The technical solution provided in this application is as follows: A connection structure between a pressure reducer and a gas cylinder valve for an air respirator.

[0007] A connection structure between a pressure reducer and a gas cylinder valve for an air respirator includes a connecting end fixedly connected to the pressure reducer, and a valve cylinder fixedly connected to the gas cylinder valve and detachably connected to the connecting end so that the pressure reducer is connected to the gas cylinder valve. A pressure measuring block that can be moved accordingly by the gas delivered from the gas cylinder valve is slidably connected inside the valve cylinder. A return spring that can force the pressure measuring block to reset when the gas cylinder valve is closed and control the movement distance of the pressure measuring block under different pressure airflows is provided inside the valve cylinder. An end cylinder sleeved on the connecting end is provided, and a pop-out block is slidably connected to the end cylinder. The end cylinder is provided with a reaction mechanism that causes the pop-out block to move when the pressure measuring block moves to its maximum distance under the action of airflow.

[0008] By adopting the above technical solution, when the gas cylinder valve is opened, the high-pressure gas in the gas cylinder first passes through the pressure measuring block and then enters the pressure reducer. The high-pressure gas causes the pressure measuring block to move accordingly. Due to the presence of the return spring, the distance the pressure measuring block can move varies depending on the gas pressure. An end cylinder, a corresponding ejector block, and a reaction mechanism are set on the connection end of the pressure reducer with a small gas pressure capacity. This allows the pressure measuring block to move further under the action of the larger gas pressure when the gas cylinder pressure is greater than the pressure of the pressure reducer. This triggers the reaction mechanism, causing the ejector block to move so that the user can know that the gas cylinder pressure is too high and a lower-pressure gas cylinder needs to be replaced. This eliminates the need to manufacture the gas cylinder valve and the corresponding valve cylinder separately for two different situations, and also eliminates the need to install the gas cylinder valve separately for two different pressure gas cylinders, which is more convenient.

[0009] Optionally, the valve cylinder is formed with a pressure measuring channel and an airflow channel, both of which are connected to the gas cylinder valve. The airflow channel is connected to the pressure reducer, and one end of the pressure measuring block is located inside the pressure measuring channel.

[0010] By adopting the above technical solution, airflow channels and pressure measurement channels are set up respectively, so that the gas is not easily obstructed during the process of gas flowing from the valve cylinder to the connection end, and the gas can flow smoothly.

[0011] Optionally, an inner block is slidably connected within the pressure measuring channel along its length. The inner block abuts against the pressure measuring block, and both the inner block and the pressure measuring block have inclined surfaces at the abutting ends, allowing the inner block to push the pressure measuring block to move.

[0012] By adopting the above technical solution, all the gas entering the pressure measuring channel can drive the block inside the channel to move, making the block inside the channel easier to move, and thus the pressure measuring block can be moved more effectively, so as to better respond to different gas pressures by the different moving distances of the pressure measuring block.

[0013] Optionally, the reaction mechanism includes an abutment rod that can abut against the pressure measuring block exposed on the side of the valve cylinder and is slidably connected to the ejector block; an inner cylinder block that is fixedly connected to the end cylinder; an ejector limiting block that is fixedly connected to the abutment rod and can abut against the inner cylinder block on the side near the pressure measuring block; an abutment rod spring that is located on the ejector block and forces the abutment rod to move toward the pressure measuring block; and an ejector spring that is located on the inner cylinder block on the side away from the pressure measuring block and forces the ejector block away from the pressure measuring block.

[0014] By adopting the above technical solution, when the air pressure is high, the pressure measuring block pushes the abutment rod to move, so that the limiting ejection block moves synchronously, so that the limiting ejection block is no longer abutted by the block inside the cylinder. At this time, the ejection spring forces the ejection block to move, so as to inform the user that the gas cylinder pressure is too high.

[0015] Optionally, the ejection limiting block is inclined toward the pressure measuring block, and the inclined surface of the ejection limiting block can abut against the inner block of the cylinder to force the ejection limiting block to move and cause the abutment rod spring to be compressed.

[0016] By adopting the above technical solution, when the pop-out block needs to be reset after it pops out, it is only necessary to press the pop-out block into the end cylinder. There is no need to actively move the abutment rod to prevent the pop-out block from contacting the side of the inner block away from the pressure measuring block, so as to facilitate the reset of the pop-out block.

[0017] Optionally, the inner wall of the end cylinder is tightly fitted onto the outer wall of the connecting end, and the outer wall of the connecting end is fixedly connected to an end wall block that can be detachably connected to the end face of the end cylinder.

[0018] By adopting the above technical solution, the end tube can be disassembled from the connecting end, so that when the pressure reducer is damaged or the ejector block cannot be ejected smoothly, it can be disassembled and replaced separately.

[0019] Optionally, the connecting end is formed with an end step for the valve cylinder to be tightly fitted, and the valve cylinder end face is fixedly connected with a plug that can be inserted into the inner wall of the end step. The connecting end is provided with a plug positioning mechanism for fixing the position of the plug.

[0020] By adopting the above technical solution, the connecting end is inserted into the valve cylinder, so that the insert block is inserted into the end step, which can connect the connecting end and the valve cylinder, which is more convenient.

[0021] Optionally, the insertion block positioning mechanism includes a positioning block slidably connected inside the connecting end and inserted into the insertion block, a positioning block rod disposed on the positioning block and driving the positioning block to move and exposed outside the connecting end, and a positioning block spring disposed inside the connecting end and forcing the positioning block to be tightly inserted into the insertion block. The side of the positioning block abutting the end of the insertion block is inclined so that the positioning block can be pushed by the insertion block to move.

[0022] By adopting the above technical solution, the insert block can be directly inserted into the connection end, and then the positioning block spring can force the positioning block to be tightly inserted into the insert block, so as to make a stable and convenient connection between the connection end and the valve cylinder.

[0023] Optionally, the connecting end extends into the valve cylinder in the shape of a frustum, and the inner wall of the valve cylinder is fitted with the inclined surface of the frustum of the connecting end. Several sealing rings are coaxially provided on the inclined surface of the frustum of the connecting end.

[0024] By adopting the above technical solution, the connecting end can be conveniently inserted into the valve cylinder, and the setting of multiple sealing rings also makes it difficult for gas in the valve cylinder to leak out from the valve cylinder and the chamfered surface of the connecting end.

[0025] Optionally, a guide block is fixedly connected to the inner wall of the end step. The guide block is inserted into the valve cylinder along the insertion direction of the insert block, and the guide block is inserted into one end of the valve cylinder in an arc shape.

[0026] By adopting the above technical solution, before the insert block is inserted into the end step, the guide block must first be inserted into the valve cylinder so that the insert block can be smoothly aligned with the predetermined position for insertion, and also further prevents the connection end and the valve cylinder from rotating relative to each other.

[0027] In summary, this application includes at least one of the following beneficial effects:

[0028] 1. This makes it more convenient that the gas cylinder valve and the corresponding valve cylinder do not need to be manufactured separately for two different situations, nor that the gas cylinder valve needs to be installed separately for two different pressure gas cylinders;

[0029] 2. The connecting end is inserted into the valve cylinder, so that the insert block is inserted into the end step, which can connect the connecting end and the valve cylinder, which is quite convenient. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure in this application with the connecting end not inserted into the valve cylinder;

[0031] Figure 2 It is a cross-sectional structural diagram of the connecting end, valve cylinder, end wall block, end cylinder and outer wall block;

[0032] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0033] Figure 4 yes Figure 2 Enlarged view of section B in the middle.

[0034] Explanation of reference numerals in the attached drawings: 1. Connecting end; 2. Valve cylinder; 3. Pressure measuring block; 31. Sealing ring; 32. Guide block; 33. Outer wall block; 4. Return spring; 41. Abutment rod spring; 42. Pop-out spring; 43. End wall block; 44. Insert block; 45. End step; 46. Insert block positioning mechanism; 47. Positioning block; 48. Positioning block rod; 49. Positioning block spring; 5. End cylinder; 51. Pop-out block; 52. Reaction mechanism; 53. Pressure measuring channel; 54. Airflow channel; 55. Inner channel block; 56. Pressure measuring block rod; 57. Abutment rod; 58. Inner cylinder block; 59. Limit pop-out block. Detailed Implementation

[0035] The present application will be further described in detail below with reference to the accompanying drawings.

[0036] This application discloses a connection structure between a pressure reducer and a gas cylinder valve for an air respirator, referring to... Figure 1 The device includes a valve cylinder 2 that is fixedly connected to and communicates with the gas outlet of the gas cylinder valve. A connecting end 1 is installed at the end of the valve cylinder 2 away from the gas cylinder valve. The connecting end 1 is fixedly connected to and communicates with the air inlet of the pressure regulator at the end away from the valve cylinder 2. The end of the connecting end 1 facing the valve cylinder 2 is shaped like a frustum. There is also a corresponding frustum-shaped position on the inner wall of the valve cylinder 2. Several sealing rings 31 are coaxially embedded on the inclined surface of the frustum of the connecting end 1 along its own axis. The frustum-shaped end of the connecting end 1 extends into the valve cylinder 2, so that the sealing rings 31 are tightly pressed, so that the connecting end 1 and the valve cylinder 2 are tightly connected, so that the gas delivered by the gas cylinder valve can enter the pressure regulator through the valve cylinder 2 and the connecting end 1.

[0037] Reference Figure 2 The connecting end 1 has an end step 45 coaxially formed on the outer circumference of its frustum-shaped end. The valve cylinder 2 is tightly slidably connected to the inner circumference of the end step 45 along its own axis towards the inner circumference of the connecting end 1. The end face of the valve cylinder 2 can abut against the inner end face of the end step 45. A guide block 32 is fixedly connected to the inner circumference of the end step 45. The length direction of the guide block 32 is consistent with the axis direction of the connecting end 1. The end of the guide block 32 facing the valve cylinder 2 is arc-shaped. The guide block 32 is tightly inserted into the valve cylinder 2 along its own length direction, so that the circumferential positions of the connecting end 1 and the valve cylinder 2 are relatively aligned. Two insert blocks 44 are symmetrically fixedly connected to the end face of the valve cylinder 2 with its own axis as the center. The length direction of the insert block 44 is consistent with the axis direction of the valve cylinder 2. The insert block 44 is inserted into the inner wall of the end face of the end step 45 along its own length direction. The end of the insert block 44 inserted into the end step 45 is arc-shaped. The length of the insert block 44 is less than the length of the guide block 32, so that the guide block 32 is inserted into the valve cylinder 2 first, and then the insert block 44 is inserted into the inner wall of the end step 45.

[0038] Reference Figure 2 and Figure 3Inside the connecting end 1, at the positions where the two insert blocks 44 are inserted, there is an insert block positioning mechanism 46 for fixing the position of the insert blocks 44. The insert block positioning mechanism 46 includes a positioning block 47 that is radially slidably connected inside the connecting end 1. The end of the positioning block 47 near the insert block 44 is set with an inclined surface, and during the process of inserting the insert block 44 into the inner wall of the step 45 of the connecting end, the end of the insert block 44 can abut against the inclined surface of the positioning block 47, so that the positioning block 47 is away from the axis of the connecting end 1. A positioning block spring 49 is placed inside the connecting end 1. The two ends of the positioning block spring 49 abut against the positioning block 47 and the inner wall of the connecting end 1, respectively, so that the positioning block 47 can be tightly inserted into the surface of the insert block 44 away from the axis of the connecting end 1. The positioning block 47 is fixedly connected to a positioning block rod 48 that is inserted into the positioning block spring 49 at the end away from the positioning block 44. The end of the positioning block rod 48 away from the positioning block 47 passes through the positioning block 47 along the moving direction and is exposed on the outer circumference of the connecting end 1. This allows the positioning block rod 48 to be pulled outward when it is necessary to separate the connecting end 1 and the valve cylinder 2, so that the positioning block 47 is disengaged from the insertion block 44 and the connecting end 1 and the valve cylinder 2 can move away from each other.

[0039] Reference Figure 2 The inner diameter of the valve cylinder 2 at the end furthest from the connecting end 1 is much smaller than the inner diameter of the valve cylinder 2 at the end closest to the connecting end 1. The end of the valve cylinder 2 with the smaller inner diameter is the airflow channel 54. A corresponding channel is opened at the center of the end face of the connecting end 1 and is aligned and connected to the airflow channel 54. A pressure measuring channel 53 connected to the airflow channel 54 is formed inside the valve cylinder 2. The length direction of the pressure measuring channel 53 connected to the end of the airflow channel 54 is inclined. The end of the inclined section of the pressure measuring channel 53 furthest from the airflow channel 54 is close to the connecting end 1. The length direction of the end of the pressure measuring channel 53 furthest from the airflow channel 54 is consistent with the axial direction of the valve cylinder 2. An inner block 55 is tightly slidably connected to the inner wall of the pressure measuring channel 53 furthest from the airflow channel 54 along its own length direction. The inner block 55 cannot pass through the turning point of the pressure measuring channel 53 to enter the inclined section of the pressure measuring channel 53. In order to install the inner block 55, the valve cylinder 2 can initially be divided into two parts at the part of the pressure measuring channel 53 where the inner block 55 is placed. After the inner block 55 is placed into the corresponding pressure measuring channel 53, the two parts of the valve cylinder 2 are welded together to form a complete valve cylinder 2.

[0040] Reference Figure 2Inside the valve cylinder 2, a pressure measuring block 3 is slidably connected radially. The end of the pressure measuring block 3 enters the end of the pressure measuring channel 53 away from the airflow channel 54. The end of the inner block 55 away from the turning point of the pressure measuring channel 53 abuts against the end of the pressure measuring block 3. Corresponding sealing rings 31 are provided on the peripheral sides of both the pressure measuring block 3 and the inner block 55 to prevent gas from easily flowing out of the pressure measuring channel 53. The side of the inner block 55 that abuts against the pressure measuring block 3 is inclined, so that the pressure measuring block 3 can be pushed to move when the inner block 55 is subjected to high-pressure gas. A return spring 4 is placed inside the valve cylinder 2. The two ends of the return spring 4 abut against the end of the pressure measuring block 3 away from the inner block 55 and the inner wall of the valve cylinder 2, respectively, so that the pressure measuring block 3 has a tendency to move towards the pressure measuring channel 53, and also so that the moving distance of the pressure measuring block 3 is different when the gas of different pressure pushes the inner block 55 to move. The pressure measuring block 3 abuts against the reset spring 4 and has an integrally formed pressure measuring block rod 56 at one end. The pressure measuring block rod 56 passes through the pressure measuring block 3 along the moving direction and is exposed in the valve cylinder 2.

[0041] Reference Figure 2 and Figure 4 Since pressure regulators suitable for high-pressure applications can also be used with low-pressure applications, the following structure is only implemented on the connection end 1 of the pressure regulator suitable for low-pressure applications. An end wall block 43 is coaxially fixedly connected to the outer circumference of the connection end 1. The end wall block 43 is located on the side of the connection end 1 exposed by the positioning block rod 48 facing the valve cylinder 2. The side of the end wall block 43 facing away from the positioning block rod 48 abuts against the end cylinder 5. The inner circumference of the end cylinder 5 is coaxially and tightly fitted onto the outer circumference of the connection end 1. The end face of the end cylinder 5 abuts against the end wall block 43 and is detachably connected by screws. The end cylinder 5 is fitted onto the valve cylinder 2 and does not abut against the pressure measuring block rod 56. The outer wall of the end cylinder 5 is integrally formed with an outer wall block 33. One end of the outer wall block 33 is close to the exposed end of the valve cylinder 2 of the pressure measuring block rod 56. The length direction of the outer wall block 33 is consistent with the axis direction of the end cylinder 5. The outer wall block 33 is provided with a reaction mechanism 52 that can cause the ejector block 51 to move when the pressure measuring block 3 moves to its maximum distance under the action of airflow.

[0042] Reference Figure 4The reaction mechanism 52 includes a pop-out block 51 that is slidably connected to the inside of the outer wall block 33 along the length of the outer wall block 33. The end of the pop-out block 51 away from the pressure measuring rod 56 can be exposed outside the outer wall block 33. The end of the pop-out block 51 513 facing the pressure measuring rod 56 is slidably connected to an abutment rod 57. The abutment rod 57 moves along the moving direction of the pressure measuring rod 56. The cross-section of the abutment rod 57 located in the pop-out block 51 is T-shaped, so that the abutment rod 57 moves stably. An abutment rod spring 41 is fixedly connected inside the pop-out block 51. The end of the abutment rod spring 41 is fixedly connected to the surface of the abutment rod 57 away from the axis of the valve cylinder 2. The abutment rod spring 41 causes the abutment rod 57 to move toward the axis of the valve cylinder 2. A limiting ejection block 59 is fixedly connected to the side of the abutment rod 57 away from the abutment rod spring 41. An inner block 58 is fixedly connected inside the outer wall block 33. One end face of the ejection block 51 connected to the abutment rod 57 can abut against the side of the inner block 58 away from the pressure measuring block rod 56. The side of the limiting ejection block 59 facing the ejection block 51 can abut against the side of the inner block 58 away from the ejection block 51. Two ejection springs 42 are fixedly connected between the adjacent sides of the inner block 58 and the ejection block 51. The ejection springs 42 force the end of the ejection block 51 away from the abutment rod 57 to protrude from the outer wall block 33.

[0043] Reference Figure 4 The end of the abutment rod 57 away from the ejector block 51 is directly opposite the pressure measuring rod 56. When the gas cylinder pressure is low, there is a slight gap between the pressure measuring rod 56 and the abutment rod 57, or they just touch. When the gas cylinder pressure is high, the pressure measuring rod 56 can push the abutment rod 57 to move, causing the abutment rod spring 41 to compress until the ejector block 51 is no longer restricted by the inner block 58. At this time, the ejector spring 42 extends, forcing the ejector block 51 to protrude from the outer wall block 33. The ejector spring 42 and the abutment rod 57 are not on the same straight line, so that when the ejector block 51 is protruding from the outer wall block 33, neither the abutment rod 57 nor the ejector block 59 will touch the ejector spring 42. The side of the ejector block 59 facing away from the ejector block 51 is inclined, so that when it is necessary to reset the ejector block 59 and press it back into the outer wall block 33, the inclined surface of the ejector block 59 can abut against the inner block 58, allowing the ejector block 59 to move smoothly through the inner block 58.

[0044] The principle of the connection structure between the pressure reducer and the cylinder valve of an air respirator according to an embodiment of this application is as follows: During connection, the frustum-shaped end of the connecting end 1 is inserted into the valve cylinder 2, and the guide block 32 is correspondingly inserted into the valve cylinder 2, so that the two insert blocks 44 are inserted into the corresponding end steps 45 until the end face of the valve cylinder 2 abuts against the end wall block 43. At this time, the positioning block 47 is inserted into the side of the insert block 44, making it difficult for the insert block 44 to detach from the end step 45, thus completing the tight connection between the connecting end 1 and the valve cylinder 2.

[0045] After connection, the cylinder valve opens, allowing high-pressure gas to enter the gas flow channel 54. Then, some gas also enters the pressure measuring channel 53, pushing the inner block 55 and the pressure measuring block 3. This compresses the return spring 4, causing the pressure measuring block rod 56 to move toward the abutment rod 57. If the cylinder pressure is too high, the abutment rod 57 will be pushed, preventing the ejection block 59 from being blocked by the inner block 58. At this time, the ejection block 51 can be forced to move under the action of the ejection spring 42, allowing it to protrude from the outer wall block 33, so that the user knows that the pressure reducer with low pressure is connected to the cylinder with high pressure.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A connection structure between a pressure reducer and a cylinder valve for an air respirator, comprising a connection end (1) fixedly connected to the pressure reducer, and a valve cylinder (2) fixedly connected to the cylinder valve and detachably connected to the connection end (1) so that the pressure reducer is connected to the cylinder valve, characterized in that: The valve cylinder (2) is slidably connected to a pressure measuring block (3) that can be moved accordingly by the gas sent out by the gas cylinder valve. The valve cylinder (2) is provided with a reset spring (4) that can force the pressure measuring block (3) to reset when the gas cylinder valve is closed and control the movement distance of the pressure measuring block (3) under different pressure airflows. The connecting end (1) is provided with an end cylinder (5) sleeved on the valve cylinder (2). The end cylinder (5) is slidably connected to a pop-out block (51). The end cylinder (5) is provided with a reaction mechanism (52) that can make the pop-out block (51) move when the pressure measuring block (3) moves the maximum distance under the action of airflow. The reaction mechanism ( 52) Includes an abutting rod (57) that can abut against the pressure measuring block (3) exposed on the side of the valve cylinder (2) and slidably connected to the ejector block (51), a cylinder block (58) fixedly connected to the end cylinder (5), a limiting ejector block (59) fixedly connected to the abutting rod (57) and able to abut against the cylinder block (58) on the side close to the pressure measuring block (3), an abutting rod spring (41) provided on the ejector block (51) and forcing the abutting rod (57) to move toward the pressure measuring block (3), and an ejector spring (42) provided on the side of the cylinder block (58) away from the pressure measuring block (3) and forcing the ejector block (51) away from the pressure measuring block (3).

2. The connection structure between the pressure reducer and the cylinder valve for an air respirator according to claim 1, characterized in that: The valve cylinder (2) has a pressure measuring channel (53) and an airflow channel (54) formed inside. Both the airflow channel (54) and the pressure measuring channel (53) are connected to the gas cylinder valve. The airflow channel (54) is connected to the pressure reducer. One end of the pressure measuring block (3) is located inside the pressure measuring channel (53).

3. The connection structure between the pressure reducer and the cylinder valve for an air respirator according to claim 2, characterized in that: The pressure measuring channel (53) has an inner block (55) that slides along its length. The inner block (55) abuts against the pressure measuring block (3). The inner block (55) and the pressure measuring block (3) are both set at an inclined surface so that the inner block (55) can push the pressure measuring block (3) to move.

4. The connection structure between the pressure reducer and the cylinder valve for an air respirator according to claim 1, characterized in that: The ejection limiting block (59) is inclined toward the pressure measuring block (3), and the inclined surface of the ejection limiting block (59) can abut against the inner block (58) to force the ejection limiting block (59) to move and compress the abutment rod spring (41).

5. The connection structure between the pressure reducer and the cylinder valve for an air respirator according to claim 1, characterized in that: The inner wall of the end cylinder (5) is tightly fitted onto the outer wall of the connecting end (1), and the outer wall of the connecting end (1) is fixedly connected to an end wall block (43) that can be detachably connected to the end face of the end cylinder (5).

6. The connection structure between the pressure reducer and the cylinder valve for an air respirator according to claim 2, characterized in that: The connecting end (1) is formed with an end step (45) for the valve cylinder (2) to be tightly fitted. The end face of the valve cylinder (2) is fixedly connected with a plug (44) that can be inserted into the inner wall of the end step (45). The connecting end (1) is provided with a plug positioning mechanism (46) for fixing the position of the plug (44).

7. The connection structure between the pressure reducer and the cylinder valve for an air respirator according to claim 6, characterized in that: The positioning mechanism (46) includes a positioning block (47) slidably connected inside the connecting end (1) and inserted into the insertion block (44), a positioning block rod (48) located on the positioning block (47) and driving the positioning block (47) to move and exposed outside the connecting end (1), and a positioning block spring (49) located inside the connecting end (1) and forcing the positioning block (47) to be tightly inserted into the insertion block (44). The side of the positioning block (47) abutting against the end of the insertion block (44) is inclined so that the positioning block (47) can be pushed by the insertion block (44) to move.

8. The connection structure between the pressure reducer and the cylinder valve for an air respirator according to claim 6, characterized in that: The connecting end (1) extends into the valve cylinder (2) and is truncated. The inner wall of the valve cylinder (2) is attached to the truncated inclined surface of the connecting end (1). Several sealing rings (31) are coaxially provided on the truncated inclined surface of the connecting end (1).

9. The connection structure between the pressure reducer and the cylinder valve for an air respirator according to claim 6, characterized in that: The inner wall of the end step (45) is fixedly connected to a guide block (32), which is inserted into the valve cylinder (2) along the insertion direction of the insert block (44). The guide block (32) is inserted into the valve cylinder (2) at one end in an arc shape.

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