Quick connector for positive pressure head top air filtration unit

Abstract

The application relates to a quick pipe joint of a positive pressure head-mounted filtering air supply device and belongs to the technical field of air supply filtering equipment. The quick pipe joint of the positive pressure head-mounted filtering air supply device comprises a connecting elbow, a lock tongue sleeve, a lock tongue ring, lock tongues and a lock pipe sleeve; the upper end of the lock pipe sleeve is threadedly connected with the lock tongue sleeve; the lock tongue sleeve on the upper end of the lock pipe sleeve is sleeved with the lock tongue ring; two groups of lock tongues are symmetrically clamped on the lock tongue sleeve in the lock tongue ring; the connecting elbow is inserted and assembled on the upper end of the lock tongue sleeve; and the lock tongues are intermittently clamped and connected with the connecting elbow. The quick pipe joint of the positive pressure head-mounted filtering air supply device is compact in structure and ingenious in design; when assembled, the connecting elbow is inserted and connected to the lock tongue sleeve, the lock tongue ring is screwed, and the assembly is completed; the operation is simple, and the assembly time can be greatly shortened. In addition, after the pipe joint is assembled, the lock tongues can be automatically locked under the action of elasticity, so that the problem of the large safety hidden danger caused by the easy loosening of the existing pipe joint is avoided.

Description

Technical Field

[0001] This invention relates to a quick-connect fitting for a positive pressure head-mounted filter air supply device, belonging to the technical field of air supply and filtration equipment. Background Technology

[0002] In specialized fields such as firefighting and underground construction, workers are often equipped with head-mounted air filtration devices to filter out toxic substances from the air before breathing, thus preventing poisoning.

[0003] A typical head-mounted filtration and air supply device includes a breathing head, an air supply duct, a connector, and a filter. The upper end of the air supply duct connects to the breathing head via a connector, and the lower end connects to the filter. Existing connectors usually use threaded connections, which require multiple twists, resulting in complex and time-consuming operation. Furthermore, existing threaded connectors lack a locking mechanism, making them prone to loosening, leaks, and even detachment, posing significant safety hazards. Therefore, it is necessary to develop a specialized connector to address these problems with existing head-mounted filtration and air supply device connectors. Summary of the Invention

[0004] The purpose of this invention is to provide a quick-connect pipe joint for a positive pressure head-mounted filter air supply device that is compact in structure and ingenious in design, thereby solving the problems of complex operating procedures and significant safety hazards associated with existing pipe joints.

[0005] The technical solution of this invention is:

[0006] A quick-connect fitting for a positive pressure head-mounted filter air supply device includes a connecting elbow, a locking tongue sleeve, a locking tongue ring, a locking tongue, and a locking tube sleeve. The locking tube sleeve is characterized by: a locking tongue sleeve threaded to its upper end; a locking tongue ring fitted onto the locking tongue sleeve at the upper end of the locking tube sleeve; two sets of locking tongues symmetrically fitted onto the locking tongue sleeve inside the locking tongue ring; a connecting elbow inserted into the upper end of the locking tongue sleeve; and intermittent locking connections between the locking tongue and the connecting elbow.

[0007] The locking sleeve has internal threads.

[0008] The locking tongue sleeve has a "stepped structure"; the thin section of the locking tongue sleeve has an external thread on its circumferential surface; the locking tongue sleeve port below the external thread has a "conical" pressing edge; the thick section of the locking tongue sleeve has a positioning ring ridge on its circumferential surface; symmetrical locking through holes are provided on the circumferential surface of the locking tongue sleeve on one side of the positioning ring ridge; positioning grooves are provided on the locking tongue sleeve on both sides of the locking through holes.

[0009] The inner wall of the locking tongue ring is symmetrically provided with two sets of avoidance concave surfaces; the avoidance concave surfaces are connected to each other by extrusion surfaces; the avoidance concave surfaces and the extrusion surfaces are connected by a rounded transition.

[0010] The locking tongue has an integrated structure, which includes a snap-fit ​​body, an elastic plate, and a positioning rod; the snap-fit ​​body has elastic plates symmetrically arranged at both ends; the elastic plate has a positioning rod at its end; and the snap-fit ​​body and the elastic plate form an arc-shaped structure.

[0011] A positioning ring plate is provided on the circumferential surface of the connecting elbow; two sets of sealing ring ridges are provided at intervals on the circumferential surface of the connecting elbow on one side of the positioning ring plate; two sets of slots are symmetrically provided between the sealing ring ridges through partition ridges.

[0012] The advantages of this invention are:

[0013] This positive pressure head-mounted filter air supply device features a quick-connect pipe joint with a compact and ingenious design. Assembly is simple: just insert the connecting elbow into the locking tongue sleeve and tighten the locking tongue ring. This minimalist operation significantly reduces assembly time. Furthermore, once assembled, the locking tongue automatically locks under elastic force, avoiding the safety hazards associated with loosening common in existing pipe joints. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the exploded structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the connecting elbow of the present invention;

[0016] Figure 3 This is a schematic diagram of the locking tongue sleeve of the present invention;

[0017] Figure 4 This is a schematic diagram of the locking tongue ring of the present invention;

[0018] Figure 5 This is a cross-sectional structural diagram of the locking tongue ring of the present invention;

[0019] Figure 6 This is a schematic diagram of the locking tongue of the present invention;

[0020] Figure 7 This is a schematic diagram of the assembled structure of the present invention;

[0021] Figure 8 for Figure 7 Schematic diagram of the structure in the AA direction;

[0022] Figure 9 for Figure 8 Enlarged structural diagram at point C;

[0023] Figure 10 for Figure 7 A schematic diagram of the structure when the middle BB direction is in the locked state;

[0024] Figure 11 for Figure 7 A schematic diagram of the structure when the BB direction is in the loosened state.

[0025] In the diagram: 1. Locking sleeve; 2. Locking tongue sleeve; 3. Locking tongue ring; 4. Locking tongue; 5. Connecting elbow; 6. External thread; 7. Pressing edge; 8. Positioning ring ridge; 9. Snap-fit ​​through hole; 10. Positioning groove; 11. Avoidance concave surface; 12. Extrusion surface; 13. Snap-fit ​​body; 14. Elastic plate; 15. Positioning rod; 16. Positioning ring plate; 17. Sealing ring ridge; 18. Snap-fit ​​groove; 19. Air supply pipe; 20. Partition ridge. Detailed Implementation

[0026] The quick-connect fitting for this positive pressure head-mounted filter air supply device includes a connecting elbow 5, a locking tongue sleeve 2, a locking tongue ring 3, a locking tongue 4, and a locking sleeve 1 (see the instruction manual appendix). Figure 1 ).

[0027] Lock sleeve 1 has internal threads (see instruction manual appendix). Figure 1 The air supply pipe 19 of the head-mounted filter air supply device is a corrugated pipe or a regular hose; when the air supply pipe 19 is a corrugated pipe, it can be threadedly connected to the locking sleeve 1; when the air supply pipe 19 is a regular hose, one end of it can be inserted into the inside of the locking sleeve 1.

[0028] The upper end of the locking sleeve 1 is threadedly connected to the locking tongue sleeve 2 (see the instruction manual appendix). Figure 1 , 7 (and 8). The locking tongue sleeve 2 has a "stepped structure"; the circumferential surface of the thin section of the locking tongue sleeve 2 is provided with external threads 6 (see the instruction manual appendix). Figure 3 During assembly, the locking tongue sleeve 2 can maintain a threaded connection with the locking tube sleeve 1 through the external thread 6.

[0029] The locking tongue sleeve 2 port below the external thread 6 is provided with a tapered clamping edge 7 (see instruction manual appendix). Figure 3 The purpose of setting the clamping edge 7 is to allow the clamping edge 7 of the locking tongue sleeve 2 to be inserted into the interior of one end of the air supply pipe 19 during assembly. When the locking tongue sleeve 2 is tightened, the clamping edge 7, in cooperation with the locking sleeve 1, can clamp and fix the air supply pipe 19 (see the instruction manual appendix). Figure 9 ).

[0030] A positioning ring ridge 8 is provided on the circumferential surface of the thick section of the latch sleeve 2; symmetrical locking holes 9 are provided on the circumferential surface of the latch sleeve 2 on one side of the positioning ring ridge 8; positioning grooves 10 are provided on the latch sleeve 2 on both sides of the locking holes 9 (see the instruction manual appendix). Figure 3 ).

[0031] The latch sleeve 2 is fitted with a latch 4 via a snap-fit ​​hole 9 and a positioning groove 10 (see instruction manual appendix). Figure 10 The locking tongue 4 is a one-piece structure, comprising a locking body 13, an elastic plate 14, and a positioning rod 15; the locking body 13 has elastic plates 14 symmetrically arranged at both ends; the elastic plate 14 has a positioning rod 15 at its end; the locking body 13 and the elastic plate 14 form an arc-shaped structure (see the instruction manual appendix). Figure 6 ).

[0032] The positioning rod 15 of the locking tongue 4 is slidably connected to the positioning groove 10; when the locking tongue 4 is pressed, under the constraint of the positioning groove 10, the locking tongue 4, after overcoming the elastic force of the elastic plate 14, moves inward through the locking through hole 9 (see the instruction manual appendix). Figure 10 ).

[0033] A latch ring 3 is fitted onto the latch sleeve 2 at the upper end of the latch sleeve 1 (see instruction manual appendix). Figure 7 Under the action of the end face of the locking sleeve 1 and the positioning ring 8, the locking tongue ring 3 can only rotate and cannot undergo other displacement movements, thus avoiding the problem of the locking tongue ring 3 disengaging from the working position.

[0034] The inner wall of the locking tongue ring 3 is symmetrically provided with two sets of clearance concave surfaces 11; the clearance concave surfaces 11 are connected to each other by the pressing surface 12; the clearance concave surfaces 11 and the pressing surface 12 are connected by an arc transition (see the instruction manual). Figure 5 The purpose of setting the locking tongue ring 3 in this way is to allow the locking tongue 4 to be squeezed and deformed by the squeezing surface 12 during operation.

[0035] The upper end of the locking tongue sleeve 2 is fitted with a connecting elbow 5 (see instruction manual). Figure 1 and 7 ); The upper end of the connecting elbow 5 is connected to the breathing headgear of the head-mounted filter air supply device.

[0036] A positioning ring plate 16 is provided on the circumferential surface of the connecting elbow 5 (see the instruction manual). Figure 2 During assembly, when the connecting elbow 5 is inserted into the locking tongue sleeve 2, the positioning ring plate 16 can limit the insertion position of the connecting elbow 5, thereby avoiding the problem of inaccurate insertion position during assembly.

[0037] Two sets of sealing ring ribs 17 are spaced apart on the circumferential surface of the connecting elbow 5 on one side of the positioning ring plate 16 (see the instruction manual appendix). Figure 2 When the connecting elbow 5 is inserted into the locking tongue sleeve 2, the sealing ring 17 can be sealed to the inner wall of the locking tongue sleeve 2. In this way, the problem of leakage caused by gaps between the connecting elbow 5 and the locking tongue sleeve 2 during operation can be solved.

[0038] Two sets of slots 18 are symmetrically arranged between the sealing ring ridges 17 and the partition ridges 20 (see the instruction manual). Figure 2 The purpose of setting the slot 18 is to allow the locking tongue 4 to deform during assembly, so that the locking body 13 can be inserted into the slot 18 after passing through the locking hole 9 on the locking tongue sleeve 2, thereby achieving the purpose of keeping the connecting elbow 5 fixedly connected to the locking tongue sleeve 2 through the locking tongue 4.

[0039] The upper end of the connecting elbow 5 of the quick-connect fitting of the positive pressure head-mounted filter air supply device is fixed to and connected to the breathing head cover of the head-mounted filter air supply device. The locking sleeve 1, locking tongue sleeve 2, and locking tongue ring 3 are installed at one end of the air supply pipe 19.

[0040] When using this connector to connect the breathing headgear of the head-mounted filter air supply device and the air supply pipe 19, insert the lower end of the connecting elbow 5 into the locking tongue sleeve 2, then rotate the locking tongue ring 3 to press the locking tongue 4 through the compression surface 12. This allows the locking tongue 4's snap-fit ​​body 13 to pass through the snap-fit ​​through hole 9 on the locking tongue sleeve 2 and be inserted into the slot 18, thus achieving the purpose of keeping the connecting elbow 5 fixedly connected to the locking tongue sleeve 2 through the locking tongue 4. The connector is then assembled and connected.

[0041] When it is necessary to loosen the pipe fitting, rotate the locking tongue ring 3 so that the clearance concave surface 11 corresponds to the locking tongue 4. At this time, the locking tongue 4 will reset under its own elastic force. After the locking tongue 4 resets, it will disengage from the connecting elbow 5. Then, pull the connecting elbow 5 out of the inside of the locking tongue sleeve 2 to complete the loosening action of the pipe fitting.

[0042] This quick-connect pipe joint for the positive pressure head-mounted filtration air supply device features a compact structure and ingenious design. Assembly is simple: just insert the connecting elbow 5 onto the locking tongue sleeve 2 and tighten the locking tongue ring 3. This operation greatly reduces assembly time. Furthermore, after assembly, the locking tongue 4 automatically locks under the action of its elasticity, avoiding the safety hazards caused by loosening common in existing pipe joints. This design makes it particularly suitable for the needs of head-mounted filtration air supply devices.

Claims

1. A quick pipe joint of a positive pressure head-mounted filtering air supply device, comprising a connecting elbow (5), a lock tongue sleeve (2), a lock tongue ring (3), a lock tongue (4) and a lock pipe sleeve (1), characterized in that: The upper end of the lock pipe sleeve (1) is threadedly connected with a lock tongue sleeve (2); the lock tongue sleeve (2) at the upper end of the lock pipe sleeve (1) is sleeved with a lock tongue ring (3); two groups of lock tongues (4) are symmetrically clamped on the lock tongue sleeve (2) inside the lock tongue ring (3); a connecting elbow (5) is inserted on the upper end of the lock tongue sleeve (2); the lock tongue (4) and the connecting elbow (5) are intermittently clamped and connected; the lock pipe sleeve (1) is internally provided with an internal thread; The lock tongue sleeve (2) is in a "stepped structure"; an external thread (6) is arranged on the circumferential surface of the thin section of the lock tongue sleeve (2); a "conical" compression lip (7) is arranged on the port of the lock tongue sleeve (2) below the external thread (6); a positioning ring rib (8) is arranged on the circumferential surface of the thick section of the lock tongue sleeve (2); a clamping through hole (9) is symmetrically arranged on the circumferential surface of the lock tongue sleeve (2) on one side of the positioning ring rib (8); a positioning recess (10) is arranged on the lock tongue sleeve (2) on both sides of the clamping through hole (9); The lock tongue ring (3) is symmetrically provided with two groups of avoidance concaves (11) on the inner wall; the avoidance concaves (11) are connected with each other through extrusion surfaces (12); the avoidance concaves (11) and the extrusion surfaces (12) are connected in a circular arc transition mode; The lock tongue (4) is in an integral structure, which comprises a clamping body (13), an elastic plate (14) and a positioning rod (15); the elastic plates (14) are symmetrically arranged at both ends of the clamping body (13); the positioning rod (15) is arranged at the end of the elastic plate (14); the clamping body (13) and the elastic plate (14) form an arc structure.

2. The quick connector for a positive pressure head top air filtration and delivery device of claim 1, wherein: The circumferential surface of the connecting elbow (5) is provided with a positioning ring plate (16); two groups of sealing ring ribs (17) are symmetrically arranged on the circumferential surface of the connecting elbow (5) on one side of the positioning ring plate (16); two groups of clamping grooves (18) are symmetrically arranged between the sealing ring ribs (17) through a partition rib (20).

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