Rotary connector of liquefied gas flame gun

Abstract

The utility model belongs to the technical field of liquefied gas spray guns, and relates to a rotary connector of a liquefied gas flame gun, which comprises a first pipe fitting on the connector side and a second pipe fitting on the handle shell side. A sealing structure, an axial limiting structure and a rotary supporting structure are arranged between the first pipe fitting and the second pipe fitting; the sealing structure comprises a sealing ring for sealing the outer wall of the first pipe fitting and the inner wall of the second pipe fitting; the axial limiting structure comprises a first limiting groove formed in the outer wall of the first pipe fitting and a second limiting groove formed in the inner wall of the second pipe fitting, and the first limiting groove and the second limiting groove are oppositely arranged and jointly provided with a plurality of limiting balls in an embedded mode. The rotary support structure includes a bearing. The rotary connector of the liquefied gas spray gun has the advantages of being simple in structure, easy to assemble, good in sealing performance, flexible in rotation and long in service life.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of liquefied gas spray gun, relate to a liquefied gas spray fire gun rotary connector. BACKGROUND

[0002] Liquefied gas spray fire gun is the heating tool with liquefied gas as fuel, and correct use can reach 1300 DEG of high temperature, has the advantages of low cost, safe and convenient, pollution-free, stable performance. It is widely used in the occasion needing flame or heating. In order to reduce the restriction of handle using angle, and reduce the torsion of liquefied gas supply hose, some liquefied gas spray fire guns adopt rotatable handle structure.

[0003] Chinese utility model patent CN219473642U (announcement date 2023.08.04) discloses a handle of liquefied gas spray gun, the handle includes handle shell and the metal connecting pipe inserted in the handle shell, the handle further includes: joint, including the rotating part inserted in the handle shell and the connecting part for connecting the liquefied gas supply hose, the rotating part extends along the first axis, the connecting part extends along the second axis, the included angle between the first axis and the second axis is greater than 0 and less than 180 degrees;The outer connecting sleeve is arranged in the handle shell and has opposite distal end and proximal end, the proximal end of the metal connecting pipe is fixedly connected to the distal end of the outer connecting sleeve, and the rotating part is rotatably connected to the proximal end of the outer connecting sleeve about the first axis;Wherein, the lumen of the metal connecting pipe and the inner cavity of the joint are communicated with each other. In addition, the hollow shaft is arranged in the outer connecting sleeve, one end of the hollow shaft is inserted into the proximal end of the metal connecting pipe and is sealed by the sealing ring, and the other end of the hollow shaft is rotatably inserted into the rotating part and is sealed by the sealing ring.

[0004] The handle of the above-mentioned liquefied gas spray gun realizes rotatable connection, but has many deficiencies: ①the structure is complex, and the outer connecting sleeve for connection is arranged in the handle shell, so assembly is inconvenient. ②the rotating structure is composed of joint (rotating part), outer connecting sleeve and hollow shaft, and the machining precision and assembly precision are very high, and the coaxiality is difficult to guarantee. ③the joint and the outer connecting sleeve are supported by the shaft sleeve, and the shaft sleeve is easy to deform after long-time use, causing the handle to shake and being difficult to maintain and replace. UTILITY MODEL CONTENTS

[0005] The utility model provides a liquefied gas spray fire gun rotary connector in view of the deficiency of prior art, has simple structure, easy assembly, good sealing, flexible rotation and long service life.

[0006] To solve the above technical problems, the purpose of the utility model is realized by the following technical scheme:

[0007] A liquefied gas spray gun rotary connector, comprising a first pipe on the connector side and a second pipe on the handle shell side, the first pipe is rotatably inserted into the second pipe, and a sealing structure, an axial limiting structure and a rotary bearing structure are arranged between the first pipe and the second pipe.

[0008] The sealing structure comprises a sealing ring that seals the outer wall of the first pipe and the inner wall of the second pipe.

[0009] The axial limiting structure comprises a first limiting groove arranged on the outer wall of the first pipe and a second limiting groove arranged on the inner wall of the second pipe, the first limiting groove and the second limiting groove are oppositely arranged and jointly embedded with a plurality of limiting balls.

[0010] The rotary bearing structure comprises a bearing.

[0011] In the above-mentioned liquefied gas spray gun rotary connector, the sealing structure, the axial limiting structure and the rotary bearing structure are sequentially arranged from the handle shell to the connector.

[0012] In the above-mentioned liquefied gas spray gun rotary connector, the outer wall of the first pipe is provided with one or more annular sealing grooves, and the annular sealing grooves are respectively sleeved with sealing rings, and the sealing rings are in contact with the inner wall of the second pipe and are sealed; preferably, the annular sealing grooves are provided with two or more corresponding sealing rings.

[0013] In the above-mentioned liquefied gas spray gun rotary connector, the first limiting groove and the second limiting groove have the same groove depth, and the groove depth is half of the diameter of the limiting ball.

[0014] In the above-mentioned liquefied gas spray gun rotary connector, the second pipe is provided with a ball mounting hole in communication with the second limiting groove, the diameter of the ball mounting hole is greater than the diameter of the limiting ball, the ball mounting hole is embedded with a locking ball, the diameter of the locking ball is greater than the diameter of the limiting ball and is in interference fit with the ball mounting hole; preferably, the ball mounting hole is arranged along the radial direction of the second pipe; preferably, the ball mounting hole is arranged at the same axial position as the limiting groove; the locking ball can also be replaced by a plug and the like.

[0015] In the above-mentioned liquefied gas spray gun rotary connector, the first pipe is provided with a first outer periphery, a second outer periphery and a third outer periphery with increasing radial dimensions in sequence, and a stepped structure is formed between the first outer periphery and the second outer periphery and between the second outer periphery and the third outer periphery; the second pipe is sleeved on the first outer periphery and the second outer periphery of the first pipe and is provided with a first inner periphery and a second inner periphery matched therewith, and a stepped structure is formed between the first inner periphery and the second inner periphery.

[0016] In the rotating connector of the liquefied gas spray gun, the annular sealing groove is arranged on the first outer circumferential surface, the first limiting groove is arranged on the second outer circumferential surface, and the second limiting groove is arranged on the second inner circumferential surface; the bearing mounting step is formed between the second outer circumferential surface and the third outer circumferential surface, and the bearing mounting groove is arranged at the outer end of the second inner circumferential surface; and the bearing is arranged between the bearing mounting step and the bearing mounting groove.

[0017] In the rotating connector of the liquefied gas spray gun, the connector is detachably connected with the first pipe, and the axis of the connector and the axis of the first pipe form an angle; preferably, the connector is screw-fixed with the first pipe.

[0018] Alternatively, in the rotating connector of the liquefied gas spray gun, the connector is integrally formed with the first pipe, and the axis of the connector is coaxially arranged with the axis of the first pipe.

[0019] In the rotating connector of the liquefied gas spray gun, the handle shell is detachably connected with the second pipe, an outer threaded interface is arranged at the end of the handle shell close to the connector, an inner threaded interface is arranged at the end of the second pipe away from the connector, and the outer threaded interface and the inner threaded structure are screw-fixed.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. The utility model provides a rotating connector of liquefied gas spray gun, through setting up sealing structure, axial limit structure, rotating support structure connection connector side's first pipe and handle shell side's second pipe, form sealed, axial fixed and can relative rotation handle structure, have simple structure, easy to assemble, good sealing, flexible and long service life's advantage.

[0022] 2. The utility model forms sealing structure through sealing ring to obtain better sealing effect, obtains stable, firm and rotatable axial limit structure through the cooperation of limiting groove and limiting ball, obtains stable and flexible rotating support structure through the support of bearing, and also will not be deformed when long -term use, can further provide the service life of rotating handle.

[0023] 3. The utility model discloses that the first pipe and the second pipe form the assembly and can be directly connected on the outer threaded interface of handle shell, and the utility model discloses convenient assembly and replacement.In addition, the utility model discloses can also be adapted to various different models of liquefied gas spray gun through changing the thread model. ACCURACY

[0024] Figure 1 It is the perspective view of the utility model embodiment 1;

[0025] Figure 2 It isFigure 1 axial sectional view of the connection head of the first embodiment of the utility model;

[0026] Figure 3 Figure 1 explosion view of the connection head of the first embodiment of the utility model;

[0027] Figure 4 is the perspective view of the connection head of the first embodiment of the utility model;

[0028] Figure 5 is the perspective view of the second pipe fitting of the first embodiment of the utility model;

[0029] Figure 6 is the perspective view of the second embodiment of the utility model;

[0030] Figure 7 axial sectional view of the connection head of the second embodiment of the utility model; Figure 6

[0031] Reference numerals: 1, connection head; 2, first pipe fitting; 21, first limiting groove; 22, annular sealing groove; 23, first outer peripheral surface; 24, second outer peripheral surface; 25, third outer peripheral surface; 3, second pipe fitting; 31, second limiting groove; 32, ball mounting hole; 33, first inner peripheral surface; 34, second inner peripheral surface; 35, bearing mounting groove; 36, internal thread interface; 4, sealing ring; 5, limiting ball; 6, bearing; 7, locking ball. DETAILED DESCRIPTION

[0032] The utility model will be further described in conjunction with the drawings with specific embodiments, referring to Figures 1-7 :

[0033] Embodiment 1

[0034] Comparing with the prior art Figure 1 to the accompanying drawings Figure 5 , a liquefied gas spray gun rotating connection head, including the first pipe fitting 2 of the side of the connection head 1 and the second pipe fitting 3 of the side of the handle shell (not drawn in the drawing, the handle shell of the embodiment is same with the handle shell structure of the prior art non-rotating handle), the first pipe fitting 2 is rotatably inserted in the second pipe fitting 3, and the first pipe fitting 2 and the second pipe fitting 3 are provided with sealing structure, axial limiting structure and rotating support structure:

[0035] the sealing structure includes the sealing ring 4 sealing the outer wall of the first pipe fitting 2 and the inner wall of the second pipe fitting 3, and specifically, in the embodiment, the outer wall of the first pipe fitting 2 is provided with annular sealing groove 22, the annular sealing groove 22 is sleeved with the sealing ring 4, and the sealing ring 4 is in contact with the inner wall of the second pipe fitting 3 and is sealed, the sealing ring 4 is arranged to form a sealing structure between the first pipe fitting 2 and the second pipe fitting 3, and preferably, in order to obtain better sealing effect, the annular sealing groove 22 is provided with two or more than two and is respectively provided with corresponding sealing ring 4.​​

[0036] The axial limiting structure comprises a first limiting groove 21 arranged on the outer wall of the first pipe 2 and a second limiting groove 31 arranged on the inner wall of the second pipe 3, and the first limiting groove 21 and the second limiting groove 31 are oppositely arranged and jointly embedded with a plurality of limiting balls 5; specifically, in the embodiment, the first limiting groove 21 and the second limiting groove 31 have the same groove depth, and the groove depth is half of the diameter of the limiting ball 5; after installation, the limiting ball 5 is in contact with the first limiting groove 21 and the second limiting groove 31 at the same time, forming an axial limiting structure.

[0037] The rotating supporting structure comprises a bearing 6, the outer ring of the bearing 6 is in interference fit with the inner wall of the second pipe 3, and the inner ring of the bearing 6 is in interference fit with the outer wall of the first pipe 2, so that the first pipe 2 and the second pipe 3 can rotate relative to each other.

[0038] In use, the joint 1 is connected with the hose of the gas supply device, and the liquefied gas is sequentially transported through the joint 1, the first pipe 2, the second pipe 3 and the metal pipe in the handle shell; under the action of the bearing 6, the first pipe 2 and the second pipe 3 can rotate relative to each other, thereby reducing the restriction of the hose on the use angle of the spray gun and reducing the torsion of the hose; during the transportation process, the first pipe 2 and the second pipe 3 are in sealed connection, which can avoid leakage of the liquefied gas, the limiting ball 5 is arranged in the combined limiting groove formed by the first limiting groove 21 and the second limiting groove 31, which can form an axial limiting structure to prevent the first pipe 2 and the second pipe 3 from being separated.

[0039] In the embodiment, the sealing structure, the axial limiting structure and the rotating supporting structure are sequentially arranged in the direction from the handle shell to the joint 1.

[0040] In order to facilitate the installation of the limiting ball 5, the second pipe 3 is provided with a ball installation hole 32 in communication with the second limiting groove 31, the diameter of the ball installation hole 32 is greater than the diameter of the limiting ball 5, a locking ball 7 is embedded in the ball installation hole 32, the diameter of the locking ball 7 is greater than the diameter of the limiting ball 5 and is in interference fit with the ball installation hole 32; preferably, the ball installation hole 32 is arranged in the radial direction of the second pipe 3; preferably, the ball installation hole 32 is arranged at the same axial position as the limiting groove; after the first pipe 2 is inserted into the predetermined position, the limiting ball 5 is sequentially placed into the first limiting groove 21 and the second limiting groove 31 through the ball installation hole 32, and after the placement is completed, the locking ball 7 is embedded in the ball installation hole 32 by knocking or other methods to complete the installation.

[0041] To facilitate and ensure precise installation, the first pipe fitting 2 is provided with a first outer peripheral surface 23, a second outer peripheral surface 24, and a third outer peripheral surface 25, whose radial dimensions increase sequentially. A stepped structure is formed between the first outer peripheral surface 23 and the second outer peripheral surface 24, and between the second outer peripheral surface 24 and the third outer peripheral surface 25. The second pipe fitting 3 is fitted over the first outer peripheral surface 23 and the second outer peripheral surface 24 of the first pipe fitting 2 and is provided with a first inner peripheral surface 33 and a second inner peripheral surface 34 that mate with them. A stepped structure is formed between the first inner peripheral surface 33 and the second inner peripheral surface 34.

[0042] Furthermore, to avoid the influence of the axial limiting structure on the sealing structure, the annular sealing groove 22 is provided on the first outer peripheral surface 23, the first limiting groove 21 is provided on the second outer peripheral surface 24, and the second limiting groove 31 is provided on the second inner peripheral surface 34; to facilitate the installation of the bearing 6, a bearing mounting step is formed between the second outer peripheral surface 24 and the third outer peripheral surface 25, and a bearing mounting groove 35 is provided at the outer end of the second inner peripheral surface 34, and the bearing 6 is assembled between the bearing mounting step and the bearing mounting groove 35.

[0043] During installation, the sealing ring 4 is fitted into the annular sealing groove 22, the bearing 6 is fitted onto the bearing mounting step, the first pipe 2 is inserted into the second pipe 3, and after being inserted into the predetermined position, the limiting ball 5 is installed, and finally the locking ball 7 is installed to complete the assembly of the rotating component.

[0044] To facilitate the connection between the rotating component and the handle housing in this embodiment, the handle housing is detachably connected to the second pipe 3. The end of the handle housing near the connector 1 is provided with an external thread interface, and the end of the second pipe 3 away from the connector 1 is provided with an internal thread interface 36. The external thread interface and the internal thread structure are screwed together for fixation. After the installation of the rotating component is completed, it can be easily screwed onto the handle housing. At the same time, the rotating component can also be easily disassembled and replaced.

[0045] In this embodiment, the connector 1 is integrally formed with the first pipe fitting 2, and the axis of the connector 1 is coaxial with the axis of the first pipe fitting 2.

[0046] Example 2

[0047] Comparison Appendix Figure 6 and attached Figure 7 In this embodiment, the connector 1 is detachably connected to the first pipe fitting 2, and the axis of the connector 1 forms an angle with the axis of the first pipe fitting 2; preferably, the connector 1 and the first pipe fitting 2 are screwed together.

[0048] By the embodiment 1 and the embodiment 2, it is shown that the connecting structure can be adapted to various different specifications of liquefied gas spray guns. In addition, by changing the thread type, various different size liquefied gas spray guns can also be adapted.

[0049] The above embodiment is only a preferred embodiment of the utility model, and does not limit the protection scope of the utility model, so that: all equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A rotating connection for a LPG flare gun, comprising a first pipe element (2) on the side of the connection (1) and a second pipe element (3) on the side of the handle housing, the first pipe element (2) being rotatably inserted in the second pipe element (3), characterized in that The first pipe (2) and the second pipe (3) are provided with a sealing structure, an axial limiting structure and a rotary supporting structure: The sealing structure comprises a sealing ring (4) sealing the outer wall of the first pipe (2) and the inner wall of the second pipe (3); The axial limiting structure comprises a first limiting groove (21) provided on the outer wall of the first pipe (2) and a second limiting groove (31) provided on the inner wall of the second pipe (3), and the first limiting groove (21) and the second limiting groove (31) are oppositely arranged and jointly embedded with a plurality of limiting balls (5); The rotary supporting structure comprises a bearing (6).

2. A rotating connector for a liquid gas flare gun as defined in claim 1, wherein The sealing structure, the axial limiting structure and the rotary supporting structure are sequentially arranged from the handle shell to the joint (1).

3. A rotating connection for a liquid gas flare gun according to claim 2, characterized in that The outer wall of the first pipe (2) is provided with one or more annular sealing grooves (22), and the annular sealing grooves (22) are sleeved with the sealing ring (4), which is in contact with the inner wall of the second pipe (3) and is sealed.

4. A rotating connector for a liquid gas flare gun as defined in claim 1, wherein The first limiting groove (21) and the second limiting groove (31) have the same groove depth, and are each half the diameter of the limiting ball (5).

5. A rotating connector for a liquid gas flare gun as defined in claim 1, wherein The second pipe (3) is provided with a ball mounting hole (32) in communication with the second limiting groove (31), the hole diameter of the ball mounting hole (32) is greater than the diameter of the limiting ball (5), the ball mounting hole (32) is embedded with a locking ball (7), the diameter of the locking ball (7) is greater than that of the limiting ball (5) and is in interference fit with the ball mounting hole (32).

6. A rotating connector for a liquid gas flare gun as defined in claim 3, wherein The first pipe (2) is provided with a first outer periphery (23), a second outer periphery (24) and a third outer periphery (25) in order of increasing radial size, and the second pipe (3) is sleeved on the first outer periphery (23) and the second outer periphery (24) of the first pipe (2) and is provided with a first inner periphery (33) and a second inner periphery (34) cooperating therewith.

7. A rotating connection for a liquid gas flare gun according to claim 6, characterized in that The annular sealing groove (22) is arranged on the first outer periphery (23), the first limiting groove (21) is arranged on the second outer periphery (24), and the second limiting groove (31) is arranged on the second inner periphery (34); the second outer periphery (24) and the third outer periphery (25) form a bearing mounting step, the outer end of the second inner periphery (34) is provided with a bearing mounting groove (35), and the bearing (6) is assembled between the bearing mounting step and the bearing mounting groove (35).

8. A rotating connector for a liquid gas flare gun according to claim 1, wherein The joint (1) is detachably connected with the first pipe (2), and the axis of the joint (1) forms an angle with the axis of the first pipe (2).

9. A rotating connector for a liquid gas flare gun according to claim 1, wherein The joint (1) is integrally formed with the first pipe (2), and the axis of the joint (1) is coaxially arranged with the axis of the first pipe (2).

10. A rotating connector for a liquid gas flare gun as defined in claim 1, wherein, The handle shell is detachably connected with the second pipe (3), one end of the handle shell close to the joint (1) is provided with an external threaded interface, and the end of the second pipe (3) away from the joint (1) is provided with an internal threaded interface (36), and the external threaded interface and the internal threaded interface (36) are screwed and fixed.

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