A rotary joint

Abstract

This utility model belongs to the field of spray gun technology, specifically referring to a rotary joint; it includes a fixed joint and a rotary movable joint, one end of which is inserted into the adjacent end of the fixed joint. Two or more positioning pin holes are provided on the rotary movable joint or the fixed joint, and an annular groove is provided at a corresponding position on the fixed joint or the rotary movable joint. The positioning pins pass through the positioning pin holes and extend into the annular groove to achieve axial positioning of the rotary movable joint and the fixed joint, and the rotary movable joint can rotate around the fixed joint. A sealing ring is provided at the insertion joint between the rotary movable joint and the fixed joint. The rotary joint of this utility model consists of only two core components: a fixed joint and a rotary movable joint. It has fewer parts, lower manufacturing costs, and higher assembly efficiency. Connection is achieved through insertion joint and positioning pin positioning, resulting in a lighter and more compact overall structure.

Description

Technical fields:

[0001] This utility model belongs to the field of spray gun technology, and specifically refers to a rotary joint. Background technology:

[0002] Before using the spray gun, an air inlet pipe needs to be connected to the air inlet of the spray gun. Generally, an external threaded rotary air inlet connector is used to connect to the air inlet pipe on the external high-pressure power equipment.

[0003] Chinese utility model patent (authorization announcement number CN 219120048U, application date 2023.01.04, announcement date 2023.06.02) discloses a rotary air intake connector for a spray gun, including a fixed base, a rotary movable connector, and a rotary connecting core. The rotary connecting core forms a rotatable connection between the fixed base and the rotary movable connector. The end of the rotary movable connector corresponding to the fixed base is provided with a rotary positioning groove, and the end of the fixed base corresponding to the rotary movable connector is provided with a rotary positioning boss, which is located in the rotary positioning groove. The rotary positioning boss is provided with a rotary sealing groove, and the rotary sealing groove is provided with a sealing ring that connects the fixed base and the rotary movable connector.

[0004] The aforementioned rotary air intake connector consists of three core components: a fixed base, a rotary movable connector, and a rotary connecting core. It has the disadvantages of having a large number of parts, resulting in high manufacturing costs and low assembly efficiency. Summary of the Invention:

[0005] The purpose of this invention is to provide a rotary joint with fewer parts and higher assembly efficiency.

[0006] This utility model is implemented as follows:

[0007] A rotary joint includes a fixed joint and a rotary movable joint. One end of the rotary movable joint is inserted into the adjacent end of the fixed joint. Two or more positioning pin holes are provided on the rotary movable joint or the fixed joint. Annular grooves are provided at corresponding positions on the fixed joint or the rotary movable joint. Positioning pins pass through the positioning pin holes and extend into the annular grooves to achieve axial positioning of the rotary movable joint and the fixed joint. The rotary movable joint can rotate around the fixed joint. A sealing ring is provided at the insertion joint between the rotary movable joint and the fixed joint.

[0008] In one of the rotary joints described above, the fixed joint has a stepped shaft segment, including a first shaft segment and a second shaft segment. The outer diameter of the first shaft segment is greater than the outer diameter of the second shaft segment. The annular groove or arc groove is provided on the first shaft segment, and a first stepped surface is formed between the first shaft segment and the second shaft segment.

[0009] In one of the rotary joints described above, the rotary joint has a stepped inner bore, including a first inner bore section, a second inner bore section, and a third inner bore section. The diameter of the first inner bore section is greater than the diameter of the second inner bore section, which is greater than the diameter of the third inner bore section. The first inner bore section and the second inner bore section form a second stepped surface, and the second inner bore section and the third inner bore section form a third stepped surface. The second shaft section is inserted into the second inner bore section, and the sealing ring is disposed between the first stepped surface and the second stepped surface.

[0010] In one of the rotary joints described above, the locating pin and the locating pin hole are either tightly fitted or riveted together.

[0011] In one of the rotary joints described above, the outer cylindrical surface of the rotary movable joint and / or fixed joint is provided with external threads.

[0012] In one of the rotary joints described above, an external hexagonal structure is provided on the outer cylindrical surface of the rotary movable joint and / or the fixed joint.

[0013] In the aforementioned rotary joint, there are three circumferentially distributed positioning pin holes, and three corresponding positioning pins are provided.

[0014] The outstanding advantages of this utility model compared to the prior art are:

[0015] 1. The rotary joint of this utility model consists of only two core components: a fixed joint and a rotary movable joint. It has fewer parts, lower manufacturing costs, and higher assembly efficiency. The connection is achieved through plug-in mating and positioning pin limiting. The overall structure is lighter and more compact, saving installation space.

[0016] 2. The annular groove of this utility model allows the positioning pin to slide within the groove, enabling the rotating movable joint to rotate freely 360° around the fixed joint while maintaining axial fixation, thus avoiding the risk of detachment. Attached image description:

[0017] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0018] Figure 2 This is the front view of this utility model;

[0019] Figure 3 yes Figure 2 AA section view;

[0020] Figure 4 This is an exploded view of the present invention;

[0021] Figure 5 This is a schematic diagram of the fixed connector of this utility model;

[0022] Figure 6 This is a schematic diagram of the rotary movable joint of this utility model.

[0023] In the diagram: 1. Fixed joint; 2. Rotary joint; 3. Locating pin hole; 4. Annular groove; 5. Locating pin; 6. Sealing ring; 7. First shaft section; 8. Second shaft section; 9. First stepped surface; 10. First inner hole section; 11. Second inner hole section; 12. Third inner hole section; 13. Second stepped surface; 14. Third stepped surface; 15. Chamfered bevel; 16. External thread; 17. External hexagonal structure. Detailed implementation method:

[0024] The present invention will be further described below with reference to specific embodiments:

[0025] like Figure 1-6 As shown, this utility model provides a rotary joint, which includes a fixed joint 1 and a rotary movable joint 2. Both the fixed joint 1 and the rotary movable joint 2 have inner holes. One end of the rotary movable joint 2 is inserted into the adjacent end of the fixed joint 1. The rotary movable joint 2 is provided with two or more positioning pin holes 3. The fixed joint 1 is provided with an annular groove 4 at a corresponding position. The positioning pin 5 passes through the positioning pin hole 3 and extends into the annular groove 4 to realize the axial positioning of the rotary movable joint 2 and the fixed joint 1. The rotary movable joint 2 can rotate around the fixed joint 1. A sealing ring 6 is provided at the insertion joint between the rotary movable joint 2 and the fixed joint 1.

[0026] This utility model's rotary joint consists of only two core components: a fixed joint 1 and a rotary movable joint 2. Connection is achieved through a plug-in fit and a positioning pin 5 for limiting the movement. The overall structure is lighter and more compact, saving installation space. Furthermore, the sealing ring 6, located at the plug-in fit, effectively prevents gas leakage. Additionally, the annular groove 4 allows the positioning pin 5 to slide within the groove, enabling the rotary movable joint 2 to rotate freely 360° around the fixed joint 1 while maintaining axial fixation, thus avoiding the risk of detachment.

[0027] It should be noted that the positions of the positioning pin hole 3 and the annular groove 4 in this utility model can be interchanged, that is, the annular groove 4 is provided on the rotary movable joint 2, and the positioning pin hole 3 is provided on the fixed joint 1.

[0028] Furthermore, such as Figure 3 , Figure 4 and Figure 5 As shown, the fixed joint 1 has a stepped shaft section, including a first shaft section 7 and a second shaft section 8. The outer diameter of the first shaft section 7 is greater than the outer diameter of the second shaft section 8. The annular groove 4 is provided on the first shaft section 7, and a first stepped surface 9 is formed between the first shaft section 7 and the second shaft section 8.

[0029] For example Figure 3 and Figure 6As shown, the inner hole of the rotary joint 2 is a stepped inner hole, including a first inner hole section 10, a second inner hole section 11, and a third inner hole section 12. The diameter of the first inner hole section 10 is greater than the diameter of the second inner hole section 11, which is greater than the diameter of the third inner hole section 12. The first inner hole section 10 and the second inner hole section 11 form a second stepped surface 13, and the second inner hole section 11 and the third inner hole section 12 form a third stepped surface 14. The second shaft section 8 is inserted into the second inner hole section 11, and the sealing ring 6 is disposed between the first stepped surface 9 and the second stepped surface 14.

[0030] The sealing ring 6 is precisely pressed within the closed space formed by the first step surface 9 and the second step surface 13, forming a radial and axial bidirectional seal through the step difference, effectively preventing gas leakage. At the same time, the end face of the second shaft section 7 can abut against the third step surface 14, which can prevent the sealing ring 6 from failing due to excessive compression.

[0031] The outer end of the third inner hole section 13 of this utility model is provided with a chamfered bevel 15.

[0032] For example Figure 1-6 As shown, to prevent the positioning pin 5 from detaching from the fixed joint 1 or the rotating joint 2, the positioning pin 5 and the positioning pin hole 3 are tightly fitted or riveted together. Furthermore, regarding the number of positioning pins 5, this embodiment provides three, and correspondingly, three positioning pin holes 5 are also circumferentially distributed.

[0033] Furthermore, this invention can be applied to a spray gun as an air inlet connector. Therefore, external threads 16 are provided on the outer cylindrical surfaces of the rotary joint 2 and / or the fixed joint 1. In this embodiment, external threads 16 are provided on the outer cylindrical surfaces of both the rotary joint 2 and the fixed joint 1. The external threads 16 of the fixed joint 1 are threadedly connected to the spray gun, and the external threads 16 of the rotary joint 2 are threadedly connected to the air pipe.

[0034] To facilitate disassembly and assembly, this utility model provides an external hexagonal structure 17 on the outer cylindrical surface of the rotary movable joint 2 and / or the fixed joint 1 to prevent slippage when rotating the rotary movable joint 2 or the fixed joint 1.

[0035] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A rotary joint, comprising a fixed joint (1) and a rotary movable joint (2), characterized in that: One end of the rotary joint (2) is inserted into the adjacent end of the fixed joint (1). Two or more positioning pin holes (3) are provided on the rotary joint (2) or the fixed joint (1). An annular groove (4) is provided at a corresponding position on the fixed joint (1) or the rotary joint (2). The positioning pin (5) passes through the positioning pin hole (3) and extends into the annular groove (4) to realize the axial positioning of the rotary joint (2) and the fixed joint (1). The rotary joint (2) can rotate around the fixed joint (1). A sealing ring (6) is provided at the insertion joint between the rotary joint (2) and the fixed joint (1).

2. A rotary joint according to claim 1, characterized in that: The fixed joint (1) has a stepped shaft section, including a first shaft section (7) and a second shaft section (8). The outer diameter of the first shaft section (7) is greater than the outer diameter of the second shaft section (8). The annular groove (4) or arc groove is provided on the first shaft section (7). A first stepped surface (9) is formed between the first shaft section (7) and the second shaft section (8).

3. A rotary joint according to claim 2, characterized in that: The rotary joint (2) has a stepped inner hole, including a first inner hole section (10), a second inner hole section (11) and a third inner hole section (12). The diameter of the first inner hole section (10) is greater than the diameter of the second inner hole section (11) and the diameter of the third inner hole section (12). The first inner hole section (10) and the second inner hole section (11) form a second stepped surface (13), and the second inner hole section (11) and the third inner hole section (12) form a third stepped surface (14). The second shaft section (8) is inserted into the second inner hole section (11), and the sealing ring (6) is disposed between the first stepped surface (9) and the second stepped surface (13).

4. A rotary joint according to claim 1, 2, or 3, characterized in that: The positioning pin (5) and the positioning pin hole (3) are tightly fitted or riveted together.

5. A rotary joint according to claim 1, 2, or 3, characterized in that: The outer cylindrical surface of the rotary joint (2) and / or the fixed joint (1) is provided with external threads (16).

6. A rotary joint according to claim 1, 2, or 3, characterized in that: The outer cylindrical surface of the rotary joint (2) and / or the fixed joint (1) is provided with an external hexagonal structure (17).

7. A rotary joint according to claim 1, 2, or 3, characterized in that: The positioning pin holes (3) are distributed in three circumferentially, and the corresponding positioning pins (5) are provided in three ways.

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