A paint spraying machine with high sealing performance

Abstract

The invention relates to the field of spraying technology, and discloses a paint sprayer with high sealing performance, comprising an upper cylinder body and a lower cylinder body, the upper cylinder body and the lower cylinder body are connected by a detachable sealing mechanism, the detachable sealing mechanism comprises a sealing support tube, an upper detachable joint and a lower detachable joint, the two ends of the sealing support tube are respectively connected with the upper detachable joint and the lower detachable joint, the upper detachable joint is connected to the bottom of the upper cylinder body, the lower detachable joint is connected to the top of the lower cylinder body, the lower detachable joint comprises a fixed joint and a movable joint, one end of the movable joint is connected to the sealing support tube, and the other end is connected to the fixed joint, the fixed joint is fixed on the lower cylinder body, the structure of the upper detachable joint is the same as that of the lower detachable joint, the sealing support tube connects the upper cylinder body and the lower cylinder body, so that gas is transported through the sealing support tube, the sealing support tube has stronger rigidity than the corrugated tube, is not easy to be damaged, does not need frequent maintenance or replacement, and has low later maintenance cost.

Description

Technical Field

[0001] The invention relates to the technical field of spraying, in particular to a paint spraying machine with high sealing performance. Background Art

[0002] The main working part of the sprayer is a double-acting pneumatic hydraulic booster pump, and the reversing mechanism is a special form of pilot-type fully pneumatically controlled gas distribution reversing device. After the compressed air enters, when the piston moves to the upper or lower end of the cylinder, the upper pilot valve or the lower pilot valve is actuated, and the airflow is controlled to instantly push the gas distribution reversing device to reverse, so that the piston of the pneumatic motor can make a stable and continuous reciprocating motion. Since the piston is rigidly connected to the plunger in the paint plunger pump, and the area of ​​the piston is larger than that of the plunger, the inhaled paint is pressurized. The pressurized paint is transported to the airless spray gun through a high-pressure hose, and finally the hydraulic pressure is released at the airless nozzle, and it is instantly atomized and sprayed onto the surface of the object to be coated to form a coating layer. At present, the upper cylinder and the lower cylinder of the spray machine are connected by a bellows for air intake. This is mainly because the bellows is elastic and can form an interference fit at the joints at both ends to ensure that the joints between the bellows and the upper cylinder, and the joints between the bellows and the lower cylinder have good sealing properties. However, the bellows has low rigidity and is prone to damage and leakage, which affects the spraying effect. The bellows needs to be replaced frequently in the later stage, and its later maintenance cost is high. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a paint sprayer with high sealing performance. The use of bellows is abandoned and a sealing support pipe made of metal is used for connection, which ensures the sealing effect while extending the service life of the sealing support pipe and reducing the subsequent maintenance cost.

[0004] The objective of the present invention is achieved through the following technical solutions: A paint sprayer with high sealing performance, comprising an upper cylinder body and a lower cylinder body, wherein the upper cylinder body and the lower cylinder body are connected by a detachable sealing mechanism, wherein the detachable sealing mechanism comprises a sealing support tube, an upper detachable joint and a lower detachable joint, wherein the sealing support tube is made of metal material, wherein the upper detachable joint and the lower detachable joint are connected to the two ends of the sealing support tube respectively, wherein the upper detachable joint is connected to the bottom of the upper cylinder body, wherein the lower detachable joint is connected to the top of the lower cylinder body, wherein the lower detachable joint comprises a fixed joint and a movable joint, wherein one end of the movable joint is connected to the sealing support tube, and the other end is connected to the fixed joint, wherein the fixed joint is fixed to the lower cylinder body, and the structure of the upper detachable joint is the same as that of the lower detachable joint;

[0005] An air motor is provided on the upper cylinder body, a suction pipe is connected to the side wall of the lower cylinder body, a suction head is connected to the end of the suction pipe away from the lower cylinder body, a discharge valve is connected to the lower cylinder body, one port of the discharge valve is connected to an accumulator, and two ports of the discharge valve are connected to a spray gun via a high-pressure fluid hose.

[0006] Furthermore, the movable joint includes an inner ring body and an outer ring body, bellows are fixed at both ends of the sealing support tube, the outer wall of the inner ring body is provided with a plurality of outer ring grooves at equal intervals along its own axial direction, the inner wall of the outer ring body is provided with a plurality of annular platforms at equal intervals along its own axial direction, the bellows is located between the outer ring body and the inner ring body, the annular protrusion on the inner wall of the bellows is adapted to the outer ring groove, and the annular platform is adapted to the annular groove on the outer wall of the bellows.

[0007] Furthermore, the outer ring body includes two semi-ring bodies, the inner walls of the semi-ring bodies are fixed with positioning cones, the outer wall of the inner ring body is provided with positioning holes, the two semi-ring bodies are connected by bolts, the positioning cones are fitted in the positioning holes, and the sealing support tube is interference fit between the inner ring body and the outer ring body.

[0008] Furthermore, the outer ring body is inserted into the fixed joint, and the outer wall of the outer ring body is provided with a plurality of mounting grooves along its circumference, the mounting grooves are in the shape of a truncated cone, and the diameter of the mounting grooves gradually increases in the direction approaching the fixed joint, and the side wall of the fixed joint is provided with a plurality of through holes, and the plurality of through holes correspond one-to-one to the plurality of mounting grooves, and connecting beads are slidably arranged in the through holes, and the connecting beads are partially adapted in the mounting grooves, so as to connect the fixed joint with the movable joint together.

[0009] Furthermore, a movable sleeve on the fixed joint is provided with a limiting ring, an inner wall of the limiting ring is provided with an annular groove, the through hole is a stepped hole, the through hole includes a large diameter hole and a small diameter hole, the connecting bead is slidably adapted in the large diameter hole, when the inner wall of the limiting ring contacts the connecting bead, the connecting bead partially passes through the small diameter hole and is adapted in the mounting groove, when the connecting bead contacts the side wall of the annular groove, the connecting bead is disengaged from the annular groove, and the axial thickness of the annular groove in the limiting ring gradually increases along the direction approaching the fixed joint.

[0010] Furthermore, a sealing ring is provided between the limiting ring and the fixed joint, the sealing ring is located below the connecting bead, and the sealing ring is interference fit between the limiting ring and the fixed joint.

[0011] Further, the sealing ring includes a cylindrical sealing body and a Y-shaped sealing body, the closed end of the Y-shaped sealing body is fixedly connected to the cylindrical sealing body, the fixed sleeve on the fixed joint is provided with a shoulder, the cylindrical sealing body is sleeved on the shoulder, the outer wall of the cylindrical sealing body contacts the inner wall of the limiting ring, the inner wall of the limiting ring is provided with an annular sealing groove, one end of the opening of the Y-shaped sealing body is located in the annular sealing groove, and the other end of the opening of the Y-shaped sealing body is against the side wall of the fixed joint.

[0012] Furthermore, the top fixing sleeve of the outer ring body is provided with a positioning ring, a positioning protrusion is fixed at the bottom of the positioning ring, and a positioning groove is opened at the top of the fixed joint. When the positioning protrusion is adapted in the positioning groove, the installation groove coaxially corresponds to the through hole.

[0013] Furthermore, a hollow threaded ring is coaxially fixed to the bottom of the positioning ring, and a threaded hole is opened on the top of the limiting ring. When the hollow threaded ring is fitted into the threaded hole, the inner wall of the limiting ring contacts the connecting bead.

[0014] Furthermore, an annular sealing gasket is sleeved on the hollow threaded ring, and the annular sealing gasket is fixed on the positioning ring. When the movable joint is connected to the fixed joint, the limiting ring squeezes the annular sealing gasket to generate compression deformation.

[0015] The beneficial effects of the present invention are:

[0016] The sealing support tube connects the upper cylinder body and the lower cylinder body, so that gas is transported through the sealing support tube. The two ends of the sealing support tube form a sealed connection to ensure the sealing requirement. At the same time, the sealing support tube has stronger rigidity than the corrugated tube, is not easy to be damaged, does not require frequent maintenance or replacement, and its later maintenance cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a paint sprayer with high sealing performance according to the present invention;

[0018] Figure 2 It is a structural schematic diagram of a detachable sealing mechanism in a paint sprayer with high sealing performance according to the present invention;

[0019] Figure 3 This is a schematic diagram of the assembly of an inner ring body and a sealing support tube in a paint sprayer with high sealing performance according to the present invention;

[0020] Figure 4 This is a structural schematic diagram of a semi-ring body in a paint sprayer with high sealing performance according to the present invention;

[0021] Figure 5 A partial cross-sectional view of a paint sprayer with high sealing performance according to the present invention;

[0022] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0023] Figure 7 for Figure 5 Enlarged view of point B in the middle;

[0024] In the figure, 1-upper cylinder body, 2-lower cylinder body, 4-sealing support tube, 5-fixed joint, 6-movable joint, 7 air motor, 8-suction pipe, 9-suction head, 10-discharge valve, 11-accumulator, 12-high-pressure fluid hose, 13-spray gun, 14-inner ring body, 15-outer ring body, 16-outer ring groove, 17-annular platform, 18-positioning cone, 19-positioning hole, 20-bolt, 21-mounting groove, 22-through hole, 23-connecting bead, 24-limiting ring, 25-annular groove, 26-Y-shaped sealing body, 27-shaft shoulder, 28-positioning ring, 29-positioning protrusion, 30-positioning groove, 31-hollow threaded ring, 32-annular sealing gasket, 33-cylindrical sealing body. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0026] Embodiment 1: Figures 1 to 7As shown, a paint sprayer with high sealing performance includes an upper cylinder body 1 and a lower cylinder body 2. The upper cylinder body 1 and the lower cylinder body 2 are connected by a detachable sealing mechanism. The detachable sealing mechanism includes a sealing support tube 4, an upper detachable joint and a lower detachable joint. The sealing support tube 4 is made of metal material. The two ends of the sealing support tube 4 are respectively connected with an upper detachable joint and a lower detachable joint. The upper detachable joint is connected to the bottom of the upper cylinder body 1, and the lower detachable joint is connected to the top of the lower cylinder body 2. The lower detachable joint includes a fixed joint 5 and a movable joint. 6, one end of the movable joint 6 is connected to the sealing support tube 4, and the other end is connected to the fixed joint 5, the fixed joint 5 is fixed on the lower cylinder body 2, the structure of the upper detachable joint is the same as that of the lower detachable joint, the bottom of the upper cylinder body 1 and the top of the lower cylinder body 2 are welded with fixed joints 5, so that the connection position of the fixed joint 5 and the upper cylinder body 1 and the connection position of the fixed joint 5 and the lower cylinder body 2 have strong sealing performance, the air outlet provided in the upper cylinder body 1 is located in the fixed joint 5 of the upper cylinder body 1, and the air inlet provided in the lower cylinder body 2 is located In the fixed joint 5 of the lower cylinder body 2, movable joints 6 are connected to both ends of the sealing support tube 4, and then the two movable joints 6 are respectively connected to the two fixed joints 5, so that the connection is sealed in the sealing support tube 4, and gas is transported through the sealing support tube 4. The sealing support tube 4 is made of metal material, preferably: 45 steel, which increases the strength and has low cost, improves the sealing performance of the connection between the upper cylinder body 1 and the lower cylinder body 2, will not affect the pressure in the sprayer, and will not affect the spraying effect of the sprayer. Compared with the traditional structure, it does not require frequent maintenance or replacement of the bellows, which reduces the cost; at the same time, the sealing support tube 4 can support the upper cylinder body 1, so that the connection between the upper cylinder body 1 and the lower cylinder body 2 does not require additional connecting supports, making the sprayer structure simpler and more compact. Secondly, the two ends of the sealing support tube 4 are detachably connected to the upper cylinder body 1 and the lower cylinder body 2, which is convenient for later disassembly to maintain the sealing support tube 4, and convenient for disassembling the upper cylinder body 1 and the lower cylinder body 2 for repair or maintenance, and its later maintenance cost is low. An air motor 7 is provided on the upper cylinder body 1, and a suction pipe 8 is connected to the side wall of the lower cylinder body 2. The end of the suction pipe 8 away from the lower cylinder body 2 is connected to a suction head 9, and the lower cylinder body 2 is connected to a discharge valve 10. One port of the discharge valve 10 is connected to an accumulator 11, and the other ports of the discharge valve 10 are connected to a spray gun 13 through a high-pressure fluid hose 12. The suction head 9 is placed in a paint bucket, and the paint enters the lower cylinder body 2 through the suction head 9 and the suction pipe 8. The air motor 7 pressurizes the inhaled air, and the pressurized paint is transported to the spray gun 13 through the high-pressure fluid hose 12. Finally, the hydraulic pressure is released at the spray gun 13, and the paint is sprayed onto the surface of the coated object after instantaneous atomization to form a coating layer, thereby completing the spraying operation. This is a prior art and will not be described in detail.

[0027] Embodiment 2: Since both ends of the sealing support tube 4 are connected to the movable joints 6 respectively, it is necessary to ensure the sealing performance between the movable joints 6 and the sealing support tube 4. Although the rigidity and strength of the sealing support tube 4 are much greater than those of the bellows, the elasticity of the sealing support tube 4 is less than that of the bellows, resulting in reduced sealing performance at the connection positions of the two ends of the sealing support tube 4. Therefore, based on the embodiment 1, as Figures 2 to 5 As shown, the movable joint 6 includes an inner ring body 14 and an outer ring body 15. Both ends of the sealing support tube 4 are fixed with bellows. The bellows are connected to the sealing support tube 4 by hot melting, so that a full seal is formed between the sealing support tube 4 and the bellows. The outer wall of the inner ring body 14 is provided with a plurality of outer ring grooves 16 at equal intervals along its own axial direction. The inner wall of the outer ring body 15 is provided with a plurality of annular platforms 17 at equal intervals along its own axial direction. The bellows is located between the outer ring body 15 and the inner ring body 14. The annular protrusion on the inner wall of the bellows is adapted to fit the outer ring groove 16. 6, the annular platform 17 is adapted to the annular groove of the outer wall of the bellows, and bellows are arranged at both ends of the sealing support tube 4. The elasticity of the bellows is used to form an interference fit to ensure that the movable joint 6 and the sealing support tube 4 have a strong sealing performance. Specifically, the inner ring body 14 is installed in the bellows, and the position of the inner ring body 14 is adjusted so that the annular protrusion on the inner wall of the bellows fits in the outer ring groove 16, and then the outer ring body 15 is sleeved on the bellows so that the annular platform 17 cooperates with the annular groove on the outer wall of the sealing bellows. Finally, the outer ring The bellows 15 is connected with the inner ring body 14. When the inner ring body 14 is connected with the outer ring body 15, the gap between the annular platform 17 and the outer ring groove 16 is smaller than the thickness of the sealing support tube 4, so that the bellows is squeezed and deformed between the outer ring body 15 and the inner ring body 14, so that the bellows is interference fit between the inner ring body 14 and the outer ring body 15 through its own compression deformation. The interference fit of the bellows is used to improve the sealing performance of the connection position, so that the sealing performance of the traditional overall bellows connection is maintained, and the detachable connection between the sealing support tube 4 and the movable joint 6 is achieved, while the connection position between the movable joint 6 and the sealing support tube 4 has a strong sealing performance; secondly, the bellows is completely protected between the inner ring body 14 and the outer ring body 15, so that the bellows at both ends of the sealing support tube 4 are hidden and not easily damaged, and the upper cylinder body 1 and the lower cylinder body 2 are connected by the exposed support of the sealing support tube 4, and the high sealing performance of the bellows is used to seal the connection position, thereby ensuring the sealing performance and greatly extending the service life of the sealing support tube 4.

[0028] Embodiment 3: Since the inner ring body 14 is first installed in the sealing support tube 4 by using the elasticity of the bellows, it is difficult to compress the bellows to fit the outer ring body 15 on the sealing support tube 4 when the outer ring body 15 is subsequently installed. Therefore, based on the embodiment 2, as shown in FIG. Figures 2 to 6As shown, the outer ring body 15 includes two semi-ring bodies, the inner wall of the semi-ring body is fixed with a positioning cone 18, the outer wall of the inner ring body 14 is provided with a positioning hole 19, the two semi-ring bodies are connected by bolts 20, the positioning cone 18 is adapted in the positioning hole 19, the bellows is interference fit between the inner ring body 14 and the outer ring body 15, the outer ring body 15 is designed as a split structure, the two semi-ring bodies are connected together by bolts 20, one of the semi-ring bodies is provided with a through hole, and the other semi-ring body is provided with a threaded hole at a position corresponding to the through hole, the positioning cone 18 is corresponding to the positioning hole 19, and the semi-ring body is assembled on the bellows. Inside the corrugated tube, the positioning of the outer ring body 15 and the inner ring body 14 is completed by the cooperation of the positioning cone 18 and the positioning hole 19, and then the bolt 20 is threaded through the through hole and fitted into the threaded hole, so that the two semi-ring bodies are connected together to form the outer ring body 15, which facilitates the installation of the outer ring body 15 and completes the positioning and installation of the outer ring body 15, the corrugated tube and the inner ring body 14, so that the sealing support tube 4 and the movable joint 6 have a strong sealing performance; in specific implementation, the outer ring body 15 can also be connected to the sealing support tube 4 by screws to strengthen the connection strength between the sealing support tube 4 and the movable joint 6.

[0029] Embodiment 4: The movable joint 6 needs to be detachably mounted on the fixed joint 5. Therefore, based on the embodiment 3, as shown in FIG. Figures 2 to 7As shown, the outer ring body 15 is inserted into the fixed joint 5, and the outer wall of the outer ring body 15 is provided with a plurality of mounting grooves 21 along its circumference. The mounting grooves 21 are in the shape of a truncated cone, and the diameter of the mounting grooves 21 gradually increases in the direction close to the fixed joint 5. The side wall of the fixed joint 5 is provided with a plurality of through holes 22, and the plurality of through holes 22 correspond to the plurality of mounting grooves 21 one by one. Connecting beads 23 are slidably arranged in the through holes 22, and the connecting beads 23 are partially adapted in the mounting grooves 21, and are used to connect the fixed joint 5 with the movable joint 6. A limiting ring 24 is movably sleeved on the fixed joint 5, and an annular groove 25 is provided on the inner wall of the limiting ring 24. The through hole 22 is a stepped hole, and the through hole 22 includes a large The connecting bead 23 is slidably adapted in the large diameter hole, and the diameter of the small diameter hole is smaller than the diameter of the connecting bead 23, so that the connecting bead 23 cannot pass through the small diameter hole, thereby preventing the connecting bead 23 from falling out of the through hole 22. When the inner wall of the limiting ring 24 contacts the connecting bead 23, the connecting bead 23 partially passes through the small diameter hole and is adapted in the installation groove 21. When the connecting bead 23 contacts the side wall of the annular groove 25, the connecting bead 23 is disengaged from the annular groove 25. The axial thickness of the annular groove 25 in the limiting ring 24 gradually increases in the direction close to the fixed joint 5. By moving the limiting ring 24, the position of the annular groove 25 is adjusted. When the movable joint 6 is installed, the limiting ring 24 The annular groove 25 corresponds to the through hole 22, and then the movable joint 6 is inserted into the fixed joint 5. The movable joint 6 contacts the arc surface of the connecting bead 23, and the movable joint 6 squeezes the connecting bead 23 to move, so that the movable joint 6 can be smoothly inserted into the fixed joint 5. When the movable joint 6 is plugged into place, the installation groove 21 corresponds to the through hole 22. At this time, the limit ring 24 is moved. Since the axial thickness of the annular groove 25 in the limit ring 24 gradually increases in the direction close to the fixed joint 5, the upper wall and the bottom wall of the cross section of the annular groove 25 are both inclined surfaces. Under the guidance of the inclined surface, the limit ring 24 squeezes the connecting bead 23 to move. When the inner wall of the limit ring 24 contacts the connecting bead 23, the connecting bead 23 It is partially adapted in the installation groove 21, so that the movable joint 6 is connected with the fixed joint 5. When the movable joint 6 needs to be disassembled, the limiting ring 24 is moved so that the annular groove 25 of the limiting ring corresponds to the through hole 22. At this time, the movable joint 6 is moved. Since the cross-sectional shape of the installation groove 21 is a truncated cone shape, after losing the resistance of the limiting ring 24, the connecting bead 23 cannot be stably adapted in the installation groove 21. In the process of moving the movable joint 6, the connecting bead 23 is squeezed and moved, so that the connecting bead 23 is separated from the installation groove 21, that is, the disassembly of the movable joint 6 is completed, so that the installation and disassembly of the movable joint 6 can be completed by changing the position of the limiting ring 24, and the operation is simple and quick.

[0030] Embodiment 5: Due to the arrangement of the through hole 22 and the annular groove 25, although the connection between the movable joint 6 and the fixed joint 5 becomes simple and quick, the sealing performance between the movable joint 6 and the fixed joint 5 is poor. Therefore, based on the embodiment 4, as shown in FIG. Figures 5 to 7As shown, a sealing ring is provided between the limiting ring 24 and the fixed joint 5, the sealing ring is located below the connecting bead 23, the sealing ring is interference fit between the limiting ring 24 and the fixed joint 5, a sealing surface is formed below the through hole 22 by the sealing ring, the sealing ring comprises a cylindrical sealing body 33 and a Y-shaped sealing body 26, the closed end of the Y-shaped sealing body 26 is fixedly connected to the cylindrical sealing body 33, a fixed sleeve is provided with a shaft shoulder 27 on the fixed joint 5, the cylindrical sealing body 33 is sleeved on the shaft shoulder 27, the outer wall of the cylindrical sealing body 33 contacts the inner wall of the limiting ring 24, the inner wall of the limiting ring 24 is provided with an annular sealing groove, one end of the opening of the Y-shaped sealing body 26 is located in the annular sealing groove, and the other end of the opening of the Y-shaped sealing body 26 is against the side wall of the fixed joint 5. The inner wall and outer wall of the Y-shaped sealing body 26 respectively abut against the fixed joint 5 and the limiting ring 24, so that a first-level seal is formed between the limiting ring 24 and the fixed joint 5. When the gas enters between the limiting ring 24 and the fixed joint 5 through the through hole 22 and overflows from the bottom, the gas will squeeze the Y-shaped sealing body 26 outward, so that the Y-shaped sealing body 26 gradually abuts against the fixed joint 5 and the limiting ring 24, making the sealing effect better and better. The columnar sealing body 33 is interference-fitted between the fixed joint 5 and the limiting ring 24 to form a second-level seal, thereby greatly improving the sealing performance through a double-layer sealing method, realizing the detachable connection between the fixed joint 5 and the movable joint 6, and also improving the sealing performance between the fixed joint 5 and the movable joint 6.

[0031] Embodiment 6: To prevent gas from entering between the limit ring 24 and the fixed joint 5 through the through hole and overflowing from the top, based on Embodiment 5, as Figures 5 to 7As shown, the top of the outer ring body 15 is fixedly sleeved with a positioning ring 28, the bottom of the positioning ring 28 is fixed with a positioning protrusion 29, the top of the fixed joint 5 is provided with a positioning groove 30, when the positioning protrusion 29 is adapted in the positioning groove 30, the installation groove 21 is coaxially corresponding to the through hole 22, the bottom of the positioning ring 28 is coaxially fixed with a hollow threaded ring 31, the top of the limiting ring 24 is provided with a threaded hole, when the hollow threaded ring 31 is adapted in the threaded hole, the inner wall of the limiting ring 24 contacts the connecting bead 23, and the hollow threaded ring 31 is sleeved with The annular sealing gasket 32 ​​is fixed on the positioning ring 28. When the movable joint 6 is connected to the fixed joint 5, the limiting ring 24 squeezes the annular sealing gasket 32 ​​to generate compression deformation. The insertion depth of the movable joint 6 is positioned by the positioning ring 28, and the position of the mounting groove 21 is positioned by the cooperation of the positioning protrusion 29 and the positioning groove 30. When the movable joint 6 is inserted, the positioning protrusion 29 is adapted to the positioning groove 30, and the positioning ring 28 contacts the fixed joint 5. At this time, the mounting groove 21 corresponds to the through hole 22. Then, the limiting ring 24 is rotated upward so that the limiting ring 24 is threadedly mounted on the hollow threaded ring 31, and the limiting ring 24 is screwed in so that the limiting ring 24 squeezes the annular sealing gasket 32 ​​to deform. At this time, the inner wall of the limiting ring 24 contacts the connecting bead 23, so that the connecting bead 23 is partially adapted to the installation groove 21, and the installation of the fixed joint 5 and the movable joint 6 is completed. Since the annular sealing gasket 32 ​​is tightly attached to the limiting ring 24 through its own deformation, a high-strength sealing surface is formed between the limiting ring 24 and the positioning ring 28, thereby strengthening the through hole 22. The upper area is sealed to prevent gas from overflowing upward. Specifically, an elastic sealing ring is fixed to the bottom of the positioning ring 28, and the positioning protrusion 29 is located on the outside of the elastic sealing ring. A sealing ring groove is provided on the top of the fixed joint 5. When the positioning protrusion 29 is fitted into the positioning groove 30, the elastic sealing ring is interference fit into the sealing ring groove, thereby fully sealing the detachable sealing mechanism, having better sealing performance and being more convenient for disassembly and assembly; secondly, the positioning ring 28 and the hollow threaded ring 31 both adopt a semi-ring structure, which is paired with the outer ring body 15.

Claims

1. A paint sprayer with high sealing performance, characterized in that: The invention comprises an upper cylinder body (1) and a lower cylinder body (2), wherein the upper cylinder body (1) and the lower cylinder body (2) are connected via a detachable sealing mechanism, wherein the detachable sealing mechanism comprises a sealing support tube (4), an upper detachable joint and a lower detachable joint, wherein the sealing support tube (4) is made of a metal material, and the upper detachable joint and the lower detachable joint are respectively connected at both ends of the sealing support tube (4), wherein the upper detachable joint is connected to the bottom of the upper cylinder body (1), and the lower detachable joint is connected to the top of the lower cylinder body (2), wherein the lower detachable joint comprises a fixed joint (5) and a movable joint (6), wherein one end of the movable joint (6) is connected to the sealing support tube (4), and the other end is connected to the fixed joint (5), wherein the fixed joint (5) is fixed to the lower cylinder body (2), and the structure of the upper detachable joint is the same as that of the lower detachable joint; The upper cylinder body (1) is provided with an air motor (7), the side wall of the lower cylinder body (2) is connected to a suction pipe (8), one end of the suction pipe (8) away from the lower cylinder body (2) is connected to a suction head (9), the lower cylinder body (2) is connected to a discharge valve (10), one port of the discharge valve (10) is connected to an accumulator (11), and the other port of the discharge valve (10) is connected to a spray gun (13) via a high-pressure fluid hose (12); The movable joint (6) comprises an inner ring body (14) and an outer ring body (15), and bellows are fixed at both ends of the sealing support tube (4). The outer wall of the inner ring body (14) is provided with a plurality of outer ring grooves (16) at equal intervals along its own axial direction, and the inner wall of the outer ring body (15) is provided with a plurality of annular platforms (17) at equal intervals along its own axial direction. The bellows is located between the outer ring body (15) and the inner ring body (14), and the annular protrusion on the inner wall of the bellows is adapted to fit the outer ring groove (16), and the annular platform (17) is adapted to fit the annular groove on the outer wall of the bellows; The outer ring body (15) is inserted into the fixed joint (5); the outer wall of the outer ring body (15) is provided with a plurality of mounting grooves (21) along its circumference; the mounting grooves (21) are in the shape of a truncated cone; the diameter of the mounting grooves (21) gradually increases in a direction approaching the fixed joint (5); a plurality of through holes (22) are provided on the side wall of the fixed joint (5); the plurality of through holes (22) correspond to the plurality of mounting grooves (21) in a one-to-one manner; connecting beads (23) are slidably provided in the through holes (22); the connecting beads (23) are partially adapted to fit in the mounting grooves (21) and are used to connect the fixed joint (5) and the movable joint (6) together; A limit ring (24) is movably sleeved on the fixed joint (5), an annular groove (25) is provided on the inner wall of the limit ring (24), the through hole (22) is a stepped hole, the through hole (22) comprises a large diameter hole and a small diameter hole, the connecting bead (23) is slidably fitted in the large diameter hole, when the inner wall of the limit ring (24) contacts the connecting bead (23), the connecting bead (23) partially passes through the small diameter hole and is fitted in the mounting groove (21), when the connecting bead (23) contacts the side wall of the annular groove (25), the connecting bead (23) is separated from the annular groove (25), and the thickness of the annular groove (25) in the axial direction of the limit ring (24) gradually increases in a direction close to the fixed joint (5); The top fixing sleeve of the outer ring body (15) is provided with a positioning ring (28), the bottom of the positioning ring (28) is fixed with a positioning protrusion (29), the top of the fixed joint (5) is provided with a positioning groove (30), and when the positioning protrusion (29) is fitted into the positioning groove (30), the mounting groove (21) coaxially corresponds to the through hole (22); A hollow threaded ring (31) is coaxially fixed to the bottom of the positioning ring (28), and a threaded hole is formed on the top of the limiting ring (24); when the hollow threaded ring (31) is fitted into the threaded hole, the inner wall of the limiting ring (24) contacts the connecting bead (23); An annular sealing gasket (32) is sleeved on the hollow threaded ring (31), and the annular sealing gasket (32) is fixed on the positioning ring (28). When the movable joint (6) is connected to the fixed joint (5), the limiting ring (24) squeezes the annular sealing gasket (32) to generate compression deformation.

2. A paint sprayer with high sealing performance according to claim 1, characterized in that: The outer ring body (15) comprises two semi-ring bodies, the inner walls of the semi-ring bodies are fixed with positioning cones (18), the outer wall of the inner ring body (14) is provided with positioning holes (19), the two semi-ring bodies are connected by bolts (20), the positioning cones (18) are fitted in the positioning holes (19), and the bellows is interference fit between the inner ring body (14) and the outer ring body (15).

3. A paint sprayer with high sealing performance according to claim 1, characterized in that: A sealing ring is provided between the limiting ring (24) and the fixed joint (5), the sealing ring being located below the connecting bead (23), and the sealing ring being interference-fitted between the limiting ring (24) and the fixed joint (5).

4. A paint sprayer with high sealing performance according to claim 3, characterized in that: The sealing ring comprises a cylindrical sealing body (33) and a Y-shaped sealing body (26); the closed end of the Y-shaped sealing body (26) is fixedly connected to the cylindrical sealing body (33); a shaft shoulder (27) is provided on the fixed joint (5); the cylindrical sealing body (33) is sleeved on the shaft shoulder (27); the outer wall of the cylindrical sealing body (33) contacts the inner wall of the limiting ring (24); the inner wall of the limiting ring (24) is provided with an annular sealing groove; one end of the opening of the Y-shaped sealing body (26) is located in the annular sealing groove; the other end of the opening of the Y-shaped sealing body (26) abuts against the side wall of the fixed joint (5).

Images