Spray gun suction pipe capable of preventing liquid from flowing back

Abstract

The utility model discloses a spray gun material suction pipe capable of preventing liquid backflow, which relates to the technical field of spray gun equipment and comprises a material suction pipe body, a flow stopping cavity is arranged in the middle of the material suction pipe body, and a material suction port is arranged at the top of the other end of the material suction pipe body. A dripping speed adjusting disc is fixedly arranged on the outer wall of the material suction pipe body, a fixing block is fixedly connected to the outer wall of the dripping speed adjusting disc, the function of effectively preventing liquid from flowing back when material suction is stopped is achieved through the ingeniously-designed valve clack combination, the spring, the sealing cover and other assemblies, and in order to prevent liquid from flowing back when material suction is stopped, the spraying gun material suction pipe is provided with the dripping speed adjusting disc, and the fixing block is fixedly connected to the outer wall of the dripping speed adjusting disc. The middle part of the material suction pipe body is particularly provided with a flow stopping cavity, and a series of valve clacks and spring assemblies which are matched with the flow stopping cavity to work, so that the working efficiency of the spray gun is improved, and the problem of equipment damage or environmental pollution possibly caused by liquid backflow is also avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to spray gun equipment technical field, concretely refers to a spray gun suction pipe of preventing liquid backflow. BACKGROUND

[0002] In the spraying operation, the spray gun suction pipe as a key component is responsible for conveying the paint or other liquid materials from the container to the spray gun for spraying use, however, the conventional spray gun suction pipe often faces a significant problem in the use process: when the suction pipe stops working, due to the gravity of the liquid material or the pressure change in the pipeline, the paint may flow back from the suction pipe to the container, which not only causes the waste of materials, but also may pollute the spray gun and the spraying system, affecting the spraying effect and the normal service life of the equipment.

[0003] For example, a liquid filling machine for preventing liquid backflow is disclosed in Chinese patent No. CN216584116U, which comprises a base, a nozzle, a tank, and a bracket. The tank is installed above the base through the bracket, and the nozzle is installed below the tank through the connecting frame. Two rectangular plates are installed on the inner wall of the connecting frame, and a through hole is formed in the top of each rectangular plate. The two through holes are connected to the tank and the nozzle, respectively. In the utility model, when filling, the liquid flows into the through hole above the connecting frame. The first pressure plate is impacted by the liquid and drives the rack to move. The two racks and the two first pressure plates are driven to move closer to each other through the transmission of the gear. The elastic element is deformed, thereby opening the two through holes and allowing filling. After filling is completed, the two through holes are closed under the reaction force of the elastic element, thereby preventing liquid backflow and enhancing safety. Although the device has many beneficial effects, it still has the following problems: although the two first pressure plates are moved closer to open the through hole, the sealing effect may be affected by various factors, such as the fitting precision between the first pressure plate and the rectangular plate, the elastic decay of the elastic element, etc. These factors may cause the sealing to be not tight, thereby affecting the filling effect and the ability to prevent liquid backflow.

[0004] Therefore, in view of the existing structure and deficiencies, a spray gun suction pipe for preventing liquid backflow is provided to achieve a more practical purpose. SUMMARY

[0005] (I) Technical problems solved

[0006] In view of the deficiencies of the prior art, the utility model provides a spray gun suction pipe for preventing liquid backflow, which solves the above problems.

[0007] (II) Technical solutions

[0008] In order to achieve the above-mentioned purposes, the utility model provides technical solutions as follows: a spray gun suction pipe preventing liquid backflow, comprising a suction pipe body, the middle part of the suction pipe body is provided with a flow stopping cavity, the other end top of the suction pipe body is provided with a suction port, the outer wall of the suction pipe body is fixedly provided with a drop speed adjusting disc, the outer wall of the drop speed adjusting disc is fixedly connected with a fixed block.

[0009] Preferably, the inner wall of the suction pipe body is fixedly connected with a fixed part, and the fixed part is in the shape of a cuboid.

[0010] Preferably, the other end of the fixed part is fixedly connected with a rod sleeve, and the inner part of the rod sleeve is fixedly connected with a valve rod.

[0011] Preferably, the outer wall of the valve rod is fixedly connected with a second valve flap, and the outer wall of the second valve flap is fixedly connected with a first valve flap.

[0012] Preferably, the inner diameter of the second valve flap is smaller than the inner diameter of the first valve flap, and the second valve flap is arranged on the inner wall of the first valve flap in a close manner.

[0013] Preferably, the outer wall of the valve rod is provided with a spring, the other end of the outer wall of the valve rod is slidingly connected with a movable shaft, and the side end of the movable shaft is fixedly connected with a sealing cover.

[0014] Preferably, the diameter of the sealing cover matches the diameter of the output end of the flow stopping cavity.

[0015] (Three) beneficial effects

[0016] Compared with the prior art, the utility model provides a spray gun suction pipe preventing liquid backflow, which has the following beneficial effects:

[0017] By arranging the flow stopping cavity in the middle part of the suction pipe body, fixedly connecting the cuboid-shaped fixed part on the inner wall of the suction pipe body, and further connecting the rod sleeve and the valve rod on the fixed part, the spray gun suction pipe realizes effective liquid backflow prevention function. When the suction pipe stops working, the valve rod and the first valve flap and the second valve flap thereon will closely adhere to the outlet of the flow stopping cavity under the action of the spring, forming a reliable sealing structure, effectively preventing the liquid from flowing back from the suction pipe. This design not only protects the normal work of the spray gun and the spraying system, but also avoids material waste and environmental pollution caused by liquid backflow. Through ingenious design, accurate adjustment of liquid drop speed is realized. On the outer wall of the suction pipe body, the user can adjust the drop speed of the liquid according to actual needs, so as to meet different spraying needs. In addition, the fixed block on the drop speed adjusting disc also provides stable support, ensuring the accuracy and reliability of drop speed adjustment. This design not only improves the flexibility and applicability of the spray gun suction pipe, but also provides users with more convenient and efficient spraying experience. Attached Figure Description

[0018] Fig. 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Fig. 2 This is a cross-sectional view of the internal structure of the suction tube body of this utility model;

[0020] Fig. 3 This is an enlarged schematic diagram of the internal structure of the flow-stopping cavity of this utility model.

[0021] In the diagram: 1. Suction pipe body; 2. Flow-stopping chamber; 3. Suction port; 4. Drip rate regulating disc; 5. Fixing block; 6. Fixing component; 7. Rod sleeve; 8. Valve stem; 9. First valve disc; 10. Second valve disc; 11. Spring; 12. Movable shaft; 13. Sealing cover. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figs. 1-3 A spray gun suction pipe for preventing liquid backflow includes a suction pipe body 1, a flow-stopping cavity 2 in the middle of the suction pipe body 1, a suction port 3 at the top of the other end of the suction pipe body 1, a drip rate regulating plate 4 fixedly installed on the outer wall of the suction pipe body 1, and a fixing block 5 fixedly connected to the outer wall of the drip rate regulating plate 4.

[0024] Furthermore, a fastener 6 is fixedly connected to the inner wall of the suction pipe body 1. The fastener 6 is in the shape of a cuboid. The design of the fastener not only provides a stable support for subsequent components such as valve stems and valve discs, but its cuboid shape also facilitates processing and installation, ensuring the stability and reliability of the entire suction pipe structure.

[0025] Furthermore, a rod sleeve 7 is fixedly connected to the other end of the fixing member 6, and a valve stem 8 is fixedly connected inside the rod sleeve 7. The design of the rod sleeve allows the valve stem to be stably fixed inside the suction pipe, avoiding valve stem shaking or displacement caused by liquid flow or external pressure. This helps to ensure the normal opening and closing of the valve disc, thereby maintaining the normal function of the suction pipe.

[0026] Further, the outer wall of the valve rod 8 is fixedly connected with the second valve disc 10, and the outer wall of the second valve disc 10 is fixedly connected with the first valve disc 9. Through the design of two layers of valve discs, the flow of the liquid can be more effectively controlled. When the liquid pressure changes, the two layers of valve discs can work cooperatively to ensure the tight closing of the flow-stopping cavity and prevent the backflow of the liquid. This design improves the backflow prevention performance of the suction pipe.

[0027] Further, the inner diameter of the second valve disc 10 is smaller than the inner diameter of the first valve disc 9, and the second valve disc 10 is arranged in a close-fitting manner on the inner wall of the first valve disc 9. This nested valve disc design not only enhances the strength and stability of the valve disc, but also enables the valve disc combination to form a tighter seal when closed. Since the inner diameter of the second valve disc is smaller, it can be more tightly fitted at the outlet of the flow-stopping cavity, effectively preventing liquid leakage.

[0028] Further, the outer wall of the valve rod 8 is provided with a spring 11, and the other end of the outer wall of the valve rod 8 is slidably connected with a movable shaft 12, and the side end of the movable shaft 12 is fixedly connected with a sealing cover 13. The spring provides the necessary restoring force for the valve rod, so that the valve disc combination can quickly return to the closed state after the liquid pressure disappears. At the same time, the design of the movable shaft and the sealing cover further enhances the sealing performance of the flow-stopping cavity. When the valve disc is closed, the sealing cover can tightly fit at the outlet of the flow-stopping cavity to prevent backflow and leakage of the liquid.

[0029] Further, the diameter of the sealing cover 13 matches the diameter of the output end of the flow-stopping cavity 2. The diameter of the sealing cover matches the diameter of the output end of the flow-stopping cavity, ensuring that the sealing cover can completely cover the outlet of the flow-stopping cavity when closed. This design not only improves the sealing performance, but also avoids the problem of liquid leakage caused by poor sealing.

[0030] Working principle: when the spray gun starts to work, the suction port 3 generates negative pressure, attracting the liquid to flow along the suction pipe body 1, when the liquid flows, it will push the valve rod 8 and the first valve flap 9 and the second valve flap 10 on it, because the inner diameter of the second valve flap 10 is smaller than that of the first valve flap 9, and the second valve flap 10 is attached to the inner wall of the first valve flap 9, this design can ensure that the valve flap combination can be stably kept in the open state when the liquid flows, without hindering the flow of the liquid, at the same time, the spring 11 is in the compressed state, providing a certain reverse pressure for the valve rod 8, but not enough to prevent the normal flow of the liquid, when the spray gun stops working, the negative pressure of the suction port 3 disappears, the liquid begins to have the tendency of backflow under the pressure in the pipeline, at this time, the spring 11 begins to release its stored energy, pushing the valve rod 8 and the valve flap combination on it to the direction of the flow stopping cavity 2, because of the attachment design of the second valve flap 10 and the first valve flap 9, and the pushing action of the spring 11, the valve flap combination can quickly and tightly close the output end of the flow stopping cavity 2, so as to effectively prevent the backflow of the liquid, at the same time, the movable shaft 12 and the sealing cover 13 fixed on the side end also play an auxiliary role, the diameter of the sealing cover matches the diameter of the output end of the flow stopping cavity, ensuring that when the valve flap combination is closed, the sealing cover can be tightly attached to the outlet of the flow stopping cavity, further enhancing the anti-backflow effect.

[0031] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A liquid backflow preventing spray gun suction tube comprising a suction tube body (1), characterized in that: The middle part of the suction pipe body (1) is provided with a flow stopping cavity (2), the other end top of the suction pipe body (1) is provided with a suction port (3), the outer wall of the suction pipe body (1) is fixedly provided with a drop speed adjusting disc (4), and the outer wall of the drop speed adjusting disc (4) is fixedly connected with a fixed block (5).

2. A liquid backflow preventing gun suction tube according to claim 1, characterized in that: The inner wall of the suction pipe body (1) is fixedly connected with a mounting block (6), and the mounting block (6) is in the shape of a cuboid.

3. A liquid backflow preventing lancesuction tube according to claim 2, characterized in that: The other end of the fixing part (6) is fixedly connected with a rod sleeve (7), and the inner part of the rod sleeve (7) is fixedly connected with a valve rod (8).

4. A liquid backflow preventing gun suction tube according to claim 3, characterized in that: The outer wall of the valve rod (8) is fixedly connected with a second valve clack (10), and the outer wall of the second valve clack (10) is fixedly connected with a first valve clack (9).

5. A liquid backflow preventing spray gun suction tube according to claim 4, wherein: The inner diameter of the second valve clack (10) is smaller than that of the first valve clack (9), and the second valve clack (10) is arranged in the shape of adhesion on the inner wall of the first valve clack (9).

6. A liquid backflow preventing gun hose as defined in claim 3 wherein: The outer wall of the valve rod (8) is provided with a spring (11), the other end outer wall of the valve rod (8) is slidably connected with a movable shaft (12), and the side end of the movable shaft (12) is fixedly connected with a sealing cover (13).

7. A liquid backflow preventing spray gun suction tube according to claim 6, wherein: The diameter of the sealing cover (13) matches the diameter of the output end of the flow stopping cavity (2).

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