A reflux valve assembly for a spraying machine

Abstract

The utility model belongs to the field of spraying machine equipment, and provides a reflux valve assembly for a spraying machine, comprising: a valve housing, one end of the valve housing is provided with a reflux inlet, and a side wall of the valve housing is provided with a reflux outlet connected with the reflux inlet; a core rod is movably connected in the valve housing, one end of the core rod is connected with a ball, and the ball is on the reflux inlet; a positioning block is sleeved in the valve housing and on the outside of the core rod, a slope groove is upwardly provided on the lower end face of the positioning block along the circumferential direction, a limit pin is connected to the core rod in the radial direction, and the limit pin is in the slope groove; the core rod rotates and moves toward the reflux inlet under the interference of the limit pin and the slope groove, and the ball interferes with the reflux inlet under the action of the core rod, and the reflux inlet is closed; through mechanical cooperation, the opening and closing between the ball and the reflux inlet is more controllable, and the stability of the seal is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of valve bodies for spraying machines, in particular to a reflux valve assembly for spraying machines. Background Art

[0002] In the application of spraying machines, the reflux valve is one of the key components. Its main function is to open before the spraying machine is turned on to exhaust the air in the machine and ensure the stability and accuracy of the spraying process. The existing reflux valve structure is relatively simple, usually including a valve body, a valve core, a spring and a seal. Although this structure can meet basic spraying needs, it is insufficient in performance and stability:

[0003] The traditional reflux valve mainly relies on the elastic force adjustment of the spring and the valve core, which cannot guarantee the stability of the seal. Moreover, after long-term use, the existing reflux valve will suffer from severe wear between the valve core and the valve seat, and the sealing performance will decrease, which may easily lead to liquid leakage.

[0004] The traditional reflux valve is prone to wear and tear during frequent switching operations, which affects its service life and reliability. Frequent maintenance and replacement not only increase the cost of use, but also affect the continuity of production. Utility Model Content

[0005] The utility model discloses a reflux valve assembly for a spraying machine, which is used to solve relevant technical problems in the background technology.

[0006] The technical solution provided by the utility model is as follows: a reflux valve assembly for a spraying machine, comprising: a valve housing, one end of the valve housing having a reflux inlet, a side wall of the valve housing having a reflux outlet connected to the reflux inlet; a core rod movably connected in the valve housing, one end of the core rod being connected to a ball, the ball being on the reflux inlet;

[0007] A positioning block is sleeved on the outside of the core rod in the valve housing, and a slope groove is opened upward along the circumferential direction on the lower end surface of the positioning block. A limit pin is connected to the core rod in the radial direction, and the limit pin is in the slope groove;

[0008] The core rod rotates and moves toward the reflux inlet under the interference of the limit pin and the slope groove. The ball contacts the reflux inlet under the action of the core rod to close the reflux inlet.

[0009] In one embodiment, a tungsten steel ring matched with a ball is provided at the reflux inlet and outlet, and the tungsten steel ring is fixed in the valve housing by a double threaded joint.

[0010] In one embodiment, the inner hole edge of the tungsten steel ring that contacts the sphere has a chamfer.

[0011] In one embodiment, a sealing ring is provided between the core rod and the valve housing, and the sealing ring is on the reflux inlet and the reflux outlet.

[0012] In one embodiment, a cap is connected to one end of the valve housing away from the reflux inlet, and the cap is sleeved on the outside of the core rod.

[0013] In one embodiment, a mounting groove is opened inwardly at the end of the core rod, a part of the sphere is clamped in the mounting groove, and the other part is outside the mounting groove for closing the reflux inlet.

[0014] In one embodiment, the end of the core rod away from the spherical body is connected to a trigger, and the trigger is sleeved outside one end of the valve housing.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model discloses a reflux valve assembly for a spraying machine. When the core rod rotates, the core rod moves toward the reflux inlet under the cooperation of the slope groove and the limit pin. The ball contacts the reflux inlet under the action of the core rod to close the reflux inlet. Through mechanical cooperation, the opening and closing between the ball and the reflux inlet is more controllable, thereby ensuring the stability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the external three-dimensional structure of the reflux valve assembly of the utility model;

[0018] Figure 2 It is a cross-sectional view of the reflux valve assembly of the utility model;

[0019] Figure 3 It is a schematic diagram of the structure of the connection between the limit pin and the slope groove in the utility model;

[0020] Figure 4 It is a structural schematic diagram of the positioning block in the utility model.

[0021] The accompanying drawings are marked as follows: 1. valve body; 2. reflux inlet; 3. reflux outlet; 4. core rod; 5. mounting groove; 6. ball; 7. positioning block; 8. slope groove; 9. limit pin; 10. tungsten steel ring; 11. double threaded joint; 12. sealing ring; 13. cap; 14. trigger. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0023] like Figure 1-4 As shown, the utility model is a reflux valve assembly for a spraying machine, comprising: a valve housing 1, a core rod 4, a positioning block 7, a limit pin 9, and a ball 6;

[0024] In this embodiment, the valve housing 1 is a cylindrical structure, one end of which is a reflux inlet 2 for connecting to the equipment; a reflux outlet 3 is provided on the peripheral side wall thereof, and the reflux outlet 3 is connected to the reflux inlet 2 for discharging air in the equipment and reflux paint, etc.; the positioning block 7 of this embodiment is an annular structure, which is installed in the valve housing 1, and two arc-shaped slope grooves 8 are provided in the lower end surface thereof; the core rod 4 is movably placed in the valve housing 1 and passes through the positioning block 7; one end of the core rod 4 protrudes outside the valve housing 1, and one end is connected to the ball 6, and the ball 6 is between the reflux inlet 2 and the reflux outlet 3, and the core rod 4 is radially connected to Limit pins 9 protrude on both sides of the core rod 4, and the limit pins 9 are in the slope groove 8; when the core rod 4 rotates, with the cooperation of the slope groove 8 and the limit pins 9, the core rod 4 moves toward the reflux inlet 2, and the ball 6 contacts the reflux inlet 2 under the action of the core rod 4, closing the reflux inlet 2; when the core rod 4 rotates in the opposite direction, with the cooperation of the slope groove 8 and the limit pins 9, the core rod 4 drives the ball 6 away from the reflux inlet 2, thereby opening the reflux inlet 2 so that it can be exhausted or discharged; through mechanical cooperation, the opening and closing between the ball 6 and the reflux inlet 2 is more controllable, ensuring the stability of the seal.

[0025] In this embodiment, a stepped mounting structure is provided in the valve housing 1, the positioning block 7 is installed in the stepped mounting structure, and the limit pin 9 moves up and down in the stepped mounting structure as the slope of the slope groove 8 changes.

[0026] The slope groove 8 of this embodiment is arc-shaped and has a slope in the up and down directions. Therefore, when the core rod 4 rotates, the limit pin 9 rotates along the slope groove. When it rotates to a shallow slope, the core rod 4 is pushed downward to seal the ball 6. When it rotates to a deep slope, the ball 6 is in a non-compression sealing state and can be lifted up by gas or liquid.

[0027] In this embodiment, a mounting groove 5 is opened inwardly at the end of the core rod 4, a part of the ball 6 is clamped in the mounting groove 5, and the other part is outside the mounting groove 5 for closing the reflux inlet 2; by clamping the ball 6 in the mounting groove 5, the ball 6 can be prevented from being offset, the relative position of the ball 6 is ensured, and the sealing and stability are improved.

[0028] In the present embodiment, a tungsten steel ring 10 is clamped in the valve housing 1, which is used to cooperate with the ball 6 at the reflux inlet 2 to realize the opening and closing of the reflux inlet 2; by providing the tungsten steel ring 10, the ball 6 is avoided from directly sealing with the valve housing 1, the wear of the valve housing 1 is reduced, the service life of the equipment is increased, and the maintenance cost is reduced; and the double threaded joint 11 is screwed on the valve housing 1, which can not only squeeze and fix the tungsten steel ring 10, but also connect the reflux valve of the present embodiment to the spraying machine equipment, thereby improving the efficiency of removing and replacing the tungsten steel ring 10 and ensuring the installation between the valve body and the equipment.

[0029] Furthermore, the inner hole edge of the tungsten steel ring 10 that contacts the sphere 6 has a chamfer, and the chamfered surface is tangentially sealed with the outside of the sphere 6, thereby reducing the wear of the tungsten steel ring 10 and improving the sealing between the tungsten steel ring 10 and the sphere 6.

[0030] In this embodiment, a sealing ring 12 is provided on the core rod 4 connected to the valve housing 1. The sealing ring 12 is on the reflux inlet 2 and the reflux outlet 3 to ensure that the gas and liquid in the reflux inlet 2 are discharged from the reflux outlet 3, avoiding leakage from the connection between the core rod 4 and the valve housing 1, thereby ensuring the stability of the equipment.

[0031] In this embodiment, one end of the valve housing 1 away from the reflux inlet 2 is connected to a cap 13 , and the cap 13 is sleeved on the outside of the core rod 4 , so that the end of the valve housing 1 can be covered by the cap 13 .

[0032] In this embodiment, the end of the core rod 4 away from the sphere 6 is connected to a trigger 14, and the trigger 14 is sleeved on the outside of one end of the valve housing 1; the outside of the core rod 4 has a polygonal structure, and the center of the trigger 14 is provided with a hole that matches the trigger 14, which is sleeved on the outside of the polygonal structure, and the core rod 4 can be rotated by the trigger 14.

[0033] Working principle: The reflux valve assembly of this embodiment is installed on the spraying machine equipment through the double threaded joint 11. Before the equipment is turned on, the core rod 4 is rotated by the trigger 14. With the cooperation of the slope groove 8 and the limit pin 9, the core rod 4 drives the ball 6 away from the reflux inlet 2, and the ball 6 is in a non-pressed sealing state, thereby opening the reflux inlet 2 so that it can be exhausted or discharged; when the discharge begins, the core rod 4 is rotated again by the trigger 14. With the cooperation of the slope groove 8 and the limit pin 9, the core rod 4 drives the ball 6 to move toward the reflux inlet 2, so that the ball 6 and the tungsten steel ring 10 are squeezed and sealed. Through mechanical cooperation, the opening and closing between the ball 6 and the reflux inlet 2 is more controllable, ensuring the stability of the seal.

[0034] In this application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0035] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A reflux valve assembly for a spraying machine, characterized in that: include: A valve housing (1), wherein one end of the valve housing (1) is provided with a reflux inlet (2), and a side wall of the valve housing (1) is provided with a reflux outlet (3) connected to the reflux inlet (2); a core rod (4) is movably connected inside the valve housing (1), one end of the core rod (4) is connected to a ball (6), and the ball (6) is on the reflux inlet (2); A positioning block (7) is sleeved inside the valve housing (1) and outside the core rod (4); an arc-shaped slope groove (8) is formed inwardly on the lower end surface of the positioning block (7); a limit pin (9) is radially connected to the core rod (4); and the limit pin (9) is in the slope groove (8); The core rod (4) rotates and moves toward the reflux inlet (2) under the interference of the limit pin (9) and the slope groove (8); the ball (6) contacts the reflux inlet (2) under the action of the core rod (4), thereby closing the reflux inlet (2).

2. A reflux valve assembly for a spraying machine as claimed in claim 1, characterized in that: A tungsten steel ring (10) matched with the sphere (6) is provided at the reflux inlet (2), and the tungsten steel ring (10) is fixed in the valve housing (1) by a double threaded joint (11).

3. A reflux valve assembly for a spraying machine as claimed in claim 2, characterized in that: The inner hole edge of the tungsten steel ring (10) that contacts the sphere (6) has a chamfer.

4. A reflux valve assembly for a spraying machine as claimed in claim 1, characterized in that: The core rod (4) is connected to the valve housing (1) and is provided with a sealing ring (12), and the sealing ring (12) is on the reflux inlet (2) and the reflux outlet (3).

5. A reflux valve assembly for a spraying machine as claimed in claim 1, characterized in that: One end of the valve housing (1) away from the reflux inlet (2) is connected to a cap (13), and the cap (13) is sleeved on the outside of the core rod (4).

6. A reflux valve assembly for a spraying machine as claimed in claim 1, characterized in that: The end of the core rod (4) is provided with a mounting groove (5) inwardly, a part of the sphere (6) is clamped in the mounting groove (5), and the other part is outside the mounting groove (5) for closing the reflux inlet (2).

7. A reflux valve assembly for a spraying machine as claimed in claim 1, characterized in that: The end of the core rod (4) away from the ball (6) is connected to a trigger (14), and the trigger (14) is sleeved outside one end of the valve housing (1).

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