Double-combination sealing structure for plunger rod of airless sprayer

Abstract

The utility model discloses an airless sprayer plunger rod double-combination sealing structure, which relates to the airless sprayer field, and comprises a plunger rod and a plunger pump body, the plunger pump body is provided with a liquid inlet and a liquid outlet, the plunger rod reciprocates in the plunger pump body, paint is conveyed from the liquid inlet to the liquid outlet, and the plunger rod is connected with the plunger pump body. The outer wall of the plunger rod is sequentially sleeved with a first plunger sleeve, a first sealing ring assembly, a second plunger sleeve and a second sealing ring assembly from top to bottom, the first plunger sleeve is pressed through a plunger rod threaded sleeve connected to the plunger pump body, and the plunger rod is coaxially positioned through the first plunger sleeve and the second plunger sleeve. On the basis of the prior art, a set of sealing ring assembly and the plunger sleeve are additionally arranged, double protection is formed, the sealing effect is better, leakage is not prone to occurring, the durability of the plunger rod is improved, and the service life of the airless sprayer is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of airless spraying machines, in particular to a double-combination sealing structure of a plunger rod of an airless spraying machine. Background Art

[0002] An airless sprayer is a spraying device that uses a plunger pump to pressurize the paint. The high-pressure paint is transported to the spray gun through a high-pressure hose, and the pressure is released through the nozzle to form atomization, thereby forming a dense coating on the wall surface. The pressure of the paint in the plunger pump is usually 6 to 30Mpa. The plunger rod is driven by the motor, eccentric wheel, connecting rod and other components to make reciprocating motion. At this time, the paint will act on the sealing ring assembly due to the high pressure. Under the conditions of high pressure, wear and long-term use, the paint is likely to leak at the sealing assembly. In addition, the plunger rod in the existing plunger pump is positioned only by a plunger sleeve, which is prone to deviation, resulting in increased wear of the plunger rod and damage and scrapping. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a double-combination sealing structure for the plunger rod of an airless sprayer. On the basis of the existing technology, a set of sealing ring components and a plunger sleeve are added to form double protection, which has a better sealing effect and is not prone to leakage, thereby improving the durability of the plunger rod and extending the service life of the airless sprayer.

[0004] The purpose of the utility model is achieved through the following technical solutions: this airless sprayer plunger rod double combined sealing structure includes a plunger rod and a plunger pump body, the plunger pump body is provided with a liquid inlet and a liquid outlet, the plunger rod reciprocates in the plunger pump body to transport the paint from the liquid inlet to the liquid outlet, the outer wall of the plunger rod is sequentially sleeved with a first plunger sleeve, a first sealing ring assembly, a second plunger sleeve and a second sealing ring assembly from top to bottom, the first plunger sleeve is pressed by a plunger rod screw sleeve connected to the plunger pump body, and the first plunger sleeve and the second plunger sleeve coaxially position the plunger rod.

[0005] As a further technical solution, the first sealing ring assembly and the second sealing ring assembly each include a lip sealing ring and an O-ring, and the lip sealing ring is interference fit with the outer wall of the plunger rod.

[0006] As a further technical solution, a step is provided on the inner wall of the plunger pump body for positioning and installing the second plunger sleeve.

[0007] As a further technical solution, the plunger rod threaded sleeve is threadedly connected to the plunger pump body, and the first plunger sleeve is embedded in the plunger rod threaded sleeve.

[0008] The beneficial effects of the utility model are:

[0009] 1. Two sets of sealing ring components are set between the plunger rod and the plunger pump body to form a two-line sealing structure. Even if the paint leaks from the first seal, the second seal does not directly contact the paint, so the pressure will not increase and the wear will not be too large, ensuring the reliability of the seal and forming a double guarantee;

[0010] 2. The plunger rod is doubly positioned by the first plunger sleeve and the second plunger sleeve, with higher positioning accuracy. The plunger rod is not easily misaligned during reciprocating motion, which can reduce the occurrence of excessive wear and failure of the plunger rod due to eccentricity of the plunger rod;

[0011] 3. Both the first and second sealing ring assemblies include a lip sealing ring and an O-ring, and the lip of the lip sealing ring is interference fit with the plunger rod, so the sealing performance is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the airless sprayer in the utility model.

[0013] Figure 2 for Figure 1 AA section view.

[0014] Figure 3 It is a structural schematic diagram of the plunger pump body in the utility model.

[0015] Figure 4 for Figure 3 BB cross-sectional view.

[0016] Figure 5 for Figure 4 A partial enlarged schematic diagram of the C area in the middle.

[0017] Explanation of the accompanying drawings: plunger rod 1, plunger rod sleeve 2, first plunger sleeve 3, first sealing ring assembly 4, second plunger sleeve 5, second sealing ring assembly 6, plunger pump body 7, coating 8, liquid inlet 9, liquid outlet 10, liquid inlet pipe 11, liquid outlet pipe 12, lip sealing ring 13, O-ring 14, step 15. DETAILED DESCRIPTION

[0018] The utility model will be described in detail below with reference to the accompanying drawings:

[0019] Example: As attached Figures 1 to 5 As shown, the double-combination sealing structure of the airless sprayer plunger rod includes a plunger rod 1, a plunger rod screw sleeve 2, a first plunger sleeve 3, a first sealing ring assembly 4, a second plunger sleeve 5, a second sealing ring assembly 6, a plunger pump body 7, a coating material 8, a liquid inlet 9, a liquid outlet 10, a liquid inlet pipe 11, a liquid outlet pipe 12, a lip seal ring 13, an O-ring 14 and a step 15.

[0020] Reference Figure 3 ,4 A liquid inlet 9 and a liquid outlet 10 are provided on the plunger pump body 7, and the liquid inlet 9 and the liquid outlet 10 are connected through the inner cavity of the plunger pump body 7. Driven by the external motor, eccentric wheel, connecting rod and other components, the plunger rod 1 reciprocates along the inner wall of the plunger pump body 7 to transport the paint 8 from the liquid inlet 9 to the liquid outlet 10. Preferably, a one-way valve is provided at appropriate positions on the liquid inlet 9 and the liquid outlet 10 to ensure that the paint 8 flows in one direction in the plunger pump body 7. Figure 1 , 2 As shown, the liquid inlet 9 is connected to a liquid inlet pipe 11 , and the liquid outlet 10 is connected to a liquid outlet pipe 12 .

[0021] Furthermore, the first plunger sleeve 3, the first sealing ring assembly 4, the second plunger sleeve 5 and the second sealing ring assembly 6 are sequentially sleeved on the outer wall of the plunger rod 1 from top to bottom, the first plunger sleeve 3 is embedded in the plunger rod screw sleeve 2, and the plunger rod screw sleeve 2 is fixed to the plunger pump body 7 by threaded connection, so that the first plunger sleeve 3 is pressed relative to the first sealing ring assembly 4, and the first plunger sleeve 3 and the second plunger sleeve 5 coaxially position the plunger rod 1. Under double positioning, the positioning accuracy is higher, and the plunger rod 1 is not easy to deviate during reciprocating motion, which can reduce the occurrence of excessive wear and failure of the plunger rod 1 due to the eccentricity of the plunger rod 1.

[0022] like Figure 4 , 5 As shown, the first sealing ring assembly 4 and the second sealing ring assembly 6 each include a lip sealing ring 13 and an O-ring 14, and the lip sealing ring 13 is interference fit with the outer wall of the plunger rod 1, so the sealing effect is better. Two sets of sealing ring assemblies form a two-line sealing structure. Even if the paint leaks from the first sealing part, since the second sealing part does not directly contact the paint, the pressure will not increase and the wear will not be too large, thus ensuring the reliability of the seal and forming a double guarantee.

[0023] Preferably, a step 15 is provided on the inner wall of the plunger pump body 7 to position and install the second plunger sleeve 5 .

[0024] The working process of this utility model:

[0025] When the plunger pump is working, the paint 8 will act on the second sealing ring assembly 6 due to high pressure. Under the conditions of high pressure, wear and long-term use, the paint 8 is easy to leak at the second sealing ring assembly 6. After passing through the second plunger sleeve 5, since there is no direct contact with the paint 8 at the first sealing ring assembly 4, the pressure will not increase, and the wear of the plunger rod 1 will not be too large, so the paint 8 will stop leaking at the first sealing ring assembly 4. In addition, the first plunger sleeve 3 and the second plunger sleeve 5 are both coaxially sleeved on the plunger rod 1. Under double positioning, the plunger rod 1 is not easy to deviate, which can reduce the excessive wear of the plunger rod 1 caused by the eccentricity of the plunger rod 1, thereby greatly extending the service life of the plunger pump (airless sprayer).

[0026] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and the concept of the utility model should fall within the protection scope of the claims attached to the utility model.

Claims

1. A double-combination sealing structure of a plunger rod of an airless sprayer, comprising a plunger rod (1) and a plunger pump body (7), wherein the plunger pump body (7) is provided with a liquid inlet (9) and a liquid outlet (10), and the plunger rod (1) reciprocates in the plunger pump body (7) to transport paint (8) from the liquid inlet (9) to the liquid outlet (10), characterized in that: The outer wall of the plunger rod (1) is sleeved with a first plunger sleeve (3), a first sealing ring assembly (4), a second plunger sleeve (5) and a second sealing ring assembly (6) in sequence from top to bottom; the first plunger sleeve (3) is compressed by a plunger rod screw sleeve (2) connected to a plunger pump body (7); the first plunger sleeve (3) and the second plunger sleeve (5) are coaxially positioned with respect to the plunger rod (1).

2. The double-combination sealing structure of the plunger rod of an airless sprayer according to claim 1 is characterized in that: The first sealing ring assembly (4) and the second sealing ring assembly (6) each comprise a lip sealing ring (13) and an O-ring (14), and the lip sealing ring (13) is interference fit with the outer wall of the plunger rod (1).

3. The double-combination sealing structure of the plunger rod of an airless sprayer according to claim 1, characterized in that: A step (15) is provided on the inner wall of the plunger pump body (7) for positioning and installing the second plunger sleeve (5).

4. The double-combination sealing structure of the plunger rod of an airless sprayer according to claim 1, characterized in that: The plunger rod screw sleeve (2) is threadedly connected to the plunger pump body (7), and the first plunger sleeve (3) is embedded in the plunger rod screw sleeve (2).

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