Pressure-adjustable structure of plunger spraying machine

Abstract

The utility model discloses a pressure-adjustable structure of a plunger spraying machine, which relates to the field of spraying machines and comprises an adjusting screw and the like, a pressure maintaining channel communicated with a liquid outlet channel is arranged in a plunger pump shell, a switch shell is fixed with the plunger pump shell, a microswitch is pressed in the switch shell, and a pressure protection screw sleeve extends into the switch shell; one end of the pressure protection valve rod extends into the pressure maintaining channel, the other end of the pressure protection valve rod penetrates through the pressure protection threaded sleeve to be located above the microswitch and used for abutting against a switch button of the microswitch, the microswitch controls the plunger spraying machine to work through electric connection, and a spring is arranged between the pressure protection valve rod and the pressure protection threaded sleeve. The pressure protection valve rod slides up and down along the inner wall of the pressure maintaining channel; one end of the adjusting screw is connected to the switch shell, the other end of the adjusting screw abuts against the microswitch, and the adjusting screw is used for pushing the microswitch and adjusting the distance between the pressure protection valve rod and the switch button. The set pressure of the pressure protection device can be adjusted, so that the pressure protection device is suitable for wide application scenes.

Description

Technical Field

[0001] The utility model relates to the field of spraying machines, in particular to an adjustable pressure structure of a plunger 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 existing airless sprayers is usually 6 to 30Mpa. In order to ensure safety during spraying, a micro switch for pressure protection is usually set on the plunger pump. However, the set pressure of the pressure protection device is usually a fixed value and cannot be adjusted according to actual conditions, which limits the application scenarios. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide an adjustable pressure structure for a plunger sprayer, which can adjust the set pressure of a pressure protection device to adapt to a wide range of application scenarios.

[0004] The purpose of the utility model is to achieve the following technical solutions: the adjustable pressure structure of the plunger sprayer includes a plunger pump housing, a liquid outlet channel is opened in the plunger pump housing, the end of the liquid outlet channel is connected to the spray gun of the plunger sprayer through the liquid outlet, and also includes an adjusting screw, a micro switch, a switch housing, a pressure protection valve stem and a pressure protection screw sleeve, a pressure-maintaining channel connected to the liquid outlet channel is opened in the plunger pump housing, the switch housing is fixed to the plunger pump housing, the micro switch is press-fitted in the switch housing, the pressure protection screw sleeve is fixed to the plunger pump housing and extends into The pressure protection valve stem is in the switch shell; one end of the pressure protection valve stem extends into the pressure maintaining channel, and the other end of the pressure protection valve stem passes through the pressure protection screw sleeve and is located above the micro switch, which is used to resist the switch button of the micro switch. The micro switch controls the operation of the plunger sprayer through electrical connection. A spring is arranged between the pressure protection valve stem and the pressure protection screw sleeve to make the pressure protection valve stem slide up and down along the inner wall of the pressure maintaining channel; one end of the adjusting screw is connected to the switch shell and the other end is against the micro switch, which is used to push the micro switch and adjust the distance between the pressure protection valve stem and the switch button.

[0005] As a further technical solution, an adjustment hole is provided on the switch housing, and an adjustment screw is threadedly connected to the adjustment hole.

[0006] As a further technical solution, the switch housing is formed by buckling together two parts, an upper part and an lower part, which are fixed by a locking screw.

[0007] As a further technical solution, pin holes are provided at corresponding positions on the micro switch and the switch shell. After the micro switch is placed in the switch shell, the pin is passed through the switch shell and the pin holes on the micro switch in sequence to position the micro switch and the switch shell; when the adjusting screw pushes the micro switch, the micro switch rotates around the pin, thereby changing the distance between the pressure protection valve stem and the switch button.

[0008] As a further technical solution, the distance between the pressure protection valve stem and the switch button can be adjusted in the range of 0 to 8 mm.

[0009] As a further technical solution, a guide sleeve is arranged on the inner wall of the pressure maintaining channel, and a gasket is arranged between the pressure protection screw sleeve and the inner wall of the plunger pump housing. After the pressure protection screw sleeve and the plunger pump housing are locked, the guide sleeve is pressed by the gasket.

[0010] As a further technical solution, the outer wall of the pressure protection valve stem is installed with a pressure protection O-ring and a gasket in sequence from top to bottom to cooperate with the guide sleeve sliding seal.

[0011] As a further technical solution, a step is provided on the outer wall of the pressure protection valve stem to cooperate with the gasket and the pressure protection screw sleeve to limit the upward and downward sliding stroke of the pressure protection valve stem.

[0012] The beneficial effects of the utility model are:

[0013] 1. Push the micro switch by adjusting the screw to adjust the distance between the pressure protection valve stem and the switch button, so as to adjust the set pressure of the pressure protection device, which has a wider range of applications;

[0014] 2. The micro switch and the switch housing are positioned by a latch to prevent the micro switch from shaking during use. At the same time, when the adjustment screw pushes the micro switch, the micro switch can rotate around the latch to achieve distance adjustment within a small range;

[0015] 3. The pressure protection valve stem and the guide sleeve slide seal to prevent the paint from leaking from the pressure maintaining channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0017] Figure 2 It is a schematic diagram of the main structure of the utility model.

[0018] Figure 3 for Figure 2 KK cross-sectional view.

[0019] Figure 4 for Figure 3 A partial enlarged schematic diagram of area A in the middle.

[0020] Explanation of the accompanying drawings: adjusting screw 1, micro switch 2, switch housing 3, pressure protection valve stem 4, spring 5, gasket 6, guide sleeve 7, washer 8, pressure protection O-ring 9, latch 10, plunger pump housing 11, liquid outlet channel 12, liquid outlet 13, pressure maintaining channel 14, pressure protection screw sleeve 15, locking screw 16, latch hole 17, adjustment hole 18, switch button 19, adjustment cabin 20. DETAILED DESCRIPTION

[0021] The utility model will be described in detail below with reference to the accompanying drawings:

[0022] Example: As shown in the attached Figures 1 to 4 As shown, the adjustable pressure structure of the plunger sprayer includes an adjusting screw 1, a micro switch 2, a switch housing 3, a pressure protection valve stem 4, a spring 5, a gasket 6, a guide sleeve 7, a gasket 8, a pressure protection O-ring 9, a latch 10, a plunger pump housing 11, a liquid outlet channel 12, a liquid outlet 13, a pressure maintaining channel 14, a pressure protection screw sleeve 15, a locking screw 16, a latch hole 17, an adjusting hole 18, a switch button 19 and an adjusting cabin 20.

[0023] Reference Figure 2 , 3 A liquid outlet channel 12 is opened in the plunger pump housing 11, and the end of the liquid outlet channel 12 is connected to the spray gun of the plunger sprayer through the liquid outlet port 13. A pressure maintaining channel 14 connected to the liquid outlet channel 12 is also opened in the plunger pump housing 11. Preferably, the pressure maintaining channel 14 is perpendicular to the liquid outlet channel 12.

[0024] like Figure 3 , 4 As shown, the switch housing 3 is formed by buckling the upper and lower parts, and the upper and lower parts are fixed by four locking screws 16 during assembly. After buckling, the switch housing 3 is fixedly connected to the lower part of the plunger pump housing 11, so that the micro switch 2 is pressed into the switch housing 3. Preferably, an adjustment cabin 20 is opened in the switch housing 3, and the micro switch 2 is placed in the adjustment cabin 20. After the pressure protection screw sleeve 15 is threadedly connected and fixed to the plunger pump housing 11, it extends into the switch housing 3 (located above the adjustment cabin 20).

[0025] Further, such as Figure 4As shown, the upper end of the pressure protection valve stem 4 extends into the pressure maintaining channel 14, and the lower end of the pressure protection valve stem 4 passes through the pressure protection screw sleeve 15 and is located above the micro switch 2. Under the pressure in the liquid outlet channel 12 (pressure maintaining channel 14), the pressure protection valve stem 4 slides downward and contacts the switch button 19 of the micro switch 2. The micro switch 2 controls the operation of the motor of the plunger sprayer through electrical connection, thereby achieving automatic adjustment according to the pressure. A spring 5 is arranged between the pressure protection valve stem 4 and the pressure protection screw sleeve 15, so that the pressure protection valve stem 4 slides up and down along the inner wall of the pressure maintaining channel 14. Preferably, a step is arranged on the outer wall of the pressure protection valve stem 4, which can cooperate with the gasket 6 and the pressure protection screw sleeve 15 to limit the sliding stroke of the pressure protection valve stem 4 up and down.

[0026] Preferably, one end of the adjusting screw 1 is threadedly connected to the switch housing 3, and the other end is against the micro switch 2, so as to push the micro switch 2 and adjust the distance between the pressure protection valve stem 4 and the switch button 19. An adjusting hole 18 is provided at the lower part of the switch housing 3, and the adjusting screw 1 is threadedly connected to the adjusting hole 18. The micro switch 2 and the switch housing 3 are provided with a latch hole 17 at the corresponding position. After the micro switch 2 is placed in the switch housing 3 (adjustment cabin 20), the latch 10 is sequentially passed through the latch holes 17 on the switch housing 3 and the micro switch 2, so that the micro switch 2 and the switch housing 3 are positioned. When the adjusting screw 1 pushes the micro switch 2, the micro switch 2 starts to rotate around the latch 10 in a small range, thereby changing the distance between the pressure protection valve stem 4 and the switch button 19. In actual use, the distance between the pressure protection valve stem 4 and the switch button 19 is adjusted in a range of 0 to 8 mm, so as to achieve distance adjustment in a small range, and correspondingly adjust the trigger pressure of the micro switch 2.

[0027] A guide sleeve 7 is arranged on the inner wall of the pressure-maintaining channel 14, and a gasket 6 is arranged between the pressure protection screw sleeve 15 and the inner wall of the plunger pump housing 11. After the pressure protection screw sleeve 15 and the plunger pump housing 11 are locked, the guide sleeve 7 is pressed by the gasket 6 to prevent the guide sleeve 7 from moving up and down. Two grooves are arranged on the outer wall of the pressure protection valve stem 4, and the pressure-maintaining O-ring 9 and the gasket 8 are installed in the grooves from top to bottom in sequence to cooperate with the guide sleeve 7 to achieve sliding sealing.

[0028] The working process of this utility model:

[0029] During assembly, first place the micro switch 2 into the adjustment compartment 20 of the switch housing 3 (lower half), then buckle the switch housing 3 (upper half) to connect the switch housing 3 with the plunger pump housing 11, then sequentially pass the latch 10 through the latch holes 17 on the switch housing 3 and the micro switch 2 to position the micro switch 2 with the switch housing 3, and finally lock and secure the switch housing 3 with four locking screws 16.

[0030] During operation, the paint in the liquid outlet channel 12 enters the pressure-maintaining channel 14 and presses on the upper end of the pressure protection valve stem 4, pushing the pressure protection valve stem 4 downward and compressing the spring 5. When the pressure reaches the set value, the lower end of the pressure protection valve stem 4 hits the switch button 19 of the micro switch 2, disconnecting the switch and stopping the plunger pump. When the pressure is insufficient and cannot hit the micro switch 2, the plunger pump automatically starts to run. When the pressure needs to be adjusted, the micro switch 2 is pushed by the adjusting screw 1, so that the micro switch 2 starts to rotate around the pin 10 in a small range, thereby changing the distance between the pressure protection valve stem 4 and the switch button 19. A longer distance corresponds to an increase in the set pressure, and a closer distance corresponds to a decrease in the set pressure.

[0031] 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 plunger sprayer pressure-adjustable structure, comprising a plunger pump housing (11), a liquid outlet channel (12) is provided in the plunger pump housing (11), the end of the liquid outlet channel (12) is connected to a spray gun of the plunger sprayer through a liquid outlet (13), characterized in that: The device also comprises an adjusting screw (1), a micro switch (2), a switch housing (3), a pressure protection valve stem (4) and a pressure protection screw sleeve (15); a pressure-maintaining channel (14) communicating with a liquid outlet channel (12) is provided in the plunger pump housing (11); the switch housing (3) is fixed to the plunger pump housing (11); the micro switch (2) is press-fitted into the switch housing (3); the pressure protection screw sleeve (15) is fixed to the plunger pump housing (11) and extends into the switch housing (3); one end of the pressure protection valve stem (4) extends into the pressure-maintaining channel (14); the other end of the pressure protection valve stem (4) penetrates the pressure-maintaining channel (14); The pressure protection screw sleeve (15) is located above the micro switch (2) and is used to abut against the switch button (19) of the micro switch (2). The micro switch (2) controls the operation of the plunger sprayer through electrical connection. A spring (5) is arranged between the pressure protection valve stem (4) and the pressure protection screw sleeve (15) so that the pressure protection valve stem (4) slides up and down along the inner wall of the pressure retaining channel (14). One end of the adjusting screw (1) is connected to the switch housing (3) and the other end abuts against the micro switch (2). The adjusting screw (1) is used to push the micro switch (2) and adjust the distance between the pressure protection valve stem (4) and the switch button (19).

2. The adjustable pressure structure of the plunger sprayer according to claim 1, characterized in that: The switch housing (3) is provided with an adjustment hole (18), and the adjustment screw (1) is threadedly connected to the adjustment hole (18).

3. The adjustable pressure structure of the plunger sprayer according to claim 1, characterized in that: The switch housing (3) is formed by buckling together an upper and a lower part, which are fixed by a locking screw (16).

4. The adjustable pressure structure of the plunger sprayer according to claim 1, characterized in that: The micro switch (2) and the switch housing (3) are provided with latch holes (17) at corresponding positions. After the micro switch (2) is placed in the switch housing (3), a latch (10) is sequentially passed through the switch housing (3) and the latch holes (17) on the micro switch (2) to position the micro switch (2) and the switch housing (3). When the adjusting screw (1) pushes the micro switch (2), the micro switch (2) rotates around the latch (10), thereby changing the distance between the pressure protection valve stem (4) and the switch button (19).

5. The adjustable pressure structure of the plunger sprayer according to claim 4, characterized in that: The distance between the pressure protection valve stem (4) and the switch button (19) can be adjusted in the range of 0 to 8 mm.

6. The adjustable pressure structure of the plunger sprayer according to claim 1, characterized in that: A guide sleeve (7) is arranged on the inner wall of the pressure-maintaining channel (14), a gasket (6) is arranged between the pressure protection screw sleeve (15) and the inner wall of the plunger pump housing (11), and after the pressure protection screw sleeve (15) and the plunger pump housing (11) are locked, the guide sleeve (7) is pressed by the gasket (6).

7. The adjustable pressure structure of the plunger sprayer according to claim 6, characterized in that: The outer wall of the pressure protection valve stem (4) is installed with a pressure protection O-ring (9) and a gasket (8) in sequence from top to bottom, which are used to cooperate with the guide sleeve (7) for sliding sealing.

8. The adjustable pressure structure of the plunger sprayer according to claim 1, characterized in that: A step is arranged on the outer wall of the pressure protection valve stem (4) for cooperating with the gasket (6) and the pressure protection screw sleeve (15) to limit the upward and downward sliding stroke of the pressure protection valve stem (4).

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