KR102491699B1 - Diaphragm piston pump for painting - Google Patents

Abstract

The present invention relates to a diaphragm piston pump for painting, and more particularly, to a diaphragm piston pump for painting, which has little pulsation and realizes a discharge pressure of 120 to 200 bar, as a pump for indoor and outdoor interior painting.
The present invention includes an electric motor 20 for reciprocating the piston 60 of the pump assembly and a cart 1, wherein the pump assembly includes a cam 25 connected to a shaft of the electric motor 20 and a bearing an oil case (30) supporting (26), having cooling fins for cooling on an outer circumferential surface, storing hydraulic oil in an inner accommodating part, and forming a hydraulic oil pipe; It is fastened to the upper end of the oil case 30, guides the piston 60 reciprocating up and down by the eccentric rotation of the bearing 26, has an oil pressure valve 35 on one side, forms a hydraulic oil pipe, Cylinder (1) and; A diaphragm 70 accommodated inside the cylinder 1 and connected to the spring 71 and the holder 74 for returning to its original state, forming a space through which the diaphragm seat 72 and hydraulic fluid flow; The suction hose 50 and the suction valve 51 for sucking in the paint by the operation of the diaphragm 70, the outlet valve 55 of the check valve of the pipe through which the paint is discharged, and the drain valve 41 for checking the discharge amount of the paint ), and a base frame 40 having a pressure gauge and a spray gun connection line.

Description

Diaphragm piston pump for painting}

The present invention relates to a diaphragm piston pump for painting, and more particularly, to a diaphragm piston pump for painting, which has little pulsation and realizes a discharge pressure of 120 to 200 bar, as a pump for indoor and outdoor interior painting.

A diaphragm pump is a device that pumps fluid by converting the rotational motion of a motor into linear reciprocating motion of a diaphragm through a mechanism such as a cam. It is generally used for metered injection of liquid chemicals or drugs because the discharge flow rate is small. there is.

The pump for interior and exterior painting of buildings requires a pump for painting that implements a discharge pressure of 120 to 180 bar, which has low pulsation pressure, low noise, and does not cause much scattering of paint in order to achieve a constant spray paint surface.

A low-capacity diaphragm pump has been developed and used for construction rather than a piston pump that realizes more than 220 bar applied to shipbuilding or plants.

In order to improve the quality of the spray-painted surface, a technology to stably maintain a constant discharge pressure is required. However, domestically produced or imported products have a discharge pressure deviation of 20 to 40 bar or more, and malfunction of the check valve The pump stops frequently.

Therefore, while using a diaphragm pump for painting, a technology capable of stably controlling the discharge pressure deviation within 10 bar is required, and a diaphragm pump for building painting with a simple structure and control of discharge pressure is required.

1. KR 10-1824053 B1, 'Two-component character or symbol painting device and painting method using the same', registration date: 2018.01.25. 2. KR 10-2018-0072862 A, 'diaphragm pump', publication date: 2018.06.29. 3. KR 10-2020-0035810 A, 'Reciprocating pump', Publication date: 2020.04.06. 4. KR 10-2118337 B1, 'diaphragm pump', registration date: 2020.05.28. 5. JP S555470 A, 'DIAPHRAGM PUMP', Publication date: 1980.01.16.

The present invention has been devised to solve the above problems, and discloses a diaphragm piston pump for painting, which can control the discharge pressure deviation within 10 bar in the range of 120 to 200 bar of discharge pressure using a diaphragm pump, and is suitable for interior painting of buildings. It is the object of the present invention to do.

In order to achieve the above object, the present invention provides a pump assembly for operating a diaphragm 70, an electric motor 20 for reciprocating the piston 60 of the pump assembly, and supporting the electric motor 20 In the diaphragm piston pump for painting including a cart (1) for moving and moving, the pump assembly supports a cam (25) and a bearing (26) connected to a shaft of the electric motor (20), and is cooled on an outer circumferential surface. An oil case 30 having a cooling fin for, storing operating oil in an internal accommodating unit, and forming a hydraulic oil duct; It is fastened to the upper end of the oil case 30, guides the piston 60 reciprocating up and down by the eccentric rotation of the bearing 26, has an oil pressure valve 35 on one side, forms a hydraulic oil pipe, Cylinder (1) and; A diaphragm 70 accommodated inside the cylinder 1 and connected to the spring 71 and the holder 74 for returning to its original state, forming a space through which the diaphragm seat 72 and hydraulic fluid flow; The suction hose 50 and the suction valve 51 for sucking in the paint by the operation of the diaphragm 70, the outlet valve 55 of the check valve of the pipe through which the paint is discharged, and the drain valve 41 for checking the discharge amount of the paint ), and a base frame 40 having a pressure gauge and a spray gun connection pipe.

In addition, in order to control the discharge pressure deviation, the outlet valve 55 of the base frame 40, in order to control the vacuum pressure within a certain range, the ball 55-2 of the outlet valve 55 is made of a ceramic material. Disclosed is a diaphragm piston pump for painting. .

In addition, for precise control of the discharge pressure, the oil pressure valve 35 is a relief valve, and includes a ball 35-4; a hollow seat 35-5 on which the ball 35-4 is seated; a stem (35-3) that contacts the ball (35-4) and presses it with a spring (35-2); Disclosed is a diaphragm piston pump for painting, characterized in that it includes a knob (35-1) for adjusting the tension of the spring (35-2), and the ball (35-4) is made of a carbide material.

In addition, in order to limit the stable vacuum pressure and maximum discharge pressure, the stroke length of the piston 60 is lowered to within 7.5 mm, and the vacuum pressure of the suction valve 51 is operated within the range of -0.02 to 0.04 MPa. Characterized in that It is intended to disclose a diaphragm piston pump for painting.

Due to the above solutions, the present invention has the following effects.

First, in the present invention, by configuring the outlet valve 55 with a ceramic ball, the diaphragm pump can be smoothly driven, and the suction and discharge pressures of the paint can be maintained constant.

Second, in the present invention, by applying the oil pressure valve 35 as a relief valve, the discharge pressure deviation can be controlled within 10 bar, and durability and discharge pressure can be increased to 120 to 200 bar by using a ball 35-4 made of carbide material. can be controlled

Third, by lowering the piston stroke length to within 7.5mm, vibration and noise are lowered by more than 30% compared to other companies' products, and the vacuum pressure of the suction valve is within the range of -0.02 ~ 0.04MPa, and it is easy to control the stable vacuum pressure and discharge pressure.

1 is a perspective view of a diaphragm piston pump for painting, which is a preferred embodiment of the present invention.
2 is a perspective view of the pump assembly with the electric motor 20 and cart 10 removed.
3 is a schematic diagram of the stroke of the piston 60 and the rotational motion of the cam 26.
4 is a cross-sectional view of a diaphragm piston pump.
5 is a detailed view of the oil duct and oil pressure valve 35.
6 is a driving state diagram of the diaphragm 70.
7 is a detailed view of the drain valve 41 and the paint discharge pipe.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts irrelevant to the description (all matters such as electric circuits and other required parts) are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

In addition, since the size, color, and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to those shown in the drawings. In order to clearly express various parts and areas in the drawing, the color of each component is expressed as in the drawing, but it is obvious that the scope of the patent right includes all various colors.

The thickness or size of the components in the drawing is also shown enlarged for clarity of expression. In addition, for convenience of description in the drawings, the thicknesses of some parts and regions are exaggerated.

The present invention relates to a diaphragm piston pump for painting, and more particularly, to a diaphragm piston pump for painting, which has little pulsation and realizes a discharge pressure of 120 to 200 bar, as a pump for indoor and outdoor interior painting.

The present invention is a technique created with three goals.

First, a diaphragm pump is used to be suitable for building painting, and the discharge pressure will operate in the range of 120 to 200 bar. Second, the discharge pressure deviation will be stable within 10 bar. Third, by lowering vibration and noise, the pump can It will work reliably.

The vibration of other domestic products is too high, so there are many cases where the painting pump is not in place and moves with its own vibration.

In order to achieve the above object, the present invention grafted three technologies.

First, the stroke length of the piston 60 was lowered to within 7.5 mm, and the vacuum pressure of the suction valve 51 was operated within the range of -0.02 to 0.04 MPa. When the stroke length is set high, the maximum discharge pressure is high, but vibration and noise are high, so it is not suitable for indoor interior construction. Therefore, in the present invention, the stroke length of the piston 60 is lowered to within 7.5 mm so that the discharge pressure can be implemented in the range of 120 to 200 bar.

Second and third, in order to improve the quality of the painted surface, the outlet valve and the oil pressure valve were intensively improved to control the discharge pressure deviation within 10 bar.

It is common to use carbide or SUS as the ball material of the outlet valve in consideration of corrosion and durability. However, as the vacuum pressure of the present invention is set in the range of -0.02 to 0.04 MPa, the ball made of carbide or SUS is heavy, so it is difficult to paint. did not build up pressure to open the ball.

Therefore, in the present invention, a ceramic ball having appropriate weight and durability was applied to the outlet valve.

In addition, the precision of the oil pressure valve was required to control the discharge pressure deviation within 10 bar. A ball made of carbide was applied while replacing the existing needle valve with a relief valve.

The existing conical needle valve was replaced with a relief valve because play occurred between the seat and the needle due to repetitive operation and it was impossible to respond to the discharge pressure fluctuation.

This is because when the relief valve is applied, the durability of the seat and the ball is increased by rotating the ball while the hydraulic oil passes through the pipe line, and when the discharge pressure increases, the hydraulic oil is returned to the oil case to maintain a constant discharge pressure.

1 is a perspective view of a diaphragm piston pump for painting, which is a preferred embodiment of the present invention, FIG. 2 is a perspective view of a pump assembly in a state in which an electric motor 20 and a cart 10 are removed, and FIG. 4 is a diaphragm piston pump it is a cross section

1 to 4, the present invention includes a pump assembly for operating the diaphragm 70, an electric motor 20 for reciprocating the piston 60 of the pump assembly, and the electric motor 20 In the painting diaphragm piston pump including a cart (1) for supporting and moving, the pump assembly supports a cam (25) and a bearing (26) connected to a shaft of the electric motor (20), an oil case 30 having cooling fins for cooling, storing operating oil in an internal accommodating unit, and forming a hydraulic oil duct; It is fastened to the upper end of the oil case 30, guides the piston 60 reciprocating up and down with the eccentric rotation of the bearing 26, has an oil pressure valve 35 on one side, forms a hydraulic oil pipe, Cylinder (1) and; A diaphragm 70 accommodated inside the cylinder 1 and connected to the spring 71 and the holder 74 for returning to its original state, forming a space through which the diaphragm seat 72 and hydraulic fluid flow; The suction hose 50 and the suction valve 51 for sucking in the paint by the operation of the diaphragm 70, the outlet valve 55 of the check valve of the pipe through which the paint is discharged, and the drain valve 41 for checking the discharge amount of the paint ), and a base frame 40 having a pressure gauge and a spray gun connection line.

The cart 10 has a structure in which a handle is folded, an anti-vibration member for absorbing vibration of the electric motor 20, and an electric motor and It is desirable to conclude

The electric motor 20 preferably has an output of 0.9 ~ 1.5 kw, and it is preferable to have a condensing or inverter type controller, an on-off operation switch 22, and a power confirmation lamp 21. desirable.

The shaft of the electric motor 20 is fastened to the cam 25, and the cam 25 is fastened to the inner receiving portion of the bearing 26. As a result, the cam has an eccentric amount according to the rotation of the electric motor, and the piston 60 in contact with the bearing 26 performs a linear reciprocating motion.

The oil case 30 is provided with an inlet 39 for injecting oil (hydraulic oil), a rod-shaped oil gauge 37 for measuring the flow rate of oil, and three rows of cooling fins for cooling on the outer circumferential surface. are doing

The oil case 30 has a structure capable of supporting the cam 25 and the bearing 26 connected to the shaft of the electric motor 20, stores hydraulic oil in an internal receiving part, and forms a hydraulic oil pipe.

An oil inlet pipe 31 for sucking hydraulic oil is placed in the inner receiving part of the oil case 30, and a simple filter for removing the solid mixture of the hydraulic oil is provided at the end of the oil inlet pipe 21, such as a wire mesh, a perforated plate, A porous plate or the like is provided as the strainer 32 of the filter.

The cylinder 1 guides the linear motion of the piston 60, and preferably has one or more conduits so that working oil can be introduced into the upper end of the piston. In addition, an oil pressure valve 35 is provided on one side, and a hydraulic oil pipe is formed.

3 is a schematic diagram of the stroke of the piston 60 and the rotational motion of the cam 26.

Figure 3A is a perspective view showing the fastening relationship between the bearing and the piston in a state where the oil case is made transparent, Figure 3B is a case where the bearing is bottom dead center, Figure 3C is a front view in case the bearing is top dead center.

As shown in Figure 3, the stroke length of the piston 60 of the present invention is characterized by lowering to within 7.5 mm. Other companies' products were developed low considering the case of 9.7mm piston stroke length. This is to reduce the vibration and pulsation pressure according to the short stroke stroke.

However, in order to secure the discharge flow rate, the inner diameter of the cylinder was enlarged from 18mm to 20mm.

4 is a cross-sectional view of the diaphragm piston pump, and FIG. 5 is a detailed view of the oil pipe and oil pressure valve 35.

As shown in FIGS. 4 and 5, the hydraulic oil is transferred between the strainer 32, the oil inlet pipe 31, the cylinder 1, the diaphragm 70 and the diaphragm sheet 72 in the oil case 30 inside the receiving portion. It circulates through the space, the oil pressure valve 35 and the oil discharge pipe 36 to the oil case.

The discharge pressure of the diaphragm piston pump for painting is controlled by the degree of opening and closing of the oil pressure valve 35. desirable.

If the vacuum pressure is less than the above range, paint with high viscosity cannot be sucked in. If the vacuum pressure exceeds the above range, the maximum discharge pressure can be increased up to 230 bar, but the diaphragm is damaged, durability is rapidly reduced, and the oil pressure valve (35), suction valve 51 and outlet valve 55 may malfunction.

The oil pressure valve 35 is a relief valve, and includes a ball 35-4; a hollow seat 35-5 on which the ball 35-4 is seated; a stem (35-3) that contacts the ball (35-4) and presses it with a spring (35-2); A knob 35-1 for adjusting the tension of the spring 35-2 is included, and the ball 35-4 is made of a carbide material.

The oil pressure valve 35 requires precision of the oil pressure valve in order to control the discharge pressure deviation of the paint within 10 bar, so in the present invention, a ball made of carbide was applied while replacing the existing needle valve with a relief valve.

The existing conical needle valve has a gap between the seat and the needle due to repetitive operation, and it is impossible to respond to discharge pressure fluctuations, so it was replaced with a relief valve. It rotates to increase the durability of the seat and ball, and when the discharge pressure increases, the hydraulic oil is returned to the oil case to maintain the set discharge pressure stably.

4 is a cross-sectional view of the diaphragm piston pump, FIG. 6 is a driving state diagram of the diaphragm 70, and FIG. 7 is a detailed view of the drain valve 41 and the paint discharge pipe.

The diaphragm 70 is connected to the spring 71 for returning to its original state and the holder 74 to form a space into which the diaphragm seat 72 and hydraulic fluid flow. In addition, the edge of the diaphragm 70 is fixed by through bolts 5 fastening the base frame 40, the cylinder 1 and the oil case 30 together.

The hydraulic oil pipe 73 of the diaphragm seat 72 is connected to the cylinder 1 as a pipe through which hydraulic oil flows.

The base frame 40 is a frame fastened to the upper end of the diaphragm 70, and preferably has two check valves for sucking and discharging paint by the operation of the diaphragm 70, and the two check valves are respectively They are the suction valve 51 and the outlet valve 55.

The outlet valve 55 is a check valve, and includes a spherical ball 55-2; a hollow seat 55-1 on which the ball 55-2 is seated; It includes the ball 55-2 and a plug 55-3 pressurized by a spring, wherein the ball 55-2 is made of a ceramic material.

The material of the ball of the outlet valve may be replaced with a ceramic material or a material having a weight equivalent to the ceramic material. However, considering the environment in which the diaphragm is rapidly opened and closed in a short time due to the characteristics of the diaphragm, high surface hardness is also required.

In relation to the discharge of paint from the base frame 40, it is divided into two, one is a conduit connected to the spray gun, and the other is divided into a drain valve 41 for checking whether or not the amount of paint is discharged.

The drain valve 41 is a needle valve, and includes an adjustment knob 41-1; a stem 41-2 and a needle 41-3 fastened to the handle 41-1; It is characterized in that it comprises a sheet in contact with the needle.

The drain valve 41 is a valve that checks whether air is removed from the pipe line of the suction hose 51 and the pump assembly and whether the paint is completely supplied. When the valve is opened, the paint is returned to the paint container through the drain hose, and the valve When the is closed, the paint is supplied by the spray gun.

The drain valve 41 is preferably open when the diaphragm piston pump for painting is initially operated, and is also preferably opened during no-load operation of the electric motor and cleaning of the pump assembly.

1: cylinder,
5: through bolt, 10: cart,
20: electric motor, 21: lamp, 22: operation switch,
24: motor controller, 25: cam, 26: bearing,
30: oil case, 31: oil inlet pipe, 32: strainer,
35: oil pressure valve, 35-1: knob, 35-2: spring,
35-3: stem, 35-4: ball, 35-5: seat,
36: oil discharge pipe, 37: oil gauge, 39: oil inlet,
40: base frame, 41: drain valve, 41-1: handle,
41-2: stem, 41-3: needle, 42: drain nipple,
43: drain hose,
50: suction hose, 51: suction valve, 54: discharge pipe,
55: outlet valve, 55-1: holder, 55-2: ball,
55-3: plug,
60: piston, 61: spring,
70: diaphragm, 71: spring, 72: diaphragm seat,
73: hydraulic oil pipe, 74: holder.

Claims (5)

A pump assembly for operating the diaphragm 70, an electric motor 20 for reciprocating the piston 60 of the pump assembly, and a cart 1 for supporting and moving the electric motor 20, In the diaphragm piston pump for painting,
The pump assembly,
It supports the cam 25 and the bearing 26 connected to the shaft of the electric motor 20, has a cooling fin for cooling on the outer circumferential surface, stores hydraulic oil in the inner receiving part, and forms a hydraulic oil pipe. with the case 30;
It is fastened to the upper end of the oil case 30, guides the piston 60 reciprocating up and down by the eccentric rotation of the bearing 26, has an oil pressure valve 35 on one side, forms a hydraulic oil pipe, Cylinder (1) and;
A diaphragm 70 accommodated inside the cylinder 1 and connected to the spring 71 and the holder 74 for returning to its original state, forming a space through which the diaphragm seat 72 and hydraulic fluid flow;
The suction hose 50 and the suction valve 51 for sucking in the paint by the operation of the diaphragm 70, the outlet valve 55 of the check valve of the pipe through which the paint is discharged, and the drain valve 41 for checking the discharge amount of the paint ) and a base frame 40 having a pressure gauge and a spray gun connection line;
The diaphragm piston pump for painting, characterized in that the stroke length of the piston (60) is within 7.5 mm.
According to claim 1,
The outlet valve 55 of the base frame 40,
As a check valve, a spherical ball (55-2);
a hollow seat 55-1 on which the ball 55-2 is seated;
Including the ball 55-2 and the plug 55-3 pressurized by the spring,
The ball (55-2) is a diaphragm piston pump for painting, characterized in that composed of a ceramic material.
According to claim 1,
The oil pressure valve 35,
As a relief valve, a ball 35-4;
a hollow seat 35-5 on which the ball 35-4 is seated;
a stem (35-3) that contacts the ball (35-4) and presses it with a spring (35-2);
Including a handle 35-1 for adjusting the tension of the spring 35-2,
The ball (35-4) is a diaphragm piston pump for painting, characterized in that composed of a carbide material.
According to claim 1,
The suction valve 51 of the base frame 40,
A diaphragm piston pump for painting, characterized in that the vacuum pressure operates within the range of -0.02 to 0.04 MPa.
According to claim 1,
The drain valve 41 of the base frame 40,
As a needle valve, the handle 41-1;
a stem 41-2 and a needle 41-3 fastened to the handle 41-1;
A diaphragm piston pump for painting, comprising a; seat in contact with the needle.

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