KR20220129967A - Diaphragm piston pump for painting - Google Patents

Abstract

The present invention relates to a diaphragm piston pump for painting and, more specifically, to a diaphragm piston pump for painting, which is a pump for indoor and outdoor interior painting, has little pulsation, and implements a discharge pressure of 120-200 bar. The diaphragm piston pump for painting comprises: an electric motor (20) for reciprocating the piston (60) of a pump assembly; and a cart (1). The pump assembly includes: an oil case (30) for supporting a cam (25) and a bearing (26) connected to the shaft of the electric motor (20), having cooling fins for cooling provided on the outer circumferential surface thereof, for storing hydraulic oil in an inner accommodating portion thereof, and having a hydraulic oil duct; a cylinder (1) fastened to the top of the oil case (30), for guiding the piston (60) reciprocating up and down by the eccentric rotation of the bearing (26), and having an oil pressure valve (35) and a hydraulic oil duct on one side thereof; a diaphragm (70) accommodated in the cylinder (1), connected to a spring (71) and a holder (74) for returning to the original state, and having a space into which a diaphragm sheet (72) and the hydraulic oil are introduced; and a base frame (50) having a suction hose (50) and a suction valve (51) for suctioning a paint by operation of the diaphragm (70), the outlet valve (55) of a check valve of a duct for discharging the paint, a drain valve (41) for checking the amount of the paint discharged, a pressure gauge, and a spray gun connection duct. Therefore, the diaphragm piston pump for painting can maintain a constant suction and discharge pressure of the paint.

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 is a pump for indoor and outdoor interior painting, has less pulsation, and has a discharge pressure of 120 to 200 bar.

A diaphragm pump is a device that pumps fluid by converting the rotational motion of the motor into a linear reciprocating motion of the diaphragm through a mechanism such as a cam. have.

In order to achieve a uniform spray painting surface, a pump for painting indoors and outdoors for buildings needs a pump for painting that has a discharge pressure of 120 to 180 bar, which has low pulsation pressure, low noise, and does not cause much scattering of paint.

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

In order to improve the quality of the spray painted surface, it is necessary to stably maintain a constant discharge pressure. However, in products manufactured or imported at home and abroad, the deviation of the discharge pressure is 20 to 40 bar or more, and the 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 construction painting with a simple discharge pressure control and structure is required.

1. KR 10-1824053 B1, 'A device for painting two-component characters or symbols and a painting method using the same', registration date: 2018.01.25. 2. KR 10-2018-0072862 A, 'diaphragm pump', published on: 2018.06.29. 3. KR 10-2020-0035810 A, 'Reciprocating pump', published on: 2020.04.06. 4. KR 10-2118337 B1, 'diaphragm pump', registration date: 2020.05.28. 5. JP S555470 A, 'DIAPHRAGM PUMP', published on: January 16, 1980.

The present invention was devised to solve the above problems, and by using a diaphragm pump, the discharge pressure deviation can be controlled within 10 bar in the discharge pressure range of 120 to 200 bar. It is an object of the present invention to

In order to achieve the object of the present invention, the present invention provides a pump assembly for operating the 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 A cylinder ( 1) and; a diaphragm 70 accommodated in the cylinder 1 and connected to a spring 71 and a holder 74 for returning to its original state to form a space through which the diaphragm seat 72 and hydraulic oil are introduced; The suction hose 50 and the suction valve 51 for sucking the paint by the operation of the diaphragm 70, the outlet valve 55 of the check valve of the conduit for discharging the paint, and the drain valve 41 for checking the discharge amount of the paint ), and a base frame (50) having a pressure gauge and a spray gun connection pipe; to disclose a diaphragm piston pump for painting, characterized in that it includes.

In addition, in order to control the discharge pressure deviation, the outlet valve 55 of the base frame 50 is configured to control the vacuum pressure within a certain range, and the ball 55-2 of the outlet valve 55 is made of a ceramic material. To disclose a diaphragm piston pump for painting characterized in that. .

In addition, for precise control of the discharge pressure, the oil pressure valve 35, as a relief valve, includes a ball 35-4; a hollow seat (35-5) on which the ball (35-4) is seated; a stem (35-3) for pressing with a spring (35-2) while in contact with the ball (35-4); A diaphragm piston pump for painting including a handle 35-1 for adjusting the tension of the spring 35-2, wherein the ball 35-4 is made of a carbide material.

In addition, for stable vacuum pressure and maximum discharge pressure limitation, 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 Disclosed is a diaphragm piston pump for painting.

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

First, according to the present invention, by configuring the ball made of a ceramic material in the outlet valve 55, the diaphragm pump can be smoothly driven, and the suction and discharge pressure of the paint can be kept 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 the carbide ball 35-4. Controllable.

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

1 is a perspective view of a diaphragm piston pump for painting, a preferred embodiment of the present invention.
2 is a perspective view of the pump assembly with the electric motor 20 and the 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 pipe line and the 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 of ordinary skill in the art to which the present invention pertains can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

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

In addition, since the size, color, and thickness of each component shown in the drawings are arbitrarily indicated for convenience of description, the present invention is not necessarily limited to the bars shown in the drawings. In order to clearly express various parts and regions in the drawings, the colors for each component are expressed as in the drawings, but it is evident that the patent rights range includes various colors.

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

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

The present invention is a technology devised with three goals.

First, a diaphragm pump is used to be suitable for architectural painting, the discharge pressure will operate in the range of 120 to 200 bar, second, the discharge pressure deviation will be able to be controlled stably within 10 bar, and third, by lowering vibration and noise, the pump It will work reliably.

Domestic competitor's products have too high vibration, so the painting pump is often not in place and moves by its own vibration.

In order to achieve the above goal, 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. This is because, when the stroke length is set high, the maximum discharge pressure increases, but vibration and noise increase, 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, the outlet valve and oil pressure valve were intensively improved to control the discharge pressure deviation within 10 bar to improve the quality of the painted surface.

For the ball material of the outlet valve, it is common to use carbide or SUS in consideration of corrosion and durability. No pressure was created to open the ball.

Therefore, in the present invention, a ball made of a ceramic material having an appropriate weight and durability is applied to the outlet valve.

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

Existing conical needle valves were replaced with relief valves because there was a gap between the seat and the needle due to repeated operation, and it was impossible to respond to changes in discharge pressure.

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

1 is a perspective view of a diaphragm piston pump for painting, a preferred embodiment of the present invention, FIG. 2 is a perspective view of the pump assembly with the electric motor 20 and the cart 10 removed, and FIG. 4 is the diaphragm piston pump It is a cross section.

1 to 4, the present invention includes a pump assembly for operating a diaphragm 70, an electric motor 20 for reciprocating a piston 60 of the pump assembly, and the electric motor 20 In the diaphragm piston pump for painting 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 a cooling fin for cooling, storing hydraulic oil in an internal accommodating part, and forming a hydraulic oil conduit; A cylinder ( 1) and; a diaphragm 70 accommodated in the cylinder 1 and connected to a spring 71 and a holder 74 for returning to its original state to form a space through which the diaphragm seat 72 and hydraulic oil are introduced; The suction hose 50 and the suction valve 51 for sucking the paint by the operation of the diaphragm 70, the outlet valve 55 of the check valve of the conduit for discharging the paint, and the drain valve 41 for checking the discharge amount of the paint ), and the base frame 50 having a pressure gauge and a spray gun connection pipe; characterized in that it includes.

The cart 10 has a structure in which a handle is folded, a vibration-proof member for absorbing vibrations of the electric motor 20, and an electric motor in a state in which the center of gravity is moved by 80% or more to the support in front of the wheel. It is preferable to be fastened.

The electric motor 20 preferably has an output of 0.9 ~ 1.5 kw, and includes a condensing or inverter type controller, an on-off operation switch 22 , and a power supply check lamp 21 . desirable.

The shaft of the electric motor 20 is fastened to a cam 25 , and the cam 25 is fastened to an inner receiving part of the bearing 26 . Accordingly, the cam has an eccentricity 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 introducing oil (working oil), a bar-shaped oil gauge 37 for measuring the flow rate of oil, and three rows of cooling fins on the outer peripheral surface for cooling. 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 , and stores hydraulic oil in an internal accommodating part, and forms a hydraulic oil pipe.

An oil inlet pipe 31 for sucking hydraulic oil in the inner receiving part of the oil case 30, and a wire mesh, a perforated plate, A porous plate or the like is provided with a filter strainer (32).

The cylinder 1 guides the linear motion of the piston 60, and it is preferable to have one or more conduits so that the hydraulic oil can be introduced into the upper end of the piston. In addition, an oil pressure valve 35 and a hydraulic oil pipe are formed on one side portion.

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

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

As shown in Figure 3, the piston (60) stroke length of the present invention is characterized by lowering to less than 7.5mm. Considering that other companies' products have a piston stroke length of about 9.7mm, they were developed low. This is to reduce the vibration and pulsation pressure caused by the short stroke stroke.

However, in order to secure the discharge flow rate, the inner diameter of the cylinder was increased 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 line and the oil pressure valve 35 .

As shown in FIGS. 4 to 5 , the hydraulic oil is supplied between the strainer 32 , the oil inlet pipe 31 , the cylinder 1 , the diaphragm 70 and the diaphragm seat 72 in the oil case 30 internal accommodating part. 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, and the vacuum pressure of the suction valve 51 is in the range of -0.02 to 0.04 MPa or the maximum discharge pressure is limited to the range of 120 to 200 bar. desirable.

If the vacuum pressure is less than the above range, high viscosity paint cannot be sucked. (35), the suction valve 51 and the outlet valve 55 may cause malfunctions.

The oil pressure valve 35, as a relief valve, includes a ball 35-4; a hollow seat (35-5) on which the ball (35-4) is seated; a stem (35-3) for pressing with a spring (35-2) while in contact with the ball (35-4); A handle 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.

Existing conical needle valves are replaced with relief valves because there is a gap between the seat and needle due to repeated operation, and it is impossible to respond to changes in discharge pressure. By rotating it, the durability of the seat and ball is increased, and when the discharge pressure is high, the hydraulic oil can be recovered 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 and the holder 74 for returning to its original state to form a space through which the diaphragm seat 72 and the hydraulic oil are introduced. In addition, the edge of the diaphragm 70 is fixed by a through bolt 5 that fastens the base frame 40 , the cylinder 1 and the oil case 30 .

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

The base frame 50 is a frame fastened to the upper end of the diaphragm 70, and preferably includes two check valves for sucking and discharging paint by the operation of the diaphragm 70, and the two check valves are each A suction valve (51) and an outlet valve (55).

The outlet valve 55, as a check valve, 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 for pressing with 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 that of the ceramic material. However, considering an environment that opens and closes quickly in a short time due to the characteristics of the diaphragm, high surface hardness is also required.

The base frame 50 is divided into two in relation to the discharge of the paint. One is a pipe connected to a spray gun, and the other is a drain valve 41 for checking the discharge amount of the paint.

The drain valve 41 is a needle valve, and includes an adjustment knob 41-1; a stem 41-2 and a needle 41-3 coupled 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 confirms that air is removed from the suction hose 51 and the pipeline of the pump assembly and that the paint is completely supplied. When the valve is opened, the paint is recovered into the paint container through the drain hose, When the is closed, the paint is supplied to the spray gun.

The drain valve 41 is preferably opened when the diaphragm piston pump for painting is initially operated, and is 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: knob,
41-2: stem, 41-3: needle, 42: drain nibble,
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 conduit, 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,
Oil that supports the cam 25 and the bearing 26 connected to the shaft of the electric motor 20, has cooling fins for cooling on the outer peripheral surface, stores hydraulic oil in the inner accommodating part, and forms a hydraulic oil pipeline a case 30;
A cylinder ( 1) and;
a diaphragm 70 accommodated in the cylinder 1 and connected to a spring 71 and a holder 74 for returning to its original state to form a space through which the diaphragm seat 72 and hydraulic oil are introduced;
The suction hose 50 and the suction valve 51 for sucking the paint by the operation of the diaphragm 70, the outlet valve 55 of the check valve of the conduit for discharging the paint, and the drain valve 41 for checking the discharge amount of the paint ), and a base frame (50) having a pressure gauge and a spray gun connection pipe; a diaphragm piston pump for painting, comprising: a.
The method of claim 1,
The outlet valve 55 of the base frame 50,
A check valve comprising: 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) for pressing with a spring,
The ball (55-2) is a diaphragm piston pump for painting, characterized in that composed of a ceramic material.
The method of claim 1,
The oil pressure valve 35 is
A relief valve comprising: a ball (35-4);
a hollow seat (35-5) on which the ball (35-4) is seated;
a stem (35-3) for pressing with a spring (35-2) while in contact with the ball (35-4);
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.
The stroke length of the piston 60 is lowered to within 7.5 mm,
The vacuum pressure of the suction valve 51 is a diaphragm piston pump for painting, characterized in that it operates within the range of -0.02 to 0.04 MPa.
The drain valve 41 is
A needle valve comprising: a knob for adjustment (41-1);
a stem 41-2 and a needle 41-3 coupled to the handle 41-1;
Diaphragm piston pump for painting, characterized in that it comprises a seat in contact with the needle.

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