KR100739504B1 - Portable automatic pump - Google Patents

Abstract

A portable automatic pump is provided to reduce a number of components, production costs, and the total size for conveniently carrying without an additional relief valve. A portable automatic pump includes an operation motor, an oil tank, a pump body(30), a piston, a first intake check valve, a second intake check valve, exhaust check valves, a solenoid valve, and a controller. The pump body includes an intake hole connected to the oil tank at one side and an exhaust hole extracting a hydraulic fluid sucked at the intake hole at the other side. A low pressure pumping space(33) and a high pressure pumping space(34) are installed between the intake hole and the exhaust hole.

Description

Portable automatic pump

1 is a circuit diagram of a conventional portable automatic pump

Figure 2 is a schematic perspective view of the present invention portable automatic pump

3A-3C are schematic partial front cross-sectional views, partial side cross-sectional views, and top view of FIG. 2;

4A to 4C are bottom, rear and bottom views of internal components of the present invention portable pump.

5 is a cross-sectional view showing the main part of the present invention.

6a and 6b are front and rear perspective views of the pump body

7A to 7C are cross-sectional views of the pump body, a side view of FIG. 7A, and a cross-sectional view along the line AA ′ of FIG. 7A.

8A and 8B are schematic cross-sectional views showing components installed in a pump body, and a cross-sectional view taken along line B-B 'of FIG. 8A.

* Description of the symbols for the main parts of the drawings *

10: drive motor 11: power line

12: base 20: oil tank

21: fastening ring 22: hook

30: pump body 31: inlet

32: outlet 33: low pressure pumping space

34: high pressure pumping space 35: suction flow path

36: first suction passage 37: first horizontal suction passage

38: first vertical suction path 39: second suction path

40: second horizontal suction path 41: second vertical suction path

43: first discharge path 44: first vertical discharge path

45: first horizontal discharge path 46: second discharge path

47: second vertical discharge euro 48: second horizontal discharge euro

50: first bolt hole 51: second bolt hole

52: third bolt hole 53: first pressure adjusting bolt hole

54: second pressure adjusting bolt hole 55: relief valve hole

56: third pressure adjusting bolt hole 57: low pressure oil discharge flow path

58: recovery flow path 59: flange

59a: flange hole 59b: coupling protrusion

60: piston 61: high pressure piston

62: head 63: low pressure piston

70: piston reciprocating transfer means 71: housing

72: pump body hole 73: drive shaft

74: eccentric cam 75: operating bearing

76 gear 77 return spring

80: first suction check valve 81,91,101,111,121,176: ball

82,92: Ball push 83,93,102,112,122,146,178: Spring

84,94: Multibase 85,95,142: Through Hole

90: second intake check valve 100: first discharge check valve

103: first pressure adjusting bolt 110: second discharge check valve

113: second pressure adjusting bolt 120: third discharge check valve

123: third pressure adjusting bolt 140: relief valve

141: relief body 143: nut

144: Lilly Fred 145: Sharp

150: solenoid valve 160: controller

173: hydraulic hose 174: first bolt

175: second bolt 177: third bolt

The present invention relates to a portable automatic pump, and more particularly, to a portable automatic pump that can pump low pressure and high pressure hydraulic pressure in a simple structure and is portable.

As is well known, the hydraulic pump is a device for converting mechanical energy supplied from the outside into pressure energy of the working oil of the hydraulic system. Such a hydraulic pump has a gear type for pressurizing by using a gap between a pair of rotating gears, a vane type for compressing hydraulic fluid using a vane connected coaxially with a rotating shaft, and a plurality of cylinders installed vertically or in parallel. There is a rotary piston type in which the volume is made smaller according to the rotational direction of the rotating shaft, and a reciprocating piston type in which the hydraulic oil in the cylinder is pressurized by a piston by converting the rotary motion into a linear reciprocating motion.

Among hydraulic pumps, reciprocating piston type automatic pumps are mainly connected to small hydraulic tools such as legend tools, hydraulic rams that open or pull narrow gaps, hydraulic spreaders that cut or deploy obstacles in water or on the ground. Likewise, the above-mentioned automatic pump should be connected to a small hydraulic tool which is carried by the worker.

Such a reciprocating piston type automatic pump usually includes an oil tank; A pump body in which an inlet connected to the oil tank and an outlet through which the inflow hydraulic oil is discharged and a pumping space for pumping the hydraulic oil from the inlet to the outlet are formed, and a flow path connecting the inlet, the outlet, and the pumping space; A piston installed in the pumping space of the pump body and reciprocating along the pumping space; It is composed of a drive motor connected to the piston to reciprocate the piston.

1 is a circuit diagram showing a problem of such a portable automatic pump, which is provided with a low pressure pump 3, a low pressure check valve 4, a low pressure relief valve 5 in one flow path of the pump body, and the other of the pump body. The high pressure pump 6, the high pressure check valve 7 and the high pressure relief valve 8 are provided in the flow path.

Therefore, when hydraulic oil is pumped in a state in which the automatic pump is not loaded, the hydraulic oil in the oil tank 2 is discharged to the outlet side through the low pressure pump 3 and the low pressure check valve 4, and when the hydraulic oil pumped is excessive, The amount is returned to the oil tank 2 through the low pressure relief valve 5.

When the hydraulic oil is pumped while the automatic pump is loaded, the hydraulic oil in the oil tank 2 is discharged to the outlet side through the high pressure pump 6 and the high pressure check valve 7, and when the hydraulic oil pumped is excessive, the high pressure relief valve is exceeded. (8) is returned to the oil tank (2) again.

In such a conventional portable automatic pump, when the control box (not shown) is operated, the driving motor 1 controlled by this is operated so that the hydraulic oil in the oil tank 2 is pumped to the inlet side of the pump body (not shown). The hydraulic oil passing through the flow path of the body passes through the solenoid valve 9 and is supplied to the hydraulic tool side by the hydraulic hose.

As described above, the conventional portable automatic pump is provided with a low pressure pump 3 and a high pressure pump 6 to suck hydraulic oil in the oil tank 2, and a low pressure relief valve 5 to recover the hydraulic oil that is excessively pumped. High pressure relief valves 8 are provided respectively.

Therefore, in the conventional portable automatic pump, two pumps 3 and 6 and two relief valves 5 and 8 are installed, thereby increasing the number of parts, and thus increasing the overall size and weight. As the number of parts increased, manufacturing cost rose and manufacturing process increased.

An object of the present invention for solving the above-mentioned problems is to provide a portable automatic pump for low pressure pumping and high pressure pumping after the oil in the oil tank is sucked into one inlet.

Another object of the present invention is to provide a portable automatic pump for reducing the number of parts.

Still another object of the present invention is to provide a portable automatic pump which is reduced in overall size and which is easy to carry.

The portable automatic pump of the present invention for achieving the above object, the drive motor is installed on the base; An oil tank installed under the base and storing hydraulic oil; There is provided an inlet connected to the oil tank and an outlet through which the hydraulic oil introduced from the inlet is discharged, and a low pressure pumping space formed between the inlet and the outlet, and a high pressure pumping space formed between the low pressure pumping space and the outlet. A pump body having a flow path connected to the inlet, the low pressure pumping space, the high pressure pumping space, and the outlet so that the hydraulic oil therein flows into the inlet and then passes through the low pressure pumping space and the high pressure pumping space; A piston installed to reciprocate in the low pressure pumping space and the high pressure pumping space of the pump body to suck hydraulic oil in the oil tank from the inlet to the low pressure pumping space and the high pressure pumping space, and to pump the sucked hydraulic oil to the outlet side; A piston reciprocating transfer means installed in the oil tank and connected to the drive motor and the piston to reciprocate the piston when the drive motor is driven; A first suction check valve installed in the flow path between the inlet of the pump body and the high pressure pumping space to allow the hydraulic oil in the oil tank to only flow into the high pressure pumping space and to prevent it from being discharged in reverse; A second suction check valve installed in the flow path between the inlet of the pump body and the low pressure pumping space to allow the hydraulic oil in the oil tank to only flow into the low pressure pumping space and to prevent the pump from being discharged in reverse; A first discharge check valve installed in the flow path between the high pressure pumping space and the outlet to allow the hydraulic oil in the high pressure pumping space to be discharged to the discharge port and to prevent the discharge of the hydraulic oil in the reverse direction; A second discharge check valve installed in the flow path between the low pressure pumping space and the outlet to allow the hydraulic oil in the low pressure pumping space to be discharged to the outlet and to prevent the discharge from the reverse; A third discharge check valve installed in a flow path of the pump body connecting the low pressure pumping space and the inside of the oil tank to recover the hydraulic oil in the low pressure pumping space to the oil tank when the high pressure pumping is performed; One end is connected to the flow path of the pump body and the other end is located in the oil tank, the relief is opened so that some hydraulic oil in the pumping space is recovered into the oil tank while opening when the discharge pressure of the set pressure is applied to the discharged hydraulic oil valve; A solenoid valve installed at an outlet side of the pump body to control a flow of hydraulic oil being pumped; The controller is connected to the drive motor and the solenoid valve to control them.

Another feature of the portable automatic pump of the present invention, the flow path of the pump body is connected to the inlet and the low pressure pumping space, high pressure pumping space and suction the hydraulic oil introduced into the inlet to the low pressure pumping space and high pressure pumping space side A first suction passage connected to the flow path, the suction flow path and the high pressure pumping space, and having a first suction check valve installed therein to guide the hydraulic oil introduced into the suction flow path to the high pressure pumping space, the suction flow path and the low pressure pumping space. A second suction flow passage connected to the second suction suction valve to guide the hydraulic oil introduced to the suction flow path toward the low pressure pumping space, the high pressure pumping space and the outlet, and a first discharge check valve installed; A first discharge passage for guiding the hydraulic oil introduced into the pumping space to be pumped to the discharge side, and the low pressure pumping space And a second discharge passage connected to the first discharge passage and having a second discharge check valve installed to guide the hydraulic oil introduced into the low pressure pumping space to be pumped toward the first discharge passage, and the second suction passage and the oil tank. And a third discharge check valve installed therein and a low pressure oil discharge passage guiding hydraulic oil inside the low pressure pumping space to be discharged to the oil tank during high pressure pumping, and connected to the high pressure pumping space and the inside of the oil tank, and the relief The valve is installed and consists of a recovery passage for guiding a portion of the hydraulic oil in the high pressure pumping space to be recovered to the oil tank during high pressure pumping.

Another feature of the portable automatic pump of the present invention is that the piston pumps hydraulic oil in the high pressure pumping space while one side is located in the low pressure pumping space and the other side is inserted into the high pressure pumping space and reciprocated along their center. It consists of a high pressure piston and a low pressure piston supported at one end of the high pressure piston and inserted into the low pressure pumping space and pumping hydraulic oil in the low pressure pumping space while being reciprocated with the high pressure piston.

Still another feature of the portable automatic pump of the present invention is that the piston reciprocating transfer means includes a drive shaft connected to the drive motor and thereby rotated, an eccentric cam coupled to the circumference of the drive shaft, and one end inside the low pressure pumping space. The return spring is supported and the other end is supported by the low pressure piston so that one end of the high pressure piston is elastically supported toward the eccentric cam side.

Another feature of the portable automatic pump of the present invention is that around the eccentric cam, an actuating bearing is further coupled to reduce the frictional resistance between the eccentric cam and the low pressure piston.

Therefore, a pump body in which a flow path is formed to enable low pressure pumping and high pressure pumping, a piston installed in the pump body to pump hydraulic oil in the low pressure pumping space and the high pressure pumping space, and the hydraulic oil in the low pressure pumping space during the high pressure pumping are oil tanks. The pump is composed of a third discharge check valve to be recovered to the side, and a relief valve to open some of the hydraulic oil in the high pressure pumping space to be recovered into the oil tank when the discharge pressure of the set pressure is applied to the hydraulic oil discharged to the outlet side. Compared with the conventional two-relief valve was installed, the number of parts is reduced, thereby reducing the manufacturing cost, and the overall size is reduced, the portability is easy to carry.

Specific features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

Figure 2 is a schematic perspective view showing a portable automatic pump of the present invention, Figures 3a to 3c is a schematic partial front cross-sectional view, a partial side cross-sectional view, a plan view of FIG. 4A to 4C are bottom, rear and bottom views of the internal parts of the portable automatic pump of the present invention, and FIG. 5 is a cross-sectional view showing the main part of the present invention, which includes a drive motor 10 and an oil tank 20. , Pump body 30, piston 60, the first suction check valve 80, the second suction check valve 90, the first discharge check valve to the third discharge check valve 120, solenoid valve 150 , The controller 160.

The power motor 11 is connected to the driving motor 10, and the controller 160, which will be described later, is connected and installed on the base 12. The driving motor 10 may use an external power source by plugging the plug of the power cord 11 extended to an adjacent external outlet (not shown), but by inserting a charger inside the automatic pump, It can also be used by charging.

The oil tank 20 is installed in the lower part of the base 12 as shown in FIG. 2, FIG. 3, and FIG. 5, and hydraulic oil is stored in it. A fastening ring 21 is formed on both outer sides of the oil tank 20, and the fastening ring 21 is connected to a hook string 22 so as to carry an automatic pump on a shoulder.

3 to 8, the pump body 30 is formed with an inlet 31 connected to the oil tank 20 on one side of the inner side and an outlet for discharging hydraulic oil introduced from the inlet 31 on the other side of the inside ( 32) is formed. A low pressure pumping space 33 and a high pressure pumping space 34 are provided between the inlet 31 and the outlet 32. The low pressure pumping space 33 and the high pressure pumping space 34 are directly connected to each other, the low pressure pumping space 33 is connected to the inlet 31 by the flow path of the pump body, the high pressure pumping space 34 is It is connected to the discharge port 32 by the flow path of the pump body. In such a pump body 30, the hydraulic oil in the oil tank 20 is introduced into the inlet 31 and then passed through the low pressure pumping space 33 and the high pressure pumping space 34 to the outlet 32 side, the inlet 31, A flow path is formed to connect the low pressure pumping space 33, the high pressure pumping space 34, and the outlet 32.

The flow path of the pump body 30 is a suction flow path 35 connected to one side of the low pressure pumping space 33 and the high pressure pumping space 34, as shown in detail in FIGS. 6a and 6b, 7a to 7c. The first discharge passage 43, the second discharge passage 46, and the low pressure connected to the other side of the first suction passage 36, the second suction passage 39, the low pressure pumping space 33, and the high pressure pumping space 34. An oil discharge passage 57 and a recovery passage 58 are formed.

The suction passage 35 is connected to the inlet 31, the low pressure pumping space 33, the high pressure pumping space 34, and receives the hydraulic oil introduced into the inlet 31 to the low pressure pumping space 33 and the high pressure pumping space 34. To the side.

The first suction passage 36 is connected to the suction passage 35 and the high pressure pumping space 34, and the first suction check valve 80 is installed, and the hydraulic oil introduced into the suction passage 35 has a high pressure pumping space 34. ) To the side. The first suction passage 36 is connected to the suction passage 35 and has a first horizontal suction passage 37 installed with a first suction check valve 80 to be described later, a high pressure pumping space 34 and a first one. The first vertical suction passage 38 is connected to the horizontal suction passage 37.

The second suction passage 39 is connected to the suction passage 35 and the low pressure pumping space 33, and the second suction check valve 90 is installed, and the hydraulic oil introduced into the suction passage 35 is supplied to the low pressure pumping space 33. ) To the side. The first suction passage 36 is connected to the suction passage 35 and has a second horizontal suction passage 40 installed with a second suction check valve 90 to be described later, the low pressure pumping space 33 and the second. The second vertical suction passage 41 is connected to the horizontal suction passage 40.

The first discharge passage 43 is connected to the high pressure pumping space 34 and the outlet 32, the first discharge check valve 100 is installed, and the hydraulic oil introduced into the high pressure pumping space 34 toward the outlet 32. Guide to pump. The first discharge passage 43 is connected to the high-pressure pumping space 34 and provided with a first vertical discharge passage 44 and a first vertical discharge passage 44 to which a first discharge check valve 100 to be described below is installed. It consists of a first horizontal discharge passage 45 connected to the discharge port (32).

The second discharge passage 46 is connected to the low pressure pumping space 33 and the first discharge passage 43, and the second discharge check valve 110 is installed, and the hydraulic oil introduced to the low pressure pumping space 33 is supplied to the first discharge passage 46. It guides to be pumped to the discharge flow path 43 side. The second discharge passage 46 is connected to the low pressure pumping space 33 and the second vertical discharge passage 47 and the second vertical discharge passage 47 are provided with a second discharge check valve 110 to be described later. It consists of a second horizontal discharge flow path (48) connected to the first vertical discharge flow path (44).

The low pressure oil discharge passage 57 is connected to the second horizontal suction passage 40 and the oil tank 20 of the second suction passage 39, and a third discharge check valve 120 to be described later is installed and pumped at a high pressure. During the low pressure pumping space 33 guides the hydraulic oil discharged to the oil tank (20).

The recovery flow path 58 is connected to the inside of the high pressure pumping space 34 and the oil tank 20, and a relief valve 140 is installed. When the high pressure pumping is carried out, a part of the hydraulic oil inside the high pressure pumping space 34 is an oil tank ( 20) to be recovered.

On the outer side of the pump body 30 having such a flow path, a flange 59 having a flange hole 59a is formed to fix the pump body 30 to the housing 71 to be described later. In the central portion of the engaging projection 59b is projected to be inserted into the pump body hole 72 of the housing 71 to be described later.

In addition, the first bolt hole 50 and the second bolt hole 51 are formed at the suction flow path 35 side of the pump body 30, and the first bolt 174 and the second bolt 175 are fastened. Therefore, when installing the first suction check valve 80 and the second suction check valve 90 to be described later or the opening and closing pressure in the first horizontal suction passage 37 and the second horizontal suction passage 40, the first bolt This is performed after separating the first bolt 174 and the second bolt 175 from the hole 50 and the second bolt hole 51.

The third bolt hole 52 is formed in the pump body 30 so as to be connected to the second horizontal discharge passage 48, and the third bolt hole 52 opens and closes the second horizontal discharge passage 48. The ball 176 and the spring 178 for supporting the ball 176 and the third bolt 177 for adjusting the pressure of the spring 178 are fastened.

The pump body 30 further includes a first pressure adjusting bolt hole 53, a second pressure adjusting bolt hole 54, a third pressure adjusting bolt hole 56, and a relief valve hole 55.

The first pressure adjusting bolt hole 53 is connected to the first vertical discharge passage 44 and the first pressure adjusting bolt 103 is adapted to adjust the pressure of the spring 102 of the first discharge check valve 100 to be described later. Is fastened.

The second pressure adjusting bolt hole 54 is connected to the second vertical discharge passage 47 and the second pressure adjusting bolt 113 adjusts the pressure of the spring 112 of the second discharge check valve 110 to be described later. Is fastened.

The third pressure adjusting bolt hole 56 is connected to the low pressure oil discharge passage 57 and the third pressure adjusting bolt 123 is fastened to adjust the pressure of the spring 122 of the third discharge check valve 120 to be described later. do.

The relief valve hole 55 is connected to the recovery flow path 58 and the relief valve 140 to be described later is fastened.

The housing 71 is fixed to the bottom of the base 12, as shown in Figures 3 to 5, the pump body hole 72 is formed so that the coupling protrusion (59b) of the pump body 30 is inserted in the lower one side It is. A gear 76 is built in the upper portion of the pump body 30, and the gear 76 is engaged with another gear (not shown) installed on a motor shaft (not shown) of the drive motor 10.

A drive shaft 73 to be described later is built in the center of the housing 71, and an upper end of the drive shaft 73 is coupled to the gear 76. Therefore, the power of the drive motor 10 is transmitted to the drive shaft 73 inside the housing 71 through the gear 76.

The piston 60 is installed in the oil tank 20 by being reciprocated in the low pressure pumping space 33 and the high pressure pumping space 34 of the pump body 30 as shown in FIGS. 3, 5, and 8. Hydraulic oil is sucked into the low pressure pumping space 33 and the high pressure pumping space 34 from the inlet 31, and the sucked hydraulic oil is pumped to the outlet 32.

The piston 60 is composed of a high pressure piston 61 and a low pressure piston 63.

The high pressure piston 61 has a portion of the piston head 62 on one side thereof is located in the low pressure pumping space 33 and enters the inside thereof, and the other side is inserted into the high pressure pumping space 34, and the low pressure pumping space 33 and Hydraulic oil in the high pressure pumping space 34 is pumped back and forth along the center of the high pressure pumping space 34.

The low pressure piston 63 has a C-shaped cross section. The low pressure piston 63 is supported at one end of the high pressure piston 61, inserted into the low pressure pumping space 33, and pumped hydraulic oil in the low pressure pumping space 33 while being reciprocated with the high pressure piston 61. .

The piston reciprocating transfer means 70 is installed in the oil tank 20 and is connected to the drive motor 10 and the piston 60 as shown in FIGS. 3 and 5 so that the piston when driving the drive motor 10 ( 60). The piston reciprocating transfer means 70, the drive shaft 73 is connected to the drive motor 10 is rotated thereby, the eccentric cam 74 is coupled to the circumference of the drive shaft 73, and one end of the low pressure pumping space ( 33) It is made of a return spring (77) which is supported inside and the other end is supported by the low pressure piston (63) so that one end of the high pressure piston (61) is elastically supported toward the eccentric cam (74).

Here, the circumference of the eccentric cam 74, the operating bearing 75 is coupled to reduce the frictional resistance between the eccentric cam 74 and the low pressure piston (63).

As shown in FIGS. 5 and 8, the first suction check valve 80 is installed in a flow path between the inlet 31 of the pump body 30 and the high pressure pumping space 34 to provide hydraulic oil in the oil tank 20. Is to be introduced only to the high-pressure pumping space 34 side to block the discharge to the reverse. The first suction check valve 80 is connected to the first horizontal suction passage 37 and is provided in the multibase 84 having a through hole 85 at the center thereof, and is provided inside the multibase 84. A ball 81 for opening and closing the hole 85, a ball push 82 provided inside the multi base 84 to push the ball 81 toward the through hole 85, and a multi base 84 installed therein. It consists of a spring 83 for elastically supporting the ball push 82 to the ball 81 side.

As shown in FIGS. 5 and 8, the second suction check valve 90 is installed in a flow path between the inlet 31 of the pump body 30 and the low pressure pumping space 33 to provide hydraulic oil in the oil tank 20. Only the low pressure pumping space 33 is allowed to flow in and prevents the discharge from the reverse. The second suction check valve 90 is connected to the second horizontal suction passage 40 and is provided in the multibase 94 having a through hole 95 at the center thereof, and is provided inside the multibase 94. A ball 91 for opening and closing the hole 95, a ball push 92 provided inside the multi base 94 to push the ball 91 toward the through hole 95 side, and a multi base 94 installed therein. It consists of a spring 93 for elastically supporting the ball push 92 to the ball 91 side.

As shown in FIGS. 5 and 8, the first discharge check valve 100 is installed in a flow path between the high pressure pumping space 34 and the discharge port 32 so that the hydraulic oil discharge port 32 in the high pressure pumping space 34 is discharged. To be discharged to the side and vice versa. The first discharge check valve 100 is provided in the first vertical discharge passage 44 to open and close the ball 101 and the first pressure regulating bolt 103 fastened to the first pressure adjusting bolt hole 53. And a spring 102 provided between the ball 101 and the first pressure adjusting bolt 103 to elastically support the ball 101 toward the first vertical discharge passage 44.

As shown in FIGS. 5 and 8, the second discharge check valve 110 is installed in a flow path between the low pressure pumping space 33 and the discharge port 32 so that the hydraulic oil discharge port 32 in the low pressure pumping space 33 is discharged. To be discharged to the side and vice versa. The second discharge check valve 110 is provided in the second vertical discharge passage 47 to open and close the ball 111 and the second pressure regulating bolt 113 fastened to the second pressure adjusting bolt hole 54. And a spring 112 provided between the ball 111 and the second pressure adjusting bolt 113 to elastically support the ball 111 toward the second vertical discharge passage 47.

As shown in FIGS. 5 and 8, the third discharge check valve 120 is installed in a flow path of the pump body 30 connecting the low pressure pumping space 33 and the oil tank 20 to pump the high pressure. When the hydraulic oil in the low pressure pumping space 33 is recovered to the oil tank 20 side. The third discharge check valve 120 is provided in the low pressure oil discharge passage 57 to open and close the ball 121 and the third pressure regulating bolt 123 fastened to the third pressure adjusting bolt hole 56. And a spring 122 provided between the ball 121 and the third pressure adjusting bolt 123 to elastically support the ball 121 toward the low pressure oil discharge passage 57.

5 and 8, one end of the relief valve 140 is connected to the flow path of the pump body 30, and the other end thereof is positioned in the oil tank 20. When it is opened, some hydraulic oil in the high pressure pumping space 34 is recovered into the oil tank 20. The relief valve 140 is fastened to the relief valve hole 55 of the pump body 30, and has a relief body 141 having a through hole 142 formed in the inner center thereof, and one end of the relief body 141. Relief rod which is installed to slide the nut 143, the relief body 141 and the inner center of the nut 143, and the sharp part 145 is formed to open and close the through-hole 142 of the relief body 141 at one end 144 and a spring 146 which is provided between the lily fred 144 and the nut 143 to elastically support the sharp portion 145 of the lily fred 144 toward the through hole 142.

2 to 4, the solenoid valve 150 is installed on the outlet 32 side of the pump body 30 and connected to the controller 160 to be described later, the hydraulic hose 173 in the pump body 30 Controls the flow of hydraulic oil recovered to the pump body 30 side from the hydraulic oil pumped to the side or hydraulic hose.

As shown in FIG. 2, the controller 160 is connected to the driving motor 10 and the solenoid valve 150 to control them.

The portable automatic pump of the present invention in such a configuration is operated as follows.

First, when the controller 160 is operated, the drive motor 10 is driven by a power source, and the gear 76 connected thereto is rotated, and the drive shaft 73 connected to the gear 76 is rotated. When the drive shaft 73 is rotated, the eccentric cam 74 and the operating bearing 75 coupled to the periphery thereof are rotated. On one side of the outer circumferential surface of the actuating bearing 75, the head 62 of the high pressure piston 61 is always in close contact with the return spring 77.

Therefore, when the eccentric cam 74 and the actuating bearing 75 are rotated along the drive shaft 73, the high pressure piston 61 and the low pressure piston 63 contacted with the low pressure pumping space 33 by the eccentric amount of the eccentric cam 74. And a straight reciprocating transfer in the high pressure pumping space 34.

First, when the low pressure piston 63 and the high pressure piston 61 are reversed by the restoring force of the return spring 77, a vacuum is formed in the low pressure pumping space 33 and the high pressure pumping space 34, and thus the low pressure pumping space ( 33) and the suction force is generated in the high-pressure pumping space 34. By the suction force, the hydraulic oil in the oil tank 20 is sucked into the suction flow path 35 through the inlet 31 of the pump body 30, and the hydraulic oil sucked into the suction flow path 35 is the first suction check valve 80. After passing through the second and second suction check valve 90, the first suction passage 36 and the second suction passage 39 are sucked toward the low pressure pumping space 33 and the high pressure pumping space 34.

Here, the hydraulic oil sucked into the suction passage 35 flows in only one direction by the first suction check valve 80 and the second suction check valve 90, and the hydraulic oil of the suction passage 35 is first sucked. Only the flow passage 36 and the second suction passage 39 flow to the side, and conversely, the flow of the hydraulic oil in the first suction passage 36 and the second suction passage 39 to the suction passage 35 is blocked.

In this way, the hydraulic oil is sucked into the low pressure pumping space 33 and the high pressure pumping space 34 through two-pronged paths when the low pressure piston 63 and the high pressure piston 61 are reversed.

When the automatic pump is operated under no load, the first suction check valve 80 when the high pressure piston 61 and the low pressure piston 63 move forward while the driving shaft 73, the eccentric cam 74, and the operation bearing 75 are rotated. ) And the second suction check valve 90 is locked, so that various hydraulic oils in the low pressure pumping space 33 and the high pressure pumping space 34 are discharged from the first discharge passage 43 and the second discharge passage 46. Pumped at low pressure to the side. The first discharge check valve 100 is opened by the hydraulic oil pumped toward the first discharge passage 43. Accordingly, the hydraulic oil in the high pressure pumping space 34 passes through the first discharge check valve 100 and then discharges ( 32) is supplied to the side. Then, the second discharge check valve 110 is opened by the hydraulic oil pumped to the second vertical discharge passage 47, and thus the hydraulic oil in the low pressure pumping space 33 passes through the second discharge check valve 110. The second horizontal discharge passage 48 joins the first vertical discharge passage 44. The hydraulic oil joined to the first vertical discharge passage 44 is supplied to the outlet 32 along with the hydraulic oil pumped from the high pressure pumping space 34.

Therefore, when the automatic pump is operated in the no-load state, since the hydraulic oil of the low pressure as much as the pumping amount is supplied to the discharge port 32 side, it is possible to quickly proceed with the operation of the hydraulic tool connected to the discharge port (32).

If the driving motor 10 continues to operate under a high load on the outlet 32 side of the automatic pump, a large amount of hydraulic oil in the low pressure pumping space 33 is not discharged to the outlet 32 and the hydraulic oil in the high pressure pumping space 34 is maintained. Since the discharge port 32 is not discharged quickly, the high pressure pumping pressure is generated in the low pressure pumping space 33 and the high pressure pumping space 34.

Therefore, the remaining flow paths other than the suction passage 35, that is, the low pressure pumping space 33, the high pressure pumping space 34, the first suction passage 36, the second suction passage 39, the first discharge passage 43, The high pressure pumping pressure acts on the second discharge passage 46, the low pressure oil discharge passage 57, and the recovery passage 58. Therefore, the hydraulic oil in the high pressure pumping space 34 of the some high pressure hydraulic oil passes slowly through the first discharge passage 43 and the first discharge check valve 100, and then is slowly pumped toward the outlet 32. And the remaining high pressure hydraulic oil is recovered into the oil tank 20 through the low pressure oil discharge flow path 57 and the third discharge check valve 120, the recovery flow path 58 and the relief valve 140, in detail about this The explanation is as follows.

When a high load is applied to the outlet 32 side of the automatic pump, only a part of the hydraulic oil in the high pressure pumping space 34 is discharged to the outlet 32 side. Therefore, the hydraulic oil in the low pressure pumping space 33 is not discharged at all to the second discharge passage 46. In this state, when the low pressure piston 63 moves forward, the hydraulic oil in the low pressure pumping space 33 is pressurized to the low pressure oil discharge flow path 57 through the second suction flow path 39, and the third discharge check valve is operated by the pressing force. 120 is opened.

The third discharge check valve 120 allows the hydraulic oil to flow only from the low pressure oil discharge flow path 57 to the oil tank 20 side and blocks the reverse flow, so that a pressing force of a predetermined pressure or more acts on the low pressure oil discharge flow path 57. The third discharge check valve 120 opens and is recovered into the oil tank 20.

When the high load is applied to the outlet 32 of the automatic pump as described above, the hydraulic oil in the low pressure pumping space 33 is recovered into the oil tank 20 through the low pressure oil discharge passage 57.

On the other hand, when a high load is applied to the discharge port 32 side of the automatic pump, all of the hydraulic oil induction in the high-pressure pumping space 34 is not discharged to the discharge port 32 side but only a part thereof is discharged. When a certain pressure or more is applied to the recovery flow path 58 by the remaining hydraulic oil that cannot be discharged as described above, the relief valve 140 is opened while the spring 146 of the relief valve 140 is pressed by the pressure, and thus the high pressure pumping space. Some of the hydraulic oil which cannot be discharged to the discharge port 32 side of the hydraulic oil in the 34 are recovered to the oil tank 20 through the relief valve 140.

As such, when the piston 60 is operated under a high load on the outlet 32 side of the automatic pump, all the hydraulic oil in the low pressure pumping space 33 exceeding the reference pressure and some hydraulic oil in the high pressure pumping space 34 are oil. The tank 20 is recovered.

One of the features of the portable automatic pump of the present invention resides in the pump body 30, which has one inlet port 31 and one outlet port 32, The flow path is formed so that the hydraulic oil introduced is supplied to the outlet 32 after being pumped low pressure or high pressure. And another feature of the present invention, unlike the conventional pump body 30, a separate pump is not installed, only one relief valve 140 is installed. Therefore, low pressure pumping and high pressure pumping are performed by the pump body 30, the check valves installed therein, and one relief valve 140 when the driving motor 10 is operated. Therefore, the total number of parts of the automatic pump is reduced.

The present invention as described above, therefore, a pump body formed with a flow path to enable low pressure pumping and high pressure pumping, a piston installed in the pump body to pump hydraulic oil in the low pressure pumping space and the high pressure pumping space, and low pressure during high pressure pumping A third discharge check valve for recovering the hydraulic oil in the pumping space to the oil tank side, and a relief valve for opening some hydraulic oil in the high pressure pumping space to be recovered into the oil tank when the discharge pressure of the set pressure is applied to the hydraulic oil discharged to the outlet side. Since it consists of, separate pumps are installed and two relief valves were required compared to the prior art, the number of parts is reduced, thereby reducing the manufacturing cost, the overall size has the advantage of being easy to carry.

Claims (5)

A drive motor 10 installed on the base 12; An oil tank 20 installed below the base 12 and storing hydraulic oil; Low pressure pumping space 33 formed between the inlet 31 connected to the oil tank 20 and the outlet 32 through which the hydraulic oil introduced from the inlet 31 is discharged, and the inlet 31 and the outlet 32. ) And the high pressure pumping space 34 formed between the low pressure pumping space 33 and the outlet 32, and the low pressure pumping space after the hydraulic oil in the oil tank 20 flows into the inlet 31. 33) and a pump having a flow path formed to connect the inlet 31, the low pressure pumping space 33, the high pressure pumping space 34, and the outlet 32 so as to be discharged to the outlet 32 through the high pressure pumping space 34. Body 30; Installed in the low pressure pumping space 33 and the high pressure pumping space 34 of the pump body 30 so that the hydraulic oil in the oil tank 20 at the inlet 31, the low pressure pumping space 33, high pressure A piston (60) for suctioning toward the pumping space (34) and pumping the sucked hydraulic oil toward the discharge port (32); A piston reciprocating transfer means (70) installed in the oil tank (20) and connected to the drive motor (10) and the piston (60) to reciprocally transfer the piston (60) when the drive motor (10) is driven; It is installed in the flow path between the inlet 31 of the pump body 30 and the high pressure pumping space 34 so that hydraulic oil in the oil tank 20 is introduced only to the high pressure pumping space 34 and vice versa. A first suction check valve 80 which blocks discharge; It is installed in the flow path between the inlet 31 of the pump body 30 and the low pressure pumping space 33 so that the hydraulic oil in the oil tank 20 flows only into the low pressure pumping space 33 side and vice versa. A second suction check valve 90 to block the water; A first discharge check installed in the flow path between the high pressure pumping space 34 and the discharge port 32 to discharge hydraulic oil in the high pressure pumping space 34 to the discharge port 32 and vice versa; Valve 100; A second discharge check installed in the flow path between the low pressure pumping space 33 and the discharge port 32 to allow the hydraulic oil in the low pressure pumping space 33 to be discharged to the discharge port 32 and to prevent the discharge from the reverse direction; Valve 110; It is installed in the flow path of the pump body 30 connecting the interior of the low pressure pumping space 33 and the oil tank 20, the hydraulic oil in the low pressure pumping space 33 when the high pressure pumping to the oil tank 20 side A third discharge check valve 120 to be recovered; One end is connected to the flow path of the pump body 30 and the other end is located in the oil tank 20, and when the discharge pressure greater than the set pressure acts on the discharged hydraulic oil, some hydraulic oil in the high pressure pumping space 34 is opened. A relief valve 140 to allow the oil tank 20 to be recovered into the oil tank 20; A solenoid valve 150 installed at an outlet 32 side of the pump body 30 to control a flow of hydraulic oil being pumped; And a controller (160) connected to the drive motor (10) and the solenoid valve (150) to control them. According to claim 1, wherein the flow path of the pump body 30, Suction connected to the inlet 31 and the low pressure pumping space 33 and the high pressure pumping space 34 and guiding hydraulic oil introduced into the inlet 31 toward the low pressure pumping space 33 and the high pressure pumping space 34. With the flow path 35, The first suction check valve 80 is installed and connected to the suction flow path 35 and the high pressure pumping space 34 to guide the hydraulic oil introduced into the suction flow path 35 toward the high pressure pumping space 34. 1 suction passage 36, A second suction connection valve 90 connected to the suction flow path 35 and the low pressure pumping space 33 and guiding hydraulic oil introduced into the suction flow path 35 toward the low pressure pumping space 33. Suction flow path 39, A first discharge connected to the high pressure pumping space 34 and the outlet 32, the first discharge check valve 100 is installed, and guides the hydraulic oil introduced into the high pressure pumping space 34 to be pumped toward the outlet 32 side. Discharge passage 43, The hydraulic pressure flowed into the low pressure pumping space 33 and the first discharge passage 43 and the second discharge check valve 110 is installed and flows into the low pressure pumping space 33 toward the first discharge passage 43. A second discharge passage 46 for guiding pumping; The second suction passage 39 and the oil tank 20 and the third discharge check valve 120 is installed and the hydraulic oil in the low pressure pumping space 33 when the high pressure pumping the oil tank 20 Low pressure oil discharge passage 57 for guiding the discharge to Connected to the inside of the high pressure pumping space 34 and the oil tank 20, the relief valve 140 is installed, and during the high pressure pumping, some of the hydraulic oil in the high pressure pumping space 34 is recovered to the oil tank 20. Portable automatic pump, characterized in that consisting of a recovery passage 58 to guide. The method of claim 2, wherein the piston 60, One side is located in the low pressure pumping space 33 and the other side is inserted into the high pressure pumping space 34 and the high pressure piston 61 for pumping hydraulic oil in the high pressure pumping space 34 while reciprocating along the center thereof; , Supported at one end of the high pressure piston 61 and inserted into the low pressure pumping space 33 to the low pressure piston (63) for pumping hydraulic oil in the low pressure pumping space 33 while being reciprocated with the high pressure piston (61). Portable automatic pump, characterized in that made. According to claim 3, The piston reciprocating transfer means 70, A drive shaft 73 connected to the drive motor 10 and thereby rotated; An eccentric cam (74) coupled to the circumference of the drive shaft (73), One end is supported in the low pressure pumping space 33 and the other end is supported by the low pressure piston 63 so that one end of the high pressure piston 61 is elastically supported toward the eccentric cam 74. Portable automatic pump, characterized in that made. The method of claim 4, wherein around the eccentric cam 74, Portable automatic pump, characterized in that the actuating bearing (75) is further coupled to reduce the frictional resistance between the eccentric cam (74) and low pressure piston (63).

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