KR100871107B1 - Hand pump - Google Patents

Abstract

The present invention relates to a manual pump, an oil tank in which hydraulic oil is stored; An inlet connected to the oil tank and an outlet through which the hydraulic oil introduced from the inlet is discharged and a pumping space formed between the inlet and the outlet are provided therein, and the hydraulic oil in the oil tank passes through the pumping space after being introduced into the inlet. A pump body having a flow path formed to connect the inlet, the pumping space, and the outlet to be discharged toward the outlet; A piston installed to reciprocate in the pumping space of the pump body to suck hydraulic oil in the oil tank from the inlet to the pumping space, and to pump the sucked hydraulic oil to the outlet; An operating lever installed to rotate on the pump body and connected to the piston to reciprocate the piston; A suction valve installed at an inlet of the pump body to allow hydraulic oil in the oil tank to flow into the pumping space only and to prevent discharge from the reverse; A first check valve installed in the flow path between the suction valve and the pumping space to allow the hydraulic oil in the oil tank to only flow into the pumping space and to prevent it from being discharged in reverse; A second check valve installed in the flow path between the pumping space and the outlet to allow the hydraulic oil in the pumping space to be discharged to the outlet and to prevent the oil from being discharged in reverse; One end is connected to the flow path of the pump body and the other end is located in the oil tank, the relief valve for opening some hydraulic oil in the pumping space to be recovered into the oil tank while opening when the discharge pressure of the set pressure is applied to the discharged hydraulic oil It consists of;

Therefore, hydraulic pumping is performed by a pump body in which a flow path is formed to enable hydraulic pumping, and one suction valve and one relief valve installed in the pump body, thereby reducing the number of parts and thus reducing the manufacturing cost. It is reduced and the productivity is improved.

Oil tank, pump body, acceleration supply flow path, piston, operating lever, suction valve, first check valve, second check valve, relief valve

Description

Hand Pump

1 is a circuit diagram of a conventional manual pump

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

3 is a schematic partial side cross-sectional view of FIG.

4 is a top view of FIG. 3

5 is an enlarged view illustrating main parts of FIG. 3;

6a to 6f is a perspective view showing the appearance of the pump body, front view, rear view, right side view, top view, bottom view

7A to 7D are schematic front views showing a flow path of the pump body, a rear view showing a return flow path, a cross-sectional view along the line A-A 'of FIG. 7A, and a cross-sectional view along the line B-B' of FIG. 7A.

8 is a partial cross-sectional view showing a piston and a piston rod

9 is a partial cross-sectional view showing the hydraulic oil suction assembly.

10 is a partial cross-sectional view showing a relief valve

11 is a circuit diagram of a passive pump of the present invention

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

10: oil tank 11: tank cover

12: spindle 20: pump body

21: inlet 22: outlet

23: pumping space 24: pumping flow path

25: suction passage 26: discharge passage

27: first discharge path 28: second discharge path

29: recovery flow path 30: first recovery flow path

31: second recovery flow path 32: accelerated supply flow path

33: return euro 34: first return euro

35: second return flow path 36: return valve fastener

37: spindle height hole 38: first bolt hole

39: second bolt hole 40: support hole

41: return valve 42: set screw

43: handle 44: return check valve

45,71,81,91,101: Ball 46,72,82,92,102: Spring

47: hydraulic glass turn means 48: connector bolt

50: piston 51: piston rod

52: 1st bolt 53: 2nd bolt

60: operating lever 61: support

62: fixing pin 63: first hinge pin

64: second hinge pin 70: suction valve

73: multi-base 74: base hole

75: casing 76: casing hole

77 filter 80 first check valve

83: ball push 90: second check valve

100: relief valve 103: relief body

104,106: Through hole 105: Pressure adjusting bolt

107: Voldyce

The present invention relates to a manual pump, and more particularly to a manual pump capable of pumping hydraulic pressure in a simple structure.

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 rotating 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 changing the rotational motion to a linear reciprocating motion.

Among hydraulic pumps, reciprocating piston type manual 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, a small hydraulic tool, which is carried by a worker by hand, must be used by connecting the above-mentioned manual pump.

Such a reciprocating piston type manual 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 being lifted along the pumping space; It is connected to the pump body and the piston and consists of an operating lever for reciprocating the piston.

1 is a circuit diagram showing a problem of such a manual pump, which is provided with a low pressure suction valve (2), a low pressure check valve (3), a low pressure relief valve (4) in one flow path of the pump body, and the other of the pump body. The high pressure suction valve 5, the high pressure check valve 6 and the high pressure relief valve 7 are provided in the flow path.

Therefore, when the hydraulic oil is pumped in the state that the manual pump is not loaded, the hydraulic oil in the oil tank is discharged to the outlet side through the low pressure suction valve 2 and the low pressure check valve 3, and if the hydraulic oil pumped is excessive, It is recovered to the oil tank through the low pressure relief valve (4).

When hydraulic oil is pumped while the manual pump is loaded, the hydraulic oil in the oil tank is discharged to the outlet side through the high pressure suction valve (5) and the high pressure check valve (6). ) Is returned to the oil tank.

As described above, the conventional manual pump has a low pressure suction valve 2 and a high pressure suction valve 5 respectively installed to suck hydraulic oil in the oil tank, and a low pressure relief valve 4 and a high pressure relief valve to recover the hydraulic oil that is excessively pumped. (7) are provided respectively.

Therefore, in the conventional manual pump, two suction valves 2 and 5 and two relief valves 4 and 7 are installed to increase the number of parts, thereby increasing the manufacturing cost and increasing the manufacturing process.

An object of the present invention for solving the above problems is to provide a manual pump that allows the oil tank to be stably coupled to the pump body.

The manual pump of the present invention for achieving the above object, the oil tank is open at both ends and the hydraulic oil is stored; An inlet connected to one end of the oil tank and an outlet through which the hydraulic oil introduced from the inlet is discharged and a pumping space formed between the inlet and the outlet are provided therein, and the pumping space after the hydraulic oil in the oil tank flows into the inlet. A pump body having a flow path formed to connect the inlet, the pumping space, and the outlet to be discharged to the outlet side through the outlet; A piston installed to reciprocate in the pumping space of the pump body to suck hydraulic oil in the oil tank from the inlet to the pumping space, and to pump the sucked hydraulic oil to the outlet; An operating lever installed to rotate on the pump body and connected to the piston to reciprocate the piston; A suction valve installed at an inlet of the pump body to allow hydraulic oil in the oil tank to flow into the pumping space only and to prevent discharge from the reverse; A first check valve installed in the flow path between the suction valve and the pumping space to allow the hydraulic oil in the oil tank to only flow into the pumping space and to prevent it from being discharged in reverse; A second check valve installed in the flow path between the pumping space and the outlet to allow the hydraulic oil in the pumping space to be discharged to the outlet and to prevent the oil from being discharged in reverse; One end is connected to the flow path of the pump body and the other end is located in the oil tank, the relief valve for opening some hydraulic oil in the pumping space to be recovered into the oil tank while opening when the discharge pressure of the set pressure is applied to the discharged hydraulic oil ; A tank cover coupled to the other end of the oil tank, one end is fastened to the relief valve, the other end is passed through the tank cover and protrudes outwards, and the end of the spindle protruding out of the tank cover It is characterized in that the oil tank support portion made of a fastening nut for close contact with the oil tank and the tank cover to the pump body side.

Another feature of the manual pump of the present invention is that the flow path of the pump body is connected to the pumping space and is formed long downward so that when the piston is elevated along the pumping space to guide the hydraulic oil in the oil tank to the pumping space side Or a pumping passage for guiding the hydraulic oil in the pumping space side to the outlet side, a suction passage connected to the inlet and the pumping passage, the first check valve is installed, and guiding the hydraulic oil introduced into the inlet to the pumping passage side; A discharge flow path connected to the pumping flow path and the discharge port, the second check valve is installed, and guides the hydraulic oil pumped from the pumping space to the pumping flow path to the discharge port, and one end is connected to the pumping space and the other end of the relief valve Is connected to the hydraulic oil in the pumping space to be recovered to the oil tank side It is formed between the guiding recovery passage, and the acceleration supply passage formed between the inlet and the recovery passage of the pump body to guide the hydraulic oil flowing into the inlet when the piston rises directly into the pumping space.

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In the present invention, when the manual pump is operated under no load, the piston is lowered when the operation lever is lowered to lock the intake valve and the first check valve, thereby discharging a large amount of hydraulic oil in the pumping space and the pumping flow path. The pumped hydraulic oil is discharged to the outlet through the second check valve opened by the pumping pressure. In addition, when the operating lever is lowered while the high load is applied to the discharge port side of the manual pump, the hydraulic pressure in the pumping space and the pumping flow path is not discharged quickly to the discharge side, and the pumping pressure is generated in the pumping space. Accordingly, hydraulic pumping pressure acts on the pumping space, the pumping flow path, and the recovery flow path, and some hydraulic oils are slowly pumped to the discharge flow path, and are recovered into the oil tank through the recovery flow path by the relief valve opened by the pressure of the remaining hydraulic oil. do.

Therefore, hydraulic pumping is performed by the pump body having the flow path formed therein and one suction valve and one relief valve installed in the pump body, thereby reducing the number of parts, thereby reducing the manufacturing cost and improving the productivity by reducing the manufacturing process. do.

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

FIG. 2 is a schematic perspective view showing a manual pump of the present invention, FIG. 3 is a schematic partial side cross-sectional view of FIG. 2, and FIG. 4 is a plan view of FIG. 3. 5 is an enlarged view illustrating main parts of FIG. 3, and FIGS. 6A to 6F are perspective views, front views, rear views, right side views, top views, and bottom views showing the appearance of the pump body, and FIGS. 7A to 7D are flow paths of the pump body. Fig. 7A is a sectional front view showing a return flow path, a sectional view taken along the line A-A 'of Fig. 7A, and a sectional view taken on the line B-B' of Fig. 7A.

Such a manual pump of the present invention includes an oil tank 10, a pump body 20 coupled to the oil tank 10, a piston 50 installed in the pump body 20, a piston 50, and The operating lever 60 installed in the pump body 20, the suction valve 70 installed in the inlet 21 of the pump body 20, and the inlet ( 21 is installed on the first check valve 80 and the second check valve 90 and the pump body 20 to allow the hydraulic oil introduced into the outlet 22 to be discharged to the oil tank. It consists of a relief valve 100 to be recovered to the (10) side.

As shown in FIGS. 2 to 4, the oil tank 10 is open at both sides, and the open side is coupled to the pump body 20. The oil tank 10 is supported by the pump body 20 by the oil tank support 14 of the present invention. The oil tank support part 14 includes a tank cover 11 coupled to the other end of the oil tank 10, one end of which is coupled to the relief valve 100, and the other end of the oil tank support 11 protrudes outward from the tank cover 11. The fastening nut 13 which is fastened to the spindle 12 and the end of the spindle 12 protruding outward from the tank cover 11 to closely contact the oil tank 10 and the tank cover 11 toward the pump body 20. Is done.

3, 5, 6 and 7, the pump body 20, the inlet 21 is formed so as to be connected to the oil tank 10 on one side inside, the inlet 21 on the other side inside. A discharge port 22 is formed so that the hydraulic oil introduced from the discharge port is discharged, and a pumping space 23 connected to the inlet port 21 and the discharge port 22 is formed in the upper side of the inner side. The flow path of the pump body 20 is such that the hydraulic oil in the oil tank 10 flows into the inlet 21 and then passes through the pumping space 23 to the outlet 22. It is formed to connect the outlet 22.

The configuration of the pump body 20 will be described in more detail with reference to FIGS. 7A to 7D as follows.

The inlet 21 of the pump body 20 clearly shown in FIGS. 7A and 7C includes a filter 77, a multibase 73, a suction valve 70, and a ball casing 75 shown in FIG. 9. The hydraulic oil suction assembly is installed so that the hydraulic oil in the oil tank 10 flows into the inlet 21 of the pump body 20 through the hydraulic oil suction assembly.

A connector bolt 48 shown in FIG. 3 is coupled to the outlet 22 of the pump body 20 shown in FIGS. 7B to 7D, and a coupler (not shown) is formed on the connector bolt 48. (Not shown) is connected, and the coupler of the hydraulic hose is connected to a hydraulic tool (not shown) so that the hydraulic pressure of the manual pump is supplied.

A pumping passage 24 is connected to the pumping space 23 of the pump body 20 of FIGS. 7A and 7C. The pumping passage 24 is connected to the pumping space 23 and is formed long downwardly so that the hydraulic oil in the oil tank 10 is pumped to the pumping space side when the piston 50 to be described later is lifted along the pumping space 23. Or guide the hydraulic oil of the pumping space 23 side to the outlet 22 side.

A suction passage 25 shown in FIG. 7C is formed between the inlet 21 of the pump body 20 and the pumping passage 24. The suction passage 25 is connected to the inlet 21 and the pumping passage 24, and a first check valve 80 to be described later is installed thereon, and the hydraulic oil introduced into the inlet 21 is pumped to the pumping passage 24. To guide.

A discharge passage 26 shown in FIG. 7C is formed between the pumping passage 24 and the discharge port 22 of the pump body 20. The discharge passage 26 is connected to the pumping passage 24 and the outlet 22, and the second check valve 90 is installed therein, and discharges hydraulic oil which is pumped from the pumping space 23 to the pumping passage 24. Guide).

The discharge passage 26 includes a first discharge passage 27 and a second discharge passage 28. The first discharge passage 27 is formed on the same horizontal line as the suction passage 25, and has one end connected to the pumping passage 24 and a first bolt hole having the first bolt 52 fastened to the other end thereof. 38) is connected, and the second bolt hole 39 to which the second bolt 53 is fastened is connected to the lower side of the central portion thereof. A lower end of the second discharge passage 28 is connected to an upper portion of the first discharge passage 27, and an outlet 22 is connected to an upper end of the second discharge passage 28.

7A and 7C, a recovery passage 29 is formed in the pump body 20 so that hydraulic oil in the pumping space 23 is recovered to the oil tank 10 side. The recovery flow path 29 has one end connected to the pumping space 23 and the other end connected to a relief valve 100 to be described later to guide the hydraulic oil in the pumping space 23 to be recovered to the oil tank 10 side. The recovery passage 29 is connected to the pumping space 23 and is formed in a vertical direction with the first recovery passage 30, one end connected to the first recovery passage 30, and the other end connected to the oil tank 10. It consists of a second recovery passage 31 in the horizontal direction.

Between the inlet 21 and the recovery passageway 29 of the pump body 20, hydraulic oil flowing into the inlet 21 when the piston 50 rises as shown in FIGS. 7A and 7C pumps the space 23. Accelerated supply passage 32 is formed to be directly introduced into the. The accelerated supply passage 32 is formed to be inclined as a whole, the lower end thereof is connected to the inlet 21, and the upper end thereof is connected to the second recovery passage 31 of the recovery passage 29.

In the outlet 22 of the pump body 20, as shown in FIGS. 7A, 7B, and 7D, the hydraulic pressure acting on the outlet 22 side is released, that is, a hydraulic hose connected to the outlet 22 (not shown). Return flow path 33 is connected so that the hydraulic oil in the) is recovered back to the oil tank (10). The return flow path 33 has a first return flow path 34 having one end connected to the outlet 22 and the other end connected to the return valve fastening hole 36, and one end connected to the first return flow path 34 and the other end. It consists of a second return passage 35 connected to the oil tank (10).

In the return passage 33 of the pump body 20, as shown in FIG. 7D, the hydraulic oil on the outlet 22 side is transferred to only the second return passage 35 through the first return passage 34. The return check valve 44 which consists of 45 and the spring 46 is provided.

The return valve fastening hole 36 of the pump body 20 includes a set screw 42 fastened to the return valve fastening hole 36 and a handle 43 screwed to the set screw 42 ( 41) is combined. Since the pressure of the spring 46 of the return check valve 44 is adjusted by operating the handle 43 of the return valve 41, the opening and closing time of the return check valve 44 can be adjusted. That is, when the handle 43 is rotated so that the pressure of the spring 46 of the return check valve 44 is lower than the hydraulic pressure in the outlet 22, the return check valve 44 opens and the hydraulic oil on the outlet 22 side returns to the return passage ( 33) is recovered into the oil tank (10).

Here, the return passage 33 and the return valve fastening opening 36 formed in the pump body 20, the return valve 41 and the return check valve coupled to the return passage 33 and the return valve fastening opening 36 Reference numeral 44 is referred to as hydraulic glass turn means 47.

Reference numeral 40 of the components constituting the pump body 20 is a support hole to which the support 61 to be described later will be coupled.

The piston 50 is installed to reciprocate in the pumping space 23 of the pump body 20 as shown in FIGS. 3 to 5 and 8 to pump hydraulic oil in the oil tank 10 at the inlet port 21. It suctions to the space 23 side, and pumps the suctioned hydraulic oil to the discharge port 22 side. A piston rod 51 is connected to a lower end of the piston 50, and the piston rod 51 is inserted into the pumping flow passage 24 so that the hydraulic oil in the oil tank 10 when the piston 50 is elevated is pumped. Suction to 24 or pump the oil in the pumping flow passage 24 to the outlet 22 side.

3 to 5, the operation lever 60 is installed to be rotated to the pump body 20 and is connected to the piston 50 to reciprocate the piston 50. One end of the support 61 is coupled to the operation lever 60 by the first hinge pin 63. The other end of the support 61 is coupled to the fixing pin 62 in the state inserted into the support hole 40 of the pump body 20. And the operating lever 60 and the piston 50 is coupled to the second hinge pin (64). Therefore, when the free end of the operating lever 60 is raised and lowered, the operating lever 60 is rotated about the first hinge pin 63 to raise and lower the piston 50 coupled thereto.

As shown in FIG. 9, the suction valve 70 is installed at the inlet 21 of the pump body 20 so that the hydraulic oil in the oil tank 10 flows only into the pumping space 23 and is discharged in reverse. Block it.

The suction valve 70 has a ball 71 for opening and closing the base hole 74 of the multi base 73 and a ball casing 75 having one end supported by the ball 71 and the other end fastened to the multi base 73. ) And a spring 72 for supporting the ball 71 toward the base hole 74 side. The filter 77 is coupled to the other end of the multi-base 73 so that the hydraulic oil in the oil tank 10 is filtered when it flows into the base hole 74 of the multi-base 73.

Therefore, when the operation lever 60 is raised to form a vacuum in the pumping space 23, the suction valve 70 is opened by the suction force, and the hydraulic oil in the oil tank 10 passes through the multi-base 73 through the filter 77. It is sucked into the base hole 74 and then flows into the casing hole 76 of the ball casing 75.

The first check valve 80 is installed in the suction passage 25 between the suction valve 70 and the pumping space 23, as shown in Figs. Is to be introduced only to the pumping space 23 side and prevent the discharge to the reverse.

The first check valve 80 includes a ball 81 that opens and closes the casing hole 76 of the ball casing 75, and hydraulic oil that flows around the ball 81 while supporting one side of the ball 81. A ball push 83 penetrated to pass through the inside thereof, and one end supported by the ball push 83 and the other end supported by the inside of the suction flow path 25 to support the ball push 83 toward the ball 81 side. Consists of 82.

Therefore, when the hydraulic oil in the oil tank 10 is sucked into the pumping flow path 24, the spring 81 is compressed by the suction force, so that the ball 81 is spaced apart from the casing hole 76 and accordingly the first check valve ( 80 is opened, and the hydraulic oil passing through the suction valve 70 is supplied to the pumping flow path 24 through the first check valve 80.

As shown in FIGS. 3 and 5, the second check valve 90 is installed in the first discharge passage 27 between the pumping space 23 and the discharge port 22 so that the hydraulic oil in the pumping space 23 is removed. It is to be discharged to the outlet 22 side through the two discharge passage 28 and to block the discharge to the reverse.

The second check valve 90 has a ball 91 for opening and closing the first discharge passage 27, one end of which is supported by the ball 91, and the other end of which is supported by the first bolt 52. It is made of a spring 92 to elastically support.

Therefore, when the operating lever 60 and the piston 50 and the piston rod 51 are lowered and the oil in the pumping space 23 and the pumping flow passage 24 is pumped toward the first discharge flow path 27, the ball is pumped by the pumping pressure. As the 91 is pushed and the spring 92 is compressed, the second check valve 90 is opened. When the second check valve 90 is opened, the oil in the first discharge passage 27 is supplied to the outlet 22 through the second discharge passage 28.

Here, when the first bolt 52 is rotated such that the first bolt 52 is inserted into the first bolt hole 38 or is drawn out of the first bolt hole 38, the second check supported at the end thereof is supported. The pressure of the spring 92 of the valve 90 can be adjusted, and thus the opening and closing time of the second check valve 90 can be adjusted according to the pumping pressure.

7A, 7D, 10, and 11, one end of the relief valve 100 is connected to the second return passage 31 of the pump body 20 and the other end is positioned in the oil tank 10. Thus, when a discharge pressure of a predetermined pressure or more acts on the discharged hydraulic oil, the hydraulic oil is opened to recover some hydraulic oil in the pumping space 23 into the oil tank 10.

The relief valve 100 has a through-hole 104 formed therein, one end of which is coupled to the second return passage 31 of the pump body 20, and the other end of which is located within the oil tank 10. And a ball 101 positioned in the through-hole 104 of the relief body 103 to open and close it, and a ball dice 107 provided inside the relief body 103 to support the ball 101 at one end thereof. ), A pressure adjusting bolt 105 fastened to the other end of the relief body 103, and provided inside the relief body 103, one end of which is supported by the ball die 107 and the other end of the pressure adjusting bolt 105. It consists of a spring 102 that is supported.

The above-described relief valve 100 opens when the operation lever 60 is lowered in a state where a high load is applied to the outlet 22 of the manual pump, and serves to recover the residual flow rate exceeding the reference pressure to the oil tank. .

That is, when the operation lever 60 is lowered while the high load is applied to the outlet 22 side of the manual pump, the hydraulic oil in the pumping space 23 and the pumping passage 24 is not quickly discharged to the outlet side, and thus the pumping space 23 In the pumping pressure is generated. Accordingly, the pumping pressure is applied to the pumping space 23, the pumping passage 24, and the recovery passage 29, and some hydraulic oil is slowly pumped toward the discharge passage 26, and the remaining hydraulic oil is opened by hydraulic pressure. By 100, the first recovery passage 30 and the second recovery passage 31 are recovered into the oil tank.

The process of opening the relief valve 100 when the hydraulic pressure acts on the recovery flow path 29 is as follows. When hydraulic fluid flows through the first and second recovery passages 30 and 31 toward the through hole 104 of the relief body 103, the ball 101 and the ball die 107 are pushed and the spring 102 is pushed. When the relief valve 100 is opened in this way, the hydraulic pressure is recovered to the oil tank 10 through the through hole 106 of the pressure adjusting bolt 105.

Here, the pressure adjusting bolt 105 fastened to the relief body 103 is inserted into the relief body 103 or rotated so that the pressure adjusting bolt 105 is drawn out of the relief body 103 to be supported at the end thereof. The pressure of the spring 102 can be adjusted, and thus the opening and closing time of the relief valve 100 according to the pumping pressure can be adjusted.

The manual pump of the present invention in this configuration is operated as follows.

First, when the operation lever 60 is raised upwards, the piston 50 is lifted, and a vacuum is formed in the pumping space 23 and the pumping flow passage 24. Accordingly, the suction valve 70 is opened to open the inlet of the pump body 20. Hydraulic oil flows into the (21) side.

The hydraulic oil introduced into the inlet 21 is introduced into the pumping space 23 and the pumping passage 24 through the two suction paths. That is, the hydraulic oil on the inlet 21 side is directly sucked into the pumping space 23 through the second recovery passage 31 and the first recovery passage 30 through the acceleration supply passage 32.

In addition, the suction force acts on the suction flow path 25 by the suction force of the vacuum pumping flow path 24. Accordingly, the hydraulic oil on the inlet port 21 is sucked toward the suction flow path 25 and the first check valve 80 is provided. Will be opened. Therefore, the hydraulic oil sucked into the suction flow path 25 from the inlet 21 of the pump body 20 is filled with the pumping flow path 24 after passing through the first check valve 80.

When the manual pump is operated under no load state, when the operation lever 60 is lowered, the piston 50 is lowered to lock the intake valve 70 and the first check valve 80, thereby pumping space 23. ) And a large amount of hydraulic oil in the pumping passage 24 are pumped toward the first discharge passage 27. The second check valve 90 is opened by the hydraulic oil pumped toward the first discharge passage 27, so that the oil in the pumping space 23 and the pumping passage 24 passes through the second check valve 90. After the second discharge passage 28 is supplied to the outlet 22 side.

Therefore, when the manual pump is operated under no load, the hydraulic oil is supplied in a large amount to the outlet 22 as much as the pumping amount, so that the operation of the hydraulic tool connected to the outlet 22 can be quickly proceeded.

When the operation lever 60 is lowered in a state where a high load is applied to the outlet 22 side of the manual pump, the hydraulic oil in the pumping space 23 and the pumping passage 24 is not quickly discharged to the outlet 22 side, so the pumping space ( 23) and a pumping pressure is generated in the pumping passage 24.

Therefore, pumping pressure is applied to the pumping space 23, the pumping passage 24, and the recovery passage 29, so that some hydraulic oil passes through the first discharge passage 27 and the second check valve 90, and then the second It is pumped slowly to the discharge flow path 28 and the discharge port 22 side. The remaining hydraulic oil flows into the first recovery passage 30 and the second recovery passage 31 to pressurize the relief valve 100, and is recovered to the oil tank 10 through the relief valve 100 opened by the hydraulic oil. do.

As such, when operating the operation lever 60 in a state where a high load is applied to the outlet 22 side of the manual pump, the hydraulic oil in the pumping space 23 exceeding the reference pressure is supplied to the oil tank 10 through the relief valve 100. ) Is recovered.

One of the characteristics of the manual pump of the present invention is that the pump body 20, the pump body 20 has one inlet port 21 and one outlet port, the hydraulic oil flowing into the inlet port 21 The flow path is formed to be supplied to the outlet 22 after being pumped. And another feature of the present invention is that only one suction valve 70 and one relief valve 100 are installed in the pump body 20. Therefore, pumping is performed by the pump body 20 and one suction valve and one relief valve 100 when the operation lever 60 is operated. Therefore, the total number of parts of the hand pump is reduced.

In the present invention as described above, since the pumping is made by the pump body formed with a flow path to enable the pump and one suction valve and one relief valve installed in the pump body, the number of parts is reduced and thus manufacturing cost is reduced. In addition, productivity is reduced due to reduced manufacturing processes.

Claims (5)

delete Oil tank 10 is open at both ends and the hydraulic oil is stored; A pumping space formed between an inlet port 21 connected to one end of the oil tank 10 and an outlet port 22 through which hydraulic oil introduced from the inlet port 21 is discharged, and the inlet port 21 and the outlet port 22 ( 23 is provided, the inlet 21, the pumping space 23 so that the hydraulic oil in the oil tank 10 flows into the inlet 21 and then discharged through the pumping space 23 toward the outlet 22 side. ), A pump body 20 in which a flow path is formed to connect the outlet 22; One end is connected to the outlet 22 and the other end is connected to the return passage 33 in the oil tank 10, and the return passage 33 is installed in the hydraulic oil in the return passage 33 is the oil tank ( 10, the return check valve 44 to control to flow only to the side, and the return valve coupled to the pump body 20 to be connected to the return check valve 44 to control the opening and closing of the return check valve 44 ( Hydraulic glass turn means (47) comprising: 41; It is installed to reciprocate in the pumping space 23 of the pump body 20 to suck the hydraulic oil in the oil tank 10 from the inlet 21 to the pumping space 23 side, the suctioned hydraulic oil to the outlet A piston 50 pumping to the side 22; An actuating lever (60) installed to rotate in the pump body (20) and connected to the piston (50) to reciprocate the piston (50); An intake valve 70 installed at the inlet 21 of the pump body 20 to allow the hydraulic oil in the oil tank 10 to only flow into the pumping space 23 and to block the discharge from the reverse; The first check is installed in the flow path between the intake valve 70 and the pumping space 23 so that the hydraulic oil in the oil tank 10 only flows into the pumping space 23 side and prevents the discharge from the reverse Valve 80; The second check valve 90 is installed in the flow path between the pumping space 23 and the outlet 22 so that the hydraulic oil in the pumping space 23 is discharged to the discharge port 22 side and blocked from being discharged in the reverse direction. ); One end is connected to the flow path of the pump body 20 and the other end is located in the oil tank 10, so that some hydraulic oil in the pumping space 23 is opened when a discharge pressure greater than a set pressure is applied to the discharged hydraulic oil. A relief valve 100 for recovering into the oil tank 10; A tank cover 11 coupled to the other end of the oil tank 10, a spindle 12 having one end coupled to the relief valve 100 and the other end penetrating through the tank cover 11 and protruding outwardly thereof; And a fastening nut 13 fastened to an end of the spindle 12 protruding outward from the tank cover 11 to closely contact the oil tank 10 and the tank cover 11 toward the pump body 20. In the manual pump is provided with an oil tank support 14 made of, The flow path of the pump body 20, It is connected to the pumping space 23 and is formed to be long downward so that when the piston 50 is elevated along the pumping space 23 to guide the hydraulic oil in the oil tank 10 to the pumping space side or the pumping space A pumping flow passage 24 for guiding hydraulic oil on the side of 23 to the discharge port 22 side; A suction passage 25 connected to the inlet 21 and the pumping passage 24 and provided with the first check valve 80 and guiding hydraulic oil introduced into the inlet 21 toward the pumping passage 24; , The hydraulic fluid connected to the pumping passage 24 and the outlet 22, the second check valve 90 is installed, and is pumped from the pumping space 23 to the pumping passage 24 toward the outlet 22. Discharge flow path 26 to make, A recovery flow path 29 having one end connected to the pumping space 23 and the other end connected to the relief valve 100 to guide the hydraulic oil in the pumping space 23 to be recovered to the oil tank 10 side; It is formed between the inlet 21 and the recovery passageway 29 of the pump body 20 to guide the hydraulic oil flowing into the inlet 21 when the piston 50 rises directly into the pumping space 23. Manual pump, characterized in that consisting of an acceleration supply passage (32). delete delete delete

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