KR20080046141A - Hydraulic pump having air compression ability - Google Patents

Abstract

A hydraulic pump having air compression ability is provided to discharge hydraulic oil by operating a plunger through air pressure and to generate compressed air through reciprocation of a piston. A hydraulic pump having air compression ability includes a valve body(20), a spool(30), an operating shaft(40), plunger blocks, plungers, and pistons. The valve body has a pressure source connection port, a spool operating chamber communicated with the pressure source connection port, piston operating chambers at both sides of the spool operating chamber, and A and B port pipelines(24A,24B). The spool is installed in the spool operating chamber to communicate a P chamber with an A or B chamber. The operating shaft is inserted into the spool, supported on the valve body to be linearly moved, and has spool transferring pilot pipelines(40a,40a'). The plunger blocks are coupled with both ends of the valve body respectively and have plunger operating chambers, high pressure inlets and outlets, and low pressure inlets and outlets. The plungers are coupled with both ends of the operating shaft to be slidingly inserted into the plunger operating chambers. The pistons are inserted into the piston operating chambers respectively to be connected to both ends of the operating shaft.

Description

Hydraulic pump having air compression ability

The present invention relates to a device that combines the functions of the air compressor and the hydraulic pump, and in particular, can optionally be used in combination with the air compressor and pressure oil pumping device, can double the operating force in the configuration of the back pressure line, and improve the operation reliability of the spool The present invention relates to a hydraulic pump having an improved air compression function.

Conventionally, a pump device for pumping compressed air or pressure oil using an externally operated solenoid valve has been constructed. That is, it is a structure which pumps by varying a flow path by the repetitive switching operation of a solenoid valve, and reciprocating an operation shaft.

Thus, when the pumping device is electrically configured by using the solenoid valve, the failure rate is high. In addition, there was no way to double the operating force of the solenoid valve.

Therefore, the present invention was created in view of the above circumstances, and the reciprocating motion of the spool can be automatically generated, thereby enabling the use of an air compressor and a pressure oil pumping device. It is an object of the present invention to provide a hydraulic pump having a reliable air compression function.

Specific means of the present invention for achieving the above object,

The pressure source connection port, the spool operating chamber in communication with the pressure source connecting port, the piston operating chambers respectively provided on both sides of the spool operating chamber, and the left and right sides of the P chamber and the P chamber connected to the pressure source connecting port in the spool operating chamber. A and B chambers are respectively formed in the valve body comprising an A and B port pipes for connecting the A and B chambers and the piston operation chamber, respectively;

A spool installed in the spool operating chamber for communicating the P chamber to the A chamber or the B chamber according to the switching movement position;

An operating shaft inserted into the spool and supported linearly on the valve body and having a spool conveying pilot pipe for transferring the spool;

A plunger block each coupled to both ends of the valve body, the plunger block having a high pressure suction and discharge port respectively connected to the plunger operation chamber and the plunger operation chamber, and a low pressure suction and discharge port respectively connected to the piston operation chamber;

A plunger connected to both ends of the operating shaft and slidably inserted into the plunger operating chamber;

It is characterized in that it comprises a piston which is respectively inserted into the piston operating chamber connected to both ends of the operating shaft.

Also according to the invention,

The spool further includes a pilot passage for supplying the pressure oil of the P chamber to the A chamber or the B chamber for initial operation.

Also according to the invention,

A port pipe line and the low pressure inlet, outlet port is connected through the first power line, so that the B port pipe line and the low pressure inlet, outlet port is connected through the second power line to act on the piston.

Also according to the invention,

The valve body is characterized in that the spool operating pressure correction pipe is further provided.

Also according to the invention,

The valve body is characterized in that the pipe connection hole for the external valve operation is further provided.

According to the hydraulic pump having the air compression function of the present invention, it is possible to discharge the pressurized oil by operating the plunger by pneumatic pressure, and at the same time it is possible to produce the compressed air by reciprocating the piston. In addition, when the back pressure line is configured, the operating force of the piston is doubled, so that the apparatus can be compactly configured. In addition, since the initial operation line for releasing the neutral position of the spool is improved, the operation reliability is improved. It can also be configured small, which provides the advantage of taking up a small installation space.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an assembled cross-sectional view of a hydraulic pump having an air compression function according to an embodiment of the present invention, Figure 2 is an enlarged view of the spool applied to the present invention in a neutral state, Figure 3 is a switching position of the spool in Figure 1 The operation state diagram according to

In FIG. 1, reference numeral 20 denotes a 'valve body'.

The valve body 20 has a pressure source connection port 21 into which a working fluid is introduced, a spool operation chamber 22 in communication with the pressure source connection port 21, and a spool operation chamber 22, respectively. A and B chambers are provided in both the P chamber P and the P chamber P, which are in communication with the pressure source connection port 21, in the piston operating chambers 23A and 23B provided, and the spool operation chamber 22, respectively. (A, B) is formed, and has A and B port pipe lines 24A and 24B which respectively connect the A and B chambers A and B and the piston operation chambers 23A and 23B.

The spool operation chamber 22 is provided with a spool 30 for communicating the P chamber P to the A chamber A or the B chamber B depending on the movement position. The spool 30 has a pilot passage 31 for supplying the pressure oil of the P chamber P to the A chamber A or the B chamber B for the initial operation. Unexplained symbol '30a' is a 'spool discharge hole'.

The pilot passage 31 is configured to communicate the P chamber P and the A chamber A when the spool 30 has stopped at the neutral position as shown in FIG. Therefore, the pressure of the working fluid introduced into the pressure source connection port 21 is spooled through the P chamber (P) A chamber (A) → spool working pressure correction pipe (1) → external pipe operation pipe connection hole (2). It acts on the right end surface of (30). This causes the spool 30 to switch to the left.

The operation shaft 40 is inserted in the spool 30, and the operation shaft 40 is supported by the valve body 20 so as to be linearly movable. The working shaft 40 has spool feeding pilot pipe lines 40a and 40a 'for switching and transferring the spool 30, and the spool feeding pilot pipe lines 40a and 40a' are connected to the spool working pipe lines 40b and 40b, respectively. 40b ').

Plunger blocks 50A and 50B are provided at both ends of the valve body 20, respectively. The plunger blocks 50A and 50B are respectively connected to the plunger operating chambers 51a and 51b, the high pressure inlets 52a and 52b and the high pressure outlets 52a 'and 52b', respectively, in communication with the plunger operating chambers 51a and 51b. Low pressure suction ports 53a and 53b and low pressure discharge ports 53a 'and 53b' respectively connected to the piston operating chambers 23A and 23B are provided.

Plungers 60A and 60B, which are slidably inserted into the plunger operating chambers 51a and 51b, are connected to both ends of the operating shaft 40, respectively.

Pistons 70A, 70B are slidably inserted in the piston operating chambers 23A, 23B, respectively, and the pistons 70A, 70B are connected to both ends of the operating shaft 40. Pistons 70A and 70B are provided with compression rings.

The operation of this embodiment configured as described above will be described.

First, check valves 110a and 110a 'are connected to one side of the high pressure inlet and outlet outlets 52a and 52a', respectively, and check valves 110a and 110a 'are connected to the other high pressure inlet and outlet outlets 52b and 52b'. 110b and 110b 'are connected, oil tanks (not shown) are connected to the check valves 110a and 110b, and a hydraulic system having hydraulic actuators (not shown) is connected to the discharge side check valves 110a' and 110b '. Can be connected.

Unexplained symbol 'T' is 'exhaust ball'.

<When operated by hydraulic pump>

When air pressure is supplied to the pressure source connecting port 21 while the spool 30 is switched to the right as shown in FIG. 1, the pressure source is connected to the A port pipe 24A.

Therefore, the working fluid of the pressure source supplied to the pressure source connection port 21 is supplied to the left chamber of the right piston operating chamber 23A through the A port pipe 24A, and the right piston 70A moves to the right to the right. The plunger 60A enters the plunger operating chamber 51a and at the same time the fluid in the operating chamber 51a is compressed and discharged to the high pressure discharge port 110a '.

At the same time, the plunger 60B on the left side moves to the right through the operating shaft 40, and a negative pressure is generated in the plunger operating chamber 51b to suck the fluid through the high pressure suction port 52b.

When the working shaft 40 is moved to the right in this way, the spool feed pilot pipe line 40a in the working shaft 40 is positioned as shown in FIG. Therefore, the pilot pressure of the working fluid acts on the right end surface of the spool 30 through the spool operation pipe connection hole 40b → the spool feed pilot pipe path 40a. Therefore, the spool 30 is shifted to the left as shown in FIG. 3 by the pilot pressure.

As a result, the P chamber P is connected to the B port pipe 24B. Therefore, the pneumatic pressure pushes the left piston 70B to the left, and the working shaft 40 is moved to the left. As a result, the left plunger 60B pumps the fluid from the plunger operating chamber 51b to the high pressure discharge port 52b ', and the right plunger 60A is discharged from the plunger operating chamber 51a, thereby forming a negative pressure to absorb high pressure. Fluid is sucked into the inlet 52a.

In this way, when the operation shaft 40 is completed to move to the left, the spool feed pilot pipeline 40a in the operation shaft 40 is positioned as shown in FIG.

Afterwards, the pilot pressure of the working fluid acts on the left end surface of the spool 30 through the spool operation pipe connection hole 40b '→ the spool feed pilot pipe path 40a'. Therefore, the spool 30 is moved to the right again as shown in FIG. 1 by the pilot pressure.

As described above, according to the present invention, the operation shaft 40 repeats the reciprocating motion from side to side in accordance with the switching operation of the spool 30, and as a result, the negative pressure and the constant pressure occur continuously in the plunger operation chambers 51a and 51b. Pressure oil is discharged to 52a'52b 'side to pump.

<When used as an air compressor>

On the other hand, as described above, the pistons 70A and 70B reciprocate in accordance with the switching positions of the spool 30, and suction and compression forces are continuously generated in the piston operating chambers 23A and 23B, thereby reducing the pressure from the low pressure suction inlets 53a and 53b. Air is sucked in and compressed air is discharged to the low pressure discharge port 53a '53b'.

As such, the present invention may be an air compressor for obtaining pneumatic pressure using a single pressure source or a hydraulic pump for discharging pressure oil.

When used as an air compressor, the high pressure suction and discharge ports 52a, 52a ', 52b, 52b' may be deleted and configured as shown in FIGS. 4 and 5. 4 and 5 are diagrams showing the operation state according to the switching operation of the spool as an exemplary view composed of a compressor according to the present invention.

At this time, check valves 120a, 120b, 120a ', and 120b' are respectively connected to the low pressure inlets 53a and 53b and the low pressure outlets 53a 'and 53b' to prevent backflow.

On the other hand, in the present invention, the A port conduit 24A and the low pressure suction and discharge port 53b or 53b 'are connected through the first power supply line 100 so as to give back power to the pistons 70A and 70B. The B port pipe 24B and the low pressure suction and discharge ports 53a may be connected to each other through the second power line 102.

In such a configuration, for example, when one of the right piston 70A is pushed, the pressure on the pressure source side acts on the left piston 70B to reciprocate the operating shaft 40 with double the power. Therefore, the diameters of the pistons 70A and 70B can be made small, which provides the advantage that the apparatus can be compactly configured.

In the present invention, all of the high pressure suction and discharge ports 52a and 52a 'and 52b and 52b' and the low pressure suction and discharge ports 53a and 53b and 53a 'and 53b' are provided in one plunger block 50A or 50B. Of course, it can be configured as an assembly assembled in two divisions.

In addition, the present invention may further form a spool working pressure correction pipe (1, 1 ') in the valve body 20, as shown in Figure 2 in order to correct the operating pressure of the spool 30. In addition, the duct 30 (2, 2 ') for the external valve operation may be further provided to operate the spool 30 as an external valve.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

The following drawings, which are attached in this specification, illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.

1 is an assembled cross-sectional view of a hydraulic pump having an air compression function according to an embodiment of the present invention,

Figure 2 is an enlarged view of the spool applied to the present invention in a neutral state,

3 is an operation state diagram according to the switching position of the spool in FIG.

Figure 4 and Figure 5 is an illustration of the operation state according to the switching operation of the spool as an exemplary view composed of a compressor according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1,1 ': spool working pressure compensation line

2,2 ': Pipe fitting for external valve operation

20: valve body

24A: A port pipe

24B: B port pipeline

30: Spool

40: working shaft

40a: Pilot duct for spool transfer

40b: spool tube

50A, 50B: Plunger Block

60A, 60B: Plunger

70A, 70B: piston

100: first power line

102: second power line

Claims (5)

A pressure source connection port 21, a spool operation chamber 22 in communication with the pressure source connection port 21, and piston operation chambers 23A and 23B respectively provided at both sides of the spool operation chamber 22; In the spool operation chamber 22, A and B chambers are formed on the left and right sides of the P chamber and the P chamber communicating with the pressure source connection port 21, respectively, and the A, B chamber and the piston operation chamber ( A valve body 20 including A and B port pipes 24A and 24B respectively connecting 23A and 23B; A spool (30) installed in the spool operating chamber (22) for communicating the P chamber to the A chamber or the B chamber (B) according to the switching movement position; An operating shaft 40 inserted into the spool 30 and simultaneously supported by the valve body 20 so as to be linearly movable, and having a spool conveying pilot pipe line 40a, 40a 'for switching and transferring the spool 30. and; High pressure suction and discharge ports 52a, 52a '(52b, 52b') coupled to both ends of the valve body 20, respectively, in communication with the plunger operating chambers 51a, 51b and the plunger operating chambers 51a, 51b. And a plunger block (50A, 50B) having low pressure suction and discharge ports (53a, 53a ') (53b, 53b') respectively connected to the piston operating chambers (23A, 23B); Plungers (60A, 60B) connected to both ends of the operating shaft (40) and slidably inserted into the plunger operating chambers (51a, 51b); And a piston (70A, 70B) respectively inserted into the piston operation chamber (23A, 23B) and connected to both ends of the operation shaft (40). The method of claim 1, The spool 30 further includes a pilot passage 31 for supplying the pressure oil of the P chamber to the A chamber A or the B chamber B for an initial operation. . The method of claim 1, The A port pipe line 24A and the low pressure inlet / outlet port 53b or 53b 'are connected through the first power line 100 so that the back force acts on the pistons 70A and 70B, and at the same time, the B port pipe line 24B. ) And the low pressure suction and discharge port (53a or 53a ') is connected via a second power supply line (102). The method of claim 1, The valve body 20 is a hydraulic pump having an air compression function, characterized in that the spool working pressure correction pipe (1, 1 ') is further provided. The method of claim 1, The valve body (20) is a hydraulic pump having an air compression function, characterized in that it is further provided with an external valve operation pipe connection hole (2, 2 ').

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