JP2005315230A - Manual pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manual pump reducing total inspection time of a plurality of valves, facilitating design and manufacture of a valve, replacing the plurality of valves collectively, and being miniaturized. <P>SOLUTION: Since a suction side check valve 35A, a delivery side check valve 35B and a pressure relief valve 35C are built in one valve cartridge 17, it is not necessary to perform one valve-one inspection at a time of valve inspection and inspection of all valves can be completed at one time and total inspection time can be reduced. Design and manufacturing of the valve are easy, three valve can be replaced collectively, and miniaturization can be done. Manual pumps of different sizes and types can be handled by one valve cartridge by arranging a standardized cartridge connection structure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a manual pump, and more particularly to a manual pump such as a hydraulic jack that is manually operated or stepped on.

Conventionally, as a hydraulic jack which is a kind of manual pump, for example, Patent Document 1 is known.
Patent document 1 is provided with the structure where the pump part and the jack part were standingly arranged on the base. The pump part mainly has a pump cylinder, a pump piston, and an operation lever for manually operating the pump piston. Moreover, the jack part has an oil tank, a jack cylinder defined in the center part of the oil tank, and a ram housed in the jack cylinder so as to be movable up and down.
The pump cylinder and the oil tank are communicated with each other through a suction oil passage, and the pump cylinder and the jack cylinder are communicated with each other through a discharge oil passage. The oil tank and the suction oil passage are communicated with each other by a short pressure relief oil passage. A suction-side check valve is provided in the middle of the suction oil passage, and a discharge-side check valve is provided in the middle of the discharge oil passage. The pressure relief oil passage is provided with a pressure relief valve. Each valve is mounted at a different position on the base with a different mounting structure.

When the operation lever is pulled up, the pump piston rises, and the hydraulic oil in the oil tank is drawn into the pump cylinder through the suction oil passage. At this time, backflow of the working oil to the discharge oil passage is prevented by the discharge side check valve. Next, when the operation lever is pushed down, the pump piston is lowered, the hydraulic oil in the pump cylinder is discharged to the jack cylinder through the discharge oil passage, and the ram is raised. At this time, the backflow of the hydraulic oil to the suction oil passage is prevented by the suction side check valve. Thereafter, the operation lever is continuously raised and lowered to raise the ram to a predetermined height. When returning the ram to its original height, open the pressure relief valve and open the pressure relief oil passage.
JP-A-6-286986

However, the manual pump of Patent Document 1 has the following drawbacks.
That is, (1) the discharge-side check valve, the pressure relief oil passage, and the pressure relief valve were respectively provided at different positions on the base with different mounting structures. Therefore, at the time of valve inspection after manufacturing, one valve and one inspection must be performed, and the inspection time of the valve is long.
Also, (2) different types of manual pumps must be designed and manufactured separately for the above three valves. Therefore, it took time and effort to design and manufacture the valve.
Furthermore, (3) Valves that have passed the endurance period must be replaced in a batch. At that time, each valve had to be replaced one by one, which was time consuming and increased the working time.

  The present invention provides a manual pump capable of shortening the total inspection time of a plurality of valves, facilitating the design and manufacture of the valves, exchanging a plurality of valves at once, and reducing the size. It is an object.

  The invention according to claim 1 is a pump having a liquid tank having a hydraulic fluid storage space, and a pump cylinder, a pump piston, and an operation lever capable of manually operating the pump piston provided above the liquid tank. And a valve cartridge provided with a plurality of built-in valves in a detachable manner on the pump unit, and the internal flow path has a working fluid inlet port communicating with the liquid storage space at one end. The hydraulic pump is formed with a discharge port for the hydraulic fluid that is formed at the other end and exposed to the outside of the valve cartridge, and a manual pump having a midway portion communicating with the pump cylinder.

According to the first aspect of the present invention, since a plurality of built-in valves are built in one valve cartridge, it is not necessary to perform one-valve one-inspection as in the prior art at the time of valve inspection after pump manufacture. It is possible to finish the inspection for all the valves at one time. Thereby, total valve inspection time can be shortened.
Moreover, since a plurality of built-in valves are built into one valve cartridge, the design and manufacture of the valves are easy, and these valves can be exchanged in a lump, making the manual pump compact (downsizing). Can also be planned.
For manual pumps of different sizes and types, one valve cartridge can be applied to manual pumps of different sizes and types by arranging a uniform cartridge connection structure with the same structure and size. can do.

As the hydraulic fluid, for example, water, oil, organic solution, or the like can be employed.
The material, shape, and size of the liquid tank are not limited.
The material, size, and shape of the operation lever are not limited. The manual operation includes not only an operation using a hand but also an operation using a part or all of a body such as a foot. The operation method of the operation lever may be, for example, a swing operation method or a push-pull operation method.
As the internal flow path, for example, an intake liquid path that communicates the pump cylinder and the suction port, a discharge liquid path that communicates the pump cylinder and the discharge port, and the like can be employed.
The kind of built-in valve is not limited. For example, a check valve, a switching valve, a pressure relief valve, a flow rate adjustment valve, or the like can be employed.

Examples of the material for the valve cartridge include iron and steel.
The valve cartridge may be sized to be completely stored in the liquid storage space of the liquid tank, or may be sized so that a part of the valve cartridge protrudes outside the liquid tank. Alternatively, the valve cartridge may be provided outside the liquid tank. However, the internal flow path and the liquid storage space of the liquid tank must be in communication.
The number of built-in valves in the valve cartridge is not limited as long as it is plural. For example, there may be two, three or more.

  According to a second aspect of the present invention, the internal flow path communicates the suction liquid passage that communicates the pump cylinder and the suction port, the pump cylinder and the discharge port, and the upstream portion is vertically disposed immediately below the pump cylinder. A discharge fluid passage that is connected to the upstream portion of the discharge fluid passage, and a vertical pressure relief fluid passage that draws a high-pressure working fluid from the discharge fluid passage. The built-in valve is connected to the suction fluid passage. A suction-side check valve provided; a discharge-side check valve provided in the discharge liquid path; and a pressure release valve provided in the pressure-release liquid path; and upstream of the discharge liquid path. The valve opening interlocking member that interlocks the discharge-side check valve and the pressure relief valve is housed in a relaxed manner, and the valve body of the discharge-side check valve is pushed down at the lower end of the pump piston, A member provided with a pressure relief projection for opening the pressure relief valve via a member. A manual pump according to claim 1.

According to the second aspect of the present invention, when the operation stroke of the operation lever is maximized, for example, when the pump is operated, the pressure release protrusion of the pump piston comes into contact with the valve body of the discharge side check valve, and this is pushed down. The pressure relief valve is opened through the valve opening interlocking member. As a result, the high-pressure hydraulic fluid in the discharge liquid passage is extracted through the liquid discharge passage, and the pressure of the hydraulic fluid in the discharge liquid passage decreases.
As described above, the pressure relief protrusion is provided at the lower end of the pump piston, and the pressure relief valve is also opened in conjunction with the opening operation of the discharge side check valve. Discharging and depressurization of the working fluid from the discharging fluid path can be performed.

As the pressure relief valve, for example, a check valve can be employed. In addition, a switching valve or the like can be employed.
The valve opening interlocking member is not limited as long as it is a member that can be accommodated in the upstream portion of the discharge liquid passage with room and can interlock the discharge side check valve and the pressure relief valve. For example, a pin or the like can be employed.
As the pressure release operation, when the operation stroke of the operation lever is maximized, for example, when the pump is operated, the pressure release protrusion of the pump piston comes into contact with the discharge side check valve, and the pressure release valve is operated via the valve opening interlocking member. You may make it open a valve.

According to the first aspect of the present invention, since a plurality of built-in valves are configured to be incorporated into one valve cartridge, it is not necessary to perform one-valve one-inspection as in the prior art at the time of valve inspection after pump manufacture. All the valves can be tested once. Thereby, total valve inspection time can be shortened. In addition, the design and manufacture of the valve is easy, and a plurality of valves can be exchanged in a lump, thereby achieving compactness.
For manual pumps of different sizes and types, a single cartridge cartridge can be applied even to manual pumps of different sizes and types by arranging a standardized cartridge connection structure. it can.

  In particular, according to the invention described in claim 2, the pressure relief protrusion is provided at the lower end of the pump piston, and the pressure relief valve is also opened in conjunction with the valve opening operation of the discharge side check valve. It is possible to discharge the hydraulic fluid and release the hydraulic fluid from the discharge fluid passage only by operating the operation lever.

  Examples of the present invention will be specifically described below.

  1 to 4, reference numeral 10 denotes a manual pump according to Embodiment 1 of the present invention. The manual pump 10 includes an oil tank (liquid tank) 11 in which hydraulic oil (hydraulic liquid) is stored, an oil A pump unit 15 provided at an upper portion of the tank 11 and having a pump cylinder 12, a pump piston 13 and an operation lever 14 capable of manually operating the pump piston 13, and a pump unit 15 are detachably provided, and the suction port is an oil tank. 11 is provided with a valve cartridge 17 in which a plurality of valves are disposed in an internal flow path 16 that is in communication with the liquid storage space 11 and that has a discharge port exposed to the outside and that is in communication with the pump cylinder 12.

Hereinafter, each component will be described in detail.
The oil tank 11 is a cast iron cylindrical container having an upper end opened. The pump unit 15 has a base 18 that also serves as a lid for the oil tank 11. A through hole 18 a is formed in a part of the outer peripheral portion of the base 18 through the upper and lower surfaces. An air breather 19 is detachably press-fitted into the through hole 18a.
A column 20 is erected on a part of the upper surface of the outer peripheral portion of the base 18. A base portion of the operation lever 14 is pivotally supported on the upper end portion of the support column 20 via a pin shaft 21 so as to be swingable in a vertical plane. The operation lever 14 is a member that is gradually bent downward from the vicinity of the center toward the tip, and a pedal 14a for stepping operation is integrally formed at the tip. In the vicinity of the base of the operation lever 14, an operation pin 22 with which the upper end of the pump piston 13 abuts is horizontally mounted.

  A cylindrical pump main body 23 accommodated in the liquid storage space of the oil tank 11 is formed integrally below the central portion of the base 18. A cylindrical raised portion 24 having a smaller diameter than the pump body 23 is integrally formed on the upper side of the center portion of the base 18. A pump cylinder 12 whose axis is oriented vertically is formed from the upper surface of the raised portion 24 to a substantially intermediate portion in the height direction of the pump body 23. A bush 25 is fitted on the inner peripheral surface of the pump cylinder 12 at an upper portion thereof, and an O ring 26 is provided slightly below the bush 25. The pump piston 13 is inserted into the pump cylinder 12. A washer-shaped spring holder 27 is inserted into the upper end of the pump piston 13.

Between the spring holder 27 and the formation part of the raised part 24 of the base 18, the coil spring 28 which always raises the pump piston 13 to the operation origin position is interposed. The height position of the pedal 14a when the pump piston 13 is at the origin position is defined as a reference position a (FIG. 4). Further, when the pump piston 13 pumps the hydraulic oil, the height position of the pedal 14a when the pump piston 13 is at the lowest position (not in the pressure release state) is set as the lowered position b. Furthermore, the height position of the bed when the pressure release valve described later is opened is set as a pressure release position c.
A pin-shaped pressure relief protrusion 13 a having a predetermined length is provided at the center of the lower surface of the pump piston 13.

On the lower surface of the pump body 23, a cartridge insertion hole 27 having a larger diameter than the pump cylinder 12 and a part of the inner surface (upper surface) communicating with the opening on the downstream side of the pump cylinder 12 is formed eccentrically. Yes. The valve cartridge 17 is detachably inserted into the cartridge insertion hole 27. On the inner peripheral surface of the cartridge insertion hole 27, O-rings 26 are provided around an upper end portion and an intermediate portion in the length direction. In addition, an inflow port of an outflow oil passage 50 that directly communicates with the discharge port is formed in a part of the upper portion of the inner peripheral surface of the cartridge insertion hole 27. The spilled oil passage 50 is a flow passage formed in a range from an intermediate portion in the length direction of the pump body 23 to an intermediate portion in the thickness direction of the base 18. The outlet of the spilled oil passage 50 is formed on a part of the outer peripheral surface of the base 18. The outflow port is communicated with the jack cylinder 31 of the jack portion 30 separated from the manual pump 10 via the external hose 29. When hydraulic oil is press-fitted into the jack cylinder 31, the ram 32 rises and the work W, which is a heavy object, is pushed up.
In addition, an outlet of the inflow oil passage 33 that is directly communicated with the suction port is formed in a part of the lower portion of the inner peripheral surface of the cartridge insertion hole 27. The inflow oil passage 33 is formed at the lower end of the pump body 23. The inlet of the inflow oil passage 33 is in communication with the lower part of the liquid storage space of the oil tank 11.

Hereinafter, the valve cartridge 17 will be described in detail.
The valve cartridge 17 has a cylindrical cartridge body 34. A flange is formed at the lower end of the cartridge body 34. The valve cartridge 17 inserted into the cartridge insertion hole 27 is bolted to the pump body 23 via the flange. At this time, a slight gap is formed between the upper surface of the valve cartridge 17 and the inner surface of the cartridge insertion hole 27. This gap serves as a passage for supplying hydraulic oil in the oil tank 11 to the pump cylinder 12 through a suction oil passage (described later).
The cartridge body 34 is formed with the internal flow path 16 for supplying the hydraulic oil in the oil tank 11 to the external hose 29. The suction port of the internal flow path 16 communicates with the liquid storage space of the oil tank 11 via the inflow oil path 33. Further, the discharge port of the internal flow path 16 communicates with the external hose 29 via the spilled oil path 50. Three valves, which will be described later, are disposed in the internal flow path 16.

The internal flow path 16 will be described in more detail. The internal flow path 16 communicates the suction oil path (suction liquid path) 16 </ b> A that communicates the pump cylinder 12 and the suction port with the pump cylinder 12 and the discharge port, and the upstream portion is vertically disposed immediately below the pump cylinder 12. It has an oil passage (discharge fluid passage) 16B and a vertical pressure relief fluid passage (pressure relief fluid passage) 16C that communicates with the upstream portion of the discharge oil passage 16B and draws high-pressure hydraulic fluid from the discharge oil passage 16B. Yes.
The suction oil passage 16 </ b> A is a flow passage parallel to the axis of the cartridge main body 34, and only the upstream portion thereof is bent in the radial direction of the cartridge main body 34 and communicates with the inflow oil passage 33. The downstream opening of the suction oil passage 16 </ b> A communicates with a gap formed between the upper surface of the valve cartridge 17 and the inner surface of the cartridge insertion hole 27.

The discharge oil passage 16B is a transverse T-shaped passage. A short pin-shaped valve opening interlocking member 38 that interlocks the discharge-side check valve 36 and the pressure release valve 37 is accommodated in the upstream portion of the discharge oil passage 16B in a state where the discharge side check valve 36 and the pressure release valve 37 are inserted with a clearance in the coil spring 35B. Has been.
An oil drain plug 39 having an orifice is screwed to the downstream portion (lower end portion) of the pressure release oil passage 16C via an O-ring 26.

  The three valves are a suction-side check valve (built-in valve) 40 provided in the downstream portion (upper end portion) of the intake oil passage 16A and a discharge portion provided in the upstream portion (upper end portion) of the discharge oil passage 16B. A side check valve (built-in valve) 36 and a pressure relief valve (built-in valve) 37 provided in the upstream portion (upper end portion) of the pressure relief oil passage 16C. The pressure relief valve 37 also has a check valve structure. The pressure relief valve 37 also operates as a safety valve for the hydraulic oil discharge circuit (oil passage). Each valve has steel balls 41 </ b> A to 41 </ b> C and coil springs 35 </ b> A to 35 </ b> C that elastically press the steel balls against corresponding opening / closing ports. Among these, the steel ball (valve element) 41C for the pressure relief valve 37 has a larger diameter than the other two, and is elastically supported by the coil spring 35 via the ball receiver 42. Further, the coil spring 35 for the pressure relief valve 37 has a larger diameter than the other two and has a larger spring force. That is, a large operating force is required for the operating lever 14 when the large diameter steel ball 41 </ b> C is pressed down by the pressure-release protrusion 13 a to depress against the spring force of the large-diameter coil spring 35.

Next, the operation of the manual pump 10 according to the first embodiment will be described.
As shown in FIGS. 1 to 4, when the pedal 14 a is depressed during pump operation, the depression force is transmitted to the pump piston 13 via the operation pin 22. As a result, the operating lever 14 pivots downward in the vertical plane around the pin shaft 21 against the spring force of the coil spring 28 (the bedal is lowered from the reference position a to the lowered position b). At the same time, the pump piston 13 is pushed down, and the pressure of the hydraulic oil in the pump cylinder 12 is increased. At this time, the flow (reverse flow) of the hydraulic oil into the suction oil passage 16A is blocked by the suction-side check valve 40.
When the pressure of the hydraulic oil in the pump cylinder 12 is increased, the steel ball 41B is lowered against the spring force of the coil spring 35B, and the discharge side check valve 36 is opened. Thus, the hydraulic oil flows into the discharge oil passage 16B. Thereafter, the hydraulic oil is pressed into the jack cylinder 31 from the discharge port of the discharge oil passage 16 </ b> B through the outflow oil passage 50 and the external hose 29. As a result, the ram 32 rises and pushes up the workpiece W.

When the pedal force of the pedal 14a is weakened, the pump piston 13 is raised by the spring force of the coil spring 28, and at the same time, the operation lever 14 is rotated to the origin position (the pedal 14a is raised from the lowered position b to the reference position a). As a result, the pressure in the pump cylinder 12 becomes negative. As a result, the suction side check valve 40 opens against the spring force of the coil spring 35A, and the hydraulic oil in the oil tank 11 flows into the suction oil passage 16A from the inflow oil passage 33 and the suction port, and then the suction side check valve. It passes through a gap formed between the upper surface of the valve 40 and the valve cartridge 17 and the inner surface of the cartridge insertion hole 27 and is supplied into the pump cylinder 12. At this time, the discharge-side check valve 36 prevents the backflow of hydraulic oil to the discharge oil passage 16B.
Thereafter, by repeatedly depressing the pedal 14a, the ram 32 of the jack portion 30 is raised, and the workpiece W is pushed up to a predetermined height.
When returning the workpiece W to the original height, the pedal 14a is pushed down to the pressure release position c against the spring force of the coil spring 28 and the coil spring 35. During this depression, the pressure release protrusion 13a of the pump piston 13 pushes down the iron ball 41B of the discharge side check valve 36, and thereby the iron ball 41C is resisted against the spring force of the coil spring 35C via the valve opening interlocking member 38. Is pushed down. In this way, the pressure release valve 37 is opened, and the high pressure hydraulic oil passes through the orifice of the oil release plug 39 from the pressure release oil passage 16 </ b> C and is returned to the liquid storage space of the oil tank 11.

As described above, since the three built-in valves 36, 37, and 40 are incorporated in one valve cartridge 17, it is not necessary to perform one-valve one-inspection as in the prior art at the time of valve inspection after pump manufacture. This makes it possible to complete the inspection for one valve at a time. Thereby, total valve inspection time can be shortened.
Moreover, since the three valves 36, 37, and 40 are incorporated into the single valve cartridge 17, the design and manufacture of the valve is easy, and the three valves 36, 37, and 40 can be exchanged collectively. The valve structure, and thus the manual pump 10 can be made compact.
Also, for manual pumps of different sizes and types, the same structure and the same size cartridge connection structure are arranged, so that one valve cartridge 17 can be changed to a manual pump of different sizes and types. Can be applied.
Further, since the pressure relief protrusion 13a is provided at the lower end of the pump piston 13 and the pressure relief valve 37 is also opened in conjunction with the valve opening operation of the discharge side check valve 36, the operation lever 14 can be operated only. It is possible to discharge the hydraulic fluid and release the hydraulic fluid from the discharge fluid passage.

1 is a front view including a partial cross-sectional view of a manual pump according to Embodiment 1 of the present invention. It is a principal part expanded sectional view of the manual pump which concerns on Example 1 of this invention. It is a top view of the manual pump concerning Example 1 of this invention. It is a front view which shows the use condition of the operating lever of the manual pump which concerns on Example 1 of this invention.

Explanation of symbols

10 Manual pump,
11 Liquid tank,
12 Pump cylinder,
13 Pump piston,
13a Pressure release protrusion,
14 Operation lever,
15 Pump part,
16 Internal flow path,
16A Inhalation oil passage (inhalation fluid passage),
16B Discharge oil passage (discharge fluid passage),
16C pressure relief oil passage (pressure relief fluid passage),
17 valve cartridge,
35A suction side check valve (built-in valve),
35B Discharge check valve (built-in valve),
35C pressure relief valve (built-in valve),
38 Valve opening interlocking member.

Claims (2)

A liquid tank having a hydraulic fluid storage space;
A pump unit provided at an upper portion of the liquid tank and having a pump cylinder, a pump piston, and an operation lever capable of manually operating the pump piston;
A valve cartridge that is detachably provided in the pump unit and in which a plurality of built-in valves are disposed,
The internal flow path has one end formed with a working fluid suction port communicating with the liquid storage space, the other end formed with a working fluid discharge port exposed to the outside of the valve cartridge, and a halfway portion. A manual pump in communication with the pump cylinder. The internal flow path includes a suction liquid path that communicates the pump cylinder and the suction port, a discharge liquid path that communicates the pump cylinder and the discharge port, and an upstream portion is vertically disposed immediately below the pump cylinder, and the discharge A vertical depressurization fluid path that communicates with the upstream portion of the fluid path and draws a high-pressure working fluid from the discharge liquid path;
The built-in valve has a suction side check valve provided in the suction liquid passage, a discharge side check valve provided in the discharge fluid passage, and a pressure release valve provided in the pressure release fluid passage. And
A valve opening interlocking member that interlocks the discharge-side check valve and the pressure relief valve is accommodated in the upstream portion of the discharge liquid passage with a clearance.
The pressure lowering protrusion which presses down the valve body of the said discharge side non-return valve, and opens the said pressure relief valve via the said valve opening interlocking | linkage member was provided in the lower end of the said pump piston. Manual pump.

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