CN217603433U - Hand pump with pilot pressure limiting valve - Google Patents

Abstract

The utility model discloses a hand pump of guide's formula pressure limiting valve comprises rocking arm subassembly 1, pump body subassembly 2, oil-out 3, oil inlet 4, safety valve casing 5, safety valve casing O type circle 6, pilot valve core 7, main valve core 8, main valve spring 9, disk seat 10, disk seat O type circle 11, pressure limiting valve sealing washer 12, swivel nut 13, guide's spring holder sealing washer 14, guide's spring 15, elasticity adjustment pad 16, spring holder 17 and damping hole, draining hole, pressure release hole. The utility model discloses in using hand pump product with guide's formula pressure valve principle, integrated guide's formula pressure limiting valve in the inside business turn over oil circuit of hand pump, it is low to have solved current pressure limiting valve and lean on single opening compression spring to open the pressure control precision that the pressure release caused, and the pressure oscillation is big, high-pressure output oil mass loss shortcoming such as big.

Description

Hand pump with pilot pressure limiting valve

Technical Field

The utility model belongs to the technical field of hydraulic pressure hand pump, specifically speaking is a hand pump of guide's formula pressure limiting valve.

Background

The hand pump has pressure limiting function, and is developed and applied in hand pumps in recent years, the adopted pressure limiting valve principle is mainly a plunger type or steel ball type spring structure, and the hand pump has low pressure control precision, large pressure fluctuation and large high-pressure output oil loss.

Disclosure of Invention

An object of the utility model is to provide a hand pump of guide's formula pressure limiting valve.

Realize the utility model discloses the technical solution of purpose does: a pilot-operated type pressure limiting valve hand pump comprises a rocker arm assembly, a pump body assembly, an oil outlet, an oil inlet, a safety valve shell O-shaped ring, a pilot valve core, a main valve spring, a valve seat O-shaped ring, a pressure limiting valve sealing ring, a threaded sleeve, a pilot spring, an elastic force adjusting pad, a spring seat, a damping hole, an oil drainage hole and a pressure relief hole;

the high pressure area P in the pump body is communicated with the oil outlet, the low pressure area K is communicated with the oil inlet, after the safety valve shell is screwed into the pump body through threads, the outside of the safety valve shell is divided into 2 high and low pressure cavities through a safety valve shell O-shaped ring and a pressure limiting valve sealing ring, 2 pressure relief holes of 30 degrees are formed in the safety valve shell, a main valve core and a valve seat are arranged in an inner hole of the safety valve shell and can slide in a hole of the safety valve shell, 2O-shaped sealing rings are arranged on the main valve core and the valve seat, the valve seat is pressed on a step at the lower end of an inner cavity of the safety valve shell through a threaded sleeve, a main valve spring is arranged between the valve seat and the main valve core and has a certain gap, a damping hole is formed in the inner hole of the main valve core, a conical surface of the main valve core is tightly attached to the edge of an upper end hole of the main valve of the inner cavity of the safety valve shell under the action of a spring force, the pressure oil in the high pressure cavity P cannot enter the low pressure cavity K through an oil drainage hole through the conical surface of the main valve core, the threaded sleeve, the valve core and the main valve seat and the main valve core are respectively inserted from the lower part of the safety valve shell, under the action of the spring seat, the conical surface of the pilot valve core tightly attached to the pilot valve core, and the pilot spring seat can adjust the elasticity of the pilot spring. The device also comprises a pilot spring seat sealing ring arranged on the spring seat.

Compared with the prior art, the utility model, it is showing the advantage: the utility model discloses in using hand pump product with guide's formula pressure valve principle, the guide's formula pressure limiting valve has been integrated in the inside business turn over oil circuit of hand pump, when guide's formula pressure limiting valve pressure reached the specified value pressure release, 2 pressure release mouths can be opened rapidly, make the superpressure obtain the release immediately, it is low to solve current pressure limiting valve and lean on single opening compression spring to open the pressure control precision that the pressure release caused, the pressure fluctuation is big, high-pressure output oil mass loss shortcoming such as big, especially, the high-pressure pump, its advantage is showing very much.

Drawings

Fig. 1 (a) is a schematic view of a pilot pressure limiting valve applied to a certain hand pump, fig. 1 (b) is a schematic view of a pilot pressure limiting valve applied to a certain hand pump, fig. 1 (c) is a schematic view of a pilot pressure limiting valve applied to a certain hand pump, fig. 1 (d) is a schematic view of a pilot pressure limiting valve applied to a certain hand pump, and fig. 1 (e) is a schematic view of a pilot pressure limiting valve applied to a certain hand pump.

Fig. 2 (a) is a C-C view showing the integration of the oil passage of the inlet and outlet inside the hand pump and the pilot valve, and fig. 2 (B) is a B-B view showing the integration of the oil passage of the inlet and outlet inside the hand pump and the pilot valve.

Fig. 3 is a schematic structural view of a hand pump with a pilot pressure limiting valve.

Detailed Description

The utility model discloses technical scheme is shown in figure 1, and it is by rocking arm subassembly 1, pump body subassembly 2, oil-out 3, oil inlet 4, relief valve casing 5, relief valve casing O type circle 6, pilot valve core 7, main valve core 8, main valve spring 9, disk seat 10, disk seat O type circle 11, pressure limiting valve sealing washer 12, swivel nut 13, pilot spring seat sealing washer 14, pilot spring 15, elasticity adjustment pad 16, spring holder 17 and damping hole, draining hole, pressure release hole etc. constitute.

When high-pressure oil (arrow direction in A-A view) from the oil outlet enters the main valve core through the damping hole, before the pilot valve core is not opened (the pressure of the oil outlet does not reach the specified pressure limiting pressure), because the pressure difference exists at the two ends of the main valve core and the action of the main valve spring is added, the conical surface of the main valve core is tightly pressed at the edge of the stepped hole of the valve body, the high-pressure oil can not be discharged from the oil discharge hole and can only be discharged from the high-pressure oil outlet; when the pressure of the oil outlet reaches the specified pressure limiting pressure (greater than the elastic force of the pilot spring), the pilot valve core is jacked open, the interior of the main valve core is communicated with the oil tank, the pressure is converged and reduced to 0, the original back pressure sealing formed by the pressure difference of the main valve core is reversed instantly, the conical surface of the main valve core is opened instantly under the action of the high pressure of the oil inlet, most high-pressure oil is discharged from the oil drainage port instantly, and the phenomenon that the pressure is reduced after being continuously increased, but is reduced synchronously and rapidly with the opening of the pilot valve is avoided.

The details and operation of the present invention will be further described with reference to the drawings and examples.

The utility model discloses technical scheme is as shown in the figure, it is by rocking arm subassembly 1, pump body subassembly 2, oil-out 3, oil inlet 4, safety valve casing 5, safety valve casing O type circle 6, pilot valve core 7, main valve core 8, main valve spring 9, disk seat 10, disk seat O type circle 11, pressure limiting valve sealing washer 12, swivel nut 13, pilot spring seat sealing washer 14, pilot spring 15, elasticity adjustment pad 16, spring holder 17 and damping hole, draining hole, pressure release hole etc. constitute.

The high pressure area P in the pump body communicates with oil outlet, the low pressure area K communicates with oil inlet, after the safety valve shell 5 is screwed into the pump body through the whorl, the outside of the safety valve shell is divided into 2 high-pressure and low-pressure cavities through the sealing element 6 and 12, there are 2 pressure relief holes of 30 degrees on it, the inner bore of the safety valve shell is equipped with the main valve core 8 and valve base 10, both can slip in the hole of the safety valve shell, in order to prevent the slip surface from leaking, equipped with 2O-type seal rings 11 on main valve core 8 and valve base 10, the valve base 10 presses on the step of the bottom end of the inner cavity of the safety valve shell 5 through the swivel nut 13, equipped with the main valve spring 9 between valve base 10 and the main valve core 8, and there is certain interval, the inner bore of the main valve core 8 has damping holes, its conical surface is closely attached to the edge of step of the upper end of inner cavity of the safety valve shell 5 under the spring force of the main valve, the high pressure cavity P pressure oil can's through the main valve core 8 via the oil drainage hole to enter the low-pressure cavity K, the pilot valve core 7 is inserted from the swivel nut 13, valve base 10, valve core 7, the pilot valve core 5 from the swivel nut, the spring base 17, the pilot valve base 10, the pilot valve core 7 is closely attached to the spring base 17, under the action of the spring 15, the pilot spring base 15, can open the pilot valve base 15 first small pilot valve core 16 of pilot spring can adjust the pilot valve core.

When high-pressure oil P (figure 3) from an oil outlet enters a joint part of the main valve core 8 and the valve seat 10 through a damping hole, before the pressure of the pilot valve core does not reach a specified value (the pressure of the oil outlet does not reach a specified pressure limiting pressure), because the pressure difference exists at two ends of the main valve core 8 and the action of a main valve spring is added, the conical surface of the main valve core 8 is tightly pressed on the edge of a step hole of a safety valve shell 5, high-pressure oil in a high-pressure cavity cannot enter a low-pressure cavity from an oil drainage hole to be discharged, and only the high-pressure oil is discharged from an oil outlet of a hand pump, namely the hand pump outputs the pressure oil to the outside; when the pressure of the oil outlet reaches the specified pressure limiting pressure (larger than the elastic force of a pilot spring), the pilot valve core 7 is jacked open, the joint of the main valve core 8 and the valve seat 10 is communicated with the low-pressure cavity K through 2 pressure relief holes at the moment, the pressure is converged and reduced, the original back pressure sealing formed by the pressure difference of the main valve core 8 is reversed at the moment, the conical surface of the main valve core 8 is opened at the moment under the action of the high pressure P of the oil inlet, most high-pressure oil is discharged from the oil drainage port at the moment, the pressure is prevented from being reduced after continuously rising, and the pressure and the pilot valve 7 are opened and synchronously and rapidly reduced.

The utility model discloses obtain application and actual test in the hand pump of newly-researched. The oil outlet has stable load pressure limiting value and output flow, small pressure fluctuation, small influence on the speed of rocking along with people and satisfactory performance index, and the pressure limiting valve is opened and closed within a specified pressure range.

Claims (2)

1. A hand pump of pilot-operated pressure limiting valve, its characterized in that: the oil-saving control valve comprises a rocker arm component (1), a pump body component (2), an oil outlet (3), an oil inlet (4), a safety valve shell (5), a safety valve shell O-shaped ring (6), a pilot valve core (7), a main valve core (8), a main valve spring (9), a valve seat (10), a valve seat O-shaped ring (11), a pressure limiting valve sealing ring (12), a threaded sleeve (13), a pilot spring (15), an elastic force adjusting pad (16), a spring seat (17), a damping hole, an oil drainage hole and a pressure relief hole;

the high pressure area P in the pump body is communicated with an oil outlet (3), the low pressure area K is communicated with an oil inlet (4), a safety valve shell (5) is screwed into the pump body through threads, the outside of the safety valve shell (5) is divided into 2 high-pressure cavities and 2 low-pressure cavities through a safety valve shell O-shaped ring (6) and a pressure limiting valve sealing ring (12), 2 pressure relief holes with 30 degrees are opened on the safety valve shell, a main valve core (8) and a valve seat (10) are arranged in an inner hole of the safety valve shell (5) and can slide in the inner hole of the safety valve shell (5), 2 valve seat O-shaped rings (11) are arranged on the main valve core (8) and the valve seat (10), the valve seat (10) is pressed on the lower end step of the inner cavity of the safety valve shell (5) through a screw sleeve (13), a main valve spring (9) is arranged between the valve seat (10) and the main valve core (8) and has a certain clearance, a damping hole is opened on the main valve core (8), the conical surface of the main valve core is tightly attached to the upper end edge of the inner cavity of the safety valve shell (5) under the action of the main valve shell (5) through a conical surface under the spring force, the pressure oil pressure of the high pressure area P clings to the low pressure area (7) through the conical surface, the conical surface of the main valve core (8), the safety valve seat (7) and the pressure area (7) respectively under the pressure area (17) under the action of the pilot valve seat (7), the pilot valve seat (17) and the pilot valve core (10), the pilot valve seat (17) are inserted into the pilot valve seat (10), the opening of the pilot valve core (7) can be adjusted by the elastic force of the pilot spring (15) through an elastic force adjusting pad (16).

2. The hand pump of a piloted pressure limiting valve as in claim 1, characterized in that: the device also comprises a pilot spring seat sealing ring (14) arranged on the spring seat (17).

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