CN201053562Y

CN201053562Y - Pressure relief type lubricating pump pressure-reliving valve

Info

Publication number: CN201053562Y
Application number: CNU2007200891567U
Authority: CN
Inventors: 赵民章
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-01-11
Filing date: 2007-01-11
Publication date: 2008-04-30
Anticipated expiration: 2017-01-11

Abstract

A pressure relief valve for pressure relief type lubricating pump mainly comprises a slide valve body, a slide valve core, a return spring and a valve seat, wherein, a blind hole at the lower end of the slide valve core is welded with a filter screen; the lower part of a shaft shoulder of the slide valve core is provided with oppositely penetrating throttle holes communicated with the blind hole in radial direction; the lower end of the shaft shoulder is covered by a damping gasket and then put into the slide valve body to correspond to an oil outlet of a pump; an axial elastic sealing block is fixed in the blind hole at the upper end of the slide valve core; the return spring is arranged between the slide valve core and the valve seat; an unloading hole is axially arranged on the valve seat; a set gap is arranged between the elastic sealing block and the unloading hole of the valve seat when a lubricating pump is not in working state. As the elastic sealing block is fixed with the slide valve core and the slide valve is accurate in reciprocating motion, accurate centring accuracy between the elastic sealing block and the unloading hole of the valve seat is ensured, which ensures that an unloading valve can be tight in sealing when the lubricating pump operates and steady as well as complete in unloading when the lubricating pump stops operating.

Description

Unloading type lubricant pump pressure-relief valve

(1) technical field

The utility model relates to lubrication technical field, relates in particular to a kind of unloading type lubricant pump pressure-relief valve.

(2) background technique

In the employed in the market lubrication technology, the most frequently used is a kind of unloading type lubricant pump structure, after this structural requirement lubricant pump quits work, and the necessary release of working connection, the oil separator of working connection end could be to each lubricating point fuel feeding.Therefore, in this structure, need a pressure-relief valve be set pumping hydraulic fluid port, common pressure-relief valve sees German VOGELKFU2-40 type commerial vehicle one-shot chassis lubrication system and the patent No. is the utility model patent " the automatic control balanced relief valve of lubrication system " of ZL00247891.9 on the market, mainly is made up of slide valve, two-position three way sliding spool, dual spring cone valve and conical valve base etc.The pressure-relief valve of this structural type has solved a working connection release difficult problem, but its spring supporting structure makes cone valve to-and-fro motion precision relatively poor, usually with conical valve base on unloading hole poorly sealed, cause that fluid seriously leaks in the lubricant pump running, cause the lubricant pump can't be to the main oil gallery delivering oil.The utility model patent that the then disclosed patent No. is ZL00248280.0 " a kind of automatic control balanced relief valve " has been simplified to the umbrella shape elastic packing bowl formula structure that spring support moves back and forth down to two-position three way guiding valve and dual spring cone valve, though this structure is simple, but its spring supporting structure makes umbrella shape bowl to-and-fro motion precision still relatively poor, still can't guarantee the reliably working of lubrication system.

(3) summary of the invention

The purpose of this utility model is fundamentally thoroughly to improve said structure, and unloading valve can be worked reliably.

The technical solution of the utility model is as follows: a kind of unloading type lubricant pump pressure-relief valve, mainly by slide valve, sliding spool, return spring and valve seat are formed, sliding spool lower end blind hole mouth welds a filter screen, the sliding spool bottom radially is provided with and communicates with this blind hole to wearing throttle orifice, its shaft shoulder lower end puts in the slide valve of packing into behind the damping washer, the respective pump oil outlet, at sliding spool upper end blind hole internal fixation one axial elasticity sealing block, sliding spool and valve base chamber reinstall a spring, one unloading hole is axially arranged on valve seat, under the lubricant pump off position, have one to set the gap between elastic packing piece and valve seat unloading hole.

Working principle of the present utility model is: when lubricant pump running pump oil, fluid flows through the filter screen of sliding spool lower end blind hole mouth, the pressure that produces promotes to move and pressure spring on the sliding spool, at first make gap disappearance and sealing unloading hole between elastic packing piece and valve seat unloading hole, under the oil pressure effect, on the sliding spool when wearing throttle orifice and expose slide valve, elastic packing piece and the sealing of valve seat unloading hole are tight, fluid passes throttle orifice and flows to main oil gallery, makes the main oil gallery build-up pressure.When lubricant pump shut down, oil pressure reduced rapidly between lubricant pump and guiding valve, and under return spring and the effect of main oil gallery oil pressure, sliding spool moves down and resets, and the valve seat unloading hole is opened, and main oil gallery fluid flows back to fuel tank from unloading hole, and the main oil gallery oil pressure reduces.Damping washer moves down the impact that alleviates the guiding valve shaft shoulder and slide valve when resetting at sliding spool, and the filter screen of sliding spool lower end blind hole mouth can prevent that throttle orifice from being stopped up by dirt.

Because elastic packing piece and sliding spool are together fixedly connected, and the sliding spool to-and-fro motion is accurate, thereby guaranteed accurate accuracy of alignment between elastic packing piece and valve seat unloading hole, and unloading valve can when turning round, lubricant pump be sealed tightly, and off-load is steadily, thoroughly when shutting down.

(4) description of drawings

The utility model is described in further detail below by accompanying drawing.

Accompanying drawing 1 is the structural representation of the utility model in the lubricant pump working state.

Accompanying drawing 2 is structural representations of the utility model depressurization phase after lubricant pump quits work.

1. slide valves among the figure, 2. sliding spool, 3. return spring, 4. valve seat, 5. filter screen 6. pair is worn throttle orifice, 7. sealing block, 8. damping washer, 9. oil outlet, 10. pressure relief vent, 11. fuel tanks, 12. main oil gallerys.

(5) embodiment

Shown in the accompanying drawing, pressure-relief valve mainly is made up of slide valve 1, sliding spool 2, return spring 3 and valve seat 4, sliding spool 2 lower end blind hole mouths weld a filter screen 5, sliding spool 2 shaft shoulder bottoms radially are provided with and communicate with this blind hole to wearing throttle orifice 6, its shaft shoulder lower end puts in the slide valve 1 of packing into behind the damping washer 8, respective pump oil outlet 9, sliding spool 2 upper end blind hole internal fixation one axial

elasticity sealing block

7,4 of sliding spool 2 and valve seats reinstall a spring 3, and a unloading hole 10 is axially arranged on the valve seat 4.Under the lubricant pump off position, 10 of the unloading holes of elastic packing piece 7 and valve seat 4 have one to set the gap.11 is fuel tank, 12 logical main oil gallerys.

Claims

1. unloading type lubricant pump pressure-relief valve, mainly by slide valve (1), sliding spool (2), return spring (3) and valve seat (4) are formed, it is characterized in that: radially be provided with wearing throttle orifice (6) in sliding spool (2) shaft shoulder bottom, communicate with sliding spool (2) lower end blind hole, sliding spool (2) shaft shoulder lower end puts damping washer (8) rear and lower end and packs in the slide valve (1), respective pump oil outlet (9), at sliding spool (2) upper end blind hole internal fixation one axial elasticity sealing block (7), reinstall a spring (3) between sliding spool (2) and valve seat (4), a unloading hole (10) is axially arranged on the valve seat (4).

2. unloading type lubricant pump pressure-relief valve according to claim 1 is characterized in that: sliding spool (2) lower end blind hole mouth welds a filter screen (5).