CN2457418Y

CN2457418Y - Tracing valve

Info

Publication number: CN2457418Y
Application number: CN 00265425
Authority: CN
Inventors: 吴建明; 王黎明
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-12-23
Filing date: 2000-12-23
Publication date: 2001-10-31
Anticipated expiration: 2010-12-23

Abstract

The utility model discloses a tracing valve which is used for tracing pressure in a pot 14. A valve body forms a cylinder 4 inside. A valve core 2 is movably arranged in the cylinder 4 and a sealing member 5 is arranged between the upper end of the valve core 2 and the cylinder 4. A valve seat 3 is arranged on the lower end of the cylinder 4, and a sealing ring 7 is arranged between the valve seat and the cylinder 4. The valve seat 3 is provided with a pore 9 which can be sealed by the valve core 2. The upper part of the valve body 1 is provided with a pore 10, and the lower part of the valve body 1 is provided with a pore 11. The sealing member is arranged between the pore 10 and the pore 11. Therefore, the utility model can automatically regulate oil pressure in a seal cavity 13 according to the pressure in the pot 14.

Description

Follow-up type valve

The utility model relates to a kind of device of following the tracks of the still internal pressure.

Still is all taked the level pressure circulation with sealing circulation fuel feeding at present, but the still internal pressure is not a definite value, so charge oil pressure will change with the still internal pressure, like this, just can receive effect energy-saving and cost-reducing, life-saving.When charge oil pressure was higher, what have taked classification level pressure fuel feeding operation, this except bring economic benefit not high, main is troublesome poeration, also may be accidents caused because of misoperation.

The purpose of this utility model is to provide a kind of can make the follow-up type valve that oil pressure changes automatically in the Seal cage according to still internal pressure situation at any time under volume type pump fuel feeding situation.

In order to address the above problem, the technical solution of the utility model is: mainly be made up of valve body, spool and valve seat, form a cylinder body in the valve body, valve seat places the lower end of cylinder body, be provided with seal ring between valve seat and cylinder body, be provided with a pore C in the valve seat, pore C is as oil outlet, again, valve body top is provided with a pore A, communicate in pore A and the still, valve body lower portion is provided with a pore B, and pore B is as filler opening, spool is movably placed in the cylinder body, spool can be sealed pore C, is provided with Sealing between spool and cylinder body, and set Sealing is between pore A and B between spool and cylinder body.

Further technological scheme of the present utility model is: a quarter butt is formed at the spool bottom, and valve seat pore C port just can be sealed in the quarter butt top, and the quarter butt top is taper, and pore C opening is tubaeform, is complementary with the quarter butt end shape; Again, be provided with a spring, spring one end is against the cylinder body top, and the other end is against the spool upper end, and set Sealing is the O RunddichtringO between spool and cylinder body.

Good effect of the present utility model has: owing to adopt the volume type pump fuel feeding, be that charge oil pressure can be infinitely great, again spool cylinder body be divided into not connected on, following two parts, the cylinder interior pressure and the still internal pressure of spool top equate, because oil pressure can be infinitely great, therefore always the power of the interior oil pressure formation of spool below cylinder body at a time is greater than the power that spool top cylinder interior pressure forms, at this moment, move on the spool, pore C opens, oil flows out from pore C, get back to fuel tank, on the spool, downforce keeps transient equiliblium, promptly, spool below pressure (oil pressure) becomes with top pressure (still pressure), so the utility model can be regulated oil pressure in the Seal cage at any time automatically according to the still internal pressure.

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is use principle figure of the present utility model.

Embodiment: referring to Fig. 1 and Fig. 2, a kind of follow-up type valve, mainly form by valve body 1, spool 2 and valve seat 3, form a cylinder body 4 in the valve body 1, spool 2 is movably placed in the cylinder body 4, and spool 2 is a piston in fact, and 4 of spool 2 and cylinder bodies are provided with Sealing 5, Sealing 5 is the O RunddichtringO, and Sealing 5 can guarantee that the space is not connected in the upper and lower cylinder body of spool 4; Again, be provided with a spring 6, spring 6 one ends are against cylinder body 4 tops, and the other end is against spool 2 upper ends, again, spring 6 maintains certain elastic force, so spool 2 always has the trend that presses down, and promptly the utility model has an initial pressure (as not establishing spring 6, then initial pressure is a frictional force, can ignore), this initial pressure and still 14 internal pressures do not have coherence, and valve seat 3 places the lower end of cylinder body 4,4 of valve seat 3 and cylinder bodies are provided with seal ring 7, one quarter butt 8 is formed at spool 2 bottoms, and quarter butt 8 tops are taper, is provided with a pore 9 in the valve seat 3, pore 9 openings are tubaeform, be complementary with quarter butt 8 end shapes, pore 9 ports just can be sealed in quarter butt 8 tops, again, valve body 1 top is provided with a pore 10, pore 10 and 14 interior connections of still, promptly the cylinder body 4 space internal pressures of spool 2 tops and still 14 internal pressures equate, valve body 1 bottom is provided with a pore 11, pore 11 is as filler opening, be used for volume type pump 12 to it for quantitative oil, so oil pressure can be infinitely great, Sealing 5 is in pore 10 and 11.

Using process of the present utility model is: the oil of volume type pump 12 outputs enters the utility model below through Seal cage 13 (Seal cage 13 is connected in still 14) by pore 11, and its pressure P is shown that by the controlled pressure table real is Seal cage 13 internal pressures; Still 14 internal pressure gases (or other media) enter the utility model top, its pressure P by the mouth of pipe 10.Show by the command pressure table.During work, have certain pressure in the still 14, spool 2 is subjected to the effect of spring 6 and pressure medium to produce down pressure, and the utility model is closed.Oil pressure can infinitely raise in the spool 2 below cylinder bodies 4, therefore the power that always at a time oil pressure form in the spool 2 below cylinder bodies 4 will surpass the suffered power in spool 2 tops, at this moment, move on the spool 2, quarter butt 8 cone-shaped ends are removed pore 9, and pore 9 openings can be opened, oil flow back into the (oil that flows out in the fuel tank 15 from pore 9 from pore 9, oil pressure can think zero), at this moment, the power that spool 2 upper and lowers are subjected to is in transient equiliblium.Therefore spool 2 below pressure P (being oil pressure) are with the top pressure P.(being still 14 internal pressures) and become, thereby the utility model can be regulated oil pressure in the Seal cage 13 at any time automatically according to still 14 internal pressures.

Claims

1. follow-up type valve, mainly by valve body (1), spool (2) and valve seat (3) are formed, formation-cylinder body (4) in the valve body (1), valve seat (3) places the lower end of cylinder body (4), be provided with seal ring (7) between valve seat (3) and cylinder body (4), be provided with a pore (9) in the valve seat (3), valve body (1) bottom is provided with a pore (11), valve body (1) top is provided with a pore (10), it is characterized in that: spool (2) is movably placed in the cylinder body (4), spool (2) can be sealed pore (9) opening, is provided with Sealing (5) between spool (2) and cylinder body (4), and Sealing (5) is between pore (10) and pore (11).

2. follow-up type valve according to claim 1 is characterized in that: a quarter butt (8) is formed at spool (2) bottom, and pore (9) port just can be sealed in quarter butt (8) top.

3. follow-up type valve according to claim 1 and 2 is characterized in that: quarter butt (8) top is taper, and pore (9) opening is tubaeform, is complementary with quarter butt (8) end shape.

4. follow-up type valve according to claim 1 and 2 is characterized in that: can be provided with a spring (6), spring (6) one ends are against cylinder body (4) top, and the other end is against spool (2) upper end.

5. follow-up type valve according to claim 1 is characterized in that: Sealing (5) is the O RunddichtringO.