CN109268546A

CN109268546A - Overflow system

Info

Publication number: CN109268546A
Application number: CN201811181877.XA
Authority: CN
Inventors: 朱蔚
Original assignee: NINGBO HUAXUN CLEANING MACHINERY CO Ltd
Current assignee: NINGBO HUAXUN CLEANING MACHINERY CO Ltd
Priority date: 2018-10-11
Filing date: 2018-10-11
Publication date: 2019-01-25
Anticipated expiration: 2038-10-11
Also published as: CN109268546B

Abstract

The present invention relates to jetting machine technical fields, more particularly to a kind of overflow system, including valve seat (1), it is embedded the sealing ring (2) in valve seat (1), it is arranged in valve seat (1) inner valve stem (3), the spool (4) being set on valve rod (3) and the spring (5) for resisting spool (4), spool (4) excircle and sealing ring (2) are interference fitted, and the spool (4) is divided into three parts along valve rod direction, it is followed successively by first part from top to bottom, second part and Part III, and first part's excircle is equipped with overflow chute (6), Part III excircle is equipped with underflow chute (7).This overflow system service life is longer and noise is smaller.

Description

Overflow system

Technical field

The present invention relates to jetting machine technical field more particularly to a kind of overflow systems.

Background technique

Overflow system is the important component of jetting machine.The overflow system of the prior art is as shown in Figure 1, it is main Including valve seat 1 ', the sealing ring 2 ' being embedded in valve seat, setting valve seat inner valve stem 3 ', the spool 4 ' being set on valve rod and For resisting the spring 5 ' of spool because the spool of the prior art be using similar shuttle-type structure, be not always with it is close Seal contact offsets, and for overflow, so needing to reserve certain overflow gap between spool and valve seat, thus leads Cause following disadvantage:

1, because spool is not contacted always with sealing ring and offseted, sealing ring is squeezed when spool is mobile under pressure After be easy to keep sealed ring deformation excessive so that sealing ring service life is lower；

2, it because spool is not contacted always with sealing ring and offseted, is equivalent to valve rod and spool only has lower part to have a branch What support point supported always, and top does not have supporting point to support always, when being thus easy to cause spool mobile, spool can control rolling It is dynamic, bump against with valve base inner wall, so that the service life of spool is lower；

3, because there are certain overflow gap between spool and valve seat, such overflow system is easy at work because spool is left Right swing and generate the birdie of perverse ear a kind of.

Summary of the invention

The technical problems to be solved by the present invention are: providing, a kind of service life is longer and the lesser overflow system of noise.

The technical scheme adopted by the invention is that: a kind of overflow system, including valve seat, the sealing ring being embedded in valve seat, Valve seat inner valve stem, the spool being set on valve rod and the spring for resisting spool, spool excircle and sealing ring are set Interference fit, and spool is divided into three parts along valve rod direction, is followed successively by first part, second part and third portion from top to bottom Point, and first part's excircle is equipped with overflow chute, Part III excircle is equipped with underflow chute.

Using the above structure compared with prior art, the invention has the following advantages that by spool excircle and sealing ring mistake It is full of cooperation, without being made as shuttle-type, can remains to contact with sealing ring in the spool course of work in this way and offset, so that Sealing ring stress is relatively uniform, it is not easy to occur deforming excessive situation, so that sealing ring service life is longer；And valve Core can be contacted always with sealing ring when working and be offseted, so that the assembly upper and lower ends of valve rod and spool have a branch respectively Support point, such spool not will shake left and right at work, so that the service life of spool is also longer；And because spool work It not will shake left and right when making, so the noise generated is also smaller；It is finally provided with overflow chute and underflow chute, it in this way can be Spool is contacted with sealing ring always offset in the case where the realization relief function that also can be convenient.

Preferably, spool is cylinder.In this way, the distance between spool excircle and sealing ring when spool is mobile Or the same, so that sealing ring stress is relatively uniform when spool is mobile.

Preferably, overflow chute is uniformly arranged on first part's excircle, underflow chute is uniformly arranged on third portion On outer circumference.In this way, flushing effect is preferable.

Preferably, overflow chute and underflow chute are arranged along valve rod direction.In this way, overflow launder processing technology It is convenient, so that processing cost is lower.

Preferably, the groove depth of overflow chute and underflow chute is less than the diameter of sealing ring.In this way, sealing ring is not It can excessively be embedded into overflow launder and overflow launder is blocked.

Preferably, being additionally provided with the limited step of limit spool moving distance on valve seat.Setting can prevent spring in this way Generates pressure because decrement is excessive and deform influence spring force.

Detailed description of the invention

Fig. 1 is the cross-sectional view of prior art overflow system.

Fig. 2 is the cross-sectional view of overflow system of the present invention.

It is as shown in the figure: 1 ', the valve seat of prior art overflow system；2 ', the sealing ring of prior art overflow system；3 ', existing There is the valve rod of technology overflow system；4 ', the spool of prior art overflow system；5 ', the spring of prior art overflow system；1, valve Seat；2, sealing ring；3, valve rod；4, spool；5, spring；6, overflow chute；7, underflow chute；8, limited step；9, sealing element； 10, sliding block；11, microswitch.

Specific embodiment

The present invention is described further below in conjunction with attached drawing and specific embodiment, but the present invention be not limited only to it is following Specific embodiment.

Specific embodiment one, a kind of overflow system including valve seat 1, the sealing ring being embedded in valve seat 12, are arranged in valve seat 1 inner valve stem 3, the spool 4 being set on valve rod 3 and the spring 5 for resisting spool 4, in which:

Spool 4 is cylinder, and 4 excircle of spool and sealing ring are interference fitted, and be moved forward and backward in valve seat 1 in spool 4 In the process, spool 4 is combined with sealing ring 2 always；And spool 4 is divided into three parts along valve rod direction, from top to bottom according to Secondary is first part, second part and Part III, and first part's excircle is equipped with overflow chute 6, outside Part III Circumference is equipped with underflow chute 7, the specific thickness of three parts be according to the actual situation depending on, but in this specific embodiment In, first part is identical as the thickness of Part III.And the gap setting between spool and valve seat is at 0.01-0.1mm, than existing There is the gap of technology that can do much smaller.

Sealing element 9 also is provided between 3 lower end of valve rod and valve seat 1.

And this is specifically to further comprise sliding block 10 and microswitch 11,3 bottom of valve rod and 10 phase of sliding block in embodiment It supports, when valve rod 3 moves down, will push the movement of sliding block 10, sliding block 10 can squeeze the contact of microswitch 11.

Overflow chute 6, which is mainly used for closing when rifle is shut down, unloads stream, and underflow chute 7 is mainly used for when work more than disposing leak Pressure.

Specific embodiment two, the difference with specific embodiment one are that spool 4 is cylindrical shape in specific embodiment two.

Specific embodiment three, the difference with specific embodiment one be, also sets up in valve seat in specific embodiment three limited Position step 8, can be limited step 8 when spool 4 is mobile in this way and block.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of skill in the art that it still can be right Technical solution documented by previous embodiment is modified, or is replaced on an equal basis to part of technical characteristic；And these It modifies or replaces, the essence of corresponding technical solution is not made to be detached from the spirit and model of technical solution of various embodiments of the present invention It encloses.

Claims

1. a kind of overflow system including valve seat (1), the sealing ring (2) being embedded in valve seat (1), is arranged in valve seat (1) inner valve stem (3), the spool (4) being set on valve rod (3) and the spring (5) for resisting spool (4), it is characterised in that: the spool (4) excircle and sealing ring (2) are interference fitted, and the spool (4) is divided into three parts along valve rod direction, is followed successively by from top to bottom First part, second part and Part III, and first part's excircle is equipped with overflow chute (6), Part III Excircle is equipped with underflow chute (7).

2. overflow system according to claim 1, it is characterised in that: the spool (4) is cylinder.

3. overflow system according to claim 1, it is characterised in that: the overflow chute (6) is uniformly arranged on first On outer circumference, the underflow chute (7) is uniformly arranged on Part III excircle.

4. overflow system according to claim 1, it is characterised in that: the overflow chute (6) and underflow chute (7) are equal It is arranged along valve rod direction.

5. overflow system according to claim 1, it is characterised in that: the overflow chute (6) and underflow chute (7) Groove depth is less than the diameter of sealing ring (2).

6. overflow system according to claim 1, it is characterised in that: be additionally provided with limit spool (4) on the valve seat (1) and move The limited step (8) of dynamic distance.