CN209100717U

CN209100717U - Overflow system

Info

Publication number: CN209100717U
Application number: CN201821646070.4U
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: 2019-07-12
Anticipated expiration: 2028-10-11

Abstract

The utility model 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 utility model 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, when mobile extruding is close under pressure for spool It is easy to keep sealed ring deformation excessive after seal, 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 one What a supporting point supported always, and top does not have supporting point to support always, when being thus easy to cause spool mobile, spool can be left Right shaking is bumped 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 of valve Core swings and generates a kind of ear-piercing birdie.

Utility model content

The lesser overflow system of longer and noise the technical problem to be solved by the utility model is to provide a kind of service life System.

The technical scheme adopted by the utility model is a kind of overflow system, including valve seat, the sealing being embedded in valve seat It encloses, valve seat inner valve stem, the spool being set on valve rod and the spring for resisting spool, spool excircle and sealing is set Circle interference fit, and spool is divided into three parts along valve rod direction, is followed successively by first part, second part and third from top to bottom Part, 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 utility model has the advantage that spool excircle and sealing Circle interference fit can remain to contact with sealing ring and offset in the spool course of work in this way without being made as shuttle-type, in turn 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 And can contact always and offset with sealing ring when spool work, so that the assembly upper and lower ends of valve rod and spool have one respectively A supporting point, such spool not will shake left and right at work, so that the service life of spool is also longer；And because valve Core not will shake left and right when working, so the noise generated is also smaller；It is finally provided with overflow chute and underflow chute, in this way may be used With the realization relief function that also can be convenient in the case where spool contacts with sealing ring offset always.

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 the utility model overflow system.

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 utility model is described further below in conjunction with attached drawing and specific embodiment, but the utility model is not only It is limited to following specific embodiments.

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 front and back is moved in valve seat 1 in spool 4 In dynamic process, spool 4 is combined with sealing ring 2 always；And spool 4 is divided into three parts along valve rod direction, on to Under be followed successively by first part, second part and Part III, and first part's excircle is equipped with overflow chute 6, third portion Outer 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 implementation In example, 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 The gap of the prior art can be done 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 above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations； Although the utility model is described in detail with reference to the foregoing embodiments, it will be understood by those of skill in the art that its according to It can so modify to technical solution documented by previous embodiment, or part of technical characteristic is replaced on an equal basis It changes；And these are modified or replaceed, and the essence of corresponding technical solution is not made to be detached from various embodiments of the utility model technical side The spirit and scope of case.

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.