CN205638851U - A one -way valve for vacuum pump - Google Patents

Abstract

The utility model discloses an one -way valve for vacuum pump. Including case and disk seat, the disk seat is equipped with the valve seat hole who is located the center, valve core head end from the disk seat tip interference fit among the valve seat hole that impresses to main aspects for gaseous cavity of following disk seat main aspects one side passes through the cavity uniflow of case to disk seat tip one side. The utility model discloses simple structure, it is unobstructed to admit air, and sealing performance is good, and machinery is made an uproar for a short time with pneumatic sound. The efficiency of elevator pump that can be fine.

Description

A kind of Non-return air valve for vacuum pump

Technical field

This experiment is novel relates to a kind of Non-return air valve for vacuum pump, is especially used in electronic vacuum pump, belongs to pump technical field.

Background technology

Nowadays the check valve form being used in vacuum pump is varied.Check valve is used in vacuum pump for isolating air formation negative pressure, has again the function of one-way flow.The slightly aobvious complexity of the structure of many check valves now, or difficult processing cost is high, the problem that one-way air inlet is not enough or obstructed.And these problems directly affects the overall efficiency of vacuum pump.

Retrieval finds the breather check valve in cn105114283A entitled " straight line opposed piston electric vacuum pump ", uses a mode at valve seat fixed with socket cap spool.But it is designed with the plate-like of an equal thickness, there is no the linear sealing of correspondence, poor sealing can be caused.Spool rigidity is low, and in intake process, aperture is excessive, if the too small meeting of spool natural frequency causes the problem making noise increase that easily resonates.

Retrieval finds that the spool of the breather check valve in cn2014121160A entitled " double wave sphere piston type electric vacuum pump " is the disk having middle with hole, a metal rivet clamped by spool with valve seat.The contact surface of valve seat is machined with sealing endless belt.The shortcoming of this design is high cost, assembling complexity.

Utility model content

For the defect of existing vacuum pump breather check valve, the utility model proposes a kind of Non-return air valve for vacuum pump, air inlet is unobstructed, good seal, and simple in construction is easily processed, and can improve vacuum pump performance.

In order to reach object above, the technical solution adopted in the utility model is:

This utility model includes spool and valve seat, valve seat is provided with the valve seat through-hole being positioned at center, spool head end enters interference fit valve seat through-hole from valve seat small end to big side pressure so that the gas chamber from valve seat big end side passes through the spool chamber one-way flow to valve seat small end side.

Multiple steam vent circumferentially it is interval with around the valve seat through-hole of described valve seat, valve seat large end face is as valve seat end face, small end face is provided around the inside and outside twice annular stair-step of indent being positioned at valve seat through-hole, the outer face of valve seat is connected with the side wall transition of outer ring stair-step by male cone (strobilus masculinus), it is connected by inner conical surface transition between annular stair-step with outer ring stair-step, the outer ring stair-step edge being connected with inner conical surface forms ring-shaped step, the edge chamfering that annular stair-step is connected with valve seat through-hole, the circle spacing at inner conical surface place is provided with the steam vent at multiple through two ends.The described conical surface is all formed by chamfering.

Described spool is mainly by disk like thin slice, spool post with spool stigma three part is the most affixed forms, disk like thin slice is in the cone with the spool conical surface, spool post is between the small end and spool stigma of disk like thin slice, the diameter of spool stigma is more than spool post, and the spool conical surface of disk like thin slice cone is positioned at the one end connecting spool post.

When, after described spool with valve seat close fit, being in close contact formation sealing ring by the spool conical surface and ring-shaped step.Owing to the conical surface of valve seat and the frustoconical bevel angle of spool are different, the frustoconical bevel angle of valve seat is more than spool frustoconical bevel angle, and spool disk like thickness is less than the valve seat taper surface degree of depth, and the step laminating that can be formed with the valve seat conical surface behind spool location forms a sealing ring.

Described spool stigma diameter is more than valve seat through-hole, spool post and valve seat through-hole interference fit.

Described valve seat adds discoid through heat treatment steel machine.

Described disk like thin slice is by made by high-and low-temperature resistance, favorable elasticity material.

The described sidewall between valve seat large end face and small end face is provided with annular groove, and annular groove is used for embedding in installing hole formation riveting and connects, and the inward flange in the installing hole hole coordinated with annular groove is squeezed in annular groove the hard sealing of formation.

Traditional check valve is improved by this utility model, has the advantage that and effect during use:

1. install simple.Only having spool and two parts of valve seat, be pressed into joining during installation, spool is the most detachable.

2. having certain extruding after mounting owing to this use is novel, the seal ring seal of formation is effective.

3. the air flue formed according to the mode of air inlet is more reasonable, and the gas more smooth and easy gas that decreases of flowing, to spool disturbance, reduces the impact of pneumatic noise.

4. spool is disk like, and according to air inflow size, aperture can change, the change of the spool zone of action causes the rigidity of the zone of action to change, the natural frequency of effect part is in a variable condition, can be prevented effectively from spool and resonate with piston intake, thus reduce noise.

Accompanying drawing explanation

Fig. 1 is this utility model sectional view.

Fig. 2 is the structural representation of this utility model spool.

Fig. 3 is the structural representation of this utility model valve seat.

Fig. 4 is this utility model gas flow and is firmly tightly connected schematic diagram.

In figure: spool 1, spool post 11, spool stigma 12, the conical surface 13, disk like thin slice 14, valve seat 2, valve seat through-hole 21, valve seat end face 22, steam vent 23, annular groove 24, ring-shaped step 25, inner conical surface 26, male cone (strobilus masculinus) 27, chamfering 28.

Detailed description of the invention

The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.

As shown in Figure 1, this utility model includes spool 1 and valve seat 2, valve seat 2 is provided with the valve seat through-hole 21 being positioned at center, spool 1 head end enters interference fit valve seat through-hole 21 from valve seat 2 small end to big side pressure so that gas holds greatly the chamber of side by the spool 1 chamber one-way flow to valve seat 2 small end side from valve seat 2.

As shown in Figure 3, multiple steam vent 23 circumferentially it is interval with around the valve seat through-hole 21 of valve seat 2, valve seat 2 large end face is as valve seat end face 22, small end face is provided around the inside and outside twice annular stair-step of indent being positioned at valve seat through-hole 21, shoulder hole is formed together with valve seat through-hole 21, the outer face of valve seat 2 is connected with the side wall transition of outer ring stair-step by male cone (strobilus masculinus) 27, it is connected by inner conical surface 26 transition between annular stair-step with outer ring stair-step, the outer ring stair-step edge being connected with inner conical surface 26 forms ring-shaped step 25, ring-shaped step 25 is identical with the tapering of inner conical surface 26, the edge chamfering 28 that annular stair-step is connected with valve seat through-hole 21, the circle spacing at inner conical surface 26 place is provided with the steam vent 23 at multiple through two ends.

As shown in Figure 2, spool 1 is mainly by disk like thin slice 14, spool post 11 with spool stigma 12 3 part is the most affixed forms, disk like thin slice 14 is in the cone with the spool conical surface 13, spool post 11 is between the small end and spool stigma 12 of disk like thin slice 14, the diameter of spool stigma 12 is more than spool post 11, and the spool conical surface 13 of disk like thin slice 14 cone is positioned at the one end connecting spool post 11.

Spool stigma 12 diameter is more than valve seat through-hole 21, spool post 11 and valve seat through-hole 21 interference fit.Spool 1 is formed the most spacing through contacting with valve seat end face 22 after valve seat through-hole 21 by spool stigma 12.

As shown in Figure 4, the sidewall between valve seat 2 large end face and small end face is provided with annular groove 24, and annular groove 24 is used for embedding in installing hole formation riveting and connects, and the inward flange in the installing hole hole coordinated with annular groove 24 is squeezed in annular groove the hard sealing of formation.

As shown in Figure 4, the invention enables valve seat 2 two ends to be divided into two chambers of isolation, after isolation gas can only from valve seat 2 hold greatly the chamber of side by the spool 1 chamber to small end side, and not reversible flowing, it is achieved non-return valve function.

It is of the present utility model that to be embodied as work process as follows:

Valve seat uses to be had the metal machine of some strength through Overheating Treatment and adds part, and profile is plate-like.A valve seat through-hole and the steam vent of several uniform circular arrangement is processed at one end face circle centre position of plate-like.Spool 1 uses high-low temperature resistant to have certain elastic material.

During installation, spool stigma is formed location from the press-in of valve seat through-hole band chamfering side until spool stigma passes and trails.

Gas holds greatly the chamber of side to flow into through steam vent 23 from valve seat 2, pushes the spool conical surface 13 open, and the gap between the spool conical surface 13 and ring-shaped step 25 flows out to, to valve seat 2 small end one side cavity, form one-way flow.Otherwise because of after spool 1 with valve seat 2 close fit, the spool conical surface 13 is in close contact with ring-shaped step 25 and forms sealing ring, spool is pressed on the sealing ring of formation by the gas of flowing, therefore cannot be flowed into valve seat 2 from the chamber of valve seat 2 small end side through steam vent 23 and hold greatly the chamber of side.

Claims (6)

1. the Non-return air valve for electronic vacuum pump, it is characterized in that: include spool (1) and valve seat (2), valve seat (2) is provided with the valve seat through-hole (21) being positioned at center, spool (1) head end enters interference fit valve seat through-hole (21) from valve seat (2) small end to big side pressure so that the gas chamber from valve seat (2) end side greatly is by the spool (1) the chamber one-way flow to valve seat (2) small end side.

2. according to claim 1Described a kind of Non-return air valve for electronic vacuum pump, it is characterized in that: the valve seat through-hole (21) of described valve seat (2) is around circumferentially interval with multiple steam vent (23), valve seat (2) large end face is as valve seat end face (22), small end face is provided around the inside and outside twice annular stair-step of indent being positioned at valve seat through-hole (21), the outer face of valve seat (2) is connected with the side wall transition of outer ring stair-step by male cone (strobilus masculinus) (27), it is connected by inner conical surface (26) transition between annular stair-step with outer ring stair-step, the outer ring stair-step edge being connected with inner conical surface (26) forms ring-shaped step (25), the edge chamfering (28) that annular stair-step is connected with valve seat through-hole (21), the circle spacing at inner conical surface (26) place is provided with the steam vent (23) at multiple through two ends.

3. according to claim 1Described a kind of Non-return air valve for electronic vacuum pumpIt is characterized in that: described spool (1) is mainly by disk like thin slice (14), spool post (11) with spool stigma (12) three part is affixed forms, disk like thin slice (14) is in the cone with the spool conical surface (13), spool post (11) is positioned between the small end of disk like thin slice (14) and spool stigma (12), the diameter of spool stigma (12) is more than spool post (11), and the spool conical surface (13) of disk like thin slice (14) cone is positioned at the one end connecting spool post (11).

4. according to claim 3Described a kind of Non-return air valve for electronic vacuum pump, it is characterised in that: when, after described spool (1) with valve seat (2) close fit, being in close contact formation sealing ring by the spool conical surface (13) and ring-shaped step (25).

5. according to claim 3Described a kind of Non-return air valve for electronic vacuum pump, it is characterised in that: described spool stigma (12) diameter is more than valve seat through-hole (21), spool post (11) and valve seat through-hole (21) interference fit.

6. according to claim 2Described a kind of Non-return air valve for electronic vacuum pump, it is characterised in that: the described valve seat (2) sidewall between large end face and small end face is provided with annular groove (24).