CN203286061U

CN203286061U - Check valve

Info

Publication number: CN203286061U
Application number: CN2013203087544U
Authority: CN
Inventors: 张朝鑫; 郑森辉; 党保国
Original assignee: Xiamen Machine-Building Co Ltd Of Ying Shuo Section
Current assignee: Xiamen Insvac Intelligent Equipment Co ltd
Priority date: 2013-05-31
Filing date: 2013-05-31
Publication date: 2013-11-13
Anticipated expiration: 2023-05-31

Abstract

The utility model discloses a check valve. The check valve comprises a valve body, and is characterized in that the valve body is internally equipped, from top to bottom and in sequence, with a PTFE taper seat, a steel ball, and a PTFE inner spherical surface pressure head; and the PTFE inner spherical surface pressure head is connected with a spring through a pressure lever. With adoption of the abovementioned technical scheme, sealing reliability of the check valve is greatly raised, and maintenance costs of the check valve are reduced.

Description

A kind of safety check

Technical field

The utility model relates to valve field, particularly a kind of safety check.

Background technique

The plunger type metering pump rear end generally all must arrange a safety check, as shown in Figure 1, to guarantee metering pump piston material in the pipeline of rear end in the pumpback process, can not affected by resorption the accuracy of next stroke metering.

Existing check valve structure mainly contains three kinds as shown in Figure 2, Figure 3 and Figure 4.

Safety check characteristics shown in Figure 2 are: place a steel ball in the taper steel bushing, steel ball forms line with the taper cylinder sleeve and contacts; In metering pump piston pumpback process, under the effect of the pull of vacuum of the generation of the gravity of steel ball and pumpback, utilize this line contact and form sealing.The shortcoming of this sealing means is mainly: it is unreliable to seal, particularly, for the lower material of viscosity,, because be the steel to steel contact, there is no flexible compensation and reparation, and the surface of steel ball and taper steel bushing is easily scratched by the filler in material or other materials, and produce, reveals.

Safety check characteristics shown in Figure 3 are: place equally a steel ball in taper sheath, and be provided with a cylinder, in metering pump piston pumpback process, the air cylinder driven depression bar is pressed on steel ball on the taper sheath conical surface.The shortcoming of this sealing means is mainly: same, the surface of steel ball and taper steel bushing is easily scratched by the filler in material or other materials; And motive sealing need to be set, and easily wearing and tearing are toward the outside material that leaks in motive sealing, and maintenance cost is high.

The characteristics of safety check shown in Figure 4 are:, with male cone (strobilus masculinus) sleeve of spring compression, have an O type ring recess on male cone (strobilus masculinus), adopt O type circle and taper sheath inner conical surface to form sealing.The shortcoming of this sealing means is mainly: the surface of same male cone (strobilus masculinus) and taper steel bushing is easily scratched and the impact sealing by the filler in material or other materials; The sleeve male cone (strobilus masculinus) is difficult to guarantee to be worked into consistent and the impact sealing with taper sheath inner conical surface tapering; The spring location endoporus of male cone (strobilus masculinus) sleeve is long-pending filler easily, and affects the elasticity of spring, thereby affects sealing effect.

Summary of the invention

For the problems referred to above, the purpose of this utility model is to provide a kind of can significantly improve sealing effect, increases the safety check of working life, reduction maintenance cost.

For achieving the above object, the technological scheme that the utility model proposes is: a kind of safety check, comprise valve body, it is characterized in that: PTFE conical seat, steel ball, PTFE inner ball surface pressure head are installed in described valve body from the bottom up successively, and described PTFE inner ball surface pressure head is connected with spring by depression bar.

Further, described valve body is comprised of bottom feed piece, jacket casing, top discharging piece, top gland.

Further, also be provided with an adjusting bolt on the gland of described top, described adjusting bolt is connected with spring.

Further, be provided with the sealing round knot between described adjusting bolt and spring.

Further, described sealing round knot is provided with a seal groove, and described seal groove is provided with an O RunddichtringO.

Further, described top gland is provided with dump tank.

Adopt technique scheme, the beneficial effect that safety check described in the utility model has is:

1) adopt steel ball contact with the soft or hard of PTFE conical seat sealing replacement steel ball and steel bushing firmly-firmly contact sealing, utilize the PTFE material good wear resistance, receive dirt and excellent surface repair ability, sealing reliability significantly improves;

2) adopt built-in spring to force compact form, do not need motive sealing, reliable to outside seal, and maintenance cost is low;

3) location hole of the spring on the gland of top is inverted, and oral area, and is provided with dump tank down, and place is not easy incrustation at spring, thereby guarantees the reliability of the elastic force of spring;

4) be provided with adjusting bolt, after the taper of PTFE conical seat had the part wearing and tearing, the elasticity of adjustable springs guaranteed the reliability of sealing, thereby had extended the working life of PTFE conical seat, had reduced maintenance cost;

5) adopt PTFE inner ball surface pressure head, located well the concentricity of steel ball, and can not cause impression on the steel ball surface, guaranteed the degree of finish on steel ball surface, thereby guaranteed sealing effect.

Description of drawings

Fig. 1 is that plunger type metering pump arranges the safety check schematic diagram;

Fig. 2-4 are prior art check valve structure schematic diagram;

Fig. 5 is check valve structure schematic diagram described in the utility model;

Wherein: 1. bottom feed piece, 2.PTFE conical seat, 3. steel ball, 4.PTFE inner ball surface pressure head, 5. jacket casing, 6. depression bar, 7. top discharging piece, 8. spring, 9. sealing round knot, 10.O RunddichtringO, 11. top glands, 12. adjusting bolts, 13. dump tanks.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described further.

As shown in Figure 5, a kind of safety check, comprise valve body, valve body is comprised of bottom feed piece 1, jacket casing 5, top discharging piece 7, top gland 11, PTFE conical seat 2, steel ball 3, PTFE inner ball surface pressure head 4 are installed in valve body from the bottom up successively, and described PTFE inner ball surface pressure head 4 is connected with spring 8 by depression bar 6.Also be provided with in addition an adjusting bolt 12 on top gland 11, described adjusting bolt 12 is connected with spring 8, the elasticity that is used for Regulation spring 8,8, adjusting bolt 12 and spring are provided with sealing round knot 9, and sealing round knot 9 is provided with a seal groove, described seal groove is provided with an O RunddichtringO 10, and top gland 11 also is provided with dump tank 13.

The working principle of safety check described in the utility model is: when front end metering pump piston extrusion dnockout, steel ball 3 is beared down on one out by material, with PTFE conical seat 2, breaks away from and forms gaps, expects that extrudate flow downstream from gap.When front end metering pump piston pumpback suction, steel ball 3 is under the effect of the pull of vacuum that self gravitation, spring 8 elastic force and the pumpback of metering pump piston produce, tightly fit with PTFE conical seat 2 inner conical surfaces, and form good sealing, make the ducted material in rear end can be by resorption, the material that guarantees the rear end pipeline is full of, thereby it is accurate to guarantee that metering pump measures in next stroke.。

Although in conjunction with preferred embodiment, specifically show and introduced the utility model; but the those skilled in the art should be understood that; within not breaking away from the spirit and scope of the present utility model that appended claims limits; in the form and details the utility model is made a variety of changes, be protection domain of the present utility model.

Claims

1. a safety check, comprise valve body, it is characterized in that: PTFE conical seat, steel ball, PTFE inner ball surface pressure head are installed in described valve body from the bottom up successively, and described PTFE inner ball surface pressure head is connected with spring by depression bar.

2. a kind of safety check according to claim 1, it is characterized in that: described valve body is comprised of bottom feed piece, jacket casing, top discharging piece, top gland.

3. a kind of safety check according to claim 2, it is characterized in that: also be provided with an adjusting bolt on the gland of described top, described adjusting bolt is connected with spring.

4. a kind of safety check according to claim 3, is characterized in that: be provided with the sealing round knot between described adjusting bolt and spring.

5. a kind of safety check according to claim 4, it is characterized in that: described sealing round knot is provided with a seal groove, and described seal groove is provided with an O RunddichtringO.

6. a kind of safety check according to claim 2, it is characterized in that: described top gland is provided with dump tank.