CN109519570A

CN109519570A - Check valve for SCR urea pump

Info

Publication number: CN109519570A
Application number: CN201910007627.2A
Authority: CN
Inventors: 崔伟杰; 张坤磊; 高宝平; 李刚
Original assignee: Wuxi Weifu High Technology Group Co Ltd
Current assignee: Wuxi Weifu High Technology Group Co Ltd
Priority date: 2019-01-04
Filing date: 2019-01-04
Publication date: 2019-03-26
Anticipated expiration: 2039-01-04
Also published as: CN109519570B

Abstract

The present invention relates to a kind of check valves for SCR urea pump, including valve body, valve ball, spring base, spring and sealing ring；Spring base with cavity is limited with the valve body with cavity by claw；And the sealing ring is set in the lower end of spring base and the contact site of valve body；Spring is located at the intracorporal top of chamber of spring base, and the lower end of spring is contacted with valve ball；Valve ball and sealing ring intermittent contacts；Spring base is equipped with outlet, and valve body is equipped with import.The present invention provides a kind of sealed reliable, and water absorbing capacity is strong, the check valve assembly of high reliablity.

Description

Check valve for SCR urea pump

Technical field

The present invention relates to a kind of check valve, specifically a kind of check valve for SCR urea pump.

Background technique

Check valve is a kind of control element for controlling fluid flow direction, and specifically, check valve only allows fluid edge Entrance enters, only allows one-directional fluid flow from outlet outflow namely check valve；Wherein, fluid includes liquids and gases.Unidirectionally The one-way flow characteristic of valve makes check valve be widely used in field of fluid control.The SCR urea spray being widely used at present The system of penetrating is broadly divided into two classes: air assisted injection system and no air assisted injection system.Air assisted injection system is general Metering is completed then with compressed air mixing jetting into tail gas by urea jet pump；No air assisted injection system is generally by urinating Element pump establishes pressure, is then sprayed by the atomization that the measuring jet for the electromagnetic type being mounted on exhaust pipe controls urea liquid Penetrate, the urea pump of the spraying system of both patterns is frequently included according to functional requirement: 1. pump part (can be diaphragm pump, Gear pump, plunger pump etc.)；2. pressure sensor device (for pressure closed loop control and OBD diagnosis)；3. back suction or air purging dress It sets and (can be back suction pump, reversal valve or air switching sol etc.)；4. heatingization ice system (including heat-generating units and temperature it is anti- Present part), air assist system further includes air-pressure controlling valve, further includes independent control unit in all pumps.Above point Analysis influences the key of water pumping ability in check valve, how to design unidirectional it is found that the urea pump of two kinds of patterns requires to pump part Valve becomes the difficult point of SCR urea pump design.In old-fashioned one-way valve structures, check valve assembling rear valve body and spring base do not limit completely Position, sealing ring have displacement risk；Check valve poor sealing needs soaked to improve water absorbing properties when urea pump test, influence Production efficiency；Since sealing ring does not limit, during non-return valve operational, sealing ring is moved with valve ball, when return, sealing ring It should be sealed with valve ball, again with valve seal, the bilateral dynamic sealing of sealing ring, seal failure risk is larger.Check valve is deposited at present Main problem have: leakproofness is poor, and water absorbing capacity is insufficient, and reliability is low etc..

Summary of the invention

The object of the present invention is to provide a kind of check valves for SCR urea pump, to improve leakproofness, reliability and inhale The check valve of outlet capacity.

According to technical solution provided by the invention, the check valve for SCR urea pump, including valve body, valve ball, spring Seat, spring and sealing ring；Spring base with cavity is limited with the valve body with cavity by claw；And in the lower end of spring base The sealing ring is set with the contact site of valve body；Spring is located at the intracorporal top of chamber of spring base, the lower end of spring and valve ball Contact；Valve ball and sealing ring intermittent contacts；Spring base is equipped with outlet, and valve body is equipped with import.

Valve ball is arranged concentrically with import, and the radius of valve ball is greater than the radius of import.

There is bottom plate in the middle part of valve body, the import is set to the middle part of bottom plate；It is upwardly extended in the outer rim setting of bottom plate Annular solid, and the claw upwardly extended is set in the upper end of annular solid；There is inside latch closure outstanding in the upper end of the claw；In bullet Card slot corresponding with latch closure is arranged in the middle part of spring abutment, and the valve body is clamped using the card slot on the latch closure and spring base on claw.

The claw has 4.

Valve body and spring base apply pressing force to sealing ring in mutual clamping, and under the reaction force of sealing ring mutually Clamping.

The cross-sectional shape of sealing ring is " ∞ " that there are lower notches at middle part.

Downward projection of upper protrusion is set in the lower end of spring base, setting is convex under projecting upwards on the bottom plate of valve body It rises；The upper protrusion is stuck in the top and bottom of sealing ring with the lower convexity.

On the top of spring base, 4 taper fulcrums are set.

Cross supporting frame is arranged in the outlet of spring base.

The invention has the advantages that

1, valve body and spring base are using four claw buckles, and structure is simple, easy for installation, high reliablity；

2, sealing ring cross-section uses " ∞ " shape, realizes unilateral fixation, bilateral sealing, sealing effect is good, high reliablity.

Detailed description of the invention

Attached drawing 1 is structural schematic diagram of the invention.

Attached drawing 2 is the top view of spring base.

Attached drawing 3 is the bottom view of spring base.

Description of symbols: 1- spring base, 2- spring, 3- cavity, 4- valve ball, 5- sealing ring, 6- valve body, 7- import, 8- Outlet, 9- taper fulcrum, 10- card slot, 11- buckle, 12- claw, the upper protrusion of 13-, 14- lower convexity, 15- bottom plate, 16- support Frame.

Specific embodiment

The present invention is further explained in the light of specific embodiments.

A kind of check valve for SCR urea pump, including valve body 6, valve ball 4, spring base 1, spring 2 and sealing ring 5；It has The spring base 1 of cavity 3 is limited with the valve body 6 with cavity by claw 12；And the contact in the lower end of spring base 1 and valve body 6 The sealing ring 5 is arranged in position；Spring 2 is located at the intracorporal top of chamber of spring base 1, and the lower end of spring 2 is contacted with valve ball 4；Valve Ball 4 and 5 intermittent contacts of sealing ring, spring base 1 are equipped with outlet 7, and valve body 6 is equipped with import 8, so-called intermittent contacts, i.e., By the fluid of runner, due to direction difference, the pressure direction applied to valve ball is different；When fluid enters from following import 8 It up flows, and when Fluid pressure is sufficiently large, just forces valve ball 4 that the pretightning force of spring 2 is overcome to leave sealing ring 5, channel is beaten It opens, fluid is flowed out through cavity 3 from outlet 7；When Fluid pressure is little, valve ball 4 under spring force, is pressed on sealing ring On 5, channel is in close state.

Valve ball 4 is arranged concentrically with import 8, and the radius of valve ball 4 is greater than the radius of import 8, in case valve ball 4 is de- from import 8 It falls.

There is bottom plate 15 at the middle part of valve body 6, and the import 8 is set to the middle part of bottom plate 15；The outer rim of bottom plate 15 be arranged to The annular solid of upper extension, and the claw 12 of the specific elasticity upwardly extended in the setting of the upper end of annular solid；The claw 12 it is upper There is inside latch closure 11 outstanding at end；Card slot 10 corresponding with latch closure 11 is set at the middle part of spring base 1, the valve body 6 utilizes card The card slot 10 on latch closure 11 and spring base 1 on pawl 12 is clamped, while applying certain pressure to sealing ring 5, guarantees sealing ring 5 It effectively limits and keeps concentric with valve ball 4.

The claw 10 can have symmetrically arranged 4, to keep the power of clamping relatively uniform, after check valve assembling, and valve Body 6 and spring base 1 are limited using claw 12, and under the reaction force of sealing ring 5, valve body 6 and spring base 1 are closely together, peace Dress is secured.

The cross-sectional shape of sealing ring 5 is that middle part has cross " ∞ " shape of recess, with ensure after installing with valve body 6 and spring base 1 with one heart, will not shift in the course of work.5 abnormity design of sealing ring, outer ring are fastened by valve body 6 and spring base 1, static seal；Inner ring With 4 dynamic sealing of valve ball；Realize unilateral fixation, bilateral sealing, sealing effect is good.

It is arranged downward projection of raised 13 in the lower end of spring base 1, setting projects upwards on the bottom plate 15 of valve body 6 Lower convexity 14；Described raised 13 are stuck in the upper and lower surface of sealing ring 5 with the lower convexity 14.Upper raised 13 and lower convexity 14 are stuck in the depressed area of sealing ring when in use, have the function that clamping and positioning seal ring 5.

4 taper fulcrums 9 are set on the top of spring base 1, for the link position of fixed spring seat 1 and adapter tube.

Cross supporting frame 16 is arranged in the outlet 7 of spring base 1, it is therefore an objective to support spring 2.

The course of work is as follows: when liquid flows from the top to the bottom, valve ball 4 is close to sealing ring 5 under spring force Inner ring, runner are sealed, and liquid flowing is ended；When liquid moves from bottom to top, valve ball 4 is under the action of fluid pressure gram The inner ring that spring force is detached from sealing ring 5 is taken, runner is opened, liquid flows upwards, to realize that liquid unidirectionally passes through function.

Claims

1. a kind of check valve for SCR urea pump, including valve body (6), valve ball (4), spring base (1), spring (2) and sealing ring (5)；It is characterized in that: the spring base (1) with cavity (3) is limited with the valve body (6) with cavity by claw (12), and in bullet Sealing ring (5) are arranged in the lower end of spring abutment (1) and the contact site of valve body (6)；Spring (2) be located at spring base (1) chamber it is intracorporal on The lower end in portion, spring (2) is contacted with valve ball (4)；Valve ball (4) can be with sealing ring (5) intermittent contacts；Spring base is set on (1) Have outlet (7), valve body (6) is equipped with import (8).

2. it is used for the check valve of SCR urea pump as described in claim 1, it is characterized in that: valve ball (4) is arranged concentrically with import (8), And the radius of valve ball (4) is greater than the radius of import (8).

3. it is used for the check valve of SCR urea pump as described in claim 1, it is characterized in that: have bottom plate (15) in the middle part of valve body (6), The import (8) is set to the middle part of bottom plate (15)；The annular solid upwardly extended is set in the outer rim of bottom plate (15), and in annular The claw (12) upwardly extended is arranged in the upper end of body；There is inside latch closure (11) outstanding in the upper end of the claw (12)；In spring The middle part of seat (1) is arranged corresponding with latch closure (11) card slot (10), the valve body (6) using on claw (12) latch closure (11) and Card slot (10) clamping on spring base (1).

4. the check valve of SCR urea pump is used for as claimed in claim 3, it is characterized in that: the claw (12) has 4.

5. the check valve of SCR urea pump is used for as claimed in claim 3, it is characterized in that: valve body (6) and spring base (1) are mutual Pressing force, and the mutual clamping under the reaction force of sealing ring (5) are applied to sealing ring (5) when clamping.

6. the check valve of SCR urea pump is used for as described in one of claim 1-5, it is characterized in that: the cross section shape of sealing ring (5) Shape is cross " ∞ " shape that there are lower notches at middle part.

7. the check valve of SCR urea pump is used for as described in claim 1, it is characterized in that: downward in the setting of the lower end of spring base (1) Raised (13) outstanding, are arranged the lower convexity (14) projected upwards on the bottom plate (15) of valve body (6)；Upper raised (13) The depressed area of sealing ring (5) top and bottom is stuck in the lower convexity (14).

8. the check valve of SCR urea pump is used for as described in claim 1, it is characterized in that: being arranged 4 on the top of spring base (1) Taper fulcrum (9).

9. the check valve of SCR urea pump is used for as described in claim 1, it is characterized in that: cross is set in the outlet (7) of spring base (1) Support frame (16).