CN115324692A - Control valve for preventing leakage of urea box and urea box - Google Patents
Control valve for preventing leakage of urea box and urea box Download PDFInfo
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- CN115324692A CN115324692A CN202210814120.XA CN202210814120A CN115324692A CN 115324692 A CN115324692 A CN 115324692A CN 202210814120 A CN202210814120 A CN 202210814120A CN 115324692 A CN115324692 A CN 115324692A
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- urea
- valve
- groove
- control valve
- urea tank
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 194
- 239000004202 carbamide Substances 0.000 title claims abstract description 194
- 239000007788 liquid Substances 0.000 claims description 32
- 238000007789 sealing Methods 0.000 claims description 7
- 238000013022 venting Methods 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 7
- 230000008014 freezing Effects 0.000 description 6
- 238000007710 freezing Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 210000000078 claw Anatomy 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention belongs to the technical field of diesel vehicle urea box leakage treatment, and particularly relates to a control valve for preventing leakage of a urea box and the urea box. The control valve comprises a hollow valve barrel, wherein the inner wall of the upper part of the hollow valve barrel is provided with a mounting groove for placing a valve seat, the upper part of the valve seat is provided with a first groove for placing a spring, the lower part of the valve seat is provided with a second groove in a circular truncated cone shape, the second groove is communicated with the first groove, the upper end of the spring is abutted to a top cover, and the top cover is provided with a vent hole; a connecting rod ball is accommodated in the valve barrel and comprises a connecting rod, an upper ball body and a floating body, wherein the upper ball body and the floating body are arranged at two ends of the connecting rod; the upper ball body can be tangent to the side surface of the second groove; the middle part of the valve barrel is provided with a limiting hole for a limiting rod to transversely penetrate through the valve barrel; the side of the valve barrel is provided with an air inlet positioned below the limiting hole. The urea tank can prevent urea from being excessively added into the urea tank, prevent urea from shaking and leaking, and effectively solve the problem of deformation of the urea tank caused by pressure change in the urea tank.
Description
Technical Field
The invention belongs to the technical field of diesel vehicle urea box leakage treatment, and particularly relates to a control valve for preventing leakage of a urea box and the urea box.
Background
Since the implementation of the national six regulations of automobiles, most of the national six diesel models which are newly marketed are equipped with urea systems. As urea does not belong to flammable and explosive liquid, a plurality of car owners can purchase barreled urea and fill the barreled urea by themselves.
Because the car owner often annotates by oneself, consequently can appear excessive filling often, lead to the driving in-process urea case to appear urea and reveal. In addition, after urea freezes in some extremely cold areas, the structure of the existing urea box can be cracked or obviously deformed due to the change of air pressure, so that the urea box has potential safety hazards and influences the normal use of vehicles.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a control valve of a filling and storing system for preventing liquid leakage of a urea box, which specifically adopts the following technical scheme:
a control valve for preventing liquid leakage of a urea box comprises a hollow valve barrel 6, a valve seat 3, a spring 2, a top cover 1, a connecting rod ball 4 and a limiting rod 5;
the inner wall of the upper part of the valve barrel 6 is provided with a mounting groove for placing the valve seat 3, the upper part of the valve seat 3 is provided with a first groove for placing the spring 2, the lower part of the valve seat 3 is provided with a second groove in a circular truncated cone shape, and the second groove is communicated with the first groove; the upper end of the spring 2 is abutted against the top cover 1, and the top cover 1 is fixedly connected with the valve barrel 6 and is provided with a vent hole 101;
the connecting rod ball 4 is accommodated in the valve barrel 6, and the connecting rod ball 4 comprises a connecting rod 402, an upper ball body 401 and a floating body, wherein the upper ball body 401 and the floating body are arranged at two ends of the connecting rod 402; the upper sphere 401 may be tangent to the side of the second groove;
a limiting hole 602 is formed in the middle of the valve barrel 6, and is used for the limiting rod 5 to cross the valve barrel 6, so that the upper ball 401 is located between the limiting rod 5 and the second groove;
the side of the valve barrel 6 is provided with an air inlet 601 positioned below the limiting hole 602.
When urea is filled into the urea barrel, the connecting rod ball 4 can rise due to buoyancy, so that the upper ball body 401 is continuously close to the second groove, when the urea barrel is full, the upper ball body 401 can be tangent to the side face of the second groove, a channel between the second groove and the first groove is further sealed, an air inlet channel and an air exhaust channel of the valve barrel 6 are closed, at the moment, due to the fact that the urea liquid level rises, air pressure also rises, urea cannot be added continuously, and the excessive filling of a vehicle owner is prevented. In addition, because connecting rod ball 4 has certain length, can guarantee that the liquid level has certain distance with disk seat 3, when can effectually reducing the urea case and rock, the problem that urea revealed through the air vent 101 of upper portion top cap 1 takes place.
In addition, because disk seat 3 position sets up in the upper end of valve barrel 6, consequently disk seat 3 can not lead to the jamming of disk seat 3 because of the mounting groove of urea crystallization infiltration valve barrel 6, because spring 2 installs in the mounting groove of disk seat 3, can prevent that spring 2 from contacting valve barrel 6, has avoided spring 2 to receive the influence of valve barrel 6 and has leaded to the jamming, can't exert the effort to disk seat 3.
Preferably, in the control valve for preventing the leakage of the urea tank, the bottom surface of the top cover 1 is provided with a cross bar 102 for limiting the movement of the spring 2.
Preferably, in the above control valve for preventing leakage of the urea tank, the maximum inner diameter of the second groove is smaller than the inner diameter of the mounting groove. Therefore, even when liquid flows down on the second groove of the valve seat 3, the liquid cannot directly flow into the installation groove of the valve barrel 6, urea crystallization is prevented from being accumulated in the installation groove of the valve barrel 6, and the installation groove of the valve barrel 6 and the sealing performance of the valve seat 3 are ensured.
Preferably, in the above control valve for preventing liquid leakage of the urea tank, the number of the limiting rods 5 and the number of the limiting holes 602 are 2, respectively, and the distance between 2 limiting rods 5 is smaller than the diameter of the upper sphere 401. The lowest position of the connecting rod ball 4 can be limited, and the connecting rod ball 4 is ensured to be always kept vertical inside the valve barrel 6 under the action of gravity. Meanwhile, the position of the connecting rod ball 4 in a free state can be controlled, and the connecting rod ball 4 is prevented from sliding from the bottom of the valve barrel 6.
Preferably, in the control valve for preventing the liquid leakage of the urea box, the top cover 1 is in snap connection with the valve barrel 6.
The invention also provides a urea box, which comprises a urea box body 8 and the control valve 10, wherein the control valve 10 is installed on the urea box body 8 through threaded connection or matched with a clamp through a sealing ring and the clamp, the top cover 1 is positioned outside the urea box body 8, and the rest part of the control valve 10 extends into the urea box body 8.
Preferably, in the urea box, an elbow 9 connected with the vent hole 101 is further included.
Preferably, the urea tank further comprises a urea filling pipe 13 for adding urea to the inside of the urea tank body 8, and an exhaust pipe 11; one end of the exhaust pipe 11 is located inside the urea box body 8, and has the same distance as the distance that the control valve 10 extends into the urea box body 8, and the other end is communicated with the urea filling pipe 13.
Preferably, in the urea tank, a filling cover 12 for closing the urea filling pipe 13 is further included.
Preferably, in the urea tank, the control valve 10 is connected with a threaded interface on the urea tank body through threads on the outer wall of the valve barrel 6.
The beneficial effects of the invention are as follows: the urea tank can prevent urea from being excessively added into the urea tank, avoids the problem of excessive filling from a design source, can prevent the liquid level of the urea from shaking and leaking out of the urea tank in the running process of a vehicle, can release the pressure in the urea tank in time, effectively solves the problem of deformation of the urea tank caused by pressure change in the urea tank due to urea freezing, can balance the pressure difference between the urea tank and the outside when urea crystals expand due to sudden temperature drop, and ensures that the urea tank cannot deform or be damaged.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a sectional view showing a structure of a control valve;
FIG. 2 is an inside elevational view of the control valve;
FIG. 3 is an exploded view of the control valve;
FIG. 4 is a diagram illustrating the effect of the control valve;
FIG. 5 is a schematic view showing the addition of urea to a first elevation;
FIG. 6 shows the addition of urea to a second high level schematic;
FIG. 7 is a schematic view showing the addition of urea to a third level;
FIG. 8 is a view of the control valve screw mounting of the control valve;
FIG. 9 is a view of the seal and snap installation of the control valve;
reference numerals:
1. the device comprises a top cover, 101, vent holes, 102, a cross rod, 2, a spring, 3, a valve seat, 4, a connecting rod ball, 401, an upper ball body, 402, a connecting rod, 5, a limiting rod, 6, a valve barrel, 601, an air inlet, 602, a limiting hole, 7, urea, 8, a urea box, 9, a bent pipe, 10, a control valve, 11, an exhaust pipe, 12, a filling cover, 13 and a urea filling pipe.
Detailed Description
While the embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings are exemplary only, and it should be understood that the specific embodiments described herein are merely illustrative of, and do not delimit, the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "vertical", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the invention.
A control valve of a filling and storage system for preventing leakage of a urea tank is shown in figures 1-3 and comprises a top cover 1, a spring 2, a valve seat 3, a valve barrel 6, a limiting rod 5, a connecting rod ball 4, a limiting rod 5 and a valve barrel 6; the inner wall of the upper part of the valve barrel 6 is provided with a mounting groove, the valve seat 3 is placed on the inner wall, the upper part of the valve seat 3 is provided with a first groove, the first groove is used for placing the spring 2 and applying downward elastic force to the valve seat 3, and the valve seat 3 is ensured to be in close contact with the mounting groove under the influence of other external force; the lower part of the valve seat 3 is provided with a second groove in a circular truncated cone shape, and the second groove is communicated with the first groove; the upper end of the spring 2 is abutted against the top cover 1, the top cover 1 is fixedly connected with the valve barrel 6, and a vent hole 101 for balancing air pressure in the valve barrel 6 is formed; a connecting rod ball 4 is accommodated in the valve barrel 6, and the connecting rod ball 4 comprises a connecting rod 402, an upper ball body 401 and a floating body which are arranged at two ends of the connecting rod 402; the upper sphere 401 may be tangent to the side of the second groove; a limiting hole 602 is formed in the middle of the valve barrel 6 and used for enabling the limiting rod 5 to penetrate through the valve barrel 6, so that the upper ball 401 is located between the limiting rod 5 and the second groove; the side of the valve barrel 6 is provided with an air inlet 601 positioned below the limiting hole 602.
Specifically, the valve barrel 6 may be cylindrical, the spring 2 may be an annular spring, and the float may be a sphere.
When urea is added into the urea barrel, the connecting rod ball 4 rises due to buoyancy, the upper ball body 401 is enabled to be continuously close to the second groove, when the urea barrel is filled with urea, the upper ball body 401 can be tangent to the side face of the second groove, a channel between the second groove and the first groove is further sealed, an air inlet channel and an air exhaust channel of the valve barrel 6 are closed, at the moment, due to the fact that the liquid level of the urea rises, air pressure also rises, the urea cannot be added continuously, and the vehicle owner is prevented from being excessively filled. In addition, because connecting rod ball 4 has certain length, can guarantee that the liquid level has certain distance with disk seat 3, when can effectually reducing the urea case and rock, the problem that urea revealed through the air vent 101 of upper portion top cap 1 takes place.
Specifically, in the above control valve, the bottom surface of the top cover 1 is further provided with a cross bar 102 that restricts the movement of the spring 2.
Specifically, in the control valve described above, the top cover 1 and the valve barrel 6 are snap-connected.
Specifically, 2 limiting rods 5 are arranged, the distance between the limiting rods is smaller than the diameter of the upper ball 401, the lowest position of the connecting rod ball 4 can be limited, and the connecting rod ball 4 is guaranteed to be always kept vertical inside the valve barrel 6 under the action of gravity. Meanwhile, the position of the connecting rod ball 4 in a free state can be controlled, and the connecting rod ball 4 is prevented from sliding from the bottom of the valve barrel 6.
Specifically, because disk seat 3 position sets up the upper end at valve barrel 6, consequently, disk seat 3 can not lead to the jamming of disk seat 3 because of the mounting groove of urea crystallization infiltration valve barrel 6, because spring 2 installs in the mounting groove of disk seat 3, can prevent that spring 2 from contacting valve barrel 6, avoided spring 2 to receive the influence of valve barrel 6 and lead to the jamming, can't exert the effort to disk seat 3, simultaneously because the biggest internal diameter of the second recess of disk seat 3 is less than the internal diameter of the mounting groove of valve barrel 6, consequently, even when having liquid to flow down on the second recess of disk seat 3, also can not directly flow in the mounting groove of valve barrel 6, avoid the urea crystallization to pile up in the mounting groove of valve barrel 6, the leakproofness of the mounting groove of valve barrel 6 with valve seat 3 has been guaranteed.
When a vehicle owner fills urea into the vehicle, as shown in fig. 4-7, the vehicle owner opens the filling cover 12, urea 7 is filled into the filling pipe, the urea 7 enters the urea tank through the urea filling pipe 13, and the liquid level in the urea tank 8 gradually rises. When the urea level is over a certain height of the control valve installed in the present invention (as shown by h in fig. 5) 1 The height of the urea liquid level from the bottom of the valve barrel 6 to the moment), when the urea solution generates buoyancy to the connecting rod ball 4 primarily, the connecting rod ball 4 moves upwards to abut against the valve seat 3 under the buoyancy action of the liquid, the second groove of the valve seat 3 is attached to the upper ball 401, and the exhaust passage in the center of the valve seat 3 is closed.
When the urea level rises to a higher level (second level h), as shown in fig. 6 2 ) At this time, since the lower end of the opening of the exhaust pipe 11 of the urea tank 8 is just submerged and the urea tank 8 has no other exhaust passage, the pressure in the urea tank 8 rises with the rise of the urea liquid level in the urea tank 8, the urea liquid level does not rise any more, and the urea 7 cannot rise any moreAnd (3) continuously entering the urea box 8, continuously filling the urea 7 at the moment, increasing the urea 7 in the urea filling pipe 13 until the opening part of the urea filling pipe 13 is about to overflow, judging that the urea is filled to the target amount by the vehicle owner at the moment, not filling the urea any more, and covering the filling cover 12.
When the environmental temperature of the urea box is low, as shown in fig. 7, when the vehicle owner puts the vehicle out of the vehicle and stops the vehicle in place, the air temperature suddenly drops until the urea 7 freezes, the volume of the urea 7 increases due to the freezing of the urea 7, the liquid level rises, the internal air pressure of the urea box 8 rises to exceed X Kpa due to the fact that the urea cannot be exhausted, the air inlet 601 is arranged in the middle of the valve barrel 6 and is higher than the liquid level of the frozen urea 7, the urea 7 cannot be submerged by the rising liquid level of the frozen urea 7, compressed air can push the valve seat 3 through the air inlet 601 to exhaust, and the internal air pressure of the urea box 8 cannot exceed X Kpa (XKpa represents the critical pressure of the urea box 8, which can offset the downward acting force applied to the valve seat 3 by the spring 2), so that the problems of excessive filling and urea 7 and the expansion or obvious deformation of the urea box 8 due to the incapability of exhausting after freezing cannot occur after the control valve is installed on the vehicle urea box 8. When the urea 7 is not in a frozen state, the urea 7 is consumed in the driving process, negative pressure is in the urea box 8, when the difference between the buoyancy force applied to the connecting rod ball 4 by the urea 7 and the gravity force of the connecting rod ball 4 is smaller than the acting force applied to the connecting rod ball 4 by the negative pressure, the connecting rod ball 4 is pushed downwards, air inlet of the urea box 8 is realized, the air pressure is balanced, and the negative pressure in the urea box 8 cannot exceed Y Kpa (Y Kpa is the urea liquid level from the first height h to the second height h) 1 Rises to a second height h 2 Pressure against the valve seat 3 caused by the force exerted by the connecting rod ball 4 on the valve seat 3).
In the driving process: after the urea tank is used, excessive filling cannot occur in the urea tank 8, the liquid level of the urea always has a larger height difference from the contact surface of the connecting rod ball 4 and the valve seat 3, and the third height h 3 The opening of the connecting rod ball 4 is also provided with a height difference h from the contact surface of the connecting rod ball 4 and the valve seat 3 4 And liquid can be effectively prevented from reaching the contact surface of the connecting rod ball 4 and the valve seat 3 when the liquid level fluctuates, and the problem of leakage of urea 7 in the urea box 8 in the driving process is solved.
When the liquid surface is not, as shown in FIGS. 6, 7 and 8When the connecting rod ball 4 is contacted, the connecting rod ball 4 is not contacted with the valve seat 3, and at the moment, gas can freely enter and exit through a gap between the upper ball body 401 of the connecting rod ball 4 and the second groove of the valve seat 3 (the gas can freely enter and exit the urea box 8 through the flow control limiting valve). When the urea liquid level is submerged to the first height h of the invention 1 When the valve seat is opened, the connecting rod ball 4 is floated to a certain height, the connecting rod ball 4 upwards supports against the valve seat 3, and the air inlet channel and the air outlet channel in the center of the valve seat 3 are blocked. When the urea liquid level is submerged to a second height h 2 While the connecting rod ball 4 exerts a force F on the valve seat 3 1 (buoyancy force to which the connecting rod ball 4 is subjected minus its own weight) is smaller than the downward force F of the valve seat 3 2 (the self gravity adds the pressing force of the spring 2), at this time, the air inlet and outlet channels of the invention are still blocked. When the urea liquid level is at the second height h 2 In the process, if the temperature suddenly drops, the urea 7 freezes, and the urea liquid level rises to the third height h because the volume of the frozen urea 7 is increased 3 Third height h 3 The height of the air inlet 601 on the valve barrel 6 cannot be exceeded, the connecting rod ball 4 is partially frozen due to the freezing of the urea 7, the connecting rod ball 4 cannot rise further, the air is compressed due to the freezing volume increase of the urea 7, only the pressure in the urea box 8 is further compressed by the spring 2 behind the valve seat 3 when the pressure exceeds X Kpa, then the pressure in the urea box 8 is released, and the pressure in the urea box 8 cannot exceed X Kpa.
As shown in figure 8, the invention is fixed on the urea box 8, the top cover 1 is partially leaked and is transferred by the elbow 9, and foreign matters are prevented from directly entering the urea box 8 through the vent hole 101 of the top cover 1. The fixing mode comprises the steps that a threaded connector is arranged on the urea box, threads are arranged on the outer wall of the valve barrel 6, and the valve barrel is fixed on the urea box in a threaded mode.
As shown in figure 9, the invention also provides an installation mode that the sealing ring and the clamping claw are fixed on the urea box 8, a hole is formed in the upper part of the urea box 8, the sealing ring is fixed at the upper end of the outer wall of the valve barrel 6 of the invention, the clamping claw is fixed below the sealing ring, so that the invention is installed on the urea box 8, the sealing ring ensures that the invention is fixed on the urea box 8, the urea box 8 is prevented from being directly ventilated with the outside to leak urea 7, foreign matters are prevented from entering the urea box 8, the clamping claw on the outer wall of the valve barrel 6 is mutually meshed with the inner wall of the urea box 8, and the invention is fixed on the urea box 8 to prevent the invention from moving.
In conclusion, the urea tank can prevent urea from being excessively added into the urea tank, the problem of excessive filling is avoided from a design source, the liquid level of the urea can be prevented from shaking and leaking out of the urea tank in the running process of a vehicle, the pressure in the urea tank can be timely released, the problem of deformation of the urea tank caused by pressure change in the urea tank due to freezing of the urea is effectively solved, the pressure difference between the urea tank and the outside can be balanced when urea crystals expand due to sudden temperature drop, and the integrity of the urea tank is ensured.
It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A control valve for preventing leakage of a urea box is characterized by comprising a hollow valve barrel (6), a valve seat (3), a spring (2), a top cover (1), a connecting rod ball (4) and a limiting rod (5);
the inner wall of the upper part of the valve barrel (6) is provided with a mounting groove, the valve seat (3) is placed on the mounting groove, the upper part of the valve seat (3) is provided with a first groove used for placing the spring (2), the lower part of the valve seat (3) is provided with a second groove in a circular truncated cone shape, and the second groove is communicated with the first groove; the upper end of the spring (2) is abutted against the top cover (1), and the top cover (1) is fixedly connected with the valve barrel (6) and is provided with a vent hole (101);
the connecting rod ball (4) is accommodated in the valve barrel (6), and the connecting rod ball (4) comprises a connecting rod (402), an upper ball body (401) and a floating body, wherein the upper ball body and the floating body are arranged at two ends of the connecting rod (402); the upper sphere (401) may be tangent to a side of the second groove;
the middle part of the valve barrel (6) is provided with a limiting hole (602) for the limiting rod (5) to cross the valve barrel (6), so that the upper ball body (401) is positioned between the limiting rod (5) and the second groove;
and the side surface of the valve barrel (6) is provided with an air inlet (601) positioned below the limiting hole (602).
2. A control valve for preventing leakage from a urea tank as claimed in claim 1, characterized in that the bottom surface of the top cover (1) is provided with a cross bar (102) limiting the movement of the spring (2).
3. The control valve for preventing leakage of a urea tank as set forth in claim 1, wherein a maximum inner diameter of said second groove is smaller than an inner diameter of said mounting groove.
4. The control valve for preventing the liquid leakage of the urea tank as claimed in claim 1, wherein the number of the limiting rods (5) and the limiting holes (602) is 2 respectively, and the distance between 2 limiting rods (5) is smaller than the diameter of the upper sphere (401).
5. The control valve for preventing leakage of urea tank as claimed in claim 1, wherein said top cover (1) is snap-fitted to said valve barrel (6).
6. Urea tank, characterized in that, includes urea tank body (8) and control valve (10) of any one of claims 1 to 5, control valve (10) through threaded connection, or through sealing washer with grab cooperation install on urea tank body (8), top cap (1) is located urea tank body (8) outside, the rest of control valve (10) then stretches into inside urea tank body (8).
7. Urea tank according to claim 6, characterized in that it also comprises an elbow (9) connected to the venting hole (101).
8. A urea tank according to claim 6, characterized by further comprising a urea filling pipe (13) for filling urea inside said tank body (8), and an exhaust pipe (11); one end of the exhaust pipe (11) is located inside the urea box body (8) and is equal to the distance that the control valve (10) stretches into the urea box body (8), and the other end of the exhaust pipe is communicated with the urea filling pipe (13).
9. Urea tank according to claim 8, characterized in that it also comprises a filling lid (12) for closing the urea filling pipe (13).
10. Urea tank according to claim 6, characterized in that the control valve (10) is connected with a threaded interface on the urea tank body by means of threads on the outer wall of the valve barrel (6).
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CN202210814120.XA CN115324692A (en) | 2022-07-12 | 2022-07-12 | Control valve for preventing leakage of urea box and urea box |
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CN208831076U (en) * | 2018-07-24 | 2019-05-07 | 东莞正扬电子机械有限公司 | A kind of anti-spilled type urea box filling limit valve |
CN209976603U (en) * | 2019-04-03 | 2020-01-21 | 东莞正扬电子机械有限公司 | Ventilation valve for urea box |
CN216407806U (en) * | 2021-03-31 | 2022-04-29 | 厦门大白科技有限公司 | Prevent frostbite and split constant temperature case |
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TW200607950A (en) * | 2004-08-31 | 2006-03-01 | Huei-Tarng Liou | Gas injection device |
CN102095000A (en) * | 2010-12-22 | 2011-06-15 | 东莞正扬电子机械有限公司 | Automatic type air valve of urea box |
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Application publication date: 20221111 |