CN104675485A - Flow passage-switching structure for urea pumps - Google Patents
Flow passage-switching structure for urea pumps Download PDFInfo
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- CN104675485A CN104675485A CN201510092530.8A CN201510092530A CN104675485A CN 104675485 A CN104675485 A CN 104675485A CN 201510092530 A CN201510092530 A CN 201510092530A CN 104675485 A CN104675485 A CN 104675485A
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Abstract
The invention discloses a flow passage-switching structure for urea pumps, which comprises a flow passage system, a switching driving mechanism and a pump, a urea container is connected with a first flow passage and a second flow passage, a nozzle is connected with a third flow passage and a fourth flow passage, the switching driving mechanism comprises a low-pressure switching valve and a high-pressure switching valve, the low-pressure switching valve is provided with two valves which can be switched to open and close by means of the rotation of rotary shafts, moreover, the first flow passage and the third flow passage are respectively connected to the two valves of the low-pressure switching valve, the high-pressure switching valve is provided with two valves which can be switched to open and close by means of the rotation of rotary shafts, and furthermore, the second flow passage and the fourth flow passage are respectively connected to the two valves of the high-pressure switching valve; the pump always communicates with the low-pressure switching valve through a suction inlet; the pump always communicates with the high-pressure switching valve through a discharge outlet; by means of the rotation of the rotary shafts of the low-pressure switching valve and the high-pressure switching valve, the aqueous urea solution spray passage is opened, while the aqueous urea solution recovery passage is closed; or the aqueous urea solution recovery passage is opened, while the aqueous urea solution spray passage is closed.
Description
Technical field
The invention belongs to field of mechanical technique, be specifically related to a kind of stream switching construction of urea pump.
Background technique
Urea diaphragm pump is a kind of one-way pump, is aqueous solution of urea pressurization is supplied to waste gas cleaning plant urea pump unit, is that reducing agent purifies NOx with aqueous solution of urea.Himself cannot realize the commutation of urea liquid.Although mass concentration be 32.5% aqueous solution of urea freezing temperature very low, also can freeze below-11 DEG C formed crystallization, easily make line clogging.
Therefore, when vehicle uses, in order to avoid aqueous solution of urea supply pipe arrangement, aqueous solution of urea injection nozzle etc. due to aqueous solution of urea freeze to cause damage or action malfunctioning, be necessary aqueous solution of urea to be reclaimed when parking etc. not use when urea injection system.Avoid the urea blocking pipe of crystallization, affect urea-spray.
In prior art, in order to make the stream of urea compression pump reverse, setting up complicated mechanism, having improve cost.In order to solve above-mentioned technical problem, the present invention comes therefrom.
Summary of the invention
The present invention is the technical problem in order to suck back aqueous solution of urea unnecessary in urea compression pump, the flow channel switching valve settled in described compression pump.
In order to solve above-mentioned technical problem, technological scheme provided by the invention is: the stream switching construction of urea pump, and its feature is, it comprises flow path system, switching-driving device and pump,
Be connected with first flow path and the second stream from urea container, be connected with the 3rd stream and the 4th stream from nozzle,
Described switching-driving device comprises low pressure switching valve and high pressure switching valve,
Described low pressure switching valve has the valve that two rotations by running shaft can switch opening and closing, and described first flow path and the 3rd stream are connected respectively to two valves of this low pressure switching valve,
Described high pressure switching valve has the valve that two rotations by running shaft can switch opening and closing, and the second described stream and the 4th stream are connected respectively to two valves of this high pressure switching valve;
Described pump is communicated with low pressure switching valve all the time by suction port; Described pump is communicated with high pressure switching valve all the time by exhaust port;
And pass through the rotation of the running shaft of low pressure switching valve and high pressure switching valve, make aqueous solution of urea spray path and open, and aqueous solution of urea recovery passage is closed; Or aqueous solution of urea recovery passage is opened, and aqueous solution of urea ejection path blockade.
In of the present invention one preferred technological scheme, described low pressure switching valve is connected to electric rotating magnet valve to control the rotation of its running shaft, makes the switching of two valve generation opening and closings of low pressure switching valve; Described high pressure switching valve is connected to electric rotating magnet valve to control the rotation of its running shaft, makes the switching of two valve generation opening and closings of high pressure switching valve.
In of the present invention one preferred technological scheme, the discharge tube diameter of the exhaust port of pump is a bit larger tham the diameter of the mouth of pipe of its suction port.
In of the present invention one preferred technological scheme, described low pressure switching valve and high pressure switching valve are self-seal type.
In of the present invention one preferred technological scheme, described switching-driving device loads the head of diaphragm pump.
A second aspect of the present invention provides a kind of diaphragm pump, and its feature is, is provided with the stream switching construction of urea pump as the aforementioned in its head.
The advantage of the stream switching construction of urea pump of the present invention comprises as follows: (1) just can make liquid stream commutate as long as make switching valve rotate;
(2) stream is assembled in switching valve valve body, simple and compact for structure; The head of diaphragm pump loads switching valve, compact structure, and cost is low;
(3) switching valve is self-seal type, and sealability is excellent, and the solenoid valve simultaneously commutated can guarantee sealing, therefore maintains electric current little or do not need.
Accompanying drawing explanation
Fig. 1 is the general illustration of the stream switching construction of urea pump of the present invention.
Fig. 2 be urea pump stream switching construction spray aqueous solution of urea time stream and switching-driving device view.
Fig. 3 be urea pump stream switching construction reclaim unnecessary aqueous solution of urea time stream and switching-driving device view.
Wherein 1 is urea container, and 11 is first flow path, and 12 is the second stream, 2 is nozzle, and 21 is the 3rd stream, and 22 is the 4th stream, 3 is pump, and 31 is suction port, and 32 is exhaust port, 4 is electric rotating magnet valve, and 51 is low pressure switching valve, and 52 is high pressure switching valve, 61,62 is switch valve, and 71 is running shaft, and 72 is running shaft.
Embodiment
Below in conjunction with specific embodiment, such scheme is described further.Should be understood that these embodiments are not used in for illustration of the present invention to limit the scope of the invention.The implementation condition adopted in embodiment can do further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in normal experiment.
The embodiment of the stream switching construction of a kind of urea pump as shown in Figure 1, Figure 2, Figure 3 shows, it comprises switching-driving device and pump 3, and switching-driving device comprises low pressure switching valve 51 and high pressure switching valve 52; Pump 3 is positioned at outside housing, and pump 3 connects low pressure switching valve 51 by suction port 31, and described pump 3 connects high pressure switching valve 52 by exhaust port 32; Described low pressure switching valve 51 has the valve 61 that two rotations by running shaft 71 can switch opening and closing mutually, first flow path 11 and the second stream 12 is connected with from urea container 1, be connected with the 3rd stream 21 and the 4th stream 22 from nozzle 2, described first flow path 11 and the 3rd stream 21 are connected respectively to two valves 61 of this low pressure switching valve 51; Described high pressure switching valve 52 has the valve that two rotations by running shaft 72 can switch opening and closing mutually, and the second described stream 12 and the 4th stream 22 are connected respectively to two valves 6 of this high pressure switching valve 52; In this preferred embodiment, low pressure switching valve 51 and high pressure switching valve 52 are connected to electric rotating magnet valve 4 to control its running shaft 71, the rotation of 72, makes two valves 61 of low pressure switching valve exchange two valves 62 switching opening and closing and high pressure switching valve and exchanges switching opening and closing.
In a preferred embodiment of the present invention, the discharge tube diameter of the exhaust port 32 of pump 3 is a bit larger tham the nozzle diameter of its suction port 31.
In a preferred embodiment of the present invention, described low pressure switching valve 51 and high pressure switching valve 52 are self-seal type.
Working principle and the process of the stream switching construction of urea pump of the present invention are:
In order to carry out the recovery of aqueous solution of urea in the path of solution of supplying urea to nozzle, in diaphragm pump, switching-driving device is set, the exhaust port 32 of pump 3 is connected to nozzle 2 side, suction port 31 is connected to urea container 1 side, during switching valve action, the exhaust port 32 of pump 3 is connected to urea container 1 by stream, and the suction port 31 of pump 3 is connected to nozzle side.Switching-driving device of the present invention is connected with 4 streams, and 2 use when usual condition, and all the other 2 use when sucking back aqueous solution of urea from nozzle etc.Switching valve is arranged on an axle, by making axle rotate an angle, can open 2 stream mouths when usually using, and make aqueous solution of urea spray path and open, and aqueous solution of urea recovery passage is closed; Or when making running shaft counter-rotating one angle, open 2 streams sucked back, then aqueous solution of urea recovery passage is opened, and aqueous solution of urea ejection path blockade.
Be arranged at above-mentioned 4 fluid passages in switching-driving device, from 1 group of discharge duct that urea container 1 connects, be communicated with another suction passage be connected from nozzle 2 by pump 3, equally, connect one group of suction passage from urea container 1, the discharge duct be connected with from nozzle by pump 3 is communicated with.Therefore, need not, at the other path of outer installment, as long as make switching valve rotate, liquid stream just can be made to commutate.And when using any 2 paths, by making pump discharge side diameter slightly large.
During usual condition as the display in Fig. 2, aqueous solution of urea ejection path is opened, and aqueous solution of urea recovery passage is closed, and is connected with first flow path 11 and the second stream 12, is connected with the 3rd stream 21 and the 4th stream 22 from nozzle 2 from urea container 1; First flow path 11 and the 3rd stream 21 are connected respectively to two valves 61 of low pressure switching valve 51, and low pressure switching valve can switch the opening and closing of two valves by the rotation of running shaft; Second stream 12 and the 4th stream 22 are connected respectively to two valves 62 of this high pressure switching valve 52, and high pressure switching valve can switch the opening and closing of two valves by the rotation of running shaft; The suction port 31 of pump 3 is communicated with low pressure switching valve all the time; The exhaust port 32 of pump 3 is communicated with high pressure switching valve all the time;
When usual condition, make aqueous solution of urea spray path to open, and aqueous solution of urea recovery passage is closed, namely urea from urea container by first flow path 11 through low pressure switching valve 51, by suction port 31, flow through pump 3, then through exhaust port 32 by high pressure switching valve 52, be left to nozzle 2 through the 4th stream 22.
When to park etc. do not use when urea injection system, aqueous solution of urea is reclaimed time, as shown in Figure 3, by the rotation of the running shaft of low pressure switching valve and high pressure switching valve, aqueous solution of urea recovery passage is opened, and aqueous solution of urea ejection path blockade: unnecessary urea liquid is from the 3rd stream 21 via low pressure switching valve 51, and suction port 31, flows through pump 3, pass through high pressure switching valve 52 through exhaust port 32 again, flow back in urea container 1 through the second stream 12.
The invention provides a kind of selective reduction NOx purification plant (SCR) spraying aqueous solution of urea and as reducing agent, NOx is purified, consider the situation that aqueous solution of urea freezes, be arranged on reclaimed the aqueous solution of urea that is filled in runner when not using simple, cheap and flow channel switching valve reliably.
Above-mentioned example, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations of doing according to Spirit Essence of the present invention or modification, all should be encompassed within protection scope of the present invention.
Claims (6)
1. the stream switching construction of urea pump, it is characterized in that, it comprises flow path system, switching-driving device and pump,
Be connected with first flow path and the second stream from urea container, be connected with the 3rd stream and the 4th stream from nozzle,
Described switching-driving device comprises low pressure switching valve and high pressure switching valve,
Described low pressure switching valve has the valve that two rotations by running shaft can switch opening and closing, and described first flow path and the 3rd stream are connected respectively to two valves of this low pressure switching valve,
Described high pressure switching valve has the valve that two rotations by running shaft can switch opening and closing, and the second described stream and the 4th stream are connected respectively to two valves of this high pressure switching valve;
Described pump is communicated with low pressure switching valve all the time by suction port; Described pump is communicated with high pressure switching valve all the time by exhaust port;
And pass through the rotation of the running shaft of low pressure switching valve and high pressure switching valve, make aqueous solution of urea spray path and open, and aqueous solution of urea recovery passage is closed; Or aqueous solution of urea recovery passage is opened, and aqueous solution of urea ejection path blockade.
2. the stream switching construction of urea pump according to claim 1, is characterized in that, described low pressure switching valve is connected to electric rotating magnet valve to control the rotation of its running shaft, makes the switching of two valve generation opening and closings of low pressure switching valve; Described high pressure switching valve is connected to electric rotating magnet valve to control the rotation of its running shaft, makes the switching of two valve generation opening and closings of high pressure switching valve.
3. the stream switching construction of urea pump according to claim 1, is characterized in that, the discharge tube diameter of the exhaust port of pump is a bit larger tham the diameter of the mouth of pipe of its suction port.
4. the stream switching construction of urea pump according to claim 1, is characterized in that, described low pressure switching valve and high pressure switching valve are self-seal type.
5. the stream switching construction of urea pump according to claim 1, is characterized in that, described switching-driving device loads the head of diaphragm pump.
6. a diaphragm pump, is characterized in that, is provided with the stream switching construction of the urea pump as described in any one of claim 1-5 in its head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510092530.8A CN104675485A (en) | 2015-03-02 | 2015-03-02 | Flow passage-switching structure for urea pumps |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510092530.8A CN104675485A (en) | 2015-03-02 | 2015-03-02 | Flow passage-switching structure for urea pumps |
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| CN104675485A true CN104675485A (en) | 2015-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510092530.8A Pending CN104675485A (en) | 2015-03-02 | 2015-03-02 | Flow passage-switching structure for urea pumps |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021073536A1 (en) * | 2019-10-18 | 2021-04-22 | 上海船用柴油机研究所 | System and method for urea supply and injection for ship |
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| US20080148716A1 (en) * | 2006-12-20 | 2008-06-26 | Aisan Kogyo Kabushiki Kaisha | Exhaust gas purification device of internal combustion engine |
| CN102052513A (en) * | 2009-10-30 | 2011-05-11 | 博世株式会社 | Reducing agent injection valve abnormality detection device and abnormality detection method, and internal combustion engine exhaust gas purification system |
| CN103375612A (en) * | 2012-04-20 | 2013-10-30 | 比尔克特韦尔克有限公司 | Fluid control element |
| CN103946497A (en) * | 2011-11-29 | 2014-07-23 | 日野自动车株式会社 | Injector control method |
| CN204609992U (en) * | 2015-03-02 | 2015-09-02 | 清华大学苏州汽车研究院（吴江） | The stream switching construction of urea pump and install its diaphragm pump |
-
2015
- 2015-03-02 CN CN201510092530.8A patent/CN104675485A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080148716A1 (en) * | 2006-12-20 | 2008-06-26 | Aisan Kogyo Kabushiki Kaisha | Exhaust gas purification device of internal combustion engine |
| CN102052513A (en) * | 2009-10-30 | 2011-05-11 | 博世株式会社 | Reducing agent injection valve abnormality detection device and abnormality detection method, and internal combustion engine exhaust gas purification system |
| CN103946497A (en) * | 2011-11-29 | 2014-07-23 | 日野自动车株式会社 | Injector control method |
| CN103375612A (en) * | 2012-04-20 | 2013-10-30 | 比尔克特韦尔克有限公司 | Fluid control element |
| CN204609992U (en) * | 2015-03-02 | 2015-09-02 | 清华大学苏州汽车研究院（吴江） | The stream switching construction of urea pump and install its diaphragm pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021073536A1 (en) * | 2019-10-18 | 2021-04-22 | 上海船用柴油机研究所 | System and method for urea supply and injection for ship |
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Application publication date: 20150603 |
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