CN208718761U - A kind of low-temperature pressure controller for urea pump - Google Patents
A kind of low-temperature pressure controller for urea pump Download PDFInfo
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- CN208718761U CN208718761U CN201821228418.8U CN201821228418U CN208718761U CN 208718761 U CN208718761 U CN 208718761U CN 201821228418 U CN201821228418 U CN 201821228418U CN 208718761 U CN208718761 U CN 208718761U
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- pump
- pressure controller
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- urea
- compressive deformation
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Abstract
The utility model discloses a kind of low-temperature pressure controllers for urea pump, it includes the controller ontology being installed on urea pump, the bottom outlet being connected with pump housing hydraulic cavities is provided on the controller ontology, wherein, for bearing the compressive deformation component for the stress that urea freezing and expansion generates in pump housing hydraulic cavities, one end of the compressive deformation component is protruded into the pump housing hydraulic cavities for insertion in the bottom outlet.The above-mentioned low-temperature pressure controller for urea pump has additional compressive deformation component on the basis of original pressure controller, when low temperature environment and metering air pump inoperative, if the liquid in hydraulic cavities remains in pipeline, icing will be solidified, volume expansion, it forces compressive deformation component compresses to deform, bears the stress that liquid freezing and expansion generates.It is not only simple in structure, it is easy to accomplish；And it is at low cost, the elastic element in pressure controller is avoided by stress rupture, ensure that the reliable and stable work of pressure controller.
Description
Technical field
The utility model relates to a kind of pressure controllers, control more particularly, to a kind of low-temperature pressure for urea pump
Device.
Background technique
Refer to for selective catalytic conversion system of diesel engine SCR (SelectiveCatalystReduction) and is mounted on
In diesel engine automobile air exhausting system, the NOx in diesel emission is catalysed and reduced into N2And O2Catalytic reduction device, select urea
Aqueous solution is as reducing agent.Aqueous solution of urea is ejected into the exhaust pipe of catalyst upstream, in the effect of exhaust gas temperature and air-flow
Lower hydrolysis is produced as CO2And NOx is reduced into free of contamination nitrogen and water as reducing agent by ammonia, ammonia.
Urea liquid supply pump is essential important component in SCR system, currently, existing for SCR system
Urea liquid supply pump (abbreviation metering pump), operating temperature is in -40 DEG C~85 DEG C, in the actual use process, urea liquid
For supply pump in low temperature environment (being lower than -11 DEG C) work, urea liquid supply pump will appear failure, the reason is that due to pump hydraulic pressure chamber
Interior icing of urea solution, volume expansion (expansion rate about 9%), damages the pressure controller inside metering pump, so as to cause meter
Amount pump breaks down.
Utility model content
The purpose of this utility model is to provide a kind of low-temperature pressure controllers for urea pump, to solve the prior art
The problem of urea liquid supply pump easily causes stress controller damage because of urea freezing and expansion in low temperature.
For this purpose, the utility model uses following technical scheme:
A kind of low-temperature pressure controller for urea pump comprising the controller ontology being installed on urea pump, it is described
The bottom outlet being connected with pump housing hydraulic cavities is provided on controller ontology, wherein insertion is for bearing pump housing liquid in the bottom outlet
The compressive deformation component for the stress for pressing intracavitary urea freezing and expansion to generate, the pump housing is protruded into one end of the compressive deformation component
In hydraulic cavities.
Particularly, stainless steel diaphragm, the positive and negative spring control of the stainless steel diaphragm are provided in the controller ontology
The on-off of circuit in pressure controller.
Particularly, the compressive deformation component uses strip structure, if outer wall offers arterial highway along its length
Groove.
Particularly, the compressive deformation component is ethylene propylene diene rubber foaming item.
Particularly, the bottom of the controller ontology is provided with mounting base, and the bottom outlet is opened in the mounting base, institute
It states and is sealed by a seal ring between mounting base and urea pump.
The beneficial effects of the utility model are that the low-temperature pressure controller for urea pump exists compared with prior art
Compressive deformation component is had additional on the basis of original pressure controller, when low temperature environment (< -11 DEG C), when measuring air pump inoperative,
The intracavitary liquid of metering pump internal hydraulic pressure (aqueous solution) will solidify icing if remained in pipeline, and volume expansion forces pressure
The stress that liquid freezing and expansion generates is born in the deformation of compression deformation component compresses.It is not only simple in structure, it is easy to accomplish；And cost
It is low, the elastic element in pressure controller is avoided by stress rupture, ensure that the reliable and stable work of pressure controller.
Detailed description of the invention
Fig. 1 is the stereochemical structure for the low-temperature pressure controller for urea pump that specific embodiment of the present invention provides
Schematic diagram；
Fig. 2 is the installation signal for the low-temperature pressure controller for urea pump that specific embodiment of the present invention provides
Figure.
Specific embodiment
Further illustrate the technical solution of the utility model below with reference to the accompanying drawings and specific embodiments.
It please refers to shown in Fig. 1 and Fig. 2, in the present embodiment, a kind of low-temperature pressure controller for urea pump includes installation
In the controller ontology 2 on urea pump 1, controller ontology 2 includes nylon outer shell 20 and is set to stainless in nylon outer shell 20
Steel diaphragm 21, the top of nylon outer shell 20 are provided with contact pin 22, and bottom end is provided with mounting base 23, offers bottom outlet in mounting base 23
24, pressure controller is using the on-off of circuit in the positive and negative spring control pressure controller of stainless steel diaphragm 21, and diaphragm is using resistance to
Low temperature, corrosion resistant stainless steel material are made, and bear maximum pressure and reach 10bar or more.
Controller ontology 2 is installed on urea pump 1 by mounting base 23, passes through sealing between mounting base 23 and urea pump 1
Circle 3 is sealed, and the bottom end of bottom outlet 24 is connected with the pump housing hydraulic cavities 10 of urea pump 1, top be equipped with stainless steel diaphragm
21 cavity is connected, and ethylene propylene diene rubber foaming item 4 is inserted into bottom outlet 24, the outer wall of ethylene propylene diene rubber foaming item 4 is along it
If length direction is evenly arranged with arterial highway arc groove 40, the bottom end of ethylene propylene diene rubber foaming item 4 stretches out bottom outlet 24 and is located at pump
In body hydraulic cavities 10, i.e., ethylene propylene diene rubber foaming item 4 has certain stretching surplus relative to bottom outlet 24.
When urea pump 1 works normally, ethylene propylene diene rubber foaming item 4 is on 1 performance of metering pump substantially without influence；When
Low temperature environment (< -11 DEG C), when metering pump 1 does not work, liquid (aqueous solution) in metering pump internal pump body hydraulic cavities 10 if
Remain in pipeline, icing will be solidified, volume expansion forces 4 compressive deformation of ethylene propylene diene rubber foaming item, bears liquid
The stress that body freezing and expansion generates, especially ethylene propylene diene rubber foaming item 4 can bear axis relative to the stretching surplus of bottom outlet 24
To stress and radial stress.Ethylene propylene diene rubber foaming item 4 carries most stress of liquid freezing and expansion generation, thus
The elastic element in pressure controller is avoided by stress rupture, ensure that pressure controller functionality.
Above embodiments only elaborate the basic principles and features of the present invention, and the utility model is not by above-mentioned example
Limitation, on the premise of not departing from the spirit and scope of the utility model, the present invention has various changes and changes, these changes
Change and change is fallen within the scope of the claimed invention.The utility model requires protection scope is wanted by appended right
Ask book and its equivalent thereof.
Claims (5)
1. a kind of low-temperature pressure controller for urea pump comprising the controller ontology being installed on urea pump, the control
The bottom outlet being connected with pump housing hydraulic cavities is provided on device ontology processed, which is characterized in that insertion is for bearing pump in the bottom outlet
The compressive deformation component for the stress that the hydraulic intracavitary urea freezing and expansion of body generates, one end of the compressive deformation component is protruded into described
In pump housing hydraulic cavities.
2. the low-temperature pressure controller according to claim 1 for urea pump, which is characterized in that the controller ontology
It is inside provided with stainless steel diaphragm, the on-off of circuit in the positive and negative spring control pressure controller of the stainless steel diaphragm.
3. the low-temperature pressure controller according to claim 1 for urea pump, which is characterized in that the compressive deformation portion
Part uses strip structure, if outer wall offers arterial highway groove along its length.
4. the low-temperature pressure controller according to claim 3 for urea pump, which is characterized in that the compressive deformation portion
Part is ethylene propylene diene rubber foaming item.
5. the low-temperature pressure controller according to claim 1 for urea pump, which is characterized in that the controller ontology
Bottom be provided with mounting base, the bottom outlet is opened in the mounting base, passes through sealing between the mounting base and urea pump
Circle is sealed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821228418.8U CN208718761U (en) | 2018-08-01 | 2018-08-01 | A kind of low-temperature pressure controller for urea pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821228418.8U CN208718761U (en) | 2018-08-01 | 2018-08-01 | A kind of low-temperature pressure controller for urea pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208718761U true CN208718761U (en) | 2019-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821228418.8U Active CN208718761U (en) | 2018-08-01 | 2018-08-01 | A kind of low-temperature pressure controller for urea pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108825338A (en) * | 2018-08-01 | 2018-11-16 | 凯龙高科技股份有限公司 | A kind of low-temperature pressure controller for urea pump |
-
2018
- 2018-08-01 CN CN201821228418.8U patent/CN208718761U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108825338A (en) * | 2018-08-01 | 2018-11-16 | 凯龙高科技股份有限公司 | A kind of low-temperature pressure controller for urea pump |
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