CN113090422A - High-temperature end valve assembly for exhaust gas recirculation - Google Patents
High-temperature end valve assembly for exhaust gas recirculation Download PDFInfo
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- CN113090422A CN113090422A CN202110387394.0A CN202110387394A CN113090422A CN 113090422 A CN113090422 A CN 113090422A CN 202110387394 A CN202110387394 A CN 202110387394A CN 113090422 A CN113090422 A CN 113090422A
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- 239000002184 metal Substances 0.000 claims abstract description 87
- 238000007789 sealing Methods 0.000 claims abstract description 84
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 239000000498 cooling water Substances 0.000 claims abstract description 7
- 238000009423 ventilation Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 5
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 21
- 239000002912 waste gas Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
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- 229910052755 nonmetal Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- 230000008021 deposition Effects 0.000 description 2
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- 238000003825 pressing Methods 0.000 description 2
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- 239000003566 sealing material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
- F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
- F02M26/72—Housings
- F02M26/73—Housings with means for heating or cooling the EGR valve
Abstract
The invention relates to a high temperature end valve assembly for exhaust gas recirculation, comprising: the valve comprises a motor, a valve cover sleeve and a valve body which are sequentially installed, wherein a valve plate and a valve rod driving the valve plate to rotate are arranged in the valve body, the valve rod is connected with a motor shaft through a transmission pair in the valve cover sleeve, and an upper metal sealing sleeve and a lower metal sealing sleeve are arranged at the upper end and the lower end of the valve plate along the valve rod; a ventilation space is arranged between the valve cover sleeve and the valve body, and a cooling water channel and a flow guide ring are arranged in the valve cover sleeve around the valve rod. According to the invention, all-metal sealing is used on the upper side and the lower side of the valve plate, so that the high-temperature performance of the sealing element is improved, the sealing is more stable and reliable, and meanwhile, the deep groove bearing is used for supporting the driving gear and the sector gear, so that the friction of the support is reduced, and the rotation torque of the valve rod is reduced. The EGR valve solves the problems of large power consumption, unstable transmission, short service life and the like of the traditional EGR valve so as to improve the stability and reliability of the EGR system of the medium and heavy vehicle.
Description
Technical Field
The invention relates to a high-temperature end valve assembly for exhaust gas circulation, which is an environment-friendly accessory facility of an automobile engine, and is an EGR valve of the automobile engine, in particular to a medium-heavy automobile engine.
Background
Exhaust gas recirculation systemThe effect of (2) is to send a part of the exhaust gas generated by the diesel engine back to the cylinder, because the recirculated exhaust gas has inertia and does not participate in chemical reaction, the mixed gas entering the cylinder is diluted, the oxygen concentration is reduced, and the heating value of the combustible mixed gas is reduced. In addition, the CO in the waste gas2And the heat capacity of the water vapor is larger, so that the specific heat capacity of the mixed gas is increased, and the peak temperature in the cylinder is reduced. Both of them increase the ignition delay period of the combustion process of the diesel engine, slow the combustion rate and reduce the highest combustion temperature in the cylinder, thus destroying the high-temperature oxygen-enriched condition required by NOx generation and reducing the NOx emission of the diesel engine. The EGR valve controls the adjustment of the flow of the waste gas and the opening and closing of the flow channel when the waste gas enters the cylinder for the second time, and is controlled by the output signal of the engine ECU, and the EGR valve has the self-resetting function when the system fails.
Although the traditional connecting rod type butterfly valve is widely applied to an EGR (exhaust gas recirculation) system of a medium-heavy diesel engine, the connecting rod has limited torque expansion, needs a high-power motor for transmission, is greatly interfered by the outside world, is unstable in transmission, occupies a large installation space, is poor in integration, is particularly used for an EGR valve at a high temperature end, and is easy to damage and influences the whole service life of the valve under a high-temperature working environment due to the fact that a nonmetal elastic element is adopted for sealing. How to improve the working efficiency and reliability of the connecting rod type butterfly valve is a problem to be solved.
Disclosure of Invention
To overcome the problems of the prior art, the present invention proposes a high temperature end valve assembly for exhaust gas recirculation. The high-temperature end valve assembly improves the moment of opening and closing of the valve, improves the reliability of the valve and prolongs the whole service life of the valve by using all-metal sealing and the rolling bearing.
The purpose of the invention is realized as follows: a high temperature end valve assembly for use in circulating exhaust gas comprising: the valve comprises a motor, a valve cover sleeve and a valve body which are sequentially installed, wherein a valve plate and a valve rod driving the valve plate to rotate are arranged in the valve body, the valve rod is connected with a motor shaft through a transmission pair in the valve cover sleeve, and an upper metal sealing sleeve and a lower metal sealing sleeve are arranged at the upper end and the lower end of the valve plate along the valve rod; a ventilation space is arranged between the valve cover sleeve and the valve body, and a cooling water channel and a flow guide ring are arranged in the valve cover sleeve around the valve rod.
Further, the upper metal sealing kit comprises: the lower end metal filter screen, the shaft sleeve, the gasket, the metal sealing ring, the metal sealing gasket, the compression ring and the upper end metal filter screen wrapped in the compression ring are sequentially arranged on the valve body along the valve rod.
Furthermore, the metal sealing ring and the metal sealing gasket are made of austenitic stainless steel.
Furthermore, the outer circular surface of the metal sealing ring is in transition fit with the valve body, and the central hole is in clearance fit with the valve rod.
Furthermore, the upper end metal filter screen and the lower end metal filter screen are annular filter screens wrapped on the outer circular surface of the valve rod.
Furthermore, the shaft sleeve is made of a self-lubricating material.
Further, the transmission pair of the valve cover assembly comprises: the motor comprises a driving gear supported by a deep groove bearing driven by a motor shaft and a sector gear meshed with the driving gear, wherein the sector gear is arranged on a valve rod supported by the deep groove bearing.
Furthermore, the valve cover sleeve is also provided with a return spring.
Furthermore, the flow guide ring in the valve cover sleeve is a stamping part.
Further, the lower metal sealing kit comprises: the end cover, the lower end metal filter screen, the metal sealing gasket, the metal sealing ring, the gasket, the shaft sleeve and the upper end metal filter screen are arranged in sequence.
The invention has the advantages and beneficial effects that: according to the invention, all-metal sealing is used on the upper side and the lower side of the valve plate, so that the high-temperature performance of the sealing element is improved, the sealing is more stable and reliable, and meanwhile, the deep groove bearing is used for supporting the driving gear and the sector gear, so that the friction of the support is reduced, and the rotation torque of the valve rod is reduced. The EGR valve solves the problems of large power consumption, unstable transmission, short service life and the like of the traditional EGR valve so as to improve the stability and reliability of the EGR system of the medium and heavy vehicle.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a schematic structural diagram of a valve assembly according to one, seven or eight embodiments of the present invention;
FIG. 2 is a schematic structural diagram of an upper metal seal assembly according to a second embodiment of the present invention, which is an enlarged view of point A in FIG. 1;
fig. 3 is a schematic structural view of a lower metal sealing sleeve according to a tenth embodiment of the present invention, which is an enlarged view of a point B in fig. 1.
Detailed Description
The first embodiment is as follows:
the present embodiment is a high temperature end valve assembly for use in exhaust gas recirculation, as shown in fig. 1. The embodiment comprises the following steps: the valve comprises a motor 1, a valve cover sleeve 2 and a valve body 3 which are sequentially installed, wherein a valve plate 4 and a valve rod 5 which drives the valve plate to rotate are arranged in the valve body, the valve rod is connected with a motor shaft 102 through a transmission pair 201 in the valve cover sleeve, and an upper metal sealing sleeve 6 and a lower metal sealing sleeve 7 are arranged at the upper end and the lower end of the valve plate along the valve rod; a ventilation space 8 is arranged between the valve cover sleeve and the valve body, and a cooling water channel 202 and a flow guide ring 203 are arranged in the valve cover sleeve around the valve rod.
The "up" and "down" described in this embodiment refer to the assembling position state of the valve assembly shown in fig. 1, and also refer to the mounting position state of the valve assembly described in this embodiment on the engine, that is: the motor and the valve cover sleeve thereof are in the upper half part (called as 'upper'), and the valve plate and the valve seat are in the lower half part (called as 'lower').
The structure described in the embodiment aims at the exhaust gas recirculation working condition that an EGR valve in an exhaust gas recirculation system of a medium-heavy diesel engine vehicle needs to meet 650 ℃ high temperature and 5Bar pressure. The EGR valve is a valve with a rotary valve plate, and the upper seal is the position between the valve plate and the motor and the valve cover. The lower seal below the valve plate is opposite to the upper seal, and the upper and lower two groups of seal structures are matched to prevent hot gas in the valve body from leaking.
The working principle of the valve assembly in the embodiment is as follows: the valve body runner is used for discharging high-temperature waste gas in an engine exhaust manifold into a waste gas channel so as to obtain higher EGR rate, and the valve plate is positioned in the runner of the valve body to realize EGR opening and closing and flow regulation. The valve rod is connected with the valve plate through the taper pin and drives the valve plate to rotate. The valve cover is fastened with the valve body cylindrical pin through a bolt after being positioned, and the cooling water channel is carried by the valve cover cavity.
The gas in the EGR flow path system is itself vented to atmosphere and the seal is primarily used to maintain pressure in the EGR system so that minor leaks do not affect the proper operation of the EGR system. According to the characteristic, the optimized design of the traditional EGR valve in the high-temperature working environment is realized, the full-metal sealing structure is used for replacing the traditional rubber sealing structure, the problem that the traditional nonmetal sealing structure is easy to age at high temperature is solved, and the service life of the EGR valve is prolonged. Because the elastic deformation of the metal sealing element is small, the sealing between the sealing element and the valve rod is difficult to be tight, the air tightness is slightly poorer than that of a nonmetal elastic sealing ring, and the sealing requirement of an EGR system can be completely met.
The upper and lower metal sealing sleeve members can adopt a mode of combining a sealing gasket and a sealing ring, and the support adopts a material with self-lubricating property. In order to filter the particles in the exhaust gas, a metal filter screen can be arranged in the metal sealing sleeve to filter the particles in the exhaust gas, so that the environment is protected.
In order to make the gas of revealing distribute to the atmosphere naturally, the sealed passageway of revealing the air of back has been designed specially to this embodiment, has designed the space of ventilating promptly between valve gap external member and valve body, has avoided the air to silt up the normal work that influences the valve.
In order to solve the influence of the high temperature close to 700 ℃ in the valve body on the valve cover assembly, the cooling water channel and the flow guide ring which are cooled are designed around the valve rod, so that the heat transmitted by the valve rod is rapidly taken away by cooling water when entering the valve cover assembly, and the motor, the electronic element and the transmission pair can work in the normal temperature environment.
The transmission pair described in the embodiment can adopt gear transmission. Because the valve rod only rotates by less than 90 degrees, the driven gear of the transmission pair can be designed as a sector gear so as to save space and manufacturing cost.
In order to reduce the friction resistance of the transmission pair, deep groove bearings can be arranged on a driving gear and a driven gear of the transmission pair, the stress state of the support is improved, and the service life of the motor is prolonged.
In order to enable the valve plate to be in a closed state under the power failure state, a return spring can be arranged on the valve rod. The return spring has various forms, and can be a sheet torsion spring, a cylindrical spiral spring and the like.
Example two:
this embodiment is an improvement of the first embodiment, and is a refinement of the first embodiment regarding the upper metal seal assembly. The upper metal sealing kit of this embodiment includes: a lower end metal filter screen 601, a shaft sleeve 602, a gasket 603, a metal sealing ring 604, a metal sealing gasket 605, a pressing ring 606 and an upper end metal filter screen 607 wrapped in the pressing ring are sequentially arranged on the valve body along the valve rod, as shown in fig. 2.
The upper sealing structure is completely made of metal materials, and the sealing elements are made of metal materials and matched with a metal filter screen, so that the working condition requirements of 650 ℃ high temperature and 5Bar pressure can be met.
The upper sealing structure specifically comprises: the upper edge of the valve plate is provided with a lower end metal filter screen which is used for preventing waste gas particles and carbon deposition from entering a sealing area. The shaft sleeve is arranged on the metal filter screen at the lower end to support the valve rod and the sealing ring. Set up sealed the pad on the sealing ring, play radial seal effect, set up the clamping ring on the sealed pad. The press mounting of the press ring is followed by fixing the whole upper sealing structure, and the inside wrapping of the press ring is provided with a metal filter screen to prevent external dust particles from entering a sealing system, so that the dustproof effect is achieved.
The metal sealing ring is a cylindrical part, the middle through hole can penetrate through the valve rod and form clearance fit with the valve rod, the fit has a relatively large clearance during cooling, and under the thermal environment during working, due to thermal expansion, the cylindrical middle hole can expand and shrink, the diameter of the valve rod expands and expands, the clearance between the valve rod and the middle hole can be relatively reduced, and the sealing effect is achieved.
The metal sealing gasket is a flat disc-shaped (disc-shaped) part, the middle hole is relatively large and is not in contact with the valve rod, but the diameter of the outer circle is tightly matched with the valve body so as to prevent gas in the valve body from leaking along the wall of the valve body hole.
In order to meet the requirements of high-temperature exhaust gas environment, the metal sealing ring and the metal sealing gasket can be made of heat-resistant stainless steel 316, friction torque is not generated on the valve rod after press mounting, and power consumption is reduced.
The upper end and the lower end of the sealing structure are protected by metal filter screens, and waste gas carbon deposition and dust particles are prevented from entering a sealing area.
The shaft sleeve is equivalent to a bearing and is used for supporting and restraining the valve rod to rotate, and a boss can be arranged on the shaft sleeve so as to be convenient to install. The shaft sleeve can be made of a material with self-lubricating property, so that later-stage manual lubrication is omitted, and the cost is saved.
Example three:
this embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the sealing material. The metal seal ring and the metal seal gasket described in this embodiment are made of austenitic stainless steel.
The metal sealing ring and the metal sealing gasket are made of austenitic stainless steel metal materials and can resist the high temperature below 700 ℃. The sealing ring and the valve body can be in transition fit, the sealing ring and the valve rod can be in clearance fit, the sealing gasket is pressed in a gap between the valve body and the sealing ring, the sealing ring and the sealing gasket do not shrink or deform after the compression ring is pressed, and friction torque is not generated in valve rod transmission. The sealing gasket is made of heat-resistant stainless steel materials, and is pressed on a gap between the valve body and the shaft sleeve in a plane for radial sealing during assembly.
Example four:
this embodiment is a modification of the above-described embodiment, and is a refinement of the above-described embodiment regarding the fitting state of the sealing material. The outer circular surface of the metal sealing ring is in transition fit with the valve body, and the center hole is in clearance fit with the valve rod.
The excircle of the metal sealing ring is in transition fit positioning with the valve body, when the valve works, the excircle of the metal sealing ring is increased due to the fact that the temperature is higher to enable the hole of the valve body to shrink, a gap between the excircle of the metal sealing ring and the hole disappears, and the metal sealing ring and the valve body form fixed connection. Similarly, the inner hole of the metal sealing ring is in clearance fit with the valve rod, and in order to prevent the clearance from completely disappearing, enough clearance must be reserved during installation, and no friction torque is generated in a high-temperature chamber.
Example five:
this embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment with respect to the metal filter mesh. The upper end metal filter screen and the lower extreme metal filter screen of this embodiment be the annular filter screen of parcel in the outer disc of valve rod.
The metal filter screen is a compact metal cylinder formed by winding metal wires and overlapping the metal screens, has certain compressibility, and is usually used in a filter element of an engine oil filter of an engine or other filters.
Example six:
this embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment with respect to the bushing. The material of the shaft sleeve is self-lubricating material.
The self-lubricating material is formed by condensing solid lubricant and metal powder together in a die-casting mode to form the shaft sleeve, and the shaft sleeve is provided with the solid lubricating material, so that the self-lubricating material can generate a self-lubricating effect in the use process and has high-temperature resistance.
Example seven:
the present embodiment is a modification of the above-mentioned embodiments, and is a refinement of the above-mentioned embodiments with respect to the transmission pair. The transmission of valve gap external member described in this embodiment is vice includes: a drive gear 2012 supported by a motor shaft deep groove bearing 2011 and a sector gear 2013 engaged with the drive gear, the sector gear being mounted on a valve stem supported by a deep groove bearing 2014, as shown in fig. 1.
The embodiment transmits the output of the motor shaft to the valve rod by adopting a gear pair. The gear pair has accurate transmission, large transmission rigidity and stable transmission, and is very suitable for opening and closing the valve. But the gear is bulky, and this embodiment has adopted sector gear, adopts the support of deep groove bearing as two gear shafts simultaneously, has reduced the frictional force when the gear rotates, has improved the efficiency of valve switching.
Example eight:
the present embodiment is a modification of the above-mentioned embodiments, and is a refinement of the above-mentioned embodiments regarding the valve cover kit. The bonnet assembly of this embodiment is further provided with a return spring 204, as shown in fig. 1.
The embodiment adopts the cylindrical torsion spring to pre-tighten and automatically reset, has simple structure and reliable performance, and effectively ensures the automatic closing of the valve under the fault condition of power failure.
Example nine:
the present embodiment is a modification of the above-mentioned embodiments, and is a refinement of the above-mentioned embodiments regarding the valve cover kit. The water conservancy diversion ring in the valve gap external member described in this embodiment is the stamping workpiece.
This embodiment adopts the direction of stamping workpiece water conservancy diversion ring to excrete the comdenstion water, makes the comdenstion water follow the route of predetermineeing and gets rid of smoothly, does not gather, does not influence the EGR valve and uses.
Example ten:
this embodiment is a modification of the above embodiment, and is a refinement of the above embodiment with respect to the lower metal seal assembly. The lower metal seal kit of this embodiment includes: the end cover 8, the lower end metal filter screen 701 wrapped in the end cover, the metal sealing gasket 702, the metal sealing ring 703, the gasket 704, the shaft sleeve 705 and the upper end metal filter screen 706 are sequentially arranged, as shown in fig. 3.
The lower end of the embodiment also adopts the same metal sealing mode as the upper sealing, the sealing performance is good, and the requirement of sealing and pressure maintaining of an EGR system can be met. The size of each sealing element of the lower metal sealing sleeve can be completely the same as that of the upper metal sealing sleeve, and the shapes of the parts are completely the same except that the installation sequence is different, so that the types and the number of the parts can be reduced, and the cost is reduced.
Finally, it should be noted that the above is only for illustrating the technical solution of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred arrangement, it should be understood by those skilled in the art that the technical solution of the present invention (such as the valve structure, the opening and closing form of the valve, the installation form of the valve rod, the transmission form, etc.) can be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. A high temperature end valve assembly for use in circulating exhaust gas comprising: the valve comprises a motor, a valve cover sleeve and a valve body which are sequentially installed, wherein a valve plate and a valve rod driving the valve plate to rotate are arranged in the valve body, and the valve rod is connected with the motor shaft through a transmission pair in the valve cover sleeve; a ventilation space is arranged between the valve cover sleeve and the valve body, and a cooling water channel and a flow guide ring are arranged in the valve cover sleeve around the valve rod.
2. The valve assembly of claim 1, wherein said upper metal seal assembly comprises: the lower end metal filter screen, the shaft sleeve, the gasket, the metal sealing ring, the metal sealing gasket, the compression ring and the upper end metal filter screen wrapped in the compression ring are sequentially arranged on the valve body along the valve rod.
3. The valve assembly of claim 2, wherein the metal seal ring and the metal gasket are made of austenitic stainless steel.
4. The valve assembly of claim 3, wherein the outer circumferential surface of the metal sealing ring is in transition fit with the valve body, and the central bore is in clearance fit with the valve stem.
5. The valve assembly of claim 4, wherein the upper and lower metal screens are ring screens wrapped around the outer circumferential surface of the valve stem.
6. The valve assembly of claim 5, wherein the sleeve is made of a self-lubricating material.
7. The valve assembly of any of claims 1-6, wherein the drive pair of the bonnet assembly comprises: the motor comprises a driving gear supported by a deep groove bearing driven by a motor shaft and a sector gear meshed with the driving gear, wherein the sector gear is arranged on a valve rod supported by the deep groove bearing.
8. The valve assembly of claim 7, wherein the bonnet assembly is further provided with a return spring.
9. The valve assembly of claim 8 wherein the deflector ring in the bonnet assembly is a stamped component.
10. The valve assembly of claim 8, wherein said lower metal seal assembly comprises: the end cover, the lower end metal filter screen, the metal sealing gasket, the metal sealing ring, the gasket, the shaft sleeve and the upper end metal filter screen are arranged in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110387394.0A CN113090422A (en) | 2021-04-12 | 2021-04-12 | High-temperature end valve assembly for exhaust gas recirculation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110387394.0A CN113090422A (en) | 2021-04-12 | 2021-04-12 | High-temperature end valve assembly for exhaust gas recirculation |
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| CN113090422A true CN113090422A (en) | 2021-07-09 |
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| CN202110387394.0A Pending CN113090422A (en) | 2021-04-12 | 2021-04-12 | High-temperature end valve assembly for exhaust gas recirculation |
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| JP2016048050A (en) * | 2014-08-28 | 2016-04-07 | 株式会社デンソー | Egr device |
| CN105299285A (en) * | 2015-11-11 | 2016-02-03 | 上海东宝阀门制造有限公司 | Three-eccentric bidirectional all-metal hard-seal butterfly valve |
| CN206845922U (en) * | 2017-05-26 | 2018-01-05 | 浙江华晨阀门有限公司 | A kind of three dimension eccentric multiple-layer metal hard seal butterfly valve |
| CN109424753A (en) * | 2017-08-29 | 2019-03-05 | 湖北泰和石化设备有限公司 | One kind may filter that impurity seals fused salt butterfly valve firmly |
| CN109441673A (en) * | 2019-01-03 | 2019-03-08 | 无锡隆盛科技股份有限公司 | A kind of torque motor tab (s) formula EGR valve |
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Effective date of registration: 20220711 Address after: 714000 West Section of Huashan Street, Weinan High-tech Industrial Development Zone, Shaanxi Province, 89 Applicant after: Weinan Meiyite Engine Emission Reduction Technology Co.,Ltd. Address before: 714000 West Section of Huashan Street, Weinan High-tech Industrial Development Zone, Shaanxi Province, 89 Applicant before: Weinan meilianqiao Automobile New Technology Research Institute Co.,Ltd. |
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Application publication date: 20210709 |