CN110966411A - Flow regulating device and coke oven heating system - Google Patents
Flow regulating device and coke oven heating system Download PDFInfo
- Publication number
- CN110966411A CN110966411A CN201911327527.4A CN201911327527A CN110966411A CN 110966411 A CN110966411 A CN 110966411A CN 201911327527 A CN201911327527 A CN 201911327527A CN 110966411 A CN110966411 A CN 110966411A
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- Prior art keywords
- valve seat
- regulating device
- flow
- inlet
- channel
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B21/00—Heating of coke ovens with combustible gases
- C10B21/10—Regulating and controlling the combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
- F16K1/04—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle with a cut-off member rigid with the spindle, e.g. main valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
- F16K1/38—Valve members of conical shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
- F16K1/422—Valve seats attachable by a threaded connection to the housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0254—Construction of housing; Use of materials therefor of lift valves with conical shaped valve members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lift Valve (AREA)
Abstract
The invention relates to the technical field of coke oven gas, and discloses a flow regulating device and a coke oven heating system. The flow regulating device comprises a valve seat (1) and a valve core (2) installed in the valve seat (1); the valve seat (1) comprises a main body part (11) and an inlet (1121) and an outlet (1131) which are formed on the main body part (11); the flow rate regulating device further comprises a control unit (3) for regulating the flow rate through the outlet (1131) by controlling the flow area between the valve element (2) and the inlet (1121). The flow regulating device is simple in structure, convenient and fast to operate and high in regulating precision.
Description
Technical Field
The invention relates to the technical field of coke oven gas, in particular to a flow regulating device and a coke oven heating system.
Background
The existing regulating device for the coal gas amount of the combustion chamber of the downward-spraying coke oven comprises a four-way pipe shell, a pore plate, a spring assembly and the like, wherein the pore plate is fixed on the four-way pipe shell, the regulation is realized by replacing the pore plate or adding lead wires with different diameters into the pore plate, the labor intensity is high, the regulating precision is poor, and the precise regulation cannot be realized.
Disclosure of Invention
The invention aims to solve the problems of high labor intensity, poor adjustment precision and incapability of realizing accurate adjustment in the prior art in the replacement of orifice plates, and provides a flow regulating device which has the characteristics of convenience in operation and high adjustment precision.
In order to achieve the above object, an aspect of the present invention provides a flow rate regulating device including a valve seat and a spool mounted in the valve seat; the valve seat comprises a main body part and an inlet and an outlet formed on the main body part; the flow regulating device also comprises a control unit for regulating the flow passing through the outlet by controlling the flow area between the valve core and the inlet.
Furthermore, the valve core comprises a cone structure, and the rotation center line of the cone structure is vertical to the plane of the inlet; the control unit effects regulation of fluid flow through the outlet by controlling movement of the cone structure relative to the inlet.
Further, the body portion includes a bottom wall; the inlet is formed in the bottom wall.
Further, the main body portion includes a cylindrical side wall, the bottom wall is mounted at a first end of the side wall, and the outlet is formed in the side wall.
Further, the main body portion includes a plurality of the outlets circumferentially distributed on the sidewall.
Further, the valve seat comprises a fixing cover mounted on the second end of the side wall for fixing the main body; and the fixed cover is provided with an external thread for fixedly mounting the valve seat.
Furthermore, the control unit comprises an adjusting rod, one end of the adjusting rod is connected with the valve core, and the other end of the adjusting rod penetrates through the fixed cover and is exposed outside the valve seat.
Further, the flow regulating device also comprises a multi-way pipe used for installing the valve seat; the multiway tube includes a first channel and a second channel having an included angle.
Further, the valve seat is mounted in the multi-ported tube with the inlet facing the first channel; the multi-ported tube further comprises a third channel for securing the valve seat; and the side wall of the third channel is provided with internal threads for mounting the valve seat.
In a second aspect, the invention provides a coke oven heating system comprising the flow regulating device described above.
According to the technical scheme, the valve core is arranged in the valve seat; the valve seat is provided with the inlet for the fluid to enter and the outlet for the fluid to flow out; the flow control device has the advantages that the flow through the outlet is adjusted by controlling the flow area between the valve core and the inlet, so that the flow control purpose is realized, the flow control device is simple in structure, convenient and quick to operate and high in adjustment precision.
Drawings
FIG. 1 is a schematic view of the installation configuration of a flow control device installed in a cross according to an embodiment of the present application.
Description of the reference numerals
1-a valve seat; 11-a body portion; 111-a valve seat receiving cavity; 112-a bottom wall; 1121-inlet; 113-a side wall; 1131-outlet; 12-a fixed cover; 121-a threaded hole; 2-a valve core; 21-a pyramidal structure; 3-a control unit; 31-adjusting rod; 32-a manipulation section; 4-multi-way pipe; 41-a first channel; 42-a second channel; 43-a third channel; 44-fourth channel.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. In the present invention, it is to be understood that the terms "away", "toward", "upper", "lower", "front", "rear", "left", "right", and the like indicate an orientation or positional relationship corresponding to an orientation or positional relationship in actual use; "inner and outer" refer to the inner and outer relative to the profile of the components themselves; this is done solely for the purpose of facilitating the description of the invention and simplifying the description without indicating that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation and therefore should not be construed as limiting the invention.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to achieve the above object, one aspect of the present invention provides a flow rate regulating device, as shown in fig. 1: the flow regulating device comprises a valve seat 1 and a valve core 2 installed in the valve seat 1; the valve seat 1 includes a main body 11, and an inlet 1121 and an outlet 1131 formed on the main body 11; the flow rate adjusting apparatus further includes a control unit 3 that adjusts the flow rate through the outlet 1131 by controlling the flow area between the valve element 2 and the inlet 1121.
By mounting the valve element 2 in the valve seat 1; the valve seat 1 is provided with the inlet 1121 for fluid to enter and the outlet 1131 for fluid to flow out; the flow rate through the outlet 1131 is adjusted by controlling the flow area between the valve core 2 and the inlet 1121, so that the flow rate control is realized.
In the present invention, the flow area between the valve element 2 and the inlet 1121 may be controlled in various ways, for example, by changing the sectional size of the valve element 2 (for example, providing the valve element 2 in a structure in which the section can be extended). Preferably, the valve core 2 comprises a conical structure 21, and a rotation center line of the conical structure 21 is perpendicular to a plane where the inlet 1121 is located; the control unit 3 effects regulation of the fluid flow through the outlet 1131 by controlling the movement of the cone structure 21 relative to the inlet 1121.
Thus, by moving the cone structure 21 along the center line of revolution of the cone structure 21, the cross-sectional size of the portion of the cone structure 21 passing through the inlet 1121 can be varied, thereby varying the flow area between the cone structure 21 and the inlet 1121 to achieve regulation of the flow through the outlet 1131.
Preferably, the body portion 11 includes a bottom wall 112; the inlet 1121 is formed in the bottom wall 112. This structure is simple and facilitates the passage of fluid.
Preferably, the main body 11 includes a cylindrical sidewall 113, the bottom wall 112 is mounted at a first end of the sidewall 113, and the outlet 1131 is formed on the sidewall 113.
This structure is suitable for the case where there is an included angle between the axes of the inlet pipe and the outlet pipe connected to the flow rate adjusting device, and by providing the outlet 1131, the gas coming from the inlet 1121 can smoothly flow out through the outlet 1131.
The flow regulator of an embodiment includes three outlets 1131, and three outlets 1131 are uniformly distributed along the circumference of the sidewall 113, so that the portion of the sidewall 113 without opening forms a support portion for uniformly transmitting the pressure transmitted from the fixing cover 12 to the bottom wall 112, which is beneficial to preventing the sidewall 113 from being structurally unstable.
Preferably, the body portion 11 includes a plurality of the outlets 1131 circumferentially distributed on the sidewall 113.
This ensures that gas entering the flow regulating device through the inlet 1121 smoothly exits the flow regulating device through the outlet 1131. And ensures that the sidewall 113 is uniformly stressed.
Preferably, the valve seat 1 includes a fixing cover 12 mounted on a second end of the sidewall 113 for fixing the body portion 11; the fixed cover 12 is provided with an external thread for fixedly mounting the valve seat 1.
By providing the fixing cover 12, the valve seat 1 and the valve element 2 can be fixed in a valve seat accommodating chamber capable of accommodating the valve seat 1 and the valve element 2 mounted in the valve seat 1; an internal thread matched with the external thread is arranged on the cavity wall of the valve seat accommodating cavity; the valve seat 1 and the valve element 2 installed in the valve seat 1 can be conveniently installed in the valve seat accommodating cavity through the internal thread and the external thread, or the valve seat 1 and the valve element 2 installed in the valve seat 1 can be detached from the valve seat accommodating cavity.
Preferably, the control unit 3 includes an adjusting rod 31 having one end connected to the valve core 2 and the other end passing through the fixed cover 12 and exposed to the outside of the valve seat 1.
A threaded hole 121 for mounting the adjusting rod 31 is formed on the fixing cover 12; the adjusting rod 31 includes an external thread for matching with the threaded hole 121, the adjusting rod 31 matches with the threaded hole 121 through the external thread, the adjusting rod 31 is rotated, the adjusting rod 31 drives the valve core 2 to move along the rotation center line of the valve core 2 relative to the inlet 1121 while rotating, so as to change the flow area between the valve core 2 and the inlet 1121, and thus adjust the flow passing through the inlet 1121, and further adjust the flow passing through the outlet 1131.
Preferably, the control unit 3 comprises an operating portion 32 arranged at an end of the regulating rod 31 facing away from the valve cartridge 2. By rotating the operating part 32, the adjusting rod 31 moves spirally along the threaded hole 121 and drives the valve element 2 to move along the rotation center line of the cone structure 21, so as to change the flow area between the valve element 2 and the inlet 1121, and further adjust the flow rate of the outlet 1131.
The handling portion 32 is a polygonal block, which is beneficial for an operator to clamp the handling portion 32 and conveniently adjust the flow area between the valve core 2 and the inlet 1121.
Further preferably, the flow rate adjusting apparatus further includes a display unit for identifying the size of the flow area passing through the inlet 1121, and the display unit is configured to facilitate an operator to accurately control the flow rate passing through the inlet 1121. The display unit may take a variety of forms, such as a graduated scale.
Preferably, the flow regulating device further comprises a multi-way tube 4 for mounting said valve seat 1; the multi-way tube 4 comprises a first channel 41 and a second channel 42 having an included angle.
As shown in fig. 1, the wall of the multi-way tube 4 defines the valve seat accommodating cavity capable of accommodating the valve seat 1 and the valve element 2 installed in the valve seat 1, and the first channel 41 and the second channel 42 with included angles are communicated through the valve seat accommodating cavity; thus, two pipes with a certain included angle can be communicated through the first channel 41 and the second channel 42.
Preferably, the valve seat 1 is mounted in the multiway tube 4 with the inlet 1121 facing the first channel 41; the multi-way tube 4 further comprises a third channel 43 for fixing the valve seat 1; the side wall of the third channel 43 is provided with an internal thread for mounting the valve seat 1.
The valve seat 1 enters the valve seat accommodating cavity from the opening of the third channel 43, in a specific embodiment, the first channel 41 is connected with a first gas inlet pipeline, the tail end of the first gas inlet pipeline extends into the first channel 41, and the outer wall of the first gas inlet pipeline is matched with the inner wall of the first channel 41 in a radial direction; the second channel 42 is connected with a second gas pipeline leading to a combustion chamber of the coke oven; the valve seat 1 abuts against the end of the first gas inlet pipe through the bottom wall 112. The fixed cover 12 is used for installing the valve seat 1 and the valve core 2 installed in the valve seat 1 in the valve seat accommodating cavity defined by the multi-way pipe 4 through the matching of the external thread and the internal thread.
Preferably, the multi-way tube 4 further comprises a fourth channel 44, which is coaxially distributed with the second channel 42. In one embodiment, the multi-way tube 4 is placed with the second channel 42 on top and the fourth channel 44 on bottom, and the first channel 41 and the third channel 43 are horizontally arranged; the fourth channel 44 can be arranged to facilitate cleaning of deposits in the multi-way tube 4 and various pipes connected to the multi-way tube 4. In normal operation, the opening of the fourth channel 44 is closed. When the multi-way pipe 4 and various pipes connected with the multi-way pipe 4 need to be cleaned, the opening of the fourth channel 44 is opened, and a tool for cleaning the deposits enters the multi-way pipe 4 and the first gas pipe and the second gas pipe connected with the multi-way pipe 4 from the opening of the fourth channel 44 to clean the deposits.
In a second aspect, the invention provides a coke oven heating system comprising the flow regulating device described above.
The coke oven heating system comprises a coke oven combustion chamber, a first gas pipeline connected with a gas source and a second gas pipeline connected between the first gas pipeline and the coke oven combustion chamber; the flow regulating device is respectively connected with the first gas pipeline and the second gas pipeline through the multi-way pipe 4. As shown in fig. 1, the first gas pipeline communicates with the first passage 41; the second passage 42 communicates with the second gas conduit. The coke oven combustion chamber is arranged above the multi-way tube 4, the second channel 42 is arranged above the fourth channel 44, and the first channel 41 and the third channel 43 are horizontally arranged.
The technical advantages of the coke oven heating system and the flow regulating device are not described herein.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention. Including each of the specific features, are combined in any suitable manner. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (10)
1. A flow regulating device, characterized by comprising a valve seat (1) and a valve element (2) mounted in the valve seat (1); the valve seat (1) comprises a main body part (11) and an inlet (1121) and an outlet (1131) which are formed on the main body part (11); the flow rate regulating device further comprises a control unit (3) for regulating the flow rate through the outlet (1131) by controlling the flow area between the valve element (2) and the inlet (1121).
2. A flow-rate regulating device according to claim 1, characterized in that the spool (2) comprises a conical structure (21), the centre line of revolution of the conical structure (21) being perpendicular to the plane of the inlet (1121); the control unit (3) effects regulation of fluid flow through the outlet (1131) by controlling movement of the cone structure (21) relative to the inlet (1121).
3. A flow-rate regulating device according to claim 1, characterized in that said main body (11) comprises a bottom wall (112); the inlet (1121) is formed on the bottom wall (112).
4. A flow regulating device according to claim 1, characterized in that the body portion (11) comprises a cylindrical side wall (113), the bottom wall (112) being mounted at a first end of the side wall (113), the outlet (1131) being formed in the side wall (113).
5. A flow-rate regulating device according to claim 4, characterized in that the main body (11) comprises a plurality of said outlets (1131) circumferentially distributed on the side wall (113).
6. A flow regulating device according to claim 4, characterized in that the valve seat (1) comprises a fixing cap (12) mounted at a second end of the side wall (113) for fixing the body portion (11); and the fixed cover (12) is provided with an external thread for fixedly mounting the valve seat (1).
7. Flow rate regulating device according to claim 6, characterized in that the control unit (3) comprises an adjusting rod (31) connected at one end to the spool (2) and at the other end passing through the fixed cover (12) and exposed outside the valve seat (1).
8. A flow regulating device according to any of claims 1-7, characterized in that the flow regulating device further comprises a multi-way tube (4) for mounting the valve seat (1); the multi-way tube (4) comprises a first channel (41) and a second channel (42) with included angles.
9. Flow regulating device according to claim 8, characterized in that the valve seat (1) is mounted in the multiway tube (4) with the inlet (1121) facing the first channel (41); the multi-way tube (4) further comprises a third channel (43) for fixing the valve seat (1); the side wall of the third channel (43) is provided with an internal thread for installing the valve seat (1).
10. Coke oven heating system, characterized in that it comprises a flow regulating device according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911327527.4A CN110966411A (en) | 2019-12-20 | 2019-12-20 | Flow regulating device and coke oven heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911327527.4A CN110966411A (en) | 2019-12-20 | 2019-12-20 | Flow regulating device and coke oven heating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110966411A true CN110966411A (en) | 2020-04-07 |
Family
ID=70035713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911327527.4A Pending CN110966411A (en) | 2019-12-20 | 2019-12-20 | Flow regulating device and coke oven heating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110966411A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526339A (en) * | 2022-04-22 | 2022-05-24 | 陕西祥瑞电气工程自动化有限公司 | Gas flow fine adjuster |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB489063A (en) * | 1937-06-11 | 1938-07-19 | Woodall Duckham 1920 Ltd | Improvements in underjet-fired coke-ovens |
| CN101701157A (en) * | 2009-09-21 | 2010-05-05 | 芜湖新兴铸管有限责任公司 | Horizontal temperature regulating and controlling system of coke oven heated by coke oven gas |
| CN201520741U (en) * | 2009-11-06 | 2010-07-07 | 攀钢集团攀枝花钢钒有限公司 | Coke oven gas flow regulator |
| CN201545803U (en) * | 2009-11-16 | 2010-08-11 | 中冶焦耐(大连)工程技术有限公司 | Novel coke oven gas adjusting device |
| CN103756690A (en) * | 2014-01-23 | 2014-04-30 | 武汉科技大学 | Coke oven gas flow regulator capable of accurate regulation |
| US20170088778A1 (en) * | 2014-05-21 | 2017-03-30 | Thyssenkrupp Industrial Solutions Ag | Adjusting device for actuating an element within a gas chamber through which a coke oven gas flows, and method for operating the adjusting device |
-
2019
- 2019-12-20 CN CN201911327527.4A patent/CN110966411A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB489063A (en) * | 1937-06-11 | 1938-07-19 | Woodall Duckham 1920 Ltd | Improvements in underjet-fired coke-ovens |
| CN101701157A (en) * | 2009-09-21 | 2010-05-05 | 芜湖新兴铸管有限责任公司 | Horizontal temperature regulating and controlling system of coke oven heated by coke oven gas |
| CN201520741U (en) * | 2009-11-06 | 2010-07-07 | 攀钢集团攀枝花钢钒有限公司 | Coke oven gas flow regulator |
| CN201545803U (en) * | 2009-11-16 | 2010-08-11 | 中冶焦耐(大连)工程技术有限公司 | Novel coke oven gas adjusting device |
| CN103756690A (en) * | 2014-01-23 | 2014-04-30 | 武汉科技大学 | Coke oven gas flow regulator capable of accurate regulation |
| US20170088778A1 (en) * | 2014-05-21 | 2017-03-30 | Thyssenkrupp Industrial Solutions Ag | Adjusting device for actuating an element within a gas chamber through which a coke oven gas flows, and method for operating the adjusting device |
Non-Patent Citations (1)
| Title |
|---|
| 西安电力学校: "《火力发电厂高压锅炉设备及运行 上》", 30 September 1978, 电力工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526339A (en) * | 2022-04-22 | 2022-05-24 | 陕西祥瑞电气工程自动化有限公司 | Gas flow fine adjuster |
| CN114526339B (en) * | 2022-04-22 | 2022-08-09 | 陕西祥瑞电气工程自动化有限公司 | Gas flow fine adjuster |
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Application publication date: 20200407 |
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