CN219492450U - Entrance door structure and water turbine - Google Patents
Entrance door structure and water turbine Download PDFInfo
- Publication number
- CN219492450U CN219492450U CN202320545399.6U CN202320545399U CN219492450U CN 219492450 U CN219492450 U CN 219492450U CN 202320545399 U CN202320545399 U CN 202320545399U CN 219492450 U CN219492450 U CN 219492450U
- Authority
- CN
- China
- Prior art keywords
- bolt
- working
- safety
- door structure
- threaded holes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Pressure Vessels And Lids Thereof (AREA)
Abstract
The application provides a business turn over door structure and hydraulic turbine, business turn over door structure includes: the installation body is provided with a manhole and a plurality of first threaded holes and a plurality of second threaded holes which are arranged around the manhole; the entrance door cover is hinged to the mounting body and is provided with a first bolt mounting hole corresponding to the first threaded hole and a second bolt mounting hole corresponding to the second threaded hole; the first bolt mounting hole is internally provided with a working bolt, and the second bolt mounting hole is internally provided with a safety bolt. According to the method, when water flows are introduced into the installation body, only the working bolts bear alternating working loads, the safety bolts only bear second bolt pretightening force of self installation and are in an absolute safety state, when the working bolts bear the working loads and break, the safety bolts can bear subsequent working loads, and therefore serious safety accidents of a flooded factory building caused after the working bolts of the entrance door break are avoided.
Description
Technical Field
The application relates to the technical field of pumped storage, in particular to a door structure and a water turbine.
Background
The volute inlet door is the most important overhauling inlet channel of the water turbine and is usually arranged on an expansion joint of a water inlet ball valve or the volute, and the working position of the volute inlet door determines that the volute inlet door needs to bear the upstream ultrahigh pressure for a long time and also bears the boost pressure in the volute when the unit swings load. Compared with a conventional hydropower station with pure power generation, due to the particularities of frequent start and stop and working condition conversion of the pumped storage unit, the screw bolt for closing the door handle of the volute needs to bear long-term alternating stress, so that the risk of fatigue damage exists.
At present, the safety of the volute entrance door is mainly ensured by an entrance door handle closing bolt, the reliability of the volute entrance door is directly closely related to the safety of the whole factory building of a power station, and once the volute entrance door handle closing bolt is broken, high-pressure water can flow out from an inner hole of an entrance door seat, so that serious safety accidents of a flooded factory building are easily caused.
Disclosure of Invention
The application provides a business turn over door structure and hydraulic turbine, aims at solving the current spiral case business turn over door and closes the technical problem that the bolt has the fracture risk.
In a first aspect, the present application provides a door structure comprising:
the installation body is provided with a manhole and a plurality of first threaded holes and a plurality of second threaded holes which are arranged around the manhole;
the entrance door cover is hinged to the mounting body and is provided with a first bolt mounting hole corresponding to the first threaded hole and a second bolt mounting hole corresponding to the second threaded hole;
the first bolt mounting hole is internally provided with a working bolt, the threaded part of the working bolt is screwed in the first threaded hole, the second bolt mounting hole is internally provided with a safety bolt, and the threaded part of the safety bolt is screwed in the second threaded hole;
when water flow is introduced into the installation body, the working bolt bears the first bolt pretightening force and the working load, and the safety bolt only bears the second bolt pretightening force.
In some embodiments, the plurality of first threaded holes are arranged in an annular array about an axis of the manhole;
the second threaded holes are annularly arranged around the axis of the manhole, and the distribution circle radius corresponding to the second threaded holes is larger than the distribution circle radius corresponding to the first threaded holes.
In some embodiments, the manhole diameter is 600mm to 800mm;
the radius of the distribution circle corresponding to the plurality of second threaded holes and the radius of the distribution circle corresponding to the plurality of first threaded holes satisfy the following relation:
1.2≤R2：R1≤1.5
wherein R1 is the distribution circle radius corresponding to the first threaded holes, and R2 is the distribution circle radius corresponding to the second threaded holes.
In some embodiments, at least one of the safety bolt and the work bolt is a stud.
In some embodiments, the working bolt is a stud and the safety bolt is a hex head bolt;
one end of the double-end stud is screwed in the first threaded hole, and the other end of the double-end stud is screwed with a nut.
In some embodiments, the first bolt pretension and the working load satisfy the following relationship:
3P0≤P1≤4P0
wherein P1 is the first bolt pretightening force, and P0 is the working load.
In some embodiments, the second bolt pretension and the working load satisfy the following relationship:
1.2P0≤P2≤1.5P0
wherein P2 is the second bolt pretightening force, and P0 is the working load.
In some embodiments, the first bolt pretension is 300MPa to 400MPa;
the pretightening force of the second bolt is 100 MPa-150 MPa.
In some embodiments, the side of the entry door cover facing the entry door mount has a water baffle with an arcuate surface adapted to the inner wall surface of the mounting body.
In a second aspect, the present application provides a hydraulic turbine comprising a door structure as described in the first aspect.
According to the working bolt installing structure, the working bolt is installed in the first bolt installing hole of the entrance door cover, the safety bolt is installed in the second bolt installing hole, when water flow is introduced into the installation body, only the working bolt bears alternating working load, the safety bolt only bears second bolt pretightening force installed by the safety bolt and is in an absolute safety state, when the working bolt bears alternating working load and breaks, the safety bolt can bear subsequent working load, and therefore serious accidents of a flooded factory building caused by breaking of the working bolt of the entrance door of the volute are avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an access door structure provided in an embodiment of the present application;
fig. 2 is a schematic cross-sectional view of an access door structure provided in an embodiment of the present application.
The door comprises a 10 mounting body, a 11 entrance door mounting seat, a 111 entrance hole, a 112 first threaded hole, a 113 second threaded hole, a 20 entrance door cover, a 21 first bolt mounting hole, a 22 second bolt mounting hole, a 23 water baffle, a 231 cambered surface, a 30 working bolt and a 40 safety bolt.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In this application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the utility model. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present utility model may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the utility model with unnecessary detail. Thus, the present utility model is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
The embodiment of the application provides a door structure and a water turbine, and the door structure and the water turbine are respectively described in detail below.
First, referring to fig. 1 and fig. 2, fig. 1 shows a schematic structural diagram of an entrance door structure according to an embodiment of the present application, and fig. 2 shows a schematic sectional view of an entrance door structure according to an embodiment of the present application, where the entrance door structure includes:
a mounting body 10, the mounting body 10 having a manhole mounting seat 11, the manhole mounting seat 11 having a manhole 111 and a plurality of first screw holes 112 and a plurality of second screw holes 113 arranged around the manhole 111;
the entrance door cover 20, the entrance door cover 20 is hinged on the installation body 10, the entrance door cover 20 has a first bolt installation hole 21 corresponding to the first threaded hole 112, and a second bolt installation hole 22 corresponding to the second threaded hole 113;
the first bolt mounting hole 21 is internally provided with a working bolt 30, a threaded part of the working bolt 30 is screwed into the first threaded hole 112, the second bolt mounting hole 22 is internally provided with a safety bolt 40, and a threaded part of the safety bolt 40 is screwed into the second threaded hole 113;
when water flows into the installation body 10, the working bolt 30 receives a first bolt pretightening force and a working load, and the safety bolt 40 receives only a second bolt pretightening force.
Specifically, the installation body 10 may be a volute casing of a water turbine or an expansion joint of a ball valve, and the installation body 10 is provided with a door installation seat 11, so that a maintainer can enter and exit through a manhole 111 on the door installation seat 11. Generally, the manhole 111 is circular to avoid stress concentration phenomenon occurring in the square manhole 111. It will be appreciated that the manhole 111 may also be oval. Illustratively, the manhole 111 may have a diameter of 600mm to 800mm.
The entrance door cover 20 is hinged on the installation body 10, and the entrance hole 111 can be closed or opened by rotating the entrance door cover 20, so that the tightness of the installation body 10 is ensured when the entrance door cover 20 is closed, and maintenance personnel can conveniently enter and exit the entrance hole 111 when the entrance door cover 20 is opened. The door cover 20 has a first bolt mounting hole 21 corresponding to the first screw hole 112 and a second bolt mounting hole 22 corresponding to the second screw hole 113, so that the threaded portion of the working bolt 30 passes through the first bolt mounting hole 21 and is screwed into the first screw hole 112, and the threaded portion of the safety bolt 40 passes through the second bolt mounting hole 22 and is screwed into the second screw hole 113, so that the door cover 20 is simultaneously locked on the door mount 11 by the working bolt 30 and the safety bolt 40.
In this embodiment of the present application, the working bolt 30 is installed through the first bolt installation hole 21 of the entrance door cover 20, and the safety bolt 40 is installed through the second bolt installation hole 22, when water flow is introduced into the installation body 10, only the working bolt 30 bears alternating working load, and the safety bolt 40 only bears the second bolt pretightening force installed by itself and is in an absolute safety state, when the working bolt 30 bears alternating working load and breaks, the safety bolt 40 can bear subsequent working load, thereby avoiding serious safety accidents of a flooded factory caused by breaking the volute entrance door working bolt 30.
In some embodiments of the present application, for example, for embodiments in which the manhole 111 is circular, with continued reference to fig. 1 and 2, the plurality of first threaded holes 112 are annularly arranged around the axis of the manhole 111, the plurality of second threaded holes 113 are annularly arranged around the axis of the manhole 111, and the radius of the distribution circle corresponding to the plurality of second threaded holes 113 is greater than the radius of the distribution circle corresponding to the plurality of first threaded holes 112. That is, the plurality of second screw holes 113 are respectively formed at outer circles of the plurality of first screw holes 112, and correspondingly, the plurality of second screw bolt mounting holes 22 are respectively formed at outer circles of the first screw bolt mounting holes 21, and when the door cover 20 is mature in pressure, the stress distribution thereof is mainly concentrated at the center of the door cover 20, and since the safety screw bolt 40 is positioned at the outer circle of the working screw bolt 30, the safety screw bolt 40 can be subjected to only the second screw bolt pretightening force, so that the absolute safety of the working state safety screw bolt 40 is ensured.
Further, in some embodiments of the present application, for example, for embodiments in which the radius of the distribution circle corresponding to the plurality of second threaded holes 113 is greater than the radius of the distribution circle corresponding to the plurality of first threaded holes 112, continuing to refer to fig. 1 and 2, wherein the diameter of the manhole 111 is 600mm to 800mm;
the distribution circle radius corresponding to the plurality of second screw holes 113 and the distribution circle radius corresponding to the plurality of first screw holes 112 satisfy the following relation:
1.2≤R2：R1≤1.5
wherein, R1 is a distribution circle radius corresponding to the plurality of first screw holes 112, and R2 is a distribution circle radius corresponding to the plurality of second screw holes 113.
It should be noted that, in the case where the diameter of the manhole 111 is 600mm to 800mm, since the radius of the distribution circle corresponding to the plurality of second threaded holes 113 and the radius of the distribution circle corresponding to the plurality of first threaded holes 112 satisfy the above-mentioned relation, when the installation body 10 is in the working state when the water flow is introduced, the safety bolt 40 installed in the second threaded holes 113 can only bear the pretightening force of the second bolt, but not bear the working load of the water flow on the manhole cover 20, so as to ensure the absolute safety of the safety bolt 40.
Preferably, the diameter of the inlet hole 111 is 600mm, and the ratio of the radius of the distribution circle corresponding to the plurality of second threaded holes 113 to the radius of the distribution circle corresponding to the plurality of first threaded holes 112 is 1.3.
In some embodiments of the present application, at least one of the safety bolt 40 and the work bolt 30 is a stud. When the door 20 is repeatedly closed or opened, one end of the stud may remain in the first threaded hole 112 and/or the second threaded hole 113, and the first bolt mounting hole 21 and/or the second bolt mounting hole 22 of the door 20 may be correspondingly assembled on the stud, so that the stud provides a certain support for the door 20 when the door 20 is assembled or disassembled, and the door 20 is convenient to be assembled and disassembled.
It will be appreciated that the safety bolt 40 and the working bolt 30 may also be other types of bolted connections, such as socket head cap bolts.
Further, in some embodiments of the present application, the working bolt 30 is a stud, the safety bolt 40 is a hexagon head bolt, one end of the stud is screwed into the first threaded hole 112, and the other end is screwed with a nut. Because the working bolt 30 is located at the inner ring of the safety bolt 40, when the door installation seat 11 of the door cover 20 is turned, the door cover 20 can be preliminarily fixed by the stud, and the hinge of the door cover 20 is not easy to interfere with the stud.
In some embodiments of the present application, the first bolt pretension and the working load satisfy the following relationship:
3P0≤P1≤4P0
wherein P1 is the first bolt pretightening force, and P0 is the working load.
In some embodiments of the present application, the second bolt pretension and the working load satisfy the following relationship:
1.2P0≤P2≤1.5P0
wherein P2 is the second bolt pretightening force, and P0 is the working load.
In some embodiments of the present application, the first bolt pretension is 300MPa to 400MPa, the second bolt pretension is 100MPa to 150MPa, and the working load is 80MPa to 100MPa.
In some embodiments of the present application, with continued reference to fig. 2, a side of the access door cover 20 facing the access door mount 11 has a water baffle 23, and the water baffle 23 has an arc surface 231 adapted to an inner wall surface of the mounting body 10. Because the inner wall surface of the installation body 10 is matched with the cambered surface 231, when water flow is introduced into the installation body 10, the water baffle 23 can prevent the water flow from directly entering the manhole 111, so that the phenomenon of overhigh work load caused by direct flushing of the water flow into the manhole can be avoided.
It should be noted that the foregoing description of the door structure is intended to clearly illustrate the implementation verification process of the present application, and those skilled in the art may make equivalent modifications to design under the guidance of the present application, for example, screws may be used to mount the door cover 20 on the door mount 11.
Further, in order to better implement the entrance structure in the embodiment of the present application, on the basis of the entrance structure, the present application further provides a water turbine, where the water turbine includes the entrance structure according to any one of the embodiments described above. Because the hydraulic turbine in this application embodiment is provided with the door structure of the above embodiment, the hydraulic turbine has all the beneficial effects of the door structure, and is not described here again.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of one embodiment that are not described in detail in the foregoing embodiments may be referred to in the foregoing detailed description of other embodiments, which are not described herein again.
While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements, and adaptations of the present application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within this application, and are therefore within the spirit and scope of the exemplary embodiments of this application.
Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the present application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the present application may be combined as suitable.
Likewise, it should be noted that in order to simplify the presentation disclosed herein and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are presented in the claims are required for the subject application. Indeed, less than all of the features of a single embodiment disclosed above.
In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations that may be employed in some embodiments to confirm the breadth of the range, in particular embodiments, the setting of such numerical values is as precise as possible.
For each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited in this application, the entire contents of which are hereby incorporated by reference into this application, except for the application history documents which are inconsistent or conflict with the contents of this application, and for documents which have limited the broadest scope of the claims of this application (currently or hereafter attached to this application). It is noted that the descriptions, definitions, and/or terms used in the subject matter of this application are subject to such descriptions, definitions, and/or terms if they are inconsistent or conflicting with such descriptions, definitions, and/or terms.
The foregoing has described in detail a door structure and a water turbine provided in embodiments of the present application, and specific examples have been applied herein to illustrate the principles and embodiments of the present utility model, where the foregoing examples are provided to assist in understanding the methods and core ideas of the present utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present utility model, the present description should not be construed as limiting the present utility model.
Claims (10)
1. A door structure comprising:
a mounting body having a manhole and a plurality of first and second threaded holes arranged around the manhole;
the entrance door cover is hinged to the mounting body and is provided with a first bolt mounting hole corresponding to the first threaded hole and a second bolt mounting hole corresponding to the second threaded hole;
a working bolt is arranged in the first bolt mounting hole, a threaded part of the working bolt is screwed in the first threaded hole, a safety bolt is arranged in the second bolt mounting hole, and a threaded part of the safety bolt is screwed in the second threaded hole;
when water flow is introduced into the installation body, the working bolt bears the first bolt pretightening force and the working load, and the safety bolt only bears the second bolt pretightening force.
2. The entry door structure of claim 1, wherein a plurality of said first threaded holes are arranged in an annular array about an axis of said entry hole;
the second threaded holes are annularly arranged around the axis of the manhole, and the distribution circle radius corresponding to the second threaded holes is larger than the distribution circle radius corresponding to the first threaded holes.
3. The entry gate structure of claim 2, wherein the entry manhole has a diameter of 600mm to 800mm;
the radius of the distribution circle corresponding to the plurality of second threaded holes and the radius of the distribution circle corresponding to the plurality of first threaded holes satisfy the following relation:
1.2≤R2：R1≤1.5
r1 is a distribution circle radius corresponding to the first threaded holes, and R2 is a distribution circle radius corresponding to the second threaded holes.
4. The entry door structure of claim 1, wherein at least one of the safety bolt and the service bolt is a stud.
5. The entry door structure of claim 4, wherein the working bolt is a stud and the safety bolt is a hex head bolt;
one end of the double-end stud is screwed in the first threaded hole, and the other end of the double-end stud is screwed with a nut.
6. The entry door structure of claim 1, wherein the first bolt preload and the work load satisfy the following relationship:
3P0≤P1≤4P0
wherein P1 is the first bolt pretightening force, and P0 is the working load.
7. The entry door structure of claim 1, wherein the second bolt preload and the working load satisfy the following relationship:
1.2P0≤P2≤1.5P0
wherein P2 is the second bolt pretightening force, and P0 is the working load.
8. The entry door structure of claim 1, wherein the first bolt pretension is 300MPa to 400MPa;
the pretightening force of the second bolt is 100 MPa-150 MPa.
9. The entry door structure according to any one of claims 1 to 8, wherein a side of the entry door cover facing the entry door mount has a water baffle having an arc surface adapted to an inner wall surface of the mount body.
10. A hydraulic turbine comprising a door structure as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320545399.6U CN219492450U (en) | 2023-03-20 | 2023-03-20 | Entrance door structure and water turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320545399.6U CN219492450U (en) | 2023-03-20 | 2023-03-20 | Entrance door structure and water turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219492450U true CN219492450U (en) | 2023-08-08 |
Family
ID=87477627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320545399.6U Active CN219492450U (en) | 2023-03-20 | 2023-03-20 | Entrance door structure and water turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219492450U (en) |
-
2023
- 2023-03-20 CN CN202320545399.6U patent/CN219492450U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN219492450U (en) | Entrance door structure and water turbine | |
| CN208734108U (en) | A kind of fixture type edge protection railing support | |
| CN209040202U (en) | One kind is intelligent to open pressure-regulating fire hydrant fastly | |
| CN204126003U (en) | The comprehensive interim waterworks for firefighting of a kind of packaged type | |
| CN206088792U (en) | Large -scale equipment belt double -screw bolt crowd flange passes through guiding orientation of bolt hole group device | |
| CN209620895U (en) | A kind of low-voltage platform area anti-electricity-theft device | |
| CN210033701U (en) | Slow-opening protection device for hydroelectric generating set flow passage entrance door | |
| CN219344894U (en) | Fire pump convenient to maintain | |
| CN210128008U (en) | Bolt shear connector with weakened section | |
| CN208417733U (en) | A kind of high pressure water aperture valve conversion equipment | |
| CN212672471U (en) | Horizontal full-bore bidirectional eccentric half-ball valve | |
| CN216447497U (en) | Volute or ball valve entrance door structure | |
| CN219605260U (en) | Synergistic composite perforating device | |
| JP2783486B2 (en) | Tank pressure maintenance method and chip tank | |
| CN219993822U (en) | Transmission structure of water guide mechanism of medium-and-small-sized mixed-flow unit | |
| CN203188247U (en) | Novel manhole cover with air-exhaust and flood-discharge sky window | |
| CN218761657U (en) | Butt welding type nuclear power automatic recirculation pump protection valve | |
| CN205577449U (en) | Building slope steel hangs and draws device | |
| CN219933201U (en) | Connection structure, support and hanger and pipeline installation assembly | |
| CN216379779U (en) | Constant-pressure water supply device for preventing frequent starting of water pump | |
| CN216253458U (en) | Controller for boiler room | |
| CN209367721U (en) | A kind of rear cover of Mine anchorage cable stretch-draw jack | |
| CN108397579A (en) | A kind of axial flow type check valve | |
| CN215635193U (en) | Overflow valve with automatic opening and closing function | |
| CN211172790U (en) | Protective fence for hanging hole |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |