CN111390497B - Method for manufacturing assembled water meter shell - Google Patents
Method for manufacturing assembled water meter shell Download PDFInfo
- Publication number
- CN111390497B CN111390497B CN201910945867.7A CN201910945867A CN111390497B CN 111390497 B CN111390497 B CN 111390497B CN 201910945867 A CN201910945867 A CN 201910945867A CN 111390497 B CN111390497 B CN 111390497B
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- guide plate
- body cavity
- water meter
- main body
- outward turning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
Abstract
The invention discloses a manufacturing method of an assembled water meter shell, which comprises the following steps: processing an inlet and outlet flow passage on a stainless steel blank of a main body cavity assembled into a type water meter shell through an internal high-pressure expansion extrusion forming process or a mechanical punch forming process from inside to outside; step two, assembling a core step, an outward turning guide plate and a water baffle in the main body cavity; and step three, assembling connecting pieces on the inlet and outlet flow passages. The invention adopts the mode of assembling and molding parts to complete the manufacture of the water meter shell. The manufacturing method does not relate to a casting process, has simpler manufacturing process, does not change the material per se, can completely ensure the highest requirement on the drinking wading material, can be repeatedly used, and does not cause any environmental pollution. The water meter shell manufactured by the method has the advantages of low cost, high production efficiency, suitability for mass rapid manufacturing and the like.
Description
Technical Field
The invention relates to a metering device, in particular to a manufacturing method of an assembled water meter shell.
Background
There are four materials currently on the market for water meter housings: cast iron, copper alloy, high-strength plastic and stainless steel, and the other three metals except the plastic watchcase are almost all formed by casting or red punching. The invention with the publication number of CN106496785A is specially used for 3, 15 in 2017, and discloses a casting method of a corrosion-resistant water meter shell, which comprises the following steps: polypropylene, glass fiber, an auxiliary agent, toner, an antioxidant, an ultraviolet-resistant absorbent, silicon carbide and polytetrafluoroethylene are uniformly mixed with each other; melting, mixing, drawing strips, making materials, and cutting into granules to form the final blend composite material; putting liquid aluminum into the casting cavity and keeping the liquid state of the aluminum; heating and melting the blend composite material by an injection molding machine, immediately putting the blend composite material into a casting cavity containing liquid aluminum, uniformly stirring, and cooling and shaping to obtain the corrosion-resistant water meter shell; the invention combines metal and plastic, and adopts the combination of casting and injection molding, so that the manufactured water meter shell not only has the rigidity of metal, but also has the flexibility of plastic, and has better corrosion resistance.
It is known that the casting process, whatever it has, has the following drawbacks: firstly, the process is complex; secondly, the manufacturing environment is severe, which has serious influence on air, surrounding environment, manufacturing field and staff; thirdly, the cost is high; fourthly, the components of the watchcase material are difficult to control, and particularly, precipitates are unstable, so that new pollution is caused to tap water in a pipeline, and the health of a human body is influenced.
In addition, a production process adopting a stainless steel plate stamping and welding method is available in the market, and the production process has long production flow and low efficiency, so that the mass production cannot be realized for a long time. Moreover, the components of the materials at the welding position and around the welding position are changed by reaction with oxygen in the air after being heated, so that corrosion is easy to occur, and sand holes and water leakage are caused, or a new tap water pollution source is caused. In addition, once welding is adopted, electrolysis treatment is required, and the electrolysis process is the main cause of extreme damage to the ecological environment and is a severely controlled process in China.
Therefore, practitioners in the field still need to continuously improve the manufacturing process of the water meter shell, so that the manufacturing process of the water meter shell is simpler and easier, safer and more environment-friendly, and the product quality is better.
Disclosure of Invention
The invention provides a method for manufacturing an assembled water meter shell, which is simpler, easier, safer, more environment-friendly, more economical and more beneficial to ensuring the product quality, and aims to overcome the defects that the existing method for manufacturing the water meter shell is complex in process, not environment-friendly and high in cost and is not beneficial to maintaining the stable product quality.
The technical scheme of the invention is as follows: a manufacturing method of an assembled water meter shell comprises the following steps:
processing an inlet and outlet flow channel on a stainless steel blank of a main body cavity of an assembled water meter shell by an internal high-pressure expansion extrusion forming process or a mechanical punch forming process from inside to outside;
step two, assembling a core step, an outward turning guide plate and a water baffle in the main body cavity;
and step three, assembling connecting pieces on the inlet and outlet flow passages.
The manufacturing method of the assembly-forming water meter shell adopts a mode of assembling and forming parts to complete the manufacturing of the water meter shell. The manufacturing method does not relate to a casting process, has simpler manufacturing process, does not change the material per se, can completely ensure the highest requirement on the drinking wading material, can be repeatedly used, and does not cause any environmental pollution. The water meter shell manufactured by the method has the advantages of low cost, high production efficiency, suitability for mass rapid manufacturing and the like.
Preferably, the blank of the main body cavity in the first step is tubular, and the shell bottom is assembled on the lower opening of the main body cavity after the third step. The tubular blank is easy to obtain in the market, the cost is lower, the main body cavity formed by expanding and extruding the tubular blank is lack of the bottom, and the complete main body cavity can be formed by assembling the shell bottom on the lower opening of the main body cavity. Therefore, the manufacturing method can reduce the production cost.
Preferably, the core step, the eversion guide plate and the water baffle are of an integrally formed structure, and in the second step, the combination of the core step, the eversion guide plate and the water baffle is supported on the upper port of the shell bottom and is tightly matched in the main body cavity. The movement step, the outward turning guide plate and the water baffle are integrally formed and can be assembled in the main body cavity as a whole, so that the assembling steps are reduced, and the assembling difficulty is reduced. The shell bottom is matched with the main body cavity and then forms a step structure with the inner wall of the main body cavity, and the step structure can support the combination of the step of the machine core, the outward turning guide plate and the water baffle plate, so that the combination of the step of the machine core, the outward turning guide plate and the water baffle plate is more firmly installed in the main body cavity.
And in the second step, the combination of the step of the machine core, the everting guide plate and the water baffle is welded in the cavity of the main body. The assembly of the step, the eversion guide plate and the water baffle of the machine core can be conveniently installed in the cavity of the main body by adopting a welding mode.
And in the second step, the combination of the core step, the everting guide plate and the water baffle is tightly matched in the main body cavity, and the outer wall of the main body cavity is extruded at a fixed point to form an inner recess so as to strengthen the tight fit. The outer wall of the main body cavity is extruded, and the formed concave structure can play an axial limiting role, so that the close-fitting installation of the combination of the step of the core, the everting guide plate and the water baffle in the main body cavity is strengthened.
As an alternative, the core step, the outward turning guide plate and the water baffle are of an integrally formed structure, an inner folded edge is arranged at the upper end opening of the main body cavity, and the top end of the combination of the core step, the outward turning guide plate and the water baffle is propped against the inner folded edge. The lower end face of the inner folded edge of the main body cavity is abutted to the top of the combination of the core step, the outward turning guide plate and the water baffle plate, so that the combination of the core step, the outward turning guide plate and the water baffle plate can be supported and positioned, and meanwhile, the problem that the inner folded edge deforms downwards under strong extrusion to cause the phenomenon of water leakage due to poor sealing is effectively solved.
Preferably, the combination body of the movement step, the eversion guide plate and the water baffle is processed by tubular materials. The tubular material is relatively common, is easy to obtain in the market, has lower cost, and can simplify the production process and reduce the production cost by processing the assembly of the machine core step, the everting guide plate and the water baffle by using the tubular material.
Preferably, the processing of the assembly of the movement step, the eversion guide plate and the water baffle comprises the following steps:
taking one tubular material, and carrying out waisting treatment on the middle section of the tubular material;
then extruding two ends of the tubular material, and pressing the waist-contracting part into a double layer which is overlapped together to form the step of the movement;
Respectively punching a pair of inner flow passages which are opposite in position from the tubular material along the radial direction;
and (3) punching the notch adhesive material on one side of one end and punching the notch adhesive material on the other side of the other end to bend outwards, and welding the free end of the outwards-bent half-side tubular material on the inner wall of the inlet/outlet flow passage.
The processing method can finish the processing of the combination of the step of the machine core, the eversion guide plate and the water baffle only by using a single tubular material, and has simple and economic process.
As an alternative, the processing of the combination of the step of the movement, the eversion guide plate and the water baffle comprises the following steps:
taking two tubular materials, and respectively carrying out whole-circumference punching and edge folding processing on one end port of each of the two tubular materials;
overlapping and attaching the port folded edges of the two tubular materials, and axially punching from two sides of the port folded edges to press the overlapped port folded edges to form the machine core step;
respectively punching a pair of inner flow passages opposite to each other in the radial direction on the two tubular materials;
and punching the incision adhesive material on one side of one end and punching the incision adhesive material on the other side of the other end, turning up and bending, and welding the free end of the turning up and bending half-side tubular material on the inner wall of the inlet/outlet flow passage.
The processing method can also finish the processing of the combination of the step of the machine core, the eversion guide plate and the water baffle by using two tubular materials, and has simple and economic process.
Preferably, the root of each inlet/outlet flow passage in the second step is half-circumferentially depressed, and the depressed side and the adjacent eversion guide plate are positioned on the same side of the longitudinal section of the inlet/outlet flow passage. After half cycle indentation processing, the part of the fluid channel forms a convex cambered surface and is connected with the eversion guide plate to form a flow guide surface, so that the guide effect of the fluid channel is ensured, the pressure loss is reduced, and the metering stability is improved.
Preferably, the connecting piece is connected with the inlet and outlet flow passages through one or more of bonding, screw connection and the like. The connecting piece is connected with the inlet and outlet flow passages in the modes, precision welding and sealing are not needed, the process is simple, the sealing performance is good, the strength is guaranteed, and materials are saved.
Preferably, the shell bottom and the lower opening of the main body cavity are connected by one or more of bonding, screw connection and the like. The shell bottom and the main body cavity are connected in the modes, precision welding and sealing are not needed, the process is simple, the sealing performance is good, the strength is guaranteed, and materials are saved.
The invention has the beneficial effects that:
the process is simple, and the production efficiency is improved. The water meter shell is manufactured by adopting a part assembly forming mode, and compared with a common casting process, the process is simpler, the production efficiency is higher, and the cost is lower.
Is safe and environment-friendly. The invention has no change to the material, can completely ensure the highest requirement to the drinking water wading material, can be repeatedly used and can not cause any environmental pollution.
Drawings
FIG. 1 is a schematic view of a water meter housing made by the present invention;
FIG. 2 is a schematic structural view of a water meter case in embodiment 1;
FIG. 3 is a schematic structural view of a water meter case according to embodiment 2;
FIG. 4 is a schematic structural view of a water meter case according to embodiment 3;
FIG. 5 is a schematic structural view of a combination of the movement step, the eversion baffle and the water baffle of the present invention;
FIG. 6 is a schematic view of a process step of the assembly of the deck step, eversion baffle and breakwater of the present invention;
FIG. 7 is a schematic view of another process step of the combination of the deck step, the eversion baffle and the breakwater of the present invention;
FIG. 8 is a schematic structural view of a water meter case according to embodiment 5;
FIG. 9 is a schematic structural view of a water meter case according to embodiment 7;
FIG. 10 is a schematic structural view of a water meter case according to embodiment 8;
fig. 11 is a schematic structural view of a water meter case in embodiment 9.
In the figure, 1-a main body cavity, 2-an inlet and outlet flow passage, 3-a machine core step, 4-an eversion guide plate, 5-a connecting piece, 6-a shell bottom, 7-an inner flow passage, 8-a water baffle and 9-an inner convex ring.
Detailed Description
The invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings.
Example 1:
as shown in fig. 1, 2, 5 and 6, a method for manufacturing an assembled water meter case includes the following steps:
processing two opposite inlet and outlet runners 2 on a blank of a main body cavity 1 of an assembled water meter shell by an internal high-pressure expansion extrusion forming process or a mechanical punch forming process from inside to outside, wherein one runner is a water inlet runner, the other runner is a water outlet runner, and the blank of the main body cavity 1 is tubular;
secondly, assembling a core step 3, an outward turning guide plate 4 and a water baffle 8 in the main body cavity 1 in a forced extrusion and butt welding mode;
assembling a connecting piece 5 on the inlet and outlet flow passage 2, wherein the water inlet flow passage is connected with the connecting piece 5 in a tight fit, gluing and butt welding composite connection mode, and the water outlet flow passage is connected with the connecting piece 5 in a threaded connection mode;
and step four, assembling a shell bottom 6 on the lower opening of the main body cavity 1, and connecting the shell bottom 6 with the lower opening of the main body cavity 1 in a threaded connection mode.
The core step 3, the eversion guide plate 4 and the water baffle 8 are of an integrally formed structure, and in the step two, the combination of the core step 3, the eversion guide plate 4 and the water baffle 8 is supported on the upper port of the shell bottom 6 and is tightly matched in the main body cavity 1. The combination body of the movement step 3, the eversion guide plate 4 and the water baffle 8 is processed by tubular materials. The processing of the combination of the movement step 3, the eversion guide plate 4 and the water baffle 8 comprises the following steps:
A. Taking one tubular material, and carrying out waisting treatment on the middle section of the tubular material;
B. then extruding two ends of the tubular material, and pressing the waist-contracting part into a double layer which is overlapped together to form the step of the movement;
C. respectively punching a pair of inner flow passages 7 which are opposite to each other in the radial direction from the tubular material;
D. bending the cut adhesive material punched on one side of one end and the cut adhesive material punched on the other side of the other end in an outward turning way, and butt-welding the free end of the half-tubular material bent in the outward turning way on the inner wall of the inlet and outlet flow passage 2;
after the water meter shell is manufactured according to the steps, the main body cavity 1 is divided into two cavities which are communicated with the two inlet and outlet flow passages 2 in a one-to-one correspondence mode. After the movement is arranged on the central hole of the movement step 3, the two chambers are communicated only through the movement.
Example 2:
as shown in FIG. 3, the outer wall of the top end of the main body cavity 1 is extruded to form an indent, and an inner convex ring 9 is correspondingly formed on the inner wall of the main body cavity 1. The combination of the core step 3, the eversion guide plate 4 and the water baffle 8 is assembled in the main body cavity 1 in a mode of being clamped with the inner convex ring 9 after being extruded by force, and the upper end port of the combination of the core step 3, the eversion guide plate 4 and the water baffle 8 is abutted against the lower end face of the inner convex ring 9 to form clamping, so that the axial positioning can be enhanced. The rest is the same as example 1.
Example 3:
as shown in fig. 4, the connecting member 5 is integrally formed with the inlet/outlet flow passage 2. The rest is the same as example 1.
Example 4:
as shown in fig. 7, the processing of the assembly of the movement step 3, the eversion baffle 4 and the water baffle 8 comprises the following steps:
A. taking two tubular materials, and respectively carrying out whole-circumference punching and edge folding processing on one end port of each of the two tubular materials;
B. coaxially aligning two tubular materials, overlapping and fitting respective port folded edges, axially punching from two sides of the port folded edges to press and weld the overlapped port folded edges to form a machine core step 3;
C. respectively punching a pair of inner flow passages 7 opposite to each other in the radial direction on the two tubular materials;
D. and punching an incision adhesive material on one side of one end and punching an incision adhesive material on the other side of the other end to bend outwards, and butt-welding the free end of the outwards-bent half-side tubular material on the inner wall of the inlet/outlet flow passage 2.
The rest is the same as example 1.
Example 5:
as shown in fig. 8, the root of each inlet/outlet flow passage 2 is depressed by half a circle, the adjacent outward turning baffle 4 is also punched into an outward convex arc shape, and the depressed half circle and the adjacent outward turning baffle 4 are positioned on the same side of the longitudinal section of the inlet/outlet flow passage 2. The rest is the same as example 2.
Example 6:
the upper port of the main body cavity 1 is provided with an inner folded edge 10, and the top end of the combination of the machine core step 3, the outward turning guide plate 4 and the water baffle plate 8 is propped against the inner folded edge 10. The rest is the same as example 5.
Example 7:
as shown in figure 9, the upper end of the combination of the core step 3, the eversion guide plate 4 and the water baffle plate 8 is provided with a necking, the port of the necking is propped against the inner folded edge 10, and the step at the root of the necking is propped against the inner convex ring 9 of the main body cavity 1. The rest is the same as example 6.
Example 8:
as shown in fig. 10, the core step 3 and the water baffle 8 are in a split structure without the outward turning guide plate 4, the periphery of the water baffle 8 is provided with an inclined guide surface, the water baffle 8 is in a semi-annular shape, and the core step 3 and the water baffle 8 are both in forced tight fit with the main body cavity 1. The rest is the same as example 1.
Example 9:
as shown in fig. 11, the main body cavity 1, the shell bottom 6 and the inlet/outlet runner 2 are formed by internal high-pressure extrusion with a pot-shaped blank. The rest is the same as example 6.
Example 10:
the connecting piece 5 is connected with the inlet and outlet flow passage 2 in a composite connection mode of tight fit and gluing adhesion. The rest is the same as example 1.
Example 11:
the connecting piece 5 is connected with the inlet and outlet flow passage 2 in a single tight fit mode. The rest is the same as example 1.
Example 12:
The connecting piece 5 is connected with the inlet and outlet flow passage 2 in a single mode of bonding. The rest is the same as example 1.
Example 13:
the connecting piece 5 is connected with the inlet and outlet flow passage 2 in a threaded connection mode. The rest is the same as example 1.
Example 14:
the combination of the core step 3, the outward turning guide plate 4 and the water baffle 8 is formed by flat plate roll welding. The rest is the same as example 1.
Claims (8)
1. The manufacturing method of the assembled water meter shell is characterized by comprising the following steps:
processing an inlet and outlet runner (2) on a blank of a main body cavity (1) assembled into a type water meter shell by an internal high-pressure expansion extrusion forming process or a mechanical punch forming process from inside to outside;
secondly, assembling a machine core step (3), an outward turning guide plate (4) and a water baffle (8) in the main body cavity (1), and processing a combination of the machine core step (3), the outward turning guide plate (4) and the water baffle (8) by using a tubular material;
the processing of the combination of the movement step (3), the eversion guide plate (4) and the water baffle (8) comprises the following steps:
taking one tubular material, and carrying out waisting treatment on the middle section of the tubular material;
then extruding two ends of the tubular material, and pressing the waist-contracting part into a double layer which is overlapped together to form the step of the movement;
Respectively punching a pair of inner flow passages (7) which are opposite to each other in the radial direction from the tubular material;
bending the cut adhesive material punched on one side of one end and the cut adhesive material punched on the other side of the other end in an outward turning way, and welding the free end of the half-pipe-shaped material bent in the outward turning way on the inner wall of the inlet and outlet flow passage (2);
or the processing of the combination of the movement step (3), the eversion guide plate (4) and the water baffle (8) comprises the following steps:
taking two tubular materials, and respectively carrying out whole-circumference punching and edge folding processing on one end port of each of the two tubular materials;
overlapping and attaching the port folded edges of the two tubular materials, and axially punching from two sides of the port folded edges to press the overlapped port folded edges to form the machine core step;
respectively punching a pair of inner flow passages (7) opposite to each other in the radial direction on the two tubular materials;
bending the cut adhesive material punched on one side of one end and the cut adhesive material punched on the other side of the other end in an outward turning way, and welding the free end of the half-pipe-shaped material bent in the outward turning way on the inner wall of the inlet and outlet flow passage (2);
and step three, assembling a connecting piece (5) on the inlet and outlet flow passage (2).
2. The method for manufacturing an assembled water meter case according to claim 1, wherein the blank of the body cavity (1) in the first step is tubular, and the case bottom (6) is assembled on the lower opening of the body cavity (1) after the third step.
3. The manufacturing method of the assembled water meter shell according to claim 2, wherein the movement step (3), the outward turning guide plate (4) and the water baffle (8) are of an integrally formed structure, and in the second step, the bottom end of the assembly of the movement step (3), the outward turning guide plate (4) and the water baffle (8) is supported on the upper port of the shell bottom (6) and is tightly fitted in the main body cavity (1).
4. The manufacturing method of the assembled water meter shell according to claim 1, wherein the movement step (3), the outward turning guide plate (4) and the water baffle (8) are of an integrally formed structure, in the second step, the assembly of the movement step (3), the outward turning guide plate (4) and the water baffle (8) is tightly fitted in the main body cavity (1), and the outer wall of the main body cavity (1) is extruded at a fixed point to form an indent so as to strengthen tight fitting.
5. The manufacturing method of the assembled water meter shell according to claim 1, wherein the core step (3), the outward turning guide plate (4) and the water baffle (8) are of an integrally formed structure, in the second step, the combination of the core step (3), the outward turning guide plate (4) and the water baffle (8) is tightly assembled in the main body cavity (1), the upper port of the main body cavity (1) is provided with an inner folded edge (10), and the top end of the combination of the core step (3), the outward turning guide plate (4) and the water baffle (8) is propped against the inner folded edge (10).
6. The method for manufacturing an assembled type water meter case according to any one of claims 1 to 5, wherein the root of each inlet/outlet flow passage (2) is depressed at one side, and the depressed side and the adjacent eversion baffle (4) are located on the same side of the longitudinal section of the inlet/outlet flow passage (2).
7. The method for manufacturing an assembled water meter case according to any one of claims 1 to 5, wherein the connecting member (5) is connected to the inlet/outlet flow passage (2) by one or more of bonding and screwing.
8. The method for manufacturing the assembly-type water meter shell as claimed in claim 2 or 3, wherein the shell bottom (6) is connected with the lower opening of the main body cavity (1) through one or more of bonding and screw connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910945867.7A CN111390497B (en) | 2019-09-30 | 2019-09-30 | Method for manufacturing assembled water meter shell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910945867.7A CN111390497B (en) | 2019-09-30 | 2019-09-30 | Method for manufacturing assembled water meter shell |
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| Publication Number | Publication Date |
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| CN111390497A CN111390497A (en) | 2020-07-10 |
| CN111390497B true CN111390497B (en) | 2022-06-10 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1283783A (en) * | 2000-09-14 | 2001-02-14 | 梁世良 | Shell of water flowmeter and its manufacture |
| CN2711700Y (en) * | 2004-06-16 | 2005-07-20 | 孙增国 | Water meter |
| CN101067567A (en) * | 2007-05-21 | 2007-11-07 | 袁瑗 | Metal plate water meter casing forming technology |
| KR20100097772A (en) * | 2009-02-27 | 2010-09-06 | 방병민 | Dual warm water meter |
| WO2011020291A1 (en) * | 2009-08-15 | 2011-02-24 | 江西三川水表股份有限公司 | Water meter casing and manufacturing process thereof |
| CN102138062A (en) * | 2009-08-15 | 2011-07-27 | 江西三川水表股份有限公司 | Water meter casing and manufacturing process thereof |
| CN108759968A (en) * | 2018-08-13 | 2018-11-06 | 三川智慧科技股份有限公司 | A kind of two halves formula assembly water meter case and its processing method |
| CN109932006A (en) * | 2019-04-19 | 2019-06-25 | 宁波宁水仪表有限公司 | A kind of water meter case |
-
2019
- 2019-09-30 CN CN201910945867.7A patent/CN111390497B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1283783A (en) * | 2000-09-14 | 2001-02-14 | 梁世良 | Shell of water flowmeter and its manufacture |
| CN2711700Y (en) * | 2004-06-16 | 2005-07-20 | 孙增国 | Water meter |
| CN101067567A (en) * | 2007-05-21 | 2007-11-07 | 袁瑗 | Metal plate water meter casing forming technology |
| KR20100097772A (en) * | 2009-02-27 | 2010-09-06 | 방병민 | Dual warm water meter |
| WO2011020291A1 (en) * | 2009-08-15 | 2011-02-24 | 江西三川水表股份有限公司 | Water meter casing and manufacturing process thereof |
| CN102138062A (en) * | 2009-08-15 | 2011-07-27 | 江西三川水表股份有限公司 | Water meter casing and manufacturing process thereof |
| CN108759968A (en) * | 2018-08-13 | 2018-11-06 | 三川智慧科技股份有限公司 | A kind of two halves formula assembly water meter case and its processing method |
| CN109932006A (en) * | 2019-04-19 | 2019-06-25 | 宁波宁水仪表有限公司 | A kind of water meter case |
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| Publication number | Publication date |
|---|---|
| CN111390497A (en) | 2020-07-10 |
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