WO2020020112A1

WO2020020112A1 - Water meter case and processing method therefor

Info

Publication number: WO2020020112A1
Application number: PCT/CN2019/097166
Authority: WO
Inventors: 朱春冬; 王裕丹
Original assignee: 浙江优立普计量科技有限公司
Priority date: 2018-07-23
Filing date: 2019-07-22
Publication date: 2020-01-30

Abstract

A water meter case using a split-type structure, wherein the case is divided into two parts and then is formed as a whole by means of welding; an inner ring (2) used for fixing a movement, is positioned by means of providing, in a case body, an inner ring positioning mechanism which can position the inner ring (2), and is also fixed inside the case body by means of welding, thereby forming the water meter case. Further provided is a method for processing the water meter case. Compared with traditional casting methods, materials used in this method are more environmentally friendly, have a lower energy consumption, and can also be recycled, and the device used and lower production costs facilitate large-scale promotion.

Description

Water meter case and processing method thereof

Technical field

The invention belongs to the technical field of water meters, and particularly relates to a water meter housing and a processing method thereof.

Background technique

Water meters are meters that measure water flow. Most of them are cumulative water flow measurements. They are generally divided into volumetric water meters and speed meters. For traditional water meters, the shell is often cast from iron or copper to obtain the blank, and then through CNC cutting and surface treatment to obtain the final shell finished product, which becomes available after the movement is installed inside. Water meter. For this type of water meter, GB / T778.1-2007 Measurement of water flow in a closed full pipe. Drinking cold water meter and hot water meter. Part 1: The specifications specify the technical characteristics of each type of water meter, and for each type of each The water meter caliber and overall size of the model water meter have detailed regulations, so that water meters from different manufacturers can be used universally.

In the existing production technology, most of the shell is made of iron or copper after smelting to obtain the blank. In this regard, there are the following problems: First, due to the limitation of the shell structure and casting process, the general shell The thinnest thickness also needs to reach 5-8cm, which will cause the production of the casing to consume a large amount of iron or copper, and due to its thickness, the casing and the water meter will also have a larger weight, which is not conducive to production , Transportation and installation. Secondly, the casting method needs to first smelt iron or copper to a liquid state, which will cause extremely high energy consumption for its production, consume a lot of energy and generate a lot of greenhouse gases, which is also unfriendly to the environment. Thirdly, because the water meter needs to be in contact with the water source for a long time, the nature of the two substances, iron and copper, determines that after long-term contact with the water, chemical reactions will occur and affect the water quality, which is not good for the use of the water meter and its life . Finally, based on water safety considerations, regulations require that water meters be replaced after a period of use. Traditional iron and copper water meters need to be dismantled, treated slightly, and then returned to the melting furnace as an iron and copper source for recasting. This regeneration method is not only costly, but also not environmentally friendly.

Therefore, there is an urgent need for a new water meter case manufacturing process with safer materials and lower production and processing costs. The Chinese Patent Publication No. CN103542907A discloses an environmentally-friendly high-precision stainless steel water meter and its preparation method. Chinese patent No. CN105181060A discloses a high-strength and long-life stainless steel water meter and a method for preparing the same. Both patent documents disclose water meter processing methods using stainless materials as raw materials, but they are mainly manufactured by laser welding. The method of connecting the various components has a very expensive equipment cost, which leads to high production costs and is not conducive to large-scale industrial production. Moreover, the performance parameters and product stability of the finished casing have not reached a reasonable level of commercialization. .

Summary of the Invention

The purpose of the present invention is to provide a water meter case with controllable processing equipment cost, easy control of processing technology, high structural performance and yield, and safe material, and a method for processing the water meter case.

As a first object of the present invention, an object of the present invention is to provide a water meter case, which innovatively adopts a split structure, divides the case into two parts and forms a whole by welding; the inner part for the fixed movement The ring is positioned by an inner ring positioning mechanism capable of positioning the inner ring in the housing body, and is also fixed in the housing body by welding. Thus, the water meter case of the present invention is formed.

In addition, the present invention also specifically provides three preferred implementation modes of the inner ring positioning mechanism. For the above-mentioned split specific splitting methods, three feasible solutions are also provided; of course, in each splitting method, symmetrical splitting is not necessarily required.

Considering that some alloy materials with specific content impurities often have an unfixed melting point, the general welding method may make the sealing at the weld seam or the structural strength unsatisfactory; the invention also provides a water meter housing structure with overlapping edges Through this structure, furnace welding can be made possible, thereby solving the above-mentioned problems.

As a second aspect of the present invention, the purpose is to provide the above-mentioned method of processing a water meter case, that is, a process; it mainly includes steps of disassembling, stamping, processing, assembling, and welding the components, thereby realizing the processing of the water meter case. Manufacturing.

The processing method of the present invention creatively divides the water meter case into a first case piece and a second case piece in a symmetrical or asymmetrical dividing manner, and uses hydraulic cold punching to punch / stretch and form Obtain the main parts; for the fixed inner ring of the movement necessary for the water meter case, separately punch or process it as a separate part, and press the corresponding inner ring for positioning at the corresponding position on the first and second case pieces. Mechanism, so that it can be easily and accurately installed at the design position during assembly; supplemented with an auxiliary brace to increase the thickness at each interface, and methods of spot welding, girth welding and furnace welding, so that the present invention The parameters such as the specifications of the interface, the dimensions of the core cavity and other parameters made by the processing method meet the requirements of laws and regulations, and can be used with other existing water meter parts or water pipe interfaces. Of course, the interface types can be DN15, DN20, DN25, DN40, etc. (refers to the inner diameter of the pipeline). More importantly, this processing method mainly uses hydraulic cold stamping processing, supplemented by NC cutting and welding molding. Compared with the traditional casting method, its raw materials are more environmentally friendly, lower energy consumption, and can be recycled. Compared with the new type of laser welding, its structure is more reasonable, its compressive strength is higher, and the equipment and production costs used are lower, which is conducive to large-scale promotion.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic structural diagram of a horizontal water meter case according to the present invention;

FIG. 2 is an exploded view of the embodiment of FIG. 1; FIG.

FIG. 3 is a schematic structural diagram of a case piece in the embodiment of FIG. 1; FIG.

4 is a cross-sectional view of the housing piece of the embodiment of FIG. 3;

FIG. 5 is an inside front view of the housing sheet of the embodiment of FIG. 3; FIG.

6 is a schematic structural diagram of an inner ring of the embodiment of FIG. 1;

7 is a schematic structural diagram of an imported dental mouthpiece of the embodiment of FIG. 1;

FIG. 8 is a structural schematic diagram of the mouth shell mouth guard of the embodiment of FIG. 1

FIG. 9 is a schematic diagram of cooperation between a certain shell piece and the inner ring in the embodiment of FIG. 1; FIG.

10 is a schematic structural diagram of a horizontal IC smart water meter case according to the present invention;

11 is an exploded view of the embodiment of FIG. 10;

FIG. 12 is a cross-sectional view of cooperation between a housing piece and a connecting rod valve bracket in the embodiment of FIG. 10; FIG.

FIG. 13 is an inside front view of a case piece of the embodiment of FIG. 10; FIG.

FIG. 14 is a schematic diagram of the cooperation between a certain housing piece and the inner ring in the embodiment of FIG. 10; FIG.

15 is a schematic structural diagram of a certain vertical water meter case according to the present invention;

16 is an exploded view of Embodiment 5 of FIG. 15;

FIG. 17 is a schematic structural diagram of a case piece in the embodiment of FIG. 15; FIG.

FIG. 18 is an inside front view of the first casing piece of the embodiment of FIG. 15; FIG.

19 is a schematic structural diagram of an inner ring of the embodiment of FIG. 15;

FIG. 20 is a schematic diagram of the cooperation between a certain housing piece and the inner ring in the embodiment of FIG. 15; FIG.

21 is a schematic view of a flat-cut structure of the embodiment of FIG. 1;

22 is a schematic view of a longitudinal cut structure of the embodiment of FIG. 1;

23 is a schematic view of a flat-cut structure of the embodiment of FIG. 15;

24 is a schematic structural diagram of another horizontal water meter case according to the present invention;

25 is an exploded view of the embodiment of FIG. 24;

FIG. 26 is a schematic cooperation diagram of the embodiment of FIG. 24; FIG.

FIG. 27 is a schematic structural diagram of a case piece in the embodiment of FIG. 24; FIG.

FIG. 28 is a schematic diagram of an inner ring structure of the embodiment of FIG. 24; FIG.

FIG. 29 is a schematic structural diagram of an inner ring positioning mechanism of FIG. 24; FIG.

FIG. 30 is a schematic structural diagram of a case piece in the embodiment of FIG. 29; FIG.

FIG. 31a is a schematic structural diagram of a joint between two shell pieces; FIG.

31b is a schematic structural diagram of a lap edge of the present invention;

FIG. 31c is a schematic diagram of cooperation using the overlapping edge of FIG. 31b;

FIG. 31d is a schematic diagram of a second fitting method using the overlapping edge of FIG. 31b; FIG.

FIG. 31e is a schematic diagram of a third type of fitting using the overlapping edge of FIG. 31b; FIG.

FIG. 32 is a schematic structural diagram of the embodiment of FIG. 24 after an overlap edge is added; FIG.

FIG. 33 is a schematic structural diagram of a certain case and a partially enlarged view of another case having overlapping edges; FIG.

34a is a schematic structural diagram of a vertical water meter according to the present invention, which uses an inner ring positioning mechanism of a step + clamping portion;

FIG. 34b is a schematic structural diagram of main components in the embodiment of FIG. 13a; FIG.

FIG. 34c is an exploded schematic diagram of the embodiment of FIG. 34a using a flat cutting method;

35 is a schematic structural diagram of an inner ring with a folded edge according to an embodiment of the present invention;

FIG. 36 is a cross-sectional view of cooperation between the inner ring and the housing body of the embodiment of FIG. 35; FIG.

FIG. 37 is a schematic diagram of cooperation between the inner ring with a folded edge and the shell according to another embodiment of the present invention; FIG.

FIG. 38 is a schematic diagram of an inner ring structure of the embodiment of FIG. 37; FIG.

FIG. 39 is a schematic flowchart of an additive method according to the present invention.

detailed description

In order to better understand the present invention, thereby making the scope of the present invention more clearly defined, the following describes the present invention in detail with reference to certain specific embodiments of the present invention for reference.

A water meter case is mainly composed of a first case piece 11, a second case piece 12, an inner ring 2 and a dental mouthpiece 3. The first case piece 11 and the second case piece 12 cooperate to form a water meter case. The main body structure of the body (that is, the main body of the body), the main body of the main body is formed with a cavity for accommodating the measuring movement, a meter port 16 for the installation and fixing of the movement, and a water inlet and outlet for water in and out. A water inlet; a water inlet channel 14 and a water outlet channel 15 are also provided in the main body of the housing. The water inlet channel 14 communicates with the water inlet and the chamber, and the water outlet channel 15 communicates with the water outlet and the chamber.

An inner ring positioning mechanism for positioning the inner ring 2 in the cavity is also provided on at least one of the first shell piece 11 and the second shell piece 12, and the inner ring positioning mechanism is fitted to at least a part of the inner ring 2 And make the position of the inner ring 2 in the cavity after the positioning conform to the parameter preset; so that the inner ring 2 can be welded and fixed in the cavity based on the positioning. Of course, it is optimal if the inner ring positioning mechanism also has a fixed or fixed function to a certain extent. In other words, the inner ring positioning mechanism is mainly used for positioning the inner ring 2 in the cavity, so that the inner ring 2 can be further welded and fixed in the cavity through spot welding, furnace welding, and the like; at the same time, to increase the welding strength of the inner ring 2 , The structure of the inner ring positioning mechanism may be further designed so that it has a corresponding fixed function, such as a form of a slot 21.

After the inner ring 2 fits into the chamber, it is divided into an upper chamber 102 and a lower chamber 101, and the upper chamber 102 and the lower chamber 101 are communicated with the water inlet channel 14 and the water outlet channel 15, respectively; There is also a movement hole 21 for setting the movement for measurement. During the measurement, the water flow enters the water meter from the water inlet and flows through the water inlet channel 14, the lower chamber 101, the movement (core hole 21), the upper chamber 102, and the water outlet channel 15 in order to achieve the measurement of the amount of water.

The dental mouthpiece 3 may include any or all of an inlet dental mouthpiece 31, an outlet dental mouthpiece 32, and a surface mouth dental mouthpiece 33, which are respectively fitted at the water inlet, the water outlet and the first casing piece 11 and the second casing piece 12 after being mated. At the mouth of the table, the thickness at each mouth can be increased without increasing the overall thickness, which is beneficial to reducing costs and balancing performance. The inlet braces 31, the outlet braces 32, and the housing mouth braces 33 are all hollow cylindrical structures, and a boss 34 is provided at the outer end.

Due to the limitation of the structure of the water meter, the level between the inner ring of the water meter housing and the meter mouth (that is, the two planes are parallel) is required. Therefore, the inner ring positioning mechanism is preferably configured such that the inner ring 2 is horizontal or substantially equal to the meter mouth 16. Level (that is, the error is small, so that the two can be leveled through simple machining by CNC cutting, that is, meeting the requirements of the water meter).

The above-mentioned components such as the first housing sheet 11, the second housing sheet 12, the inner ring 2 and the dental mouthpiece may be stainless steel, copper (including copper, brass, etc., where brass contains different proportions of impurity elements depending on its specifications, Such as tin), other metals / alloys or plastics and other polymer materials. That is to say, the present invention is mainly directed to the structure of the water meter case, and there is no special limitation on the material. The existing materials can meet the requirements of the present invention. At the same time, the above welding is not limited to the traditional metal The welding also includes the thermal connection between polymer materials such as plastic.

For the above-mentioned inner ring positioning mechanism, all corresponding structures according to the above structure and function requirements can be applied. As an example, the following three ways are more preferable.

First, the inner ring positioning mechanism is an inner ring retaining groove 21. The inner ring retaining groove 21 is a groove provided on the inner wall of the housing body. The overall shape of the inner ring retaining groove 21 should match the inner ring 21 so that the inner ring 21 fits into the general requirements of the water meter. The width of the groove 21 should be able to accommodate the edge of the inner ring 21. The inner ring retaining groove 21 may be formed by stamping on the first housing piece 11 or the second housing piece 12, or may be formed by adding an inner wall by welding, snapping, or the like.

As shown in Figure 1-20, the inner ring retaining groove 21 is formed by punching out the first shell piece 11 and the second shell piece 12 outward, and the inner ring 2 is configured to be disposed in the cavity. And is fixed in the inner ring retaining groove 21, and the inner ring 2 is provided with a fixing hole 22 provided by the water meter movement; the fitting relationship between the inner ring 2 and the first housing piece 11 and the second housing piece 12 is It is configured such that the plane where the fixing hole 22 of the inner ring 2 is located is parallel to or substantially parallel to the plane where the housing mouth 16 is located.

Second, the inner ring positioning mechanism is composed of a step 221 and a locking portion 222. The step 221 is provided on the first casing piece 11 and the second casing piece 12 in a manner that is parallel or substantially parallel to the surface of the table. There are several, and each latching portion 222 is coplanar or substantially coplanar, and the plane where the karat portion 222 is also parallel or substantially parallel to the surface; and the distance between the step 221 and the latching portion 222 can accommodate Inner ring 2.

As shown in Figure 24-28, the positioning mechanism of the inner ring is composed of a step 221 and four latching portions 222, that is, two latching portions 222 and one half are provided on the first casing piece 11 and the second casing piece 12, respectively. Steps 221. Preferably, the step 221 and the latching portion 222 are both formed by punching the first case piece 11 or the second case piece 12 inward relative to other parts. Whether the step 221 and the locking portion 222 are above or below does not affect the positioning and subsequent fixing of the inner ring 2 by the inner ring positioning mechanism; it is preferable that the locking portion 222 is located above the step 221 as shown in the figure.

Third, the inner ring positioning mechanism is completely composed of the locking portion 222, that is, on the basis of the previous method, the step 221 is replaced with a plurality of locking portions 222; that is, the inner ring positioning mechanism is composed of two sets of upper and lower positions. The two positions of the two positions should be coplanar or substantially coplanar. The distance between the two sets of positions should also be able to accommodate the inner ring 2.

Figures 29 and 30 show the scheme of the inner ring positioning mechanism composed entirely of the latching portions 222. The upper and lower sets of latching portions each include four latching portions 222, and are divided into the first casing piece 11 and the second casing Tablet 12. The latching portion 222 is formed by press-molding the first case piece 11 or the second case piece 12 inward relative to other parts.

The above is the core structure of the water meter housing of the present invention. Obviously, the above structure can be applied to various types of water meters, and even for the same water meter, there can be several different divisions.

For example: Figures 1-9 show the structure of the present invention when applied to a general horizontal water meter housing. Figure 10-14 shows the schematic diagram of its application to the IC smart watch. At this time, the structure is generally consistent with the horizontal type. Only the connecting rod valve bracket 4 for valve fixed cooperation and the plastic part bracket for intelligent meter head fixing are added. 5. 15-20 shows a schematic structural diagram of the present invention when it is applied to a vertical water meter. It can be seen that the main structure and the positions of the water inlet and outlet and the directions of the water inlet and

outlet channels

14 and 15 are reset accordingly. In addition, a valve retaining slot 17 is also provided at a corresponding position on the inner wall of the water outlet channel 15 so that the connecting rod valve can be well fixed in the water outlet channel 15; more preferably, the valve retaining slot 17 is also It is formed by protruding outwards during stamping.

And in the above three embodiments, each water meter case is divided in a tangential manner, and Figs. 21-23 show other possible division manners, wherein Fig. 21 is a flat cut, Fig. 22 is a longitudinal cut, and Fig. 23 is Flat cut. It can be seen that, for the water meter case of the present invention, cutting, flat cutting, and longitudinal cutting are all feasible, and symmetrical cutting is not necessarily required, and corresponding minor modifications are also feasible on this basis.

In some embodiments of the horizontal water meter housing (including the general horizontal type and the smart IC water meter type), two ends of the inner ring 2 are respectively provided with an upper extension 23 and a lower extension 24, and the upper extension 23 and The lower extensions 24 are respectively fitted in the water inlet channel and the water outlet channel; the two extensions can serve as a guide, so that the water flow can smoothly enter the chamber for measurement, so as not to generate a vortex and affect the accuracy of the measurement.

For the inner ring positioning mechanism of the first structure (that is, the inner ring retaining groove 21), the inner ring retaining groove 21 needs to have a shape matching the inner ring 2, for example, when the inner ring 2 has the above-mentioned upper extension When the portion 23 and the lower extension portion 24 are formed, the inner ring retaining groove 21 should also be extended upward and downward accordingly.

For the inner ring positioning mechanism of the second and third structures (ie, the step 221 + the latching portion 222 or only the latching portion 222), both ends of the inner ring 2 may be provided with an upper extension 23 and a lower extension, respectively. 24. The upper extension portion 23 and the lower extension portion 24 are fitted in the water inlet channel and the water outlet channel, respectively; at least one of the upper extension portion 23 and the lower extension portion 24 is also provided with a water inlet channel or an inner wall of the water outlet channel. The ear 214, the inner ring positioning mechanism only positions the middle of the inner ring 2. That is, for these two structures, the two ends of the middle ring 2 are in contact with the inner wall of the housing through the ears 214 and are welded. The ear 214 can guide when the inner ring 2 is mated with the two shell pieces (that is, the small dimensional deviation of the two extensions can be compatible by its elastic deformation), and at the same time increase the contact area of the inner ring 2 and the inner wall of the shell. Thereby enhancing the welding effect of furnace welding.

Of course, the above-mentioned methods are not incompatible, and corresponding simple combinations can also be made on this basis. For example, in embodiments of the second and third structures, the corresponding positions on the inner wall of the housing are similar to the inner ring card. The extension groove of the position groove 21 is used for positioning and fixing the two extensions instead of the ear 214.

In other embodiments of the vertical water meter housing, the inner ring 2 is in the shape of a flat piece as a whole, the fixing hole 22 is provided at one end, and the other end is provided with a straight end 25;

For the first inner ring positioning mechanism (the inner ring retaining groove 21), the inner ring retaining grooves 21 provided on the inner walls of the first housing piece 11 and the second housing piece 12 should be on the same plane so that the inner ring The ring 2 can be firmly fixed in the first case piece 11 and the second case piece 12. For the second or third type of inner ring positioning mechanism (step 221 + latching portion 222 or only latching portion 222), it is also required to be coplanar or substantially coplanar, so that the inner ring 2 and the inner ring are fixed. Institutional matching.

In the above two types of embodiments, the inner ring 2 is further provided with a fixing hole 22 provided by the water meter movement, and the fixing hole 22 is provided between the upper extension 23 and the lower extension 24 or is opposite to the end 25 The other end. That is, presetting the movement fixing hole on the inner ring 2 and reducing the difficulty and workload of subsequent processing, which is suitable as a whole.

In other embodiments, in order to solve the welding problem of the shell of the alloy material with an indefinite melting point, at least one of the first shell sheet 11 and the second shell sheet 12 further includes an overlap edge 13, and the first shell The sheet 11 and the second shell sheet 12 cooperate to form a shell body through the overlapping edge 13; the overlapping edge 13 is composed of a bent portion 131 and an extended portion 132.

In the other embodiments that do not include the overlapping edge 13, the contact point between the two shell pieces is as shown in FIG. 31a. After the first shell piece 11 and the second shell piece 12 are brought close to each other, The seam is welded and fixed by argon arc welding, etc .; this is suitable for metals with fixed melting points such as stainless steel and copper, but for materials such as brass that do not have a fixed melting point, the welding temperature is difficult to control and lower The temperature can only melt low melting point tin, which basically can not achieve the effect of soldering. If the temperature is adjusted to melt copper, it will cause the melting point of tin to be significantly exceeded, so that it can also be welded, but in fact there will be a weld Trachoma, which affects the structural strength and tightness of the weld. The overlapping edge 13 is mainly designed to solve this problem.

Fig. 31b shows a schematic structural diagram of the above-mentioned overlap edge 13, and Figs. 31c, 31d, and 31e respectively show three types of welding schematic diagrams of the overlap edge 13; wherein Fig. 31c is a case sheet with the overlap edge 13 on one side On the other side, there is a schematic diagram of the mating on the other side. Figures 31d and 31e are schematic diagrams of the mating of the shells on both sides with overlapping edges 13 (the difference is that the structure of the overlapping edges 13 is slightly different); FIG. 33 shows the overall structure of the overlapping edge 13 when fitted to the water meter case, and the structure of the casing sheet, and the overlapping edge 13 is also shown in FIGS. 21 and 22. In addition, the black parts in Figs. 31c-e are schematic diagrams of metal glue.

Obviously, the overlapping edge 13 may be provided on only one case piece (that is, provided on the first case piece 11 or the second case piece 12), or on both case pieces (that is, provided on the first case piece at the same time). Case sheet 11 and second case sheet 12). For the former, the shell piece provided with the overlapping edge 13 is matched with the edge of the other shell piece, while for the latter, the overlapped edges of the two shell pieces are matched with each other; at the same time, the first For a case piece 11 and a second case piece 12, if the contact surfaces between the first case piece 11 and the second case piece 12 are independent, the above-mentioned way of setting the overlapping edge 13 may also be For each contact surface, not for each housing piece.

The overlap area 13 can increase the contact area between the two shell pieces (the first shell piece 11 and the second shell piece 12), so that on the one hand, some materials containing impurities (such as copper plates, including 59 copper) can be made. , 58 copper, etc.) can also use the water meter housing structure of the present invention, and the two housing pieces are firmly welded together by the best method of furnace welding; on the other hand, it can also be applied to stainless steel, copper and other materials The water meter casing is welded with two casing pieces by furnace welding, so that the welding between the two casing pieces can be made stronger to improve the structural strength and weld tightness of the water meter.

In addition, although the structural description of the overlapping edge 13 described above is mainly for horizontal water meters, it is also obviously applicable to vertical water meters. Figures 34a-34c show the schematic diagram of the vertical water meter case that is tangential and flat. Among them, a step + clamping portion is used as the inner ring positioning mechanism, but it is obvious that only the latching portion shown in FIGS. 29 and 30 can be applied as the inner ring positioning mechanism.

As shown in FIGS. 35-38, in some preferred embodiments of the second and third types of inner ring positioning mechanisms of the present invention, the inner ring 2 further includes a fold 215, which is along the outer edge of the inner ring 2 or It is set downward, so that when the inner ring 2 is fitted to the inner wall of the housing body, the folded edge 215 is also fitted to the inner wall of the housing body, so that the inner ring 2 and the inner wall have a larger contact height. The furnace welding fixing of 2 is very effective. It can significantly increase the contact height between the inner ring 2 and the shell body, which significantly improves the furnace welding effect, and makes the welding effect of the inner ring 2 through furnace welding better. The tightness of the inner ring 2 after welding and the structural strength when the movement is installed are enhanced. The hem 215 may be a whole along the 2 perimeter edge of the inner ring, or it may be divided into several independent areas, that is, there are several hem 215, and the orientation of each hem 215 is not necessarily at this time. the same.

In addition, although it is also feasible that the latching portion 222 is fitted to the top of the folded edge 215, this will affect its positioning and fixing effect on the inner ring 2. In order to ensure that the matching effect of the latching portion 222 and the inner ring is not affected, the inner ring 2 further includes a bayonet 216 (as shown in FIGS. 37 and 38) for the latching portion 222, and the position of the bayonet 216 and the latching portion 222. Corresponds and extends to the main body of the inner ring 2 so that the latching portion 222 directly fits with the main body at the bottom of the inner ring 2 (that is, the latching portion 222 does not conflict with the folding edge 215). The height H of the folded edge 215 is the contact height of the inner ring 2 and the fireplace in the casing during welding. At the same time, for the convenience of display, only the structure of the hem 215 on the side matching the shell sheet is shown in Figs. 37 and 38, and other parts may be provided with a hem 215 accordingly.

When in use, first make corresponding parts according to the corresponding structure of each part described above, then place the inner ring in the first and second case pieces and position them with the inner ring positioning mechanism, and then place the first case piece and the The second shell pieces are pieced together to form the shell body; then the joints between the two shell pieces and the joints between the inner ring and the inner wall of the two shell pieces are welded by spot welding, ring welding, furnace welding, etc .; finally The braces are welded to the water inlet, outlet, and meter mouth. The welding method can be general argon arc welding or the aforementioned furnace welding; in this way, a water meter housing can be obtained. Of course, on this basis, it is also possible to perform precise CNC cutting on the parts such as the meter mouth and inner ring, so that the parameters of the finished water meter housing can be made more accurate on the one hand, and the process in the early processing can be reduced. Requirements to reduce manufacturing costs.

A method for processing a water meter case includes the following steps:

Steps for disassembling parts: According to any of the above embodiments, disassemble the water meter case into parts including the first case piece 11, the second case piece 12, the inner ring 2 and the dental mouthpiece 3, and determine the specific Structure; the dental mouthpiece 3 further includes an inlet dental mouthpiece 31, an outlet dental mouthpiece 32, and a housing mouth dental mouthpiece 33.

Steps of stamping and forming: take the stainless steel plate of the shell, place it on the mold, and use one-time or divided hydraulic cold punching or stretching to make the forming structure of the first shell sheet 11 and the second shell sheet 12 conform to the design Defining structural requirements.

Parts processing steps: Take the inner ring 2 stainless steel plate and place it on the inner ring mold, and use one-time or one-step hydraulic cold forming, or use CNC cutting to process, so that the formed structure of the inner ring meets the design requirements . Of course, the inner ring 2 can also be processed by CNC cutting. More preferably, the thickness of the plate of the inner ring 2 is configured to be greater than a set thickness thereof (that is, the thickness of the inner ring in the final finished product of the water meter case), so that the finally obtained shell has a certain thickness margin, so that the During the subsequent NC cutting process, a slight deviation of the fixed position of the inner ring is corrected.

Preferably, it may further include the step of cutting: placing the stamped and formed first and second shell pieces on a cutting machine, and cutting along the direction of the symmetry plane, so as to cut off the excess scrap generated during the forming, and make The cut section is flat so that the male and female pieces have a larger contact area to facilitate subsequent welding processing.

Assembly steps: fit the inner ring 2 into the inner ring positioning mechanism in the casing body, and weld the first casing piece 11 and the second casing piece 12 and the inner ring 2 to the inner wall of the casing body, respectively. Therefore, the water meter casing (also known as the shell embryo part) was finally formed. In the previous Chinese invention patent application, the embryo part was defined as the crude product obtained initially, and the shell was obtained by further microprocessing based on it. The actual shell used; in fact the two are basically equivalent).

More preferably, after the joint of the first shell sheet 11 and the second shell sheet 12 is spot-welded and fixed, the assembled whole workpiece is placed in the girth welding machine to girth-fix the joint; The joint of the workpiece fixed by girth welding is coated with stainless steel metal glue, and then the inner ring 2 and the inner wall of the casing body are furnace-welded.

Preferably, the method further includes a step of cutting, which is located before the step of processing the part; the step of cutting includes: placing the first and

second shell pieces

11 and 12 formed by stamping on a cutting machine to place Excessive scrap from the molding is removed.

In the above-mentioned processing method, the first housing sheet 11, the second housing sheet 12, the inner ring 2 and the braces can be made of stainless steel, copper (including copper, brass, etc., where brass is different depending on its specifications. Proportion of impurity elements, such as tin), other metals / alloys or polymer materials such as plastic. That is to say, the present invention is mainly directed to the structure of the water meter case, and there is no special limitation on the material. The existing materials can meet the requirements of the present invention. At the same time, the above welding is not limited to the traditional metal Welding also includes hot-melt connections between polymer materials such as plastic.

More preferably, the thickness of the dental mouthpiece is configured to be greater than a set thickness thereof (that is, a corresponding thickness requirement in the final finished product of the water meter case), so that the tooth mouth of the finally obtained case has a certain thickness margin, so that the During the subsequent CNC cutting process, some deviations in the machining and assembly of the shell were corrected. The inner ring 2 may be provided in the same manner.

In some preferred embodiments, the step of disassembling the component further includes a step of disassembling the water meter housing into a connecting rod valve bracket and a plastic support, and the connecting rod valve bracket is configured to be disposed in the water outlet channel. At the same time, at the corresponding positions on the first casing sheet and the second casing sheet, a valve hole for the connecting rod valve bracket is reserved during punching and forming for the connecting rod valve bracket to pass through the outlet channel; At the corresponding position on the inner wall of the water outlet channel, a valve slot is also provided, so that the connecting rod valve can be well fixed in the water outlet channel. At the corresponding positions on the first housing sheet and the second housing sheet, a tooth opening for the plastic part bracket is provided during press forming, so that the plastic part bracket can be firmly fixed to the housing body; the plastic part bracket also uses It is made of metal (preferably made of stainless steel), and the plastic support is also welded with the main body of the shell during assembly and welding (respectively after spot welding, and finally furnace welding). More preferably, the latching groove for the valve is also formed by protruding outwards during stamping. In this way, the processed housing can be provided with components such as connecting rod valves and IC housings, thereby forming a smart IC card-type water meter.

Compared with the most traditional casting method, the shell finished product manufactured according to the above-mentioned processing technology and product structure is more environmentally friendly and the wall thickness is thinner, but the main performance parameters can meet the regulations and use requirements; On the one hand, the processing method of the present invention does not have high energy consumption and high pollution during casting and smelting, so the cost is lower and the environment is more friendly. Compared with the laser welding method, the shell structure of the present invention is more reasonable in structure decomposition, and the cost of the equipment used is lower, which is more conducive to popularization. The joints of the parts of the shell of the present invention are sequentially spot welded, ring Welding and furnace welding, the joint is stronger and stress-free.

Claims

A water meter case includes a first case piece (11), a second case piece (12), and an inner ring (2), the first case piece (11) and the second case piece (12) After mating, it is formed into a housing body. A cavity is formed in the housing body for accommodating a measuring movement. The housing body also includes a meter port for the fixed installation of the movement, and a water inlet and a water outlet for water inlet and outlet. ; Characterized by,

An inner ring positioning mechanism for positioning the inner ring (2) in the cavity is provided on at least one of the first shell piece (11) and the second shell piece (12). At least a part of the inner ring (2) is positioned in the cavity; the first shell piece (11) and the second shell piece (12) are welded and fixed, and the inner ring (2) and the inner ring positioning mechanism are welded and fixed.
The water meter case according to claim 1, wherein the inner ring positioning mechanism is an inner ring retaining groove (21).
The water meter case according to claim 1, wherein the inner ring positioning mechanism comprises a step (221) and a latching portion (222) that cooperates therewith; the latching portion (222) is disposed on the first The shell piece (11) or the second shell piece (12) is formed on the inner wall and protrudes toward the cavity.
The water meter case according to claim 3, wherein the inner ring positioning mechanism is replaced with only a locking portion (222), and the inner ring positioning mechanism includes two sets of upper and lower locking portions.
The water meter case according to claim 1, wherein the first case piece (11) and the second case piece (12) are formed by cutting the case body through a cut, a flat cut, or a longitudinal cut. of.
The water meter case according to claim 1, wherein the inner ring (2) is provided with an upper extension (23) and a lower extension (24), and an upper extension (23) and a lower extension, respectively, at both ends. The parts (24) are respectively fitted in the water inlet channel and the water outlet channel.
The water meter case according to claim 1, wherein the inner ring (2) has a flat sheet shape as a whole, and a straight end is provided at one end thereof.
The water meter case according to claim 6 or 7, wherein the inner ring (2) is further provided with a fixing hole (22) provided by the water meter movement, and the fixing hole (22) is provided on the inner ring (2). The other end between the extension (23) and the lower extension (24) or opposite to the end.
The water meter housing according to claim 3 or 4, characterized in that the two ends of the inner ring (2) are respectively provided with an upper extension (23) and a lower extension (24), and the upper extension (23) and The lower extension portion (24) is fitted into the water inlet channel and the water outlet channel, respectively; at least one of the upper extension portion (23) and the lower extension portion (24) is further provided with a branch matching the inner wall of the water inlet channel or the water outlet channel. Ear (214), the inner ring positioning mechanism only positions the middle of the inner ring (2).
The water meter case according to claim 3 or 4, wherein the inner ring retaining groove (21) is formed by stamping and forming a first case piece (11) or a second case piece (12). of.
The water meter case according to claim 3 or 4, characterized in that the locking portion (222) is formed by the first case piece (11) or the second case piece (12) being press-molded inward. of.
The water meter case according to claim 3, characterized in that the step (221) is formed by press-molding the first case piece (11) or the second case piece (12).
The water meter case according to claim 1, characterized in that at least one of the first case piece (11) and the second case piece (12) further comprises an overlapping edge (13), and the first case The body piece (11) and the second shell piece (12) are formed as a shell body through the overlapping edge (13); the overlapping edge (13) includes a bent portion (131) and an extended portion (132). ).
The water meter case according to claim 13, wherein the first case piece (11) and the second case piece (12) are furnace-welded to form a case body.
The water meter case according to claim 3 or 4, characterized in that the inner ring (2) further comprises a folded edge (215) and a bayonet (216) for the fitting of the locking portion (222). 215) It is formed by bending the outer edge of the inner ring (2), and is arranged upward or downward along the outer edge of the inner ring (2); the position of the bayonet (216) corresponds to the position of the latching portion (222).
The water meter case according to claim 1, further comprising a dental mouthpiece, the dental mouthpiece comprising at least one of an inlet dental mouthpiece (31), an outlet dental mouthpiece (32) and a surface mouth dental mouthpiece (33), an inlet dental mouthpiece (31), The outlet dental mouthpiece (32) and the surface mouth dental mouthpiece (33) are used to fit into the water inlet, the water outlet and the surface mouth, respectively.
The method for processing a water meter case according to any one of claims 1 to 16, comprising the following steps:

Steps for disassembling parts: according to any one of claims 1 to 16, disassembling a water meter case to include a first case piece (11), a second case piece (12), and an inner ring (2);

Steps of stamping and forming: take the stainless steel plate of the shell, put it on the mold, and use one-time or divided hydraulic cold punching or stretching to make the first shell piece (11) and the second shell piece (12) The molding structure meets the requirements of the set structure;

Steps for component processing: take the inner ring (2) stainless steel plate and place it on the inner ring mold, and use one-time or one-step hydraulic cold forming, or use CNC cutting to process, so that the forming structure of the inner ring conforms to Design requirements;

Assembly steps: fit the inner ring (2) to the inner ring positioning mechanism in the housing body, and separate the first housing piece (11), the second housing piece (12), and the inner ring (2) with The inner wall of the casing body is welded to form a water meter casing.
The method according to claim 17, characterized in that after the joint of the first shell piece (11) and the second shell piece (12) is spot-welded and fixed, the assembled whole workpiece is placed on In the girth welding machine, the joint is fixed by girth welding; the joint of the workpiece fixed by girth welding is coated with stainless steel metal glue, and then the inner ring (2) and the inner wall of the shell body are furnace-welded.
The method according to claim 17, further comprising the step of cutting, which is located before the step of processing the parts; the step of cutting includes: stamping the first shell piece (11) and the second The shell piece (12) is placed on a cutting machine to cut off the excess material generated during molding.
The method according to claim 17, characterized in that in the step of disassembling the component, further comprising the step of disassembling the water meter housing into a dental mouthpiece (3), the dental mouthpiece (3) is configured to include an inlet The braces (31), the outlet braces (32), and the housing mouth braces (33).