Sand core structure for preventing cracking of casting shrinkage cavity of stainless steel water meter shell

Abstract

The utility model relates to the technical field of water meter shell pouring shrinkage cavity cracking prevention, and discloses a stainless steel water meter shell pouring shrinkage cavity cracking prevention sand core structure which comprises a shell, an annular mold is fixedly connected to the top of the shell, a water inlet pipeline is fixedly connected to the left side of the shell, and a valve control water outlet pipe is fixedly connected to the right side of the shell. A valve seat left upper rib is arranged at the upper end of the left side of the shell, a valve seat right lower rib is arranged at the lower end of the right side of the shell, the left side of the valve seat left upper rib protrudes to be of a plane structure, the right side of the valve seat right lower rib protrudes to be of a plane structure, and outer body ring grooves are formed in the front side and the rear side of the outer wall of the shell. According to the water meter shell, the valve seat lower right rib and the valve seat upper left rib are matched to be formed in the outer body annular grooves in the front and the back of the shell, the thickness of the outer wall of the water meter shell can be balanced, and therefore the effect that shrinkage cavity cracking at the connecting positions of the shell, the valve seat lower right rib and the valve seat upper left rib during cooling after pouring is avoided is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of preventing water meter shells from being cracked due to shrinkage cavities caused by casting, in particular to a sand core structure for preventing stainless steel water meter shells from being cracked due to shrinkage cavities caused by casting. Background Art

[0002] A stainless steel water meter is a measuring instrument used to measure water flow. Its outer shell is made of stainless steel. This type of water meter uses the power generated when water flows through the water meter to drive the impeller or other metering elements inside the water meter to rotate, and records the water flow through certain transmission and counting devices. In the production process of stainless steel water meters, sand cores are one of the essential core components.

[0003] The sand core of the stainless steel water meter case is the core material used to manufacture the internal shape of the water meter case in casting production. It is made of casting sand, sand binder and auxiliary materials mixed in a certain proportion. Its main function is to form the complex structure of cavities and channels inside the water meter case during the casting process of the stainless steel water meter case.

[0004] The existing sand core structure of the stainless steel water meter case is cast by pouring, but when it cools down, it will cause shrinkage and cracking during crystallization, which requires post-processing, affecting not only product quality but also work progress. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a sand core structure for preventing shrinkage cracking of stainless steel water meter casing during casting, aiming to improve the problem in the prior art that shrinkage cracking will occur during crystallization during cooling, resulting in the need for post-processing.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a sand core structure for preventing shrinkage holes and cracking in a stainless steel water meter case during casting, comprising a shell, the top of the shell is fixedly connected to an annular mold, the left side of the shell is fixedly connected to a water inlet pipe, the right side of the shell is fixedly connected to a valve-controlled water outlet pipe, the left upper end of the shell is provided with a left upper rib of a valve seat, the right lower end of the shell is provided with a right lower rib of a valve seat, the left side of the upper left rib of the valve seat protrudes into a planar structure, the right side of the lower right rib of the valve seat protrudes into a planar structure, the front and rear sides of the outer wall of the shell are provided with outer body annular grooves, the outside of the valve-controlled water outlet pipe is fixedly connected to a valve casting mechanism, and the valve casting mechanism is used to cast a control valve mold.

[0007] As a further description of the above technical solution:

[0008] The valve casting mechanism includes a valve connecting pipe mold, the inner wall of the valve connecting pipe mold is fixedly connected to the outer wall of the valve-controlled water outlet pipe, the outer wall of the valve connecting pipe mold is fixedly connected to the valve body mold, the top left side of the valve body mold is fixedly connected to a fixing ring, the middle part of the fixing ring is fixedly connected to the valve stem mold, and the middle part of the valve stem mold is fixedly connected to the valve cap mold.

[0009] As a further description of the above technical solution:

[0010] The inner sides of the shell and the annular mold are both provided with water meter grooves.

[0011] As a further description of the above technical solution:

[0012] The bottom of the water meter tank is provided with an arc-shaped wall.

[0013] The utility model has the following beneficial effects:

[0014] 1. In the present invention, after continuous improvement of the design of the arc thickness and shape, it is found that a more protruding arc and a slightly wider and thicker cross-section can make the cooling speed faster and improve the uniformity of cooling and shrinkage compensation, thereby avoiding shrinkage holes and cracking. Therefore, the outer ring grooves opened in front and behind the shell by the cooperation of the lower right rib of the valve seat and the upper left rib of the valve seat can balance the thickness of the outer wall of the water meter shell, thereby achieving the effect of avoiding shrinkage holes and cracking at the connection between the shell and the lower right rib of the valve seat and the upper left rib of the valve seat during cooling after casting, while omitting the process of later processing and repairing, and also improving the production quality and work efficiency of the product.

[0015] 2. In the present invention, space is reserved for the subsequent installation of the valve by fixing the valve connecting pipe mold, valve body mold, valve-controlled water outlet pipe, valve body mold, fixing ring, valve stem mold, and valve cap mold outside the valve-controlled water outlet pipe, thereby achieving the effect of early deployment of the subsequent water meter valve installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional diagram of the sand core structure for preventing shrinkage and cracking of a stainless steel water meter case proposed in the present invention;

[0017] Figure 2 This is a front view of the sand core structure for preventing shrinkage and cracking of a stainless steel water meter case proposed by the present invention;

[0018] Figure 3 This is a top view of the sand core structure for preventing shrinkage and cracking of a stainless steel water meter case proposed in the present invention;

[0019] Figure 4 This is a partial structural cross-sectional view of the sand core structure for preventing shrinkage and cracking of a stainless steel water meter case proposed in the present invention;

[0020] Figure 5 This is a disassembled diagram of the valve casting mechanism of the sand core structure for preventing shrinkage and cracking in the stainless steel water meter case proposed by the present invention.

[0021] Legend:

[0022] 1. Shell; 2. Valve casting mechanism; 201. Valve connecting pipe casting mold; 202. Valve body casting mold; 203. Retaining ring; 204. Valve stem casting mold; 205. Valve bonnet casting mold; 3. Ring mold; 4. Water inlet pipe; 5. Valve-controlled water outlet pipe; 6. Lower right rib of valve seat; 7. Upper left rib of valve seat; 8. Water meter groove; 9. Outer body ring groove; 10. Curved wall. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Reference Figure 1 and Figure 4 The utility model provides an embodiment: a sand core structure for preventing shrinkage and cracking of a stainless steel water meter case during casting, comprising a shell 1, a ring mold 3 fixedly connected to the top of the shell 1, the ring mold 3 is used to install the water meter, the left side of the shell 1 is fixedly connected to a water inlet pipe 4, the right side of the shell 1 is fixedly connected to a valve-controlled water outlet pipe 5, water flows in the water meter case through the water inlet pipe 4 and the valve-controlled water outlet pipe 5, the left upper end of the shell 1 is provided with a valve seat left upper rib 7, the right lower end of the shell 1 is provided with a valve seat right lower rib 6, the left side of the valve seat left upper rib 7 protrudes into a plane structure, and the right side of the valve seat right lower rib 6 protrudes into a plane structure, the outer wall of the shell 1 is provided with an outer body annular groove 9 on the front and back sides, the thickness of the shell 1 is balanced by the valve seat left upper rib 7, the valve seat right lower rib 6 and the outer body annular groove 9, the outside of the valve-controlled water outlet pipe 5 is fixedly connected to a valve casting mechanism 2, and the valve casting mechanism 2 is used to cast a control valve mold.

[0025] Reference Figure 2 and Figure 5The valve casting mechanism 2 includes a valve connecting pipe mold 201. The inner wall of the valve connecting pipe mold 201 is fixedly connected to the outer wall of the valve-controlled water outlet pipe 5. The outer wall of the valve connecting pipe mold 201 is fixedly connected to the valve body mold 202. The cooperation between the valve connecting pipe mold 201 and the valve body mold 202 facilitates the later installation of the valve. A fixing ring 203 is fixedly connected to the top left side of the valve body mold 202. The middle part of the fixing ring 203 is fixedly connected to the valve stem mold 204. The fixing ring 203 is used to connect and fix the valve stem mold 204, and the valve stem mold 204 provides protection for the valve control position. The middle part of the valve stem mold 204 is fixedly connected to the valve bonnet mold 205. The valve switch installation position is conveniently opened through the valve bonnet mold 205 on the valve stem mold 204.

[0026] Reference Figure 3 and Figure 4 A water meter groove 8 is provided on the inner side of the shell 1 and the annular mold 3. A water flow velocity measuring structure of a water meter is installed in the water meter groove 8. An arc-shaped wall 10 is provided at the bottom of the water meter groove 8. The arc-shaped wall 10 at the bottom of the water meter groove 8 is convenient for reducing the bonding surface during the later demoulding.

[0027] Working principle: Previously, the design was based on the shape of the water meter. During the many casting experiments, the problem of cracking and shrinkage holes always occurred. Later, it was found that the arc-shaped corners, especially the pipe joints, were relatively thick and the shrinkage feeding space was large. Coupled with the stress of cooling crystallization, shrinkage holes and cracks would be formed. For this reason, after continuous improvement of the arc thickness and shape design, it was found that the arc was more protruding and the cross-section was slightly wider and thicker, which could make the cooling speed faster and the cooling shrinkage feeding uniformity improved, thereby avoiding shrinkage holes and cracking. Therefore, the sand core has a ring mold 3 fixed on the top of the shell 1 for the water meter in the later stage. At the same time, the water inlet pipe 4 is fixed on the left side of the shell 1 for The water pipe is connected to the water flow, and the valve-controlled water outlet pipe 5 is fixed on the right side of the shell 1 to provide a position for the later installation of the valve. The upper left rib 7 of the valve seat is opened below the connection between the shell 1 and the water inlet pipe 4. At the same time, the lower right rib 6 of the valve seat is opened above the connection between the shell 1 and the valve-controlled water outlet pipe 5. The outer body ring groove 9 opened in front and behind the shell 1 through the cooperation of the lower right rib 6 of the valve seat and the upper left rib 7 of the valve seat can balance the thickness of the outer wall of the water meter shell, thereby avoiding the shrinkage cracking at the connection between the shell 1 and the lower right rib 6 and the upper left rib 7 of the valve seat during cooling after casting, thereby omitting the process of later processing and repairing while improving the production quality and work efficiency of the product;

[0028] A valve connecting pipe mold 201 is fixed on the outside of the valve-controlled water outlet pipe 5 to reserve a position for the later installation of the valve, and the valve body mold 202 fixed on the outside of the valve connecting pipe mold 201 reserves enough space for installing the valve in the valve-controlled water outlet pipe 5. Then the fixing ring 203 fixed on the valve body mold 202 plays a fixing role when the valve is installed, and then the fixing ring 203 cooperates with the valve stem mold 204 fixed thereon to provide protection for the valve control position. At the same time, the valve cap mold 205 fixed in the middle of the valve stem mold 204 is convenient for the later installation position of the valve switch, thereby achieving the effect of early deployment of the later water meter valve installation.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sand core structure for preventing shrinkage and cracking of a stainless steel water meter housing, comprising a housing (1), characterized in that: The top of the shell (1) is fixedly connected to a ring mold (3), the left side of the shell (1) is fixedly connected to a water inlet pipe (4), the right side of the shell (1) is fixedly connected to a valve-controlled water outlet pipe (5), the left upper end of the shell (1) is provided with a valve seat left upper rib (7), the right lower end of the shell (1) is provided with a valve seat right lower rib (6), the left side of the valve seat left upper rib (7) protrudes into a plane structure, the right side of the valve seat right lower rib (6) protrudes into a plane structure, the outer wall front and rear sides of the shell (1) are provided with outer body annular grooves (9), the outside of the valve-controlled water outlet pipe (5) is fixedly connected to a valve casting mechanism (2), and the valve casting mechanism (2) is used for casting a control valve mold.

2. The sand core structure for preventing shrinkage and cracking of a stainless steel water meter case according to claim 1, characterized in that: The valve casting mechanism (2) comprises a valve connecting pipe mold (201), the inner wall of the valve connecting pipe mold (201) is fixedly connected to the outer wall of the valve-controlled water outlet pipe (5), the outer wall of the valve connecting pipe mold (201) is fixedly connected to the valve body mold (202), the top left side of the valve body mold (202) is fixedly connected to a fixing ring (203), the middle part of the fixing ring (203) is fixedly connected to a valve stem mold (204), and the middle part of the valve stem mold (204) is fixedly connected to a valve cap mold (205).

3. The sand core structure for preventing shrinkage and cracking of a stainless steel water meter case according to claim 1, characterized in that: Water meter grooves (8) are provided on the inner sides of the shell (1) and the annular mold (3).

4. The sand core structure for preventing shrinkage and cracking of a stainless steel water meter case according to claim 3 is characterized in that: The bottom of the water meter tank (8) is provided with an arc-shaped wall (10).

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