JP4287934B2 - Lost wax well lid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lost wax well lid used for precision casting of a well lid by the lost wax method.
[0002]
[Prior art]
The installation of the deep well submersible pump is performed using a well lid that closes the ground opening of the well casing.
[0003]
The well lid has a structure in which a joint pipe extending in an elbow shape is drawn in a circular arc shape (90 °) from the upper surface (side surface facing the ground) of the disk-shaped closed portion that closes the ground opening of the well casing. Used. And, to the inlet of the joint pipe that opens to the lower surface of the closed part, through the pumping pipe, connect the discharge part of the submersible pump for deep wells, suspend the entire pump, to the outlet that opens at the tip of the joint pipe, Water supply piping such as water supply piping and pressure tanks are connected.
[0004]
A well lid having such a joint pipe is required to have high dimensional accuracy in order to be connected to the pipe.
[0005]
Therefore, recently, it has been considered to form a well lid as a product by precision casting using the lost wax method which is excellent in both productivity and dimensional accuracy.
[0006]
The lost wax method is a casting method in which a model having the same shape as that of an actual product made of wax (wax) is used, a mold material is filled around the wax model, and the wax is poured out to form the wax.
[0007]
The wax model of the well lid used in this casting method, i.e., the lost wax well lid, has the outer shape of the well lid, i.e., the overall shape of the lid having a closed portion and a joint pipe extending in an elbow shape from one side of the closed portion. A corner mold corresponding to the flow channel inside the joint pipe is arranged in the mold space to be followed, and the mold space is filled with wax. As a result, a wax well lid model having a seat portion corresponding to the closed portion and an elbow-shaped bent tube portion corresponding to the joint pipe is formed.
[0008]
By the way, in order to efficiently mold the well lid model, it depends on how easily the elbow-shaped bent pipe portion can be molded.
[0009]
[Problems to be solved by the invention]
Therefore, as shown in FIG. 7, when forming the flow channel c of the curved pipe portion b of the wax well lid a (portion corresponding to the elbow-shaped joint tube of the well lid), the shape of the flow channel c is L-shaped. It is conceivable to adopt a central division type that can be inserted / removed by linear movement from each two directions of 90 ° so that the corner mold e forming the same flow channel c can be inserted / removed from the inside / outside of the mold space of the whole well lid. It is done. In addition, f and g show the division | segmentation part of the corner type | mold e each divided | segmented into the linear part.
[0010]
In the case of the L-shaped flow channel c for inserting / removing the corner type e from these two directions, the corner portion forming the inside of the flow channel c is 90 °, that is, the flow channel c for the convenience of securing the insertion / removal performance of the corner type e. The lost-wax well lid “a” is inevitably formed at the corners where the directions of the inlet and the outlet intersect at right angles.
[0011]
For this reason, a well lid formed by the lost wax method tends to be a product that imposes a large flow path loss.
[0012]
Therefore, as shown in FIG. 8, it is conceivable that the wax molds h and i divided into each part (divided into two in the radial direction) are bonded together to form the entire lost wax well lid a.
[0013]
In this case, the flow path c can be made into a smooth circular arc shape to reduce the flow path loss. However, since the wax molds h and i are bonded together, the mating portion tends to affect the product. More specifically, a loss of flow path loss occurs at the joint part of the wax molds h and i forming the flow channel, or the joint part becomes defective due to variations in thickness, and water in the flow channel leaks to the outside. There is a fear. Moreover, since the molds for forming the wax molds h and i are necessary, the cost is high, and the lost wax well lid a cannot be easily formed.
[0014]
For this reason, a lost wax well lid suitable for forming a well lid in consideration of flow resistance, quality and cost is desired.
[0015]
The present invention has been made paying attention to the above circumstances, and an object of the present invention is to provide a lost wax well lid that has a simple and inexpensive structure and suppresses the flow path loss of the water channel.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, a lost wax well lid according to claim 1 has a closed portion that closes the ground opening of the well casing, and a joint pipe that extends in an elbow shape while drawing an arc shape from one side of the closed portion. In the mold space following the outer shape of the well lid, a corner mold corresponding to the flow channel in the joint pipe is arranged, and using wax, a seat part corresponding to the closed part and an elbow-shaped part corresponding to the joint pipe A lost-wax well lid formed by forming a wax well lid model having a curved pipe portion, wherein the bend of the flow channel is formed only by an arc having a constant radius from one end to the other end of the flow channel. In addition, the wall portion of the flow channel has a bowl shape having an outer diameter smaller than the flow channel diameter, which is removably assembled with the corner type forming the flow channel so as to penetrate the arc portion from the end surface of the corner type. By sub-type, mouth Characterized in that but is formed.
[0017]
Thereby, the flowing water channel of the lost wax well lid has an arc shape smoothly continuing from one end to the other end, and a smooth flowing water channel with less channel loss is obtained. Moreover, since the corner mold for forming the flow channel can be inserted / removed only by moving along the arc direction of the flow channel to be formed, the corner mold has no mating part, one set (one) As a result, a simple and inexpensive structure and a high-quality lost-wax well lid that does not have to worry about the occurrence of burrs or leakage in the product can be realized.
[0018]
In addition to the above-mentioned purpose, the lost wax well lid according to claim 2 is formed so that the flowing water channel is gradually moved toward the other end with respect to the channel diameter at one end so that the lost wax well lid is more easily formed. By forming it so as to be smaller, a draft is given to the corner mold to facilitate the formation of the flow channel using the corner mold.
[0019]
In addition to the above-mentioned purpose, the lost wax well lid according to claim 3 has a seat portion at the center of the arc of the water flow channel in order to make it easier to mold while minimizing the flow path loss of the water flow channel. This is to make the arc of the flowing water channel as large as possible by setting it outside the intersection where the extension line from the end face of the tube and the extension line from the end face of the curved pipe portion intersect.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on the first embodiment shown in FIGS.
[0022]
FIG. 3 shows an entire lost wax well lid 1 (well lid wax model) used in precision casting of the lost wax method, and FIGS. 1 and 2 show how the lost wax well lid 1 is formed. .
[0023]
A lost-wax well lid 1 shown in FIG. 3 includes a flange-shaped seat 2 corresponding to a closed portion (both not shown) that closes the ground opening of the well casing from wax (wax), and 90 from one side of the closed portion. A curved pipe portion 3 corresponding to a joint pipe (not shown) extending in an elbow shape while drawing an arc shape is formed. In addition, it has the flange part 4 which forms the flange for joining in the front-end | tip of the curved pipe part 3. As shown in FIG.
[0024]
For example, as shown in FIG. 1, the lost wax well lid 1 has a corner die 10 corresponding to the flow channel 7 inside the joint pipe disposed in a die space 6 that follows the overall outer shape of the well lid. The mold space 6 is filled with a brazing material.
[0025]
The flowing water channel 7 of the lost wax well lid 1 at this time has a shape in which the channel loss is small, the molding is easy, and the corner mold 10 is easy to handle.
[0026]
That is, the shape of the flow channel 7 is from the two-dot chain line in FIG. 1 and the flange surface of the seat portion 2 that is one end of the flow channel 7 to the flange surface of the bent tube portion that is the other end as shown in FIG. , Only an arc drawn with a constant radius R is formed. In addition, the continuous constant arc that forms this flow channel 7 extends from the intersection point where the extension line X extending from the flange surface of the seat portion 2 and the extension line Y extending from the flange surface at the distal end of the curved pipe portion intersects. The center point O is defined as an arc having a radius R, and the device for bending the flowing water channel 7 with as large an arc as possible is provided.
[0027]
The corner mold 10 for forming the flowing water channel 7 is formed from a solid type that has a shape that follows the shape of the flowing water channel 7, that is, an arc shape drawn with a constant radius R. The corner mold 10 is inserted into the cavity that forms the flow channel 7 of the mold space 6 only by the circumferential movement along the circular arc direction of the flow channel 7 with the center point O of the mold 10 as a fulcrum, and the corner from the molded wax model The mold 10 can be pulled out.
[0028]
Further, as shown in FIG. 2, the flow path diameter of the flow path 7 is changed from one end of the flow path 7, that is, the flow path diameter φD ₁ at the end of the seat portion 2 on the reference surface side of the corner mold 10 to the flow path diameter φD ₂ at the tip of the mold. It is formed so as to gradually become smaller as it goes (for example, a gradient of about 1 ° to 3 °), and a draft is given to the corner mold 10 (φD ₁ > φD ₂ ).
[0029]
By adopting such a flow channel 7, when forming a lost wax well lid, the corner mold 10 is moved in the circumferential direction as shown by an arrow with the center point O as a fulcrum as shown in FIG. If 10 is placed in the cavity that forms the flow channel 7 of the mold space 6 and then the brazing material is filled in the mold space 6, a curve formed by the seat 2 and an arc having a constant radius as shown in FIG. A wax model having the same shape as the actual one having the pipe portion 3 is formed.
[0030]
Thereafter, as shown by the arrow in FIG. 2, the corner mold 10 is moved in the circumferential direction with the center point O as a fulcrum, the corner mold 10 is pulled out from the mold space 6, and a wax model molded from the mold space 6 is obtained. If taken out, the lost wax well lid 1 used in precision casting by the lost wax method as shown in FIG. 3 is formed.
[0031]
Such a lost wax well lid 1 has a circular arc shape in which the water flow path 7 smoothly continues from one end to the other end, so that a smooth water flow path 7 with less flow path loss can be formed.
[0032]
Moreover, by forming the water flow channel 7 only with a constant circular arc, the corner mold 10 forming the flow water channel 7 is formed with a constant radius that can be inserted into and removed from the mold space 6 only by movement in the circumferential direction. The (one) mold can be used, and the lost wax valve lid 1 can be formed with a simple and inexpensive structure. In addition, since the corner mold 10 is a set of molds, unlike a mold having a mating portion, there is no concern about the occurrence of burrs or leakage in the product.
[0033]
Therefore, a lost wax well lid excellent in quality and cost can be realized.
[0034]
In addition, since the flow channel 7 is formed so that the flow path diameter gradually decreases from one end to the other end, a draft is given to the corner mold 10, and the corner mold 10 can be easily pulled out. Become.
[0035]
This makes it easier to form the water flow channel 7, and the lost wax well lid 1 can be more easily formed.
[0036]
In addition, since the circular arc of the flowing water channel 7 is formed as a constant circular arc with the center point O defined outside the flange surfaces of the seat portion 2 and the flange portion 4 as the radius R, the flowing water channel 7 is as large as possible. The flow path loss of the flowing water channel 7 can be minimized. Moreover, the corner mold 10 can be easily produced.
[0037]
5 and 6 show a second embodiment of the present invention.
[0038]
In the present embodiment, the present invention has a complicated shape having a small diameter φD ₃ mouth portion 20 (φD ₁ , φD ₂ > φD ₃ ) in the wall portion of the water flow channel 7 facing the tangential direction as shown in FIG. This is applied to the lost wax well lid 1.
[0039]
At this time, a straight through hole 21 extending from the end face of the corner mold 10 toward the mouth 20 is formed in the constant arc corner mold 10 forming the flow channel 7, and the inside of the mouth 20 is formed in the through hole 21. A set of corner molds 24 in which a bowl-shaped sub mold 23 that forms a cavity is removably inserted and combined is adopted.
[0040]
As a result, when forming the lost wax well lid 1 with the mouth portion 20 attached to the middle of the bent tube portion 3, the corner type is first formed with the center point O as a fulcrum as shown by the arrow A in FIG. 10 is moved in the circumferential direction, and the corner mold 10 is disposed in a cavity forming the flow channel 7 of the mold space 6, and then, as indicated by an arrow B in FIG. When the sub-mold 23 is inserted into 21 and the tip portion is inserted to a predetermined position of the cavity of the mouth portion 20 and then the brazing material is filled in the mold space 6, the seat portion 2 and the seat portion 2 are fixed as shown in FIG. A curved pipe portion 3 with a mouth portion 20 formed by a circular arc having a radius is formed.
[0041]
Thereafter, as shown by an arrow C in FIG. 5, the sub mold 23 is first pulled out from the corner mold 10, and then, with the center point O as a fulcrum as shown by the arrow D in FIG. If the corner mold 10 is moved in the direction and the corner mold 10 is pulled out from the mold space 6 and the wax model formed from the mold space 6 is taken out, the complex used in precision casting by the lost wax method as shown in FIG. A well-shaped well 1 made of lost wax is formed.
[0042]
As a result, even in the complicated flow channel 7 in which the mouth portion 20 is formed in the wall portion of the flow channel 7, the molding can be easily performed by the set of corner molds 24 in which the corner mold 10 and the sub mold 23 are combined. Become. Moreover, since a set of corner molds 24 is required, a product that is inexpensive in terms of cost and has little variation in dimensional accuracy can be obtained.
[0043]
However, in the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0044]
【The invention's effect】
As described above, water flow path b strike wax made well lid, since the arc shape all smoothly continuous from one end to the other, it is possible to passage loss is obtained a less smooth flowing water channel. In addition, the corner type that forms the flow channel by forming the flow channel with only a constant circular arc is one type that is formed with a constant radius that can be inserted into and removed from the mold space only by moving in the circumferential direction. Mu In addition, since only one mold is required, there is no concern about the occurrence of burrs or leaks in the product, unlike molds with mating parts .
Therefore, simple and inexpensive construction, can provide reduced muted lost wax manufactured by well cover the flow passage loss of spillway.
[0045]
Et al in addition to the above effects of, giving draft angle corner type, since facilitate the shaping of the spillway by the corner-type, can be more easily molded lost wax manufactured well cover.
[0046]
Et al in addition to the above effects of, as much as possible can be increased arc flowing water channel can be a flowing water channel with minimal flow path loss. In addition, since the arc becomes larger, the flow channel can be more easily formed and the mold can be easily produced.
[0047]
Et al in addition to the above effects of, in flowing water channel complex spillway mouth portion is formed in the wall of the, by the type of set of combined subtype of rod-shaped in an arc-shaped corner-type, can be easily molded. Moreover, since it is a set of molds, it is possible to produce a product with low cost, good dimensional accuracy, and little variation.
[Brief description of the drawings]
FIG. 1 is a sectional view for explaining a mold structure for forming a lost wax well lid according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating a process until a lost wax well lid is formed with the same structure.
FIG. 3 is a sectional view showing the whole of a lost wax well lid formed with the same type structure.
FIG. 4 is a cross-sectional view for explaining a mold structure for molding a lost wax well lid according to a second embodiment of the present invention.
FIG. 5 is a cross-sectional view for explaining a process until a lost wax well lid is formed with the same structure.
FIG. 6 is a cross-sectional view showing the whole of a lost wax well lid formed with the same structure.
FIG. 7 is a cross-sectional view for explaining a lost wax well lid formed using a two-part corner mold.
FIG. 8 is a view for explaining the structure of a bonded-type lost wax well lid;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Ross wax well lid 2 ... Seat part 3 ... Curved pipe part 6 ... Mold space 7 ... Flow channel 10 ... Corner type | mold 20 ... Mouth part 21 ... Through-hole 22 ... Sub-type R ... Radius O ... Center point.

Claims (3)

Corresponding to the flow channel in the joint pipe in the mold space following the outer shape of the well lid having a closed part that closes the ground opening of the well casing and a joint pipe that extends in an elbow shape from one side of the closed part Made of a lost wax, in which a corner mold is arranged and a wax well lid model having a seat portion corresponding to the closed portion and an elbow-shaped bent tube portion corresponding to the joint pipe is formed using wax. A well lid ,
The bend of the flow channel is formed only by an arc having a constant radius from one end to the other end of the flow channel ,
The wall portion of the water flow channel has a bowl-shaped sub-diameter having an outer diameter smaller than the flow channel diameter, which is removably combined with the corner type forming the flow channel so as to penetrate the arc portion from the end surface of the corner type. A lost-wax well lid characterized in that a mouth is formed by a mold .   2. The lost wax well lid according to claim 1, wherein the flowing water channel is formed so as to gradually become smaller toward the other end with respect to the flow channel diameter at one end.   The center of the circular arc of the flowing water channel is defined outside an intersection point where an extension line from the end surface of the seat portion and an extension line from the end surface of the bent tube portion tip end are intersected. The lost-wax well lid according to 2.

Images