Lost model of valve box

Abstract

To provide an evaporative pattern for a valve box allowed to suitably make a valve box having an accommodation unit allowed to receive a measuring instrument.SOLUTION: An evaporative pattern 1 for a valve box, to be arranged within a mold 4 and replaced with melt to thereby make a valve box 100, comprises: a valve-body forming portion 10 that corresponds to a valve-body unit 110 allowed to receive a valve body 2; a joint-forming portion 20 that corresponds to a joint 120; and an accommodation-unit forming portion 30 that is arranged between the valve-body forming portion 10 and the joint forming portion 20 and corresponds to an accommodation unit 130 allowed to receive a sensor 3.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lost foam mold technology for valve boxes.

Background Art

[0002] Conventionally, as a method for obtaining information in a pipeline (flow path) such as a water pipe, there are a method of permanently obtaining information by installing dedicated equipment such as a water quality monitoring device or a flow meter in the middle of the flow path, and a method of temporarily introducing various sensors into the flow path through existing fire hydrants or the like to obtain information.

[0003] However, in the former method, the installation cost is relatively high, and a dedicated installation space may be required, so it is difficult to obtain information on the pipeline network over a wide range. Also, in the latter method, although it is possible to obtain information for a limited period and location, it is difficult to obtain information on the pipeline network over a wide range and permanently.

[0004] Here, a valve for opening and closing the fluid flow path is appropriately provided in a pipeline such as a water pipe. As a general valve, a valve as described in Patent Document 1 is known. Since a large number of such valves are installed in the pipeline network, if information in the flow path can be obtained using this valve, information on the pipeline network can be obtained over a wide range and permanently. Therefore, a valve capable of accommodating a measuring device for obtaining information in the flow path is desired.

[0005] As a method for manufacturing a valve box constituting such a valve, a casting method using a lost foam mold is generally known. Therefore, a lost foam mold capable of preferably manufacturing a valve box having a housing portion capable of accommodating a measuring device is desired.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

[0007] One aspect of this disclosure has been made in view of the above circumstances, and the problem it seeks to solve is to provide a lost-wax model for a valve body that can suitably manufacture a valve body having a housing section capable of accommodating measuring instruments. [Means for solving the problem]

[0008] The problems that this invention aims to solve are as described above, and the means for solving these problems will now be explained.

[0009] A lost-wax model for a valve body according to one aspect of the present disclosure is a lost-wax model for a valve body that is placed in a mold and replaced with molten metal to manufacture a valve body, comprising: a valve body forming portion corresponding to a valve body portion capable of housing a valve element; a joint forming portion corresponding to a joint; and a portion disposed between the valve body forming portion and the joint forming portion, capable of housing measuring instruments. Forming space Corresponding to the storage area shape It comprises a housing section forming section and, The housing section forming section comprises a flow path section forming section corresponding to a fluid flow path section, a section forming section forming section having a shape corresponding to a section separated from the flow path section and comprising a side wall that partitions the space in which measuring instruments are housed, and a wall forming section forming section having a shape corresponding to a wall that partitions the space in which measuring instruments are housed, and comprising a bottom section that partitions the space in which measuring instruments are housed, wherein the wall forming section comprises a hole that connects the flow path section forming section and the section forming section, and the hole is formed in the center of the wall forming section when viewed in the direction of communication between the flow path section forming section and the section forming section. It is. According to one aspect of this disclosure, a valve body having a housing capable of accommodating measuring instruments can be suitably manufactured. Furthermore, a valve body having a housing capable of accommodating measuring instruments can be suitably manufactured.

[0011] In one aspect of the present disclosure, the valve body forming portion, the joint forming portion, and the housing portion forming portion are joined to each other, and the joint forming portion has a joining surface that can be joined to either the valve body forming portion or the housing portion forming portion. According to one aspect of this disclosure, the versatility of the lost model can be improved. [Effects of the Invention]

[0012] According to one aspect of this disclosure, a valve body having a housing capable of accommodating measuring instruments can be suitably manufactured. [Brief explanation of the drawing]

[0013] [Figure 1] Perspective view of the expendable mold for the valve box according to the first embodiment. [Figure 2] Front view of the expendable mold. [Figure 3] (a) Right side view of the expendable mold. (b) Left side view of the expendable mold. [Figure 4] Top view of the expendable mold. [Figure 5] Bottom view of the expendable mold. [Figure 6] (a) Cross-sectional view taken along line A1-A1 in FIG. 2. (b) Cross-sectional view taken along line B1-B1 in FIG. 2. [Figure 7] Cross-sectional view taken along line C1-C1 in FIG. 4. [Figure 8] Side cross-sectional view of the valve box manufactured using the expendable mold. [Figure 9] Side cross-sectional view schematically showing the state of manufacturing the valve box using the expendable mold. [Figure 10] Front view showing the state where the expendable mold is disassembled. [Figure 11] Perspective view of the expendable mold for the valve box according to the second embodiment. [Figure 12] Front view of the expendable mold. [Figure 13] Right side view of the expendable mold. [Figure 14] Top view of the expendable mold. [Figure 15] Bottom view of the expendable mold. [Figure 16] (a) Cross-sectional view taken along line A2-A2 in FIG. 12. (b) Cross-sectional view taken along line B2-B2 in FIG. 12. [Figure 17] Cross-sectional view taken along line C2-C2 in FIG. 14.

BEST MODE FOR CARRYING OUT THE INVENTION

[0014] Hereinafter, the directions indicated by the arrows U, D, F, and B in the drawings will be defined as the upward, downward, forward, and backward directions, respectively, for the description.

[0015] Hereinafter, the expendable mold 1 for the valve box according to an embodiment of the present invention will be described.

[0016] Lost model 1 is used in the manufacture of valve body 100, which is used to manage water flowing through water pipes. Below, we will first explain valve body 100.

[0017] The valve body 100 shown in Figure 8 constitutes a valve device that controls the flow of water in a water pipe. More specifically, the valve body 100, together with a valve element 2 that partitions the water flow path and a sensor 3 that acquires information from inside the water pipe, constitutes a valve device. The valve body 100 is connected to the water pipe below a valve box (not shown) installed underground. The valve body 100 forms a water flow path that extends in the left-right direction. The valve body 100 is manufactured by casting. A detailed explanation of the manufacturing method of the valve body 100 will be given later.

[0018] The valve body 100 comprises a valve body 110, a joint 120, and a housing 130. For the sake of clarity, in Figure 8, the boundaries of each part of the valve body 100 are shown with dashed lines. As will be described later, the valve body 100 is roughly the same shape as the lost model 1.

[0019] The valve body 110, together with the valve element 2, constitutes the valve of the valve device. As the valve, for example, a gate valve (e.g., a soft-seal gate valve) that closes by partitioning the flow path (flow path section 111, described later) of the valve body 110 can be used. The valve body 110 constitutes the middle part of the valve casing 100 in the left-right direction. The valve body 110 comprises a flow path section 111 and a valve element housing section 112.

[0020] The flow path section 111 is the part of the valve body 110 that forms a flow path through which water flows. The flow path section 111 constitutes the lower part of the valve body 110. The flow path section 111 is formed in a substantially cylindrical shape that demarcates the hollow section (the part that becomes the flow path) that penetrates the valve body 110 from left to right.

[0021] The valve body housing 112 is the portion in which the valve body 2 is housed. The valve body housing 112 constitutes the upper portion of the valve body 110. The valve body housing 112 is formed in a shape capable of housing the valve body 2. The valve body housing 112 communicates with the flow path 111 through an opening 112a formed at its lower end. The opening 112a is formed so that the valve body 2 can be inserted through it.

[0022] The joint 120 is the part that connects to the water pipe. The joint 120 is formed in a substantially cylindrical shape that extends in the left-right direction. The joint 120 constitutes both left and right ends of the valve body 100.

[0023] The housing section 130 is a part capable of housing measuring instruments for measuring the inside of the water pipe. In this embodiment, a sensor 3 capable of acquiring information inside the flow path (flow path section 131, described later) of the valve body 100 is used as the measuring instrument. As the sensor 3, a flow velocity sensor capable of measuring the flow velocity of water flowing in the flow path or a water quality sensor capable of measuring the water quality can be used. However, the sensor 3 is not limited to the example described above, and various sensors capable of acquiring information inside the flow path can be used. Furthermore, the equipment that can be housed in the housing section 130 is not limited to the sensor 3, and various equipment such as a camera capable of photographing the inside of the flow path, communication equipment, and a battery can be used.

[0024] The housing section 130 is located midway along the left-right direction of the valve body 100 and constitutes the portion to the right of the valve body 110 (the portion between the valve body 110 and the joint 120 at the right end). The housing section 130 comprises a flow path section 131 and an equipment housing section 132.

[0025] The flow channel section 131 is the part that forms a flow channel through which water flows in the housing section 130. The flow channel section 131 constitutes the lower part of the housing section 130. The flow channel section 131 is formed in a substantially cylindrical shape that demarcates the hollow section (the part that becomes the flow channel) that penetrates the housing section 130 from left to right.

[0026] The equipment housing section 132 houses the sensor 3 (measuring instrument) and forms a space partitioned from the flow path section 131. The equipment housing section 132 constitutes the upper part of the housing section 130. The equipment housing section 132 is formed in a shape capable of housing the sensor 3. The equipment housing section 132 comprises a partition section 133 and a wall section 134.

[0027] The partitioned section 133 is a part that constitutes a side wall that horizontally partitions the space in which the sensor 3 is housed.

[0028] The wall portion 134 is the bottom portion that partitions the space in which the sensor 3 is housed in the vertical direction. The wall portion 134 also constitutes the upper part of the flow path portion 131. In other words, the wall portion 134 serves as both the bottom of the equipment housing portion 132 and the upper part of the flow path portion 131. The wall portion 134 separates the flow path portion 131 from the partition portion 133 (the interior of the partition portion 133). The wall portion 134 is provided with an insertion hole 134a.

[0029] The through-hole 134a is a hole that penetrates the wall portion 134 in the vertical direction. The through-hole 134a is formed approximately in the center of the wall portion 134 in a plan view. The through-hole 134a connects the flow path portion 131 and the partition portion 133. As shown in Figure 8, the sensor 3 (measuring instrument) is inserted through the through-hole 134a. The inner diameter of the through-hole 134a is formed to be larger than the outer diameter of various measuring instruments, including the sensor 3, so that it can accommodate various measuring instruments. An intermediate part (not shown) is provided between the outer diameter of the sensor 3 and the inner diameter of the through-hole 134a to fill the gap. As the intermediate part, for example, a cylindrical holder for the sensor 3 can be used.

[0030] As shown in Figure 8, the flow path sections 111 and 131 and the left and right joints 120 of the valve body 100 are in communication with each other and form a flow path that extends in the left and right directions. The valve device composed of the valve body 100 can partition the flow path with the valve body 2 of the valve body 110, or acquire information about the water flowing through the flow path using the sensor 3 in the housing 130.

[0031] In this embodiment, the valve body 100 is manufactured by a casting method using a lost-wax model 1 with a shape corresponding to the valve body 100. The casting method using the lost-wax model 1 will be described below with reference to Figure 9.

[0032] First, the lost-wax model 1 is placed in the mold 4 so as to be embedded in sand (foundry sand), and the gaps are filled with foundry sand by applying vibration and depressurization. In the example figure, the foundry sand is shown as filled in. Next, molten metal (not shown) is supplied into the mold 4. As a result, the lost-wax model 1 is replaced by the molten metal, and the valve body 100 is formed. After the valve body 100 is removed from the mold 4, appropriate surface treatment of the casting surface and processing such as drilling are performed. According to the above manufacturing method, a valve body 100 comprising the valve body 110, the joint 120, and the housing 130 can be integrally molded by casting.

[0033] The following describes the problems that can be expected in casting using the lost-wax model described above.

[0034] In general casting methods using lost-wax molds, the lost-wax mold may deform due to the vibration filling of the casting sand into the mold and the resulting sand pressure from reduced pressure. In this embodiment, when manufacturing a valve body 100 having a housing section 130, a portion corresponding to the wall section 134 is formed in the lost-wax mold, which separates the flow path section 131 from the partition section 133. Furthermore, in casting, casting defects such as shrinkage cavities and poor molten metal flow are prone to occur in areas of the casting that are thin or where the runners are discontinuous. Therefore, it is common practice to drill holes after casting to stabilize the casting quality. For this reason, in general casting methods, the through holes 134a in the wall section 134, which is a relatively thin section, are formed by drilling (cutting) or the like after casting. In this case, the portion of the lost-wax mold corresponding to the wall section 134 is formed as a wall without holes.

[0035] When a lost-wax model as described above is embedded in foundry sand, the portion of the lost-wax model corresponding to the wall portion 134 is not filled with foundry sand, and the surrounding area of ​​the lost-wax model becomes discontinuous with foundry sand between the flow channel portion 131 and the partition portion 133. As a result, this portion is prone to deformation and cracking due to vibration filling of the foundry sand and sand pressure due to reduced pressure. The deformation described above can occur in both cases: when the lost-wax model is positioned with its longitudinal direction (flow direction) facing up and down (vertically) (see Figure 9), and when the lost-wax model is positioned with its longitudinal direction facing horizontal (horizontally).

[0036] The lost-wax model 1 according to this embodiment prevents deformation, cracking, etc., as described above, and allows for the suitable manufacture of a valve body 100 having a housing portion 130. The lost-wax model 1 will be described below with reference to Figures 1 to 7 and Figure 10.

[0037] Lost-wax model 1 is a model used to manufacture the valve body 100 by being replaced by molten metal during casting. Lost-wax model 1 is formed to be approximately the same size and shape as the valve body 100. Lost-wax model 1 is formed from, for example, expanded polystyrene. Lost-wax model 1 comprises a valve body forming section 10, a joint forming section 20, and a housing forming section 30.

[0038] As shown in Figure 10, each part of the lost-wax model 1 (valve body forming part 10, joint forming part 20, and housing forming part 30) is formed separately from each other. The lost-wax model 1 is formed by joining these parts together with an adhesive or the like.

[0039] The valve body forming section 10 corresponds to the valve body section 110 of the valve casing 100. In other words, the valve body forming section 10 constitutes the middle section of the lost-wax model 1 in the left-right direction. The valve body forming section 10 comprises a flow path forming section 11, a valve body housing forming section 12, and a joint surface 13.

[0040] The flow path forming portion 11 shown in Figures 6(b) and 7 corresponds to the flow path portion 111 of the valve body portion 110. That is, the flow path forming portion 11 constitutes the lower part of the valve body forming portion 10 and is formed in a substantially cylindrical shape that demarcates the hollow portion (the portion that becomes the flow path) that penetrates the valve body forming portion 10 from left to right.

[0041] The valve body housing portion 12 corresponds to the valve body housing portion 112 of the valve body portion 110. In other words, the valve body housing portion 12 constitutes the upper portion of the valve body housing portion 10. As shown in Figures 1, 6(b), and 7, the valve body housing portion 12 is formed in a substantially box shape that opens upward. Also, as shown in Figures 1 and 4, the valve body housing portion 12 is formed in a substantially rectangular shape in plan view.

[0042] A flange extending horizontally is formed at the upper end of the valve body housing forming section 12. Also, as shown in Figure 7, an opening 12a is formed at the lower end of the valve body housing forming section 12, corresponding to the opening 112a of the valve body housing section 112 and communicating with the flow path forming section 11.

[0043] The joint surface 13 shown in Figure 10 is the surface of the valve body forming part 10 that is joined to the joining target (joint forming part 20 and housing forming part 30). The joint surface 13 constitutes both left and right sides of the valve body forming part 10. The left and right joint surfaces 13 are formed to be the same shape as each other.

[0044] The joint forming portion 20 shown in Figure 1 corresponds to the joint 120 of the valve body 100. That is, the joint forming portion 20 constitutes both left and right ends of the lost-wax model 1. The left and right joint forming portions 20 are formed to be the same shape as each other. The joint forming portion 20 is formed in a substantially cylindrical shape that extends in the left and right directions. The leading end of the joint forming portion 20 in the extension direction is provided with a flange that widens in diameter relative to the other parts. As shown in Figures 7 and 10, the left joint forming portion 20 is connected to the flow path forming portion 11 of the valve body forming portion 10. The right joint forming portion 20 is connected to the flow path forming portion 31 of the housing forming portion 30, which will be described later. The joint forming portion 20 is equipped with a joint surface 21.

[0045] The joint surface 21 shown in Figure 10 is the surface that the joint forming portion 20 is joined to the objects to be joined (the valve body forming portion 10 and the joint forming portion 20). In this embodiment, the joint surface 21 of the left joint forming portion 20 is joined to the left joint surface 13 of the valve body forming portion 10. The joint surface 21 of the right joint forming portion 20 is joined to the first joint surface 35 of the housing portion forming portion 30, which will be described later. In this way, the joint surface 21 of the joint forming portion 20 is formed to be joinable to either the valve body forming portion 10 or the housing portion forming portion 30.

[0046] The housing section forming section 30 is the part that corresponds to the housing section 130 of the valve body 100. That is, the housing section forming section 30 is the middle part of the vanished model 1 in the left-right direction, and constitutes the part to the right of the valve body forming section 10 (the part between the valve body forming section 10 and the joint forming section 20 at the right end). The housing section forming section 30 comprises a flow path forming section 31, an equipment housing section forming section 32, a first joint surface 35, and a second joint surface 36.

[0047] The flow path forming portion 31 shown in Figures 6(a) and 7 corresponds to the flow path portion 131 of the housing portion 130. That is, the flow path forming portion 31 constitutes the lower part of the housing portion forming portion 30 and is formed in a substantially cylindrical shape that demarcates the hollow portion (flow path) that penetrates the housing portion forming portion 30 from left to right.

[0048] The equipment housing section forming section 32 is the part of the housing section 130 that corresponds to the equipment housing section 132. That is, the equipment housing section forming section 32 constitutes the upper part of the housing section forming section 30. As shown in Figures 1, 6(a), and 7, the equipment housing section forming section 32 is formed in a substantially box shape that opens upward. Also, as shown in Figures 1 and 4, the equipment housing section forming section 32 is formed in a substantially rectangular shape in plan view. The left-right and front-back dimensions of the equipment housing section forming section 32 are formed to be larger than the respective dimensions of the valve body housing section forming section 12. The equipment housing section forming section 32 comprises a compartment forming section 33 and a wall forming section 34.

[0049] The partitioned section 33 corresponds to the partitioned section 133 of the equipment housing section 132. The partitioned section 33 constitutes the side wall of the equipment housing section 32. As shown in Figure 1, a flange extending horizontally is formed at the upper end of the partitioned section 33.

[0050] The wall-forming portion 34 corresponds to the wall portion 134 of the equipment housing portion 132. The wall-forming portion 34 constitutes the bottom of the equipment housing portion 32. The wall-forming portion 34 also separates the flow path portion 31 from the partition portion 33 (the interior of the partition portion 33). The wall-forming portion 34 is provided with a hole portion 34a.

[0051] The hole 34a is a hole that penetrates the wall forming portion 34 in the vertical direction. The hole 34a is formed approximately in the center of the wall forming portion 34 in a plan view. The hole 34a connects the flow channel forming portion 31 and the partition forming portion 33. The hole 34a is formed at a position corresponding to the insertion hole 134a of the wall portion 134. The inner diameter of the hole 34a can be formed to be smaller than the inner diameter of the insertion hole 134a (see Figure 8).

[0052] As shown in Figure 9, by forming a hole 34a in the wall forming section 34, when the lost-wax model 1 is embedded in the casting sand, the casting sand on the flow path forming section 31 side and the partition forming section 33 side can be made continuous through the hole 34a. Furthermore, when casting is performed using the lost-wax model 1, a hole (cast hole) corresponding to the hole 34a is formed in the wall section 134 of the valve body 100 immediately after casting. In this embodiment, the insertion hole 134a can be formed using the above hole. Specifically, the insertion hole 134a can be formed by performing a machining process such as cutting on the hole corresponding to the hole 34a.

[0053] The first joining surface 35 shown in Figure 10 is the surface that is joined to the joining surface 21 of the joint forming section 20. In this embodiment, the housing section forming section 30 is positioned so that the first joining surface 35 faces to the right.

[0054] The second joining surface 36 is the surface that is joined to the joining surface 13 of the valve body forming portion 10. In this embodiment, the housing portion forming portion 30 is positioned such that the second joining surface 36 faces to the left.

[0055] The above-mentioned vanished model 1 is formed into a shape corresponding to the valve body 100 by joining (adhering) the joint surfaces (joint surface 13, joint surface 21, first joint surface 35, and second joint surface 36) of the valve body forming part 10, the joint forming part 20, and the housing forming part 30 together to integrate each part.

[0056] According to the vanishing model 1 described above, a valve body 100 having a housing portion 130 can be suitably manufactured. That is, if a hole 34a is not formed in the wall portion forming portion 34, the surrounding portion of the wall portion forming portion 34 will have a discontinuity in the foundry sand between the flow path portion forming portion 31 and the partition portion forming portion 33, making it prone to deformation and cracking due to vibration filling of the foundry sand and sand pressure due to reduced pressure.

[0057] On the other hand, in the lost-wax model 1 according to this embodiment, by forming a hole 34a in the wall forming section 34, the foundry sand on the flow channel forming section 31 side and the partition forming section 33 side become continuous through the hole 34a. This prevents deformation and cracking of the lost-wax model 1 (especially the area around the wall forming section 34 enclosed by the dashed line in Figure 9) due to sand pressure. Furthermore, in this embodiment, by utilizing the hole in the wall section 134 formed by providing the hole 34a in the lost-wax model 1, an insertion hole 134a through which the sensor 3 can be inserted can be formed.

[0058] Furthermore, in this embodiment, the joining surface 21 of the joint forming portion 20 is formed to be joinable to either the valve body forming portion 10 or the housing portion forming portion 30. This improves the versatility of the lost-wax model 1 (valve body forming portion 10, joint forming portion 20, and housing portion forming portion 30). Specifically, since the joint forming portion 20 can be joined to either the valve body forming portion 10 or the housing portion forming portion 30, for example, by directly joining the joint forming portion 20 to both the left and right sides of the valve body forming portion 10 without using the housing portion forming portion 30, it is possible to form a lost-wax model that can manufacture a valve body 100 without a housing portion 130.

[0059] Although the first embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention as described in the claims.

[0060] The second embodiment of the present invention will be described below with reference to Figures 11 to 17. In the following description of the second embodiment, the differences from the first embodiment will be explained, and common components will be omitted from the explanation as appropriate.

[0061] The lost model 1A according to the second embodiment differs from the lost model 1 of the first embodiment in that it has two housing portion forming portions 30. As shown in Figures 11, 12, 14, 15, and 17, the lost model 1A has housing portion forming portions 30 on both the left and right sides of the valve body forming portion 10. The pair of housing portion forming portions 30 are arranged symmetrically to each other. In addition, each of the pair of housing portion forming portions 30 is provided with a joint forming portion 20.

[0062] Lost model 1A can be formed by combining parts similar to those that constitute the lost model 1 of the first embodiment shown in Figure 10 (valve body forming part 10, joint forming part 20, and housing part forming part 30). Specifically, the second joining surface 36 of the housing part forming part 30 is joined to the joining surfaces 13 on both the left and right sides of the valve body forming part 10. In addition, the joining surface 21 of the joint forming part 20 is joined to the first joining surface 35 of the pair of housing part forming parts 30. Thus, according to this embodiment, a lost model 1A having a pair of housing part forming parts 30 can be formed using parts common to lost model 1 (valve body forming part 10, joint forming part 20, and housing part forming part 30), thereby improving the versatility of each part.

[0063] As shown in Figure 17, in this embodiment, by forming holes 34a in each wall forming portion 34 of the pair of housing forming portions 30, deformation and cracking of the lost-wax model 1A due to sand pressure during casting can be prevented, similar to the first embodiment.

[0064] According to the vanishing model 1A described above, a valve body with a pair of housing sections 130 on each of the left and right sides of the valve body 110 can be integrally molded by casting. With the above valve body, measuring instruments (sensors 3, etc.) can be housed in each of the pair of housing sections 130. This allows, for example, the same type of measuring instrument to be installed in each housing section 130 to acquire information from the upstream and downstream sides of the valve body 2 (e.g., pressure, camera images, etc.). Alternatively, for example, multiple different measuring instruments can be installed in each housing section 130 to acquire multiple different types of information (e.g., flow velocity, water quality, etc.).

[0065] As described above, the lost models 1 and 1A for the valve body according to this embodiment are Lost-wax models 1 and 1A for a valve body, which are placed in a mold 4 and can be used to manufacture a valve body 100 by being replaced by molten metal, A valve body forming portion 10 corresponding to a valve body portion 110 capable of housing the valve element 2, A joint forming section 20 corresponding to the joint 120, Displaced between the valve body forming portion 10 and the joint forming portion 20, there is a housing portion forming portion 30 corresponding to a housing portion 130 capable of housing a measuring instrument (sensor 3), It is equipped with the following features.

[0066] By configuring it in this way, a valve body 100 having a housing section 130 capable of accommodating the sensor 3 can be suitably manufactured. Specifically, by using lost-wax models 1 and 1A, the valve body 100 having the valve body 110, the joint 120, and the housing section 130 can be integrally manufactured by casting.

[0067] Furthermore, the housing portion forming portion 30 is A flow channel forming section 31 corresponding to a flow channel section 131 through which fluid (water) flows, A partition forming section 33 corresponding to a partition section 133 that is separated from the flow channel section 131, A wall forming portion 34 corresponding to the wall portion 134 that separates the flow channel portion 131 and the partition portion 133, It is equipped with, The wall-forming portion 34 is The device is equipped with a hole 34a that connects the flow channel forming portion 31 and the partition forming portion 33.

[0068] By configuring it in this way, a valve body 100 having a housing section 130 capable of accommodating the sensor 3 can be suitably manufactured. Specifically, by forming a hole 34a in the wall section forming section 34, the casting sand on the flow path section forming section 31 side and the partition section forming section 33 side becomes continuous through the hole 34a. This prevents deformation and cracking of the lost models 1 and 1A (especially the peripheral portion of the wall section forming section 34) due to sand pressure.

[0069] Furthermore, the valve body forming portion 10, the joint forming portion 20, and the housing portion forming portion 30 are joined to each other. The joint forming portion 20 is It has a joining surface 21 that can be joined to either the valve body forming portion 10 or the housing portion forming portion 30.

[0070] This configuration improves the versatility of the lost-wax models 1 and 1A (valve body forming section 10, joint forming section 20, and housing section forming section 30). Specifically, since the joint forming section 20 can be joined to either the valve body forming section 10 or the housing section forming section 30, for example, by directly joining the joint forming section 20 to both the left and right sides of the valve body forming section 10 without using the housing section forming section 30, it is possible to form a lost-wax model that can manufacture a valve body without a housing section 130.

[0071] Furthermore, according to this embodiment, a lost-wax model 1A comprising a pair of housing parts 30 can also be formed using the valve body forming part 10, the joint forming part 20, and the housing part forming part 30.

[0072] Furthermore, the sensor 3 according to this embodiment is one form of the measuring instrument according to the present invention.

[0073] Although embodiments of the present invention have been described above, the present invention is not limited to the above configurations, and various modifications are possible within the scope of the invention as described in the claims.

[0074] For example, the specific configurations of the parts (valve body forming part 10, joint forming part 20, and housing part forming part 30) of the lost models 1 and 1A shown in the above embodiments are just examples, and the shapes of the above parts can be changed as desired.

[0075] Furthermore, although the above embodiments show a lost model 1 with one housing section forming section 30 and a lost model 1A with two housing section forming sections 30, the present invention is not limited thereto. The number of parts constituting the lost model 1 can be set as appropriate.

[0076] Furthermore, while the above embodiments show examples in which the valve body forming part 10, the joint forming part 20, and the housing forming part 30, which are formed separately from each other, are joined together to form the lost-wax models 1 and 1A, the present invention is not limited thereto. For example, each part of the lost-wax models 1 and 1A may be formed integrally.

[0077] Furthermore, while the above embodiments show examples in which measuring instruments are directly housed in the housing section 130 of the valve body 100, the present invention is not limited thereto. For example, a water intake device capable of taking in water flowing through the flow path section 131 may be provided in the housing section 130, and measuring instruments located outside the housing section 130 may be connected to the water intake device, thereby indirectly housing the measuring instruments in the housing section 130.

[0078] Furthermore, although the valve body 100 (valve device) is connected to a water pipe in each of the above embodiments, the application of the valve body 100 (valve device) is not limited to water pipes, but can be applied to various types of equipment. Also, the fluid flowing through the valve body 100 is not limited to water, but can be various fluids. [Explanation of symbols]

[0079] 1 Vanishing model 10 Valve body forming part 20 Joint forming section 30 Housing section forming section

Claims

1. A lost-wax model for a valve body, which is placed in a mold and replaced by molten metal to manufacture the valve body, A valve body forming portion corresponding to a valve body portion capable of housing a valve element, A joint forming section corresponding to the joint, A housing portion forming portion is disposed between the valve body forming portion and the joint forming portion, and has a shape corresponding to a housing portion that forms a space capable of housing measuring instruments, It is equipped with, The aforementioned housing portion forming portion is A flow channel forming section corresponding to a fluid flow channel, A side wall is formed to partition the space in which measuring instruments are housed, and a partition forming section has a shape corresponding to the partition section that is partitioned from the flow path section, A bottom portion is formed to partition the space in which measuring instruments are housed, and a wall-forming portion has a shape corresponding to the wall portion that partitions the flow path portion and the partition portion, It is equipped with, The wall-forming portion is, It is provided with a hole that connects the flow channel forming portion and the partition forming portion, The aforementioned hole is A vanished model for a valve body, formed in the center of the wall-forming portion when viewed in the direction of communication between the flow path forming portion and the partition forming portion.

2. The valve body forming portion, the joint forming portion, and the housing portion forming portion are joined to each other, The aforementioned joint forming portion is It has a joining surface that can be joined to either the valve body forming portion or the housing portion forming portion. Lost-wax model for valve body according to claim 1.

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