Valve box

Abstract

To provide a valve box that can be enhanced in strength while preventing stress from concentrating without lowering fluidity in molding.SOLUTION: There is provided a valve box 1 that is molded, and comprises: a valve box body 2 which has an upper opening 11 for housing a valve body from above, and is in a box shape; a pair of trunk parts 3 which have one-end sides connected to a front part 14 and a rear part 15 of the valve box body 2 to form a flow passage; and reinforcement parts 4 which are provided at intersection part 13 for the trunk parts 3 at the front part 14 and rear part 15 of the valve box body 2, wherein the reinforcement part 4 comprises an outer peripheral thick part 21 provided successively in the circumferential direction of the intersection part 13 and an upper thick part 22 in a laterally long block shape provided above the front part 14 and rear part 15 of the valve box body 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a valve box.

Background Art

[0002] For example, Patent Document 1 discloses a partition valve including a valve box and a valve body. The valve box includes a valve box body having a box shape and a pair of body portions connected to the valve box body. A plate-like rib that projects outward across the circumferential direction of the valve box body is formed on the upper portion of the valve box body. Further, in the valve box, ribs are also formed at the intersection where the valve box body and the body portion intersect. By providing these ribs, the strength of the valve box can be increased.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since it is a plate-like rib, the flow of molten metal may be inhibited during casting, and the forming accuracy may be reduced. Further, when the body portion becomes long, the rib also becomes long, so the degree of freedom in design is reduced. In the form where the rib is provided up to the middle of the body portion, there is a problem that stress concentrates on that portion.

[0005] In view of such problems, an object of the present invention is to provide a valve box that can increase the strength while preventing the flow of molten metal during casting and preventing stress concentration.

Means for Solving the Problems

[0006] In order to achieve the above object, the present invention provides a valve box including a valve box body having a box shape with an upper opening for accommodating a valve body from above, a pair of barrel portions each having one end connected to the front and rear portions of the valve box body to form a flow path, and reinforcing portions provided at the intersections with the barrel portions at the front and rear portions of the valve box body. The valve box is formed by casting, and the reinforcing portion includes an outer peripheral wall thickness portion continuously provided in the circumferential direction of the intersection portion, and horizontally long block-shaped upper wall thickness portions provided on the upper sides of the front and rear portions of the valve box body.

[0007] According to the present invention, since the outer peripheral wall thickness portion and the upper wall thickness portion are provided, the strength can be enhanced, and in particular, strong earthquake resistance can be exhibited against bending and displacement in the pipe axis direction. Further, since the outer peripheral wall thickness portion and the upper wall thickness portion are formed in a block shape, it is possible to prevent the inhibition of the molten metal flow during casting. Further, since the outer peripheral wall thickness portion and the upper wall thickness portion are provided so as to surround the outer periphery of the barrel portion, stress can be dispersed, and it is not necessary to extend the reinforcing portion to the tip end portion of the barrel portion.

[0008] Further, it is preferable that the reinforcing portion includes vertically long block-shaped side wall thickness portions provided along the circumferential direction on both the left and right sides of the front and rear portions of the valve box body.

[0009] According to the present invention, the non-uniform stress related to the intersection portion is further dispersed by the side wall thickness portions provided on both the left and right sides, and a decrease in the joint strength between the valve box body and the barrel portion can be prevented. Further, since the side wall thickness portions are formed in a block shape, it is possible to prevent the inhibition of the molten metal flow during casting.

[0010] Further, it is preferably integrally formed by casting. According to the present invention, the strength can be enhanced, and the valve box can be easily formed.

Advantages of the Invention

[0011] According to the valve box of the present invention, it is possible to enhance the strength while preventing stress concentration without inhibiting the molten metal flow during casting.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

FORM FOR CARRYING OUT THE INVENTION

[0013] Hereinafter, with reference to the attached drawings, the valve box according to this embodiment will be described. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate. In the description, "front-rear", "left-right", and "up-down" follow the arrows in FIG. 1.

[0014] As shown in FIGS. 1 to 3, the valve box 1 includes a valve box main body 2, body portions 3, 3, and reinforcing portions 4, 4. The valve box 1 is a member used for valves such as a gate valve and a valve body detachment type butterfly valve. The valve box 1 houses a valve body (not shown) inside, and can circulate or block fluid (such as water) by opening and closing a flow path. The valve box 1 is integrally formed by casting. Note that the valve box 1 may be manufactured by joining each part after individually forming each part.

[0015] The valve box main body 2 includes a hollow portion that houses a valve body (not shown) inside, and is open upward through an upper opening 11. A flange portion 12 that protrudes outward is formed around the upper opening 11 of the valve box main body 2. Further, the valve box main body 2 has a box shape and includes a front portion 14, a rear portion 15, a right side portion 16, a left side portion 17, and a bottom portion 18.

[0016] The front part 14 is a part that constitutes the front side of the valve box body 2 and is perpendicular to the axis in the front-rear direction. The rear part 15 is a part that constitutes the rear side of the valve box body 2 and is spaced apart from and opposed to the front part 14. The right side part 16 is a part that constitutes the right side of the valve box body 2 and connects the front part 14 and the rear part 15. The left side part 17 is a part that constitutes the left side of the valve box body 2 and connects the front part 14 and the rear part 15.

[0017] The bottom part 18 is a part that constitutes the lower part of the valve box body 2 and is curved so as to protrude downward. The bottom part 18 is continuous with the front part 14, the rear part 15, the right side part 16, and the left side part 17 and closes the lower side of the valve box.

[0018] The body parts 3, 3 are cylindrical and are respectively provided perpendicular to the front part 14 and the rear part 15 of the valve box body 2 and communicate with the hollow part of the valve box body 2. The body part 3 is a part that serves as a flow path through which fluid flows. Another pipe is connected to the tip side of the body part 3 via a joint.

[0019] The reinforcing parts 4, 4 are respectively provided on the front part 14 and the rear part 15 and are parts that reinforce the valve box body 2. As shown in FIG. 3, since the front and rear of the reinforcing part 4 are symmetric, the front side will be described here.

[0020] The reinforcing part 4 includes an outer peripheral thick part 21, an upper thick part 22, and side thick parts 23, 23. As shown in FIG. 4, the part where the body part 3 and the front part 14 intersect (the corner part) is defined as the intersection part 13. The intersection part 13 is formed along the outer peripheral surface of the body part 3.

[0021] The outer peripheral thick part 21 is a thick part for reinforcing the intersection part 13 and is continuously formed along the circumferential direction of the intersection part 13. In FIG. 4, a part of the cross-section of the outer peripheral thick part 21 is hatched. The outer peripheral thick part 21 has a substantially triangular shape in side cross-section view and a ring shape in front view. The inclined surface 21a of the outer peripheral thick part 21 is formed to be inclined from the front part 14 to the body part 3.

[0022] As shown in FIG. 1, the upper thick portion 22 is a thick portion that reinforces the upper side of the front portion 14 of the valve box body 2 while overlapping with the outer peripheral thick portion 21, and has a horizontally long block shape (substantially kamaboko shape). The upper thick portion 22 is formed so as to cover the region from the trunk portion 3 to the flange portion 12 in the front portion 14. The left and right ends of the upper thick portion 22 are chamfered obliquely for weight reduction. The thickness of the upper thick portion 22 is larger than the thickness of the outer peripheral thick portion 21.

[0023] As shown in FIG. 1, the front surface of the upper thick portion 22 is a protruding surface 22a, which is formed to protrude forward from the front portion 14 to the trunk portion 3. Further, a concave portion 22b that is concave downward is provided below the upper thick portion 22, and is formed along the shape of the trunk portion 3. That is, by providing the concave portion 22b, the upper thick portion 22 can be formed in a wide range of the upper portion of the front portion 14 while avoiding interference with the trunk portion 3.

[0024] The side thick portions 23, 23 are thick portions for reinforcing the left and right sides of the front portion 14 of the valve box body 2, and have a vertically long block shape. As shown in FIG. 2, the side thick portions 23 are symmetric with respect to the left and right, and are formed so as to cover the regions from the trunk portion 3 to the right side portion 16 and the left side portion 17 in the front portion 14, respectively. Further, the side thick portions 23 are curved along the shape of the trunk portion 3 while overlapping with the outer peripheral thick portion 21. The thickness of the side thick portions 23 is larger than the thickness of the outer peripheral thick portion 21.

[0025] As shown in FIG. 2, when a horizontal line passing through the pipe axis C is defined as a virtual horizontal line X, the side thick portion 23 is formed such that the vertical opening angle θ from the virtual horizontal line X is in the range of, for example, 20 to 45°. As shown in FIG. 5, the cross-sectional shape of the side thick portion 23 is substantially trapezoidal. The inclined surface 23a of the side thick portion 23 is inclined from the bottom portion 18 and the front portion 14 to the trunk portion 3.

[0026] Here, for example, when an earthquake or ground fissure occurs, a large stress acts on the valve box 1. In addition, the stress transmitted from the pipe connected to the valve box 1 is also applied, and a combined stress acts on the valve box 1. Therefore, in particular, stress tends to concentrate on the upper part of the front portion 14 (the region between the body portion 3 and the flange portion 12 in the front portion 14) and the intersection portion 13, and damage is likely to occur.

[0027] In this regard, according to the valve box 1 according to the present embodiment, since the outer peripheral thick portion 21 and the upper thick portion 22 are provided, the strength can be increased, and in particular, strong earthquake resistance can be exhibited against bending and displacement in the pipe axis direction. Further, by providing the upper thick portion 22 and the outer peripheral thick portion 21 at the upper part of the front portion 14 (the region between the body portion 3 and the flange portion 12 in the front portion 14) and the intersection portion 13 where damage is likely to occur, effective reinforcement can be achieved. Further, by providing the inclined surface 21a in the outer peripheral thick portion 21, stress is easily transmitted. Further, since the outer peripheral thick portion 21 and the upper thick portion 22 are provided so as to surround the outer periphery of the body portion 3, stress can be dispersed, and it is not necessary to extend the reinforcing portion 4 to the tip of the body portion 3.

[0028] In addition, since the outer peripheral thick portion 21, the upper thick portion 22, and the side thick portion 23 are each formed in a block shape, it is possible to prevent the inhibition of the molten metal flow during casting. Thereby, the molding accuracy of the valve box 1 can be improved.

[0029] Further, the non-uniform stress acting on the intersection portion 13 is further dispersed by the side thick portions 23 provided on both the left and right sides, and a decrease in the joining strength between the valve box body 2 and the body portion 3 can be prevented. The side thick portion 23 can effectively transmit stress particularly against the tensile stress acting on the body portion 3. Further, by providing the inclined surface 23a in the side thick portion 23, stress is more easily transmitted.

[0030] In addition, the valve box 1 can be easily manufactured by integrally molding it by casting.

[0031] Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, each of the outer peripheral thick portions 21, the upper thick portion 22, and the side thick portions 23 may have other shapes as long as they are block-shaped. Also, the side thick portions 23, 23 may be omitted.

Explanation of Reference Numerals

[0032] 1 Valve box 2 Valve box body 3 Barrel portion 4 Reinforcing portion 11 Upper opening 12 Flange portion 21 Outer peripheral thick portion 22 Upper thick portion 23 Side thick portion

Claims

1. A valve box body in a box shape with an upper opening for accommodating a valve body from above, A pair of body parts with one end connected to the front and rear parts of the valve box body respectively to form a flow path, At the front and rear parts of the valve box body, a reinforcing part provided at the intersection with the body part, and is a valve box formed by casting, The reinforcing part is, An outer peripheral wall thickness part continuously provided in the circumferential direction of the intersection part, A horizontally long block-shaped upper wall thickness part provided on the upper sides of the front and rear parts of the valve box body, and is characterized by a valve box.

2. The reinforcing part is, On the left and right sides of the front and rear parts of the valve box body, it is provided with vertically long block-shaped side wall thickness parts provided along the circumferential direction, and is characterized by the valve box according to claim 1.

3. The valve box according to claim 1 or claim 2, characterized in that it is integrally formed by casting.

Images