Valve structure, valve, and method of assembling valve structure

Abstract

The object of the invention of the present application is to provide a valve structure and a valve that are easily assembled. The butterfly valve (12) is configured to include the following components: a valve box (14) having a protruding portion (18) protruding from a cylindrical portion (16); a seat ring (24) whose cylindrical portion (26) is disposed within the cylindrical portion (16) of the valve box (14); a valve element (30) disposed within the cylindrical portion (26) of the seat ring (24); a neck member (40) connected to the protruding portion (18) of the valve box (14); and a valve stem (32) whose top end in the through direction is fixed to the valve element (30). The valve box (14) is configured such that by connecting two valve box components (1) and (2), the cylindrical portion (26) of the seat ring (24) is disposed within the cylindrical portion (16) of the valve box (14).

Description

Technical Field

[0001] The present invention relates to a valve structure and a valve constituting a valve such as a butterfly valve. Background Art

[0002] Conventionally, a butterfly valve (valve) has been used to close or open against the flow of a fluid. As Figure 8 an example, a butterfly valve 100 is shown. The butterfly valve 100 includes a valve box 104, a seat ring 110, a valve element 108, a neck member 112, and a valve stem 106. The valve box 104 has a cylindrical portion 103 and a protruding portion 105 protruding from the cylindrical portion 103. The seat ring 110 has a cylindrical portion 109 and is configured such that the cylindrical portion 109 is disposed so as to be inserted into the cylindrical portion 103 of the valve box 104. The valve element 108 is disposed within the cylindrical portion 109 of the seat ring 110. The inner hollow portion of the cylindrical portion 109 constitutes a flow path 102. The neck member 112 has a flange (fixing portion) 118 fixed to a valve drive portion (not shown) having a rotation drive member, a control member, etc., and the neck member 112 is configured to be connected to the protruding portion 105 of the valve box 104. The valve stem 106 penetrates the neck member 112, the protruding portion 105 of the valve box 104, and the seat ring 110 rotatably, and the top end (not shown) in the penetration direction is fixed to the valve element 108 and is configured to rotate together with the valve element 108 about a rotation center C0. The seat ring 110 has a valve seat portion 114 against which the valve element 108 abuts. The lower portion of the cylindrical portion 116 of the neck member 112 is inserted into the protruding portion 105 of the valve box 104.

[0003] In the assembly process of the butterfly valve 100, in order to insert the seat ring 110 into the cylindrical portion 103 of the valve box 104, it is necessary to deform the shape of the seat ring 110. For example, as Figure 9 shown, it is necessary to hold a part 120 of the seat ring 110 and twist it as shown by an arrow A to preliminarily deform the seat ring 110 into a shape that can be inserted into the cylindrical portion 103 and press it into the cylindrical portion 103 for disposition. The seat ring 110 is formed of a rubber such as EPDM (ethylene propylene diene monomer rubber), but the cylindrical portion 109 is thick and it is difficult to deform the seat ring 110. Therefore, it is difficult to assemble the butterfly valve 100. In addition, there is a document related to the installation of the seat ring included in the butterfly valve (see Patent Document 1). However, there is no document related to the present invention.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Laid-Open No. 10-153266 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] An object of the invention of the present application is to provide a valve structure and a valve that are easily assembled.

[0009] Solutions for Solving the Problems

[0010] The valve structure of the invention of the present application is a valve structure constituting a valve, and the valve includes:

[0011] A valve box having a cylindrical portion and a connecting portion continuous with the cylindrical portion;

[0012] A seat ring having a cylindrical portion disposed within the cylindrical portion of the valve box;

[0013] A valve element disposed within the cylindrical portion of the seat ring;

[0014] A neck member having: a fixing portion fixed to a valve driving portion; and a connecting portion directly or indirectly connected to the connecting portion of the valve box; and

[0015] A valve stem rotatably passing through the neck member, the connecting portion of the valve box, and the seat ring, with the top end in the passing direction fixed to the valve element. The valve structure is characterized in that

[0016] The valve structure is configured to include:

[0017] The valve box; and

[0018] The seat ring,

[0019] The valve box is composed of a plurality of valve box constituent parts,

[0020] By connecting the plurality of valve box constituent parts, the cylindrical portion of the seat ring is disposed within the cylindrical portion of the valve box.

[0021] In addition, the valve structure of the invention of the present application is characterized in that in the valve structure,

[0022] The valve structure includes:

[0023] The valve box;

[0024] The seat ring;

[0025] A substantially annular space portion provided between the valve box and the seat ring; and

[0026] A substantially annular heat insulating member disposed within the space portion.

[0027] In addition, the valve structure of the invention of the present application is characterized in that in the valve structure,

[0028] The plurality of valve box components are arranged in contact with the outer peripheral surface of the heat insulating member.

[0029] In addition, the valve structure of the present invention is characterized in that, in the valve structure, an engaging projection is provided at a connecting portion of one valve box component, and an engaging recess that engages with the engaging projection is provided at a connecting portion of another valve box component.

[0030] The valve structure of the present invention is characterized in that, in the valve structure, the outer peripheral surface of the heat insulating member and the inner peripheral surface of the valve box are arc-shaped in a cross section perpendicular to the rotation center of the valve stem and are in contact with each other.

[0031] In addition, the valve structure of the present invention is characterized in that, in the valve structure, the outer peripheral surface of the seat ring and the inner peripheral surface of the valve box are arc-shaped in a cross section perpendicular to the rotation center of the valve stem and are in contact with each other.

[0032] The valve structure of the present invention is characterized in that, in the valve structure, the seat ring has a valve seat portion against which the outer peripheral surface of the valve element abuts.

[0033] The valve seat portion has a concave curved surface that is recessed on the valve element side.

[0034] The valve element is configured to rotate about the rotation center of the valve stem, the outer peripheral surface abuts against the concave curved surface, and stops after the sealing amount of the outer peripheral surface entering the concave curved surface gradually increases.

[0035] The valve of the present invention includes:

[0036] A valve box having a cylindrical portion and a connecting portion continuous with the cylindrical portion;

[0037] A seat ring having a cylindrical portion that is disposed inside the cylindrical portion of the valve box;

[0038] A valve element disposed inside the cylindrical portion of the seat ring;

[0039] A neck member having: a fixing portion fixed to a valve driving portion; and a connecting portion directly or indirectly connected to the connecting portion of the valve box; and

[0040] A valve stem that penetrates the neck member, the connecting portion of the valve box, and the seat ring rotatably, and the top end in the penetration direction is fixed to the valve element. The valve is characterized in that

[0041] It has the valve structure.

[0042] The assembling method of the present invention is the assembling method of the valve structure, and is characterized in that

[0043] The assembling method includes:

[0044] a step in which two valve box constituent parts approach each other while sliding along the heat insulating member;

[0045] a step in which an engaging projection of one valve box constituent part engages with an engaging recess of the other valve box constituent part; and

[0046] a step in which the two valve box constituent parts abut against each other.

[0047] A valve heat insulation structure, which is the valve heat insulation structure of the valve of the present invention in which the valve box is composed of a plurality of valve box constituent parts, and the valve includes:

[0048] a valve box having a cylindrical portion and a connecting portion continuous with the cylindrical portion;

[0049] a seat ring having a cylindrical portion disposed inside the cylindrical portion of the valve box;

[0050] a valve element disposed inside the cylindrical portion of the seat ring;

[0051] a neck member having: a fixing portion fixed to a valve driving portion; and a connecting portion directly or indirectly connected to the connecting portion of the valve box; and

[0052] a valve stem rotatably penetrating through the neck member, the connecting portion of the valve box, and the seat ring, with the top end in the penetrating direction fixed to the valve element, and the valve heat insulation structure is characterized in that

[0053] the valve heat insulation structure includes:

[0054] the valve box;

[0055] the seat ring; and

[0056] a substantially annular space portion provided between the valve box and the seat ring.

[0057] In addition, the valve heat insulation structure of the valve of the present invention is characterized in that, in the valve heat insulation structure, a substantially annular heat insulating member is provided in the space portion.

[0058] In addition, the valve heat insulation structure of the valve of the present invention is characterized in that, in the valve heat insulation structure, the heat insulating member is formed by being radially divided into a plurality of parts.

[0059] A valve heat insulation structure, which is the valve heat insulation structure of the valve of the present invention in which the valve box is composed of a plurality of valve box constituent parts, and the valve includes:

[0060] A valve box having a cylindrical portion and a connecting portion continuous with the cylindrical portion;

[0061] A seat ring having a cylindrical portion disposed within the cylindrical portion of the valve box;

[0062] A valve element disposed within the cylindrical portion of the seat ring;

[0063] A neck member having: a fixing portion fixed to a valve driving portion; and a connecting portion directly or indirectly connected to the connecting portion of the valve box; and

[0064] A valve stem rotatably passing through the neck member, the connecting portion of the valve box, and the seat ring, with the top end in the passing direction fixed to the valve element. The valve heat insulation structure is characterized in that

[0065] The valve heat insulation structure includes:

[0066] The valve box;

[0067] The neck member; and

[0068] A heat-insulating clamping member having heat insulation property, clamped between the connecting portion of the valve box and the neck member.

[0069] In the valve of the present invention where the valve box is composed of multiple valve box components, it is characterized in that

[0070] The valve includes:

[0071] A valve box having a cylindrical portion and a connecting portion continuous with the cylindrical portion;

[0072] A seat ring having a cylindrical portion disposed within the cylindrical portion of the valve box;

[0073] A valve element disposed within the cylindrical portion of the seat ring;

[0074] A neck member having: a fixing portion fixed to a valve driving portion; and a connecting portion directly or indirectly connected to the connecting portion of the valve box;

[0075] A valve stem rotatably passing through the neck member, the connecting portion of the valve box, and the seat ring, with the top end in the passing direction fixed to the valve element; and

[0076] A substantially annular space portion provided between the valve box and the seat ring.

[0077] In addition, in the valve of the present invention, it is characterized in that a substantially annular heat-insulating member is provided within the space portion.

[0078] Further, in the valve of the present invention, it is characterized in that the heat insulating member is radially divided into a plurality of parts and constituted.

[0079] Further, in the valve of the present invention, it is characterized in that the valve is provided with an auxiliary valve stem, which penetrates the seat ring rotatably from the direction opposite to the valve stem, and the top end of the penetration direction is fixed to the valve core.

[0080] The heat insulating member holds the auxiliary valve stem rotatably.

[0081] In the valve of the present invention in which the valve box is composed of a plurality of valve box components, it is characterized in that the valve is provided with:

[0082] A valve box having a cylindrical portion and a connecting portion continuous with the cylindrical portion;

[0083] A seat ring having a cylindrical portion disposed inside the cylindrical portion of the valve box;

[0084] A valve core disposed inside the cylindrical portion of the seat ring;

[0085] A neck member having: a fixing portion fixed to the valve driving portion; and a connecting portion directly or indirectly connected to the connecting portion of the valve box;

[0086] A valve stem rotatably penetrating the neck member, the connecting portion of the valve box, and the seat ring, and the top end of the penetration direction being fixed to the valve core; and

[0087] A heat insulating clamping member clamped between the connecting portion of the valve box and the neck member.

[0088] Effects of the Invention

[0089] According to the present invention, by arranging a plurality of valve box components on the outer periphery of the cylindrical portion of the seat ring and connecting them, the cylindrical portion of the seat ring is arranged and embedded in the cylindrical portion of the valve box. Therefore, it is not necessary to deform the seat ring in order to embed the cylindrical portion of the seat ring into the cylindrical portion of the valve box. Thus, it is easy to assemble the seat ring and the valve box, and the assembly of the valve becomes easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] Figure 1 It is a front view sectional view showing the valve structure and the valve of the present invention.

[0091] Figure 2 It is showing the assembly Figure 1 The exploded perspective view of the state of the valve shown.

[0092] Figure 3 It is for explaining Figure 1A cross-sectional view showing the function of the valve structure shown, a partial top view showing an omission near the upper end of the seat ring Figure 3 The (b) of [] shows a front view cross-section near the upper end of the seat ring Figure 3 The (c) of [] shows a front view cross-section near the lower end of the seat ring

[0093] Figure 4 It is a cross-sectional view of the A-A cutting part showing another embodiment of the valve structure of the present invention

[0094] Figure 5 It is used to illustrate Figure 4 A conceptual diagram of an example of a method for forming the concave curved surface of the seat ring of the valve structure of []

[0095] Figure 6 The (a) of [] is a cross-sectional view showing another embodiment of the valve structure of the present invention Figure 6 The (b) of [] is showing Figure 6 A cross-sectional view showing the function of the valve structure of the (a) of [] Figure 6 The (c) of [] is a cross-sectional view showing a conventional valve structure Figure 6 The (d) of [] is showing Figure 6 A cross-sectional view showing the function of the valve structure of the (c) of []

[0096] Figure 7 The (a) of [] is a cross-sectional view showing another embodiment of the valve structure of the present invention Figure 7 The (b) of [] is a cross-sectional view showing a conventional valve structure

[0097] Figure 8 It is a perspective view showing a conventional valve

[0098] Figure 9 It is a conceptual diagram for explaining the problems of a conventional valve Detailed implementation manners

[0099] Based on the drawings, embodiments of the valve structure and butterfly valve (valve) of the present invention are described. In [] and [], the reference numeral 200 is the valve structure of the present invention, and the reference numeral 12 is the valve of the present invention. Hereinafter, based on [] and [], the structures of the valve structure 200 and the butterfly valve 12 are described Figure 1 and Figure 2 The butterfly valve 12 of the present invention is composed of a valve box 14, a seat ring 24, a valve core 30, a neck member 40, a valve stem 32, and a heat insulation member 58 Figure 1 and Figure 2 The structures of the valve structure 200 and the butterfly valve 12 are described

[0100] (Structure)

[0101] The butterfly valve 12 of the present invention includes a valve box 14, a seat ring 24, a valve core 30, a neck member 40, a valve stem 32, and a heat insulation member 58

[0102] (Valve box 14)

[0103] First, the butterfly valve 12 includes a valve box 14, and the valve box 14 has: a cylindrical portion 16; and a protruding portion (connecting portion) 18 that is continuous with the cylindrical portion 16 and protrudes from the cylindrical portion 16 and has a hollow portion 76. The valve box 14 is composed of two valve box constituent parts 14(1) and 14(2), and these two valve box constituent parts 14(1) and 14(2) are arranged in such a way that the inner peripheral surface 14I thereof contacts the outer peripheral surface 59S of the protruding portion (rib) 59 of the heat insulating member 58 described later. The inner peripheral surface 14I and the outer peripheral surface 59S have an arc shape and contact each other. In addition, the valve box 14 is configured such that by connecting the two valve box constituent parts 14(1) and 14(2), the cylindrical portion 26 of the seat ring 24 described later is arranged and inserted into the cylindrical portion 16 of the valve box 14. The valve box constituent parts 14(1) and 14(2) are connected by bolts 20 and nuts 22. The valve box 14 is formed of aluminum (pure aluminum or aluminum alloy). The valve box 14 may also be formed of a metal other than aluminum. A locking projection 204 ( Figure 2 as shown) is provided on the protruding portion 18 of the valve box constituent part 14(1), and a locking recess (not shown) that engages with the locking projection 204 is provided on the protruding portion 18 of the valve box constituent part 14(2). In addition, a locking recess 206 ( Figure 2 as shown) is provided on the protruding portion 18 of the valve box constituent part 14(1), and a locking recess (not shown) that engages with the locking recess 206 is provided on the protruding portion 18 of the valve box constituent part 14(2).

[0104] (Seat ring 24 and flow path 27)

[0105] The butterfly valve 12 includes a seat ring 24, and the seat ring 24 has a cylindrical portion 26, and the cylindrical portion 26 is arranged in the cylindrical portion 16 of the valve box 14. The seat ring 24 is formed of rubber or resin. The seat ring 24 is formed of, for example, EPDM (ethylene propylene diene monomer rubber) or NBR (nitrile butadiene rubber), and may also be formed of other rubber or resin. The seat ring 24 has two protruding portions 25 that sandwich the heat insulating member 58 described later in the Y-axis direction (flow path direction). The seat ring 24 has a valve seat portion 28 against which the valve element 30 described later abuts. The valve seat portion 28 is a belt-shaped portion that protrudes and bends from the inner surface 26I of the cylindrical portion 26. The cross-sectional shape of the valve seat portion 28 is not particularly limited. The inner hollow portion of the cylindrical portion 26 constitutes the flow path 27.

[0106] (Valve element 30)

[0107] The butterfly valve 12 includes a valve element 30 that is arranged in the cylindrical portion 26 of the seat ring 24. The valve element 30 is substantially disc-shaped or substantially circular plate-shaped. The valve element 30 is formed of stainless steel. The valve element 30 may also be formed of a metal other than stainless steel. The valve element 30 has a fixing hole 34 into which the valve stem 32 described later is inserted and fixed, and a fixing hole 38 into which the auxiliary valve stem 36 described later is inserted and fixed.

[0108] (Neck member 40)

[0109] The butterfly valve 12 is provided with a neck member 40 which has: a flange (fixing portion) 42 that is fixed to the valve drive portion 46 by bolts (not shown); and a cylindrical connecting portion 44 that is indirectly connected to the protruding portion 18 of the valve box 14. The neck member 40 is formed of aluminum and may also be formed of a metal other than aluminum. The valve drive portion 46 has a rotary drive member, a control member, etc. for rotationally driving the valve element 30 and a valve stem 32 described later. The valve drive portion 46 uses a known method such as a lever type, a gear type, a cylinder type, an electric type, etc. The connecting portion 44 is fixed to the protruding portion 18 of the valve box 14 by bolts 78 with a clamping member 48 described later interposed therebetween. A space 43 in which air having a low thermal conductivity exists is provided in the flange 42. As a result, the heat insulation effect between the flange 42 and the valve drive portion 46 can be improved.

[0110] (Valve stem 32)

[0111] The butterfly valve 12 is provided with a valve stem 32 which penetrates the neck member 40, a clamping member 48 described later, the valve box 14, and the seat ring 24 in a rotatable manner, and the tip 52 in the penetration direction is fixed to the valve element 30. The valve stem 32 is formed of stainless steel and may also be formed of a metal other than stainless steel. The rear end 54 in the penetration direction of the valve stem 32 is fixed to a rotary shaft 56 that is rotated by a rotary drive member. The rotary shaft 56, the valve stem 32, and the valve element 30 are integrally rotated about the rotation center C1 relative to the valve box 14, the seat ring 24, etc. by the valve drive portion 46. The valve stem 32 has a hollow portion 55 in which air having a low thermal conductivity exists. This is to insulate the valve stem 32 from the rotary shaft 56.

[0112] (Space portion 70 and heat insulation member 58)

[0113] The butterfly valve 12 has a substantially annular space portion 70 provided between the cylindrical portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24. The butterfly valve 12 is provided with a substantially annular heat insulating member 58 in the space portion 70 between the cylindrical portion 16 and the cylindrical portion 26. The heat insulating member 58 is formed of a resin having heat insulating properties, for example, formed of POM (polyoxymethylene), and may also be formed of a resin having heat insulating properties other than POM. The heat insulating member 58 is sandwiched between the cylindrical portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24, and is also sandwiched between the two bulging portions 25 of the seat ring 24. The heat insulating member 58 is constituted by combining heat insulating member constituent parts 58(1), 58(2), 58(3), and 58(4). The heat insulating member constituent parts 58(1), 58(2), 58(3), and 58(4) are arranged and combined in a clockwise direction to form a substantially annular shape. That is, the heat insulating member 58 is radially divided into four heat insulating member constituent parts 58(1), 58(2), 58(3), and 58(4). The heat insulating member constituent parts 58(1), 58(2), 58(3), and 58(4) each have: a contact plate 57 that contacts the cylindrical portion 26 of the seat ring 24; a plurality of arc-shaped bulging portions 59 that bulge from the contact plate 57 toward the valve box 14; and a plurality of heat dissipation fins 61 that are continuous with the contact plate 57 and two opposing bulging portions 59. A plurality of spaces (voids without members) surrounded by two opposing bulging portions 59 among the plurality of bulging portions 59 and two opposing heat dissipation fins 61 among the plurality of heat dissipation fins 61 are formed. Air having a lower thermal conductivity can exist in each of these spaces respectively.

[0114] The heat insulating member constituent part 58(1) is provided with a hole 62 into which the valve stem 32 is inserted. The heat insulating member constituent part 58(1) is sandwiched between the cylindrical portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24, the valve stem 32 is inserted into the hole 62, and the heat insulating member constituent part 58(1) is clamped by the two bulging portions 25 of the seat ring 24, thereby restricting the movement of the heat insulating member constituent part 58(1) relative to the valve box 14, etc. in the XYZ directions. The heat insulating member constituent part 58(3) is provided with a hole 64 into which an auxiliary valve stem 36 (to be described later) is inserted. In addition, in the present application specification, the case of passing through is referred to as a "hole", and the case of not passing through and having a bottom surface is referred to as a "hole". The hole 64 in the heat insulating member constituent part 58(3) holds the auxiliary valve stem 36 so that it can rotate. The heat insulating member constituent part 58(3) is sandwiched between the cylindrical portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24, the auxiliary valve stem 36 is inserted into the hole 64, and the heat insulating member constituent part 58(3) is clamped by the two bulging portions 25 of the seat ring 24, thereby restricting the movement of the heat insulating member constituent part 58(3) relative to the valve box 14, etc. in the XYZ directions.

[0115] The heat-insulating component constituting parts 58(2) and 58(4) are respectively sandwiched between the heat-insulating component constituting part 58(1) and the heat-insulating component constituting part 58(3). The heat-insulating component constituting parts 58(2) and 58(4) are sandwiched between the cylindrical part 16 of the valve box 14 and the cylindrical part 26 of the seat ring 24, and are clamped by the two bulging parts 25 of the seat ring 24, and are sandwiched between the heat-insulating component constituting part 58(1) and the heat-insulating component constituting part 58(3), thereby restricting the heat-insulating component constituting parts 58(2) and 58(4) from moving relative to the valve box 14, etc. in the XYZ directions. Therefore, it can be set to the following state, that is, the heat-insulating component constituting part 58(1) is pre-installed on the cylindrical part 26 of the seat ring 24 and the heat-insulating component constituting part 58(3) is installed on the cylindrical part 26 for holding, and the heat-insulating component constituting parts 58(2) and 58(4) are clamped between the heat-insulating component constituting part 58(1) and the heat-insulating component constituting part 58(3). In this state, as long as the valve box constituting parts 14(1) and 14(2) are combined in a manner that encloses the heat-insulating component constituting parts 58(1), 58(2), 58(3), and 58(4), the installation of the entire heat-insulating component 58 on the seat ring 24, etc. becomes easy.

[0116] The heat-insulating component 58 can also be formed with gaps pre-set between the heat-insulating component constituting part 58(1) and 58(2), between the heat-insulating component constituting part 58(2) and 58(3), between the heat-insulating component constituting part 58(3) and 58(4), and between the heat-insulating component constituting part 58(4) and 58(1). In this case, the manufacturing precision of each heat-insulating component constituting part will not affect the installation operation of installing the heat-insulating component 58 on the seat ring 24. That is, when installing the heat-insulating component 58 on the seat ring 24, it is possible to prevent each heat-insulating component constituting part from being too large to combine each heat-insulating component constituting part with the seat ring 24.

[0117] (Clamping member 48)

[0118] The butterfly valve 12 includes a clamping member 48 clamped between the protruding part 18 of the valve box 14 and the connecting part 44 of the neck member 40. The clamping member 48 is formed of a resin having heat insulation properties. The clamping member 48 is formed of, for example, POM (polyoxymethylene), and can also be formed of a resin having heat insulation properties other than POM. The clamping member 48 includes a clamped part 66 clamped by the protruding part 18 and the connecting part 44 and a cylindrical part 68 into which the valve stem 32 is inserted and which is inserted into the hollow part 76 of the protruding part 18. The protruding part 18 and the connecting part 44 are fixed by bolts 78, so that the clamped part 66 of the clamping member 48 is clamped and fixed between the protruding part 18 and the connecting part 44.

[0119] (Auxiliary valve stem 36)

[0120] The butterfly valve 12 is provided with an auxiliary valve stem 36 which penetrates the seat ring 24 rotatably from the direction opposite to the valve stem 32, and the tip 80 in the penetration direction is fixed to the valve element 30. The auxiliary valve stem 36 is made of stainless steel, or may be made of a metal other than stainless steel. The auxiliary valve stem 36 is inserted into the hole 64 of the component 58(3) of the heat insulation member and is held rotatably by the inner peripheral wall and the bottom surface 74 of the hole 64.

[0121] (Valve structure 200, valve heat insulation structures 10 and 11)

[0122] The valve structure 200 constitutes the butterfly valve 12 and is composed of a valve box 14, a seat ring 24, a space portion 70, and a heat insulation member 58. The valve heat insulation structure 10 constitutes the butterfly valve 12 and is composed of a valve box 14, a seat ring 24, a space portion 70, and a heat insulation member 58. That is, the valve structure 200 constitutes the valve heat insulation structure 10. The valve heat insulation structure 11 constitutes the butterfly valve 12 and is composed of a valve box 14, a neck member 40, and a clamping member 48.

[0123] (Function and effect)

[0124] (Installation of the seat ring 24 and the valve box 14)

[0125] As described above, the component 58(1) of the heat insulation member is pre-installed and held on the cylindrical portion 26 of the seat ring 24, the component 58(3) of the heat insulation member is installed and held on the auxiliary valve stem 36, and the components 58(2) and 58(4) of the heat insulation member are respectively clamped between the component 58(1) and the component 58(3) of the heat insulation member. In this state, the heat insulation member 58 is installed on the seat ring 24. Then, the two valve box components 14(1) and 14(2) are stacked on the heat insulation member 58 and connected by bolts 20 and nuts 22. As a result, the cylindrical portion 26 of the seat ring 24 is disposed in a state of being sandwiched in the cylindrical portion 16 of the valve box 14. Therefore, there is no need to deform the seat ring 110 as shown in Figure 9 to press the seat ring 110 into the valve box 14 in order to dispose the cylindrical portion 26 of the seat ring 24 in the cylindrical portion 16 of the valve box 14. Thus, it is easy to assemble the seat ring 24 and the valve box 14, and the assembly of the butterfly valve 12 becomes easy. In addition, a robot can be used to insert the seat ring 24 into the valve box 14, and it can be developed towards automatic assembly.

[0126] In addition, by removing the bolts 20 and nuts 22 to separate the valve box components 58(1) and 58(2), the components 58(2), (3), and (4) of the heat insulation member can be removed from the seat ring 24, and it is easy to disassemble the valve 12, and the adjustment of the seal becomes easy.

[0127] Next, the assembly process of the valve box 14 will be described in chronological order. As the first stage, as shown in (a) of Figure 3 , while sliding the two valve box components 14(1) and 14(2) between the two outermost bulges 59 in the Y-axis direction in the heat insulation member 58 along the side walls of the two outermost bulges 59, the two valve box components 14(1) and 14(2) are brought closer to each other. After the two valve box components 14(1) and 14(2) are brought closer to each other, the two valve box components 14(1) and 14(2) are engaged with the clamping member 48.

[0128] As the second stage, as shown in (b) of Figure 3 , while bringing the inner peripheral surfaces 14I of the valve box components 14(1) and 14(2) into contact with and sliding along the outer peripheral surfaces 59S of the bulges 59 of the heat insulation member component 58(1), the two valve box components 14(1) and 14(2) are brought closer to each other. As the third stage, as shown in (c) of Figure 3 , while bringing the inner peripheral surfaces 14I of the two valve box components 14(1) and 14(2) into contact with and sliding along the outer peripheral surfaces 59S of the bulges 59 of the heat insulation member component 58(3), the valve box components 14(1) and 14(2) are brought closer to each other. As the fourth stage, the engaging protrusion 204 is engaged with the engaging recess 206, and the two valve box components 14(1) and 14(2) are brought into contact with and connected to each other. At this time, the arc shapes of the inner peripheral surfaces 14I of the valve box components 14(1) and 14(2) are in contact with the arc shapes of the outer peripheral surfaces 59S. As described above, the valve box components 14(1) and the valve box component 14(2) are assembled step by step. Therefore, there is no need to worry about aligning the positions of the components with each other, and the relative position adjustment operation can be omitted. In addition, as described above, near the upper end and the lower end of the seat ring 24, the bulges 59 or the engaging protrusions 204 of the heat insulation member 58 can be used as positioning guides, and the valve box components 14(1) and 14(2) are brought closer to each other and connected. Therefore, the assembly of the butterfly valve 12 can be facilitated.

[0129] Next, the heat insulation function and effect between the fluid flowing in the flow path 27 of the butterfly valve 12 of the present invention and the valve driving unit 46 will be described. In the case of the butterfly valve 12, the low-temperature fluid flows into the flow path 27, so that the low temperature of the fluid flowing in the flow path 27 is transferred to the cylindrical portion 26 of the seat ring 24 with a larger contact area of the fluid (heat moves from the cylindrical portion 26 on the high-temperature side to the low-temperature side fluid), and the low temperature is transferred to the outer peripheral surface of the cylindrical portion 26.

[0130] Here, there is a space portion 70 between the cylindrical portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24. The thermal conductivity of the air in the space portion 70 is low. Therefore, the low temperature on the outer peripheral surface of the cylindrical portion 26 is not easily transferred to the cylindrical portion 16 via the space portion 70 (heat is not easily transferred from the high-temperature cylindrical portion 16 to the low-temperature cylindrical portion 26). In addition, in the space portion 70, the cooler air moves downward along the gap between the outer peripheral surface of the cylindrical portion 26 and the heat insulating member 58, and the warmer air moves upward to the upper portion of the protruding portion 18 closer to the upper portion of the valve box 14. Therefore, when the valve driving portion 46 is located above the butterfly valve 12, the low temperature is not easily transferred to the protruding portion 18 and is not easily transferred to the neck member 40 close to the protruding portion 18 (there is a clamping member 48 between the protruding portion 18 and the neck member 40, and the functions and effects of the clamping member 48 will be described later). Thus, the low temperature is not easily transferred to the flange 42 of the neck member 40 and is not easily transferred to the valve driving portion 46 in contact with the flange 42. Moreover, in order to improve the heat insulation effect between the flange 42 and the valve driving portion 46, a space 43 with air having a low thermal conductivity is provided in the flange 42. Therefore, the low temperature is not transferred from the flange 42 to the valve driving portion 46 (heat is not transferred from the high-temperature valve driving portion 46 to the low-temperature flange 42). According to the present invention, by using the above-described action, heat insulation can be performed between the low-temperature fluid and the valve driving portion 46, and it is possible to prevent the valve driving portion 46 from becoming low temperature and causing dew condensation in the valve driving portion 46.

[0131] In addition, according to the present invention, heat insulation can be performed between the low-temperature fluid and the valve driving portion 46. Therefore, there is no need to form the butterfly valve from stainless steel having a low thermal conductivity in order to perform heat insulation between the low-temperature fluid and the valve driving portion 46. Therefore, the butterfly valve can be formed of aluminum or the like different from the expensive and heavy stainless steel. Therefore, the cost of the butterfly valve can be reduced and the manufacturing becomes easy.

[0132] In addition, a heat insulating member 58 is provided in the space portion 70 between the cylindrical portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24. Therefore, there are two layers, an air layer having a low thermal conductivity and a heat insulating member layer having a low thermal conductivity, in the space portion 70. Thus, the low temperature on the outer peripheral surface of the cylindrical portion 26 is even less likely to be transferred to the valve driving portion 46 via the valve box 14. In addition, due to the heat loss caused by heat transfer between different objects, the low temperature on the outer peripheral surface of the cylindrical portion 26 is even less likely to be transferred to the valve driving portion 46 via the valve box 14. Thus, the effect of significantly performing heat insulation between the low-temperature fluid in the flow path 27 and the valve driving portion 46 is produced.

[0133] In addition, according to the invention of the present application, a heat-insulating clamping member 48 is provided between the protruding portion 18 of the valve box 14 and the connecting portion 44 of the neck member 40. Therefore, it is more difficult for low temperature to be transferred from the protruding portion 18 to the connecting portion 44. In addition, due to the heat loss caused by heat transfer between different objects, it is more difficult for low temperature to be transferred from the protruding portion 18 to the connecting portion 44. Therefore, it is more difficult for the low temperature of the flow path 27 to be transferred to the valve driving portion 46 via the valve box 14 and the neck member 40, and the effect of insulating between the fluid at the low temperature of the flow path 27 and the valve driving portion 46 is more significantly produced. In addition, due to the synergistic effect of the space portion 70, the heat-insulating member 58, and the clamping member 48, the effect of insulating between the fluid at the low temperature of the flow path 27 and the valve driving portion 46 is further significantly produced.

[0134] In addition, the valve stem 32 has a hollow portion 55 in which air with a relatively low thermal conductivity exists. The valve stem 32 is long and has a small cross-sectional area. Therefore, the low temperature of the fluid in the flow path 27 hardly transfers from the valve element 30 to the valve driving portion 46 via the valve stem 32. In addition, the low temperature transferred to the auxiliary valve stem 36 via the valve element 30 is blocked by the vicinity of the hole 64 of the heat-insulating member component 58(3) and does not transfer to the valve box 14. The low temperature transferred from the valve element 30 to the auxiliary valve stem 36 does not transfer to the valve driving portion 46 via the valve box 14 or the like.

[0135] The above has described an embodiment of the invention of the present application, but the invention of the present application can also be other embodiments. For example, in the valve structure 200 in which the valve box 14 is composed of two valve box components 14(1) and (2), it can also be configured as Figure 4 shown, the outer peripheral surface 59S of the bulging portion 59 of the heat-insulating member 58 and the inner peripheral surfaces 14I of the valve box components 14(1) and (2) of the valve box 14 are in an arc shape in a cross section perpendicular to the rotation center C1 of the valve stem and are in contact with each other. In this case, when the valve box components 14(1) and (2) are installed on the heat-insulating member 58 and the seat ring 24, the inner peripheral surface 14I is brought into contact with the outer peripheral surface 59S, so that it is possible to prevent the valve box components 14(1) and (2) from being misaligned with respect to the heat-insulating member 58 and the seat ring 24 and improve the installation accuracy.

[0136] In addition, in Figure 4 the valve structure 200 shown, the valve seat portion 28 with which the outer peripheral surface 30S of the valve element 30 abuts may also be as Figure 4 and Figure 5 shown, have a concave curved surface 28CC on the valve element 30 side. In this case, the valve element 30 is configured to rotate clockwise around the rotation center C1 of the valve stem, the outer peripheral surface 30S abuts against the concave curved surface 28CC, and after the sealing amount SW of the outer peripheral surface 30S entering the concave curved surface 28CC gradually increases, it stops at Figure 4The shown sealing position. The sealing position refers to the position where the rotating valve element 30 completely stops due to the resistance from the valve seat projection 28CV. The sealing position is determined by the torque of the valve element 30, the elastic modulus of the seat ring 24, and the dimensions of the valve seat projection 28CV. In Figure 4 In the case of the valve seat portion 28 shown, the sealing amount SW in which the outer peripheral surface 30S enters the concave curved surface 28CC gradually increases. Due to the resistance from the concave curved surface 28CC, the rotational speed of the valve element 30 gradually decreases and stops at the sealing position in a sufficiently reduced state. Therefore, the valve element 30 can be reliably stopped at the sealing position.

[0137] An example of the method for forming the concave curved surface 28CC will be described below. Initially on the CAD screen, draw, for example, the rotation locus circle R1 of the outer peripheral surface of the valve element, and draw a plurality of pitch circles whose radii decrease with a constant pitch relative to the rotation locus circle R1. Additionally, draw the straight line ST0 passing through the rotation center C1 and the point where the outer peripheral surface contacts the concave curved surface at the sealing position, and draw a plurality of pitch lines passing through the rotation center C1 that are rotated counterclockwise relative to the straight line ST0 at a constant angular pitch. Then, select predetermined intersection points from the intersection points of the rotation locus circle R1 and the pitch circles with the straight line ST0 and the pitch lines that can form the concave curved surface. Draw a spline curve passing through the selected intersection points, and this spline curve becomes the concave curved surface 28CC.

[0138] According to Figure 5 , an example of the method for forming the concave curved surface 28CC will be specifically described below. Let the radius of the rotation locus circle R1 centered on the rotation center C1 of the valve element 30 be r1. First, draw the rotation locus circle R1. Then, draw a plurality of circles whose radii decrease with a pitch of d mm (for example, 1 mm) relative to the rotation locus circle R1. That is, draw the pitch circle R2 with a radius of r1 - d mm, the pitch circle R3 with a radius of r1 - 2·d mm, the pitch circle R4 with a radius of r1 - 3·d mm, the pitch circle R5 with a radius of r1 - 4·d mm, and the pitch circle R0 with a radius of r1 - 5·d mm. The order of drawing each circle is not limited.

[0139] When the valve element 30 is in the sealing position, let θ (the rotation angle of the valve element 30) = 0°. Draw the straight line ST0 passing through the rotation center C1 and the point P0 where the outer peripheral surface 30S contacts the concave curved surface 28CC at the sealing position. Then, draw a plurality of pitch lines passing through the rotation center C1 that are rotated counterclockwise relative to ST0 at a pitch of angle θ1 (for example, 3°). That is, draw the straight line ST0 passing through C1 when θ = 0, the pitch line ST5 when θ = -θ1, the pitch line ST4 when θ = -2·θ1, the pitch line ST3 when θ = -3·θ1, the pitch line ST2 when θ = -4·θ1, and the pitch line ST1 when θ = -5·θ1. The order of drawing each line is not limited.

[0140] The intersection points P5 of the plot ST1 and the rotation locus circle R1, P4 of ST2 and R2, P3 of ST3 and R3, P2 of ST4 and R4, P1 of ST5 and R5, and P0 of ST0 and R0 are marked. Next, a spline curve passing through these intersection points P5, etc. is drawn. This spline curve becomes the concave surface 28CC. P5 is the point where the outer peripheral surface 30S of the valve element 30 starts to contact the concave surface 28CC of the seat ring 24. At P5, the seal amount SW0 = 0 mm, at P4, the seal amount SW4 = 1·d mm, at P3, the seal amount SW3 = 2·d mm, at P2, the seal amount SW2 = 3·d mm, at P1, the seal amount SW1 = 4·d mm, and at P0, the seal amount SW0 = 5·d mm. The above describes an example of the method for forming the concave surface 28CC, but the method for forming the concave surface 28CC is not limited.

[0141] In addition, in the valve structure 200 of the present invention, it can also be configured as Figure 6 shown in (a) of the figure, the outer peripheral surface 24S of the seat ring 24 and the inner peripheral surface 14I of the valve box 14 are arc-shaped in a cross-section perpendicular to the rotation center of the valve stem and are in contact with each other. In this case, it is configured such that the arc shape of the outer peripheral surface 24S and the arc shape of the inner peripheral surface 14I coincide with the rotation locus 30T of the valve element 30. In addition, since the cross-sectional shapes of the outer peripheral surface 24S and the inner peripheral surface 14I are arc-shaped, the outer peripheral surface 24S and the inner peripheral surface 14I are spherically fitted three-dimensionally. An adiabatic member that is spherically fitted to the outer peripheral surface 24S and the inner peripheral surface 14I can also be interposed between the outer peripheral surface 24S and the inner peripheral surface 14I. In addition, since the valve box 14 is segmented, the spherical shape of the inner peripheral surface 14I can be easily formed at low cost. Figure 6 (c) of the figure shows a conventional valve structure 122.

[0142] Figure 6 If there is an assembly deviation in the conventional valve structure 122 shown in (c) of the figure, as Figure 6 shown in (d) of the figure, a gap GP is generated between the valve seat portion 114 of the seat ring 110 and the rotation locus 108T of the valve element 108. Therefore, in order to fill the gap GP, the valve seat portion 114 needs to be formed larger. In contrast, for the valve structure 200 of the present invention, when there is an assembly deviation, as Figure 6 shown in (b) of the figure, the valve seat portion 28 moves along the rotation locus 30T of the valve element 30, so no gap is generated and the deviation can be absorbed. Therefore, the seal amount can be reduced and the operating torque for closing the valve element 30 can be decreased. In addition, the outer peripheral surface 24S and the inner peripheral surface 14I are spherically fitted, and the valve seat portion 28 moves three-dimensionally along the rotation locus 30T of the valve element 30.

[0143] In addition, as shown in (a) of Figure 7 , a concave curved surface 28CS may also be provided on half of the sealing portion 28 of the valve structure 200 of the invention of the present application. In Figure 7 (a) and Figure 7 (b), the dash-dotted line indicates the shut-off position of the valve element. Compared with the conventional valve structure 122 shown in (b) of Figure 7 , the valve structure 200 can reduce the area where the valve element compresses the sealing portion. Therefore, the operating torque for closing the valve element can be reduced.

[0144] The embodiments of the invention of the present application have been described above, but the invention of the present application is not limited to the above embodiments and can be implemented with appropriate design changes. For example, it is not limited to the case where the valve box is composed of two valve box components, and it may also be composed of three or more valve box components. The valve of the invention of the present application is not limited to a butterfly valve, as long as it is a valve using cryogenic fluid, the type of the valve is not limited. In addition, the butterfly valve of the invention of the present application includes single-eccentric, double-eccentric, and triple-eccentric butterfly valves.

[0145] Explanation of Reference Numerals

[0146] 200, valve structure; 10, 11, valve heat insulation structure; 12, butterfly valve (valve); 14, valve box; 14(1), 14(2), valve box components; 14I, inner peripheral surface; 16, cylindrical portion; 18, protruding portion (connecting portion); 24, seat ring; 25, bulging portion; 26, cylindrical portion; 26I, inner surface; 27, flow path; 28, valve seat portion; 28CC, concave curved surface; 28CV, valve seat convex portion; 30, valve element; 30S, outer peripheral surface; 32, valve stem; 36, auxiliary valve stem; 40, neck member; 42, flange (fixing portion); 43, space; 44, connecting portion; 46, valve drive portion; 48, clamping member; 55, hollow portion; 56, rotating shaft; 57, contact plate; 58, heat insulation member; 58(1), 58(2), 58(3), 58(4), heat insulation member components; 59, bulging portion (rib); 59S, outer peripheral surface; 61, heat sink; 66, clamped portion; 68, cylindrical portion; 70, space portion; 74, bottom surface; 204, engaging protrusion; 206, engaging recess; C1, rotation center; P0, point where the outer peripheral surface 30S contacts the concave curved surface 28CC at the sealing position; P5, point where the outer peripheral surface 30S of the valve element 30 starts to contact the concave curved surface 28CC of the seat ring 24.

Claims

1. A valve structure, which is a valve structure constituting a valve, and the valve includes: A valve box having a cylindrical portion and a connecting portion continuous with the cylindrical portion; A seat ring having a cylindrical portion disposed within the cylindrical portion of the valve box; A valve element disposed within the cylindrical portion of the seat ring; A neck member having: a fixing portion fixed to a valve driving portion; and a connecting portion directly or indirectly connected to the connecting portion of the valve box; and A valve stem rotatably passing through the neck member, the connecting portion of the valve box, and the seat ring, and having a top end in the passing direction fixed to the valve element, wherein This valve structure is configured to include: The valve box; The seat ring; An annular space portion provided at an interval between the inner peripheral surface of the cylindrical portion of the valve box and the outer peripheral surface of the seat ring; and An annular heat insulating member disposed within the space portion and sandwiched between the inner peripheral surface of the cylindrical portion of the valve box and the outer peripheral surface of the seat ring, The valve box is composed of a plurality of valve box component parts, By connecting the plurality of valve box component parts, the cylindrical portion of the seat ring is disposed within the cylindrical portion of the valve box, This valve structure is configured such that the outer peripheral surface of the heat insulating member and the inner peripheral surface of the cylindrical portion of the valve box are in an arc shape in a cross section perpendicular to the rotation axis of the valve stem and are in contact with each other, The heat insulating member is divided into a plurality of heat insulating member component parts, A gap is formed between each of the heat insulating member component parts.

2. The valve structure according to claim 1, wherein The plurality of valve box component parts are arranged in contact with the outer peripheral surface of the heat insulating member.

3. The valve structure according to claim 1 or 2, wherein A latching protrusion is provided at the connecting portion of one valve box component part, and a latching recess engaged with the latching protrusion is provided at the connecting portion of another valve box component part.

4. The valve structure according to claim 3, wherein The seat ring has a valve seat portion for abutting against the outer peripheral surface of the valve element, The valve seat portion has a concave curved surface on the valve element side, The valve element is configured to rotate about the rotation center of the valve stem, the outer peripheral surface abuts against the concave curved surface, and stops after the sealing amount of the outer peripheral surface entering the concave curved surface gradually increases.

5. The valve structure according to claim 1 or 2, wherein The seat ring has a valve seat portion for abutting against the outer peripheral surface of the valve element, The valve seat portion has a concave curved surface on the valve element side, The valve element is configured to rotate about the rotation center of the valve stem, the outer peripheral surface abuts against the concave curved surface, and stops after the sealing amount of the outer peripheral surface entering the concave curved surface gradually increases.

6. A valve, which includes: A valve box having a cylindrical portion and a connecting portion continuous with the cylindrical portion; A seat ring having a cylindrical portion disposed within the cylindrical portion of the valve box; A valve element disposed within the cylindrical portion of the seat ring; A neck member having: a fixing portion fixed to a valve driving portion; and a connecting portion directly or indirectly connected to the connecting portion of the valve box; and A valve stem that penetrates the neck member, the connecting portion of the valve box, and the seat ring in a rotatable manner, and the top end in the penetration direction is fixed to the valve element, wherein, The valve has the valve structure according to any one of claims 1 to 5.

7. An assembling method of a valve structure, which is the assembling method of the valve structure according to claim 3, wherein, The assembling method includes: A step in which two valve box component parts approach each other while sliding along the heat insulating member; A step in which the engaging projection of one valve box component part engages with the engaging recess of the other valve box component part; and A step in which two valve box component parts abut against each other.

Images