Flow passage member

Abstract

To provide a flow passage member capable of forming an internal flow passage over a plurality of laminates without using any seal member.SOLUTION: A bulb device 30 comprises: a plurality of bulbs 60; a case 80 welded to the plurality of bulbs 60 stacked on the plurality of bulbs 60; and a top cover 140 to be welded to the case 80 to be stacked on the case 80. The case 80 has: a bottom part 111 transmitting laser light and welded to the plurality of bulbs 60; and a side part 120 absorbing the laser light and welded to the top cover 140. The plurality of bulbs 60 have parts welded to the bottom part 111 of the case 80 are configured to absorb the laser light. A part of the top cover 140 welded to the side part 120 of the case 80 is configured to transmit the laser light.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present invention relates to a flow path member.

Background Art

[0002] Patent Document 1 describes, as an example of a flow path member, a valve assembly disposed between a pump that is a source of air supply and an air bag that is an object of air supply. The valve assembly is provided with an internal flow path through which air flows. And, the valve assembly can adjust the air supply mode from the pump to the air bag by opening and closing the internal flow path.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the valve assembly as described above, the internal flow path is constituted by laminating a plurality of laminates having partial flow paths. For this reason, the valve assembly requires a seal member for preventing air leakage at a portion between two laminated laminates where the partial flow paths of the two laminates are connected.

Means for Solving the Problems

[0005] The flow path member for solving the above problems is a flow path member provided with an internal flow path, and includes a first laminate, a second laminate welded to the first laminate in a state of being laminated on the first laminate, and a third laminate welded to the second laminate in a state of being laminated on the second laminate. The internal flow path is provided across the first laminate, the second laminate, and the third laminate. The second laminate has a transmission part that transmits laser light, the transmission part being welded to the first laminate, and an absorption part that absorbs laser light, the absorption part being welded to the third laminate. In the first laminate, at least a part welded to the transmission part of the second laminate is configured to absorb laser light. In the third laminate, at least a part welded to the absorption part of the second laminate is configured to transmit laser light.

Advantages of the Invention

[0006] The flow path member can form an internal flow path across a plurality of laminates without using a seal member.

Brief Description of the Drawings

[0007]

Figure 1

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Figure 11

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Figure 15

DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment in which the flow path member is embodied in a valve device will be described. <Configuration of this Embodiment> As shown in FIG. 1, the seat 10 includes a seat cushion 11, a seat back 12, and a pneumatic system 20. The seat 10 corresponds to, for example, a driver's seat, a passenger seat, and a rear seat of a vehicle. The seat 10 may also be a massage seat used at home and in facilities.

[0009] <Seat Cushion 11 and Seat Back 12> As shown in FIG. 1, the seat cushion 11 supports the user's buttocks and thighs. The seat back 12 supports the user's back. Although not shown, the seat cushion 11 includes a seat frame that constitutes the skeleton, a cushion spring supported by the seat frame, a cushion pad attached to the cushion spring, and a skin that covers the cushion pad. The same applies to the seat back 12.

[0010] <Pneumatic System 20> As shown in FIGS. 1 and 2, the pneumatic system 20 includes a pump 21, a plurality of air bags 22, an air supply tube 23, a plurality of connection tubes 24, an operation unit 25, a control device 26, and a valve device 30. In the following description, upstream and downstream are referred to according to the direction of air flow.

[0011] <Pump 21> The pump 21 may be an electric pump having an electric motor as a drive source. The pump 21 drives the electric motor based on electric power supplied from a battery or the like. The pump 21 is a supply source of air to the valve device 30. The upstream end of the air supply tube 23 is connected to the pump 21.

[0012] <Air bag 22> As shown in FIG. 1, the plurality of air bags 22 are arranged on the seat cushion 11 and the seat back 12. In the present embodiment, the total number of air bags 22 is "9". The air bag 22 expands when air is supplied and contracts when air is discharged. The air bag 22 massages the user's thigh, hip, and back by repeating expansion and contraction. As shown in FIG. 2, the downstream ends of the plurality of connection tubes 24 are respectively connected to the plurality of air bags 22. In FIG. 2, the "..." next to the two-dot chain line rectangular frame indicates that there are a plurality of configurations within the two-dot chain line rectangular frame. Note that the shape and number of the air bags 22 can be changed as appropriate.

[0013] <Valve device 30> As shown in FIG. 3, the valve device 30 has a rectangular parallelepiped shape. In the following description, the short side direction in the plan view of the valve device 30 is defined as the first direction D1, the long side direction in the same plan view is defined as the second direction D2, and the direction orthogonal to both the first direction D1 and the second direction D2 is defined as the vertical direction D3. The first direction D1, the second direction D2, and the vertical direction D3 are orthogonal to each other. The vertical direction D3 is also the thickness direction of the valve device 30. Note that the vertical direction D3 indicates the up and down of the valve device 30 and does not necessarily coincide with the up and down direction of the seat 10.

[0014] As shown in FIGS. 3 and 4, the valve device 30 includes a base cover 40, a substrate 50, a plurality of valves 60, a case 80, a plurality of sound absorbing materials 130, and a top cover 140. In the present embodiment, the plurality of valves 60 correspond to the "first laminate", the case 80 corresponds to the "second laminate", and the top cover 140 corresponds to the "third laminate".

[0015] <Base cover 40> As shown in FIG. 4, the base cover 40 has a bottom wall 41 and four side walls 42. The bottom wall 41 has a rectangular plate shape with the vertical direction D3 as the plate thickness direction. The longitudinal direction of the bottom wall 41 is the second direction D2, and the short side direction of the bottom wall 41 is the first direction D1. The four side walls 42 have a rectangular plate shape with the direction orthogonal to the vertical direction D3 as the plate thickness direction. The four side walls 42 extend upward from the corners of the bottom wall 41.

[0016] <Substrate 50> As shown in FIG. 4, the substrate 50 has a rectangular plate shape with the vertical direction D3 as the plate thickness direction. The substrate 50 is slightly smaller than the bottom wall 41 of the base cover 40. The substrate 50 has a plurality of fixing holes 51 penetrating in the plate thickness direction. The substrate 50 also has a connector 52. The connector 52 is a portion to which the end of a harness that combines signal lines for transmitting and receiving signals for controlling the valve device 30 and power supply lines for supplying power to the valve device 30 is connected. A plurality of valves 60 and electronic components (not shown) are mounted on the substrate 50.

[0017] <Valve 60> As shown in FIGS. 2 and 5, the plurality of valves 60 are solenoid valves. As shown in FIG. 5, the valve 60 includes a base 70, a coil 61, a yoke 62, a plunger 63, a valve body 64, a cap 65, a seal ring 66, a coil spring 67, and two terminals 68. In the present embodiment, the total number of valves 60 is equal to the total number of airbags 22.

[0018] The base 70 is made of a light-absorbing thermoplastic resin. The light-absorbing thermoplastic resin is a resin material with a high absorption rate for the wavelength of the laser light used for laser welding. The light-absorbing thermoplastic resin may contain reinforcing materials such as glass fibers and carbon fibers, or may contain coloring materials. The base 70 has a bobbin 71 and a connection part 72. Further, the base 70 has an internal space 73, an upstream connection flow path 74, and a downstream connection flow path 75.

[0019] The bobbin 71 has a cylindrical shape. A winding constituting the coil 61 is wound around the bobbin 71. The connection part 72 is connected to the bobbin 71 in the axial direction of the bobbin 71. The internal space 73 is a columnar space provided across the inside of the bobbin 71 and the inside of the connection part 72. The axial direction of the internal space 73 coincides with the axial direction of the bobbin 71.

[0020] The main surface 72a, which is the uppermost surface of the connection part 72, is a plane intersecting the axial direction of the bobbin 71. The connection part 72 has two annular ribs 72b, 72c. The upstream connection flow path 74 and the downstream connection flow path 75 are provided in the connection part 72. The upstream end of the upstream connection flow path 74 and the downstream end of the downstream connection flow path 75 open to the main surface 72a of the connection part 72. On the other hand, the downstream end of the upstream connection flow path 74 and the upstream end of the downstream connection flow path 75 open toward the internal space 73. The upstream connection flow path 74 and the downstream connection flow path 75 constitute part of the "internal flow path" of the valve device 30 and correspond to the "first flow path".

[0021] The two annular ribs 72b, 72c project from the main surface 72a in a direction orthogonal to the main surface 72a. The first annular rib 72b surrounds the periphery of the upstream opening of the upstream connection flow path 74, and the second annular rib 72c surrounds the periphery of the downstream opening of the downstream connection flow path 75. When viewed from the vertical direction D3, the first annular rib 72b is slightly larger than the upstream connection flow path 74. Similarly, the second annular rib 72c is slightly larger than the downstream connection flow path 75. In the present embodiment, the annular ribs 72b, 72c are annular and rectangular.

[0022] The yoke 62 is made of a magnetic material. The yoke 62 forms a magnetic circuit together with the electromagnet. The plunger 63 is made of a magnetic material. The plunger 63 has a cylindrical shape. The outer diameter of the plunger 63 is smaller than the inner diameter of the inner space 73 of the base 70. Valve bodies 64 are arranged at both axial ends of the plunger 63. The plunger 63 is accommodated in the inner space 73 of the base 70. At this time, the valve body 64 faces the downstream opening of the upstream connection flow path 74 in the axial direction of the inner space 73 and also faces the upstream opening of the atmosphere communication path 65a of the cap 65 described later. Further, the plunger 63 can move axially together with the valve body 64 within the inner space 73.

[0023] The cap 65 has a cylindrical shape. The cap 65 has an atmosphere communication path 65a penetrating in the axial direction. The cap 65 is inserted into the inner space 73 of the base 70. At this time, the upstream end of the atmosphere communication path 65a opens toward the inner space 73 of the base 70, and the downstream end of the atmosphere communication path 65a opens to the atmosphere. Unlike the plunger 63, the cap 65 is fixedly immovable with respect to the base 70. A seal ring 66 is arranged between the base 70 and the cap 65. The seal ring 66 prevents air from leaking from the inner space 73 through the gap between the base 70 and the cap 65.

[0024] The coil spring 67 is accommodated in the inner space 73 of the base 70. The coil spring 67 is compressed between the plunger 63 and the cap 65 in the inner space 73 of the base 70. For this reason, the coil spring 67 biases the plunger 63 toward the connecting portion 72. The two terminals 68 are respectively connected to both ends of the winding constituting the coil 61. When the valve 60 is mounted on the substrate 50, the two terminals 68 are electrically connected to the substrate 50.

[0025] As shown in FIGS. 2 and 5, when the valve 60 is not powered, the plunger 63 is pressed against the connection portion 72 together with the valve body 64 by the biasing force of the coil spring 67. That is, the valve body 64 closes the opening of the upstream connection flow path 74 while not closing the opening of the atmosphere communication path 65a. For this reason, when the valve 60 is not powered, the valve 60 is in an exhaust state in which the downstream connection flow path 75 and the atmosphere communication path 65a are connected without connecting the upstream connection flow path 74 and the downstream connection flow path 75. At this time, the downstream connection flow path 75 and the atmosphere communication path 65a are connected through the gap between the base 70 and the plunger 63. On the other hand, when the valve 60 is powered, the plunger 63 moves in a direction away from the connection portion 72 together with the valve body 64. That is, the valve body 64 does not close the opening of the upstream connection flow path 74 while closing the opening of the atmosphere communication path 65a. For this reason, when the valve 60 is powered, the valve 60 is in an air supply state in which the upstream connection flow path 74 and the downstream connection flow path 75 are connected without connecting the downstream connection flow path 75 and the atmosphere communication path 65a. In this way, the valve 60 opens and closes the "first flow path" of the valve device 30.

[0026] <Case 80> As shown in FIGS. 4, 6, and 7, the case 80 includes an upper wall 90, two first side walls 81 and 82, two second side walls 83 and 84, a plurality of nozzles 85, 86, and 87, and a plurality of support columns 88.

[0027] The upper wall 90 has a rectangular plate shape with the vertical direction D3 as the plate thickness direction. The longitudinal direction of the upper wall 90 is the second direction D2, and the short side direction of the upper wall 90 is the first direction D1. The upper wall 90 has a flow path forming portion 100 that forms a part of the "internal flow path" of the valve device 30 together with the top cover 140.

[0028] As shown in FIGS. 6 to 8, the flow path forming portion 100 has a bottom portion 110 and side portions 120. The flow path forming portion 100 also has a plurality of exposed holes 101, a plurality of upstream connection holes 102, a plurality of downstream connection holes 103, a main groove 104, a plurality of sub grooves 105, a plurality of first air supply grooves 106, and a plurality of second air supply grooves 107.

[0029] The bottom 110 includes a first bottom 111, a second bottom 112, a plurality of third bottoms 113, and a fourth bottom 114. The plate thickness directions of the first bottom 111, the second bottom 112, the third bottoms 113, and the fourth bottom 114 are all in the vertical direction D3.

[0030] As shown in FIG. 7, the first bottom 111 has a rectangular plate shape. The longitudinal direction of the first bottom 111 is the second direction D2, and the short side direction of the first bottom 111 is the first direction D1. Although not shown, one end of the first bottom 111 in the second direction D2 is connected to the second side wall 84. As shown in FIGS. 6 and 7, the portion of the case 80 excluding the first bottom 111 is made of the above-described light-absorbing thermoplastic resin. In contrast, the first bottom 111 is made of a light-transmissive thermoplastic resin. The light-transmissive thermoplastic resin is a resin material having a high transmittance with respect to the wavelength of the laser light used for laser welding. In other words, the light-absorbing thermoplastic resin has a higher absorption rate than the light-transmissive thermoplastic resin, and the light-transmissive thermoplastic resin has a higher transmittance than the light-absorbing thermoplastic resin. Further, the light-transmissive thermoplastic resin may contain a reinforcing material such as glass fiber and carbon fiber, or may contain a coloring material such as carbon black.

[0031] In this regard, the portion of the case 80 excluding the first bottom 111 corresponds to the "absorbing portion", and the first bottom 111 corresponds to the "transmitting portion". Thus, as a method of forming the case 80 from two types of resin materials, there is two-color molding. In this regard, although the case 80 is an integral part, in the drawings, for ease of understanding, the line types of the hatching between the first bottom 111 and the portion excluding the first bottom 111 are changed. It should be noted that the type of laser light used for laser welding, the light-absorbing thermoplastic resin, and the light-transmissive thermoplastic resin are preferably selected as appropriate.

[0032] As shown in FIGS. 7 and 8, the second bottom 112 connects the first side wall 81 and the first bottom 111 in the first direction D1. The second bottom 112 is curved upward as it moves away from the first side wall 81 in the first direction D1. The plurality of third bottoms 113 are in the shape of rectangular plates. The plurality of third bottoms 113 are arranged side by side at intervals in the second direction D2. The plurality of third bottoms 113 extend from the first bottom 111 toward the first side wall 81 in the first direction D1. The fourth bottom 114 is in the shape of a rectangular plate. The fourth bottom 114 extends from the first side wall 81 in the first direction D1.

[0033] As shown in FIGS. 6 to 8, the side portion 120 extends upward from the bottom portion 110. The thickness direction of the side portion 120 is a direction perpendicular to the vertical direction D3. The side portion 120 is made of a light-absorbing thermoplastic resin in that it is a portion of the case 80 excluding the first bottom 111. As shown in FIG. 7, the plate thickness T2 of the side portion 120 is thicker than the plate thickness T1 of the first bottom 111. As shown in FIGS. 6 and 8, the front end surface 120a, which is the uppermost surface of the side portion 120, is perpendicular to the vertical direction D3. The side portion 120 has a linear rib 120b that extends upward from the front end surface 120a. The linear rib 120b extends upward from the front end surface 120a of the side portion 120. The width of the linear rib 120b is less than the plate thickness T2 of the side portion 120.

[0034] As shown in FIG. 8, the plurality of exposed holes 101 are defined by the first bottom 111, the plurality of third bottoms 113, and the side portion 120 extending from the fourth bottom 114. When viewed from the vertical direction D3, the exposed holes 101 are rectangular. The exposed holes 101 may have a shape corresponding to the valve 60. The plurality of exposed holes 101 are arranged side by side at intervals in the second direction D2. In other words, the plurality of exposed holes 101 are arranged alternately with the third bottoms 113 in the second direction D2.

[0035] The plurality of upstream communication holes 102 and the plurality of downstream communication holes 103 penetrate the first bottom 111 in the plate thickness direction. The cross-sectional shapes of the plurality of upstream communication holes 102 and the plurality of downstream communication holes 103 are rectangular. The cross-sectional shape of the upstream communication hole 102 is the same as the shape of the upstream opening of the upstream connection flow path 74 of the valve 60, and the cross-sectional shape of the downstream communication hole 103 is the same as the shape of the downstream opening of the downstream connection flow path 75 of the valve 60. The plurality of upstream communication holes 102 are aligned in the first direction D1 and the second direction D2, and the plurality of downstream communication holes 103 are aligned in the first direction D1 and the second direction D2. The number of the plurality of upstream communication holes 102 is equal to the total number of the valves 60, and the number of the plurality of downstream communication holes 103 is equal to the total number of the valves 60. In this regard, five upstream communication holes 102 and four upstream communication holes 102 are arranged in the second direction D2 with an interval in the first direction D1. Similarly, five downstream communication holes 103 and four downstream communication holes 103 are arranged in the second direction D2 with an interval in the first direction D1.

[0036] The main groove 104 is defined by the first bottom 111, the second bottom 112, and the side portion 120. When viewed from the vertical direction D3, the main groove 104 is L-shaped. That is, when viewed from the vertical direction D3, the main groove 104 has a portion extending in the first direction D1 and a portion extending in the second direction D2. The plurality of sub-grooves 105 branch from the portion of the main groove 104 extending in the second direction D2. The plurality of sub-grooves 105 are arranged at intervals in the second direction D2. When viewed from the vertical direction D3, the sub-groove 105 extends from the main groove 104 toward the fourth bottom 114 and then extends toward the second bottom 112. The portion of the main groove 104 extending in the second direction D2 is connected to the plurality of upstream communication holes 102. The plurality of sub-grooves 105 are respectively connected to the plurality of upstream communication holes 102 that are not connected to the main groove 104. Specifically, the portion of the main groove 104 extending in the second direction D2 is connected to five upstream communication holes 102. The plurality of sub-grooves 105 are respectively connected to four upstream communication holes 102 that are not connected to the main groove 104.

[0037] The plurality of first air supply grooves 106 and the plurality of second air supply grooves 107 are partitioned by the first bottom 111, the third bottom 113, the fourth bottom 114, and the side portion 120. The plurality of first air supply grooves 106 and the plurality of second air supply grooves 107 mainly have the first direction D1 as the longitudinal direction. In the first direction D1, the upstream ends of the plurality of first air supply grooves 106 are located near the main groove 104, and the downstream ends of the plurality of first air supply grooves 106 are located near the first side wall 81. Similarly, in the first direction D1, the upstream ends of the plurality of second air supply grooves 107 are respectively located near the plurality of sub-grooves 105, and the downstream ends of the plurality of second air supply grooves 107 are located near the first side wall 81. The plurality of first air supply grooves 106 and the plurality of second air supply grooves 107 are respectively connected to the plurality of downstream side communication holes 103.

[0038] <The first side walls 81, 82 and the second side walls 83, 84> As shown in FIGS. 4, 6, and 7, the first side walls 81, 82 are in the shape of rectangular plates with the first direction D1 as the plate thickness direction. The first side walls 81, 82 extend downward from both ends of the upper wall 90 in the first direction D1. As shown in FIGS. 6, 7, and 8, the first side wall 81 has a plurality of connection holes 81a, 81b, 81c and an opening 81d for exposing the connector 52. The plurality of connection holes 81a, 81b, 81c penetrate the first side wall 81 in the plate thickness direction. The connection hole 81a is connected to the main groove 104. The plurality of connection holes 81b are respectively connected to the plurality of first air supply grooves 106, and the plurality of connection holes 81c are respectively connected to the plurality of second air supply grooves 107. As shown in FIGS. 4, 6, and 7, the second side walls 83, 84 are in the shape of rectangular plates with the second direction D2 as the plate thickness direction. The second side walls 83, 84 extend downward from both ends of the upper wall 90 in the second direction D2.

[0039] <Nozzles 85, 86, 87> As shown in FIGS. 6 and 8, the plurality of nozzles 85, 86, 87 include an air supply nozzle 85, a plurality of first connection nozzles 86, and a plurality of second connection nozzles 87. The plurality of nozzles 85, 86, 87 are cylindrical. The plurality of nozzles 85, 86, 87 extend in the first direction D1 from the outer surface of the first side wall 81. The air supply nozzle 85 is connected to the main groove 104 through the connection hole 81a. The plurality of first connection nozzles 86 are respectively connected to the plurality of first air supply grooves 106 through the plurality of connection holes 81b. The plurality of second connection nozzles 87 are respectively connected to the plurality of second air supply grooves 107 through the plurality of connection holes 81c. The air supply nozzle 85 corresponds to the "inflow part", and the first connection nozzle 86 and the second connection nozzle 87 correspond to the "outflow part".

[0040] <Support column 88> As shown in FIG. 7, the plurality of support columns 88 are cylindrical. The plurality of support columns 88 extend downward from the upper wall 90. The plurality of support columns 88 are spaced apart in the first direction D1 and the second direction D2. The outer diameter of the support column 88 is slightly larger than the inner diameter of the fixing hole 51 of the substrate 50.

[0041] <Sound-absorbing material 130> As shown in FIG. 5, the sound-absorbing material 130 is rectangular parallelepiped-shaped. The sound-absorbing material 130 is composed of a porous material such as urethane sponge.

[0042] <Top cover 140> As shown in FIG. 3, the top cover 140 is in the shape of a rectangular plate with the vertical direction D3 as the plate thickness direction. The longitudinal direction of the top cover 140 is the second direction D2, and the short side direction of the top cover 140 is the first direction D1. When viewed from the vertical direction D3, the shape of the top cover 140 is equivalent to the shape of the flow path component 100 of the case 80. The top cover 140 is composed of the above-mentioned light-transmissive thermoplastic resin. However, the material of the top cover 140 does not have to be the same as the material of the first bottom 111 of the case 80.

[0043] <Engagement relationship of components of the valve device 30> As shown in FIG. 4, a plurality of valves 60 are mounted on the substrate 50 such that the axial direction of the coil 61 is the first direction D1. Specifically, on the substrate 50, the plurality of valves 60 are arranged in the first direction D1 and the second direction D2. In the present embodiment, five valves 60A are arranged in the second direction D2, and four valves 60 are arranged in the second direction D2. Further, the five valves 60 and the four valves 60 are densely arranged in the first direction D1. Two valves 60 arranged in the first direction D1 face in opposite directions. In this regard, the connection portions 72 of the two valves 60 arranged in the first direction D1 face the first direction D1. Also, the two terminals 68 of the plurality of valves 60 are electrically connected to the substrate 50. In the following description, among the plurality of valves 60 arranged in the second direction D2, the valves 60 constituting one row are also referred to as valves 60A, and the valves 60 constituting the other row are also referred to as valves 60B. In the present embodiment, the total number of valves 60A is "5", and the total number of valves 60B is "4".

[0044] As shown in FIGS. 4 and 9, the case 80 is laminated on the substrate 50 on which the plurality of valves 60 are arranged from above. At this time, the axes of the plurality of support columns 88 of the case 80 coincide with the axes of the plurality of fixing holes 51 of the substrate 50. The substrate 50 is fixed to the case 80 via fastening members such as screws and bolts. Specifically, the substrate 50 is fixed to the case 80 by fastening members passing through the plurality of fixing holes 51 of the substrate 50 to the plurality of support columns 88 of the case 80.

[0045] As shown in FIGS. 9 and 10, the connection portion 72 of the valve 60 is welded to the case 80. Specifically, as shown in FIG. 11, the first annular rib 72b of the connection portion 72 of the valve 60 and the first bottom portion 111 of the case 80 are welded together. Although not shown, the second annular rib 72c of the connection portion 72 of the valve 60 and the first bottom portion 111 of the case 80 are welded together. Thus, the plurality of valves 60 are fixed to the case 80. Here, the annular ribs 72b and 72c of the connection portion 72 of the valve 60 and the side portion 120 of the case 80 are displaced in a direction orthogonal to the vertical direction D3. That is, when the valve device 30 is viewed from the vertical direction D3, the annular ribs 72b and 72c of the connection portion 72 of the valve 60 are displaced with respect to the side portion 120 of the case 80. In this regard, when viewed from the stacking direction, it can be said that the portion welded to the "transmission portion of the second laminate" in the "first laminate" is displaced with respect to the "absorbing portion of the second laminate".

[0046] As shown in FIG. 9, the upstream communication hole 102 connected to the main groove 104 of the case 80 is connected to the valve 60A located near the first side wall 82. Specifically, as shown in FIG. 11, the upstream communication hole 102 connected to the main groove 104 of the case 80 is connected to the upstream connection flow path 74 of the valve 60A through the space inside the first annular rib 72b of the valve 60A. Similarly, as shown in FIG. 9, the upstream communication hole 102 connected to the sub groove 105 of the case 80 is connected to the valve 60B located near the first side wall 81. Specifically, as shown in FIG. 11, the upstream communication hole 102 connected to the sub groove 105 of the case 80 is connected to the upstream connection flow path 74 of the valve 60B through the space inside the first annular rib 72b of the valve 60B.

[0047] As shown in FIG. 10, the downstream communication hole 103 connected to the first air supply groove 106 of the case 80 is connected to the valve 60A located near the first side wall 82. Specifically, the downstream communication hole 103 connected to the first air supply groove 106 of the case 80 is connected to the downstream connection flow path 75 of the valve 60A through the space inside the second annular rib 72c of the valve 60B. Similarly, the downstream communication hole 103 connected to the second air supply groove 107 of the case 80 is connected to the valve 60B located near the first side wall 81. Specifically, the downstream communication hole 103 connected to the second air supply groove 107 of the case 80 is connected to the downstream connection flow path 75 of the valve 60B through the space inside the second annular rib 72c of the valve 60B.

[0048] As shown in FIGS. 3, 9, and 10, the top cover 140 is laminated on the flow path component 100 of the case 80 from above. Further, the top cover 140 is welded to the side portion 120 of the flow path component 100 of the case 80. Specifically, as shown in FIG. 11, the bottom surface of the top cover 140 is welded to the linear rib 120b of the side portion 120 of the case 80. In this way, the top cover 140 is fixed to the case 80.

[0049] As shown in FIGS. 9 and 10, the top cover 140 closes the plurality of exposed holes 101, the main groove 104, the plurality of sub-grooves 105, the plurality of first air supply grooves 106, and the plurality of second air supply grooves 107 of the case 80. By the top cover 140 closing the main groove 104 and the sub-grooves 105 of the case 80, the main flow path 201 is formed. Also, by the top cover 140 closing the first air supply groove 106 of the case 80, the first air supply flow path 202 is formed, and by the top cover 140 closing the second air supply groove 107 of the case 80, the second air supply flow path 203 is formed.

[0050] As shown in Fig. 9, the upstream connection channel 74 of valve 60A is connected to the main channel 201. As shown in Fig. 10, the downstream connection channel 75 of valve 60A is connected to the first air supply channel 202. In this regard, valve 60A can be said to be a valve that connects and disconnects the main channel 201 and the first air supply channel 202. On the other hand, as shown in Fig. 9, the upstream connection channel 74 of valve 60B is connected to the main channel 201. As shown in Fig. 10, the downstream connection channel 75 of valve 60B is connected to the second air supply channel 203. In this regard, valve 60B can be said to be a valve that connects and disconnects the main channel 201 and the second air supply channel 203.

[0051] In this embodiment, the main channel 201, the first air supply channel 202, and the second air supply channel 203 correspond to the "second channel" formed between the case 80 and the top cover 140. Further, the main channel 201 corresponds to the "inflow channel" that connects the air supply nozzle 85 as the "inflow part" and the upstream end of the upstream connection channel 74 as the "first channel". Also, the first air supply channel 202 and the second air supply channel 203 correspond to the "outflow channels" that connect the downstream end of the downstream connection channel 75 as the "first channel" and the first connection nozzle 86 and the second connection nozzle 87 as the "outflow parts".

[0052] As shown in Figs. 4, 9, and 10, one of the sound-absorbing materials 130 is disposed between the plurality of valves 60A and the first side wall 82 of the case 80 in the first direction D1. Similarly, the other sound-absorbing material 130 is disposed between the plurality of valves 60B and the first side wall 81 of the case 80 in the first direction D1. In the plurality of valves 60, the opening on the atmosphere side of the atmosphere communication passage 65a in the cap 65 faces the sound-absorbing material 130 in the first direction D1.

[0053] As shown in Figs. 3 and 4, the base cover 40 is attached to the case 80 from below. In other words, the base cover 40 is fixed to the case 80. The base cover 40 may be fixed to the case 80 by a so-called snap fit, or may be fixed to the case 80 using a fastening member such as a screw.

[0054] As shown in Fig. 2, the downstream end of the air supply tube 23 is connected to the air supply nozzle 85. Therefore, the main flow path 201 is connected to the pump 21 via the air supply tube 23. The upstream ends of the plurality of connection tubes 24 are respectively connected to the plurality of first connection nozzles 86 and the plurality of second connection nozzles 87. Therefore, the plurality of first air supply flow paths 202 and the plurality of second air supply flow paths 203 are respectively connected to the plurality of air bags 22 via the plurality of connection tubes 24.

[0055] <Relationship between the corresponding valve 60 and the air bag 22> The relationship between one air bag 22 and one valve 60 corresponding to the air bag 22 will be described.

[0056] As shown in Fig. 2, when the valve 60A is in the air supply state, the main flow path 201 and the first air supply flow path 202 are connected, and the first air supply flow path 202 and the atmosphere are blocked. That is, when the valve 60A is in the air supply state, the pump 21 and the air bag 22 are connected, and the air bag 22 and the atmosphere are not connected. On the other hand, when the valve 60A is in the exhaust state, the main flow path 201 and the first air supply flow path 202 are blocked, and the first air supply flow path 202 and the atmosphere are connected. That is, when the valve 60A is in the exhaust state, the air bag 22 and the atmosphere are connected, and the pump 21 and the air bag 22 are not connected. From the above, when the valve 60A is in the air supply state, the corresponding air bag 22 can be inflated by the air supply from the pump 21. On the other hand, when the valve 60A is in the exhaust state, the corresponding air bag 22 can be contracted by the exhaust. Although the valve 60A has been described, the same applies to the valve 60B. Thus, the air supply and exhaust of the air bag 22 are adjusted by one corresponding valve 60.

[0057] <Operation unit 25> The operation unit 25 shown in FIG. 1 is operated by the user to drive the pneumatic system 20. The operation unit 25 may be a remote controller or may be provided on the instrument panel. The operation unit 25 has a start button and an end button for starting and ending the massage using the airbag 22. The operation unit 25 outputs a control signal corresponding to the operated button to the control device 26.

[0058] <Control device 26> The control device 26 shown in FIG. 1 is composed of a processing circuit including a computer and a memory. The control device 26 controls the pump 21 and the valve device 30 based on the program stored in the memory and the operation content of the operation unit 25. Specifically, the control device 26 performs a massage operation of expanding and contracting the plurality of airbags 22 at a predetermined cycle. In other embodiments, the processing circuit constituting the control device 26 may be mounted on the substrate 50 of the valve device 30. That is, the control device 26 may be incorporated in the valve device 30.

[0059] <Massage operation of control device 26> When the start button is operated, the control device 26 starts driving the pump 21. Subsequently, the control device 26 switches the state of the valve 60 between the air supply state and the exhaust state at a predetermined cycle. In other words, the control device 26 alternately switches between a state of supplying power to the valve 60 corresponding to the airbag 22 and a state of not supplying power. In this way, the control device 26 expands and contracts the airbag 22 at a predetermined cycle. During the massage operation, when the end button is operated, the control device 26 stops driving the pump 21. Subsequently, the control device 26 sets the valve 60 to the exhaust state. In other words, the control device 26 stops supplying power to the valve 60 corresponding to the airbag 22. In this way, when the airbag 22 is inflated, the control device 26 contracts the airbag 22.

[0060] As described above, the control device 26 inflates and deflates one airbag 22 by controlling one valve 60. Actually, the control device 26 inflates and deflates a plurality of airbags 22 by controlling a plurality of valves 60 simultaneously. Further, when the user desires a lower body massage, the control device 26 may control a plurality of valves 60 respectively corresponding to the plurality of airbags 22 provided in the seat cushion 11. Similarly, when the user desires an upper body massage, the control device 26 may control a plurality of valves 60 respectively corresponding to the plurality of airbags 22 provided in the seat back 12.

[0061] <Operation of this Embodiment> As an operation of this embodiment, a manufacturing method of the valve device 30 will be described. The manufacturing method of the valve device 30 includes a mounting process, a first welding process, a second welding process, and an assembly process.

[0062] As shown in FIG. 12, the mounting process is a process of mounting a plurality of valves 60 and connectors 52 on the substrate 50. The plurality of valves 60 and connectors 52 are fixed to the substrate 50 by soldering. The plurality of valves 60 may be fixed to the substrate 50 by adhesion and fastening in addition to soldering. As shown in FIG. 12, before the first welding process is performed, the height of the first annular rib 72b is the initial height H1. The same applies to the second annular rib 72c, although illustration is omitted.

[0063] The first welding process is a subsequent process to the mounting process. As shown in FIG. 13, the first welding process is a process of welding the case 80 to the plurality of valves 60 in a state where the case 80 is laminated on the plurality of valves 60 mounted on the substrate 50. Specifically, the first welding process is performed in a state where the tips of the annular ribs 72b and 72c of the connection portion 72 of the plurality of valves 60 are in contact with the lower surface of the first bottom portion 111 of the case 80.

[0064] When welding the valve 60 and the case 80, the laser beam is scanned so as to trace the annular ribs 72b and 72c of the connection portion 72 of the valve 60. At this time, as indicated by the two-dot chain line arrow in FIG. 13, after the laser beam passes through the first bottom portion 111 of the case 80 as the "transmission portion", it is absorbed by the annular ribs 72b and 72c of the connection portion 72 of the valve 60. Subsequently, the annular ribs 72b and 72c of the connection portion 72 of the valve 60 generate heat and melt. Further, the first bottom portion 111 of the case 80 melts due to the heat transmitted from the heat-generating annular ribs 72b and 72c. As a result, the melted portions of the annular ribs 72b and 72c of the connection portion 72 of the valve 60 and the first bottom portion 111 of the case 80 are mixed together. When the irradiation of the laser beam is stopped, the melted portions of the annular ribs 72b and 72c of the connection portion 72 of the valve 60 and the first bottom portion 111 of the case 80 solidify, whereby the two are joined. In this way, the annular ribs 72b and 72c of the connection portion 72 of the valve 60 and the first bottom portion 111 of the case 80 are welded together.

[0065] By performing the first welding step, the upstream connection flow path 74 of the valve 60 and the upstream communication hole 102 of the case 80 are connected without a gap, and the downstream connection flow path 75 of the valve 60 and the downstream communication hole 103 of the case 80 are connected without a gap. In addition, in the first welding step of the present embodiment, the laser beam is irradiated while applying a downward load to the case 80. Therefore, by performing the first welding step, the height of the annular ribs 72b and 72c of the connection portion 72 of the valve 60 becomes lower than the initial height H1. In other words, the first welding step makes the upstream connection flow path 74 and the upstream communication hole 102 connected without a gap and the downstream connection flow path 75 and the downstream communication hole 103 connected without a gap by making the height of the annular ribs 72b and 72c lower than the initial height H1. Further, before the first welding step is performed, the height of the linear rib 120b is the initial height H2.

[0066] The second welding process is a subsequent process to the first welding process. As shown in FIG. 14, the second welding process is a process of welding the top cover 140 to the case 80 in a state where the top cover 140 is laminated on the case 80. Specifically, the second welding process is performed in a state where the tip of the linear rib 120b of the flow path component 100 of the case 80 is in contact with the lower surface of the top cover 140.

[0067] When welding the case 80 and the top cover 140, the laser beam is scanned so as to trace the linear rib 120b of the flow path component 100 of the case 80. At this time, as shown by the two-dot chain line arrow in FIG. 14, the laser beam passes through the top cover 140 and is absorbed by the linear rib 120b of the flow path component 100 of the case 80 as the "absorbing part". Subsequently, the linear rib 120b of the flow path component 100 of the case 80 generates heat and melts. Also, the top cover 140 melts due to the heat transmitted from the heating linear rib 120b. As a result, the melted portions of the linear rib 120b of the flow path component 100 of the case 80 and the top cover 140 are mixed together. When the irradiation of the laser beam is stopped, the melted portions of the linear rib 120b of the flow path component 100 of the case 80 and the top cover 140 solidify, thereby joining the two. In this way, the side portion 120 of the flow path component 100 of the case 80 and the top cover 140 are welded together.

[0068] By performing the second welding process, the main flow path 201, the first air supply flow path 202, and the second air supply flow path 203 are formed. Note that the second welding process also irradiates the laser beam while applying a downward load to the top cover 140. Therefore, by performing the second welding process, the height of the linear rib 120b of the flow path component 100 of the case 80 becomes lower than the initial height H2. In other words, in the second welding process, by making the height of the linear rib 120b lower than the initial height H2, the sealing performance of the main flow path 201, the first air supply flow path 202, and the second air supply flow path 203 is ensured.

[0069] The assembly process is the subsequent process to the second welding process. The assembly process is a process of attaching the base cover 40 after assembling the sound-absorbing material 130 to the intermediate body manufactured through the mounting process, the first welding process, and the second welding process. By performing the assembly process, the valve device 30 is completed.

[0070] <Effects of the present embodiment> (1) By causing the laser light transmitted through the bottom portion 110 of the case 80 as the "transmission portion" to be absorbed by the connection portion 72 of the valve 60, the valve 60 and the case 80 can be welded. Further, by causing the laser light transmitted through the top cover 140 to be absorbed by the side portion 120 of the case 80 as the "absorption portion", the case 80 and the top cover 140 can be welded. Therefore, the valve device 30 can suppress air leakage from the boundary portion between the valve 60 and the case 80, which constitutes the internal flow path, without arranging a sealing member. Also, the valve device 30 can suppress air leakage from the boundary portion between the case 80 and the top cover 140, which constitutes the internal flow path, without arranging a sealing member.

[0071] Also, in that the plurality of valves 60 and the case 80 are directly joined, the upstream connection flow paths 74 of the plurality of valves 60 and the upstream communication holes 102 of the case 80 can be accurately connected. Similarly, the downstream connection flow paths 75 of the plurality of valves 60 and the downstream communication holes 103 of the case 80 can be accurately connected.

[0072] (2) In the valve device 30, the upstream connection flow paths 74 of the plurality of valves 60 are connected to the plurality of upstream communication holes 102 of the case 80, and the downstream connection flow paths 75 of the plurality of valves 60 are connected to the plurality of downstream communication holes 103 of the case 80. In this regard, a comparative example in which a sealing member is provided between the plurality of valves 60 and the case 80 requires a large number of sealing members. In contrast, the valve device 30 welds the plurality of valves 60 and the case 80 by laser welding. Therefore, the valve device 30 does not require a sealing member.

[0073] (3) Since the connection part 72 of the valve 60 has the annular ribs 72b and 72c, when laser-welding the case 80 to the connection part 72 of the valve 60, it becomes possible to heat up the part of the valve 60 to be welded to the case 80 earlier or to melt it earlier. For this reason, it becomes possible to easily laser-weld the valve 60 and the case 80. Similarly, since the side part 120 of the case 80 has the linear rib 120b, when laser-welding the top cover 140 to the side part 120 of the case 80, it becomes possible to heat up the part of the case 80 to be welded to the top cover 140 earlier or to melt it earlier. For this reason, it becomes possible to easily laser-weld the case 80 and the top cover 140.

[0074] (4) In the case 80, the plate thickness T1 of the bottom part 110 is thinner than the plate thickness T2 of the side part 120. In this regard, the valve device 30 can ensure the transmissibility of the laser beam through the first bottom part 111 of the case 80 in the first welding process by making the plate thickness T1 of the first bottom part 111 of the case 80 thinner. On the other hand, the valve device 30 can ensure the rigidity of the case 80 by making the plate thickness T2 of the side wall of the case 80 thicker.

[0075] (5) In the valve device 30, the shape of the upstream opening of the upstream connection flow path 74 of the valve 60 and the shape of the downstream opening of the upstream communication hole 102 of the case 80 are the same shape. Similarly, the shape of the downstream opening of the downstream connection flow path 75 of the valve 60 and the shape of the upstream opening of the downstream communication hole 103 of the case 80 are the same shape. Therefore, the valve device 30 can suppress an increase in the loss that occurs when air flows from the case 80 to the valve 60 or when air flows from the valve 60 to the case 80.

[0076] (6) In the first welding process and the second welding process, the irradiation direction of the laser beam for laser welding is the same direction. For this reason, after the first welding process is completed and before the second welding process is started, there is no need to change the orientation of the welded plurality of valves 60 and the case 80.

[0077] <Modification Example> This embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0078] · The valve 60 in the above - described embodiment can be changed to the valve 60X shown in FIG. 15. Note that FIG. 15 shows a modification example of the region surrounded by the two - dot chain line in FIG. 11. As shown in FIG. 15, in the valve 60X, the connection portion 72X of the base 70X has a concave groove 72d that is recessed downward from the main surface 72a. That is, the concave groove 72d is recessed in the direction opposite to the protruding direction of the first annular rib 72b. The concave groove 72d is located between the first annular rib 72b and the opening of the upstream - side connection flow path 74. Therefore, when looking at the main surface 72a from above, the concave groove 72d is annular and rectangular. Although not shown, the connection portion 72X has a concave groove 72d located between the second annular rib 72c and the opening of the downstream - side connection flow path 75.

[0079] As shown in FIG. 15, when laser - welding the valve 60X and the case 80, the first annular rib 72b of the connection portion 72X of the valve 60X melts. In this regard, the connection portion 72X of the valve 60X has a concave groove 72d between the opening of the upstream - side connection flow path 74 and the first annular rib 72b. Therefore, the valve device 30 can store the melted first annular rib 72b in the concave groove 72d as shown by the dot - shaped hatching in FIG. 15. Thus, the valve device 30 can suppress the melted first annular rib 72b from flowing into the upstream - side connection flow path 74 of the valve 60X. Note that the volume of the concave groove 72d is preferably equal to or greater than the melting volume of the first annular rib 72b when laser - welding the valve 60X and the case 80. Although the description is omitted, the same applies when the second annular rib 72c melts.

[0080] · The side portion 120 of the case 80 may have a configuration corresponding to the concave groove 72d in the above - described modification example. According to this, in the second welding step, it is possible to suppress the melted linear rib 120b from flowing out into the main flow path 201, the first air supply flow path 202, and the second air supply flow path 203.

[0081] · The connecting parts 72 of the plurality of valves 60 only need to be configured such that at least the parts welded to the case 80 can absorb laser light. Specifically, the connecting parts 72 of the plurality of valves 60 only need to be configured such that at least the annular ribs 72b and 72c can absorb laser light.

[0082] · The top cover 140 only needs to be configured such that at least the parts welded to the case 80 can transmit laser light. · In the base 70 of the valve 60 and the case 80, the parts made of a light-absorbing thermosetting resin can also be made of a light-transmitting thermosetting resin. In this case, in the base 70 of the valve 60 and the case 80, the parts that need to absorb laser light are preferably colored so as to be able to absorb laser light.

[0083] · In the connecting part 72 of the valve 60, the annular ribs 72b and 72c can be omitted. In this case, the first welding step is a step of laser-welding the main surface 72a of the connecting part 72 of the valve 60 and the first bottom part 111 of the case 80. Alternatively, the first bottom part 111 of the case 80 may have a structure corresponding to the annular ribs 72b and 72c.

[0084] · In the side part 120 of the case 80, the linear rib 120b can be omitted. In this case, the second welding step is a step of laser-welding the front end surface 120a of the side part 120 of the case 80 and the top cover 140. Alternatively, the top cover 140 may have a structure corresponding to the linear rib 120b.

[0085] · In the part where the connecting part 72 of the valve 60 and the first bottom part 111 of the case 80 face each other in the vertical direction D3, the shape of the opening of the upstream connecting flow path 74 of the valve 60 does not have to be the same as the shape of the opening of the upstream communication hole 102 of the case 80. Similarly, in the part where the connecting part 72 of the valve 60 and the first bottom part 111 of the case 80 face each other in the vertical direction D3, the shape of the opening of the downstream connecting flow path 75 of the valve 60 does not have to be the same as the shape of the opening of the downstream communication hole 103 of the case 80.

[0086] · In the case of the case 80, the plate thickness T1 of the first bottom portion 111 that transmits the laser light may be equal to or greater than the plate thickness T2 of the side portion 120 that absorbs the laser light. · The plurality of nozzles 85, 86, 87 may have a configuration that allows fluid to flow into or out of the valve device 30. For example, the plurality of nozzles 85, 86, 87 may be connectors or tubes.

[0087] · The use of the valve device 30 is not limited to the seat 10 having the airbag 22. The valve device 30 may be applied to a fluid system that supplies or discharges fluid. · The valve device 30 may be any flow path member through which fluid can flow. That is, the plurality of valves 60X are not an essential component of the flow path member. The flow path member may be constituted by at least three laminates.

[0088] · The airbag 22 does not have to be a massage airbag. The airbag 22 may be a support airbag that supports the user's back when the inflated state is maintained. · The configuration of the internal flow path in the first laminate, the second laminate, and the third laminate can be appropriately changed.

[0089] <Summary of this embodiment> The flow path member is a flow path member provided with an internal flow path, and includes a first laminate, a second laminate welded to the first laminate in a state of being laminated on the first laminate, and a third laminate welded to the second laminate in a state of being laminated on the second laminate. The internal flow path is provided across the first laminate, the second laminate, and the third laminate. The second laminate has a transmission portion that transmits laser light, the transmission portion being welded to the first laminate, and an absorption portion that absorbs laser light, the absorption portion being welded to the third laminate. In the first laminate, at least a portion welded to the transmission portion of the second laminate is configured to absorb laser light. In the third laminate, at least a portion welded to the absorption portion of the second laminate is configured to transmit laser light.

[0090] By causing the first laminate to absorb the laser light transmitted through the transmission portion of the second laminate, the first laminate and the second laminate can be welded. Also, by causing the absorption portion of the second laminate to absorb the laser light transmitted through the third laminate, the second laminate and the third laminate can be welded. Therefore, the flow path member can suppress fluid from leaking from the boundary portion between the first laminate and the second laminate that constitutes the internal flow path or from the boundary portion between the second laminate and the third laminate that constitutes the internal flow path without arranging a seal member.

[0091] In the flow path member, the internal flow path has a first flow path provided in the first laminate and a second flow path connected to the first flow path and formed between the second laminate and the third laminate. The second laminate has an inflow portion through which fluid flows in and an outflow portion through which fluid flows out. The second flow path includes an inflow channel connecting the inflow portion and the upstream end of the first flow path and an outflow channel connecting the downstream end of the first flow path and the outflow portion. The first laminate is a solenoid valve having a valve body that opens and closes the first flow path.

[0092] The flow path member functions as a valve device that switches between a state where the fluid flowing in from the inflow portion flows out from the outflow portion and a state where it does not flow out from the outflow portion by driving the valve body of the solenoid valve. That is, the flow path member can easily configure such a valve device by laser welding.

[0093] In the flow path member, the first laminate is an annular rib that surrounds the periphery of the opening of the first flow path, and has the annular rib extending toward the second laminate, and the second laminate is welded to the annular rib of the first laminate.

[0094] Since the first laminate has an annular rib, when laser welding, it is possible to heat the portion of the first laminate to be welded to the second laminate early or to melt it early. Therefore, it becomes possible to easily laser weld the first laminate and the second laminate.

[0095] In the flow path member, the first laminate has a concave groove that is recessed in a direction opposite to the protruding direction of the annular rib between the opening of the first flow path and the annular rib. When laser welding the first laminate and the second laminate, the annular rib melts. In this regard, the flow path member has a concave groove between the opening of the first flow path and the annular rib. Therefore, the flow path member can store the melted annular rib in the concave groove. Thus, the flow path member can suppress the melted annular rib from flowing into the first flow path or the second flow path.

[0096] In the flow path member, when the direction in which the first laminate, the second laminate, and the third laminate are laminated is defined as the lamination direction, the transmission portion of the second laminate includes a bottom portion having the lamination direction as the plate thickness direction, and the absorption portion of the second laminate includes a side portion having a direction orthogonal to the lamination direction as the plate thickness direction, and the plate thickness of the bottom portion is thinner than the plate thickness of the side portion.

[0097] The flow path member can ensure the laser light transmissivity in the transmission portion by making the plate thickness of the bottom portion of the second laminate thin. On the other hand, the flow path member can ensure the rigidity of the second laminate by making the plate thickness of the side portion of the second laminate thick.

[0098] In the flow path member, in the first laminate, the shape of the opening of the first flow path facing the second laminate is the same as the shape of the opening of the second flow path facing the first laminate in the second laminate.

[0099] When the shape of the opening of the first flow path and the shape of the opening of the second flow path are significantly different, there is a risk that the loss generated when the fluid flows through the internal flow path of the flow path member will increase. In this regard, in the flow path member, since the shape of the opening of the first flow path and the shape of the opening of the second flow path are the same, the loss generated when the fluid flows through the internal flow path of the flow path member is less likely to increase.

Explanation of Reference Numerals

[0100] 20…Pneumatic system, 22…Airbag, 30…Valve device (flow path member), 60, 60X…Valve (first laminate), 64…Valve body, 72, 72X…Connection part, 72a…Main surface, 72b…First annular rib, 72c…Second annular rib, 72d…Groove, 74…Upstream connection flow path (first flow path), 75…Downstream connection flow path (first flow path), 80…Case (second laminate), 85…Air supply nozzle (inflow part), 86…First connection nozzle (outflow part), 87…Second connection nozzle (outflow part), 100…Flow path component, 110…Bottom part, 111…First bottom part, 120…Side part, 120a…Tip surface, 120b…Linear rib, 140…Top cover (third laminate), 201…Main flow path (inflow flow path of the second flow path), 202…First air supply flow path (outflow flow path of the second flow path), 203…Second air supply flow path (outflow flow path of the second flow path)

Claims

1. A flow path member provided with an internal flow path, a first laminate, a second laminate welded to the first laminate in a state of being laminated on the first laminate, and a third laminate welded to the second laminate in a state of being laminated on the second laminate, wherein the internal flow path is provided across the first laminate, the second laminate, and the third laminate, the second laminate is a transmissive portion that transmits laser light, the transmissive portion being welded to the first laminate, and an absorptive portion that absorbs laser light, the absorptive portion being welded to the third laminate, in the first laminate, at least a portion welded to the transmissive portion of the second laminate is configured to absorb laser light, in the third laminate, at least a portion welded to the absorptive portion of the second laminate is configured to transmit laser light Flow path member.

2. The internal flow path has a first flow path provided in the first laminate and a second flow path connected to the first flow path and configured between the second laminate and the third laminate, the second laminate has an inflow portion into which fluid flows and an outflow portion for discharging the fluid, the second flow path includes an inflow flow path connecting the inflow portion and the upstream end of the first flow path and an outflow flow path connecting the downstream end of the first flow path and the outflow portion, the first laminate is a solenoid valve having a valve body for opening and closing the first flow path The flow path member according to claim 1.

3. The first laminate is an annular rib surrounding the periphery of the opening of the first flow path, and has the annular rib extending toward the second laminate, the second laminate is welded to the annular rib of the first laminate The flow path member according to claim 2.

4. The first laminate has a concave groove that is recessed in a direction opposite to the protruding direction of the annular rib between the opening of the first flow path and the annular rib. The flow path member according to claim 3.

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