Fluid control device

Abstract

The invention provides a fluid control device. The fluid control valve (4) is provided on the outside of the case (6), the case (6) is provided with a through part (61) through which a cable (C) connecting a connector (51) provided on the control board (5) and the fluid control valve (4) passes, and the case (6) is provided with a gasket (7) that blocks between the cable (C) and a surface (61x) of the case (6) on which the through part (61) is formed.

Description

Technical Field

[0001] This invention relates to a fluid control device for controlling fluid flowing in a flow path. Background Technology

[0002] Conventionally, as shown in Patent Document 1, a fluid control device includes: a main body having a flow path formed therein; a fluid control valve mounted on the main body for controlling the fluid flowing in the flow path; a circuit board for controlling the fluid control valve; and a housing mounted on the main body. In the above-described fluid control device, the housing houses the fluid control valve and the circuit board, which are electrically connected via a cable. Existing technical documents Patent documents

[0003] Patent Document 1: Japanese Patent Application Publication No. 2023-66604 Summary of the Invention The problem that the invention aims to solve

[0004] Here, when using the aforementioned fluid control device for flow control, the heat dissipation from the fluid control valve may affect the circuit board depending on the flow rate. Therefore, the fluid control valve needs to be located on the outside of the housing containing the circuit board.

[0005] In this case, the cable connecting the fluid control valve to the circuit board passes through the housing, so dust and water may enter the housing through the through-hole. This is especially true when the fluid control device is located outdoors, where the likelihood of dust and water entering the housing is even higher.

[0006] Therefore, the present invention was made in view of the above-mentioned problems, the main problem of which is to prevent dust and / or water from entering the interior of the housing in a structure in which the fluid control valve is located on the outside of the housing. Methods for solving problems

[0007] That is, the fluid control device of the present invention controls a fluid flowing in a flow path, characterized in that it comprises: a fluid control valve for controlling the fluid; a control board for controlling the fluid control valve; and a housing for housing the control board, wherein the fluid control valve is disposed on the outside of the housing, a through portion is formed in the housing for a cable connected to the fluid control valve by a connector disposed on the control board, and a gasket is provided in the fluid control device to block the space between the surface of the housing forming the through portion and the cable.

[0008] With this structure, a gasket is placed between the through-hole surface of the enclosure and the cable, blocking the space between them. Therefore, even if the fluid control valve is located on the outside of the enclosure, dust and water can be prevented from entering the interior of the enclosure from between the through-hole surface and the cable. As a result, control boards and the like can be prevented from malfunctioning due to dust and / or water. In addition, since the fluid control valve is located on the outside of the housing, it can prevent the control board and other components from malfunctioning due to heat dissipation from the fluid control valve.

[0009] Preferably, the box body comprises: a box body, the box body being cylindrical with at least an upper opening; a cover covering the upper opening of the box body; and a sealing member sandwiched between the box body and the cover.

[0010] If it is such a structure, the sealing components can make the cover and the main body of the box airtight.

[0011] Preferably, the through portion is formed by a notch extending downward from the upper end of the main body of the box and / or upward from the lower end of the cover, and the gasket has a sealing member abutment portion, which abuts against the sealing member when the cover covers the upper opening of the main body of the box.

[0012] With such a structure, since the through section is formed by a notch from the upper end of the main body of the enclosure downwards, the cable can be passed directly through the through section from the upper end of the main body of the enclosure, which can improve the assemblability of the fluid control device. Furthermore, the through portion is formed at the upper end of the main body of the box. If the cover covers the upper opening of the main body of the box, the sealing part of the gasket abuts against the sealing part, so that the gasket can be fixed to the main body of the box via the sealing part.

[0013] Preferably, the housing has a sidewall portion surrounding the side of the control base plate, and the through portion is formed on the sidewall portion opposite to the fluid control valve and / or on the cover portion opposite to the fluid control valve.

[0014] With this structure, the through-hole is formed on the side of the sidewall opposite the fluid control valve side, so the cable passes through the space between the fluid control valve and the housing and connects to the connector via the through-hole. Therefore, the cable does not need to go around the outside of the housing, thus reducing the possibility of cable damage, such as getting the cable caught on surrounding objects.

[0015] Preferably, the external extension of the fluid control valve is located on the side opposite to the through portion, and the external extension is the part where the cable extends outward from the fluid control valve.

[0016] With this structure, the external protrusion is located on the side opposite to the through section, thus shortening the cable length. As a result, the possibility of cable damage can be further reduced, and cable costs can be lowered. Furthermore, the external protrusion is located on the side opposite to the through section, which reduces the area of ​​the cable exposed to the outside and prevents the cable from being affected by external electrical noise.

[0017] Preferably, the gasket has: an outer sealing portion that seals the outer surface of the housing where the through portion is formed; and an inner sealing portion that seals the inner surface of the housing where the through portion is formed.

[0018] With this structure, the outer sealing part and the inner sealing part seal the outer surface and inner surface of the box respectively, thus further improving the sealing performance of the box.

[0019] Preferably, the outer sealing portion and the inner sealing portion are connected to each other, sandwiching the two sides of the box body on which the through portion is formed.

[0020] If it is such a structure, the outer sealing part and the inner sealing part are connected to each other, sandwiching the outer surface and inner surface of the box with the through part, thus preventing the gasket from falling off to the inside and outside of the box.

[0021] Preferably, the gasket has: an annular portion, which is annular in shape and has a retaining hole formed through it in the thickness direction to retain the cable; and a slit formed from the outer peripheral surface of the annular portion toward the retaining hole, such that the cable can be inserted into the retaining hole.

[0022] With such a structure, the cable can be inserted into the retaining hole of the liner through the slit while the cable is connected to the connector and the fluid control valve. When the liner is inserted into the housing, a force from the outer circumferential surface of the annular portion toward the retaining hole acts, so the retaining hole can hold the cable in an airtight manner.

[0023] Preferably, the sealing member is frame-shaped along the opening edge of the upper opening of the main body of the box, and the positioning part for positioning the sealing member is formed at the opening edge of the upper opening of the main body of the box and / or the cover.

[0024] With this structure, the sealing component is positioned by the positioning part, thus further improving the sealing performance achieved by the sealing component.

[0025] Preferably, the cover has a through hole extending from the upper surface to the lower surface, and the housing also has a surface seal covering the through hole.

[0026] If such a structure is used, then in the case where through holes such as communication ports or maintenance holes are formed in the cover, the through holes can be blocked by a face seal.

[0027] As a specific embodiment of the fluid control device, an example is a flow path block in which the flow path is formed internally, and the fluid control valve, the control board, and the housing are disposed on one side of the flow path block. Invention Effects

[0028] According to the present invention, in a structure in which the fluid control valve is located on the outside of the housing, dust and / or water can be prevented from entering the interior of the housing. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view schematically illustrating the structure of the fluid control device according to the first embodiment of the present invention. Figure 2 This is a top view of a fluid control device with the same implementation. Figure 3 This is an exploded perspective view of the box body with the same implementation method. Figure 4 This is a sectional view of the fluid control device according to the same embodiment. Figure 5 This is a perspective view of a gasket with the same implementation method. Figure 6 They are the same implementation methods Figure 1 A partially enlarged sectional view of the dashed-lined portion. Figure 7 This is a perspective view of the fluid control device according to the second embodiment of the present invention. Figure 8 This is an exploded perspective view of the box body according to the second embodiment. Figure 9 This is a perspective view of the cover according to the second embodiment. Figure 10 This is the second embodiment. Figure 7 An enlarged 3D view of the dashed line portion. Detailed Implementation

[0030] <First Embodiment of the Invention> The fluid control device according to the first embodiment of the present invention will now be described using the accompanying drawings. Furthermore, for ease of understanding, some figures shown below may be appropriately omitted or exaggerated and depicted schematically. The same reference numerals are used to label the same components, and descriptions are appropriately omitted.

[0031] <Device Structure> The fluid control device 100 of this embodiment is provided in a gas flow path for gas flow and controls the flow rate of the gas flowing in these gas flow paths.

[0032] Specifically, such as Figure 1 as well as Figure 2 As shown, the fluid control device 100 includes: a flow path block 2, which has a flow path R formed inside for the flow of fluids such as gas; a fluid sensor 3, which measures the flow rate of the fluid flowing in the flow path R; a fluid control valve 4, which controls the fluid; a control board 5, which controls the fluid control valve 4; and a housing 6, which houses at least the control board 5. The structure of each part will be described below.

[0033] The flow path block 2 is, for example, rectangular in shape, and a fluid sensor 3, a fluid control valve 4, a control board 5, and a housing 6 are mounted on a designated side. The flow path block 2 is provided with an inlet (not shown) for introducing fluid into the flow path R, and an outlet (not shown) for discharging fluid from the flow path R.

[0034] The fluid sensor 3 here is a differential pressure fluid sensor. Specifically, the fluid sensor 3 has: an upstream pressure sensor 3a, which is disposed upstream of a resistance element Z such as a throttle or orifice disposed in the flow path R; and a downstream pressure sensor 3b, which is disposed downstream of the resistance element Z. In addition, the flow rate is calculated based on the differential pressure between the two pressure sensors 3a and 3b by the flow calculation unit (not shown) of the control board 5, which will be described later.

[0035] The fluid control valve 4 is a solenoid valve that uses a solenoid as an actuator. The solenoid moves the valve core back and forth relative to the valve seat, thereby controlling the flow rate. Specifically, the fluid control valve 4 includes a solenoid 41 as an actuator and a housing 42 that houses the solenoid 41. Here, a cable C that electrically connects the fluid control valve 4 and the control board 5 extends from the housing 42 to the control board 5. Furthermore, the fluid control valve 4 is controlled by the valve control section (not shown) of the control board 5, which will be described later.

[0036] The control board 5 is fixed to the housing 6 with its side facing upwards relative to the flow path block 2. Specifically, the control board 5 has digital circuits such as a CPU, memory, and communication circuits, as well as analog circuits such as amplifiers and buffers formed on the wiring board. Through the cooperation of the CPU and other peripheral devices according to the program stored in the memory, it performs the functions of a flow calculation unit that calculates the flow rate in the flow path R based on the pressure measured by the fluid sensor 3, and a valve control unit that controls the fluid control valve 4 to make the flow rate reach a preset target flow rate.

[0037] Alternatively, the control board 5 can be divided into a board that functions as a flow calculation unit and a board that functions as a valve control unit. In this case, the fluid sensor 3 is connected to the board that functions as a flow calculation unit, and the fluid control valve 4 is connected to the board that functions as a valve control unit.

[0038] like Figures 1-3 As shown, the housing 6 is approximately cuboid in shape, with an internal space for housing the fluid sensor 3 and the control board 5. The fluid control valve 4 is located on the outside of the housing 6, as shown... Figure 3 As shown, a through-hole 61 is formed in the housing 6, which is a space for the cable C connecting the fluid control valve 4 to the connector 5a provided on the control board 5 to pass through. Specifically, especially as Figure 3 As shown, the housing 6 includes: a housing body 62, which is cylindrical with at least an upper opening; a cover 63, which covers the upper opening of the housing body 62; and a sealing member 64, which is sandwiched between the housing body 62 and the cover 63. Hereinafter, the direction from the housing body 62 toward the cover 63 will be defined as upward, and the direction from the housing body 62 toward the flow path block 2 will be defined as downward.

[0039] The main body 62 of the housing is the sidewall portion surrounding the control board 5, and in this embodiment, it is generally cylindrical with openings at the upper and lower ends. Figure 1 as well as Figure 2 As shown, one side of the housing body 62 faces the fluid control valve 4, and a through portion 61 is formed in the housing body 62 on the side facing the fluid control valve 4. More specifically, an external protrusion 4a for the cable C to extend outward from the fluid control valve 4 is formed in the fluid control valve 4, and the external protrusion 4a is provided on the side facing the through portion 61. Alternatively, the external protrusion 4a may also be provided on the side opposite to the through portion 61. Furthermore, here, the external protrusion 4a is formed in the opening of the housing 42 of the fluid control valve 4, but the external protrusion 4a may also be a connector provided in the fluid control valve 4.

[0040] Here, as Figure 1 as well as Figure 2 As shown, the external protrusion 4a, the through portion 61, and the connector 5a are arranged on the same straight line. More specifically, as... Figure 1 As shown, in a cross-sectional view along the long side of the housing body 62 through the through-section 61, the external protrusion 4a, the through-section 61, and the connector 5a are arranged at the same height. Alternatively, in a cross-sectional view along the long side of the housing body 62 through the through-section 61, the external protrusion 4a, the through-section 61, and the connector 5a may also be arranged at different heights.

[0041] Furthermore, such as Figure 4As shown, the through portion 61 is formed by notching down the side wall of the box body 62 from the upper end of the box body 62. Here, in a side view viewed from the side wall where the through portion 61 is formed, the side wall of the box body 62 is notched in such a way that the bottom of the surface 61x where the through portion 61 is formed is arc-shaped, thereby forming the through portion 61.

[0042] The cover 63 is generally rectangular and flat, and its lower surface blocks the upper opening of the main body 62. In this embodiment, especially as... Figure 1 as well as Figure 6 As shown, the cover 63 abuts against the upper end face of the housing body 62 and the upper surface of the sealing member 64. Furthermore, a connecting wall 63w is formed in the cover 63, which connects the abutting surface abutting against the upper end face of the housing body 62 and the abutting surface abutting against the upper surface of the sealing member 64. In this embodiment, the connecting wall 63w abuts against the side of the housing body 62. Thus, the cover 63 is positioned on the housing body 62. Figure 2 as well as Figure 3 As shown, bolt holes bh are formed at the four corners of the cover 63 for bolts B to be inserted. The bolts B fix the cover 63 and the sealing component 64 to the main body 62 of the box.

[0043] In this embodiment, a bolt B that passes through the main body 62, the cover 63, and the sealing member 64 is inserted into each bolt hole bh, but the bolt B can also be divided. For example, the bolt B can also be divided into bolt elements that fasten the flow path block 2, the main body 62, and the sealing member 64, and bolt elements that fasten the main body 62, the cover 63, and the sealing member 64.

[0044] like Figure 2 As shown, a through hole 63h is formed in the cover 63, extending from the upper surface to the lower surface of the cover 63. The through hole 63h is, for example, a communication port or a maintenance hole. In addition, the housing 6 also has a surface seal 65 covering the through hole 63h.

[0045] The sealing component 64 is roughly rectangular in shape, as shown here... Figure 1 as well as Figure 4 As shown, they are respectively located at the upper and lower ends of the main body 62 of the box. Specifically, as... Figure 3 As shown, the sealing member 64 is in the shape of a frame along the opening edge at the upper end and the opening edge at the lower end of the housing body 62.

[0046] In this embodiment, such as Figures 1-4 as well as Figure 6 As shown, positioning portions 62a for positioning the sealing member 64 are formed at the opening edges of the upper and lower ends of the housing body 62. Additionally, as... Figure 3As shown, bolt holes bh are formed at the four corners of the sealing component 64 for bolt B to be inserted.

[0047] The positioning part 62a is formed along the opening edge at the upper end and the opening edge at the lower end of the housing body 62. Specifically, as shown... Figure 1 as well as Figure 4 As shown, the positioning portion 62a is a recessed portion that extends downward from the upper end of the housing body 62 and a recessed portion that extends upward from the lower end of the housing body 62. With the lower surface of the sealing member 64 in contact with the bottom surface of the positioning portion 62a, the side surface of the sealing member 64 contacts the side surface of the positioning portion 62a that rises from the bottom surface of the positioning portion 62a, thereby positioning the sealing member 64 onto the housing body 62. Furthermore, as... Figure 3 As shown, bolt holes bh for inserting bolts B are formed at the four corners of the positioning part 62a.

[0048] Moreover, such as Figure 4 as well as Figure 6 As shown, a gasket 7 is provided between the surface 61x forming the through-hole 61 in the housing 6 and the cable C to block the gap between them. The gasket 7 is provided on the side wall where the through-hole 61 is formed. Figures 4-6 As shown, the gasket 7 is annular and has: an annular portion 71 through which a retaining hole 7h for holding the cable C is formed in the thickness direction; and a slit 72 formed from the outer peripheral surface of the annular portion 71 toward the retaining hole 7h. Furthermore, the gasket 7 is made of an elastic component such as resin.

[0049] The annular portion 71 airtightly seals the gap between the surface 61x of the through portion 61 and the cable C. Specifically, especially as Figure 6 As shown, the cable C is inserted into the retaining hole 7h via the slit 72, and the retaining hole 7h retains the cable C in an airtight manner. Then, the annular portion 71 airtightly blocks the gap between the surface 61x forming the through portion 61 and the cable C by blocking the through portion 61.

[0050] like Figure 5 as well as Figure 6 As shown, an outer sealing portion 73 is formed on the outer periphery of the annular portion 71 to seal the outer surface of the sidewall where the through portion 61 is formed, and an inner sealing portion 74 is formed to seal the inner surface of the sidewall where the through portion 61 is formed. The outer sealing portion 73 and the inner sealing portion 74 are connected to each other, sandwiching the two surfaces of the sidewall where the through portion 61 is formed. Specifically, a groove 75 is formed between the outer sealing portion 73 and the inner sealing portion 74, and the outer sealing portion 73 and the inner sealing portion 74 are connected to each other via the groove 75. Furthermore, by embedding the groove 75 into the sidewall where the through portion 61 is formed, the outer sealing portion 73 and the inner sealing portion 74 sandwich the two surfaces of the sidewall where the through portion 61 is formed. In addition, in this state, the bottom surface of the groove 75 is in contact with the surface 61x where the through portion 61 is formed.

[0051] Here, as Figure 5 as well as Figure 6 As shown, on the side opposite to the slit 72, opposite to the retaining hole 7h, the upper end of the outer sealing portion 73 and the upper end of the inner sealing portion 74 have different heights, thus forming a stepped portion 7w. Specifically, the upper end face of the inner sealing portion 74 is positioned lower than the upper end face of the outer sealing portion 73. In this embodiment, the upper end face of the outer sealing portion 73 and the upper end face of the groove portion 75 are at the same height. Furthermore, the upper end face of the groove portion 75 functions as a cover abutment portion 7a, abutting against the cover 63 when the cover 63 covers the upper opening of the box body 62. In addition, the upper end face of the inner sealing portion 74 functions as a sealing member abutment portion 7b, abutting against the sealing member 64 when the cover 63 covers the upper opening of the box body 62.

[0052] The cover abutment portion 7a is a flat surface that abuts against the abutment surface of the lower surface of the cover 63 that abuts against the upper end surface of the box body 62. When the gasket 7 is installed in the box body 6, the cover abutment portion 7a is coplanar with the upper end surface of the box body 62.

[0053] The sealing member abutment portion 7b is a flat surface that abuts against the lower surface of the sealing member 64. When the gasket 7 is installed in the housing 6, the sealing member abutment portion 7b is coplanar with the bottom surface of the positioning portion 62a, and a portion of the sealing member abutment portion 7b is located inside the sealing member 64.

[0054] <Assembly Method of Fluid Control Device> Next, the assembly method of the fluid control device of this embodiment will be described.

[0055] First, the fluid sensor 3, the fluid control valve 4, and the control board 5 are mounted on one side of the flow path block 2.

[0056] Next, the sealing member 64 is disposed on one side of the flow path block 2 such that the fluid sensor 3 and the control board 5 are surrounded within the frame of the sealing member 64. Alternatively, the sealing member 64 may be disposed on one side of the flow path block 2 first, and then the fluid sensor 3 and the control board 5 may be mounted on one side of the flow path block 2 within the frame of the sealing member 64.

[0057] Next, the housing body 62 is disposed on one side of the flow path block 2 where the sealing member 64 is located. Specifically, the positioning part 62a formed at the lower end of the housing body 62 abuts against the sealing member 64. As a result, the fluid sensor 3 and the control board 5 are surrounded by the housing body 62, and the fluid control valve 4 is disposed on the outside of the housing body 62.

[0058] Next, cable C is passed through the through-part 61, and the external protrusion 4a of fluid control valve 4 is electrically connected to connector 5a of control board 5 via cable C.

[0059] Next, the spacer 7 blocks the space between the surface 61x of the through portion 61 in the housing body 62 and the cable C. Specifically, the cable C is inserted into the slit 72 of the spacer 7, and the cable C is inserted into the retaining hole 7h from the slit 72 of the spacer 7. Then, the sidewall with the through portion 61 is sandwiched between the inner surface of the outer sealing portion 73 and the outer surface of the inner sealing portion 74. In this state, the cover abutment portion 7a is at the same height as the upper end surface of the housing body 62, and the sealing member abutment portion 7b is coplanar with the bottom surface of the positioning portion 62a formed at the upper end of the housing body 62.

[0060] Next, the sealing member 64 is positioned by abutting against the positioning portion 62a formed on the upper end of the housing body 62. In this state, the upper end surface of the housing body 62 is coplanar with the cover abutment portion 7a.

[0061] Next, the upper opening of the housing body 62 is covered by the cover 63. The lower surface of the cover 63, located above the connecting wall 63w, abuts against the upper end face of the housing body 62 and the cover abutment portion 7a. Furthermore, the lower surface of the cover 63, located below the connecting wall 63w, abuts against the upper surface of the sealing member 64. The lower surface of the sealing member 64 abuts against the positioning portion 62a and the sealing member abutment portion 7b. Therefore, by covering the upper opening of the housing body 62 with the cover 63, the gasket 7 is fixed to the housing body 62 via the sealing member 64.

[0062] Next, bolt B is inserted into the bolt hole bh formed in the positioning part 62a, the cover 63, and the sealing member 64. Then, bolt B is tightened to fix the housing 6 relative to the flow path block 2.

[0063] <Effects of the first implementation method> According to the fluid control device 100 of the first embodiment, a gasket 7 is provided between the cable C and the through portion 61 to block their gap. Therefore, even if the fluid control valve 4 is located on the outside of the housing 6, dust and water can be prevented from entering the interior of the housing 6 through the gap between the cable C and the through portion 61. As a result, the control board 5 and the like can be prevented from malfunctioning due to dust and / or water. Furthermore, since the fluid control valve 4 is located on the outside of the housing 6, and the housing 6 is sealed, the heat from the fluid control valve 4 can be prevented from affecting the electronic components inside the housing 6, thus preventing any impact on the accuracy of flow measurement. In addition, since the fluid control valve 4 is located on the outside of the housing 6, it can prevent the control board 5 and other components from malfunctioning due to heat dissipation from the fluid control valve 4.

[0064] <Second Embodiment of the Invention> Hereinafter, the fluid control device according to the second embodiment of the present invention will be described using the accompanying drawings. Furthermore, the parts that differ from those in the first embodiment will be described below, and the same reference numerals will be used to denote the same parts.

[0065] In the first embodiment, a through portion 61 is formed by notching the main body 62 of the box. In contrast, in the second embodiment, unlike the first embodiment, a through portion 61 is formed by notching the cover 63.

[0066] Specifically, such as Figure 7 as well as Figure 8 As shown, the through portion 61 is formed by an upward notch from the lower end of the cover 63. More specifically, the through portion 61 is formed in the side wall of the cover 63 by an upward notch from the lower end of the side wall. Here, especially as... Figure 8 as well as Figure 9 As shown, the side wall of the cover 63 is notched in such a rounded manner that the bottom of the surface 61x that forms the through portion 61 is arc-shaped, thereby forming the through portion 61.

[0067] Especially Figure 9 As shown, in the second embodiment, a sealing positioning portion 63a is formed on the cover 63 to position the sealing member 64. Specifically, the sealing member 64 is frame-shaped, and the sealing positioning portion 63a is formed on the surface of the cover 63 that blocks the upper opening of the housing body 62, and is a slit into which the sealing member 64 is inserted. By inserting the sealing member 64 into the sealing positioning portion 63a, the sealing member 64 is positioned relative to the cover 63.

[0068] Here, as Figure 8 As shown, sealing member mounting portions 62c for mounting sealing members 64 are formed at the upper end of the housing body 62. Specifically, the sealing member mounting portions 62c are surfaces formed along the opening edges at the upper and lower ends of the housing body 62. More specifically, the sealing member mounting portions 62c are frame-shaped surfaces that follow the shape of the sealing member 64. With one side of the sealing member 64 in contact with the sealing member mounting portions 62c, the other side of the sealing member 64 is inserted into the sealing positioning portion 63a, thereby positioning the sealing member 64 relative to the housing body 6.

[0069] In the second embodiment, the gasket 7 is provided on the side wall of the cover 63, where the through portion 61 is formed. For example... Figure 8 as well as Figure 10As shown, the gasket 7 is generally annular, and a retaining hole 7h is formed through it in the thickness direction to retain the cable C. The retaining hole 7h can airtightly retain the cable C, through which the cable C passes. Furthermore, the gasket 7 of the second embodiment does not have a slit formed from the outer peripheral surface toward the retaining hole 7h, but it may have a slit.

[0070] Specifically, the gasket 7 has: an outer sealing portion 73 that seals the outer surface of the side wall of the cover 63 having the through portion 61; and an inner sealing portion 74 that seals the inner surface of the side wall of the cover 63 having the through portion 61. The outer peripheral surface of the outer sealing portion 73 and the outer peripheral surface of the inner sealing portion 74 are composed of an arc-shaped region that is arc-shaped along the through portion 61 and a flat region formed on the opposite side of the arc-shaped region.

[0071] A groove 75 is formed between the outer sealing portion 73 and the inner sealing portion 74, and the outer sealing portion 73 and the inner sealing portion 74 are connected to each other via the groove 75. Furthermore, the side wall of the cover 63, which has the through portion 61, is embedded in the groove 75, thereby sandwiching the two sides of the side wall of the cover 63 with the through portion 61. In this state, the bottom surface of the groove 75 is in contact with the surface 61x where the through portion 61 is formed.

[0072] Here, especially as Figure 9 As shown, a gasket positioning portion 63b is formed on the surface of the cover 63, which blocks the upper opening of the main body 62, to position the inner sealing portion 74 of the gasket 7. Specifically, the gasket positioning portion 63b is a slit into which the arc-shaped area of ​​the inner sealing portion 74 is inserted. By forming the sealing positioning portion 63a and the gasket positioning portion 63b on the cover 63, the cover 63 can position the sealing member 64 and the gasket 7.

[0073] With the gasket positioning part 63b embedded in the arc-shaped area of ​​the inner sealing part 74, the flat area of ​​the inner sealing part 74 abuts against the upper surface of the sealing member 64. According to this structure, when the cover 63 blocks the upper opening of the box body 62, the flat area of ​​the inner sealing part 74 is in close contact with the upper surface of the sealing member 64, thus preventing any gaps from forming between the gasket 7 and the sealing member 64.

[0074] <Other Implementation Methods> Furthermore, the present invention is not limited to the embodiments described above.

[0075] In the first and second embodiments described above, the through portion 61 is formed on one of the side wall of the main body 62 and the side wall of the cover 63, but it may also be formed on both.

[0076] In the first and second embodiments described above, the positioning part for positioning the sealing member 64 provided on the upper part is formed on one of the housing body 62 and the cover, but it may also be formed on both.

[0077] In the first and second embodiments described above, the positioning part for positioning the sealing member 64 provided at the lower part is formed on the housing body 62, but it can be formed on one side of the flow path block 2 on which the housing 6 is mounted, or it can be formed on both sides.

[0078] The cover 63 of the first embodiment described above has a connecting wall 63w that connects the abutting surface that abuts against the upper end surface of the housing body 62 and the abutting surface that abuts against the upper surface of the sealing member 64. However, it may also have a structure in which the lower surface of the cover 63 does not have a connecting wall 63w, that is, the abutting surface that abuts against the upper end surface of the housing body 62 and the abutting surface that abuts against the upper surface of the sealing member 64 are coplanar. In this case, the upper surface of the sealing member 64, the upper end of the housing 6, and the cover abutting portion 7a of the gasket 7 are coplanar.

[0079] In the first and second embodiments described above, the main body 62 and the cover 63 are different components, but the main body 62 and the cover 63 can also be integrated.

[0080] In the first and second embodiments described above, the gasket 7 is a component in which the outer sealing portion 73 and the inner sealing portion 74 are connected to each other. However, the gasket 7 can also be divided into two components: an outer gasket element constituting the outer sealing portion 73 and an inner gasket element constituting the inner sealing portion 74.

[0081] In the first embodiment described above, the gasket 7 has a slit 72, but it may also not have a slit 72. In this case, after the cable C is passed through the retaining hole 7h, the cable C is connected to the external extension 4a of the fluid control valve 4 or the connector 5a of the control board 5.

[0082] In the first embodiment described above, the through portion 61 is formed by a notch extending downward from the upper end of the housing body 62, but it is not limited to this. The through portion 61 may also be a through hole extending a predetermined distance from the upper end of the housing body 62.

[0083] In the first embodiment described above, the positioning portion 62a is a recess formed in the housing body 62, but it is not limited to this. For example, a recess may also be formed in the sealing member 64, and the positioning portion 62a may be a protrusion that fits into the recess of the sealing member 64. In this case, in a side view, the sealing member abutment portion 7b may be at the same height as the upper end face of the outer sealing portion 73, or it may be at a different height.

[0084] In the first and second embodiments described above, the housing 6 has a face seal 65, but it may also not have a face seal 65.

[0085] In the first and second embodiments described above, after blocking the gap between the cable C and the through portion 61 by the gasket 7, the cable C can be passed through the through portion 61, and the external protrusion 4a of the fluid control valve 4 can be electrically connected to the connector 5a of the control board 5 by the cable C.

[0086] Furthermore, the present invention can be modified in various ways without departing from its spirit. Industrial applicability

[0087] According to the present invention, when the fluid control valve is located on the outside of the housing, it is possible to prevent dust and water from entering the interior of the housing. Explanation of reference numerals in the attached figures:

[0088] 100: Fluid control device; 2: Flow path block; 3: Fluid sensor; 4: Fluid control valve; 4a: External extension; 5: Control board; 5a: Connector; 6: Housing; 61: Through section; 61x: Surface forming the through section; 62: Housing body; 63: Cover; 64: Sealing component; 65: Surface seal; 7: Gasket; 71: Annular part; 72: Slit; 73: Outer sealing part; 74: Inner sealing part; 7a: Sealing component abutment part; 7h: Retaining hole.

Claims

1. A fluid control device for controlling a fluid flowing in a flow path, wherein, have: A fluid control valve for controlling the fluid; The control board controls the fluid control valve; and The housing contains the control board. The fluid control valve is located on the outside of the housing. The housing has a through-hole for a cable that connects the connector on the control board to the fluid control valve to pass through. The fluid control device is provided with a gasket that blocks the space between the surface forming the through portion in the housing and the cable.

2. The fluid control device according to claim 1, wherein, The housing has: The main body of the box is cylindrical, with at least an opening at the top; A cover that covers the upper opening of the main body of the box; and A sealing component is sandwiched between the main body of the box and the cover.

3. The fluid control device according to claim 2, wherein, The through portion is formed by a notch extending downward from the upper end of the main body of the box and / or upward from the lower end of the cover. The gasket has a sealing member abutment portion, which abuts against the sealing member when the cover covers the upper opening of the main body of the box.

4. The fluid control device according to claim 2 or 3, wherein, The housing has sidewalls that surround the control base plate. The through portion is formed on the side of the sidewall portion opposite to the fluid control valve and / or on the side of the cover body opposite to the fluid control valve.

5. The fluid control device according to claim 4, wherein, The external extension of the fluid control valve is located on the side opposite to the through portion, and the external extension is the part where the cable extends outward from the fluid control valve.

6. The fluid control device according to any one of claims 1 to 5, wherein, The gasket has: An outer sealing portion seals the outer surface of the housing where the through portion is formed; and An inner sealing portion seals the inner surface of the housing where the through portion is formed.

7. The fluid control device according to claim 6, wherein, The outer sealing portion and the inner sealing portion are connected to each other, sandwiching the two sides of the box body on which the through portion is formed.

8. The fluid control device according to any one of claims 1 to 7, wherein, The gasket has: The annular portion, being annular in shape, has a retaining hole extending through it in the thickness direction to hold the cable; and A slit is formed from the outer circumferential surface of the annular portion toward the retaining hole, allowing the cable to be inserted into the retaining hole.

9. The fluid control device according to claim 2 or 3, wherein, The sealing component is frame-shaped along the edge of the opening at the top of the main body of the housing. The positioning part for positioning the sealing component is formed at the opening edge of the upper opening of the main body of the box and / or the cover.

10. The fluid control device according to any one of claims 7 to 9, wherein, A through hole is formed in the cover, extending from the upper surface to the lower surface. The housing also has a face seal that covers the through hole.

11. The fluid control device according to any one of claims 1 to 10, wherein, The fluid control device also includes a flow path block in which the flow path is formed internally. The fluid control valve, the control base plate, and the housing are disposed on one side of the flow path block.

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